Abstract：Research purposes：In order to resolve the problem that the box girder is difficult to be transported and erected by the existing transportation & erection equipment in the bridge-tunnel immediately joint section on high-speed railway, this paper studies the design of bridge erecting machine with transporting and erecting and meeting the whole machine crossing tunnel, erecting box girder at tunnel entrance and erecting box girder inside tunnel.
Research conclusions：The scheme of the SLJ 900/32 mobile bridge erecting machine in this paper is as follows: (1) The main support leg adopts the joint-dominated triangular structure. The supporting wheel train 〖JP3〗mechanism is used on the main support leg. Without any anchor measures, the main support leg is designed to realize the structure self-〖JP〗stabilization and can resist overturning moment which bridge erecting machine over the span to the next pier. (2) With the constant drive mode on the main support leg, the bridge erecting machine realizes the synchronization control mode of different driving method and improves the safety and reliability in operation. (3)Through alternating functional transformation technique of the main support leg and auxiliary support leg, the bridge erecting machine can over the span to the next pier without the need of the guide beam. The operational process is simplified and the bridge erecting machine can erect box girder at tunnel entrance and erect box girder inside tunnel. (4) This application verifies that the main support leg with the automatic warning detecting device can achieve not only the real time and on-line monitoring internal force, but also the automatic warning even emergency stop protection when the internal force exceeded to ensure safety in operation. (5)This research results are available for transporting and erecting large-tonnage concrete box girder in normal working conditions and in the bridge-tunnel immediately joint section on high-speed railway.
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