Backfilling method of underground utility tunnel

A technology that integrates pipe gallery and ground, applied in filling, underwater structures, buildings, etc., can solve problems such as affecting traffic safety, affecting road traffic, complicated backfilling construction, etc., achieving good overall performance, preventing floating and moving, and constructing fast effect

Active Publication Date: 2019-06-25
CHINA COMM 2ND NAVIGATIONAL BUREAU 3RD ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Backfilling method of underground utility tunnel
  • Backfilling method of underground utility tunnel
  • Backfilling method of underground utility tunnel

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with drawings and embodiments.

[0029] Such as Figure 1 ~ Figure 3 Shown, the present invention comprises the following steps:

[0030] 1) Preparation before backfilling

[0031] Excavate the double-sided stepped trench 1, the height of each step 13 in the double-sided stepped trench 1 is equal, and the width of each step increases step by step from the ground to the bottom of the double-sided stepped trench 1, forming a large top and a small bottom. Stepped, the double-sided stepped groove 1 of the present embodiment has 7 steps 13 in total, and the connection surface between the multi-level steps 13 and the surrounding soil is in a zigzag shape, which can increase the bonding force between the backfill and the surrounding soil, and improve the bonding strength of the backfill. stability.

[0032] A layer of concrete cushion 2 is poured at the bottom of the excavated double-sided stepped trench 1...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D29/045E02D17/18
CPCE02D17/18E02D29/045
Inventor 顾亮王鹏茅兵海
Owner CHINA COMM 2ND NAVIGATIONAL BUREAU 3RD ENG
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