Construction method for earth pressure balance shield construction pressure launching in subway tunnel engineering

Abstract

The invention provides a construction method for earth pressure balance shield construction pressure launching in subway tunnel engineering. According to the method, a tunnel portal extending ring is matched with rubberized cord fabric, a folding pressure plate and a spring steel plate dual-sealing device to maintain pressure, and replacement is carried out on in-bin residue earth of a launching ring during trial boring launching. According to the method, pressure can be built quickly and normally to reach earth pressure balance tunneling requirements by replacing the in-bin residue earth of the launching ring when the launching ring excavates during the shield launching, water burst risk and sand burst risk generated by directly breaking a tunnel portal are avoided, the construction period is shortened and the construction cost is reduced. According to the shield tunnel construction pressure launching construction method, the risk increased by directly breaking the tunnel portal can be avoided, the leakproofness of the tunnel portal can be ensured, construction pressure excavation can be quickly realized, cost is saved, and the construction safety of the shield tunnel can be guaranteed.

Description

technical field [0001] The invention belongs to the field of urban rail transit engineering construction, and relates to subway tunnel engineering, in particular to a construction method for constructing pressure origination of earth pressure balance shields in subway tunnel engineering. Background technique [0002] At present, experts and scholars at home and abroad have made many achievements in the construction technology of shield tunneling. The starting link of shield tunneling relies heavily on auxiliary construction methods. At first, chemical grouting was mainly used to strengthen the formation. Now it has gradually developed into safe and convenient construction methods such as high-pressure rotary jet grouting, deep stirring grouting, and freezing method. The ideal state of earth pressure balance in shield tunneling construction cannot be achieved as early as possible. Later, in the deep buried tunnel projects such as crossing rivers and rivers, the construction ...

AI Technical Summary

Problems solved by technology

The starting link of shield tunneling relies heavily on auxiliary construction methods. At first, chemical grouting was mainly used to strengthen the formation. Now it has gradually developed into safe and convenient construction methods such as high-pressure rotary jet grouting, deep stirring grouting, and freezing method. The ideal state of earth pressure balance for shield tunneling cannot be achieved as soon as possible

Later, in the deep buried tunnel projects such as crossing rivers and rivers, the construction method of temporary reinforced concrete box assisted starting, and the new construction method of mud-water balance shield using steel sleeves to assist receiving. Although this problem was solved, temporary steel bars were installed. Concrete boxes and steel sleeves occupy a long construction period, and the construction cost is relatively high

Images