Recombined bamboo-concrete composite beam applying horizontal steel plates and angle steel connecting pieces

Abstract

The utility model relates to the field of bamboo-concrete composite structures in civil engineering, and mainly discloses a recombined bamboo-concrete composite beam applying horizontal steel plates and angle steel connecting pieces. Comprising angle steel, steel plates, bolts, recombined bamboo beams and concrete. The steel plate is drilled, the bolts are installed and welded, the angle steel is welded to the other face of the steel plate, and a stable connecting frame is formed. And grooving and drilling are conducted at the specific bamboo positions, high-quality epoxy resin glue is injected into groove holes of the bamboo beams, then the manufactured connecting pieces are placed and fixed till the glue is completely solidified, and finally a formwork is built and concrete is poured. By means of the innovative connecting piece design, the technical problems of the bamboo-concrete composite beam in the aspects of shear resistance and connecting interface stability are solved. The innovations not only improve the structural performance of the composite beam, but also increase the durability of the composite beam, so that the composite beam is more suitable for various engineering applications.

Description

Technical Field

[0001] The present invention relates to the field of bamboo-concrete composite structures in civil engineering, and mainly invents a reconstructed bamboo-concrete composite beam using a horizontal steel plate + angle steel connector. The following is its application background. Background Art

[0002] With the rapid rise of my country's economy, urban and rural construction has developed rapidly, which has also led to a continuous increase in the demand for concrete. However, the production process of concrete is accompanied by huge energy consumption and greenhouse gas emissions, which has a serious impact on the environment. In order to meet the urgent needs of sustainable development, the construction industry is actively seeking environmentally friendly alternative building materials. Bamboo, as an ideal green building material, has received widespread attention. Its manufacturing process causes almost no pollution to the environment, and it performs well in mechanical properties, meeting the needs of industrialized production. my country has abundant bamboo resources, and bamboo grows much faster than most trees, which makes bamboo a major trend in the current field of building materials.

[0003] Compared with traditional reinforced concrete structures, bamboo is a natural fiber composite material with relatively low stiffness. Concrete has high compressive strength and large stiffness, so the combination of bamboo and concrete can significantly improve the stiffness of the overall structure. In addition, in bamboo-concrete composite structures, the tensile strength of concrete is relatively low, and the introduction of bamboo gives the structure a certain flexibility and ductility. Bamboo has good deformation and energy absorption capabilities and can deform significantly before failure, thereby enhancing the elastic response of the structure to dynamic or cyclic loads. Bamboo-concrete composite structures can give full play to the advantages of bamboo and concrete materials, fully combining the compressive strength of concrete and the tensile strength of bamboo, and thus become an effective means to solve the insufficient mechanical performance of bamboo beams. However, the key to the composite structure lies in the design of connectors. These connectors are responsible for connecting bamboo and concrete materials together to ensure that the upper and lower sections form an integral force system to withstand the longitudinal shear force between the two materials. The performance of the connectors directly affects whether the composite structure can perform the expected structural performance. When the connector configuration is insufficient, the bamboo-concrete interface may slip, resulting in the inability to fully exert the strength of the two materials, thereby affecting the performance of the overall structure. Therefore, the present invention proposes an innovative connector design, which adopts a combination of horizontal steel plates and angle steels to enhance the strength of the bamboo-concrete interface and ensure that they can fully work together to improve the performance of the overall structure. This innovative connector design provides a more feasible solution for the application of sustainable building materials and provides technical support for the construction industry to move towards a more environmentally friendly and sustainable future. Summary of the invention

[0004] In order to enhance the shear resistance of the reconstructed bamboo-concrete composite beam, the present invention designs a new type of horizontal steel plate + angle steel connector, using a grooved shear connector. By adding a 30mm thick steel plate, the local stress is improved, thereby enhancing the shear resistance of the composite beam.

[0005] In order to reduce the excessive stress concentration at the composite beam connector, the present invention designs a new type of horizontal steel plate + angle steel connector and introduces angle steel connectors. These connectors have strong shear resistance and shear stiffness, and increase the contact area of ​​the connection interface, effectively reducing the risk of excessive stress concentration at the connector and ensuring the common force of the bamboo-concrete composite structure.

[0006] The technical solution of the present invention is achieved in this way:

[0007] First, the shear connector is made: a steel plate is prepared, holes are drilled precisely at the desired locations, and then bolts are installed and welded. This process ensures the structural integrity of the connection. Then, angle steel is welded to the steel plate according to the design requirements to form a stable connection frame.

[0008] Further, the wooden beams are made: bamboo tubes are used as raw materials, first split into thin strips, and further pressed to form bamboo strips. For the bamboo strips, they undergo hydrolysis and impregnation processes to improve their durability and strength. Grooving and drilling are performed at specific locations of the bamboo, which is a step to prepare for the installation of subsequent connectors.

[0009] Furthermore, the connector installation process involves injecting high-quality epoxy resin glue into the groove holes of the bamboo beams, and then placing and fixing the prepared connectors until the glue is completely solidified. This method improves the structural integrity and load-bearing capacity of the connection.

[0010] Furthermore, diagonal braces are installed on both sides of the bamboo beam to construct a bottom form and side forms on both sides, and limiting wooden strips are placed on the top of the side forms.

[0011] Further, the concrete mix ratio is adjusted, poured, and vibrated to ensure compaction. After surface treatment, the concrete is cured at room temperature for two days, followed by formwork removal and film curing to ensure the stability of concrete strength.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. Enhanced shear resistance: Traditional bamboo-concrete composite beams have limitations in shear resistance, as the relatively low stiffness of bamboo does not match the high compressive strength of concrete. This invention introduces grooved shear connectors, which have very high shear bearing capacity and sliding stiffness based on research by relevant scholars. In addition, by adding a 30mm thick steel plate, local stress is improved, thereby enhancing the shear resistance of the composite beam. This innovation allows the composite beam to better resist shear forces and improves the stability and durability of the overall structure.

[0014] 2. Good plasticity of bolts: The shear connector of the present invention is anchored in the reconstructed bamboo with two bolts. These bolts have good plasticity and can bear part of the load when the composite beam suffers shear failure, which helps to increase the elasticity and durability of the structure. This innovative design improves the reliability of the composite beam and makes it perform better under dynamic loads.

[0015] 3. Increased connection area: Traditional single bolt connectors may cause slippage at the connection interface, limiting the synergistic effect of the two materials. The present invention introduces angle steel connectors, which have strong shear resistance and shear stiffness, and increase the contact area of ​​the connection interface. Compared with a single bolt, this design effectively reduces the risk of excessive stress concentration at the connector, ensuring the joint force of the bamboo-concrete composite structure. This innovation improves the overall performance and sustainability of the composite beam.

[0016] In summary, the present invention solves the technical problems of bamboo-concrete composite beams in shear resistance and connection interface stability through innovative connector design. These innovations not only improve the structural performance of the composite beam, but also increase its durability, making it more suitable for various engineering applications. Therefore, the present invention is expected to promote the widespread application of bamboo-concrete composite structures, provide a more feasible material choice for sustainable construction and environmental protection projects, and make an important contribution to environmental protection and sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the structural diagram of the horizontal steel plate + angle steel connection.

[0018] Figure 2 Structural diagram of reconstructed bamboo-concrete composite beam with horizontal steel plate + angle steel connector

[0019] Figure 3 Structural diagram of the cross section of the reconstructed bamboo-concrete composite beam with horizontal steel plate + angle steel connectors for this application DETAILED DESCRIPTION

[0020] The present invention is a reconstructed bamboo-concrete composite beam using a horizontal steel plate + angle steel connector, comprising an angle steel 1, a steel plate 2, a bolt 3, a reconstructed bamboo beam 4, and concrete 5. The specific manufacturing process is as follows:

[0021] 1. Steel plate production and bamboo processing:

[0022] Steel plate production: Select steel Q345 with appropriate strength and durability, and cut and process it into the required shape of steel plate according to design requirements2.

[0023] Bamboo Processing: Bamboo is processed using modern equipment and technology to ensure that the bamboo tubes are evenly split into strips and these strips are pressed into uniform bamboo bundles to improve material consistency.

[0024] 2. Connector production:

[0025] Making bolt connectors: Use M8 hexagonal bolts. Drill holes and install bolts 3 on steel plate 2, then weld to enhance the stability of the connection.

[0026] Angle steel production: Low carbon alloy steel is used, and its precise shape is cut and processed to form angle steel 1 to meet the needs of the connection point.

[0027] 3. Bamboo processing:

[0028] Hydrolysis treatment: During the bamboo strip preparation process, the bamboo strips are treated with an environmentally friendly hydrolysis method to improve their durability and anti-corrosion properties.

[0029] Enhanced bonding: Use environmentally friendly glue or resin to enhance the stability and bonding of the bamboo strips, ensuring that the bamboo fiber bundles can maintain their shape and strength when the concrete is poured.

[0030] 4. Bamboo beam 4 pretreatment:

[0031] Groove Slotting: Use precise tools to make grooves, ensure that the depth and shape of the grooves meet the design requirements, and reduce the unevenness of the bottom of the grooves. The groove spacing is 200mm.

[0032] Hole drilling: Use professional tools and equipment to accurately drill holes at the bottom of the groove, ensuring that the diameter and depth of the holes meet the requirements of the connector. The hole diameter is 7mm and the depth is 90mm.

[0033] 5. Installation of connectors:

[0034] Use epoxy glue: Inject high-quality epoxy glue into the groove holes of the bamboo beam to ensure a firm bond of the connectors, while waiting enough time to ensure that the resin glue is completely solidified.

[0035] 6. Formwork erection:

[0036] Use reusable formwork: Consider using reusable formwork materials to reduce waste and resource consumption.

[0037] Precise formwork installation: Ensure that the formwork is installed very accurately to ensure the size and flatness of the concrete slab. Since the bamboo beam can be used as part of the formwork, it is sufficient to add the remaining 130mm wide formwork on both sides. By nailing diagonal braces into the sides of the bamboo beam, a bottom formwork with a length of 2500mm, a width of 130mm on both sides, and a height of 100mm is set up, and then the side forms on both sides are set up, and the limiting wooden strips are fixed on the top surface of the side forms to ensure that the width of the concrete slab is consistent with the design.

[0038] 7. Concrete 5 pouring and smoothing:

[0039] Mix ratio adjustment: Adjust the mix ratio of concrete according to specific requirements and performance requirements to ensure the strength and durability of concrete.

[0040] Vibration process: Use vibration equipment to ensure that the concrete is fully uniform, eliminate bubbles, and improve the density of the concrete.

[0041] Smoothing the surface: Before the concrete begins to set, the surface is smoothed to obtain a smooth surface.

[0042] 8. Composite beam maintenance:

[0043] After 2 days of curing at room temperature, the formwork is removed and film curing is used to ensure the stability of concrete strength.

Claims

1. A reconstructed bamboo-concrete composite beam using a horizontal steel plate + angle steel connector, comprising an angle steel (1), a steel plate (2), a bolt (3), a reconstructed bamboo beam (4), and concrete (5), wherein the angle steel (1) is welded to the steel plate (2), the steel plate is 30 mm thick, the bolt (3) is mounted on the steel plate (2), the bolt (3) comprises two bolts, the two bolts are anchored in the reconstructed bamboo beam (4), the reconstructed bamboo beam (4) forms a plurality of grooves, the plurality of grooves are spaced 200 mm apart, the holes at the bottom of the grooves have a diameter of 7 mm and a depth of 90 mm, and the steel plate + angle steel connector connects the bamboo material and the concrete (5).

Images