A green treatment method for abandoned underground air defense tunnels

Abstract

The invention discloses an environment-friendly handling method for an abandoned underground air raid shelter. The environment-friendly handling method is characterized by comprising the following steps that before filling, after field accumulated water is pumped and ventilation arrangement is completed, a curing agent is sprayed onto sludge from outside to inside in the channel direction, a powerful stirring head and a high-pressure water gun are combined and adopted to stir the sludge on site, and consolidated soil is formed; then, filling units are divided from inside to outside in the channel direction, a drill bit is adopted to drill the ground at the two ends of each unit downwards to penetrate through the arched top of the air raid shelter, light aggregate concrete is poured throughguide pipes, and end sealing walls are formed; the positions nearby the middles and two ends of the filling units are drilled to form filling holes and observing holes; finally, filling is conductedfrom bottom to top through the filling holes between every two sealing walls, the periphery and the top is subjected to filling in sequence, and materials are filled gradually from the low portion tothe high portion; and after the unit is filled, filling of the next unit is conducted. The environment-friendly handling method has the advantages that the strength of the filling body is improved, the filling effect is improved, disturbance to surrounding buildings is effectively controlled, the construction environment pollution is reduced, and visualization of the filling process is achieved.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, and in particular relates to a green treatment method for abandoned underground air defense tunnels. Background technique [0002] In the late 1960s and early 1970s, in response to the call of "digging deep holes, accumulating grain widely, and preparing for war and famine", a mass movement to build air-raid shelters was launched in cities and towns in our country. These civil air defense projects have no formal drawings, the construction is very random, and the construction quality is not high, so they are called early projects. At present, these early projects are aging, structurally damaged, and have serious safety hazards. Most of these early projects are close to scrapping or have been scrapped. If these abandoned underground air defense tunnels are not treated, it is easy to cause ground subsidence and bring danger. [0003] The disposal of abandoned underground civil air ...

AI Technical Summary

Problems solved by technology

However, it can be seen from the implementation effect that its strength is lower than 0.6MPa. In addition, the design index of the filling material does not reflect the characteristics of the underground civil air defense tunnel being eroded by groundwater for a long time, and the requirements for water absorption and durability are not considered.

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