Construction method of subgrade foam concrete filling technology adjacent to existing metro facility

Abstract

The invention relates to a construction method of a subgrade foam concrete filling technology adjacent to an existing metro facility. The construction method comprises the following steps of measurement and setting-out, foundation pit excavation, template mounting, foam concrete mixing and pouring, steel wire mesh laying and concrete maintenance. Foam concrete is poured in a blocking and layeringmanner and is divided into four sections longitudinally, into a left side and a right side transversely and into two layers vertically. The construction method has the beneficial effects that comparedwith ordinary concrete, the foam concrete has the characteristics of light weight, high strength, energy conservation and waste utilization; the advantages of the foam concrete is effectively exertedwhile the strength is improved; and in addition, by utilizing the foam concrete with different strengths for blocking and layering filling, the cost can be effectively saved, and the purposes of economy and effectiveness are achieved. By adopting the construction method provided by the invention, the additional load after subgrade soil replacement can be effectively reduced, the strength is ensured, the stability and safety coefficients of road engineering are increased, the engineering cost can also be lowered at the same time, the maintenance cost is reduced, and the social benefit is increased.

Description

technical field [0001] The invention relates to the technical construction field of roadbed foam concrete filling adjacent to existing subway facilities, in particular to a construction method of roadbed foam concrete filling technology adjacent to existing subway facilities. Background technique [0002] With the rapid development of the subway, new roads often cross the subway in many areas. According to the requirements of the design code, the covering soil load on the subway tunnel or station structure must be within the range that the structure can bear. If a road project is built above it, the load of the road structure layer will inevitably exceed the original covering soil load, so corresponding measures must be taken when constructing above the subway to reduce the additional load on its upper part. Under the principle of "maintaining the original state and maintaining balance as much as possible" for the upper load, the subgrade of the upper road within the scope o...

AI Technical Summary

Problems solved by technology

However, in actual construction, if the conventional road subgrade is used, the above requirement cannot be met. Therefore, foam concrete is selected, because the performance characteristics of foam concrete mainly include light weight, low density, good thermal insulation, and good pumpability. , strong waterproof ability, material saving

However, considering the surrounding environment of subway tunnels, ordinary foam concrete and construction technology still have some defects, such as low strength, easy cracking or water absorption of concrete, etc., which seriously restrict its wide application in the vicinity of existing subway conditions.

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