Patent Publication Number: US-2016222657-A1

Title: Jointable arcuate veneer wood panels

Description:
FIELD OF THE INVENTION 
     The present invention relates to wood laminate panels, a system of two or more laminate panels joined permanently together, a method of making the panels and a method of fabrication of objects with the panels. 
     BACKGROUND OF THE INVENTION 
     Curved wood products are used in a number of applications from small degree curves in furniture to full cylindrical shapes as drum kits to solid wood pieces banded together into staves or barrels. As far back as 1950, the US Forest Service investigated different methods of producing curved veneer products. However, of the few curved wood products commonly in manufacturing today, most are steam bent solid wood products and none are longer than an individual sheet of veneer, these still have the ability to produce a system at multiple panels in large and varied number of shapes. 
     SUMMARY OF THE INVENTION 
     In accordance with one aspect of the present invention, there is provided a wood laminate panel comprising an elongated body having a longitudinal axis and extending a length thereof, the body having an arcuate cross-section in a plane substantially perpendicular to the longitudinal axis defined by: a first and second spaced apart curved surfaces, the first surface being concave and the second surface being convex, first and second spaced apart edge surfaces interconnecting longitudinal ends of the first and second curved surfaces; wherein the first and the second spaced apart surface edges extend along the length of the elongated body and each include an attachment joint, the attachment joint of the first spaced apart surface edge having a shape that is complementary to that of a second spaced apart edge surface of a second wood laminate panel such that the wood laminate panel is permanently bonded with the second laminate panel through an engagement of adjacent complementary edge surfaces and such that the first and second spaced apart curved surfaces extend continuously from the attachment joint. 
     In accordance with another aspect of the wood laminate panel herein described, the first and second spaced apart surface edges include at least one male profile and a complementary female profile respectively adapted to fit one into the other and jointable with the adjacent identical laminate panel. 
     In accordance with yet another aspect of the wood laminate panel herein described, the least one male profile and the complementary female profile are a finger joint comprising two male profiles and at least two female profiles. 
     In accordance with still another aspect of the wood laminate panel herein described, the arcuate cross-section is semi-circular. 
     In accordance with yet still another aspect of the wood laminate panel herein described, the semi-circular cross-section has an arc-length of less than or equal to 180°. 
     In accordance with a further aspect of the wood laminate panel herein described, the arc-length is selected from the group consisting of 45°, 90°, 120°, and 180°. 
     In accordance with yet a further aspect of the wood laminate panel herein described, the arc-length is 120°. 
     In accordance with still a further aspect of the wood laminate panel herein described, the length of the panel is 8 feet. 
     In accordance with another aspect of the invention, there is provided a system of wood laminate products, the system comprising at least a first and a second wood laminate panel, the first and the second wood laminate panel each comprising first and second spaced apart curved surfaces, each of the first and second spaced apart curved surfaces having an axial edge surface including an attachment joint that is complementary with the attachment joint of the other wood laminate panel, wherein the attachment joint permanently bonding the first and the second wood laminate panel together through an engagement of the axial edge surfaces and extending the first and second spaced apart curved surfaces. 
     In accordance with another aspect of the invention, there is provided the system herein described wherein the wood laminate panel has a semi-circular cross-section with an arc-length of less than or equal to 180°. 
     In accordance with another aspect of the invention, there is provided the system herein described wherein the wood laminate panel has an arc-length of selected from the group consisting of 45°, 90°, 120°, and 180°. 
     In accordance with another aspect of the invention, there is provided the system herein described further comprising a third wood laminate panel, wherein the first and the second and the third wood laminate panel each panel has the arc-length of 120°, and are joined to produce a cylindrical cross-section. 
     In accordance with another aspect of the invention, there is provided the system herein described wherein the first and the second wood laminate panels are attached to produce an S cross-section. 
     In accordance with another aspect of the present invention, there is provided a method of producing an axially jointable edge surface wood laminate panel comprising providing a plurality of softwood veneer sheets; preparing the veneer sheets in a cross-ply arrangement; providing an adhesive; applying the adhesive to at least three of the veneer sheets; aligning the at least three veneer sheets to produce a multilayer adhered flat panel; pressing the multilayered adhered flat panel into or with an arcuate form to produce a semi-cylindrical panel having two axial edge surfaces; and profiling the two axial edge surfaces of the semi-cylindrical panel along length of the at least three veneer sheets to produce the jointable wood laminate panel comprising complementary axially jointable edge surfaces. 
     In accordance with yet still a further aspect of the method herein described, the profiling of the two axial edge surfaces include at least one male profile and a complementary female profile respectively adapted to fit one into the other and jointable with the adjacent identical laminate panel. 
     In accordance with one embodiment of the method herein described, the least one male profile and the complementary female profile are a finger joint comprising two male profiles and at least two female profiles. 
     In accordance with another embodiment of the method herein described, the softwood veneer sheets have a thickness ⅛″. 
     In accordance with yet another embodiment of the method herein described, the softwood is selected from the group consisting of hemlock, amabilis fir, Douglas fir, SPF and combinations thereof. 
     In accordance with yet another aspect of the present invention, there is provided a method of producing a wood laminate object comprising the steps of: providing a plurality wood laminate panels herein described each having an axial length; and permanently jointing a first axial edge surface of a first panel to a second axial edge surface of a second panel. 
     In accordance with still another embodiment of the method herein described, jointing the first axial edge surface to the second axial edge surface is with an axial offset of at least 20% of the length of the panel. 
     In accordance with yet still another embodiment of the method herein described, the panels have an arc length of 120°. 
     In accordance with a further embodiment of the method herein described, further comprising permanently jointing the first and the second panels together to produce an arc length of 240°. 
     In accordance with yet a further embodiment of the method herein described, wherein permanently jointing a third axial edge surface of a third panel to a non-jointed first and second axial edge surface with an axial offset of at least 20% of the length. 
     In accordance with still a further embodiment of the method herein described, further comprising permanently jointing the first and the second panels together to produce an S-shaped cross section. 
     In accordance with yet still a further embodiment of the method herein described, further comprising permanently jointing a third axial edge surface of a third panel to a non-jointed first axial edge surface and a fourth axial edge surface of a fourth panel to a non-jointed second axial edge surface to producing a tear drop shaped cross-sectional member. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a wood laminate panel according to one embodiment of the present invention illustrating an elongated body and axial edge surfaces; 
         FIG. 1A  is another perspective view of the wood laminate of  FIG. 1 ; 
         FIG. 2  is a schematic representation of an arcuate thickness of a wood laminate panel according to another embodiment of the present invention having three veneer layers and two adhesive layers; 
         FIG. 3  is a schematic representation of a portion of the axial edge of a wood laminate semi-cylindrical panel according to another embodiment of the present invention illustrating a finger joint applied to LV curves allowing them to be offset and connected into cylinders allowing for continuous connection of the panels; 
         FIG. 4  is a schematic representation of an alternating lay-up of the wood laminate panel according to one embodiment of the present invention illustrating a connected culvert portion, offset joints; 
         FIG. 5  is a photograph of three jointed wood laminate panel system according to one embodiment of the present invention that illustrates a substantially arcuate culvert without a bottom; 
         FIG. 6  is a photograph of a plurality of wood laminate panels according to one embodiment of the present invention nested one inside the other before their axial edge surfaces are jointed; 
         FIG. 7  is a flow diagram of the method of making a wood laminate panel according to one embodiment of the present invention; 
         FIG. 8  is a photograph of multiple wood laminate panels illustrating a laminated curve lay-up using a mold and press to form one or multiple curved plywood semi-cylindrical panels; Wood grain orientation may vary with each layer being place between 0 to 90° with respect to the length of the curve. 
         FIG. 9  is a series of images of three wood laminate semi-cylindrical panels according to one embodiment of the present invention having an arc length of 120° illustrating (from left to right) the method of interlocking three panels according to one embodiment of the present invention; with axial joints in close proximity but not attached; the three panels with joints beginning to nest/mesh; the three panels with the three joints virtually meshed, and finally the three panels with three joints permanently meshed into a cylindrical system according to one embodiment of the present invention; 
         FIG. 10  is a flow diagram of the method of making objects with the wood laminate semi-cylindrical panels according to another embodiment of the present invention; 
         FIG. 11  is a perspective view of a method of making objects with the a wood laminate semi-cylindrical panels according to one embodiment of the present invention, including staggering the panel (Shell Lay-Up) and a cylindrical system of panels according to another embodiment of the present invention; 
         FIG. 12  is a perspective view of a variety of types of formworks for concrete slabs produced using wood laminate semi-cylindrical panels according to one embodiment of the present invention, illustrated are four (4) curved plywood system profiles for concrete formwork according to several embodiments of the present invention; 
         FIG. 13  is a perspective view of a deck or sandwich panel (Floor/Wall/Roof) produce using wood laminate semi-cylindrical panel system according to another embodiment of the present invention—illustrating two examples illustrate of multiple plane plywood combinations; 
         FIG. 14  is an image of wall systems produced using wood laminate semi-cylindrical panels according to one embodiment of the present invention illustrating how different depths may be achieved; 
         FIG. 15  is an image of two examples of cross-sectional profiles of columns produced using a wood laminate semi-cylindrical panel according to one embodiment of the present invention; 
         FIG. 16  is an image of two examples of cross-sectional profiles of ductwork produced using a wood laminate semi-cylindrical panel according to one embodiment of the present invention; and 
         FIG. 17  is a photograph two nested culverts having different radii produced using a wood laminate semi-cylindrical panel according to one embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present describes wood laminate panels that have permanently and/or irreversibly jointable edge surfaces, and a system produced by the joined the wood laminate panels The wood laminate panels are made at a plurality of veneer sheets stacked and glued together with an adhesive. 
     Permanently jointable edge surfaces are defined herein as joint surfaces that fit one into another and mesh strongly permanently and without the further application of adhesive. The edge surfaces are also complementary with other edge surfaces of other wood laminate panels of the present invention. The permanently jointable edge surfaces may take many forms. In a preferred embodiment the jointable edge/axial surfaces are complementary, male and female finger joints that are continuous along the length of the axial edge. 
     The jointable edge/axial surfaces are profiled to be complementary. 
     Complementary is used to define the profile of the axial edge surfaces, and means that the edge surfaces are shaped to join on a wood edge surface into the other. In one embodiment, a male profile member(s) is permanently jointable with the female profile member(s) of the axial edge surfaces. The profile is made in alignment with the veneer sheets/layers not perpendicular to the sheets/layers. 
     The word jointing is used similarly and is defined a producing a permanent joint between the panels of the present invention. 
     The system of the present invention once permanently joined extends the surfaces of the wood panels in a continuous manner, such that the arcuate surfaces despite the attachment joint have a continuous surface shape on both sides of the attachment joint. 
     Turning to  FIG. 1 , that illustrates an isometric view of a wood laminate arcuate panel  5 , having an elongated body  10  with an axial length  , along the an imaginary axis  2  of the cylinder of the body  5  having an arcuate cross-section  12 . In a preferred embodiment the arcuate panel is semi-circular in cross-section although other cross-sectional shapes can be envisaged. The present application describes a wood laminate arcuate panel  5 , produced in a repeatable manner, and affording the possibility of producing a wide range of useful objects including plywood laminate arcuate panel sections that in a preferred embodiment may have circular in cross-section. 
     The panels  5  described herein, can be joined to make a system of panels thereby producing objects of different shapes having an almost indeterminate length, as well as varied durability and strength, from these relatively simple panels  5 . 
     The laminate has a plurality of veneer layers/sheets  7  held together by layers of adhesive. Some aspects of the panel  5  include: 1) a plurality of layers  7  of pressed softwood veneer, that in a preferred embodiment have an semi-circular/semi-cylindrical cross-section having an arc length  22  of 120°. 
     The semi-cylindrical curved panels  5  are in a preferred embodiment 8 feet in axial length,  , with effective (inner diameter) 14 inch diameter (or a 7 inch radius, r 1 ). The veneer layers  7  are laminated/held together using an inert adhesive that in a preferred embodiment is a polyurethane with low sodium/potassium salt levels that requires no heat to set the adhesive. The plurality of veneer layers  7  with adhesive have an arcuate thickness, t, that in a preferred embodiment is semi-circular/sem-cylindrical. 
     Two axial edge surfaces  14  are spaced apart and at opposite ends of the curved surfaces and have substantially the thickness t, and substantially the length,  , of the body/panel  10 / 5 . Axial edge surfaces  14  comprise joints  24   a ,  24   b , such as finger jointed edge surfaces that are complementary with one another and adapted to fit into a complement edge surface of an second identical panel described herein. 
     In a preferred embodiment, the joints  24   a , and  24   b  on the axial edge surface  14  comprise at least one male profile joint  24   a  adapted to fit into a complementary female joint  24   b . As the wood laminate panels of the present invention are made in a repeatable manner the female joints  24   b  of a second panel  5  are compatible with the male joints  24   a  of the first panel. With this compatibility, where a second, third, fourth, fifth etc. wood laminate panel have compatible joints, assembly of these curved panels into a multipanel system of cylinders and other shapes is possible. Once again these axial edge surface joints  24   a / 24   b  join together permanently without any further adhesive having to be applied. The joints have a profile that is substantially aligned with the veneer layers of the laminate panel. 
     The panel  5  also has an arcuate cross-section  12  of thickness, t, defined by a first arced curve  16  (often considered the inner convex curve) with first/inner opposite ends, and a second arced curve  18  often considered the outer concave curve, having two second/outer opposite ends. The opposite ends of the inner and outer arced curves  16 / 18  terminate at the axial edge surfaces  14 . As will be seen the inner curve  16  and the outer curve  18  may be interchangeable when producing various objects with the semi-cylindrical panels  5  as described herein, with curve  16  becoming the outer curve and curve  18  becoming the inner curve. 
     In a preferred embodiment the curves are semi-cylindrical. The inner curve  16  having a radius, r 1  and the outer curve  18  having a radius r 2 . The radius r 1  being less than r 2 . 
     The wood laminate arcuate panel  5  generally includes from 3 to 12 veneer layers  7  interspersed between 2 to 11 adhesive layers, with 4 to 8 veneer layers  7  being particularly preferred. Each veneer layer having a thickness from ⅛″-¼″. Between each veneer layer  7  there is an adhesive layer that may be a polyurethane adhesive. 
     The elongated body  10  includes a first/inner concave surface  26  produced by the intersection of the first/inner arced curve  16  with the axial length  . Similarly, the second/outer convex surface  28  is generated by the intersection of the second/outer arced curve  18  with the axial length  . 
     The arc length  22  of r 1 , and r 2  may be any lengths up to and including 180°. The preferred arced length are 45°, 60°, 90°, 120° and 135°. Particularly preferred arc lengths are 90° and 120°, with 120° being most preferred.  FIG. 2  illustrates a three veneer layer arcuate cross-section  12  in the shape of a U and having only a partially semicircular cross-section. The final radius of the panel  5  can be determined by the requirements of the application. 
     The elongated panels  5  of the present application are particularly well suited for use as culverts buried in roads to allow for the passage of water through the road network rather than damming it on one side. Resource roads have a high degree of variation in lifespan, depending on perceived utility of the road—some are installed for the long term as arteries, while others are more temporary capillaries servicing areas for short periods. 
     Culverts range in length, diameter and in-situ longevity based on site conditions and materials for culverts are selected accordingly. Culverts were once commonly made of wood (box culverts), but are now predominantly made of corrugated steel or high density polyethylene because of ease of installation, standard availability and long term performance. Box culverts made of wood were commonly used in the early days of resource road building and performed well over time, but were generally custom built using available materials at the time and not re-usable. 
     However, several issues arise when installing culverts made of plastic or steel. On one hand, steel and plastic are designed to last many years in ground contact, often much longer than the lifespan of the road and have an associated high cost—approximately $300 for a 20 foot section at 14″ diameter. The road contractor is paying for an unnecessarily long life. The anticipated retail selling price for the bio-degradable culvert described herein is $225 for the same section or 25% lower in price for the product only. 
     The other issue with plastic and steel culverts is the need to remove all foreign materials from a resource road upon deactivation. In this case, the cost of removing plastic or steel culverts presents a significant cost, including heavy equipment and culvert transport trucks, in addition to the cost of carefully removing the culvert for re-use elsewhere, a process in which attrition occurs. The cost of removing culverts is believed to be at least equivalent to the product cost or at least $300 per culvert. Therefore, combining the cost advantage of the bio-degradable culvert and the foregone removal cost, the bio-degradable culvert is equivalent to a 60% savings. 
     Finally, both HDPE and steel culverts are known to deteriorate over time, such that the HDPE becomes brittle and the steel culvert corrodes, in both case depositing foreign materials into the natural environment. 
     The market for culverts in the production and maintenance of BC forest roads is worth millions of dollars annually. Estimates suggest over 2000 km of new roads are constructed annually, requiring at least five culverts per kilometer. In addition, there are also more than 35,000 kms of maintained forest resource roads. If only considering non-fish bearing streams on new roads, the market is worth approximately $14 million per year. When adding non-permanent resource roads for the growing oil and gas and pipeline sectors in BC, Alberta, the market could be many times larger. 
     An important components of the wood laminate panel  5  described herein, are softwood veneers commercially available of ⅛″ and ¼″ thicknesses and in a variety of species—hemlock, amabilis fir, Douglas fir, SPF. Polyurethane adhesive is applied on one face of the veneer as it is laid into the curved-steel mold in a press. The number of layers of veneer is specific to the application, durability requirement and loading, but for prototyping purposes, the present inventors have built 5 ply cylinders at 14″ diameter. 
       FIG. 3  illustrates an axial edge surface  14  finger joint  24   a/b  than may in a preferred embodiment be along the entire length of axial edge surface  14 . The joints  24   a/b  may be discontinuous or continuous, and may not run along the entire axial length  . Therefore in a preferred embodiment of the axial edge surface the male profile and the complementary female profile are a finger joint comprising two male profiles members and two complementary female profile members that are permanently jointable. As can be seen, the profile of the finger joints is in substantial alignment with the veneer sheets of the laminate panel, not perpendicular the veneer sheets. 
       FIG. 4  illustrates an outer surface of a culvert with the axial joint  24  running horizontally across the figure and showing an intersection  32  of three continuous curves. The arrow  34  illustrates a butt joint that meets at the intersection point  32  with the axial joint (running vertically down the figure). The axial finger joints lock different panels  5  together, and allows for end joints that are simple lap joints or butt joints. This Figure illustrates that connected shells must come together at the same time to mesh. Once in place, a single shell may not be removed without the adjacent shells equally separating. 
     The uniqueness of culverts made of the wood laminate semi-cylindrical panel described herein is 1) the method by which final assembly culvert is made, 2) its end-use flexibility and 3) its bio-degradability. 
     1) The curved, finger jointed pieces are assembled in an offset manner to allow for repeating and no butt joints. The finger joint allows the product to slide together into a cylinder that requires force applied equally in all directions from the inside to separate the pieces from one another—the benefit of cylindrical strength, with the repeatable manufacturing of pressing in 120° segments. Assembling the pieces in this manner also allows for custom lengths. The target is generally 20 foot lengths, but adjustments can be made on site to extend the culvert if necessary. 
     2) The repeatability of the 120° curved base unit allows for culverts to be any length assembled and also offer the opportunity to assemble on site to adjust to terrain conditions—i.e. 12 curved pieces can be transported as shells in a pick-up truck and assembled into a culvert on site from 1-4 units in length. 
     3) The wood culverts are made of natural wood and a small component by weight of resin, an inert polyurethane spread at 14 g/sqft or a bio-based resin. If left in service, the culvert is engineered to slowly bio-degrade over time, depending on soil conditions, from 3-10 years. No other culvert currently manufactured bio-degrades, thereby substantially reducing the road decommissioning costs. 
     The present invention also provides a method of producing differently shape culvert systems. There is a push in resource road management to have culverts without bottoms, as illustrated in  FIG. 5 , to avoid disturbance when removed. The veneer-based culvert provides two advantages here: 1) if the culvert does not need to be removed, the bottom is not disturbed and 2) in assembling the culvert one or two of the 120 degree sections can be avoided, while maintaining a significant degree of strength. Corrugated products can not physically offer this flexibility because the strength of the product is in its full cylinder shape, rather than a half cylinder or ⅓ cylinder. The wood laminate semi-cylindrical panels  5  described herein are also more easily transported on flat-bed trucks in a nested manner illustrated in  FIG. 6 . 
     The present invention also provides a method  40  of  FIG. 7  for producing the wood laminate semi-cylindrical panels  5  into a cylindrical system of panels that have complementarily axially jointable edge surfaces i.e that are axially jointable. The method for producing the axially jointable wood laminate semi-cylindrical panels  5  begins with providing a plurality of softwood veneer sheets  48  previous discussed with continuous surface. The sheets  48  are prepared  50  (i.e. are cleaned, dried, heated, arranged in a cross-ply or otherwise prepared, with these methods being known to the skilled person in the art) to produce prepared veneer sheets  52 . An adhesive or adhesives  54  are provided. The provided adhesive is applied  56  to the prepared veneer sheets  52  that are aligned appropriately and allowed set sufficiently for further processing. Wood grain orientation of the veneer sheets may vary with each layer being place between 0 to 90° with respect to the length of the curve. These flat multilayer veneer panels  58  are then sent for pressing. The pressing involves the placement  60  of one of multiple flat panels  58  onto an elongated semi-cylindrical female form that has a length equal to or longer than the sheet  58  length. The sheet  58  are then pressed  62  into the form by a complimentarily shaped male form. Optionally heat  64  may be applied to further set the adhesive, and a wood laminate semi-cylindrical panels less jointed axial sides  68  is produced. The skilled person would under the flat panels  58  could be placed over a male form of appropriate length and then pressed by a female complementary form to produce the wood laminate semi-cylindrical panels  68 . 
     The panels  68  are removed from the forms and their axial edge surfaces  14  are profiled into complementary joints to produce the wood laminate semi-cylindrical panels  5 , that can be permanently axially jointed into a wide variety of shapes that will be described herein, including axially connecting 120° arc length panels producing novel or unconventional shapes to support the flow of water under roadways. 
       FIG. 8  is a photograph of multiple wood laminate semi-cylindrical panels illustrating a laminated curve lay-up using a mold (form) and press to produce one or multiple curved plywood panels at one time. The shells may vary in profile, thickness, and species. These shells are then jointed along their edge in such a way as to combine with other similar shells to become part of a larger assembled product. 
       FIG. 9  illustrates three wood laminate semi-cylindrical panels  5  having an arc length of 120°. The photographs from left to right illustrating the complementarily axially jointable edge surfaces, interlocking into each other. The first image on the far left the joints are visibly separated but in close proximity and not attached; in the next image the joints are beginning to nest/mesh; in the third image the three panels are virtually meshed, and in the final image on the far right the three panels with three joints meshed and the axially joints are not visible. In method of making an object limits the length of the object produced to the length of the wood laminate semi-cylindrical panels  5 . 
       FIG. 10  is a schematic representation of a method  80  for producing various objects with the wood laminate semi-cylindrical panels  5  that comprise complementarily axially jointable edge surfaces. The first step  82  is providing a plurality of panels  5 . The panels provided are jointed  84  with a first axial edge of a first panel attached to a second axial edge of a second panel. In a preferred embodiment, the joining of the first axial edge of the first panel to the second axial edge of the second panel are offset  86  by at least 20% of the axial length of the first panel. In a particularly preferred embodiment the panels  5  have an arc length of 120°. Connecting the panels  5  in this manner ensures that there are no continuous butt joints and allows for a variety of lengths of final product. 
     The first and the second panels may be jointed to produce either a system having a greater circular arc length or a S-shape cross-section seen in  FIG. 13 or 14 . 
     The method  80  may continue, with a repeating step  90 , where steps  82 ,  84  and  86  can be repeated as often as required. For example, in a further step  84 , a third panel is jointed to the as of yet non-jointed, second axial edge of the second panel once again with offset of at least 20% of the axial length of the second panel. The second (non-jointed) axial edge surfaces of the first panel and the third panel are also jointed. This type of construction (if the arc length of the panels  5  is 120°) produces a circular cross-section or tube where no butt-joints between sections of axially jointed panels  5  are aligned. This jointing construction can continue to be repeated to produce a length of circular cross section of virtually indefinite length. If non-120° arc length sections of the panels  5  (i.e. 45°, 90°, and 180°) are used various other closed tubular shapes may be produced. 
     The method can be easily extended to produce a wood laminate system having a tear drop cross section, obtained by jointing a first and second panel into a 240° semi-cylindrical shape and then permanently jointing a third axial edge surface of a third panel to a non-jointed first axial edge surface and a fourth axial edge surface of a fourth panel to a non-jointed second axial edge surface thereby producing a tear drop shaped cross-sectional member. The skilled person would understand that by repeating and adapting this procedure the various tear drops shapes found in  FIGS. 12, 14 and 15  can be re-produced. 
     The joint produced by this method is particularly strong and no additional adhesive or glue is required to keep the axial joints together permanently. The axial joints produced by this method are virtually impossible to undo when jointed completely. The butt joints between different plates may include the application  88  of an adhesive in a preferred embodiment. With this simple method of joining axial edge surfaces a very large number variously shaped objects  92  can be produced. The method of claim  16 , further comprising permanently jointing the first and the second panels together to produce an arc length of 240°. 
       FIG. 11  illustrates a perspective view of a method  80  of making a cylindrical object with the a wood laminate semi-cylindrical panels  5  according to a preferred embodiment of the present invention, where the staggering the panels (Shell Lay-Up) is easily visualized, and how the butt joints between panels are never aligned. All the product examples ( FIGS. 12 to 17 ) use this staggering shell lay-up to ensure that butt joints do not adjacently lined-up with one another. This ensures better strength performance, easier alignment of additional shells, and an almost limitless length. 
     The present wood laminate semi-cylindrical panels also relates to a system of combining curved plywood shells to further their utility and create new products such as:
         formwork for a variety of concrete, steel and wood composite slabs. ( FIG. 12 )   a deck, or sandwich panel, of curved and flat plywood. ( FIG. 13 )   a wall system with an undulating surface. ( FIG. 14 )   columns with a simple or complex cross section. ( FIG. 15 )   ductwork for HVAC systems. ( FIG. 16 )   various diameters of culverts for temporary roads, that can be nested one inside the other for transport ( FIG. 17 ).       

     Curved formwork ( FIG. 12 ) has enough strength to span long distances while supporting the weight of wet concrete. The profile of the formwork also lends itself to efficient concrete slab design, maximum depth of concrete with a minimal use of material. In essence, the wood formwork “waves” form concrete beams integral to the concrete slab and thus allow the slab to span further. This invention demonstrates a configuration of formwork that offers several advantages over conventional systems. The formwork will be self-supporting over long spans, it will provide an architectural finish, it offers both concealed and exposed cavities to incorporate services, and it will help control the acoustical performance of an adjacent space. Many possible combinations may be generated by changing the curvature, direction of curve, distance to the focal point and introduction of flat sections having the complementary axial joints required. 
     A lightweight deck, or sandwich panel, ( FIG. 13 ) with a curving surface provides exceptional shear capacity and resistance to bending. The strength potential of such a system is excellent, as demonstrated with another wood based product, corrugated cardboard. The voids created by the undulating wood surface provide concealment, sound control, minimal thermal bridging, and/or architectural interest. These panels may be prefabricated and used as floor, wall, or roof. There is also the possibility with a wall system with panels  5  of the present invention that multiple curved planes can be jointed. 
     A wall system ( FIG. 14 ) with an undulating surface is resistant to force loads applied from multiple directions. This wall system is self-supporting, it relies on the rational placement of material for its structural performance. The curve resists buckling thereby eliminating the need for conventional stud work. 
     Columns ( FIG. 15 ) produced from the shells creates an exceptionally strong construction member. The material is placed far from the neutral axis, thus creating a concealed void in the middle of the member. That void may be used for services, insulation, HVAC or or the addition of steel tension rods. These members may also be used horizontally as beams or diagonally as braces. 
     Curved ductwork ( FIG. 16 ) made from wood has several advantages. Curves facilitate the movement of air with the least frictional drag and turbulence meaning a quieter system that requires less power. Such ductwork could span large distances, is lightweight and easily manipulated with standard tools and techniques. Wood absorbs vibration resulting in a quieter system with less structural born sound as well as less sound transmission through the wall. The natural insulative value of wood helps to resist condensation. Wood is non corrosive, hypoallergenic and nontoxic. Many efficient ductwork profiles can service the design requirements of an HVAC system. In addition, any connector pieces for the ductwork may also be fabricated in wood. 
     Culverts ( FIG. 17 ) are cylinders buried in roads to allow for the passage of water through the road network rather than having water dam on one side of the road. Timber culverts offer an inexpensive, lightweight, strong, durable and environmentally friendly method of providing temporary water management. Onsite fabrication, limitless length and easy disposal give the wood laminate culverts described herein a competitive advantage. 
     The wood laminate semi-cylindrical panels  5  described herein have the following advantages 1) final system assembly, 2) end-use flexibility and 3) natural/green.
         1) System Assembly—The wood laminate semi-cylindrical panels  5  described herein are engineered to create a shell system with predictable performance characteristics. The finger jointed axial edge surfaces  24   a/b  are assembled in an offset manner to allow for greater strength while reducing the load requirements of the butt joints. The axial finger joints are designed to be as strong as any unjointed location of the shell, however most of the joints are further strengthened by the method of assembly. To disassemble, forces would need to be applied in the opposite manner of assembly and the listed products are designed so that such forces are not likely to occur during use. Assembling the pieces in this manner allows for custom lengths, as each new piece is supported and aligned by the pieces already assembled. For example, concrete slab forms may easily be constructed to span 40 feet while culverts may be made at lengths of 20 feet, and columns at perhaps only 10 feet.   2) Flexibility—The repeatability of the 120° wood laminate semi-cylindrical panels  5  described herein allows for system products to be any length when pre-assembled and also offers the opportunity to assemble the panels  5  on site to adjust to terrain, or to building conditions, or to avoid transportation limitations. Wood is easily manipulated with standard tools, adhesives and mechanical fasteners. Curved shells can be added to standard flat wood plywood/laminate to further the library of possible profiles. Curves of a variety of radiuses, focal points, thicknesses and species may all be combined for desired effect.   3) The shell products are made of natural wood and are generally green. As natural wood the panels 5 thus have wood&#39;s many attributes. Wood naturally chars, shells produced at a thickness of 1-¼″ can be classified as heavy timber and thus meet the fire code requirements of a heavy timber building. Wood naturally biodegrades. A culvert of the wood laminate semi-cylindrical panels  5  described herein can be engineered to slowly bio-degrade over 3-10 years, or a building component may easily be disposed of without negative environmental impact. Wood is aesthetically pleasing and allows any of the mentioned products to be specified as an architectural finish. Wood insulates against thermal energy loss. Wood resists vibration resulting in sound absorption. Wood is resilient which helps it resist sudden impact or earthquake conditions. With present environmental stewardship demanding reduced impacts in resource extraction, the biodegradable culvert presents a low cost, viable option for road builders.       

     The scope of the claims set forth here should not be limited by the preferred embodiments set forth in the examples, but should be given the broadest interpretation consistent with the description as a whole.