Tensioning-force-adjustable anchoring body anchoring force constant load device

Abstract

The invention discloses a tensioning-force-adjustable anchoring body anchoring force constant load device comprising an inner pressure bearing body, an outer pressure bearing body and a pressure bag.The inner pressure bearing body and the outer pressure bearing body are composed of two parts which can relatively move in the axial direction. The pressure bag is of a hollow cylindrical structure, is arranged between the inner pressure bearing body and the outer pressure bearing body, and can extend in the axial direction after being pressurized so as to push the inner pressure bearing body andthe outer pressure bearing body to move relatively. According to the tensioning-force-adjustable anchoring body anchoring force constant load device, under the condition that deformation of a rock body is large, the tensioning force of an anchoring body can be kept to be constant, driving tensioning can be conducted, and the requirement of rock body anchoring under the corresponding condition is met.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a constant load device for an anchor structure. Background technique [0002] At present, in the field of support such as slopes or underground caverns, anchor rods and anchor cables are more commonly used types of support. Their existence can basically be divided into non-prestressed and prestressed types, and can also be divided into ordinary anchors. Rods (cables) and retractable anchors (cables). In general, the prestressed bolt (cable) mainly adapts to the deformation of the rock mass through the expansion and contraction of the rod (cable) body itself in the later stage, while the existing bolt (cable) body that adapts to the deformation of the rock mass has strong deformation ability, The rigidity is small, it is difficult to apply prestress, and the prestress is basically not adjustable after stretching. These reasons will lead to the breakage of the anchor when t...

AI Technical Summary

Problems solved by technology

In general, the prestressed bolt (cable) mainly adapts to the deformation of the rock mass through the expansion and contraction of the rod (cable) body itself in the later stage, while the existing bolt (cable) body that adapts to the deformation of the rock mass has strong deformation ability, The rigidity is small, it is difficult to apply prestress, and the prestress is basically not adjustable after stretching. These reasons will lead to the breakage of the anchor when the deformation of the rock mass is too large after the prestress is applied in the underground cavern or slope support. If there is no prestress in the early stage, the deformation of the rock mass cannot be effectively controlled, especially for geotechnical engineering bodies with high deformation limit targets, which also means anchorage failure.

Although the existing yielding concept anchor rod (cable) can realize the purpose of yielding according to the deformation of the anchor rod (cable) itself, it basically yields the pressure through its own deformation, and the yielding capacity and anchoring body cannot be effectively controlled in the later stage of deformation.

Images