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Three pipe double high pressure rotary jet sprouting reinforced construction method and its equipment

A technology of grouting reinforcement and construction method, which is applied in basic structure engineering, construction, sheet pile wall and other directions, can solve problems such as insufficient soil crushing energy, and achieve the effect of enhancing crushing effect and increasing injection energy.

Inactive Publication Date: 2007-04-11
SHANGHAI TUNNEL ENGINEERING CO. LTD.
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AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing triple-pipe rotary-jet grouting reinforcement construction method for insufficient soil crushing energy, and to provide a triple-pipe double-high-pressure rotary-jet grouting reinforcement construction method. The jet energy is large and the crushing effect on the soil is strong. It can form a large-diameter, large-depth reinforcement pile to meet the needs of large-depth underground space development.

Method used

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  • Three pipe double high pressure rotary jet sprouting reinforced construction method and its equipment
  • Three pipe double high pressure rotary jet sprouting reinforced construction method and its equipment
  • Three pipe double high pressure rotary jet sprouting reinforced construction method and its equipment

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0020] The maximum excavation depth of an ultra-deep foundation pit project reaches 41m. The maintenance system of the foundation pit is an underground diaphragm wall and reinforced concrete support. The thickness of the underground diaphragm wall is 1.2m and the depth reaches 65.5m. Considering that the joints of the underground diaphragm wall have high requirements for water stop, high-pressure jet grouting piles are constructed outside the joints of the underground diaphragm wall for water stop reinforcement. According to the design requirements, the maximum reinforcement depth reaches 50m, the diameter of the reinforcement pile body is greater than 1.8m, and the uniaxial unconfined compressive strength is not less than 1.2MPa. There are three situations: three piles, five piles and whole row arrangement, the row spacing of piles is 1.4m, and th...

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Abstract

The triple pipe double high pressure rotary jetting sprouting method for reinforcing construction includes jetting high pressure water flow coating compressed air via the upper nozzle and jetting high pressure cement slurry coating compressed air via the lower nozzle separately to twice cut the soil before the cement slurry and the stirred soil mix to form foundation reinforcing pile. The rotary jetting apparatus for the construction has both high pressure water nozzle and high pressure cement slurry nozzle for the first soil cutting and the second soil cutting separately. The present invention can form high pressure jet with great energy and powerful soil breaking effect, and can form large and deep reinforcing pile.

Description

technical field [0001] The invention relates to a foundation grouting reinforcement construction method, in particular to a triple pipe rotary jet grouting reinforcement construction method and equipment thereof, belonging to the field of construction engineering. Background technique [0002] High-pressure jet grouting is a construction technology that combines high-pressure water jet cutting technology and chemical grouting technology for building foundation reinforcement. The principle is to use drilling rigs and other equipment to place the injector with nozzles installed at the bottom of the grouting pipe at a predetermined depth in the soil layer, use high-pressure water flow and compressed air flow to chop the soft underground soil, and then inject cement slurry , so that it is mixed with chopped soil to form a reinforced pile. [0003] The above-mentioned construction techniques were first used by Japanese experts for foundation reinforcement and waterproof curtain ...

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Application Information

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IPC IPC(8): E02D5/46E02D15/00
Inventor 余暄平肖晓春朱卫杰王吉望郭亮蔡兴华
Owner SHANGHAI TUNNEL ENGINEERING CO. LTD.
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