**DN800 Escape Pipe - Tunnel Escape Pipe Price** In tunnel construction, collapses frequently occur, making construction safety a serious issue. According to preliminary statistics from tunnel construction accident data from 2006 to 2012, there have been 39 tunnel construction accidents (both highway and railway) in our country. Among the highway tunnel construction accidents, collapse incidents account for 54%, making them the primary type of accident; they are the number one enemy in highway tunnel construction. Their high frequency and danger severely threaten engineering safety and can cause significant losses to the lives and property of the nation and its people. In response to the frequent collapses during highway tunnel construction, Luoyang Guorun New Material Technology Co., Ltd. has adopted a new material for the first time - ultra-high molecular weight tunnel escape pipes. The company possesses core technology, extensive experience, and advanced products in the field of ultra-high molecular weight polyethylene pipe single-screw extrusion. It has 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 pipes have been widely used in various metallurgical, mining, electric power, coal, and chemical enterprises in China for many years and have received broad recognition. Why set up escape pipes? With the continuous initiation and construction of railway, highway, subway, hydropower, and other projects in our country, underground projects such as tunnels and underground plants are emerging widely. Due to the concealment of underground projects and the complexity of geological conditions, ensuring the safety and quality of construction for tunnels and other underground projects is a daunting task we currently face. Manager Sun (136-9888-7149) Our company's new escape pipe specifications are φ800×30mm, with each section measuring 3 meters in length and weighing 69.7 jin per meter (the steel pipe weighs 210 kg per meter). **Reliability Verification** 1. **Escape Pipe Structural Dimension Design** Based on the research results of human measurement by American expert Alvin R. Tilly, it is known that the comfortable crawling height for humans is 725mm when moving by crawling. Alvin R. Tilly pointed out that when crawling through a circular opening that allows full body entry and exit, the small diameter of the round pipe must be ≥585mm to ensure normal passage. 2. **Tunnel Escape Pipe Thickness Design** Thin-walled circular pipes, when subjected to lateral impact from large energy blocks from the tunnel ceiling, exhibit minimal overall bending deformation in the lower part of the structure, with deformation primarily concentrated at the impact point. When the drop height h = 7m and wall thickness H = 24mm, the deformation value of the tunnel escape pipe is Δ = 0.048m, which is about 8% of the pipe diameter. When the drop height h = 5m and wall thickness H = 24mm, the deformation value is Δ = 0.038m, which is even smaller. At this time, after deformation, the internal passage space of the tunnel escape pipe is 740mm, meeting ergonomic requirements, allowing safe passage for individuals through the emergency channel. When the wall thickness is small, the deformation value increases, potentially posing a safety risk. When the wall thickness is larger, safety increases but so does the pipe's weight, raising costs and making handling difficult. Thus, a wall thickness of 30mm for the tunnel escape pipe is deemed appropriate. 3. **Escape Pipe Reliability Validation** Material 1: Q235 spiral seam submerged arc welded steel pipe, specifications Φ620×10. Yield strength σ1 = 215GPa, elastic modulus E1 = 210MPa; Poisson's ratio ν1 = 0.25. Material 2: Tunnel escape pipe (molecular weight approximately 2.5 million), specifications Φ800×30mm, yield strength σ1 = 3.7GPa, elastic modulus E1 = 700MPa; Poisson's ratio ν1 = 0.42. The thin-walled circular pipe used for tunnel escape is freely placed on a flat cushion layer. When subjected to impact loads from falling rocks, the bottom of the pipe is primarily constrained by vertical and lateral friction from the cushion layer. The distance from the top of the pipe to the impact test specimen mainly depends on the excavation height of the tunnel cross-section. This experiment takes the maximum height H from the center of the tunnel to the top of the pipe as 10m, releasing the rocks freely to impact both the tunnel escape pipe and the steel pipe. Experimental results show that after being impacted, the rocks are ejected from the tunnel escape pipe, which sustains almost no damage, demonstrating good impact resistance; the steel pipe, however, becomes flattened and deformed upon impact. **Certification Conclusion:** The ultra-high molecular weight escape pipes are lightweight, making installation and transportation convenient; they possess good toughness and high impact strength. When subjected to strong external impacts, they instantaneously deform, absorbing a large amount of impact energy, and then rapidly return to their original shape, providing extremely reliable protection for emergency rescue in highway tunnel construction. The pipes have high ring stiffness, good pressure resistance, and are not easily deformed. In the event of a collapse during highway tunnel construction, their load-bearing and environmental resistance capabilities far exceed those of ordinary pipes, including steel pipes. Luoyang Guorun New Material Technology Co., Ltd. welcomes you to visit our factory! The company primarily operates ultra-high pipes; mining pipes; tailings pipes; desulfurization pipes; wear-resistant rubber-lined steel pipes; rubber-lined steel pipes; anti-corrosion rubber-lined steel pipes; wear-resistant pipes; ultra-high molecular weight polyethylene wear-resistant pipes; Henan Luoyang rubber-lined pipes; ultra-high molecular weight polyethylene pipes; wear-resistant slurry pipes; rubber-lined wear-resistant pipes; anti-corrosion plastic-lined pipes; sand suction pipes. **Sales Responsible Person:** Manager Sun (136-9888-7149) 185-3886-9025, 0379-6522-7507. **Factory Address:** China. Luoyang Airport Industrial Gathering Area. Zhejiang Business Industrial Park.