Anchoring slurry material of prestressed anchoring cable of large cross-section tunnel of high-speed rail

A technology of prestressed anchor cables and high-speed railways. It is applied in the installation of anchor rods, mining equipment, earthwork drilling and mining, etc. It can solve the problems that cannot meet the construction requirements and achieve good workability, high early strength and moderate consistency.

Active Publication Date: 2018-06-08
THE 4TH ENG OF CHINA RAILWAY 5TH ENG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention: Aiming at the problem that the existing Portland cement and sulphoaluminate cement grouting m

Method used

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  • Anchoring slurry material of prestressed anchoring cable of large cross-section tunnel of high-speed rail
  • Anchoring slurry material of prestressed anchoring cable of large cross-section tunnel of high-speed rail
  • Anchoring slurry material of prestressed anchoring cable of large cross-section tunnel of high-speed rail

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1

[0034] Take the following materials in terms of mass percentage: 99.50% sulphoaluminate cement, 0.12% polycarboxylate water-reducing agent powder, 0.10% boric acid, 0.15% citric acid, 0.05% air-entraining agent, 0.08% lignin fiber, after mixing evenly , Use 0.30 water-binder ratio to formulate grouting material.

[0035] Using the prestressed anchor cable in Example 1 to anchor the slurry material properties Table 3:

[0036]

[0037] The slurry in Example 1 remained in a good working state until 20 minutes after being discharged from the machine, lost its fluidity in about 35 minutes, and reached initial setting in 43 minutes. The slurry has no bleeding or sinking during the whole process. At present, it has been applied in the pre-stressed anchor cable grouting construction of the large-span transition section of the Badaling Great Wall Station of the Beijing-Zhangjiakou High-speed Railway. During the construction, it takes about 10-20 minutes from the slurry to...

Example Embodiment

[0038] Example 2:

[0039] Take the following materials in terms of mass percentage: 99.54% sulphoaluminate cement, 0.12% polycarboxylate water-reducing agent powder, 0.12% boric acid, 0.15% citric acid, 0.01% air-entraining agent, 0.06% lignin fiber, and mix well. The pre-stressed anchor cable grouting material was formulated with a water-binder ratio of 0.32.

[0040] Using the prestressed anchor cable in Example 2 to anchor the slurry material properties are as follows:

[0041]

[0042] The slurry in Example 2 remained in a good working state until 20 minutes after it was discharged from the machine, lost its fluidity at about 40 minutes, and reached initial setting in 41 minutes. The slurry has no bleeding or sinking during the whole process.

Example Embodiment

[0043] Example 3:

[0044] Take the following materials in terms of mass percentage: 99.42% sulphoaluminate cement, 0.16% polycarboxylate water-reducing agent powder, 0.18% boric acid, 0.10% citric acid, 0.08% air-entraining agent, 0.06% lignin fiber, and mix well. The pre-stressed anchor cable grouting material was formulated with a water-binder ratio of 0.28.

[0045] The properties of the anchoring slurry material using the prestressed anchor cable in Example 3 are as follows:

[0046]

[0047] The slurry in Example 3 remained in a good working state until 20 minutes after it was discharged from the machine, lost fluidity at about 34 minutes, and reached initial setting in 35 minutes. The slurry has no bleeding or sinking during the whole process.

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Abstract

The invention discloses an anchoring slurry material of a prestressed anchoring cable. The anchoring slurry material is prepared by compounding early-strength sulphoaluminate cement, a polycarboxylatesuperplasticizer, a retarder, an air entraining agent and a thickening stabilizing agent; the materials reach the optimal composition by research, and thus the grouting slurry, which is extremely high in mobility, low in viscosity, proper in consistence, free from segregation, free from bleeding, quick to cure, and high in early strength, can be prepared; the components in percentage by mass of solid are that 98-99.7% of sulphoaluminate cement, 0.05-0.3% of water reducing agent, 0.1-0.5% of retarder, 0-0.08% of air entraining agent, and 0.04-0.20% of thickening stabilizing agent. The anchoring slurry material is high in workability, and low in workability; the problems of pipe blocking and locking of a stirring machine are decreased; proper working time is provided for construction; the slurry can smoothly flow through a 20mm fine pipeline to be poured into a hole being beyond 30m in height.

Description

technical field [0001] The invention relates to a cement slurry material, in particular to a formula for grouting and anchoring slurry for prestressed anchor cables in large-section tunnels. Background technique [0002] Prestressed anchor cable is an anchoring structure used for soil excavation and slope stability. Because of its safety, effectiveness, and economical applicability, it is often used for anchoring slope soil in recent years. The construction process is mainly divided into four stages: Positioning drilling - anchor cable installation - anchor grouting - anchor tensioning, in these four stages, anchor grouting plays a vital role and is also the most technically difficult part of prestressed anchor cable construction. [0003] The maximum excavation section of the Beijing-Zhangjiakou High-speed Railway Badaling Underground Station Tunnel under construction is nearly 900m 2 , in which the maximum span of a single arch in the transition section is 32.7 meters, an...

Claims

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Application Information

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IPC IPC(8): C04B28/06E21D20/02
CPCC04B28/06C04B2111/70C04B2201/50C04B2201/52E21D20/021C04B2103/302C04B22/082C04B24/06C04B2103/304C04B2103/445
Inventor 李瑞青陈跃龙蒋思匡飞龙朱永清骆勇
Owner THE 4TH ENG OF CHINA RAILWAY 5TH ENG GROUP
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