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We will allow the eastern branch of the West Second Line to bring benefits to all households at full speed at an early date

We will allow the eastern branch of the West Second Line to bring benefits to all households at full speed at an early date

(Summary description)After 22 days of struggle,at 16:00 on November 25,the last pipe mouth of jinjiang tunnel under the river bottom of the East section of the West Second Line was welded.At 18:30,all 535 meters of pipelines were completed,and the tunnel project under the river was successful.

We will allow the eastern branch of the West Second Line to bring benefits to all households at full speed at an early date

(Summary description)After 22 days of struggle,at 16:00 on November 25,the last pipe mouth of jinjiang tunnel under the river bottom of the East section of the West Second Line was welded.At 18:30,all 535 meters of pipelines were completed,and the tunnel project under the river was successful.

Information
Jinjiang crossing:The tunnel under the river was successfully completed
After 22 days of struggle,at 16:00 on November 25,the last pipe mouth of jinjiang tunnel under the river bottom of the East section of the West Second Line was welded.At 18:30,all 535 meters of pipelines were completed,and the tunnel project under the river was successful.
Jinjiang crossing project is located in Gao'an City jiangxi Province.It is one of the control projects of the west second line pipeline project.Due to the small cross section of pipe jacking through the tunnel and the limited operating space at the bottom of the well,it is difficult to install the pipe with a diameter of 1219mm.The project department of Pipeline Company iv works closely with the project Department of China Railway 16th Bureau to complete the supervisor's crossing by adopting forward traction method.
Due to the tight schedule,the project department of Pipeline Company iv will arrange two construction units to carry out uninterrupted construction day and night,and will start to install S-type return pipe in the original well and the receiving well.
Qiantang River shield:pipeline pressure test has been completed
On Nov.24,the pressure test and deep water sweeping operation of the Qiantang River shield tunneling project,a controlling project of Shanghai branch of the Second West-east Natural gas pipeline,was completed.
The total length of the Qiantang River shield tunneling project of the west second line is 2900 meters.The designed pipe pressure is 10 mpa and the pipe diameter is 1016 mm.This project is the longest small section and long distance shield tunnel in China.
In order to solve the communication blind spot problem existing in the tunnel,the scientific researchers of the pipeline Bureau carried out technical research,systematically solved the problems existing in the wireless communication inside and outside the shield tunnel,and made rectification item by item.After nearly a month of field installation and commissioning,the shield tunnel internal and external wireless communication project was successfully tested in the Qiantang River shield tunnel,filling the gap in the field of shield tunnel wireless communication in the pipeline bureau.This is China's first successful implementation of small section,long distance pipeline shield tunnel wireless communication project.
During the construction of the project,due to the narrow space in the tunnel,large equipment could not enter,the Qiantang River Shield tunneling Project Department constantly innovated the technology,transformed the equipment,and solved one problem after another.The staff overcame the damp,hot and other difficulties in the tunnel,carefully organized,reasonable allocation,reorganized the original construction team,the implementation of uninterrupted construction throughout the day,improve the work efficiency.(Correspondent Song Yang)
Nanning Branch Trunk line:Air Dragon walking through"Quicksand swamp"
Before we reached the construction site of nanning branch trunk project of Pipeline 5 Company,the reporter heard that the pipeline construction of Zhaoqing in Guangdong and Wuzhou in Guangxi was extremely difficult.In early November,the reporter braving the continuous rain,along the pipe here.
Nanning branch line along the area more people less land,land gold.The second,third and fourth bid sections of Nanning Branch trunk line contracted by Pipeline 5 company pass through Zhaoqing,Guangdong and Wuzhou,Guangxi,with a total length of 289.5 km.The construction area is mainly hilly,low mountain,hilly valley and intermountain plain,and the rivers,fish ponds and paddy fields are cross-distributed along the line.In only 170 meters long work belt,involving more than 30 households farming.
In the middle of April this year,as soon as the Nanning Branch line project began to work,the staff of the Nanning Branch Line project department of the pipeline Five company fell into trouble.
Local complex geological conditions are a major problem facing the construction.Project staff said,this is never encountered in any construction.
The mountain valleys are geologically harsh and the construction work is narrow,and under 200 to 300 millimeters of humus there is bottomless quicksand,like a swamp.In general,not to mention heavy equipment,is that people get trapped,will"struggle deeper and deeper."The four welding units that entered nanning branch first had the experience of equipment sinking into quicksand.An excavator built in conjunction with CPP519 could be swallowed by a quicksand swamp,even with steel sheets.The project department spent 7 days trying every means to rescue the equipment.
Heavy rains and high temperatures in the area have also made construction difficult.The region has a tropical monsoon climate,with a long rainy season and at least one heavy rain every day from April to September.Plain section in case of water flooded,mountain construction is more difficult.
Faced with many difficulties,the project department carried out technical research.In view of the special geological conditions such as paddy fields and marshes,the project department invested 620 steel plate pads 16 mm thick to ensure equipment passage.Local rain,the project department will take advantage of the rain hours construction.The local temperature is high,humid and sultry,the construction unit will arrive at the construction site at 4 o'clock every day,rest at noon,avoid the high temperature period,and then work from 3 o'clock in the afternoon to 9 o'clock in the evening.
In the construction line,the reporter felt the harsh construction environment.After a heavy rain,the temperature shot up to 40 degrees Celsius.Even standing still in a damp work belt,employees'work clothes can be soaked with sweat.After two hours of work,the workers take off their boots and pour water out.Employees say it's sweat flowing down the body into the boots.In order to cope with the high temperature operation,the project department has equipped the unit with a large capacity freezer to ensure that the crew can drink ice water and mung bean soup every day.Meanwhile,the project department provides the staff with medicine to prevent heat and cool down,and provides each employee with an extra set of work clothes for timely replacement.
It is under such difficult conditions that all the staff of nanning Branch trunk Project Department of pipeline 5 company overcame difficulties and advanced the project smoothly with the spirit of"ants gnawing at bones".

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