Front end support traverse device and traverse method for variable span double support and large displacement for trestle

Abstract

The invention discloses a trestle bridge with a variable-span double-support large-displacement front-end support lateral movement device, which comprises a trestle main girder and basic columns with telescopic legs, each basic column has a horizontal section on the inner side, and two basic columns The horizontal section constitutes a sleeve structure, and a lateral movement hydraulic cylinder is respectively installed between each basic column and the middle fixed frame, and the two basic columns can move left and right under the drive of their corresponding lateral movement hydraulic cylinders; the main girder of each trestle bridge The front end of the trestle is equipped with telescopic legs, which are staggered forward and backward with the sleeve structure; a hoop assembly is provided under the front of each trestle main beam to be sleeved on the outer wall of the horizontal section of the basic column on the corresponding side. At the same time, the invention also discloses a trestle bridge with variable span double supports and large displacement front end support lateral movement method. On the premise of ensuring the reliable loading of the support and lateral movement device at the front end of the trestle, the one-time lateral movement can be realized, which can effectively shorten the number and time of lateral movement of the trestle bridge, thereby improving the efficiency of tunnel construction.

Description

technical field [0001] The invention relates to the technical field of tunnel construction trestles, in particular to a 24-meter construction trestle mainly used in tunnels (but not limited thereto), which has a double-action support structure with variable left and right support spans and is suitable for different excavation ground environments. The invention relates to a front-end support traversing device and a traversing method for the large-displacement traversing function of the main girder structure of the secondary trestle bridge. Background technique [0002] With the completion of the survey work of the Sichuan-Tibet line in my country and the construction of the project on the agenda, the construction of the tunnel project is facing increasingly complex geological conditions. In the tunnel construction project, the trestle bridge is one of the most critical equipment, it is located between the excavation surface and the concrete inverted arch pouring section, and ...

AI Technical Summary

Problems solved by technology

However, at present, the trestle bridges launched by various manufacturers in the country adopt a fixed frame structure for the front-end traversing frame, that is, the span of the columns on both sides of the front end of the trestle bridge is not variable; and the distance between the main girders on both sides of the trestle bridge is limited by the vehicle access time. The necessary width, and the overall width of the trestle is limited by the size of the tunnel section and the working range of the excavation equipment, resulting in the distance between the inner side of the front support column of the trestle and the outer side of the main girder not greater than 0.4 meters, that is, the overall structure of the main girder of a single trestle The traversing distance is less than 0.4 meters, and the traversing distance required by the trestle during construction is often more than 2 meters. During each traversing movement, the auxiliary support of the middle trolley is needed to traversing the front support frame, which results in Under the ideal condition of digging the ground level, the cycle period of a single traversing is as long as 0.5 hours, and the time required for traversing a distance of more than 2 meters is not less than 2.5 hours

Therefore, the support traverse frame of the fixed structure at the front end of the trestle has become the bottleneck condition that restricts the improvement of the work efficiency of the trestle bridge, and has become an influencing factor that restricts the progress of the tunnel construction.

Images