直埋供热管道水平转角段设计

文中根据《城镇直埋供热管道工程技术规程》中的直埋水平转角管段应力验算方法,对直埋水平转角管段的受力情况进行了分析,并结合工程实例,采用弹性抗弯铰解析法,通过改变不同的设计参数,对直埋供热水平转角管段的受力情况进行了计算。通过对计算结果的分析,明确了影响弯头应力的主次因素,发现弯头的曲率半径、管顶埋深、管径和循环工作温差对直埋供热水平转角弯头的应力有不同程度的影响,且影响的规律不同。通过计算,绘制了部分工况下的应力图,可以直接在图上查找相应数据,对进一步优化直埋供热管网布置,提高管网可靠性,降低投资,具有借鉴意义。

Design of Horizontal Angle Section of Directly Buried Pipeline

The stress distribution of a horizontal angle section in directly buried pipeline has been introduced and analysed,according to the technical specification for directly buried heating pipeline engineering in cities. Combined with engineering example,the stress of horizontal angles with different design parameters has also been calculated,using an elastic flexure hinge analytic method. Through analysis of the calculational results,the factors that affect the bend stress to varying degrees are specified. The results also suggest that the radius of the curvature of the bend,the depth of the overlaying soil,the pipe diameter and the temperature difference of the cycle operation,all have different levels of effects on the stress of the horizontal angle section in directly buried pipeline. A stress diagram under a series of working conditions has been drawn out in light of the calculations,so the users can look up the data directly in the figure. This is of guiding significance for a further optimization of the directly buried heating pipe network,for a further improvement of the network reliability,for a reduction in investment.