Date of Approval 1997-04-01 Implementation Date 1998-01-01
1 Subject Matter and Scope This standard specifies the mine shaft of metal and nonmetal underground mines, safety requirements and industrial hygiene requirements of underground mining, transport and lifting, ventilation dust, electrical installations, waterproofing and drainage, fire prevention and fire fighting, etc. .
This standard applies to the design, construction and mining of metal non-metallic underground mines within the territory of the People's Republic of China.
This standard does not apply to the exploitation of coal mines, coal and coal pyrite and other symbiotic deposits.
2 Reference Standard GB4792 Radiation Hygiene Protection Basic Standard GB5748 Workplace Air Dust Determination Method GB5749 Living Drinking Water Hygiene Standard GB6722 Blasting Safety Regulations GB13349 Large Blasting Safety Regulations GB14161 Mine Safety Sign GBJ70 Mine Power Device Design Specification GBJ213 Mine Roadway Construction and Acceptance Specification TJ36 industrial enterprise design sanitary standard 3 term metal non-metallic underground mine metalandnonmetalundergroundmines
Mining of metal ore, radioactive ore and underground mines as chemical raw materials, building materials, auxiliary materials, refractory materials and other non-metallic minerals (except coal).
4 Management 4.1 Mining enterprises and their competent departments must implement the safety first policy of “safety first, prevention firstâ€, and gradually realize scientific and standardized safety management; plan, arrange, inspect, summarize, and evaluate production and construction work. At the same time, it is necessary to plan, arrange, inspect, summarize, and evaluate safety work.
4.2 Mining enterprises must establish and improve the safety production responsibility system.
The mine manager is responsible for the safe production of the mine.
The principal responsible persons at all levels are responsible for the safety production work of the unit, and their technical leaders are responsible for the safety and technical work of the unit.
Each functional agency is responsible for the safety production work within its scope of responsibility. [next]
4.3 Mining enterprises and pits (shops) shall be provided with safety agencies or full-time safety officers; the mining teams shall have full-time safety officers; classes and groups shall have full-time or part-time safety officers.
Full-time security personnel shall be employed by personnel who have graduated from a secondary professional school (or equivalent), have the necessary safety expertise and safe work experience, have been engaged in mine professional work for more than five years and can often go to the scene.
4.4 Mining enterprises shall establish and improve professional institutions for ventilation, dust prevention and radiation protection, equip with necessary technicians and workers, and include them in production staffing.
The number of full-time personnel for ventilation and dust prevention shall be no less than 5% to 7% of the number of dust-collecting persons.
4.5 The mine manager must undergo safety training and assessment, have safety expertise, and have the ability to lead safe production and handle mine accidents.
The person in charge of the safety professional agency and the professional department of ventilation, dustproof and radiation protection must carry out professional training for not less than one month after the competent industrial department or the unit designated by the head office of the ministerial level, and obtain the certificate of conformity after the examination.
4.6 Mining enterprises should earnestly do a good job in safety production and labor protection education, popularize knowledge of safety knowledge and safety regulations, and conduct technical and business training. Employees are qualified to pass the examination. All cadres and workers are required to receive at least 20 hours of safety education every year and at least once every three years.
Before the new workers go down the well, they should carry out three levels of safety education for mines, pits (shops) and teams at no less than 72 hours. After passing the examination, they will be led by the old workers for at least 4 months. They are familiar with the operation techniques of this type of work and have passed the examination. Can work independently.
Personnel who change jobs must be trained in the safety of new post operations.
With new technology, visits, and interns, safety education must be carried out before going down the well, and there are special people to lead.
Participate in labor, visits, and interns, and must conduct safety education before going down the well, and have a special person to lead.
Mines should establish and improve safety education rooms.
4.7 Special operators, operators of key positions, important equipment and facilities must undergo technical training and special safety education. After passing the examination and obtaining the operation qualification certificate or license, they are allowed to go to work. Personnel training, assessment, certification and review shall be carried out in accordance with relevant regulations.
4.8 Key posts, important equipment and facilities, and hazardous areas should be strictly managed with lighting and warning signs.
4.9 The mining enterprise shall determine a reasonable mining sequence and produce it after the development of the development system such as lifting, transportation, ventilation and drainage.
4.10 All equipment, such as safety, ventilation, dustproof, fireproof, waterproof, etc., shall not be destroyed or used for other purposes, and shall not be arbitrarily removed without the permission of the competent department.
4.11 Mining enterprises must have the following measured charts: geological structure map, hydrogeological map, lithology distribution map, composite map of ground engineering and underground engineering, plan of development system, vertical and horizontal section, plan of each middle section, ventilation system diagram, Distribution system and underground electrical equipment layout, water supply and drainage system map and mining progress chart. The chart should be correctly labeled: [next]
a. The location, name, specifications and quantity of the roadway that has been excavated and planned (annual);
b. The location and quantity of stopes (mines) mined in goafs (including filled goafs), abandoned wells and planned (annual);
c. Ore transport line;
d. The location of equipment and facilities such as safety, ventilation, dust, fire, and drainage;
e. Routes and safe exits for safe evacuation of personnel;
f. The progress, mode, quantity and location of the surface subsidence area of ​​the goaf and abandoned shaft.
The above chart should be filled at least once a year as production progresses.
4.12 Operators are strictly prohibited from drinking alcohol before going down the well; they must carry lighting fixtures when going down the well; they must check the ventilation before work, and carefully check and handle the pumice at the top of the operation site. When there is a serious threat to personal safety at the work site, it must be quickly evacuated from the danger zone, and reported and handled in a timely manner. At the same time, the warning and lighting signs shall be set up. 4.13 The mine construction project must have a mining design approved according to the state's prescribed procedures and authority.
The feasibility study report and overall design of the construction project must demonstrate the safety conditions of the mine. The preliminary design stage must have a safety and health chapter, and should be used throughout the professional design.
4.14 While preparing the annual production construction plan and long-term development plan, the mining enterprise and its competent authorities must prepare safety and health engineering technical measures plans and plans, and extract and use the special costs of safety technical measures according to national regulations. This fee must be used to improve the safe production conditions of the mine and must not be used for other purposes.
4.15 Mining enterprises must establish and improve the safety production post responsibility system and post technical operation procedures, and strictly implement the duty system and handover system.
4.16 Mining enterprises must establish and improve the listed attendance system and inspection system for access to mines. The head of the duty station must accurately grasp the number of attendances and the place of work; if it is found that someone has not yet left the well after dispatching, it should immediately report to the dispatching room and relevant departments, and promptly find out the reasons.
It is strictly forbidden to work alone in remote and dangerous working places.
4.17 Mining enterprises shall establish and improve the safety activity day system; the safety inspection system shall be carefully implemented.
The competent department of the mining enterprise shall inspect the mine to be inspected at least once a year; the mine shall be inspected at least once a quarter; and the pit (shop) shall be inspected at least once a month.
When inspecting, there should be leaders in charge of safety work. For the hidden dangers of accidents and dust hazards, the relevant deadlines shall be resolved.
4.18 Mining enterprises must distribute labor protection supplies to employees in accordance with regulations. Workers must wear and use labor protection supplies and utensils as required.
4.19 Mining enterprises shall establish an ambulance and medical emergency organization consisting of full-time or part-time personnel, equipped with necessary equipment, equipment and drugs. Respond to self-help and mutual rescue training every year.
4.20 The casualties must be reported to the competent labor administrative department and the competent department of the mining enterprise in accordance with the regulations.
The casualties must be reported to the competent labor administrative department and the competent department of the mining enterprise in accordance with the regulations.
After the accident, it is necessary to investigate and analyze in time to find out the cause of the accident and propose measures to prevent the occurrence of similar accidents. [next]
5 Mine shafts 5.1 General provisions 5.1.1 Mine shaft and road construction and acceptance, should comply with GBJ213.
5.1.2 Construction organization design of the roadway engineering. The construction period is mainly prepared by the construction unit and the design unit participates and is reported to the supervisor of the construction unit for approval. The production period is prepared by the mining enterprise and reported to the competent mine manager for approval. Special excavation method and construction organization design through special sections shall be reported to the higher authorities for approval.
Before construction, construction personnel must be organized to study the construction organization design. During construction, it must be operated in accordance with the provisions of the construction organization design to ensure the quality of the project.
5.1.3 Each mine shall have at least two independent safety exits directly to the ground. The distance between the safety exits shall not be less than 30m.
In large mines, the geological conditions of the deposit are complex. When the length of one wing exceeds 1000 m, a safety exit should be added to the lower part of the end of the ore body.
At each production level (middle section), there must be at least two safe exits for pedestrians and a safe exit to the ground.
The roadway of the shaft must have a road sign indicating its location and the direction to the ground exit. All downhole workers must be familiar with the safety exit.
5.1.4 When lifting the shaft as a safety exit, there must be a properly functioning lifting device and a ladder room.
5.1.5 The setting between shaft ladders must meet the following requirements:
a. The inclination of the ladder is not more than 80 (;
b. The vertical distance between two adjacent ladder platforms is not more than 8m;
c. The ladder holes of the upper and lower adjacent platforms are to be staggered, and the length and width of the platform ladder holes are not less than 0.7m and 0.6m respectively;
d. The upper end of the ladder is 1m above the platform, and the lower end is not less than 0.6m away from the well wall;
e. The ladder width is not less than 0.4m, and the ladder spacing is not more than 0.3m;
f. The ladder room and the lifting room should be completely separated.
5.1.6 Pedestrians should be provided with sidewalks for the transportation of inclined shafts. The sidewalk should meet the following requirements:
a. The effective width of the sidewalk is not less than 1.0m;
b. The effective net height of the sidewalk is not less than 1.9m;
c. Inclined shaft slope is 7 (~15 (when, pedestrians should be set; 15 (~13), steps and handrails should be set; greater than 30 (when, ladders should be set;
d. An inclined wall for transporting materials, between the driveway and the sidewalk, should be provided with a strong partition wall.
5.1.7 Pedestrians shall be provided with sidewalks for horizontal transportation lanes. The effective net height shall not be less than 1.9m, and the effective width shall comply with the following provisions:
a. The lane of human transportation is not less than 0.7m;
b. The lane of the locomotive transportation is not less than 0.8m;
c. Roadway for trackless transportation, not less than 1.2m;
d. The yard and the passenger board are not less than 1.0m on both sides;
e. There shall be two sidewalks at the bottom of the bottom of the mine yard, and each net width shall be not less than 1.0m; [next]
f. The roadway transported by the belt conveyor is not less than 1.0m.
5.1.8 In horizontal roadways and inclined shafts, the gap between the transport equipment and the support equipment shall be not less than 0.3 m; the gap between the belt conveyor and the protruding parts of other equipment shall be Not less than 0.4m; the gap between the trackless transport equipment and the support shall be not less than 0.6m.
5.2 Shaft excavation 5.2.1 When excavating in the topsoil, the following provisions shall be observed:
a. Ladders shall be provided in the wells, and no other simple lifting facilities shall be used to lift personnel;
b. In the construction of the water-bearing surface soil layer, the well ring should be erected and reinforced in time, the dense backing plate should be reinforced and measures to reduce the water level should be taken to prevent the sand wall loss in the well wall and lead to empty support;
c. When constructing in an unstable aquifer such as sand, silt or gravel, special safety technical measures must be taken.
5.2.2 When constructing the shaft, measures must be taken to prevent the falling of the object. A temporary working sealing plate must be set at the wellhead, and a well cover door is arranged on the sealing plate. A fence must be installed at both ends of the well cover door. The structure of the sealing disc and the manhole door must be strong and rigorous. The depalletizing facilities must be tight, and it is not allowed to leak or leak into the well. The tools and materials carried by the workers in the well must be tied securely or placed in the tool bag. It is strictly forbidden to throw materials or tools into (or in) the wellbore. 5.2.3 Vertical shaft construction shall be carried out with double-layer hanging plates. Before lifting the lifting plate, the winch, the suspended wire rope and the signal device must be strictly inspected, and all the workers under the hanging plate must be withdrawn. To move the hanging plate, it must be commanded by a special person. After the movement is completed, it must be fixed, and the gap between the hanging plate and the well wall should be tightly sealed, and the inspection should be confirmed to be reliable and accurate.
5.2.4 In the following cases, the operator must wear a seat belt, and the end of the belt should be properly clamped on the firm member:
a. Remove the protective rock pillar or protection platform;
b. Installing, repairing, or dismantling equipment in or on the derrick;
c. Handling suspension equipment, pipes, cables, or work on a lifting plate in a wellbore;
d. Take a bucket
e. After blasting, clean the pumice on the well circle;
f. Lifting pump operation during wellbore construction;
g. In the middle section of the wellhead where the operation in the wellbore is temporarily completed, support and lock operations are carried out.
5.2.5 Lifting with a bucket must comply with the following regulations:
a. It is forbidden to load or unload the bucket or tie the tool or material to the hook before closing the manhole cover;
b. A strong umbrella must be placed above the bucket;
c. The manhole cover should have an automatic opening and closing device so that the bucket can be opened and closed in time when it passes;
d. There shall be means on the derrick to prevent the drum from being over-wound, and the wire rope hanging the bucket shall be provided with a stable rope device;
e. The rock in the bucket should be 0.1m below the edge of the bucket, and the long objects in the bucket must be firmly attached to the bucket beam;
f. The key components on the bucket must be inspected once per shift;
g. There shall be no unfixed suspended objects around the wellbore of the bucket running channel; [next]
h. The bucket shall be lifted and lowered along the guide wire rope; when there is no guide rope in the initial stage of the shaft, or the lifting distance of the guide rope portion below the suspension plate shall not exceed 40m;
i. The number of buckets shall not exceed the specified number of people. The bucket personnel must face the outside of the bucket. It is strictly forbidden to sit or stand on the edge of the bucket. Hanging buckets containing materials are prohibited from being used by people;
j. It is forbidden to use automatic flip-type or bottom-opening buckets to lift personnel (except when rescuing casualties);
k. When the bucket lifts the personnel to the wellhead, the manhole cover door of the exit platform must be closed, and the bucket is stopped, and the authorized personnel enters and exits the bucket;
l. Good contact signals must be placed between the wellhead, the sling and the bottom face.
5.2.6 When using the rock grab machine, the following regulations must be observed:
a. Before the operation, the components of the rock grabber and the suspended wire rope shall be inspected in detail;
b. After blasting, the working face must be ventilated, sprinkled, treated with pumice, cleaned by the well and treated with the blind cannon, and the quasi-rock operation is allowed;
c. Do not grab large rocks that exceed the capacity of the rock grab;
d. When the rock grab is unloaded, the personnel shall not stand near the bucket;
e. It is forbidden to take the rock from the rocker blade by hand;
f. Lifting and grabbing the rock machine must be directed by a person;
g. When the rock grabber is temporarily not in use, it must be lifted to a safe height with a winch. When the bottom of the mine is working, it is strictly forbidden to use only the cylinder to lift the rock grab.
5.2.7 When constructing the shaft, a suspended metal safety ladder must be provided. The electric winch capacity of the safety ladder shall not be less than 5t. A manual winch shall be provided to facilitate the downhole personnel in the event of a power outage. When the suspension safety ladder adopts a safety winch with both electric and manual performances, no manual winch is required.
5.2.8 Each working site in the wellbore shall be provided with independent sound and light signal systems and communication devices to access the wellhead. When the tunneling and parallel work are carried out in parallel, the signals sent from the hanging plate and the heading face should be clearly distinguished, and designated personnel should be responsible. A wellhead signal worker must be provided. The entire signal system should be contacted by the wellhead signal worker and the hoisting machine room and the wellbore working surface.
5.2.9 When the wellbore is deepened, the deepened part of the wellbore must be separated from the upper middle section by a solid protective disk or a security rock column under the bottom hole. If a rock pillar is removed or the protection tray is withdrawn, special construction design must be carried out and approved by the competent mine manager.
5.3 Inclined shaft and roadway excavation 5.3.1 The construction of the opening part of the inclined shaft and the smooth road surface shall be carried out in strict accordance with the design, and timely support and masonry retaining wall shall be carried out.
5.3.2 Before using the rock loader, bucket loader, scraper, loader or manual exit, check and handle the pumice at the top of the work surface and the gang. When moving the bucket loader in an inclined well, no one is allowed below.
5.3.3 For inclined shaft construction, the following provisions must be observed:
a. The wellhead is provided with a car stop device linked with the hoist;
b. There are bumpers on the top of the well neck and the heading face, and there is a special person (signal worker) to look after the pipe. The bumper above the working face should move frequently with the advancement of the working face;
c. One side of the sidewalk in the inclined well, every 30 to 50m is set to avoid;
d. The underground has a boost signal with both telephone and sound and light. [next]
5.4 Patio and roadway excavation 5.4.1 Using common methods to dig into the patio and chute, the following provisions shall be observed:
a. The erected workbench must be firm and reliable;
b. It is necessary to set up a safe and reliable support shed in time, and make the distance to the working surface no more than 6m;
c. When the height of excavation exceeds 7m, facilities such as ladders and rafters shall be installed, and partitions shall be separated between the ladders and the rafters; if there is no ladder, there shall be ladders with upper sheds;
d. Patio and chute should be connected to the upper part of the road as soon as possible. Generally, no other projects are opened or opened before the penetration. Local ventilation measures should be strengthened when additional projects need to be added;
e. When the patio is drilled to about 7m from the upper roadway, the surveyor must give the through position and set the warning signs and fences in the upper roadway;
f. The slippery mine shall not be emptied, and the amount of ore that is not less than one shot shall be retained.
5.4.2 Tunneling by the hanging tank method shall comply with the following provisions:
a. Before connecting the tank, it is necessary to check whether the connecting device, protective cover, wire rope, air pipe joint, sound and light signal system and communication facilities of the components of the hanging tank are perfect and firm. If there is damage or failure, it must be processed before the operation;
b. The safety factor of the wire rope for lifting the lifting tank shall not be less than 13, and the number of broken wires in any one of the lay lengths shall not exceed 5% of the total number of the steel wires, and the wear shall not exceed 10% of the original diameter;
c. The hanging tank must be equipped with signalling devices for raising, lowering and stopping controlled by personnel inside the tank;
d. The signal communication and power control lines shall not be co-located with the hanging wire ropes in a hanging tank hole;
e. When lifting the lifting tank, the card and pumice should be handled carefully; the operator should fasten the seat belt and stand in the protective cover. The head should not touch the can lid and the tank wall; immediately after the lifting, the power supply of the hanging tank should be cut off. Tightening the brake device;
f. It is strictly forbidden to throw tools or materials from the cans;
g. The slope of the center hole of the patio should be no more than 0.5%;
h. The winch winch shall be locked on the short rail and disconnected from the rail of the roadway; the inspection of the hanging tank shall be carried out at a safe place;
i. When the patio and the upper roadway are connected, the upper roadway must be ventilated and guarded.
5.4.3 Using the climbing tank method to dig into the patio, the following rules must be observed:
a. When the tanker is running, the personnel must stand in the tank. If there is a card or pumice, it must be stopped.
b. When climbing the tank to the top of the rail, the umbrella should be close to the working surface, and the workbench should be close to the top of the rail;
c. Under normal circumstances, the use of self-weight decline is prohibited;
d. The guide rail application assembly pin is fixed; when installing the guide rail, the pumice should be cleaned under the umbrella, and then the guide rail is fixed firmly;
e. Clean the oil on the brakes in time;
f. For other safety matters, the relevant regulations for the dredging method should be observed. [next]
5.5 Well support 5.5.1 Tunneling in unstable rock formations must be supported. Excavation in soft or sand-sand rock formations, permanent support to the working face, temporary support or special support should be erected.
5.5.2 The distance between the support and the working face, the distance between the support and the working face shall be specified in the construction design; when stopping the excavation in the middle, the support shall be followed to the working face in time.
5.5.3 When erecting wooden supports, the following provisions should be observed:
a. Do not use decaying, boring, soft wood, and cracked pits. Pit wood should be treated with antiseptic treatment;
b. After the bracket is erected, the wooden wedge is applied to wedge the beam, the column and the top and the gang near the joint. The gap between the top and the two gangs must be tightly closed, and the joints of the beams and columns must be fixed with dowels;
c. The inclined shaft bracket should be supported by a lower support and a tie rod. For inclined wells with a slope greater than 30, permanent pillars shall be provided with struts;
d. The column nest should be hit on a stable rock;
e. Before the shooting, the bracket near the working surface should be reinforced with nails, braces, struts, etc.
f. It is found that the shed leg is skewed, fractured, the top beam is broken or the pit wood is rotted, etc., and should be replaced and repaired in time.
5.5.4 The shaft and bolt formwork must comply with the following regulations:
a. When removing the original bracket before the winding, it is necessary to clean the top and help the pumice in time, and take temporary roof protection measures; after the laying, the top hole should be filled;
b. If the pitch of the wood tires exceeds 1m and the spacing of the metal tires exceeds 2m, intermediate reinforcement shall be carried out;
c. For the roadway with a span of more than 4m, the joints of the metal tyres shall be bolted, and the joints of the wood tyres shall be firm and reliable;
d. The strength of the tyre shall have a safety factor not less than 3 times the weight of the support;
e. The lower string of the spinner shall not be used to support the workbench.
5.5.5 Shaft construction work must comply with the following regulations:
a. A temporary well ring should be installed between the permanent support of the shaft and the heading face, and the wedge and the back plate should be tightly clamped. The distance between the permanent support and the temporary well and the heading face shall be specified in the construction organization design;
b. When using ordinary drilling method to cross the topsoil, soft rock layer or flowing sand layer, the temporary well circle must be close to the working surface, and the well should be reinforced; the back plate should be tight and the wind should be laid in time; before the rotation, each class must have Special personnel inspect the movement and loss of surface soil, rock formation and drift sand after the surface and the well circle, and find the danger, must immediately stop the operation, evacuate the personnel, and handle it;
c. The shaft of the shaft must be kept flat and the interface is tight; the gap between the rock and the wall should be filled with gravel and filled with mortar; when there is water in the outside, it must be led out by a pipe. Seal the water.
5.5.6 Spray anchor support work must comply with the following regulations:
a. The anchor bolt, shotcrete or shotcrete support shall be specially designed; the distance between the spray anchor working face and the heading face, the bolt type, angle, thickness and strength of the spray body shall be specified in the design;
b. The eye hole of the mortar anchor must be cleaned and filled with filling; [next]
c. The anchor rod shall be subjected to tensile test, and the spray body shall be inspected for thickness and strength; for anchoring force test under the well, safety measures shall be taken;
d. The pallet of the anchor must be close to the lane wall and tightened with a nut;
e. When handling the clogging of the injection line, the lance must be facing down and must not be facing the person;
f. In the soft and broken rock stratum, the anchor bolt must be used to carry out the pre-protection of the roof; in the dynamic pressure roadway, the spray anchor and the metal mesh must be used for joint support; in the wells with water spray, the anchor is sprayed. Waterproof work must be done in advance;
g. For spray anchoring, personal protective equipment and well-equipped lighting should be worn.
5.5.7 The secondary excavation in the cemented backfill shall be carried out after the cemented backfill has reached the specified curing period and strength, and reliable support shall be erected.
5.6 Well Maintenance and Retirement 5.6.1 All wells and lanes supported shall be inspected regularly. The wellbore of the underground safety exit and the lift personnel shall be inspected at least once a month; the mine roadway with large ground pressure and the mining roadway with frequent personnel activities shall be inspected every shift. The problems detected should be dealt with in a timely manner and recorded.
5.6.2 Maintenance Mainly to upgrade the wellbore, transportation lanes and large diverticulum, safety technical measures plan shall be prepared and approved by the competent mine manager.
5.6.3 Maintenance of inclined shafts and flats must comply with the following regulations:
a. To repair or enlarge the section of the roadway, first strengthen the bracket near the work site, then remove the bracket at the work site and prepare for the temporary support work;
b. The number of brackets to be removed each time shall be determined according to the specific circumstances, and the removal of dense brackets shall not exceed two at a time;
c. Remove the brackets in the soft place of the roof, or repair the intersection of the roadway, the severe roof area, and support the bracket or erect the temporary bracket between the brackets;
d. When cleaning pumice, the tool must be manipulated in a safe place;
e. When repairing the inclined shaft, the vehicle should be stopped and the warning and obvious signs should be set;
f. When replacing the one-way roadway bracket, there must be no one inside.
5.6.4 Maintenance shafts must be prepared for construction organization and comply with the following regulations: [next]
a. It must be operated on a sturdy platform. There should be protection facilities and contact signals on the platform. There should be reliable communication between the work platform and the middle section.
b. The operator should fasten the seat belt;
c. Before the operation, the pebble on the middle of the horse head door and the well frame should be cleaned up;
d. The middle of each section of the horse head should be set up by a special person.
5.6.5 The entrance to the abandoned wells and diverticulum must be closed in time, and there should be obvious signs at the entrance to prohibit the entry of personnel. Scrapped shafts, inclined shafts and flat lanes, and fences with a height of not less than 1.5 m should be placed around the entrance to the ground, and the name of the original shaft should be indicated.
5.6.6 Waste shaft and dip angle 30 (above the waste inclined shaft, the supporting materials are generally not allowed to be recycled. If it is necessary to recycle, safety technical measures approved by the competent mine manager shall be formulated. Inclination angle 30 (the following waste inclined shaft) Or the recovery of the support material of the waste roadway must be carried out from the inside to the outside.
5.6.7 Repairing waste roadways should first understand the stability of the roadway itself and the distribution of surrounding structures, wells, goafs, etc., the air composition and temperature in the waste roadway, and confirm the safety before construction.
5.6.8 When repairing the flooded roadway, the exposed parts must be inspected in time and measures should be taken to prevent the sudden emergence of harmful gases and stagnant water.
5.7 Fall arrest 5.7.1 The connection between the shaft and each middle section must have sufficient lighting and a fence or metal mesh with a height of not less than 1.5m, and a stop device must be provided. The fence door is only allowed to open when passing through a person or vehicle.
hydraulic block valve 100L/min
Max. Flow: 100L/min
Pressure: 310Bar
GKV100 series
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