Design and Construction of the Circular Shape Shaft Using the Reverse Construction Method

Ziqiang Tang

doi:10.1051/e3sconf/202019802011

Abstract

Restricted by the environment and the city’s planning, some pipe jacking used for the HV cable tunnel have to pass through some roads which has been build. Different kind of equipment has certain applicability in the pipe jacking construction procedure, especially with the geological condition, and encountering in the boulder is a common problem in the residual soil or in the strong weathered rock stratum, in this situation, a vertical shaft is needed to remove the boulder. In order to save the site area, a new shaft which is in circular shape is designed, and this paper introduces the main procedure of how to design and construct the new circular shaft. In a Fuzhou HV cable tunnel, the new shape shaft clears away the stone in the clay successfully, and reduces the impact on the ground traffic, the design and construction procedure of the new shaft have been analyzed in this paper, which provides reference for similar construction.

Highlights

Slurry balance or earth pressure balance pipe jacking has been widely applied in all kinds of municipal pipe network and small diameter tunnel engineering constructions[1,2]
Because closed-end pipe jacking machines generally do not have the conditions for opening, in this case, the conventional solution is to locate the exact position of the obstacle and get the geometric parameters, use retaining structure of row piles or steel piles after excavation to remove blocks[4]
Because closed-end pipe jacking machines generally do not have the conditions for opening, in this case, the conventional solution is to locate the exact position of the obstacle and get the geometric parameters, the use of retaining structure enclosing row piles or steel piles, excavation after the pit wrecker

Summary

Introduction

Slurry balance or earth pressure balance pipe jacking has been widely applied in all kinds of municipal pipe network and small diameter tunnel engineering constructions[1,2]. Because closed-end pipe jacking machines generally do not have the conditions for opening, in this case, the conventional solution is to locate the exact position of the obstacle and get the geometric parameters, use retaining structure of row piles or steel piles after excavation to remove blocks[4]. Because closed-end pipe jacking machines generally do not have the conditions for opening, in this case, the conventional solution is to locate the exact position of the obstacle and get the geometric parameters, the use of retaining structure enclosing row piles or steel piles, excavation after the pit wrecker. According to geological formations conditions and the surrounding environmental conditions, the construction company choosesa φ3.8m outer diameter, section of 5.5m long full-cutting type pipe jacking machine.

Design of Horizontal Cross-section

Reversed Construction of Circular Shaft

Conclusions