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Method of grouting waterproof curtain in leakage treatment of rail transit underground platform

A technology for rail transit and waterproof curtains, applied in construction, infrastructure engineering, etc., can solve problems such as poor plugging effect, failure to meet safe use requirements, and difficulty in achieving it, so as to improve bearing capacity, control structural water leakage, Controlling the effect of settling

Inactive Publication Date: 2021-09-28
GUANGDONG TAISHI IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0044] For a long time, the underground platform of rail transit has used shallow chemical grouting on the back surface of the concrete structure to repair or seal the leakage. For areas with high water pressure and abundant groundwater, the plugging effect is poor, and it is difficult to meet the requirements of radically curing the leakage water from the system. Repeated water leakage and repeated repairs waste a lot of manpower and material resources, and the effect is very small. Ultra-fine cement chemical grouting materials have been used in engineering construction for many years.
In the past, the water glass on the market was directly used as the curing agent. Because the consolidated body is difficult to maintain stability for a long time, the consolidated body is easy to weather and disintegrate, which cannot meet the requirements for safe use, which directly affects the use of grouting behind the wall as a water-stop curtain , the current superfine cement generally adopts ordinary Portland cement, while slag Portland cement or pozzolan Portland cement is less effective

Method used

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  • Method of grouting waterproof curtain in leakage treatment of rail transit underground platform
  • Method of grouting waterproof curtain in leakage treatment of rail transit underground platform
  • Method of grouting waterproof curtain in leakage treatment of rail transit underground platform

Examples

Experimental program
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Effect test

example 1

[0115] Example 1 Determination of hole spacing and row spacing for silt grouting reinforcement, on-site drilling sampling confirmation analysis, permeability coefficient k is 4×10 -3 cm / sec, the porosity is 30-50% and n is 40%, the slurry viscosity α is 1.2 centipoise, the grouting hole Φ3.2-4.0cm is taken as r radius 2.0cm, the grouting pressure is 0.4-0.8MPa and h is 0.5MPa, That is, the water head is 5000cm, the time is 5-15 minutes, and t is 15 minutes, that is, 900 seconds. Calculate the slurry diffusion radius according to the Mag formula as follows:

[0116] R=((3krht / nα)+r 3 ) 1 / 3 =((3×4×10 -3 ×2×5000×900) / (0.4×1.2)+2 3 ) 1 / 3 = 60.82 cm.

[0117] (2) Layout of grouting holes

[0118] Grouting hole spacing and row spacing The grouting holes are distributed in a quincunx shape, and the tentative grouting hole spacing is 2.5m, which will be adjusted after trial grouting.

[0119] (3) The amount of grouting for grouting reinforcement in soft ground should be determ...

example 2

[0160] Example 2. Using the empirical method, the grouting penetration radius R = 1.500mm, the length of the grouting section h = 3.000mm, and the empirical coefficient 0.3;

[0161] Q=C 1 V

[0162] =1.5 2 ×3.14×3×0.3

[0163] 6.35m 3 .

[0164] The position, hole spacing, row spacing and depth of grouting holes for foundation reinforcement of existing buildings shall be determined according to on-site grouting tests, and dynamic construction shall be carried out during the grouting process, and monitoring shall be done during the construction process.

[0165] pulp preparation

[0166] The mixing position of ultra-fine cement slurry-modified water glass should be determined according to the initial setting time of the slurry. When the initial setting time is greater than 2 minutes, it should be mixed at the orifice; when the initial setting time is less than 2 minutes, it should be mixed in the hole or at the bottom of the hole.

[0167] (1) Dilution of modified water...

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Abstract

The invention discloses a method of a grouting waterproof curtain in leakage treatment of a rail transit underground platform. The leakage treatment of the rail transit underground platform is realized by adopting a superfine cement-modified water glass chemical grouting mode, wherein modified water glass takes a metal salt and an auxiliary agent as a modification material, the modulus of a water glass solution is 2.4-2.8, the concentration of the water glass solution is controlled in a range of 30-45Be', and the volume ratio of cement paste to the modified water glass solution is 1: 0.4-1: 0.6 when the modified water glass solution is 40Be'. According to the method of the grouting waterproof curtain in leakage treatment of the rail transit underground platform, core-pulling detection can be carried out on crack filling and compactness within a construction range; compactness detection can also be carried out by using ultrasonic waves; dynamic load grouting is feasible in technology, cracks do not appear on original reinforced portions of bridges, buildings or water leakage portions reinforced through grouting, water leakage does not occur any more, and the permanent bonding reinforcing effect is achieved from the structural level.

Description

technical field [0001] The invention relates to the technical field of engineering repairs, in particular to a method for treating the leakage of a grouting waterproof curtain in an underground rail transit platform. Background technique [0002] For a long time, the underground platform of rail transit has used shallow chemical grouting on the back surface of the concrete structure to repair or seal the leakage. For areas with high water pressure and abundant groundwater, the plugging effect is poor, and it is difficult to meet the requirements of radically curing the leakage water from the system. Repeated water leakage and repeated repairs waste a lot of manpower and material resources with little effect. [0003] Chemical Grouting is to prepare a certain chemical material (inorganic or organic material) into a real solution, and use chemical grouting pump and other pressure-feeding equipment to pour it into the formation or gap to make it penetrate, diffuse, gel or solid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D19/16C04B28/26C04B111/70C04B111/72C04B111/27
CPCE02D19/16C04B28/26C04B2111/70C04B2111/72C04B2111/27C04B7/02C04B18/08
Inventor 王春晓钟坤成邓思荣邓清泉邓景峰
Owner GUANGDONG TAISHI IND CO LTD
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