Microorganism curing striking-in type steel pipe soil nail and construction method thereof

Abstract

The invention discloses a microorganism curing striking-in type steel pipe soil nail and a construction method thereof. The steel pipe soil nail mainly comprises a steel pipe and angle iron. The steelpipe comprises a pipe head and a pipe body. The construction method mainly includes the steps that the steel pipe soil nail is manufactured, and the steel pipe soil nail is struck into mud through apneumatic down-the-hole hammer; sporosarcina pasteurii is activated and subjected to enlarge cultivation, and a microorganism bacterium solution is obtained; the obtained microorganism bacterium solution is injected into the soil nail through the steel pipe soil nail so that the microorganism bacterium solution can be spread in sandy soil; a composite nutrient solution is prepared and includes 0.5mol / L of urea and 0.5 mol / L of calcium salt; the composite nutrient solution is injected into the steel pipe soil nail and a slope face, and an anchoring body is formed; and the above steps are repeated till the strength of the soil nail reaches the design requirement, and the microorganism curing striking-in type steel pipe soil nail is obtained. By means of the microorganism curing striking-intype steel pipe soil nail and the construction method thereof, the sandy soil in the soil nail is cemented through a cementing effect of microorganisms, the mechanical property of a slope soil body isimproved, the integrity and self stability of the slope soil body are improved, and the slope can be more stable.

Description

technical field [0001] The invention relates to the technical field of foundation pit support, in particular to a microbial solidification driven-in steel pipe soil nail and a construction method thereof. Background technique [0002] The foundation pit support is to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit, and the support, reinforcement and protection measures adopted for the side wall of the foundation pit and the surrounding environment. The foundation pit support methods mainly include row pile support, pile anchor, pile support, underground diaphragm wall, steel sheet pile, cement-soil retaining wall and soil nail wall, etc. In the form of soil nailing wall support, the driven-in grouting soil nail is suitable for the weak soil layer where it is difficult to form holes. [0003] During construction in areas rich in water and highly saturated with water, although precipitation measures have been t...

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Problems solved by technology

[0003] During construction in areas rich in water and highly saturated with water, although precipitation measures have been taken, some free water will still seep from the slope after excavation. If this part is not treated properly, a large number of particles may be brought out. Disturbance of the excavation surface and possible collapse

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