Ultra-high molecular weight polyethylene escape tube material is light in weight, easy to dismantle and transport; pipeline has good toughness, high impact strength, instantaneous deformation when impacted by strong external force, absorbs a large amount of impact energy, and then quickly restores its original shape, and provides emergency escape for highway tunnel construction. The rescue provides extremely safe and reliable protection; the pipe ring has high rigidity, good pressure resistance, and is not easily deformed. When collapse occurs during construction of the road tunnel, the pressure bearing capacity and resistance to environmental damage far exceed those of the general pipeline. At the same time, the structure and dimensions of the new emergency rescue channel are ergonomic, simple in structure, and easy to disassemble and install. After impact resistance, the impact resistance test of UHMW polyethylene escape pipe and steel pipe was conducted to verify the reliability of UHMWPE pipe for emergency rescue in tunnel construction.
Ultra high molecular weight polyethylene escape tube features:
First, wear-resistant plastic crown, higher than nylon 66 (66), PTFE 4 times, 7-10 times that of carbon steel, stainless steel;
Second, impact strength ranks first among general engineering plastics, which is 20 times, twice, and five times that of PVC, and can be maintained at -196 degrees Celsius. No matter whether it is strong external impact or internal pressure fluctuation, it is difficult to make it crack. This is the characteristic that no other plastic has;
Third, the impact energy absorption value in all plastics, and has silencing;
Fourth, the coefficient of friction is low, only 0.07 ~ 0.11, it has self-lubricating properties. Under water lubrication conditions, the coefficient of dynamic friction is lower than that of 66 and POM.
Fifth, no scaling, no adhesion, so the flow resistance is very small, can maintain long-term flow and flow reduction. Its inner diameter design can be reduced by 15% compared with steel pipe;
Six, chemical stability, with excellent chemical resistance;
Seven, excellent hydrophobicity, water absorption rate of less than 0.01%, only 1%;
Eight, excellent resistance to internal pressure, resistance to environmental stress cracking, rapid cracking resistance;
Nine, health, non-toxic, accessible to food and drugs;
Ten, good weather resistance and anti-aging properties. Unsaturated groups in the ultra-high molecular weight polyethylene chain are few, and the molecular weight is large, and it has good stability in itself.
Eleven, easy to connect, easy to install;
Twelve, high economic efficiency, installation costs much lower than the traditional materials, coupled with comprehensive comparison of corrosion resistance, wear resistance, weather resistance and many other factors, the economic benefit is 4-6 times that of steel pipes.
Through the impact tests of ultra-high molecular weight polyethylene escape tubes and steel tubes with similar dimensions and specifications, the feasibility of using super-high tubes in the emergency rescue of highway tunnel collapses was demonstrated.
First, test materials:
1. Q235 spiral submerged arc welded steel pipe, specification Φ620×10. Yield strength σ1 = 215 GPa, elastic modulus E1 = 210 MPa; Poisson's ratio ν1 = 0.25.
2. Ultra high molecular weight polyethylene tunnel escape channels (molecular weight approximately 2.5 million), specification Φ800×30, yield strength σ1=3.7 GPa, elastic modulus E1=700 MPa; Poisson's ratio ν1=0.42.
Second, test requirements and methods:
Using steel pipes with similar dimensions and ultra-high molecular weight polyethylene tunnel escape pipes to free the weights from a height H of 10m from the top of the pipe, conduct impact comparison tests to verify the reliability of UHMWPE tunnel escape pipes. .
1. The impact specimen is a massive granite with a preliminary selected rock diameter of 0.67m. The values ​​of the rock mass parameters are: elastic modulus E=40 MPa; Poisson's ratio: ν1=0.2; % density Ï1=2500 kg/m3; rock weight W=400 kg.
2. The circular tube cushion is a smooth sand bag with a cushion thickness of 250mm and a width of 800mm.
The thin-walled circular tube used for escape in tunnel construction is free to be placed on a flat cushion. When subjected to rockfall impact loading, the bottom of the circular tube is mainly constrained by the vertical and lateral friction of the cushion. The distance between the impact test specimen and the top of the circular tube is mainly determined by the excavation height of the tunnel section. In this experiment, the limit value of the height from the top of the tunnel to the top of the circular tube is H 10m, and the briquette is free to release, respectively, to the ultra-high molecular weight polyethylene. Tunnel escape pipe and steel pipe impact. Experimental Results After the UHMWPE tunnel escape tunnel was impacted, the stones were ejected, the pipeline was hardly damaged, and the impact resistance was good. After the steel pipe was impacted, the pipeline was flattened and permanent deformation occurred.
Ultra High Molecular Weight Polyethylene - Tunnel Escape Pipe Applications:
1 UHMW-PE tunnel-escape pipe uses Φ800mm ultra-high molecular weight polyethylene pipe, pipe section length is 3m, wall thickness is 30mm, UHMWPE tunnel escape pipe can adopt ring type hoop connection, steel Made of lap-lock connection, U-type chain link, and clip-on connection, with 10mm connection at each end. In order to ensure that the pipeline bears the pressure of the collapsed body, the material pipe used must ensure its pressure-bearing capacity and the firmness of the joints, and can only be used in tunnels after a specific test in the laboratory.
2 The pipelines and connecting materials shall be prepared on the construction site in accordance with the surrounding rock of the tunnel and the method of excavation and excavation. In addition to the whole section of the pipeline, one-meter, two-meter and three-meter short-section pipelines and adapters shall be prepared.
3 UHMW-PE tunnels are processed and used. They are processed in combination with the material and the actual situation at the site. The connection is simple, firm, tight and reliable, and temporary fixed measures are made on the ground. The nozzles can be temporarily sealed during construction. Cover and easy to open and close.
4UHMW-PE tunnel-escape pipeline adopts φ800mm socketed UHMWPE pipe, set the starting point for the newly applied end of the two-liner, the distance from the end of the second lining shall not be more than 5 meters from the lining. The working surface is arranged in an appropriate position within 20m from the excavation surface. The UHMW-PE tunnel escape pipe is laid along the face of the primary support to the face of the hand. The work rope is reserved in the pipe to facilitate escape, rescue, and contact. And the transmission of various items, socket vertical connection of ultra-high molecular weight polyethylene pipe chain can be used to prevent the collapse of ultra-high molecular weight polyethylene pipe.
(5) UHMW-PE tunnel-escape pipelines shall be dismantled one by one during the temporary dismantling process in the process of moving the second lining trolley to the tunnel. It is forbidden to remove them in one place to ensure the effectiveness of the escape pipeline at any time.
(6) UHMW-PE tunnel-escape tunnels shall be arranged along the extended steps when passing through the step of excavation, and the 150° transit elbow shall be installed for extension. The height and length of the pipeline overhead shall not affect the construction and facilitate the opening of the escape window.
7 The UHMW-PE tunnel built should be flat, dry and smooth and should not be used for emergency escape purposes.
8 Ultrahigh molecular weight polyethylene - tunnel escape pipe laying length of 100m.
Can be root user requirements, improve the connection method, tailored to customers, to meet the different needs of users, the pursuit of excellence, daring to innovate, is the relentless pursuit of the country Run new material! Sincerely accept the opinions and suggestions of friends, and strive to make the tunnel escape pipeline R & D excellence, products by the Chinese property insurance company underwriting, a purchase, always rest assured for the tunnel construction pilot navigation!
UHMWPE tunnel escape case
China Railway 12th Bureau Group Co., Ltd. Renbo Expressway TJ16 Contract Section Project Manager | Ultra-polymer tunnel escape tunnel |
China Railway 19th Bureau Group Co., Ltd. Yungui Railway Yunnan Section Project Manager Division 2 | Tunnel construction escape emergency passage |
China Railway 12th Bureau Group Co., Ltd. Renbo Expressway TJ16 Contract Section Project Manager | Tunnel security rescue channel |
Yunnan Yunling Expressway Traffic Technology Co., Ltd. Xishuangbanna Xiaomo Line 11th Contract Section | Highway Tunnel Escape Pipeline |
Yunnan Yunling Expressway Traffic Technology Co., Ltd. Xishuangbanna Xiaomo Line Ninth Contract Section | Railway Tunnel Escape Pipeline |
Henan Yixin Steel Co., Ltd. | New Tunnel Escape Pipeline |
Kunming Zhongqiao 5th Bureau (Yunnan Yunling Highway Engineering Registered Safety Engineer Services Co., Ltd.) | Emergency tunnel escape pipe |
China Communications Fourth Highway Engineering Co., Ltd. Mengwenyu Expressway Project Manager Division II | Tunnel Construction Life Escape Pipeline |
Kunming Zhongqiao 5th Bureau (Yunnan Yunling Highway Engineering Registered Safety Engineer Services Co., Ltd.) | Tunnel construction accident escape pipe |
China Railway 14th Bureau Group Co., Ltd. Yulin Investigation and Testing Section of the fourth contract of the civil engineering construction project | Live rescue emergency escape pipe |
Yunnan Yunling Expressway Construction Group Co., Ltd. Zhenlin Expressway Project Manager | Tunnel Emergency Escape Pipeline |
CCCC Second Highway Engineering Bureau Co., Ltd. å‚ Silver Channel Project Civil Engineering 2 Standard Project Manager | Tunnel safety rescue escape pipe |
Chengdu Shuangyong Materials & Accessories Co., Ltd. | Steel tunnel escape pipe |
Yunnan Yunling Expressway Construction Group Co., Ltd. Linyi Airport Expressway Project Manager | Underpass Tunnel Escape Pipeline |
CCCC Tunnel Engineering Bureau Co., Ltd. Changwei Kezhu CGZQ-4 Standard Project Manager Division | Highway Tunnel Escape Pipeline |
Asean Construction Engineering Co., Ltd. Liuwei Expressway No. 5 Contract Section Project Manager | Ultra-polymer tunnel escape tunnel |
Yunnan Yunling Safety Technology Co., Ltd. | Emergency tunnel escape pipe |
Gansu Luqiao Construction Group Co., Ltd. G316 Lianghui Expressway Experimental Section Project Manager | Railway Tunnel Escape Pipeline |
Kunming New Railway Trade Co., Ltd. | Highway Tunnel Escape Pipeline |
Gansu Luqiao Leisure to Zhuoni Second Class Test Section Project Department | Ultra-polymer tunnel escape tunnel |
China Water Conservancy and Hydropower 7th Engineering Bureau Co., Ltd. Shuguang Expressway Project Manager | Tunnel escape route |
China Railway 19th Bureau Group Co., Ltd. Yungui Railway YGZQ-4 Standard Project Department | Ultra-polymer tunnel escape tunnel |
China Railway 12th Bureau Group Shanghai Kunming Experts Kunming Hunan Section Project Department | Emergency tunnel escape pipe |
China Railway Tunnel Administration Yungui Railway Third Division Project Department | Railway Tunnel Escape Pipeline |
The second division of the China Southern Airlines Fourth Aviation Bureau Yungui Railway Project No.1 Yungui Railway Project Department | Highway Tunnel Escape Pipeline |
Pvc Elbow,Sewage Pvc Elbow,Sewage Pvc Coupling,Sewage Pvc Plug
Zhejiang Huangyan Minghua Plastic Pipe Fitting CO.,LTD , https://www.pipefitting-mh.com