CN110777860A

CN110777860A - Method for grouting and plugging back of side wall leakage water of subway station

Info

Publication number: CN110777860A
Application number: CN201911063687.2A
Authority: CN
Inventors: 邓长飞; 乔国强; 刘创印; 王栋
Original assignee: China Railway 12th Bureau Group Co Ltd; Second Engineering Co Ltd of China Railway 12th Bureau Group Co Ltd
Current assignee: China Railway 12th Bureau Group Co Ltd; Second Engineering Co Ltd of China Railway 12th Bureau Group Co Ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-02-11

Abstract

The invention relates to the technical field of subway maintenance, in particular to a method for plugging water leakage on a side wall of a subway station by back grouting. Including drilling, installation slip casting tube head, drainage pressure release, slip casting pipe shutoff, the side wall outside is equipped with waterproofing membrane, and the waterproofing membrane outside is equipped with envelope, puts at the central point of side wall seepage and adopts the water drilling puncher drilling, and the hole depth extremely envelope surface, downthehole installation slip casting pipe and carry out the drainage pressure release of a period of time, treat that intraductal rivers diminish after connect the slip casting pipe and pour into cement and the mixed thick liquid of water glass, fill the gap between waterproofing membrane and envelope, block groundwater seepage flow passageway, reach the effect from the shutoff behind one's back. The invention has good leakage water plugging effect and high speed, fundamentally solves the difficult problem of repeated leakage treatment of the side wall of the station, and provides more reliable quality assurance for later station operation. The invention is mainly applied to the aspect of sealing the leakage water of the side wall of the subway.

Description

Method for grouting and plugging back of side wall leakage water of subway station

Technical Field

The invention relates to the technical field of subway maintenance, in particular to a method for plugging water leakage on a side wall of a subway station by back grouting.

Background

Urban subway generally has the characteristics that the design burial depth is big, service life is long as alleviating the important carrier of ground traffic pressure, because side wall waterproofing membrane and concrete self defect in the work progress often lead to the different degree leakage water phenomenon to appear in the side wall, influence structure service function, cause the potential safety hazard to later stage station operation, the leaking stoppage method commonly used at present: the concrete crack surface is grooved, and the plugging mode of injecting epoxy resin into the grouting needle head is buried, and the method has the following problems: firstly, the leakage stopping mode is not thorough, the leakage problem cannot be solved fundamentally, and the repeated leakage condition is easy to occur; secondly, the repeated leakage needs to be treated repeatedly, the period is long, and the cost is high; thirdly, the surface of the concrete is only plugged, so that the internal leakage of the concrete cannot be well solved, the structural steel bars are easy to rust along with the passage of time, and the structural quality cannot be guaranteed; therefore, a more efficient and rapid plugging method which can treat both symptoms and root causes is needed.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides the method for grouting and plugging the back of the side wall leakage water of the subway station.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a method for plugging the back of the side wall of a subway station by grouting water comprises the following steps:

a. selecting the central position of the side wall permeated with water for drilling, wherein the drilling depth is up to the surface of the enclosure structure;

b. installing a grouting pipe in the hole;

c. turning threads on the exposed part of the grouting pipe, connecting a tee joint, connecting ball valves on two sides of the tee joint, and connecting a slurry pipe outside the ball valves;

d. after the grouting pipe is installed, opening the ball valve to drain water, and draining accumulated water in a gap between the waterproof coiled material and the enclosure structure;

e. after accumulated water is drained completely, grouting is carried out, cement paste is injected firstly, and after a certain amount of cement paste is filled in the gap, cement paste and water glass are injected simultaneously;

f. and after grouting is finished, plugging the grouting pipe.

In the step a, the position of the side wall reinforcing steel bar is determined by adopting a radar scanner before drilling, so that the side wall stressed reinforcing steel bar is prevented from being cut off during drilling.

And the grouting pipe in the step b is a grouting pipe with the diameter of 40 mm.

And e, controlling the grouting pressure of the cement paste in the step e to be 0.3MPa to 1MPa, and controlling the grouting pressure of the water glass to be 0.5 MPa to 1.5 MPa.

Compared with the prior art, the invention has the beneficial effects that:

the radar scanner location has guaranteed the accuracy nature of drilling, has improved drainage and slip casting effect, utilizes the tee bend, carries out drainage and slip casting through two pipelines, makes construction speed accelerate, fundamentally high-efficient, the quick difficult problem of solving the side wall percolating water.

Drawings

FIG. 1 is a schematic view of the construction of the present invention;

FIG. 2 is a flow chart of the construction process of the present invention;

in the figure: 1 is a side wall, 2 is an enclosure structure, 3 is a waterproof coiled material, 4 is a grouting pipe, 401 is a tee joint, 402 is a ball valve, 403 is a slurry pipe, and 5 is a gap.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 and 2, a method for plugging the back of a side wall of a subway station by grouting water comprises the following steps:

a. selecting the central position of the side wall 1 for water penetration to drill a hole, wherein the hole diameter is 42mm, the drilling depth reaches the surface of the enclosure structure 2, so that grouting materials are diffused towards the periphery by taking the grouting pipe 4 as the center, and if the area of leaked water is large, hole repairing can be considered;

b. installing a grouting pipe 4 in the hole, wherein the grouting pipe 4 is 500mm into the side wall, and if the wall is smaller in thickness, the grouting pipe is arranged outside the side wall 1;

c. the exposed part of the outer wall of the grouting pipe 4 is threaded and is used for connecting a tee joint 6, two sides of the tee joint 6 are connected with ball valves 7, and the outer sides of the ball valves 7 are connected with a slurry pipe 8;

d. after the grouting pipe 4 is installed, the ball valve 7 is opened to drain water, accumulated water in a gap 5 between the waterproof coiled material 3 and the enclosure structure 2 is drained, usually for 5-8 hours, and subsequent grouting work is facilitated to be smoothly carried out;

e. after accumulated water is drained completely, grouting is carried out, cement slurry is injected firstly, after a certain amount of cement slurry is filled in the gap 5, the cement slurry and water glass are injected simultaneously through the slurry pipes 8 on two sides of the tee joint 6, the water-cement ratio of the cement slurry is 0.8:1, the cement is ordinary silica 32.5 portland cement, and the water glass is a water solution of sodium silicate;

f. and after grouting, plugging the grouting pipe 4, firstly screwing off the tee joint 6 of the grouting pipe, cutting the exposed part of the grouting pipe 4 flat along the surface of the side wall 1 by using a grinding wheel machine, chiseling off the slurry condensed in the pipe, and then fully filling the grouting pipe 4 with micro-expansion fine stone concrete with a grade higher than that of the side wall 1.

Preferably, in the step a, the position of the side wall reinforcing steel bar is determined by a radar scanner before drilling, so that the side wall stressed reinforcing steel bar is prevented from being cut off during drilling.

Preferably, the grouting pipe in the step b is a grouting pipe with the diameter of 40 mm.

Preferably, the grouting pressure of the cement paste in the step e is controlled to be 0.3MPa to 1MPa, and the grouting pressure of the water glass is controlled to be 0.5 MPa to 1.5 MPa.

Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.

Claims

1. A method for grouting and plugging the back of a side wall of a subway station after water leakage is characterized by comprising the following steps:

selecting the central position of the side wall permeated with water for drilling, wherein the drilling depth is up to the surface of the enclosure structure;

installing a grouting pipe in the hole;

turning threads on the exposed part of the grouting pipe, connecting a tee joint, connecting ball valves on two sides of the tee joint, and connecting a slurry pipe outside the ball valves;

after the grouting pipe is installed, opening the ball valve to drain water, and draining accumulated water in a gap between the waterproof coiled material and the enclosure structure;

after accumulated water is drained completely, grouting is carried out, cement paste is injected firstly, and after a certain amount of cement paste is filled in the gap, cement paste and water glass are injected simultaneously;

and after grouting is finished, plugging the grouting pipe.

2. The method for plugging the side wall of the subway station by grouting water on the back of the subway station as claimed in claim 1, wherein: in the step a, the position of the side wall reinforcing steel bar is determined by adopting a radar scanner before drilling, so that the side wall stressed reinforcing steel bar is prevented from being cut off during drilling.

3. The method for plugging the side wall of the subway station by grouting water on the back of the subway station as claimed in claim 1, wherein: and the grouting pipe in the step b is a grouting pipe with the diameter of 40 mm.

4. The method for plugging the side wall of the subway station by grouting water on the back of the subway station as claimed in claim 1, wherein: and e, controlling the grouting pressure of the cement paste in the step e to be 0.3MPa to 1MPa, and controlling the grouting pressure of the water glass to be 0.5 MPa to 1.5 MPa.