CN215802679U

CN215802679U - Rectangular FRP pipe-concrete combined column adopting spiral stirrups

Info

Publication number: CN215802679U
Application number: CN202122373340.7U
Authority: CN
Inventors: 谢剑; 王哲
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2022-02-11
Anticipated expiration: 2031-09-28

Abstract

The utility model discloses a rectangular FRP (fiber reinforced plastic) pipe-concrete combined column adopting spiral stirrups, which comprises a rectangular FRP pipe, wherein a steel reinforcement cage is arranged in the rectangular FRP pipe in a through-length mode, the steel reinforcement cage comprises a plurality of longitudinal reinforcements which are arranged along the vertical direction and are encircled into a cylindrical shape, the spiral stirrups are wound and fixed on the outer walls of the longitudinal reinforcements, epoxy resin glue is respectively coated on the inner wall of the rectangular FRP pipe and the steel reinforcement cage, quartz sand is uniformly adhered to the inner wall of the rectangular FRP pipe and the steel reinforcement cage, and self-compacting concrete is poured in the rectangular FRP pipe. By adopting the structure, the core concrete can be restrained to improve the strength and the ductility of the core concrete, and the corrosion of the external environment to the internal structure can be resisted.

Description

Rectangular FRP pipe-concrete combined column adopting spiral stirrups

Technical Field

The utility model relates to a rectangular FRP pipe-concrete combined column, in particular to a rectangular FRP pipe-concrete combined column adopting spiral stirrups.

Background

Fiber reinforced composite materials have been widely used in the civil engineering field as a concrete constraining material in recent years due to their excellent specific strength and corrosion resistance, among which the most typical applications are: the composite pipe constrains the concrete column. Wherein, the composite material pipe can be manually manufactured by a wet paving method, and can also be directly manufactured by a composite material winding pipe. In view of production automation and good quality control of the filament winding technology, and convenience of construction, the composite winding pipe is the best choice among newly-built composite confined concrete columns.

The columns in actual building or bridge construction are mostly rectangular in cross section, and rectangular columns have many advantages compared to cylinders: 1 when the rectangular column is simultaneously subjected to axial load and bending moment, the side length of the rectangular column can be increased along the bending moment acting direction, the bending rigidity is increased, and the side length is decreased in the other direction, so that the design requirement is met. Compared with a circular cross section, the material is saved. 2 from the construction process, the rectangular column is simpler for the beam column node treatment. 3 from the aspect of building effect, most of rectangular houses are suitable for using rectangular columns, and the rectangular columns are better treated when the rectangular houses are connected with a wall body. However, the constraint strength of the rectangular FRP pipe to the core concrete is greatly reduced compared with that of the circular FRP pipe, which requires to arrange stirrups in the core concrete to improve the constraint effect.

On the other hand, the building industry of China consumes a large amount of fresh water and river sand, which causes serious damages to river beds, water resource environment and ecological environment of a plurality of domestic drainage basins. The seawater and the sea sand in China have abundant resources, are convenient to collect and transport, have low cost and small influence on the environment, and can relieve the resource crisis of fresh water and river sand by reasonably utilizing the seawater and the sea sand. However, chloride ions in seawater and sea sand have strong corrosion effect on the steel bars, and the durability of the structure is seriously influenced.

In summary, according to the analysis of the prior art, the following two problems mainly exist in the current rectangular FRP pipe-concrete column, which makes it impossible to popularize and apply:

1, the rectangular FRP pipe has poor constraint effect on core concrete;

2, the resource crisis of fresh water and river sand can be relieved by reasonably utilizing the seawater and the sea sand, but chloride ions in the seawater and the sea sand have strong corrosion effect on reinforcing steel bars, and the durability of the structure is seriously influenced.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides the rectangular FRP pipe-concrete combined column which is simple in structure, reasonable in stress and convenient to construct and adopts the spiral stirrups.

In order to achieve the purpose, the utility model provides the following technical scheme:

the utility model relates to a rectangular FRP (fiber reinforced Plastic) pipe-concrete combined column adopting spiral stirrups, which comprises a rectangular FRP pipe, wherein a steel reinforcement cage is arranged in the rectangular FRP pipe in a through-length mode, the steel reinforcement cage comprises a plurality of longitudinal reinforcements which are arranged along the vertical direction and are encircled into a cylindrical shape, the spiral stirrups are wound and fixed on the outer walls of the longitudinal reinforcements, epoxy resin glue is respectively coated on the inner wall of the rectangular FRP pipe and the steel reinforcement cage, quartz sand is uniformly adhered to the inner wall of the rectangular FRP pipe and the steel reinforcement cage, and self-compacting concrete is poured in the rectangular FRP pipe.

The utility model has the following beneficial effects:

the utility model is composed of four parts of a rectangular FRP pipe, concrete, a spiral stirrup and a longitudinal bar. The rectangular FRP pipe is manufactured in a factory by adopting a fiber winding process, and has good quality control. The rectangular FRP pipe may constrain the core concrete to improve its strength and ductility and may resist corrosion of the internal structure by the external environment. Meanwhile, the rectangular FRP pipe can also be used as a pouring template, so that the construction speed is increased. The concrete is self-compacting concrete, so that the pouring quality of the concrete can be guaranteed without vibration, and water and sand in the concrete are seawater and sea sand, so that the resource crisis of fresh water and river sand can be effectively relieved. The FRP spiral stirrup and the longitudinal bar are arranged in the concrete, so that the constraint effect on core concrete can be enhanced, and the corrosion problem of the steel bar can be effectively avoided. The sand sticking treatment is carried out on the surfaces of the FRP spiral stirrups and the longitudinal bars and the inner surface of the rectangular FRP pipe, so that the synergistic effect between the FRP spiral stirrups and the concrete can be effectively improved. The rectangular FRP pipe-concrete combined column adopting the spiral stirrups has the advantages of simple structure, reasonable stress, convenience in construction and the like.

Drawings

FIG. 1 is a schematic cross-sectional view of a rectangular FRP pipe-concrete composite column using spiral stirrups of the utility model;

FIG. 2 is a schematic view of the structure of a rectangular FRP pipe in the structure shown in FIG. 1;

fig. 3 is a schematic structural diagram of a reinforcement cage composed of FRP stirrups and FRP longitudinal bars.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in the accompanying drawings, the rectangular FRP tube-concrete combined column adopting the spiral stirrups provided by the utility model comprises a rectangular FRP tube 1, a reinforcement cage is installed in the rectangular FRP tube 1 in a through-length manner, the reinforcement cage comprises a plurality of longitudinal reinforcements 4 which are arranged along the vertical direction and enclose into a cylindrical shape, the spiral stirrups 3 are fixedly wound on the outer walls of the longitudinal reinforcements 4, epoxy resin glue is respectively coated on the inner walls of the rectangular FRP tube 1 and the reinforcement cage, quartz sand is uniformly adhered to the inner walls, preferably, the quartz sand is No. 5 quartz sand with the particle size of about 1mm, self-compacting concrete 2 is poured in the rectangular FRP tube 1, and water and the sand adopt seawater and sea sand.

The self-compacting concrete 2 can avoid vibration, and good pouring quality can be guaranteed. The self-compacting concrete is prepared by adopting the existing preparation method.

The preparation method of the structure comprises the following steps:

binding the FRP spiral stirrup and the FRP longitudinal bar to form a 'steel reinforcement cage', coating epoxy resin glue, and uniformly sticking quartz sand;

secondly, coating epoxy resin glue on the inner part of the rectangular FRP pipe wall, uniformly sticking quartz sand on the epoxy resin glue, and fixing the epoxy resin glue on a flat template;

and step two, placing the bound reinforcement cage in the rectangular FRP pipe, and pouring self-compacting concrete in the reinforcement cage to finish construction.

The structure of the utility model can be used as a bearing column in bridges or building engineering under the corrosive environment such as seashore and the like.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an adopt rectangle FRP pipe-concrete combination post of spiral stirrup, includes rectangle FRP pipe, its characterized in that: the steel reinforcement cage is installed to rectangle FRP pipe well expert long, the steel reinforcement cage include along vertical direction setting and enclose into columniform many and indulge the muscle outer wall on the winding be fixed with the spiral stirrup, rectangle FRP pipe the inner wall on with the steel reinforcement cage respectively brush on with epoxy glue and evenly be stained with quartz sand the rectangle FRP pipe in pour self-compaction concrete.

2. The rectangular FRP pipe-concrete composite column using spiral stirrups of claim 1, characterized in that: the quartz sand is No. 5 quartz sand.