Pre-stress anchor cable structure applicable to underground powerhouse rock wall crane beam portion

Abstract

The invention provides a pre-stress anchor cable structure applicable to an underground powerhouse rock wall crane beam portion. Anchoring segments of the structure are divided into the inner anchoring segment and the outer anchoring segment; the inner anchoring segment is located on the inner side in a drill hole, and the outer anchoring segment is located on the outer side in the drill hole; a tensioning segment is located between the inner anchoring segment and the outer anchoring segment; and in the drill hole, a hole segment corresponding to the tensioning segment and a hole segment corresponding to the outer anchoring segment are partitioned through a slurry stopping bag, and cement slurry is poured in different stages. The pre-stress anchor cable structure applicable to the underground powerhouse rock wall crane beam portion can perform pre-stress anchor cable supporting of a system on a high-edge wall in time, and therefore surrounding rock deformation can be limited, stabilityand safety of a rock wall crane beam structure are guaranteed, and overall surrounding rock stability of an underground powerhouse is facilitated.

Description

technical field [0001] The invention relates to an excavation and support technology for underground powerhouses, in particular to a prestressed anchor cable structure suitable for crane beams on rock walls of underground powerhouses. Background technique [0002] In recent years, the construction of water conservancy and hydropower projects has developed rapidly. Due to the constraints of terrain and landforms, the powerhouses of hydropower stations mostly adopt underground structures. The support structure of the bridge crane in the underground powerhouse adopts the rock wall crane beam structure, which can not only reduce the span of the underground powerhouse, shorten the construction period, and save costs, but also can install and operate the bridge crane in advance, so it is widely used in the underground powerhouse of hydropower stations. [0003] With the continuous increase of installed capacity of hydropower stations, the span and height of underground powerhouses...

AI Technical Summary

Problems solved by technology

Adopting this support measure is equivalent to the lack of prestressed anchor cable support at the rock wall crane girder of the high side wall of the underground powerhouse. The load increases the deformation of the crane beam on the rock wall, which is unfavorable to the stability of the crane beam structure on the rock wall and the surrounding rock of the underground powerhouse.

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