CN103015631A

CN103015631A - Built-in polyvinyl chloride (PVC) pipe enhanced square steel pipe concrete combined column

Info

Publication number: CN103015631A
Application number: CN2012105385834A
Authority: CN
Inventors: 陈宗平; 徐金俊; 薛建阳
Original assignee: Guangxi University
Current assignee: Guangxi University
Priority date: 2012-12-13
Filing date: 2012-12-13
Publication date: 2013-04-03

Abstract

The invention discloses a built-in polyvinyl chloride (PVC) pipe enhanced square steel pipe concrete combined column, which comprises a PVC circular plastic pipe, a square steel pipe and concrete, wherein the PVC circular plastic pipe in which the concrete is grouted is embedded in the center of the section of the square steel pipe; and the concrete is grouted in a residual space on the section of the combined column to form a double-sleeve multi-constraint concrete combined column in which one pipe is embedded into another pipe. The combined column has the advantage of improving the comprehensive performance of the square steel pipe concrete column; by the PVC circular pipe, and due to the multiple constraint effect, a constraint effect of the concrete in the column is improved, so that the axial compression strength of the column is improved; furthermore, under the condition that requirements on the bearing capacity and the vibration resistance are met, the sectional area of the column can be greatly reduced by using the cheap PVC plastic pipe, so that the usability of a building space is improved; and the consumption of steel and comprehensive manufacturing cost are reduced.

Description

A kind of built-in pvc pipe strengthens the Concrete-Filled Square Steel Tube coupled column

Technical field

The invention belongs to Concrete-Filled Square Steel Tube coupled column and pvc pipe concrete and combining structure post thereof, particularly a kind of built-in pvc pipe and strengthen the Concrete-Filled Square Steel Tube coupled column.

Background technology

Along with modern high-rise, stride and the development of heavy structure greatly, " steel-concrete combined structure " that combined by steel work and concrete structure obtained using more and more widely owing to having the two common advantage concurrently.The concrete filled steel tube coupled column is a kind of as combining structure, the concrete that Yin Qinei waters is surrounded by outside steel tube place, it crosswisely develops operative constraint, greatly improved the supporting capacity of pillar itself, and the Gao Peigang in cross section leads so that such coupled column has good anti-seismic performance.Scientific research and engineering practice show: every stress performance of Concrete-Filled Square Steel Tube coupled column is poor than the concrete filled steel tube coupled column, and this not only is embodied in the adhesive property between square steel pipe and the concrete interface, but also relates to the aspects such as capacity under axial.Trace it to its cause and be that round steel pipe and square steel pipe are not quite similar to the confinement mechanism of core concrete: the former is diameter because of its cross section axis of symmetry, round steel pipe is identical along each lateral deformation on the same cross section, so that can evenly be retrained behind the concrete compression lateral expansion, binding effect is good thus; And the constraint in square steel pipe cross section mainly concentrates on four bights, squeezes after the lateral deformation of core concrete pressurized and pushes away square steel pipe, and its middle part, every limit steel plate produces flexural deformation, and restriction ability descends, and holistic resistant behavior is just good not as concrete filled steel tube.

Consider the easy of bean column node construction, concrete-filled steel square tubular column has relatively large advantage than concrete-filled circular steel tube column in node processing, is convenient to the connection of beam column.For supporting capacity, workability and the comprehensive construction cost of taking into account concrete-filled steel square tubular column, improve and improve its confinement mechanism and become the key point that expansion Concrete-Filled Square Steel Tube coupled column is applied.

In order to reduce cost and saving steel, national correlation department has just proposed the policy of " to mould Dai Gang " very early, encourages Construction unit's energetic of plastics pipes material to be used for civil works.Polyvinyl chloride (PVC) tubing is widely used in the facilities such as rain (falling) water pipe and underground sewage pipe.Because it has the characteristics such as light weight, inexpensive, corrosion resistance is good, the range of application of pvc pipe will be more and more extensive.Similar to concrete filled steel tube, concrete and pvc pipe material are combined, thereby consist of the pvc pipe concrete, partly or entirely replace concrete filled steel tube, can reach the purpose of saving steel, reduction comprehensive cost.Given this, be necessary to design a kind of new Component composition method, the pvc pipe concrete is combined effectively with the Concrete-Filled Square Steel Tube coupled column, reach the bearing capacity that improves pillar with this, save the purpose of construction cost.

Summary of the invention

The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, provide a kind of built-in pvc pipe to strengthen the Concrete-Filled Square Steel Tube coupled column, adopt the enhancing technology of pipe middle sleeve, by Proper Match pvc pipe caliber, reach part concrete in the strong constraint square steel pipe pipe, improve the whole binding effect of core concrete, strengthen the load-carrying properties of coupled column.

The present invention solves the problems of the technologies described above with following technical scheme:

A kind of built-in pvc pipe strengthens the Concrete-Filled Square Steel Tube coupled column, comprise a PVC round plastic tubing, square steel pipe and concrete, interior pouring has concrete PVC round plastic pipe to be flush-mounted in the center in square steel pipe cross section, concreting in the remaining space in coupled column cross section forms two sleeve pipe multiple constraint concrete combination columns that pipe is arranged in the pipe.

The concrete of building is ordinary concrete, and its compound method is with China's related specifications standard.

The geometric center of PVC round plastic pipe and square steel pipe coincides with a bit.

Technical scheme of the present invention has following advantage with respect to prior art:

1) application of PVC sleeve technology can improve square steel pipe to the concrete binding effect in inside;

2) PVC sleeve technology and square steel pipe are united the inherent concrete of constraint, can form multiple constraint mechanism, further strengthen the axial compression ability of coupled column;

3) under the prerequisite that satisfies the supporting capacity demand, can reduce the use of steel, reduce cost.

Coupled column of the present invention has advantages of and improves the concrete-filled steel square tubular column combination property: the restriction ability of square steel pipe is inferior to round steel pipe, its restriction behavior is embodied in four bights mostly, it is little that middle steel plate participates in the whole contribution degree that retrains, by setting up the PVC pipe, the multiple constraint effect can make its interior concrete binding effect of part improve, and strengthens the axial compression ability of post with this; Secondly, under the demand that satisfies supporting capacity and anti-seismic performance, by using cheap PVC plastic pipe, column cross-section size can reduce greatly, thereby increases the utilization rate of architectural space, reduces the consumption of steel and reduces comprehensive cost.

Description of drawings

Fig. 1 is the cross sectional representation that a kind of built-in pvc pipe strengthens the Concrete-Filled Square Steel Tube coupled column;

Fig. 2 is the space schematic diagram that the built-in pvc pipe of Fig. 1 strengthens each combiner of Concrete-Filled Square Steel Tube coupled column.

Among the figure: 1-PVC round plastic pipe, square steel pipe 2, concrete 3.

The specific embodiment

Pvc pipe is for adopting polyvinyl chloride (Poly Vinyl Chloride) as the circular pipe of material, its material has the superperformances such as good processability, low cost of manufacture, corrosion-resistant, insulation, in addition relatively good geometrical stability and preferably physical and mechanical property, its tensile yield strength 〉=40MPa, modulus of elasticity is about 2749MPa.

Built-in pvc pipe of the present invention strengthens the Concrete-Filled Square Steel Tube coupled column, and profile is the same with original Concrete-Filled Square Steel Tube, and its essence is to increase a PVC round plastic pipe at the middle part, cross section.

When as the bottom column of little high level or highrise building or beneath which floor post, the load (comprising moment of flexure, shearing and axle power) that transmits because of top is larger, particularly axial force is on the impact of column cross-section size, and in order to satisfy the requirement of the required limit value of axial compression ratio of building structure aseismatic, necessarily require column section to have high supporting capacity.The effective means that improves bearing capacity is by enlarging the pvc pipe caliber, increasing the Area Ratio of pvc pipe concrete section and coupled column total cross-section.

When coupled column is the superstructure post of building, because upper load less, consider suitable saving concrete material and reducing construction cost, can suitably reduce column cross-section size along the building height direction, can satisfy requirement for bearing capacity by following means: 1) when more reducing column cross-section size, can increase pvc pipe concrete section ratio; When 2) reducing simultaneously post total cross-section physical dimension, each several part cross section ratio can remain unchanged.Or in order to consider easy construction, under the prerequisite that does not change column cross-section size, can suitably reduce by the way of dwindling the pvc pipe caliber bearing capacity in cross section.

The construction technology that built-in pvc pipe strengthens the Concrete-Filled Square Steel Tube coupled column has dual mode:

ⅰ, elder generation form the pvc pipe concrete at PVC round plastic pipe 1 interior placing of concrete 3, and the making of this pillar can be carried out or specialized enterprises production at the construction field (site).In order to improve construction speed and to accelerate concrete preparation, build and the reliability of maintenance, Carrying out Specialization production can effectively guarantee the intensity of its structure.

Then pvc pipe concrete pillar is flush-mounted in the center in square steel pipe cross section, concreting 3 in the remaining space of coupled column total cross-section, strengthen the Concrete-Filled Square Steel Tube coupled column thereby form built-in pvc pipe..

Or

ⅱ, PVC round plastic pipe 1 is flush-mounted in the center in square steel pipe cross section, concreting 3 in pvc pipe and in whole remaining spaces of coupled column strengthens the Concrete-Filled Square Steel Tube coupled column thereby form built-in pvc pipe again.

Claims

1. a built-in pvc pipe strengthens the Concrete-Filled Square Steel Tube coupled column, it is characterized in that comprising a PVC round plastic pipe, square steel pipe and concrete, interior pouring has concrete PVC round plastic pipe to be flush-mounted in the center in square steel pipe cross section, concreting in the remaining space in coupled column cross section forms two sleeve pipe multiple constraint concrete combination columns that pipe is arranged in the pipe.

2. built-in pvc pipe as claimed in claim 1 strengthens the Concrete-Filled Square Steel Tube coupled column, it is characterized in that the concrete of building is ordinary concrete, and its compound method is with China's related specifications standard.

3. built-in pvc pipe as claimed in claim 1 strengthens the Concrete-Filled Square Steel Tube coupled column, it is characterized in that the geometric center of PVC round plastic pipe and square steel pipe coincides with a bit.