800 Tunnel Escape Pipe Image
Tunnel Escape Pipeline Safety Implementation Guidelines:
1. Before tunnel construction, appropriate security measures must be in place, especially the provision of escape pipelines, which are essential to protect our workers from harm in critical situations.
2. Tunnel engineering construction must implement a work time limit system, and operations on high-risk projects must cease at night.
3. In terms of supports for tunnel escape pipelines, construction units must strictly manage the construction procedures for tunnel supports, and support delays and excessive safety spacing are strictly prohibited.
4. Where conditions allow, promote mechanized operations to reduce the number of workers. For escape pipelines over1km, entrances and exits for personnel and vehicles in tunnels under1km must also be managed according to regulations, and unauthorized personnel are strictly prohibited from entering.
5. For tunnels, a specialized safety construction plan must be developed, a tunnel safety team must be established, and adequate safety personnel must be equipped.
6. The construction unit shall formulate emergency rescue plans as required, establish emergency rescue teams, equip emergency rescue personnel, and regularly organize emergency escape drills.
The material of the escape pipeline used in tunnels is very important. What kind of material is better to choose?
Verify the reliability of the escape pipe through the following4basic methods Manager Sun （136-9888-7149）
1.Design of the escape pipeline structural dimensions
According to the research findings of the American expert Alvin R. Tilly, a pioneer in anthropometry, the comfortable crawling height for a person when moving by crawling is725mm. Alvin R. Tilly pointed out that when crawling through circular openings for full-body entry and exit, the small diameter of the circular pipe must be585mm. Therefore, the inner diameter of the new emergency rescue passage in road tunnel construction must be≥585mm to ensure normal passage for the human body.
2.Design of the escape pipeline wall thickness
During the lateral impact of large energy blocks from the tunnel ceiling on thin-walled circular pipes, the overall bending deformation of the lower part of the structure is small, and the deformation is mainly a local dent at the impact point. When the drop height of the block stone is h＝7m, and the wall thickness H＝24mm, the deformation value of the escape pipeline isΔ＝0.048m, which is about8% of the pipe diameter; when the drop height h＝5m, and the wall thickness H＝24mm, the deformation value Δ＝0.038m, which is even smaller. At this time, after deformation and denting of the escape pipeline, the passage space inside the pipe is740mm, meeting the ergonomic requirements, allowing safe passage through the emergency channel. 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 of30mm is deemed suitable for the escape pipeline design.
3.Verification of escape pipeline reliability
Material 1、Q235 spiral seam submerged arc welded steel pipe, specifications ofΦ620×10. Yield strengthσ1=215GPa, elastic modulusE1=210MPa; Poisson's ratioν1=0.25.
Material 2、Tunnel escape pipeline (molecular weight approximately250 million), specifications ofΦ800×30mm, yield strengthσ1=3.7GPa, elastic modulusE1=700MPa; Poisson's ratioν1=0.42.
The thin-walled circular pipe used for tunnel escape is freely placed on a smooth cushion layer, and when subjected to impact loads from falling rocks, the bottom of the circular pipe is mainly constrained by the vertical and lateral friction of 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, and this experiment takes the maximum height H from the center top of the tunnel to the top of the circular pipe as10m, and releases the block stone freely to impact both the tunnel escape pipeline and the steel pipe. The experimental results show that after being impacted, the escape pipeline ejects the stone, and the pipeline suffers almost no damage, demonstrating good impact resistance; while the steel pipe is flattened and deformed upon impact.
Certification Conclusion:
Due to the lightweight nature of the ultra-high molecular escape pipeline, it is easy to disassemble and transport; the pipeline has good toughness and high impact strength, which allows it to deform instantly under strong external impact, absorbing a large amount of impact energy, and then quickly restoring its original shape, providing extremely safe assurance for emergency rescue in road tunnel construction; the pipeline has high ring stiffness, good pressure resistance, and is not easily deformed. When a collapse occurs during road tunnel construction, its bearing capacity and resistance to environmental damage far exceed those of ordinary pipelines, including steel pipes.
Excellence of the New Escape Pipeline:
1. Lightweight, only about1/3 the weight of steel pipes, easy to disassemble and transport.
2. The pipeline has good toughness and high impact strength, deforms instantly under strong external impact, absorbs a large amount of impact energy, and quickly restores its original shape, providing extremely safe assurance 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 bearing capacity and resistance to environmental damage far exceed those of ordinary pipelines.
Luoyang Guorun, as a professional manufacturer of ultra-high molecular weight polyethylene pipes, places great importance on safety in tunnel construction. Therefore, it has united elites from multiple company departments and communicated and discussed with several tunnel construction parties. After six months, it finally overcame various technical difficulties, successfully producing ultra-high molecular escape pipes that can withstand high-altitude impacts from large rocks. The company is located in the Luoyang Airport Industry Cluster Area on Entrepreneurship Avenue, covering an area of over200 acres, with a workshop area of20000 square meters. In 2014, it established a joint R&D center for ultra-high molecular materials in cooperation with the Shanghai Chemical Research Institute. Subsequently, it established strategic cooperation relationships with many domestic research institutions such as the Dawn Chemical Research Institute and Hunan Nonferrous Metals Research Institute, and is now a pilot base for the Shanghai Chemical Research Institute.
The company has core technology and rich experience in the field of ultra-high molecular weight polyethylene pipes, having obtained2 invention patents and13 utility model patents. "Professional and focused" has always been the goal pursued by Guorun people. Ultra-high molecular weight polyethylene pipes have been widely used in major metallurgical, mining, electric power, coal, chemical enterprises in the country for many years and have been widely recognized.
Luoyang Guorun New Materials Technology Co., Ltd. welcomes you to visit and inspect our factory!
Sales Manager: Manager Sun （136-9888-7149）
Factory Address: China.Luoyang Airport Industry Cluster Area.Within Zhejiang Business Industrial Park
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