RU2556777C2 - Hoisting gear for flyover erection - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to flyover erection hoisting gear in the form of bridge tower crane. The hoisting gear includes flyover span with footway cantilevers, railway carts with wickets, tower with rigid girder pivotally installed on front end of span where semicircular retainer is fixed. The tower is held by guys fixed by rear end of the span. Along the axis of the span, only two wrenches with system of pulleys are installed, the rigid girder is provided with blocks along its axis and at ends, and on the footway cantilevers four wrenches with ropes are installed.

EFFECT: possibility of device turnover is excluded during operation, and simultaneous erection of flyover flat bearing and span using this device is achieved.

2 dwg

Description

The invention relates to lifting devices for mounting flyovers.

Known lifting collapsible device contains a platform, support and running trolleys, a counterweight and a cantilever boom with support elements, including struts, racks and braces. There are tackles for hanging on a cantilever boom of a flat support or span of a flyover with their subsequent supply for installation [1].

The disadvantage of this lifting device for mounting the flyover is the presence of a cantilever boom with struts, which complicates and aggravates its design.

Known lifting collapsible device in the form of a pylon crane for mounting the span of the flyover, the latter playing the role of an arrow instead of a cantilever boom.

It contains the base part of the span and the pylon, which is a metal flat frame, pivotally supported by the lower end to the front end of the span and held by two guy wires for the rear end of the span. The span itself is supported by heavy-duty railway carts. Four tackles fixed at the top of a metal flat frame are designed to support the span to be installed with inclined tackles at its ends, while its rear end abuts against the end of the span of the base part [2].

The known lifting device for mounting flyovers in the form of a pylon crane has four chain hoists and four winches for lifting the two ends of the installed span due to the lack of a strong crossbar at the top of the pylon. When lowering and raising the installed span, the horizontal forces appearing at uneven tension of the chain hoists at the top of the pylon can easily overturn it. When installing a flyover bridge with inventory flat supports with crossbars and pivoting shoes, the crane crane can feed from the assembly site and install only spans on these inventory flat supports, which are somehow installed in a vertical position.

The technical result of the invention is the elimination of the likelihood of capsize crane pylon during operation and the simultaneous installation of a flat support and the span of the flyover.

To do this, the pylon is equipped with a strong and rigid crossbar, to which two blocks and two blocks at its ends are fixed along the axis of the base part of the crane.

In addition, in order to jointly supply the span and the flat inventory support when installing the flyover on the sidewalk consoles of the base structure, four winches with ropes were installed to support the ends of this flat inventory support under the span.

Figure 1 shows the crane pylon with installed span and flat inventory support of the flyover bridge. (The dotted line shows the span being installed and the flat inventory support with a shoe at the time of its support on the upper part of the support installed on the ground).

Figure 2 shows a General view of the pylon, pivotally mounted on the span, used as the base part of the crane pylon with installed electric winches.

The pylon crane includes the base part in the form of a flyover structure with sidewalk consoles 1, railway trolleys 2 with turnstiles 3, a pylon 4 with a crossbar 5, pivotally mounted on the front end of the base part 1. At the front end of the base part 1 there is a semicircular stop 6. On the span of the base part 1 is installed on its axis electric winch 7, which should drive the chain hoist 8, and the electric winch 9, which should drive the chain hoist 10. Electric winch 11 and 12 mounted on the sidewalk consoles span swarming of the base part 1, with its ropes 13 and 14, passed through the blocks 15 and 16, mounted on the crossbar 5, should raise and lower the lower ends of the racks of the flat inventory support 17. Winches 18 and 19 installed on the sidewalk consoles of the span of the base part 1 , with their ropes 20 and 21, through removable tap-off units 22 and 23, they must raise and lower the crossbar of the flat inventory support 17. Two guy wires 24 and 25, fixed to the rear end of the span of the base part 1, hold the pylon 4 in an inclined position. In addition, on the span of the base part 1 are located power plant 26 for electric winch drive and a counterweight 27.

Installation of a flat inventory support 17 and the span 28 in the design position on the axis of the flyover is as follows.

On the railway track of the assembly site in front of the mounted crane-pylon, the span structure of the overpass 28 with removable tap blocks 22 and 23 is installed, and a flat inventory support with a shoe 17 is laid in front of it.

The pylon crane is fed by a motor vehicle at a combined stroke 29 to the rear end of the span 28. The ends of this span 28 are slinged using the pulley belts 8 and 10. Then, with the pulley 10 driven by the electric winch 9, the rear end of the span 28 rises to abut its end in a semicircular emphasis 6. Polyspast 8, driven by an electric winch 7, raises the front end of the span 28 to achieve a horizontal position. A pylon crane with a span of 28 vehicles on a combined stroke 29 is fed forward until the front end of this span is located above the crossbar of the lying flat inventory support 17. The ropes 13 and 14 of the winches 11, 12 of the lower ends of the flat inventory support 17 are fastened and the ropes 20 and 21 winches 18 and 19 through removable blocks 22 and 23, securing its crossbar.

The resulting system: a pylon crane, an installed span 28 and a flat inventory support with a support shoe 17 are fed by the car on a combined 29 forward movement until the rear end of the installed span 28 is aligned in the vertical plane with the front end of the previously installed span.

The flat inventory support 17 is lowered by means of electric winches 11, 12, 18 and 19 to a vertical position until its shoe is supported on the ground. (This position is shown in dotted lines in FIG. 1). Then, using the electric winch 7 and the chain hoist 8, the front end of the span structure 28 is lowered while the ropes 20 and 21 are pulled at the same time. After supporting this end of the span structure 28 on the crossbar of the flat inventory support, the rear end of the span structure 9 and the pulley block 10 is lowered with sliding along the semicircular stop 6 until the support of the previously installed flat inventory support rests on the crossbar. The installation of the span 28 and the flat inventory support 17 at this end. Next, the chain hoists are unloaded and removed from the front end of the span structure of 28 removable tap blocks 21 and 22 with the latter being moved to the base part 1 of the pylon crane. Then, with the help of the car, on a combined stroke 29, the pylon crane is fed to the assembly site to prepare for the installation of the next span with a flat inventory support. If the flat inventory support is installed in the design position in any other way, then the crane crane installs only the span.

If the installation of an inventory railway overpass is carried out using a crane-pylon mounted from a span and the property of a flat inventory support of this overpass, then the economic effect is not in doubt, since the cost of creating a special installation crane is not required.

Information sources

1. SU. A.S. 1720994 A1 "Lifting device for mounting flyovers."

2. B.M. Weinblat, I.I. Elinson, G.N. Nikolaev, L.M. Tower “Cranes for the construction of bridges and transport hydraulic structures”, Moscow, 1966, pp. 162-163.

Claims (1)

A lifting device for mounting flyovers, including a base structure with sidewalk consoles on railway trolleys, a pylon with two racks and braces, pivotally mounted on the front end of the base structure, winches with chain hoists, characterized in that only two winches with chain hoists are installed along the axis of the base structure, the pylon is equipped with a rigid crossbar with blocks along the axis and at the ends, and four winches with ropes are installed on the sidewalk consoles.

Images