Construction method for exchanging shield ventral brush

Abstract

The invention relates to a construction method for replacement of tail brushes of a shield, wherein, a tail device of a shield machine is provided with preset freezing pipes. The invention comprises the following operation steps that: replacement of the tail brushes is determined; a propulsion parameter of the shield is adjusted, and the shield posture is controlled; a special freezing ring is assembled in front of a common ring by utilization of freezing segments; the freezing pipes and temperature tubes are buried into the freezing segments in advance; a special replacement ring which is used for replacement of the tail brushes is assembled in front of the special freezing ring; the freezing pipes and freezing equipment are connected; the peripheral soil mass of a shield tail is frozen,and a freezing purdah for waterstop is formed on the rear of the tail brushes; the tail brushes are replaced one by one under the protection of the freezing purdah, and waterproof greases are infusedinto the tail brushes; the freezing purdah is forced to be unfrozen after replacement of the tail brushes is finished; normal propulsion of the shield is restored. The construction method for replacement of the tail brushes of the shield has the advantages of good waterstop effect, safety and reliability, simple and convenient operation and strong environmental suitability, is widely suitable forvarious complex special geological conditions and is particularly suitable for construction of a large-scale large-diameter bridge tunnel.

Description

Technical field: [0001] The invention relates to a maintenance method for shield tunneling equipment, in particular to a construction method for replacing a sealing wire brush at the tail of a shield tunneling machine during tunnel construction, and belongs to the field of tunnel construction engineering. Background technique: [0002] With the development of urban construction in our country, there are more and more underground projects such as underground rail transit and cross-river tunnels, and the shield tunneling distance of tunnels is also getting longer and longer. However, after the shield machine is continuously propelled for a long distance, the sealing wire brush at the tail (hereinafter referred to as the shield tail brush) will be damaged due to excessive wear, which will lead to the failure of the shield tail seal. In order to ensure the smooth and safe progress of shield tunneling, many measures will be taken during tunnel shield construction to ensure the qu...

AI Technical Summary

Problems solved by technology

This construction method is only for the replacement of the shield tail brush of the earth pressure subway shield, its applicability is limited, and it is a passive replacement. The water-stop effect is poor, and it is difficult to meet the requirements of the actual project; in addition, the shield tail brush replacement method described in the article can be applied to very limited types of strata, and it is difficult to apply to soft soil, high water pressure and other stratum conditions; at the same time, from the replacement pipe From the point of view of the way of the piece, the method described in the article needs to rotate the wedge-shaped segment continuously, and the segment cannot be put back in time when an accident occurs

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