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I. Construction Overview
The foundation of the explosion-proof door is reinforced concrete structure. The foundation of the explosion-proof door is 1 meter high, and the total height from the ground is 1.5 meters. The outer wall of the wellbore is coated with asphalt . Among them: the internal and external vertical ribs are thread Φ18 round steel @300, which is connected with the rebar of the return air shaft, and the inner and outer ring ribs are thread Φ16 round steel @300. The concrete is C30. There are 24 anchor bolts M20×600 in the upper part of the foundation, 8 δ22×160×330 steel lining plates, 800mm oil tanks with a width of 200mm and a water hole in the D300, and Φ66×8 L in the bottom of the oil tank. 2 pieces of 485mm, 1 piece of L=225mm.
In order to ensure the safe and smooth construction of the explosion-proof door, this safety technical measure is specially formulated.
Second, the scene description
1. The Zhejiang Zhongyu Yuyang Ruilong Project Department is responsible for the construction of the Shanxi Shouyang Fuyang Ruilong Company's new excavation and returning shaft shaft project. At present, the wellbore and the bottom hole connection have been completed, and the wellbore equipment has also been installed.
2. The hanging plate of the construction facility has been removed, and the temporary wellhead steel sealing plate has the conditions for constructing the foundation of the explosion-proof door.
3. The return air shaft and the bottom hole connection have been connected with the return air main road, and a full negative pressure ventilation system has been formed. The current return air shaft operation site is full negative pressure fresh air flow.
Third, the basis for preparation
Taiyuan Coal Industry Design and Research Institute design drawings S1812-118.3-1
Coal Mine Safety Regulations (2011)
"Preliminary Design of Ruilong Coal Mine"
"Preliminary Design and Safety of Mines in Ruilong Coal Mine"
"Control of Coal and Gas Assault"
"Organization Design of Returning Shaft Shaft Construction"
"Regulations for construction work of return air shafts"
Coal Mine Safety Production Law
"Technical Practices for Coal Mine Workers"
"Concrete Quality Control Standards" GB50164-92
"Steel Welding and Acceptance Regulations" JGJ18-96
Engineering Measurement Specification (GB50026-93)
"Safety Technical Specifications for Construction Machinery Use" (JGJ33-2001)
"Technical Specifications for Temporary Electricity Use at Construction Sites" (JGJ46-2005)
Fourth, the operation organization
1. Organization of the project department
The project department will increase the number of professional construction leaders, one professional engineer and one team leader, while ensuring that the original personnel are employed.
2, technical preparation
Prepare various technical preparations in advance. The drawings will be reviewed, measures prepared and approved to ensure the best construction plan.
3. Staff preparation
In view of the characteristics of this project, technical training and safety education will be carried out for the construction personnel who participate in the project before construction. The construction personnel are required to strictly follow the standard construction, do not mess with the work, carefully organize, scientific construction, strict construction discipline, improve various management systems, and ensure construction safety.
Project department follow-up leader: Shen Zhaowei
Construction manager: Huang Jiawei
Manager: 10 people in the project department, 2 full-time security supervisors
1 team leader, 3 squad leader
Ground construction personnel: 18 people (including steel workers, absent workers, formwork workers, laborers)
Ground support personnel: 5 people (including winch workers, signal workers, watch workers, cranes, etc.)
Other: electrician 2 person mechanic 3 person logistics 2 people
4. Construction main machinery and material preparation
5. Engineering construction specifications and quality acceptance criteria
The construction and quality acceptance of this project are mainly based on the following standards.
"Concrete Quality Control Standards" GB50164-92
"Steel Welding and Acceptance Regulations" JGJ18-96
6, construction site preparation
(1) Do a good job in communication and coordination with the mine party and the supervisor to ensure that the project is carried out normally.
(2) The full-time guards at the construction site shall be responsible for the safety of the wellhead.
(3) Do a good job of cleaning up the obstacles on the construction site, level the site, fully equipped with construction machinery and equipment, and prepare construction materials to ensure normal construction.
4. Preparation before the operation
1. Before construction, clean up the material and debris in the wellhead and wellhead within 20 meters and at the bottom of the well. Comprehensive inspection of electrical equipment to ensure that the electrical equipment integrity rate reaches 100%.
2. Before construction, clean the hydraulic special template for the construction wellbore and apply the template release agent. The personnel cooperated with the 25-ton automobile crane template and then hoisted into the wellhead, exposed 1.2 meters, and then used three stable vehicles to suspend the template firmly and horizontally fixed on the wellhead, making it used as the inner mold of the explosion-proof door foundation.
3. According to the design requirements: the inner and outer vertical ribs in the explosion-proof door foundation should be tied and connected with the steel bars in the lower well wall, and the lap length of the lashing is 42d. Therefore, before the construction, the construction workers first use the wind to blow the concrete at the wellbore 760mm, which is convenient for the connection of the steel bars. The surface of the concrete joint surface is chiseled to make the concrete have better connectivity.
4. Pre-buried anchor bolts, steel backing plates and pre-buried steel pipes are processed in advance.
5. The turnover materials arrive in advance, and the external template and support system are assembled and assembled.
6. According to the drawing design and the wellbore positioning control pile, draw the center line, embedded parts, pre-embedded bolts, oil injection holes and other position lines at the wellhead, and mark them with red paint.
V. Construction plan: 1. Template support:
Mold base using a dedicated template for construction of the primary wellbore, a combination of an outer steel template using the template, the template of the outer cross-purlin Φ18 using two steel vertical, vertical steel pipe scaffold purlin spacing 500mm, using # 8 iron wire lashing The diagonal support is fixed by steel pipe scaffolding and connected by fasteners.
The oil trough template is made of purchased δ30mm steel plate, each template is 1500×700mm, a total of 26 pieces are pressed out of the arc by the coiling machine, and the formwork support adopts 50×50 wood squares up and down two times, the spacing is 300mm, and is fixed by hanging mold. The lower part of the template is supported by a processed steel horse stool. The horse stool is made of Φ10 round steel, one for every 300mm, and the height of the horse stool is 280mm. A total of 65 pieces are made.
2, steel bar binding:
The length of the inner and outer vertical ribs is 1000mm, and the inner and outer ring ribs are laid out on site.
After the inner mold of the explosion-proof door foundation is set, the concrete at the wellhead is manually cut off by 760mm. The inner vertical ribs are first lapped and tied with the wellbore steel bars, then the inner ring ribs are tied, then the outer vertical ribs are lapped, the outer ring ribs are tied, and finally Bind the tie bars.
3. Concrete pouring:
After the acceptance of the steel bar and the formwork is confirmed, after confirming that all the embedded parts and the reserved holes are in the correct position, the concrete pouring instructions are issued by the supervisor and the concrete is poured. Before the concrete is poured, the foundation is washed away with high-pressure water, and the concrete is continuously poured and molded once.
Sixth, construction technical measures and construction quality control measures
1. Establish a sound quality inspection system, strictly implement the four-level joint inspection, and follow the general principle that “the next process is not qualified, the next process cannot be carried out†and “all three or more acceptance projects are passed onceâ€.
2. For the use of raw materials, product certification, quality certificate and re-inspection must be provided according to the specifications. If you need to replace the materials, you must perform the necessary procedures, and the design institute, the supervisor, and the project manager approve the approval.
3. The person in charge is responsible for managing the materials, collecting and sorting out raw material certificates, raw material reexamination records, concrete test records, various acceptance records, construction records, construction plans, and delivery. All materials must be complete when the work is completed, and the data should be synchronized with the actual work.
4. The specification, quantity and size spacing of steel bars should meet the design requirements. The surface of the steel bars is strictly prohibited from having quality defects such as oil stains, pitting, breakage, burns and scratches.
5. When concrete is poured, it must be vibrated carefully. It is strictly forbidden to have leakage and over-vibration.
6. When concrete is poured, the embedded parts and the pre-embedded bolts should be checked frequently for misalignment. The template is often observed for deformation. Once an abnormality is found, the correction is immediately corrected.
7. The formwork and its supporting structure must meet the requirements of bearing capacity, rigidity and stability. The template must be cleaned and evenly coated with a release agent before it is supported. The concrete can be removed by removing 70% of the design value above the design value.
8. The seam of the template plate should be covered with 10mm thick sponge strip. The sponge strip should be flush with the inside of the template to ensure that the seam depth is uniform and uniform, and the sponge strip should not be missed at the joint.
9. The concrete strictly controls the quality of the raw materials, strictly controls the water-cement ratio, and ensures the correct collapse of the concrete. Layered vibrating to ensure that the concrete is exposed to light. The tester is on-site monitoring and the test block is required according to the requirements.
10. Strengthen the storage management after the steel bar is fed, and do not damage the steel bar in any way. The binding and transportation production must conform to the requirements of the “Specificationsâ€, and the mortar pad is fixed on the outer side of the steel bar to ensure the uniform thickness of the steel protective layer.
11. The materials used in the project should have a product qualification certificate or a product performance test report. Re-inspection reports on the main properties of materials such as cement, sand and steel.
Seven, safety technical measures
1. The project department establishes a strong safety assurance system, hierarchical management, and safety indicators are decomposed into people, so that everyone has pressure and everyone has responsibility. Before the start of construction, the relevant personnel shall be inspected and appraised comprehensively and carefully for the construction equipment and machinery, and the unqualified equipment and machinery shall not be used.
2. All construction personnel must abide by the operating procedures and various rules and regulations; the construction personnel should wear the labor protection articles correctly when entering the construction site and during construction. The construction site must be provided with obvious warning signs and signs; all participating construction personnel must wear safety when entering the site. Cap; safety equipment (insulated gloves, insulated shoes, insulated handle tools, high-voltage electroscopes, etc.) can only be used after being tested by insulation test, and equipped in place; power management must be standardized, grounded well, dedicated maintenance, lock management, And set a warning sign.
3. All personnel involved in the construction must obey the command and obey the leadership. They must strictly abide by the labor discipline. They are not allowed to drink alcohol before the class, and they are not allowed to play in the class. The construction manager and the team leader must inspect all safety devices before construction every day, and work only when they are confirmed.
4. Strengthen safety education, including safety ideological education, safety technology knowledge education, and train all construction workers. Special types of work must be certified. All construction personnel must seriously accept the inspection and supervision of the personnel of the relevant departments at the higher level.
5, before each class of work to open a safe meeting, the team leader to work on the same day, to implement the safety precautions of the day work; before construction, the debris on the derrick and around the wellhead and in the wellbore should be cleaned to avoid accidental scraping Touch or vibrate into the well to injure people; during construction, non-workers near the upper and lower wellheads shall not approach or stay, and a simple fence shall be placed around the wellhead and hazard signs shall be hung.
6. When using fire welding for 20 meters away from the wellhead, it is necessary to strictly implement the fire prevention measures formulated by the mine. The construction area is equipped with fire sand and dry powder fire extinguishers, and the fire control can only be used after approval by the Safety Supervision Department.
7. All participating construction personnel, if any safety hazards are found, should report in time and deal with them in a timely manner to prevent all illegal operations and illegal conduct.
8. Before the start of construction, the construction personnel should conduct a comprehensive inspection of the entire wellbore, completely remove the attachments from the wellbore, and focus on the inspection of the wellbore to see if there are any security threats and hidden dangers in order to take countermeasures.
9. The welding personnel shall operate in strict accordance with the operating procedures of the welder.
10. During the construction process, the person in charge of the construction shall carefully check the operation of the construction site and the implementation of the measures. Correct the violation of operating procedures and construction measures in a timely manner.
11. All participating construction personnel carefully study the construction measures and sign them before starting construction. Unlearned personnel are strictly prohibited from participating in the construction.
12. Other unfinished matters Strictly implement the relevant provisions of the "Safety Regulations for Coal Mines"
8. Construction period commitment and construction schedule measures
1. The construction period is 15 calendar days, and we promise to ensure that all work is completed within the specified period.
2, to ensure the duration of measures
1) Strengthen leadership. When construction, equipped with competent and experienced construction management personnel and engineering and technical personnel to participate in the construction, the organization will be rigorous, smooth and orderly, and the progress of the project will be carried out as planned.
2) Prepare various construction preparations in advance, including technology, personnel, machinery, machinery, materials, construction site and coordination to ensure the smooth progress of the project.
3) Scientifically and rationally arrange the construction sequence and cross-flow between the processes, make full use of the effective working time, and shorten the construction period as much as possible.
9. Adopt new technologies, new processes, new equipment and measures to reduce engineering costs:
l, break the boundaries of the work, a special multi-energy, reduce work, balance production, reduce peaks, use regional advantages, convenient staff transfer, key processes, key assault.
2, in terms of materials, strengthen procurement management plan, are provided for the purpose of gold advantage to reduce costs, strengthen material management, rational use of materials, recycling of scrap materials reinforce and strengthen a project pass rate quality, reduce material consumption.
3, machinery and equipment, etc., reasonable scheduling, unified arrangements, overall consideration, improve the utilization rate and utilization rate of machinery and equipment, to achieve the purpose of reducing costs.
4. Make full use of your own energy.
5. Strengthen the construction site management, do a good job in anti-theft and security, and prevent the loss and waste of materials.
6. Strengthen organizational management and coordinate preparation work to ensure continuous production, grasp safety, ensure quality, and promote construction period, and reduce overall construction cost with scientific management.
X. On-site civilized construction management measures:
1. All kinds of materials and mechanical tools on the construction site must be stored according to the approved construction plane and placed neatly.
2. The project civilized construction adopts the district-responsible management method, which divides the site into the civilized construction management responsibility area, clarifies the responsible unit and the responsible person and adjusts in time according to the progress of the project.
3. The construction site is designed to keep the site clean and hygienic. Implement the system of “Who is doing the work, clearing the work, clearing the work, and clearing the site†to ensure that the construction site is clean and orderly.
4. Set up cleaning personnel at the construction site to be responsible for the sanitation, cleaning and finishing of public places and public facilities.
5. The person in charge of the electromechanical department of the project department will lead the full-time staff to make unified planning and layout of the site power supply and make reasonable wiring.
6. Set up a classified “waste bin†on the construction site to classify and store various wastes, and clean them regularly by cleaning personnel. It is forbidden to burn garbage on site.
7. All kinds of waste generated by the construction shall be recycled by each construction team, and the classification shall be placed in the waste container in a centralized manner, and the regulations of the mining party shall be strictly implemented in the process of stacking and transportation.
8. In the equipment that has been installed in place, use plastic cloth, adhesive paper, etc. to seal the equipment to ensure that it does not cause secondary pollution to the equipment and the environment.
9. When the construction personnel leave the construction site at the end of the work, they will finish the work, finish the materials, and clear the site.
10. The special dangerous operation area shall be provided with warning lines and warning signs, and a reliable protective isolation layer shall be set up strictly according to the “Safety Regulationsâ€. The safety facilities shall be ensured during the construction process; the temporary facilities in the construction area shall be recovered in time after the completion of construction.
XI. Fire fighting measures
1. Firefighting work must be included in the important agenda of on-site management, strengthen leadership, improve organization, strict system, and regularly carry out fire inspections and rectify hidden dangers.
2, construction electricity, temporary facilities to be standardized, especially the construction of wires and cables must not have leakage.
3. The combustible gas and combustion-supporting gas for construction, such as acetylene and oxygen, should not be piled up indiscriminately. Fire-fighting equipment should be equipped according to the relevant provisions of the construction site. Specialized management of inflammable and explosive materials should be set up, and the position of electric welding and gas welding should be strictly controlled. If the construction needs to use electricity or fire welding, it is necessary to go through relevant procedures with relevant departments, do isolation measures, and equip fire equipment according to relevant regulations.
4. After the electric and fire welding operations are completed, the residue is removed, and the designated person is allowed to observe on the spot. No abnormal phenomenon can be left, and the abnormality is detected in time.
5, oxygen, acetylene, flammable materials, should be stored separately, with obvious signs, and equipped with fire extinguishers.
Hydraulic system: The pumping hydraulic system adopts dual-pump dual-circuit constant-power open-loop hydraulic system and German Rexroth oil pump.
The main cylinder and swing cylinder are driven by two pumps separately. The swing cylinder features quick and powerful motions. The hydraulically controlled reversing mode guarantees more reliable and stable reversing motions for the main pumping line.
• Pumping system: The maximum capacity of the hopper is up to 800L and the inner walls of hopper adopt arc-shaped design to eliminate dead spaces for material deposits. The high wear-resistant wearing plate and cutting ring sufficiently cut down the user`s operating cost. The S-pipe valve features low height difference and achieves smoother concrete flow.
• Electronic control system: The main electronic control units adopt originally imported products, featuring simple system, low unit number, and high reliability.
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