Some standard content:
GB16909—1997
This standard adopts the Japanese JISA8952—1989 "Fiber Sheet (Cloth or Dense Net) for Construction Engineering" in a non-equivalent manner. Since the product is basically the same as similar Japanese products in structure, process and usage, the formulation of this standard not only meets the needs of the country, but also maintains the basic consistency with the relevant parts of this standard. When compiling this standard, due to the conversion of some contents of the Japanese standard into this national standard, a chapter of referenced standards was added, and its Chapter 3 Quality was changed to Chapter 5 Requirements, and its construction content was incorporated into it, and Chapter 5 Shape and Size was changed to Chapter 4 Specifications. Appropriate modifications were made according to my country's situation, and the original Chapter 6 Test was changed to Chapter 6 Test Method. At the same time, the relevant contents of relevant national standards were referred to, and the main performance test methods were consistent with the requirements of relevant national standards. Some contents that have been proven to be suitable for my country's situation in practice were also added. Appendix A of this standard is the appendix of the standard.
This standard was proposed by the Ministry of Labor of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Labor Protection Products of the People's Republic of China. The drafting units of this standard are: National Labor Protection Products Quality Supervision and Inspection Center, Construction Supervision Department of the Construction Industry Department of the Ministry of Construction, Taimeihua Fiber Industry Co., Ltd., Yantai Huaqing Plastic Products Co., Ltd., and Beijing Zhenxing Labor Protection Products Factory. The main drafters of this standard are: Yan Yubo, Qu Suiyin, Yang Wenfen, He Jianan, Shi Shenqian, Yang Xiangsheng, Zhao Liugen, Gao Zhezi, Xu Fangshan, and Sun Deshui.
1 Scope
National Standard of the People's Republic of China
Fine mesh safety vertical net
Fine mesh safety vertical netGB16909—1997
This standard specifies the specifications, requirements, test methods, inspection rules, marking, transportation, storage and use rules of fine mesh safety vertical net (hereinafter referred to as fine mesh net).
This standard applies to fine mesh nets made of chemical fiber as the main raw material, which are used to prevent people from falling and falling objects from injuring in construction. 2 Referenced standards
The texts contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB2828-87 Sampling procedures and sampling tables for batch inspection (applicable to the inspection of continuous batches) GB2829-87 Sampling procedures and sampling tables for periodic inspection (applicable to the inspection of production process stability) GR5455-85 Determination of flame retardant properties of textile fabrics by vertical method GB6529-86 Standard atmosphere for drying and testing of textiles GB8834-88 Determination of physical and mechanical properties of ropes 3 Definitions
This standard adopts the following definitions.
3.1 Mesh density
The number of meshes per 100 square centimeters. 3.2 Fine mesh safety vertical net The mesh density is not less than 800 days/100 cm*, and it is installed vertically to the horizontal plane to prevent people from falling and falling objects from injuring them. It is generally composed of a net body, a round button with a hole, a side rope and an additional tie rope. 3.3 Round button with hole Made of gold material, a round button with a hole in the middle. The distance between two round buttons is called the round button spacing. 3.4 Net body
A mesh body woven with fibers.
3.5 Siderope
A rope set on the edge of the fine mesh net to strengthen the edge strength of the fine mesh net. 3.6 Tied rope
A rope that fixes the fine mesh net to the scaffolding through the round button with a hole. 3.7 Specification
It is expressed by the width and length of the fine mesh net, in meters. 3.8 Pre-tension pre-tension
State Administration of Technical Supervision approved 199B-01-01 implementation on July 7, 1997
GB16909-1997
Before the tensile test, the load of the sample in the unnatural wrinkled state is eliminated (i.e. 10 times the mass of the sample). 3.9 Breaking stress breaking stress
The maximum tensile force measured when the sample is stretched to break, expressed in Newton or dry Newton. 3.10 Elongation at break extension at break the elongation of the sample when it reaches the breaking strength, expressed in millimeters. 3.11 Streching resistance at unwelded joint Streching resistance at unwelded joint Under the specified test conditions, a longitudinal tensile force perpendicular to the joint is applied to the sample until the yarn or joint in the fabric breaks, or the yarn in the fabric slips and the joint splits, the maximum force measured, expressed in Newton or kilonewton. 3.12 Trapezoidal method tearing strength When a trapezoidal test specimen is stretched, the maximum tensile force measured when the right-angle cut expands, expressed in Newton or kilonewton. 4 Specifications
4.1 The specifications of the close-mesh net shall comply with the provisions of Table 1. Table 1
Width×Length
1. 8× 3-6
1. 8× 5. 4
1.B×6. 0
3. 0× 6. 0
3. 6×5. 4
3. 6×6.0
1 Whether there is a side rope is determined according to the strength of the net structure. Specifications of close-mesh net Size and ring spacing
Allowed tolerance
2 Users are allowed to prepare their own tethers, but tethers must be present during inspection. 4.2 Other specifications can be determined by agreement between the contracting parties. 4.3 The minimum width of the dense mesh shall not be less than 1.2m. 4.4 The marking consists of the product code (ML) and the specification. Marking example:
Dense mesh with a width of 1.8m and a length of 6mbZxz.net
ML-1.8X6.0 GB 16909
5 Requirements
5.1 Appearance
5.1.1 There shall be no skipped stitches or missed seams in the sewing thread, and the seam edges shall be evenly hooked. 5.1.2 Each dense mesh is allowed to have one seam, and the seam joints shall be straight and firm. 5.1.3 There shall be no broken yarn, holes, deformation or weaving defects that hinder use. 5.2 Structure
5.2.1 The mesh density shall not be less than 800 mesh/100cm. 5.2.2 The eyelets at the edges of the dense mesh must be firm and reliable. 5.2.3 The hole diameter of the buckle shall not be less than 8mm.
5.3 Performance
The performance of the dense mesh must comply with the requirements of Table 2, Buckle spacing
Breaking strength·Breaking length, kN·mm
Tensile strength at joint, kN
Trapezoidal tear strength, N
Strength of buckle, N
Penetration resistance
Strike resistance
Breaking strength of tether, N
Retention rate of breaking strength after aging
Flame retardant properties, 9
Breakage spacing, mml
GB 16909-1997
Performance of dense mesh
≥49, one piece of sample below 49 is allowed, the minimum value is ≥44 Same breaking strength
2 5% of the breaking strength in the corresponding direction, the minimum value includes 4922.45Lu
No negative penetration or obvious damage to the mesh
The edge of the mesh (side rope) is not allowed to break, the straight line length of the two bodies is 200mm, the length of the curved (folded) line is ≤150mm
≥1960
Continued burning person 4, obvious damage《4
2) Obvious damage: the curved (folded) line length of the mesh after the test is greater than 60mm, and the straight line length is greater than 100mm. 6 Inspection method
6.1 Breaking strength-breaking elongation
6-1.1 Sampling
Randomly cut 3 longitudinal and transverse specimens with a width of 50mm and a length of 300mm from the mesh. Pay attention to avoid damage that may affect the test results at the cutting point.
6. 1.2 Test conditions
Pre-humidification of the specimens shall be carried out in accordance with Chapter 3 of GB6529-86. Humidification of the specimens shall be carried out in accordance with Chapter 4 of GB6529-86 or balanced in the standard atmosphere for the test for more than 24 hours. The test shall be carried out at a temperature of 20°C ± 2°C and a relative humidity of 65% ± 3%. When the test room cannot guarantee the standard atmosphere, it shall be kept as close to the standard atmosphere as possible. The temperature and humidity of the test shall be recorded in the test results. 6.1.3 Test
Use a tensile testing machine with an accuracy of ±1% and a clamp width of 30 mm. Clamp the sample under pre-tension (as shown in Figure 1). The jaws of the clamp should be at right angles to the tension line. The nominal clamping length of the sample is 200 mm. The tensile speed is 200 mm/min ± 10 mm/min. Measure the strength and elongation at break.
6.1.4 Calculation and expression of results
6.1.4.1 Calculation of results
Where: AL—
GB 169091997
Unit: mm
Figure 1 Breaking strength·elongation at break test
AL = G - G.
Elongation at break of test piece, mm;
Original gauge length of test piece, mm;
Gage length at break of test piece, mml
Average value of breaking strength·elongation at break, kN·mm; Breaking strength of each test piece, mm
-Elongation at break of each test piece, mm:
-Number of test samples.
6.1.4.2 Result expression
+-....(2 )
Represent the arithmetic mean and minimum value of longitudinal and transverse breaking strength and breaking elongation respectively. Retain the significant figures to the integer place. 6.2 Trapezoidal tearing strength
6.2.1 Sampling
Cut 3 longitudinal and transverse test pieces with a width of 75mm and a length of 150mm from the mesh, draw an isosceles trapezoid as shown in Figure 2, and cut a 10mm right-angled cut in the center of the short side (measure 10mm from the end of the wire, if there is a wire strip, the wire strip should be cut off). 6.2.2 Test conditions
Same as 6.1.2.
Incision length
6. 2. 3 Test
Incision mark diagram
GB16909—1997
5 Incision length
Figure 2 Trapezoidal tear strength test
Unit: mm
Use a tensile testing machine with an accuracy of ±1% and a clamp width of more than 75mm, so that the clamping line of the clamp clamps along the two waists of the isosceles trapezoid to clamp the sample, and pay attention to the symmetrical position of the sample between the upper and lower clamps. The tensile speed is 150-200mm/min, and the maximum tear strength value is recorded when the incision expands.
6.2.4 Result expression
Calculate the arithmetic mean of the longitudinal and transverse tear strengths respectively, and retain the significant figures to the integer place. 6.3 Tensile strength of joints
6.3.1 Sampling
Take three specimens from the joints of the mesh as specified in Figures 3 and 4. 6.3.1.1 Fusion joint specimen: as shown in Figure 3. Unit.tmm
Fusion joint
Figure 3 Tensile strength test of fusion joint
2 Seam joint specimen: as shown in Figure 4. 6.3.1.2
GB16909—1997
Unit: nm
Joining joint
Figure 4 Tensile strength test of link joint
6.3.2 Test conditions
Same as 6.1.2.
6.3.3 Test
Same as the method in 6.1.3, stretch until the fabric breaks or the seam is disconnected or the key cracks, and terminate the test. Record the maximum seam strength value and the reason for the final rupture of the sample (fracture of fabric thread, breakage of seam, slippage of fabric yarn, seam crack or other reasons). 6.3.4 Expression of results
Take the arithmetic mean of the tensile strength of the three seam parts, and retain the significant figures to the integer place. 6.4 Strength of open eye buckle
6.4.1 Sampling
Take 3 samples of longitudinal and transverse open eye buckle from the dense mesh as shown in Figure 5. If the dense mesh has no edge rope, the sample can be cut along the folded edge, and be careful not to damage the edge of the dense mesh. 6.4.2 Test conditions
Edge rope fixed on the frame
GB 169091997
Tensile gauge
Edge rope fixed on the frame
+Tensile god
Figure 5 Ring buckle tensile test
The test is carried out at room temperature and under humid conditions. In case of dispute, it is carried out according to 6.1.2. 6.4.3 Test
Use a tensile testing machine or tensile gauge with an accuracy of ±1%, hang the center of the ring buckle on the clamping rod of the tensile machine or tensile gauge, and fix the rope or the cut edge of the net on the bracket. Fix and clamp it with a 450mm wide metal clamp at a distance of 300mm from the edge of the net, and the tensile speed is 200mm/min±10mm/min, and measure the tensile strength in the longitudinal and transverse directions. 6.4.4 Expression of results
Calculate the arithmetic mean of longitudinal and transverse tensile strength respectively, and retain the valid figures to the integer place. 6.5 Penetration resistance
6.5.1 Test equipment
6.5.1.1 Penetration test frame: a rigid frame with an inclination of 30° to the horizontal plane, as shown in Figure 6 (the test frame material is carbon steel pipe). The opening size of the test frame is consistent with the specification of the test net, as shown in Figure 7. Automatic release of the accumulator
Test grip
Test frame pillar
Figure 6 Penetration test
GB16909-1997
Unit: rm
Consistent with the length of the test net
Figure 7 Test frame
6.5.1.2 Lifting and releasing device: can lift and release the penetrating falling body. 6.5.1.3 The mass of the penetrating falling body is 5000g ± 208, and the dimensions are shown in Figure 8. Unit: mm
Cylinder
End part
440 + 0.2
The end part and the net cylinder are made of solid magnetic steel. Figure 8 Falling body
6.5.2 Test
6.5.2.1 Hang the penetrating falling body on the releaser of the lifting device and lift it to the specified height, see Figure 6.6.5.2.2 Tie the test net tightly to the test frame, and the four sides should be close to the frame to make it tight (as shown in Figure 9). 6.5.2.3 Adjust the distance of the penetrating falling body so that the bottom of the falling body is 3m away from the impact point of the test net. 6.5.2.4 Release the penetrating falling body and check the penetration situation. 6.5.2.5 Representation of results
According to the penetration situation of the dense mesh, record the damage situation and damage length. 6.6 Impact resistance
6.6.1 Test equipment
CB 16909--1997
Impact position
Figure 9 Impact test
Test frame
6.6.1.1 Simulated humanoid sandbag: 100 cm long, 2800 cm2 bottom area, 100 kg ± 2 kg mass. 6.6.1.2 Impact test frame: The opening size of the test frame is consistent with the test net specification, with a height of more than 1.5 m, and should be able to raise, lower and release the simulated humanoid sandbag. The frame material is made of carbon fiber tool tube, which should have sufficient rigidity. Its structural type refers to Figure 6, but the plane where the test frame is located is parallel to the horizontal plane.
6.6.2 Test
Hang the human-shaped sandbag so that the center of the sandbag is located at the center of the frame and the length is parallel to the long side of the dense mesh. Lift it above the frame. Then tie the test net firmly to the test frame. Lift the sandbag so that its bottom is 1.5m away from the net surface and then release the sandbag, as shown in Figure 9. 6.6.3 Representation of results
According to the situation of the dense mesh after being impacted, the breaking situation is represented by the net body not breaking or being punched through, the breaking length of the net body, and the edge and tie rope not breaking.
6.7 The breaking strength of the tie rope shall be measured in accordance with the provisions of GB8834. 6.8 Retention rate of breaking strength after aging
6.8.1 Sampling
Perform in accordance with 6.1.1.
6.8.2 Sample aging treatment
First place the sample in a high temperature aging box at 60℃±2℃ for 48h, then immediately transfer it to a low temperature box at -20℃±2℃ for 48h, then transfer it to a high temperature box, repeat this process for a total of 480h. 6.B.3 Test conditions
Same as 6.1.2.
6.8.4 Test
Perform according to 6.1.3.
6.B.5 Result expression
Calculate the arithmetic mean of longitudinal and transverse breaking strength respectively. Then calculate the breaking strength retention rate, a
Where: -- breaking strength retention rate after aging, %; F. -- average breaking strength after aging, F. -- average breaking strength before aging.
6.9 Flame retardant properties
Perform according to GB5455.
6.10 Specifications, ring buckle distance, appearance and structure F
+×100
GB 16909—1997
Measure with a steel tape measure, and visual inspection for appearance. Visual inspection and caliper with an accuracy of 0.05 or more for structure. 7 Inspection rules
7.1 Inspection categories include factory inspection, type inspection and incoming inspection. 7.2. Inspection
Manufacturers shall conduct batch inspection according to the normal sampling plan specified in GB2828. Products are produced once as a batch, and the maximum batch should be less than 5,000 sheets. The sample size, inspection level, unqualified classification, qualified quality level, and judgment array of each inspection are shown in Table 3. Table 3
Inspection items
Specifications and dimensions
Breaking strength × breaking elongation
Strength of joint
Strength of eyelet buckle
Splitting strength (trapezoidal method)
Breaking strength of tether
Retention rate of breaking strength after aging
Impact resistance
Penetration resistance
Flame retardant properties
7.3 Type inspection
Batch range
51～150
151~500
5D1 ~3 200
3201~5 000
26 ~150
151～1200
1 201~5 000
51~500
501 ~-5 000
7.3.1 Carry out type inspection frequently in the following casesa) New product identification;
b) When the formula or process changes;
c) Apply for production license:
d) When the production is stopped for more than half a year and it is time to resume production,
e) Periodic inspection, times a year:
f) When the national quality supervision agency makes a request. Days small
Unqualified
Qualified quality
Quality level
Judgment array
Qualified judgment number
Unqualified judgment number
7.3.2 Type inspection is carried out by the quality supervision and inspection department designated by the state. See Table 4 for the discrimination level, unqualified quality level and judgment array.
7.3.3 The number of samples for type inspection is n=3. When the number of samples is n≠3, it shall be implemented according to Table 2 of GB2829-87. 7.3.4 The samples shall be randomly selected from the qualified products in batches (except for the identification of new products). 7.3.5 When the number of samples is n3, one sample shall be tested for penetration resistance. One sample shall be tested for impact resistance and one sample shall be tested for other properties. When the number of samples is n≠3, it shall be implemented according to the sampling rules.
Discrimination level
7.4 Incoming inspection
Unqualified category
GB16909-1997
Unqualified quality level
Discrimination array
Qualified judgment number
Unqualified judgment number
7.4.1 The purchasing unit shall conduct random inspection on impact resistance and penetration resistance according to the incoming batch. Other properties shall be determined by the user as needed. Units without inspection capabilities should go to the nationally recognized inspection department for inspection. The sample size shall be implemented according to Table 5. 7.4.2 Samples shall be randomly selected from the incoming batch, and all inspection samples must be qualified. Table 5
Batch size
Sample size
Marking, packaging, transportation, storage
8.1 Marking
>500~2 000
Each dense mesh shall be firmly sewn with a permanent label, including the following: a) Product name
b) Product mark,
c) Trademark
d) Manufacturer name and address;
e) Manufacturing batch number, production date;
f) Industrial product production license number.
8.2 Packaging
>2 000
Each dense mesh should be firmly attached with a safety certificate and inspection certificate. 5 or 10 meshes are bundled into a package with product instructions. The outer packaging can be made of cartons, plastic sheets, plastic nets, plastic films or kraft paper according to transportation conditions. 8.3 Transportation and storage
During storage and transportation, heat insulation must be used, and chemical corrosion and contact with sharp objects must be avoided. Hooks are prohibited during transportation.
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