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Pressure-maintaining circulating grouting method

A technology of grouting and grouting holes, which is applied in earthwork drilling, wellbore lining, tunnel lining, etc. It can solve problems such as difficulty in maintaining stable grouting pressure and small amount of grouting, achieve good reinforcement effect, avoid pollution, and save energy. material effect

Pending Publication Date: 2021-08-20
CHINA RAILWAY ENG CONSULTING GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following defects in this cyclical pressure-holding multi-round grouting method: (1), it is difficult to keep the grouting pressure stable during the grouting process; (2), it is not suitable for the situation where the amount of grout absorbed by the formation is small

Method used

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  • Pressure-maintaining circulating grouting method
  • Pressure-maintaining circulating grouting method
  • Pressure-maintaining circulating grouting method

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Embodiment Construction

[0036] Next, the pressure-holding cycle grouting method of the present invention will be described in detail with reference to the accompanying drawings.

[0037] First, if Figure 1A As shown, according to the purpose of grouting water blocking or reinforcement, taking tunnel 3 as an example, the drilling design of grouting hole 1 is carried out in the pre-construction area with reference to water blocking or reinforcement contour line 2, and the drilling distance of grouting hole 1 needs to be Considering factors such as the degree of fracture development, the hydraulic pressure of groundwater, the porosity of the soil, and the designed grouting pressure, the drilling depth mainly considers the range of pre-sealing or reinforcement. Next, if Figure 1B As shown, according to the designed drilling parameters of the grouting hole 1, accurate measurement and lofting are carried out. After the drilling rig 6 is in place, adjust the drill pipe 4 and the power head 5 to the design...

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Abstract

The invention discloses a pressure-maintaining circulating grouting method which comprises the following steps: (1) hole positions of a plurality of grouting holes are set and marked in a to-be-grouted area, and adjusting a drilling machine to a designed angle to drill to a designed depth. (2) hemp threads are wound on the outer portion of the steel sleeve, the steel sleeve is fixed at an orifice of the grouting hole, and then the steel sleeve is installed to the grouting depth in the grouting hole; (3) after the steel sleeve is solidified, a circulating backflow grouting plug is installed at the tail end of the steel sleeve, the circulating backflow grouting plug is lifted up through a pressurizing pump, and the opening of the grouting hole is blocked; (4) a grouting hose of a grouting system is connected with a grouting pipe connector of the annular backflow grouting plug, a grout return hose of the grouting system is connected with a grout return pipe connector of the annular backflow grouting plug, and grouting is conducted; and (5) when the grouting amount of the to-be-grouted hose is consistent with the backflow amount of the grout return hose, it is indicated that the stratum grout suction amount meets the design requirement, and grouting is stopped.

Description

technical field [0001] The invention relates to the technical field of grouting reinforcement control settlement in underground engineering, in particular to a grouting reinforcement method. Background technique [0002] At present, the grouting reinforcement methods generally adopt static pressure grouting and high-pressure grouting. These two grouting methods use grouting equipment to pressurize the grout, and penetrate or fill the grout into the formation cracks through the pressure, so as to protect the groundwater. Plugging, or grout filling into the formation to form a skeleton for reinforcement. This method is simple and effective in construction, and requires less operation. However, when the grout enters the formation, pressure will be formed. If the burial depth is shallow or the grouting area is sensitive to pressure, not only The effect of grouting is restricted, and it is easy to cause quality and safety accidents. [0003] In order to control the stability of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10
CPCE21D11/107
Inventor 吕刚刘方刘建友岳岭蒋小锐孙国庆吴昆朝张亮单红雨邹明波张继昶王剑韩冰田文伟
Owner CHINA RAILWAY ENG CONSULTING GRP CO LTD
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