Reconstituted bamboo wood-concrete composite beam structure and manufacturing method

Abstract

The invention relates to a recombined bamboo wood-concrete composite beam structure in civil engineering. The structure comprises shear connectors, recombined bamboo wood and ECC concrete. One part of the shear connector is located in the reconstituted bamboo, and the other part of the shear connector is located in the ECC concrete; the shear connector comprises two first steel plates, two second steel plates, two bolts and two nuts. The size of the first steel plate is 40 * 100 * 5 mm, the size of the second steel plate is 40 * 40 * 5 mm, one end point of the edge of the second steel plate is connected with one end point of the long edge of the first steel plate, so that the long edge of the first steel plate and the edge of the second steel plate form an included angle of 90 degrees, and the position, away from the second steel plate, of the first steel plate is drilled; the number of the drill holes is two, the hole diameter of each drill hole is 8 mm, and the drill holes are arranged in the long edge direction. And the two first steel plates are connected through the drilled holes by the nuts and the bolts. The tensile property of the recombined bamboo and the compressive property of the concrete are brought into full play, and the problem of complex bamboo slotting in a traditional bamboo-concrete structure is solved.

Description

Technical Field

[0001] The invention relates to the field of civil engineering, in particular to the field of construction of a reconstituted bamboo-concrete composite beam structure and a manufacturing method in civil engineering. Background Art

[0002] With the increasing shortage of global resources and the urgent need for sustainable development, the choice of building materials is increasingly tending towards environmental protection, renewable and high-performance. Reconstructed bamboo is a high-performance bamboo material made by decomposing and reconstructing natural bamboo. It has excellent mechanical properties and economic benefits and is widely used in building structures. In practical applications, the mixed use of bamboo and concrete can further improve the comprehensive performance of the structure and form a bamboo-concrete structure. The bamboo-concrete structure can not only give full play to the advantages of the compression, bending and shear resistance of reconstructed bamboo, but also control the deformation of the reconstructed bamboo itself through synergy with other materials to improve the bearing capacity.

[0003] However, there is a complex bamboo grooving problem in the traditional bamboo-concrete structure, which becomes a technical problem that needs to be solved urgently. Summary of the invention

[0004] The present application provides a reconstituted bamboo-concrete composite beam structure, characterized in that the structure comprises: a shear connector, a reconstituted bamboo, and ECC concrete; a portion of the shear connector is located in the reconstituted bamboo, and another portion of the shear connector is located in the ECC concrete; wherein the shear connector comprises two first steel plates, two second steel plates, two bolts and two nuts; the size of the first steel plate is 40×100×5mm, the size of the second steel plate is 40×40×5mm, one end point of the side of the second steel plate is connected to one end point of the long side of the first steel plate, so that the long side of the first steel plate and the side of the second steel plate form an angle of 90°, and holes are drilled at a position of the first steel plate away from the second steel plate, the number of the holes is 2, the diameter of the holes is 8mm, and the holes are arranged along the long side direction; the nuts and the bolts connect the two first steel plates through the holes.

[0005] The reconstructed bamboo-concrete composite beam structure provided by the present application, in which the reconstructed bamboo and ECC concrete are connected by a slot-free steel plate, uses only steel plates and bolts to connect the reconstructed bamboo and concrete together, giving full play to the tensile properties of the reconstructed bamboo and the compressive properties of the concrete, simplifying the complex bamboo slotting problem in the traditional bamboo-concrete structure, not only reducing the construction difficulty, but also improving the overall economic benefits and extending the life cycle of the building. Compared with the traditional structure construction, the present invention is more efficient, more environmentally friendly, and more durable, and has a wide range of application prospects.

[0006] The present application also provides a method for manufacturing a reconstituted bamboo-concrete composite beam, which is characterized by comprising: accurately cutting a steel plate into a first steel plate and a second steel plate, wherein the size of the first steel plate is 40×100×5 mm, and the size of the second steel plate is 40×40×5 mm, vertically welding the second steel plate to the first steel plate, and aligning one end point of the long side of the first steel plate with one end point of the side of the second steel plate, and fixing the first steel plate and the second steel plate by spot welding, wherein the first steel plate and the second steel plate form an angle of 90°; drilling holes in the first steel plate at a position away from the second steel plate, wherein the number of the holes is 2, and the diameter of the holes is 8 mm, wherein the holes are arranged along the long side direction; assembling using bolts and nuts, wherein the nuts and the bolts connect the two first steel plates through the holes to form a shear connector; processing bamboo to form reconstituted bamboo; a portion of the shear connector is located in the reconstituted bamboo, and another portion of the shear connector is located in the ECC concrete.

[0007] The present application provides a method for manufacturing a reconstructed bamboo-concrete composite beam that connects reconstructed bamboo and ECC concrete with a slot-free steel plate. The reconstructed bamboo-concrete composite beam manufactured by the invention only uses steel plates and bolts to connect reconstructed bamboo and concrete, giving full play to the tensile properties of reconstructed bamboo and the compressive properties of concrete, simplifying the complex bamboo slotting problem in traditional bamboo-concrete structures, not only reducing the construction difficulty, but also improving the overall economic benefits and extending the life cycle of the building. Compared with traditional structural construction, the present invention is more efficient, more environmentally friendly, and more durable, and has a wide range of application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 Shown is a schematic diagram of the first steel plate and the second steel plate in a welded shear connector.

[0009] Figure 2 Shown is a schematic diagram of the first steel plate in the shear connector.

[0010] Figure 3 Shown is a schematic diagram of bolts and nuts in a shear connector.

[0011] Figure 4 Shown is a schematic diagram of the bamboo material after the shear connector is assembled and reassembled.

[0012] Figure 5 Shown is a schematic diagram of the assembled reconstituted bamboo-ECC concrete composite beam.

[0013] Figure 6 Shown is a front view of the assembled reconstructed bamboo-ECC concrete composite beam.

[0014] Figure 7Shown is a schematic diagram of the structure of the shear connector. DETAILED DESCRIPTION

[0015] The present invention provides a reconstituted bamboo-concrete composite beam structure, such as Figure 5 , 6 As shown, the reconstructed bamboo-concrete composite beam structure includes reconstructed bamboo 5, shear connector 9 and ECC (Engineered Cementitious Composites) concrete 8, wherein the shear connector 9 connects the reconstructed bamboo 5 and the ECC concrete 8. A portion of the shear connector 9 is located in the reconstructed bamboo 5, and the other portion is located in the ECC concrete 8.

[0016] The shear connector 9 in the present application is an important component for connecting the reconstructed bamboo material 5 and the ECC concrete 8, and plays a key role in bearing and transmitting force. The shear connector 9 realizes the shearing effect between the reconstructed bamboo material 5 and the ECC concrete 8, and fully combines the two materials, which can not only improve the overall stability of the bamboo-concrete structure, but also effectively disperse and transfer the load, so that the performance of different materials can be fully utilized. Among them, ECC concrete is a high-ductility, high-strength cement-based composite material with excellent strength-to-weight ratio, crack resistance and durability. The application of ECC concrete in bamboo-concrete structures can significantly improve the crack resistance and durability of the overall structure, enhance the reliability of the overall structure, and greatly reduce the dead weight compared to reinforced concrete structures. The addition of ECC concrete makes the bamboo-concrete structure perfectly adapted to the requirements of large-span beams.

[0017] The shear connector 9 provided by the present invention is as follows Figure 1-3As shown in Figures 7 and 8, the shear connector 9 includes two first steel plates 1, two second steel plates 2, two bolts 6 and two nuts 7, wherein one first steel plate 1 and one second steel plate 2 form a steel plate assembly. The size of the first steel plate 1 is 40×100×5mm, and the size of the second steel plate 2 is 40×40×5mm. The second steel plate 2 is vertically connected to the first steel plate 1, wherein one end of the side of the second steel plate 2 is connected to one end of the long side of the first steel plate 1, so that the long side of the first steel plate 1 and the side of the second steel plate form an angle of 90° to achieve the effect of preventing slippage. Drill holes are made in the first steel plate 1 at the long side position away from the second steel plate 2. The number of drill holes is 2 and they are circular holes. The drill holes are arranged along the long side direction and the hole diameter is 8mm, which is conducive to the connection and fixation of the bolts and nuts, and improves the bearing and force transmission performance of the shear connector. The upper and lower drill holes are the first drill hole 3 and the second drill hole 4 respectively, wherein the center position of the first drill hole 3 is 60mm away from the short side position of the first steel plate 1 away from the nut. The center position of the first drilled hole 3 is 20 mm away from the long side edge of the first steel plate 3. The two first steel plates 1 and the two second steel plates 2 respectively form two such steel plate assemblies, and the nuts 7 and bolts 6 connect the two first steel plates 1 through the drilled holes, so that the two steel plate assemblies are connected together to form a shear connector 9.

[0018] The upper half of the first steel plate 1 and the second steel plate 2 are located in the ECC concrete 8, and the lower half of the first steel plate 1 and the bolts 6 and nuts 7 are located in the reconstituted bamboo material 5. Specifically, the upper half 40 mm of the first steel plate 1 and the second steel plate 2 are completely located in the ECC concrete 8, and the lower half 60 mm of the first steel plate 1 and the bolts 6 and nuts 7 are completely located in the ECC concrete 8.

[0019] The present application realizes the shear effect between the reconstructed bamboo material 5 and the ECC concrete 8 through the shear-resistant connector 9, and fully combines the two materials, which can not only improve the overall stability of the bamboo-concrete structure, but also effectively disperse and transfer the load, so that the performance of different materials can be fully utilized.

[0020] The solution provided in this application fully utilizes the tensile properties of reconstructed bamboo and the compressive properties of concrete, solves the complex bamboo slotting problem in traditional bamboo-concrete structures, not only reduces the construction difficulty, but also improves the overall earthquake resistance and economic benefits, and prolongs the life cycle of the building. It depicts a more efficient, environmentally friendly and durable approach for sustainable development and earthquake resistance of building structures, and has broad application prospects.

[0021] The present invention also provides a method for manufacturing a reconstituted bamboo-concrete composite beam structure, the manufacturing process of which includes steel plate manufacturing, bamboo material processing, connector installation, formwork erection, concrete mix and pouring, and maintenance. Specifically:

[0022] Steel plate production: The steel plate is made of low-carbon alloy steel, which is precisely cut into two steel plates of different sizes, namely the first steel plate 1 and the second steel plate 2. The size of the first steel plate 1 after cutting is 40×100×5mm, and the size of the second steel plate 2 after cutting is 40×40×5mm. The second steel plate 2 is vertically welded to the first steel plate 1 and one end point of the long side of the first steel plate 1 is aligned with one end point of the side of the second steel plate 2, so that the long side of the first steel plate 1 and the side of the second steel plate form an angle of 90°. First, the first steel plate 1 and the second steel plate 2 are fixed together by spot welding. The long side of the first steel plate 1 and the side of the second steel plate 2 are fixed, and the first steel plate 1 and the second steel plate 2 form an angle of 90° to prevent slippage. Then, start welding from one end of the long side of the first steel plate 1 evenly and continuously along the contact surface. After welding, check the quality of the weld to ensure that there are no obvious defects. The effect is as follows: Figure 1 shown.

[0023] Bamboo processing: Soften and loosen the bamboo, roll it into uniform bamboo strands to ensure the consistency of the material. Then go through the process of "drying - gluing - drying again" to ensure the adhesion of the adhesive and give the bamboo a certain strength. Finally, use hot pressing to form standard reconstituted bamboo5.

[0024] Figure 2 is a schematic diagram of the first steel plate 1, using precise tools to Figure 2 Drill holes at the positions shown. Specifically, drill holes at the long side position away from the second steel plate 2 in the first steel plate 1. The number of drill holes is 2, and they are circular holes. The drill holes are arranged along the long side direction, and the hole diameter is 8 mm, which is conducive to connection and fixation with nuts, and improves the bearing and force transmission performance of the shear connector. The upper and lower drill holes are the first drill hole 3 and the second drill hole 4, respectively. The center position of the first drill hole 3 is 60 mm away from the short side position of the first steel plate 1 away from the nut. The distance between the center position of the first drill hole 3 and the long side edge of the first steel plate 3 is 20 mm. Such a design can improve the overall stability of the bamboo-concrete structure.

[0025] Connector installation: Use high-strength hexagonal M8 bolts 6 for assembly. The M8 bolts 6 are hexagonal with a diameter of 8mm and a height of 140mm. The dimensions are as follows: Figure 3 As shown. The number of M8 bolts is 2, and their quality and specifications are ensured to meet the relevant standards. Use two M8 bolts to connect the first drilling hole 3 and the second drilling hole 4 to the reconstructed bamboo material 5 respectively. The ends of the M8 bolts 6 are fixed with nuts 7 and then welded to form a shear-resistant connector 9 to prevent it from falling off. The assembled finished product is as shown Figure 4 shown.

[0026] Formwork erection: 130mm wide formwork is overlapped on both sides of the reconstructed bamboo 5 as the bottom formwork. A 100mm high side formwork is erected outside the bottom formwork, and the length direction formwork is erected 3000mm to ensure that it can be reused after demolding. A fixed limit wood strip is fixed on the top of the side formwork to ensure that the upper and lower dimensions of the concrete are consistent.

[0027] Concrete mix and pouring: pour concrete in the formwork. ECC concrete does not contain coarse aggregate. Fine aggregate needs to be sieved to improve the uniformity of the internal structure and reduce internal defects of the material. When adding fibers, the cement should have a certain plasticity to facilitate the uniform dispersion of fibers. Stir thoroughly before filling the mold, fill the mold at one time, and vibrate thoroughly. Ensure that the properties of the concrete are stable. Finally, smooth the surface before the initial setting of the concrete. The finished product is as follows: Figure 5 shown.

[0028] Curing: Curing at room temperature. After reaching a certain strength, the formwork is removed and the film is covered to maintain humidity for more than two weeks to ensure the strength of the concrete. Figure 6 shown.

[0029] The present application realizes the shear effect between the reconstructed bamboo material 5 and the ECC concrete 8 through the shear-resistant connector 9, and fully combines the two materials, which can not only improve the overall stability of the bamboo-concrete structure, but also effectively disperse and transfer the load, so that the performance of different materials can be fully utilized.

[0030] The above content shows and describes the basic principles, main features and advantages of the present invention. It should be noted that the present invention is not limited by the above embodiments, and the descriptions in the above embodiments and the specification are only preferred examples of the present invention and do not limit the present invention. As long as they do not violate the spirit and scope of the present invention, the present invention can also be subjected to various changes and improvements, and these changes and improvements are all within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for manufacturing a reconstituted bamboo-concrete composite beam, characterized in that: It includes the following components: shear connectors, reconstructed bamboo, and ECC concrete.

2. The shear connector according to claim 1, characterized in that: It includes the following components: two first steel plates, two second steel plates, two bolts and two nuts.

3. The shear connector according to claim 2, characterized in that: The size of the first steel plate is 40×100×5mm, the size of the second steel plate is 40×40×5mm, the second steel plate is vertically welded to the first steel plate and one end point of the long side of the first steel plate is aligned with one end point of the side of the second steel plate, and the first steel plate and the second steel plate form an angle of 90°; holes are drilled in the first steel plate at a position away from the second steel plate, the number of holes is 2, the hole diameter of the holes is 8mm, and the holes are arranged along the long side direction; bolts and nuts are used for assembly, and the nuts and bolts connect the two first steel plates through the drilled holes to form a shear-resistant connector.

4. The shear connector according to claim 1, characterized in that: A part of the shear connector is located in the reconstituted bamboo material, and another part of the shear connector is located in the ECC concrete.

5. The method for manufacturing a reconstituted bamboo-concrete composite beam according to claim 1, characterized in that: The shear connector is connected to the reconstructed bamboo material by drilling holes in the reconstructed bamboo material and then connecting them with bolts.

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