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??????????? UDC 678.74-46?620.172 GB 8804.1?88 ??????????????? ?????? 1 ???? ???????????????????????? 2 ?? 2.1 ??????? ????????????????????1??????????1?????????2???????2? ?1 ?????? mm ?? ?? ?? ?? L3 ????? ??? ? b1 ???? ?? ±1 L1 ?????? ?? ±2 b ?????? ? ±0.4 r ??? ?? ±1 R ??? ?? ±2 ?2 ???????? mm ?? ?? ?? ?? L3 ????? ??? 115 ? b1 ???? 15 ? L1 ?????? 33 ±2 b ?????? 6 ±0.4 r ?? 14 ±1 L0 ????? 25 ±1 L2 ??????? 80 ±5 d ?? ???? ? 2.2????? 2.2.1 ???? ???????63mm?????????150mm???5?????????1?? ????63mm??????????150mm???1???????????????????????1????3????? ???????3? ?3 ???? ????mm 75?250 280?400 450?630 710?1000 ????????? 5 7 10 16 2.2.2 ???? 2.2.2.1 ??????????????????????????? 2.2.2.2 PVC-U?????PVC?? ?????????12mm????????????????1????????2??????? ??????12mm???????????????? 2.2.2.3 PVC-C?PVC/PVC-C???? ???????????? 2.2.3 ???? 2.2.3.1 ???? ????????????125?130???????????????????????1min???????????????????????????????????????? 2.2.3.2 ?????? ???????110mm????????????????????????? PVC-UT?????PVC???125?130????????PVC-C?PVC/PVC-C?????135?140?????????????????????????1min? ????110mm???????????????????????????????????? 2.2.4 ?????? ?????????23±2???????????4h? 3 ???????? 3.1 ????? ?????????????±1%??? 3.2 ???? ?????±2???? 3.3 ????????? 3.4 ???? 3.5 ?????????????????? 4 ???? 4.1 ??????23±2?? 4.2 ??????????????0.01mm. 4.3 ?????????,?????????????????????????????????? 4.4 ?5±1mm/min???????,??????,?????????????????????????,??????????,?????????????. 4.5 ????????????????2??????? 5 ???? 5.1 ????????????????1???? S=F/A..........................(1) ??:S????????????????MPa? F???????????????N? A?????????????????mm2? 5.2 ????????2???? ..........................(2) ????????????%? L?????????????mm? L0????????????mm? 5.3 ?????????????????????????? 6 ???? ???3???? ........................(3). ??????????? X???????? ?????????????? n???????? 7 ???? ???????????? a. ??????????? b. ?????? ? c. ?????????????? d. ????? e. ????????????????? f. ???????? ???????????1988-02-13?? 1988-07-01
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