Development history
Sing Erlang Mountain
"Well, Erlang Mountain is so high. Old trees and weeds are all over Shan Ye, and boulders are all over the mountain; The narrow path is difficult to walk, and the traffic between Kangzang is blocked by it.
Second, Erlang Mountain, even if you are tall. The People's Liberation Army, an iron man, is determined to build a road to Tibet. Not afraid of the wind, not afraid of snowflakes floating, getting up early and going to bed late, starving, all of them are full of energy and have made great contributions to building bridges and roads.
Second, Erlang Mountain is covered with red flags. When the highway is opened, the army will be transported, the frontier will be defended, the source of happiness will be developed, and the people will enjoy the well-being. It's really a good place to hide before and after. Unlimited treasure has not been picked, and cattle and sheep are everywhere. Forests and grasslands are everywhere, and the wealth of the people cannot be plundered by invaders. To consolidate national defense, we must first build frontiers, turn tents into tall buildings and turn barren hills into pastures. If the invaders dare to invade, they will all be destroyed! "This song" Singing Erlang Mountain ",which was once popular all over China, was written at the end of 195 1. It is a battle song of officers and men who built a road into Tibet." Erlang mountain, towering into the sky "sings people's awe of Erlang mountain and their desire to cross the natural barrier and reach the outside world."
Conquer Erlang Mountain
Conquering Erlang Mountain and crossing the natural barrier has always been the dream of local people. Up to now, there are still old photos published in the People's Liberation Army Pictorial on the earth wall of houses under Erlang Mountain. According to the "Pictorial" report, the soldiers of the 18th Army of the People's Liberation Army who took part in road construction in those days wore thin cotton-padded clothes and hung them on the mountainside with ropes. One man is holding a chisel, and the other is waving a hammer. Apart from these simple tools, there is no mechanical equipment, which is far from modern mechanized road construction equipment.
It was under such difficult conditions that the officers and men of the PLA 18 Army spent four years repairing more than 2,000 kilometers of Sichuan-Tibet Highway, and at the same time paid the sacrifice of 4,963 soldiers. Over the past 50 years, Sichuan-Tibet Highway has been continuously rebuilt and maintained, from gravel roads to asphalt roads. Thousands of cars and people from Qian Qian pass through this road, and hundreds of tons of goods are continuously transported into Tibet from this road.
Single tunnel access
Nearly 60 years have passed in a blink of an eye, and this song "Singing Erlang Mountain" has not been forgotten by people because of the passage of time. There is a tunnel-Erlangshan Highway Tunnel on the Sichuan-Tibet Highway which has been merged into National Highway 3 18.
Erlangshan Highway Tunnel, with axis watershed at an altitude of 2948m, tunnel site at an altitude of 2200m, maximum buried depth of 748m, main tunnel length of 4 176m,1July 1996, lasted for 5 years and was completed in February 2006. When it was started, it was the longest mountain highway tunnel with the largest buried depth, the highest altitude and the largest ground stress in China.
After the opening of Erlang Mountain Tunnel, people no longer have to worry about the danger of crossing mountains and mountains, and they can cross the first mountain of Sichuan-Tibet line in 5 minutes. Maybe now we can't deeply appreciate the convenience brought by this tunnel, but those who have participated in the construction of Sichuan-Tibet highway will never forget those years.
Erlangshan Tunnel of Sichuan-Tibet Highway is located in Erlangshan at the junction of Ya 'an City and Luding County, Sichuan Province. It starts from the Sichuan-Tibet line in Longdanxi, tianquan county and ends at the Sichuan-Tibet Highway in Beituoshan, Luding County, with a total length of 8,596 meters. In which Erlangshan tunnel is 4176m, Beituoshan tunnel1kloc-0/m, and Heping ditch bridge118m. The road grade is a third-class highway in mountainous and hilly areas, with an entrance elevation of 2 182 meters and a total investment of 470 million yuan. It is the throat reconstruction project of Sichuan-Tibet line. Erlangshan Tunnel of Sichuan-Tibet Highway, built by China Railway Tunnel Bureau No.3 Co., Ltd., is located on National Highway 3 18. Its axis watershed elevation is 2948, the tunnel site elevation is 2200, and the maximum buried depth is 748 meters. The tunnel started in July of 1996 and was completed in February of 200 1 year. The length of the main tunnel is 4 176, which is the longest tunnel with the largest buried depth, the highest altitude, the largest in-situ stress and extremely complicated geological conditions in China. The tunnel is a straight-line tunnel, with a single hole and two-way traffic, a variable slope point in the middle, and a circular outline with a single center, with an inner contour radius of 4.83 meters, a clear width of 9 meters and a clear height of 6.85 meters. The cross slope of pavement adopts bidirectional herringbone slope with a gradient of1.5%; Set up two lanes, the road width is 7.50m, and the length of parallel pilot tunnel is 4155m, which is mainly used for ventilation and emergency passage, and is connected with the main tunnel through the 14 transverse passage; The clear width of the parallel pilot tunnel is 4.5m, the clear height is 4.5m, and the width of the single-vehicle road surface is 4.0m. The estimated design budget of the project is 489 million yuan, and the final accounts for completion are 439 million yuan, saving investment of 50 million yuan. The Erlangshan tunnel is constructed with NATM composite lining. The tunnel belongs to the extra-long tunnel with high ground stress, with the designed maximum horizontal stress of 50Mpa and the measured maximum horizontal stress of 327Mpa. Rockburst and large deformation sections account for 60% of the total length of the tunnel, and Xikou section passes through 79 shallow-buried asymmetric colluvium and underground river karst sections. The completion and opening of the tunnel not only shortened the route mileage by 25 kilometers, but also avoided the rain, fog, ice, snow, freezing, landslide, collapse and debris flow areas often encountered when climbing mountains, ending the one-way control and opening for decades and ensuring all-weather opening. The total length of Erlangshan Tunnel is 465,438+076. When it was started, it was the longest mountain highway tunnel with the deepest burial depth, the highest altitude, the largest in-situ stress and extremely complicated geological conditions in China. High ground stress test and optimization of engineering measures.
/kloc-0 was rated as "National Excellent Highway Project under Construction" by the Ministry of Communications in 1999 and "National Top Ten Excellent Highway Construction Quality Year Activities" by the Ministry of Communications in 20001year. In 2005, he won the fourth (2004) "Zhan Tianyou Civil Engineering Award".
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