Spillway tunnel bottom plate construction method

Abstract

The invention provides a spillway tunnel bottom plate construction method. The spillway tunnel bottom plate construction method comprises the following steps that underground earthwork is gradually excavated in a target area section by section to form a plurality of linear tunnel sections and a plurality of bent tunnel sections, all the linear tunnel sections and all the bent tunnel sections are finally communicated in sequence according to the excavation sequence to form a spillway tunnel, meanwhile, bottom plate units are built in a segmented mode in sequence in the extending direction of the spillway tunnel, all the bottom plate units are finally and sequentially connected according to the building sequence to form the spillway tunnel bottom plate, and when the bottom plate units are located in the linear tunnel sections, the corresponding bottom plate units are shorter than 8m, and when the bottom plate units are located in the bent tunnel sections, the corresponding bottom plate units are shorter than 4m. By the adoption of the technical scheme, disturbance to surrounding rock of the spillway tunnel is reduced, the surrounding rock is reinforced in time, water seepage is effectively prevented by excavating the spillway in a segmented mode, building the bottom plate units in a segmented mode and pouring concrete in a layered mode, and the safety protection performance is enhanced by building side wall units on the left sides and the right sides of the bottom plate units; and the concrete engineering construction quality is improved.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering, in particular to a construction method for a spillway bottom plate. Background technique [0002] A spillway is a water conservancy facility built to take the water accumulated in the reservoir. In the prior art, during the excavation of the spillway, rock plugs are often reserved at the end of the spillway, and then blasting The construction destroys the rock plug, so that the spillway and the reservoir are connected to guide the water flow out, so as to take the water source. In the prior art, when the rock plug is destroyed by blasting, the corresponding earthwork will be washed out by the water flow. If the rock plug earthwork If there are too many, the spillway tunnel will be blocked, resulting in a reduction in the flow of water flowing out of the spillway tunnel, which will affect the water intake effect of the spillway tunnel. In addition, the spillway is generally ...

AI Technical Summary

Problems solved by technology

[0002] A spillway is a water conservancy facility built to take the water accumulated in the reservoir. In the prior art, during the excavation of the spillway, rock plugs are often reserved at the end of the spillway, and then blasting The construction destroys the rock plug, so that the spillway and the reservoir are connected to guide the water flow out, so as to take the water source. In the prior art, when the rock plug is destroyed by blasting, the corresponding earthwork will be washed out by the water flow. If the rock plug earthwork If there are too many, the spillway tunnel will be blocked, resulting in a decrease in the flow of water flowing out of the spillway tunnel, which will affect the water intake effect of the spillway tunnel