Use of escape pipe for safety escape passage of Tianjin tunnel

  Jinan Yellow River tunnel, also known as jiluo road through Yellow River tunnel, is a tunnel jointly built by highway and subway on Di the Yellow River
At present, it has entered the full-scale construction period
When the media in Jinan, Shandong Province are still scrambling to report on the mother river - the Wanli Yellow River Di tunnel, it is unknown that there are ten river crossing tunnels that have been built and opened to traffic in China's other mother river, the Yangtze River, and four tunnels are under construction
The di one tunnel crossing the Yangtze River is the Wuhan Yangtze River tunnel
The project broke ground in November 2004
On April 19, 2008, the Wuhan Yangtze River tunnel was opened to traffic on December 28, 2008

At present, among the ten river crossing tunnels that have been built and used, they are distributed in Wuhan, Nanjing and Shanghai
Among them, Wuhan Zui accounts for more than half, Nanjing accounts for four, and Shanghai has one, but this is the Zui long river crossing tunnel on the Yangtze River

 
Measurement and observation of tunnel escape pipeline
When the tunnel is shallow buried, the monitoring network must be set on the surface and monitored
When the vault subsidence or horizontal convergence rate reaches 5mm / D or the cumulative displacement reaches 100mm, the construction shall be suspended, the causes shall be analyzed and the treatment measures shall be put forward
(these empirical data are very important)
When measuring with a ruler, the hook of the measuring point shall be made into a closed triangle to ensure no deformation and point contact, and the buried point shall not be welded in the steel frame

Control measurement is to use special instruments and tools to observe the deformation and stress of surrounding rock and support structure and the relationship between them during tunnel construction, and evaluate its stability and safety, so as to verify and adjust the construction method and structural support parameters
Tunnel construction safety; Eyes & rdquo

What are the special requirements for the material selection of ultra-high polymer escape pipes?
The material selection of escape pipes shall meet the following two requirements:
1
The impact resistance of the escape passage is good and can withstand the violent impact of large stones when the tunnel collapses
2
The diameter of the escape passage should be large
Generally, the specification of the commonly used escape passage is dn800-dn860mm
The pipe of this specification is more suitable for human crawling

Main construction methods of tunnel before use of ultra-high polymer escape pipeline
A section of open cut tunnel is set at the entrance and exit of the tunnel, which is constructed by open excavation method
Excavation shall be carried out according to the site engineering geological and hydrogeological conditions and in the spirit of & ldquo; Early in, late out & rdquo; Excavate according to the principle of
The reinforced concrete construction of open cut tunnel shall be carried out in time after excavation to ensure the safety of tunnel construction
The earthwork of the open cut tunnel is excavated mechanically, and the stonework is drilled with 7655 air gun for control
During the construction, try to avoid disturbance to the front slope and side slope of the tunnel portal, and strengthen the observation of the slope
If there are signs of landslide during the excavation, take reinforcement measures in time, and take the method of retaining the core soil
First lining the open tunnel and the tunnel portal, and then excavate the core soil

2
Tunnel entry construction
When the portal slope protection and initial support are completed, the open cut tunnel pouring is completed, and the concrete reaches the allowable strength, the middle wall pilot tunnel opening and side wall pilot tunnel excavation shall be carried out

3 excavation
Excavation method: the tunnel is a class II surrounding rock
It is proposed to adopt the three heading pit first wall and then arch method for construction
The specific construction method is as follows: excavate the middle partition wall during tunnel excavation, and pour the middle partition wall concrete after completing the initial support; Then excavate the walls on both sides, and pour the secondary lining concrete of the side wall after completing the initial support; Finally, the vault part shall be excavated
After the initial support is completed, the secondary lining concrete of the vault part shall be poured

The characteristics of escape pipeline are reflected in many aspects:
1
The ultra-high molecular weight tunnel escape pipeline has low material cost and saves procurement cost for engineering projects

2
Strong corrosion resistance, simple and fast construction, and the service life can reach 20-50 years

3
It also has good corrosion resistance and impact resistance at low temperature

4
High toughness and good impact strength

5
Reasonable design and convenient installation
Prepare connecting parts at the pipe end and lift the hanging ring
Ensure convenient installation, lifting and

6
The inner wall of the ultra-high molecular weight tunnel escape pipe is smooth
When an accident occurs, the escape speed is fast and it is not easy to cause secondary scratch

7
Ultra high molecular weight materials have the characteristics of high impermeability and high mechanical properties
The comprehensive performance is good, so it is applied in many tunnel projects

Luoyang Guorun new material produces ultra-high polymer tunnel escape pipes, new tunnel escape pipes and steel escape pipes
The new tunnel escape pipeline has the advantages of light weight, impact resistance, convenient disassembly and handling, and provides a reliable guarantee for tunnel emergency rescue!
Section length of escape pipeline: generally 3 M / section or 6 m / section, which can also be made to scale according to needs, and each line is configured with 30-60 meters
The escape pipeline of Guorun Xincai tunnel adopts a new material - ultra-high molecular weight polyethylene
Guorun escape pipeline is a safety material recommended by China Railway, CCCC, China tunnel, bridge and tunnel, road and bridge engineering company

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