DBPapers
DOI: 10.5593/sgem2011/s07.108

GEODETIC WORKS IN MICRO TUNNELING PROJECTS EXCAVATED BY PIPE-JACKING METHOD

AUTHOR/S: N. ERSOY, E. YAVUZ
Monday 1 August 2011 by Libadmin2011

11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 2, 255-262 pp

ABSTRACT

Installation techniques of pipes line, such as water, sewerage, gas etc. are changed nowadays. Because of conventional installation of pipes in trench has many disadvantages, such as disruption to traffic flow, loss of access, noise, additional safety
and technical problems with other buried services, trenchless pipeline technologies are
used widely nowadays. Settlements of the road surface are not to be expected as well as
road repair work is not necessary along the pipeline for trenchless installation.

There have been considerable advances in trenchless pipeline installation techniques
during the last decade. Pipe jacking, that is a method to install a pipeline section
trenchless from the jacking shaft to the target shaft, is one of these trenchless
techniques. The problems caused by trench techniques and their associated costs can be
reduced with pipe jacking method. Pipe jacking method can be used in micro tunnelling
technology.

Tunnel survey methods are also changed continuously depending on changes occured in
tunnel excavation methods. As a result of considerable advances in tunnel survey
methods, there is no need to make geodetic measurements in the tunnel. All geodetic
measurements can performed out of the tunnel automatically. Especially in micro
tunnels, geodetic measurements can not performed in tunnel, because the size of it is not
suitable to make measurements in tunnel. Because of the control of micro tunnel
alignment is performed by computer supported, accuracy of guiding of the tunnel
machine has been increased horizontally and vertically.

Because of increased work safety, accidents, that will be in tunnel excavation works,
have been decreased to minimum level by the new techniques developed in tunnelling. Because of the automation in tunnel works, persons, who work in tunnel project, and the equipments, that are used in tunnel project have been decreased, as a result of this, economical advantages have been obtained.

Keywords: Tunnel, Micro Tunnel, Pipe-jacking, Steering, Geodetic works, Laser.