1. Project Overview
The underground bidding project is divided into unit projects. The main construction projects include: main drainage pipeline installation, downhole pressure pipeline installation, underground nitrogen injection pipeline installation, underground grouting pipeline installation, underground fire sprinkler pipeline installation, underground Power lighting network installation, underground main drainage pump room machinery and equipment and distribution control installation (including commissioning, testing), underground main substation equipment installation (including commissioning, testing) and other engineering construction.
The project includes underground power lighting line network installation project. The main contents of the project include the laying of cable trays for underground power systems, the laying and wiring of high and low voltage power cables, the laying of grounding systems, the installation of explosion-proof lamps for tunnel lighting systems and the installation of cables.
2, the main high-voltage cable laying list:
Ground 110KV substation to underground main substation DS1/DS2: MYJV22-8.7/10KV 3*240 1800M
Wellhead emergency distribution room to emergency drainage pump YJ1/YJ2/YJ3: MYJV22-8.7/10KV 3*70 1650M
Downhole main substation to tape machine substation H1/H2: MYJV22-8.7/10KV 3*150 400M
Underground main substation to fully mechanized mining face H3: MYJV22-8.7/10KV 3*70 400M
Downhole main substation to main road head substation H4/H5: MYJV22-8.7/10KV 3*185 600M
Underground main substation to the trough facet H6/H7/H8: MYPTJ-8.7/10kV 3x70+3x35/3+3x2.5 600m
Underground main substation to the main road to face excavation H9/H10/H11: MYPTJ-8.7/10kV 3x50+3x25/3+3x2.5 1100m
Underground main substation to the main road with excavation surface H12/H13/H14: MYPTJ-8.7/10kV 3x50+3x25/3+3x2.5 1000m
Underground main substation to fully mechanized mining face H15/H16: MYJV22-8.7/10kV 3x120 400m
Downhole main substation to downhole transformer T1/T2: MYJV22-8.7/10KV 3*50 58M
Underground main substation to underground drainage pump house PS1/PS2/PS3/PS4: MYJV22-8.7/10KV 3*50 110M
3. Cable laying special program
3.1 Cable laying method
There are two ways to lay out the cables in the project: the ground part of the cable is laid along the cable trench, the cable in the main inclined shaft of the underground part is laid along the cable tray, the cable in the belt and the cable in the slot are laid along the cable hook, and the underground main substation And the cable in the main drainage pump room is laid along the cable trench.
3.2 Main construction plan of the inlet cable
There are 7 power cables entering the well, which are from 110KV substation and wellhead emergency drainage pump power distribution room. The cable length is 1800 meters and 1650 meters. According to the manufacturer's cable tray capacity, the incoming cable will be divided into 4 trays. When laying, it should be laid separately according to each plate. The laying route is designed along the cable trench and cable tray. The technical solutions are as follows:
3.2.1 Ground substation part
(1) Lift the whole cable of the first high-voltage cable to the main inclined wellhead with a lifting machine, and use a special cable lifting frame (rated load 10T) to lift the cable away from the ground by about 10~15 cm to ensure the cable tray is good. Scrolling.
(2) The cable tray should be placed 5 meters away from the main inclined shaft to facilitate the removal of the cable from the disk.
(3) Calculate the distance from the main wellhead to the 110KV substation on the ground.
(4) Turn the ground cable trenches into the bends, and place the upper and lower openings, and arrange the cable pulleys and corner blocks. The pulley must be fixed firmly.
(5) Arrange a slow electric winch (or back winch) at the door of the 110KV substation, and fix it firmly.
(6) At the beginning of the cable, add the insulation sheath cover, and use the cable special traction net to start the head, and fix it firmly.
(7) Along the cable route, the soft wire wire rope is placed by the winch, and the hole is bent through the hole and connected to the cable head.
(7) Cable trays, winches, cable trenches, tunnels, and intermediate sections of cable trenches. Each person is assigned a special care cable to lay the cable. In case of emergency, immediately stop by the walkie-talkie.
(8) During the driving process of the winch, the driver's energy should be concentrated to prevent the cable from being damaged due to excessive force.
(8) When the cable is laid to the measured number of meters, the operation is stopped. Each caregiver along the line checks the cable laying conditions to ensure that the cable is laid along the correct line and is not traumatized.
(9) The cable should be tied and fixed firmly from the wellhead to prevent stress during the laying of the inclined shaft in the next step.
(10) When the mechanical traction is not in place, the concentrated personnel perform human traction.
3.2.2 main inclined shaft part
(1) Place the remaining cable on the first disk, swing it, and place it next to the main wellhead.
(2) The tail end of the cable is tied tightly with the traction net sleeve, and the beginning of the cable bridge is led.
(3) The cable head should always keep upwards slightly to prevent the cable from being blocked in the middle.
(4) The cable in the main inclined shaft is laid along the cable tray on the joist. A gantry is made at the beginning of the wellhead, and a pair of cable hook pulleys are hung, and the cable penetrates into the bridge.
(5) Install a pair of cable pulleys at the joists every 24 meters from the starting cable tray, and the pulleys are firmly tied.
(6) Install a pair of wooden brakes every 12 meters from the starting cable tray. The cables are passed through the wooden brakes. Each wooden brake is operated by a special person. Personnel should wear seat belts correctly.
(7) The traction of the cable in the main inclined shaft is carried out by the back column winch installed at the tail of the machine. According to the scene, the returning winch should be changed in the early stage to increase the capacity of the winch.
(8) According to the cable traction force calculation, the replaced soft wire rope 6*19+1 is 11mm in diameter.
(9) Another back column winch is installed in the wellhead room to prevent the cable from slipping during the cable laying process. The rope is lowered with the cable, and the cable is fastened with the cable and the cable every 15 meters.
(10) Check the lighting and sound signals before laying the cable.
(11) After the signal starts to be inspected, start the downhole column winch and the cable is laid from top to bottom.
(12) During the cable laying process, all the personnel along the line should concentrate, and when the cable moves too fast, use the wooden brake to increase the cable resistance and slow down the cable moving speed.
(12) Lay the cable to the predetermined position, place the laid cable on the side of the bridge, and reserve the length and position of the cable intermediate joint.
(13) It is estimated that the starting point and the terminal of the second cable are in the main inclined shaft, and the cable laying is laid from top to bottom along the above method.
3.2.3 One horizontal conveying part of the alley
(1) The starting point of the third cable is on the main inclined shaft 800 bridge, and the end point is on a 900 cable tray in a horizontal conveyor lane.
(2) The third cable is transported from the auxiliary inclined shaft to the interior of the main inclined shaft.
(3) The cable tray is supported, first laid to the main inclined shaft; after laying in place, the cable is opened at the bottom of the well and then laid into the main road.
(4) The main section of the cable is driven by the back column winch of the tail as a traction power, and another winch is set as the traction power of the other section of the cable.
(5) Install a hook traction bracket at the beginning of the cable in the main inclined shaft, and the winch wire rope will be returned to the head along the laying route.
(6) The cable head is tied tightly with the traction net sleeve and led to the cable bridge.
(7) The signal worker hits the cable and the cable starts to lay from the bottom to the top.
(8) Set up a special care cable laying every 18 meters along the way, and immediately stop in case of emergency.
(9) After the cable is laid in place, reserve the length. At the same time, the cable is tied and fixed firmly, and it is fixed once every 6 meters.
(10) The remaining cable is removed from the cable tray of the crucible, spread out, and the tail end is taken out.
(11) The cable tail end is tied tightly with the traction net sleeve and laid along the 900 bridge in the horizontal alley. Pay attention to the cable to prevent scratching when laying.
(12) After the cable is laid in the horizontal alleyway, it is firmly tied along the bridge.
3.2.4 Downhole main substation part
(1) The starting point of the 4th cable is 900 bridge in a horizontal conveyor lane, and the terminal is in the underground main substation 5# high voltage switchgear and 6# high voltage switchgear. When the cable passes through the communication lane and the auxiliary transportation lane, it is laid along the cable tray.
(2) Arrange the 4th cable to the intersection of the main conveyor and the communication lane.
(3) The laying sequence is to take the first high voltage switchgear of the substation and then to the main road.
(4) Arrange the winch in the communication lane, arrange a cable hook pulley at the appropriate position of the substation, and lead the wire rope to the pulley to return to the head.
(5) Before the cable is laid, measure the distance of the high-voltage switchgear along the cable trench to the breakpoint of the bridge.
(6) The cable is pulled by the winch wire rope and slowly moves along the cable tray. After being led down by the bridge, the length of the high voltage cabinet is reserved according to the distance measured in advance.
(7) After the cable is removed from the bridge, the cable is manually laid through the cable trench and through the high voltage cabinet.
(8) Measure the cable length from the laying point to the cable overlap point of the main road and compare the length of the remaining cable on the cable reel.
(9) If the remaining cable is consistent with the measured length, the remaining cables can be removed and laid along the bridge in the direction of the main road.
(10) When the cable is laid in the horizontal section of the main road, a cable pulley is placed at intervals of a certain distance, and the winch is used to pull back the head.
(11) The position of each segment cable connector is staggered.
3.3 Notes
(1) All participating construction personnel must obey the unified command.
(2) All construction workers wear labor protection articles with lighting tools.
(3) Stop all other operations of the main well before the construction is completed.
(4) The safety supervisor shall conduct a comprehensive safety inspection of the construction route and the pedestrian passage, and clean up the debris in the roadway to ensure the safety of personnel during the construction period.
(5) The construction route must have sufficient lighting and necessary communication measures.
(6) Construction workers should pay attention to anti-skid at any time during construction.
(7) Before the construction, it is necessary to organize all the participants to carry out all-person training to ensure that the participants understand the plan thoroughly and implement it in place; ensure the safe and smooth completion of the cable decentralization and laying tasks.
3.4 Cable laying route diagram
4. Safety measures
According to the construction characteristics of the project, in accordance with the internal and external environment and process operation requirements during the construction process, in order to ensure the safety of personnel during the construction process and the integrity of the site equipment, and to ensure the quality of the project and the construction progress, ensure safe construction, so that Safety first, prevention-oriented, special development of this special safety construction measures and strict implementation.
4.1 On-site safety construction organization
Establish a safe construction organization on site to organize and manage the site. At the same time, it is equipped with a full-time safety supervisor with high quality and strong business ability, responsible for the safety control of key processes and parts of the construction process to ensure safe construction.
The safety construction organization chart is as follows:
project manager
Safety production manager
technical manager
Full-time security supervisor
Pipeline construction team
Electrical construction team
4.2 Safety Management Objectives:
Eliminate all kinds of habitual violations, prevent minor injuries and above personal accidents, and eliminate major mechanical and equipment damage accidents.
4.3 Assurance measures
4.3.1 General provisions for safety management
(1) Before the construction, carefully prepare the operating procedures and safety measures according to the regulations, and organize all construction personnel to study carefully. The personnel who participate in the study must sign and pass the examination before they can participate in the construction; carry out the level-by-level safety technology to make the participation safe. The construction personnel who have paid the technical balance will be familiar with the safety construction content and sign after learning.
(2) Establish and improve the construction site safety management system, three shifts of construction, each shift has a duty manager and safety supervisors to participate. Strictly implement the relevant safety management regulations and management systems of the mining party, obey the unified management of the mining side, and strictly follow the regulations.
(3) All construction personnel must strictly implement the coal mine safety procedures, work practices and operating procedures, strict implementation of project quality standards, to firmly establish the safety first thought, is strictly prohibited illegal command, illegal operations, we found that insecurity must be addressed immediately, Resolutely do not work safely.
(4) Every person who goes down must wear a safety helmet, carry a self-rescuer and a miner's lamp with him. It is strictly forbidden to carry tobacco and ignition items. It is strictly forbidden to wear chemical fiber clothes. Drinking alcohol is strictly forbidden before going down the well. And strictly abide by the system of entry into the well and the inventory system of personnel entering and leaving the well.
(5) Each class monitor and safety supervisor shall be fully responsible for the inspection of the safety facilities of the transportation system and the inspection of the safety conditions of the construction site. If problems are found, they must be rectified immediately, otherwise construction is strictly prohibited.
(6) When multi-person collaborative construction, it is necessary to clarify that the person in charge is responsible for unified command and mutual coordination. Dragging, pulling, smashing, lifting, smashing, should be called each other to prevent accidents.
(7) When using a winch to pull the device, it is strictly forbidden to pull hard tow. All personnel must be allowed to flash the ropeway and evacuate to a safe location.
4.3.2 For the construction of professional work with dense underground space operations and transportation, the project department shall formulate individual safety technical plans and measures before construction, and carry out detailed safety technical disclosure and sign confirmation.
4.3.3 The project department shall formulate safety plans and measures for fire prevention, anti-object combat, and mechanical damage in areas such as underground and ground construction.
4.3.4 Project Manager The organization project department regularly checks and evaluates the implementation of the safety control plan. For the unsafe behaviors and hidden dangers in the construction, the project department organizes the analysis of the reasons and formulates corresponding rectification and prevention measures. The project manager, construction workers and full-time security officers check the construction site at any time.
4.3.5 Underground fire prevention, gas prevention, dustproof
(1) Safety measures must be established when working underground in electric welding, and strictly abide by the underground fire-fighting permit system and related regulations.
(2) Anyone who discovers a downhole fire should immediately take all possible methods to extinguish the fire, control the fire, and report the mine dispatch room promptly, depending on the nature of the fire, the ventilation and gas conditions in the disaster area.
(3) When the electrical equipment is on fire, the power supply should be cut off first; before the power is cut off, only non-conductive fire-fighting equipment should be used to extinguish the fire.
(4) The mine is a low gas mine. When the underground construction is carried out, the construction is reasonably arranged according to the gas monitoring index of the constructor. The construction personnel must wear a self-rescuer to go down the well.
(5) During underground construction, temporary dust-proof water supply pipelines shall be laid in areas prone to dust, spray dust reduction during construction or dust reduction by dust collector to ensure personnel and construction safety.
4.3.6 Underground disaster avoidance route
Downhole construction personnel must be familiar with the evacuation route map and ventilation system map to the safe exit and permanent refuge chamber. When gas (coal dust) explosion, fire or flood accident occurs in the underground, the construction personnel shall quickly and safely retreat to the ground according to the principle of disaster avoidance and the map of the disaster avoidance route designated by the owner and the indication of the underground “avoidance route†sign. Or the permanent refuge chamber in the underground.
4. 3.7 Construction site safety discipline regulations
(1) Personnel participating in the construction should be familiar with the safety technical operation rules of this type of work. When entering the construction site, they should first learn the safety technical measures. Only after passing the examination can they arrange the operation.
(2) Obey the labor discipline, obey the command of the leaders and security inspectors, concentrate on the work, stick to the post, and do not engage in non-work operations without permission. It is strictly forbidden to go to work after drinking, and it is strictly forbidden to smoke in the underground.
(3) No fatigue work or sickness work, and regular physical examination for underground work.
(4) Special types of work shall be certified, and unlicensed personnel shall not operate electromechanical equipment without authorization.
(5) When using new technologies, new processes, new equipment construction and exchange of jobs, the operators must carry out new technical operations and safety education and training for new posts, and only after passing the examinations can they be put into operation.
(6) Wear personal protective equipment correctly according to the operation requirements.
(7) It is necessary to pay attention to safety when walking downhole, and to enter the working place, the pedestrian safety passage should be taken; when the ground lifting is hoisted, it is strictly forbidden to stand and traverse under the lifting arm and lifting objects.
(8) Proper use of protective devices and protective facilities shall not be arbitrarily removed or moved freely for various protective devices, protective facilities, warning signs, safety signs, etc. When moving, the person in charge of the site shall agree.
(9) Strictly implement the operating procedures, and must not violate the rules of command and illegal operations; the instructions for violation of the rules have the right to refuse, and have the responsibility to stop others from operating illegally.
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Component:
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4.Hydraulic Station
5.PLC control system
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Main frame:300H steel
Medium plate thickness: 16mm
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Joint-hidden roof panel profile:
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Joint-hidden Roof Panel Roll Forming Machine
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