Technical & Industry Knowledge Base

Intellectual property assets such as patents are the core of many organizations and transactions related to technology. Patents that contribute to products with a wide market appeal or that represent a considerable improvement to an existing product in an established market may be likely to generate significant economic returns.Thus, the commercial value of a patent may be, in part, a function of the size and nature of the market for the product to which the patent pertains. Vanse passionate about being the premier manufacturer of placing . A patent provides a right to a technology holder to exclude others from exploiting the patented invention.There fore, other than the inventor cannot use, make or sell the patented invention without permission from the inventor. This is often referred to as the exclusive right of the invention. Vanse Concrete Laser leveling technology enables faster and flatter floors going for patented vanse laser leveling technology allows you to increase productivity, efficiency, and quality of each and every job.

A power trowel machine is used to create a level, flat area of concrete, smooth finish on a large, just like a poured patio slab for a deck or an interior floor. A single or multiple blades are used that can rotate in a safety cage. The measurement of this tool is around 24 to 48 inches long and has three types such as finish, floating and combined. In relation and based on the size of work, you can use a riding model or a pushable concrete power trowel. Presented in this article are the steps that you can follow for you to use the tool to the best of its ability. Concrete contractors demand reliable equipment to get the job done right. VANSE concrete power trowel spider assembly uses high-strength wear plates made of trowel steel to prevent wear on key components. Repairing your trowel shouldn’t be costly so we make certain our replacement parts are priced right. Spider trowel arm bushings Replacement of these high tolerance bushings assure like new trowel arm alignment. Here are the steps: 1. Select a pushable power trowel for sale with 24 to 36-inch trowel blades if you are planning to level a small area, like those that measure under 1000 square feet. And to smooth the concrete in one series of passes, you can use both the finish and float trowel blades. But if you are working on larger areas or those higher than 1000 square feet, choosing a riding power trowel can be a big help to quickly finish the job before the concrete sets too firmly. The recommended blades to use are those that measure around 36–48 inches. When working with corners, you can change your blade to a 24-inch one. Opt for a different finish or float blades, or a combination trowel blade. 2. Few hours before you use the power trowel, the concrete must be poured. Ensure that the concrete is firm enough to support the power trowel and you, conduct a footprint test. First is to step onto the slab and then measure the depth of the imprint. If the result is less or 1/8 of an inch deep, you can assume that the concrete is ready for troweling. 3. To level the concrete on your first pass, use the trowel with combined blades or float blades. Floating lessens the fills and bumps in the hollows. The machine should be operated at 3/4 speed while keeping the blades flat for the even distribution of weight and to avoid digging into the concrete. The rotational speed will also prevent splatters of still-damp concrete being thrown forward into the path of the machine. Overlap each pass by 1/2 the trowel blades’ length as you traverse the poured plate. Once you’re done floating the entire slab, turn the power trowel at 90 degrees to your first rows. The technique of crossover floating helps you finish missed spots. 4. Continue with the combined trowel blades or change your tool to finish blades to finish the surface, sealing the porous material. Walk behind power trowel to operate at its top speed, this time with the blades fully pitched downward onto the concrete. Doing so will give the slab that highest pressure. To get that matte, gleaming or light gloss finish, create as many passes at right angles. VANSE's concrete power trowel using high quality meterial and with origional HONDA engine, if you had such needs in this field, welcome for asking~

1.The time interval of each start-up should not be less than 10s. 2. In the process of equipment shutdown and transfer, the pulling ring of hub center plug should be pulled out before the tire can be rotated. 3. In the process of equipment transfer, the arm can be lifted manually to control the height of the leveling head. 4. After completion of construction, please lift the nose manually by using the lifting button, and then withdraw from the construction site. It is forbidden to push the machine in the vibration and leveling parts and the ground contact state, so as to prevent damage to the vibration plate. 5. It is strictly forbidden to insert air plugs in operation, to rotate the fixed part of laser receiver by force, and to rotate the fixed part of metal air plug. 6. It is strictly forbidden for those who are not familiar with the performance of the machine to start the machine. They need to receive training before operation. 7. It is strictly forbidden to aim the eyes at the laser beam for a long time. 8. Machines shall not be used under construction in thunderstorm weather. 9. In the process of stopping leveling or turning, the vibration motor must be shut down first. 10. In the process of turning, the speed knob must be adjusted to the position below 3. 11. Check the fastening bolts of vibration motor every 100 hours. 12. The joint head of the lifting frame is refueled once a day. 13. Calcium-based butter is added to the axle head of the wheel every 50 hours. 14. The scraper coupling shaft is filled with oil once a day. 15. It is strictly forbidden to move the laser transmitter when it is turned on. 16. Do not use high-pressure water gun to clean the control box and operation screen and plug the power line of the control box at will. 17. Laser transmitters should be placed in open, non-interference and vibration places, and avoid electromagnetic interference places as far as possible, such as distribution boxes. 18.Handheld receivers snap must be perpendicular scrapers and laser receivers must be in a vertical state. Welcome for asking if you had any needs on concrete laser leveling equipment, choose Vanse, choose quality.

Laser leveling machine is developed according to the increasing demand of modern industrial plant, large shopping mall, warehouse and other large area cement concrete ground for ground quality, such as strength, flatness, levelness, etc. It has the characteristics of good performance and high efficiency. Preparations: (1) After the basic treatment, the laser paver is debugged and fixed reference level is drawn according to the original level; non-woven fabrics and side dies are laid, laser transmitters are erected, and ground elevation is introduced into laser leveller according to the original level. (2) The concrete is transported by commercial concrete. The commercial concrete is transported to the entrance and exit of the garage by tank truck, and then transported to the construction site by three-wheel dumper truck. (3) The elevation of the ground floor is checked by hand-held laser receiver, and the elevation is introduced into the laser paver to adjust the reference point (±0.00) on the leveller. Concrete Paving: (1) After the formwork is supported, the warehouse should be cleaned one day in advance and soaked with water before pouring concrete. When approaching pouring, drain open water, sweep cement slurry or interface agent. Obvious water accumulation is strictly prohibited at this time. If so, the concrete can be paved only if it is removed resolutely. (2) After the concrete is laid down, it is preliminarily flattened. The flattened height should be 3 cm thicker than the elevation. Then it is leveled with a laser paver. The corners which can not be leveled can be leveled by gasoline leveling ruler or manual method. (3) When the warehouse near the wall is being poured, it must be scraped with a scraper ruler in time after the leveller has passed. (4) For concrete mixer can not drive to the site area, but also use tractors to transport concrete. After the completion of the pouring, the floor lighting construction will begin when the concrete is initially solidified. C. In construction, the laser signal received by the laser paver receiver (10 times per second ) automatically adjusts the elevation in real time to ensure that the construction elevation is always in the set standard. Because the laser transmitter is fixed after being set up, it can ensure that the construction of large area of the ground does not produce cumulative errors. D. During the construction, the operator uses a hand-held laser receiver to inspect the ground after the construction of the machine to ensure that the smoothness error is within the controllable range again. 1. It's necessary to ensure that all parts of the laser leveling machine are connected perfectly, without any loosing, so as to prevent problems in the operation process 2. It is necessary to ensure that all parts of the laser leveling machine are connected perfectly, without any loosening, so as to prevent problems in the operation process. Add enough lubricating oil to laser leveling machine in advance to improve the flexibility of controller, so as to improve work efficiency. 3. The surface insulation of cable must be complete, and the slightly damaged parts should be treated with caution until they are all in good condition. This can not only ensure the safety of construction personnel, but also the safety of passers-by. 4. After turning on the power supply, it is necessary to check the direction of the motor rotation. If there is a mistake, it is necessary to change the line immediately in order to avoid greater problems in working hours. 5. Laser leveling machine operators should undergo professional training, such as in the operation process, they can not tilt, can not grasp too tight and other elements should be mastered well, in order to avoid accidents accidentally. 6. Laser leveling machine in the construction process, needs density of soil, can repeat consolidation, do not move back and forth, so even if the result is the same, it will spend more energy on moving, not economical.

Vanse concrete laser leveling for sale is developed for concrete floor of industrial factory building, large supermarket, freight house and other large area projects, and designed for higher requirements for strength, flatness and levelness of concrete floor. We have a series of laser leveling machine for sale: our equipment adopt advanced laser technology to execute leveling to concrete floor, it is a high-accurate and small error leveling machine. Vibrating frequency is 4000 times per minute, which ensures compactness and one-step molding. Operation is simple and flexible, high degree of automation, construction efficiency is greatly increased, it especially applied to large area floor construction, an area of 3000 sq work can be accomplished only by 8 workers per day, 300 sq area can be accomplished per hour, labor cost and intensity are greatly decreased. laser leveling Which factors should be considered when choosing concrete laser leveling machine? Purchase factors of laser leveling: brand, quality, construction effects and after-sales service. * Brand: prudently to choose green-hand brand, for laser leveling machine a high technology product, quality influence factor is not only manifested by technology innovation but also experience. How to define different size and specification? How to treat floor flatness? How to locate laser leveling? All those questions requires years to master. If customers curtly purchase laser leveling machine from green-hand brand, they might become mouse for experiments,troubles will come to them. Therefore, it's important to chose an experienced brand. * Quality: for users, quality shall be valued when choosing laser leveling machine, if the machine is in bad quality, floor process will occur troubles, the whole construction period will be delayed, the enterprise will face to big lose, so low price shouldn’t be the only reason to buy laser leveling, quality is the most important, low price generally makes a mess in market compete, no profit no quality. * After-sales service：another factor customers specially concerns is after-sales service, regular and professional factory should be chosen, only regular factory will provide reliable service, a concrete laser leveling machine is usually used for many years, a long-brand factory will provide persistent after-sales service. After purchase of a satisfying laser leveling check should be executed to laser leveling before paving and leveling, now let Hiking tell you how to do it.Check equipment before installation is to check if the engine oil and gasoline of the equipment are enough.Check if power supply of laser receiver and emitter are enough. Check if accessories(tripod, tool cabinet, rod piece, bolt) of laser leveling machine are taken with integrity. Welcome for asking if you had any needs in the machine.

​Laser leveling machine is developed according to the increasing demand of modern industrial plant, large shopping mall, warehouse and other large area cement concrete ground for ground quality, such as strength, flatness, levelness, etc. It has the characteristics of good performance and high efficiency. A. Preparations: (1) After the basic treatment, the laser paver is debugged and fixed reference level is drawn according to the original level; non-woven fabrics and side dies are laid, laser transmitters are erected, and ground elevation is introduced into laser leveller according to the original level. (2) The concrete is transported by commercial concrete. The commercial concrete is transported to the entrance and exit of the garage by tank truck, and then transported to the construction site by three-wheel dumper truck. (3) The elevation of the ground floor is checked by hand-held laser receiver, and the elevation is introduced into the laser paver to adjust the reference point (±0.00) on the leveller. B. Concrete Paving: (1) After the formwork is supported, the warehouse should be cleaned one day in advance and soaked with water before pouring concrete. When approaching pouring, drain open water, sweep cement slurry or interface agent. Obvious water accumulation is strictly prohibited at this time. If so, the concrete can be paved only if it is removed resolutely. (2) After the concrete is laid down, it is preliminarily flattened. The flattened height should be 3cm thicker than the elevation. Then it is leveled with a laser paver. The corners which can not be leveled can be leveled by gasoline leveling ruler or manual method. (3) For concrete mixer can not drive to the site area, but also use tractors to transport concrete. After the completion of the pouring, the floor lighting construction will begin when the concrete is initially solidified. (4) In construction, the laser signal received by the laser paver receiver (10 times per second ) automatically adjusts the elevation in real time to ensure that the construction elevation is always in the set standard. Because the laser transmitter is fixed after being set up, it can ensure that the construction of large area of the ground does not produce cumulative errors. (5) During the construction, the operator uses a hand-held laser receiver to inspect the ground after the construction of the machine to ensure that the smoothness error is within the controllable range again. *Notice: It is necessary to ensure that all parts of the laser leveling machine are connected perfectly, without any loosening, so as to prevent problems in the operation process. Add enough lubricating oil to laser leveling machine in advance to improve the flexibility of controller, so as to improve work efficiency. The surface insulation of cable must be complete, and the slightly damaged parts should be treated with caution until they are all in good condition. This can not only ensure the safety of construction personnel, but also the safety of passers-by. After turning on the power supply, it is necessary to check the direction of the motor rotation. If there is a mistake, it is necessary to change the line immediately in order to avoid greater problems in working hours. Laser leveling machine operators should undergo professional training, such as in the operation process, they can not tilt, can not grasp too tight and other elements should be mastered well, in order to avoid accidents accidentally. Laser leveling machine in the construction process, needs density of soil, can repeat consolidation, don't move back and forth, so even if the result is the same, it will spend more energy on moving, not economical. Welcome for asking if you had any needs in the concrete paving machine needs!!

There are two ways to control ground-based ground cracking: Control the location of the crack by installing a shrink seam (the crack width cannot be controlled) Control the crack width by installing a reinforcement device (the crack position cannot be controlled) (Vanse YZ30-4E Laser leveling On Working Site) Control the location of the crack by installing a shrink seam: Control the cracking position of the concrete slab; the width of the shrink joint or the crack in the joint is largely controlled by the joint spacing and concrete shrinkage. As the seam spacing and concrete shrinkage increase, the seam width also increases. Similar to the crack, if the seam width is close to about 0.9 mm, the efficiency of locking and transferring the aggregate between the aggregates and avoiding vertical displacement between the seams is greatly reduced. In view of this, many designers use load-conducting designs such as force-transmitting rods, force-transmitting sheets, or continuity-enhancing devices at the shrink seam position to ensure good load transfer and limit vertical displacement between seams. Care must be taken when using the above-mentioned one crack control method on the same floor. If a large number of reinforcing devices pass through the expansion joint, the seam will become too hard to crack and open as designed. When the shrink seam is unable to be activated (ie, cracked and opened) due to the action of the reinforcing device, cracking at a non-seamed portion or a random position is generally generated.

​ For the concrete laser leveling, the tire is the necessary factor to walk, is an important accessory of the equipment. Once there is a problem with the tire of the laser leveling machine, it will directly cause the equipment to fail to function properly. The Method Of Quick Tire Replacement 1.Starting the machine, look for a relatively flat open field, press down the boom lift rod, use the boom support to remove the front wheel off the ground, and then support the flash bridge close to the flat tire side, and wedge the rear wheel (must work closely with the driver to avoid personal injury). 2, the use of crowbar and other tools, remove the bezel and lock ring and then check whether the tire liner and the outer surface of the rim is adhesion (the tire use time is longer, the liner and the outer surface of the rim can be adhesion). If the support can be removed, so that the machine in a short distance slow back and forth until the liner is separated from the outer surface of the rim; Then, the front wheels are back up. 3, the internal and outer tire of the relative position of the mark, in order to find, remove foreign objects and repair tires. 4, using the crowbar and other tools, the tire from the rim to remove. Note that the action should be gentle with the tacit understanding, to avoid being hit by tires, and to protect the valve nozzle. 5.After the outer tire is injured by nails and other slender foreign bodies, if the surface does not have a significant opening or the wound is small, then the tire can continue to be used, if the opening is large, must be repaired (because the machine is operated, the tire is crushed and frictiond, a long time will damage the inner tube, even the opening is larger and larger, the inner tube protrudes, resulting in tire scrapping). 6. If the new inner tube, the bolts at the bottom of the valve nozzle must be tightened to prevent leakage, and then remove the foreign body from the inner cavity of the outer tube and sprinkle it with appropriate talcum powder, applied evenly. In order to make the liner and the inner and outer tire tight, after loading the inner tube should be properly inflated for the inner tube, and then stuffed into the pad. 7, the tire mounted on the rim, installed lock ring, bezel; 8, with the car air compressor to the tire inflatable. 9, press down the boom lift rod, take out the laser leveling machine bracket; Shandong Vanse Machinery has large, medium, small, various models of laser concrete flatflating machine, suitable for large-scale workshop plant. When you choose Vanse equipment, you also choose to have peace of mind after-sales protection. We provide quality after-sales service for all customers 365 days a day. If you have any problems with your equipment, please feel free to contact us at any time. Remote telephone after-sales guidance is an efficient after-sales support method. Our after-sales service engineers will get in touch with you as soon as possible and help you to restore the normal operation of the equipment as soon as possible. Vanse Service, anywhere and anytime!!!

Most of the soil floor is not reinforced, or only nominal reinforcement measures are taken to control the crack width. Reinforcing steel bars placed at the top or top of the floor slab can limit the random crack width due to concrete shrinkage, temperature stress, foundation settlement, external loads, and other problems. This type of reinforcement is commonly referred to as shrinkage and temperature enhancement devices. Shrinkage and temperature enhancement are different from structural reinforcement. Structural reinforcement is usually placed at the bottom of the concrete slab to enhance the load bearing capacity of the floor slab. Most of the soil-bearing structural floors are provided with upper and lower reinforcements at the same time, while controlling the crack width and enhancing the bearing capacity. Due to the construction feasibility and cost of the double-layer reinforcement method, the soil-bearing structure floor is not as common as the non-structure floor. Basic principle If the concrete slab is laid on a high quality base and ensures good support, while using low shrinkage concrete material, the joint spacing is set at 4.5 m or less and installed correctly, there is generally no need for reinforcement. In general, there is almost no cracking at random or non-seam areas. If random cracks do occur, the crack width should also be kept small due to the small joint spacing and the low shrinkage of the concrete material, thus avoiding the problem of subsequent repair or maintenance. When concrete slabs are laid on low-quality bases with more problems, there is a risk of uneven support. When ordinary or high-shrinkage concrete materials or joint spacing exceeds 4.5 m, it is necessary to take reinforcement measures to limit the occurrence of Crack width. When the crack width develops and increases to about 0.9 mm, the load transfer effect of the aggregate locking disappears, causing vertical displacement cracking or "destruction" of the concrete slab. Once this happens, the edges of the crack are exposed, and blasting is likely to occur; and the concrete slab is subject to wheel compaction, especially when high-level forklifts with hard wheels are crushed. Once the blasting phenomenon begins, the crack width of the surface will increase, and the damage of the concrete slab along the crack will deteriorate rapidly. Shrinkage and temperature enhancement methods are required where shrinkage joints are not allowed on site and are not installed. Sometimes, this method is also known as continuous enhancement or seamless flooring, and a large number of closely spaced (90-180 cm) small cracks are allowed on the floor panel. Crack control method Generally, there are two methods for controlling the crack in the soil floor: (1) controlling the location of the crack by installing a shrinkage joint (the crack width cannot be controlled), (2) controlling the crack width by installing a reinforcement device (the crack position cannot be controlled). Using Method 1, we can control the cracking position of the concrete slab; the width of the shrink joint or the crack in the joint is largely controlled by the joint spacing and concrete shrinkage. As the seam spacing and concrete shrinkage increase, the seam width also increases. Similar to the crack, if the seam width is close to about 0.9 mm, the efficiency of locking and transferring the aggregate between the aggregates and avoiding vertical displacement between the seams is greatly reduced. In view of this, many designers use load-conducting designs such as force-transmitting rods, force-transmitting sheets, or continuity-enhancing devices at the shrink seam position to ensure good load transfer and limit vertical displacement between seams. Using Method 2, we allow random cracking of the concrete slab, but with reinforced steel or welded mesh to control the crack width. In general, this method is not used when setting a shrink seam. Cracking occurs randomly, forming numerous numerous intertwined small cracks. Due to the appearance considerations, this type of crack control method needs to communicate with the owner in advance. If your device has an accident, don't worry! When you choose Vanse equipment, you also choose to have peace of mind after-sales protection. We provide quality after-sales service for all customers 365 days a day. If you have any problems with your equipment, please feel free to contact us at any time. Remote telephone after-sales guidance is an efficient after-sales support method. Our after-sales service engineers will get in touch with you as soon as possible and help you to restore the normal operation of the equipment as soon as possible. Vanse Service, anywhere and anytime!!!

Concrete pressure strength detection method 1. Rebounder or Schmitt Hammer (ASTM C805) Method: The hammer is activated by a spring release mechanism, which presses the plunger and presses it into the concrete surface. The rebound distance from the hammer to the concrete surface is in the range of 10 to 100. The measurement results are then associated with the strength of the concrete. Pros: Relatively easy to use and can be done directly in the field. Cons: To ensure accurate measurementresults, pre-calibrated concrete samples are required. Different states of the surface and the presence of rebar under large aggregates or test sites can affect the test results. 2. Penetration test (ASTM C803) Methods: When carrying out a penetration test, a pin or probe is drilled into the concrete surface with a special device. The strength and depth of drilling required to drill into a concrete surface are related to the strength of the poured concrete. Pros: Relatively easy to use and can be done directly in the field. Cons : The data are greatly influenced by conditions such as surface state, template type, and aggregate used. Accurate strength measurements require multiple sampling of concrete samples for early calibration. 3. Ultrasonic pulsation detection (ASTM C597) Method: This method is used to judge the velocity of the vibration energy pulsation in the ground floor. The ease with which this energy penetrates the floor plate reflects the results of the concrete’s ability to elastic, resist deformation or stress, and density. The data is then associated with the strength of the concrete slab. Pros: This is a non-destructive testing method and can also be used to detect defects such as cracking or honeycomb holes inside concrete. Cons: The method is seriously affected by the enhancement method, the moisture in the aggregate and the concrete material. Multiple samples and calibrations are also required to obtain accurate test results. 4. Pull-up test (ASTM C900) Method: The main principle of this method is to pull the metal rod, which is poured inside or installed afterwards, out of the concrete. The cone after pulling out and the amount of force required to pull out from the concrete are related to the strength of the pressure. Pros: Easy to use, can be done in both old and new building structures. Cons: This detection can cause the concrete to break or damage. To obtain accurate test results, a large number of test samples need to be selected at different locations on the floor plate. 5. Drill core method (ASTM C42) Method: The drill core method is used to extract solidified concrete sample blocks from the floor plate. These samples are then compressed in the machine to monitor the strength of their concrete. Pros: These samples are more accurate than field solidification samples because the concrete of strength is tested by actual heat and solidified on site. Cons: This is a destructive detection method that requires the destruction of the structural integrity of the concrete slab. The position of the core needs to be patched after the fact. The strength data must be obtained by the lab. 6. Poured concrete cylinder detection method (ASTM C873) Method: The cylindrical mold is placed in the position of the pouring area. Fresh concrete is discharged directly into these molds, which are retained in the floor board. After the floor plate solidifies, remove the specimens and pressurize them to detect their strength. Pros: This method is considered to be more accurate than on-site cured specimens because the concrete undergoes the same solidification process and conditions as the site floor plate; Cons: This is a destructive detection method that requires the destruction of the structural integrity of the concrete slab. The hole position left after the specimen is removed needs to be repaired afterwards. The strength data must be obtained by the lab. 7. Wireless Maturity Sensor (ASTM C1074) Methods: The principle of this method is based on the direct relation of concrete strength and its hydration temperature history. Before starting pouring, the wireless sensor is placed in a concrete template and secured on the rebar. The sensor receives temperature data and uploads it to any smart device APP with a wireless connection. According to the maturity calculation formula of the setting number in the APP, the collected information is used to calculate the pressure strength of the concrete element at the current position. Pros: Anti-pressure strength data is fed back in real time and updated every 15 minutes. At the same time, because the sensor is embedded inside the template, the data accuracy and reliability are also ideal, i.e. the curing data collected is consistent with the in situ concrete element. This also means that you don’t have to spend time waiting for a third-party lab to provide the test results. Cons: Each batch of mating concrete needs to create a maturity curve using a test method of a collapse dwelling barrel and complete a one-time calibration.

Reinforced rebar and welding mesh control the crack width on non-structural soil flooring. Most of the earthen floors do not do enhanced treatment, or simply do nominal enhancement measures to control the width of the cracks. When reinforced rebar is placed in the upper or top position of the floor thickness, it can limit the width of random cracks caused by concrete shrinkage, temperature stress, foundation subsidence, external loads, and other problems. This type of enhancement is often referred to as a shrinkage and temperature enhancement device. Most soil layers do not be reinforced, or simply do nominal enhancement measures to control the width of the cracks. When the rebar is placed in the upper or top position of the floor thickness, the width of random cracks caused by concrete shrinkage, temperature stress, foundation subsidence, external loads, and other problems can be limited. This type of enhancement is often referred to as a shrinkage and temperature enhancement device. Basic principle Since there are many optional enhancements to non-structural soil flooring, this article will focus on controlling the crack width through reinforcement and mesh enhancement. Reinforced rebar and welding mesh do not prevent cracking. Before the concrete cracking, the function of the enhancement device is basically dormant. Once cracking occurs, the function is activated and its width is controlled by limiting the development of the crack. If the concrete slab is paved on a high-quality base and ensures good support, while using low-shrink concrete material, seam spacing is set at 4.5 meters or less and installed correctly, there is generally no need to take enhancement measures. In general, there is little random or non-seam cracking. If random cracks do occur, the crack width should also be kept smaller due to the relationship between smaller seam spacing and low shrink ingress to concrete materials, thus avoiding the problem of subsequent repairs or maintenance. Once this happens, the edge of the crack is exposed and the edge is likely to burst, especially when the concrete slab is crushed by wheels, especially high-level forklifts with hard wheels. Once the phenomenon of bursting occurs, the crack width of the surface will increase and the damage of the concrete slab along the crack site will deteriorate rapidly. Shrinking and temperature enhancement methods are required when shrink seams are not allowed in the field and are not installed. Sometimes this method is also known as continuously enhanced or seamless flooring, which allows for a large number of tightly distributed (90 to 180 cm) small cracks. Methods of crack control In general, there are 2 ways to control cracks: (1) to control the position of the crack by installing a shrink seam (no control over the width of the crack), or (2) to control the crack width by installing an enhancement device (uncontrollable of the crack position). Method 1, we can control the cracking position of the concrete slab, the width of the shrink seam or the cracking in the seam is largely controlled by seam spacing and concrete shrinkage. As seam spacing and concrete shrinkage increase, so does the seam width. Similar to cracks, if the seam width is close to about 0.9 mm, the efficiency of locking and conducting loads between the aggregates and avoiding vertical displacement between seams is greatly reduced. With this in mind, many designers use load conduction designs such as force levers, force transfer sheets, or continuity reinforcements in the shrink seam position to ensure good load transfer and limit vertical displacement between seams. Method 2, we allow the concrete slab to crack randomly, but use reinforced steel or welded mesh to control the crack width. In general, this method is not used when setting the shrink seam. Cracking occurs randomly, forming numerous small, interlaced cracks. Due to appearance considerations, this type of crack control method needs to be communicated with the owner in advance.

The laser leveling machine can bring us many advantages when it is used. I believe that all the friends who have used it should have realized it. Although everyone is very comfortable when operating the leveling machine, it is necessary to talk about the laser leveling machine. The components, then many friends are not clear, it seems that everyone is not careful enough about the leveling machine, the following article will lead everyone to learn more about the components of the laser leveling machine. Vanse boomed laser leveling machine Components of the laser leveler: 1. Steering system: It consists of steering wheel, steering gear, steering knuckle, steering knuckle arm, tie rod and straight rod. The function is steering. Battery: The function of the battery is to supply power to the starter, and to supply power to the engine ignition system and other consumers during engine start or low speed operation. When the engine is running at high speed, the generator generates enough power and the battery can store excess power. Hydraulic brake structure: The hydraulic brake device consists of a brake pedal, a master cylinder, a sub-pump, a drum (wheel) brake and a fuel pipe. 2. Motor: The motor is the power unit of the laser leveling machine. Its main function is to generate drive torque as a power source for electrical appliances or various machines. Its main function is to use mechanical energy to convert into electric energy. At present, it is more common to use heat energy, water energy, etc. to drive the generator rotor to generate electricity. 3. Transmission: It is composed of transmission case, transmission cover, first shaft, second shaft, intermediate shaft, reverse shaft, gear, bearing, operating mechanism, etc. It is used for variable speed and variable output torque of laser leveling machine. 4, leaf springs and shock absorbers: the role of leaf springs is to maintain a flexible connection between the frame and the body and the wheel or axle. The function of the shock absorber is to moderate the vibration when the laser leveler is subjected to shock. 5. Transmission system: It is mainly composed of transmission, universal joint, transmission shaft and drive axle. 6, driving system: consists of the frame, axle, suspension and wheels. Its basic function is to support the quality of the whole car and to ensure the driving of the laser leveler. 7. Starter: Its function is to convert electrical energy into mechanical energy, drive the crankshaft to rotate, and start the engine. If the continuous starting time is too long, it will cause a large discharge of the battery and the starter coil will overheat and smoke, which will easily damage the laser leveling machine.