A truss type bamboo shaving oriented laminated timber bridge deck panel and a manufacturing method thereof

Abstract

This invention relates to the field of engineering construction technology, specifically disclosing a truss-type bamboo shavings oriented laminated timber (OFL) bridging panel and its manufacturing method. The truss-type OFL bridging panel comprises two parallel layers of laminated panels. Each layer of the laminated panel is composed of several stacked units with several reinforcing steel bars inserted through them. Each stacked unit is composed of several stacked bamboo shavings OFLs. A truss support layer is provided between adjacent stacked units. The truss support layer is composed of several steel chords arranged alternately, and the truss support layer is fixed by reinforcing steel bars inserted through the laminated panels on both sides. This invention arranges the bamboo shavings OFLs along their thickness direction to form a large-format whole, fully utilizing the in-plane mechanical properties of bamboo shavings OFLs. No adhesive is required between the bamboo shavings OFLs. The two layers of laminated panels are connected by several truss support layers, resulting in a high overall load-bearing capacity.

Description

Technical Field

[0001] This invention relates to the field of engineering construction technology, and specifically discloses a truss-type bamboo shavings oriented laminated timber (OFL) panel and its manufacturing method. Background Technology

[0002] Timber-structured bridges once held a significant place in the history of bridge development worldwide. However, with the ever-increasing demands for bridge spans in actual engineering projects, bamboo-and-wood bridges, primarily constructed from solid wood, gradually became unable to meet design requirements. But since the 1970s, advancements in modern bamboo and wood product processing technology, especially the emergence of engineered wood and engineered bamboo products, have greatly improved the weather resistance and performance stability of engineered bamboo and wood products. Furthermore, due to the natural affinity between bamboo and wood, and the growing emphasis on sustainable development, modern timber-and-bamboo bridge structures have gradually attracted increasing attention from engineering professionals and have been widely adopted in various countries.

[0003] Bamboo shavings oriented laminated lumber (BOSL) is a new type of engineered bamboo product. Compared with conventional engineered wood, it has stronger weather resistance and mechanical properties. Moreover, BOSL can be produced on a large scale using continuous hot presses, which is more in line with the development concept of industrialized construction and has broad application prospects.

[0004] However, existing research has shown that BOSL's in-plane bending strength is significantly higher than its out-of-plane bending strength. Therefore, if bamboo engineered structural panels are fabricated using an orthogonal structure similar to cross-laminated timber (BLT), its superior in-plane mechanical properties cannot be effectively utilized. Furthermore, due to the high surface roughness of BOSL, a large amount of adhesive is typically required when using cold-pressing processes, resulting in higher costs for the laminated products. Additionally, although BOSL possesses high mechanical strength, its modulus of elasticity is relatively low compared to conventional engineered wood products, making it difficult to meet deflection requirements in large-span engineering designs.

[0005] Chinese patent document CN01134327A discloses an anti-deformation laminated bamboo and wood board, which is made of bamboo and wood sheets perpendicular to the plane of the board and glued together. Within the bamboo and wood board, a through hole extending across the entire width of the board is provided, starting from the side of the board. A stud in the through hole is tightly fitted, and the length of the stud is equal to the width of the board. Alternatively, blind holes, starting from two sides of the board, are staggered and facing each other, with studs in the blind holes tightly fitted. The length of the stud is less than the width of the board but greater than half its width. This invention, by using studs to connect the bamboo and wood sheets together, strengthens their bond and acts as a transverse keel, increasing the strength of the relatively weaker transverse section and effectively resisting and preventing transverse deformation. The drawbacks are that bamboo and wood boards have a high surface roughness and require a large amount of glue; as a support board for long-span bridges, their load-bearing and shear resistance are limited. Summary of the Invention

[0006] To address the problems of existing bamboo and wood panels that rely on adhesive bonding between panels, resulting in a large amount of adhesive and insufficient overall strength for supporting long-span bridges, this invention provides a truss-type bamboo shavings oriented laminated timber (OFL) bridge panel. This eliminates the need for adhesive bonding between panels. Instead, the rough surface of the OFL allows for the stacking and securing of individual bamboo shavings along their thickness direction to form a large-format panel. The truss structure between these panels evenly distributes the load, improving overall load-bearing capacity and shear resistance.

[0007] To achieve the above-mentioned technical effects, the present invention provides the following technical solution: A truss-type bamboo shavings oriented laminated timber (OFL) bridge panel includes two parallel layers of laminated panels. Each layer of the laminated panel is composed of several laminated units stacked together and fitted with several reinforcing bars. Each laminated unit is composed of several layers of bamboo shavings OFL. A truss support layer is provided between adjacent laminated units. The truss support layer is composed of several steel chords arranged alternately. The truss support layer is fixed by reinforcing bars inserted into the laminated panels on both sides.

[0008] The laminated panel of this invention is formed by stacking several bamboo shavings oriented laminated timbers of the same size and specifications along the thickness direction and securing them with reinforcing steel bars. This arrangement fully utilizes the in-plane bending resistance of the bamboo shavings oriented laminated timber. No adhesive is required between adjacent layers of bamboo shavings oriented laminated timber, resulting in lower manufacturing costs compared to cold-pressing bonding. The two laminated panels are arranged in parallel and connected by several steel chords to form a truss support structure. The steel chords are respectively threaded through the reinforcing steel bars in the two laminated panels and clamped and secured by the two laminated panels. Thus, in use, the laminated panel of this invention uses the two laminated panels as supporting surfaces and the steel chords between them as supporting layers. Due to the special arrangement of the steel chords and reinforcing steel bars, the force on the two laminated panels is decomposed along the in-plane direction of the bamboo shavings oriented laminated timber in each layer, thereby fully utilizing the in-plane bending resistance of the bamboo shavings oriented laminated timber.

[0009] Preferably, at least one truss support layer is provided between adjacent stacked units. The truss between two adjacent stacked units can be a single layer or multiple layers.

[0010] Preferably, the reinforcing bars in each layer of the laminated slab are arranged at equal intervals, and the reinforcing bars in two layers of the laminated slab are arranged at the same intervals, with the reinforcing bars in the two layers of the laminated slab staggered. A plurality of the steel chord members are arranged in a W-shape staggered configuration. The staggered arrangement of the reinforcing bars in the two layers of the laminated slab allows the steel chord members between the two layers of the laminated slab to be inclined to form a truss structure. The truss structure can adopt a W-shaped staggered arrangement.

[0011] Preferably, the laminated unit comprises at least three layers of bamboo shavings oriented laminated material. Depending on design requirements, the laminated unit can be configured as three layers of bamboo shavings oriented laminated material stacked together, or more layers of bamboo shavings oriented laminated material stacked together.

[0012] Preferably, the laminated unit includes an inner layer unit and an outer layer unit. The outer layer unit is disposed on both sides of the laminated board, and the inner layer unit is disposed between the two inner layers. The ratio of the amount of bamboo shavings oriented laminated timber in the outer layer unit to the amount of bamboo shavings oriented laminated timber in the inner layer unit is 1 / 2. The amount of bamboo shavings oriented laminated timber in the inner layer unit is set to twice the amount in the outer layer unit. This setting ensures the bending resistance of the inner layer unit and facilitates the application of preload to the laminated board.

[0013] Preferably, a clamping block and a fastening nut are respectively provided at both ends of the fastening steel bar.

[0014] Preferably, the steel chord has holes at both ends, and the distance between the holes is equal to the spacing of the fastening reinforcing bars in the laminated plate. This arrangement of the steel chord results in a 45° angle between the steel chord and the laminated plate, leading to more uniform stress distribution on the laminated plate.

[0015] Preferably, the two layers of laminated plates include an upper laminated plate and a lower laminated plate, wherein the number of fastening reinforcing bars passing through the upper laminated plate is n, and the number of fastening reinforcing bars passing through the lower laminated plate is n+1.

[0016] Preferably, the fastening reinforcing bars at both ends of the lower layer plate are further provided with several steel pads, which are located between the layer plate unit and the steel chord.

[0017] The present invention also provides a method for manufacturing a truss-type bamboo shavings oriented laminated timber (OFL) panel, for use in the aforementioned truss-type bamboo shavings OFL panel, comprising the following steps: Step S1. Sawing large-format bamboo shavings into oriented laminated timber to form several pieces of bamboo shavings with the same dimensions; Step S2. Based on the diameter of the reinforcing bar, process several holes of the same size on the surface of the bamboo shavings oriented laminated lumber board, and process holes of the same size at both ends of the steel chord. Step S3. Insert several layers of bamboo shavings oriented laminated timber and steel chords into the holes and tighten the reinforcing bars in sequence according to the design width; Step S4. Tighten the fasteners at both ends of the reinforcing bar and apply tightening force.

[0018] In step S1, a sawing device is used to cut the large-format bamboo shavings oriented laminated timber into several pieces of the same size and specifications, preferably in strips. In step S2, the openings on the surface of the bamboo shavings oriented laminated timber are arranged at certain intervals. In step S3, a certain number of bamboo shavings oriented laminated timbers are used to form laminated units, with steel chords arranged between adjacent laminated units; both layers of laminated timber are fabricated simultaneously. In step S4, a fastening force is applied to the two layers of laminated timber; preferably, three fastenings are performed according to design requirements, and these three fastenings are completed within one week.

[0019] The beneficial effects of this invention are: 1. The laminated board in this invention uses bamboo shavings oriented laminated lumber (OPL) stacked along its thickness direction to form a large-format whole, which can fully utilize the advantages of the in-plane mechanical properties of OPL; 2. No glue is required between the bamboo shavings OPLs, which can be fabricated on-site, with a short construction period, convenient transportation, and greatly reduced production and transportation costs; 3. Relying on the rough surface characteristics of bamboo shavings OPL, the laminated board adopts a stress-fastened lamination method, which improves the overall integrity and has high shear resistance; 4. The double-layer laminated boards are connected by multiple layers of truss support, and the whole has a high load-bearing capacity. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a truss-type bamboo shavings oriented laminated timber (OFL) bridge panel.

[0021] Figure 2 This is a side view of a truss-type bamboo shavings oriented laminated timber (OFL) panel.

[0022] Figure 3 This is a schematic diagram of the arrangement of the truss support layer.

[0023] Figure 4 This is a schematic diagram showing the structure and layout of the steel pad.

[0024] Figure 5 A schematic diagram of the steel stringer structure for implementing the third section.

[0025] Figure 6 A schematic diagram illustrating the arrangement of the steel chords in section three.

[0026] Icon labels: 1. Laminated slab; 2. Truss support layer; 3. Reinforcing steel; 4. Bamboo shavings oriented laminated lumber; 1.1 Upper layer laminate; 1.2 Lower layer laminate; 1.3 Laminated unit; 1.4 Inner layer unit; 1.5 Outer layer unit; 2.1 Steel chord; 2.2 Butt joint groove; 2.3 Steel pad; 3.1 Clamping block; 3.2 Tightening nut. Detailed Implementation

[0027] The beneficial effects of the present invention will be described in detail below with reference to specific embodiments.

[0028] Example 1 Bamboo shavings oriented strand lumber (BOSL) is a new type of engineered bamboo product. Compared to conventional engineered wood, it boasts superior weather resistance and mechanical properties. Furthermore, BOSL can be mass-produced using continuous hot presses, aligning better with the development philosophy of industrialized construction and offering broad application prospects. However, existing research indicates that BOSL's in-plane bending strength is significantly higher than its out-of-plane bending strength. If orthogonal structures similar to cross-laminated timber (CFLAP) are used to fabricate bamboo engineered structural panels, its superior in-plane mechanical properties cannot be effectively utilized. Additionally, due to the high surface roughness of BOSL, a large amount of adhesive is typically required during cold-pressing, leading to higher costs for the laminated products. Moreover, while BOSL possesses high mechanical strength, its modulus of elasticity is relatively low compared to conventional engineered wood products, making it difficult to meet deflection requirements in large-span engineering designs.

[0029] Reference Appendix Figure 1 and Figure 2This embodiment provides a truss-type bamboo shavings oriented laminated timber (BOSL) bridge panel, which fully utilizes the in-plane mechanical properties of BOSL. Specifically, it includes two layers of laminated panels 1 composed of bamboo shavings 4, and a multi-layered truss support plate disposed between the two laminated panels 1. The laminated panels 1 and the truss support plate are formed by several reinforcing steel bars 3 passing through and fastening them together. Each laminated panel 1 includes several laminated units 1.3, and a truss support plate is disposed between adjacent laminated units 1.3. The number of laminated units 1.3 is determined according to the actual design width, and the truss support plate is disposed simultaneously. Thus, the two laminated panels 1 form two parallel large-format support surfaces, with the truss support plate serving as the support structure between the two laminated panels 1.

[0030] The truss support plate includes several staggered steel chords 2.1, with the ends of the steel chords 2.1 respectively passing through the fastening steel bars 3 in the two layers of laminated slabs 1. The force direction of the two layers of laminated slabs 1 is decomposed into two directions along the length and thickness of the laminated slabs 1 by the steel chords 2.1 and the fastening steel bars 3, thus making full use of the in-plane mechanical properties of the bamboo shavings oriented laminated lumber 4.

[0031] No glue is needed between adjacent bamboo shavings oriented laminated timber 4. Utilizing the rough surface of the bamboo shavings oriented laminated timber 4, the laminated board 1 is fastened by the reinforcing steel bars 3, so that each bamboo shavings oriented laminated timber 4 forms a whole.

[0032] The truss-type bamboo shavings oriented laminated timber (OFL) panel in this embodiment effectively utilizes the advantages of OFL's in-plane mechanical properties, resulting in a high overall structural mechanical performance. The high surface roughness of OFL, combined with a stress-fastened lamination method, ensures high integrity of the laminated panels. The contact surfaces between the layers possess high shear resistance, achieving a synergistic stress-bearing effect. No adhesive is required between the OFL layers, allowing for rapid on-site assembly of the structures, offering high flexibility, a short construction period, and convenient transportation.

[0033] Example 2 Reference Appendix Figures 1 to 4 In this embodiment, the truss-type bamboo shavings oriented laminated timber (OFL) bridge panel includes two parallel laminated panels 1. Each laminated panel 1 is composed of several laminated units 1.3 stacked together and several fastening steel bars 3 inserted through them. Each laminated unit 1.3 is composed of several bamboo shavings OFL 4 stacked together. A truss support layer 2 is provided between adjacent laminated units 1.3. The truss support layer 2 is composed of several steel chords 2.1 arranged alternately. The truss support layer 2 is fixed by fastening steel bars 3 inserted through it in the laminated panels 1 on both sides.

[0034] In this embodiment, the laminated board 1 is formed by stacking several bamboo shavings oriented laminated timber 4 of the same size and specifications along the thickness direction and fastening them with reinforcing steel bars 3. This arrangement fully utilizes the in-plane bending resistance of the bamboo shavings oriented laminated timber 4. No glue is required between adjacent layers of bamboo shavings oriented laminated timber 4, which reduces manufacturing costs compared to cold pressing. The two laminated boards 1 are arranged in parallel and connected by several steel chords 2.1 to form a truss support structure. The steel chords 2.1 are respectively threaded by the reinforcing steel bars 3 in the two laminated boards 1 and clamped and fastened by the two laminated boards 1. Thus, in the use of the bridge panel of the present invention, the two layers of laminated panels 1 serve as supporting surfaces, and the steel chord 2.1 between them serves as a supporting layer. Based on the special arrangement of the steel chord 2.1 and the fastening steel bar 3, the force on the two layers of laminated panels 1 is decomposed into the in-plane direction along the bamboo shavings oriented laminated material 4 of each layer of laminated panels 1, thereby giving full play to the in-plane bending resistance of the bamboo shavings oriented laminated material 4.

[0035] Furthermore, in this embodiment, a truss support layer 2 is provided between adjacent stacked units 1.3. In other embodiments of this embodiment, multiple layers of the truss support layer 2 between adjacent stacked units 1.3 may be provided.

[0036] Further, see attached document. Figure 3 In this embodiment, the reinforcing bars 3 in the laminated slab 1 are arranged at equal intervals, and the reinforcing bars 3 in both layers of laminated slab 1 are arranged at the same intervals, with the reinforcing bars 3 in the two layers of laminated slab 1 staggered. This arrangement causes the steel chord 2.1 between the two layers of laminated slab 1 to be inclined to form a truss structure. The truss structure in this embodiment adopts a W-shaped staggered arrangement.

[0037] Further, see attached document. Figure 2 In this embodiment, the laminated unit 1.3 includes an inner layer unit 1.4 and an outer layer unit 1.5. The outer layer unit 1.5 is disposed on both sides of the laminated plate 1, and the inner layer unit 1.4 is disposed between the two inner layers. The inner layer unit 1.4 includes six layers of bamboo shavings oriented laminated timber 4, and the outer layer unit 1.5 includes three layers of bamboo shavings oriented laminated timber 4. The number of bamboo shavings oriented laminated timber 4 in the inner layer unit 1.4 is set to twice the number of bamboo shavings oriented laminated timber 4 in the outer layer unit 1.5. This arrangement ensures the bending resistance of the inner layer unit 1.4 and facilitates the application of preload to the laminated plate 1.

[0038] Furthermore, in this embodiment, clamping blocks 3.1 and fastening nuts 3.2 are respectively provided at both ends of the fastening reinforcing bar 3. Threads are provided at both ends of the fastening reinforcing bar 3, and the clamping blocks 3.1 have a central opening and are fitted onto both ends of the fastening reinforcing bar 3, abutting against the outer layer unit 1.5. The laminated plate 1 is fastened by the nuts at both ends of the fastening reinforcing bar 3, improving the integrity of the laminated plate 1 and making full use of the surface roughness characteristics of the bamboo shavings oriented laminated material 4.

[0039] Furthermore, in this embodiment, the distance between the openings at both ends of the steel chord 2.1 is equal to the spacing of the fastening reinforcing bars 3 in the laminated plate 1. This arrangement of the steel chord 2.1 results in an angle of 45° between it and the laminated plate 1, leading to more uniform stress distribution on the laminated plate 1. In other embodiments of this embodiment, the distance between the openings at both ends of the steel chord 2.1 can be set to be greater than or less than the spacing of the fastening reinforcing bars 3 in the laminated plate 1, thereby changing the angle between the steel chord 2.1 and the laminated plate 1.

[0040] In this embodiment, the two-layer laminated slab 1 is divided into an upper laminated slab 1.1 and a lower laminated slab 1.2. The upper laminated slab 1.1 serves as the actual support panel. The upper laminated slab 1.1 has n reinforcing bars 3, and the lower laminated slab 1.2 has n+1 reinforcing bars 3. The reinforcing bars 3 in both the upper and lower laminated slabs 1.1 and 1.2 are arranged at the same intervals and are positioned opposite each other. Specifically, in this embodiment, the upper laminated slab 1.1 has 5 reinforcing bars 3, and the lower laminated slab 1.2 has 6 reinforcing bars 3. In actual use, the upper laminated slab 1.1 and the lower laminated slab 1.2 are connected at both ends to steel frame plates and other fasteners and fixed to the foundation. In this embodiment, the steel chord 2.1 is a steel plate in the shape of a parallelogram. When the steel chord 2.1 is stacked between adjacent stacked units 1.3, both ends of the steel chord 2.1 only contact the same stacked unit 1.3 to avoid tilting between the steel chord 2.1 and the bamboo shavings oriented laminated material 4, which would cause uneven stress on the steel chord 2.1 after the stacking and tightening of the reinforcing bars 3.

[0041] In this embodiment, refer to the appendix. Figure 4 Several steel pads 2.3 are also inserted through the fastening reinforcing bars 3 at both ends of the lower layer plate 1.2. The thickness of the steel pads 2.3 is the same as the thickness of the steel chord 2.1. The cross-sectional shape and size of the steel pads 2.3 are consistent with those of the clamping blocks 3.1. In this embodiment, the clamping block 3.1 has a square cross-section, and the end face of the steel pads 2.3 is also square. The steel pads 2.3 have a central hole, the diameter of which is set according to the outer diameter of the fastening reinforcing bars 3. The steel pads are arranged between the stacking units 1.3 of the lower layer plate 1.2 and are inserted through the fastening reinforcing bars 3 at both ends of the lower layer plate 1.2, cooperating with the steel chord 2.1. Taking the steel fastening rebar 3 located at one end of the lower layer slab 1.2 as an example, since only one steel chord rod 2.1 is threaded through each connection point of this fastening rebar 3, the bamboo shavings oriented laminated timber 4 in the layer slab 1 will bend after the lower layer slab 1.2 is stacked and fastened. To ensure the strength of the lower layer slab 1.2, a steel pad 2.3 is threaded through each connection point of this fastening rebar 3. In this way, bending at both ends of the lower layer slab 1.2 is avoided.

[0042] This embodiment also provides a method for manufacturing a truss-type bamboo shavings oriented laminated timber (OFL) bridge panel, including the following steps.

[0043] First, large-format bamboo shavings oriented laminated timber 4 are sawn to form several 40mm×80mm×6000mm bamboo shavings oriented laminated timber 4.

[0044] Next, select a 22mm diameter reinforcing bar 3 and machine several 22mm holes on the surface of the bamboo shavings oriented laminated timber 4. The holes are set at equal intervals. Machine 22mm holes at both ends of the steel chord 2.1.

[0045] Next, with six layers of bamboo shavings oriented laminated timber 4 as one inner unit 1.4 and three layers of bamboo shavings oriented laminated timber 4 as one outer unit 1.5, and using a five-layer inner unit 1.4 setup, the bamboo shavings oriented laminated timber 4 and steel chord rods 2.1 are sequentially inserted into the holes to secure the reinforcing bars 3.

[0046] Finally, connect the clamping blocks 3.1 and the fastening nuts 3.2 at both ends of the reinforcing bar 3 and apply the tightening force to perform three tightenings, which are completed within one week.

[0047] The truss-type bamboo shavings oriented laminated timber (OFL) panel in this embodiment effectively utilizes the advantages of OFL's in-plane mechanical properties, resulting in a high overall structural mechanical performance. The high surface roughness of OFL, combined with a stress-fastened lamination method, ensures high integrity of the laminated panels. The contact surfaces between the layers possess high shear resistance, achieving a synergistic stress-bearing effect. No adhesive is required between the OFL layers, allowing for rapid on-site assembly of the structures, offering high flexibility, a short construction period, and convenient transportation.

[0048] Example 3 Reference Appendix Figures 1 to 3 ,as well as Figure 5 and Figure 6 In this embodiment, the truss-type bamboo shavings oriented laminated timber (OFL) bridge panel includes two parallel laminated panels 1. Each laminated panel 1 is composed of several laminated units 1.3 stacked together and several fastening steel bars 3 inserted through them. Each laminated unit 1.3 is composed of several bamboo shavings OFL 4 stacked together. A truss support layer 2 is provided between adjacent laminated units 1.3. The truss support layer 2 is composed of several steel chords 2.1 arranged alternately. The truss support layer 2 is fixed by fastening steel bars 3 inserted through it in the laminated panels 1 on both sides.

[0049] In this embodiment, the laminated board 1 is formed by stacking several bamboo shavings oriented laminated timber 4 of the same size and specifications along the thickness direction and fastening them with reinforcing steel bars 3. This arrangement fully utilizes the in-plane bending resistance of the bamboo shavings oriented laminated timber 4. No glue is required between adjacent layers of bamboo shavings oriented laminated timber 4, which reduces manufacturing costs compared to cold pressing. The two laminated boards 1 are arranged in parallel and connected by several steel chords 2.1 to form a truss support structure. The steel chords 2.1 are respectively threaded by the reinforcing steel bars 3 in the two laminated boards 1 and clamped and fastened by the two laminated boards 1. Thus, in the use of the bridge panel of the present invention, the two layers of laminated panels 1 serve as supporting surfaces, and the steel chord 2.1 between them serves as a supporting layer. Based on the special arrangement of the steel chord 2.1 and the fastening steel bar 3, the force on the two layers of laminated panels 1 is decomposed into the in-plane direction along the bamboo shavings oriented laminated material 4 of each layer of laminated panels 1, thereby giving full play to the in-plane bending resistance of the bamboo shavings oriented laminated material 4.

[0050] Furthermore, in this embodiment, a truss support layer 2 is provided between adjacent stacked units 1.3. In other embodiments of this embodiment, multiple layers of the truss support layer 2 between adjacent stacked units 1.3 may be provided.

[0051] Further, see attached document. Figure 3 In this embodiment, the reinforcing bars 3 in the laminated slab 1 are arranged at equal intervals, and the reinforcing bars 3 in both layers of laminated slab 1 are arranged at the same intervals, with the reinforcing bars 3 in the two layers of laminated slab 1 staggered. This arrangement causes the steel chord 2.1 between the two layers of laminated slab 1 to be inclined to form a truss structure. The truss structure in this embodiment adopts a W-shaped staggered arrangement.

[0052] Further, see attached document. Figure 2 In this embodiment, the laminated unit 1.3 includes an inner layer unit 1.4 and an outer layer unit 1.5. The outer layer unit 1.5 is disposed on both sides of the laminated plate 1, and the inner layer unit 1.4 is disposed between the two inner layers. The inner layer unit 1.4 includes six layers of bamboo shavings oriented laminated timber 4, and the outer layer unit 1.5 includes three layers of bamboo shavings oriented laminated timber 4. The number of bamboo shavings oriented laminated timber 4 in the inner layer unit 1.4 is set to twice the number of bamboo shavings oriented laminated timber 4 in the outer layer unit 1.5. This arrangement ensures the bending resistance of the inner layer unit 1.4 and facilitates the application of preload to the laminated plate 1.

[0053] Furthermore, in this embodiment, clamping blocks 3.1 and fastening nuts 3.2 are respectively provided at both ends of the fastening reinforcing bar 3. Threads are provided at both ends of the fastening reinforcing bar 3, and the clamping blocks 3.1 have a central opening and are fitted onto both ends of the fastening reinforcing bar 3, abutting against the outer layer unit 1.5. The laminated plate 1 is fastened by the nuts at both ends of the fastening reinforcing bar 3, improving the integrity of the laminated plate 1 and making full use of the surface roughness characteristics of the bamboo shavings oriented laminated material 4.

[0054] Furthermore, in this embodiment, the distance between the openings at both ends of the steel chord 2.1 is equal to the spacing of the fastening reinforcing bars 3 in the laminated plate 1. This arrangement of the steel chord 2.1 results in an angle of 45° between it and the laminated plate 1, leading to more uniform stress distribution on the laminated plate 1. In other embodiments of this embodiment, the distance between the openings at both ends of the steel chord 2.1 can be set to be greater than or less than the spacing of the fastening reinforcing bars 3 in the laminated plate 1, thereby changing the angle between the steel chord 2.1 and the laminated plate 1.

[0055] In this embodiment, the two-layer laminated slab 1 is divided into an upper laminated slab 1.1 and a lower laminated slab 1.2. The upper laminated slab 1.1 serves as the actual support panel. The upper laminated slab 1.1 has n reinforcing bars 3, and the lower laminated slab 1.2 has n+1 reinforcing bars 3. The reinforcing bars 3 in both the upper and lower laminated slabs 1.1 and 1.2 are arranged at the same intervals and are positioned opposite each other. Specifically, in this embodiment, the upper laminated slab 1.1 has 5 reinforcing bars 3, and the lower laminated slab 1.2 has 6 reinforcing bars 3. In actual use, the upper laminated slab 1.1 and the lower laminated slab 1.2 are connected at both ends to steel frame plates and other fasteners and fixed to the foundation. In this embodiment, the steel chord 2.1 is a steel plate in the shape of a parallelogram. When the steel chord 2.1 is stacked between adjacent stacked units 1.3, both ends of the steel chord 2.1 only contact the same stacked unit 1.3 to avoid tilting between the steel chord 2.1 and the bamboo shavings oriented laminated material 4, which would cause uneven stress on the steel chord 2.1 after the stacking and tightening of the reinforcing bars 3.

[0056] Further, see attached document. Figure 5 and Figure 6 The thickness of the portion of the steel chord 2.1 with through holes at both ends is half the thickness of the middle portion. In this embodiment, the two ends of the steel chord 2.1 with through holes are respectively provided with butt grooves 2.2. The thickness of the steel chord 2.1 with the butt grooves 2.2 is half the thickness of the middle portion of the steel chord 2.1. The butt grooves 2.2 at both ends of the steel chord 2.1 are located on the same side of the steel chord 2.1. After two steel chords 2.1 at the same connection point of the fastening reinforcing bars 3 are stacked, the butt grooves 2.2 of the two steel chords 2.1 are aligned and fitted together. Furthermore, the steel chord 2.1 through which the fastening steel bars 3 on both sides of the lower layer slab 1.2 pass has a butt joint groove 2.2 on only one end. The end of the steel chord 2.1 without the butt joint groove 2.2 is passed through the fastening steel bars 3 on both sides of the lower layer slab 1.2. This avoids the situation where only one steel chord 2.1 passes through the connection point of the fastening steel bars 3 on both sides of the lower layer slab 1.2, which would cause the ends of each layer unit 1.3 of the lower layer slab 1.2 to bend after the fastening steel bars 3 are tightened, thus affecting the strength of the ends of the lower layer slab 1.2.

[0057] This embodiment also provides a method for manufacturing a truss-type bamboo shavings oriented laminated timber (OFL) bridge panel, including the following steps.

[0058] First, large-format bamboo shavings oriented laminated timber 4 are sawn to form several 40mm×80mm×6000mm bamboo shavings oriented laminated timber 4.

[0059] Next, select a 22mm diameter reinforcing bar 3 and machine several 22mm holes on the surface of the bamboo shavings oriented laminated timber 4. The holes are set at equal intervals. Machine 22mm holes at both ends of the steel chord 2.1.

[0060] Next, with six layers of bamboo shavings oriented laminated timber 4 as one inner unit 1.4 and three layers of bamboo shavings oriented laminated timber 4 as one outer unit 1.5, and using a five-layer inner unit 1.4 setup, the bamboo shavings oriented laminated timber 4 and steel chord rods 2.1 are sequentially inserted into the holes to secure the reinforcing bars 3.

[0061] Finally, connect the clamping blocks 3.1 and the fastening nuts 3.2 at both ends of the reinforcing bar 3 and apply the tightening force to perform three tightenings, which are completed within one week.

Claims

1. A truss-type bamboo shavings oriented laminated timber (OFL) panel, characterized in that, It includes two parallel laminated slabs. Each laminated slab is composed of several laminated units stacked together and fitted with several fastening steel bars. Each laminated unit is composed of several bamboo shavings oriented laminated timber stacked together. A truss support layer is provided between adjacent laminated units. The truss support layer is composed of several steel chords arranged alternately. The truss support layer is fixed by fastening steel bars from the laminated slabs on both sides.

2. The truss-type bamboo shavings oriented laminated timber (OFL) panel according to claim 1, characterized in that, At least one truss support layer is provided between adjacent stacked units.

3. The truss-type bamboo shavings oriented laminated timber (OFL) panel according to claim 2, characterized in that, The fastening reinforcing bars in each layer of the laminated slab are arranged at equal intervals, the fastening reinforcing bars in two layers of the laminated slab are arranged at the same intervals, the fastening reinforcing bars in two layers of the laminated slab are staggered and opposite each other, and a number of steel chords are arranged in a W-shape.

4. A truss-type bamboo shavings oriented laminated timber (OFL) panel according to any one of claims 1, 2, or 3, characterized in that, The laminated unit comprises at least three layers of the bamboo shavings oriented laminated material.

5. A truss-type bamboo shavings oriented laminated timber (OFL) panel according to claim 4, characterized in that, The laminated unit includes an inner layer unit and an outer layer unit. The outer layer unit is disposed on both sides of the laminated board, and the inner layer unit is disposed between the two inner layers. The ratio of the amount of bamboo shavings oriented laminated material contained in the outer layer unit to the amount of bamboo shavings oriented laminated material contained in the inner layer unit is 1 / 2.

6. A truss-type bamboo shavings oriented laminated timber (OFL) panel according to claim 2, characterized in that, The steel chord has holes at both ends, and the distance between the holes is equal to the spacing of the fastening steel bars in the laminated plate.

7. A truss-type bamboo shavings oriented laminated timber (OFL) panel according to claim 1, characterized in that, The two ends of the fastening steel bar are respectively equipped with clamping blocks and fastening nuts.

8. A truss-type bamboo shavings oriented laminated timber (OFL) panel according to claim 1, characterized in that, The two-layer laminated slab includes an upper laminated slab and a lower laminated slab. The number of fastening reinforcing bars passing through the upper laminated slab is n, and the number of fastening reinforcing bars passing through the lower laminated slab is n+1.

9. A truss-type bamboo shavings oriented laminated timber (OFL) panel according to claim 8, characterized in that, Several steel pads are also inserted through the fastening steel bars at both ends of the lower layer plate, and the steel pads are located between the layer plate unit and the steel chord.

10. A method for manufacturing a truss-type bamboo shavings oriented laminated timber (OFL) panel, used for the truss-type bamboo shavings OFL panel as described in any one of claims 1-9, characterized in that, Includes the following steps: Step S1. Sawing large-format bamboo shavings into oriented laminated timber to form several pieces of bamboo shavings with the same dimensions; Step S2. Based on the diameter of the reinforcing bar, process several holes of the same size on the surface of the bamboo shavings oriented laminated lumber board, and process holes of the same size at both ends of the steel chord. Step S3. Insert several layers of bamboo shavings oriented laminated timber and steel chords into the holes and tighten the reinforcing bars in sequence according to the design width; Step S4. Tighten the fasteners at both ends of the reinforcing bar and apply tightening force.

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