A Construction Method of Anchor Pipes for Large Deep Foundation Pit Support

Abstract

The invention discloses a construction method for driving a large-sized deep foundation pit supporting anchor pipe, comprising: fixedly welding two parallel steel pipes by using rebars to form an integrated parallel support, welding a formed triangular support by using rebars, resting one end of the welded parallel support on the triangular support with a rebar welded side of the parallel support facing down and the other end rested in a slope, adjusting design angle of the anchor pipe, fastening a pneumatic impact hammer by using hoop fixing rings in front and rear of the hammer, welding steel pipes to two sides of the hoop fixing rings with the steel pipes perpendicular to the pneumatic impact hammer, mounting the fixed pneumatic impact hammer in the whole steel pipe, aligning the front end of the processed anchor pipe to a design hole site, inserting the other end of the anchor pipe into the pneumatic impact hammer, holding the steel pipes of the hoop fixing rings on two sides of the pneumatic impact hammer by two operators, and starting the pneumatic impact hammer; the anchor pipe is not prone to deformation, the design angle is easy to control, construction period can be shortened, the cost can be reduced, construction is simple, construction quality is improved, and the method has been implemented successfully in project cases.

Description

technical field [0001] The invention relates to a large-scale deep foundation pit support anchor pipe drilling construction method, which belongs to the field of civil foundation pit support construction. Background technique [0002] With the rapid development of urban construction, a large number of high-rise and super high-rise buildings have been built more and more, and there have been more and more large-scale deep foundation pit projects. The site conditions and resistance conditions faced by foundation pit excavation are becoming more and more restricted Strictly, the use of traditional soil nailing support has limitations. It is only suitable for foundation pits with good geological conditions and low construction difficulty. It is difficult to construct in environments with complex geological conditions. [0003] Anchor support technology is to drive steel pipes into the soil layer to be supported. After grouting, the anchor pipe can have a certain pull-out resista...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of urban construction, a large number of high-rise and super high-rise buildings have been built more and more, and there have been more and more large-scale deep foundation pit projects. The site conditions and resistance conditions faced by foundation pit excavation are becoming more and more restricted Strict, the use of traditional soil nailing support has limitations. It is only suitable for foundation pits with good geological conditions and low construction difficulty. When encountering complex geological conditions, it is difficult to construct

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