1 range
This standard specifies the classification, technical requirements, test methods, inspection rules, marks, packaging, transportation and storage of plastic corrugated pipe products for prestressed concrete bridges.
This standard is applicable to plastic corrugated pipe for prestressed concrete bridges, which is made of high-density polyethylene resin (HDPE) or polypropylene (PP) as the main raw materials through hot melt extrusion.
2 normative reference documents
The clauses in the following documents become the clauses of this standard by reference. All subsequent modifications (excluding errata) or revisions of dated reference documents are not applicable to this standard. However, parties who have reached an agreement according to this standard are encouraged to study whether to use the latest versions of these documents. For undated reference documents, the latest edition is applicable to this standard.
GB/T29 18 Standard Environment for Condition Adjustment and Testing of Plastic Samples (idt ISO 29 1)
GB/T8806 Measurement method of plastic pipe size (eqv ISO 3 126)
Thermoplastic pipe rings-Determination of stiffness
Gb/t111/6 HDPE resin.
GB/T 14 152 test method for external impact resistance of thermoplastic pipes (eqv ISO 3 127).
GB/T 18742. 1 polypropylene piping system for hot and cold water Part 1 General (NEQ ISO/DIS 15874)
3 product classification, structure and model
3. 1 classification
Plastic corrugated pipe can be divided into two categories according to the cross-sectional shape: round and flat.
3.2 structure
See figure 1 and figure 2 for the structure of plastic corrugated pipe. The peak value is 4 mm ~ 5 mm and the wave distance is 30 mm ~ 60 mm
Figure 1 Circular plastic corrugated pipe Figure 2 Flat plastic corrugated pipe
3.3 model
Model representation:
Pipeline type code: the circular pipe code is y; The flat pipe code is B.
Inner diameter of pipeline: the circular pipe is represented by D; The flat tube is represented by the long axis U 1.
Example 1: circular plastic corrugated pipe with an inner diameter of 50mm model: SBG-50Y.
Example 2: a flat plastic corrugated pipe with an inner diameter of 4 1mm in the long axis direction: sbg-41b.
4 Product specification series and size deviation
4. 1
Circular plastic corrugated pipe
4. 1. 1
See table 1 for specifications of circular plastic corrugated pipe.
4. 1.2
The length specification of circular plastic corrugated pipe is generally 6,8, 10m, and the deviation is 0 ~+ 10m.
Table 1 Circular plastic corrugated pipe Specification
Model anchorage with inner diameter d, outer diameter d, wall thickness s and out-of-roundness mm.
Nominal value deviation nominal value deviation nominal value deviation
SBG-50Y 50 1.0 63 1.0 2.5+0.5 6% ym 12-7
SBG-60Y 60 73 2.5 ym 12- 12 ym 15-7
SBG 75Y 75 88 2.5 ym 12- 19 ym 15- 12
SBG-90Y 90 2.0 106 3.0 ym 12-22 ym 15- 17
SBG- 100y 100 1 16 3.0 ym 12-3 1 ym 15-22
SBG- 1 15Y 15 13 1 3.0 ym 12-37 ym 15-27
SBG- 130y 130 146 3.0 ym 12-42 ym 15-3 1
4.2
Flat plastic corrugated pipe
Plastic corrugated pipe specifications are shown in Table 2.
Table 2 Flat plastic corrugated pipe Specifications
Model long axis U 1 short axis U2 wall thickness s
Nominal value deviation nominal value deviation nominal value deviation
SBG-4 1B 4 1 1.0 22 0.5 2.5+0.5
SBG-55B 55 22 2.5
SBG-72B 72 22 3.0
SBG-90B 90 22 3.0
5 technical requirements
5. 1 raw materials
Plastic corrugated pipe raw materials should use original granular raw materials, and powder and rehydrated granular raw materials are prohibited. High density polyethylene shall meet the requirements of GB/T1116, and polypropylene shall meet the requirements of GB/T 18742.6438+0.
5.2 appearance
The appearance of plastic corrugated pipe shall be smooth and uniform in color, and there shall be no cracks, bubbles, cracks, lumps and scratches on the inner and outer walls that affect the use.
5.3 ring stiffness
Plastic corrugated pipe ring stiffness should be not less than 6kN/m2.
5.4 Local lateral load
When plastic corrugated pipe bears lateral local load, the pipe surface should not be broken; After unloading for 5min minutes, the residual deformation of the pipeline shall not exceed 10% of the external diameter of the pipeline.
5.5 flexibility
After plastic corrugated pipe bends five times repeatedly according to the prescribed bending method, the special plug gauge can pass through plastic corrugated pipe smoothly, and the flexibility of plastic corrugated pipe is qualified.
5.6 Impact resistance
The maximum allowable value of true impact rate TIR in plastic corrugated pipe low temperature drop impact test is 10%.
6 test method
6. 1 test environment
The test environment conforms to GB/T 29 18, and the normal temperature is (23 2)℃.
6.2 Test samples
Before the test, the sample should be adjusted for more than 24 hours according to the test environment.
6.3 appearance
Directly observed with naked eyes, the inner wall can be illuminated with a light source.
6.4 dimensional measurement
The inner diameter and wall thickness of plastic corrugated pipe are measured according to GB/T 8806.
6.5 Out of roundness
According to GB/T 8806, the maximum and minimum outside diameters of pipelines are measured along the same section in plastic corrugated pipe, and the out-of-roundness value △d of pipelines is calculated according to the company's (1).
Among them:
Dmax-maximum outside diameter, mm;
Dmin- minimum outside diameter, mm;
Take the arithmetic average of the test results of five samples as the non-roundness.
6.6 ring stiffness
6.6. 1 sample
Take a section (300 10)mm) of samples from each of the five pipes, and both ends shall be cut flat perpendicular to the axis.
test method
According to GB/T 9647, the descending speed of the upper platen is (5 1) mm/min. When the deformation of the inner diameter in the vertical direction of the sample is 3% of the original inner diameter, record the load on the sample at this time.
Calculation of results
The test result is calculated according to Formula (2):
Where: s is the ring stiffness of the sample, kn/m2;
△Y—— 3% change in the vertical direction of the inner diameter of the sample, m;
F—— load when the inner diameter of the sample is deformed by 3% in the vertical direction, kn;
Di—— the inner diameter of the sample, m;
L-sample length, m
6.7 Local lateral load
6.7. 1 The length of the sample is1100 mm. Take a point from the groove in the middle of the sample, apply a transverse load F with a cylindrical jack with one end r = 6 mm, and it is required to reach the specified load value of 800N within 30s. Observe whether the pipe surface is broken after holding the load for 2min. After unloading for 5min minutes, measure the deformation of the outer diameter of plastic corrugated pipe at the loading place. The loading diagram is shown in Figure 3.
Fig. 3 plastic corrugated pipe lateral load test
6.7.2 Test each sample once, record the data and take the average of five samples.
6.8 flexibility
6.8. 1 Fix a sample with a length of 1 100mm vertically on the test platform, and install two arc templates as shown in Figure 4, and the arc radius r shall meet the requirements in Table 3.
Figure 4 plastic corrugated pipe Flexibility Test
Table 3 plastic corrugated pipe Flexibility
Inner diameter d, radius of curvature r, test length l, inner diameter d, radius of curvature r, test length l in millimeters.
≤90 1500 1 100 >90 1800 1 100
6.8.2 Within the range of 900mm from the upper part of the sample, bend the sample slowly to both sides to the arc template position (see Figure 4) by hand, and bend it back and forth for five times.
6.8.3 Make the plug gauge as shown in Figure 5, and observe whether the plug gauge can smoothly pass through the bellows after the sample is bent to the final position and kept bent for 2 minutes.
6.9 Impact resistance
The test temperature is (0 1)℃, and the drop weight and impact height are shown in Table 4. The test method is in accordance with GB/T 14 152.
Inner diameter, mm drop weight, kg impact height, mm.
≤90 0.5 2000
90~ 130 1.0 2000
D is the inner diameter of the circular plastic mechanical bellows;
H = 1.25dp, H 1 = 0.5dp, H2 = 0.75dp Table 4 Drop weight and impact height.
7 inspection rules
7. 1 inspection classification
Inspection is divided into factory inspection and type inspection.
7. 1. 1 ex-factory inspection
Plastic corrugated pipe must be inspected by the quality inspection department of the manufacturer before leaving the factory, with a certificate of approval attached.
The ex-factory inspection items are Chapter 4, Chapter 5, 5.2 and 5.3.
7. 1.2 type inspection
Type inspection items are all items in Chapter 4 and Chapter 5.
Type inspection shall be carried out under any of the following circumstances:
A) Trial production, finalization and identification of new products or old products transferred to other factories;
B) After the formal production, if the equipment, raw materials and technology change greatly, the product performance may be affected;
C) During normal production, check it once a year;
D) When the factory result is quite different from the last type inspection;
E) When the product resumes production after a long-term shutdown;
F) When the national quality supervision organization requires type inspection.
7.2 Group Batch and Sampling
7.2. 1 group batch
Products shall be accepted by batches, and a certain number of products with the same formula, the same production process and the same equipment shall be regarded as a batch, and the quantity of each batch shall not exceed 10000m.
sample
Product inspection is based on batches, and 5 pieces (segments) are selected for appearance quality inspection each time.
7.3 Judgment Rules
7.3. 1 appearance quality judgment
Among the five products (segments) selected in the appearance quality inspection, if three products (segments) do not meet the requirements in 5.2, the products represented by these five products (segments) are unqualified; If two (segments) do not meet the requirements, another five (segments) can be selected for testing. If two items (paragraphs) still do not meet the requirements, the batch of products is unqualified.
Reexamination judgment
After the appearance quality inspection, if all other indicators are qualified, the batch of products is judged to be qualified.
If one of the other indicators is unqualified, double samples should be taken from the product to make samples, and the unqualified items in the indicators should be reinspected. If all rechecks are qualified, the batch of products is judged to be qualified. If there is still one unqualified test result, the batch of products is judged unqualified.