Pipe plug removal (underwater wall removal) is a key work in the construction of drainage engineering, it is to ensure the segmented construction, and the construction of drainage, interception, diversion, connectivity and other necessary technical measures, especially for the original pipeline connector, intersection and so on. The seal head is a great threat to security, and its precautions and safety requirements are as follows:

1, before the operation should be opened one to two days in advance of the working face and the upper and lower reaches of the manhole cover, ventilation, and before the well, with a simple biological detection method, that is, put pigeons or chickens and other small animals in the well or pipe section. Thirty minutes later, if the small animal is not abnormal, and the hydrogen sulfide tester test qualified, the construction worker can go down the well operation.

2, During the construction period every half an hour with hydrogen sulfide tester detection and at any time to observe whether the small animals are normal, to determine the working environment has non-toxic gas. Necessary emergency measures must be taken in case of abnormal circumstances. 3. The head of plugging and dismantling should make detailed records, remember the number of the manhole, the blocking method, the upstream or downstream part, and attach drawings to explain, so as to avoid finding that the local water is not accessible after the completion of the project. Pipe plug removal (underwater wall removal)

4, the construction needs to block the original drainage pipe head, to first develop transitional measures to solve the drainage of the area, and in advance to the maintenance management unit for blocking procedures, after examination and approval to block.

5. Sealing and dismantling the plug also need to fill in the application form for the work of the manhole, and implement the guardianship personnel and rescue measures, which are implemented after the review and approval of the relevant departments.

6. Before operation, the front and rear manhole covers should be opened to make proper ventilation. The personnel who go down the well should wear gas masks and protective suits according to regulations, and tie the suspension-type safety belt at the waist. When lighting is required in the well, explosion-proof lamps must be used, and open fire is strictly prohibited in the well to prevent methane combustion or explosion.

7, the operation should strictly abide by the safety responsibilities of each post and the safety operation procedures. There are at least two people in the well, and it is strictly forbidden to leave the post when someone is operating in the well, and guardrails should be set up around the well. Personnel on the well are strictly prohibited from smoking, chatting, and throwing tools at the well head to prevent items such as yourself and cigarette butts from falling into the open well.

8, in case of sudden failure and accidents during operation, the person in charge of the site or the site guardian must immediately take safety technical measures and implement rescue measures for proper disposal. The operation must be stopped immediately, and the launching crew will come up immediately.

9, after the completion of the work, do a good job of cleaning the work place, and timely report to the official, to show the safety of the work.