於軌道下方施工是都市發展過程必然會遇到的課題，工程梁工法係使軌道在不中斷營運的條件下進行施工的一種施工方式，其概念是利用列車每日非營運時段，進行軌道拆除分階段施作工程梁所需之橋台、擋土設施及架梁等作業並於每日列車開始營運前回復軌道至可行駛狀況，工程梁即為供列車行駛的臨時鐵路橋梁。
雖說工程梁屬相當制式之構造物，但依其使用狀況又常條件變動，需再三重新檢核主梁設計強度，故本研究目標即是制定一符合規範又快速且不需依靠電腦軟體的工程梁簡易設計檢核的方法。
本研究係依工程梁特性汰除規範中不會影響或控制工程梁主梁設計之外力，並採K-18活載重及其衍生之作用力作為設計外力，再利用影響線法，將設計外力針對各種跨徑工程梁造之最大彎矩及剪力預先計算出來並列表，令後續工程梁設計者可快速查表即得所需參數，藉此大幅縮短設計檢核流程。

Construction under the track is an inevitable subject in the process of urban development. The temporary railway joists construction method is a construction method that enables the track to be constructed without interrupting the operation. The bridge abutments, earth retaining facilities and girder girders required for the construction of the temporary railway joists are constructed in stages, and the track is restored to a drivable condition before the train starts to operate every day. The temporary railway joists are the temporary railway bridges for trains to travel.
Although the temporary railway joists is a fairly standard structure, it often changes according to its use conditions, and the design strength of the main beam needs to be checked again and again. Therefore, the goal of this research is to develop a project that meets the specifications and is fast and does not need to rely on computer software. A method for simple design checking of beams.
In this study, according to the characteristics of the temporary railway joists, the external force that will not affect or control the design of the main beam of the temporary railway joists is eliminated, and the K-18 live load and its derived force are used as the design external force, and the influence line method is used to calculate the design external force. The maximum bending moment and shear force of various span temporary railway joists are pre-calculated and listed, so that the subsequent temporary railway joists designers can quickly check the table to obtain the required parameters, thereby greatly shortening the design inspection process.

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