GB/T 35451.2-2018Polypropylene structure-wall piping systems for underground drainage and sewerage - Part 2: Polypropylene spirally enwound structure-wall pipes (English PDF)

3.1 Terms and definitions The following terms and definitions as defined in

GB/T 19278-2018 apply to this document.

3.1.1 Winding structural wall pipe spiralyenwoundstructured-walpipes Structural wall tubing made by a winding process.

Note. The wall structure made by different winding processes is different. For example. A-type structural wall tube (shown in Figure 2), B-type structural wall tube (shown in Figure 3) is usually preheated The monolithic core mold is wound and the inner wall is smooth.

3.1.2 Fitting fitting Articles made by secondary processing of thermoformed parts and/or several pipe sections (which can be used with solid walled tubes).

3.1.3 Nominal size DN/ID nominalsizeDN/ID DN/ID The nominal size associated with the inner diameter.

3.1.4 Any point outside diameter outsidediameter(atanypoint) De The outer diameter measured by the cross section of any point of the pipe.

Note. For structural wall tubing, the outer contour of the cross section may not be circular (eg spiral wound tubes) or circular of equivalent size (eg double wall corrugations) Tube or structural wall tube with ring ribs), where the outer diameter of the tube is theoretically defined as the smallest cylindrical surface that can accommodate the tube body (excluding the socket) path. For ease of use, it can also be technically defined as the sum of the inner diameter and the double structural height.

3.1.5 Any point inside diameter insidediameter(atanypoint) Di The distance between the line passing the center of the circle and the two intersections of the inner surface of the section in the cross section perpendicular to the axial direction of the pipe member.

3.1.6 Mean inner diameter meininsidediameter Dim The arithmetic mean of two or more inner diameter measurements that are perpendicular to each other on the same section.

3.1.7 Any point wall thickness walthickness (atanypoint) The distance between the inner and outer walls at any point on the pipe or fitting.

Note. For multi-layer tubes or structural wall tubes, the wall thickness of each layer or different parts may have different design values, and the qualifiers may be added to clarify the position of the measurement. Such as the overall wall thickness, inner wall thickness, outer wall thickness, core wall thickness, reinforcement layer wall thickness and so on.

3.1.8 Structure height constructionheight Ec The radial distance between the inner and outer surfaces of the pipe wall (A-shaped structural wall pipe), or between the inner surface of the pipe wall and the top end of the rib (B-shaped structural wall pipe).

3.1.9 Inner wall thickness walthicknessoftheinsidelayer E

4 The wall of the B-shaped pipe has a wall thickness at any point between the ring ribs.

3.1.10 Wall thickness under the inner wall thickness walthicknessoftheinsidelayerunderaholowsection E

5 The wall thickness between the inner wall and the inner surface below the cavity portion of the A-type pipe.

3.1.11 Nominal ring stiffness SN The nominal value of the ring stiffness, usually a convenient round integer, represents the minimum specified value of the ring stiffness. [

GB/T 19278-2018, definition 2.4.3]

3.2 symbol The following symbols apply to this document. A joint length, or the maximum draw length in the sealed state Di socket diameter Dim,min minimum average inner diameter of the socket De OD Dem average outer diameter Di inner diameter Dim average inner diameter e pipe wall thickness (excluding structural height) Ec structure height E1 socket wall thickness E2 wall thickness E3 wall thickness at the seal ring groove E4 inner wall thickness E5 inner wall thickness under the cavity part F The distance between the end of the socket and the effective solder joint L pipe effective length L1,min minimum fusion length of fused connection Design length of Z1 pipe fittings Design length of Z2 pipe fittings Design length of Z3 pipe fittings rho density

3.3 Abbreviations The following abbreviations apply to this document. MFR melt mass flow rate (meltmass-flowrate) OIT oxidation induction time (oxidationinductiontime) PP polypropylene SN nominal ring stiffness (nominalringstiffness) TIR real impact rate (trueimpactrate)

4.1 Raw materials The raw material is mainly a copolymerized polypropylene (PP-B) base resin, and only additives necessary for improving the properties thereof can be added. Polypropylene tree The lipid content (mass fraction) should be above 95%.

4.2 Material properties The raw materials should meet the requirements of Table 1. For other requirements, see Appendix A. Table

1 Raw material properties Serial number item Claim Basic resin material Test parameter test method

1 Density rho/(kg/m3) 895 <= rho <= 915 <= <= <= <= <= test temperature 23 ° C GB/T 1033.1-2008, Method A

6.1 Structural form of pipe

6.1.1 Type A structural wall tube a flat inner and outer surface with a spiral cavity structure separated by continuous threaded ribs between the inner and outer walls (a typical schematic view is shown in Figure 1); or A spiral hollow tubular structure is embedded between the inner and outer walls (a typical schematic view is shown in Fig. 2). A typical A-shaped structural wall tube is shown in Figure 1 and Figure 2. Figure

7.3 Geometric dimensions

7.3.1 Length The effective length (L) of the pipe is generally 6m, and other lengths are agreed upon by the supplier and the buyer. The length is not allowed to have a negative deviation.

7.3.2 Inner diameter and wall thickness The minimum average inner diameter of the A and B pipes is dim,min, and the minimum inner wall thickness e5,min under the cavity portion of the A-shaped pipe (see Figure 1, Figure 2), B The minimum inner wall thickness e4,min (see Figure 3) and the minimum joint length Amin (see Figure 4) of the pipe shall comply with the requirements of Table 3. Electric fusion The welding length (L1) should not be less than 45mm. Table

3 Inner diameter, wall thickness and joint length are in millimeters Nominal size DN/ID Minimum average inner diameter Dim,min Wall thickness Type A E5,min Type B E4,min Minimum joint length a Amin 200 195 1.1 1.5 54 300 294 1.7 2.0 64 400 392 2.3 2.5 74 500 490 3.0 3.0 85 600 588 3.5 3.5 96 800 785 4.5 4.5 118 1000 985 5.0 5.0 140 1200 1185 5.0 5.0 162 1300 1285 5.0 6.5 - 1400 1385 5.0 7.0 - 1500 1485 5.0 7.5 - 1600 1585 5.0 8.0 - 1700 1685 5.0 8.5 - 1800 1785 5.0 9.0 - 1900 1885 5.0 9.5 - 2000 1985 5.0 10.0 - 2100 2085 5.0 10.0 - 2200 2185 5.0 10.0 - 2300 2285 5.0 10.0 - 2400 2385 5.0 10.0 - 2500 2485 5.0 10.0 - 2600 2585 5.0 10.0 - 2700 2685 5.0 10.0 - 2800 2785 5.0 10.0 - 2900 2885 5.0 10.0 - 3000 2985 5.0 10.0 - 3100 2085 5.0 10.0 - 3200 3185 5.0 10.0 - Table 3 (continued) Unit is mm Nominal size DN/ID Minimum average inner diameter Dim,min Wall thickness Type A E5,min Type B E4,min Minimum joint length a Amin 3300 3285 5.0 10.0 - 3400 3385 5.0 10.0 - 3500 3485 5.0 10.0 - 3600 3585 5.0 10.0 - a When DN/ID >= 600, the minimum joint length can be less than the requirements in Table 3, but the minimum should not be less than 85mm, and the "short socket" is marked on the pipe.

7.3.3 Wall thickness of socket and socket In the case of a pipe with a solid wall socket and/or a socket, the wall thicknesses e1, min, e2, min and e3, min shall comply with the requirements of Table 4. Table

4 The minimum wall thickness of the solid wall socket and socket is in millimeters Nominal size DN/ID Minimum socket wall thickness E1,min Minimum socket wall thickness E2,min Minimum wall thickness at the seal E3,min DN/ID <= 500 de/41, and >= 3.4 (de/41) × 0.9 (de/41) ×

0.75 DN/ID >500 12.2 10.4 9.2

7.4 Physical properties The physical properties of the pipe shall comply with the requirements of Table 5. Table

5 Physical properties of pipes Serial number project requirements test parameter test method

8.7 Longitudinal retraction rate

8.7.1 Sample Test according to Method B specified in GB/T 6671-2001. Cut three samples from different parts of a pipe. The length of the sample is (200 ± 20) mm. When the pipe DN/ID< 400mm, it can be cut into two test pieces of the same size along the axial direction; the pipe DN/ID>=400mm In time, it can be cut into four (or more) test pieces of the same size along the axial direction.

8.7.2 Test The sample was placed when the oven temperature was raised to 150 ° C. The samples were placed in contact with each other and not in contact with the oven wall. Waiting oven temperature back Start timing when rising to 150 ° C, maintain the oven temperature (150 ± 2) ° C, the sample heating time in the oven is as follows:

--- ec <= 8mm, 30min;

---ec >8mm, 60min.

8.8 Oven test

8.8.1 Sample Three sections of the sample were cut from different parts of a pipe, and the length of the sample was (300 ± 20) mm. When the pipe DN/ID< 400mm, Cut into two specimens of the same size along the axial direction; when the pipe DN/ID >= 400mm, it can be cut into four (or more) pieces of the same size along the axial direction. Test block.

8.8.2 Test procedure The sample was placed when the oven temperature was raised to 150 ° C. The samples were placed in contact with each other and not in contact with the oven wall. Waiting oven temperature back Start timing when rising to 150 ° C, maintain the oven temperature (150 ± 2) ° C, the sample heating time in the oven is as follows:

---e4<=8mm, 30min;

---e4 >8mm, 60min.

Note 1. When the sample is placed horizontally, a layer of talc, fine sand or small glass balls can be placed under the sample.

Note 2. After the sample is placed, the oven temperature is returned to the test temperature range within 15 min, ie (150 ± 2) °C. After heating to the specified time, the sample was taken out from the oven, cooled to room temperature, and examined for cracking and delamination and other defects.

Note 3. Allow the sample to cool in air until it can be touched by hand.

Note 4. Refer to GB/T 8803-2001 for the test method.

8.9 Ring stiffness Test according to GB/T 9647-2015. When the pipe DN/ID >500mm, take a sample from the pipe and rotate it. The 120° test was performed once, and the arithmetic mean of the test results was taken three times.

8.10 Impact performance For samples with pipe DN/ID <= 500mm, test according to GB/T 14152-2001. When the pipe DN/ID >500mm, it can be cut The block was tested. The test block size is. length (200 ± 10) mm, inner chord length (300 ± 10) mm, B-type pipe at least one complete rib. During the test, the test piece should have an outer surface arc upward, and both ends should be placed horizontally on the bottom plate. The B-shaped pipe ensures that the impact point is the top end of ...

12.5 SN

16 Nominal ring stiffness/(kN/m2) 2 4 6.3 8 12.5 16 a Only for pipes with DN/ID >= 500mm.