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Pored-tube filling and high-pressure impacting extruding grouting method

A high-pressure, hole-pipe technology, applied in the field of high-pressure punching "grouting," hole-pipe sealing, can solve the problems of low strength, poor grouting, poor effect, etc., and achieve the effect of high strength and good durability

Active Publication Date: 2012-07-04
POWERCHINA ZHONGNAN ENG
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  • Application Information

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Problems solved by technology

Because the rock masses in the structural extrusion fracture zone are mostly clastic structures, fine pores, low strength, and poor groutability, the effect of conventional cement grouting is poor, while chemical grouting materials are environmentally friendly, cost-effective, and structurally durable. Many problems, such as process complexity, have a certain impact on popularization and application

Method used

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  • Pored-tube filling and high-pressure impacting extruding grouting method

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Embodiment Construction

[0032] A method of grouting with the above-mentioned "hole tube sealing and high pressure squeezing", the specific steps are:

[0033] (1) Drilling and grouting lifting adopt full hydraulic power head drilling rig; squeeze grouting should adopt special high-pressure (≥10MPa) single-cylinder single-acting grouting pump, or use the current domestic three-cylinder high-pressure grouting pump to retain a plunger (unloading Go to two plungers) to realize single-cylinder single-action squeezing grouting, the appropriate amount of single squeezing is 0.3-1L, and the squeezing frequency is 30 times / min--100 times / min.

[0034] (2) The drilling segment is determined according to the stability of the hole wall and the capacity of the equipment and machinery. The length of a grouting segment is taken as a grouting segment with a full hole once or every 10m-50m from top to bottom. The grouting hole diameter adopts Φ75mm or Φ91mm. After the grouting section is drilled, flush the hole in the ho...

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Abstract

The invention discloses a pored-tube filling and high-pressure impacting extruding grouting method. The grouting method is mainly suitable for performing the reinforcing and impermeable grouting treatment on poor geologic bodies, such as broken and soft geologic bodies. The grouting method comprises the following steps: before grouting, utilizing a quick curing material to fill a clearance between a grouted pore section and a grouted tube set; forming a three-dimensional sealing structure by a sealing body of the grouted section and a one-way high-pressure impacting extruding grouting head at the lower end of the grouted tube set; performing the in-situ high-pressure impacting extruding rotary lifting grouting from bottom to top in the grouted pore section; controlling a grouting process according to a unit grouting quantity Q(L / m) and a grouting impacting extruding pressure P(MPa); and analyzing a grouting effect according to a sequencing change value of a quantity-to- pressure ratio I (I=Q / P). According to the grouting method provided by the invention, the effective and uniform high-pressure impacting extruding, splitting and permeable grouting are performed on a grouted stratum, and the grouted structural body is high in strength, is excellent in durability and is economical and environment-friendly.

Description

Technical field [0001] The invention relates to the field of foundation reinforcement and anti-seepage treatment grouting, in particular to a method of "hole pipe sealing and high-pressure squeezing" grouting, which is mainly suitable for foundation reinforcement and anti-seepage grouting treatment of broken, soft and other bad geological bodies . Background technique [0002] The dam foundation of the Xiangjiaba Hydropower Station under construction in my country has unfavorable geological bodies such as structural compression fracture zones, which are related to the stress, deformation and seepage stability of the dam foundation, and are key technical issues for the Xiangjiaba Hydropower Station project. At present, my country mostly uses "conventional cement grouting" and "chemical grout grouting" for the treatment of structural squeezing fracture zone. Because the rock masses in the structural compression fracture zone are mostly clastic structure, fine pores, low strength, ...

Claims

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Application Information

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IPC IPC(8): E02D15/04E02D3/12
Inventor 陈安重周运东卢贤伟刘晓丰舒王强刘良平胡大可詹前波潘江洋曾祥喜
Owner POWERCHINA ZHONGNAN ENG
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