Starting Base Structure of the Shield The launch frame is also called the shield launch base, which belongs to the auxiliary structure of the shield. When the shield starts to excavate, the shield launch frame is used as the support carrier of the shield machine to bear the weight of the shield machine. The shield launching frame is used in conjunction with the reaction frame. It is formed by splicing several groups of launching frame units with the same structure. Each group of launching frame units includes a base part, a supporting part, and a track platform part. The track platform part is symmetrically arranged at both ends of the base part and is connected to each other through the supporting part. The base part is connected as an integral structure, and the track platform part is composed of a pipe section sliding track platform and an annular top iron sliding track platform arranged in parallel to each other, and correspondingly arranged on the pipe section s…

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