Method for preparing large-scale bamboo integrated wood by continuously lengthening with specification units

Abstract

The present application belongs to a kind of method for preparing large-scale bamboo integrated material by continuously lengthening with specification unit, and the present application includes the steps of specification standardization of bamboo integrated material preparation unit size, unit group span specification, splicing scheme, pyramid type, rhombus and ladder type lengthening criterion, and butt joint, lap joint connection mode etc.The method of the present application can prepare large-scale bamboo integrated material with continuous length and controllable width;The method can provide large-scale material for the application of bamboo integrated material in the field of structure, and in the equal length prefabricated ladder group unit and unequal length prefabricated ladder unit, the flattened bamboo boards of different lengths and sizes can be utilized at the same time, which plays an important role in expanding the application field of bamboo integrated material.The present application greatly saves manpower and material resources cost, improves production efficiency, unifies product quality specification, shortens processing time, and can prepare bamboo specification material with stable size specification, performance, small deformation to adapt to large-scale production, has the advantages of energy saving and material saving, the product is firm and reliable, has good toughness, does not crack for long time use, no warping, facilitates transportation and storage.

Description

Technical Field

[0001] This invention relates to a method for preparing large-scale bamboo laminated timber by continuously splicing together specification units. Background Technology

[0002] Engineered wood (AW) is produced by assembling and gluing smaller timber units into larger-scale materials. AW used in engineering structures, also known as glued laminated timber or structural composite timber, primarily uses standard timber units, graded, structurally designed, spliced, and glued together to create large-scale structural AW. Due to the standardization of its basic unit dimensions and modulus, it offers structural design flexibility. AW is mainly used as load-bearing components in construction projects such as buildings, large stadiums, and bridges. Currently, the technology for producing engineered wood is relatively mature in Europe and America, and corresponding standards and specifications have been established, such as ANSI / AIT C190.1, Canadian Standards Assumption (CSA) 0122, NDS-2013 (American Timber Structures Standard 2013), ASTM D3737, and the Japanese Agricultural and Forestry Standards for Engineered Wood for Construction.

[0003] my country is poor in timber resources but rich in bamboo resources. There are over 830 species of bamboo in my country, with bamboo forests covering 7.4 million hectares. China's bamboo production, output value, and processing technology are among the world's leading levels. Compared to wood-based engineered lumber, bamboo-based engineered lumber is made by processing bamboo into rectangular strips of specific dimensions, then treating them, drying them, applying glue, and finally gluing them together. Due to the hollow structure, nodes, anisotropy, and significant differences in material between the inner and outer walls of bamboo culms, directly assembling bamboo strips to manufacture engineered lumber makes it difficult to meet the dimensional and performance requirements for structural materials. Currently, the maximum length of standard bamboo strips in production is 2.1m, the width ranges from 10 to 30mm, and the thickness ranges from 1 to 8mm. Compared to standard timber lumber with a nominal thickness of 2 to 4 inches (50 to 100mm) and a nominal width greater than or equal to 2 inches (50mm), standard bamboo strips have smaller interface dimensions and limited length, necessitating the splicing and expansion of strips to produce large-size bamboo-based engineered lumber. However, at present, there is a lack of methods for preparing large-size bamboo laminated timber by splicing and expanding, which makes the application range of bamboo laminated timber in the construction field relatively narrow. It is mainly used for non-load-bearing materials such as flooring and partition boards, and there is a lack of bamboo laminated timber as load-bearing materials such as support columns and beams.

[0004] On the other hand, such as Figure 1As shown, the bamboo unfolded board 1 is characterized by a lower thickness greater than the upper thickness and a lower diameter greater than the upper diameter. The length and thickness of the unfolded surface are both trapezoidal. This characteristic dictates that when bamboo is used to produce standard sizes, a certain thickness of rectangular blocks 10 must be planed off. This planing process generates a large amount of waste bamboo material 11, accounting for approximately 30% of the bamboo volume, resulting in significant bamboo waste. Similarly, bamboo engineered wood is a board-shaped material made by assembling finely planed bamboo strips along the grain in the length direction and horizontally or vertically splicing them in the width direction, then gluing them together. Because its preparation unit finely planed bamboo strips retain the original structure and properties of bamboo, bamboo engineered wood has a density and properties close to those of bamboo. It is currently widely used in furniture, decoration, flooring, and building structures. However, the preparation of these finely planed bamboo strips also generates a large amount of waste bamboo material 11. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing large-scale bamboo laminated timber by continuously splicing standard units. By standardizing unit size and modulus, using butt or lap joint unit connection methods, and different types of splicing schemes, prefabricated unit groups are assembled and glued to produce large-scale bamboo laminated timber with continuous length, controllable size, and designable performance. This method can reduce waste bamboo material and can be used for load-bearing components such as building structures and bridges, thereby expanding the application fields of bamboo laminated timber.

[0006] Therefore, the method of the present invention includes the following steps:

[0007] (1) Fresh bamboo with a bamboo age of 5 years and a bamboo tip diameter of more than 10cm is selected. The bamboo is free from mold, insect holes, decay, and cracks, and has a uniform color. The cross-sectional length is divided into seven grades according to the different circumference and length of the bamboo. The length specifications are 0.3m, 0.6m, 0.9m, 1.2m, 1.5m, 1.8m, and 2.1m; the width specifications are 1cm to 10cm; the thickness specifications are 2mm to 8mm. The difference in thickness between the two ends of the same grade of length is not greater than 1mm. The resulting curved bamboo strips are softened, the green and yellow parts are removed, and the strips are unfolded without damage to obtain flat bamboo boards.

[0008] (2) When the difference in width between the two ends of the flattened bamboo board is greater than 0.5cm, the green and yellow bamboo surfaces of the flattened bamboo board are planed to be the same thickness as the small end of the bamboo board. The two longitudinal sides are inclined planes that naturally slope from the small end to the large end on the same side. The green or yellow bamboo surfaces of the bamboo board of the same thickness are trapezoidal in size, thus obtaining a trapezoidal flattened bamboo board.

[0009] When the difference in width between the two ends of a flattened bamboo board is less than or equal to 0.5cm, the longitudinal sides of the flattened bamboo board are planed flat to a plane with the same width as the small end of the bamboo board, and the green and yellow bamboo surfaces are planed flat to a plane with the same thickness as the small end of the bamboo board. The green or yellow bamboo surface is shaped into a rectangle of standard size, thus obtaining a rectangular block.

[0010] (3) The trapezoidal flat bamboo boards and rectangular blocks are classified and standardized by modulus, with bending modulus grades of 8 to 14 Gpa, to obtain different types of trapezoidal flat bamboo boards and rectangular blocks with different moduli.

[0011] (4) Apply glue to the butt joint of two pieces of modular trapezoidal flat bamboo boards of the same size and modulus grade, and glue the longitudinal bamboo sides of the two pieces of modular trapezoidal flat bamboo boards together. The large end of one piece of modular trapezoidal flat bamboo board and the small end of the other piece of modular trapezoidal flat bamboo board are on the same transverse bamboo side. The two pieces of modular trapezoidal flat bamboo boards form a parallelogram board with parallel bottom and top sides. Plane the two sides adjacent to the bottom and top sides and make them perpendicular to the bottom and top sides to obtain a modified rectangular block.

[0012] (5) Standardize the rectangular blocks, with a length range of 0.3m to 2.1m, using 0.3m as the length module unit, the length specifications are 0.3m, 0.6m, 0.9m, 1.2m, 1.5m, 1.8m, and 2.1m, the width specifications are 1cm to 10cm, and the thickness specifications are 2mm to 8mm; thus obtaining the standard rectangular blocks;

[0013] The modified rectangular blocks are standardized, with the bottom or top edge length ranging from 0.3m to 2.1m. Using 0.3m as the length module unit, the length specifications are 0.3m, 0.6m, 0.9m, 1.2m, 1.5m, 1.8m, and 2.1m. The width specifications are 1cm to 10cm, and the thickness specifications are 2mm to 8mm. This yields the modified rectangular blocks.

[0014] (6) For the modified rectangular blocks and the constituent units of the standard rectangular blocks obtained in step (5): including the constituent units of equal length blocks and unequal length blocks, straight-line connection between two units of the same type is adopted, the length of the modified rectangular blocks or standard rectangular blocks of each unit should be a multiple of 0.3m, and the width and thickness of each block in the same unit are the same.

[0015] (a) The constituent units of each equal-length block include the constituent units of equal-length stepped units. The length of each equal-length block in the unit is the same, and the length is a multiple of 0.3m. Blocks with the same multiple are equal-length blocks. When adjacent equal-length blocks form a unit, they are staggered by a length of 0.3m on the same side to obtain equal-length prefabricated stepped units of 3 steps, 5 steps and 7 steps.

[0016] (b) The constituent units of the blocks of unequal lengths include the constituent trapezoidal units of unequal lengths. The lengths of the blocks of unequal lengths in the unit are different. The lengths of the blocks of unequal lengths are all multiples of 0.3m. Blocks of unequal lengths are different multiples. When adjacent blocks of unequal lengths are assembled, the two sides of the trapezoid are either recessed or extended by 0.3m to obtain an unequal length prefabricated positive trapezoidal unit or an unequal length prefabricated inverted trapezoidal unit.

[0017] (7) Assembly of precast stepped units of equal length and precast trapezoidal units of unequal length:

[0018] (a) When assembling precast stepped billet units of equal length, when several precast stepped billet units of equal length are joined together, the transverse sides intersect end to end to form a diamond-shaped stepped staggered splicing precast unit billet. After the billet length is reached, the gaps on both sides of the same layer are filled with rectangular blocks of appropriate length. When widening precast stepped billet units of equal length in the same layer, adjacent rectangular blocks are joined with staggered joints. When thickening precast stepped billet units of equal length in different layers, adjacent rectangular blocks are joined with staggered joints. Adhesive is also required at each joint to form precast stepped billet composite material of equal length.

[0019] (b) When assembling precast trapezoidal units of unequal length, and when several precast positive trapezoidal units of unequal length are joined with precast negative trapezoidal units of unequal length, the positive and negative trapezoidal units are arranged laterally at intervals to form a precast unit assembly of positive and negative pyramidal staggered joints. After the assembly length is reached, the gaps at the two ends of the same layer are filled with rectangular blocks of appropriate length. When unequal length precast trapezoidal units of the same layer are widened, adjacent rectangular blocks of different lengths are joined at staggered joints. When unequal length precast trapezoidal units of different layers are thickened, adjacent rectangular blocks of unequal lengths of different lengths are joined at staggered joints. Adhesive is also required at each joint to form precast pyramidal precast composite material of unequal length.

[0020] (8) For the pressure applied to precast stepped composite materials of equal length or precast pyramid composite materials of unequal length, the main pressure is perpendicular to the bonding surface, and the other directions are auxiliary pressures. During the pressure application process, if the slab is laid flat, the side pressure is the main pressure; the composite material after assembly is pressed in the thickness direction of the slab and in the width direction, and if it is placed upright, the height direction is the main pressure.

[0021] (9) Adhesive curing methods for prefabricated stepped composite materials of equal length or prefabricated pyramid composite materials of unequal length: room temperature curing adhesives are cured for 2 to 4 hours under certain pressure conditions; high frequency medium heating method is to achieve rapid curing by making the transmission direction of the high frequency electrode parallel to the direction of the adhesive layer under high frequency action, and the curing time is 30s to 100s, thus obtaining cured composite materials.

[0022] (10) The use of standard rectangular blocks and modified standard rectangular blocks in the fields of construction, furniture and decoration.

[0023] As a preferred embodiment of the present invention, the types of adhesives include room temperature curing isocyanate adhesives, polyvinyl acetate adhesives, and high-frequency adhesives.

[0024] As a preferred technical solution of the present invention, the trapezoidal flattened bamboo boards have the same shape, length and thickness, different widths but the same thickness, and the bamboo green and bamboo yellow surfaces are trapezoidal in shape.

[0025] As a preferred embodiment of the present invention, the equal-length blocks are of the same shape, length, thickness and width, and the length of the assembled equal-length blocks is a multiple of 0.3m.

[0026] As a preferred embodiment of the present invention, the unequal length blocks are of the same shape, thickness and width, and the length of the assembled equal length blocks is a different multiple of 0.3m.

[0027] As a preferred technical solution of the present invention, the modified rectangular block is formed by splicing two trapezoidal flat bamboo boards together on one long side to form a quadrilateral board with the same and parallel bottom and top sides. The modified rectangular block is formed by modifying the adjacent sides to be perpendicular to the bottom and top sides. The lengthening, gluing, assembly, pressure application, adhesive curing method and application of the modified rectangular block are the same as those of the standard rectangular block.

[0028] As a preferred embodiment of the present invention, the bending modulus grades are: 8GPa, 9GPa, 10GPa, 11GPa, 12GPa, 13GPa, and 14GPa.

[0029] As a preferred technical solution of the present invention, the adhesive application method, while ensuring the amount of adhesive applied, can be selected from coating, spraying, or single-sided adhesive application.

[0030] As a preferred technical solution of the present invention, the standard rectangular blocks and the modified standard rectangular blocks are used as flooring materials; 1 to 2 panels spliced ​​by prefabricated stepped units of equal and unequal lengths are used as interior wall decorative panels, and 3 to 6 panels are used as non-load-bearing partition wall panels; when the cross-section of the cured assembled material is square with a cross-section of less than 6cm, it is used as rafters and tile columns in buildings; when the cross-section is between 6 and 10cm, it is used as purlins and beams in buildings; when the cross-section is square with a cross-section of more than 10cm, it is used as supporting columns and beam components in buildings.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] 1. This invention can significantly reduce waste bamboo material during processing. It does not aim to produce rectangular profiles from all flattened bamboo boards, meaning it does not require all six sides of the profile to be rectangular. Instead, it follows the natural shape of the flattened bamboo board. When the difference in width between the two ends of the flattened bamboo board is greater than 0.5cm, the green and yellow sides of the flattened bamboo board are planed to a plane with the same thickness as the smaller end of the bamboo board. The longitudinal sides are inclined planes that naturally slope from the smaller end to the larger end on the same side. The green or yellow side of the bamboo board of the same thickness is a trapezoid of the specified dimensions, resulting in a trapezoidal flattened bamboo board. When the difference in width between the two ends of the flattened bamboo board is less than or equal to 0.5cm, the longitudinal sides of the flattened bamboo board are planed to a plane with the same width as the smaller end of the bamboo board. The green and yellow sides are planed to a plane with the same thickness as the smaller end of the bamboo board. The green or yellow side is a rectangle of the specified dimensions, resulting in a rectangular block. This invention significantly reduces waste bamboo material. Preliminary calculations show that this invention can reduce waste bamboo material by 20% compared to existing technologies, thereby greatly reducing resource waste and waste bamboo material processing costs, which is beneficial to environmental protection.

[0033] 2. This invention includes steps such as standardizing the unit size of bamboo laminated timber preparation units, standardizing the span of unit groups, splicing schemes, pyramidal, rhomboid, and stepped splicing criteria, and butt joint and lap joint connection methods. The method of this invention can prepare large-scale bamboo laminated timber with continuous length and controllable width. This method can provide large-scale materials for the application of bamboo laminated timber in the structural field, and can simultaneously utilize flattened bamboo panels of different lengths in equal-length prefabricated stepped blank units and unequal-length prefabricated trapezoidal units, playing an important role in expanding the application fields of bamboo laminated timber.

[0034] 3. This invention greatly saves manpower and material costs, improves production efficiency, ensures uniform quality, and shortens processing time. This invention can produce bamboo materials with specific dimensions, stable performance, and minimal deformation to adapt to large-scale production. It has the advantages of energy-saving and material-saving methods, and the products are sturdy, reliable, tough, and do not crack or warp after long-term use, and are convenient for transportation and storage. Attached Figure Description

[0035] Figure 1 A schematic diagram of the processing structure of the rectangular block material of the present invention;

[0036] Figure 2 A schematic diagram of the trapezoidal flattened bamboo board of the present invention;

[0037] Figure 3 A schematic diagram of the modified rectangular block structure of the present invention;

[0038] Figure 4 A schematic diagram of the structure of the equal-length prefabricated three-step stepped unit of the present invention;

[0039] Figure 5 A schematic diagram of the structure of the equal-length prefabricated 5-step stepped unit of the present invention;

[0040] Figure 6 A schematic diagram of the structure of the equal-length prefabricated 7-step unit of the present invention;

[0041] Figure 7 A schematic diagram of the structure of the unequal-length prefabricated trapezoidal unit of the present invention;

[0042] Figure 8 A schematic diagram of the structure of the unequal-length prefabricated inverted trapezoidal unit of the present invention;

[0043] Figure 9 A schematic diagram of the structure of this invention, which uses modified rectangular blocks to form prefabricated trapezoidal units of unequal lengths;

[0044] Figure 10 A schematic diagram of the structure of the present invention, which uses prefabricated upright and inverted trapezoidal units of unequal length to extend the structure;

[0045] Figure 11 A schematic diagram of a straight-line connection between two similar unit blocks in this invention;

[0046] Figure 12 A schematic diagram of the structure of the prefabricated 7-step unit blanks of equal length in this invention. Detailed Implementation

[0047] Example 1: As Figures 1 to 12 As shown, a method for preparing large-scale bamboo laminated timber using continuous splicing of gauge units includes the following steps:

[0048] (1) Fresh bamboo with a bamboo age of 5 years and a bamboo tip diameter of more than 10cm is selected. The bamboo is free from mold, insect holes, decay, cracks and has a uniform color. The cross-sectional length is divided into seven grades according to the different circumference and length of the bamboo. The length specifications are 0.3m, 0.6m, 0.9m, 1.2m, 1.5m, 1.8m and 2.1m; the width specifications are 1cm to 10cm; the thickness specifications are 2mm to 8mm. The difference in thickness between the two ends of the same grade of length is not greater than 1mm. The resulting curved bamboo strips are softened, the green and yellow parts are removed and the strips are unfolded without damage to obtain flat bamboo board 1.

[0049] (2) For example Figure 2As shown, when the difference in width between the two ends of the flattened bamboo board is greater than 0.5cm, the green and yellow surfaces of the flattened bamboo board are planed to a plane with the same thickness as the small end of the bamboo board. The two longitudinal sides are inclined planes that naturally slope from the small end to the large end on the same side. The green or yellow surface of the bamboo board of the same thickness is a trapezoid of the specified size, resulting in trapezoidal flattened bamboo board 2. That is, the trapezoidal flattened bamboo board 2 has the same shape, length and thickness, but different widths and the same thickness. The green and yellow surfaces are trapezoidal.

[0050] like Figure 1 As shown, when the difference in width between the two ends of the flattened bamboo board is less than or equal to 0.5cm, the longitudinal sides of the flattened bamboo board are planed flat to form a plane with the same width as the small end of the bamboo board, and the green and yellow bamboo surfaces are planed flat to form a plane with the same thickness as the small end of the bamboo board. The green or yellow bamboo surface is in the shape of a rectangle of the specified size, resulting in a rectangular block 10.

[0051] When the difference in width between the two ends of the flattened bamboo board is greater than 0.5cm, trapezoidal flattened bamboo board 2 is made, and less material is removed from the longitudinal sides 11; when the difference in width between the two ends is less than or equal to 0.5cm, rectangular block 10 is made, which can reduce a lot of waste material.

[0052] (3) The modulus of trapezoidal flat bamboo boards and rectangular blocks are classified and standardized. The bending modulus grades are 8 to 14 GPa, and different types of modulus trapezoidal flat bamboo boards and modulus rectangular blocks are obtained respectively. The bending modulus grades are: 8 GPa, 9 GPa, 10 GPa, 11 GPa, 12 GPa, 13 GPa, 14 GPa.

[0053] (4) such as Figure 3 As shown, glue is applied to the butt joint of two modular trapezoidal flat bamboo boards of the same size and modulus grade. The longitudinal bamboo sides of the two modular trapezoidal flat bamboo boards are joined and bonded together. The large end of one modular trapezoidal flat bamboo board and the small end of the other modular trapezoidal flat bamboo board are on the same transverse bamboo side. The two modular trapezoidal flat bamboo boards form a parallelogram board with parallel bottom and top sides. The two sides adjacent to the bottom and top sides are planed flat and perpendicular to the bottom and top sides to obtain the modified rectangular block 21.

[0054] (5) The rectangular block 10 is standardized with a length range of 0.3m to 2.1m, using 0.3m as the length module unit. The length specifications are 0.3m, 0.6m, 0.9m, 1.2m, 1.5m, 1.8m, and 2.1m. The width specifications are 1cm to 10cm, and the thickness specifications are 2mm to 8mm. The standardized rectangular block is obtained.

[0055] The modified rectangular block 21 is standardized, with the bottom or top edge length ranging from 0.3m to 2.1m. Using 0.3m as the length module unit, the length specifications are 0.3m, 0.6m, 0.9m, 1.2m, 1.5m, 1.8m, and 2.1m. The width specifications are 1cm to 10cm, and the thickness specifications are 2mm to 8mm. Thus, the modified rectangular block is obtained.

[0056] (6) For the modified rectangular blocks and the constituent units of the standard rectangular blocks obtained in step (5): including the constituent units of equal length blocks and unequal length blocks, straight-line connection between two units of the same type is adopted, the length of the modified rectangular blocks or standard rectangular blocks of each unit should be a multiple of 0.3m, and the width and thickness of each block in the same unit are the same.

[0057] like Figures 4-6 As shown, (a) each equal-length block is a constituent unit, including a stepped unit of equal length. The length of each equal-length block is the same. The equal-length blocks are the same in shape, length, thickness and width. The length of the assembled equal-length blocks is the same multiple of 0.3m. That is, the length of each block can be a multiple of 0.3m. Blocks with the same multiple are equal-length blocks. When adjacent equal-length blocks are joined, they are staggered by the length of a 0.3m unit on the same side to obtain 3-step, 5-step and 7-step equal-length prefabricated stepped units.

[0058] like Figure 4 As shown, the length of each of the three equal-length blocks is 0.9m. Each block can be a multiple of 0.3m. When adjacent equal-length blocks are joined together, they are staggered by a 0.3m unit length on the same side to obtain a 3-step equal-length prefabricated stepped unit 12.

[0059] like Figure 5 As shown, the length of each of the five equal-length blocks is 1.5m. Each block can be a multiple of 5 times 0.3m. When adjacent equal-length blocks are joined together, they are staggered by a unit length of 0.3m on the same side, resulting in a 5-step equal-length prefabricated stepped unit 12.

[0060] like Figure 6 As shown, the length of each of the seven equal-length blocks is 2.1m. The length of each block can be a multiple of 7 times 0.3m. When adjacent equal-length blocks are joined together, they are staggered by a unit length of 0.3m on the same side to obtain a seven-step equal-length prefabricated stepped unit.

[0061] like Figures 7-8As shown, (b) each unequal length block is composed of a unit, including a trapezoidal unit of unequal length. The lengths of the unequal length blocks in the unit are different. The unequal length blocks are the same in shape, thickness and width, and the length of the assembled equal length blocks is a different multiple of 0.3m. The lengths of each unequal length block can all be multiples of 0.3m. Blocks with different multiples are unequal length blocks. When adjacent unequal length blocks are assembled, the two sides of the trapezoid are inward or outward by the length of a 0.3m unit, resulting in an unequal length prefabricated positive trapezoidal unit 13 or an unequal length prefabricated inverted trapezoidal unit 14.

[0062] like Figure 7 As shown, the lengths of the three unequal-length blocks are 0.3m, 0.9m, and 1.5m from top to bottom. Each block's length can be a multiple of 0.3m. When assembling adjacent unequal-length blocks, the two sides of the trapezoid are either recessed or extended inwards by a 0.3m unit length, resulting in an unequal-length prefabricated trapezoidal unit 13. Conversely, as... Figure 8 As shown, unequal-length prefabricated inverted trapezoidal units 14 are obtained.

[0063] like Figure 11 As shown, when splicing or assembling blanks, a straight-line connection structure between two similar unit blocks is used.

[0064] (7) Assembly of precast stepped units of equal length and precast trapezoidal units of unequal length:

[0065] like Figure 12 As shown, (a) When several prefabricated stepped billet units of equal length are joined together, the transverse sides intersect to form a rhomboid stepped staggered splicing prefabricated unit billet. After the billet length is reached, the gaps on both sides of the same layer are filled with rectangular blocks of appropriate length. When the prefabricated stepped billet units of equal length in the same layer are spliced ​​to be wider, the adjacent rectangular blocks are spliced ​​to be wider. When the prefabricated stepped billet units of equal length in each layer are spliced ​​to be thicker, the adjacent rectangular blocks are spliced ​​to be thicker. Adhesive is also required to be applied between each joint to form prefabricated stepped billet composite material 16 of equal length.

[0066] like Figure 10 As shown in (b), when several prefabricated trapezoidal units of unequal length are joined with prefabricated inverted trapezoidal units of unequal length, the prefabricated and inverted trapezoidal units are arranged laterally at intervals to form a prefabricated unit assembly with staggered joints in the shape of a pyramid. After the assembly length is reached, the gaps at the ends of the same layer are filled with rectangular blocks of appropriate length. When the prefabricated trapezoidal units of unequal length in the same layer are widened, the adjacent rectangular blocks are joined with staggered joints. When the prefabricated trapezoidal units of unequal length in each layer are thickened, the adjacent rectangular blocks are joined with staggered joints. Adhesive is also required at each joint to form a prefabricated pyramid assembly of unequal length.

[0067] like Figure 10As shown, the structure adopts a pyramidal arrangement of upright, inverted, and upright sections, with lengths of 2.1m, 2.7m, and 3.3m from top to bottom, respectively.

[0068] (8) When applying pressure to precast stepped composite materials of equal length or precast pyramid composite materials of unequal length, the main pressure is perpendicular to the bonding surface, and the other directions are auxiliary pressures. During the pressure application process, if the slab is laid flat, the side pressure is the main pressure. When the composite material is assembled, pressure is applied in four directions: thickness, width, and height. If it is placed upright, the height direction is the main pressure.

[0069] (9) Adhesive curing methods for prefabricated stepped composite materials of equal length or prefabricated pyramid composite materials of unequal length: room temperature curing adhesives are cured for 2 to 4 hours under certain pressure conditions; high frequency medium heating method is to achieve rapid curing by making the transmission direction of the high frequency electrode parallel to the direction of the adhesive layer under high frequency action, and the curing time is 30s to 100s, thus obtaining cured composite materials.

[0070] (10) The use of standard rectangular blocks and modified standard rectangular blocks in the fields of construction, furniture and decoration.

[0071] The types of adhesives include room temperature curing isocyanate adhesives, polyvinyl acetate adhesives, and high-frequency adhesives.

[0072] For the application of adhesive, while ensuring the amount of adhesive applied, you can choose to apply adhesive by coating, sprinkling, or applying adhesive to only one side.

[0073] Rectangular blocks of standard size and modified rectangular blocks are used as flooring materials; 1-2 panels spliced ​​from prefabricated stepped units of equal or unequal length are used as interior wall decorative panels, and 3-6 panels are used as non-load-bearing partition walls or non-load-bearing partition boards; when the cross-section of the cured precast composite material is less than 6cm square, it is used for rafters and tile columns in buildings; when the cross-section is between 6 and 10cm, it is used for purlins and beams in buildings; when the cross-section is greater than 10cm square, it is used for supporting columns and beam components in buildings.

[0074] Compared with the prior art, the beneficial effects of the present invention are:

[0075] Table 1: Comparison of Material Costs for 1 Cubic Meter of Laminated Timber

[0076] Details Traditional bamboo laminated timber The integrated material of the present invention Cost reduction percentage (%) Material usage / t 3.5 3.0 Material cost / yuan 2100 1800 -14.29 Adhesive dosage / kg 25 20 Adhesive cost / yuan 150 120 -20.00 Processing cost / yuan 2200 1800 -18.18 Yield / % 33 55 +22.00 Subtotal 4450 3360 16.40

[0077] Table 1 illustrates that the engineered wood of this invention reduces overall material costs by 16.40% compared to traditional bamboo engineered wood, demonstrating a low-cost advantage and improving economic efficiency. The invention also increases the yield by 22.00%, improving bamboo utilization, reducing waste bamboo material, and saving significant amounts of bamboo resources.

[0078] Example 2: As Figure 9 As shown, the difference from Example 1 is that the modified rectangular block is formed by splicing two trapezoidal flat bamboo boards together on one long side to form a quadrilateral board with the same and parallel bottom and top sides. The modified rectangular block is formed by modifying the adjacent sides to be perpendicular to the bottom and top sides. The composition, gluing, assembly, pressure application, adhesive curing method, and uses of the modified rectangular block are the same as those of the standard rectangular block. Since the modified rectangular block forms a trapezoidal unit 22, it will not be described again.

[0079] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing large-scale bamboo integrated material by continuously lengthening with specification units, characterized in that , comprising the following steps: (1) Bamboo selection of bamboo age 5 years, bamboo shoot diameter of more than 10 cm of fresh bamboo, appearance without mildew, worm hole, decay, cracking, uniform color of fresh bamboo, cross length according to the different bamboo diameter and length is divided into seven levels length specifications for 0.3 m, 0.6 m, 0.9 m, 1.2 m, 1.5 m, 1.8 m, 2.1 m; Width specification: 1 cm-10 cm; Thickness specification: 2 mm-8 mm, the same level length of two ends thickness difference is not more than 1 mm, get arc bamboo sheet, arc bamboo sheet by softening, green, yellow, non-injury, get flat bamboo plate; (2) when the two end width difference of flat bamboo plate is greater than 0.5 cm; Then the bamboo green and bamboo yellow surface of flat bamboo plate is planed to the same thickness of the small end of the bamboo plate, the longitudinal two sides are inclined planes naturally inclined from the small end to the big end of the same side, and the bamboo green or bamboo yellow surface shape is trapezoidal in size, getting trapezoidal flat bamboo plate; When the two end width difference of flat bamboo plate is less than and equal to 0.5 cm; The longitudinal two sides of flat bamboo plate are planed to the same width of the small end of the bamboo plate, and the bamboo green and bamboo yellow surface is planed to the same thickness of the small end of the bamboo plate, and the bamboo green or bamboo yellow surface shape is rectangular in size, getting rectangular block; (3) The trapezoidal flat bamboo plate and rectangular block are classified and modulated. The bending modulus grade is 8-14 Gpa, and different types of modulus trapezoidal flat bamboo plate and modulus rectangular block are obtained respectively. (4) The butt joint edge of two modulus trapezoidal flat bamboo plates with the same size specification and modulus grade is glued, the longitudinal adjacent two sides of the two modulus trapezoidal flat bamboo plates are bonded, the big end of one modulus trapezoidal flat bamboo plate and the small end of the other modulus trapezoidal flat bamboo plate are the same horizontal bamboo side, and the two modulus trapezoidal flat bamboo plates form a parallelogram plate with parallel bottom and top edges. The two sides adjacent to the bottom and top edges are planed and perpendicular to the bottom and top edges, getting a modified rectangular block. (5) The rectangular block is standardized. The length specification range is 0.3 m-2.1 m, and the length specification is 0.3 m, 0.6 m, 0.9 m, 1.2 m, 1.5 m, 1.8 m and 2.1 m with 0.3 m as the length modulus unit. The width specification is 1 cm-10 cm; The thickness specification is 2 mm-8 mm; Getting a specification rectangular block; The modified rectangular block is standardized. The bottom edge or top edge length specification range is 0.3 m-2.1 m, and the length specification is 0.3 m, 0.6 m, 0.9 m, 1.2 m, 1.5 m, 1.8 m and 2.1 m with 0.3 m as the length modulus unit. The width specification is 1 cm-10 cm; The thickness specification is 2 mm-8 mm; Getting a modified specification rectangular block; (6) The modified rectangular block material obtained in step (5) and the composition unit of the rectangular block material: including the composition of the equal-length block unit and the unequal-length block unit, the same type of two-unit block is connected by straight line, the length of each unit of the modified rectangular block material or the rectangular block material should be a multiple of 0.3 m, and the width and thickness of each block in the same unit are the same; (a) The composition unit of each equal-length block, including the composition of the equal-length ladder unit, the length of each equal-length block in the unit is the same, and the length is a multiple of 0.3 m, the multiple is the same, and the adjacent equal-length block composition unit is staggered to the same side by 0.3 m, obtaining 3-step, 5-step and 7-step equal-length prefabricated ladder unit; (b) The composition unit of each unequal-length block, including the composition of the unequal-length ladder unit, the length of each unequal-length block in the unit is different, and the length of each unequal-length block is a multiple of 0.3 m, the multiple is different, and the adjacent unequal-length block is composed of a 0.3 m length of the two sides of the trapezoidal shape inward or outward, obtaining an unequal-length prefabricated right trapezoidal unit or an unequal-length prefabricated inverted trapezoidal unit; (7) The composition of the equal-length prefabricated ladder composition unit and the unequal-length prefabricated trapezoidal unit: (a) The composition of the equal-length prefabricated ladder composition unit, when several equal-length prefabricated ladder composition units are connected and composed, the horizontal side edges intersect at the ends to form a rhombus ladder staggered joint prefabricated unit composition, after reaching the composition length, the gaps in the same layer of the two sides are filled with rectangular blocks of appropriate length; when the same layer of equal-length prefabricated ladder composition units are widened, the adjacent rectangular blocks are staggered and connected; when the layers of equal-length prefabricated ladder composition units are thickened, the adjacent layers of rectangular blocks are staggered and thickened; adhesive needs to be applied between each joint to form an equal-length prefabricated ladder composition integrated material; (b) The composition of the unequal-length prefabricated trapezoidal unit, when several unequal-length prefabricated right trapezoidal units and unequal-length prefabricated inverted trapezoidal units are connected and composed, the right and inverted trapezoidal units are horizontally arranged in intervals to form a right and inverted pyramid staggered joint prefabricated unit composition, after reaching the composition length, the gaps in the same layer of the two sides are filled with rectangular blocks of appropriate length; when the same layer of unequal-length prefabricated trapezoidal units are widened, the adjacent rectangular blocks are staggered and connected; when the layers of unequal-length prefabricated trapezoidal units are thickened, the adjacent layers of unequal-length rectangular blocks are staggered and thickened; adhesive needs to be applied between each joint to form an unequal-length prefabricated pyramid composition integrated material; (8) The pressure of the equal-length prefabricated ladder composition integrated material or the unequal-length prefabricated pyramid composition integrated material, the main pressure is perpendicular to the bonding surface, and the remaining directions are auxiliary pressure, during the pressure process, the board blank is placed horizontally, and the side pressure is the main pressure; the composed integrated material is pressed in the thickness, width and height directions, and the height direction is the main pressure. (9) The adhesive curing method for the equal-length pre-prepared ladder-shaped set integrated material or the unequal-length pre-prepared pyramid-shaped set integrated material: the normal-temperature curing adhesive is cured under certain pressure for 2-4 hours; the high-frequency medium heating method is used to make the high-frequency electrode transmission direction parallel to the adhesive layer direction to realize rapid curing under high-frequency action, and the curing time is 30-100 seconds, and the cured set integrated material is obtained.

2. The method of claim 1, wherein: The adhesive types include normal-temperature curing isocyanate adhesive, polyvinyl acetate adhesive, and high-frequency adhesive.

3. The method of claim 1, wherein: The shape, length and thickness of the trapezoidal flattened bamboo board are the same, the width of the trapezoidal flattened bamboo board is different and the thickness is the same, and the shapes of the bamboo green and bamboo yellow surfaces are trapezoidal.

4. The method of claim 1, wherein: The equal-length block material is the same in shape, length, thickness and width, and the length of the set equal-length block material is the same multiple of 0.3 m.

5. The method of claim 1, wherein: The unequal-length block material is the same in shape, thickness and width, and the length of the set equal-length block material is not the same multiple of 0.3 m.

6. The method of claim 1, wherein: The modified specification rectangular block material is formed by splicing two trapezoidal flattened bamboo boards at a long side to form a quadrilateral board with the same length of the bottom and top edges and parallel to each other, and then modifying the adjacent edges to be perpendicular to the bottom and top edges to form a modified specification rectangular block material, and the lengthening, gluing, setting, pressing, adhesive curing method, use and specification of the modified specification rectangular block material are the same as those of the specification rectangular block material.

7. The method of claim 1, wherein: The bending modulus grade is: 8 GPa, 9 GPa, 10 GPa, 11 GPa, 12 GPa, 13 GPa, 14 GPa.

8. The method of claim 1, wherein: The gluing method is selected from the coating gluing and the shower gluing under the condition of ensuring the gluing amount, or single-sided gluing.

9. The method of claim 1, wherein: The linear butt joint structure is adopted between the two single-unit blocks of the same type during lengthening or setting.

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