SU89830A1 - Crane for installation of bridge span structures - Google Patents

Description

Cranes for the installation of bridge spans with a frame mounted on a railway platform that has a boom are known. However, they have insufficient maneuverability.

In the proposed design of the crane, this disadvantage is eliminated by the fact that the frame of the crane is rotatable and equipped with a movable counterweight, and the boom is designed as a lifting crane.

FIG. Figures 1 and 2 schematically depict a crane in its working and transport positions; in fig. 3-crane in various working positions: I-ti span of the railway platform, II-turn the crane with a raised span. III lowering the boom of the crane for passage through the superstructure.

The crane is designed to mount spans along the top and consists of an arrow / (upper girder) to capture spans and lower girder 2, serving to fix the upper girder and balance the load to be lifted, for which the lower girder changes 1 allows you to balance the span. Each run consists of two metal main trusses. The distance between the axles of the upper girder is 900 mm and the lower girder 3000 mm. The upper girder (boom), carrying two mobile cargo units 4 at its end, is supported by means of side cantilevers 5 on the lower girder support cushions 6. to remove the span crane from the railway platform. The boom is lifted by two vertical spindles 8, driven by two worm gears 9. The bottom run transmits the entire vertical load, through the central heel and special frame 10 to two paired railway carts //. Rotation of the crane will pass through the route, through which the fixing screw passes.

In addition to the central heel, four support runners 12 are provided, supported by a steam rail 13. The crane can also be rotated on rollers in the cage around the anchoring vertical pin. The crane is rotated by two 15-minute-1 N1-stern and interacting with the plank lath. These two gears are driven in a second gear mode with the help of turning knobs 14 at four points in the central part of the crane. The raising and lowering of the superstructure is carried out by two manual winches / 5. The movement of the first; along the lower girder is carried out by a manual winch 16. At the same time, the same winch performs a horizontal change (one with the counterbalance) of the boom along the lower girder. With a non-shifting stretch, 1n the nrothnubese to the midpoint of the bottom1; during the run-through, the crane is hernted, moving into the transport half-slice, and in reverse motion — into the working one.

To ensure the stability of the crane along the cable during its movement, the rear horse of the npoion relies on the trolley / 7, which ToHiaH during the turn of the crane is pulled to the bottom purl with two screws with no MOHUi gear; gears i stick and / 8 and one. Kra in the traps 10g of the pack 1gold 1 1 and fits in the size of a.

When working, the crane should be located close to the base of the bridge and the ro. : The structures should be supplied to it on platforms. Filing a speck with an elevated span-m and i-tet bridge can be done by a steam locomotive.

Subject invention

Crane for bridge span structures including a sister; y, o tl 1 h ay P1, and with the fact that, with one piece of maneuverability of the crane and convenience nro - 315dst1; } io and made lifting.

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