Regulations on the safety implementation opinions for tunnel escape pipes:

1. Before tunnel construction, corresponding security measures must be equipped, especially the provision of escape pipes, which are essential to protect our workers from harm during critical times.

2. Tunnel construction projects must implement a time limit system for operations, and work on high-risk projects must cease at night.

3. Regarding the support of tunnel escape pipes, construction units must strictly manage the construction procedures of tunnel supports, prohibiting delays in support and exceeding safety spacing standards.

4. Where conditions allow, mechanized operations should be promoted to reduce the number of personnel. For escape pipes over 1km, the entry and exit of personnel and vehicles in tunnels less than 1km must also be regulated, prohibiting unrelated personnel from entering.

5. In tunnels, a special safety construction plan must be developed, a tunnel safety team established, and sufficient safety personnel allocated.

6. The construction unit should formulate emergency rescue plans according to regulations, establish emergency rescue teams, allocate emergency rescue personnel, and regularly organize emergency escape drills.

The material of the escape pipe used in tunnels is very important. What kind of material is better?

Verify the reliability of the escape pipe through the following 4 basic methods       Manager Sun （136-9888-7149）

1.Design of escape pipe structural dimensions 

      According to the research results of ergonomics by American expert Alvin·R·Tilly, the comfortable crawling height for a person during crawling is725mm. Alvin·R·Tilly pointed out that when crawling through the bottom entrance of a circular hole for full-body entry, the small diameter of the circular pipe is585mm. Therefore, the internal diameter of the new emergency rescue channel for highway tunnel construction must be≥585mm to ensure normal human passage. 

2.Design of the thickness and diameter of tunnel escape pipes 

    Thin-walled circular pipes experience little overall bending deformation in the lower structural half when subjected to lateral impacts from large energy boulders falling from the tunnel ceiling, with deformation mainly localized at the impact point. When the height of the falling boulder is h＝7m and the wall thickness is H＝24mm, the deformation value of the tunnel escape pipe is Δ＝0.048m, about 8% of the diameter of the circular pipe; when the height of the fall is h＝5m and the wall thickness is H＝24mm, the deformation value Δ＝0.038m, which is even smaller. At this time, after the deformation and denting of the tunnel escape pipe, the passage space inside the pipe is 740mm, meeting ergonomic requirements, allowing safe passage for individuals through the emergency channel. When the wall thickness is smaller, the deformation value increases, which may be unsafe. When the wall thickness is larger, although safety increases, the weight of the pipe also increases, leading to higher costs and difficulties in handling. Therefore, a wall thickness of 30mm is considered suitable for the design of tunnel escape pipes. 

3.Verification of escape pipe reliability

Material 1, Q235 spiral seam submerged arc welded steel pipe, specification Φ620×10. Yield strength σ1=215GPa, elastic modulus E1=210MPa; Poisson's ratio ν1=0.25.

Material 2, tunnel escape pipe (molecular weight about 2.5 million), specification Φ800×30mm, yield strength σ1=3.7GPa, elastic modulus E1=700MPa; Poisson's ratio ν1=0.42.

      The thin-walled circular pipe used for escape during tunnel construction is freely placed on a flat cushion layer. When impacted by falling rocks, the bottom of the circular pipe is mainly constrained by vertical and horizontal friction from the cushion layer. The distance from the impact specimen to the top of the circular pipe mainly depends on the excavation height of the tunnel cross-section. In this experiment, the maximum value H of the height from the center top of the tunnel to the top of the circular pipe is taken as 10m, and the boulders are released freely, impacting both the tunnel escape pipe and the steel pipe. The experimental results show that after being impacted, the boulders are ejected from the tunnel escape pipe, which suffers almost no damage and has good impact resistance; the steel pipe is crushed and deformed upon impact.  

Certification conclusion:

Due to the lightweight of the ultra-high molecular escape pipe, it is easy to assemble and transport; the pipe has good toughness and high impact strength, instantly deforming under strong external impacts, absorbing a large amount of impact energy, and then quickly restoring its original shape, providing extremely safe protection for emergency rescue in highway tunnel construction; the pipe has high ring stiffness, good pressure resistance, and is not prone to deformation. In the event of a collapse during highway tunnel construction, its bearing capacity and resistance to environmental damage far exceed that of ordinary pipes, including steel pipes.

Excellence of the new escape pipe:

1. Lightweight, only about 1/3 the weight of steel pipes, easy to assemble and transport.

2. The pipe has good toughness and high impact strength, instantly deforming under strong external impacts, absorbing a large amount of impact energy, and then quickly restoring its original shape, providing extremely safe protection for emergency rescue in highway tunnel construction.

3. The pipe has high ring stiffness, good pressure resistance, and is not prone to deformation. In the event of a collapse during highway tunnel construction, its bearing capacity and resistance to environmental damage far exceed that of ordinary pipes.

Luoyang Guorun, as a professional manufacturer of ultra-high molecular weight polyethylene pipes, places great importance on tunnel construction safety. Therefore, we have united elite teams from multiple company departments and communicated and discussed with several tunnel construction parties. After six months, we successfully overcame various technical challenges and produced ultra-high molecular escape pipes that can withstand high-altitude impacts from large boulders. Our factory is located in the Luoyang Airport Industrial Cluster Area on Chuangye Avenue, covering an area of more than 200 acres, with a factory building area of 20,000 square meters. In 2014, we established a joint R&D center for ultra-high molecular materials in cooperation with the Shanghai Chemical Research Institute. Subsequently, we established strategic partnerships with several domestic research institutions, including the Dawn Chemical Research Institute and Hunan Nonferrous Metal Research Institute, and became the pilot base of the Shanghai Chemical Research Institute.

The company possesses core technologies and rich experience in the field of ultra-high molecular weight polyethylene pipes with single-screw extrusion. We have obtained 2 invention patents and 13 utility model patents. “Professional and dedicated” has always been the goal pursued by Guorun people. The ultra-high molecular weight polyethylene pipes have been widely used in major metallurgical, mining, electric power, coal, chemical enterprises in China for many years and have received widespread recognition.

Luoyang Guorun New Material Technology Co., Ltd., welcome to visit our factory!

Sales manager: Manager Sun （136-9888-7149）

Factory address: China.Luoyang Airport Industrial Cluster Area.Within the Zhejiang Merchant Industrial Park

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