Assembled construction method of shield cutterhead maintenance well with jacking first and then excavation

Abstract

The invention discloses an assembly type construction method of a shield cutter disc overhauling well with a mode of pushing first and excavation second, which comprises the following steps of: pre-treating construction; carrying out excavation at the overhauling well and preparing an assembly type locking wellhead; carrying out stage excavation on the overhauling well, wherein an assembly type support structure is arranged in the overhauling well by layers as the support of the well wall until the top layer of the shield section of the overhauling well is excavated, and then the earthwork isbackfilled to the place 3 meters above the shield machine for the pushing of a shield machine; the shield machine is pushed into the preset position of the overhauling well, and the earth is excavatedto the top layer of the shield section again. Only a semi-ring structure of one side area of the support far away from the shield excavated from the shield section to the bottom of the well, performing shield cutter disc overhauling, the assembled support structure in the overhauling well is disassembled from bottom to top after the shield cutter disc overhauling is finished, and the following backfilling is carried out, the shield machine continues to tunnel after the full backfilling is completed. By adopting the method, the construction speed of the overhauling well is improved, no residueexists in the soil body, no pollution is caused, no influence on other projects is caused, the safety is high, and the construction cost is low.

Description

technical field [0001] The invention relates to the field of maintenance well construction for shield tunneling, in particular to an assembled construction method for a shield cutter head maintenance well that is jacked first and then excavated. Background technique [0002] In the current construction of tunnels and subways, shield tunneling technology is required. In the existing shield construction, it is necessary to overhaul the shield cutterhead during the construction process. Currently, to overhaul the shield cutterhead, it is necessary to set maintenance wells at intervals on the excavated route. However, in the current shield cutter head maintenance well, after excavation, the shaft wall is formed by concrete pouring. After the shield cutter head is repaired, when the maintenance well is ready to be backfilled, the concrete shaft wall is relatively strong and cannot be removed from the ground. To recycle the concrete well wall, it has to be left in the land, and t...

AI Technical Summary

Problems solved by technology

However, in the current shield cutter head maintenance well, after excavation, the shaft wall is formed by concrete pouring. After the shield cutter head is repaired, when the maintenance well is ready to be backfilled, the concrete shaft wall is relatively strong and cannot be removed from the ground. To recycle the concrete well wall, it has to be left in the land, and the soil in the maintenance well is backfilled. The problem caused by this is: because the concrete well wall remains in the land, it will have an adverse effect on the construction of other subsequent projects, which is not only poor in environmental protection but also Low construction efficiency

At the same time, in the current full excavation method, if the soil structure is particularly unsuitable for excavation, if the shield section of the maintenance well is excavated first, it will affect the construction speed of the maintenance well

Moreover, in the construction of maintenance wells with concrete, especially in projects such as urban subways, due to the narrow operating space, complex operating environment, and various types of construction machinery, it is easy to cause injuries to operators and is subject to many nearby risk sources such as dense pipelines. impact, and it is not convenient for safe construction

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