Beam-penetrating type fabricated bamboo-concrete composite frame structure beam-column joint

Abstract

This invention discloses a beam-column joint in a prefabricated bamboo-concrete composite frame structure with continuous beams. The beam-column joint comprises a lower layer of bamboo fiber composite tube concrete column, an upper layer of bamboo fiber composite tube concrete column, a continuous bamboo beam, and a truncated bamboo beam. After the lower layer of bamboo fiber composite tubes is filled with concrete, the continuous and truncated bamboo beams are installed, followed by the placement of the upper layer of bamboo fiber composite tubes. The end plates of the upper and lower bamboo fiber composite tubes are connected by bolts, and then formwork is erected. Concrete is poured into the core area of ​​the joint and the concrete inside the upper layer of bamboo fiber composite tubes. After the concrete hardens, the beam-column joint is formed. This invention uses a simplified connection process with continuous beams, offering advantages such as good load-bearing capacity, low cost, and ease of construction. The bamboo-concrete composite frame can utilize existing bamboo resources, providing economical and efficient housing construction. It is suitable for bamboo-producing areas and surrounding urban and rural areas, and has the potential for large-scale application.

Description

(I) Technical Field

[0001] This invention relates to the field of building engineering, and in particular to a beam-column joint of a prefabricated bamboo-concrete composite frame structure with continuous beams. (II) Technical Background

[0002] In the current context of green and low-carbon construction, bamboo, with its short growth cycle, lightweight yet high strength, renewability, and low carbon emissions, has become a highly regarded sustainable biomass material in the field of building structures. Bamboo-based composite materials, prepared through industrial processing of raw bamboo, can overcome the problems of variations in size, morphology, and performance of raw bamboo. Their strength exceeds that of engineered wood and is comparable to building materials such as concrete and steel, and their application value in the construction engineering field is gradually being explored.

[0003] However, it should be noted that because bamboo-based composite materials are still in the early stages of application, the high unit cost of pure bamboo structures significantly hinders their widespread adoption. Furthermore, to meet seismic performance requirements, pure bamboo structures typically incorporate numerous metal connectors at component joints, inevitably reducing the effective cross-sectional area and significantly increasing the precision requirements for component fabrication. For frame beam-column joints, the current mainstream approach is a "beam cut-off, column continuous" construction, further increasing the complexity of the beam end section. (III) Summary of the Invention

[0004] This invention addresses the issues of high cost and complex connection structures in existing pure bamboo frame structure beam-column joints by proposing a beam-through prefabricated bamboo-concrete composite frame structure beam-column joint. Combining the structural form of "beam through, column cut-off", it utilizes the combined effect of bamboo fiber composite tubes constraining the core concrete to simplify the complexity of beam-column connections in the frame structure, achieving a balance between structural reliability, construction feasibility, and construction economy, and promoting the high-quality development of green buildings based on low-carbon building materials.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A beam-column joint of a prefabricated bamboo-concrete composite frame structure with through-beam construction includes a lower layer of bamboo fiber composite tube concrete columns, an upper layer of bamboo fiber composite tube concrete columns, through-beams made of bamboo, and truncated bamboo beams. During on-site assembly, the through-beams and truncated bamboo beams are placed on the lower and upper layers of bamboo fiber composite tubes, respectively. The truncated bamboo beams are fixed to the through-beams using L-shaped connectors. After the concrete inside the lower layer of bamboo fiber composite tubes is poured, the through-beams and truncated bamboo beams are arranged first. The upper end plate of the lower layer of bamboo fiber composite tube columns is bolted to the lower end plate of the upper layer of bamboo fiber composite tube columns. A formwork is installed, and concrete in the core area of ​​the joint is poured using the opening, completing the pouring of the concrete inside the upper layer of bamboo fiber composite tubes. The process continues until the concrete hardens. After the formwork is removed, a beam-column joint is formed. The lower bamboo fiber composite pipe concrete column includes a lower bamboo fiber composite pipe and concrete inside the pipe, and the upper bamboo fiber composite pipe concrete column includes an upper bamboo fiber composite pipe and concrete inside the pipe. Both the lower and upper bamboo fiber composite pipes include an upper end plate, a lower end plate, an upper steel joint, a lower steel joint, an embedded core tube, and an outer bamboo fiber coating. The upper and lower end plates are pre-cut to form openings for pouring concrete, and are welded to the upper and lower steel joints respectively. The end of the embedded core tube has a core tube groove, which is embedded in the groove of the steel joint and fixed between the upper and lower steel joints, serving as a non-removable wrapping mold for the outer bamboo fiber coating. After the adhesive hardens, a bamboo fiber composite pipe is formed.

[0007] Preferably, the through-work bamboo beam and the slit-work bamboo beam should be transverse and longitudinal components arranged along the structural plane, respectively.

[0008] Preferably, if the through-type bamboo beam and the cut-off type bamboo beam are made of reconstituted bamboo, holes should be pre-drilled at the ends where L-shaped connectors are provided, with the hole size being 1.0 mm to 1.5 mm larger than the screw.

[0009] Preferably, the surfaces of the through-work bamboo beams and the truncated bamboo beams located in the core area of ​​the node can be provided with rough surfaces, slots, shear connectors, and other structures.

[0010] Preferably, the concrete in the node area can be self-compacting concrete;

[0011] Preferably, the openings in the upper and lower end plates of the column should be slightly larger than the outer cross-section of the upper and lower end steel joints of the column, and the steel joints are then connected by double-sided welding after being embedded in the corresponding steel plates.

[0012] Preferably, the lengths of the upper and lower steel joints of the column are not less than the maximum value among the following three: the long side dimension of the column section, 1 / 6 of the column's net height, and 500 mm.

[0013] Preferably, the total cross-sectional thickness of the embedded core tube is the minimum cross-sectional thickness to meet the winding tension, and the thickness of the steel joint section embedded at its end should be slightly thinner than the rest.

[0014] Preferably, after the embedded core tube is embedded into the upper and lower steel joints of the column, adhesive can be applied from the inside of the tube for further fixation.

[0015] Preferably, the surface roughness of the upper steel joint, the lower steel joint, and the inner interface of the embedded core tube is increased by applying epoxy resin or epoxy mortar.

[0016] Preferably, the wrapping angle of the outer layers of bamboo fiber should be as close as possible to 90° with the longitudinal direction of the bamboo fiber composite tube;

[0017] The beneficial effects of this invention are that, without affecting structural reliability, it offers advantages in terms of convenient construction and controllable cost: based on the combined effect of bamboo-wound composite pipe confining concrete, the load-bearing capacity of the load-bearing frame columns is ensured at a lower cost; without affecting the overall structural seismic performance and the stress in the core area of ​​the nodes, the "beam-through, column-cut-off" construction form simplifies the beam-column node connection structure of the bamboo-concrete composite frame structure, thereby improving on-site assembly efficiency and promoting the economical and efficient application of low-carbon, high-performance building materials in green construction. (iv) Description of the attached drawings

[0018] Figure 1 This is a schematic diagram of the beam-column joint of the beam-through prefabricated bamboo-concrete composite frame structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the component composition of the beam-column joint of the prefabricated bamboo-concrete composite frame structure before the concrete pouring in the core area of ​​the node of the present invention.

[0020] Figure 3 This is a schematic diagram of the connection structure of the beam-column joint of the beam-through prefabricated bamboo-concrete composite frame structure of the present invention.

[0021] Figure 4 This is a schematic diagram of the internal structure of the node core area of ​​the present invention.

[0022] Figure 5 This is a schematic diagram of the mold for the bamboo fiber composite pipe of the present invention.

[0023] Figure 6 This is a schematic diagram of the molding components of the bamboo fiber composite pipe of the present invention.

[0024] Among them, 1-lower layer bamboo fiber composite pipe concrete column; 2-upper layer bamboo fiber composite pipe concrete column; 3-through bamboo beam; 4-cut bamboo beam; 5-lower layer bamboo fiber composite pipe; 6-upper layer bamboo fiber composite pipe; 7-column upper end plate; 8-column lower end plate; 9-concrete inside the pipe; 10-concrete in the core area of ​​the node; 11-bolt; 12-nut; 13-screw; 14-L-shaped connector; 15-pipe; 16-through port; 17-formwork; 18-embedded core tube; 19-column upper end steel joint; 20-column lower end steel joint; 21-steel joint groove; 22-core tube protrusion; 23-outer bamboo fiber wrapping. (V) Detailed Implementation

[0025] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0026] This invention provides a beam-column joint for a prefabricated bamboo-concrete composite frame structure with a through beam, including a lower bamboo fiber composite tube concrete column 1, an upper bamboo fiber composite tube concrete column 2, a through bamboo beam 3, and a truncated bamboo beam 4. The prefabricated bamboo beams 3, 4, 5, and 6 of the bamboo fiber composite pipes are transported to the site and hoisted to the construction floor according to the construction progress. During on-site assembly, the lower bamboo fiber composite pipe 5 is installed first and its internal concrete 9 is poured. The bamboo beam 3 of the through project is hoisted onto the upper end plate 7 of the column of the lower bamboo fiber composite pipe 5. The 4 of the slit project is fixed to the longitudinal side of the bamboo beam 3 of the through project through the L-shaped connector 14. The pilot hole 15 is opened in advance at the connection between the bamboo beam 3 of the through project and the 4 of the slit project. The upper end plate 7 of the column of the lower bamboo fiber composite pipe 5 and the lower end plate 8 of the column of the upper bamboo fiber composite pipe 6 are connected based on bolts 11 and nuts 12. The template 17 is installed and the core area concrete 10 of the node is poured using the opening 16. The internal concrete 9 of the upper bamboo fiber composite pipe 6 is poured. After the concrete is cured, the template 17 is removed to form the beam-column node.

[0027] Both the lower bamboo fiber composite pipe 5 and the upper bamboo fiber composite pipe 6 are composed of an upper end plate 7, a lower end plate 8, an embedded core tube 18, an upper end steel joint 19, and a lower end steel joint 20. The upper end plate 7 and the lower end plate 8 are pre-drilled to form a passage 16 for pouring concrete. The upper end steel joint 19 and the lower end steel joint 20 are welded to the upper end plate 7 and the lower end plate 8, respectively. The upper end steel joint 19 and the lower end steel joint 20 are provided with steel joint slots 21 on the side away from the end plates. The two ends of the embedded core tube 18 are provided with core tube protrusions 22 to be embedded into the corresponding steel joint slots 21. The rotating shaft of the winding equipment is connected to the upper end steel joint 19 and the lower end steel joint 20. Based on the existing bamboo fiber winding method, the outer bamboo fiber 23 is wound onto the permanent mold composed of the embedded core tube 18, the upper end steel joint 19, and the lower end steel joint 20. After the adhesive hardens, the corresponding bamboo fiber composite pipe prefabricated component is formed.

[0028] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A beam-column joint of a prefabricated bamboo-concrete composite frame structure with continuous beams, comprising a lower bamboo fiber composite tube concrete column (1), an upper bamboo fiber composite tube concrete column (2), a continuous bamboo beam (3), and a truncated bamboo beam (4), characterized in that: The through-work bamboo beam (3), the slit-work bamboo beam (4), the lower bamboo fiber composite pipe (5), and the upper bamboo fiber composite pipe (6) are all prefabricated components. During on-site assembly, the lower bamboo fiber composite pipe (5) is installed first, and concrete (9) is poured inside the pipe. The through-work bamboo beam (3) is then hoisted onto the upper end plate (7) of the lower bamboo fiber composite pipe (5). The slit-work bamboo beam (4) is fixed to the longitudinal side of the through-work bamboo beam (3) via an L-shaped connector (14). The upper end plate (7) of the lower bamboo fiber composite pipe (5) is then installed onto the column end plate (7). 7) The lower end plate (8) of the column of the upper bamboo fiber composite pipe (6) is connected by bolts (11) and nuts (12). The template (17) of the core area of ​​the node is installed between the upper end plate (7) and the lower end plate (8). The core area concrete (10) of the node is poured through the opening (16) pre-set on the upper end plate (7) and the lower end plate (8). The concrete (9) inside the upper bamboo fiber composite pipe (6) is poured upward continuously. After the concrete hardens and is cured, the template (17) is removed to form the beam-column node.

2. The beam-column joint of a prefabricated bamboo-concrete composite frame structure with continuous beam penetration as described in claim 1, characterized in that: The through-work bamboo beam (3) and the cut-off bamboo beam (4) have pre-drilled holes (15) at the screw (13) mounting locations of the L-shaped connector (14). The diameter of the holes (15) is 1.0 mm to 1.5 mm larger than the diameter of the screw (13).

3. The beam-column joint of a prefabricated bamboo-concrete composite frame structure with continuous beam connection as described in claim 1, characterized in that: The lower bamboo fiber composite pipe (5) and the upper bamboo fiber composite pipe (6) are both composed of a column upper end plate (7), a column lower end plate (8), an embedded core tube (18), a column upper end steel joint (19) and a column lower end steel joint (20). The column upper end steel joint (19) and the column lower end steel joint (20) are welded to the corresponding column upper end plate (7) and column lower end plate (8) respectively.

4. The beam-column joint of a prefabricated bamboo-concrete composite frame structure with continuous beam connection as described in claim 1, characterized in that: The upper end steel joint (19) and the lower end steel joint (20) of the column are provided with steel joint slots (21) on the side away from the end plate. Both ends of the embedded core tube (18) are provided with core tube protrusions (22), and the core tube protrusions (22) at both ends are respectively inserted into the corresponding steel joint slots (21).

5. The beam-column joint of a prefabricated bamboo-concrete composite frame structure with continuous beam penetration as described in claim 1, characterized in that: The embedded core tube (18), the upper end steel connector (19) of the column and the lower end steel connector (20) of the column are assembled to form a permanent mold that can be wrapped without disassembly. The outer surface of the permanent mold is wrapped with an outer layer of bamboo fiber (23) and hardened and solidified by an adhesive.

Images