碗口脚手架和军用器材组合应用于现浇箱梁技术.rar

碗口脚手架和军用器材组合应用于现浇箱梁技术

在跨路现浇箱梁施工中，膺架法施工是常用的一种方法。利用现有制式器材进行施工，一方面节约了临时工程的投入，同时又使大量库存的战备器材得到了合理利用，一定程度上避免了资源的浪费，但是，军用支墩和军用梁作为现浇梁膺架时，由于军用梁截面尺寸大，从而影响桥下净空，这种情况下，常常采用高位现浇而后落梁的施工方案，这就增加了高位落梁的工序，安全隐患较大。与军用器材相比，满堂脚手架具有安装方便、受力均匀的优点，但是对于跨路箱梁的施工，不能满足车辆通行的要求，具有一定的局限性。我单位在马田中桥的施工中，在总结几座桥施工的经验教训的基础上，大胆创新，对专家指导下制定的施工方案进行了优化，采用军用支墩和碗扣式脚手架组合形成膺架进行现浇的施工方案，从而减少了高位落梁的工序，减少了安全隐患。同时，缩短了工期，减少了投入，取得了显著的社会效益和经济效益。
1 工程概况
秦沈客运专线B28-9标段马田中桥位于该线路里程DK86+942.46处，设计为1孔24米双线PC简支箱梁。箱梁设计为单端张拉，梁高2.0m，底板宽度6.52m，桥面宽度12.4m。混凝土方量为212.6m,重量达520吨。该处线路坡度为5‰。因秦沈线为客运专线，设计时速高，考虑到旅客舒适度等原因，设计上对于梁体线性要求很高，因此施工时预拱度必须设置合理。
桥梁下部桥台为其他施工单位施工，设计为双线耳墙式桥台，扩大式基础，基础所处地质较好，主要为砂粘土，地基承载力在150Kpa~200KPa
Wankou scaffolding and military equipment combination in situ box girder

Cast in a cross-road construction, Construction Scaffolding Method is a method commonly used. Use of existing standard equipment for construction, while investment in temporary works savings, while keeping the combat readiness of a large number of stocks are a reasonable use of equipment, to some extent to avoid the waste of resources, but the military and military-beam as the cast strut Beam Scaffolding, because of large military dimension of beam section, thus affecting the bridge clearance, in which case, often using high beam in place and then off the program, increasing the high drop-beam process, a greater security risk . Compared with the military equipment, scaffolding packed with easy installation, even the merits of stress, but the box for cross-road construction, can not meet the requirements of vehicular traffic, with some limitations. I units in the Paul Martin in the bridge construction, bridge construction in the summing up several lessons learned, based on bold innovation, developed under the expert guidance of the construction program has been optimized, using military buttress and the formation of scaffold composition Ying place holder for the construction program, thereby reducing the high drop-beam processes, reducing security risks. At the same time, shorten the construction period, reduced investment, and achieved remarkable social and economic benefits.
1 Project Overview
Shenyang Dedicated Passenger Line B28-9 in the bridge is located in the Martin Lot Length of DK86 +942.46 Office, designed for a two-hole 24 m PC box girder. Box designed for single-ended tension, high beam 2.0m, bottom width of 6.52m, deck width of 12.4m. Concrete side volume 212.6m, weighing 520 tons. Where line gradient 5 ‰. Shenyang line for passenger lines, the design of high speed, taking into account passenger comfort and other reasons, the design requirements for high beam linear, so construction of the camber must be set reasonably.
Lower bridge abutment construction for the other construction unit, designed to double ear abutment wall, the expansion of foundation, the geological basis of good, mainly sandy clay, the foundation bearing capacity in 150Kpa ~ 200KPa