Beijing DN800 polymer plastic escape pipeline

  Affected by the cold air going south, the temperature in Xicheng continued to drop
People changed their autumn clothes and put on thick cotton padded jackets
Just like the human body changing into winter clothes, recently, the Taihu Tunnel Project Department of Suzhou Wuxi Changzhou South Expressway of China Railway fourth Bureau has also applied a high-performance thermal insulation and moisturizing material to put thick & ldquo; on the main structure of Taihu tunnel; Cotton padded jacket;, Resist the erosion of cold wind and low temperature in winter
The weather is extremely cold, and the construction site of Taihu tunnel in the waters near the South Spring of Meiliang Bay, Taihu Lake, wutangmen is in full swing
At present, the construction of 540 meters of tunnel bottom plate and 50 meters of side wall has been completed
In order to avoid the freezing of the concrete of the main structure of the tunnel caused by the decrease of temperature, the project department attaches great importance to the construction quality and maintenance of the main structure of the tunnel
Especially after construction in winter, the requirements for thermal insulation and moisture retention of concrete are more strict
How to keep heat and moisture for the main structure of Taihu tunnel has become the top priority of the project quality management of the south Suzhou Wuxi Changzhou expressway project department
Through multi-party investigation and cooperation with professional institutions, the project department applied a concrete thermal insulation and moisturizing curing material, which is the main structure of Taihu Tunnel & ldquo; Add clothes to keep warm & rdquo;

Main precautions for quality control of Tunnel Engineering
1、 Quality control is analyzed from the aspects of design concept and construction method
The tunnels of the project are designed and constructed by NATM
This method mainly uses the theory of rock mechanics, through the advanced radar geological prediction, measurement and monitoring of the tunnel surrounding rock, adopts new support structures, and makes full use of the self-supporting capacity of the surrounding rock to guide the tunnel design and construction
It is characterized by the timely construction of thin-layer flexible shotcrete bolt support close to the surrounding rock near the excavation face, and the construction of advance support (such as advance bolt, grouting small conduit, pipe shed, etc
) when necessary, in order to control the deformation and stress release of the surrounding rock, so as to adjust the stress redistribution of the surrounding rock during the common deformation of the support and the surrounding rock to achieve a new balance, so as to maintain the inherent strength of the surrounding rock and make use of its self-supporting capacity to a large extent

As an important means of NATM, advanced radar geological prediction and monitoring measurement must be used to accurately determine the surrounding rock grade and conduct prior investigation, and scientifically and reasonably determine the following four aspects:
1、 Excavation method;
2、 Layout of support and appropriate time of support;
3、 Whether inverted arch is set and the time and method of setting;
4、 Whether auxiliary construction methods and types are adopted

Installation and laying of tunnel escape pipeline:
Tunnel escape pipeline adopts & phi; 800mm special polyethylene pipe, with standard pipe joint length of 3M and wall thickness of 30mm
The three connection methods are as follows:
1
Steel clamp connection
2
U-Wire chain connection
3
Steel hoop connection
The construction site shall prepare enough pipes and connecting materials according to the surrounding rock of the tunnel and the excavation method
In addition to the whole section of pipes, 1M, 2M and 3M short-section pipes and adapters shall be prepared at the same time

The tunnel escape pipe can be customized and processed according to the needs of the site, with convenient handling, simple, firm, tight and reliable connection, and temporary fixing measures shall be taken on the ground
The pipe orifice can be temporarily covered during construction, and it is easy to open and close

The starting point of the tunnel escape pipeline is at the end of the second lining, and the distance from the end of the second lining shall not be more than 5m
It is arranged from the lining working face to an appropriate position within 20m away from the excavation face
The pipeline is laid along one side of the initial support to the tunnel face, and the working rope is reserved in the pipe to facilitate escape, rescue, contact and transmission of various items
The longitudinal connection can be connected with the hoop with bolt hole, which is reinforced and connected with the joint of the two pipelines with bolts, Prevent the escape pipeline from being washed off in case of collapse

When the tunnel escape pipeline is moved in place by the secondary lining trolley, it shall be removed section by section during temporary removal
It is strictly prohibited to remove it in place at one time, so as to ensure the effectiveness of the escape pipeline at any time

When the tunnel escape pipeline passes through the excavation steps, it shall be arranged according to the extended steps and installed 135° The adapter shall be extended, and the overhead height and length of the pipeline shall not affect the construction and facilitate the opening of the escape window

The tunnel escape pipeline shall be flat, the inner wall shall be smooth, dry and smooth, and shall not be used for other purposes than emergency escape

Our company's new tunnel life-saving pipeline material has the advantages of light weight, convenient disassembly and handling; The pipeline has good toughness, high impact strength, high stiffness of pipeline ring, good pressure resistance, not easy to deform, and can be used repeatedly for a long time
The transportation department demonstrated the application of the new tunnel life-saving pipeline in the emergency rescue channel of tunnel construction
The structural size of the pipeline conforms to the principle of ergonomics
Through the impact resistance comparison test of the new tunnel life-saving pipeline and steel pipe, the reliability of the new life-saving pipeline applied to tunnel construction emergency rescue is verified

Detailed introduction
Our company's new tunnel life-saving pipeline material has the advantages of light weight, convenient disassembly and handling; The pipeline has good toughness, high impact strength, high stiffness of pipeline ring, good pressure resistance, not easy to deform, and can be used repeatedly for a long time
The transportation department demonstrated the application of the new tunnel life-saving pipeline in the emergency rescue channel of tunnel construction
The structural size of the pipeline conforms to the principle of ergonomics
Through the impact resistance comparison test of the new tunnel life-saving pipeline and steel pipe, the reliability of the new life-saving pipeline applied to tunnel construction emergency rescue is verified

Service details: Sun Zong 185-3886-9025 , 0379-65227507
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com
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