Construction method for diversion of flood discharge channel

Abstract

The invention discloses a construction method for diversion of a flood discharge channel, and aims to solve the problems that an existing flood discharge channel is crossed with a newly-built sinking tunnel, the current flood discharge channel crosses over a tunnel foundation pit, the tunnel foundation pit needs to be constructed and needs to be dismantled, and in order to ensure normal flood discharge of a reservoir during construction of the tunnel foundation pit, the existing flood discharge channel needs to be dismantled. And new diversion needs to be implemented before the flood discharge channel in the range of the foundation pit is dismantled. The diversion construction method comprises the steps that firstly, four reverse construction wells are constructed on the two sides of a flood discharge channel on the periphery of a tunnel foundation pit, five steel pipes are erected above the reverse construction wells to serve as new diversion steel pipes, water is guided to the new diversion steel pipes at the proper time, and finally the flood discharge channel to be dismantled in the range of the tunnel foundation pit is chiseled away. And the tunnel foundation pit can be normally subjected to foundation pit supporting, earth excavation and structural construction. Due to the fact that the new flow guide steel pipe is erected above the tunnel foundation pit, supporting and excavation of the tunnel foundation pit are not affected, according to the method, the concrete flood discharge channel box is newly built according to the specific gravity, the construction period is obviously shortened, and the flow guide steel pipe can be recycled.

Description

technical field [0001] The invention relates to the technical field of flood discharge and diversion construction of tunnel foundation pits, in particular to a construction method of flood discharge channel diversion. Background technique [0002] The flood discharge channel is mainly used for flood discharge from the upstream reservoir (480m on the east side). The reservoir releases water once a year in July and August. After that, the reservoir stores water. In November, it is decided whether to release water according to the situation. There is basically no water in the flood discharge channel during normal times. And during normal times, the riverbed is basically exposed, with only local trickles. [0003] The existing flood discharge channel crosses the tunnel plane, and the newly built subsidence tunnel must be supported by foundation pit and earthwork excavation before the tunnel structure can be constructed. During construction, the flood discharge channel located i...

AI Technical Summary

Problems solved by technology

[0005] In view of the problems of long construction period and high cost in the diversion of the flood discharge channel above the tunnel foundation pit in the prior art, the technical problem to be solved by the present invention is to provide a temporary flood discharge channel using 5 diversion steel pipes, through which the inverted well and flood discharge After the canal is connected, the construction of the sinking tunnel is carried out, and finally the flood discharge channel is restored in situ, which can reduce costs, improve construction efficiency, and shorten the construction period. Diversion construction method

Images