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Synchronous grouting method for recycling large-diameter waste slurry generated during slurry shield

A waste mud and mud-water shield technology, applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve problems such as poor flow in pipes, bulging and cracking of pipes, small amount of cement added, etc., and achieve good flow Effects of water retention and pumpability, reduced water consumption, and improved water retention

Active Publication Date: 2014-07-30
CHINA RAILWAY 14TH BUREAU GRP LARGE SHIELD ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, bentonite particles are dispersed in water to form a suspension, which has good slurry-making properties, but is expensive and used in large quantities, and the economic cost is high
The amount of cement added is small. If the amount is too much, it will easily cause the problem of short setting time and poor flow in the pipe. The uneven distribution of sand will easily cause stratification; the mud will easily absorb too much water and expand, causing the pipe to bulge and crack during transportation. , less secure

Method used

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  • Synchronous grouting method for recycling large-diameter waste slurry generated during slurry shield
  • Synchronous grouting method for recycling large-diameter waste slurry generated during slurry shield

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of each cubic meter product includes the following weight raw materials: cement 180kg, slaked lime 50kg, fly ash 265kg, sand 1300kg, waste mud 500kg, methyl cellulose 1kg, lignosulfonate 2kg, wood sodium 1.5kg, rosin thermal polymerization Object 0.5kg. The mud indexes of this embodiment are shown in Table 1.

[0018] Table 1

[0019]

[0020] This embodiment also has the following advantages: excellent wetting, uniform dispersion, good water retention effect, improved concrete workability, small slump, strong permeability resistance, high strength and compactness; large amount of air bubbles but small volume of individual air bubbles , so frost resistance and impermeability are strong.

Embodiment 2

[0022] Preparation of each cubic meter product includes the following weight raw materials: 100kg of cement, 95kg of slaked lime, 180kg of fly ash, 1500kg of sand, 570kg of waste mud, 0.5kg of hydroxypropyl methylcellulose, 1kg of casein, 2kg of sodium citrate, and alkylsulfonate Salt 1.5kg. The mud indexes of this embodiment are shown in Table 2.

[0023] Table 2

[0024] project standard consistency 120mm Water retention 85% density 2450kg / m 3 Liquidity 200mm pumpability it is good clotting time 28h25min Compressive strength (28d) 3.3MPa

[0025] This embodiment also has the following advantages: good water retention, uniform dispersion, good retarding effect, high pumpability, high hardness and high strength after coagulation, long coagulation time, tensile resistance, compression resistance and frost resistance; the introduction of air bubbles, but Strength is not affected.

Embodiment 3

[0027] Preparation of each cubic meter product includes the following weight raw materials: cement 160kg, slaked lime 70kg, fly ash 285kg, sand 1350kg, waste mud 530kg, mortar thickening powder 1.5kg, powder polycarboxylate 0.5kg, sodium pyrophosphate 1kg, fat Sodium alcohol sulfate 2kg. The mud indexes of this embodiment are shown in Table 3.

[0028] table 3

[0029] project standard consistency 130mm Water retention 85% density 2400kg / m 3 Liquidity 200mm pumpability it is good clotting time 22h58min Compressive strength (28d) 3.0MPa

[0030] This embodiment also has the following advantages: safe, non-toxic, non-radioactive and non-corrosive, good water resistance, high durability and bond strength, reduced water volume, high strength after condensation; abundant foam introduced during mixing, stable and long-lasting, non-toxic precipitation phenomenon.

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Abstract

The invention provides a synchronous grouting method for recycling large-diameter waste slurry generated during slurry shield. The product per cubic meter is prepared from the following raw materials by weight: 100-180kg of cement, 50-120kg of slaked lime, 120-350kg of fly ash, 1300-1500kg of sand, 500-800kg of waste slurry, 0.5-2kg of water-retaining thickener, 0.5-2kg of water reducer, 0.5-2kg of retarder and 0.5-2kg of air entraining agent. The method has the advantages that expensive bentonite is unnecessary to be added, and about 100kg of bentonite is saved by mortar per cubic meter, thus effectively reducing the cost; the method has the advantages of good pumpability, water-retaining property, lubricating property, flowability, filling property and the like, and is used for fully utilizing the waste slurry.

Description

technical field [0001] The invention relates to the field of mud-water shield waste mud, in particular to a large-diameter mud-water shield waste mud reuse synchronous grouting. Background technique [0002] A large amount of waste mud is produced in the mud-water shield process, and the waste mud is processed and injected back into the ground. During the construction of the tunnel, making full use of the waste mud is of great significance for reducing economic costs and reducing emissions and environmental protection. At present, bentonite particles are dispersed in water to form a suspension, which has good slurry-making properties, is expensive and uses a large amount, and the economic cost is high. The amount of cement added is small. If the amount is too much, it will easily cause the problem of short setting time and poor flow in the pipe. The uneven distribution of sand will easily cause stratification; the mud will easily absorb too much water and expand, causing the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/08C04B14/06C04B18/30
CPCY02W30/91
Inventor 徐兴居戴洪伟陈健王华伟孔玉清李东升
Owner CHINA RAILWAY 14TH BUREAU GRP LARGE SHIELD ENG CO LTD
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