XJJ146-2022：预制保温直埋球墨铸铁热水管技术规程

XJJ146-2022······1

1 总则······6

2 术语与符号······7

2.1 术语······7

2.2 符号······9

3 基本规定······13

4 管道、管件及附件······15

4.1 一般规定······15

4.2 工作管······15

4.3 保温层与外护管······18

4.4 连接管件······19

5 管道布置与敷设······22

5.1 管道布置······22

5.2 管道敷设······24

5.3 管道连接方式······24

5.4 管道附件与设施······25

5.5 管道保温计算······26

5.6 管道水力计算······27

6 固定墩设计······29

6.1 管道对固定墩的作用······29

6.2 回填土对固定墩的作用······29

6.3 固定墩应力验算······31

7 管道应力验算······34

7.1 柔性连接管道应力验算······34

7.2 柔性-刚性混合连接管道应力验算······37

7.3 热伸长计算······40

8 管道安装······42

8.1 一般规定······42

8.2 沟槽开挖······43

8.3 管道安装与检验······45

8.4 接口保温······48

8.5 沟槽回填······50

9 试验、清洗、试运行、验收······52

9.1 试验与清洗······52

9.2 试运行······55

9.3 验收······56

10 维护与检修······57

附录A 球墨铸铁管性能表······60

附录B K级球墨铸铁管壁厚和工作压力······61

附录C 密封橡胶圈性能表······63

附录D 新疆主要城市地温月平均值······64

附录E 固定墩、固定支架承受的推力计算······69

本规程用词说明······71

引用标准名录······72