Recently, at the installation site of the tower crane at the Feili Lanting construction project site in Lanshan District, Linyi City, Shandong Province, a construction worker was operating with a red nut in his hand. I saw him rotate a few times at the end of the nut, and a smart early warning nut was installed. Like conventional nuts, this smart early warning nut comes with wire teeth, and it takes less than 5 seconds to manually install a nut, which is convenient and quick to install.

It is understood that the intelligent early warning nut is a new product developed to eliminate the potential safety hazards caused by the loosening of high-strength nuts. The high-strength nut is an important part of the tower crane connecting the standard section of the tower body. Although it is small, the safety problem caused by its loosening cannot be underestimated. In the tower crane operation, the high-strength nuts are inevitably loosened and fallen off due to the irregular shear stress, normal stress and wind load for a long time. If they are not discovered in time, the resulting accidents will be unimaginable.

The emergence of the intelligent early warning nut makes the nut loose, an extremely hidden safety hazard, visualized and removed in time. It is installed behind the high-strength nut. When the high-strength nut is loose, the pressure sensor is triggered, and a flashing warning is issued. Through the early warning function of the smart nut, the location of safety hazards is more accurate, the rectification and implementation are more efficient, and the risk of the tower crane overturning is greatly reduced.

"More than 1,000 smart early-warning nuts of this kind were installed in the important parts of the tower crane and construction elevator in the standard section of the project, and it took only 3 days for all 4 workers to manually install them." According to Wu Chen, the safety manager of the project, the specifications of the smart early-warning nuts The size can be selected according to the corresponding bolt size. It is not afraid of bad weather, waterproof and dustproof, and easy to install.

The intelligent early warning nut has a built-in button battery. When the high-strength nut loosens and retreats, it will continue to flash and emit an early warning, and the continuous warning time exceeds 240 hours. After the inspectors found the pre-warning and tightened the high-strength nut, the pre-warning nut was restored to its original state and could continue to be used. As long as there is electricity, the product is complete and can be recycled after disassembly.

Holding the smart early warning nut, Wu Chen said: "In the past, the smart early warning nut was not used. It required construction personnel to climb up and down on the tower crane for maintenance, which was time-consuming and labor-intensive, and was not very safe. Now that this equipment is used, construction personnel can save It saves time and labor. Now no matter which screw or nut is loose, it can quickly find the loose position and reinforce it in time, which ensures safe production, improves work efficiency, and greatly reduces the time and frequency of equipment inspection and maintenance personnel working at high altitudes. the safety of the workers.”

Wu Chen said that the intelligent early warning nut has technical advantages, but the price is slightly higher, and it is difficult to quickly popularize it at present. Three types of early-warning nuts are commonly used in his project, and the price of each is nearly 20 yuan. If the construction site is widely used, the construction unit will be under great operating pressure.

In this project, in addition to the use of intelligent early warning nuts, there is also a traditional nut maintenance method. Wu Chen said: "The construction workers use a brush to paint red paint on the reinforcement nut. If the nut is loose and the red line is out of position, the inspection personnel will be reminded to reinforce it in time to avoid production accidents caused by the nut falling off. This traditional nut maintenance method, The cost is low and the operation is easy, and it is still widely used at present." This traditional nut maintenance method accounts for 70% of the application in the construction site.

According to the investigation, there are 182 projects under construction in Lanshan District, and 35% of the projects have installed intelligent early warning nuts. The overall feedback of the nuts is good and can play a good early warning effect. In the next step, the district will encourage construction units to expand the scope of application, widely used in hanging baskets, attached lifting scaffolds, unloading platforms and other hidden nut loosening facilities, so as to further ensure the construction safety of projects under construction.

According to Guan Guixu, director of the Housing and Urban-Rural Development Bureau of Lanshan District, the application advantage of the intelligent early warning nut is that it can be disassembled and reused, and the early warning can be seen day and night; the maintenance method of hand-painted line nut saves production costs and has a certain early warning effect. , many construction projects are still in use. In order to strengthen safety production management, construction units are encouraged to apply new equipment, new processes, and new methods, and through intelligent management and control methods, improve the effect of equipment safety management and control, help improve the level of intelligent management of projects, and escort the safety of construction and production. At the same time, the main responsibility for safety of production enterprises should be further consolidated, and the safety awareness of construction, construction, supervision and other units should be comprehensively improved, so as to effectively avoid production accidents and ensure the safety of people's lives and property.