CN102561319A - Composite soil retaining tubular pile with reinforcing bars and manufacturing method thereof - Google Patents

Abstract

The invention provides a composite soil retaining tubular pile with reinforcing bars, which comprises a concrete body and end plates at two ends of the concrete body. A reinforcing cage is arranged in the concrete body and comprises a plurality of main prestress reinforcing bars, non-prestress reinforcing bars and helical reinforcing bars. The invention further provides a manufacturing method of the composite soil retaining tubular pile with reinforcing bars. The composite soil retaining tubular pile with reinforcing bars has the advantages that bending resistance of prestress concrete is effectively improved by the composite soil retaining tubular pile, ductility of the pile body is improved by more than 20%, cracking of the pile body is avoided, and the integral performance of the tubular pile is improved by more than 30%. Besides, the composite soil retaining tubular pile is simple in process, low in cost and high in cost performance and can be widely applied to foundation construction of various soil textures. The problem that the reinforcing bars of the tubular piles in the tension zone are retracted to be cracked is reduced, and the composite soil retaining tubular pile with the reinforcing bars is high in adaptability to geological conditions, particularly geological conditions with the bearing stratum of higher fluctuation, high in concrete strength, compact and resistant to impact and has higher penetrating capacity.

Description

Keep off native compound reinforcement pile tube and preparation method thereof

Technical field

The present invention relates to foundation construction technology in the civil works, native compound reinforcement pile tube of particularly a kind of retaining and preparation method thereof.

Background technology

In the production and construction technology of pile tube, it is poor to exist anti-bending strength, destroys to be brittle fracture at present; Ductility is poor; Exist pile tube to occur carrying out rapidly behind the cracking, the tensile region reinforcing bar gets into very soon surrender and constriction until fracture, ultimate bending moment and cracking moment phenomenon such as be more or less the same.These phenomenons cause pile tube to occur quality accidents such as broken pile, bottleneck stake easily, and particularly in containing the ground of soft soil layer, situation is even more serious.

Summary of the invention

To structural deficiency in the prior art; The purpose of this invention is to provide native compound reinforcement pile tube of a kind of retaining and preparation method thereof, be beneficial to improve effectively the bending resistance of pile tube, avoided in the tube pile construction process; Tilt, displacement is excessive, even the phenomenon of fracture.

For realizing above-mentioned purpose; The technical scheme that the present invention adopts provides the native compound reinforcement pile tube of a kind of retaining; This pile tube includes the end plate at concrete body and two ends; Wherein: in said concrete body, be provided with the cage of reinforcement cage, described cage of reinforcement cage includes many prestressing force master muscle, nonprestressed reinforcement and spiral bars, and said prestressing force master muscle and nonprestressed reinforcement are asymmetric arrangement.

A kind of preparation method of keeping off native compound reinforcement pile tube is provided simultaneously.

The invention has the beneficial effects as follows the anti-bending strength of using this arrangement of reinforcement pile tube to improve prestressed concrete effectively; The ductility that has improved pile body has been avoided the phenomenon of pile body cracking more than 20%, and the overall performance that improves pile tube is more than 30%; And technology is simple; Cost is low, and cost performance is high, is widely used in the foundation construction of various soil properties.The tensile region reinforcing bar of this arrangement of reinforcement pile tube gets into surrender and flexible phenomenon minimizing until fracture very soon; Strong to geological conditions compliance, concrete strength of pile is high, closely knit anti-beating; Stronger penetration capacity is arranged, the big geological conditions of bearing stratum fluctuations is had stronger compliance.

Description of drawings

Fig. 1 is a structural section sketch map of the present invention;

Fig. 2 is the structural representation of cage of reinforcement cage of the present invention and end plate;

Fig. 3 is the structural representation of the present invention in underground activities.

Among the figure:

1, prestressing force master muscle 2, nonprestressed reinforcement 3, spiral bar 4, concrete body

5, fixing end plate 6, cage of reinforcement cage 7, tensile region, two ends

The specific embodiment

Below in conjunction with accompanying drawing native compound reinforcement pile tube of retaining of the present invention and preparation method thereof is explained.

The native compound reinforcement pile tube of retaining of the present invention; This pile tube includes the end plate 5 at concrete body 4 and two ends; In said concrete body 4, be provided with cage of reinforcement cage 6; Described cage of reinforcement cage 6 includes many prestressing force master muscle 1, nonprestressed reinforcement 2 and spiral bars 3, and said prestressing force master muscle 1 is an asymmetric arrangement with nonprestressed reinforcement 2.

Described nonprestressed reinforcement 2 is evenly distributed on the spiral bar 3 in the one side tensile region 7, pile tube cross section, and described prestressing force master muscle 1 is the PC rod iron of tensile strength >=1570Mpa.

The preparation method of the native compound reinforcement pile tube of retaining of the present invention may further comprise the steps:

Earlier with prestressed reinforcement 1, nonprestressed reinforcement 2, spiral bar 3 fixed length, cut off blanking, again with prestressed reinforcement 1 heading, and then spiral bar 3 wire rod cold-drawns are become hand-drawn wire;

Prestressed reinforcement 1 becomes the steel cage with spiral bar 3 roll weldings, again with nonprestressed reinforcement 2 vertical colligations and be evenly distributed on the inboard of the spiral bar 3 in the pile tube tensile zone 7, processes cage of reinforcement cage 6;

Make end plate 5; Then cage of reinforcement cage 6 is put into pipe die with end plate 5; Will be according to the concrete of national pile tube preparation standard GB13476-2009 " Pretensioned spun concrete piles "; Install concrete body 4 feedings in the pipe die of cage of reinforcement cage 6 and end plate 5, carry out prestressed stretch-draw behind the cover mold that closes, nonprestressed reinforcement 2 is not participated in prestressed stretch-draw;

And then will Pipe diePlace and carry out centrifugal forming on the centrifuge, topple over surplus slurry after finishing;

Then the pipe die that centrifugal forming is good is put into steam-cured pond, carries out stream curing by the strength grade of concrete requirement; And then put and open, judge the pile tube credit rating through the Quality Inspector after the demoulding, pile tube entrucking is again gone into still and is carried out steam curing at high pressure, puts into the pile tube yard then, carries out natural curing.

Like Fig. 1, shown in 2, be example with stake type φ 400 * 95, specify the implementation procedure of the native compound reinforcement pile tube of retaining of the present invention function:

Adopt conventional formulation design concrete body 4; Its strength grade is C80; It is the high-strength prestressed concrete steel stick of φ 10.7 that prestressed reinforcement 1 can adopt seven diameters, and its compressive strength is 1570Mpa, the HRB335 screw-thread steel that it is φ 12 that nonprestressed reinforcement 2 can adopt eight diameters.

Earlier with prestressed reinforcement 1, nonprestressed reinforcement 2, spiral bar 3 fixed length, cut off blanking, again with prestressed reinforcement 1 heading, and then spiral bar 3 cold-drawns are become hand-drawn wire; Prestressed reinforcement 1 becomes the steel cage with spiral bar 3 roll weldings, again with nonprestressed reinforcement 2 vertical colligations and be evenly distributed on the inboard of the spiral bar 3 in the pile tube tensile zone 7, processes cage of reinforcement cage 6; Make end plate 5; Then cage of reinforcement cage 6 is put into pile tube with end plate 5; To install in the pipe die of cage of reinforcement cage 6 and end plate 5 according to concrete body 4 feedings of national pile tube preparation standard GB13476-2009, and carry out prestressed stretch-draw behind the cover mold that closes, nonprestressed reinforcement 2 is not participated 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, carry out stream curing by the strength grade of concrete requirement; And then put and open, judge the pile tube credit rating through the Quality Inspector after the demoulding, pile tube entrucking is again gone into still and is carried out steam curing at high pressure, puts into the pile tube yard then, carries out natural curing.

As shown in Figure 3, the arrow direction is the direction from soil pressure among the figure.Should keep off native compound reinforcement pile tube in the construction when underground; Owing to increased nonprestressed reinforcement 2; Can more effectively improve the retaining soil ability of soil blocking pile; Improved the bending resistance shearing resistance and the horizontal bearing capacity of pile tube, particularly in the ground of soft soil layer, this structure can better be brought into play its effect.

Claims (4)

1. one kind is kept off native compound reinforcement pile tube; This pile tube includes the end plate (5) at concrete body (4) and two ends; It is characterized in that: in said concrete body (4), be provided with cage of reinforcement cage (6); Described cage of reinforcement cage (6) includes many prestressing force master muscle (1), nonprestressed reinforcement (2) and spiral bar (3), and said prestressing force master muscle (1) is an asymmetric arrangement with nonprestressed reinforcement (2).

2. the native compound reinforcement pile tube of retaining according to claim 1 is characterized in that: described nonprestressed reinforcement (2) is evenly distributed on the spiral bar (3) in the one side tensile region (7), pile tube cross section.

3. the native compound reinforcement pile tube of retaining according to claim 1 is characterized in that: described prestressing force master muscle (1) is the PC rod iron of tensile strength >=1570Mpa.

4. preparation method of keeping off native compound reinforcement pile tube, this method may further comprise the steps:

Earlier with prestressed reinforcement (1), nonprestressed reinforcement (2), spiral bar (3) fixed length, cut off blanking, again with prestressed reinforcement (1) heading, and then spiral bar (3) wire rod cold-drawn become hand-drawn wire;

Prestressed reinforcement (1) becomes the steel cage with spiral bar (3) roll welding, with vertically colligation and be evenly distributed on the inboard of the spiral bar (3) in the pile tube tensile zone (7) of nonprestressed reinforcement (2), processes cage of reinforcement cage (6) again;

Make end plate (5); Then cage of reinforcement cage (6) is put into pipe die with end plate (5); Will be according to the concrete of national pile tube preparation standard GB13476-2009 " Pretensioned spun concrete piles "; Install concrete body (4) feeding in the pipe die of cage of reinforcement cage (6) and end plate (5), carry out prestressed stretch-draw behind the cover mold that closes, nonprestressed reinforcement (2) is not participated in prestressed stretch-draw;

And then pipe die placed carry out centrifugal forming on the centrifuge, topple over surplus slurry after finishing;

Then the pipe die that centrifugal forming is good is put into steam-cured pond, carries out stream curing by the strength grade of concrete requirement; And then put and open, judge the pile tube credit rating through the Quality Inspector after the demoulding, pile tube entrucking is again gone into still and is carried out steam curing at high pressure, puts into the pile tube yard then, carries out natural curing.

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