Due to the acceptance of the safety facilities on August 10, 2011, it is proposed that the power cable type and the special design of the main wellbore need to be dismantled and replaced. In order to eliminate the obstacles for the acceptance of safety facilities, the leaders of the mines participated in the dispatch and decided to pass the cable. Remove and replace. To ensure safe and smooth construction, develop this safety technical measure.
The demolition work determined that the person in charge of the construction is the deputy mine chief of the electromechanical department, and the safety deputy mine manager supervised the implementation of the demolition work.
Second, the construction method
1. Firstly, the safety department and the mechanical and electrical department determine the cables that need to be dismantled, mark them, check the electricity, and remove them after confirmation by the person in charge of construction.
2. Take the method of demolition from the bottom up. Construction workers generally operate inside the cage and must fasten the seat belt during construction.
3. The personnel arrive at the construction site by the cage and send a signal. After the cage is stopped, the demolition work is carried out. First remove the original fixing point of the cable to be removed, and remove the lower part of the cable in the cage, and the upper section is fixed on the ground beam. When dismantling, fix the upper cable first, slowly bend the cable from bottom to top, to the previous fixed point, follow this procedure, and so on, to complete the removal. After removal of the cable from the mining of coal shipped to the warehouse team.
The winch should be notified in advance during the demolition work. The winch should run at a constant speed and the lifting speed should be kept below 0.5 m/s.
Third, safety technical measures
1. Participating in the construction and construction personnel must participate in the safety technical measures and sign.
2. Before the construction, it is necessary to clearly identify the lifting signal with the wellhead signal worker and the bottom signal, hook driver, hoist winch driver and other personnel involved in the construction. During the construction process, there must be no debris around the wellhead to clean the sanitation around the wellhead. To ensure the safety of the wellbore workers.
3. During the construction work in the wellbore, the post of the upper wellhead and the lower wellhead must be arranged to guard the well at the wellhead and the bottom of the well to prevent other personnel unrelated to the construction operation from entering, which will affect the smooth progress of the work.
The signal is sent using a knocking cage. The signal stipulates that: 1 sound stops, 2 sounds rise upwards, three sounds fall, and four sounds adjust. At the same time, the construction personnel must have a designated person to wear a walkie-talkie and keep in touch with the ground. The signal is sent by the person in charge of the construction, and other construction personnel can send signals.
4. Before the construction, first check the wells and the pipelines, cables, ladders and other facilities in the wellbore from top to bottom. If the facilities are loose, the walls are dangerous rock, live rock, debris on the platform, etc. And other unsafe factors must be removed immediately and confirmed to be non-hazard before work. The inspection must be carried out once before each shift.
5. When performing all operations in the wellbore, the staff must bring a safety helmet and a safety belt with a firm and reliable inspection. The safety belt must be placed on the wire rope or the solid components of the cage. The safety belt must be carefully checked every time. If the safety ring is tightly closed, it must be replaced immediately if it is found to be damaged.
6. When you are in the cage and need to ride the cage, there are 4 people in the cage. You must hang the safety door. It is strictly forbidden to go up and down. Personnel in the wellbore from the cage to the top of the cage must pass through the discharge opening at the top of the cage. It is strictly forbidden to enter or exit the tank from the side of the cage to the top or the outside of the cage.
7. When operating in the wellbore and cleaning all debris in the wellbore, the signal device must be set in advance. The signals in the wellbore and the wellhead must be sent by the full-time signal worker. During the lifting, the hand must not leave the button. Keep your head clear and listen to the signal before you can send it. You must stick to your job position, and you are forbidden to leave your job. During work, it is strictly forbidden to do things that are not related to work. It is strictly forbidden to enter the well shed, and the wellhead hygiene should be cleaned up in time. Construction workers must be familiar with and learn to send signals.
8. When constructing the cage, you must inform the main lift driver in advance and slowly raise it at a constant speed. The lifting speed is not more than 0.5 m/s.
9. When lifting all material tools in the wellbore, it must be fastened with rope and tied tightly to prevent the falling wellbore from damaging the equipment.
10. Install mine explosion-proof telephones from the wellhead to the bottom of the well and the working place. The telephone at the work place will go up and down with the work place to ensure smooth communication.
11. In the installation process, it is necessary to use gas welding tools at the wellhead and underground dock doors. It is necessary to formulate safety technical measures according to the relevant provisions in Chapter 5 of the “Safety Regulations for Coal Minesâ€, “Fire Prevention†and “Fire Prevention Measures for Minesâ€. Construction is carried out.
12. There is a safety office and a designated person (at least one person) appointed by the mechanical and electrical department to carry out safety inspection and technical supervision of the construction.
13. Before the construction workers take over the work, they must stand above the cage and check the condition of the well wall, pipelines and cables from top to bottom, and find out the problems in time.
14. This measure is specially prepared for the construction of the cable removal in the wellbore. All participating construction personnel must learn to sign before they can participate in the construction. If there is a major adjustment in the construction or it is inconsistent with this measure, the construction personnel must report the preparation personnel and make or supplement the measures before proceeding with the construction.
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