Bamboo-wood-based stable structure grid body, bamboo-wood-based stable structure grid plate and floor

Abstract

The invention relates to a bamboo-wood-based stable structure grid body which comprises a first bamboo-wood-based composite board and a second bamboo-wood-based composite board, the first bamboo-wood-based composite board and the second bamboo-wood-based composite board are alternately glued and laminated, the plant fiber trend of the first bamboo-wood-based composite board is perpendicular to the bonding surface, and the plant fiber trend of the second bamboo-wood-based composite board is perpendicular to the bonding surface. The plant fiber trend of the second bamboo-wood-based composite board is parallel to the bonding surface; the thickness Q of the second bamboo-wood-based composite board and the thickness B of the adjacent first bamboo-wood-based composite board meet the following relation: Q is more than 0 and less than or equal to 2 * a2 * B, the dry shrinkage rate range of the first bamboo-wood-based composite board in the thickness direction is (a1, a2), and an expansion joint is formed in the first bamboo-wood-based composite board; and the stable grid plate is used as a floor core plate for manufacturing the floor. According to the bamboo-wood-based stable-structure grid body, different dry shrinkage rates and size limitation in different plant fiber directions are fully utilized, floor core plates and door core plates which are stable in structure and not prone to deformation are manufactured, and wide prospects are provided for application of the bamboo-wood-based stable-structure grid body in the fields of floors, door plates and decorative plates.

Description

Technical Field

[0001] The present invention relates to the field of wood-based panels, and particularly to a bamboo-wood based stable structure grid body, a stable structure grid board made of solid wood and bamboo, and a floor containing a bamboo-wood based core board. Background Art

[0002] Solid wood and bamboo are essential raw materials in industries such as furniture and flooring. They have natural solid wood textures and solid wood textures, which are irreplaceable by other materials in home life. Naturally growing trees can be divided into two categories: hardwoods and softwoods. Hardwoods, due to their long growth cycles, limited available yields, and tight wood textures and heavy weights, are often used in the production of high-end furniture. However, for most places, fast-growing woods such as pine are often used as lumber. Fast-growing woods, due to their rapid growth and large and soft plant growth fibers, are prone to deformation and cracking during use, which in turn affects the quality of the wood-based panels. Therefore, how to deal with the deformation and cracking of plants is a problem that the wood industry is striving to solve. Bamboo is a major source of wood-based panels in nature. It has the advantages of fast growth and large quantity. Like solid wood, it also has a natural fiber growth direction and different shrinkage rates in different directions. It is also a key natural material for replacing wood in the future. The application of bamboo alone or in combination with solid wood is an important direction for solving the current source of wood-based panels.

[0003] We pointed out in the invention patent 202310662569.3 that if a composite wood-based panel structure with stable structure and no deformation over time is to be formed, the whole solid wood needs to be broken into pieces to form multiple solid wood blocks, and then the solid wood blocks are spliced into a plate shape, and saw cuts are used to attract internal deformation to maintain the overall structural stability. This structural form has made great progress compared with the prior art. The made solid wood panel structure is relatively stable, and when spliced into the core of a solid wood floor, it is more environmentally friendly than the existing laminated wood and can better control the internal deformation and cracking than the three-layer board of the prior art. However, through practice, there is still room for improvement in its deformation control and shrinkage. Therefore, we have proposed a new concept of the bamboo-wood based stable structure, as well as a stable structure grid board made based on this concept, and considered its practical application in the floor as the floor core board. Summary of the Invention

[0004] The object of the present invention is to solve the problem in the prior art that solid wood boards are prone to deformation and difficult to control after deformation, resulting in overall deformation of the boards. A bamboo-wood based stable structure, a bamboo-wood based stable grid board, and a solid wood floor with a stable structure grid board as the core board are proposed. The bamboo-wood based stable structure, stable structure grid board, stable structure core structure and floor of the present invention should be able to control the deformation amount and overall shrinkage rate, so that the whole becomes a stable structure resistant to deformation, ensuring the structural stability of its use as a core board and other applications, overcoming the defects of soft wood, and providing a guarantee for subsequent large-scale applications.

[0005] In order to achieve the above object of the invention, the present invention patent provides the following technical solutions:

[0006] The present invention firstly innovatively provides a bamboo-wood based stable structure as a dimensionally stable bamboo-wood based structure. The stable structure includes multiple thick laminates bonded together with an adhesive, that is, thin boards are laminated and adhesively bonded to form a thick board. The thick laminate is divided into a first bamboo-wood based composite board and a second bamboo-wood based composite board. The first bamboo-wood based composite board and the second bamboo-wood based composite board are alternately adhesively laminated. The plant fiber direction of the first bamboo-wood based composite board is perpendicular to the bonding surface, and the plant fiber direction of the second bamboo-wood based composite board is parallel to the bonding surface. After adjacent thick laminates are bonded, the adjacent plant fiber directions are perpendicular to each other; the thickness Q of the second bamboo-wood based composite board and the thickness B of the adjacent first bamboo-wood based composite board satisfy the following relationship:

[0007] 0 < Q ≤ 2 * a2 * B

[0008] Wherein, the first bamboo-wood based composite board is a cross-cut board, and the dry shrinkage rate range of the first bamboo-wood based composite board in the thickness direction is (a1, a2).

[0009] In the definition of the above bamboo-wood based composite board, it includes veneers or laminates made of solid wood, veneers or laminates made of bamboo, or composite laminates made of solid wood and bamboo, which are divided into three types. Their common feature is that they are arranged by using the direction of plant growth fibers.

[0010] Based on the bamboo-wood based stable structure, a bamboo-wood based stable grid structure is specially designed. It includes the above-mentioned first bamboo-wood based composite board and second bamboo-wood based composite board. The first bamboo-wood based composite board and the second bamboo-wood based composite board are both multi-layer thick laminates adhesively laminated into one body. The first bamboo-wood based composite board and the second bamboo-wood based composite board are alternately adhesively laminated. The plant fiber direction of the first bamboo-wood based composite board is perpendicular to the bonding surface, and the plant fiber direction of the second bamboo-wood based composite board is parallel to the bonding surface, so that the plant fiber directions are perpendicular to each other after adjacent thick laminates are bonded;

[0011] The thickness Q of the second bamboo-wood based composite board and the thickness B of the adjacent first bamboo-wood based composite board satisfy the following relationship:

[0012] 0 < Q ≤ 2 * a2 * B

[0013] Wherein, the dry shrinkage rate range of the first bamboo-wood based composite board in the thickness direction is (a1, a2);

[0014] A plurality of expansion joints are provided on the first bamboo-wood based composite board, so that the adjacent first bamboo-wood based composite board and the second bamboo-wood based composite board are combined to form a three-dimensional grid shape.

[0015] Furthermore, a plurality of parallel expansion joints along the direction of plant fibers are provided on the first bamboo-wood based composite board. The width of the expansion joint is H, and the distance between adjacent expansion joints is b, then it satisfies: b ≤ 12 mm, 0.1 mm ≤ H ≤ 2 mm; the top end face of the bamboo-wood based stable structure grid body is a soft surface of the grid body stable structure, and the side face with the expansion joint is a hard surface of the grid body stable structure.

[0016] In a bamboo-wood based stable structure grid body of the present invention, the first bamboo-wood based composite board and the second bamboo-wood based composite board are boards containing plant growth fibers, including pure wood multi-layer boards, pure bamboo multi-layer boards, or bamboo-wood composite multi-layer boards.

[0017] In a bamboo-wood based stable structure grid body of the present invention, it includes a first basic unit and a second basic unit. The first basic unit includes a first bamboo-wood based composite board and a second bamboo-wood based composite board. The first bamboo-wood based composite board and the second bamboo-wood based composite board are glued and laminated. The second basic unit includes two first bamboo-wood based composite boards and a second bamboo-wood based composite board. The first bamboo-wood based composite boards on both sides and the second bamboo-wood based composite board in the middle are glued and laminated to form a sandwich structure; the direction of plant fibers of the first bamboo-wood based composite board is perpendicular to the bonding surface, and the direction of plant fibers of the second bamboo-wood based composite board is parallel to the bonding surface, so that the directions of plant fibers are perpendicular to each other after the adjacent thick laminates are bonded. A plurality of parallel expansion joints along the direction of plant fibers are provided on the first bamboo-wood based composite board, and the front face of the first bamboo-wood based composite board with the expansion joint opening is the hard surface of the grid body stable structure.

[0018] Furthermore, in the first basic unit, the first bamboo-wood composite board is further provided with a cross seam intersecting with the expansion joint. The cross seam and the expansion joint appear on the stable structure hard surface of the grid body. A panel is covered on the stable structure hard surface of the first bamboo-wood composite board. The second bamboo-wood composite board is used as a bottom board and is parallel to the panel, which is called a single-layer column core board. According to different thicknesses, the first basic unit can be used as a floor core board or a door core board. The above cross seam and expansion joint intersect at a certain angle, which can be an acute angle or a right angle. The purpose is to fully destroy the connected fibers for space substitution and reduce the actual volume.

[0019] In further applications, the first bamboo-wood composite board of the first basic unit is further provided with a cross seam intersecting with the expansion joint. The hard core surface of the first bamboo-wood composite board is divided into several independent geometric bodies by the expansion joint and the cross seam. Some of the plant growth fibers of the second bamboo-wood composite board are cut off by the expansion joint and the cross seam to form a supporting curved surface. The supporting curved surface with independent geometric bodies is laminated with a surface board provided on a curved surface mold by gluing to form a curved panel, which is called a single-layer curved surface column core board.

[0020] Furthermore, in the second basic unit, the first bamboo-wood composite board is further provided with a cross seam intersecting with the expansion joint. The above cross seam and expansion joint intersect at a certain angle, which can be an acute angle or a right angle. The purpose is to fully destroy the connected fibers for space substitution and reduce the actual volume. The cross seam and the expansion joint appear on the stable structure hard surface of the grid body. Side plates are provided around the second basic unit to form a frame-shear structure. A panel is covered on the stable structure hard surface of the first bamboo-wood composite board, which is called a double-layer column core board. According to different thicknesses, the second basic unit can also be used as a floor core board or a door core board.

[0021] In further applications, the first bamboo-wood composite board of the second basic unit is further provided with a cross seam intersecting with the expansion joint. The hard core surface of the first bamboo-wood composite board is divided into several independent geometric bodies by the expansion joint and the cross seam. Some of the plant growth fibers of the second bamboo-wood composite board are cut off by the expansion joint and the cross seam to form a supporting curved surface. The supporting curved surface with independent geometric bodies is laminated with a surface board provided on a curved surface mold by gluing to form a curved panel, which is called a double-layer curved surface column core board.

[0022] The present invention also provides a bamboo-wood based stable structure grid board, which is a plate-like structure formed by further processing the above-mentioned laminated combination of bamboo-wood based stable structure grid bodies. The plate-like structure includes a plurality of bamboo-wood based stable structure grid bodies and a second bamboo-wood based composite board. The plurality of bamboo-wood based stable structure grid bodies are arranged in rows in the same direction, and the adjacent rows of bamboo-wood based stable structure grid bodies are bonded with the second bamboo-wood based composite board. Moreover, the opening of the expansion joint of each bamboo-wood based stable structure grid body is closely attached to the second bamboo-wood based composite board. The upper surface and the lower surface of the plate-like structure are both combined grid body stable structure soft surfaces containing a plurality of individual grid body stable structure soft surfaces.

[0023] In a bamboo-wood based stable structure grid board of the present invention, the preparation method of the bamboo-wood based stable structure grid board is as follows: a plurality of bamboo-wood based stable structure grid bodies are stacked and placed in layers, and the directions of the expansion joints in the bamboo-wood based stable structure grid bodies placed in the same layer are the same; the bamboo-wood based stable structure grid bodies between adjacent layers are bonded through the second bamboo-wood based composite board, so that one end of the opening of the expansion joint is closely attached to the second bamboo-wood based composite board; the combined and bonded bamboo-wood based stable structure grid bodies are sawn transversely into a plate-like structure, and the upper surface and the lower surface of the plate-like structure are both large-scale grid body stable structure soft surfaces composed of a plurality of individual grid body stable structure soft surfaces.

[0024] Further, the relationship between the second bamboo-wood based composite board in the above-mentioned bamboo-wood based stable structure grid body and the second bamboo-wood based composite board between the bamboo-wood based stable structure grid bodies is as follows:

[0025] If the directions of the plant growth fibers are all the same and all parallel to the grid body stable structure soft surface, it is a front-side bamboo-wood based stable structure grid board;

[0026] If the directions of the plant growth fibers are all the same and all perpendicular to the grid body stable structure soft surface, it is a cross-side bamboo-wood based stable structure grid board;

[0027] If the plant growth fibers are partially the same, that is, the growth fibers of some of the second bamboo-wood based composite boards are perpendicular to the grid body stable structure soft surface and the growth fibers of some of the second bamboo-wood based composite boards are parallel to the grid body stable structure soft surface, then it is an adjusted-side stable structure grid board.

[0028] Further, a functional core layer is also provided in the second bamboo-wood based composite board, and the functional core layer is one or more of a heat-insulating and heat-preserving polyurethane board, a metal plate, a fireproof board, a glass fiber braided layer, and a carbon fiber braided layer.

[0029] Further, the preparation of the bamboo-wood based stable structure grid board includes the following steps:

[0030] First step: Prepare a bamboo-wood based stable structure. First, stack and bond multiple solid wood boards with the same length, width, and the same plant fiber direction together in the thickness direction to form a large glued wood board with the same plant fiber direction. Then, saw the large glued wood board along the width direction to form multiple glued wood columns with equal thickness. Saw a part of the glued wood columns along the width and height directions to form integrated straight-grained boards as the first bamboo-wood based composite boards. Saw the other part of the glued wood columns along the length and height directions to form integrated cross-cut boards as the second bamboo-wood based composite boards. Stack two integrated straight-grained boards and one integrated cross-cut board together and bond them at the contact surfaces to form a stable structure column composed of two first bamboo-wood based composite boards sandwiching one second bamboo-wood based composite board;

[0031] Second step: Saw along the height direction of the stable structure column to form multiple stable structure units in the shape of blocks with equal thickness. In this stable structure unit, the inner sides of the two integrated straight-grained boards on both sides are respectively bonded to both sides of the middle integrated cross-cut board. The plant fibers of the middle integrated cross-cut board are parallel to the bonding surface, and the plant fibers of the two integrated straight-grained boards on both sides are perpendicular to the bonding surface;

[0032] Third step: Use a multi-blade saw to cut multiple expansion joints along the height direction on the stable structure unit. The expansion joints are cut on the integrated straight-grained boards on both sides as the first bamboo-wood based composite boards, and the bottom of the expansion joints is close to the integrated cross-cut board as the second bamboo-wood based composite board;

[0033] Fourth step: Lay an integrated cross-cut board on the operating table. Arrange multiple stable structure units with expansion joints side by side on the integrated cross-cut board and bond them together so that the width of the integrated cross-cut board is equal to the length of the stable structure unit. When arranging, the end faces at the openings of the expansion joints are bonded to one side surface of the integrated cross-cut board. Then, cover another same integrated cross-cut board on the neatly arranged stable structure units and bond them together. By analogy, form several combined grid large boards with stable structure units and integrated cross-cut boards alternating with each other;

[0034] Fifth step: Saw the combined grid large board again along the end face with equal thickness to form a stable structure grid board.

[0035] In a bamboo-wood based stable structure grid board of the present invention, side boards are provided at the edges of the bamboo-wood based stable structure grid board. The formed bamboo-wood based stable structure grid board with a frame is called a frame-shear stable structure grid board.

[0036] Furthermore, in the frame-shear stable structure grid board, the arrangement density of the expansion joints near the middle line part is greater than the arrangement density of the expansion joints near the two side edges.

[0037] The present invention also provides a floor, which contains the above-mentioned bamboo-wood based stable structure grid board. The external dimensions of the bamboo-wood based stable structure grid board are the same as the specifications of a single floor board to serve as the floor core board. An upper surface board is provided above the floor core board, and a lower surface board is provided below the floor core board. The above-mentioned upper surface board and lower surface board are both bonded to the stable structure surface of the large grid body of the bamboo-wood based stable structure grid body.

[0038] For the optimized application of the bamboo-wood based stable structure grid board as the floor core board, the bamboo-wood based stable structure grid board is a frame-shear stable structure grid board. Edge boards are provided around the frame-shear stable structure grid board, forming a fully enclosed structure for the stable structure grid board, so that the floor core board is a product form with stable structure during application. Its specifications are designed according to the size of a single floor board. The middle part is a grid board with a large number of grid structures, and the surrounding are maintenance edge boards.

[0039] For the optimized layout form of the bamboo-wood based stable structure grid board as the floor core board of the frame structure, the density of the expansion joints inside the frame-shear stable structure grid board is greater than that on both sides, and the upper surface board is a solid wood quarter-sawn board or rotary cut board. By setting the law of decreasing density of the expansion joints, when cooperating with the upper surface board, the stability in the middle is greater, and it is less likely to generate stress in the middle and cause deformation.

[0040] Based on the above technical solutions, compared with the prior art, a bamboo-wood based stable structure body, stable structure grid board, stable structure core structure and floor of the present invention have the following technical advantages:

[0041] 1. Based on the requirements of anti-deformation, anti-cracking and low shrinkage rate, the present invention proposes the concept of a stable structure body, covering the application of bamboo-based boards and solid wood boards. According to the characteristics of different plant growth fiber directions and different dry shrinkage rates, the dry shrinkage rate is combined with the external dimensions to make its comprehensive performance meet its application requirements. Specifically, the direction of plant fibers with low dry shrinkage rate is used as the stressed part, and it is used as a support to achieve the purpose of anti-deformation and anti-cracking. The direction with high dry shrinkage rate is used as the elastic part, and holes, seams and grooves are designed in the structure to absorb the deformation caused by the high dry shrinkage rate, so as to realize the stability of the overall dimensions, and ensure the long-term stability of the external shape through the absorption of deformation inside.

[0042] 2. The stable structure of the present invention has the smallest dry shrinkage rate in the surface thickness direction through a unique arrangement setting method and dry shrinkage rate ratio, and uses expansion joints to reduce the actual width of the first bamboo-wood based composite board. Through the setting of expansion joints, the dry shrinkage rate in the surface width direction of the stable structure body is the smallest, and the stable structure body surface has the same shrinkage size, so as to maintain the same shrinkage stress on the surface of the stable structure body, while in the thickness and width directions, the shrinkage sizes are kept consistent, so that the overall expansion and contraction of the stable structure body have consistency, making the length and width directions of the manufactured floor core board expand and contract uniformly, and the upper and lower surfaces remain stable and unchanged.

[0043] 3. For the stable structure unit, in order to maintain its overall dimensional stability, deformation absorption structures including expansion joints are provided on the stable structure, so that the deformation caused by dry shrinkage is absorbed by the expansion joints, and thus the deformation in the direction with a larger deformation amount is absorbed by the expansion joints, so that the overall stable structure unit remains stable. The expansion joints are provided along the plant growth fiber direction of the first bamboo-wood composite board, and multiple parallel expansion joints are provided, so that the dry shrinkage rate in the width direction perpendicular to the plant growth fiber direction of the first bamboo-wood composite board becomes smaller, thereby increasing the stability in the width direction.

[0044] 4. For the stable structure unit with anti-deformation characteristics, one of its very important applications is as the core board of the floor. The stable structure grid board forms an equal-thickness strip-shaped core board structure through the side plates on both sides, as a frame-shear type stable structure grid board structure. This strip-shaped core board structure is closely laid flat to form a floor core board. This floor core board is bonded with the bottom board and the surface board to form a solid wood floor. By forming the solid wood into a stable structure form, the deficiencies of large dry shrinkage rates of softwoods such as Chinese fir and pine are overcome, and internal deformation is absorbed to maintain surface stability, providing a broad prospect for the application of solid wood in the floor aspect, and greatly reducing the cost of solid wood floors.

[0045] 5. The present invention uses the provision of expansion joints to divide the combination of the first bamboo-wood composite board and the second bamboo-wood composite board into two basic units, that is, one first bamboo-wood composite board is adhesively fixed to one second bamboo-wood composite board. Expansion joints are provided on the first bamboo-wood composite board, and the side surface with the expansion joints is called the grid body stable structure hard surface. The plant fiber growth direction on the first bamboo-wood composite board is perpendicular to this grid body stable structure hard surface. By providing multiple expansion joints and cross joints on the first bamboo-wood composite board, a stable plate form is formed. If the thickness is sufficient, it can be used as a door core board or other decorative panel materials by covering the surface board, with the characteristics of strong support and not easy to deform. And it can also be made lightweight by grooving. If the thickness is controlled and the second bamboo-wood composite board is used as the floor and the surface board is used as the upper surface board of the floor, a floor structure with stable structure and strong support is formed. Another is to form a sandwich structure by clamping one second bamboo-wood composite board with two first bamboo-wood composite boards. By providing multiple expansion joints and cross joints on the first bamboo-wood composite board, a stable plate form is formed, and it can also be used as a door core board or other decorative panel materials by covering the surface board.

[0046] 6. In the stable structure grid body of the present invention, the expansion joints and cross joints are cut from the first bamboo-wood based composite board to the second bamboo-wood based composite board, so that the plant growth fibers on the second bamboo-wood based composite board are partially cut off, thereby generating a plurality of independent geometric bodies on the first bamboo-wood based composite board and forming a supporting curved surface on the second bamboo-wood based composite board. Through the coordinated use of molds for shaping and laminating and gluing with a deformable surface board, a single-layer or double-layer curved surface column core board is formed, thus obtaining a further application of the stable structure grid body, which can be used as a board with arbitrary deformation and is suitable for various occasions with curved surface requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a top view schematic diagram of the structural composition of a stable structure unit of the present invention.

[0048] Figure 2 It is a three-dimensional structure schematic diagram of a stable structure unit of the present invention.

[0049] Figure 3 It is a schematic diagram of the glued large wood board in the present invention.

[0050] Figure 4 It is a schematic diagram of the glued wood column formed by decomposing the glued large wood board in the present invention.

[0051] Figure 5 It is a schematic diagram of the integrated straight grain board formed by longitudinally decomposing the glued wood column in the present invention.

[0052] Figure 6 It is a schematic diagram of the integrated cross-cut board formed by horizontally decomposing the glued wood column in the present invention.

[0053] Figure 7 It is a schematic diagram of the stable structure formed by the integrated straight grain board and the integrated cross-cut board in the present invention.

[0054] Figure 8 It is a schematic diagram of the stable structure unit formed by decomposing the stable structure in the present invention.

[0055] Figure 9 It is a schematic diagram of the preparation process of the stable structure core board structure in the present invention.

[0056] Figure 10 It is a schematic diagram of the composition unit of the stable structure grid board in the present invention.

[0057] Figure 11 It is a schematic diagram of the expansion joint processing of a stable column in a form of the present invention.

[0058] Figure 12 It is a schematic diagram of the processing of a longitudinal expansion joint on a stable column in the present invention at an angle.

[0059] Figure 13It is a processing schematic diagram of the longitudinal expansion joint on the stable structure column in the present invention from another angle.

[0060] Figure 14 It is a schematic diagram of the combination of the component units of the stable structure grid board in the present invention.

[0061] Figure 15 It is a schematic diagram of the completed state of the stable structure grid board in the present invention. Specific embodiments

[0062] Next, we will further elaborate on a deformation-resistant bamboo and wood-based stable structure and bamboo and wood-based core board of the present invention in combination with the accompanying drawings and specific embodiments, in order to more clearly understand its structural composition and working mode, but the protection scope of the present invention cannot be limited thereby.

[0063] The present invention constructs a large class of structural types of bamboo and wood-based boards as a whole, so as to give full play to the performance advantages of solid wood. Based on the plant growth fiber direction of trees, it avoids or overcomes its performance disadvantages, and opens up a broad world for the application of solid wood and bamboo and wood.

[0064] As Figure 1 and Figure 2 shown, the present invention first provides a concept of a bamboo and wood-based stable structure, and processes solid wood boards, or bamboo, or bamboo and wood composite materials into a structure-stable and deformation-resistant structure body. The bamboo and wood-based stable structure includes multiple layers of thick laminates bonded together with an adhesive. The thick laminates are divided into two types: the first bamboo and wood-based composite board 1 and the second bamboo and wood-based composite board 2. Both types belong to laminates, and the materials can be the same or different. The first bamboo and wood-based composite board 1 and the second bamboo and wood-based composite board 2 are alternately bonded and laminated. The plant fiber direction of the first bamboo and wood-based composite board 1 is perpendicular to the bonding surface, and the plant fiber direction of the second bamboo and wood-based composite board 2 is parallel to the bonding surface. After adjacent thick laminates are bonded, the adjacent plant fiber directions are perpendicular to each other. In addition, in terms of dimensional relationship, the thickness Q of the second bamboo and wood-based composite board 2 and the thickness B of the adjacent first bamboo and wood-based composite board 1 satisfy the following relationship:

[0065] 0 < Q ≤ 2 * a2 * B

[0066] Among them, the dry shrinkage rate range of the first bamboo and wood-based composite board in the thickness direction is (a1, a2), that is, the dry shrinkage rate is greater than the value of a1 and less than the value of a2. The top end face of the bamboo and wood-based stable structure grid body is defined as the soft surface of the grid body stable structure, and the side face with the expansion joint is defined as the hard surface of the grid body stable structure.

[0067] In the above-mentioned bamboo-wood based stable structure, the first bamboo-wood based composite board and the second bamboo-wood based composite board are laminated boards containing plant growth fibers, which can be pure wood multi-layer boards, or pure bamboo multi-layer boards, or bamboo-wood composite multi-layer boards. For bamboo-wood based stable structures, or bamboo stable structures, or solid wood stable structures, they are usually laminated boards made of multi-layers of solid wood. Of course, it can also be a single solid wood board, but usually the size specifications do not meet the requirements, otherwise it will limit the source of materials. The most crucial point of the bamboo-wood based stable structure is to combine at least two laminated boards together, and the directions of the plant growth fibers of the two should be perpendicular, and the direction of the plant growth fibers should be combined and evaluated with the bonding surface of the two. The same rule applies to bamboo, or when bamboo and solid wood are combined as the material source, their arrangement rules are the same. By arranging the plant growth fibers vertically, the strong supporting force and small shrinkage rate of the plant growth fibers perpendicular to the bonding surface are fully utilized, increasing the stability of the grid body stable soft surface.

[0068] For the above-mentioned bamboo-wood based stable structure or bamboo stable structure, its structural composition is special, and there are various preparation processes for this bamboo-wood based stable structure. Taking solid wood as an example, one of the preparation processes for the bamboo-wood based stable structure is as follows:

[0069] First step, stack and glue-laminate multiple solid wood boards with the same length, the same width and the same plant fiber direction in the thickness direction to form a glued large solid wood board with the same plant fiber direction, as Figure 3 shown. After this glued large solid wood board is turned 90 degrees, the directions of the plant fibers are the same, and its upper and lower surfaces form planes due to the same width. Of course, this plane can also be processed smoother by planing or grinding to form multiple glued large solid wood boards with unified specifications for subsequent processing operations.

[0070] Second step, as Figure 4 shown, saw the glued large solid wood board along the width direction to form multiple glued solid wood cylinders with equal thickness. In this glued solid wood cylinder, the direction of the plant fibers is perpendicular to the height direction, and at the end face of the glued solid wood cylinder, the direction of the plant fibers is parallel to the length direction of the glued solid wood cylinder and perpendicular to the width direction of the glued solid wood cylinder. The glued solid wood cylinder is used as the basis for subsequent processing of the first bamboo-wood based composite board and the second bamboo-wood based composite board.

[0071] Third step, as Figure 5 shown, saw a part of the glued solid wood cylinder along the width direction and the height direction to form an integrated straight-grained board as the first bamboo-wood based composite board. In the integrated straight-grained board, the direction of the plant fibers is perpendicular to the upper and lower surfaces on both sides, that is, the directions of the plant fibers in the integrated straight-grained board are all parallel to the thickness direction.

[0072] Fourth step, as Figure 6As shown, another part of the glued wood column is sawn along the length and height directions to form an integrated cross-cut board as a second bamboo-wood-based composite board, in which the direction of the plant fibers is parallel to the upper and lower side surfaces, that is, the direction of the plant fibers in the integrated cross-cut board is perpendicular to the thickness direction.

[0073] Step 5: Figure 7 As shown, two integrated straight-grained boards and one integrated cross-cut board are stacked together and bonded at the contact surface to form a stable column consisting of two first bamboo-wood-based composite boards sandwiching a second bamboo-wood-based composite board, in which the plant fiber direction of the integrated straight-grained boards on both sides of the stable column is perpendicular to the plant fiber direction of the integrated cross-cut boards, and one end of the plant fiber of the integrated straight-grained boards on both sides is respectively perpendicular to the two side surfaces of the integrated cross-cut boards and contacts each other.

[0074] Step 6: Figure 8 The stabilizing column is sawn along the height direction to form a plurality of block-shaped stabilizing body units of equal thickness, in which the inner side surfaces of the integrated straight-grained plates on both sides are respectively connected to the two sides of the middle integrated cross-cut plate, the plant fibers of the middle integrated cross-cut plate are parallel to the bonding surface, and the plant fibers of the integrated straight-grained plates on both sides are perpendicular to the bonding surface.

[0075] The above process can be Figure 9 It is shown in detail in the figure, reflecting the difference from the existing process. Under the new bamboo-based stabilizing structure concept and idea, taking the solid wood board as an example, each stabilizing structure unit becomes an independent structure. After designing the upper and lower surface boards, multiple stabilizing structure units are laid flat and spliced ​​on the lower surface board to form a core board, and then the upper surface board is covered and bonded, thereby forming a composite solid wood board structure with a stable structure and not easy to deform. The solid wood board structure is broken down into parts, making full use of the direction of plant growth fibers, and through the adjustment of the direction and the application of shrinkage rate, considering the relationship between shrinkage rate and corresponding size, the deformation is accurately controlled, and the composite solid wood board structure is stable and reliable.

[0076] As the most commonly used stable structure form, the bamboo-wood based stable structure is composed of three thick laminates to form a basic unit. The first bamboo-wood based composite board 1 and the second bamboo-wood based composite board 2 are bonded and glued to form the basic unit of the stable structure. This basic unit is formed by sandwiching one second bamboo-wood based composite board 2 between two first bamboo-wood based composite boards 1 to form a laminated large board. In addition, there is also a case where the basic unit of the bamboo-wood based stable structure is composed of two thick laminates. The first bamboo-wood based composite board and the second bamboo-wood based composite board are bonded and glued to form the basic unit of the stable structure. This basic unit is formed by laminating one second bamboo-wood based composite board against one first bamboo-wood based composite board, but it is required that the direction of the plant growth fibers of the first bamboo-wood based composite board is perpendicular to the bonding surface. In terms of dimensions, the length of the first bamboo-wood based composite board 1 occupies a relatively large proportion of the dimensions, so that the deformation amount in one direction of the surface can be controlled, and the deformation amount in the other direction can be controlled by being perpendicular to the surface board, making full use of the direction of the plant fibers of the tree. Thus, a stable structure with controllable deformation amount is formed in one direction, so it is called a bamboo-wood based stable structure. And for the other direction perpendicular to it, subsequent expansion joints need to be operated to control the dry shrinkage rate, so as to achieve a stable structure with controllable overall deformation. According to common knowledge of trees, for a tree, the anti-deformation ability in the direction of plant fibers is ten times or more than that in the side deformation direction. Therefore, in daily applications, the tree growth direction is always used as the direction of the supporting force, which can bear pressure and tension, that is, "one piece of wood can withstand a thousand catties".

[0077] Based on the bamboo-wood based stable structure, the present invention also provides a bamboo-wood based stable structure grid body as an intermediate product, which includes a first bamboo-wood based composite board 1 and a second bamboo-wood based composite board 2. Both the first bamboo-wood based composite board 1 and the second bamboo-wood based composite board 2 are multi-layer thick laminates glued and laminated together. The first bamboo-wood based composite board 1 and the second bamboo-wood based composite board 2 are alternately glued and laminated. The direction of the plant fibers of the first bamboo-wood based composite board 1 is perpendicular to the bonding surface, and the direction of the plant fibers of the second bamboo-wood based composite board 2 is parallel to the bonding surface, so that the directions of the plant fibers are perpendicular to each other after the adjacent thick laminates are bonded; based on this bamboo-wood based stable structure, it is necessary to limit the size specifications according to the dry shrinkage rate of the tree, so as to obtain dimensional stability in one direction. Specifically, in the bamboo-wood based stable structure, the thickness Q of the second bamboo-wood based composite board 2 and the thickness B of the adjacent first bamboo-wood based composite board 1 satisfy the following relationship:

[0078] 0 < Q ≤ 2 * a2 * B

[0079] Wherein, the dry shrinkage rate range of the first bamboo-wood based composite board in the thickness direction is (a1, a2).

[0080] The above shrinkage rate refers to the proportion of the size reduction of trees (wood) during the drying process due to the reduction of moisture. For wood, the ratio of the shrinkage size along the wood grain direction to the original size is relatively small, only 0.1%-0.3%, which is called the longitudinal shrinkage rate; the transverse shrinkage rate is further divided into the radial shrinkage rate and the tangential shrinkage rate. The radial shrinkage rate is the ratio of the shrinkage size along the diameter direction on the cross-section to the original radial size, usually 3%-6%. The tangential shrinkage rate is the ratio of the shrinkage size along the tangent direction of the annual ring to the original tangential size, with a value of 6%-13%, which is 1-2 times the radial shrinkage rate. The above longitudinal shrinkage rate and transverse shrinkage rate are linear shrinkage rates. In addition, there is also the volume shrinkage rate, which refers to the ratio of the reduction amount after wood drying to the original volume, usually varying between 1%-12%. Similarly, there is also the rule that the shrinkage rate along the wood grain direction is small. The internal stress caused by shrinkage deformation is called the shrinkage force, which will cause phenomena such as warping, deformation, and cracking of wood, affecting the processing and use performance of wood. The bamboo-wood-based stable structure takes into account the shrinkage rate concept, considering the shrinkage rate and the shrinkage size in relation to the original size, and proposes the corresponding relationship between the thickness of the solid wood board and the directions of different plant fibers, so as to minimize the shrinkage rate along the direction of the plant fiber, control the deformation amount and the shrinkage force of the bamboo-wood-based stable structure in this direction, and achieve no deformation.

[0081] After controlling the deformation in one direction (along the plant growth fiber direction of the first bamboo-wood-based composite board), it is necessary to control the deformation amount in the vertical direction, so as to ensure that the bamboo-wood-based stable structure is in a stable state with small deformation amounts both longitudinally and transversely. The specific operation method is to provide a plurality of expansion joints on the first bamboo-wood-based composite board 1, and it is required that the direction of the expansion joints is along the plant growth fiber direction, so that the adjacent first bamboo-wood-based composite board 1 and the second bamboo-wood-based composite board 2 are combined to form a three-dimensional grid shape. The purpose of providing the expansion joints is to enable the first bamboo-wood-based composite board 1 to reduce its size in the width direction, that is, to form a comb-like structure through a plurality of parallel expansion joints, thereby reducing the actual width of the first bamboo-wood-based composite board 1, and thus reducing the wood expansion and contraction amount in the direction perpendicular to the plant fiber direction. In the most typical application, a plurality of parallel expansion joints along the plant fiber direction are provided on the first bamboo-wood-based composite board. The width of the expansion joint itself is H, and the distance between adjacent expansion joints is b, then it satisfies: b ≤ 12 mm, 0.1 mm ≤ H ≤ 2 mm; the top end face of the bamboo-wood-based stable structure grid body is the soft surface of the grid body stable structure, and the side face with the expansion joint is the hard surface of the grid body stable structure.

[0082] After providing the expansion joints on the first bamboo-wood-based composite board, the top end face of the bamboo-wood-based stable structure grid body is the soft surface of the grid body stable structure, and the side face with the expansion joint is the hard surface of the grid body stable structure. In Figure 12 and Figure 13Among them, the grid body stable structure hard surface is marked with label M, and the grid body stable structure soft surface is marked with label N.

[0083] After being prepared into a stable and reliable bamboo-wood-based stable structure grid body, it is developed and applied according to the different properties of the grid body stable structure soft surface N and the grid body stable structure hard surface M. For the grid body stable structure hard surface M, it is divided into two forms: the first basic unit and the second basic unit. The first basic unit includes a first bamboo-wood-based composite board and a second bamboo-wood-based composite board. The first bamboo-wood-based composite board and the second bamboo-wood-based composite board are glued and laminated. The second basic unit includes two first bamboo-wood-based composite boards and a second bamboo-wood-based composite board. The first bamboo-wood-based composite boards on both sides and the second bamboo-wood-based composite board in the middle are glued and laminated to form a sandwich structure; the plant fiber direction of the first bamboo-wood-based composite board is perpendicular to the bonding surface, and the plant fiber direction of the second bamboo-wood-based composite board is parallel to the bonding surface, so that the plant fiber directions are perpendicular to each other after the adjacent thick laminates are bonded. A plurality of parallel expansion joints are arranged along the plant fiber direction on the first bamboo-wood-based composite board. The front surface of the first bamboo-wood-based composite board with the expansion joint opening is the grid body stable structure hard surface. Figure 13 The M surface shown in the figure faces the observer and is defined as the front surface of the first bamboo-wood-based composite board. However, in other placement methods, it may not face the observer, but it is the surface where the expansion joint opening is located.

[0084] In the first basic unit, cross joints intersecting with the expansion joints may be provided on the first bamboo-wood-based composite board. The cross joints and the expansion joints appear on the grid body stable structure hard surface. A panel is covered on the grid body stable structure hard surface of the first bamboo-wood-based composite board. The second bamboo-wood-based composite board is used as the bottom plate and is parallel to the panel. This structural form is called a single-layer column core board. After the first basic unit is made into a single-layer column core board, it can be used as a floor core board or a door core board according to different thicknesses. In the formation of a floor core board product or a door core board product, there may be multiple basic units, and multiple first bamboo-wood-based composite boards are bonded and fixed on the same second bamboo-wood-based composite board. In this way, in addition to the expansion joints and cross joints it has, there are also gaps between adjacent first bamboo-wood-based composite boards, and the expansion joint directions of adjacent first bamboo-wood-based composite boards can be parallel or perpendicular.

[0085] In the first basic unit, a cross seam intersecting with the expansion joint is further provided on the first bamboo-wood based composite board. The grid body stable structure hard surface of the first bamboo-wood based composite board is divided into several independent geometric bodies by the expansion joint and the cross seam. Part of the plant growth fibers of the second bamboo-wood based composite board are cut off by the expansion joint and the cross seam to form a supporting bending surface. The supporting bending surface with independent geometric bodies is placed on a curved surface mold. The grid body stable structure hard surface forms the same curved surface as the curved surface mold. A bendable surface board is covered on the grid body stable structure hard surface and laminated by gluing to form a curved surface board, which is called a single-layer curved surface column core board. The single-layer curved surface column core board can be applied to curved surface or column surface decorative boards. A curved surface template can be made according to the requirements of the curved surface. By using the arbitrary bending performance of the supporting bending surface, it can drive the first bamboo-wood based composite board that has become an independent geometric body to bend into the required curved surface shape as needed, and then through the bendable surface board, so as to obtain a single-layer curved surface column core board with the required curved surface shape. Here, the single layer means that there is only one bendable surface board corresponding to a single first bamboo-wood based composite board.

[0086] In the second basic unit, a cross seam intersecting with the expansion joint is further provided on the first bamboo-wood based composite board. The above cross seam intersects with the expansion joint at a certain angle, which can be an acute angle or a right angle. The cross seam and the expansion joint appear on the grid body stable structure hard surface. Side plates are provided around the second basic unit to form a frame-shear structure. A face plate is covered on the grid body stable structure hard surface of the first bamboo-wood based composite board, which is called a double-layer column core board. The double-layer column core board can also be used as a floor core board or a door core board according to different thicknesses.

[0087] In a further application of the second basic unit, the first bamboo-wood composite board of the second basic unit is further provided with a cross seam intersecting with the expansion joint. The hard core surface of the first bamboo-wood composite board is divided into several independent geometric bodies by the expansion joint and the cross seam. Part of the plant growth fibers of the second bamboo-wood composite board are cut off by the expansion joint and the cross seam to form a supporting curved surface. The second basic unit contains two first bamboo-wood composite boards, which are respectively glued and fixed on two surfaces of a second bamboo-wood composite board. Since the two first bamboo-wood composite boards have been divided into several independent geometric bodies by the expansion joint and the cross seam, and the second bamboo-wood composite board has been made into a supporting curved surface, the grid body stable structure hard surface of one of the first bamboo-wood composite boards can be placed on a bendable surface board, and the bendable surface board is arranged in a curved surface mold to construct the required curved surface shape by using the mold. Correspondingly, the grid body stable structure hard surface of the other first bamboo-wood composite board on the second bamboo-wood composite board also presents the same curved surface shape. At this time, another bendable surface board is covered on the grid body stable structure hard surface of the first bamboo-wood composite board, and two bendable surface boards and the second basic unit are laminated and glued to form a curved panel by bonding two bendable surface boards and the second basic unit, which is called a double-layer curved surface column core board. Since there are two bendable surface boards, it is called a double-layer column core board, which can be applied to curved surface or column surface decorative boards to meet the production requirements of any curved surface decorative board.

[0088] A functional core layer is also provided in the second bamboo-wood composite board. The functional core layer is one or more of a heat-insulating and heat-preserving polyurethane board, a metal board, a fire-proof board, a glass fiber woven layer, and a carbon fiber woven layer. By setting the functional core layer, on the one hand, the stability can be increased, and the structure of the laminated board can also be enriched to provide properties such as heat insulation and fire resistance. Taking the double-layer column core board as an example, if a functional core layer such as a heat-insulating and heat-preserving polyurethane board is added to the second bamboo-wood composite board, the double-layer column core board will also increase its function and become a double-layer heat-preserving column core board.

[0089] In the first basic unit and the second basic unit, for the expansion joint and the cross seam provided on the first bamboo-wood composite board, the above-mentioned cross seam intersects with the expansion joint at a certain angle, which can be an acute angle or a right angle. If it intersects at a right angle, it will become an expansion joint intersecting vertically and horizontally in a cross shape, aiming to fully destroy the connected fibers for space substitution and reduce the actual volume.

[0090] When the first basic unit and the second basic unit are made into a floor core board, a door core board or a decorative core board, there is another situation. That is, there is only one second bamboo-wood based composite board, and there are multiple first bamboo-wood based composite boards adhesively laminated and fixed on the second bamboo-wood based composite board. Moreover, the expansion joints on the first bamboo-wood based composite board run along the direction of plant growth fibers longitudinally, but can be parallel or partially parallel and partially perpendicular transversely. And there are also gaps between adjacent first bamboo-wood based composite boards, which can also be regarded as expansion joints. This provides a more practical production process idea for generating large-sized stable structure grid board products with stable dry shrinkage properties.

[0091] The above-mentioned bamboo-wood based stable structure grid board structure mainly processes expansion joints on the first bamboo-wood based composite board 1. The expansion joints are opened along the direction of plant growth fibers and extend to the second bamboo-wood based composite board 2, or partially penetrate the second bamboo-wood based composite board 2 to damage the growth fibers of the second bamboo-wood based composite board 2. As the final application form, the bamboo-wood based stable structure grid board needs to first produce a bamboo-wood based stable structure grid body, and then further process the bamboo-wood based stable structure grid body to form the final bamboo-wood based stable structure grid board that can be used as a core board. The so-called bamboo-wood based stable structure grid body is specifically processed with expansion joints on the basis of the stable structure column body, so as to achieve transverse damage to the plant growth fibers of the first bamboo-wood based composite board and the second bamboo-wood based composite board, causing multiple interruptions of the plant growth fibers, thereby inhibiting their deformation.

[0092] During the production process of the bamboo-wood based stable structure grid body, it is carried out in two cases: The first case is to open expansion joints on the T-shaped structure formed by vertically bonding one first bamboo-wood based composite board and one second bamboo-wood based composite board. Specifically, longitudinal expansion joints are opened on the first bamboo-wood based composite board, such as Figure 11 ; The second case is to open expansion joints on the stable structure formed by clamping one second bamboo-wood based composite board between two first bamboo-wood based composite boards. Specifically, longitudinal expansion joints are also opened on the two opposite first bamboo-wood based composite boards, such as Figure 10 shown, thus forming two structural types of bamboo-wood based stable structure grid bodies.

[0093] In practice, the stable structure column body composed of two first bamboo-wood based composite boards clamping one second bamboo-wood based composite board is the most common basis for making solid wood grid bodies. The processing of its expansion joints is as Figure 10 、 Figure 12 and Figure 13 shown, following the following rules:

[0094] (1) The plant growth fibers of the first bamboo-based composite board on the stable structure column are perpendicular to the gluing and laminating surface of the first and second bamboo-based composite boards. The plant growth fibers of the second bamboo-based composite board are parallel to the gluing and laminating surface of the first and second bamboo-based composite boards. The gluing and laminating surface of the first and second bamboo-based composite boards is parallel to the height direction of the stable structure column. However, the plant growth fibers of the second bamboo-based composite board may be parallel to the height direction of the stable structure column or perpendicular to the height direction of the stable structure column. Most commonly, they are parallel to the height direction of the stable structure column.

[0095] (2) The opening of the expansion joint is usually achieved by splitting the first bamboo-based composite board on the stable structure column. The expansion joints are opened from both sides by splitting the first bamboo-based composite board on the stable structure column. The depth of the expansion joint generally reaches the second bamboo-based composite board, as Figure 10 shown. The purpose of opening the expansion joint on the first bamboo-based composite board is to reduce the width of the first bamboo-based composite board, thereby reducing the dry shrinkage amount in its width direction and also reducing the weight of the entire stable structure column. Specifically, multiple parallel expansion joints are processed by splitting with multiple saws, as Figure 12 and Figure 13 shown. The opened expansion joints exist in the form of splitting on the first bamboo-based composite board and are arranged parallel to the height direction of the stable structure column, which is called the longitudinal expansion joint.

[0096] (3) On the basis of opening the longitudinal expansion joint, since the second bamboo-based composite board is still a whole piece of board, it may cause deformation and bending because its plant growth fibers are still intact and may deform due to temperature and humidity changes. Therefore, measures need to be taken to damage some of the plant growth fibers on the second bamboo-based composite board so that it exists in a segmented manner, thereby reducing its deformation amount. Specifically, the opening depth of some longitudinal expansion joints is extended so that it passes through the second bamboo-based composite board to reach the opposite first bamboo-based composite board, forming an over-opened expansion joint, so as to achieve the purpose of cutting off the plant growth fibers on the second bamboo-based composite board.

[0097] (4) In addition to the longitudinal expansion joints parallel to the height direction of the stable structure column, transverse expansion joints also need to be opened. Here, the transverse expansion joint is also a special form of the cross joint, but it is opened perpendicular to the longitudinal expansion joint, that is, the cross angle is a right angle. Specifically, multiple transverse expansion joints are opened on the first bamboo-based composite board along the direction perpendicular to the longitudinal expansion joint. This can reduce the possibility of the stable structure column bending and further reduce the overall weight of the stable structure column to achieve lightweight.

[0098] As Figure 10 and Figure 15As shown, in practical applications, the bamboo-wood based stable structure is the foundation of the bamboo-wood based stable structure grid body, and at the same time, the bamboo-wood based stable structure grid body is the foundation of the bamboo-wood based stable structure grid board. In practical applications, mainly multiple stable structure grid bodies are processed to form stable structure grid boards one by one. In production practice, the preparation of the bamboo-wood based stable structure grid board includes the following steps:

[0099] First step, prepare the bamboo-wood based stable structure. First, stack and bond multiple solid wood boards with the same length, the same width and the same plant fiber direction together in the thickness direction to form a glued large wood board with the same plant fiber direction. Then saw the glued large wood board along the width direction to form multiple glued wood cylinders with equal thickness. Saw a part of the glued wood cylinders along the width direction and the height direction to form an integrated straight-grained board as the first bamboo-wood based composite board. Saw the other part of the glued wood cylinders along the length direction and the height direction to form an integrated cross-cut board as the second bamboo-wood based composite board. Stack two integrated straight-grained boards and one integrated cross-cut board together and bond and glue them at the contact surface to form a stable structure column composed of two first bamboo-wood based composite boards sandwiching a second bamboo-wood based composite board;

[0100] Second step, saw along the height direction of the stable structure column to form multiple stable structure units in the shape of blocks with equal thickness. In this stable structure unit, the inner sides of the two integrated straight-grained boards on both sides are respectively bonded to both sides of the middle integrated cross-cut board. The plant fiber of the middle integrated cross-cut board is parallel to the bonding surface, and the plant fibers of the two integrated straight-grained boards on both sides are perpendicular to the bonding surface;

[0101] Third step, use a multi-blade saw to cut multiple expansion joints along the height direction on the stable structure unit. The expansion joints are cut on the integrated straight-grained boards on both sides as the first bamboo-wood based composite board, and the bottom of the expansion joints is close to the integrated cross-cut board as the second bamboo-wood based composite board.

[0102] Fourth step, lay an integrated cross-cut board on the operating table, place multiple stable structure units with expansion joints side by side on the integrated cross-cut board and bond them together so that the width of the integrated cross-cut board is equal to the length of the stable structure unit. When stacking, the end face of the opening of the expansion joint is bonded to one side surface of the integrated cross-cut board. Then cover another same integrated cross-cut board on the neatly stacked stable structure units and bond them together. And so on to form several combined grid large boards with stable structure units and integrated cross-cut boards alternating. In this step, the direction of the expansion joint can be adjusted to see whether it is stacked perpendicular or parallel to the integrated cross-cut board, or partially parallel and partially perpendicular. Finally, it presents whether the expansion joints are parallel to each other or partially parallel and partially perpendicular.

[0103] Fifth step, saw the combined grid large board again along the end face with equal thickness to form a stable structure grid board.

[0104] As can be seen from the above steps, the bamboo-wood based stable structure grid board as the final formed product is a plate-like structure made by combining bamboo-wood based stable structures and then further transversely cutting and processing. This plate-like structure includes a plurality of bamboo-wood based stable structures and a second bamboo-wood based composite board. Here, the second bamboo-wood based composite board is located between the first basic unit and the first basic unit, or between the first basic unit and the second basic unit, or between the second basic unit and the second basic unit. Its material can also be a solid wood board, a bamboo board, a bamboo-wood board or other fiber-containing material boards. A plurality of bamboo-wood based stable structures are arranged in rows in the same direction, and the second bamboo-wood based composite board is bonded between adjacent rows of bamboo-wood based stable structures. And the opening of the expansion joint of each bamboo-wood based stable structure is closely attached to the second bamboo-wood based composite board. The upper surface and the lower surface of the plate-like structure are both large grid body stable surfaces containing a plurality of individual grid body stable surfaces.

[0105] In the bamboo-wood based stable structure grid board, there is a second bamboo-wood based composite board among the bamboo-wood based stable structure grid bodies, and the bamboo-wood based stable structure grid bodies are also bonded and fixed through the second bamboo-wood based composite board, having the following relationships and types:

[0106] If the directions of the plant growth fibers are all the same and all parallel to the stable soft surface of the grid body, it is a front bamboo-wood based stable structure grid board;

[0107] If the directions of the plant growth fibers are all the same and all perpendicular to the stable soft surface of the grid body, it is a transverse bamboo-wood based stable structure grid board;

[0108] If some of the plant growth fibers are the same, that is, the growth fibers of some of the second bamboo-wood based composite boards are perpendicular to the stable soft surface of the grid body, and the growth fibers of some of the second bamboo-wood based composite boards are parallel to the stable soft surface of the grid body, then it is an adjusted surface stable structure grid board.

[0109] The present invention designs the technical main line of stable structure → grid body → grid board, and fully explores the unique physical properties of the growth fiber direction of wood or bamboo in the application of the grid board: the shrinkage rate in the fiber growth direction is the smallest, the swelling in the wet state is the smallest, the bearing capacity is the largest, the bending stress resistance is the largest, the tensile stress and the compressive stress are the largest and many other characteristics. Using it as the main material, the first bamboo-wood based composite board is glued with the auxiliary material, the second bamboo-wood based composite board, to form a stable structure with mutually perpendicular fibers and reshape the stable structure. The first bamboo-wood based composite board is provided with expansion joints and cross joints in two directions to form a grid shape to achieve adjustable shrinkage rates in three directions: the volume shrinkage rate of the wood is greater than that of the chord direction of the wood board, and the radial shrinkage rate is greater than the shrinkage rate of the wood fiber direction. The three variable values become similar or equal:

[0110] 1. A number of expansion joints are arranged in the growth fiber direction of the first bamboo-wood based composite board to control the thickness of all the joints and adjust the shrinkage rate in this direction to be the smallest. The shrinkage rates in the length and width directions formed by the first bamboo-wood based composite board and the second bamboo-wood based composite board can be adjusted to the smallest.

[0111] II. The stable structure network body realizes that the total volume of the first bamboo-wood based composite board and the second bamboo-wood based composite board can be adjusted after the expansion joints are opened. By applying the width and density of the slits, the volume of the network body can be controlled, and the maximum deformation is overcome: the dry shrinkage rate of the volume is controlled within the minimum range, and the core size of the network body structure is stabilized.

[0112] As a practical application case of the bamboo-wood based stable structure grid board, it is mainly used as the core board of the floor. Specifically, by applying a special bamboo-wood based stable structure grid board, a new type of floor structure is designed. In terms of structural composition, the floor includes an upper surface board, a floor core board, and a lower surface board. The floor core board is composed of multiple pieces of the above-mentioned bamboo-wood based stable structure grid boards laid flat. The stable structure grid boards laid together are placed on the lower surface board and bonded. The upper surface board is bonded on the soft surface of the network body of the stable structure grid board. Moreover, the direction of the plant fibers on the upper surface board and the lower surface board is perpendicular to the direction of the expansion joints on the bamboo-wood based stable structure grid board. It is mainly to use the bamboo-wood based stable structure grid board to form an overall structure that is not easy to deform or has a similar deformation amount with the upper surface board and the lower surface board.

[0113] As an optimized application of the floor core board, the bamboo-wood based stable structure grid board is a frame-shear stable structure grid board. At least one side of the four sides of the frame-shear stable structure grid board is provided with a side board. The best application is that side boards are provided on all four sides to form a fully enclosed structure for the stable structure grid board, so that the floor core board is in a product form with stable structure during application. Its specifications and sizes are designed according to the size of a single floor. The middle part is a grid board with a large number of grid structures, and the surrounding is the enclosed side boards.

[0114] As an optimized layout form of the floor core board with a frame structure, the density of the expansion joints inside the frame-shear stable structure grid board is greater than that on both sides. A specific application case is that the seam distance in the central area is 5 mm and the seam distance in the edge area is 1 mm, and the upper surface board is a solid wood quarter-sawn board or rotary cut board. By setting the way of gradually decreasing the density gradient of the expansion joints, the stability in the middle is greater when cooperating with the upper surface board, and it is less likely to generate stress and cause deformation from the middle part. Thus, the made new type of floor has the characteristics of stable structure, not easy to deform and crack. It also enables the cork and bamboo that were originally not easy to be made into floor core boards to be widely used in the floor industry.

[0115] Undoubtedly, the above is only a limited application of an anti-deformation bamboo-wood based stable structure of the present invention. In addition, there can be other structural types and scenario applications. All in all, the protection scope of the present invention also includes other changes and substitutions that are obvious to those skilled in the art.

Claims

1. A bamboo and wood-based stable structure grid body, characterized in that It includes a first bamboo-wood based composite board and a second bamboo-wood based composite board. The first bamboo-wood based composite board and the second bamboo-wood based composite board are multi-layer thick laminated boards laminated together by gluing. The first bamboo-wood based composite board and the second bamboo-wood based composite board are laminated by gluing in an alternating manner. The plant fiber direction of the first bamboo-wood based composite board is perpendicular to the bonding surface, and the plant fiber direction of the second bamboo-wood based composite board is parallel to the bonding surface, so that the plant fiber directions are perpendicular to each other after the adjacent thick laminated boards are bonded; The thickness Q of the second bamboo-wood based composite board and the thickness B of the adjacent first bamboo-wood based composite board satisfy the following relationship: 0 < Q ≤ 2 * a2 * B wherein, the dry shrinkage rate range of the first bamboo-wood based composite board in the thickness direction is (a1, a2); A plurality of expansion joints are provided on the first bamboo-wood based composite board, so that the adjacent first bamboo-wood based composite board and the second bamboo-wood based composite board are combined to form a three-dimensional grid shape.

2. The bamboo-wood-based stable structure grid body according to claim 1, wherein, On the first bamboo-wood based composite board, a plurality of parallel expansion joints are provided along the plant fiber direction. The width of the expansion joint is H, and the distance between adjacent expansion joints is b, then it satisfies: b ≤ 12 mm, 0.1 mm ≤ H ≤ 2 mm; The top end face of the bamboo-wood based stable structure grid body is a soft surface for stabilizing the grid body, and the side face with the expansion joint is a hard surface for stabilizing the grid body.

3. The bamboo-wood-based stable structure grid body according to claim 2, wherein, It includes a first basic unit and a second basic unit. The first basic unit includes a first bamboo-wood based composite board and a second bamboo-wood based composite board. The first bamboo-wood based composite board and the second bamboo-wood based composite board are laminated by gluing. The second basic unit includes two first bamboo-wood based composite boards and a second bamboo-wood based composite board. The first bamboo-wood based composite boards on both sides and the second bamboo-wood based composite board in the middle are laminated by gluing to form a sandwich structure; the plant fiber direction of the first bamboo-wood based composite board is perpendicular to the bonding surface, and the plant fiber direction of the second bamboo-wood based composite board is parallel to the bonding surface, so that the plant fiber directions are perpendicular to each other after the adjacent thick laminated boards are bonded. On the first bamboo-wood based composite board, a plurality of parallel expansion joints are provided along the plant fiber direction. The front face of the first bamboo-wood based composite board with the expansion joint opening is a hard surface for stabilizing the grid body.

4. The bamboo and wood-based stable structure grid body according to claim 3, characterized in that In the first basic unit, on the first bamboo-wood based composite board, there are also cross joints intersecting with the expansion joints. The cross joints and the expansion joints appear on the hard surface for stabilizing the grid body. A panel is covered on the hard surface for stabilizing the grid body of the first bamboo-wood based composite board. The second bamboo-wood based composite board is used as the bottom plate and is parallel to the panel, which is called a single-layer column core board.

5. A bamboo-wood-based stable structure grid body according to claim 3, characterized in that, In the first basic unit, on the first bamboo-wood based composite board, there are also cross joints intersecting with the expansion joints. The hard surface for stabilizing the grid body of the first bamboo-wood based composite board is divided into several independent geometric bodies by the expansion joints and the cross joints. Part of the plant growth fibers of the second bamboo-wood based composite board are cut off by the expansion joints and the cross joints to form a supporting curved surface. The supporting curved surface with the independent geometric bodies is placed on a curved surface mold. The hard surface for stabilizing the grid body forms a curved surface the same as the curved surface mold. A bendable surface board is covered on the hard surface for stabilizing the grid body and laminated by gluing to make a curved panel, which is called a single-layer curved surface column core board.

6. The bamboo-wood-based stable structure grid body according to claim 3, characterized in that, In the second basic unit, a cross seam intersecting with the expansion joint is further provided on the first bamboo-wood composite board. The cross seam and the expansion joint appear on the stable structure hard surface of the grid body. A panel is covered on the stable structure hard surface of each first bamboo-wood composite board and laminated by gluing to form a large board, which is called a double-layer column core board.

7. The bamboo-wood-based stable structure grid body according to claim 3, characterized in that, In the second basic unit described above, a cross seam intersecting with the expansion joint is further provided on the first bamboo-wood composite board. The stable structure hard surface of the grid body of the first bamboo-wood composite board is divided into several independent geometric bodies by the expansion joint and the cross seam. Part of the plant growth fibers of the second bamboo-wood composite board are cut off by the expansion joint and the cross seam to form a supporting curved surface. The stable structure hard surface of one first bamboo-wood composite board is placed on a bendable surface board, which is arranged in a curved surface mold. Another bendable surface board is covered on the stable structure hard surface of the other first bamboo-wood composite board. The two layers of bendable surface boards are bonded and pressed with the second basic unit to form a curved panel, which is called a double-layer curved surface column core board.

8. A bamboo and wood-based stable structure grid body according to any one of claims 1-7, characterized in that, The first bamboo-wood composite board and the second bamboo-wood composite board are boards containing plant growth fibers, including wooden boards, multi-layer wooden boards, bamboo boards, multi-layer bamboo boards, or bamboo-wood composite multi-layer boards.

9. A bamboo-wood based stable structure grid board, which is a plate-like structure formed by sawing and pressing a combined layer of the bamboo-wood based stable structure grid body described in claim 2, and is characterized in that, The plate-like structure includes a plurality of bamboo-wood based stable structure grid bodies and a second bamboo-wood composite board. The plurality of bamboo-wood based stable structure grid bodies are arranged in rows in the same direction. The adjacent rows of bamboo-wood based stable structure grid bodies are bonded with the second bamboo-wood composite board, and the opening of the expansion joint of each bamboo-wood based stable structure grid body is closely attached to the second bamboo-wood composite board. The upper surface and the lower surface of the plate-like structure are both combined grid body stable structure soft surfaces containing a plurality of individual grid body stable structure soft surfaces.

10. A bamboo and wood-based stable structure grid board according to claim 9, characterized in that, The preparation method of the bamboo-wood based stable structure grid board is as follows: stack and place a plurality of bamboo-wood based stable structure grid bodies in layers, and the directions of the expansion joints in the bamboo-wood based stable structure grid bodies placed in the same layer are the same; bond the bamboo-wood based stable structure grid bodies between adjacent layers through the second bamboo-wood composite board, so that the opening end of the expansion joint is closely attached to the second bamboo-wood composite board; saw the combined and bonded bamboo-wood based stable structure grid bodies transversely into a plate-like structure, and the upper surface and the lower surface of the plate-like structure are both large-scale grid body stable structure soft surfaces composed of a plurality of individual grid body stable structure soft surfaces.

11. A bamboo-wood-based stable structure grid board according to claim 9, characterized in that, The relationship between the second bamboo-wood composite board in the bamboo-wood based stable structure grid body and the second bamboo-wood composite board between the bamboo-wood based stable structure grid bodies is as follows: If the directions of the plant growth fibers are all the same and all parallel to the stable structure soft surface of the grid body, it is a front-side bamboo-wood based stable structure grid board; If the directions of the plant growth fibers are all the same and all perpendicular to the stable structure soft surface of the grid body, it is a cross-side bamboo-wood based stable structure grid board; If the plant growth fibers are partially the same, that is, the growth fibers of part of the second bamboo-wood composite board are perpendicular to the stable structure soft surface of the grid body, and the growth fibers of part of the second bamboo-wood composite board are parallel to the stable structure soft surface of the grid body, then it is an adjusted surface stable structure grid board.

12. A bamboo-wood-based stable structure grid board according to claim 9, characterized in that, A functional core layer is further provided in the second bamboo-wood composite board, and the functional core layer is one or more of a heat-insulating and heat-preserving polyurethane board, a metal board, a fireproof board, a glass fiber braided layer, and a carbon fiber braided layer.

13. A bamboo and wood-based stable structure grid board according to claim 9, characterized in that, Edge plates are provided at the edges of the bamboo-wood-based stable structure grid board, and the bamboo-wood-based stable structure grid board with a frame formed is called a frame-shear stable structure grid board.

14. A bamboo-wood-based stable structure grid board according to claim 13, characterized in that, In the said frame-shear stable structure grid board, the arrangement density of the expansion joints near the midline part is greater than that of the expansion joints near the two side edges.

15. A floor, characterized in that, This floor contains the bamboo-wood-based stable structure grid board described in any one of claims 9-14. The external dimensions of the bamboo-wood-based stable structure grid board are the same as the specifications of a single floor board to serve as the floor core board. An upper surface board is provided above the floor core board, and a lower surface board is provided below the floor core board. The said upper surface board and lower surface board are both bonded to the combined grid body stable structure soft surface of the bamboo-wood-based stable structure grid body.

16. A floor according to claim 15, characterized in that, The said bamboo-wood-based stable structure grid board is a frame-shear stable structure grid board. The density of the expansion joints in the middle of the frame-shear stable structure grid board is greater than that on both sides, and the upper surface board is a solid wood quarter-sawn board or rotary cut board.

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