DN300球墨铸铁内自锚管接口设计及生产实践

根据非开挖管道能穿越公路、河流、建筑物等优点,结合球墨铸铁外自锚管接口结构,设计了DN300球墨铸铁内自锚管接口形式,制定了生产工艺要求,对铸管成分、力学性能进行了检测,接口做了型式试验。结果显示,各项技术指标完全符合设计要求及GB13295-2019的规定,对国内同类球墨铸铁内自锚管接口设计及生产具有借鉴作用。

球墨铸铁管小管径内自锚式接口设计及生产

管线安装时,球墨铸铁管为滑入式(T型)柔性接口,因为不能承受轴向拉力,管道防止滑脱的能力差,且经常会遇到地基的不均匀沉陷、转弯处无法安装支墩等的现实情况,因此,解决接口的防拔脱问题就显得非常重要。随着大管径外自锚式接口已经在市场上成功应用,如何解决小管径自锚式接口是当下急需解决的问题。

球墨铸铁管水平定向钻施工技术工程应用

随着我国城市空间日趋拥挤,非开挖施工技术之一的水平定向钻施工技术的工程应用也越来越普遍。总结了上海临港区渔港路消火栓补建工程的实际案例应用情况,介绍了球墨铸铁管水平定向钻施工的技术要点。

Simplified design of rock cavern concrete lining to resist shock loading

A simplified method was proposed for the design of concrete lining in underground rock cavern/tunnel against shock loading. The loading may result from the detonation of explosives on ground surface or ground penetration projectiles exploding adjacent to the cavern/tunnel. The resulting problem necessitates the solution of the dynamics of a beam loaded by a transient pressure uniformly distributed over the span. According to mechanical characteristics of the system with rock bolt and shotcrete, a dynamic support design method based on equivalent single degree of freedom （SDOF） was put forward. The SDOF method was applied to obtaining the maximum displacement at the mid-span of the beam, which is often the controlling factor in the blast-resistant design. In the formulation of the problem, the proposed method combines the phenomena of spalling and structural dynamics theory. An example is provided to demonstrate the applicability of this simplified method.

大口径球墨铸铁管在沉管施工中的创新性应用

长期以来,钢管在国内大口径过河管沉管施工中被广泛应用,但其防腐施工要求高,焊缝防腐质量控制难度大,限制了管道的使用寿命,增加了运维成本和漏损风险。无锡严埭河DN800给水管沉管工程经过力学性能、耐腐蚀性和电蚀性、综合性价比以及接口形式等多方面分析比较,最终选择采用SIA Wb型内自锚接口球墨铸铁管作为管材,并对影响工程成功实施的3个要点——吊点设置间距、接口结构安全和胶圈有效性以及管道弯头处加固处理进行分析总结,可为今后类似工程实施提供借鉴。