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ENGINEERING THE MANSION'S HERITAGE

机译：工程大厦的遗产

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摘要

A development at 83 Queens Road in Melbourne, Australia, required construction of a three level basement. The normal geotechnical constraints of excavating adjacent to an existing relatively new building were challenging enough for the complicated soils profile occurring at the site. An additional significant challenge faced by the designers was the requirement to excavate underneath the entire footprint of an existing heritage listed building, known locally as "the Mansion", in the centre of the site. Maintaining the structural integrity of that building was afforded the highest priority during the 10 m excavation. This paper describes geotechnical aspects of the analysis, design and construction of the secant retention system adjacent to the new building and support of the Mansion enabling the 10 m excavation to proceed without causing damage to the structure. The secant wall comprised hard-soft interlocking piles constructed using CFA methods. CFA piles along the length of the Mansion provided short term support with the building load transferred to the piles by large steel beams jacked under the building. Survey results confirmed that movements of the retaining wall and also the load bearing piles were minimal and well within design expectations.
机译：澳大利亚墨尔本皇后大道（Queens Road）83号的一项开发需要建设一个三层地下室。对于在现场相对较复杂的土壤剖面而言，在现有的相对较新的建筑物附近进行挖掘的正常岩土工程限制已经足够具有挑战性。设计师面临的另一项重大挑战是，要求在场地中心的一处现有遗产名单中的建筑物的全部占地面积下进行挖掘，该建筑物在当地被称为“豪宅”。在开挖10 m的过程中，维护建筑物的结构完整性是最重要的。本文介绍了与新建筑物相邻的割线固定系统的分析，设计和施工的岩土方面，以及对豪宅的支撑，使开挖过程能够进行10 m，而不会造成结构损坏。割线壁包括使用CFA方法构造的软硬互锁桩。沿着大厦的长度的CFA桩为建筑物提供了短期支撑，并通过顶在建筑物下方的大型钢梁将建筑荷载转移到桩上。调查结果证实，挡土墙的移动以及承重桩的移动都是最小的，并且完全在设计预期之内。

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