On Sep.14th,Yanshan Tunnel,the longest tunnel in the North distinct of China,which is from Zhangjiakou

to Tangshan has break through in advance.

The desigh of this tunnel has a single line with two holes,one of whose length is 21,153 metters and

another ones 21,154 metters.Yanshan Tunnel is the longest tunnel in the Zhang-Tang whole lines.

It is said that Yanshan Tunnel has complex geological condition,through the archean erathem strata.The

tunnel acrosses 19 pieces fault fracture zone,where are a lot of water,and the most volume is 0.2

million cubic meters.Faced with so many disadvantage factorys,such as difficult construction,complex

geological condition and so on,the building department put safty and quality at the first place and put

the some major hazard,like the prevention of tunnel collapse,the blasting damage as as a primary major

hazards management.Above all,it puts the Yanshan Tunnel as the higest risk tunnel.

There are a lot of domestic exports making inspect at the present and promting some useful measures.
Just as some exports said,the finished tunnel will be a significate landmark in the whole line of

Zhang-Tang tunnel,which laid out a foundation for its start in the year of 2015.

A tunnel,which can be completed with high performance and high efficient,needs high performance

construction machinery equipment,like bridge girder launcher for tunnel.Our company can also produce

this kind of bridge girder launcher for tunnel,which is saving cost,high efficiency,reducing the working

time,and guaranting the project completment successfully.