Filling device and method for abandoned air-raid shelter in pile foundation construction site

Abstract

The invention provides a filling device and method for an abandoned air-raid shelter in a pile foundation construction site. The filling method is to drill a grouting hole above the abandoned air-raid shelter to be filled, and install a primary grouting pipe, a secondary grouting pipe, an air supply pipe and an exhaust pipe, a primary grouting pipe and a delivery pipe in the borehole. The air pipe extends vertically into the bottom of the air-raid shelter, and the secondary grouting pipe and exhaust pipe extend vertically to the roof of the air-raid shelter; firstly, the primary grouting pipe is connected to the grouting pump, and the air supply pipe is connected to the air compressor, and the foam is injected in layers Concrete grouting slurry, after each layer of grouting, pull up the primary grouting pipe and the air supply pipe to the top of the cave; then connect the secondary grouting pipe to inject the foam concrete grouting slurry for the second time, and the secondary grouting does not supply air. The invention can solve the filling problem of the deep-buried air-raid shelter without excavation, and the filled construction site can ensure the normal construction of bored piles, which solves the problem that the deep-buried air-raid shelter cannot be normally constructed when the rotary drilling rig is constructing the poured pile foundation and site subsidence.

Description

technical field [0001] The invention relates to an engineering construction method, in particular to a filling device and method for filling an abandoned air-raid shelter at a pile foundation construction site with foam concrete for filling the air-raid shelter when the cast-in-place pile foundation encountered by a rotary drilling rig encounters a deep-buried air-raid shelter. Background technique [0002] Air-raid shelters are caves dug during the Anti-Japanese War to avoid the bombing of enemy artillery fire and to protect personal and financial safety. Many air-raid shelters began at the beginning of the outbreak of the Anti-Japanese War. Most of them were made of brick walls and stones, and there were also large buildings with concrete structures. With the urban transformation and the loss of some data, these air defense engineering structures are buried underground, and many buildings are buried deep and complex in terrain. It is difficult to find them in the prelimina...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that when the rotary drilling rig constructs the cast-in-situ pile foundation and encounters a deep-buried air-raid shelter, it cannot be constructed normally. The traditional method of excavation and replacement is low in efficiency and high in cost. Accident, and provide a kind of filling device and method of abandoned air-raid shelter in pile foundation construction site, using this device and method can be efficient, safe, environment-friendly and reduce engineering cost filling abandoned air-raid structure cavity without excavation, and at the same time It can ensure that the filling body does not affect the pile foundation construction work of the rotary drilling rig, and the filled air-raid shelter can normally carry out the construction of bored piles

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