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Induced grouting method

A technology of grouting and grouting holes, which is applied in the fields of soil protection, construction, and infrastructure engineering, etc., and can solve the problems that the grouting effect cannot meet expectations, and the grout in closed formations cannot be fully poured in.

Active Publication Date: 2020-09-04
GUANGXI ROAD & BRIDGE ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the high-pressure jet grouting technology and the static pressure grouting technology used in the existing formation grouting in the prior art cannot fully pour the grout into the closed formation, resulting in the problem that the grouting effect cannot reach the expectation , providing an induced grouting method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] For a large river-crossing bridge, the main pier adopts the main pier foundation form of a circular underground diaphragm wall (referred to as the ground connection wall) + pebble stratum grouting foundation. The main pier is located in the alluvial river terrace landform, the terrain is relatively flat and open, the ground elevation is 27.70-38.70m, the thickness of the soft plastic silty clay stratum is 2-15.1m (the elevation is 21.48-24.77m), the plastic silty clay stratum The layer thickness is 7.3~13.1m (the elevation is 11.48~14.79m), the pebble stratum is 13.7~19.8m thick (the elevation is -0.31~-3.02m), the thickness of the moderately weathered marl layer is 24.6~30.3m (the elevation is -27.62~ 32.52m), the elevation of the foundation pit bottom of the ground connection wall is -10.5~-5m.

[0043] The outer diameter of the ground connection wall is 60.0 meters, the thickness of the wall is 1.2 meters, and the height of the wall is 29.0m to 35m. After the constr...

Embodiment 2

[0056] Such as figure 1 with 4 As shown, a kind of inductive grouting method described in the present invention is different from Embodiment 1 in that the regular figure in this embodiment is a rhombus, that is, the four adjacent grouting holes 5 form a rhombus Distribution, the numbers of the four grouting holes 5 in each rhombus include at least one ①, at least one ② and at least one ③, and the grouting holes 5 of all numbers ① in the pouring area are still poured first, Refill all the grouting holes 5 numbered ②, and finally pour all the grouting holes 5 numbered ③.

Embodiment 3

[0058] Such as figure 1 , 5 As shown in and 6, a kind of inductive grouting method described in the present invention differs from Embodiment 1 in that in this embodiment, the dividing line of the grouting plane is a circle, and the outer area is Figure 5 Middle A area, the central area is Figure 5 In the middle G area, the outer area is poured first, and then the central area is poured; when pouring, all the grouting holes 5 with the number ① in the poured area are poured first, and then all the grouting holes 5 with the number ② are poured, and finally poured The grouting holes 5 of all numbers ③.

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Abstract

The invention discloses an induced grouting method. A pumping well is utilized to cooperate with all grouting holes, the pumping well extracts groundwater to relieve pressure on a closed pebble stratum, the grouting holes grout on the closed pebble stratum at the same time, and the pressure in the closed pebble stratum is reduced to allow the slurry to be smoothly poured and diffused, so as to reach a design filling standard; through the division of grouting areas, the grouting is successively injected from the outer area to the central area, and the groundwater around the closed pebble stratum is gradually driven to the pumping well for pumping; the grouting holes of each grouting area are grouted in batches according to the number of the holes, grouting is carried out from the outer areato the central area successively at the same time to reduce the influence between adjacent grouting holes, and the reinforced soil to be grouted is gradually encryption grouted to avoid changes in the pressure of the reinforced soil to be grouted after concentrated grouting in a certain area, resulting in affecting the subsequent grouting of the un-grouted area and causing unbalanced grouting ofthe reinforced soil to be grout, thereby ensuring the quality of grouting.

Description

technical field [0001] The invention relates to the field of building construction, in particular to an induced grouting method. Background technique [0002] Ground grouting is used for foundation reinforcement or dam reinforcement in house construction and bridge construction in weak ground areas; according to years of construction experience and actual engineering results, the ground reinforcement process has a significant effect on improving the bearing capacity of the foundation and improving the deformation performance of the foundation effect, so it is widely used. [0003] The existing stratum grouting mainly adopts high-pressure jet grouting technology or static pressure grouting technology; high-pressure jet grouting technology uses the principle of high-pressure water jet cutting, which can make loose soil particles fall off and allow the soil to blend with the grout, thereby consolidating the building The static pressure grouting technology uses the principle of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12E02D15/02E02D19/10
CPCE02D3/12E02D15/02E02D19/10E02D2250/003
Inventor 罗小斌杜海龙韩玉秦大燕吴刚刚魏华廖汝锋杨茗钦王彬鹏陈召桃梁雨张振梅国雄
Owner GUANGXI ROAD & BRIDGE ENG GRP CO LTD