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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：支撑波士顿历史悠久的地标：第一座基督教堂，科学家（TFCCS），原始母亲教堂（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：处理波士顿后湾的地下水位降低和随之而来的未经处理的木桩变质的后果并不少见。 1800年代末期和1900年代初，该地区的城市扩张是通过开垦土地，填满旧海湾的残余物而得以实现的。在这些情况下，未经处理的木桩通常被用作选择的基础。不幸的是，由于地下建筑，公用事业泄漏和地下室泄漏，城市建设还导致地下水位下降。母教堂（TMC）位于科学家的基督第一教堂（TFCCS）校园内，是波士顿市中心的历史地标，有数百个未经处理的木桩支撑，并且长期以来一直在实施移动和地下水监测系统，以识别任何有可能使木桩变质的区域。尤其是，调查表明原始母亲教堂（TOMC）的钟楼极有可能使木桩变质，测试坑调查证实了这一点。为了减轻将来的沉降并延长结构的使用寿命，我们设计并实施了基础支撑和修复方案，该方案包括两个阶段：使用钢针梁和预加载的微型桩对主塔进行支撑，以及剪裁和立柱。支持TOMC的其余区域。基础支撑的设计和建造必须适应高度拥挤和受限的出入区域，在荷载传递过程中保持未加固的砖石建筑结构的完整性，并结合针入穿过塔下木桩森林的微型桩，并提供一个具有最小未来结算和500年左右使用寿命的系统。该项目成功按计划完成，对合同计划的调整很少。后续运动监控调查显示，TOMC钟塔没有发生其他运动。

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