门式支墩贝雷梁在满堂支架中的应用

史艳　吴梓敬

摘  要：为在高墩现浇箱梁满堂支架中节约支架材料用量并方便搭设和拆除。将较高满堂支架的下部采用钢管支墩作为立柱，柱顶横桥向安装分配梁，分配梁顶设置顺桥向贝雷梁，贝雷梁顶横桥向布置系统分配梁组成下部支撑平台。上部采用满堂支架作为调平和过度层支撑模板系统。该种支架搭设方案节约钢材，在33m高20m跨度的三车道现浇箱梁中节约钢材约50%，且该种支架的搭设和拆除较为方便快捷，具有一定的推广应用价值。

关键词：满堂支架;经济效益;贝雷梁;门式支墩

中图分类号：U445.4        文献标志码：A         文章编号：2095-2945（2020）23-0170-02

Abstract： In order to save the amount of support material and facilitate the erection and removal of cast-in-place box girder supports with high piers， the lower part of the higher full scaffold is made of steel pipe piers， and the horizontal bridge at the top of the column is installed with a distributed beam. The beam at the top of the distribution beam is arranged with a bridging-to-beret beam， and the beam at the top of the beret beam is arranged with a distributed beam to form the lower support platform. The upper part adopts the full scaffold as the tunable and transitional support formwork system. This kind of bracket construction scheme saves steel， which can save about 50% of steel in the three-lane cast-in-place box girder with a height of 33m and a span of 20m. Besides， it is convenient to be built and dismantled， which has certain promotion and application value.

Keywords： full scaffold; economic benefits; Bailey beam; portal pier

1 概述

隨着高速公路大规模建设，特别是山区立交互通大多都是现浇箱梁桥，施工方法上多采用满堂支架作为下部支撑系统。但对于高墩柱需要大量的支架材料，同时搭设和拆除的人工机械费用也相应增加。为节约满堂支架采用和相应搭拆费用，对于超过20m的支架采用钢管立柱和贝雷梁组成下部支撑系统，贝雷梁上通过系统分配梁构成上部满堂支架的搭设平台，可以大量节约满堂支架搭设高度，从而减少现浇箱梁支架措施费用。

2 门式支墩支架搭设方案

以云南某高速公路立交互通高墩现浇箱梁为例。该现浇箱梁主线为三车道，共计10联10×（3×20m）现浇箱梁，其中第一联（3跨）墩高33m。下部采用钢管立柱和贝雷梁组成满堂支架受力平台。一跨20m现浇箱梁的下部支架以2排横向钢管立柱作为竖向受力构件。单排钢管立柱顶面横桥向布置工字钢作为分配梁，在分配梁上搭设顺桥向贝雷梁，组成梁柱式支墩体系（门式支墩），贝雷梁上通过系统分配梁和满堂支架搭设至箱梁底面用于支撑模板系统。……