Arch bridge skewback excavation construction method applicable to steep mountain massif

Abstract

The invention relates to an arch bridge skewback excavation construction method applicable to a steep mountain massif. The arch bridge skewback excavation construction method applicable to the steep mountain massif includes the steps: dividing an excavation position of a skewback into multiple excavation layers, and performing excavation layer by layer from the top down; when excavating each layer, drilling multiple horizontal drill holes along the bottom surface of each excavation layer, drilling a vertical drilling hole corresponding to each horizontal drilling hole along the side wall of each step of the skewback, and enabling hole bottoms of the vertical drilling holes to communicate with the corresponding horizontal drilling holes; enabling a cutting rope of a rope saw to pass throughall the vertical drilling holes and the corresponding horizontal drilling holes communicating with the vertical drilling holes, lengthways cutting the excavation layers into a plurality of rock slices, and then using a rock crushing device to crush and clear all the rock slices; and completing excavation of the skewback after excavating out all the excavation layers. The arch bridge skewback excavation construction method applicable to the steep mountain massif can solve the puzzle that mechanical excavation cannot be adopted on the steep mountain massif, prevents an over-excavation phenomenon or perturbance to a rock body in blasting excavation, and guarantees the excavation size of the skewback.

Description

technical field [0001] The invention belongs to the technical field of arch bridge abutment foundation pit excavation, and in particular relates to a construction method in which the abutment is located on a steep mountain or in a geographical environment where blasting construction is not suitable, and the abutment is cut and excavated by using a wire saw. Background technique [0002] Bridges across rivers (valleys) in mountainous areas often adopt the structural form of steel pipe arch bridges. The abutments of the arch bridges are set on the mountains on both sides, and are formed by excavating directly on the rocks of the mountains. figure 1 Shown is the abutment design excavation structure located on the mountain, figure 1 The dotted line in the figure indicates the contour line of the abutment to be excavated, including 3 steps, and each step has a horizontal plane and a vertical side wall; the right side of the dotted line is the mountain body, and the left side of t...

AI Technical Summary

Problems solved by technology

The usual excavation method is the blasting method, but the disadvantages of the blasting method are that it is easy to cause over-excavation and the shape of the abutment is irregular, and the second is that it is easy to cause damage to the stability of the mountain slope and affect the safety of the bridge; and in some In the construction area, because of environmental protection or the need to ensure navigation, blasting construction is not allowed

Although the use of mechanical excavation can effectively control over-excavation, but on steep mountains, construction machinery cannot be deployed and used

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