盖梁抱箍法施工及计算

如果有几种的话,最好是都付上 不盛感激!!
2024-12-23 02:49:23
推荐回答(1个)
回答1:

一. 施工设计说明1、概况:本标段全长12.285km,共设置大桥1座,中桥5座,分离式立交桥(含互通主线桥)7座,小桥1座。其中下构为墩柱式盖梁结构的桥梁有大岭互通主线1号桥、大岭互通主线2号桥、刘屋村中桥、陈屋村中桥、东坑水库大桥、墩子头中桥、姚光村中桥、瓦窑岗中桥、赤沙分离式立交桥、东边迳分离式立交桥、大白小桥。由于地基承载力不足及水中墩盖梁施工困难,所以本桥盖梁采用抱箍法施工。本次计算选择本标段单位跨度盖梁自重最大的大岭互通主线2号桥54#墩左幅盖梁为例,验算盖梁施工中的抱箍应力是否达到施工要求。54#墩为双柱式桥墩,墩柱中心距离为9.70m,上方盖梁长16.227m,宽2.3m,高1.8m,砼浇筑量为62.88m3。2、设计依据(1) 交通部行业标准,公路桥涵钢结构及木结构设计规范(JTJ025-86)(2) 路桥施工计算手册 人民交通出版社(3) 五金手册 饶勃主编(4) 公路施工手册,桥涵(上、下册)交通部第一公路工程总公司(5) 盖梁模板提供厂家提供的模板有关数据(6) 我单位的桥梁施工经验二. 盖梁抱箍法结构设计1、 侧模与端模支撑 侧模为特制大钢模,面模厚度为δ6mm,肋板高为10cm,在肋板外设 [10背带。在侧模外侧采用间距为1m的[10竖带,竖带高2.1m;在竖带上下各设一条Ф16的栓杆作拉杆,上下拉杆间间距为1.9m ,在竖带外设Ф48的钢管斜撑,支撑在横梁上。端模为特制大钢模,面模厚度为δ6mm,肋板高为10cm,在肋板外设[10背带。端模外则由特制三角架背带支撑,空隙用木楔填塞。2、 底模支撑底模为特制大钢模,面模厚度为δ8mm,肋板高为10cm。在底模下部采用间距0.4m工16型钢作横梁,横梁长为4.5m。盖梁悬出端底模下设三角支架支撑,三角架放在横梁上。横梁底下设纵梁。横梁上设钢垫块以调整盖梁底2%的横向坡度与安装误差。与墩柱相交部位采用特制钢支架作支撑。3、 纵梁在横梁底部采用两根45#工字钢作为纵梁,单根纵梁长19m。纵梁在墩柱外侧用[10槽钢连接,使纵梁形成整体,增加稳定性。横梁与纵梁采用U型螺栓连接;纵梁下为砂箱和抱箍。4、 砂箱和抱箍砂箱采用板厚t=16mm钢板制作,砂箱为40*30cm,每个砂箱设有泄砂孔。制作砂箱前,砂先烘干后装箱,每个砂箱预压600KN。抱箍采用两块半圆弧型钢板(板厚t=16mm)制成,M24的高强螺栓连接,抱箍高50cm,采用16根喷砂后涂无机富锌漆的16Mn钢高强螺栓连接。抱箍在墩柱上产生摩擦力提供上部结构的支承反力,是主要的支承受力结构。 为了提高墩柱与抱箍间的摩擦力,同时对墩柱砼面保护,在墩柱与抱箍之间设一层2~3mm厚的橡胶垫。5、 工作平台与防护栏杆(1)工作平台设在横梁悬出端,在横梁上铺设2cm厚的木板,木板与横梁之间采用铁丝绑扎牢靠。(2) 工作平台栏杆采用Ф50的钢管搭设,在横梁上每隔2m设一道1.2m 高的钢管立柱,竖向间隔0.5m设一道钢管立柱,钢管之间采用扣件连接。立柱与横梁的连接采用在横梁上设0.2m 高的支座。钢管与支座之间采用插销连接。

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