娄烦—太原矿浆管道跨越的几点作法
Practices in the Aerial Crossings of Loufan-Taiyuan Slurry Pipeline
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摘要: 矿浆管道有输送介质重、压力高、磨蚀大及坡度限制严等特点, 其设计施工不同于其它类型的管道工程。娄烦—太原矿浆管道经过地形复杂的山区, 长仅102km就修建跨越12处, 而且完全是山洞间的跨越, 增大了设计施工的难度。针对跨越的具体情况, 从技术合理、投资节省和施工简便等方面综合考虑, 采用了下述几点作法: 因地制宜, 采用高点锚固墩, 省去铁塔, 减小施工难度; 用抗风索及平衡索减轻因荷载轻、重交替作用对管道起伏变化的影响, 改善管道受力状态; 采用梁式和轻型托架的组合结构, 达到增加跨距, 减少建墩数量的目的, 同时可解决管桥下净空不够的问题; 用隧道管道吸收因跨越温差引起的管道伸缩变形, 使管道具有较大的移动自由度。Abstract: Slurry pipeline, which is different from pipelines of other types both in design and in construction, is characterised by heavy medium transported, high operating pressure, massive abrasion and strict slope restrains. Loufan-Taiyuan Slurry Pipeline, located in rocky areas, has 12 gully crossings over its total length of 12 km. To meet construction challenges, the following practices are exercised, based on local conditions and supported by feasible technologies: ①install anchor blocks at high points to replace towers, so as to facilitate construction; ②use windguard and counter cables to reduce pipe shaking due to alternating load variation; ③adopt the combined structure of beam and light support to extand the span, reduce the number of support blocks and make best use of the insufficient clearance under the pipe bridge; ④compensate the thermal distortion of the span by tunnel pipeline sections, thereby keeping the pipeline relatively free.