Railway Construction Machine 300ton Segment Launching Gantry

Introduction to prefabricated segment assembly method

      Prefabricated segmental assembly methods have been in foreign countries for decades, but the introduction of domestic use is still very short. A brief overview of this method is to divide the whole hole beam into small segments that are convenient for long-distance transportation (usually about 2.5m). After the prefabrication field is prefabricated, it is pulled to the frame beam site, and the special segment assembly bridge machine is assembled piece by piece. Holes, construction by hole until the end. .

      Segment assembly method is divided into dry assembly and wet connection according to different joint treatment methods. The dry assembling method is that the beam segment is accurately prefabricated according to the line shape and slope of the bridge in the prefabrication field. When the field is erected, the epoxy resin is applied between the segments, and all the segments are bonded together. overall. The wet joint assembly differs in that there is a width of about 50cm between the segments. After all the segments are in place, the joints are poured, and the strength of the bridge to be casted can reach the requirements before moving forward. Set up the next hole. Since it is necessary to wait for the strength of the concrete to meet the requirements, the construction time of each hole in the wet joint method is generally about 10 days, and the assembly of the thousand methods is much faster, generally 3 to 4 days/hole.

The choice of the beam-feeding method is critical to the construction of the entire project. There are basically two ways of feeding the beam: the lower beam under the bridge and the rear feeding beam on the bridge.

       Adopting the beam feeding scheme under the bridge: Due to the particularity of the components, the standard for the beam access road is relatively high. In the early stage of construction, the construction access road should be constructed consciously to avoid waste caused by two or more constructions.

       Adopting the rear beam feeding method on the bridge: It is necessary to determine the setting position and number of the lifting beam points according to the size of the engineering quantity and the construction period. The setting of the lifting beam point is directly related to the construction of the temporary storage beam site and the construction of some transportation beam access roads. In general, the speed of the beam on the bridge is slow, and the equipment required for the beam setting is very demanding.

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