Backfilling method of underground utility tunnel

Abstract

The invention discloses a backfilling method for an underground utility tunnel. The backfilling method for the underground utility tunnel comprises the following steps of (1) preparation before backfilling, (2) foal concrete backfilling, (3) small stone block casting, (4) loading processing of the top of the utility tunnel, and (5) backfilling of a top gravel or gravelly soil layer. The advantagessuch as lightweight, good overall performance, good low-elasticity shock absorption, great waterproof performance, low density, high construction speed, simple process, no residual settlement and noextrusion on the underground utility tunnel of foam concrete are fully utilized, and the harmful effects of freeze thawing on the underground utility tunnel and backfilling materials can be reduced. By means of the backfilling method, the bonding force of the backfilling materials and surrounding soil is increased, the stability of the underground utility tunnel is improved, no formwork needs to be erected at the two ends of the underground utility tunnel, and a clay formwork can be directly utilized, so that cohesiveness is improved and the cost is reduced.

Description

technical field [0001] The invention relates to a method for backfilling an underground pipe gallery, in particular to a method for backfilling an buried trench of an underground pipe gallery by using foam concrete instead of gravel soil, and belongs to the technical field of underground pipeline construction engineering. Background technique [0002] With the continuous development of urban road construction, various pipelines such as electricity, communication, water supply, and gas need to be buried in the ground to beautify the visual effects on both sides of the road and improve the overall image of the city. Various pipelines are centrally placed in the underground comprehensive utility gallery, thereby avoiding repeated excavation of the ground, affecting road traffic and citizens' travel. After the underground comprehensive pipe gallery is laid, it needs to be backfilled in time before laying the pavement. The existing urban underground comprehensive pipe gallery bac...

AI Technical Summary

Problems solved by technology

After the underground comprehensive pipe gallery is laid, it needs to be backfilled in time before laying the pavement. The existing urban underground comprehensive pipe gallery backfill materials are generally backfilled with water shake sand, lime soil, gravel soil and other materials. Although the backfill materials are easy to obtain, However, the backfilling construction is complicated, the filling speed is slow, the construction period is long, the density is high, the strength is low, and the settlement after completion is large, which will lead to the later settlement of the road surface, which will seriously affect the road traffic.

In addition, when the temperature rises and the ice melts in the underground comprehensive pipe gallery buried in the permafrost in high-latitude areas, the existing backfill materials will arch up and damage the road surface due to volume expansion after freezing and thawing, and the road surface will be damaged after being rolled by vehicles. Broken and potholed, seriously affecting traffic safety

Images