Core-grouting reinforcing construction method for prestressed concrete pipe piles with post-grouting method

Abstract

The invention provides a core-grouting reinforcing construction method for prestressed concrete pipe piles with a post-grouting method. The method comprises the following construction steps: determining the depth of the defect position of a pile body, and then cleaning holes with compressed air or high-pressure water until the required hole cleaning depth; setting the number of steel strands or reinforcing bars according to the computing requirement, putting down the steel strands or the reinforcing bars to the computed core grouting length, exposing more than 2m out of a pile top for putting-down control or a bearing capacity test for the steel strands or the reinforcing bars, and then using a 6-8mm steel plate as the bottoming thickness; adopting two welded steel pipes as grouting pipes, namely a primary grouting pipe and a secondary grouting pipe; selecting powder-free gravel with the uniform grain sizes Phi being 10-20mm and the compressive strength larger than M30 as a gravel material, and backfilling the gravel material to orifices; before grouting, cleaning holes with pressed water for the primary grouting pipe until backwater is clean; then respectively carrying out primary grouting and secondary grouting. The method has the advantages of being convenient to operate, low in cost and high in construction speed, can improve the quality of the pile body and the bearing capacity of a single pile, and ensures the whole project quality.

Description

technical field [0001] The invention relates to the technical field of prestressed concrete pipe pile construction, in particular to a prestressed concrete pipe pile post-grouting method for core reinforcement construction. Background technique [0002] With the continuous development of the construction industry, prestressed concrete pipe piles are widely used. There are obvious or serious defects in the integrity of the pile body, insufficient bearing capacity of a single pile, poor working condition of the pile and other quality problems. The commonly used reinforcement methods for these quality problems are either too complicated and costly, or are limited by construction conditions, or the depth of reinforcement is limited. How to effectively and quickly achieve the required reinforcement effects to various degrees has not been a breakthrough. [0003] Therefore, it is necessary to involve a prestressed concrete pipe pile post-grouting method for core reinforcement con...

AI Technical Summary

Problems solved by technology

[0002] With the continuous development of the construction industry, prestressed concrete pipe piles are widely used. There are obvious or serious defects in the integrity of the pile body, insufficient bearing capacity of a single pile, poor working condition of the pile and other quality problems

The commonly used reinforcement methods for these quality problems are either too complicated and costly, or are limited by construction conditions, or the depth of reinforcement is limited. How to effectively and quickly achieve the required reinforcement effects to various degrees has not been a breakthrough.

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