指出了在供回水立管中间设置伸缩节存在的问题。
Points out problems in setting expansion joints for supply and return water risers.
理论分析和实际应用表明，在引出管满足径向补偿要求和支架做法满足要求的条件下，可以不设立管伸缩节。
Theoretical analyses and practice show that it is not need to set expansion joints when the out pipe meets the radial compensation requirement and the support meets the requirement.
着重讨论塑料管材用橡胶圈(RR)伸缩节机械胀管模具。
The mechanical expansion pipe mould used for plastic RR reciprocal joint was discussed in detail.
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