Multi-bag type joint-expanded anchor rod and foundation pit supporting construction method

Abstract

The invention discloses a multi-bag type joint-expanded anchor rod and a foundation pit supporting construction method. The multi-bag type joint-expanded anchor rod is applied to foundation pit engineering and comprises a cushion block and a steel pipe, wherein the cushion block is fixed to a slope of a foundation pit, and the exposed end of the steel pipe serving as an anchor rod body is fixed to the cushion block. A pressure bearing plate connected with the outer wall of the steel pipe is fixed to the end face of the cushion block. A one-way valve is arranged at the exposed end of the steel pipe located in the foundation pit. A plurality of rubber membranes are fixed to the part, stretching into rock and soil, of the steel pipe at intervals. Through holes used for filling the interiors of the rubber membranes with cement slurry through pressure are formed in the steel pipe wall covered with the rubber membranes. According to the multi-bag type joint-expanded anchor rod and the foundation pit supporting construction method, the rubber membranes are bulged by injecting the slurry into the steel pipe through pressure, so that the contact area of the anchor rod and a soil body is increased, and mutual bonding resultant force is increased; in addition, through pressure grouting, a soil layer in the contact range of the anchor rod is compacted, bonding strength is improved, meanwhile, the soil body on the front parts of the bulged portions of the rubber membranes is pressed to form pulling resistance, the supporting effect is improved, the length of the steel pipe can be reduced sufficiently, and cost is reduced.

Description

Technical field [0001] The invention relates to the technical field of construction engineering, in particular to a construction method of a multi-capsule type expansion bolt applied to geotechnical engineering and foundation pit support. Background technique [0002] The use of anchoring technology in geotechnical engineering can improve the strength and stability of the rock and soil itself, reduce the size of the structure and reduce its own weight, save engineering materials, and the anchoring technology has become a way to improve the stability of geotechnical engineering and solve complex geotechnical engineering One of the effective methods of the problem. With the broadening and development of anchoring technology, anchor rods are used in almost all aspects of civil engineering and construction, and their application fields are expanding day by day. In the face of increasingly complex construction environments, a single anchor rod can no longer meet the needs of the deve...

AI Technical Summary

Problems solved by technology

However, the further development of many new anchor rods is restricted due to high engineering cost, difficult construction and narrow application range.

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