Method for rebuilding diversion tunnel body into flood discharging tunnel body

Abstract

The invention discloses a method for rebuilding a diversion tunnel body into a flood discharging tunnel body. The method comprises the steps of 1, excavating the section of the original diversion tunnel body to the designed expanding excavation section of the flood discharging tunnel in an expanding mode; 2, mounting vertical reinforcing steel bars at tunnel edge walls; 3 pouring tunnel edge wall and tunnel top arch concrete according to construction demands; and 4, after the diversion is finished, pouring bottom plate concrete on an original diversion tunnel bottom plate, wherein the bottom plate concrete is poured in two layers from bottom to top, the pouring elevation of the lower concrete is higher than that of embedded steel plates; after the pouring of the lower layer concrete is finished, the upper layer concrete is poured after the reinforcing steel bars needed to be mounted in the upper layer concrete are welded with the embedded steel plates; the top face elevation of the upper layer concrete is the bottom plate elevation of the flood discharging tunnel after rebuilding; the strength level of the lower layer concrete is lower than that of the upper layer concrete. The method for rebuilding the diversion tunnel body into the flood discharging tunnel body has the main advantages of omitting the demolishing of poured reinforcing steel bar concrete in the built diversion tunnel, and ensuring the function demands on the tunnel in different periods.

Description

technical field [0001] The invention relates to the rebuilding of a hydraulic tunnel body in different construction periods, in particular to a method for rebuilding a diversion tunnel body into a flood discharge tunnel body. Background technique [0002] The diversion tunnel is a temporary building. In order to create conditions for dry land construction of the project, the water from the upper reaches of the river during the construction period is discharged through the diversion tunnel. Sexual buildings - flood tunnels. At present, when the diversion tunnel is converted into a flood discharge tunnel, another entrance is usually set above the diversion tunnel. The joint section of the diversion tunnel and the flood discharge tunnel is arranged in the form of a dragon with its head raised, and the rest of the section is a common tunnel body. [0003] At present, the commonly used reconstruction method for the existing tunnel body is to remove the poured concrete first, the...

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Problems solved by technology

[0003] At present, the commonly used reconstruction method for the existing tunnel body is to remove the poured concrete first, then expand the tunnel body according to the needs, and then pour new concrete. Reconstruction of a tunnel with a single function

For the reconstruction of the diversion tunnel body where the entrance building of the diversion tunnel has been built, the poured concrete of the tunnel body is difficult to remove, the concrete demolition range is large, and the requirements of both diversion and flood discharge must be met, the above-mentioned commonly used reconstruction methods are very difficult. Difficult to do

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