Masonry arch bridges have been utilized for thousands of years as roadway, river and stream crossings. They can be made up of worked or rough hewn stone, with or without mortar. The classic and organic look of a masonry arch bridge allows for the structure to blend in well with its natural surroundings. This paper will look into the rehabilitation and strengthening of two different types of masonry arch bridges. The Seatuck Creek Bridge carries the Montauk Branch of the Long Island Rail Road (LIRR) over a tidal creek in Eastport, New York. It was constructed in 1892. The structure, a single span masonry arch, has a clear span of 4.88 meters and a width of 10.97 meters. The load bearing element is a 610 mm thickness of common brick with a cyclopean concrete backing. The sandstone masonry abutments and wingwalls are founded on timber mats and 6.10 meter long timber piles. The backfill is shallow, less than 910 mm, and the bridge carries a single, non-electrified track. The available plans were illegible and there were no records of any repair work to the bridge. See Figure 1 for an elevation view of the structure.
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机译：砌体拱桥已被使用千年作为巷道，河流和溪流过境。它们可以由工作或粗糙的Hewn Stone组成，有或没有砂浆。砌体拱桥的经典和有机外观允许结构与其自然环境融合。本文将研究两种不同类型的砌体拱桥的康复和加强。 Seatauck Creek Bridge在纽约Eastport的潮汐小河上运载了长岛铁路（Lirr）的蒙托克分公司。它于1892年建造。该结构，单跨砌体拱门，距跨度为4.88米，宽度为10.97米。承重元件是610毫米厚度的公共砖，带有环形混凝土背衬。砂岩砌体基台和翼墙均设有木材垫和6.10米长的木材桩。回填浅，小于910毫米，桥梁带有单个非电气化的轨道。可用的计划是难以辨认的，没有任何修复工作的记录。有关结构的高度视图，请参见图1。
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