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Construction Method of Dynamic Water Grouting and Solidification in Dense Sand Egg Layer

A sand egg and grouting technology, which is applied in basic structure engineering, excavation, construction, etc., can solve the problems of large groove resistance, large material consumption, easy collapse of groove walls, etc., and achieves low drilling resistance and simple construction operation. , the effect of low technical requirements

Active Publication Date: 2017-05-10
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP OF THE FIFTH ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the excavation of deep foundation pits, the pressurized water exerts hydrodynamic pressure on the bottom of the foundation pit, which is a hidden danger of surge in the bottom of the foundation pit and threatens the overall safety and stability of the foundation pit.
Due to the good porosity, high strength, high water-richness, and strong permeability of the sand egg layer, the general water-stop curtain cannot effectively reduce the dynamic and hydraulic connections inside and outside the foundation pit.
Simply adopting the curtain water-stop method of the underground diaphragm wall has the disadvantages of deep insertion depth and large amount of materials; in the high-strength dense sand egg layer, the resistance to forming grooves is large, the footage is slow, and the construction period cannot be guaranteed; The lower tank wall is easy to collapse, and the construction quality cannot be guaranteed. In the case of large-diameter round gravel, even serious consumption of machinery and tools is not possible, and it is impossible to implement at all.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The present invention proposes a compact sand egg layer dynamic water grouting solidification construction method, comprising the following steps:

[0039] 1) The drilling rig is in place and drilled to form a hole to form a grouting hole;

[0040] 2) Prepare the grouting pipe and bury the grouting pipe in the grouting hole;

[0041] 3) Grouting and sealing, grouting by infiltration grouting, and sealing the grouting holes;

[0042] 4) Curtain grouting: grouting all the grouting holes provided by the curtain to form the final curtain;

[0043] 5) Water pressure test to detect the impermeability of the cured final curtain.

Embodiment 2

[0045] This embodiment is further optimized on the basis of the above-described embodiments, and further to better realize the present invention, said step 1) includes the following process steps:

[0046] 1.1) Drilling machine in place: Install the drilling machine at the corresponding position, and the base of the drilling machine is installed firmly and horizontally. The drilling tool is aligned with the center of the hole. The drilling tool, the turntable, and the center of the hole should form a three-point line. The drilling machine is preferably XY-1B type. Rotary core drilling rig, and the composite steel drill bit is used for drilling construction during construction;

[0047] 1.2) Drilling and forming holes: The mud positive circulation drilling method is adopted. When drilling, the high-pressure mud passes through the hollow drill pipe of the drilling rig and shoots out from the bottom of the drill pipe; Drilling slag overflows to the mud chute outside the well as t...

Embodiment 3

[0074] This embodiment is further optimized on the basis of the above-mentioned embodiment, further to better realize the present invention, in order to strengthen the quality control of mud, adopt high-quality mud, the mud positive circulation drilling mode in the described step 1.2) is used The mud is made in the mud preparation before drilling, and the mud made meets the following indicators: specific gravity 1.2-1.4, viscosity ≥ 20s, sand content ≤ 4%, colloid rate ≥ 95%, plasticity index > 17. pH value > 6.5. Table 1 shows the mud technical indicators.

[0075] serial number project index Remark 1 proportion 1.2～1.4 Hole bottom is 1.4~1.6 2 viscosity ≮20s 3 Sand content ≯4％

[0076] 4 Colloid rate ≮95％ 5 plasticity index >17 6 PH value >6.5

[0077] Table 1

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Abstract

The invention discloses a compact sandy-pebble layer dynamic grouting curing construction method and an application layer structure. The method includes the following steps that (1) a drill machine is put in place and performs hole drilling and forming to form a grouting hole; (2) a grouting pipe is prepared and buried in the grouting hole; (3) grouting and hole sealing are performed, specifically, a permeating grouting mode is adopted for grouting, and the grouting hole is sealed; (4) curtain grouting is conducted, that is, all grouting holes in a curtain are grouted to form a finally curtain; (5) a pump-in test is performed, and the anti-permeability of the cured final curtain is detected. The compact sandy-pebble layer dynamic grouting curing construction method is applicable to foundation ditch waterproof curtain construction under the hydrogeological condition with a compact sandy-pebble layer rich in flowing underground water; high strength of the compact sandy-pebble layer is avoided by means of permeating grouting; grout is good in anti-permeability after being cured after a certain time; accordingly, hydraulic connection of inside and outside of a foundation ditch is reduced, and a manual waterproof barrier is formed.

Description

technical field [0001] The invention relates to the technical field of pouring construction, in particular to a construction method of dynamic water grouting and solidification of a dense sand egg layer. Background technique [0002] In the dense sand egg layer rich in high-head confined water, the confined water in the sand egg layer is in a flowing state in a natural state. During the excavation of deep foundation pits, the pressurized water exerts hydrodynamic pressure on the bottom of the foundation pit, which is a hidden danger of surge in the bottom of the foundation pit and threatens the overall safety and stability of the foundation pit. Due to the good porosity, high strength, high water-richness and strong permeability of the sand egg layer, the general water-stop curtain cannot effectively reduce the dynamic and hydraulic connection inside and outside the foundation pit. Simply adopting the curtain water-stop method of the underground diaphragm wall has the disad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/02E02D19/18
Inventor 苏春生
Owner CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP OF THE FIFTH ENG
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