CN201512788U

CN201512788U - Horizontal load-bearing enhancement pre-stressed concrete pipe pile

Info

Publication number: CN201512788U
Application number: CN200920223849XU
Authority: CN
Inventors: 许景新
Original assignee: Henan Jianhua Concrete Pile Co Ltd
Current assignee: Hubei Tang Jian Jianhua building materials Co., Ltd.
Priority date: 2009-09-28
Filing date: 2009-09-28
Publication date: 2010-06-23
Anticipated expiration: 2019-09-28

Abstract

The utility model belongs to the architecture engineering technology field, in particular to a horizontal load-bearing enhancement pre-stressed concrete pipe pile, which comprises concretes, a reinforcement cage and end plates fixed on two ends of the reinforcement cage, wherein the reinforcement cage comprises pre-stressed reinforcements, a spiral bar and non-prestressed reinforcements, the pre-stressed reinforcement and the non-prestressed reinforcement are evenly distributed and fixed on the inside of the spiral bar, at least two pre-stressed reinforcements are arranged between each two non-prestressed reinforcements, and the diameter of the pre-stressed reinforcement is equal to or different from that of the non-prestressed reinforcement. The pipe pile changes shortcomings that the prior pipe piles are provided with bad anti-bending performances, brittle failure, bad ductility and rapid spreading after pipe piles are cracked, tension zone reinforcements can quickly enter yield and retrenchment even fracture, and the difference of ultimate bending moments and cracking bending moments is not significant. The pipe pile has the advantages of enhancing entire performances of pipe piles and providing simple process, low cost, high cost performance, broad range of application and the like.

Description

The horizontal bearing reinforced prestress concrete pile tube

Technical field:

The utility model belongs to construction engineering technical field, is specifically related to a kind of horizontal bearing reinforced prestress concrete pile tube.

Background technology:

In building construction process, the utilization of pile tube more and more widely, the horizontal bearing reinforced prestress concrete pile tube is to adopt the method for pressurization in advance to improve concrete tensile strength indirectly, overcome the concrete shortcoming of cracking easily, can delay the cracking of concrete component, improve the crack resistance and the rigidity of member, and obtain the saving reinforcing bar, alleviate the effect of deadweight.

But engineering circle generally believes that the anti-bending strength of pile for prestressed pipe is poor, destroys to be brittle fracture, and ductility is poor, and carrying out rapidly behind the cracking appears in pile for prestressed pipe, and tension goes reinforcing bar to enter surrender and constriction very soon until fracture, and ultimate bending moment and cracking moment are more or less the same.The approach that improves the cracking resistance moment of flexure mainly is to improve the concrete prestressing force of pile for prestressed pipe, promptly improve concrete compressive pre-stress indirectly by pre-tensile stress or the increase number of steel bars that improves prestressed reinforcement, but the pre-tensile stress of prestressed reinforcement is excessive, plastic strain appears in reinforcing bar easily, the easy brittle failure of prestressed reinforcement when being subjected to bend, influence the ductility of pile tube, increase the increase that number of steel bars means cost and construction costs, cost performance is unbalance, and this approach just delays crack on concrete, improve ultimate bending moment and cracking moment, but the not very big actual help of ductility that is more or less the same and improves pile tube for the ultimate bending moment of improving pile tube and cracking moment.Thereby these natural defects that how to improve pile tube have certain engineering significance.

In addition, in the production of pile tube, to the arrangement of reinforcement of pile tube often with reference to the practice of traditional pile foundation uniform reinforcement.In fact, compare with isotropic building pile foundation, the feature of pile tube lateral force of bearing horizontal force is clear and definite, the evenly cloth muscle waste that seems.In actual engineering, for the flexural member of annular such as pile tube etc., adopt symmetrical cloth muscle usually, its operating principle and square-section are similar substantially, but the reinforcing bar of square-section is to arrange along straight line, and pile tube is evenly to arrange along circumference.So, following new feature appears in the stress of pile tube: 1) in the tensile region, cross section, because the reinforcing bar of arranging is different to the distance of cross section horizontal middle spindle, the every muscle that causes thus is stressed also different, form the situation of " long-range closely little ", promptly the tensile stress apart from the neutral axis distance is big, otherwise then little.2) at pressure zone, the moment that only depends on concrete pressure and tensile region reinforcing bar pulling force to be constituted is just enough resisted the load moment of flexure, promptly arranges that at pressure zone distributing bar gets final product, thereby reduces amount of reinforcement, reduces cost.

The utility model content:

In sum, in order to overcome the deficiency of prior art problem, the utility model provides a kind of horizontal bearing reinforced prestress concrete pile tube, it is poor that it has well remedied existing pile for prestressed pipe anti-bending strength, destroy and be brittle fracture, ductility is poor, cracking back rapid spread appears in pile for prestressed pipe, the tensile region reinforcing bar enters surrender very soon and tightens until fracture, shortcomings such as ultimate bending moment and cracking moment are more or less the same improved the overall performance of pile for prestressed pipe, and technology are simple, cost is low, the cost performance height.

For solving the problems of the technologies described above, the technical solution adopted in the utility model is:

A kind of horizontal bearing reinforced prestress concrete pile tube, comprise the end plate 6 that concrete 4, cage of reinforcement cage 5 and cage of reinforcement cage 5 two ends are fixing, wherein, cage of reinforcement cage 5 comprises prestressed reinforcement 2, spiral bar 3 and nonprestressed reinforcement 1, prestressed reinforcement 2 and nonprestressed reinforcement 1 evenly distribute and are fixed on spiral bar 3 inboards, and 1 of per two nonprestressed reinforcement are provided with two prestressed reinforcements 2 at least.

Further, the diameter of the diameter of described prestressed reinforcement 2 and nonprestressed reinforcement 1 or identical or different.

The beneficial effects of the utility model are:

1, it is poor that the utility model has well remedied existing pile for prestressed pipe anti-bending strength, destroy and be brittle fracture, ductility is poor, cracking back rapid spread appears in pile tube, and the tensile region reinforcing bar enters surrender very soon and tightens until fracture, ultimate bending moment and cracking moment shortcoming such as be more or less the same, improved the overall performance of pile for prestressed pipe, and technology is simple, and cost is low, the cost performance height.

2, because the novel stake of the utility model has very high cracking moment and ultimate bending moment, and ductility is improved significantly, can be anti-skidding at the bank protection of water conservancy projectss such as rivers, lake ripple, reservoir, be extensive use of in the engineerings such as dam body soil stabilization, also anti-skidding in side slope maintenance, the side slope of infrastructure such as highway, railway, the pier footing construction, the port and pier foundation construction is reinforced, the deep foundation pit support of industry and civilian construction, fields such as side slope maintenance are extensive use of.

Description of drawings:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the left view of the utility model Fig. 1;

Fig. 3 is the schematic cross-section of structure one of the present utility model;

Fig. 4 is the schematic cross-section of structure two of the present utility model;

Fig. 5 is that bending resistance experiment of the present utility model loads sketch.

The specific embodiment:

The utility model is described in further detail below in conjunction with drawings and Examples.

Embodiment one

As Fig. 1, Fig. 2, shown in Figure 3, present embodiment pile tube external diameter is ￠ 600, its internal diameter is ￠ 300, can adopt conventional formulation design concrete semi-finals degree grade is C60, it is the high-strength prestressed concrete rod iron of ￠ 10.7 that prestressed reinforcement 2 can adopt 12 diameters, its tensile strength is 1570Mpa, and it is the HRB335 screw-thread steel of ￠ 14 that nonprestressed reinforcement 1 can adopt six roots of sensation diameter.

With prestressed reinforcement 2, nonprestressed reinforcement 1, spiral bar 3 fixed length, cut-out blanking, with prestressed reinforcement 2 headings, the wire rod cold-drawn becomes hand-drawn wire more earlier; Prestressed reinforcement 2 becomes the steel cage with spiral bar 3 roll weldings, and with the inboard of the spiral bar 3 in nonprestressed reinforcement 1 vertical colligation and the even whole pile tube that distributes, 1 of per two nonprestressed reinforcement are provided with two prestressed reinforcements 2, make cage of reinforcement cage 5 again; Make end plate 6, cage of reinforcement cage 5 is put into pipe die after end plate 6 is fixed; To install in the pipe die of cage of reinforcement cage 5 and end plate 6 according to concrete 4 feedings of national pile tube preparation standard preparation, and carry out prestressed stretch-draw behind the pipe die that the closes lid, nonprestressed reinforcement 1 does not participate in prestressed stretch-draw; And then pipe die placed carry out centrifugal forming on the centrifuge, topple over surplus slurry after finishing; Then pipe die is put into steam-cured pond, carried out stream curing by the strength grade of concrete requirement; Put after the stream curing open, the demoulding, quality inspection is then gone into still and is carried out steam curing at high pressure after the quality inspection, after put into pile tube and stack, carry out natural curing.

As shown in Figure 5, behind present embodiment pile tube moulding twenty four hours, the present embodiment pile tube is carried out the bending resistance experiment, when the present embodiment pile tube destroys, the top of pile tube (is the boundary with pile tube diameter place) concrete 4 is crushed, and the prestressed reinforcement 2 of bottom and nonprestressed reinforcement 1 do not rupture, article one crack appears from pile tube, the pile tube fracture extension is slow, crack quantity increases fast, but only is 0.5mm at the rupture Breadth Maximum in preceding crack of pile tube, and crack quantity is 16 during destruction, the crack does not extend to pile tube stake top, pile tube bottom prestressed reinforcement 2 and nonprestressed reinforcement 1 fracture lag behind, and the crushing phenomenon appears in top concrete 4, meets the overreinforced component damage form of prestressed concrete, illustrate that the present embodiment pile tube has good ductility, cracking moment and ultimate bending moment differ bigger.

Embodiment two

As shown in Figure 4, repeat embodiment 1, following difference is arranged: it is the high-strength prestressed concrete rod iron of ￠ 10.7 that prestressed reinforcement 2 can adopt 12 diameters, its tensile strength is 1570Mpa, the HRB335 screw-thread steel that it is ￠ 16 that nonprestressed reinforcement 1 can adopt four diameters, prestressed reinforcement 2 and nonprestressed reinforcement 1 evenly distribute and are fixed on spiral bar 3 inboards, and 1 of per two nonprestressed reinforcement are provided with three prestressed reinforcements 2.

Be noted that at last, the above embodiment is to the explanation of technical solutions of the utility model and unrestricted, other modification that is equal to replacement or makes of affiliated technical field those of ordinary skill according to prior art, as long as do not exceed the thinking and the scope of technical solutions of the utility model, all should be included within the desired interest field of the utility model.

Claims

1. horizontal bearing reinforced prestress concrete pile tube, comprise the end plate (6) that concrete (4), cage of reinforcement cage (5) and cage of reinforcement cage (5) two ends are fixing, it is characterized in that: cage of reinforcement cage (5) comprises prestressed reinforcement (2), spiral bar (3) and nonprestressed reinforcement (1), prestressed reinforcement (2) and nonprestressed reinforcement (1) evenly distribute and are fixed on spiral bar (3) inboard, are provided with two prestressed reinforcements (2) between per two nonprestressed reinforcements (1) at least.

2. horizontal bearing reinforced prestress concrete pile tube according to claim 1 is characterized in that: the diameter of the diameter of described prestressed reinforcement (2) and nonprestressed reinforcement (1) or identical or different.