Tunnel cross-section primary lining construction process

Abstract

The invention discloses a tunnel cross-section primary lining construction process. The tunnel cross-section primary lining construction process includes steps of S1, chiseling away the lower portionsof middle partition walls according to 6m sections, inverting primary supporting concrete in secondary lining thickness ranges, cutting off the lower portions of grid main reinforcements and formingfilling portions; S2, laying waterproof layers, binding reinforcing steel bars, pouring inverted arch concrete, pouring the filling portions and forming inverted arches; S3, detaching two ends of eachmiddle partition plate in 1m ranges, detaching the primary supporting concrete in the ranges of the tops of the middle partition walls and cutting off the grid main reinforcements; S4, erecting transverse formwork supports, mounting arch centers and formworks, pouring side wall and arch concrete and forming second linings; S5, erecting temporary supports, detaching temporary remaining braces, sequentially breaking down and detaching the middle partition walls and the middle partition plates from top to bottom and from edge to center and completely detaching temporary supporting. The tunnel cross-section primary lining construction process has the advantages that the residue earth generation volumes at earlier stages can be effectively reduced, the influence degree of residue earth outwardtransport on the progress can be lowered, and secondary lining which is a critical working procedure can be constructed in an acceleration manner in advance.

Description

technical field [0001] The invention relates to a tunnel section construction process, in particular to a tunnel section initial laying construction process. Background technique [0002] The CRD construction method is widely used in the large-section construction of subway underground excavation tunnels, but this method requires a lot of time for the removal of temporary partitions and partition walls during secondary lining, and the transportation of muck. At present, the environmental protection situation in Beijing and other places is severe. Due to the smog, the transportation of muck is not allowed. The windy weather does not allow muck to be transported outside. In addition to the influence of various political activities, the export of muck is often restricted, resulting in slow construction and easy to cause idle work. [0003] During the initial construction of some tunnel sections, the height and span of scaffolding are relatively large, and the period of erectio...

AI Technical Summary

Problems solved by technology

The windy weather does not allow the transportation of muck, and the influence of various political activities often leads to restrictions on the transportation of muck, resulting in slow construction and easy to cause layoffs

[0003] During the initial construction of some tunnel sections, the height and span of scaffolding are relatively large, and the period of erection and dismantling is relatively long, which poses a great potential safety hazard

In the early stage, the amount of temporary support and muck removal is large and time-consuming, and the transportation of muck is easy to affect the construction period.

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