First, the situation description:
According to the production organization arrangement, due to the need to set up distribution points, the right side of the 9 coal point transportation lane 24# is extended to the right side to ensure the construction safety and engineering quality. The following safety technical measures are formulated.
Second, technical measures:
1. Construction location and scope
For the 9 coal point of the 9 coal concentrated transportation lane, the right side of the right side of the 24# is expanded and the net is widened by 2m.
2. Lane section and design requirements and engineering quantity
Original semicircular arch section: gross width: 4.2m, net width: 4.0m, height: 3.75m, net height: 3.65m, wall height: 1.65m.
Irregular arch section: gross width: 6.3m, net width: 6.1m, height: 3.75m, net height: 3.65m, wall height: 1.65m.
The construction is extended along the direction of the right, and the width of the brush is 2.1m. The height of the brush is 3.75m, of which the wall height is 1.65m, the arch height is 2.1m, the shotcrete is 100mm, and the expansion brushing capacity is 270m3.
Attached to the 9 coal centralized transportation lane expansion section
3. Support form:
After the expansion, the anchor net and the spray support are used to support the roof, and the top and the anchor are arranged vertically with the roadway outline;
1 The anchor rods are made of Φ20×2000mm garden steel anchors with a spacing of 800×800mm. 2 solidifying agents. The top bolt torque requirement is not less than 100N·m, and the anchoring force is not less than 50KN. The torque requirement of the anchor bolt is not less than 60N·m, and the anchoring force is not less than 30KN.
② steel mesh steel mesh as Φ6.0mm, the web was 2.5m × 0.9m, a grid of 100 × 100mm, a width of the overlap between the network and the network is not less than 100mm, the choice of # 14 wire cut the long iron networking 400mm The small section, the double strands are folded in half, the number of twisted knots is not less than 3 turns, and the joints are dense, and the joint spacing is not more than 300 mm;
3 Anchor cable adopts steel stranded wire with the specification of Φ15.24×6300mm, the row spacing is 1600×1600mm, the pallet adopts 300×160mm channel steel, the anchor cable is installed with 4 volumes of CK2335 anchoring agent per hole, and the cable length is controlled. At 200mm; anchor cable anchoring force is not less than 23T; tension preload is not less than 12T.
4 spraying the expanded section, the thickness of the spray is 100mm; the cement is made of ordinary Portland cement, the cement is 32.5#, the sand is medium coarse sand, the particle size is φ0.3~3.0mm, and the water content is about 5%; The stone is gravel. In order to reduce the rebound, the particle size is 5~8 mm. The concrete ratio is: cement: sand: stone = 1:2:2, the water-cement ratio is 0.45; the amount of quick-setting agent is cement. 3 to 4% of the dosage requires initial coagulation within 3 to 5 minutes, and final condensation within 10 minutes.
4. Construction method:
Construction process: safety inspection---knocking to help top---eye drilling, charging, connecting line, blasting---manual loading---hitting bolt, hanging net, anchoring cable---shotting
1 Before construction, the ground survey personnel shall calibrate the middle and waist lines of the construction section in time, and the operators shall strictly follow the line construction.
2Before construction, first connect the Feng Shui pipeline and prepare the materials and tools used.
3 When the thickness of the roadway is less than 600mm, the wind is used manually. When it is larger than 600mm, the drilling method is used for drilling. It is necessary to make more eye-opening and less charge. Each hole must be filled with water cannon mud and sealed with artillery.
(1) Blasting construction process
a, eye
1 eye-catching YT28 air-leg rock drill , both with wet eyes
2 before the eye, first observe the support of the working face and the top of the situation to knock on the top, to more eye, less charge, put a small cannon; the blasthole is arranged in a direction of the wedge-shaped sulcus, the eye distance is not more than 600mm, Do not apply more than 2 rolls per eye.
b. Charge: positive charge;
1 Before the charge, the blaster must assemble the explosive charge at a safe place. The blasting busbar is properly hung on the side of the roadway. Not with the metal, in contact with the cable conductors and the like, to ensure that the bus is not charged when blasting, checking the gas concentration within the range of from 20m face when 0.8% or less, the start charge.
2 When filling the medicine, slowly put the medicine roll into the eye, use the gun stick to light the medicine roll to the fundus, prevent the medicine roll from being wiped off, and seal the eye with the gun mud and water foam after loading the medicine roll.
3 Explosives are three-stage coal mine emulsion explosives, and the detonator type is a millisecond delay electric detonator.
c, inline: the connection method is serial
When connecting the line, the joint of the detonator should be scraped clean and kinked firmly. Before connecting with the blasting busbar, the two blasting busbars should be touched to check whether the busbar has electricity to ensure that it can be connected to the detonator footline without power. .
d, blasting
1Before blasting, the squad leader will send a special line to set up a warning line at all the passages that may enter the shooting position. The warning distance is not less than 75m. The inspector shall conduct gas detection within 20m near the blasting site, and the gas concentration shall be less than 0.8% before blasting; 2 when blasting, if the electricity is not blasting, wait at least 15 minutes before checking along the line to find out the reason for processing. . After blasting, the blasting busbar power supply should be removed first, and the blasting busbars should be twisted together. It is found that the rifle gun should be dealt with in time. If it is the quality problem of explosive or detonator, drill a parallel blasthole at 300mm from the blink of an eye to recharge. Blasting treatment; it is strictly forbidden to hand or dig the blasting detonator.
(2) Construction bolt technology and requirements
Process flow: anchor hole position - construction bolt drilling - installation anchoring agent - installation anchor - fastening
1 When constructing the anchor support, the work must be carried out under reliable temporary support. When hitting the anchor, it must be from top to bottom, first install the top anchor, and then construct the anchor.
2 Bolt drilling is completed by a single bolt rig. When drilling, the bolting machine is raised, the drill bit is inserted into the corresponding joist hole, and then the bolting machine is driven to drill. The drilling depth of the bolt is required to be ≥1950mm; Ensure the drilling angle, after the drill drills to the predetermined hole depth, reduce the anchor machine and clear the hole.
3 Put 2 pieces of CK2355 resin anchoring agent, put the bolt body on the tray and put the nut, insert the special agitator at the end of the rod and connect it with the bolting machine head, insert the rod end into the hole with the medicine roll installed, and raise it. The anchor machine feeds the medicine roll at the orifice into the bottom of the hole.
4 Use the bolt rig to stir the medicine roll. The mixing time is strictly controlled at 15~30S. At the same time, the mixing process is required to be carried out continuously. The middle of the process should not be interrupted. Wait for 1 minute after stopping the stirring. Tighten the nut with the bolt rig to make the bolt have a certain pre- Tight force.
5 The anchor pitch error shall not exceed the design value ±100mm.
(3) Construction anchor cable technology and requirements
Process flow: anchor cable hole position - construction anchor cable drilling - installation of anchoring agent - installation anchor cable - tension pretensioning.
The depth of 1 hole is controlled within 6100~6200mm.
2 Install the medicine roll: first put 4 pieces of CK2355 resin anchoring agent, then insert the anchor cable to push the medicine roll to the bottom of the hole.
3 The lower end of the anchor cable is connected with the anchor rig with a special agitator. Start stirring, first slow and fast. After the anchor cable is fully inserted into the borehole, use full-speed rotary stirring for 15~30S, stop stirring for 1 minute, and shrink the anchor rig. , remove the stirrer, the exposed length of the anchor cable should be controlled at 200mm after mixing.
4 pieces of anchor cable: Wait 15 minutes, install the channel steel, lock, pull the anchor cable with a tensioning jack to the pre-tightening force of 12T or more and then remove the jack.
5 Anchor cable spacing error shall not exceed the design value ± 100mm.
(4) Spraying construction technology and requirements:
1 Spraying with PZ-5 type shotcrete machine, the thickness of each initial spray should not be less than 30mm, and then re-spray.
2 When spraying, the distance between the nozzle and the surface to be sprayed is required to be maintained between 0.8 and 1.2 m, and the nozzle is perpendicular to the surface to be sprayed, spirally rotating, and the moving radius is 200 to 300 mm.
3 Shotcrete should be strictly proportioned, and the ground should be mixed evenly into the well. The dosage of quick-setting agent is generally 3%~4% of the weight of the cement. The location of the watering can be increased appropriately, and it is mixed with the loading. -
4 The tidal content of the sprayed concrete material is suitable for holding the ball in a hand, loosening the hand and lifting it without floating dust.
5 Before spraying concrete, it is necessary to carefully follow the midline to find the contour and use the hanging line to spray. Guaranteed spray thickness and surface flatness.
6 When spraying concrete, first spray 30-50mm, and then re-spray into the lane after solidification. Whether it is initial spray or double spray, the sprayed rock surface must be flushed with pressurized water before spraying to flush the floating dust.
7 After the concrete is sprayed, the roadway should be maintained regularly, and the water should be sprayed every small batch for the first 7 days. After 7 days, it should be washed with water every day. The curing time is not less than 28 days.
8 To ensure the quality of the sprayed material, the cement uses the products of the regular manufacturer, the sand and the stone should not contain the sundries and the soil, and the expired and damp-degraded cement and quick-setting agent are strictly prohibited.
9 Wash the sand and stone with water and mix the mixture before mixing. The mixture is used up on duty to prevent failure. The spray rebound rate does not exceed 15%.
Shotcrete quality requirements
1 The strength, mix ratio and amount of quick-setting agent of shotcrete must meet the design requirements. The flatness of the concrete surface is allowed to be 50 mm.
2 The quality of cement, water, aggregate and admixture must meet the design requirements.
3 mix ratio, admixture dosage must meet the design requirements.
4 Jet ç ¼: The centerline to gang distance must not exceed ±100mm of the design value.
5 The thickness of the jet is not less than the design value.
5, ventilation system
Ventilation route:
Working surface---9 coal centralized transportation lane---2# contact lane---5 coal return airway---return wind shaft---ground
6, transportation system
Transportation route: Auxiliary well---Circular yard---9 Coal auxiliary transportation lane---2#Contact lane---9 Coal centralized transportation lane---Working surface
Drainage route: work surface---9 coal centralized transportation lane---2# contact lane---9 coal auxiliary transportation lane---auxiliary well---ground
Both the material and the drainage are pulled by the battery car.
7. Disaster avoidance route
The principle of avoiding disasters is that floods go to high places, but they cannot enter the return airway, and fires go into the wind tunnel.
Disaster avoidance route in the event of a flood
Working surface---9 coal centralized transportation lane---ring yard---auxiliary well---ground
Disaster avoidance route in the event of fire, gas or coal dust explosion
Working surface---9 coal centralized transportation lane---ring yard---auxiliary well--ground
Third, security measures:
A. Construction safety measures:
1. During the whole construction process, the knocking and helping top system must be strictly implemented, and the dangerous rock and live rock of the top will be picked up with long handle tools in time. Adhere to the initial spray as a temporary support. Empty top work is strictly prohibited.
2. Before the blasting in the construction, the air duct, cable and line, lighting equipment, communication facilities and other equipment and facilities in the lane should be protected in advance. The specific requirements are as follows:
a. Lighting equipment, communication facilities and other equipment and facilities, etc., can be transported away, and should not be placed near the construction site.
b. Cables and fixed facilities within 10 meters around the blasting point should be covered with waste belts to prevent the gun from collapsing. The cable should be placed on the same side of the expansion and covered with a waste belt.
3. A large section must be brushed during construction, and the anchor net is supported as a section of the lane. The anchors to be constructed must be arranged for special personnel to be fastened. If there are failed anchors, they must be replenished in time. The on-duty schedule must be anchored on duty and must not be left empty.
4. During the construction process, a special person must observe the dynamics of the roof. If the problem is found, the personnel should be immediately evacuated and the work must be completed after everything is normal.
5, adhere to the team to go to work, relying on the front, to eliminate hidden dangers in a timely manner. Strengthen on-site management to ensure construction safety.
B. Blasting safety measures:
1. It is necessary to strictly implement the "one shot three inspections" and "three-person chain shots" system, and use wet-type eye-catching. Before and after shooting, it is required to sprinkle water on the working place to reduce dust, and to sprinkle water when installing.
2. Before each shot, the squad leader must assign a special person to set a number of safety warnings in all channels except the shooting position of 75m. The removal of the alert must also be removed by a special person with the squad leader.
3. The management of pyrotechnics strictly implements the provisions of Article 324 of the “Safety Regulations for Coal Minesâ€. The treatment of artillery and cannons must comply with the provisions of Article 342 of the Coal Mine Safety Regulations. The blasthole sealing strictly enforces the provisions of Article 329 of the Coal Mine Safety Regulations.
4. When the gas concentration in the wind flow reaches 0.8% within 20 meters near the blasting site of the working face, blasting is strictly prohibited.
C. Transportation safety measures:
1. Before transporting the material, it is necessary to carefully check whether the components of the winch are in good condition and confirm that there is no problem before driving.
2. The sound and light signals of the winch should be complete and reliable, and the signal must be connected to start and stop, so that the operation is accurate, uniform and timely.
4. The number of trailers complies with the relevant regulations on transportation management, and it is strictly forbidden to suspend vehicles.
5, transport materials use a good car and a "three-piece" device.
6. The materials should be bundled with steel wire ropes, and should not be replaced by other ropes; Ensure safety during transportation.
7. The materials to be loaded must not be super high, super wide, overweight, and transport long equipment must take corresponding measures.
8. When transporting materials, it is necessary to set a warning at both ends of the transportation range, and strictly implement the system of “no pedestrians, no pedestriansâ€.
D. Others strictly enforce the relevant provisions of the “Safety Regulations for Coal Mines†and the “Operation Procedures for Coal Mine Workersâ€.
Belt Tensioner Pulley,Stamping Belt Pulley,Rivet Tensioner Pulley,Bearing Pulley
Taizhou Chenhui Machinery Manufacturing Co., Ltd , https://www.chenhuipulley.com