Exploration of construction organization of mechanical and electrical installation projects in coal mines?

Foreword

In the construction of large and medium-sized coal mines and the technological transformation of production coal mines, coal mine mechanical and electrical installation engineering is an important part of modern coal mine construction. Relying on the research on modern construction safety management and fully implementing the safety production policy of "safety first, prevention first, and comprehensive management" is the core of improving the safety guarantee level and disaster prevention and resilience of electromechanical equipment installation projects during modern mine construction. In order to achieve the goal of construction and production safety of mine mechanical and electrical equipment installation projects.

1 Introduction to electromechanical installation projects in coal mines

1.1 The importance of electromechanical installation projects in mine construction

The electromechanical installation work that must be completed when the mine is completed and handed over includes: : Mine lifting, transportation, ventilation, drainage, water supply, power supply, communication and other systems; various facilities and administrative welfare facilities for production and life services of the above-ground production system are put into use; underground first mining working face has tunnel engineering for coal extraction, The mine's raw coal production system will be built; the installation of corresponding equipment and pipelines above and below the mine will be completed; at the same time, environmental management, fire protection, safety and other engineering facilities will be built simultaneously with the mine and meet standard requirements. The handover standards are: the construction of tunnels and civil engineering works of each major system has been completed, and the inspection quality has met the requirements; the installation and debugging of mechanical and electrical equipment has been completed; the production systems above and below the mine have been fully formed; ventilation safety facilities and safety equipment have all been completed and passed the acceptance inspection.

After joint trial operation and trial production assessment, the entire mine meets the requirements of corresponding laws and standards. The production capacity of each system and link meets the design requirements, and is handed over to production after passing the acceptance inspection. It can be seen that the safe operation of the mine's mechanical and electrical equipment is a necessary condition for the mine to be put into production. At the same time, the integrity of the installation of the mine's mechanical and electrical equipment determines the output efficiency, safety and modernization of the mine after it is put into production. The mechanical and electrical equipment installation project is one of the three major types of projects in mine construction, including mining construction, civil construction, and installation. Therefore, the installation project of mine mechanical and electrical equipment plays an important role in the construction of modern coal mines.

1.2 The relationship between electromechanical equipment installation engineering and other projects

Coal mine construction is characterized by joint operations on the ground and underground, and the three types of projects, namely mining construction, civil engineering, and electromechanical installation, are intertwined with mine supporting projects. , there are many external collaborative units, and the construction organization and construction technology are complex. It is very important to carefully study and optimize the construction plan and reasonably arrange the construction sequence of the three types of projects to speed up the construction of the mine and shorten the construction period. The relationship between the mine electromechanical equipment installation project and other project construction is as follows: 1) The third category of projects should be based on the tunnel project, and the construction time of the civil engineering and electromechanical installation projects should be reasonably arranged around the tunnel project, and each production system should be formed in a timely manner; 2) There are installation The construction of tunnels and civil works of the project should be prioritized so that they can be transferred to installation construction as soon as possible; 3) The tunnel projects should be the main ones, and the mechanical and electrical installation should be subject to the construction period of the tunnel projects. The civil engineering projects, except those related to underground engineering, should be subject to Regarding the construction period of electromechanical installation projects, in addition to being subject to the construction period of well and tunnel projects, electromechanical installation projects and civil engineering projects should also try to take into account the balanced use of labor; 4) Pay close attention to the construction of projects on key lines, and reasonably arrange the construction sequence and projects. Progress;

5) The construction arrangement of the three types of projects should follow the principle of highlighting key points and taking into account the general. On the premise of safe production, make full use of time and space to carry out parallel and intersecting three-dimensional operations of the three types of projects, and rationally arrange the labor force , balanced construction. Mine construction is generally based on the development and mining layout of the mine, scientifically comprehensively queuing the three types of mine projects, and determining the key lines and construction period of the mine construction project [1]. The construction method of mine projects is generally that the construction unit signs a project construction contract with the winning supervision unit and the engineering construction unit of each unit through fair competition bidding, and the contract stipulates the responsibilities and obligations of both parties. During the entire well construction period, the construction unit must grasp the main contradictions in the mine construction, reasonably arrange and coordinate the construction progress of each construction unit, and the supervision unit must strictly control the construction quality, especially the acceptance of hidden projects; problems arising during the construction shall be handled by the construction unit , the design, supervision and construction units all work together to solve the problem through consultation, so as to keep the construction of the construction unit as continuous, stable and balanced as possible.

2 The goals of the electromechanical installation project and the construction organization and deployment

Scientific construction organization management and deployment are important means to ensure the smooth realization of the project goals [2], and are an integral part of the project realization. The process is all-round and comprehensive planning, which mainly includes the establishment of project organization structure, construction period, quality, cost, safety, civilized on-site construction, planned allocation of resources, orderly management of the general plan of the construction site, and the effective application of advanced construction technology.

2.1 Goals of the Mine Mechanical and Electrical Equipment Installation Project

Goals of the Mine Mechanical and Electrical Equipment Installation Project [3]: All the above- and below-the-mine production systems are formed, installation and debugging are completed; ventilation safety facilities and All safety equipment has been completed and accepted. The mine's lifting, transportation, ventilation, drainage, water supply, power supply, communication and other systems are formed and operating normally; various facilities and administrative welfare facilities for production and life services of the above-ground production system are put into use; the first underground mining face is completed and the mine's raw coal production system; complete the installation engineering quantities of corresponding equipment and pipelines above and below the mine; the entire mine has undergone joint trial operation and trial production assessment, and complies with the corresponding regulations and standards. The production capacity of each system and link meets the design requirements, and is handed over to production after passing the acceptance inspection. .

2.2 Construction plan of the mine mechanical and electrical equipment installation project

Before construction, it is necessary to prepare a general design of the construction organization of the mine mechanical and electrical equipment installation project [4]. The overall design of the construction organization determines the reasonable construction sequence, construction methods, labor organization and technical and economic organization measures, coordinates the progress plan of the project; proposes the configuration plan and use sequence of manpower, materials, machines and equipment, and reasonably plans and arranges the construction On-site, it also guides the entire process of project construction and is the main basis for fulfilling construction contracts, handling various disputes, and preparing project budget settlements. During the construction period, the construction organization design and construction plan must be prepared in stages, parts, and areas of work, and the construction sequence and work handover must be reasonably arranged to avoid unreasonable overlap of processes and quality problems. All contents of the construction organization design should be disclosed to the main construction personnel, and intermediate inspections and adjustments should be made to the implementation compliance and effectiveness of the construction organization design. Before the construction of complex, special operation projects and important units, special construction organization designs need to be prepared to guide and restrict the construction process of special projects.

2.3 Construction Organization Arrangement and Deployment

The construction of mine mechanical and electrical equipment installation projects shall be organized, deployed and arranged by the installation company and the construction project department according to construction needs. The personnel and mechanical equipment required for construction shall be planned and prepared by the installation unit in advance according to the construction schedule and actual construction needs, and can enter the factory at any time to meet the construction needs. The key to the use of human resources is to clarify the responsibility system so as to mobilize enthusiasm, unleash potential and improve labor efficiency. Today's human resource management focuses on labor force dynamic management and labor outsourcing team management.

2.3.1 Labor organization and equipment The mine industrial square construction site project department is mainly equipped with project managers, deputy project managers and project chief engineers. The management personnel of the project department are construction workers (including special types of work), material workers, safety workers, document workers, and quality workers. They must hold certificates to work. Among them, employees in special operations of mechanical and electrical engineering must have safety technical knowledge of the corresponding type of work, participate in the safety technology theory and practical operation assessment prescribed by the state and pass the examination, and obtain a special operation operation certificate. The labor force for the electromechanical installation project of the mine project shall be arranged and deployed according to the needs of the project. According to the actual characteristics of the mine mechanical and electrical installation project, combined with the installation project’s previous experience in constructing this type of project, the installation company and the construction site project department will organize the internal human resources to select the best, and select the ones with strong professional and technical qualities, and the best performance in terms of construction period, quality, A construction team with reliable safety guarantees will be responsible for the construction tasks of this project.

2.3.2 Operational form Due to the large number of unit projects in mine mechanical and electrical equipment installation projects, the construction volume is large and the construction period is short. Depending on the actual conditions at the construction site, the forms of construction operations vary widely, but the operations of each individual project require specific operating methods based on the characteristics of the project. Based on the entire mine construction and construction experience, a more scientific and economical construction operation form is introduced below. The construction plan is as follows: the mine electromechanical equipment installation project is divided into two independent operating systems, the ground and underground. The two will be constructed at the same time, and the construction plan and construction plan will be formulated.

The ground installation project and underground installation project, and each unit project to which they belong will be constructed according to three operation methods: centralized operation, parallel operation and special operation. According to the construction content, the construction will be carried out in three shifts, two shifts or single shift to ensure the construction progress. and the achievement of construction goals.

3 Coal mine electromechanical equipment installation and construction process control management

3.1 Construction quality management

The construction of the entire coal mine electromechanical equipment installation project shall be the responsibility of the unit project construction leader in advance Management[5]. Implement quality planning and various technical measures, be responsible for presiding over the re-evaluation of each process, be responsible for handling various quality incidents, and strictly follow the coal mine mechanical and electrical equipment installation and construction specifications and the company's "Technical Standards", "Quality Manual" and "Procedure Documents" for construction , summarize the construction status of each type of work team, and report the construction quality status in a timely manner. Before the construction of the electromechanical equipment installation project, complete technical plans for divisions, sub-projects or majors must be prepared, and a quality inspection plan for the coal mine electromechanical equipment installation project shall be formulated to facilitate quality control.

For example: In the underground electromechanical installation project of Mengtai Buliangou Mine in Inner Mongolia, China Coal First Construction Company first determined the project scope, construction methods and construction technical requirements, and determined that all unit projects must meet Qualified engineering quality standards. In the installation project of transformer cabinets and low-voltage cabinets in the underground 10KV substation and distribution room, the following strict requirements were made on the construction quality: 1) Cabinet top straightness: the tolerance for two adjacent cabinets is 2mm, and the tolerance for a row is 5mm; the flatness of the cabinet surface : The tolerance for two adjacent cabinets is 1mm, and the tolerance for a row is 5mm. The verticality of the cabinet should be less than 2/1000 of the panel height. 2) The installation position is correct, the fixation is firm, the parts are complete, the operating part is flexible, the opening and closing instructions are correct, the locking protection device is complete and reliable, the oil level is correct, and there is no oil leakage phenomenon, and conduct routine electrical tests as required. The above quality standards are implemented by the construction team leader of the project, and the quality review is conducted by the main person in charge of the construction company.

3.2 Construction Safety Management

Coal mine mechanical and electrical equipment installation projects should establish a safety construction system with the main person in charge, and project branches at all levels should be equipped with full-time safety technology and management personnel. For example: China Coal First Construction Company established a safety production leadership group with the project manager as the first responsible person in the electromechanical installation project of the Buliangou Mine Project, and established a safety responsibility system for all departments at all levels; the project department set up a safety deputy The manager is responsible for the specific safety management work of the project department. The project department has full-time safety inspectors and the team has part-time safety inspectors; establish a regular safety inspection system and adhere to daily, weekly, ten-day and monthly inspection systems. The safety management goals of "six no's, one control, and one realization" are determined, that is, no personal death accidents, no major equipment damage accidents, no major fire accidents, no major responsible traffic accidents for which the company is primarily responsible, and no Serious environmental pollution accidents, large-scale infectious diseases and collective food poisoning accidents will not occur, serious injury accidents will be strictly controlled, safe and civilized construction will be achieved, and infrastructure will be put into operation up to standard.

3.3 Construction progress control

The overall plan and arrangement for the construction of coal mine mechanical and electrical equipment installation projects should be prepared by the owner or the general contractor entrusted by the owner, but must obtain the approval of the owner. The overall construction plan must be informed to all subcontracting units participating in the construction. Each subcontracting unit shall prepare the overall progress plan or annual construction progress plan for the unit project or individual project it undertakes according to the overall plan. The prepared plan must comply with the construction period objectives stipulated in the contract. requirements and submit them to the general contractor for review and confirmation. For example: China Coal No. 1 Construction Company undertakes the mechanical and electrical equipment installation and construction project of Hulusu Coal Mine. The overall planning arrangement for the construction should be compiled by Hulusu Coal Mine or Hulusu Coal Mine entrusts China Coal No. 1 Construction Company. The compiled plan should be obtained from Hulusu Coal Mine. recognition. The overall progress plan of mechanical and electrical engineering construction should be arranged in the order of production process flow. Classification according to the length of construction time: annual, quarterly, monthly, ten-day or weekly construction schedule. Classified by project: overall progress, unit project progress, and sub-project construction progress plans.

3.4 Cost Control

The main stages of cost control [8]: 1) Cost control during the project bidding stage: Project cost control is carried out based on the project overview and bidding method; 2) Construction preparation Phase cost control: Combined with construction drawings, design disclosure, and drawing review, through technical and economic comparison, select an economical, reasonable, advanced and reliable construction plan, prepare a detailed and specific cost plan, and control project costs in advance.

3) Cost control during the construction phase: Control the actual costs incurred based on construction drawing budget, labor quotas and expense standards. 4) Material cost control: adopt quota collection, strictly control the loss rate of materials, and strictly prohibit waste. 5) Labor cost control: Determine the on-site personnel deployment and entry and exit times based on the number of labor required, the rationality of the type of work allocation, and the construction schedule. During the construction process, it will be cashed according to the completion progress and physical quantity of the project, and it will be strictly controlled according to the total approved labor cost. 6) Construction machinery cost control: Arrange the use of machines according to the types and quantities specified in the construction plan and construction technical measures. Control the use of large-scale construction machinery shifts and improve the efficiency of on-site construction machinery and tools. 7) Completion delivery and warranty stage: Control the expenses and warranty expenses incurred during the completion acceptance process.

3.5 On-site civilized construction management

In order to ensure civilized construction and standardized management of the project, according to the JGJ59-2011 Construction Safety Inspection Standard [9] issued by the Ministry of Construction and the provincial and municipal regulations Several regulations on civilized construction at construction project sites and relevant regulations of the company, combined with the on-site conditions of the coal mine electromechanical equipment installation project, require all employees of the project department and all personnel at the construction site to abide by the requirements of the current civilized construction rules and regulations to provide favorable conditions for production. conditions and provide a convenient and hygienic living environment for employees. The requirements for civilized production management during construction are: various equipment, components, and materials should be placed neatly and orderly, and signs should be hung; electrical equipment should be kept, maintained, and managed by designated personnel to ensure that the equipment works in good condition.

The above is collected and compiled by Zhongda Consulting

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