CN102493601A - Hole-type steel tube concrete pier stud - Google Patents

Abstract

The invention discloses a hole-type steel tube concrete pier stud, which comprises a pier stud body, wherein the pier stud body comprises a steel tube, an inner-packed concrete layer and an outer-packed concrete layer; the inner-packed concrete layer is filled in the inner cavity of the steel tube; the outer-packed concrete layer is poured around the steel tube; and the inner-packed concrete layer, the steel tube and the outer-packed concrete layer are connected into a whole by through holes arranged in the tube wall of the steel tube. Therefore, the hole-type steel tube concrete pier stud has a better load bearing performance and is convenient to construct, complex reinforcement processes are avoided, and the problems of corrosion prevention and internal disengaging of the steel tube concrete are effectively solved.

Description

Concrete filled steel pipe piers

technical field

The invention relates to a composite structure pier column, in particular to a steel-concrete pier column with a hole-type steel pipe as the central steel skeleton.

Background technique

At present, commonly used steel-concrete pier columns are generally formed by pouring concrete into steel pipes. This kind of steel-concrete pier column has the following advantages: 1. The restraining effect of the steel pipe on the concrete improves the brittleness of the concrete and greatly increases the strength of the concrete; 2. The concrete is filled in the inner cavity of the steel pipe, which effectively delays the local buckling. Therefore, due to its excellent mechanical properties, this type of steel-concrete pier column is widely used in engineering practice. However, this steel-concrete pier column has the following limitations: 1. The outer wall of the steel pipe is exposed to the air and is prone to corrosion, which affects its stress. Therefore, the rust prevention of the steel pipe needs to be considered in engineering practice. Generally speaking, The anti-rust treatment method with low cost has poor durability; while the anti-rust method with better effect has higher cost. At present, the commonly used anti-rust method for the outer wall of the steel pipe is to form an external concrete layer by pouring the outer wall of the steel pipe (the concrete itself is Alkaline, it has the anti-rust function for steel pipe outsourcing concrete and steel), however, the outer wall of the steel pipe is usually smooth, and the concrete poured directly on the outside of the steel pipe is easy to fall off, and cannot play the role of anti-rust. In actual engineering, it is usually first to weld mesh steel bars or studs on the outside of the steel pipe to make the outer wall of the steel pipe rough, and then pour the outsourcing concrete layer to ensure that the outsourcing concrete layer is connected with the original steel pipe concrete structure as a whole. However, the method of welding mesh steel bars or studs requires high welding technology, and the welding workload is huge. If the wall of the steel pipe is thin, there may be a phenomenon of burning through the steel pipe wall during welding; 2. There is shrinkage of the concrete filled in the steel pipe, and the possibility of internal hollowing of the steel pipe concrete will affect the integrity of the steel pipe concrete.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a hole-type concrete-filled steel pipe pier column, which has better load-bearing performance, avoids complicated reinforcement procedures, and is easy to construct; effectively solves the problem of anti-corrosion and internal detachment of steel-filled steel pipe concrete. empty problem.

For realizing above technical purpose, the present invention will take following technical scheme:

A hole-type concrete-filled steel pipe pier, comprising a pier body, the pier body comprising a steel pipe, an inner concrete layer and an outer concrete layer; the inner concrete is filled in the inner cavity of the steel pipe, and the outer concrete is poured on the periphery of the steel pipe, the inner concrete The layer, the steel pipe and the outsourcing concrete layer are connected into one body through the through holes provided on the pipe wall of the steel pipe.

The through holes are uniformly distributed in a rectangular array or distributed in a dislocation manner.

The cross-section of the pier body is set in a circle or a rectangle.

The through hole opened on the pipe wall of the steel pipe is a circular hole or a square hole.

According to the above technical scheme, the following beneficial effects can be achieved:

The perforated concrete-filled steel pipe pier structure proposed by the present invention still retains the mechanical performance advantages of the concrete-filled steel pipe structure itself. The outsourcing concrete and inner filling concrete are poured at the same time, and are connected as a whole through the holes in the steel pipe wall. There is no phenomenon that the outsourcing concrete and the steel pipe are not firmly connected and fall off, and it has a good antirust function for steel. At the same time, although the internal concrete also shrinks, the connection with the external concrete restricts its shrinkage and voiding as a whole. The use of hole-type steel pipes instead of steel bars has better bearing capacity, avoids complicated reinforcement, and is easy to construct.

Therefore, compared with the prior art, the present invention has the following advantages:

One is good integrity. The outsourcing concrete and the inner filling concrete are connected as a whole through the holes in the wall of the steel pipe, which can prevent the rust of the steel pipe and prevent the hollowing of the concrete inside the steel pipe.

The second is superior force performance. The perforated concrete-filled steel tube structure has the mechanical advantages of concrete-filled steel tubes, and the steel tubes and concrete are mutually restrained to improve the overall mechanical performance of the structure.

Third, the contact structure is simple and the connection is reliable. The steel bar of the transverse part can be directly inserted in the through hole of the wall of the hole-type steel pipe pipe, and can be poured with the hole-type steel pipe concrete pier as a whole.

Fourth, the structure is simple and the construction is convenient. Hole-type steel pipe processing can be mass-produced only by adding a hole-opening process to the existing steel pipe processing method. The perforated steel pipe replaces the reinforcement, and also avoids a large number of complicated reinforcement binding and welding. The outsourcing and inner filling concrete can be formed with only one pouring.

Description of drawings

Fig. 1 is a schematic diagram of the structure of a circular cross-section hole type concrete filled steel pipe pier;

Fig. 2 is a schematic diagram of the structure of a rectangular section hole type concrete filled steel pipe pier;

Fig. 3 is a three-dimensional structural schematic diagram of the steel pipe of the present invention;

Fig. 4 is a kind of expanded distribution schematic diagram that the pipe wall of steel pipe is provided with circular through hole;

Fig. 5 is another kind of expanded distribution schematic diagram that the pipe wall of steel pipe is provided with circular through hole;

Fig. 6 is a kind of expanded distribution schematic diagram that the pipe wall of steel pipe is provided with square through hole;

Fig. 7 is another kind of expanded distribution schematic diagram that the pipe wall of steel pipe is provided with square through hole;

In Fig. 1-7: perforated steel pipe 1; through hole 11; inner concrete layer 2; outer concrete layer 3.

Detailed ways

The accompanying drawings disclose, without limitation, the structural schematic diagrams of the preferred embodiments involved in the present invention; the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

the

As shown in Figures 1 to 7, the perforated concrete-filled steel pipe pier according to the present invention includes a pier body, which includes a steel pipe, an inner concrete layer and an outer concrete layer; the inner concrete is filled in the inner cavity of the steel pipe, and the outer Concrete is poured on the periphery of the steel pipe, and the inner concrete layer, the steel pipe and the outer concrete layer are connected into one body through the through holes provided on the pipe wall of the steel pipe. The through holes are evenly distributed in a rectangular array (as shown in Figure 4 and Figure 6 ) or distributed in a dislocation (as shown in Figure 5 and Figure 7 ). The cross section of the pier body is circular (as shown in FIG. 1 ) or rectangular (as shown in FIG. 2 ). The through holes provided on the pipe wall of the steel pipe are circular holes (as shown in Figure 4 and Figure 5 ) or square holes (as shown in Figure 6 and Figure 7 ).

During construction, the outer mold of the pier column is erected first, the hole-type steel pipe is installed in place, and then the concrete is poured. For the node position, the horizontal reinforcement can be inserted in the through hole to form an effective connection. Steel bars can be interspersed in the through holes for pouring connection of transverse members.

Claims (4)

1. A hole-type concrete-filled steel pipe pier column, comprising a pier column body, which includes a steel pipe, an inner concrete layer and an outer concrete layer; the inner concrete is filled in the inner cavity of the steel pipe, and the outer concrete is poured on the periphery of the steel pipe, its characteristics In that: the inner concrete layer, the steel pipe and the outer concrete layer are connected into one body through the through hole provided on the pipe wall of the steel pipe. 2. The perforated concrete-filled steel pipe pier according to claim 1, wherein the through-holes are evenly distributed in a rectangular array or dislocated. 3. The perforated concrete-filled steel pipe pier according to claim 1, wherein the pier body has a circular or rectangular cross-section. 4. The perforated concrete-filled steel pipe pier according to claim 1, characterized in that: the through-holes opened on the pipe walls of the steel pipes are circular holes or square holes.

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