The order of the framework beam of the bridge formwork
The steps for setting the beam are the same as for the highway beam. In the setting sequence, one side is set up first, followed by the adjacent center beam, then the other side beam, and finally the center beam. If numbered in the order of 1, 2, 3, and 4, the order of the beams is 1, 2, 4, and 3.
The bridge machine feeds and lifts the beam
The prefabricated beam is transported to the rear of the bridge machine by a transporter, and is tied by the steel wire rope of the lifting beam. After the steel wire rope is tied to the prefabricated beam, the crane's hoist lifts the tied steel wire rope directly, achieving the purpose of lifting the prefabricated beam.
The bridge machine sets the center beam
When the bridge machine sets the dual-track bridge, all the support legs of the bridge machine are standing on the crossbeam, and the reactive force of the 1st support leg of the bridge machine is transmitted to the pier through the crossbeam, and the reactive force of the 2nd support leg is transmitted through the crossbeam and sleeper. To ensure that the T-beam of the bridge formwork is under good stress at the center, and that other legs have no stress.
The bridge machine sets the edge beam
When setting the center beam, the bridge machine can directly position the center beam through the lateral movement of the bridge machine. When setting the edge beam, the bridge machine needs to move laterally to the temporary stone cushion for the edge beam, and then use the bridge machine's single arm to lift the edge beam to move laterally into place.
According to the structural characteristics of the bridge machine, only the overall stability of the bridge machine when moving forward longitudinally is checked and calculated. According to the "Mechanical Engineering Handbook", the overall stability coefficient Kwi1 is 5. After the bridge machine completes the construction of a bridge, it is transferred using a transporter. The 1st, 2nd, and 3rd support legs are transferred using other equipment, and other components are transported by a transporter.
During the transfer, the front end of the bridge machine is supported by the 1st foot which is used to set the end span, and the rear end is supported by the 4th foot. Two transporters run to the designated positions respectively, and the space between the transporters and the main beam of the bridge machine is connected by the support leg cross beam (or the supporting beam), using the jack of the 0th and 4th support legs of the bridge machine, the main beam is placed on the transporter, and the transporter carries the bridge machine for inter-bridge transfer operation.
The use of highway bridge machines to set railway bridge formwork T-beams has been adopted in many railway projects in China with good results. It greatly solves the problem that the railway bridge machine cannot enter the site to set the beam, which affects the construction period of the railway.
Generally, four railway bridge formworks can be set per shift, which can basically meet the needs of on-site beam manufacturing and bridge construction progress.
In the process of setting the beam, it is not necessary to lay track bed and rails, which makes the working space of the bridge surface larger and facilitates the installation and construction of the wet joint and bridge surface system after the construction of the bridge formwork. It greatly improves the efficiency and progress of each sub-project after the beam is set.