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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., to achieve the effect of low comprehensive cost, less process and low construction cost

Active Publication Date: 2014-01-29
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

[0010] 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

[0059] The pile foundation of this embodiment is a broken part (such as Figure 1 to Figure 4 shown), the specific process is as follows:

[0060] 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.

[0061] 2) Use a drilling machine to drill a hole ≥ 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. Two, when the diameter of the pile body is ≥120cm, three or more holes are evenly distributed;

[0062] The coring depth exceeds the defect position, and the excess depth is 1-2 times the diameter of the pile body;...

Embodiment 2

[0075] Such as Figure 1 to Figure 4 Shown: the present embodiment pile foundation is a broken part.

[0076] Its specific technological process is as follows:

[0077] 1) According to the defect position 1 and defect degree of the pile obtained from the low-strain measurement,

[0078] 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.

[0079] When drilling and coring the top of the pile, keep the drilling machine at a high level to ensure good verticality of the drilling.

[0080] 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, cut and rinse, and remove the filling materials such as concrete debris and a small amount of mud at the defect position. Until the filling materials such as mud block and fine sand in d...

Embodiment 3

[0091] 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 :

[0092] 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 。

[0093] 2) When the diameter of the pile body is 80cm, use a drilling machine to drill an 11cm hole 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 body is 1.5 times the diameter;

[0094] When drilling and coring the top of the pile, keep the drilling machine at a high level to ensure good verticality of th...

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Abstract

The invention discloses a method for repairing and treating a quality defect of a cast-in-place pile. The method is characterized by comprising the following steps that 1) the defect position of the pile is dynamically measured through low strain; 2) the top of the pile is drilled into for core taking, the depth of the core taking exceeds the defect position, and the exceeding depth is 1-2 times of the diameter of a pile body; 3) high-pressure hole flushing is carried out, and mud blocks, fine sand and other filler in the defect position are removed; 4) high-pressure hole cleaning is carried out, dregs in a core hole are returned out of a core hole opening, and no dreg sediment exists in the core hole until water is clear and the dregs are removed completely; 5) the hole is punched and filled with high-pressure cement slurry, and fine cracks and fissures of the defect position are filled with the cement slurry; 6) pipe insertion is carried out, and a grouting pipe and a slurry discharge pipe are inserted; 7) the hole is sealed; 8) high-pressure grouting is carried out, and the core hole is filled with the mixed cement slurry. Dynamic testing and retesting can both be restored and reach the standard through the low strain after the defected pile is repaired and treated. The method is simple and easy to implement, the working period for repairing and treating the quality defect of the cast-in-place pile is short, repairing construction cost is low, original project design is changed slightly, and the repaired pile is reliable in quality.

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 Applications(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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