CN219281081U

CN219281081U - FRP reinforced recombinant bamboo constraint bamboo-concrete combined column

Info

Publication number: CN219281081U
Application number: CN202221580084.7U
Authority: CN
Inventors: 陈思蓓; 魏洋; 宋佩瑶; 陈亮羽; 李页纬; 李丰旭
Original assignee: Nanjing Forestry University
Current assignee: Nanjing Forestry University
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2023-06-30
Anticipated expiration: 2032-06-02

Abstract

The FRP reinforced recombined bamboo-concrete composite column consists of central natural bamboo, sandwiched concrete, protecting layer, recombined bamboo reinforcing layer and FRP reinforcing layer, and features that based on the central natural bamboo, the sandwiched concrete is filled inside the recombined bamboo reinforcing layer, protecting layer is set between the sandwiched concrete and the recombined bamboo reinforcing layer, and the recombined bamboo reinforcing layer has one or more FRP reinforcing layers. The novel combined structure adopted by the utility model utilizes natural bamboo to replace part of concrete, so that the dead weight of the structure is reduced, the concrete consumption is saved, the light high-strength recombined bamboo and FRP sheet material play a role in enhancing the mechanical property in an annular way, the concrete structure is effectively protected, the corrosion resistance and the structural durability are good, meanwhile, the bamboo is fully utilized, the environment is protected, the regeneration is sustainable, and the FRP reinforced recombined bamboo constraint bamboo-concrete combined column can be used for reinforcing and lifting engineering of the structure.

Description

FRP reinforced recombinant bamboo constraint bamboo-concrete combined column

Technical Field

The utility model belongs to the technical field of civil engineering building structures, and particularly relates to a concrete combined structure, in particular to an FRP reinforced recombinant bamboo constraint bamboo-concrete combined column which is applied to reinforcement of various structures.

Background

The first country of bamboo yield is China, and the appearance of the bamboo and the hollow structure of the bamboo greatly limit the application of the bamboo, and the occurrence and application of the recombined bamboo greatly break the limitation, so that the bamboo can be widely applied. The bamboo material has the characteristics of rich resources, quick forming, excellent lumber property and the like, is a high-quality green ecological building material, is processed into long bamboo strips, bamboo filaments or crushed into bamboo filament bundles, is impregnated after being dried, is dried to require water content, is then laid in a mould to be formed under high pressure of about 60MPa, is locked and is sent into a curing channel to be cured and glued, or is directly paved on a hot-pressing backing plate, and is a section bar formed by high-temperature high-pressure thermal curing. The fiber reinforced composite material (FRP for short) is a composite material formed by winding, die pressing or pultrusion and other forming processes of reinforcing fiber materials such as glass fiber, carbon fiber, aramid fiber and the like and matrix materials. FRP has the advantages of light weight, high strength, corrosion resistance, fatigue resistance and the like, has a plurality of applications in the civil engineering field, and can be roughly divided into FRP reinforcing and reinforcing engineering structures, FRP rib concrete structures, FRP structures and FRP combined structures.

The research of the bamboo concrete member is newer in the industry field, and the new reinforced bamboo concrete structure layer in the present stage is endless. For example, chinese patent CN106760214a discloses a solid steel pipe concrete member with octagonal round cross section, the outer edge of the steel pipe cross section is octagonal, the inner edge is round, concrete is poured inside the steel pipe, the round inner surface of the steel pipe can produce ideal constraint effect on concrete, the steel pipe concrete member has extremely high compression performance, but the consumption of concrete material is large, and the member weight is large. And the bamboo concrete still has the defects of local buckling easiness, surface rust and the like under the load effect. For example, chinese patent CN202021269657.5 discloses a concrete structure building containing bamboo, in which bamboo tubes are spliced and fixed. The bamboo concrete member can improve the connection strength and enhance the stability, but the surface of the bamboo tube member is directly exposed in the air, which causes the environmental corrosion of a fixed structure and influences the service time of the member. As disclosed in chinese patent CN201720055205.9, a novel bamboo-concrete-steel bar mixed anchor rod is disclosed, a plurality of steel bars are circumferentially arranged on the inner wall of the anchor rod main body, cement paste is filled in the anchor rod main body, the overall stability is better, but the inside of the anchor rod main body is filled with concrete, the structure is heavy in weight, and the positioning and throwing are not easy.

In conclusion, no matter the bamboo structure or the bamboo concrete structure is adopted, local buckling is easy to occur under the action of load, the use efficiency of materials is reduced, the raw materials are high in price, and the large-scale application is difficult; meanwhile, the surface of the bamboo is subject to environmental corrosion and shortened service life. Therefore, improvement is needed in the situation of self-weight, buckling and corrosion resistance protection of bamboo concrete. In order to overcome the defects, the utility model provides an FRP reinforced recombinant bamboo constraint bamboo-concrete combined column.

Disclosure of Invention

The utility model aims to provide an FRP reinforced recombined bamboo constraint bamboo-concrete combined column, which utilizes natural bamboo to replace part of concrete, lightens the dead weight of the structure and saves the consumption of the concrete. The sandwich concrete is circumferentially restrained by the recombined bamboo, the advantages of the recombined bamboo and the concrete are combined, the recombined bamboo enables the concrete to be in a lateral compression state, the compressive strength of the recombined bamboo can be improved by times, and meanwhile, due to the existence of the concrete, the rigidity of the recombined bamboo is improved, so that the structural bearing capacity is greatly improved. The FRP reinforcing layer continuously wound on the outer surface of the recombined bamboo blocks the corrosion of the external environment to the recombined bamboo, so that the structural strength and deformation can be improved, and the structural durability is also improved. The utility model fully utilizes bamboo resources, is low-carbon and environment-friendly, and highlights the green ecological idea of the building structure.

The technical scheme of the utility model is as follows: the FRP reinforced recombined bamboo-concrete composite column consists of central natural bamboo, sandwich concrete, protecting layer, recombined bamboo reinforcing layer and FRP reinforcing layer, and features that based on the central natural bamboo, the sandwich concrete is filled inside the recombined bamboo reinforcing layer, the protecting layer is set around the interface between the sandwich concrete and the recombined bamboo reinforcing layer, the FRP reinforcing layer is wound around the recombined bamboo reinforcing layer continuously and homogeneously and has overlapping length of not less than 300mm in the circumferential direction, and the protecting layer, the recombined bamboo reinforcing layer and the FRP reinforcing layer are adhered via adhesive.

The natural bamboo in the center of the structure is high-quality natural bamboo, the cross section size of the natural bamboo is smaller than that of the recombined bamboo, the length of the recombined bamboo is identical to that of the natural bamboo, the upper and lower thicknesses of the recombined bamboo are equal, the inside of the recombined bamboo is hollowed to form a gap cavity internal structure, and the cross sections of the natural bamboo and the recombined bamboo reinforcing layer are one of a circular cross section, a rectangular cross section or a chamfer rectangular cross section.

The recombined bamboo reinforced layer body is formed by rolling pretreated bamboos into bamboo bundle filaments, and then steaming, carbonizing, drying, gum dipping, secondary drying, spreading and pressing the bamboo bundle filaments.

A protective layer is arranged between the interlayer concrete and the recombined bamboo reinforced layer, and the protective layer adopts one of a cement-based composite material, a resin-based composite material and an asphalt-based composite material.

The FRP reinforcing layer wound on the outer surface of the recombined bamboo reinforcing layer is one of carbon fiber, basalt fiber, glass fiber or aramid fiber, and the number of winding layers is 1 or more.

The adhesive is one of epoxy resin, phenolic resin, polypropylene resin or polyurethane resin.

Longitudinal steel bars and stirrups can be arranged in the sandwich concrete according to the requirements.

The utility model fully embodies the advantages of natural bamboo, concrete and recombined bamboo, and fully exerts the beneficial effects brought by interaction. Compared with the prior art, the method mainly has the following technical advantages:

(1) The natural bamboo is used for replacing part of concrete, so that the dead weight of the structure is reduced, the consumption of the concrete is saved, and the construction cost is reduced.

(2) The restraint of the sandwich concrete can effectively delay the compression damage of the central natural bamboo, the central natural bamboo and the outer recombined bamboo reinforcing layer respectively provide an outer side template and an inner side template for the pouring of the sandwich concrete, and bear the longitudinal load in the construction process, so that the template manufacturing cost and the construction period are saved, and the construction speed is improved with better economic benefit.

(3) The central natural bamboo and the outer recombined bamboo reinforcing layers respectively provide internal and external restraint for the sandwich concrete, so that the sandwich concrete is in a confining pressure state, and the bearing capacity and the deformation capacity of the sandwich concrete are greatly improved.

(4) The protective layer arranged on the interface between the interlayer concrete and the recombined bamboo reinforcing layer plays a role in isolation, so that the bonding and friction between the interlayer concrete and the recombined bamboo reinforcing layer are greatly reduced, and the effect of the recombined bamboo reinforcing layer on bearing vertical load is reduced.

(5) The FRP reinforcing layer solves the working problems of structural corrosion and special adverse environments, improves the durability of the structure, improves the bearing capacity and deformability of the structure, and prolongs the service life of the structure.

(6) Bamboo resources which can be continuously developed in China are fully utilized, the environment is protected, energy is saved, emission is reduced, and the aesthetic feeling of the building is high.

Description of the drawings:

FIG. 1 is a cross-sectional view of a circular FRP reinforced strand woven bamboo-concrete member;

FIG. 2 is a cross-sectional view of a square FRP reinforced, recombined bamboo-restrained bamboo-concrete member;

FIG. 3 is a cross-sectional view of a chamfered rectangular FRP reinforced strand woven bamboo-concrete member;

in the attached drawings 1-3, 1 is a central natural bamboo, 2 is sandwich concrete, 3 is a protective layer, 4 is a recombined bamboo reinforcing layer, and 5 is an FRP reinforcing layer.

The specific embodiment is as follows:

for a clearer understanding of technical features, objects, and effects of the present utility model, a specific embodiment of the present utility model will be described with reference to the accompanying drawings.

As shown in figure 1, the FRP reinforced recombined bamboo-concrete combined column is composed of a central natural bamboo 1, interlayer concrete 2, a protective layer 3, a recombined bamboo reinforced layer 4 and an FRP reinforced layer 5, and is characterized in that the interlayer concrete 2 is filled in the recombined bamboo reinforced layer 4 based on the structural central natural bamboo 1, the protective layer 3 is annularly arranged at the interface between the interlayer concrete 2 and the recombined bamboo reinforced layer 4, the FRP reinforced layer 5 is annularly and continuously and uniformly wound on the outer surface of the recombined bamboo reinforced layer 4, the overlapping length of the FRP reinforced layer is not less than 300mm along the annular direction, and the protective layer 3, the recombined bamboo reinforced layer 4 and the FRP reinforced layer 5 are mutually bonded through an adhesive.

The natural bamboo 1 in the center of the structure is high-quality natural bamboo, the cross section size of the natural bamboo 1 in the center is smaller than that of the recombined bamboo reinforcing layer 4, the length of the recombined bamboo is identical to that of the natural bamboo, the recombined bamboo is equal to that of the natural bamboo in thickness up and down, the inside of the recombined bamboo is hollowed to form a gap cavity internal structure, and the cross sections of the natural bamboo 1 in the center and the recombined bamboo reinforcing layer 4 are one of a circular cross section, a rectangular cross section or a chamfer rectangular cross section.

The recombined bamboo reinforcing layer 4 body is formed by rolling pretreated bamboos into bamboo bundle filaments, and then steaming, carbonizing, drying, gum dipping, secondary drying, spreading and pressing the bamboo bundle filaments.

A protective layer 3 is arranged between the interlayer concrete 2 and the recombined bamboo reinforced layer 4, and the protective layer 3 adopts one of a cement-based composite material, a resin-based composite material and an asphalt-based composite material.

The FRP reinforcing layer 5 wound on the outer surface of the recombined bamboo reinforcing layer 4 is one of carbon fiber, basalt fiber, glass fiber or aramid fiber, and the number of winding layers is 1 or more.

The interior of the sandwich concrete 2 can be provided with longitudinal steel bars and stirrups as required.

Claims

1. The utility model provides a FRP enhancement mode reorganization bamboo retrains bamboo-concrete composite column, by central natural bamboo (1), intermediate layer concrete (2), inoxidizing coating (3), reorganization bamboo enhancement layer (4), FRP enhancement layer (5) constitute jointly, its characterized in that based on structural center natural bamboo (1), intermediate layer concrete (2) are filled in reorganization bamboo enhancement layer (4) inside, inoxidizing coating (3) hoop sets up at the interface between intermediate layer concrete (2) and reorganization bamboo enhancement layer (4), FRP enhancement layer hoop is evenly twined in reorganization bamboo enhancement layer (4) surface in succession, along hoop overlap joint length not less than 300mm, inoxidizing coating, reorganization bamboo enhancement layer and FRP enhancement layer bond each other through the gluing agent.

2. The FRP reinforced recombined bamboo constraint bamboo-concrete combined column is characterized in that a natural bamboo (1) at the center of the structure is high-quality natural bamboo, the cross section size of the natural bamboo (1) at the center is smaller than that of a recombined bamboo reinforcing layer (4), the length of the recombined bamboo is identical to that of the natural bamboo, the recombined bamboo is equal to that of the natural bamboo in thickness up and down, the inside of the recombined bamboo is hollowed to form a gap cavity internal structure, and the cross sections of the natural bamboo (1) at the center and the recombined bamboo reinforcing layer (4) are one of round cross sections, rectangular cross sections or chamfered rectangular cross sections.

3. The FRP reinforced recombined bamboo constraint bamboo-concrete combined column is characterized in that a protective layer (3) is arranged between the interlayer concrete (2) and the recombined bamboo reinforced layer (4), and the protective layer (3) is made of one of a cement-based composite material, a resin-based composite material and an asphalt-based composite material.

4. The FRP reinforced recombinant bamboo-concrete composite column of claim 1, wherein the adhesive is one of epoxy resin, phenolic resin, polypropylene resin, or polyurethane resin.

5. The FRP reinforced recombined bamboo constraint bamboo-concrete combined column according to claim 1 is characterized in that the FRP reinforced layer (5) wound on the outer surface of the recombined bamboo reinforced layer is one of carbon fiber, basalt fiber, glass fiber or aramid fiber, and the number of winding layers is 1 or more.

6. The FRP reinforced recombined bamboo constraint bamboo-concrete combined column is characterized in that longitudinal steel bars and stirrups can be arranged in the sandwich concrete (2) according to requirements.