Assembly construction method of shield cutter head maintenance well with jacking after semi-excavation

Abstract

The invention discloses an assembly-type construction method of a semi-excavated rear jacking shield cutter overhauling well. The method comprises the following steps: the construction is pre-treated;an assembly-type locking ring assembly is fabricated at an excavation overhauling well, the layered excavation is performed on the overhauling well, an assembly-type support structure is set up as well wall support in the overhauling well until excavating to the top of the shield segment of the overhauling well, one-layer back cover is set, the shield segment is excavated by semi-excavation method, and once backfill is carried out after excavating; the shield tunneling machine is jacking to the predetermined position of the overhauling well, the semi-excavation area is re-excavated to the bottom of the well, the overhauling of the shield cutter is carried out, after the overhauling of the shield cutter, the assembly-type support structure is demolished in the overhauling well by bottom-upstratification, the backfill is followed up, the shield tunneling machine continues to tunnel after completing all the backfill. The method has the advantages of high construction speed, no residue in soil, no pollution, no effect on other projects, high safety and low construction cost.

Description

technical field [0001] The invention relates to the field of maintenance well construction, in particular to an assembled construction method for a maintenance well with a shield cutter head jacked after half-excavation. 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 the soil in the maintenanc...

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, the current full excavation method also has the problems of large excavation volume and large backfill volume, which affect the construction speed and maintenance efficiency 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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