I sewage Water pipe Road plugging service - introduction to diving operation plugging municipal pipeline service:

Underwater plugging pipelines are mainly used in construction projects such as the connection of new and old municipal pipelines, the excavation and maintenance of damaged pipelines. At present, China's urban construction is progressing at a fast pace. More and more new roads and residential areas are being built in cities. Supporting measures for water supply and drainage lead to more and more businesses requiring underwater plugging on municipal pipelines, The water depth of the normal pipeline inspection well is more than 2-3 meters. At this time, the pipeline needs to be plugged by diving,

2、 Introduction to plugging methods:

According to the length of time used for blocking, it can be divided into the following three ways:

1. Air bag plugging

Use scenario: short-term plugging. Generally, the high level of the inspection well within 3 days of plugging does not exceed 5 meters. We adopt the air bag plugging construction method. The air bag plugging construction is a bit fast. After installing the air bag, we can pump water,

1) Check whether the surface of the airbag is clean, whether there is dirt attached, and whether it is intact. Fill a small amount of air to check whether the accessories and the airbag have air leaks. Only when it is confirmed that it is normal can it enter the pipe head for plugging operation
2) Inspection of pipeline: before plugging, check whether the inner wall of the pipeline is flat and smooth, and whether there is any protruding burr, glaze, gravel Such sharp objects, if any, shall be immediately cleaned and straightened to avoid irritating the air stream. After the air is put into the pipeline, it shall be placed horizontally and not twisted to avoid trapping the air and exploding the air bag.
3) . Check the connection and air leakage of the air bag accessories: Shoujin connects the water blocking air bag of the walrus tunnel with the air inflation accessories. After the connection is completed, use tools to check whether there is a leak. Extend the water blocking air bag of the pipeline, use the accessories to connect the air inflation, and allow the air inflation until it is basically full, Pressure gauge When the pointer reaches 003MPA, close the air stop valve, apply soapy water evenly on the surface of the air bag, and observe whether there is air leakage. Discharge the air in the water blocking air bag of the connected pipe, roll it vertically, and put it into the inspection port. After reaching the position of * * *, the air bag can be inflated through the leather tube to the specified service pressure. When inflating, keep the pressure in the airbag uniform, and inflate slowly. Check whether the pressure gauge rises or not. If the pressure gauge rises rapidly, it means that the inflation is too fast. At this time, slow down the inflation speed, and tighten the air stop slightly to reduce the air intake degree. Otherwise, if the speed is too fast and the pressure is exceeded rapidly, the airbag may be exploded

2. Underwater wall blocking:

Use scenario: Generally, we use underwater wall masonry for long-term plugging. The operation time of underwater wall masonry is longer than that of air bag plugging, and the process is more complicated. The advantages of underwater wall masonry are that the strength of the wall after solidification is large, and it can resist the pressure of deep water.

Divers enter the well bottom to check the well bottom → Diving auxiliary workers lift bricks into the well bottom → cement Once the mature materials are mixed, the clinker is hoisted into the well bottom → the diver builds the wall underwater → after the completion of the wall building, check whether there is any leakage point → pump water for acceptance.
1) The diver wears KM28 light diving and goes down into the well through the air compressor air supply equipment to block the pipeline with bricks. Among them, two diving signalmen are at the wellhead to observe the diving operators in the well, and the contact person is responsible for observing the movement of the diving constructors at the wellhead at any time.
2) Before construction, the whole upstream and downstream sewage pipelines shall be thoroughly understood, and attention shall be paid to the difference of water level. For safe construction, if the water level difference between upstream and downstream of the plugging hole is large, a 1m long iron fence is installed at the downstream pipe mouth to prevent the divers from being washed away by the torrent. Then the divers use bricks and cement mixed mortar to build a wall with a width of 49cm at the bottom of the pipe until the height is half of the pipe diameter, and then change it to a wall with a width of 37cm, When the masonry reaches 2/3 of the height, the wall will be changed to 24cm wide. If the water flow is rapid, the masonry will not be finished in a hurry. A hole of 20cm to 30cm will be left in the upper part of the zui of the wall to let the water flow through, and the wall will solidify for 12 hours. The next day, the water shall be lowered again for masonry, and the diversion pipe shall be installed, and the pressure reducing valve shall be installed on the diversion pipe.
3) After the plugging is completed, use a shovel to clean the bricks and cement slurry into a cloth bag, pull them to the wellhead, and the operators above will pick them up and load them away.
4) Engineering personnel with rich construction experience and engineering equipment with good performance are put into this construction operation.
5) Keep safety in mind during operation, carry out safety training every day, and operators sign in
6) Cement and rapid setting agent shall be mixed in proportion to ensure their underwater performance.
7) After the construction of the board, the water worker shall carefully check the leakage point. If there is water pressure, the leakage shall be stopped with quick solidification materials after the wall is solidified.

3. Steel plate underwater plugging:

Usage scenario: when the water flow meter in the drainage pipeline is more than 5m deep, we use the steel plate plugging method

1. First, the diver goes into the inspection well to measure the pipe size and ensure that the position where the steel plate is installed is free of obstacles.

2. According to the pipe size, U-shaped channel steel is used to cut into a circle, which is 5cm wider than the pipe mouth. As shown in the figure

3. The diver shall assemble the blocking steel plate in the underground installation sequence, each steel plate shall be connected with screws, and then close the diversion valve, and then cover it with cotton cloth and plastic film.

3、 Our company's advantages.

1. The underwater plugging construction team of our company is all teachers with hundreds of plugging experiences, who have rich underwater plugging experience and can serve underwater plugging environments with various difficulties.

2. Diving is a high-risk occupation, and what we are engaged in is also diving engineering. And it has always been and will be. There are many elements that constitute diving risks. Finding out the risk source is conducive to reducing or avoiding risks, thus improving life safety and laying a solid foundation for the company's development.

3. Underwater operation is a kind of work with high technical content, and the visibility in turbid water is zero. To complete the plugging task in this environment, the requirements for divers are quite high. At the end of each dive, the safety officer should check and repair the equipment to ensure that the equipment is in good condition. Before diving, the diver should check the equipment again in person to ensure that it is correct before diving.

4、 Project example:

1. The sewage well dn1500 in Xinhua Road, Tongzhou District, Beijing was blocked with a depth of 5.5 meters. [Excellent project]
2. The underwater pipeline of sewage well dn1200 in Hengda Shanshui City, Wuqing District, Tianjin City is blocked with a depth of 4.2 meters. [Excellent project]
3. The sewage well dn800 at Renmin Middle Road, Cixian County, Handan City, Hebei Province, has been blocked with the underwater pipeline at a depth of 3.6 meters. [Excellent project]
4. Sewage well dn1350 in West Lake District of Hangzhou City is blocked with underwater pipeline and water depth of 8m. [Excellent project]
5. The sewage well dn1800 in the south ring road of Zhengzhou City has been blocked with a water depth of 3.7m. [Excellent project]
6. The sewage well dn1500 underwater pipeline of Nanchang University Town is blocked, and the water depth is 5.6m. [Excellent project]
7. The sewage well dn2000 of Xi'an Logistics Avenue is blocked with a water depth of 4.3 meters. [Excellent project]
8. Zhengzhou sewage well dn1200 underwater pipeline is blocked, and the water depth is 6.5m. [Excellent project]
9. Qingdao Jiaozhou sewage well dn600 underwater pipeline is blocked, and the water depth is 2.8m. [Excellent project]
10. Underwater plugging of dn1800 sewage pipeline in Fangshan District, Beijing, with water depth of 3.6m [excellent project]
11. Tangshan dn800 sewage pipeline underwater plugging, water depth 3.5m [excellent project]
12. Underwater plugging of dn1000 sewage pipeline at Zhanqian Road of Xuzhou High speed Railway Station with water depth of 6m [excellent project]
13. Underwater plugging of dn1350 sewage pipeline in Langfang Development Zone with water depth of 4.8m [excellent project]

5、 Construction safety responsibility:

Diving is a high-risk industry. The personnel of Yancheng Hengrui Underwater Engineering Co., Ltd. all work with certificates. The company has purchased accident insurance for all employees. Our company is responsible for the safety of our construction personnel. Therefore, our company has formulated strict safety rules and regulations:

Focus on diving safety:
1. The ventilated heavy diving operation group shall be composed of four persons for each group of diving operation, and shall be equipped with a full set of emergency diving equipment and rescue divers; The double group diving operation can be composed of eight people, but not less than seven people. Diving operation outside the base must be capable of diving in two groups at the same time.
2. Divers, line operators, telephone operators, and diving hose operators (pipe pullers) must be operated by formal diving operators, and no one is allowed to replace them (see the responsibilities of personnel at all posts in the diving operation team).
3. Before diving operation, the water depth, flow rate, water temperature and impurities in the pipeline at the operation site shall be understood and carefully filled in the diving log.
4. According to the underwater operation content and workload, combined with the impurities in the pipeline at the operation site, carefully analyze various situations that may be encountered in the diving operation, and develop the diving operation plan and emergency safety guarantee measures.
5. When the diving operation starts, fence devices shall be set around the diving operation; Signal lights shall be hung for night work, and sufficient working lighting shall be provided.
6. Diving operators must be familiar with the regulations on the use of signal ropes and the contact signals agreed in advance. In particular, the signal rope must be tied for operations in deep water, current surge, pipelines and reservoirs, so that in case of telephone failure, the signal rope can be used to transmit signals.
7. When two or more groups of diving operators are working at the same working face, they should always check their respective gas supply hoses and signal ropes to prevent intertwining.
8. The messenger and pipe puller must always observe the tightness of the signal rope and gas supply hose, and ask about the underwater operation at any time to prevent accidents. When two groups of divers work at the same time, the diver who finishes the task first must wait on the diving ladder after coming out of the water, and the diving gear can be unloaded after the other diver comes out of the water.
9. Tools and objects required for underwater operation shall be sent and received, and throwing is strictly prohibited. Divers are not allowed to carry heavy objects to rise out of the water.
10. The floating or heavy rubber hose can be selected according to the working environment. Floating rubber hose shall be adopted in underwater installation and removal works; Heavy rubber hose should be used when working in culverts, dams or areas with deep water and large flow velocity.
11. The diving equipment shall be kept and used in archives. Diving suits and gas supply hoses shall be regularly inspected, cleaned and disinfected. Those failing to meet the safety strength requirements shall be scrapped and out of service.
12. The oil-water separator in the gas supply equipment shall be drained in time and cleaned regularly according to the service time; The activated carbon or other substitutes in the air filter should also be replaced or cleaned regularly according to the use condition.
13. When diving outside, there must be written instructions from production scheduling and written safety technical disclosure prepared by technicians for the work, and the work can only be carried out after the purpose of the work is clear.