Non-excavation reverse dismantling method for ultra-deep vertical shaft

Abstract

The invention discloses a non-excavation reverse dismantling method for an ultra-deep vertical shaft. The non-excavation reverse dismantling method comprises the following steps that (1) sealing, water stopping and reinforcing are conducted on a soil body around the ultra-deep vertical shaft and within a set range below the bottom of the ultra-deep vertical shaft; (2) an observation and emergency standby well is drilled in the periphery of the outer side of the reinforced soil body around the vertical shaft; (3) dismantling the internal structure of the vertical shaft layer by layer from top to bottom to guarantee a dismantling working face; when the internal structure of the vertical shaft is dismantled, the supporting structure mainly comprising the vertical shaft outer wall structure is dismantled layer by layer and confirmed to meet the design requirement layer by layer; (4) after the reinforced soil body below the vertical shaft reaches the design strength, a vertical shaft bottom plate is dismantled; (5) timely backfilling and tamping after the bottom plate of the vertical shaft is broken; (6) vertical ring-dividing dismantling is conducted from the bottom of the vertical shaft, and transverse first ring blocks are symmetrically dismantled; (7) timely backfilling and tamping within the dismantling depth range; and (8) the steps (6)-(7) are repeated, and ring-by-ring dismantling and ring-by-ring backfilling are conducted from bottom to top till dismantling and backfilling are completed. The method is simple in construction, high in efficiency and capable of saving cost and shortening the construction period.

Description

technical field [0001] The invention belongs to the field of building construction and municipal engineering, in particular to a non-excavation reverse demolition method for ultra-deep shafts. Background technique [0002] At present, there are a large number of existing ultra-deep abandoned shafts left underground in my country's cities, which has caused great difficulties for the subsequent development of the city, especially for the development of underground space. The conventional demolition method of underground shafts is open cut and smooth demolition. The main method of open cut is to excavate on slopes, excavate one layer, use a breaker to break and demolish one layer, and then backfill in layers. This method of excavation and demolition requires large excavation, The amount of backfill is large, the site is large, and it has a great impact on the surrounding environment. Another method of open cut is support excavation. Before excavation, an enclosure structure is ...

AI Technical Summary

Problems solved by technology

[0002] At present, there are a large number of existing ultra-deep abandoned shafts left underground in my country's cities, which has caused great difficulties for the subsequent development of the city, especially for the development of underground space.

The conventional demolition method of underground shafts is open cut and smooth demolition. The main method of open cut is to excavate on slopes, excavate one layer, use a breaker to break and demolish one layer, and then backfill in layers. This method of excavation and demolition requires large excavation, The amount of backfill is large, the site is large, and it has a great impact on the surrounding environment. Another method of open cut is support excavation. Before excavation, an enclosure structure is built around the shaft, a layer of support is installed, and a layer of structure is broken and demolished. Then backfill a layer, remove a layer of support, and finally pull out the enclosure structure. Although the excavation and backfill volume of this enclosure excavation and removal method is smaller than that of sloping excavation, the support volume is large and the cost is high. High and long construction period, the demolition is broken and demolished by breaking hammer, there is vibration, noise and dust pollution, and it is more and more restricted by environmental protection

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