Several departments participated in the on-site emergency repair.
Baoshan Bridge Bus Station on Jianguo North Road, near the intersection of the stadium. This section is the bustling commercial street in Hangzhou, and there is a large residential area behind the bus stop.
Yesterday morning, just next to this bus stop, in just a few minutes, the road surface collapsed a lot. With the pungent smell, a burst of yellow smoke emerged from the collapse and rose into the sky.
The reporter learned from the relevant departments that as of 0: 00 today, the leakage of the subway communication channel has been controlled; About 1700 cubic meters of grouting was injected into the collapsed pavement of Jianguo North Road, which has been basically backfilled, and the deformation of surrounding houses has been initially controlled.
site
Yellow smoke filled the air.
Pavement collapse of Jianguo North Road
At about 11: 30 noon, the reporter from qianjiang evening news arrived at the collapse site, which is located on the south side of Baoshan Bridge Bus Station on Jianguo North Road from south to north.
The traffic police have taken two-way road closure measures from the intersection of Jianguo North Road Stadium to Fengqi Road, and all motor vehicles, non-motor vehicles and pedestrians are prohibited from entering this section.
Near the collapse, the reporter saw that there was still a small amount of yellow dust pouring out continuously, which could smell a heavy pungent smell. The asphalt road to the south of the collapse was covered with a thick layer of yellow dust.
Passers-by have left in a hurry, clutching their noses, and the police and community workers are persuading residents to leave at nearby intersections and community gates.
At this time, the collapse continues. Qianbao reporter saw that electric cars, bicycles and a tree on the sidewalk parked on the side also fell into the pit with the collapse and expansion, and the side of the bus stop tilted.
"Put out the cigarette soon." "There is a gas leak, hurry up." The staff of the gas company constantly reminded.
Zhou Lihua, secretary of Donghe Community, told the reporter that after learning about this situation at 11: 40, the community quickly took action: the staff kept reminding more than 400 households along the street with microphones and speakers to close doors and windows, not to use naked flames, and gay men not to smoke.
Due to traffic control, Xiao Yaoyi, a fourth-grade primary school student in Liangzhu, Yuhang, was so anxious that he cried on the side of the road. Because the road to the training class was blocked, he didn’t know how to detour and was going to be late for class. Every afternoon, he takes the subway from Liangzhu to Jianguo Road subway station, and then walks north to Canghe to attend the Olympic Mathematics training class, so Qianbao reporter takes him to walk around Donghe Park on the west side of Binhe Square and sends the children to the training class.
rush to deal with an emergency
Multi-department arrived at the scene for emergency rescue.
Unified appraisal of dangerous buildings in 13 buildings
After the collapse, the construction committee, emergency management bureau, traffic police, fire control, city investment, electric power and other departments arrived at the scene to participate in the joint rescue of emergency measures.
At 11: 14 noon yesterday, the gas group received an alarm. Ten minutes later, the repair personnel confirmed the collapse site. At 11: 37, the three valves of the medium-pressure main pipe and the low-pressure valve on the south side were closed on site.
At 12 o’clock noon, cement trucks drove into the scene of the accident, and the construction unit began to inject cement into the collapsed pavement.
Some staff members told Qianbao that concrete and cement will solidify after grouting, which can fill the gap below the collapse. On the one hand, prevent the collapse of a larger area; On the other hand, it is also to repair the road surface.
At about 6 o’clock in the evening, qianjiang evening news reporter saw that the road surface was almost leveled.
Yesterday afternoon, a dangerous building inspection company in Hangzhou began to conduct unified appraisal of these 13 buildings, and a dangerous building appraisal report will be issued as soon as this afternoon. Once identified as a dangerous building, according to the level, whether it needs reinforcement or demolition and reconstruction, it will be handled in strict accordance with the requirements. As for the news that a house around the scene of the online accident has been identified as a dangerous building, it was confirmed as false news after verification.
In addition, Qianbao reporter also learned that the accident has no impact on the subway lines already in operation, but the construction period of Line 5 under construction will be affected a little, depending on the rescue progress.
cause
Leakage occurred during subway construction.
Causing the road surface to collapse with gas leakage
At 2 o’clock yesterday afternoon, Hangzhou Metro Group held a brief news briefing.
Zhao Yi, Deputy General Manager of Metro Group, introduced — —
At about 10: 00 a.m. on August 28th, water leakage occurred in the construction of the communication passage between Baoshan Bridge Station and Jianguo North Road Station of Metro Line 5, which led to the pavement collapse of Jianguo North Road (Tiyuchang Road-Fengqi Road Section), accompanied by some gas leakage. City Metro Group immediately organized emergency rescue and closed the roads and personnel of Jianguo North Road (Tiyuchang Road-Fengqi Road Section). The incident did not cause any casualties.
After the incident, Dai Jianping, member of the Standing Committee of Hangzhou Municipal Committee and executive deputy mayor, and Miao Chengchao, deputy mayor, immediately rushed to the scene to direct the rescue, start the emergency plan, and organize joint rescue. The Xiacheng District Party Committee and District Government, the Municipal Construction Committee, the Emergency Management Bureau, the traffic police, the fire department, the city investment department, the electric power department and other departments arrived at the scene to take emergency measures for joint rescue.
In order to ensure the safety of the surrounding people and buildings, the relevant departments evacuated the relevant residents of Shuyuan Community around the collapsed road surface for the first time. The Municipal Metro Group has strengthened the monitoring of surrounding buildings and arranged a comprehensive investigation of the safety of surrounding communities and underground pipelines. Accident rescue is being carried out in an orderly manner.
Qianbao reporter learned from an insider that the most direct cause of the accident was the leakage of the communication passage under construction, and the soil layer above the communication passage lost, which led to the collapse of the road surface.
The so-called "communication channel" is a channel set between two subway tunnels. If there is a problem in one tunnel as a whole, pedestrians can move to another tunnel through the connecting passage, and the safety factor will be greatly increased, so it is also called "escape passage".
Because the communication channel is connected with the track area (subway tunnel), the leakage water enters the subway tunnel of Line 5 (near the Shuyuan community) from the communication channel. After the incident, the Metro Group took emergency measures to temporarily block the water accumulation area in the tunnel and build a protective wall with cement to prevent water from flowing to Jianguo North Road Station on Line 5 under construction.
As for why the communication channel leaks water, the specific reasons are still under investigation.
Why is the smoke at the scene yellow?
It was windy at noon yesterday, and I could smell the thick smell of "rotten eggs" far away from the collapse.
Hangzhou Gas Group told Qianbao reporter that citizens need not worry about this. The main component of natural gas is methane, which is non-toxic and harmless. Because natural gas itself is colorless and odorless, once it leaks, it can easily lead to accidents, so "odor", a vigilance agent called tetrahydrothiophene, is added to natural gas. Once it is leaked, ordinary people can detect it as soon as they smell it, which can improve their vigilance.
In addition to the bad smell, yellow smoke billowed at the scene of yesterday’s incident. Hangzhou Gas Group explained: "Due to the leakage of the gas medium pressure pipe, the leaked airflow brought up the yellow sand and dust inclusions in the soil layer, resulting in yellow smoke." (Reporter Bai Jianbin Duan Luo Jun Huang Weifen Yang Yifan Chen Yukai Shi Wenwen/photo)
