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As one of the pillar industries of the national economy, the construction industry has made significant contributions to the healthy development of the national economy. However, the construction industry still belongs to the accident-prone industry, especially in the case of one of the four major hazards. Therefore, how to strengthen the safety level of construction sites and minimize the serious harm caused by falling from high places has become an important issue that the construction industry urgently needs to solve. The correct purchase and use of safety nets is to prevent high places from falling. Important measures for the accident. Here is a brief introduction on how to choose a safety net. First, the basic concept
1. Safety net: A net used to prevent people and objects from falling, or to avoid and mitigate falling and physical damage. The safety net is generally composed of a net body, a side rope, a tether and the like.
2. Net body: a net body made of monofilament, thread, rope, etc. or made by other web forming processes, which constitutes the main body of the safety net.
3. Side rope: A rope that is connected to the mesh body along the edge of the mesh body.
4. Tendon: A string that is regularly worn on a mesh body to increase the strength of the safety net.
5. Specifications: The width (height) and length of the safety net, in meters.
6. Installation plane: The plane where the safety net support point is located.
Second, the classification and marking of safety nets
1. According to the function of use, safety nets are divided into three categories.
1 Safety plane: The safety net used to prevent people or objects from falling, which is not perpendicular to the horizontal plane.
2 Grid: Install a flat vertical horizontal plane, a safety net to prevent people or objects from falling.
3 dense mesh safety net: the mesh density is not less than 800 mesh / 100cm2, installed perpendicular to the plane, used to prevent people from falling and falling objects. It is generally composed of a mesh body, an open eye buckle, a side rope and an additional tether.
2. The product mark consists of three parts: name, category and specification. The letters P, L and ML represent the flat net, the stand net and the dense mesh safety net respectively. E.g:
1 width 3m, length 6m cotton flat net: nylon safety net - P-3 × 6 (GB5725)
2 width 1.8m, length 6m dense mesh safety net: ML-1.8×6 (GB16909)
3 width 4m, length 6m flame-retardant weilun stand: Resislent vinylon safety net L-4×6 (GB5725)
Third, the technical requirements of the safety net
1. The safety net can be made of nylon, vinylon, rayon or other materials with weather resistance not lower than the above varieties.
2. The height of the flat net shall not be less than 3m, the width of the vertical net shall not be less than 1.2m, and the width of the dense mesh safety net (height) shall not be less than 1.2m. Product specification deviation: allowed to be less than ±2%. The weight of each safety net should generally not exceed 15kg.
3. A safety net with a diamond or square mesh with a mesh length of no more than 8 cm.
4. The connection between the side rope and the net body must be firm, and the breaking strength of the flat net side rope shall not be less than 7000N; the breaking tension of the side net side rope shall not be less than 3000N.
5. The tether is evenly distributed along the edge of the net, and the spacing between two adjacent tethers is to comply with Table 1. The length is not less than 0.8m. When the tendons are strong and the tethers are used together, the tether portion must be lengthened, and after being fastened to the side length, the tethers are folded back and fastened to form at least two roots. Adjacent two tether spacing table 1
Safety net category | Adjacent two tether spacing m |
Flat net | ≤0.75 |
Internet access | ≤0.75 |
Dense mesh safety net | ≤0.45 |
6. The distribution of the tendons should be reasonable. The distance between two adjacent tendons on the flat net is not less than 30cm, and the breaking strength of the tendons is not more than 3000N.
7. The mesh body is strong and should meet the corresponding product standards.
8. All nodes of the safety net must be fixed.
9. According to the safety net impact test method, the test shall be carried out, and the impact performance shall comply with the requirements of Table 2. Adjacent two tether spacing table 2
Safety net category | Flat net | Net | Dense mesh safety net |
Impact height m | 10 | 2 | 1.5 |
test results | Net rope side rope tether does not break | Net rope side rope tether does not break | Meet the requirements of GB16909 |
10. The barrier net safety net must have flame retardancy, and its continuous burning smoldering time should not exceed 4s.
IV. Safety net inspection The safety net inspection is divided into two types: factory inspection and type inspection. Factory inspection includes: 1 appearance, specification, weight, mesh length; 2 edge rope, rib rope breaking strength; 3 impact resistance; 4 penetration resistance (for dense mesh safety net); 5 flame retardant properties (applicable Flame retardant safety net). Type inspection and construction site use are of little significance (omitted). 5. Marking, packaging, transportation and storage 1. The product logo includes the following:
1 product name and classification mark;
2 mesh side length;
3 manufacturer name, site;
4 trademarks;
5 date of manufacture (or number);
6 expiration date;
7 Other contents that must be filled in according to relevant regulations, such as production license number.
2. Each safety net should be packaged in plastic film, paper bag, etc., with product manual, factory inspection certificate and other documents (such as security certificate) that must be provided according to relevant regulations.
3. For those who have a storage period of more than 2 years, they shall be sampled at 0.2%, and when the storage period is less than 1,000, two samples shall be taken for impact test.
6. General principles of use of safety nets
1. Each tether of the safety net should be tied to the frame. The four surrounding ropes (edges) should be tightly attached to the brackets. The tie should conform to the principle of easy knotting, firm connection and easy unraveling, and the force is not dissipated during work. The safety net with ribs should also be attached to the bracket when installing.
2. The flat mesh surface should not be stretched too tightly, and the minimum distance between the flat net and the surface of the lower object should be no less than 3m. The distance between the two layers of flat wind shall not exceed 10m. 3
. The vertical mesh surface shall be perpendicular to the horizontal plane and shall not exceed 10 cm from the maximum edge of the working edge.
4. The safety net after installation should be inspected by a special person before use.
5. For the safety net in use, regular or irregular inspections should be carried out, and the online objects should be cleaned up in time. Replace it when it is subjected to a large impact.
Editor in charge: Liu Jiehui
Shandong Fiberglass Group Corp. is a state owned enterprise with registered capital RMB400million, covering an area of 800,000sqm. It has 3 subsidiaries: Tianju Energy Saving Material Corp, Glasstex Fiberglass Material Corp and Yishui Thermo Electricty Plant. Currently we can provide 7 categories products with 300 more kind products in ECR fiber, Ecering@Tex Modified Fiber,c-glass fiber, Wallcoveing, Insect Screen, PCB Tissue and Mesh.We are certified enterprise group with IS09001, ISO18001, ISO14001, Germannischer Lloyd(GL),UL and CQM certificates. Now we ranked China 4th largest Fiberglass producer. In 2020, we would become world Top 7 largest fiberglass producer with roving annual capacity 450,000tons, and fabrics capacity 230,000,000sqm. And some of our products capacity would become China Top 1, like C-CR Speicial glass fiber, ECR High properties glass fiber, Ecering@-Tex modified glass fiber and wallcovering.
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Shandong Fiberglass Group Corp. , https://www.en-glasstex.com