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首页> 外文会议>SEAOC 2008 convention proceedings >A Case Study for Up-Down Design and Construction Methodology for a High-Rise Development in Los Angeles, California
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A Case Study for Up-Down Design and Construction Methodology for a High-Rise Development in Los Angeles, California

机译：加利福尼亚洛杉矶高层建筑上下设计和施工方法的案例研究

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摘要

Over the past few years, numerous high-rise projects have been initiated in downtown Los Angeles. In most cases, at least one and often two or more subterranean levels are constructed. Conventional construction sequencing would consist of shoring installation, mass excavation, and construction of the below-grade structure all prior to construction of the building superstructure.rnFor a high-rise project currently under construction in downtown Los Angeles, an alternative sequence, referred to as 'up-down' (or 'top-down') was used to reduce the duration of the overall construction schedule. Up-down sequencing typically allows the construction of the building superstructure in tandem with mass excavation and construction of the below-grade levels. The subject project includes a 23-story tower over three subterranean levels and has a building footprint of approximately 60,000 square feet. A modified up-down sequence was implemented in which the installation of basement walls and below-grade foundations and the initiation of superstructure preceded mass excavation and basement floor construction. The project utilized steel sheet pile as both the temporary shoring and permanent basement wall construction - a first in California.rnThe benefits of up-down construction, the sequence employed by this project, and the innovative structural and foundation design and construction methods devised to facilitate its adoption, are discussed herein.
机译：在过去的几年中，洛杉矶市中心发起了许多高层建筑项目。在大多数情况下，至少会构建一个地下层次，通常是两个或更多个层次。常规的施工顺序包括在建筑上部结构施工之前进行支护安装，大面积开挖和地下结构的施工。对于在洛杉矶市中心目前正在施工的高层项目，另一种顺序称为“ “自上而下”（或“自上而下”）用于减少总体施工进度的持续时间。上下顺序通常允许建筑上部结构与大规模开挖并排建造地下层。该主题项目包括一个位于三个地下层的23层高的塔楼，建筑占地面积约为60,000平方英尺。实施了修改后的上下顺序，其中地下室墙和地下基础的安装以及上部结构的启动先于大体积开挖和地下室地板的施工。该项目将钢板桩既用作临时支撑墙又用作永久地下室墙结构-这在加利福尼亚州尚属首次。rn上下施工的好处，该项目采用的顺序以及设计出的创新结构和地基设计与施工方法有助于它的采用，在这里讨论。

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