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首页> 外文会议>Geotechnical frontiers >Underpinning a Boston Landmark for the Ages: The First Church of Christ,Scientist (TFCCS), the Original Mother Church (TOMC), Foundation Repairs
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Underpinning a Boston Landmark for the Ages: The First Church of Christ,Scientist (TFCCS), the Original Mother Church (TOMC), Foundation Repairs

机译：为年龄段的波士顿地标：基督第一个教会，科学家（TFCC），原母教堂（TOMC），基金会维修

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Dealing with the consequences of lowered groundwater levels and consequent untreated timber pile deterioration in Boston's Back Bay is not uncommon. Urban sprawl in this area in the late 1800s and early 1900s was made possible through land reclamation, filling in the remnants of the old bay. Untreated timber piles were often used as the foundation of choice in these conditions. Unfortunately, urban construction also resulted in decreased groundwater levels as a result of underground construction, leaking utilities, and leaking basements. The Mother Church (TMC), located on The First Church of Christ, Scientist (TFCCS) campus, is a historic landmark in downtown Boston supported on hundreds of untreated timber piles, and has long been implementing a system of movement and groundwater monitoring to identify any areas at risk of timber pile deterioration. In particular, the surveys indicated that the bell tower of The Original Mother Church (TOMC) was at a high risk of having deteriorated timber piles, and test pit investigations confirmed this. To mitigate future settlements, and extend the service life of the structure, we designed and implemented a foundation underpinning and repair scheme consisting of two phases: underpinning of the main tower with steel needle beams and pre-loaded micropiles, and cut-and-post underpinning in the remaining areas of the TOMC. The design and construction of the foundation underpinning had to accommodate for highly congested and restricted access areas, maintain the integrity of the unreinforced masonry tower structure during the load transfer process, incorporate micropiles needled through the forest of timber piles below the tower, and provide for a system with minimal future settlement and a service life in the order of 500 years. The project was completed successfully and on schedule, with minimal adjustments to the contract plan. Follow up movement monitoring surveys shows no additional movement of the TOMC bell tower has occurred.
机译：处理降低地下水位和随后波士顿后湾的未经处理的木材桩变差的后果并不罕见。在18世纪后期和19世纪初的城市蔓延，通过陆地填海，填补了旧湾的残余物。未经治疗的木材桩通常被用作这些条件下选择的基础。不幸的是，城市建筑也导致地下水平降低，由于地下建设，泄漏公用事业和地下室泄漏。母亲教堂（TMC），位于基督教教堂，科学家（TFCCS）校园，是波士顿市中心的历史标志，支持数百个未经处理的木材桩，并长期以来一直在实施一个运动和地下水监测来识别任何面临木材桩劣化风险的地区。特别是，调查表明，原来母亲教堂（TOMC）的钟楼处于劣化木材桩的风险，并且测试坑调查证实了这一点。为了减轻未来的定居点，并扩展结构的使用寿命，我们设计和实施了由两阶段组成的基础支撑和修理方案：主塔与钢针梁和预加载微量微量的底线，以及切割和柱子在TOMC的剩余区域内支撑。基础支撑的设计和构造必须适应高度拥挤和限制的接入区域，在负载转移过程中保持未原始的砌体塔结构的完整性，通过塔下方的木材桩森林加入微量净化物，并提供未来结算和500年的服务生活的系统。该项目已成功完成，按计划进行，对合同计划进行最低调整。跟进运动监控调查显示，没有发生巨大的钟塔的额外运动。

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