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Method for repairing and treating quality defect of cast-in-place pile

A technology of quality defect and treatment method, which is applied in the direction of sheet pile wall, building, foundation structure engineering, etc., can solve the problems of unfavorable overall benefit and organizational management, failure to modify design, large amount of design modification, etc., and achieve low comprehensive cost, The effect of high construction requirements and low construction cost

Active Publication Date: 2015-06-17
浙江省岩土基础有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the amount of design modification is huge, which is not conducive to the overall benefit and organizational management of the project
In the event of a large-scale pile foundation accident, the design cannot be modified to meet the requirements
[0009] To sum up, the existing technical methods have different limitations in terms of safety, quality, cost input, construction period and application conditions.

Method used

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  • Method for repairing and treating quality defect of cast-in-place pile
  • Method for repairing and treating quality defect of cast-in-place pile
  • Method for repairing and treating quality defect of cast-in-place pile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The pile foundation of this embodiment is a broken part (such as Figure 1 to Figure 4 shown), the specific process is as follows:

[0059] 1) According to the defect position 1 and defect degree of each pile obtained from the low-strain measurement, as well as the situation of the project, determine the depth of drilling and coring of each defective pile, prepare the construction plan and draw the chart and report to the project department, The construction parameters will be issued to the construction team, and the technical disclosure will be made to the workers of the team.

[0060] 2) Use a drilling machine to drill a hole with a diameter ≥ 10cm on the pile top of the defective pile. When the diameter of the pile body is ≤ 80cm, place 1 hole in the center of the pile. There are two holes, and when the diameter of the pile body is ≥120cm, three or more holes are evenly distributed;

[0061] The coring depth exceeds the defect position, and the excess depth is 1-2 ...

Embodiment 2

[0074] Such as Figure 1 to Figure 4 Shown: the present embodiment pile foundation is a broken part.

[0075] Its specific technological process is as follows:

[0076] 1) According to the defect position 1 and defect degree of the pile obtained from the low-strain measurement,

[0077] 2) The diameter of the pile body is 1m. Use a drilling machine to drill two holes on the pile top of the defective pile, with a diameter of 11cm. In the same way, determine the defect location depth and defect degree again.

[0078] When drilling and coring the top of the pile, keep the drilling machine at a high level to ensure good verticality of the drilling.

[0079] 3) Lower the high-pressure rotary grouting drill pipe into the hole, use high-pressure water to spray and cut the defect position 1 times back and forth, cut and wash, and remove the concrete debris and a small amount of mud filling at the defect position. Until the mud block and fine sand filling in defect position 1 are r...

Embodiment 3

[0090] Such as Figure 5 to Figure 8 As shown: the pile foundation of this embodiment has two defective parts, and the specific method steps of the remedial treatment when the two defective parts are basically the same as that of embodiment 2, but because there are two defective parts, so the specific operation has its special place :

[0091] 1) According to the low-strain measurement, the upper and lower defect positions 1, 1' and the degree of defect of the pile, as well as the situation of this project, determine the depth of drilling and coring of the defect pile 。

[0092] 2) When the diameter of the pile body is 80cm, use a drilling machine to drill a hole with a diameter of 11cm in the center of the pile top of the defective pile, drill the core to a defect position below the pile body 1' below, and the depth beyond the pile is 1.5 times the body diameter;

[0093] When drilling and coring the top of the pile, keep the drilling machine at a high level to ensure good...

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Abstract

The invention discloses a remedial treatment method for cast-in-situ pile quality defects, which is characterized in that it comprises the following steps: 1) measuring and measuring the defect position of the pile with low strain; The excess depth is 1-2 times the diameter of the pile body; 3) High-pressure hole cleaning to remove mud, fine sand and other fillings in the defect position; 4) High-pressure hole cleaning to return the sediment in the core hole to the outside of the core hole, Make no sediment in the core hole until the water clears the slag; 5) High-pressure cement slurry punching and grouting: fill small cracks and cracks in the defect position; 6) Insert the tube, insert the grouting pipe and the grouting pipe; 7) Seal the hole ; 8) High-pressure grouting, filling the core hole with good cement slurry. After the remedial treatment of the defective piles, the low-strain dynamic testing and re-testing can all be repaired up to the standard. The method of the invention is simple and easy to implement, the construction period for remedial treatment of quality defects of cast-in-place piles is short, the remedial construction cost is low, the original engineering design is less changed, and the pile quality after remediation is reliable.

Description

technical field [0001] The invention relates to the technical field of pile foundations of construction engineering, in particular to a remedial treatment method for quality defects such as cracks, segregation, mud inclusion, broken piles and other quality defects of cast-in-situ piles. Background technique [0002] The pile foundation is the infrastructure of the building, and the solidity of the pile foundation project is the basic guarantee for the stability of the building for a century. Therefore, during construction, the cast-in-place piles must be up to standard. However, the quality defects of cast-in-situ piles will inevitably occur in construction, so how to take reasonable remedial measures for the quality defects of cast-in-situ piles, and how to make cast-in-situ piles with defective quality can reach the standard quickly, simply and economically has become a pile Research topics for basic engineering and technical personnel. [0003] At present, the commonly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/64
Inventor 丁旭亭汪拾金王进明虞利军严一华王建方王丽斌
Owner 浙江省岩土基础有限公司
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