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Construction Materials-Other Building Materials
**Tunnel Escape Pipeline** Safety Implementation Guidelines:
1. Before tunnel construction, corresponding security measures must be equipped, especially the provision of escape pipelines, which are essential to protect our workers from harm in critical situations.
2. The tunnel engineering construction must implement a work time limitation system, and operations with higher risks must be stopped at night.
3. Regarding the support for the tunnel escape pipeline, the construction unit must strictly manage the construction process of tunnel support, and it is strictly prohibited to delay support or exceed safety spacing.
4. Where conditions allow, mechanized operations should be promoted to reduce the number of workers. For escape pipelines longer than 1km, the entry and exit of personnel and vehicles in tunnels shorter than 1km must also be regulated, and unauthorized personnel are strictly prohibited from entering.
5. For the tunnel, a special safety construction plan must be developed, and a tunnel safety team must be established with sufficient safety personnel.
6. The construction unit should formulate emergency rescue plans as required, establish emergency rescue teams, equip emergency rescue personnel, and regularly organize emergency escape drills.
The material used for the escape pipeline in the tunnel is very important. What kind of material is the best?
The reliability of the escape pipeline can be verified through the following four basic methods.
1. **Design of Escape Pipeline Structural Dimensions**
According to the research results of American expert Alvin R. Tilly, a pioneer in anthropometry, the comfortable crawling height for a person is 725mm. Tilly pointed out that the small diameter of a circular opening for crawling through, when fully entering and exiting, must be at least 585mm. Therefore, the inner diameter of the new emergency rescue channel for road tunnel construction must be ≥585mm to ensure normal passage for the human body.
2. **Design of Thickness and Diameter of the Tunnel Escape Pipeline**
In the event of lateral impact from large rock masses at the top of the tunnel, the overall bending deformation of the lower part of the thin-walled circular pipe is relatively small, with deformation mainly concentrated at the point of impact. When the falling height h = 7m and wall thickness H = 24mm, the deformation value of the escape pipeline is Δ = 0.048m, approximately 8% of the pipe diameter; when the falling height h = 5m and wall thickness H = 24mm, the deformation value Δ = 0.038m, which is even smaller. At this time, the passage space inside the escape pipeline is 740mm, meeting ergonomic requirements, allowing safe passage for individuals. When the wall thickness is small, the deformation value increases, which may pose safety risks; 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 for the escape pipeline is deemed appropriate.
3. **Verification of Escape Pipeline 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 pipeline (molecular weight approximately 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 in tunnel construction is freely placed on a flat cushion. When subjected to impact load from falling rocks, the bottom of the circular pipe is mainly constrained by vertical and horizontal friction from the cushion. The distance from the impact test piece to the top of the circular pipe mainly depends on the excavation height of the tunnel section; in this experiment, the maximum height H from the center top of the tunnel to the top of the circular pipe is taken as 10m. The rocks are released freely, and impacts are tested on both the tunnel escape pipeline and the steel pipe. The experimental results showed that after the impact, the rocks were ejected, and the escape pipeline suffered almost no damage, demonstrating good impact resistance; the steel pipe was crushed and deformed upon impact.
**Certification Conclusion:**
Due to the lightweight ultra-high molecular escape pipeline, it is easy to disassemble and transport; the pipeline has good toughness and high impact strength, instantly deforming upon strong external impact, absorbing a large amount of impact energy, and quickly returning to its original shape, providing extremely safe protection for emergency rescue in road tunnel construction; the pipeline has high ring stiffness, good pressure resistance, and is not easily deformed. In the event of a collapse during road tunnel construction, its load-bearing capacity and resistance to environmental damage far exceed that of ordinary pipes, including steel pipes.
**Excellence of the New Escape Pipeline:**
1. Lightweight, only about 1/3 the weight of steel pipes, easy to disassemble and transport.
2. The pipeline has good toughness and high impact strength, instantly deforming upon strong external impact, absorbing a large amount of impact energy, and quickly returning to its original shape, providing extremely safe protection for emergency rescue in road tunnel construction.
3. The pipeline has high ring stiffness, good pressure resistance, and is not easily deformed. In the event of a collapse during road tunnel construction, its load-bearing capacity and resistance to environmental damage far exceed that of ordinary pipes.
As a professional manufacturer of ultra-high molecular weight polyethylene pipelines, Luoyang Guorun places great importance on tunnel construction safety. Therefore, we have united elites from multiple company departments and communicated and discussed with various tunnel construction parties. After half a year, we finally overcame various technical difficulties and successfully produced ultra-high molecular escape pipelines that can withstand the impact of large rocks from high altitudes. The company's factory is located in the Luoyang Airport Industrial Cluster Zone on Chuangye Avenue, covering an area of over 200 acres, with a workshop area of 20,000 square meters. In 2014, we established a joint research and development center for ultra-high molecular materials in cooperation with the Shanghai Chemical Industry Research Institute. Subsequently, we established strategic cooperative relationships with several domestic research institutions, including Liming Chemical Research Institute and Hunan Nonferrous Metals Research Institute, and became a pilot base for the Shanghai Chemical Research Institute.
The company possesses core technology and rich experience in the field of ultra-high molecular weight polyethylene pipelines, having obtained 2 invention patents and 13 utility model patents. "Professional and dedicated" has always been the goal pursued by Guorun people. Ultra-high molecular weight polyethylene pipelines have been used in major metallurgical, mining, electric power, coal, and chemical enterprises in China for many years and have been widely recognized.
Luoyang Guorun New Material Technology Co., Ltd. welcomes you to visit our factory for inspection!
Sales Manager: Sun (136-9888-7149)
Factory Address: China, Luoyang Airport Industrial Cluster Zone, Zhejiang Business Industrial Park
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