渗水环境下超长超厚外墙单侧支模综合施工技术
2017-09-18曲贵阳武雄飞袁渊
曲贵阳+武雄飞+袁渊
摘 要:成都国金中心工程基坑深度达30多米,面积达45000平米左右,是目前成都市乃至四川省单层面积最大,深度最深的基坑。由于工程地处繁华市区,业主为尽可能利用土地资源,其建筑边线紧邻基坑支护边。地下室外墙总长度1016米,墙厚度为1000mm,除红星路一侧260米墙体外其他外墙距离基坑护壁约200mm左右,需要进行单侧支模。且由于现场客观地质条件原因,基坑开挖后护壁渗水严重,给外墙施工都带来了更大难度。项目部经过讨论研究,最终通过巧妙应用白铁皮,合理设置暗排水沟,水流得到合理的疏导,设置砖胎膜,克服了渗水环境下超长超厚地下室外墙单侧支模和外墙防水施工困难问题,确保了地下室外墙施工质量和工程进度。
关键词:单侧支模; 白铁皮; 盲沟; 砖胎膜
【文章编号】1627-6868(2017)08-0041-03
Abstract: Chengdu Golden State Center foundation pit depth of 30 meters, covering an area of 45000 square meters, is currently the Chengdu City and Sichuan Province monolayer area is the largest, most deep foundation pit depth. Because the project is located in the bustling urban area, the owners for the possible use of land resources, the construction side adjacent to the foundation pit side. Exterior wall of basement of a total length of 1016 meters, wall thickness of 1000mm, except the red side of the road 260 meters of wall of other external distance retaining around 200mm, the need for unilateral formwork. Because the site geological conditions and objective reasons, after excavation of foundation pit retaining wall construction serious water, to bring greater difficulty. Project department through discussion and research, through the ingenious application of white iron sheet, setting reasonable dark drain, water gets reasonable dredge, provided with a brick membranes, to overcome the water environment of super long thick basement exterior wall formwork and exterior wall waterproof construction difficulties, to ensure that the basement exterior wall construction quality and progress of the project.
Key words: unilateral formwork, white metal, blind ditch, brick membrane.
1.工程概况
成都国际金融中心由5层地下室、6层(局部7层)商业裙楼、1#、2#办公楼、3#住宅楼和4#酒店及住宅楼组成,总建筑面积763718㎡,地下室建筑面积227712㎡。本工程基坑面积45000多平米,开挖深度约为30米,塔楼局部位置深度达36m,是目前成都市乃至四川省单层面积最大,深度最深的基坑。场地地下水类型为砂卵石层中的空隙潜水和赋存于基岩中的裂隙水,水量丰富,地下水位埋藏平均深度为6.43米。地下室外墙总长度1016米,墙厚度为1000mm,除红星路一侧260米墙体外其他外墙距离基坑护壁约200mm左右,空间狭小。
地下室外墙(除红星路一侧)紧邻支护桩侧壁,采用单侧支模。由于地质条件限制,现场降水井有效降水深度只能体现在卵石层,岩层内的裂隙水无法通过降水井充分抽排,通过设置止水帷幕对源源不断的裂隙水进行疏导排流。……
