The tunnel concrete pavement adopts the entire construction technology of laser truss split roller paver

    Objective: To prevent safety accidents such as collapse, falls from heights, mechanical injuries, and electric shock during concrete pouring construction, ensure the safety of construction workers' lives and equipment and property, and standardize operation procedures, this special measure is formulated in accordance with regulations and standards such as the "Code for Safety Inspection of Construction Sites" (JGJ59) and the "Code for Construction of Concrete Structures" (GB50666). ​ Scope of application: This measure is applicable to various concrete pouring operations in building construction, municipal engineering, Bridges, tunnels, etc., including the pouring construction of different parts such as foundations, main structures, and secondary structures. ​ Before construction, a special construction plan should be prepared, clearly specifying the pouring sequence, material distribution method, machinery selection and safety protection requirements. It should be implemented after approval by the technical supervisor. ​ Conduct three-level safety briefings for all personnel involved in the operation: project-level briefing on the overall safety risks of the construction, team-level briefing on the operation norms of the positions, and on-site briefing on the potential hazards of specific operation points (such as edges, openings, and high-voltage line locations). The briefings must be signed for confirmation and archived. ​ Inspect the surrounding environment of the pouring area: Clear the debris on the work surface, and confirm that 1.2-meter-high guardrails have been set up at the edges (such as foundation pits, floor slab edges) and openings (with 20cm high toe boards at the bottom of the guardrails and an additional horizontal bar in the middle). The guardrails should be painted with red and white warning paint and hung with close-mesh safety nets. ​ Check the load on the working surface: Verify the bearing capacity of the formwork support system to ensure that the concrete stacking height does not exceed the specification requirements (the stacking height during floor slab pouring is ≤100mm), and prevent the support from collapsing due to overloading. ​ Check for electrical safety: Confirm that the distribution box meets the requirements of "one machine, one switch, one leakage protection, and one protection". The cables in the pouring area should be overhead or run through pipes for protection to prevent damage from being crushed. When working in a humid environment, the lighting voltage should be 36V or lower, which is a safe voltage. ​ Concrete conveying equipment (pump trucks, ground pumps, placing machines) : Check whether the braking system, hydraulic system and pipe joints of the equipment are in good condition. The outriggers of the pump truck need to be supported on a solid ground (with steel plates or square timbers as pads), and confirm that the outriggers are fully extended and the ground bearing capacity meets the requirements. ​ Protective supplies: Personal protective equipment such as safety helmets, anti-slip shoes, insulating gloves, and dust masks should be provided. When working at heights, safety belts (high hanging and low use) and operation platforms (fully covered with scaffolding boards and surrounded by guardrails) should be prepared. Backup emergency supplies (such as first aid kits, fire extinguishing equipment, and warning tapes). ​   High-altitude work protection: When the pouring height is ≥2 meters, an operation platform or scaffolding must be used. It is strictly prohibited to stand on formwork or steel bars for work. Workers should fasten their safety belts, and the hooks of the safety belts should be hung on solid structural components. It is strictly prohibited to walk on unfixed components. ​ Edge operation protection: When pouring foundation pits, slopes and other edge parts, set up warning areas and prohibit non-operation personnel from entering. Workers should maintain a safety distance of no less than 1 meter from the edge of the edge. Anti-slip scaffolding boards should be laid if necessary. ​ Dust-proof and heat-proof protection: During summer pouring, shading measures should be taken to prevent personnel from suffering from heatstroke. When pouring in winter, when hot water is used to mix concrete, it is necessary to prevent steam scalding. Workers should wear anti-scalding gloves. When there is a lot of cement dust, wear dust masks and set up spray dust suppression equipment on site. ​ Operation precautions for pump trucks and material distribution machines: No one is allowed to stand within the rotation radius of the material distribution rod of the pump truck. Before operation, make sure there are no high-voltage lines or obstacles within the rotation range. The placing machine should be firmly fixed. Before use, check whether the outriggers and the rotating mechanism are locked. It is strictly forbidden to carry out pouring operations when the placing machine is in motion. ​ Vibrator usage protection: The operator of the vibrator should wear insulating shoes and insulating gloves. The cable of the vibrating rod should be protected from damage. It is strictly forbidden to drag the cable. When vibrating, avoid touching the steel bars and formwork to prevent the vibration rods from bouncing and injuring people. When the vibrator is not in use, cut off the power supply and place it in a dry area. ​ Concrete transportation protection: When transporting concrete by tanker, the driver must abide by traffic rules. No one is allowed to stand under the unloading port of the tanker. The ground pump conveying pipeline is firmly fixed. Check the sealing condition of the pipeline joints to prevent concrete leakage and spraying from injuring people. When replacing the pipeline, first turn off the power of the ground pump, release the pressure, and then disassemble it. ​ During the pouring process, dedicated personnel should be assigned to monitor the formwork support system, with a focus on checking the verticality of the vertical rods, the spacing of the horizontal rods, and the setting of the sweeping rods. If any deformation of the vertical rods or loosening of the horizontal rods is found, the pouring should be immediately halted, and personnel should be organized to evacuate. Work can resume only after the reinforcement and rectification are completed. ​ The pouring sequence follows the principle of "symmetrical pouring and layered pouring" to avoid instability of the support system due to excessive local loads. The thickness of the layered pouring shall be carried out in accordance with the specifications (generally ≤500mm), and it is strictly prohibited to pour the formwork in a centralized manner at one time to avoid deformation. ​   Regular maintenance and servicing of concrete conveying equipment, vibrators and other machinery should be carried out. The operating status of the equipment should be recorded. If any fault is found, the machine should be stopped immediately for repair. It is strictly prohibited to operate with faults. Mechanical operators must be certified and familiar with the equipment operation procedures. Unlicensed personnel are strictly prohibited from operating. ​ When the pump truck is in operation, a dedicated person should be assigned for command. The command personnel should use standard signals (flag language or walkie-talkies) to avoid communication errors with the driver. When the fabricating machine is moving, it should proceed slowly to prevent collision with structural components or personnel. ​ On-site electricity usage should be operated by professional electricians. It is strictly prohibited for non-electricians to connect or disconnect wires. The distribution box in the pouring area is locked and a warning sign saying "Beware of Electric Shock" is posted. There are no debris within 1.5 meters around the distribution box. ​ When working in rainy weather, cover the distribution box and electrical equipment, and check the grounding resistance (grounding resistance ≤4Ω) to prevent leakage accidents. After the operation is completed, cut off the power supply of all equipment, organize the cables, and avoid crushing or soaking them. ​   Collapse accident handling: In the event of a collapse of the formwork support, immediately stop the operation, organize personnel to evacuate to a safe area, and prohibit blind rescue. Call the 120 emergency number and at the same time use excavators, jacks and other equipment to clear the collapsed objects and rescue the trapped people to prevent secondary collapse. ​ Handling of falls from heights and mechanical injuries: In the event of a person's fall or mechanical injury, immediately stop the operation, transfer the injured person to a safe area, check the injured person's consciousness and breathing. If fractures or bleeding occur, take temporary immobilization and hemostasis measures, and call 120 for medical treatment. In the event of an electric shock accident, cut off the power supply first, then rescue the injured person to prevent the rescuers from getting electrocuted. ​ Fire accident handling: In case of fire caused by electrical faults or flammable materials burning, immediately cut off the power supply, use on-site fire extinguishing equipment to put out the fire, evacuate people to a safe area, call 119 to report the fire, and at the same time clear flammable materials around to prevent the fire from spreading. ​   Daily inspection: Before each day's work, the team conducts a pre-shift safety inspection, with a focus on personal protective equipment, equipment status, and protective facilities. The project organizes safety inspections every week to identify potential hazards and issue rectification notices, and follows up on the rectification progress. ​ Special acceptance: Before pouring, a special acceptance shall be conducted on the formwork support system, operation platform and electrical equipment. Only after the acceptance is qualified and signed for confirmation can the pouring operation begin. If the acceptance is not qualified, construction is strictly prohibited until the rectification meets the standards. ​ Safety education and training should be provided to newly arrived workers. Only after passing the assessment can they take up their posts. Regularly organize special training on concrete pouring safety, explaining accident cases, operation norms, and emergency skills to enhance personnel's safety awareness. ​ Special operation personnel (such as pump truck drivers, electricians, and scaffolders) must hold relevant certificates to work. Those with expired certificates or those that have not undergone annual review are prohibited from engaging in related operations. Regularly organize refresher training for special operation personnel to update their safety knowledge. Instructions for Use: This plan is a general template. Before the specific implementation of each project, it should be refined and supplemented according to the characteristics of the project (such as super-high, super-heavy, large-span structures, etc.), especially the control measures for major hazard sources.    

The fuel tank of the laser leveling machine is also an important part. It is used to support the action of the equipment. If there is no fuel tank, the equipment still cannot move normally. It is as important as the engine. Many users will be concerned about the fuel tank when using it. There are a lot of questions about cleaning. When cleaning, we should be careful not to wash off the protective film in the fuel tank, which will affect the normal use of the equipment. 1. Why should the oil tank of the laser leveling machine be cleaned regularly? As the laser leveling machine is used longer, the precipitated impurities in gasoline will accumulate more and more in the fuel tank. These impurities first settle at the bottom of the fuel tank. When there are too many sediments, they will enter the car engine along with the fuel. severe wear and tear on the engine, As long as you clean the fuel tank once, the owners will find how necessary it is to clean the fuel tank regularly. During the cleaning process, not only particles, colloids, but even tin foil, plastic sheets and other incredible things will be washed out. The owner of the machine does not know how many things get into the fuel tank. If these wastes are not cleaned up in time, the impact on the engine of the laser leveling machine can be imagined. 2. How to clean the fuel tank of the concrete laser leveling machine? Fuel tank cleaning is divided into two steps, internal and external. When cleaning the engine fuel system, use the engine non-disassembly cleaning agent, because the non-disassembly cleaning agent does not need to disassemble the fuel system. On the one hand, it can start to clean the fuel system thoroughly. , On the other hand, it is beneficial to protect the fuel system of the engine. When cleaning, you can use a clean cloth to block the nozzle of the fuel pipe, and then change the position and direction of the plastic pipe to avoid rubbing the oil level sensor as much as possible. , to release gasoline, at this time the impurities in the gasoline will flow out together. It should be noted that the fuel released from the fuel tank should be used after 72 hours of precipitation. When cleaning the outside of the fuel tank of the laser leveling machine, it is necessary to check whether there is any depression or oil leakage in the fuel tank, oil pipes, joints, etc. Also check whether the fixing screws of the fuel tank bracket are tightened. When cleaning the inside, open the fuel tank port, take out the filter barrel, suck the oil out, and then insert the cleaned plastic pipe from the fuel filler port to the bottom of the fuel tank, and gently blow the bottom of the fuel tank gasoline, make it tumble to achieve the cleaning effect. The above are many questions about cleaning the laser leveling machine. You can learn more about it and it will help you. Secondly, you should pay attention to regular maintenance and maintenance when using it. This can also reduce the occurrence of equipment failures. Thank you Your attention and support all the time.

How to repair the cracking problem of emery floor caused by long-term wear? Emery floor is widely used in industrial plants, warehouses, parking lots and other places because of its wear resistance, pressure resistance and anti-slip properties. However, as time goes by, the surface of the floor will inevitably be worn, especially in high-traffic areas, where cracking problems often occur. This not only affects the aesthetics of the floor, but may also cause safety hazards and affect the use effect. Therefore, it is very important to repair the cracking problem of emery floor. ★ Problem Analysis and Causes ★ There are many reasons for the cracking of emery floor, among which long-term wear is one of the main factors. During the use of the floor, due to the frequent exchanges of vehicles, personnel, goods, etc., the surface of the floor is constantly rubbed and hit, causing the surface material to gradually wear and thin. When the wear reaches a certain extent, the structural strength and stability of the floor will be affected, resulting in cracking. In addition, factors such as floor construction quality, material quality, and use environment may also affect the wear resistance and cracking of the floor. For example, poor construction quality may lead to uneven floor surface, prone to wear and cracking; harsh use environment, such as frequent contact with chemicals or high temperature, will also accelerate the damage and aging of the floor. ★ Preparation before repair ★ Before repairing the cracking problem of diamond sand floor, you need to make adequate preparations. This includes the following aspects: 1. On-site investigation and evaluation: Conduct a comprehensive investigation and evaluation of the cracking of the floor to determine the scope, degree and cause of the cracking. At the same time, understand the use and environment of the floor to provide a basis for subsequent repair work. 2. Material preparation: According to the results of the on-site investigation and the repair plan, prepare the required repair materials, such as repair agents, curing agents, coatings, etc. Ensure that the quality of the materials meets the requirements and has good wear resistance and pressure resistance. 3. Tool and equipment preparation: Prepare the tools and equipment required during the repair process, such as grinders, vacuum cleaners, roller brushes, etc. Ensure that these tools and equipment can be used normally to improve the efficiency of repair. ★ Crack Repair Plan ★ For the cracking problem of diamond sand floor, the following repair plan can be adopted: 1. Cleaning and grinding: First, use a vacuum cleaner to clean the debris and dust in the cracked area to ensure that the surface is clean. Then, use a grinder to grind the cracked area to remove the loose layer and uneven parts of the surface to improve the adhesion of the repair material. 2. Filling the profile joint: For larger profile joints, special repair agents can be used to fill them. The choice of repair agent should be determined according to the material and use environment of the floor to ensure that it has good adhesion and good abrasiveness. When filling, apply the repair agent evenly in the crack to ensure that the filling is complete and flat. 3. Overall coating reinforcement: In order to enhance the overall strength and flatness of the floor, a layer of reinforcement coating can be applied to the entire floor surface. The choice of reinforcement coating should be determined according to the material and use requirements of the floor. You can choose a coating with wear-resistant, anti-slip and other functions. When applying, ensure that the coating is uniform and without omissions, and pay attention to avoid bubbling, cracking and other phenomena. ★ Curing and strengthening treatment ★ In order to improve the wear resistance and stability of the repaired floor, the floor can be cured and strengthened. Curing agent is a substance that can react chemically with the floor material to improve the hardness and wear resistance of the floor. After the repair work is completed, a layer of curing agent can be applied to form a hard and wear-resistant protective layer on the floor surface. Curing and strengthening treatment can further enhance the bearing capacity and service life of the floor. ★ Subsequent care and maintenance ★ After the repair work is completed, subsequent care and maintenance are equally important. Here are some suggestions: 1. Regular cleaning: Regularly use a vacuum cleaner or mop to clean the floor surface to avoid the accumulation of debris and dust. For stains that are difficult to clean, such as oil stains, professional cleaning agents can be used for treatment 2. Avoid heavy impact: When using the floor, avoid heavy objects directly hitting or scratching the floor surface to avoid damage to the floor. For high-traffic areas, protective pads can be set up or protective facilities can be installed to reduce wear. 3. Regular inspection and repair: Regularly check the cracking and wear of the floor, and deal with problems in a timely manner once they are found. For minor wear and cracking, you can use repair materials to repair; for larger problems, you can contact a professional team for repair. ★ Preventive measures ★ In order to avoid the problem of cracking of diamond sand floor again, the following are some preventive measures: 1. Improve the construction quality: During the construction process, strictly follow the construction specifications to ensure the flatness and construction quality of the floor. Pay special attention to the control of key links such as base treatment, material mixing ratio, and construction thickness) 2. Select high-quality materials: When selecting floor materials, you should pay attention to its performance in terms of wear resistance, pressure resistance, and stability. Give priority to brand products with reliable quality and stable performance, and avoid using inferior materials. 3. Reasonably plan the use environment: Reasonably plan the use environment according to the use needs and environmental characteristics of the floor. For example, set up a buffer zone in a high-traffic area or take other measures to reduce wear; take protective measures in areas susceptible to chemical invasion, etc. 4. Strengthen daily maintenance: Clean and maintain the floor regularly, and deal with minor wear and cracking problems in a timely manner. At the same time, strengthen daily inspections and maintenance work to ensure that the floor is in good use. In summary, repairing the cracking problem of diamond sand floor caused by long-term wear needs to start from multiple aspects. First, analyze and evaluate the problem to find out the cause and scope of the cracking; then, make preparations before repair, including the preparation of materials, tools and equipment; then, use appropriate repair solutions to treat the cracked area; finally, perform curing and strengthening treatment to improve the wear resistance and stability of the floor. After the repair is completed, it is also necessary to pay attention to subsequent maintenance and maintenance work, as well as take preventive measures to avoid similar problems from happening again. In the process of repairing the cracking problem of diamond sand floor, we also need to pay attention to the following points: First, safety is always the primary consideration. Before the repair work begins, ensure that the safety warning signs in the work area are in place to prevent unrelated personnel from entering the construction area. At the same time, construction personnel should wear appropriate safety protection equipment, such as gloves, masks, safety shoes, etc., to ensure safety during the construction process. Secondly, pay attention to the control of the construction environment. During the repair work, the construction area should be kept dry and clean as much as possible to avoid the influence of moisture and debris on the repair effect. At the same time, it is also crucial to control the construction temperature and humidity. Appropriate construction conditions should be selected according to the requirements of the floor material and curing agent. In addition, after the repair work is completed, a comprehensive inspection should be carried out to ensure that the repair area is consistent with the flatness and color of the surrounding floor. For the slight differences that exist, appropriate grinding and adjustment can be carried out to achieve an overall beautiful effect. Finally, the implementation of preventive measures is also crucial. In addition to improving the construction quality and selecting high-quality materials, the daily maintenance and management of the floor should be strengthened. Clean and maintain the floor regularly, and deal with the wear and cracking problems that occur in a timely manner. At the same time, for high-traffic areas or areas susceptible to chemical erosion, enhanced measures can be taken to improve the wear resistance and stability of the floor. In short, repairing the cracking problem of the diamond floor caused by long-term wear is a complex and meticulous task. Only by starting from multiple aspects such as problem analysis, pre-repair preparation, repair plan, curing and strengthening treatment, subsequent care and maintenance, and preventive measures can the quality and effect of the repair work be ensured. At the same time, paying attention to safe construction and environmental protection are also important aspects that cannot be ignored. Through scientific repair methods and effective preventive measures, we can extend the service life of emery floors, improve the use effect, and provide strong protection for the safety and beauty of various places. However, for non-professionals, it may be difficult and risky to repair emery floors. Therefore, in actual operation, it is recommended to seek the help of a professional floor repair service team. They have rich experience and professional skills, can formulate appropriate repair plans according to specific circumstances, and ensure the quality and safety of construction. At the same time, they can also provide follow-up maintenance and maintenance suggestions to help users better manage and maintain the floor. In summary, the repair of emery floors requires comprehensive consideration of multiple aspects, from problem analysis to the implementation of preventive measures. Through scientific methods and professional team support, we can effectively solve the problem of cracking of emery floors and improve the performance and life of the floor. At the same time, strengthening daily maintenance and maintenance work is also the key to ensure the long-term and stable operation of the floor. Through continuous efforts and attention, we can let the emery floor continue to play its important role in various places and provide a safe and comfortable environment for people's life and work. The above is a comprehensive analysis and solution on how to repair the cracking problem of emery floors caused by long-term wear. I hope that these contents can provide you with useful references and inspirations, helping you to better solve the problem of floor cracking and improve the use effect and service life of the floor. At the same time, it is also recommended that you pay attention to safety, environmental protection and efficiency in actual operation to ensure the smooth progress of the repair work and achieve good results.