Underwater non-blasting demolition construction method for reserved rock bank

Abstract

The invention relates to the technical field of water conservancy and hydropower engineering tunnel construction, in particular to an underwater non-blasting demolition construction method for a reserved rock bank. The method comprises the steps that 1, after tunnel construction is completed, a tunnel inlet gate is closed, and a tunnel inlet vertical shaft is filled with horizontal pressure; 2, anadaptive long-arm excavator is selected according to the construction water depth, and a milling and excavating head is assembled at the end of a movable arm of the long-arm excavator; 3, an overwater construction platform used for bearing the long-arm excavator is built on the water surface according to the weight of the long-arm excavator; 4, the long-arm excavator is driven into the overwaterconstruction platform, and the milling and excavating head is controlled to dismantle the rock bank of the excavated part; and 5, after the rock bank is dismantled, the milling and excavating head isreplaced with a grab bucket, and slag materials are grabbed to be matched with a barge to be discharged. Compared with an underwater rock bank or rock plug blasting construction method, the method hasthe advantages of small construction disturbance, low requirements on geological conditions of a tunnel inlet and high adaptability by building the overwater construction platform to cooperate with the milling and digging head and the grab bucket to demount the reserved rock bank.

Description

technical field [0001] The invention relates to the technical field of tunnel construction in water conservancy and hydropower projects, in particular to a construction method for underwater non-blasting demolition of reserved rock ridges. Background technique [0002] Most of the earth-rock dams in my country were newly built in the 1950s to 1970s. The common type of water diversion structure is the under-dam culvert. Because the under-dam culvert often has safety hazards, it may threaten the seepage and structural safety of the earth-rock dam in severe cases. Therefore, in the reinforcement design of earth-rock dams, the culverts under the dam are often blocked and diversion tunnels are built. Since the reservoir of the reinforcement project is in operation, the reservoir cannot be emptied or the water level cannot be lowered below the elevation of the entrance of the new diversion tunnel during construction. Therefore, the construction of the new diversion tunnel faces un...

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Problems solved by technology

[0008] The purpose of the present invention is to address the defects of the prior art and provide a construction method for underwater non-explosive demolition of reserved rock sills, which has low requirements on rock mass quality and is suitable for situations where the terrain at the entrance of the tunnel is steep and the geological conditions are poor

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