A construction method for continuous construction using a shield machine and its supporting station

Abstract

The invention discloses a construction method for continuous construction to construct subway stations by using a shield construction machine and a matched station thereof. The construction method comprises the following steps: construction cross passages for travelling and turning back of the shield construction machine are respectively formed in the two ends of a station to be excavated; after completing the construction operation of a shield tunnel respectively taking the two construction cross passages as a starting point and a terminal point, the shield construction machine moves to one end of the next shield tunnel to be constructed through the construction cross passage of the terminal point of the shield tunnel and turns back, and continues to excavate the next shield tunnel to be constructed until all shield tunnels of the station to be excavated are formed. The method can greatly reduce the abnormal working procedures of the shield construction machine, accelerate the construction progress, reduce project cost and enrich the station type model of the existing subway stations, and partly solves the problem of groundwater of deep subway construction.

Description

technical field [0001] The invention relates to the technical field of underground engineering, in particular to a construction method for continuous construction using a shield machine and a supporting station thereof. Background technique [0002] At present, the most commonly used construction methods in subway projects generally include open-cut method, shallow-buried underground method and shield tunneling method. However, with the gradual densification of the subway network in various cities in China, the burial depth of the line has further deepened, and many stations and sections have partially entered the confined water formation. Therefore, the traditional shallow burial and underground excavation method, which uses precipitation construction as an auxiliary construction method and requires no water on the face of the tunnel, has been greatly restricted. On the other hand, groundwater resources are increasingly protected, and macroeconomic policies do not allow la...

AI Technical Summary

Problems solved by technology

[0005] 1) For the construction of interval tunnels, the construction speed of the current shield tunneling method can reach more than 8 times that of the shallow buried underground excavation method; however, if combined with the station as a whole, the advantages of fast construction speed It has not been fully reflected. On the contrary, due to the poor flexibility of the shield tunneling method, it often causes delays in the construction period;

[0006] 2) The average single-line advancing mileage (about 3km) of each shield machine is far less than its service life (10km), so the utilization rate of the shield machine is low;

[0007] 3) The average tunneling speed and the maximum tunneling speed of the shield tunneling method are very different. The reason is that in the construction process of the shield tunneling method, in addition to the normal procedures such as shield tunneling, segment assembly, and unearthed transportation, most of the time is shielded. The structure is dismantled, hoisted out, transferred, assembled in the well or turned around, etc., which affects the average tunneling speed of the shield machine.

[0009] However, the above-mentioned shield tunneling construction method only solves the problem that the shield machine can pass through the continuous construction interval of the station, and this method itself also has some disadvantages:

[0012] It can be seen from the above that in the construction method of shield tunneling in the prior art, although the shield tunneling machine is used to form a shield tunnel through excavation, after the shield machine completes the excavation work, a large number of follow-up construction operations are required , the required station platform type can only be formed by expanding and excavating on the basis of the formed shield tunnel, so it is difficult to improve the construction progress, and the project cost is relatively high

In addition, the follow-up construction process is also relatively complicated, which has a great impact on the safety of the station, and even brings greater risks than a single construction station

In addition, since in the above-mentioned shield tunneling construction method, a large number of follow-up construction operations are required after the shield machine completes the excavation work, the waterproof performance of this method is poor, and it is difficult to solve the problem of deep subway construction. groundwater conundrum

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