Maintenance method and structure from tail water tunnel access door slot to outlet tunnel section

Abstract

The invention discloses a maintenance method and structure from a tail water tunnel access door slot to an outlet tunnel section. The maintenance method comprises the following steps: locally expanding a tail water outlet, arranging a group of longitudinal partition piers at the tail water outlet for dividing the tail water outlet into a plurality of gate holes, wherein each gate hole is providedwith a gate slot, and a maintenance gate is is arranged in the corresponding gate slot; connecting and locking the maintenance gates onto a locking beam of the tail water outlet maintenance platform by pull rods, and connecting, opening and closing the maintenance gates by the pull rods through a temporary crane. In case of not affecting tail water outlet flow and unit output, multiple maintenancegates are arranged at the tail water outlet to realize maintenance requirements and reduce opening-closing force of operating the maintenance gates, so that temporary equipment with relatively smalllifting force can be selected to meet requirements of operating the gates; and the maintenance gates at the tail water outlet are connected and locked onto the tail water outlet maintenance platform through the pull rods, and are conveniently assembled and disassembled, so that trouble of penetrating through a shaft underwater of the temporary crane is avoided better, and investment of adopting permanent opening-closing equipment can be saved.

Description

technical field [0001] The invention relates to a maintenance method and structure of a tailrace tunnel maintenance door slot to an exit tunnel section, and belongs to the technical field of metal structures of water conservancy and hydropower projects. Background technique [0002] At present, for the exit of the tailwater tunnel with unstable slopes, considering that the sand and rolling stones produced by the landslide will cause damage to the bent frame, fixed hoist and gate, etc., the maintenance gate is set in the tailwater tunnel, but there is tailwater The tunnel from the inspection door slot to the exit is difficult to repair because there is no water-retaining facility. Currently, the technology of setting up temporary cofferdam water-retaining repairs is used, but there are problems such as long construction period and large investment. Underwater, it is very difficult to use a temporary crane to open and close the underwater shaft, and the opening and closing for...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a maintenance method and structure for the tunnel section from the maintenance door slot of the tailrace tunnel to the exit tunnel, so as to solve the problem that the tunnel from the maintenance door slot of the tailrace tunnel to the exit is difficult to maintain due to the lack of water retaining facilities, thereby overcoming the existing There are deficiencies in technology

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