CN201943186U

CN201943186U - FRP pipe-RPC-steel pipe combined member

Info

Publication number: CN201943186U
Application number: CN201020607989XU
Authority: CN
Inventors: 邓宗才; 肖锐; 郭俊平
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2010-11-12
Filing date: 2010-11-12
Publication date: 2011-08-24
Anticipated expiration: 2020-11-12

Abstract

The utility model relates to a fiber reinforced polymer (FRP) pipe-concrete-steel pipe combined member, which is especially applicable to the technical field of light and high-strength steel pipe and concrete structure. The member comprises an inner steel pipe, an outer FRP pipe, and reactive powder concrete (RPC) cast between the inner steel pipe and the outer FRP pipe. The member combines the advantages of RPC and FRP pipe-concrete-steel pipes, makes full use of the FRP, concrete and steel pipes, and facilitates the engineering application of RPC materials. The extending effect of the member is similar to that of the RPC of the pipe, which overcomes the problems that the RPC is fragile and no obvious sign is shown for damage.

Description

FRP pipe-RPC-steel pipe combined member

Technical field

The utility model is FRP (Fiber Reinforced Polymer, a fibre reinforced composites) pipe-concrete-steel pipe combined member, is particularly useful for lightweight, high-strength encased structures technical field.

Background technology

RPC (Reactive Powder Concrete, be abbreviated as RPC), claim ultra-high performance concrete (Ultra High Performance Concrete again, be abbreviated as UHPC), because the difference of its preparation, construction technology, make its mechanical property and deformability all be different from ordinary concrete and high-strength concrete, comprising: non-coarse aggregate reduces flaw size to greatest extent; The admixture steel fibre increases toughness; Use high efficiency water reducing agent, reduce water-cement ratio and porosity; The high temperature maintenance, the hydration reaction of promotion cementitious material.Therefore, compare with high-strength concrete with ordinary concrete, the good advantage of superhigh intensity, high tenacity, high-durability and volume stability is arranged, being applicable to has engineering field high-strength, that lightweight requires to structure.But, the RPC deformation performance that does not add steel fibre is relatively poor, fragility is big, almost there is not sign during destruction, though mix steel fibre certain performance of resisting cracking is arranged, increase toughness of material, and can make RPC present certain plasticity, but effect is limited, mixes the workability that steel fibre has also reduced RPC simultaneously.

Steel pipe RPC combined member, be called for short steel pipe RPC or steel pipe RPC, inherited the every advantage on RPC and the conventional steel concrete performance: the ductility of member improves greatly, and it is big and do not have the problem of obvious sign when destroying to have overcome RPC fragility effectively; In pressurized process,, the compressive strength of RPC and the supporting capacity of cylinder have been improved because steel pipe makes the simple addition of bearing of component greater than RPC and steel pipe bearing capacity to the hoop effect of contraction of RPC; Exempt from formwork, easy construction, fire resistance are good.

But still there is following problem in the steel pipe RPC: RPC is higher to curing requirements, and blocked up RPC is unfavorable for maintenance; The raising of steel pipe RPC bearing capacity has reduced the demand to cross-sectional area, needs to improve bending rigidity in some cases to increase its stability; The RPC consumption is many, the cost height.

FRP pipe-concrete-steel pipe combined member optimum organization FRP, concrete, three kinds of materials of steel pipe, remove the advantage of having inherited traditional concrete filled steel tube combined member, it is big also to have bending rigidity, from advantage such as heavy and light, anti-seismic performance be good, but owing to adopted ordinary concrete and high-strength concrete, the lightweight of this component form, high-strength performance are still waiting further raising.

The utility model content

The purpose of this utility model has been to overcome the above-mentioned defective of existing RPC member, a kind of FRP pipe-RPC-steel pipe combined member is provided, this combined member has improved the compressive strength and the supporting capacity of RPC, improve the ductility of member, reduced creeping of member; Compare with steel pipe RPC combined member, can make RPC obtain abundant maintenance, save the RPC material usage, improve bending rigidity and its stability, the deadweight that alleviates member improves anti-seismic performance, and reduces cost.

To achieve these goals, the utility model has been taked following technical scheme.The utility model comprises that interior steel pipe, outer FRP manage and be filled in the RPC between interior steel pipe and the outer FRP pipe.

Steel pipe and outer FRP pipe longitudinal center's axis coincidence or parallel in described.

Non-filler in the steel pipe in described.

Described RPC is the RPC of mixing steel fibre or not mixing steel fibre.

Steel pipe and outer FRP pipe are straight tube or bend pipe in described.

Steel pipe and outer FRP pipe are uniform section or variable cross-section along its length in described.

Described outer FRP pipe is FRP section bar or the direct fibrous braid that sticks on the RPC external surface that twines.

The cross sectional shape of steel pipe is circular or square or rectangle or ellipse or polygon in described.

The cross sectional shape of described FRP pipe, outer steel pipe be a circle, oval, or smooth square, rectangle, the polygon of corner.

The utility model can also comprise outer steel pipe, and RPC is cast between outer steel pipe and the interior steel pipe, and outer FRP pipe is arranged on the external surface of outer steel pipe.

According to the different situations of outer FRP pipe, the utility model can be taked following different making step:

Whether the heat resistance of the FRP material of no matter selecting for use satisfies the requirement of RPC curing temperature, all can adopt and paste the method that the FRP material forms outer FRP pipe to twining after the maintenance of member outward flange formwork, and concrete making step is as follows:

1) internally steel pipe carries out type selecting and determines the outer peripheral shape of template of member;

2) interior steel pipe is inserted in the same end of steel pipe and template in template and the sealing;

3) RPC is built between interior steel pipe and template, and carry out maintenance;

4) after maintenance was finished, stripping if adopt steel pipe as template, can use steel pipe to simplify construction sequence as the part of member;

5) in the member outer felt around pasting the FRP material, the number of plies need satisfy instructions for use, and makes it be wrapped in the member outside.

When outer FRP pipe requires for section bar and heat resistance can satisfy the RPC curing temperature, can directly adopt the FRP section bar to carry out maintenance as exterior sheathing, concrete making step is as follows:

1) internally steel pipe and outer FRP pipe carry out type selecting;

2) interior steel pipe is inserted in the same end of steel pipe and outer FRP pipe in outer FRP pipe and the sealing;

3) RPC is built in interior steel pipe and outside between the FRP pipe, and carry out maintenance.

FRP pipe-RPC-steel pipe combination component inheritance has also been integrated RPC and the advantage of FRP pipe-concrete-steel pipe combined member, rationally utilized the performance of FRP, concrete, steel pipe three kinds of materials, the engineering that helps the RPC material is used, and mainly has the following advantages:

The ductility effect is similar with the steel pipe RPC, and it is excessive and do not have the problem of obvious sign when destroying to have overcome RPC fragility effectively;

In pressurized process, because steel pipe makes the simple addition of bearing of component greater than RPC and steel pipe bearing capacity to the hoop effect of contraction of RPC;

Compare with steel pipe RPC member, FRP pipe-RPC-steel pipe combined member has improved bending rigidity, has increased stability;

Compare with steel pipe RPC member, under the identical situation of size of outer tube,, keep mechanical property under the situation that its bearing capacity does not reduce, help alleviating the deadweight of member, improve anti-seismic performance by rational design;

RPC has reduced the thickness of RPC, has been more conducive to the maintenance of RPC the higher FRP pipe-RPC of curing requirements-steel pipe combined member;

FRP pipe-RPC-steel pipe combined member is reasonably combined by FRP, RPC and steel, has made full use of the performance of various types of materials, has increased the utilization rate of material.

Exempt from formwork, easy construction.

Description of drawings

Fig. 1 is circular outer FRP pipe cross sectional representation;

Fig. 2 is square outer FRP pipe cross sectional representation;

Fig. 3 is the outer FRP pipe of a rectangle cross sectional representation;

Fig. 4 is oval outer FRP pipe cross sectional representation;

Fig. 5 is the outer FRP pipe of an octagon cross sectional representation;

Fig. 6 is circular interior steel pipe cross sectional representation;

Fig. 7 is square interior steel pipe cross sectional representation;

Fig. 8 is a steel pipe cross sectional representation in the rectangle;

Fig. 9 is oval interior steel pipe cross sectional representation;

Figure 10 is a steel pipe cross sectional representation in the octagon;

Figure 11 is the axle center symmetry FRP pipe-RPC-steel pipe combined member cross sectional representation of circular cross-section for the outer FRP pipe of interior steel pipe;

Figure 12 is circular cross-section for the outer FRP pipe of interior steel pipe for interior steel pipe, and outer steel pipe is the axle center symmetry FRP pipe-RPC-steel pipe combined member cross sectional representation of the circular cross-section of octagonal cross-section;

Figure 13 is a circular cross-section for interior steel pipe, and outer FRP pipe is the axle center symmetry FRP pipe-RPC-steel pipe combined member cross sectional representation of square-section;

Figure 14 is the eccentric FRP pipe-RPC-steel pipe combined member cross sectional representation of circular cross-section for the outer FRP pipe of interior steel pipe;

Figure 15 is a circular cross-section for the interior steel pipe of the outer steel pipe of band, and outer FRP pipe is the FRP pipe-RPC of square-section-steel pipe combined member cross sectional representation;

Figure 16 is FRP pipe-RPC-steel pipe combination right cylinder longitudinal sectional drawing;

Figure 17 is FRP pipe-RPC-curved post longitudinal sectional drawing of steel pipe combination;

Figure 18 is variable cross-section FRP pipe-RPC-steel pipe zygostyle longitudinal sectional drawing;

Among the figure: 1, outer FRP pipe, 2, interior steel pipe, 3, RPC, 4, outer steel pipe.

The specific embodiment

The utility model is described in further detail below in conjunction with accompanying drawing:

Embodiment one:

Adopting the FRP section bar is that outer FRP pipe 1 and heat resistance can satisfy the requirement of RPC curing temperature.

At first internally steel pipe 2 and outer FRP pipe 1 carry out type selecting, and interior steel pipe 2 is inserted in the also same end of steel pipe 2 and outer FRP pipe in the sealing of outer FRP pipe 1; With RPC 3 build in interior steel pipe 2 and outside between the FRP pipe 1, and carry out maintenance.

The typical section form that interior steel pipe 2 can be used such as Fig. 1～shown in Figure 5 include but not limited to circle, square, rectangle, ellipse, polygon, and interior steel pipe 2 can carry out any type selecting in these section forms.

The outer FRP pipe 1 typical section form that can use such as Fig. 6～shown in Figure 10 include but not limited to circle, square, rectangle, ellipse, polygon, and outer FRP pipe 1 can carry out any type selecting in these section forms.

Interior steel pipe 2 and outer FRP pipe 1 can be arranged in pairs or groups arbitrarily.

The collocation of interior steel pipe 2 and outer FRP pipe 1 should be considered the curing requirements of RPC 3, under the situation that RPC 3 thickness are thicker on FRP pipe-RPC-steel pipe zygostyle cross section, should preferentially select the uniform section form of RPC 3 thickness for use, Figure 11～the Figure 13 that is round steel pipe with interior steel pipe 2 is an example, on FRP pipe-RPC-steel pipe zygostyle cross section, the inhomogeneities of RPC 3 strengthens successively.

Generally should adopt the FRP pipe-RPC-steel pipe zygostyle cross section of axle center symmetry, under special circumstances, can consider to adopt eccentric FRP pipe-RPC-steel pipe zygostyle cross section as large eccentric pressuring, as shown in figure 14, and can maybe can satisfy the tensile property that FRP muscle that curing temperature requires improves member by longitudinal reinforcement in the thin tensile region configuration some of steel pipe RPC.

Hollow sandwich steel pipe RPC coupled column can be a right cylinder, as shown in figure 16, also can be curved post, as shown in figure 17; Cross section can be a uniform section in the vertical distribution of member, as Figure 16, shown in Figure 17, also can be variable cross-section, as shown in figure 18, should select for use flexibly according to the actual loading situation.

RPC 3 can add steel fibre, also can not add steel fibre, and under the situation that does not add steel fibre, element bearing capacity slightly descends, and other performance such as ductile performance are still guaranteed, and the workability of RPC improves simultaneously, is easier to preparation.

Embodiment two:

Present embodiment is that making step is different with the difference of embodiment one:

Select circular in steel pipe 2 and as the square outer steel pipe 4 of template; Interior steel pipe 2 is inserted in the same end of steel pipe 2 and outer steel pipe 4 in outer steel pipe 4 and the sealing; With RPC build in interior steel pipe 2 and outside between the steel pipe 4, and carry out maintenance; After maintenance is finished, do not remove outer steel pipe 4, its part as member is used to simplify construction sequence; Around pasting several layers of FRP material 1 until satisfying instructions for use, and make it be wrapped in the member outside at the member outer ring.

Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims

1. FRP pipe-RPC-steel pipe combined member comprises outer FRP pipe (1) and interior steel pipe (2), it is characterized in that: also comprise the RPC (3) that is cast between outer FRP pipe (1) and the interior steel pipe (2).

2. FRP pipe-RPC according to claim 1-steel pipe combined member, it is characterized in that: also comprise outer steel pipe (4), RPC (3) is cast between outer steel pipe (4) and the interior steel pipe (2), and outer FRP pipe (1) is for twining the fibrous braid of the external surface that sticks on outer steel pipe (4).

3. according to claim 1 or the described FRP pipe-RPC of claim 2-steel pipe combined member, it is characterized in that: described outer FRP pipe (1) and interior steel pipe (2) longitudinal center axis coincidence or parallel.

4. according to claim 1 or the described FRP pipe-RPC of claim 2-steel pipe combined member, it is characterized in that: described outer FRP pipe (1) and interior steel pipe (2) are straight tube.

5. according to claim 1 or the described FRP pipe-RPC of claim 2-steel pipe combined member, it is characterized in that: described outer FRP pipe (1) and interior steel pipe (2) are bend pipe.

6. according to claim 1 or the described FRP pipe-RPC of claim 2-steel pipe combined member, it is characterized in that: described outer FRP pipe (1) and interior steel pipe (2) are uniform section along its length.

7. FRP pipe-RPC according to claim 1-steel pipe combined member is characterized in that: described outer FRP pipe (1) is FRP section bar or the direct fibrous braid that sticks on the RPC external surface that twines.

8. according to claim 1 or the described FRP pipe-RPC of claim 2-steel pipe combined member, it is characterized in that: the cross sectional shape of steel pipe (2) is circular or square or rectangle or ellipse or polygon in described.

9. according to claim 1 or the described FRP pipe-RPC of claim 2-steel pipe combined member, it is characterized in that: the cross sectional shape of described FRP pipe (1), outer steel pipe (4) is for circular, oval, or smooth square, rectangle, the polygon of corner.