Construction method of reinforcing broken stump by using prestress steel twist-beam replacement grouting method
A technology of prestressed steel and construction method, applied in sheet pile wall, foundation structure engineering, construction and other directions, can solve the problems of insufficient bearing capacity and low concrete strength, and achieve the effect of enhancing strength
Active Publication Date: 2013-11-13
CHANGJIAN CONSTR GRP
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to provide a construction method for reinforcing sick piles by replacing grouting with prestressed steel strands, which can solve the problem of insufficient bearing capacity caused by low concrete strength of large-diameter pile cores
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Embodiment Construction
[0013] The present invention is described in detail below, and its invention construction step is as follows:
[0014] a) drilling
[0015] Pay attention to the requirements of verticality when drilling holes. The verticality of drilling holes should be controlled within 0.8% to avoid drilling holes that deviate from the pile body, causing string holes and causing damage to the pile body.
[0016] b) clear holes
[0017] Use a flower tube to flush the sediment at the bottom of the pile. The flushing pressure is controlled at 1.5-3 MPa, and the punching is stopped after returning to clean water.
[0018] c) Embed anchors and steel strands at the bottom of the hole.
[0019] The anchorage adopts conical anchorage and is closed with 50cm high-strength cement slurry. After the strength of the high-strength cement slurry reaches 100%, perform prestressed tensioning. As shown in the figure, the exposed length of steel strand 1 is not less than 400mm to meet the tensioning require...
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Abstract
The invention discloses a construction method of reinforcing broken stump by using prestress Steel twist-beam replacement grouting method, includes using stiffness steel twist-beam to replace incompact concrete, strength loss caused by compensating concrete defect of stump, and using high-pressure groutig method to form the steel twist-beam and the stump body into a whole, the construction steps including: a) drilliing, b) cleaning holes, c) bottom of the holes is provided with anchorage and steel twist-beam, d) prestress strengthing, e) grouting and sealing. Because in the invention provided broken stump reinforcing method, using stiffness steel twist-beam to replace incompact concrete, strength loss caused by compensating concrete defect of stump, and using high-pressure groutig method to form the steel twist-beam and the stump body into a whole, so the broken stump can be integrated into a whole for improving its intensity.
Description
technical field [0001] The invention relates to a construction method for reinforcing sick piles by replacing grouting with prestressed steel strands. Background technique [0002] The large-diameter pile concrete will cause holes, serious segregation and other undesirable phenomena due to improper construction. The concrete strength of the pile core of this kind of sick pile is very low, which leads to insufficient compressive strength of the concrete, so that the bearing capacity is greatly reduced. And this kind of pile plays a greater role in bearing, generally one pile and one pile or two piles and one pile, etc. It is difficult to deal with this kind of situation after quality defects occur. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a construction method for reinforcing sick piles by replacing grouting with prestressed steel strands, which can solve the problem of insufficient bearing capacity caused...
Claims
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IPC IPC(8): E02D5/64E02D5/58E02D5/34
Inventor 朱奎叶长青
Owner CHANGJIAN CONSTR GRP