A Construction Method for Shallow Buried Shield Tunnel Crossing Expressway

Abstract

The invention discloses a construction method for enabling a shallow shield tunnel to pass through a highway. The construction method comprises the specific steps of first, construction preparation; second, preliminary grouting construction; third, settlement observation point setting; fourth, testing stage construction; and fifth, construction for passing through the highway. According to the construction method, the steps are simple, design is reasonable, and construction is convenient; slope grouting holes and ground grouting holes are formed to conduct preliminary grouting construction reinforcement on a reinforcement area above a tunnel shield area before shield construction, so that the personnel safety is guaranteed during tunnel shielding, the difficulty of shield construction is lowered, the stability of the ground surface of the highway is guaranteed during shield construction, and the construction process for enabling the shallow shield tunnel to pass through the highway is achieved.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a construction method for a shallow-buried shield tunnel crossing an expressway. Background technique [0002] In recent years, my country has carried out large-scale construction of urban municipal projects, especially the construction of subways. Shield tunnel construction has been widely used in subway construction. However, the development trend of urban modernization and functional intensification has higher and higher requirements for engineering construction. In many underground projects, due to the constraints of urban environmental factors such as construction sites and road traffic, traditional construction methods are difficult to apply. For example, the construction of the shield tunnel crossing the expressway, through docking with the expressway property rights unit and on-site investigation, the average hourly traffic flow of the road section ...

AI Technical Summary

Problems solved by technology

However, the development trend of urban modernization and functional intensification has higher and higher requirements for engineering construction. In many underground projects, due to the constraints of urban environmental factors such as construction sites and road traffic, traditional construction methods are difficult to apply

For example, the construction of the shield tunnel crossing the expressway, through docking with the expressway property rights unit and on-site investigation, the average hourly traffic flow of the road section reaches thousands of vehicles. If the excavation process is not well controlled or the reinforcement measures are not in place, the settlement will be relatively large. Large, damage the road surface of the expressway, especially when the tunnel crossing the expressway is a shallow tunnel and the pebble soil layer is above the tunnel shield area, the tunnel construction is prone to large settlement, which may cause the road surface to collapse, thereby endangering personal and property safety , causing serious consequences

Based on the special conditions of the expressway and the hydrogeological characteristics of the tunnel excavation surface, how to ensure the surface stability of the expressway is the key problem to be solved when the shield tunnel crosses the expressway. There is a lack of a shallow shield tunnel crossing the expressway. Construction method

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