Novel construction method for non-bonded prestressed pouring uplift pile
A construction method and non-bonded technology, which can be used in infrastructure engineering, sheet pile walls, buildings, etc., can solve problems such as low construction efficiency and deformation of steel cages, and achieve the effects of improving construction efficiency, enhancing durability, and technological progress.
Active Publication Date: 2021-12-31
CHINA CONSTR THIRD ENG BUREAU GRP CO LTD +1
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Problems solved by technology
[0006] The invention provides a new type of construction method for unbonded prestressed grouting uplift piles, which solves the technical problems that the unbonded prestressed grouting uplift piles are easily deformed and the construction efficiency is low during construction.
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Embodiment 1
[0045] see Figure 1-5 , the present invention provides a new type of non-bonded prestressed grouting uplift pile construction method, comprising the following steps:
[0046] S1: Calculate and design the diameter and depth of the pile hole 1 and excavate the pile hole 1 according to the design requirements;
[0047] S2: According to the hole depth of the pile hole 1 and the design requirements of the reinforcement cage 2, the reinforcement cage 2 is made in sections on the ground, and the reinforcement cage 2 is made by welding the ordinary reinforcement 20 and the spiral hoop 21, and the reinforcement cage 2. Put it into the pile hole 1, and weld the reinforcement cage 2 into a whole, and place the reinforcement cage 2 on the opening of the pile hole 1 with pole bars;
[0048] S3: installing a P-type extrusion anchor 32 at the bottom of the unbonded steel strand 33;
[0049] S4: Lift the unbonded steel strand 33 as a whole with the auxiliary hook of the crane and place it ...
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The invention relates to a novel construction method for a non-bonded prestressed pouring uplift pile. The method comprises the following steps that a common reinforcement cage is manufactured, and the common reinforcement cage is put into a hole to be welded into a whole; then a P-type extrusion anchor is installed at the bottom end of a non-bonded steel strand; then the non-bonded steel strand is integrally hoisted and placed over a hole opening through a crane auxiliary hook; the reinforcement cage is integrally hoisted through a main hook to penetrate through the non-bonded steel strand, and the non-bonded steel strand is sequentially and straightly bound to the reinforcement cage from bottom to top; then a steel casing is installed and filled to be compact; after the non-bonded steel strand is bound, the non-bonded steel strand and the reinforcement cage are integrally put into a pile hole, and finally concrete pouring and curing are conducted; after a foundation pit is excavated, a pile head is broken, and then the non-bonded steel strand is tensioned and locked; and finally, the steel casing is filled with high-strength grouting materials. The technical problems that in the construction process of the non-bonded prestressed pouring uplift pile, deformation of the reinforcement cage is likely to be caused, and the construction efficiency is low are solved.
Description
technical field [0001] The invention belongs to the construction field of building pile foundations, and in particular relates to a construction method of a novel unbonded prestressed grouting uplift pile. Background technique [0002] With the continuous development of construction technology, the common way to deal with cracks in reinforced concrete at this stage is to apply prestress to structural components, but it is common in long-span bridges, building floors and other parts. For the underground foundation of buildings, the application of prestress is not necessary. uncommon. [0003] In recent years, some domestic projects have applied prestressing to cast-in-place uplift piles, mainly including Beijing TV Center, Beijing Wangjing K6 and other projects. The prestressed uplift pile is to apply prestress to the pile body, which can ensure that the concrete of the pile body is still in a state of compression or slight tension under the action of buoyancy, thereby impro...
Claims
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IPC IPC(8): E02D5/38E02D5/58
CPCE02D5/38E02D5/58
Inventor 余地华汪浩赖国梁叶建陈国祁红伟田野柳瑶黄晓程
Owner CHINA CONSTR THIRD ENG BUREAU GRP CO LTD