Drainage company staff carried out the stones left by the construction to ensure smooth drainage (Photo by Meng Zhubin)
Since the beginning of this year, six major rainfalls have occurred in the main city of Kunming, resulting in 73 flood points in the main city area. Compared with the 197 flood-prone and flood-prone road sections predicted before the flood season this year, there were 124 flood-free conditions.
Kunming Drainage Facilities Management Co., Ltd. (hereinafter referred to as the drainage company) has quickly implemented rectification for 10 severely flooded water points that must be flooded every time it rains and that will be heavy. As of now, the phenomenon of flooding at these flooded water points has been obtained. Eliminate or effectively alleviate.
10个严重淹水点 Focus on improving 10 severe flooding points on 23 sections
The relevant person in charge of the drainage company introduced that the two heavy rains on June 18 and 21 this year, the maximum rainfall periods of more than 40 mm and 50 mm in one hour, respectively, have reached the level of heavy rainfall, far beyond the municipal drainage pipe network Fortification standards. Heavy rainfall of the magnitude of heavy rains has caused flooding in many sections of the main city, and some sections have serious flooding conditions.
While carrying out emergency rescue and drainage work, the drainage company also rectified the new flooded water points exposed during the rainfall this year, as well as the 10 flooded water points that will be flooded every time it rains and will be heavy immediately. .
The drainage company has rectified the 23 road sections found to be flooded due to imperfect rainwater collection systems, blocked pipelines, and bayonet jamming in some sections. For the 10 severely flooded water points formed due to real estate development, transportation construction and other reasons, the drainage company quickly implemented the remediation projects such as pipeline dredging, node reconstruction and ditch restoration. At present, the phenomenon of flooding at these flooding points has been eliminated or effectively alleviated.
Will there be no more submerged water after rectifying the submerged water point? In this regard, the relevant person in charge of the drainage company introduced that the treatment of flooded water points is not a one-time operation, because no matter what method is adopted to effectively rectify, once the rainfall exceeds its range, the flooded points that have been treated will still be flooded again. Standing water.
积水强度明显减弱 Significantly weakened water accumulation in multiple flooded areas
According to the person in charge, in the dredging and obstacle removal projects implemented for two consecutive years, the drainage company and related departments have jointly implemented the trench dredging, flood diversion, and node reconstruction projects in some areas prone to flooding. In many submerged areas, although it is necessary to flood every rain, the intensity of the submerged water each time shows a significant downward trend compared with previous years.
In the past, flooding occurred in the areas of Dashuying and the prospecting plant. The water depth was 60 to 70 cm, and the duration was at least 1 day. In several rains this year, the accumulated water depth of the flooded water in the areas of Dashuying and the prospecting plant was about 20 cm, and the natural water withdrawal time was significantly shorter than before. All the water accumulated within 2 to 3 hours.
In the past, when there was heavy rain, the submerged water in the lower layer of the Hongqiao Interchange was at least 50 cm deep, and in severe cases it was 80 cm deep. Changlong Building Material City used to be flooded in the rain, and the accumulated water was at least 30 cm. Not only are the sidewalks submerged, but the motorway will also be occupied by one third of the water.
Up to now, although flooding has occurred in the lower layer of the Hongqiao Interchange, which has been subjected to heavy rain, the depth of the accumulated water has decreased to about 30 cm compared to previous years. As soon as the rain stops, the water will automatically recede in less than an hour. In the past, Changlong Building Material City, which would be flooded with a little rain, has not experienced flooding this year.
Currently, the drainage company's emergency drainage capacity has been increased from 10,000 cubic meters / hour to 20,000 cubic meters / hour. The implementation of the new "one city, one head and one network" new drainage management model has further promoted the further development of various tasks of drainage companies. At present, for the drainage network newly taken over from each district, the drainage company has begun to carry out a health check of the network and solve them in order according to the severity of the problems found.
Yongchang area dredged 2000 meters of pipe network and ditch to alleviate submerged water
Yesterday morning, at the construction site of the dredging and obstacle removal project in Yongchang area, more than a dozen workers were removing pieces of "stones" from the drainage pipe. These "stones" are all construction waste that has been consolidated in the pipe network. The largest is four or fifty centimeters long.
During the three heavy rains in June, a large area of flooding occurred in Yongchang, with an average water depth of about 30 cm and a depth of 1.1 meters.
"The waterlogging main channel of the Yongchang area lacks systematic planning and the river channel is poorly protected. In addition, the area is low-lying, and the water from the drainage pipe network cannot be smoothly discharged into the river. The pipeline runs at high water levels throughout the year, resulting in flooded water in the area. Serious. "Yao Yuan, head of pipe network maintenance of Xishan District of Drainage Company, introduced that the surrounding land was under high-intensity development, and a large amount of construction waste and wastewater were discharged into the pipe network. A 1.2-meter-thick concrete compaction was formed in the pipeline. The silt in the pipeline left only 40 centimeters of the cross section of the original 2.4 meter deep pipeline, which seriously affected the drainage capacity.
In response, the drainage company carried out dredging and removal of barriers on the 390-meter pipe network of Huachang Road, the 556-meter pipe network of Cailian Road, the 574-meter pipe network of Yongning Road, and the 457-meter underdrain of Cailian River, and urged developers to relocate the pressurized debris. , Organize the implementation and complete the addition of 21 underground drainage canal inspection wells.
At present, detailed drainage regulations for Laoluowan Bay have been completed, and it is clear that the land developers and the government of the territories will implement the flood prevention and drainage projects in two areas, Yongchang and Laoluowan.
Seven new launch systems added to the south gate section of the South Second Ring Railway Station to increase road drainage capacity
On the section of the South Second Ring Road, about one kilometer in front of the south gate of the subway from Kunming Railway Station to the railway station, several workers are constructing and reconstructing on the non-isolated pier.
"The diameter of the drainage pipe on both sides of the isolation pier between the motorway and the auxiliary road is small, only 5 centimeters, and there are many blocked by garbage and dust." Zhang Yu, a staff member of the information technology department of the drainage company, introduced that the drainage system below the second ring system and The water outlet is usually installed on the slow lane, and the water in the fast lane cannot be drained to the slow lane at the first time.
The rainwater main river estuary in this area was blocked, and the rainwater pipes and rainwater branch pipes were severely deposited, and the degree of sedimentation was about 90%. "The rainwater supervisor dredged more than 440 meters, and cleared more than 100 square meters of construction waste. Only more than 10 centimeters of water can be passed." Zhang Yu said that before that, the rainwater outlet of the Mingtong River had been blocked. After desilting, the The flood capacity of road sections was improved.
The drainage company is also transforming 4 sets of downfall systems on the lower pavement of the second ring road, adding 7 more sets of downfall systems to increase road drainage capacity. After construction, no flooding occurred on this section.
200 meters of silt was cleared from the 70m open ditch in Shizui Station of Chunyu Road Metro Line 3
As soon as it rains, floods will appear on Chunyu Road and vehicles will not pass. At the remediation site of Shizui Station on Line 3 of Chunyu Road, the drainage company staff cleared the mud in waist-deep sewage, and blocks of concrete slabs and bags of mud were piled on the road.
After investigation by the Municipal Drainage Company, due to construction and other reasons, the flooded water in this area was severely silted and the drainage channel was damaged. It was unable to drain normally when it encountered heavy rain.
"The pipe network in this area is very severely deposited, and some drainage pipes have a cross section of only 30 to 40 cm." Guo Yonghua, the person in charge of the maintenance and improvement of the pipe network in Chunyu Road area of the drainage company, introduced the dredging and repair work of the drainage pipes around Shizui Station. The construction entered on July 10th, and some manhole covers were lifted. The water inside reached the manhole cover, and after more than 10 days of construction, it had dropped by about 80 cm.
The remediation this time mainly dredged 4030 meters of rain and sewage pipes on the east and west sides of Chunyu Road and 263 meters of Xicaigou river in the flood control channel. At present, 70 meters of dredging in the Mingcai section of Xicaicagou has been completed, and 200 square meters of silt have been removed. The rainwater pipe on the east side of Chunyu Road has dredged 200 meters, 11 inspection wells, and 220 square meters.
Guo Yonghua said that the washing vegetable ditch is 2 meters deep, but the silt is 1.5 meters. Due to the limitation of construction conditions, dredging can only be done by manual dredging. By dredging, the water level of the pipes and the washing vegetable ditch on both sides of the road is significantly reduced, which effectively relieves the submerged water.
Rainwater on the upper section of the diverting tunnel at Niujiezhuang through the Guikun Railway and the upper part of Guikun Road
The Niujiezhuang Tunnel and the 8km tunnel on the Guikun Highway are flooded every time it rains. After a rain in June this year, the deepest submerged water level in the Niujiezhuang Tunnel reached 3 meters.
Zhang Yu, the person in charge of the renovation of the area, said that the rainwater collection system on the road is not perfect, and the severe blockage of the collection system during the rainy season is one of the main causes of flooding in the area. It was seen at the scene that the ditch near the Niujiezhuang Crossing-Guizhou-Kunming Railway Tunnel was filled with thick silt and it was difficult to drain rainwater.
The Dongbaisha River, which is the main flood control channel in the area, is currently undergoing comprehensive water environment improvement. The upper reaches of the East Baisha River are two times wider than the lower reaches of the Niujiezhuang area, resulting in heavy rainfall. The river channel could not carry a large amount of incoming water upstream, and eventually poured back onto the road.
Drainage companies lay pipes and use rainwater ditches to transfer rainwater from the upper section of Niujiezhuang Tunnel and the upper section of Guikun Road to Dongbaisha River to alleviate the flooded water in this area. At present, the maintenance of the dredging of the rainwater side ditch (about 400 meters) of the Niujiezhuang through Guigui-Kunming railway tunnel has been completed, and the rainwater collecting cover side ditch 460 meters has been added. The pipeline in Zhuangxia Interchange area is about 30 meters. After the implementation of the project, no flooding occurred in the area in recent rainfall.