沪通长江大桥主航道桥钢沉井增压助浮方案

发布时间：2018-03-01 19:23

本文关键词： 公路铁路两用桥斜拉桥钢沉井整体浮运增压系统桥梁施工　出处：《桥梁建设》2015年06期 　论文类型：期刊论文

【摘要】：沪通长江大桥主航道桥为(140+462+1 092+462+140)m双塔连续钢桁梁斜拉桥,该桥主墩均采用沉井基础,其中,29号主墩沉井顶平面尺寸为86.9m×58.7m,平面布置24个井孔,高115m,下部钢沉井高56m。钢沉井在自浮状态下,吃水深度12.5m,存在无法出坞、浮运时搁浅的风险,为了减小钢沉井吃水深度,保持气舱内压力稳定,提出了增压助浮方案,即对称封闭12个井孔,形成密闭气舱,同时设置主动增压系统,由井孔封闭盖板顶面向封闭气舱内加压注气的方案。增压系统由空压机、主供气管、分供气管、支供气管、气压表、止回阀、截止止回阀及液位传感器组成,通过增压充气和减压放气2个措施,控制各个气舱内的压力。采用该方案后,29号主墩钢沉井从出坞到浮运到墩位处仅用了3h,实施效果良好。
[Abstract]:The main waterway bridge of Hutong Yangtze River Bridge is a cable-stayed bridge with continuous steel truss beams with two towers of 140462 092 462 140m. The main pier of the bridge adopts caisson foundation. The top plane size of the caisson of 29 main pier is 86.9 m 脳 58.7 m, and 24 boreholes are arranged on the plane. Under the condition of self-floating, the draft depth of the steel caisson is 12.5m. there is the risk of being unable to get out of dock and running aground when floating. In order to reduce the draught depth of the caisson and keep the pressure in the gas tank stable, a pressurization and floatation aid scheme is put forward in order to reduce the draught depth of the caisson and maintain the pressure stability in the gas tank. That is to say, 12 well holes are symmetrically closed to form a closed air tank, and at the same time an active pressurization system is set up. The pressurized system consists of an air compressor, a main supply pipe, a separate supply pipe, a supply pipe and a supply pipe from the top of the sealing plate of the well hole facing the pressurized gas injection inside the sealed gas chamber. The barometer, check valve, cut-off check valve and liquid level sensor are made up of two measures: pressurized inflation and decompression. After adopting this scheme, the steel caisson of No. 29 main pier took only 3 hours from dock to floating to the pier, and the effect was good.
【作者单位】：中铁大桥局集团第二工程有限公司;中铁大桥局集团有限公司;
【基金】：中国铁路总公司科技研究开发计划项目(2013G001-A-2)~~
【分类号】：U445.4

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