At present, only 1889 meters remain to be opened.
Soon after the No.
Baiyunshan tunnel, with a length of 13.3 kilometers, is the longest tunnel in the whole line of Chengdu Ziyi high-speed railway and the only super long tunnel with high gas in the whole line.
According to the requirements for entering the high gas tunnel, after completing the inspection of the belongings, put on the safety helmet, we boarded an Iveco that can seat more than 10 people and drove to the tunnel.
The roar of transport vehicles and welding sound were intertwined and resounded through the tunnel.
We have to monitor the hot work.” After arriving at the bottom of the trolley, Zhao Deyu told reporters that the gas monitoring in the tunnel has 24-hour automatic monitoring and manual monitoring.
“Although the cave is only 1.1 kilometers away, I haven’t rested my feet in the eight hours on duty.” It is proved in advance that the geological science organizes the construction, and the construction progress is reported every day.
In front of him was the working face divided into two steps.
“When necessary, we should add people and equipment, enhance factor guarantee, and exchange time for space!” Zhao Kai said.
“The slag has just been removed, and now the frame is being erected for initial support.” Chen Rongwei, the leader of the shelf team of No.
It is a high-risk tunnel with double superposition of “gas disaster” and “flood disaster”.
On the top of the trolley, under the guidance of technicians, the connecting bars are spliced and formed, the welder starts to work, and the sparks roll down from a high place, which is particularly beautiful.
Zhao Deyu, a tile inspector in red uniform, stood nearby, monitoring and recording the value of abnormal gas.
4 inclined shaft of Baiyunshan tunnel of Chengdu Ziyi high speed railway.
As soon as they arrived outside the No.
The manual monitoring is “three shifts” by three people, and he has to carry out four normalized tests in eight hours on duty.
The detection points should not only walk back and forth, but also up and down – methane at the top and carbon dioxide at the bottom.
It takes more than half an hour for workers to walk to the operation point.
“This is a high gas tunnel.
4 inclined shaft construction site, the faint sound of construction came from the entrance.
When we entered the main tunnel, the construction noise became louder, and a slag truck passed us by.
Nearly 10 workers stood at different parts of the trolley and spliced the arch.
It takes only a few minutes by car to transport by vehicle, which not only provides convenience for workers, but also ensures the connection of various processes.
On that day, the construction personnel are mainly focusing on the working face connected with No.
The Chengdu Ziyi high-speed railway will be completed by the end of 2023.
The completion of the six processes is a cycle.
How to ensure? “The most important thing is to do a good job of advanced geological prediction, explore the surrounding rock in front, and then guide the follow-up construction.” Shen Huitao, executive deputy commander of the headquarters of China Railway 12th Bureau, introduced that the project adopts a variety of advanced geological prediction methods such as advanced horizontal drilling and transient electromagnetic method, which can detect the geological conditions 30 meters in advance and then formulate the specific construction scheme..
“Baiyunshan tunnel is divided into 6 working areas and 13 working faces.
This Iveco is a transport vehicle for construction personnel on the construction site.
The rock wall between the working areas of No.
4 inclined shaft is the thickest.” Zhao Kai, the safety director of the headquarters of China Railway 12th Bureau, which undertook the construction of Baiyun Mountain tunnel, said that in order to ensure the realization of the goal of “connection by the end of June”, nearly 200 people in the two work areas are working in full cycle for 24 hours, and the thickest rock wall is thinning at a rate of 8 meters per day.
3 and No.
Chuanguan news reporter Wang Meiling / Wen Wufeng / pictures and videos “boom ~ ~” and “CICI ~ ~” on the afternoon of February 7, they came to the construction site of the main tunnel from the No.
The data of each point is recorded by selecting the maximum value after three times of detection.
In front of the palm was a four story trolley.
They passed through a number of villages and towns with lanterns and decorations, and the festive aftertaste did not dissipate.
From January 22 to February 7, the rock wall at the thickest part changed from more than 700 meters to more than 600 meters.
After the excavation reaches a certain progress, the secondary lining operation and secondary support will be carried out.
Although the construction continues and the progress is not reduced, the builders dare not take it lightly.
4 inclined shaft of Baiyun Mountain tunnel is located for 24 hours.
“We can almost complete a cycle in 24 hours and dig 4 meters.” While talking, an excavator came with arc-shaped connecting bars, and several workers came forward to lift the connecting bars and place them at the bottom of the trolley.
The reverse arrangement time is that the Baiyun Mountain tunnel must be connected before the end of June, and uncontrollable factors such as gas, goaf and water gushing are the sword of Damocles hanging over the head of “ensuring the construction period”.
Before the festival, the staff at other points with faster progress can ask for leave, but the construction personnel in the two work areas took the initiative to stay in a large area and fight on both sides.
After the last process is completed, the next process will be carried out immediately.
Chen Rongwei introduced that in order to speed up the progress, the initial support realizes the full cycle construction, that is, all workers work in the assembly line.
At the initial stage of tunnel excavation, there are six processes: excavation, drilling, blasting, slag removal, erection and shotcreting.
4 inclined shaft work area.
3 and No.
4 inclined shafts entered the tunnel, they encountered a higher concentration of gas and a wider range of goaf than other work areas.
Workers of various types of work worked in an assembly line and drove to Taihe village, Xinqiao Town, Zizhong County, Neijiang City, where the No.
This year, the construction of Baiyun Mountain tunnel has entered a critical stage.
The tunnel area has vertical and horizontal gullies, dense reservoirs and complex coal seam goaf.
On the right side of the cave top, the wind belt with a diameter of 1.8m is bulging, and the wind is pouring in.
He stepped up the steps and walked across the stone road.
After passing through the smoke and dust, Iveco stopped.
There are two working faces in No.
3 inclined shaft work area and in the direction of Chengdu.
This is the first day of work after the Spring Festival, but the construction “Symphony” here has been playing continuously since its construction, and has not stopped during the Spring Festival.
4 work area, who inspected under the trolley, said.
“One vehicle can sit in one team, and there are three vehicles in each work area.” Zhao Kai introduced that the distance from the inclined shaft entrance to the excavation face is only 1.5km.
As the longest high gas tunnel in the whole line, Baiyunshan tunnel, which passes through Zizhong and Weiyuan counties of Neijiang City, is the key control project of Chengdu Ziyi high-speed railway.
Due to the old coal mines and incomplete data, they can only be continuously detected and constructed in the construction, which also led to the progress of these two work areas, which lags behind other work areas.
