RU2326045C1 - Legged bridge construction gantry - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: legged bridge construction gantry consists of powered trucks interconnected with a transverse bridge and lift-and-transfer mechanisms (mounted on the trucks) consisting of a cross bar, support legs and walking legs and trucks moving along the cross bar skids. The walking legs are telescopic ones, with integrated hydraulic cylinders and resting on swivel joints, with swivel studs mounted on all the bridge pillars. The support legs are pivotally connected to the brackets of the powered trucks and are equipped with carrying hydraulic cylinders. The cross bar is pivotally suspended onto the legs to remain in the horizontal position.

EFFECT: enhancing the erection procedures efficiency.

2 cl, 2 dwg

Description

The invention relates to bridge cranes, in particular to walking building portals.

Known for such lifting vehicles as gantry cranes, crane-farms and other devices used in the construction of bridges of beam systems.

Known walking crane containing frames, self-propelled carts and telescopic hydraulic jacks associated with frames (SU 92818, 01/01/1951, B66C 19/00, analogue).

The disadvantage of using existing hoisting and transporting devices is the need for preliminary construction of various technological scaffolds and temporary supports for their operation, or the difficulty of moving heavy dimensional structures from the erected superstructure to the next.

The purpose of the invention is to develop the design of a lifting and transport device that allows you to erect beam bridges without the preliminary construction of scaffolds, other supporting structures, greatly facilitating the transition of the device from span to span, increasing the productivity of installation work in any water conditions.

This goal is achieved by developing the design of the walking bridge-building portal, which relies in the process of lifting and transporting work on bridge beams already installed by this portal and moving along the installed beams to the next span.

After approaching the span under construction, the portal takes a step through the span to lean with walking telescopic legs on the nearest bridge support.

Figure 1 schematically depicts a walking portal at the time of installation of the beam in the span of the bridge, and also shows the offset of the legs of the portal with the crossbar in its extreme rear position to capture the next beam.

Figure 2 schematically shows a portal without stepping legs, front view.

The walking bridge-building portal of the proposed design contains two massive self-propelled trolleys 1, blocked by a transverse bridge and mounted on the trolleys hoisting-and-transport mechanism, which includes a crossbar 2, mounted via four hinges 3 on two supporting legs 4 and on two stepping legs 5.

Step legs 5 are made telescopic with built-in hydraulic cylinders. The supporting legs 4 are supported on the brackets of the trolleys 1 by means of hinges 6, and the stepping legs 5, after completing the next step, are supported on the hinges 7, the trunnions of which are pre-installed on all the supports of the bridge under construction. The supporting legs 4 are able to change the tilt angles by means of a pair of load-bearing hydraulic cylinders 8, and the supporting and stepping legs are moved apart by a pair of stepping hydraulic cylinders 9 during the step.

A pair of hydraulic cylinders 10 holds the crossbar 2 in a horizontal position at all working angles of inclination of the legs of the portal. On the guides of the crossbar, which is a particularly rigid metal structure, two parallel freight carts 11 are installed, moving the load across the bridge. Carts can move both synchronously and separately.

All the articulated joints mentioned above operate strictly in a vertical plane parallel to the longitudinal axis of the bridge and do not allow deviations in other directions.

The walking portal works as follows.

On the approach, span beams are laid as technological guides, on which trolleys 1 are installed, and are connected together by a transverse bridge. On the trolleys, all the nodes of the lifting-and-transport mechanism are mounted, after which the legs 4 and 5 are transferred to the vertical, slightly deflected position by the supporting hydraulic cylinders 8 and with the coordinated participation of the other hydraulic cylinders of the portal, and the portal is moved to the shore support of the bridge along the beams laid on the approach.

Then the trolleys 1 are fixed on the beams with special locks, and the step legs 5 are transferred through the first span with the help of the hydraulic cylinders 8 and 9 and with the participation of the hydraulic cylinders built into the legs, are combined and secured to the axles of the second bridge support, forming articulated joints 7.

After completing the step and attaching the legs 5 to the pins, for convenience of mooring of the raised beam, the crossbar 2 on the legs 4 and 5 by means of all the hydraulic cylinders of the portal interacting according to the given program is transferred to the extreme rear position, the beam is moored, the portal moves backward to the first span structure, freight carts 11 shift the beam across the bridge to the installation site and installed on the first and second bridge supports.

The programmed interaction in the operation of all portal hydraulic cylinders will ensure structural rigidity at any moment of leg movement.

Having installed all the beams in the first span of the bridge, the portal takes the starting position, moves along the installed beams to the second span, steps through the second span, and the operation is repeated.

Having completed the installation of beams in all spans, a walking portal, moving in the opposite direction, can produce outfitting works.

When the bolt 2 is in the rearward position of the trolley 1 and the supporting legs 4 are at maximum load. But the center of gravity of this load is located inside the base of the bogies, excluding the overturning moment when the portal moves.

On the transverse bridge connecting the bogies 1, a conveyor can be installed, feeding the beams under the crossbar. A conveyor with beams laid on it can serve as a counterweight, which eliminates the need for fastening the trolleys 1 to the beams.

It is assumed that walking portals of the proposed design will find application in the construction of multi-span bridges in deep water with spans of up to thirty meters and a weight of structural elements of up to forty tons.

This portal can be used not only in the construction of bridges, but also when performing other work requiring steps through various obstacles.

Claims (2)

1. A walking bridge-building portal containing self-propelled trolleys connected by a transverse bridge, and a lifting-transport mechanism mounted on trolleys, including a crossbar, supporting and stepping legs, freight trolleys mounted on the crossbar guides, while the stepping legs are made telescopic with built-in them with hydraulic cylinders that take steps through the span of the bridge, and rely on hinges, the trunnions of which are mounted on all the bridge supports, and the support legs are pivotally connected to the brackets of self-propelled carts and soda holding hydraulic cylinders that carry out a change in the angle of inclination. 2. The walking bridge-building portal according to claim 1, characterized in that the crossbar is hinged on its legs to maintain its horizontal position by means of hydraulic cylinders in the process of performing a step or shifting the crossbar along the axis of the bridge.

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