Variable-span double-support large-displacement front-end support transverse moving device and method for trestle

Abstract

The invention discloses a variable-span double-support large-displacement front end support transverse moving device for a trestle. The device comprises a trestle main beam and basic stand columns with telescopic legs, the inner side of each basic stand column is provided with a horizontal section, the horizontal sections of the two basic stand columns form a sleeve structure, a transverse movinghydraulic cylinder is installed between each basic stand column and a middle fixing frame, and the two basic stand columns can be driven by the corresponding transverse moving hydraulic cylinders to move left and right. The front end of each trestle girder is provided with a telescopic leg, and the telescopic legs and the sleeve structures are arranged in a front-back staggered mode. A hoop assembly is arranged below the front portion of each trestle girder and used for being arranged on the outer wall of the horizontal section of the basic stand column on the corresponding side in a sleevingmode. Meanwhile, the invention further discloses a variable-span double-support large-displacement front end support transverse moving method for the trestle. On the premise that reliable bearing of the trestle front end supporting transverse moving device is guaranteed, one-time transverse moving movement in place is achieved, the trestle transverse moving frequency and the trestle transverse moving time are effectively shortened, and therefore the tunnel construction efficiency is improved.

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.

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