%0 Journal Article
	%A Osamu Igawa and  Hiroshi Kouchiwa and  Yuji Ito
	%D 2014
	%J International Journal of Civil and Environmental Engineering
	%B World Academy of Science, Engineering and Technology
	%I Open Science Index 85, 2014
	%T Sewer Culvert Installation Method to Accommodate  Underground Construction in an Urban Area with  Narrow Streets (The Development of Shield  Switching Type Micro-Tunneling Method and the  Introduction of Construction Examples)
	%U https://publications.waset.org/pdf/9997043
	%V 85
	%X In recent years, a reconstruction project for sewer 
pipelines has been progressing in Japan with the aim of renewing old 
sewer culverts. However, it is difficult to secure a sufficient base area 
for shafts in an urban area because many streets are narrow with a 
complex layout. As a result, construction in such urban areas is 
generally very demanding. 
In urban areas, there is a strong requirement for a safe, reliable and 
economical construction method that does not disturb the public’s 
daily life and urban activities. With this in mind, we developed a new 
construction method called the “shield switching type micro-tunneling 
method,” which integrates the micro-tunneling method and shield 
method. 
In this method, pipeline is constructed first for sections that are 
gently curved or straight using the economical micro-tunneling 
method, and then the method is switched to the shield method for 
sections with a sharp curve or a series of curves without establishing 
an intermediate shaft. 
This paper provides the information, features and construction 
examples of this newly developed method.

 

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