Method for treating tunnel collapse through dugand covered method

Abstract

The invention discloses a method for treating tunnel collapse through a dugand covered method, which relates to the filed of constructional engineering, and substantially aims to solve the problem that existing tunnel collapse is high in construction cost and large in safety risk, wherein segments which are not collapsed are reinforced, tunnel faces are blocked off by utilizing hole slag recovery until to a position of an arch crown, enable stone ballasts which collapse in collapsed cavities in the later stage to fall into positions above the arch crown, backfill holes and overfall holes are obligated when the funnel faces are blocked off, the overfall holes use Phi (Phi) 48mm steel pipes, a pipe head arranged on one end of the steel pipes stretches into the collapsed cavities for certain height, a pipe head arranged on one end of the steel pipes is exposed outside backfill bodies, the positions above the arch crown are filled back by adopting C25 pumped concrete after collapsed segments are sealed, the backfill thickness is 2.5m, and concrete protective layers are formed on the positions above the arch crown. Furthermore, in order to guarantee the whole stability of the pumped concrete, small grouting pipes are added from springing lines of the two sides of tunnels to the positions of haunches after the tunnel faces are backfilled and sealed, and then sealed segments are divisionally excavated, supported and protected after backfilling and grouting. The method for treating tunnel collapse through the dugand covered method has the advantages that the method for treating tunnel collapse through the dugand covered method reduces safety risk and is low in construction cost.

Description

Technical field: [0001] The invention relates to the field of construction engineering, in particular to a method for treating tunnel collapse by sealing the tunnel face and pumping concrete to fill first and then dig. Background technique: [0002] Safety accidents caused by tunnel collapse treatment are one of the biggest safety hazards in the tunnel construction process. In order to ensure project safety, open cut methods are generally used to deal with tunnel collapse for construction. If the site conditions are simple, you can choose the most cost-effective slope opening However, when the site conditions are limited, it is necessary to select vertical enclosures such as underground diaphragm walls and bored piles according to the buried depth of the tunnel project, and to add the construction of the internal support structure. The construction period is also difficult to guarantee. [0003] At present, the specific plan for dealing with the tunnel collapse is as follow...

AI Technical Summary

Problems solved by technology

The disadvantage of this scheme is that after the first collapse, several collapses (blocks) of different sizes will occur on the surface of the collapse cavity every day. There are many uncontrollable factors in the construction process