1. What are the key points in the management of concrete mixing stations
With the changes in national policies, the supervision of concrete mixing stations has been strengthened to improve their competitiveness. Occupying a place in the future market requires good management. The main points of concrete mixing station management are as follows:
1. Staffing management
Staffing is very important for the mixing station, both To ensure normal production and employment without causing wastage of personnel, different job categories are set up and different number of people are allocated according to the scale of the concrete mixing station.
2. Equipment management
For concrete production, the mixing station is the largest equipment, and all production activities revolve around the mixing station, so , equipment management is very important. To ensure the normal operation of the machine, regular maintenance is required. At the same time, it is necessary to master certain mixing station maintenance techniques, so that minor problems will not require help, and major problems will not delay things.
3. Production management
Concrete production requires the coordination of various departments, from obtaining sales orders to issuing production tasks to the production department. The laboratory issues relevant mix ratios, mixing From the time the station operator inputs the production task to start production, until the concrete arrives at the construction site, multiple departments need to communicate. Once any mistakes occur in the intermediate links, irreversible problems will occur.
4. Fleet management
Many mixing stations have their own fleets, including mixer trucks and pump trucks. These two vehicles are used for concrete transportation and construction. Therefore, fleet management needs to develop an effective system. To improve the production efficiency of the entire mixing station, mixer truck drivers are required to transport concrete to the construction site on time. At the same time, daily maintenance and repair of the vehicles are also required. close.
5. Scheduling management
Many times, several construction sites are constructing at the same time. If the number of mixer trucks is limited, however, in order to ensure that all construction sites can proceed effectively Construction requires scheduling to make the most efficient dynamic management. At the same time, it is also necessary to make a rough plan for the mixing station and driver’s work the next day to ensure orderly production and transportation.
6. Internal process management
From receiving orders from the production department to making production plans, output ratios, concrete production, and arranging vehicles Scheduling and other entire link flowThe process must be smoothed out to avoid project delays due to process problems.
II. Concrete Mixing Station Management Plan
In order to strengthen the management of commercial concrete mixing stations and improve the quality of ready-mixed commercial concrete products, according to the “Construction Project Quality In accordance with the “Management Regulations” and commercial concrete standards, this management plan is formulated:
1. The project manager is the first person responsible for the product quality of the concrete mixing station. The project manager can appoint a management representative to be solely responsible for quality management, and the technical person in charge is responsible for specific management of product quality under the direct leadership of the project manager or management representative.
2. The project should select qualified suppliers with corresponding qualifications according to quality control requirements, and raw materials without licenses shall not be purchased. Establish and maintain files of qualified suppliers; purchase contracts should be reviewed and approved to ensure that the purchased raw materials meet specified requirements; the supply department should organize balanced purchases in strict accordance with raw material quality standards.
3. The quality of raw materials must comply with current standards, specifications and regulations. Projects must accept quality certification materials by batch and reject raw materials with incomplete quality certification materials. After the raw materials enter the site, they must be sampled and inspected in batches in accordance with the “Technical Regulations for the Production of Ready-Mixed Commercial Concrete”, adhering to the principle of “inspection first, then use”, and unqualified raw materials are not allowed to be used. Projects should implement classified management of incoming materials.
4. The project and raw material production and supply units must jointly take samples and seal them when the materials come into the site. The number of sealed samples should be able to meet the needs of testing. The seal should indicate the name of the production company, sample number, sample variety, Specifications, production date, batch number and representative quantity, and storage date. The samples shall be sealed after being signed or sealed by both the management representative of the project and the manufacturer of the supplied materials or a person authorized by the manufacturer in writing. The seal sealing the sample should be intact and not broken or replaced. Storage time of sealed samples: cement should comply with relevant national regulations, sand and gravel materials should be no less than 5 days, fly ash and mineral powder should be no less than 7 days, and admixtures should be no less than 10 days.
5. Raw materials should be stacked or stored separately according to varieties and specifications, and marked with eye-catching signs to avoid confusion.
6. The project should maintain a reasonable raw material storage amount based on the difficulty of raw material preparation and on the premise of ensuring normal production.
7. The mix proportion design of commercial concrete must comply with the “Commercial Concrete Mix Proportion Design Regulations” (JGJ55), “Commercial Concrete Strength Inspection and Assessment Standards” (GBJ107), and “Commercial Concrete Quality Control Standards” (GB50164 ) and other relevant standards and regulations.
8. The mix proportion of commercial concrete for production must be tested in the laboratory, and trial mixing records and other relevant information must be available. The project should reserve a certain amount of commercial concrete mix proportions and related information based on the actual production conditions, which may include: different commercial concrete strength grades, different slumps, different cement varieties and strength grades, different aggregate particle sizes or fineness molds Number, different types of admixtures, etc.
9. During use, the mix ratio of commercial concrete should be adjusted in a timely manner based on dynamic information on the quality of commercial concrete and changes in raw materials, and records should be kept.
10. When mixing commercial concrete, the relevant requirements of the commercial concrete mix ratio notice must be strictly followed. The commercial concrete mix proportion notice should include the production date, project name, commercial concrete strength, slump, commercial concrete mix number, name, variety, specification, mix ratio of raw materials and the actual amount of raw materials used per cubic meter of commercial concrete, etc. content. When various changes that occur during the production process require adjustments to the commercial concrete mix ratio, a dedicated person should also be responsible and re-issue the commercial concrete mix ratio notice or mix ratio adjustment record.
11. Commercial concrete measurement, mixing, and slump inspection records should be complete. It should include the date, commercial concrete mix ratio notice number, raw material name, variety, specification, standard value of raw material weighing for each plate of commercial concrete, actual quantity, deviation, mixing time, and slump.
12. The quantity of raw materials used to mix commercial concrete should comply with the provisions of the commercial concrete mix ratio notice, and the allowable measurement error of raw materials should comply with the regulations.
13. The actual weighing of various raw materials used in mixing commercial concrete should be recorded plate by plate.
14. The minimum time for commercial concrete mixing should comply with the equipment instructions.
15. The main equipment for the production of ready-mixed commercial concrete must comply with the provisions of “Technical Conditions for Commercial Concrete Mixers” (GB9142) and “Technical Conditions for Commercial Concrete Stations (Buildings)” (GB10172).
16. Measuring instruments must be regularly verified (or calibrated) by the legal metrology department in accordance with regulations. Measuring instruments must be re-verified after undergoing intermediate repairs, overhauls or relocation.
17. Measuring instruments should be statically measured and calibrated by the project measurement department in accordance with regulations, and records should be kept.
18. The project measurement department should strengthen daily inspections of measuring instruments, deal with problems in a timely manner, and keep records.
19. Before weighing in each work shift, the measuring equipment should be zero-point checked and records should be kept.
20. The sampling, specimen production, maintenance and testing of commercial concrete must comply with the current national standards GB/T50080 “Standard for Test Methods of Performance of Ordinary Commercial Concrete Mixtures” and GB/T50081 “Mechanics of Ordinary Commercial Concrete” Performance Test Method Standards” and GB50204 “Code for Construction Quality Acceptance of Commercial Concrete Structural Projects”.
21. The inspection and assessment of the strength of commercial concrete must comply with the relevant provisions of the current national standard “Standard for Inspection and Assessment of the Strength of Commercial Concrete” (GBJ107).
22. The consistency deviation of commercial concrete mixtures should comply with the design of commercial concrete mix proportions and the provisions of “Ready-mixed Commercial Concrete” (GB14902).
23. Commercial concrete mixThe gas content, total chloride content and other quality indicators of the compound shall comply with the provisions of the “Quality Control Standard for Commercial Concrete” (GB50164), and the inspection frequency shall be implemented in accordance with the contract.
24. Commercial concrete with impermeability requirements should undergo an impermeability test.
25. The inspected test pieces (commercial concrete, cement) should be kept for three days before being processed.
26. Treatment of unqualified commercial concrete: When there is doubt about the representativeness of the strength of commercial concrete specimens, non-destructive inspection methods can be used to inspect the commercial concrete in structures or components according to relevant standards. The strength is estimated. Structures or components made from unqualified batches of commercial concrete should be identified, and unqualified structures or components must be dealt with in a timely manner.
27. Responsibilities of the project manager in quality management of the mixing plant: ensure the implementation of appropriate processes to meet project requirements; ensure the establishment, implementation and maintenance of an effective quality management system to achieve goals; ensure the acquisition of quality and Resources necessary for safety requirements; compare achieved results with specified goals and determine improvement measures.
28. Responsibilities of quality management personnel: implement the company’s quality policy and goals; determine project needs and expectations; determine the processes and responsibilities necessary to achieve the company’s quality policy and goals, and organize their implementation; according to product quality Requirements: design the mix ratio of commercial concrete, formulate internal control quality indicators for raw materials, production processes and finished products, strengthen process control, use scientific statistical methods to grasp the law of quality fluctuations, and continuously improve predictability and prevention capabilities; supervise and inspect the production process to keep it in a Under control, take corrective and preventive measures to promptly reverse the quality out-of-control state, and review the entire process; be responsible for the analysis and handling of quality accidents, and report them in a timely manner.
29. Responsibilities of management personnel: quality inspection, sending raw materials and finished commercial concrete for inspection in accordance with project requirements and relevant standards and regulations; confirming and verifying raw materials entering the site and leaving the factory; strictly complying with contract requirements and Relevant standards confirm the arrival of raw materials and the departure of products from the factory, and delivery acceptance is carried out in accordance with relevant standards and the provisions of the contract between the supply and demand parties. Have the right to veto the entry of raw materials and the delivery of products.
30. Environmental management: The main roads on site and the sand and stone storage areas are hardened; on-site cement, fly ash, etc. are stored or tightly covered; the concrete and mortar mixing stations are closed; cement, sand When transporting materials such as dust and ash, they should be closed or tightly covered; effective dust-proof measures should be taken for on-site mixing equipment; dedicated personnel should be assigned to sprinkle water, reduce dust, and clean tires when entering and exiting the construction site, as well as shoveling, transporting, and unloading earthwork; operations should be arranged It will be carried out between 6:00 and 22:00. If continuous construction is required due to technical reasons such as workmanship, it must be approved by the construction administrative department and legal night construction procedures must be obtained. Adopt effective noise reduction measures for working floors in noise-affected areas. Strictly control unnecessary sources of man-made noise; with the approval of the municipal department, construction sewage shall be discharged into the municipal sewage pipe network and shall not be discharged into the municipal rainwater pipe network. Discharged rainwater and construction sewage,A secondary sedimentation tank should be set up at the exit, and the sedimentation tank should be cleaned by a dedicated person.
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