The world's first horseshoe shield machine is about to show its strength 

Water bridge, mountain drill holes, this is the road of common sense. Mention of drill holes, we naturally think of pangolin, the same road tunnel excavation also cannot do without the "pangolin" shield machine. You know what? China Railway Equipment Group (hereinafter referred to as "China railway equipment"), located in Henan, Zhengzhou Province, produces this weapon, and its technical level has gone abroad.

Recently, the author learned that the company produced the world's first horseshoe shield machine will appear in October 20th". "Horseshoe shaped", "the world's first", "Henan made", "completely independent intellectual property rights", affixed so many labels "pangolin"? Let's see.

Original

"Shape" horseshoe shaped global leader

In October 13th, the author saw the shield machine over 10 meters in diameter.

On the front side, it looks like a flat "big horseshoe" with a red and blue cutter head in it. According to reports, the cutter like claws, pangolin is the key part of split stone mountains, "the horseshoe shaped cutter is 10.95 meters high and 11.9 meters wide, the shield body adopts the shuttle type structure, double screw conveyor unearthed". When the work is done, the 9 cutter discs of "front and back stagger, left and right symmetry" can rotate at the same time, and can also rotate in single direction, rotate in any direction and rotate in different directions.

Compared with the traditional shield machine, the horseshoe shield machine not only is the section 'deformation', but also realizes the 'deformation' of the construction method and technology." China Railway Equipment Group General Manager Tan Shunhui said that the "big man" may seem cumbersome is very flexible, horseshoe shaped shield method was used for the first time in the railway mountain tunnel in soft soil areas, it can greatly increase the utilization rate of the space tunnel, a circular cross section to reduce 10%~15% excavation area, is the world's first new tunnel excavation mode.

It is understood that the shield machine has our own independent intellectual property rights, is the world's first horseshoe shield machine, not only for China's shield high-end equipment family added new members, but also to fill the gaps in related areas of technology.

behind

In order to meet the needs of the project, "deformation" is figured out"

It is understood that the Mongolian railway as the largest coal line in China, the tunnel design requirements large, excavation cross-section arc horseshoe shape, in order to ensure the space requirements of railway tunnels. The Baicheng tunnel of Meng Hua railway has to meet the schedule and progress, so that it has "deformation"".

Fan Lei, director of the pipe jacking Institute of China Iron and steel equipment group design and Research Institute, said that the horseshoe shaped shield machine was faced with many difficulties in the process of deformation. First of all, the market demand is small, equipment manufacturing units contact less; the second is to produce, we must build a new production line to meet the requirements; finally, it is difficult to do technology, high risk.

Cutter head is the pioneer of excavating tunnel. How to arrange the cutter head naturally becomes difficult. According to the introduction, the horseshoe shaped knife plate layout is asymmetric, which means that the excavation process will stay dead angle, this is not only dangerous, but also the difficulty of processing is also very large. The development team decided to change the location of the cutterhead and the size of the cutter head to ensure the efficiency of the excavation and the efficiency of the muck mixing. "Two designers finally came up with 10 kinds of cutter arrangement and combination scheme". "Use a few knife set? Will it deform under heavy pressure?" Fan Lei said, "these questions in his brain turns" play". After repeated demonstration, the research team decided to adopt the combination of "9 symmetrical", "symmetrical" and "left and right".

After 1 years of demonstration, research and development and production, in July 17th this year, the horseshoe shield machine was successfully off the assembly line. In October 20th, the "world first" in the Shaanxi Yulin section of Baicheng tunnel construction site appeared, and show skills.