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Repair method of unqualified post-grouting bored concrete pile

A technology of cast-in-situ pile and post-grouting, which is applied in the direction of sheet pile wall, building, foundation structure engineering, etc., can solve the problems of affecting the construction period and loss of economic benefits, so as to achieve no influence on the construction period, simple operation, safe and reliable project quality Effect

Active Publication Date: 2013-06-26
MCC5 GROUP CORP SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to various geological reasons or construction reasons, the grouting of a small amount of cast-in-place piles fails to meet the design requirements, and the designer needs to check whether the bearing capacity requirements are met. If not, the construction unit needs to formulate a special reinforcement plan and be approved by the design review. , or even re-forming holes and pouring, which will affect the construction period and cause serious economic loss
[0003] Therefore, the known measures to solve the grouting after the cast-in-situ piles fail to meet the design requirements have the above-mentioned inconveniences and problems, and have become a subject for the majority of building rock foundation engineering technicians to think about.

Method used

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  • Repair method of unqualified post-grouting bored concrete pile
  • Repair method of unqualified post-grouting bored concrete pile
  • Repair method of unqualified post-grouting bored concrete pile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Drill two pilot holes on the outside of the cast-in-situ pile body, and set up two post-grouting pipes for construction

[0047] The method for repairing the cast-in-situ grouting pile after failing to meet the standard of the present invention is characterized in that it comprises the following steps:

[0048] a. Drill some guide holes on the outside of the cast-in-place pile body

[0049] Schematic diagram of the grouting pipe layout on the outside of the cast-in-place pile; the pilot hole, the diameter of the pilot hole is 150mm, so that the edge of the pile body reaches 300mm from the center of the pilot hole.

[0050] b. Supplementary grouting pipes on the outside of the pile, including the following steps:

[0051] (1) Investigate and analyze that the grouting pipe buried inside the original pile body can continue to be grouted;

[0052] (2) Set two pilot holes symmetrically around the outside of the cast-in-place pile body, and set a post-grouting pipe in the m...

Embodiment 2

[0071] Drill four guide holes on the outside of the cast-in-situ pile body, and set up four post-grouting pipes for construction

[0072] The grouting pipe buried inside the original pile body can no longer be grouted. Four guide holes are symmetrically arranged outside the pile body of the cast-in-place pile, and a rear grouting pipe is arranged in the middle of the guide hole so that the depth of the rear grouting pipe is the same as that buried inside the original pile body. The grouting pipe is the same. The remaining steps of this embodiment are the same as in Embodiment 1.

[0073] The method for repairing cast-in-situ piles after grouting that fails to meet the standard of the present invention effectively solves the problem of how to deal with the situation that the grouting after the piles fails to meet the design requirements. Pile filling can not only guarantee the construction period, but also meet the economic benefits, and at the same time ensure the smooth impl...

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Abstract

A repair method of an unqualified post-grouting bored concrete pile is characterized by comprising the following steps: a, drilling a plurality of lead holes at the outer side of a bored concrete pile body; b, supplementing a post-grouting pipe at the outer side of the bored concrete pile; c, conducting post-grouting construction; and d, maintaining the bored concrete pile, and inspecting and accepting the bored concrete pile, wherein the posting-grouting construction includes the following steps: (1) providing raw materials of slurry, (2) preparing the slurry, (3) conducting preparation for grouting construction, (4) conducting the first round of grouting, (5) conducting the second round of grouting, and (6) controlling over stop of the grouting. The repair method of the unqualified post-grouting bored concrete pile has the advantages of being reasonable in design of construction steps, easy and convenient to operate, safe and reliable in construction quality, free from influencing the construction period, remarkable in economic benefit, and capable of guaranteeing that a project is implemented smoothly.

Description

technical field [0001] The invention relates to a method for repairing cast-in-place pile foundations, in particular to a repair method for grouted cast-in-situ piles which fail to meet standards. Background technique [0002] Post-grouting cast-in-place piles use the pre-buried grouting pipes at the bottom and sides of the steel cage to pressurize the grout into the concrete through the post-grouting devices installed on the side and bottom of the pile after the concrete pouring pile is formed. Pile side and pile bottom, through the seepage and expansion, splitting, filling, compaction and consolidation of grout, overcome the defects of traditional cast-in-place piles that affect the bearing capacity of cast-in-place piles due to the mud skin around the pile body and the thick sediment at the bottom of the pile, etc. Improve the pile-soil working interface, increase pile side friction resistance and pile end bearing capacity, thereby greatly increasing the ultimate bearing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/64
Inventor 尚宁洲
Owner MCC5 GROUP CORP SHANGHAI
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