Underwater pressure Water pipe Road maintenance construction team - case
On September 12, our company personnel received a phone call from Dainan Town, Xinghua City, Jiangsu Province, and the mayor of the town wanted our company to leave the diving construction team and send them to the vicinity of the Dainan Town Waterworks. There was serious water leakage in the water pipe here. After receiving the notice, our company personnel rushed to the site in a good time, and arrived at the site, where the director of the waterworks introduced the leakage of the pipe, This pipeline connects the supply pipeline of four towns and villages, affecting 120000 draught water, so it is urgent to take a faster time. Now the waterworks has closed the water supply pipeline valve 。
The diving construction team immediately entered the working state and prepared the diving equipment. The divers went into the water for the first time to explore the condition of the underwater pipeline. The inner diameter of the pipeline was DN700mm Pe pipe The hole with 20mm wall thickness is located below the pipeline. The water pressure in the pipeline has washed a hole more than three meters wide under the riverbed. After exploring the underwater situation, the diving team immediately formulated a plugging plan. First, according to the pressure of the underwater pipeline, it was blocked with a huff festival. The factory director immediately sent someone to the manufacturer more than 100 kilometers away to customize a special huff festival, The divers took advantage of this time to clear the mud around the pipeline damage opening, so that the damage position was fully exposed, which was convenient for the installation and sealing of the Haff Festival. At more than eight o'clock at night, the sealing and removal materials were finally transported to the construction site. Our diving team carried out the underwater sealing construction overnight, and finally completed the sealing of the two leakage points in the afternoon of the next day. Water plant valve opening door Pressure test was carried out, and the plugging effect reached the expected effect. Water supply was restored to the following four villages and towns.
For a qualified diver, the following work shall be done during underwater exploration.
1、 Equipment inspection
When using internal combustion air compressor, take steps to prevent inhalation of waste gas pollution and shorten the air. The air inlet of the compressor shall not be infected by unclean gas.
When there is only one diver working underwater, one more set of equipment must be equipped on the task ship, so that once the diver is pregnant and sold, he can get into the water for first aid in real time.
Disinfection is required before diving to avoid copper rust.
Telephone transmission should be clear.
Check valve of intake pipe shall be clean, flexible and complete.
The atmosphere filter tank is clean and the pressure gauge is normal.
The ladder is firm and bumpy with proper angle.
The air pipe head is firm.
9. The messenger rope and gas pipe can withstand a tensile force of 180kg.
10. Make technical disclosure and safety disclosure to divers before launching
2、 Dressing and water entry
You can't dive after drinking.
Wear protective equipment before approval.
Those who are not deformed in health should be prevented from diving. If necessary, they can only wear clothes after being examined by the doctor.
When the air pressure of the filter tank is greater than the hydrostatic pressure of the diver at the upper level, the diver can go down the ladder to enter the water.
After getting off the ladder, use your hand to hold the ladder and slowly dive into the water. After checking for water tightness, it is approved that you can venture off the ladder.
When the surface or underwater environment endangers the safety of divers, stop diving into the water.
The diving speed is limited to 15 meters per minute.
3、 Surface cooperation
Each dive should be instructed by a specially assigned person, and all personnel should obey the edict.
Fighting and teasing are prohibited during working hours.
The messenger line gas pipe shall be held by a specially assigned person, and the rope and pipe shall not leave the hand.
Carefully monitor water area information and barometric pressure change.
Diving records shall be kept strictly and timely.
Kindness refers to the static state of divers under water.
Try to do more or reduce the underwater labor of divers.
Non mission staff are not allowed to enter the diving workboat.
4、 Diving work
The diver told the surface by phone after landing.
The ventilation rate shall be increased appropriately after the diver lands at the bottom.
Strictly abide by the surface instruction during the whole process of diving.
During the whole process of diving, if you receive a signal from the water, whether it comes from a mobile phone or a pipe line, you must respond correctly as soon as possible.
During the whole process of diving, if there is any abnormal feeling or discomfort, the water surface shall be notified in time.
When moving under muddy water, you should reach forward to protect the door mirror.
When working underwater, pay attention to the position not lower than the chest.
It is forbidden to release the messenger rope underwater.
5、 Rising and water outflow
You must tell the water surface in advance before rising, and you can only rise from the bottom after you are notified to leave the water by consent.
The water shall be discharged in strict accordance with the decompression procedure notified by the water surface.
It is strictly prohibited to hold the air when rising.
Reach out to protect the roof when approaching the water surface.
The rising speed shall not exceed 8 meters per minute.
