A method for changing the span of a down-guiding girder type fixed-point hoisting bridge erecting machine

Abstract

The invention discloses a variable span method of a lower guiding beam type fixed-point suspension bridge erecting machine, which relates to the technical field of bridge erecting machines. The invention comprises the following steps: a middle leg is folded backward, a load-bearing beam trolley transports abox girder into the belly of the machine; a Guide beam rear leg shrinks, a guide beam movesforward in place; The front roller leg, the middle roller leg and the rear roller leg move forward and anchor move forward in turn and are anchored; Erection of a 24m box girder shall be completed bymoving the guide beam forward; Guide beam rear end and bridge deck are anchored; a 32 m box girder is lifted; The main girder is moved forward, the rear legs are folded backward, the girder truck carries the box girder in place, and the next box girder is erected. The invention is characterized in that the four legs of the guide beam are mutually matched, A longitudinal movement of the hole of thebeam guide machine is achieved, because a gantry frame of the beam guide machine is used for lifting legs, when the bridge and the tunnel are connected with the last span, a final span erection can be completed without an auxiliary crane, and the bridge abutment of the beam guide machine is adopted with the rear lifting position for lifting the beam, so that the distance between the tunnel entrance and the bridge abutment is minimized, and the mode that the guide beam leads out of the girder erection position is adopted, thereby reducing the operation time and improving the girder erection efficiency.

Description

Technical field [0001] The invention belongs to the technical field of bridge erecting machines, and in particular relates to a lower guide beam type fixed-point hoisting bridge erecting machine variable span method. Background technique [0002] Bridges composed of porous concrete simply supported beams often require unequal span arrangements. Therefore, the bridge erector must have the function of variable span beam erection. The existing variable span technology generally adopts the following methods: 1. Specially equip the front leg of the crane on the main beam of the bridge erecting machine to realize transposition installation; 2. Use another truck crane to lift the front leg under the bridge to realize the variable span action ; 3. Use the guide chain to pull manually. None of the above methods are ideal. Method 1 uses complicated equipment and increases the height of the bridge erector and the length of the main beam. Method 2 has poor applicability and is not suitable ...

AI Technical Summary

Problems solved by technology

None of the above methods is ideal. Method 1 uses complicated equipment and increases the height of the bridge erecting machine and the length of the main girder. Method 2 has poor applicability and is not suitable for working conditions such as rivers or deep valleys under the bridge. The security performance of method 3 is relatively poor, so the present invention provides a kind of efficient, safe span change method

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