Novel soil nail diameter expanding device and diameter expanding method

Abstract

The invention provides a novel soil nail diameter expanding device which comprises a core shaft knob, a core shaft, a core shaft knob advance and retreat control device, a drill rod and a cylindrical gear, wherein the core shaft knob and the cylindrical gear are connected through the core shaft; the cylindrical gear is positioned inside the drill rod; the novel soil nail diameter expanding device further comprises a first diameter expanding wing and a second diameter expanding wing; the first diameter expanding wing and the second diameter expanding wing are respectively connected onto the drill rod through connecting parts; a gear rack is respectively arranged on each of the first diameter expanding wing and the second diameter expanding wing; the gear racks are meshed with the cylindrical gear. The invention further provides a soil nail diameter expanding method. According to the novel soil nail diameter expanding device and diameter expanding method, the diameter of a soil nail hole at a soil nail anchorage section can be very conveniently enlarged to the size meeting the design requirement, so that the design purposes of economy, safety and reasonableness of a supporting structure can be achieved, and the construction cost is reduced.

Description

technical field [0001] The invention belongs to the field of building construction, in particular to a novel soil nail diameter expanding device and a diameter expanding method. Background technique [0002] Soil nailing is a foundation pit support technology. The function principle of the soil nail wall is to reinforce the slope of the foundation pit with soil nails made of steel bars and cement mortar. The length of the soil nail includes two parts: the free section and the anchor section. The free section refers to the part inside the linear sliding surface, and the anchor section refers to the part outside the linear sliding surface. Because the free section of the soil nail cannot provide tensile bearing capacity, it provides tensile bearing capacity. It is only the soil nail anchorage section. The soil nails currently used in the project have the same cross-sectional diameter as the free section and the anchor section, which cannot provide tensile bearing capacity, a...

AI Technical Summary

Problems solved by technology

The soil nails currently used in the project cannot provide tensile bearing capacity. The cross-sectional diameter of the free section and the anchor section is the same, and the waste is obvious. Increasing the tensile bearing capacity of the anchor section of the soil nail is an ideal way to reduce the project cost.

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