FI58805C - BETONGSLIPERBLOCK TILL FLYTTBART KRANSPAOR - Google Patents

Description

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Wa [β] 11 ^ utlAggνιnosskrift 58805 C Patent granted 10 04 1931 (^ 5) Patent meddelat ^ v ^ (51) Kv.ik? /H*.ci.3 E 01 B 3/40 FINLAND —FINLAND (21) IWttlh * k * flw * -Ptt «fttti» Bknlnj 563/73 (22) HakwntapUvl - Anaeknlngtdtg 23.02.73 * * (23) Alkupllv »- · Gihlgh« t * d «| 23.02.73 (41) Tullut julklttfcsl - Bltvlt offuntllg 30.08.73

Patent State Board of Registration .... ...... ... ,, .....

_ '(44) Date of flag shield and month of issue. -

Patent · och regiltcrttyrelaen '' AmBIctn uttagd och utl.skrlfMn published 31.12.80 (32) (33) (31) * yy4 * «y utuolk · *» - Buglrd priorltet 29.02.72

Sweden-Sweden (SE) 2k99 / l2 (71) Swedish Rail System AB SRS, Sommarvägen 3, Box 1031, 171 21 Solna,

Sweden s i-Sverige (SE) (72) Ake Holmberg, Lund, Sweden-Sverige (SE) (7 * 0 Oy Kolster Ab (5k) Concrete sleeper for mobile crane tracks -Betongsliperblock account flyttbart krans pär

The size of construction cranes is constantly increasing, causing increased demands on the crane tracks to be built on construction sites where mobile cranes are used.

Swedish patent publication 339 551 describes a crane track and a method of constructing it, which has given rise to advantages mainly in the possibility of constructing track elements consisting of a rail and a number of connected concrete sleepers at the construction site, and in which the track elements can be connected in pairs. secondly, on transverse lines with adjustable power length.

When a load from a large crane has to be supported, the sleeper sections must be spaced at small intervals. When the distance between the sleeper pieces is far too large, both the rail and the track substructure are exposed to far too much stress. Overloading causes both permanent and inappropriate deformation or, in extreme cases, fracture.

When the track is built, for example, on a crushed stone base, a tool is used to compact the base, the so-called vibrating shovel. If the sleeper pieces are located far too close to each other, then there will be difficulties in using the tool, which will jeopardize the correct construction.

2 58805

It is an object of the present invention to provide a concrete sleeper body for mobile crane tracks in which this drawback is eliminated.

The concrete sleeper element of a mobile crane track element which achieves this goal has, in plan view, a polygonal or nearly elliptical shape with at least eight side edges, at least two of which are perpendicular to the track element and two of which are parallel to this track element, which is intended to be supported by a piece, with at least four side edges forming an acute angle with said rail element. The sleeper body is characterized in that each side edge forms a boundary line on one of at least eight vertical side surfaces, all of which are substantially the same height, this height being less than half the total height of the log, that both the top and bottom surfaces of the log are substantially flat and horizontal. less than half of the lower surface, and that there are a number of inclined boundary surfaces between the upper surface and the vertical side surfaces. .

In a practically preferred body, the lower surface comprises a central part which, by means of a step, is connected to a higher level part located in the region of the outer edges of the sleeper body.

A couple of embodiments of the invention will now be described with reference to the accompanying drawing.

Fig. 1 is a perspective view showing a part of a crane track element provided with a number of sleeper pieces according to the invention.

Figure 2 is a cross-sectional view of a modified embodiment of a sleeper body.

Fig. 3 is then a perspective view illustrating the general formation of a sleeper body of the type shown in Fig. 1 and the associated reinforcement and mounting plows.

The prefabricated crane track element 1 to be moved between different construction sites consists of a number of concrete sleeper pieces 2 connected to the rail 3. The track element is intended to be placed as a single 3,5805 assembly on a crushed base and two such parallel track elements are intended to be connected in pairs. length of track (not shown). When installing the track elements, a building crane running on previously set track sections can be utilized.

In the plan view, each concrete sleeper piece 2 is polygonal in shape and provided with eight side edges. The central part of the piece is thicker than its edge parts. At the bottom of the sleeper body shown in Figures 1 and 3 is a reinforcement which is substantially in a single horizontal plane. The piece also has four pieces of tie-down brackets 5, by means of which the rail 3 is fastened to the piece by means of wedge elements 6 which can be pushed into the straps.

Figure 2 illustrates a cross-section of a modified embodiment of a concrete sleeper according to the invention. The vertical section is thus taken perpendicular to the longitudinal direction of the rail 3 through the center of the part. As can be seen, the section taken in the body has top and bottom lines 2a and 2b, which are both horizontal. From the top line, the boundary lines 2e, 2f directed towards the side edge lines 2c and 2d of the body start, which are both oblique with respect to the horizontal. The top line 2a is shorter than the bottom line 2b. The baseline 2b goes in steps at the outer edge portions to the horizontal baseline portions 2g, 2h located at a higher level. The outermost vertical side edges 2c, 2d of the body will thus be located in a plane between the horizontal planes containing the top and bottom surfaces of the body.

In the plan view, the number of side edges of a polygonal concrete sleeper block may exceed eight. If the number of side edges becomes large enough, the shape of the body approaches the ellipse.

Claims (2)

11 58805 1. A 'concrete sleeper block (2) of a mobile crane track element (1) having, in plan view, a polygonal or nearly elliptical shape with at least eight side edges, at least two of which are perpendicular to the track element (1) and two of which are opposite to this track. in the direction of the element (1) intended to be supported by the sleeper body, at least four side edges forming an acute angle with said track element, characterized in that each side edge forms a boundary line on one of at least eight vertical side surfaces, all substantially equal in height, less than half the full height of the log, that both the upper and lower surfaces of the log are substantially flat and horizontal, with the upper surface being less than half the size of the lower surface, and that there are a number of inclined boundary surfaces between the upper surface and the vertical side surfaces. when the sleepers are located very close to each other, free spaces are formed between the external boundary surfaces of the sleepers, which make it possible for the tool to be inserted for machining the base of the sleepers. A concrete sleeper body according to claim 1, characterized in that the lower surface comprises a central part which is connected via a step to a higher level part located in the region of the outer edges of the sleeper body.