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The Construction Method of Using Grouting Steel Pipe Pile to Strengthen Complicated Strata

A construction method and complex stratum technology, applied in the direction of sheet pile walls, soil protection, foundation structure engineering, etc., can solve the problems of hole collapse and slurry curing effect to be improved, so as to reduce hole collapse, avoid hole collapse, Avoid the effect of cave collapse

Active Publication Date: 2021-06-15
THE GUANGDONG NO 3 WATER CONSERVANCY & HYDRO ELECTRIC ENG BOARD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent application also adopts the method of installing the steel pipe first and then grouting, which is easy to cause hole collapse, and the curing effect of the slurry used in the grouting needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]A construction method using grouted steel pipe piles to reinforce complex strata, comprising the following steps:

[0045] (1) Tamp the site to ensure the site is flat and carry out measurement and positioning;

[0046] (2) Use a drilling machine to drill holes at the positioned position, and stop drilling when any of the two conditions of the hole depth exceeding 13m and reaching the rock surface are met to form pile holes with a diameter of 0.3m. The distance between pile holes is 0.5m;

[0047] (3) Using the grouting method at the bottom of the hole, insert the grouting pipe to the bottom of the pile hole and inject the grout, under the pressure of 0.6MPa at a rate of 47L / min to the half of the hole depth, and then under the pressure of 1MPa Grouting at a speed of 40L / min, when the pure slurry emerges from the hole of the pile, any one of the following two conditions is met to terminate the grouting: Condition 1, the amount of grouting on a dry basis reaches 2.5 tons...

Embodiment 2

[0053] A construction method using grouted steel pipe piles to reinforce complex strata, comprising the following steps:

[0054] (1) Tamp the site to ensure the site is flat and carry out measurement and positioning;

[0055] (2) Use a drilling machine to drill holes at the positioned position, and stop drilling when any of the two conditions of the hole depth exceeding 13m and reaching the rock surface are met to form pile holes with a diameter of 0.4m. The distance between pile holes is 1m;

[0056] (3) Using the grouting method at the bottom of the hole, insert the grouting pipe to the bottom of the pile hole and inject the grout. Under the pressure of 0.8MPa, the grouting rate is 40L / min to half the depth of the hole, and then under the pressure of 1.5MPa Grouting at a speed of 32L / min, when the pure slurry emerges from the hole of the pile, any one of the following two conditions is met to terminate the grouting: Condition 1, the amount of grouting on a dry basis reache...

Embodiment 3

[0062] A construction method using grouted steel pipe piles to reinforce complex strata, comprising the following steps:

[0063] (1) Tamp the site to ensure the site is flat and carry out measurement and positioning;

[0064] (2) Use a drilling machine to drill holes at the positioned position, and stop drilling when any of the two conditions of the hole depth exceeding 13m and reaching the rock surface are met to form pile holes with a diameter of 0.35m. The distance between pile holes is 0.75m;

[0065] (3) Using the grouting method at the bottom of the hole, insert the grouting pipe to the bottom of the pile hole and inject the grout. Under the pressure of 0.7MPa, the grouting rate is 43L / min to half the depth of the hole, and then under the pressure of 1.2MPa Grouting at a speed of 36L / min, when the pure slurry emerges from the hole of the pile, any one of the following two conditions is met to terminate the grouting: Condition 1, the amount of grouting on a dry basis re...

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Abstract

The invention relates to the technical field of construction engineering, in particular to a construction method for reinforcing complex strata by using grouted steel pipe piles. The method comprises the following steps: (1) compacting the site to ensure that the site is level, and performing measurement and positioning; (2) The position to be positioned is drilled with a drilling machine to form a pile hole; (3) The grouting pipe is inserted to the bottom of the pile hole and the slurry is injected until the pure slurry emerges from the pile hole by using the grouting method at the bottom of the hole. out, terminate the grouting; (4) install the steel pipe at the pile hole position. The invention has the advantages of short curing time and excellent mechanical properties.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a construction method for reinforcing complex strata by using grouted steel pipe piles. Background technique [0002] Karst caves are underground spaces formed by karst action in soluble rocks. The formation of caves is the result of long-term dissolution of groundwater in limestone areas. The surface water dissolves along the joint surface or fissure surface in the limestone, forming a karst (or trough), and the surface water seeps and erodes downward along the limestone cracks, forming a sinkhole when the depth exceeds 100 meters. The groundwater falling from the sinkhole flows laterally into the aquifer, forming a cave. With the formation of underground caves, the surface collapses. The depth of the collapse is large and the area is small, which is called the collapse funnel, and the small depth is called the sinking pond. The dissolution and subsidence of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/00E02D3/08E02D5/38C04B28/04C04B111/70
CPCC04B28/04C04B2111/70E02D3/00E02D3/08E02D5/38C04B22/002C04B18/08C04B14/08C04B24/123C04B24/06C04B24/10
Inventor 郭建功陈小惠杨俊峰肖芳腾杨志勇
Owner THE GUANGDONG NO 3 WATER CONSERVANCY & HYDRO ELECTRIC ENG BOARD CO LTD
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