Construction method for reinforcing soft formation in shield construction

Abstract

The invention discloses a construction method for reinforcing soft formation in shield construction, adopting a reinforcement mode which uses plain continuous walls as the major and jet grouting piles as the auxiliary; as the plain continuous wall is adopted in the invention, with partial support, the plain continuous wall can withstand external soil-water pressure to ensure the stability of a working face, and tunnel portals can be broken down in advance before launching shield construction to prevent confliction with the shield assembly and debugging; the bulk breaking and construction can be safely and quickly carried out on a connection access; the construction process is simplified; the requirements on plain continuous wall are relatively simple, joints do not need to be specifically made, then a pile jetting machine is adopted to punch continuously in the construction process; after the plain continuous wall is used for reinforcement, the reinforcement range is significantly reduced, particularly applicable for engineering sites with small construction sites, intensive underground pipelines, heavy traffic on the ground and near to the foundations of the buildings on the ground; the reinforcement cycle is shortened, the age for reaching required strength is short, and the cost of the entire end is relatively low.

Description

technical field [0001] The invention relates to a construction method for reinforcing weak ground in shield construction, which is suitable for shield tunnel construction in subway tunnels, and is mainly used in the reinforcement of the end of the shield in weak ground and the construction of cabin opening and tool change reinforcement. Background technique [0002] With the development of society, there are more and more underground projects, especially in energy, communication and urban municipal engineering construction, the application of trenchless construction technology is more and more extensive, and shield construction technology is the frontier technology in trenchless methods , are widely used in subway construction. At present, in the subway construction in Shenzhen, the geology is complex and changeable, especially in the reclamation area, where the ground is quite weak, and a slight disturbance will cause serious consequences. [0003] Drawing on the experienc...

AI Technical Summary

Problems solved by technology

At present, in the subway construction in Shenzhen, the geology is complex and changeable, especially in the reclamation area, the stratum is quite weak, and a slight disturbance will cause serious consequences

[0003] Drawing on the experience of domestic shield engineering construction, there is a high probability of problems occurring during the construction of the departure, arrival, and contact passages of the shield tunneling project. The ground will have a large settlement, which will endanger the safety of equipment and personnel.