I. Overview:
1, construction site: -22 mining area tracks down the mountain, a stone gate.
2. Construction content: the roof and side wall rock of roadway are sealed by thin shotcrete.
3, the construction site safety assessment:
Second, the labor organization:
Project leader: position: captain
Person in charge of safety: Yu Jinfa and team members.
Person in charge of construction: monitor of each class.
Construction personnel: operators in each shift, etc.
Safety inspector: the team leader of each class and Anwar?
3. Construction time: from the date when the measures are issued to the end of thin spraying construction.
Four, the preparation work before shotcrete:
1. Prepare mortar mixer, grouting pump, high-pressure hose, nozzle and other shotcrete equipment and tools, and install them on site.
2. Prepare composite materials, cement and reinforcing materials for shotcrete.
3. Prepare spraying materials as required: the mixing method is: water 100kg (two squares), cement 200 kg (four bags), reinforcing material 15kg (half a bucket) and composite material 17.5kg (half a bag). The spraying materials are required to be mixed evenly.
Verb (abbreviation of verb) construction methods and techniques
1, personnel composition:
Feeding: 2 people, mixing: 1 person (mixing driver), electrical fitter on duty: 1 person (part-time), sprayer: 1 person, water pump driver: 1 person, monitor: 1 person (part-time).
2. Before spraying concrete, clean up the contents of the work site:
(1) Remove obstacles in the work area, and remove two groups of floating gangue and sundries in the heading face.
(2) Bury signs and control the shotcrete thickness.
(3) When the pump driver can't directly touch the syringe, he should be equipped with a contact device.
(4) The operation area must be well ventilated.
(5) Before spraying concrete, sprinkle water on the roadway roof to reduce dust.
3. Check the equipment:
(1) Before the operation of grouting pump, check the grouting pump and its supporting equipment. Ensure the normal operation of construction machines and tools.
(2) Check the air duct and shotcrete pipeline to ensure that all pipelines are unblocked, and there is no air leakage or liquid leakage.
(3) Protect sprayed tunnel cables and pipelines, put down cables and cover them, and wrap or cover cables, cable hooks and pipelines with plastic sheets.
(4) Transport the materials needed for shotcrete to the shotcrete site, and adjust the shotcrete equipment to ensure the normal operation of the equipment.
4, shotcrete construction technology:
(1) Add water to the mixing barrel according to the proportioning requirements, and start the mixer. Reinforcing materials, cement and composite materials are added in proportion.
(2) Close the ball valve on the mixing barrel to make the mixing enter low-speed mixing. Open the screw pump ball valve, and the screw pump motor drives the screw pump to rotate and convey mud.
(3) Start the equipment for spraying concrete, spraying from one direction first, and then spraying from another direction after being basically solidified. The top can be sprayed twice as needed, evenly around the cracks in the coal wall and anchor net. When spraying concrete, stick to the top side first and proceed from top to bottom.
(4) After shotcreting, clean up the sundries on site in time, and flush the mixing drum, grouting pump and pipeline.
(5) The sequence of shooting along the gateway in -22 mining area is: from top to bottom, and then from bottom to top after shooting. The spraying method at the crosscut is the same as that along the track to ensure uniform spraying on the road.
5, mixture mixing requirements:
(1) The allowable deviation of weighing raw materials for various materials is 1%.
(2) The mixing ratio is: water 100kg (two grids) cement 200 kg (four bags) reinforcing material 15kg (half barrel) composite material 17.5kg (half bag).
(3) Add water first, then reinforce the solid material, add cement, and then add the composite material.
(4) When loading cement, put it into mixing bags one by one, and then put it into the next bag until the loading is over.
(5) Generally, when stirring, rotate forward for one minute, reverse for one minute, repeat for three times, and stir for about 6 minutes. Mix the mixture into a paste, and then start a trial spray.
6, nozzle operation:
(1) Spray angle of the nozzle: When the nozzle deviates from the vertical direction seriously, the sprayed cement-based slurry will roll or overlap on the spray surface, and the spray angle of the nozzle should be as vertical as possible.
(2) The distance between the nozzle and the spraying surface: the distance between the nozzle and the spraying surface should be less than the rebound of the slurry and strong pouring. This distance is 1.5-2m.
Six, safety technical measures:
(1) General safety technical measures:
1, all employees must hold relevant certificates, strictly implement various rules and regulations, and it is strictly forbidden to operate or command illegally.
2. Strictly implement the "finger dictation" safety confirmation system. All types of work and processes should be inspected before operation, and "finger dictation" safety confirmation should be carried out after there is no problem.
(2) Roof management:
Strictly implement the system of knocking to help ask the top, the monitor will assign experienced workers, use long tools (≮2m) to knock to help ask the top construction site and roadway along the way, find out hanging gangue and living rock, and support will be in place in time. This work must be carried out by two people, clearing the evacuation route in advance, one person is responsible, the other person knocks on the top, and it is carried out from outside to inside. And deal with the roof first and then the sides.
(3) safety technical measures for shotcrete:
1, should make all preparations and safety inspection before shotcreting. When mixing materials, you must choose a suitable place, so as not to affect other work operations such as transportation.
2. Before shotcreting, clean up the floating gangue at both ends of the roadway and clear it to a solid bottom to ensure that it does not slip and wear skirts after shotcreting.
3. Check the operation of grouting pump before shotcreting, including the fastening of various parts. Ensure that the seal is intact and the lubrication is normal. When problems are found, they must be dealt with before operation.
4. After spraying concrete, clean the cement in the pipeline and pump with clear water.
5, shotcrete work generally by two people, two people must cooperate closely, handle in time when problems are found. Sprayer should master the angle and distance of spraying and strive to spray vertically on the rock surface. Under any circumstances, it is forbidden to point the gun at people.
6. Before spraying concrete, cover the electrical equipment, cables, feng shui pipes and other facilities within the spraying range with old rammers, plastic sheets or other materials; After shotcreting, clean it carefully, and clean the trench of cables, mechanical equipment and rebound materials that fall to the ground. After cleaning, the rebound materials shall not be loaded immediately, but must be solidified before loading, so as to avoid solidification of the rebound materials in the car.
7. Before shotcreting, the construction team must take good care of the dangerous rocks on the roadway roof. In the area where metal mesh is used, before spraying concrete, the rusty metal mesh should be knocked to deal with rusty objects, and more rocks should be put down in the mesh. If the anchor net falls off seriously, the anchor rod should be added first to make the net close to the rock surface, and then the dust in the roadway should be washed. For the area where the roof rock is broken, the proportion of water should be reduced and sprayed several times to achieve the purpose of plugging the cracks.
8. The order of gunning is: adding water → opening the mixing barrel → preparing for feeding → opening the grouting pump → spraying. Stop time: stop material → stop water → stop wind.
9. When dealing with pipe plugging, assign special personnel to hold the spray gun head firmly, and pressure treatment is not allowed. Stop the wind, open the liquid return valve and tap the pipe blockage, and then close the liquid return valve for air supply treatment.
10, if the knocking method fails to handle it, the pipeline shall be dismantled after the wind stops.
1 1. When taking out the sundries from the mixing barrel or grouting pump, the wind must be stopped first, and the sundries in the body should be taken out with a special tool holder or a long-handled tool. It is forbidden to reach out and take it directly.
12, the gun head is not allowed to point at people under any circumstances. 13. Before spraying concrete, the ventilation team should set up two sets of dust-proof water curtains in the return air flow according to regulations, and it is required to be in a normally open state when spraying concrete.
14. Before spraying chemicals on the slope, the construction team will improve the inclined lane lifting signal, and then set a signal. With the operation of the spraying machine, the remote winch will be lifted. Before lifting, the signalman can only send a lifting signal in the hidden adit after all the personnel below the shotcrete machine enter the safe adit to hide.
15 inclined lane or drift stop sending, must designate a person to operate. When dealing with the failure of the shotcrete machine or the blockage of the feed, you must first cut off the power and stop the wind, and lock the switch. After handling, the maintenance personnel can only contact the other party to send electricity, cut off electricity, supply air and stop the wind. At the end of shotcreting in the inclined lane, the shotcrete machine must be powered off and stopped, and then the shotcrete machine should be mentioned in the drift of the parking lot. The shotcrete machine is not allowed to lift with electricity.
16, before shotcreting in inclined lane, the construction team must conduct a comprehensive inspection and trial operation of mechanical equipment (winch, wire rope, pressure column, ground anchor pile), air duct, shotcrete pipe and water pipe. If problems are found, the power supply or wind must be cut off before treatment.
17, when shotcreting, water shall be delivered before feeding. It is forbidden to stand in front of the shotcrete machine, left and right, under the car and shotcrete machine.
18. The hoisting quantity of inclined lane winch is: one shotcrete machine and one mine car. It is forbidden to pull, hook and operate without a license. The diameter of winch wire rope is not less than 18.5mm, and shotcrete machine and mine car must be fixed after parking. The fixing method is as follows: the shotcrete machine and the mine car respectively pass through the downhill track of the track with the diameter of 12.5mm, and then are fixed on the track with rope clips to prevent the shotcrete machine and the mine car from slipping down.
65438+ When using the spray gun, the up-and-down speed should be uniform, and the proportioning amount should be controlled on site. Spraying and patching must be even and timely to prevent it from happening from time to time.
20. The spray gun is operated by two people, one holding the spray gun. During shot peening, the personnel should hold the shot peening gun and straighten their arms for oblique shot peening (that is, the distance between the shot peening point and the personnel should not be less than 1.5m) to prevent the top side ballast from injuring people. Another person moves the conveying pipe, and be careful not to bend the hose to death, causing pipe blockage.
2 1, the coating thickness is 10mm, if the first coating is not enough, the interval time is 15 to 20 minutes, and the second coating will be carried out after the coating is solidified.
22. After spraying is completed, stop feeding first and continue to drain water into the mixing barrel. When the internal materials are sprayed for standby, after the gun head is discharged into clear water, stop the drainage and spray all the excess water in the barrel. Then stop the wind, remove the gun head and tidy up the tools.
23. If anyone passes during spraying, they must contact each other before passing.
24. After spraying, the construction unit will collect the remaining mortar in the operation section and use it as a ditch when the mortar is not solidified to ensure civilized production and ensure that the cable is hung straight on the cable hook.
25. Strictly implement the principle of "driving without driving, pedestrians without driving" during hoisting.
26. During the construction of thin spraying process, the production department and the mechanical transportation department will send people to the site for technical guidance.
27, the other according to the "operation procedures" and related regulations.
Attachment: Post Responsibility System
I. Project leader:
1, fully responsible for the construction method and construction sequence.
2. When thin spraying, special attention should be paid to the construction steps and safety precautions.
3. Be responsible for the organization, coordination and on-site safety inspection during the construction period, and start work only after meeting the safety requirements.
4. Attend the construction site, check the safety problems encountered in the construction process and handle them in time to ensure the construction safety. After the completion of construction, be responsible for quality acceptance.
Second, the head of security:
1, carefully check the roof of the construction site before construction, and be responsible for personal safety and safety during construction.
2. Before the project construction, tools, equipment and materials should be prepared, and operation is allowed only when conditions permit.
3, for every link, every step of the possible hidden dangers should be precontrol in advance, the site construction in strict accordance with the measures.
1. After the construction is completed, conduct a comprehensive inspection of the working face and construction situation to ensure that there are no potential safety hazards.
Third, the construction director:
1, responsible for personnel organization, arrangement and coordination during construction.
2, in the process of construction, responsible for coordinating with the relevant units, to ensure that the material supply in place, make good preparations for production.
3, reasonable division of labor, according to the measures to command the specific operation construction.
Four, safety supervisor:
1, supervise the implementation of safety technical measures on site;
2. Supervise the implementation of the three rules on site;
3, have the right to stop illegal operations and illegal command behavior.
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