Adjustable drilling rig

An adjustable drilling rig is provided for drilling and installation of foundational micropile matrices in difficult to access locations. A platform and separately adjustable legs are provided to level the platform. Arms and a crossbar mount to the legs, and each includes a bushing slidably mounted and moveable there along. A mast is slidably attached to the crossbar bushing through a mounting plate. The mast carries a drill head to which a drill will be attached. Various adjusters are mounted to bushings, mounting plate and other components of the adjustable drilling rig and are independently and selectively activated to adjust the drill head translationally along the X-, Y- and Z-axes and rotationally about the X- and Y-axes to achieve five degrees of freedom in five planes. The entire adjustable drilling rig is provided in two frames for easy transport to remote work sites and may be assembled without complex tools.

FIELD OF THE INVENTION

This invention relates to drill rigs, and more particularly, to drill rigs used for drilling micropile assemblies on uneven terrain.

BACKGROUND

In the geotechnical construction industry, supports and anchors are installed in support of various structures. An example of these supports are micropiles, which anchor the above ground structure to the corresponding bed rock. In particular applications, the location of these anchors may be in remote locations that are difficult to access.

In the oil and gas industry, it is often necessary to drill wells, such as natural gas wells, in remote locations that are difficult to access. These drill sites may frequently be inaccessible by road, having hilly or rocky terrain and uneven ground. The geographic topography of the desired drill site may therefore preclude to prevent the transportation of the necessary drilling equipment to the site by conventional means, such as by truck. Instead, the equipment for these remote drill locations must be alternatively transported to the site, such as by helicopter from a nearby location. The drilling equipment must therefore be sufficiently lightweight that an aircraft can transport it to the remote site. It should also preferably have the ability to level the equipment since the ground or terrain of the drill site is often rugged and not flat. Finally, it should have the ability to drill at an angle, since the ground in such areas is not flat and drill holes may need to be at an angle, such as micropile arrays.

There are some drill rigs that attempt to solve this problem. For instance, U.S. Pat. No. 8,602,123 discloses a drill assembly for use at a difficult to access work site, specifically for the preparation and installation of radial arrays of micropiles. Its various components are flown to the site and the drill assembly is assembled on site. A platform is first positioned on the ground and leveled. A centering ring is then lowered onto and secured to the platform. The centering ring can be adjusted laterally to position the opening therein over the desired target site for drilling. A rotating slide base is then mounted to the centering ring, both axially and radially. This slide base rotates a full 360°. The platform, centering ring, and slide base each define different planes which are parallel to one another. With the components assembled, the drill may be mounted thereto. The assembly has three degrees of freedom, permitting adjustments to the position of the drill: (1) translationally along the X-axis, (2) rotationally about the Y-axis, and (3) rotationally about the Z-axis. These adjustments are used to maneuver the mounted drill to an angular approach to the ground underneath the drill assembly for drilling micropiles according to a designed matrix.

The drill assembly of the '123 Patent has some benefits in that it permits angular drilling at various angles on difficult to access terrain. However, it only provides three degrees of freedom, therefore limiting the adjustments that can be made. It must therefore be repositioned more frequently to reach all the desired locations for drilling. In addition, though its parts are lightweight enough to be flown to and assembled at the difficult to access work site, with the exception of the platform and legs which come pre-attached, it discloses building substantially the entire assembly piece by piece in the field. This requires multiple trips for transporting the various components which is not very efficient. It also requires special tools to attach the centering ring and rotating slide base to securely mount them in a way that permits the translational and rotational adjustment of these component parts, which are mounted sequentially on top of one another in stacked parallel planes. This makes assembly complicated and tedious, particularly because the centering ring must be adjusted in position before being secured in place. It also limits the degrees of freedom for adjustments to the drill position.

There is still a need for a drill rig that can be easily and efficiently transported to a remote or difficult to access work site, and that can be easily assembled in the field. It is also desired to have more degrees of freedom to increase the usefulness and flexibility of such a drill rig.

SUMMARY

An adjustable drill rig is disclosed which addresses these needs. Specifically, the adjustable drill rig of the present invention is provided for drilling and installing foundational micropile matrices in locations with difficult access. The adjustable drill rig is provided in two frames that are sufficiently lightweight they can each be flown to a remote work site, such as by helicopter, thus requiring only two trips for transporting the drill rig. The frames are easily joined in the field without the need for complex tools or specialized knowledge. Notably, the adjustable drill rig provides five (5) degrees of freedom along five different planes with which to adjust the drill head, allowing for drilling at a multitude of angles, such as up to 30° in some embodiments, in any direction and from any starting location within a drill area defined by the platform. Various adjusters are independently and selectively activated to adjust the drill head mounted on a mast translationally along the X-, Y- and Z-axes and rotationally about the X- and Y-axes within the five planes to achieve these five degrees of freedom.

Specifically, a platform is attached to legs that are each independently adjustable to level the platform regardless of the unevenness, grade or incline of the terrain. The platform defines an open drill area therein through which the drill will access the ground for drilling. Arms extend between legs on opposite sides of the platform and a crossbar extends between the two arms. At least one of the arms as well as the crossbar each includes a bushing slidably mounted and movable there along for adjustment along the X-axis and Y-axis. Adjusters for each, which are preferably linear extension motors such as hydraulic motors, extend and contract to direct the translational motion along the X- and Y-axes, respectively. Each of these adjusters directs movement along half of the defined drill area in the relevant direction when mounted in a first position but may be switched to the opposite side of the drill rig easily and quickly by selective mounting points, such as through quick release pins, to access the other half of the defined drill area along the respective axis. This keeps the weight of the drill rig down and further does not require complex or specialized tools or knowledge to reposition the X- and Y-axis adjusters in the field when so desired.

Additional adjusters are also provided for rotation about the X-axis and Y-axis, respectively. These may be linear or rotational motors. They are mounted to the crossbar bushing, to which a drill head is also mounted through a mast and mounting plate. Accordingly, movement of the crossbar bushing similarly moves the position and angle of the drill head where the drill will attach, thus affecting the position, angle and approach of the drill. An additional adjuster is provided for linear translation along the Z-axis, which is mounted to the mast and moves the mast linearly along the Z-axis. The height of the drill head may thus be adjusted to further change the approach of the drill.

The legs and platform form a support frame, and the remainder of the components form a translational frame. Each sub-assembly may be separately transported to the drill site, such as by helicopter. The support frame is positioned first, and the platform is preferably leveled by adjusting each leg independently. The translational frame is then positioned on top of the first, with the arms of the translational frame attaching to the tops of the legs of the support frame. The arms are secured to the legs by a simple connector, such as a clamp that may be screwed or bolted to form the secure connection. In this manner, the entire adjustable drill rig may be easily assembled in the field without the need for special tools or expertise. When the drilling is completed, the adjustable drill rig may be just as easily disassembled by removing the clamps.

The adjustable drill rig, with its particular features and advantages, will become more apparent from the following detailed description and with reference to the appended drawings.

DETAILED DESCRIPTION

As shown in the accompanying drawings, the present invention is directed to an adjustable drill rig10that provides five degrees of freedom in five planes for the selective adjustment of the drill head, each adjustable separately and independently of the other degrees of freedom. This adjustable drill rig10therefore enables drilling at a plurality of angles within a three-dimensional cone under the rig, such as but not limited to up to 30 degrees relative to a vertical reference axis12, which is perpendicular to the platform120of the adjustable drill rig10and preferably is parallel to the force of gravity, as discussed in greater detail below. The adjustable drill rig10may be used with any suitable drill for the purpose of various types of drilling, such as but not limited to drilling and installing foundational micropile matrices. Because of the high degree of selective adjustability, the adjustable drill rig10of the present invention is ideal for drilling at locations with difficult access or uneven terrain which would make the use of other customary drill rigs unsafe, dangerous or inaccessible.

For example, as shown inFIG.1, the adjustable drill rig10of the present invention may be used for subterranean drilling, such as to establish micropiles17which will stabilize building structures as a foundation where surface-level spread foundations are not possible due to geographical limitations, such as but not limited to incline, likely soil erosion and others. Though described in terms of micropile drilling, the present adjustable drill rig10is also capable of drilling other types of subterranean drill holes at an angle relative to the surface of a particular location. The adjustable drill rig10includes a plurality of legs100which are each independently adjustable to accommodate uneven or angled terrain, such as an inclined ground15depicted graphically inFIG.1.

The adjustable drill rig10is also easily assembled in the field, even in difficult to access locations that may not be accessible by road. In such locations, the adjustable drill rig10may be flown in, such as by helicopter or other air transportation, in sub-assemblies. Therefore, the adjustable drill rig10is made of materials and is sized and dimensioned to promote portability and ease of transport. As shown inFIG.2, the adjustable drill rig10includes a support frame20forming the bottom or ground contacting portion of the rig and a translational frame30which attaches to the support frame20for use. The frames20,30are preferably transported separately, with the support frame20being transported to the drill site or location first. The support frame20includes the legs100of the adjustable drill rig10, connected by a platform120. In at least one embodiment, the support frame20is transported to the drill site with the legs100pre-set to approximate the geographical relief and/or terrain of the drill site, such as based on geological survey and/or testing of the drill site conducted as part of assessing the drill site. The legs100may be preset for approximate ground or terrain conditions for safety reasons, so the support frame20is relatively stable when placed.

The support frame20is lowered into position over the desired drill site, with an open drilling area122defined within the platform120positioned over the desired drill site. In at least one embodiment, as shown here, the platform120may be sized to accommodate a drilling area122measuring approximately 5 feet by 5 feet, although other sizes and shapes of the drilling area122and platform120are also contemplated herein. Adjustments to each leg100may be made as needed once in place, to fine tune the positioning of the support frame and preferably level the platform120, as discussed below, despite the terrain. Once in place, the translational frame30may be flown in and lowered onto the translational frame20. Chains may connect to transportation points145on the translational frame to enable the transportation of the translational frame30, which may be removed once the translational frame30is in place. The translational frame30includes a first arm130, second arm140, a crossbar150extending therebetween, a mast200vertically mounted to the crossbar150through a mounting plate210, and a drill head220. It is the various components of the translational frame30that provide the five degrees of freedom for the drill head, and therefore, for the drill.

The first and second arms130,140connect to the legs100to attach the translational frame30to the support frame20. Arm connectors131,141may be used to connect the arms130,140to the legs100. For instance, first arm connectors131a,131bmay be used to connect the first arm130to legs100a,100band second arm connectors141a,141bmay be used to connect the second arm140to legs100c,100d. Each of the arm connectors131,141may include a first portion132,142secured to the corresponding leg100and a second portion133,143selectively movable relative to and/or removable from the corresponding first portion132,142. For instance, in at least one embodiment as shown inFIG.2, the second portion133,143may be fully separable from the corresponding first portion132,142. In other embodiments, the second portion133,143may be at least partially secured to and movable relative to the corresponding first portion132,142, such as about a hinge providing clam-shell action movement for opening and closing the second portions133,143relative to the first portions132,142. Accordingly, the first and second arm connectors131,141may be clamps, brackets, or other similar connecting structures.

The first and second portions132,133of each of the first arm connectors131a,131bcollectively at least partially surround the first arm130to secure the first arm130to legs100a,100b, as shown in the exploded view ofFIG.2. Securing members such as but not limited to screws and bolts, hold the first and second portions132,133together with the first arm130secured therebetween. Similarly, the first and second portions142,143of each of the second arm connectors141a,141bcollectively surround at least a portion of the second arm140to secure the second arm140to legs100c,100d, as shown inFIG.2. Securing members hold the first and second portions142,143together with the second arm140secured therebetween. These securing members provide a firm and secure connection but are preferably reversible, allowing the first and second arms130,140to be released when desired to allow for disassembly of the adjustable drilling rig10into the respective frames20,30for transport from the drill site once the drilling is complete.

Once the translational frame30is secured to the support frame20, the adjustable drill rig10is fully assembled, as shown inFIGS.3and4A. For instance,FIG.3shows the assembled adjustable drill rig10from a front perspective view, which shows the drill head220and mast200. The drill head220is sized and configured to receive a drill (not shown) thereon. It is shown here is a representative drill head220since its actual configuration may vary depending on the type of drill to be used. The mast200is used to mount the drill head220to the rest of the adjustable drill rig10and convey the adjustments in position to the drill head220, and therefore, to the drill.

The adjustable drill rig10includes various adjusters to effectuate the selective adjustment of the position and angle of the drill head220, and therefore drill, with five degrees of freedom, both linearly along the X-, Y- and Z-axes and rotationally about the X- and Y-axes. As used herein, the “X-axis” or “X-axis direction” is defined as parallel to the length of the crossbar150of the translational frame30; the “Y-axis” or “Y-axis direction” is defined as parallel to the length of the first and second arms130,140of the translational frame30; and the “Z-axis” or “Z-axis direction” is defined as perpendicular to the surface of the platform120of the support frame20. These axes are also labeled inFIGS.4A-4E. The adjusters are shown in the rear perspective view of the assembled adjustable drill rig10ofFIG.4A. Specifically, the adjustable drill rig10includes a Y-translational adjuster160which is operable to move the drill head220linearly along the Y-axis; an X-translational adjuster165operable to move the drill head220linearly along the X-axis; an X-rotational adjuster170operable to move the drill head220rotationally about the X-axis; a Y-rotational adjuster180operable to move the drill head220rotationally about the Y-axis; and a Z-translational adjuster190operable to move the drill head220linearly along the Z-axis. With these five adjusters, each separately and independently operable as described below, the drill head220may be adjusted to any position along the arms130,140and crossbar150, and to a variety of angles relative to the reference axis12, such as but not limited to angles of up to 30 degrees. Other angles, including greater angles, are also contemplated and within the spirit of this adjustable drill rig10and may in some instances bring the drill head220outside the perimeter of the support frame20, so long as the drill may still access the drilling area122. In addition, it should be appreciated that the adjusters move various parts of the frames20,30, such as the legs100and crossbar150, as well as the mast200to position the drill head220at any location within boundaries of the support frame20. With the translational movements and rotational movements the various adjusters collectively provide, the drill mounted on the drill head220may reach any point in the ground within a three-dimensional cone300under the drilling area122defined within the platform120, as shown inFIG.4A, allowing holes for micropiles to be drilled at a wide variety of angles, positions and trajectories. Thus, an entire micropile matrix can be drilled, even at angles on uneven or inaccessible terrain, using this single adjustable drill rig10without having to relocate the drilling rig10.

The leg adjusters114of the support frame20are primarily to accommodate the terrain and geography of the drill site and to level the platform120. However, the leg adjusters114may also be used to increase the overall height of the adjustable drill rig10, providing additional linear translational adjustment along the Z-axis such as may be needed to achieve even greater drill angles.

The various adjusters114,160,165,170,180,190selectively move the support frame20, translational frame30and/or mast200along various planes coincident with the X-, Y- and Z-axes. For instance, the legs100are selectively adjustable to move the support frame20in the Z-axis direction along a first plane310or second plane320, as shown inFIG.4B. First and second planes310,320are each defined between different legs100of the support frame20. For instance, the first plane310may be defined between the legs100a,100bthat support the first arm130. The second plane320may be defined between the legs100c,100dthat support the second arm140. The first and second planes310,320also extend in the Z-axis direction, as shown inFIG.4B.

In addition, at least a portion of the translational frame30is selectively movable in the X- and Y-axis directions along a third plane330, as shown inFIG.4C. The third plane330may be defined as the plane that extends along the collective surface of the first arm130, second arm140and crossbar150, and which is perpendicular to the first and second planes310,320. Accordingly, the third plane330extends in both the X- and Y-axes. The crossbar150is movable along the third plane330in the Y-axis direction. The mast200also moves along with the crossbar150, being attached thereto by the mounting plate210. Additionally, a crossbar bushing156, discussed in greater detail below, is movably mounted to the crossbar150and is selectively movable along the third plane330in the X-axis direction.

The mast200is slidably mounted to the mounting plate210, and therefore to the translational frame30. It is selectively movable translationally along a fourth plane340as shown inFIG.4D. The fourth plane340is defined as extending the length of the mast200and intersecting the third plane330. Accordingly, the mast200may move translationally along the fourth plane340in the Z-axis direction as it slides in relation to the mounting plate210when the Z-translational adjuster190is activated, and in the X-axis direction as the crossbar bushing156moves along the crossbar150and the X-axis when the X-translational adjuster165is activated. The mast200also moves rotationally within the fourth plane340by movement of the Y-rotational adjuster180to adjust the angle of the mast200relative to the reference angle12within the fourth plane340.

The mast200is additionally movable within a fifth plane350as shown inFIG.4E. The fifth plane350is defined as extending the length of the mast200and intersecting each of the third and fourth planes330,340. The fifth plane350exists between the first and second planes310,320and may be parallel to the first and second planes310,320when the mast200is aligned with the reference axis12, or may not be parallel to the first and second planes310,320when the mast200deviates from the reference axis12. The mast200is selectively movable rotationally within the fifth plane350about the X-axis by movement of the X-rotational adjuster170.

The various adjusters114,160,165,170,180,190may be linear or rotational in nature, and may be electronically, hydraulically, pneumatically or even manually operated, or combinations thereof throughout the adjustable drill rig10. For instance, in at least one embodiment as shown inFIG.4, the leg adjusters114, Y-translational adjuster160, X-translational adjuster165, X-rotational adjuster170and Z-translational adjuster190may be shocks which are hydraulically operated and move by linear extension of a piston within a barrel. The Y-rotational adjuster180, and in some embodiments the X-rotational adjuster170, may be a rotary motor that is electrically driven, as described below. However, other combinations are also possible. Some or all of the various adjusters114,160,165,170,180,190may be powered by a power unit (not shown) that is separate from the adjustable drilling rig10but in electronic, hydraulic or pneumatic communication with the relevant adjusters114,160,165,170,180,190. In at least one embodiment, the power unit may be an engine, such as but not limited to a gas or diesel engine, which may have any number of cylinders such as but not limited to 4, 6 or 8. In at least one embodiment, the power unit is a 4-cylinder diesel engine capable of providing 120-150 horsepower, and 150 horsepower in at least one embodiment. The power unit may connect to the adjustable drill rig10through electrical, electronic, hydraulic and/or pneumatic lines, such as cables or wires (not shown), to transmit electricity, fluid and/or gas, respectively, to the adjustable drill rig10. In some embodiments, these lines or cables connect directly to each of the various adjusters114,160,165,170,180,190. In at least one embodiment, however, the cables or wires from the power unit connect to a manifold mounted in the adjustable drill rig10, such as to the platform120or a leg100. The manifold is in communication with each of the adjusters114,160,165,170,180,190to provide electrical, hydraulic and/or pneumatic power as the particular adjuster114,160,165,170,180,190requires. The various adjusters114,160,165,170,180,190are moved according to operative instructions received from a control unit (not shown) which is separate from the adjustable drill rig10but in electronic communication with each of the adjusters114,160,165,170,180,190either directly or through a connection to the manifold. Each of the adjusters will now be described in greater detail.

FIG.5shows more detailed view of the support frame20, specifically the plurality of legs100movably attached to a platform120. Each leg100a,100b,100c,100dis separately and independently moveable in relation to the others, to accommodate any terrain or ground incline and to level the attached platform120despite the angle, incline or unevenness of the terrain. Each leg100includes a first portion110and second portion112collectively making up the length of the leg100, shown with respect to leg100afor illustrative purposes though all legs100include respective first and second portions110,112. The first and second leg portions110,112of each leg may be made of strong but light materials such as but not limited to steel or aluminum. The first portion110of each leg100is located at the top of the support frame20. In at least one embodiment, one end of the first portion110of the leg100terminates in part of an arm connector131,141, such as the first portion132,142of the arm connector as described above. The other end of the first portion110of the leg100terminates in abutting contact or overlapping with the second portion112of the leg100when fully collapsed. Accordingly, the adjacent ends of the first and second portions110,112of each leg100may have a corresponding shape and/or dimension to facilitate flush seating of the first portion110of the leg100on the second portion112thereof when the leg100is fully collapsed.

The second portion112extends between the end meeting the first portion110and a foot113at the opposite end. The foot113is configured and dimensioned to be placed on the ground or terrain and to support the leg100and rest of the adjustable drill rig10. Accordingly, in at least one embodiment the width of the foot113is at least as large as the width of the corresponding leg100. As shown inFIG.5, the foot113may have a larger width than the leg100and may have a planar configuration to distribute the weight of the adjustable drilling rig10. In other embodiments (not shown), the foot113may have a smaller width than the corresponding leg100, such as if the leg100and/or foot113tapers to a narrower width such that the portion of the foot113contacting the ground or terrain is smaller or narrower than the leg110. Indeed, in some such embodiments, the foot113may come to a point or substantially to a point where it contacts the ground. Such narrower dimensions would allow the foot113to contact the ground despite uneven terrain lacking large areas for wider or flatter footholds, such as rocky or irregular terrain, brush or roots extending through the ground surface.

Each leg100includes a leg adjuster114attached to the leg100that is movable relative to the leg100to similarly move the leg100in the Z-axis direction. For instance, the leg adjuster114may include a first attachment point116where the leg adjuster114attaches to the first portion110of the leg100, and a second attachment point117where the leg adjuster144attaches to the second portion112of the leg100, as shown inFIG.5, though in other embodiments, the first and second attachment points116,117may connect to other portion112,110of the leg100. Accordingly, the leg adjuster114is attached to the leg100so it spans between the first and second portions110,112of the leg100. The leg adjuster114may therefore have an elongate configuration and may extend along at least a portion of the length of the leg100in proximity to the junction of the first and second portions110,112. The attachment points116,117may be located anywhere along the leg adjuster114, though they may preferably be located at or near the terminal ends of the leg adjuster, as shown inFIG.5. The attachment points116,117coordinate with matching attachments on the leg100to connect to the first and second leg portions110,112. For instance, the attachment points116,117and coordinating attachments on the leg100may be brackets, pin connectors, clamps, screws, bolts, or other similar structure for secure attachment. In at least one embodiment, the attachment points116,117may be screwed or bolted to the corresponding leg portions110,112.

Each leg adjuster114linearly extends and contracts when activated, producing linear translational movement of the attached leg100along the Z-axis and the first or second plane310,320. Because one part of the leg adjuster114is secured to the first portion110of the leg100and another part of the same leg adjuster114is secured to the second portion112, when the leg adjuster114extends or contracts, it moves at least one of the first and second portions110,112with it. In at least one embodiment, shown inFIG.5, the first portion110is moved linearly, either extending upward (away from the second portion112and foot113) or contracted downward (toward the second portion112and foot113) when the leg adjuster114is activated, and follows the direction of movement of the leg adjuster114. This movement increases or decreases the distance between the first and second portions110,112and therefore the overall length of the leg100and thus height of the support frame20.

In some embodiments, at least one of the first and second portions110,112of the leg100may be hollow, and the other portion of the leg100may telescope within the hollow interior of the first or second portion110,112of the leg. This inner telescoping leg portion provides structural stability to the leg100and keeps the leg100aligned when the first and second leg portions110,112are linearly translated relative to one another by the leg adjuster114. In such embodiments, the hollow interior of the first and/or second leg portions110,112has a larger dimension than the telescoping inner portion, such that the inner portion is retained within the hollow of the leg100. Either the outer hollow portion or inner telescoping portion may be movable relative to the other, such as by slidable movement during linear translation. In at least one embodiment, the inner telescoping portion remains stationary when the hollow outer portion of the leg100is moved by the leg adjuster114.

As mentioned previously, each leg adjuster114may be a hydraulic, pneumatic or electronic motor, and may be the same or different types from one another. In the embodiment shown inFIG.5, the leg adjusters114are hydraulics comprised of a piston118and cylinder119. For instance, in at least one embodiment the cylinder119may have a diameter in the range of 3-4 inches, preferably about 3 inches. The length of the cylinder119will depend on the height needed for the rig10based on the specifications of the drill site location and/or size and configuration of micropile array to be drilled. The cylinder119preferably has a fixed length and a travel distance is provided for the leg adjuster114by the movement of the piston118. For instance, in some embodiments, the cylinder119may have a length of up to or about 20 inches, with a travel distance of the leg adjuster114being up to about 8-10 inches. In this example, the leg adjuster114therefore may have a length of up to 30 inches fully extended and 12 inches fully compressed. In other embodiments, however, each leg adjuster114may have a travel length of up to 24 inches and a cylinder119length up to 48 inches, thus leading to a possible 72 inches maximum extension and 24 inches maximum compression. These are but a few non-limiting examples. The leg adjuster114may have suitable power capacity and operability for the size and weight of the rig10. For instance, in at least one embodiment, each leg adjuster114may be a hydraulic having up to 3000 psi capacity and operative in the range of about 500-1000 psi, though other ranges are also possible. When activated, the pressurized hydraulic fluid moves the piston118within and relative to the cylinder119. Depending on the direction of hydraulic fluid flow as directed by the hydraulic pump, the piston118may move further out of the cylinder119to increase or extend the length of the leg adjuster114, or further into the cylinder119to decrease or contract the length of the leg adjuster114. The length of the leg100is similarly increased (extended) or decreased (contracted) consistent with the movement of the piston118relative to the cylinder119.

As mentioned previously, each of the legs100may be adjusted separately and independently of one another by selectively activating the desired corresponding leg adjuster114. Accordingly, each leg100may be adjusted to a different length than the remaining legs100, such as shown for legs100a,100cand100dinFIG.5, and some legs100may have the same length as others, such as legs100band100cinFIG.5while still others have differing lengths. The leg adjusters114may be operated one at a time or simultaneously in any combination and by any amount to change the length of the legs100and correspondingly level the platform120. In some embodiments, “level” may mean the platform120is parallel to the surface of the ground directly underneath the platform120. In other embodiments, “level” may mean perpendicular to the direction of gravitational force, regardless of the slope or incline of the ground or terrain. The platform120may be leveled on various inclines, such as but not limited to inclines of up to 24°. As seen inFIG.5, the platform120is secured to the first portion110of each of the legs100, such as but not limited to by welding, screws and bolts. Accordingly, as the distance between the first and second portions110,112of the legs100is adjusted, the platform120rises and falls with the first portion110of the legs100. Each leg100may be adjusted independently of the others to achieve the desired level of the platform120. The leg adjusters114may be operated simultaneously or one at a time to accomplish this adjustment and leveling.

The adjustable drill rig10also includes at least one Y-translational adjuster160, as shown inFIG.6. The Y-translational adjuster160, like the other adjusters discussed herein, may be a hydraulic, pneumatic, electronic or manually operated motor. In the embodiment shown inFIG.6, the Y-translational adjuster160is a hydraulic motor, which may be similar to that discussed above. It may be composed of a cylinder and piston, with the cylinder having a diameter in the range of about 3-4 inches, preferably about 3 inches in at least one embodiment. The Y-translational adjuster160may have a travel distance of up to about 8-10 inches. It may also have a power capacity of up to about 3000 psi and may be operable in the range of about 500-1000 psi, though other ranges are also possible. The Y-translational adjuster160includes a first mounting point162at one end and a second mounting point163at the opposite end. These first and second mounting points162,163may be located at terminal ends of the Y-translational adjuster160, such as at a terminal end of the cylinder and a terminal end of the piston. The first and second mounting points162,163may be mounting hardware for secure attachment, such as brackets and screws. In at least one embodiment, the first and second mounting points162,163are brackets within which quick-release mounting hardware, such as a quick release pin, trailer hair pin, cotter pin is inserted to secure the connection, but which can easily be removed without the use of tools when connection is no longer desired.

The first mounting point162attaches the Y-translational adjuster160to a leg100, specifically to a point along the first portion110of a leg100. The first mounting point162may be located at any point along the first portion110of a leg100and to any of the legs100. The second mounting point163connects to the first arm130, preferably at a first arm bushing152. The first arm bushing152includes a portion that at least partially surrounds the first arm130and another portion which may extend therefrom and receives one end of the crossbar150, as shown inFIG.7. In at least one embodiment, at least a portion of the first arm bushing152entirely surrounds the first arm130and is movable there along, such as by sliding. Accordingly, the first arm bushing152may have a shape and size similar to the diameter and outer circumference of the first arm130but is slightly larger than the outer circumference of the first arm130to allow clearance for smooth movement of the first arm bushing152along the arm130. For instance, the first arm130may have an inner diameter in the range of about 2-3 inches, preferably about 2 inches, and an outer diameter in the range of about 3-4 inches, preferably about 3 inches in at least one embodiment. The inner diameter may be as large as possible while still giving the desired strength for the first arm130, which will depend on the type of material used and its strength characteristics. The inner and outer diameters may also depend on the wall thickness of the first arm130, which may be in the range of about 0.25-1 inch, and preferably about 0.5 inch in at least one embodiment. The thickness of the wall will depend on the material used for the first arm130, with stronger materials allowing for thinner wall thickness. For instance, the first arm130may be made of 4130 chromoly steel, stainless steel, or other steels and/or metals. The first arm130may include a coating or be nickel-, chrome- or nitrile-plated on the outer surface of the first arm130to improve durability and quality. In some embodiments, the first arm130may have a high-quality surface finish, such as to reduce surface roughness and improve the ability of coatings to adhere to the material, the degree of which will depend on the material of the arm130and the particular coating or plating to be used. Once the coating or plating is applied, the outer surface of the first arm130may have an essentially immeasurable surface roughness. The first arm bushing152which translates over the first arm130may be made of durable metals having high yield strength, such as but not limited to 2024 aluminum or other types of aluminum on the outside, and brass, bronze or other metal alloy on the inside. In some embodiments, the outer surface of the first arm130may be lubricated, coated or impregnated with grease, such as industrial or automotive grease, or polytetrafluoroethylene (“PFTE”) or other polymers or similar chemicals for improved mobility and durability while reducing wear on the arm130. For example, in one embodiment, PFTE may be used in conjunction with a first arm130made of steel. Grease of either type may be used with first arm bushings152having brass or bronze inner surfaces. Grease may not be needed if PFTE is included in or on the outer surface of the first arm130. These are a few non-limiting examples.

Returning toFIG.6, with one end secured to leg100band the other end secured to the first arm bushing152, the Y-translational adjuster160may be selectively activated to extend or contract in length, such as described above for the leg adjuster114and indicated by the arrow inFIG.6. The Y-translational adjuster160may extend and contract according to its travel distance, which may be up to 24-48 inches in some embodiments, preferably up to about 24 inches in at least one embodiment. As the Y-translational adjuster160is extended, its overall length increases. This pushes on the first arm bushing152in one direction, thereby moving the first arm bushing152along the first arm130along the Y-axis accordingly. As the first arm bushing152translates linearly in the Y-axis, it moves the crossbar150in the same direction along the Y-axis. Though described here and shown inFIG.6as being attached to the first arm bushing152of the first arm130, the Y-translational adjuster160may just as easily be secured by its second mounting point163to a second arm bushing154located on the second arm140and by its first mounting point162to one of the legs100c,100d. The second arm140and second arm bushing154are as described above for the first arm130and first arm bushing152. In some embodiments, it may be desired to have two Y-translational adjusters160, each attached to one of the first and second arm bushings152,154. In such embodiments, the Y-translational adjusters160may be operated simultaneously to coordinate the extension or contraction of the Y-translational adjusters160and therefore of the linear movement of the crossbar150along the Y-axis.

As can be appreciated fromFIG.6, the Y-translational adjuster160can only extend or contract as limited by its length and its total travel distance. Therefore, the movement of the arm bushing152,154and crossbar150along the Y-axis is restricted from the area where the Y-translational adjuster160resides, to about 50% of the total Y dimension of the drilling area122. This means that translational movement along the Y-axis would be limited. However, the Y-translational adjuster160is also selectively configurable to attach to a different leg100, providing translational movement along the Y-axis in the opposite direction to access a different part of the drilling area122. For instance, as depicted inFIG.6, the first mounting point162of the Y-translational adjuster160may be released from attachment at the leg100b, such as by removing a quick release pin holding the Y-translational adjuster160in place. The Y-translational adjuster160may then be swung about the second mounting point163, where it remains attached, to now attach the first mounting point162to a different leg100a. This position is shown in dotted lines inFIG.6. When in this position, the arm bushing152and crossbar150may now be translated along the Y-axis in the opposite direction from its previous location. This allows the remainder of the drilling area122to be accessed, so the entire drilling area122along the Y-axis is accessible. Notably, this adjustment can be made quickly and easily in the field, as needed, without the need for tools and while still allowing full flexibility. It also keeps the weight of the overall adjustable drilling rig10down, which also allows for easier transportability, particularly where aerial transport to the location is required.

Turning now toFIG.7, the crossbar150of the adjustable drilling rig10extends between the first and second arms130,140. Specifically, one end of the crossbar150is received within a portion of the first arm bushing152and the opposite end of the crossbar150is received within the second arm bushing154. The crossbar150may be made of the same material and high surface finish as the first and second arms140discussed above. The crossbar150includes a crossbar bushing156located on the crossbar150between the first and second arm bushings152,154. At least a portion of the crossbar bushing156at least partially surrounds the crossbar150, such as having a larger inner diameter than the outer circumference of the crossbar150. This provides clearance so the crossbar bushing156can move along the crossbar150, such as by sliding linear translation.

An X-translational adjuster165is located on the crossbar150to drive the linear movement of the crossbar bushing156along the crossbar150along the X-axis. As with the other adjusters, the X-translational adjuster165may be a hydraulic, pneumatic, electronic or manual motor, though is preferably a hydraulic motor. In at least one embodiment, it may have a travel distance that is half that of the Y-translational adjuster160, such as up to about 12-24 inches. As with the previous adjusters, the X-translational adjuster165may have a power capacity of up to about 3000 psi and an operative capacity of about 500-1000 psi, though other ranges are also possible. As shown inFIG.7, the X-translational adjuster165includes a first mounting point168at one end and a second mounting point169at the opposite end. Preferably, the first and second mounting points168,169are located at terminal ends of the X-translational adjuster165, such as on the piston and cylinder thereof in a hydraulic. The first mounting point168is secured to an arm bushing, such as the first arm bushing152as shown inFIG.7. The second mounting point168is secured to the crossbar bushing156. When the X-translational adjuster165is activated, it extends or contracts, moving the crossbar bushing156along the crossbar150in a linear translational motion along the X-axis. As with the Y-translational adjuster160, the translational movement provided by the X-translational adjuster165is also limited by its length. When in place, the X-translational adjuster165permits linear translation along the X-axis for a portion of the drilling area122, such as about 50% thereof. However, it is also selectively configurable to access the other part of the drilling area122. To accomplish this, the first mounting point168of the X-translational adjuster165is released from the arm bushing, such as the first arm bushing152by removing a quick release pin as described previously. The second mounting point169of the X-translational adjuster165is released from the crossbar bushing156, which may also occur by removing a quick release pin. The X-translational adjuster165is then positioned along the other side of the crossbar150in the opposite orientation, and the first mounting point168is secured to the other arm bushing, such as the second arm bushing154, and the second mounting point169is secured to the crossbar bushing156at a different bracket or connection point. Accordingly, the crossbar bushing156may have a plurality of connection brackets for adjusters. This new position of the X-translational adjuster165is shown in the dotted lines inFIG.7. In this position, the crossbar bushing156can be linearly translated along the X-axis on the other side of the crossbar150, allowing the other half of the drilling area122to be accessed. This also aids in the full flexibility of the adjustable drill rig10without requiring tools to adjust and minimizing weight for transportability.

The crossbar150may preferably have non-cylindrical cross-section. For instance, in at least one embodiment as shown inFIG.8, the crossbar150may have at least one flat edge151that provides a keyed configuration. The opening in the crossbar bushing156through which the crossbar150passes is preferably similarly keyed with a corresponding flat edge to match the flat edge151of the crossbar150. This keyed or mated flat edge151prevents the crossbar bushing156from rotating about the crossbar150as it translates linearly there along. In other embodiments, the crossbar150may have a cylindrical cross-section. In such embodiments, the crossbar150may be secured within the arm bushings152,154, such as with screws, clamps, adhesives, welding or other similar securing mechanisms, or may be frictionally fit within the arm bushings152,154to provide a snug fit and prevent slipping or rotation of the crossbar150within the arm bushings152,154. The crossbar bushing156may therefore have a tighter clearance with the crossbar150to prevent rotation during linear translation.

The adjustable drill rig10also includes an X-rotational adjuster170, such as shown inFIGS.9and10, that rotates the mast200and drill head220about the X-axis. In at least one embodiment the X-rotational adjuster170may provide rotation forward or rearward about the X-axis relative to the reference axis12, such as but not limited to up to 30° though other angles are also possible. In the embodiment shown inFIGS.9and10, being a linear adjuster, the length of the X-rotational adjuster170dictates the amount of rotation possible about the X-axis. For instance, in at least one embodiment the X-rotational adjuster170may have a linear travel distance of up to about 8-10 inches, providing rotation about the X-axis of up to 30° to either side of the reference axis12. The X-rotational adjuster170may be a rotational or linear adjuster, though in the embodiment inFIGS.9and10the X-rotational adjuster170is a linear adjuster. In other embodiments in which it is a rotational adjuster, it may be as described below for the Y-rotational adjuster180and may be capable of rotation around a full 360°, preferably providing operative rotation of up to 60° from the reference axis12in some embodiments, and up to about 30° from the reference axis12in other embodiments. The X-rotational adjuster170may be a hydraulic, pneumatic, electric or manual motor as the other adjusters discussed above. In at least one embodiment, it is a linear hydraulic motor having a cylinder and piston, such as with a travel distance of up to about 8-10 inches and a power capacity of up to about 3000 psi. In at least one embodiment, the X-rotational adjuster170may operate in the range of about 2000-2500 psi since it must support the weight of the mast200and drill when rotated at an angle, thus requiring more power than the adjusters discussed previously. Other operative pressures are also contemplated and possible.

As shown inFIGS.9and10, the X-rotational adjuster170includes a first mounting point172at one end and a second mounting point173at an opposite end. In some embodiments, the first and second mounting points172,173may be brackets enabling quick release, such as discussed above in connection with the previous adjusters. In other embodiments, the first and second mounting points172,173may be fixedly secured to their corresponding attachment structures. The first mounting point172secures to the crossbar bushing156. In some embodiments, as shown inFIG.10, the crossbar bushing156may have an extension158projecting laterally from the crossbar150. This extension158is long enough to accommodate the length of the X-rotational adjuster170, as one end of the X-rotational adjuster170is mounted thereto. In at least one embodiment, as shown inFIG.10, the first mounting point172is located at a terminal end of the X-rotational adjuster170and connects to a bracket at a terminal end of the extension158of the crossbar bushing156. The second mounting point173at the opposite end of the X-rotational adjuster170interconnects to the mast200, such as through the mounting plate210. In at least one embodiment, as seen inFIG.10, the second mounting point173of the X-rotational adjuster170connects to a bracket on the drum184of a Y-rotational adjuster180, described below, which itself is mounted to the mounting plate210. In other embodiments, the second mounting point173of the X-rotational adjuster170may connect directly to the mounting plate210on the mast200, or to the mast200itself.

When the X-rotational adjuster170is activated, it extends or contracts according to the direction provided during activation. As it extends or contracts, it causes the mast200to pivot about pivot point176, as shown inFIGS.9and10. The pivot point176is the connection point between the mast200and the crossbar bushing156. For instance, in the embodiment shown inFIG.10, the pivot point176is the point at which the drum184of a Y-rotational adjuster180attaches to the crossbar bushing156. The mast200in turn connects to the other side of this drum. In other embodiments, the pivot point176may be at a point connecting the crossbar bushing156directly to the mounting plate210or directly to the mast200, depending on where the connection to the crossbar bushing156is made.

The adjustable drilling rig10also includes a Y-rotational adjuster180, shown inFIGS.11and12, capable of rotating the mast200and drill head220about the Y-axis by a full 360°. In at least one embodiment as depicted inFIG.11, the Y-rotational adjuster180provides rotation about the Y-axis of up to about 60° to either side of the reference axis12, and preferably up to about 30° to either side of the reference axis12, though other angles are also contemplated depending on the requirements of the drill site and the adjustable drill rig10. Preferably, the Y-rotational adjuster180and X-rotational adjuster170may operatively provide the same amount or degree of maximum rotation of the mast200relative to the reference axis12to achieve a radial cone300for drilling, as shown inFIG.4A, even if the same angle is not used for each in practice. The Y-rotational adjuster180may be a rotational or linear adjuster, though in the embodiment inFIGS.11and12the Y-rotational adjuster180is a rotational motor. For instance, the Y-rotational adjuster180may be a ring and pinion type rotational motor and may be hydraulically, pneumatically, electrically or manually driven. Preferably, it is hydraulically driven as are the other adjusters. In at least one embodiment, the Y-rotational adjuster180may have a shaft in the range of about 0.5-2 inches, preferably about 1.75 inches, with inlet pressure of up to 2500 psi (for driving capabilities) and a back pressure of up to 1000 psi (for holding capabilities), though other pressures are also contemplated. Examples include but are not limited to the heavy-duty hydraulic motor made by Prince, although similar hydraulic motors by other manufacturers such as McMaster and others are also possible. In other embodiments, the Y-rotational adjuster180may be a rotational hydraulic motor, such as but not limited to a gear motor or vane motor.

As shown inFIG.12, the Y-rotational adjuster180includes a pinion183of gear teeth movably retained within a drum184that is connected to the mast200. A ring gear182connects to the shaft from a motor185of the Y-rotational adjuster180at one end, and the teeth of the ring gear182interdigitate with the gear teeth of the pinion183at the opposite end. The sizes of the ring182and pinion183will depend on the size and weight of the mast200, the rotational requirements for it, and the rig10overall. In at least one embodiment, the ring182may have an outer diameter of about 3-4 inches and the pinion183may have an outer diameter of about 12-14 inches. When the motor185, such as a hydraulic or electric motor, is activated, it rotates a shaft187, which extends into the ring182and causes the ring182therewith to rotate. As the toothed outer terminal end of the ring182rotates, it engages the gear teeth on the inner surface of the pinion183and pulls or pushes the pinion183circumferentially about within the drum184, either in a clockwise or counterclockwise direction depending on the rotation of the motor185and ring182. At least one linkage extends between and securely connects the drum184of the Y-rotational adjuster180to the mounting plate210(as shown inFIGS.11and12) or to the mast200directly. The linkage(s) may be made of the same material as the ring182, pinion183or other component of the Y-rotational adjuster180, such as but not limited to steel, stainless steel and aluminum. In some embodiments, the linkage(s) may be screws, bolts, or other elongate connecting hardware. In other embodiments, the linkage(s) may be rods or even points where the drum184and the mounting plate210or mast200are permanently affixed, such as but not limited to through welding. Thus, as the pinion183rotates about the Y-axis within the drum184, driven by the motor185, so does the mounting plate210and mast200similarly rotate about the Y-axis.

The mast200of the adjustable drill rig10is an elongate structure to which the drill head220is attached. The drill will, in turn, mount to the drill head220so positioning of the drill head220as described herein by the various adjusters results in positioning of the drill once mounted. The mast200therefore must support the weight of the drill. The mast200may be made of steel, stainless steel, aluminum, or other high strength but lightweight metals, metal alloys or other material. The mast200has an elongate length that extends in the direction of the Z-axis. In at least one embodiment, it may have a length of up to 8-10 feet, though other lengths are also contemplated and may depend on the specification or requirements of the drill site, desired micropile array configuration and/or depth, and weight of the drill to be attached, among other considerations. The mast200may include at least one track202along at least a portion of its length. In the embodiments shown inFIGS.13and14, the mast200includes two tracks202, one on each lateral side of the mast200. Each track202may include a series of apertures204and grooves206which may be used to mount the drill head220to the mast200.

The mast200connects to the rest of the assembly through the crossbar bushing156so that it moves linearly along the X-axis relative to the crossbar150with the movement of the X-translational adjuster165, rotationally about the X-axis with the movement of the X-rotational adjuster170, and rotationally about the Y-axis with the movement of the Y-rotational adjuster180. In at least one embodiment the adjustable drill rig10includes a mounting plate210that is slidably affixed to the mast200, as shown inFIGS.13and14. The mast200may connect to the crossbar bushing156through connection to the mounting plate210. For instance, as explained above, the crossbar bushing156may pivotally connect to the Y-rotational adjuster180at pivot point176, and the Y-rotational adjuster180may in turn connect to the mounting plate210at the ring182thereof. In some embodiments, the crossbar bushing156may connect directly to the mounting plate210.

The mounting plate210may have any shape and preferably has a planar body defined between a first surface21, shown inFIG.13, and an opposite second surface212, shown inFIG.14. The first surface211is positioned nearest to, and facing, the crossbar bushing156and is the surface to which the Y-rotational adjuster180mounts. The first surface211may be accessible from the rear of the adjustable drill rig10. Here, the term “rear” may refer to the side of the rig10opposite from the drill head220, which may be referred to as the “front” of the rig10. The first surface211of the mounting plate210is preferably planar and receives the Y-rotational adjuster180(such as a portion connecting to the ring182) thereon. It may also receive the second mounting point173of the X-rotational adjuster170in some embodiments (not shown). The second surface212is opposite the first surface211and faces and/or slidingly abuts the mast200.

The mounting plate210also includes at least one, though preferably a plurality of lips214a,214bthat extend from the planar body of the mounting plate210in the direction away from the crossbar bushing156and toward the front of the rig10. In at least one embodiment, the mounting plate210includes two lips214a,214b, each one extending from a different peripheral edge of the mounting plate210, preferably the lateral sides of the mounting plate as inFIG.14. Though only lip214ais shown inFIG.14, it should be appreciated that a similar lip214bexists on the other lateral side of the mounting plate210and engages the other side of the mast200. The lips214a,214bextending along at least a portion of the depth of the mast200sufficient to wrap around at least a portion of the mast200to slidably attach the mounting plate210thereto. For instance, as shown inFIG.14, each of the lips214a,214bextend far enough to wrap around and engage a groove206at the rear of the mast200, such as may be defined by a track202on the mast200. Each side of the mast may have a track202, or the track202may extend through the mast200. The lips214a,214bof the mounting plate210are therefore at least as long as the depth of the rear surface, groove206or track202of the mast200. In some embodiments, the lips214a,214bmay be substantially the same length as the depth of the mast200.

In a preferred embodiment, the terminal ends of the lips214a,214bextend past and hook around and/or loop back onto the groove206formed by the track202in the mast200or the mast200itself, as shown inFIG.14. At least a portion of the mast200is therefore held between the terminal ends of the lips214a,214bof the mounting plate210and the second surface212of the mounting plate210that abuts the mast200. However, there is still sufficient clearance between the terminal ends of the lips214a,214band the mast200that either the mounting plate210and/or mast200may be slidably moved relative to the other in adjusting along the Z-axis.

The adjustable drill rig10also includes a Z-translational adjuster190, as shown inFIGS.13and15, which moves the mast200, and consequently the drill head220, linearly along the Z-axis. Thus, the Z-translational adjuster190allows the mast200carrying the drill head220to translate vertically, enabling the adjustment of tooling height. As with the other adjusters, the Z-translational adjuster190may be a hydraulic, pneumatic, electronic or manual motor, though is preferably a hydraulic motor as shown inFIG.13and similar to other hydraulic motor adjusters discussed above. For instance, it may have a cylinder and piston with the cylinder having a diameter in the range of about 3-4 inches, a power capacity of up to about 3000 psi and operative in a range of about 2000-2500 psi for load-bearing purposes, in at least one example, though other parameters are also possible. The Z-translational adjuster190includes a first mounting point192connected to the mounting plate210, as shown inFIG.13, and an opposite second mounting point193connected to the mast200, as shown inFIG.15. Preferably, the first and second mounting points192,193are located at terminal ends of the Z-translational adjuster190, such as on the piston and cylinder thereof in a hydraulic. When the Z-translational adjuster190is activated, it extends or contracts, moving the mast200linearly along the Z-axis. As with the previous translational adjusters, the translational movement provided by the Z-translational adjuster190is also limited by its length and travel distance, thus controlling how far up or down the mast200may be extended. For instance, the Z-translational adjuster190has an overall length less than the length of the mast200. In at least one embodiment, the Z-translational adjuster190has a travel distance of up to 50% of the total mast length, preferably in the range of about 25%-50% of the total mast length, though in some embodiments it may have a travel distance of at least 35% of the total mast length, and still more preferably about 50% of the total mast length. In one example in which the mast200has a length of 8-10 feet, the Z-translational adjuster190may provide a travel distance of up to 4-5 feet. This is but one non-limiting example for illustrative purposes. As the Z-translational adjuster190extends or contracts, it moves the mast200, which slides relative to the mounting plate210. Specifically, the lips214a,214bof the mounting plate210slidable hold the mast200, such as by the grooves206formed therein, and permits the mast200to slidably move relative to the lips214a,214b.

Turning toFIG.16, a drill head220is mounted to the mast200on the front side of the rig10and opposite from the various adjusters discussed previously. The drill head220is configured to receive the tooling to be used at the drill site, such as the drill. By having the drill head220secured to and movable with the mast200, adjustments to the tooling height, position and angle can be made easily and more readily viewable for confirmation of position and approach before the tooling is added to the rig10. The drill head220may mount directly to the front side of the mast200or by the track(s)202which may be along the front or sides of the mast200. For instance, as shown inFIG.16, the drill head220mounts to front grooves206along the tracks202of the mast200, such as with a bracket that clamps to the groove206of the track202, as inFIG.16, or may be secured to an aperture204in the track202by screws or bolts. The drill head220mounting may be secure and fixed, so that the drill head220is fixed and stationary relative to the mast200. In some embodiments, however, such asFIG.17, the drill head220may be rotatably mounted to the mast200, such as about a drill head pivot point223. A pin may be removed from the drill head pivot point223to enable rotation about the drill head pivot point223for adjustment, then when the desired position is achieved the pin may be reinserted to lock in the position.

In some embodiments, as inFIG.17, there may be a drill head adjuster224which may be used to rotate the drill head about the drill head pivot point223. Such drill head adjuster224may be a linear motor, such as a hydraulic, pneumatic or electric motor as described previously, and particularly similar to the X-rotational adjuster165discussed above. Such a drill head adjuster224may include a first mounting point226secured to the mast200and an opposite second mounting point228secured to the drill head. When activated, the drill head adjuster224may extend linearly, causing the drill head220to rotate about the drill head pivot point223and the X-axis. This is in addition to the X-rotational adjuster165. In other embodiments, the drill head adjuster224may be a rotational motor similar but not limited to the Y-rotational adjuster170discussed previously.