浅覆土大管径高水位穿既有道路顶管施工技术

Construction Technology of Pipe-jacking with Large Diameter and High Water Level Crossing Existing Roads in Shallow Covering Soil

成都锦江东22路西段雨水管道(Y0~Y1)需穿越既有市政道路后,连接对侧既有雨水管网流入锦江。经技术方案对比分析,结合类似工程施工经验,为保证既有道路车辆的正常通行、避免开挖路面造成的市容环境扬尘污染、不影响城市居民正常生活出行等,采用顶管结合人工挖掘施工的方法。本文主要阐述在浅覆土、大管径、高水位,且地质条件校差的施工条件下,通过采取合理井点降水、顶管工作井及后背墙施工,以及管道前方土体加固等施工工艺,保证了顶管施工的顺利进行。同时结合道路沉降监测,沉降量控制在允许范围内,确保了顶管施工质量和市政道路的正常通行使用,为今后类似工程提供了可参考实例。

The rainwater pipeline (Y0~Y1) in the west section of Jinjiang East 22 Road in Chengdu needs to cross the existing municipal roads, and connect the rainwater pipe network on the opposite side to flow into Jinjiang River.Through comparative analysis of technical solutions and construction experience of similar engineering, the method of pipe jacking combined with manual covert excavation is adopted, so as to ensure the normal traffic of existing road vehicles passing normally, avoid the dust pollution of the city environment caused by excavation of the road surface, and do not affect the normal life and travel of urban residents.In the paper, the pipe jacking construction is guaranteed smoothly by adopting reasonable well point dewatering, pipe-jacking work well and back wall construction, as well as soil reinforcement in front of the pipe under the poor construction conditions of shallow covering soil, large pipe diameter, high water level and so on.At the same time, combined with road settlement monitoring, the settlement is controlled within the allowable range, which can ensure the construction quality of the pipe-jacking and the normal use of municipal roads.It could provide reference examples for similar projects in the future.