CN202787241U

CN202787241U - Concrete tubular pile

Info

Publication number: CN202787241U
Application number: CN 201220495922
Authority: CN
Inventors: 丁文智; 姜平平; 张佩良; 刘凤松; 陈强; 胡旭东; 李格平; 李德刚; 李刚; 易振
Original assignee: TIANJIN GANGHANG PILE INDUSTRY Co Ltd
Current assignee: TIANJIN GANGHANG PILE INDUSTRY Co Ltd
Priority date: 2012-09-26
Filing date: 2012-09-26
Publication date: 2013-03-13
Anticipated expiration: 2022-09-26

Abstract

The utility model relates to a concrete tubular pile which is characterized by comprising a concrete tubular pile body, a steel reinforcement cage and end plates which are fixed at the two ends of the steel reinforcement cage. The steel reinforcement cage is composed of spiral reinforcing bars and main reinforcing bars. The main reinforcing bars are fixedly connected with the spiral reinforcing bars through nonprestressed reinforcement. The concrete tubular pile has the beneficial effects that stressed method is reasonable. All the main reinforcing bars of the steel reinforcement cage accept HRB 400 reinforcing bars. When the HRB 400 reinforcing bars are cold drawn to improve flexural capacity of the tubular pile, the reinforcing bars can be obtained conveniently, wherein the reinforcing bars are basically with the same stress, and therefore the stress of the tubular pile is even. Horizontal bearing capacity of the tubular pile can be improved greatly by the HRB 400 reinforcing bars. A technological process is convenient and fast. The HRB 400 reinforcing bars are adopted by the main reinforcing bars of the steel reinforcement cage, the spiral reinforcing bars are arranged outside the main reinforcing bars, and therefore connection can be finished through a roll welding method, and manufacturing efficiency of the steel reinforcement cage of the tubular pile is improved. The horizontal bearing capacity of the tubular pile is improved effectively, and usages of the tubular pile are increased, wherein the tubular pile can be used in projects such as a foundation pit, a side slope and an embankment and buildings with an anti-earthquake degree of more than seven.

Description

Concrete tubular pile

Technical field

The utility model belongs to pile tube for building, relates in particular to a kind of concrete tubular pile that improves the pile tube horizontal bearing capacity.

Background technology

In building construction process, the utilization of pile tube is more and more extensive.The horizontal bearing capacity of tradition pile tube is about 1/60 of vertical bearing capacity.At some horizontal bearing capacity is had the engineering of requirement, such as foundation ditch, side slope, embankment and soft clay area and the high buildings pile of antidetonation class requirement, the use of pile tube has very large limitation.The anti-bending strength of prestressed concrete pipe pile is poor, and mode of failure is brittle fracture, and expanding rapidly behind the cracking appears in prestressed concrete pipe pile, and tensile reinforcement reaches yield limit very soon, and its ultimate bending moment and cracking moment are more or less the same.

Not enough in order to overcome the pile tube horizontal bearing capacity, increase the scope of application of pile tube, the nonprestressed reinforcement that adds some in prestressed concrete pipe pile forms a kind of PRC pile tube of novel hybrid reinforcement, the main muscle of its reinforcing cage uses prestressed steel bar to add the matched combined of nonprestressed reinforcement, behind the pile tube matched moulds prestressed steel bar is carried out prestressed stretch-draw, this method can guarantee the vertical bearing capacity of PRC pile tube, and the Effective Raise horizontal bearing capacity.It is inboard at spiral bar that prestressed reinforcement, nonprestressed reinforcement vertically weld colligation in this technical method reinforcing cage, between per two nonprestressed reinforcements two prestressed reinforcements are set at least, this hybrid reinforcement PRC pile tube has improved horizontal bearing capacity and the anti-bending strength of pile tube, overcome the tensile region reinforcing bar and reached very soon the shortcomings such as yield limit and ultimate bending moment and cracking moment are more or less the same, improved the overall performance of pile tube.But this technical method is the Shortcomings part also: (1) this PRC pile tube is stressed unreasonable, prestressed steel bar is little more a lot of than the limiting strain of nonprestressed reinforcement, when bearing horizontal force, the prestressed steel bar strain that reaches capacity very soon, but this moment, the strain of nonprestressed reinforcement was also very little, can not give full play to the large characteristics of nonprestressed reinforcement limiting strain.(2) pile tube is made and is adopted streamline to improve make efficiency, the reinforcing cage of making is welded by the mode of roll welding, the PRC pipe pile reinforcing bar cage of this hybrid reinforcement, need to weld by manually carrying out colligation at nonprestressed reinforcement and spiral bar place, affected the make efficiency of pipe pile reinforcing bar cage.

The utility model content

The utility model is in order to overcome deficiency of the prior art, a kind of concrete tubular pile is provided, have good anti-horizontal bearing capacity and anti-bending strength, when having overcome pile tube and being subject to brittle fracture, rapidly expansion behind the cracking of pipe pile, the tensile region reinforcing bar enters yield limit very soon, the shortcoming that ultimate bending moment and cracking moment are more or less the same.

The utility model for achieving the above object, be achieved through the following technical solutions, a kind of concrete tubular pile, it is characterized in that: comprise concrete tubular pile body, reinforcing cage and be fixed on the end plate at reinforcing cage two ends, described reinforcing cage is made of spiral bar and main muscle, and described main muscle employing nonprestressed reinforcement and spiral bar are affixed.

Described main muscle adopts cold drawn HRB400 reinforcing bar material to make.

Described main muscle is distributed in the spiral bar inboard along the spiral bar y direction.

Beneficial effect: (1) force way is reasonable, reinforcing cage master muscle all uses the HRB400 reinforcing bar, carry out cold drawn when improving the pile tube anti-bending bearing capacity convenient control obtain the essentially identical reinforcing bar of stress, make the PRC pile tube stressed evenly, anti-horizontal bearing force rate prestressed steel bar and the HRB335 reinforcing bar of HRB400 reinforcing bar are much larger, can greatly improve the horizontal bearing capacity of pile tube; (2) technological process is convenient and swift, and the main muscle of reinforcing cage all uses the HRB400 reinforcing bar, arranges spiral bar in the main muscle outside, can use the mode of roll welding to finish connection, improves the make efficiency of pipe pile reinforcing bar cage.The horizontal bearing capacity of energy Effective Raise pile tube increases pile tube in engineering and the uses in the building more than 7 grades of antidetonation grade such as foundation ditch, side slope, embankments.

Description of drawings

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

Fig. 2 is the A-A view.

Among the figure: 1-end plate 2-reinforcing cage 3-master muscle 4-spiral bar 5-concrete tubular pile body

The specific embodiment

Below in conjunction with preferred embodiment, details are as follows to the specific embodiment that foundation the utility model provides: see accompanying drawing for details, a kind of concrete tubular pile, comprise concrete tubular pile body 5, reinforcing cage 2 and be fixed on the end plate 1 at reinforcing cage two ends, described reinforcing cage is made of spiral bar 4 and main muscle 3, and described main muscle employing nonprestressed reinforcement and spiral bar are affixed.Described main muscle adopts cold drawn HRB400 reinforcing bar material to make.Described main muscle is distributed in the spiral bar inboard along the spiral bar y direction.

The course of work

Main muscle uses the HRB400 reinforcing bar in the reinforcing cage, the spiral bar specification should determine that specifically should meet the requirement of spiral bar in the GB13479-2009 table 3, the spacing of pile tube two ends 2m scope inside spin muscle 4 is 45mm according to pile tube external diameter size, the spacing of remainder is 80mm, and allowable variation is ± 5mm.

With the HRB400 reinforcing bar, spiral bar fixed length, cutting die, HRB400 reinforcing bar and spiral bar form reinforcing cage by roll welding, pile end board is put into pipe die after reinforcing cage is fixing, behind the matched moulds HRB400 reinforcing bar is carried out cold drawn to increase its yield strength, at last concrete is fed in the pipe die, carry out centrifugal, maintenance, make prestressed concrete pipe pile.

The above only is preferred embodiment of the present utility model, is not structure of the present utility model is done any pro forma restriction.Every foundation technical spirit of the present utility model all still belongs in the scope of the technical solution of the utility model any simple modification, equivalent variations and modification that above embodiment does.

Claims

1. concrete tubular pile is characterized in that: comprise concrete tubular pile body, reinforcing cage and be fixed on the end plate at reinforcing cage two ends, described reinforcing cage is made of spiral bar and main muscle, and described main muscle adopts nonprestressed reinforcement and spiral bar affixed.

2. concrete tubular pile according to claim 1, it is characterized in that: described main muscle adopts cold drawn HRB400 reinforcing bar material to make.

3. concrete tubular pile according to claim 1 and 2, it is characterized in that: described main muscle is distributed in the spiral bar inboard along the spiral bar y direction.