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Write article | KKC

Revision | A Xian

When we pass by the construction site, we can often see that the unfinished buildings are covered with a layer of green "cloth". Through this layer of "cloth", we can vaguely see the scaffolding on the building.

Buildings that have not yet been completed at the construction site | Wiki actually, if you look closely, you will find that these buildings are not covered with "cloth", but many nets with very small meshes. Its official name is safety net, which is a kind of net to prevent people and objects from falling, or to reduce the damage caused by falls and objects. There is a saying in construction projects that there are "three treasures" in the safety protection of construction workers: safety helmets, seat belts and safety nets. Safety net can be juxtaposed with seat belts and helmets, which shows how important it is for the safety of construction projects.

The building is covered with a green safety net | the SINGTEX safety net is generally installed on the outside of the scaffolding. If the construction workers fall while working, they can grasp the safety net and stop falling. Even if they do not catch it, the safety net can also slow down and reduce the harm to the human body caused by accidental fall. The safety net can also intercept materials or tools that fall from the building to prevent workers or passers-by from being hurt.

Safety net can reduce fall damage | JMD Uniforms has some other functions in addition to reducing fall damage. Construction sites will produce a lot of dust and noise, safety nets can reduce their pollution to the environment to a certain extent. The materials of safety net are generally flame retardant and can prevent fire caused by welding sparks. In addition, when construction workers are working at high altitude, the safety net can also block the horizontal wind, block the workers' downward line of sight, and reduce the fear of height.

The safety net can also reduce dust and noise pollution. The mesh on the Dr.THIEL Gmbh safety net is officially called mesh and is shaped like a diamond or square. The quality of the safety net is closely related to the aperture and density of the mesh. The smaller the aperture and the denser the distribution of the mesh, the better the interception effect of falling objects (for example, it can intercept smaller objects), and the stronger the ability to withstand the impact. The higher the security. According to the safety inspection standard of building construction, the outer side of the outer scaffolding of the project under construction should be closed with a secret safety net, and the aperture of the mesh should not be larger than 12mm.

The mesh of the safety net | Wiki in order to play an effective protective role, the material of the safety net needs to have physical properties such as low specific gravity, fracture resistance, impact resistance, aging resistance and so on. At present, the manufacturing material of safety net on construction site is mainly high density polyethylene (HDPE). The weight of each safety net generally does not exceed 15kg, and the breaking strength of net rope is more than 3000N. Although the mechanical properties of materials such as nylon rope are better than those of high-density polyethylene, the coverage of the safety net on the site is so large that a single high-rise building may need more than 1000 square meters, considering the cost. Safety nets generally do not use expensive materials.

The material of safety net is generally high density polyethylene | SafetyNet365 according to the mode of installation, safety net can be divided into two types, the safety net perpendicular to the horizontal plane is called safety net, and the non-vertical safety net is called safety net. The safety net covers the surface of the building, and the safety flat net is installed at intervals. Although the function is also to reduce the injury of people and objects falling from high altitude, from the point of view of force, the net is buffered and decelerated on the side, while the flat net directly bears the impact of falling objects, so the strength requirement of the flat net is generally higher than that of the net. The specifications and dimensions are also different from those of the net.

Safety net and safety flat net are used together | unlike the aperture and density of the mesh, there is no uniform standard for the color of the safety net, but we can find that the color of the safety net on the site is mostly green, a small part is blue, and almost no other colors can be seen. The safety net is mainly green, although it has a certain reflection of solar heat and aesthetic effect, but it is more of an established industry habit.

The safety net also has a blue SafetyNet365. In fact, in addition to the construction site, we can occasionally see a green net on some bare land or hillsides. This kind of green net on the land is called dustproof net or earth net. Its main function is to prevent wind and dust from being blown away by the wind, and to reduce soil erosion on hillsides.

Dustproof net covered on the soil slope | hfxdt.com corresponds to the mesh density of the safety net. There are also many types of dustproof net, such as 3 stitches, 4 stitches, 6 stitches and so on. The higher the number of needles, the higher the mesh density and the higher the coverage. Each needle number of the dust net has the corresponding application scene, for example, 2 stitches can only cover large objects such as cinder and stones, and 6 stitches are suitable to cover sand, gravel, sand and so on.

Therefore, the next time you encounter a building on a construction site or a piece of green clothes on the land, don't think it is a piece of cloth, it is actually a protective net, which not only protects the safety of workers and pedestrians, but also maintains the cleanliness and cleanliness of the urban environment.

Reference:

[1] GB 5725-2009, safety net [S].

[2] JGJ 59-2011, Safety Inspection Standard for Building Construction [S].

[3] https://en.wikipedia.org/wiki/Safety_net

[4] https://www.chinanetlon.com/product/construction-safety/building-scaffold-safety-net.html

[5] https://mipaindustries.com/shade-net/

This article is from the official Wechat account: bring Science Home (ID:steamforkids), author: everything.

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