Abstract:
The present invention discloses a multi-purpose load lifting work platform or/and composite bridge structure, comprising a framework, at least one work platform, a drive mechanism, and an electrical control devices. One end of the pole-shaped structure is connected with the framework in a movable manner, and the other end of the pole-shaped structure is connected with the work platform in a movable manner, the work platform can run with the pole-shaped structure together. The work platform can run in a curve track relative to the framework by power, and can stop at any position in running track. This invention can provide two platforms working coordinately or a single platform working independently. The working area of the two platforms greatly exceeds that of the existing common equipment with a single platform. It can load bulky objects without sway, and can also be used as composite or assembly bridge structure.

Description:
FIELD OF THE INVENTION 
       [0001]    The invention relates to a multipurpose load lifting work platform, which can be also used as a modular structure for assembling a bridge. The multipurpose load lifting work platform is applicable to the following fields: crane, load lift, elevator, stage equipment, movable foundation for mobile house, stereoscopic parking equipment, stereoscopic storing and logistics equipment, carrying equipment, and bridge structure. 
       BACKGROUND OF THE INVENTION 
       [0002]    Most of current cranes, lifts, elevators or other carrying equipment works with the track of vertical lifting, the loads lifted sway back and forth and the horizontal stability of the load is poor. Also, only one work platform is provided. These defects result in their limited scope of use. In addition, each of the equipment consumes a considerable amount of energy during operation. 
         [0003]    On the other hand, in bridge construction, modular manufacturing and assembly have been achieved, but still need bridge machine or crane hoisting modular construction for accurate installation, and need a large number of artificial precision operations, and need a long period time of building. Furthermore, there are problems which remain to be solved in bridge construction, including long construction period and high degree of difficulty in construction and dismantling. In addition, most of the composite rapid bridging structures or machineries can be used only for bridging rather than for other purposes. 
       SUMMARY OF THE INVENTION 
       [0004]    The invention aims at overcoming the above deficiencies and providing a load lifting equipment with a curve trajectory. The load lifting equipment can provide the cooperated work of two platforms or the independent work of one platform. The pole-shaped structure is hinged with and supports the work platform. The work platform can move relative to the framework in a curve track and can stop at any position on the movement track. The working area of the two work platforms is substantially larger than that of the currently common load lift, elevator, crane and other lifting and carrying equipment operated with a single platform. The equipment can load large-size objects such as construction materials, automobiles, ores, ships, mobile houses, containers, etc., without sway, and also can be used as a composite or assembly type bridge structure. 
         [0005]    In addition, wireless transmitting and receiving devices can be optionally assembled respectively on the front and rear ends of the work platform during the transition movement of the work platform. When an obstacle is identified within the predetermined distance, such as a barrier within 1.5 m, the wireless transmitting and receiving device sends a signal to stop the running equipment, thus ensuring the work platform not to collide with the surrounding obstacles or persons during the running of the equipment. 
         [0006]    A new type blocking device with a spring button can be assembled optionally on the equipment. It can prevent a load from sliding down during the work of the equipment. In addition, wheels can be optional on four corners of the base of the framework of the equipment such that the equipment has mobility and can be moved to anywhere. Pickets are arranged inside the four columns and can be used for fixing on loose and soft foundations (such as outdoor sand grounds). 
         [0007]    A touch and stop device can be assembled optionally at each work platform of the inventive equipment on a side opposite to the automatic obstacle monitoring device to ensure the safety when the inventive equipment touches an obstacle and stops at the side of the work platform during operation. 
         [0008]    When operating one or more inventive equipment, the work platforms of every equipment are stayed at or close to the same horizontal position (a certain height difference between the work platforms is permitted) and the equipment are connected from the front to the end, the slope is arranged at both ends, a bridge can be built quickly, as shown in  FIG. 11 . Of course the inventive equipment can also be combined with the known bridge structure to build a new bridge, as shown in  FIG. 11-1 . A cushion layer of elastic materials can be laid at the joint to reduce bumping on road surface. A certain height difference between the platforms is permitted. In addition to having a level surface, the platform can also be made in concave-shape or bending-surface platform according to actual needs. By using such a work platform as the bridge structure, both assembly and disassembly of the bridge can be done easily. As the degree of freedom between structures of said equipment is high, the anti-shock performance is good. 
         [0009]    The design scheme of the invention is as follows: 
         [0010]    The load lifting work platform or/and composite bridge structure, comprising a framework, upper and lower work platforms, a platform driving mechanism, driven and driving aided mechanism, an electrical control device, an automatic obstacle monitoring device which can be optional, wheels and pickets which can be optional, and a blocking device and a touch and stop device which can be optional. The load lifting work platform or/and composite bridge structure provides a load lifting equipment with single platform operating or two platforms cooperatively operating. The work platform can run in a curve path around a direct or indirect connection point between one end of pole-shaped structure and the framework, and can stop at any position on the movement path. 
         [0011]    The work platform moves with the aid of driving mechanism and all or part of driven and driving mechanism, so that the work platform run in curve path movement around the direct or indirect connection point between the pole-shaped structure and the framework. 
         [0012]    The detailed structure of the equipment is described as follows: 
         [0000]    (1) The framework is classified into two types: four-column type and two-central-column type according to the number of the columns with fixed pulleys on the top.
 
1. Four-column type framework, comprising a base  11  and four columns  12 , and crossbeam  13 , column provided with a fixed pulley  14  on its top and a guide pulley close to the bottom  15 , and an intermediate supporting structure  16  between two crossbeams  13 . In this case, the intermediate supporting structure  16  can be optional depending on the actual load. The intermediate supporting structure is designed as a           or           shape, as shown in  FIG. 1 . The four-column type framework has a higher safety effect and a more reasonable stress state than the two-central-column type framework structure.
 
2. Two-central-column type framework: The difference between two-column-type and four-column-type is that two central columns  121  with two pulleys fixed on its top replace four columns with one pulley fixed at its top, and the rest of the structure is the same as the four-column type framework, as shown in  FIG. 11-1  and  FIG. 11 . This framework structure is the most economical, but load is concentrated on the two central columns, thus higher material strength and structural strength of the central columns are required.
 
(2) The work platform, comprising the upper layer work platform  21  and the lower layer work platform  22 , and the upper and lower layer work platforms can move interactively through the coupling of the driven and driving aided mechanism. When only one platform is required to work with, it is possible to arrange and use one part of the structure of the driven and driving aided mechanism, as shown in  FIG. 244  and  FIG. 245 . The work platform is hinged with the pole-shaped structure and has a curve movement path, and can stop at any position on the movement path. The work platform can be made in different shapes, such as elliptical or circular, and most often in a rectangular shape. The work platform can be one having a level surface or one having a convex-concave non-level surface according to actual requirements, and such a work platform has a certain curve effect. For example, when a ship is to be lifted, the work platform can be made in a platform with arc-shaped internal surface or can be made in a net-structure platform to facilitate berthing, as shown in  FIG. 223  and  FIG. 224 . Two work platforms provided for the same equipment can be different in size to adapt to special requirements. The platform can be also used as a movable foundation for a mobile house, as shown in  FIG. 244  and  FIG. 234 . When the work platform is used as a stage equipment, the platform can be designed as a long plate shaped structure which is heightened and thickened, as shown in  FIG. 7-1 , and can be merged into a large stage in array.
 
         [0013]    It should be noted that to adapt to the requirements for lifting in some circumstances, the platform can be simplified to the crossbeam, hook, lifting ring or special-purpose fixtures and riggings, as shown in  FIGS. 225 ,  226 ,  227  and  228 . If the requirements for the movement stability of a load to be lifted are not strict, which means swaying back and forth of the load during movement is permitted, it is possible to use one or two pole-shaped structures in parallel as the lifting mechanism to lift the load, and the work platform is simplified to the hook, lifting ring or special-purpose fixtures and riggings, as shown in  FIGS. 228 and 229 . 
         [0014]    All of these examples as mentioned above are one part of various forms of the work platform. 
         [0000]    (3) The driving mechanism as shown in  FIG. 1 , comprising a deceleration motor  31 , a conveyer belt  32 , a wire drum or chain receiving mechanism  33 , and the steel wire ropes or chains  34 - 1  and  34 - 2  ( 34 - 1  and  34 - 2  can be selected as either the steel wire rope or the chain, conveyer belt or cord) with one end connected with  33  and the other end fixed on the work platform or its end fixed and encircled in the groove of the rim of the semi-circular structure, and  34 - 1 ,  34 - 2  can be configured as multi-strand steel wire ropes or chains for heavy loads; wherein the gear motor  31  drives the roller  33  to rotate through conveyer belt,  43 - 1 ,  43 - 2  rolled on the steel drum is relaxed or tightened, and pull the appropriate platform  21  and  22  to move. Due to some restrict condition or requirement and in addition to being equipped with a driving mechanism for itself, the equipment can also be provided with a corresponding external driving mechanism while the equipment itself is not equipped with a driving mechanism. For example, when used as a bridge structure, the structure itself is very heavy, and the equipment itself needs to move only once or twice while keeping a stationary or stop state for most of the time. In this case, it is neither economical nor sufficient to depend only on the self-equipped driving mechanism of the equipment, and it needs the external large type driving unit.
 
(4) Driven and driving aided mechanism: the mechanism runs with the platform and drives the movement of the platform. It solves the issues that the linkage mechanics can not work smoothly in low-speed movement and the possible reversal or failure. The driven and driving aided mechanism can converse and transfer the kinetic energy and potential energy between two work platforms.
 
         [0015]    For the different types of the pole-shaped structures, two types of driven and driving aided mechanisms are provided. Any one of two types of the driven and driving aided mechanisms can be used in the inventive equipment independently, and they can also replace each other or be combined together in the equipment, or even be used as one part of the structure of each type in the equipment. If two types of mechanisms are used in combination, more safe transmission guarantee will be provided to improve the work efficiency. 
         [0016]    The pole-shaped structure refers to a stable structure which can be movably connected to the platform with the framework. One end of the pole-shaped structure is hinged with and supports the platform and the other end of the pole-shaped structure is connected with the framework in a movable manner directly or indirectly. The pole-shaped structures are encircled and connected by the wire rope, chain, conveyor belt or cord independently or mutually, achieving the coordinated movements. The pole-shaped structures comprise right-angle pole-shaped structure, semi-circular pole-shaped structure, circular pole-shaped structure, elliptical pole-shaped structure, semi-elliptical pole-shaped structure, drop pole-shaped structure, semi-drop pole-shaped structure, inverted drop pole-shaped structure and inverted semi-drop pole-shaped structure as will be mentioned hereinafter, wherein the semi-elliptical pole-shaped structure and elliptical pole-shaped structure are shown in  FIGS. 2-20  and  2 - 21 , the drop pole-shaped structure, semi-drop pole-shaped structure, inverted drop pole-shaped structure and inverted semi-drop pole-shaped structure are shown in  FIGS. 2-22 ,  2 - 23 ,  2 - 24  and  2 - 25 , which can increase or decrease the starting torque of the equipment. According to the increase of the actual load of the work platform, the pole-shaped structures can also adopt various stressed structure forms in construction engineering or mechanical engineering, such as truss structures, three forms of the truss structures as shown in FIGS.  2 - 16 - 1 ,  2 - 16 - 2  and  2 - 16 - 3 . The pole-shaped structures can be made to be different in length to adapt to special applications, such as the work platform required with a slope. Each work platform is supported by at least one pole-shaped structure  41 , and generally is supported by four or six pole-shaped structures; and if the actual load is very large, the number of the pole-shaped structures needs to be increased. For example, if six pole-shaped structures are selected to support the work platform, the load can be shared uniformly, thus the cross section area of each pole-shaped structure can be less, as shown in  FIG. 2-1 . 
         [0017]    Type  1 , comprising right-angle pole-shaped structures  41  (briefed as right-angle pole  41 ), sprocket  42 , a bearing box  43  and chains  44 . One end of the pole-shaped structure is connected on the framework via the bearing box  43 , the sprocket  42  is rigidly connected with one end of the pole-shaped structure  41 , and the chain  44  is encircled on the sprocket  42 . The assembly relationship of each component is shown in  FIG. 3-1 . Each work platform is supported by at least one pole-shaped structure  41 . The figures here are simplified to illustrate the principles briefly, and in the illustration and description afterwards, the work platform supported by four pole-shaped structures will be provided as an example. The pole-shaped structure can be selected as any form of the right-angle pole-shaped structures as shown in  FIGS. 2-1 ,  2 - 2  and  2 - 3 . The main function of pole-shaped structure bracing  46  is to increase the structural strength. The material strength of Type  1  must be good enough to bear the torque which the sprocket  42  applies to the pole-shaped structure. The function of this mechanism is to transfer the active movement of one work platform to the other work platform and make the other work platform to move cooperatively; the cooperative movement of the other work platform conforms to the principle of the mutual conversion between the potential energy and kinetic energy in physics such that a part of the kinetic energy can be transferred back to the active-movement work platform through the driven and driving aided mechanism. Therefore, the driving mechanism can drive the work platform to move without outputting too much power, thus achieving the objective of energy saving. The schematic diagram for spatial structure arrangement of pole-shaped structures, sprockets, chains, steel wire ropes, and upper and lower layer work platforms is shown in  FIG. 4 . 
         [0018]    Type  2 , comprising non-rectangular pole-shaped structures  41  (in particular comprising semi-circular pole-shaped structure, circular pole-shaped structure, elliptical pole-shaped structure, semi-elliptical pole-shaped structure, drop-shaped pole-shaped structure, semi-drop pole-shaped structure, inverted drop pole-shaped structure, inverted semi-drop pole-shaped structure), steel wire ropes or chains  18 ,  19  and  20  ( 18 ,  19  and  20  can be selected as either steel wire ropes or chains, conveyer belts or cords, wherein, one end of the steel wire ropes or cords needs to be fixed in the grooves of the rim of pole-shaped structure, and the chains and conveyer belts can be selected to circle on the pole-shaped structure or one end to be fixed at the pole-shaped structure), bearing box  43 , and a shaft  50 . The shaft  50  passes through a shaft hole arranged on the middle part of the pole-shaped structure and is fixed on the framework by the bearing box  43 ; the steel wire ropes or chains  18 ,  19  and  20  are encircled in the groove of the rim of the pole-shaped structure. The assembly relationship of the members is shown in  FIG. 3-2 . Afterwards, the description will be provided for the semi-circular or circular pole-shaped structure as an example. The semi-circular or circular pole-shaped structure can be selected as any form of those shown in  FIGS. 2-5 ,  2 - 6 ,  2 - 7 ,  2 - 8 ,  2 - 18 ,  2 - 19 ,  2 - 27 ,  2 - 28  and  2 - 29 , wherein,  FIGS. 2-6  and  2 - 61  are side views for two forms of the pole-shaped structure. The semi-circular or circular pole-shaped structure can be integrally shaped or be formed in a pieces-splicing manner, wherein,  FIGS. 2-18  and  2 - 19  illustrate the semi-circular or circular pole-shaped structure with toothed rim and these pole-shaped structures are used with the chains. The steel wire ropes are mounted in the grooves of the semi-circular rims of the semi-circular pole-shaped structures, as shown in  FIGS. 2-6  and  2 - 7 . The semi-circular pole-shaped structure can save more materials than the circular pole-shaped structure, and is easy to fix with the upper part of the pole-shaped structure. In the appropriate position, the semi-circular pole-shaped structure and the circular pole-shaped structure can replace each other, as shown in  FIGS. 2-15  and  234 . There are various connection manners between the circular and semi-circular pole-shaped structures, and the relatively economical and practical encircling paths and connecting positions are set as follows: the grooves of the rims of the pole-shaped structures  41 - 1  and  41 - 2  are connected by the steel wire rope or chain  18 , both ends of the steel wire rope or chain  18  are fixed on the groove of the rim of pole-shaped structure, the position of the fixing point is indicated by a small circle painted on the rope, as shown in  FIGS. 2-9 ,  291 ,  292 ,  293  and  FIG. 2-15  illustrating the relevant encircling path and position. The grooves of the rims of the semi-circular pole-shaped structures  41 - 3  and  41 - 4  are connected by the steel wire rope or chain  19 , and the position of the fixing point is indicated by a small circle painted on the rope, as shown in  FIGS. 2-10 ,  211 ,  212  and  213  and  2 - 15 . The grooves of the rims of the semi-circular pole-shaped structures  41 - 2  and  41 - 3  are connected by the steel wire rope or chain  20 , and the position of the fixing point is indicated by a small circle painted on the rope, as shown in  FIGS. 2-12 ,  266 ,  267  and  268  and anyone of four types illustrated in  FIG. 2-15 . When completing above connection measures, the functions of the sprocket  42  and the chain  44  in Type  1  of the inventive equipment can be completely replaced. One of three connection arrangements for  18 ,  19  and  20  as mentioned above can be independently used as one part of the driven and driving aided mechanism, as shown in  FIGS. 244 and 245  when only one work platform works, and also can be used with other connection manners in combination, for example when two work platforms work cooperatively. 
         [0019]    Another advantage of selecting the Type  2  is that this type can reduce the mechanical strength requirements of pole-shaped structure, and reduce the sectional area of pole-shaped structure, and save material and cost. The bracing of the pole-shaped structure can be omitted. The disadvantage of Type  2  is that Type  2  is more complicated than Type  1 . The figures here are simplified to briefly explain the principles, the parts of the driven and driving aided mechanism are shown only in  FIG. 1  (the Type  1  and Type  2  driven and driving aided mechanisms are used in combination) and  FIG. 2-15  (Type  2  driven and driving aided mechanism is independently used), and the driven and driving aided mechanism can be also mounted on corresponding positions of other shown figures. 
         [0020]    In Type  1  and Type  2 , there is a combined pattern of pole-shaped structure. That is, a longer pole-shaped structure replaces two adjacent pole-shaped structures in the middle of the framework. This pole-shaped structure has one hole in the middle of the structure for installing, both ends of the pole-shaped structure hinge with two work platforms, as shown in  FIGS. 2-26 ,  2 - 27 ,  2 - 28 ,  2 - 29  and  233 . This combined pattern reduces the number of the pole-shaped structures, but it needs high material strength and structural strength for the pole-shaped structure. The working state is shown in  FIGS. 233 and 333 . 
         [0000]    (5) The electrical control device, comprising: a digital circuit central control box  5  including a chip, a relay, a control switch, an adjustable resistor, a transformer, a travel switch and the like. The control switch can control the electric motor to rotate positively and reversely and to stop; the travel switch and the relay can control the work platform to stop on the determined position.
 
(6) The optional automatic obstacle monitoring device, comprising: wireless transmitting and receiving devices  6  mounted on the front and rear ends of the upper and lower work platforms, as shown in  FIG. 7 .
 
         [0021]    When an obstacle is identified within the predetermined distance, such as 1.5 m, a signal is sent to stop the running equipment, thus preventing the work platform from colliding with the surrounding obstacles or persons during the running of the equipment. 
         [0000]    (7) The wheels  7  can be assembled optionally on four corners of the base of the framework of the inventive equipment such that the inventive equipment has mobility. When equipped with a car chassis and power, the equipment can be moved to anywhere like a car, to optimize the reasonable allocation of equipment resources, as shown in  FIG. 8 . Pickets  8  can be optional inside the four columns and are used for the fixing on the loose and soft foundations (such as outdoor sand grounds), as shown in  FIG. 8 .
 
(8) The blocking device  9  can be assembled optionally to prevent objects parked on the work platform from sliding down. The blocking device can be also used separately on the ground of a parking lot as a parking bay lock. The blocking device, comprising an inwardly bent angle steel  92  which is provided with a hole  91  on the particular position of the side surface and has a generally inversed           shaped section, a square tube  93 , a spring button  95  with a keyhole  94  at its head and an insert tube at its rear, a shaft  97  with a wheel  96 , a protective edge  98  having a rotary axis, and a lifting handle  99 , as shown in  FIGS. 9-1  and  9 - 2 .
 
         [0022]    In use, the parking bay lock arranged horizontally is lifted up by the lifting handle, and the spring button  95  embedded in the inwardly bent angle steel automatically pops up and locks when encountering the hole  91 , thus representing a triangular supporting state, as shown in  FIGS. 9-3  and  9 - 4 . When the parking bay lock is to be unlocked, the spring button is pressed down with a finger, and under the effect of its gravity, the blocking device automatically slides down to a horizontal position, thus allowing an object to pass by, as shown in  FIG. 9-2 . 
         [0000]    (9) The optional touch and stop device  10 : a touch and stop device is mounted at each work platform on a side opposite to the automatic obstacle monitoring device, and is provided with two designs: 
         [0023]    Design I: Two metal tubes  10 - 3  are mounted on two corners at one side of the work platform, as shown in  FIG. 10 . The pressed emergency stop switch  10 - 1  is fixed on the top of the metal tube, and a pull  10 - 2  is connected between the two metal tubes and the pull  10 - 2  is the one for activating another emergency stop switch. When this side of the work platform collides with an obstacle during the operation, the obstacle compresses the pressed emergency stop switch or the pull is extruded, so the equipment stops timely. 
         [0024]    Design II: Elastic brackets  10 - 5  are mounted on two corners of one side of the work platform. The bracket has many forms, and the basic form is the door-shaped structure. Two legs of the bracket are equipped with elastic materials and thus are flexible; holes are provided in the middle of the elastic materials, and a rod-shaped structure  10 - 4  on the bracket passes through the middle hole of the elastic materials, and can contact another emergency stop circuit when the elastic materials are compressed, thus sending a signal to stop the equipment. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0025]    In the drawings,  11  represents a base,  12  represents a column,  121  represents a central column,  13  represents a crossbeam,  14  represents a fixed pulley,  15  represents a guide pulley,  16  represents an intermediate support structure,  2  generally represents a work platform which is subdivided into  21  representing an upper work platform and  22  representing a lower work platform,  23  represents a slope,  31  represents a gear motor,  32  represents a conveyer belt,  33  represents a wire drum,  34  generally represents a steel wire rope or chain having one end connected with the wire drum and the other end connected with the work platform or semi-circular or circular structure, wherein  34 - 1  represents a steel wire rope or chain related to one work platform and  34 - 2  represents a steel wire rope or chain related to the other work platform;  36  represents a rotating chassis,  41  represents the pole-shaped structures, wherein  41 - 1 ,  41 - 2 ,  41 - 3  and  41 - 4  represent optional semi-circular or circular pole-shaped structure,  42  represents a sprocket,  43  represents a bearing box,  44  represents a chain,  45  represents an anti-chain-disengaging device,  46  represents a pole-shaped structure bracing,  47  represents a semi-circular wheel,  48  represents a shaft hole of pin,  49  represents a pin,  50  represents a shaft,  5  represents a central control box,  6  represents a wireless obstacle monitoring device,  7  represents a wheel (optional),  8  represents a picket for fixing on the soft foundation (optional),  9  represents the whole blocking device,  91  represents a hole,  92  represents the inwardly crimped angle steel strut,  93  represents a square tube strut,  94  represents a keyhole,  95  represents a spring button,  96  represents a wheel,  97  represents a shaft,  98  represents a protective edge with a rotating axis, and  99  represents a lifting handle.  10 - 1  represents a pressed type emergency stop switch,  10 - 2  represents a pull for activating the emergency stop switch,  10 - 3  represents a metal tube,  10 - 4  represents a rod-shaped structure, and  10 - 5  represents an elastic bracket.  18 ,  19  and  20  represent steel wire ropes, chains or conveyer belts which are individually set to connect with the circular or semi-circular strut at the particular positions separately.  24  represents a crossbeam connected between the columns, and  25  represents a slope and cushion layer. 
           [0026]      FIG. 1  is an overall structure schematic diagram. 
           [0027]      FIG. 2-1  is a view of one work platform supported by six pole-shaped structures, with three pole-shaped structures arranged in parallel on each side of the crossbeam. 
           [0028]      FIGS. 2-2 ,  2 - 3 ,  2 - 4 ,  2 - 5 ,  2 - 6 ,  2 - 61 ,  2 - 7 ,  2 - 8 ,  2 - 16 - 1 ,  2 - 16 - 2 ,  2 - 16 - 3 ,  2 - 18 ,  2 - 19 ,  2 - 20 ,  2 - 21 ,  2 - 22 ,  2 - 23 ,  2 - 24 ,  2 - 25 ,  2 - 26 ,  2 - 27 ,  2 - 28  and  2 - 29  are schematic diagrams of various forms for the pole-shaped structures, wherein  FIGS. 2-6  and  2 - 61  are side views of the non-right-angle pole-shaped structures. 
           [0029]      FIGS. 2-9 ,  291 ,  292 ,  293 ,  2 - 10 ,  211 ,  212 ,  213 ,  2 - 12 ,  266 ,  267  and  268  illustrate the connection path, manner and position of the steel wire rope, chain, conveyer belt or cord  18 ,  19  and  20  in the groove of the rim of the semi-circular or circular pole-shaped structure, and the small circle painted on the rope indicates the position of the fixing point. 
           [0030]      FIGS. 2-15  and  234  are schematic diagrams of the driven and driving aided mechanism of Type  2  where the steel wire rope or chain  18 ,  19  and  20  are connected completely; wherein one end of  34  is connected with the particular position of the rim of the pole-shaped structure and the other end of  34  is connected with the wire drum. 
           [0031]      FIGS. 244 and 245  are overall structure diagrams with a single work platform in operation. 
           [0032]    FIGS.  2 - 16 - 1 ,  2 - 16 - 2  and  2 - 16 - 3  illustrate some truss structure forms employed by the pole-shaped structures under a heavy load. 
           [0033]      FIGS. 223 and 224  illustrate the work platforms with arc-shaped internal surfaces when lifting ships. 
           [0034]      FIGS. 225 ,  226 ,  227 ,  228 ,  229  and  230  illustrate various change forms of the work platform which is simplified as the crossbeam, hook, hoisting ring, special-purpose fixtures and rigging. 
           [0035]      FIG. 3-1  is a partially enlarged structural schematic diagram of the Type  1  driven and driving aided mechanism, and the pole-shaped structure, chain, sprocket, shaft and bearing box are assembled together;  FIG. 3-2  is a partially enlarged structural schematic diagram of the Type  2  driven and driving aided mechanism, and the semi-circular or circular pole-shaped structure, steel wire rope or chain, shaft and bearing box or shaft sleeve are assembled together. 
           [0036]      FIG. 4  is a spatial layout diagram of the pole-shaped structure, sprocket, chain, steel wire rope, and the upper and lower work platforms.  FIG. 41  is a schematic diagram to illustrate the connection of the pole-shaped structure and the platform when two work platforms move. 
           [0037]      FIG. 5  is a working state diagram with one work platform running up and the other work platform running down while selecting right-angle pole-shaped structure to assembly on the equipment. 
           [0038]      FIG. 6  is a working state diagram with one work platform running up and the other work platform running down while selecting semi-circular pole-shaped structure to assembly on the equipment. 
           [0039]      FIG. 7  is a working state diagram to illustrate how the automatic obstacle monitoring device works.  FIG. 7-1  illustrates the structural form of the work platform when it is used as stage equipment. 
           [0040]      FIG. 8  is an installed position diagram of the wheels and pickets on the soft foundation. 
           [0041]      FIG. 9-1  is an internal structural diagram for the blocking device, and here the spring button is compressed by an external force.  FIG. 9-2  is a side view of the blocking device placed horizontally.  FIG. 9-3  is a top view of the blocking device when it is lifted up and locked, and  FIG. 9-4  is a side view of the blocking device when it is lifted up and locked. 
           [0042]      FIG. 10-1  is a schematic diagram as Design  1  for the touch and stop device;  10 - 1  represents the pressed stop switch,  10 - 2  represents the pull for activating the stop switch, and  10 - 3  represents two metal pole-shaped structures.  FIG. 10-2  is a schematic diagram as Design  2  of the touch and stop device;  10 - 4  represents rod-shaped structure and  10 - 5  represent the door-shaped structure. 
           [0043]      FIG. 11-1  illustrates two middle columns with two fixed pulleys on the top, and  FIG. 11  is an overview diagram of two-central-column type framework, wherein the steel wire ropes or chains  34 - 1 ,  34 - 2  are connected with the circular pole-shaped structure  41 - 2 ,  41 - 3  respectively. The small circle painted on the rope indicates the position of the fixing point. 
           [0044]      FIG. 12  is a schematic diagram of two-central-column type framework, wherein the steel wire rope or chain  34 - 1  or  43 - 2  is connected with pole-shaped structure  41 - 1  or  41 - 4 , respectively. The small circle painted on the rope indicates the position of the fixing point. 
           [0045]      FIG. 233  is an overview diagram of the combined pole-shaped structure arranged with four-column type framework, and  FIG. 333  is an overview structure diagram of two-central-column type framework. 
           [0046]      FIG. 13  is a side elevation view of operating one or more work platforms of the equipment to build a bridge, and the view is simplified by omitting the driven and driving aided mechanism.  FIG. 13-1  is a schematic diagram wherein the inventive equipment is combined and arranged with the existing prior bridge structure to build a new bridge.  FIG. 13-2  illustrates a method for multiple parallel work platforms lifting synchronously. 
           [0047]      FIG. 14  is a schematic perspective view, and multiple work platforms are combined to build a bridge, and the framework is two-central-column type and four-column type framework, and the view is simplified by omitting the driven and driving aided mechanism and only drawing some cables at a few columns, wherein  23  represents the crossbeam between the columns, and the shadowed areas represent the filling and cushion layer arranged for the flat-surface road of the lower channel. 
           [0048]      FIG. 15  is a schematic diagram for bridge surface shape when multiple work platforms are combined to build a bridge. The work platform can be a horizontal surface platform or curve surface platform, wherein  2  are various shapes of the work platform,  25  is the slope and expansion joint device. 
       
    
    
     DETAILED DESCRIPTION 
       [0049]    Hereinafter, the invention will be further described in combination with drawings and examples. The framework is selected as a four-column type framework with pulleys at its top, and the load is exampled as vehicle. Due to different types of the pole-shaped structures selected, the driving mode of the equipment is different, which is embodied in the different position for connection of the steel wire rope or chain  34 . Now the description will be provided according to two types: 
         [0050]    Type  1 : when the right-angle pole-shaped structures shown in  FIGS. 2-1 ,  2 - 2  and  2 - 3  are selected, the steel wire rope or chain  34  are fixed on the work platform, as shown in  FIGS. 5 , and  34  can be selected as steel wire rope or chain, or be selected as cord or conveyer belt. Hereinafter, in order to simplify the description,  34  will be exampled as the steel wire rope throughout the description. When a vehicle is parked on the work platform  22  and the work platform  22  is moved to the upper level, the parking equipment is in the status shown in  FIG. 5 . When starting the switch, the gear motor  31  rotates positively to drive the wire drum  33  and the steel wire rope  34  to move via the conveyer belt  32 , the steel wire rope  34 - 1  fixed on the work platform  22  is tightened while the steel wire rope  34 - 2  connected with another work platform  21  is loosened. Under the pulling of the steel wire rope  34 - 1 , the work platform  22  runs up actively to drive the driven and driving aided mechanism (including four pole-shaped structures  41 , four sprockets  42  and chains  43 ) hinged with the work platform  22  to rotate. With the aid of the chain transmission, the rotation of these four sprockets drives other four sprockets and pole-shaped structures hinged with another work platform  21  to rotate, thus driving the work platform  21  to run down correspondingly. Two work platforms  21  and  22  can move simultaneously and transmit the power via the chain and sprocket, thus it can save the output of electrical power from the motor. When the work platform  22  runs up to the predetermined location, the other work platform  21  must run down to the predetermined location. When the work platform  22  approaches to the predetermined location, the travel switch will be touched, then the equipment stops, shown in  FIG. 5 . 
         [0051]    Upon taking the vehicle from the work platform, the gear motor reverse run is controlled by switch, so that the drum and the wire rope are driven to reverse, and the wire rope  34 - 1  is relaxed, and the work platform  22  runs down, and the steel wire rope  34 - 2  hinged with the other work platform  21  is tightened to drive the other work platform  21  to run up actively. With the transmission by the sprockets and chains, the work platform  22  runs accordingly from a high level to the ground, thus completing the procedure for taking a vehicle. 
         [0052]    The process of parking or taking a vehicle at the work platform  21  is opposite to the process of parking or taking a vehicle at work platform  22 . 
         [0053]    Type  2 : when the semi-circular or circular pole-shaped structures is selected, the steel wire rope or chain or conveyer belt  34  is fixed on the particular position of the semi-circular or circular pole-shaped structure at the end of the groove of the rim, as shown in  FIGS. 6 and 234 ; or the steel wire rope or chain or conveyer belt  34  can also be fixed on a particular position of the work platform, as shown in  FIG. 1 . When a car is parked on the work platform  22  and the work platform  22  is moved to the upper level, the parking equipment is in the status shown in  FIG. 6 . When starting the switch, gear motor  31  runs and drives the drum  33  and the wire rope  34  via the transmission belt  32 , the wire rope or chain  34 - 1  which is fixed in the groove of semi-circular pole-shaped structure is tightened, and the wire rope or chain  34 - 2  which is fixed in the groove of semi-circular pole-shaped structure for the hinge with the work platform  21  is relaxed. Under the pulling by the steel wire rope or chain  34 - 1 , the pole-shaped structure  41  is rotated around the shaft, and driving the work platform  22  to run up actively and thus driving the four pole-shaped structures  41  hinged with the work platform  22  to rotate. The rotation of these four pole-shaped structures, with the aid of the transmission of the steel wire rope or chain  18 ,  19  and  20  in the groove of the rim, then drives another four pole-shaped structures  41  hinged with the work platform  21  to rotate, thus driving the other work platform  21  to run down correspondingly. The two work platforms transmit power to each other through the steel wire rope or chain  18 ,  19  and  20 , thus ensuring the cooperative synchronous movement and also saving the power output of the electric motor. When the work platform  22  runs up to the predetermined position, the other work platform  21  runs down to the predetermined position simultaneously. When the work platform  22  approaches the predetermined rising position, it contacts the travel switch, and thus the running equipment stops, as shown in  FIG. 6 . 
         [0054]    Upon taking the vehicle form the work platform, the gear motor reverse run is controlled by switch, so that the drum and wire rope are driven to reverse, and the wire rope rounded in the groove of semi-circular pole-shaped structure is relaxed, and the work platform  22  runs down, and the wire rope  34 - 2  rounded in the groove of semi-circular pole-shaped structure is tightened to drive another work platform  21  to run up. 
         [0055]    With the transmission by the steel wire rope or chain  18 ,  19  and  20 , the work platform  22  runs accordingly from a higher level to the ground, thus completing the procedure for taking a vehicle. 
         [0056]    The process of parking or taking a vehicle at the work platform  21  is opposite to that of the work platform  22 . 
         [0057]    When the two-central-column type framework is selected for the inventive equipment, the arrangement position of the driving mechanism and the driven and driving aided mechanism are different from those mentioned above, but the mode of movement is substantially the same. Specifically, the steel wire rope or chain  34 - 1  and  34 - 2  is connected with the circular pole-shaped structure  41 - 2  and  41 - 3  respectively, as shown in  FIG. 11 ; wherein, one end of  34 - 1  is connected to the circular pole-shaped structure  41 - 2 , and the other end of  34 - 1  is passed though a fixed pulley on a central column  121 , and runs downwards to connect with the wire drum or chain receiving device (the central column  121  is provided with two fixed pulleys in parallel on its top); one end of  34 - 2  is connected with the circular pole-shaped structure  41 - 3 , and the other end of  34 - 2  is passed though the other fixed pulley on the central column  121 , and runs downwards to connect with the wire drum or chain receiving device. Alternatively,  34 - 1  and  34 - 2  can also be connected with the circular pole-shaped structure  41 - 1  and  41 - 4 , but the steel wire rope or chain needs to be longer, as shown in  FIG. 12 . 
         [0058]    When a longer pole-shaped structure is used to replace two adjacent pole-shaped structures between two work platforms, in case of the combined pattern of pole-shaped structure, one end of the steel wire rope  34 - 1  and  34 - 2  turns around a fixed pulley on the central column  121  respectively in opposite direction and runs downwards and then turns around a deflection pulley to be connected with the wire drum, and the other end thereof is fixed on the particular position of the work platform or the circular or semi-circular pole-shaped structure, as shown in  FIG. 333 . 
         [0059]    The working movement manner of the inventive equipment using the two-central-column type framework is in accordance with that of the inventive equipment using the four-column type framework. 
         [0060]    To increase the lifting capacity, the method of synchronous lifting for multiple parallel platforms can be applied, as shown in  FIG. 13-2 . For example, in bridge construction, multiple parallel platforms can increase the width of the bridge deck and the bearing capacity of the bridge. 
         [0061]    In addition, the wireless transmitting and receiving device is mounted respectively on the front and rear ends of the upper and lower work platforms during the movement of the upper and lower work platforms, as shown in  FIG. 7 . When an obstacle is identified within the predetermined distance, such as 1.5 m, a signal is sent out to stop the running equipment, thus preventing the work platform from colliding with the surrounding moving or stationary obstacles or persons during the running of the equipment. 
         [0062]    When the blocking device is used, the horizontally arranged parking lock is lifted up with the handle, and the spring button  95  embedded in the inwardly bent angle steel automatically pops up and locks when encountering the hole  91 , as shown in  FIGS. 9-3  and  9 - 4 ; when the blocking device is to be opened, the spring button is pressed down with a finger, and under the effect of the gravity, the blocking device automatically slides down to a horizontal position, as shown in  FIG. 9-2 . 
         [0063]    Wheel  7  can be optional on the four corners of the base of the framework of the inventive equipment, and the inventive equipment can be moved to anywhere when it is equipped with a car chassis, or can be towed by a truck to anywhere to optimize the allocation of equipment resources, as shown in  FIG. 8 . Pickets  8  can be optional inside the four columns, for fixing on the loose and soft foundation (such as outdoor sand ground), as shown in  FIG. 1  and  FIG. 8 . For the standard hard land, it is only necessary to connect the base with the ground by anchor bolts. 
         [0064]    Finally, the touch and stop device  10  can ensure that the equipment will stop emergently when the side of the work platform with the touch and stop device touches the obstacle during operation. 
         [0065]    The inventive equipment can load and unload different loads, and can replace some functions of load lift and crane under appropriate conditions. Further, a single or more equipment can be operated to rapidly build a bridge for vehicles and pedestrians, which can also provide an access with two upper and lower channels, and this is very useful in some emergencies or in case of natural disasters. Hereinafter, the application of the inventive equipment as a bridge composite structure will be specifically explained: 
         [0066]    When operating one or more inventive equipment, the work platform of every equipment is stayed at or closed to the same horizontal position (a certain height difference between the work platforms is permitted) and all work platforms are connected from the front to the end, and slopes are arranged at both ends, so that a bridge can be built quickly. Of course, the inventive equipment can also be combined with the existing bridge structure to build a new bridge, as shown in FIGS.  13  and  13 - 1 . It is not necessary for the two work platforms of each equipment or the platforms of multiple equipments to stay at an absolutely same horizontal level, and a certain height difference is permitted, as show in  FIG. 13 . Thus, an appropriate sloping can be formed, and rubber cushion layers and slopes can be arranged at joints to reduce the bumping from road surface. In this case, it is very convenient to dock the platforms, namely dock the bridge deck structures without strict requirements. In the traditional methods of docking the deck of bridge, the weight of the section of bridge is concentrated at the column in the junction, and the bridge machine or crane is needed to lift the heavy structure of bridge to the precise position. While using the work platforms of this equipment to build one bridge, it is not necessary to set the column to support the weight of bridge structure at the junction of the structure of bridge. It reduces the difficulty of building a bridge and saves time. The reason is that the whole weight of the structure of bridge is supported by the wire rope or chain  34 , the hinged pole-shaped structure, and the column of the framework. With the help of driven and driving aided device, it regulates the force balance of two work platforms of the equipment. Of course, increasing the number of columns to support the weight of the bridge at the junction of the structure of the bridge can improve the capacity of the overall force for the structure of the bridge. 
         [0067]    Also, the work platform and column can be designed with different heights according to the changes of topography, as shown in  FIG. 13 . 
         [0068]    In a manner of synchronous lifting with multiple parallel work platforms, as shown in  FIG. 13-2 , for example, in bridge construction, multiple parallel work platforms are arranged to increase the width of the bridge deck and the bearing capacity of the bridge. 
         [0069]    In addition, according to the increase of actual load of the work platform, and referring to the arrangement of the stayed-cable bridge or suspension bridge in construction engineering, the number of the steel wire ropes or chains connected between the work platforms and the columns can be increased, and the number of the pole-shaped structures can be increased, and the number of crossbeams  24  connected between two columns can be increased when necessary, as shown in  FIG. 14 . According to the amount of the actual load of the work platform, the pole-shaped structures can also have many stressed structure forms in construction engineering or mechanical engineering, such as reinforcing bar and truss structure. The shadowed areas in  FIG. 14  represent the filling and cushion layers arranged for a flat surface of the road of the lower channel. 
         [0070]    The work platform can be made into a concave-shape or bending-surface platform according to the actual need. Such a work platform has special usage in some aspects, for example, it will be very helpful to bridging, as shown in  FIG. 15 ; wherein  25  refers to the slope and the extensible joint device. 
         [0071]    When dismantling the bridge, the equipment can be operated to automatically “shrink” into the upper and lower platforms automatically. Then it will be towed away by the construction party. If a certain section of the work platform fails or is damaged, a new equipment can replace such section of equipment, or the equipment can be controlled to lower the failure or damage section of platform for maintenance and replacement at low altitudes or near the level of ground or sea. Such a method reduces the difficulty in maintenance and saves maintenance time. 
         [0072]    It should be noted that in order to meet the requirements for lifting in some circumstances, the platform can be simplified as a crossbeam shown in  FIGS. 225 and 226 ; or it is even possible to directly use the hook or lifting ring linked with the pole-shaped structure for lifting, as shown in  FIGS. 227 and 228 . When a container is lifted, the pole-shaped structure of the equipment can be directly placed at the two sides of the container, herein the platform is simplified as the crossbeam, and then can be connected with the top corner parts or bottom corner parts of the container by pins through the clamps and riggings of the crossbeam; or the bottom of the load is directly upheld by a net-shaped part hung and connected to two crossbeams.  FIG. 225  illustrates a lifting along the direction of the length of the container. Alternatively, it is possible for lifting along the direction of the width of the container, as shown in  FIGS. 226 and 229 . 
         [0073]    If the requirement of horizontal stability for lifting a load is not high, which means swaying back and forth of the load is permitted, it is possible to use one or two pole-shaped structures in parallel as the lifting mechanism for lifting the load, and herein the work platform is simplified as the hook, lifting ring or special-purpose fixture and riggings, as shown in  FIGS. 228 and 229 . In  FIG. 229 , only one pole-shaped structure is used and the work platform is simplified as a special-purpose fixture for container, and the container can be rotated at an angle close to 360 degree in the vertical plane.  FIG. 230  illustrates how two pole-shaped structures in parallel are used. The work platform is simplified as a special-purpose fixture for container and the container can be rotated at an angle close to 360 degree in the vertical plane. 
         [0074]    The above describes the specific cases of the implementation of the patent. The patent is not limited to the above icon or description of the specific structure, but also covers all changes of the essence spirit and scope from the patent.