DE2020238A1 - Method and device for erecting a crane - Google Patents

Description

Received on: .. 7 Q ^ T "

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Cologne, April 21, 1971 Hr 303

manure

of the Lord

Dipl.-Ing. Eduard Herbert, 675 Kaiserslautern, Dresdener Str .. '4

Method and device for erecting a crane

The invention relates to a method and apparatus for erecting a crane with one that can be extended from the outer mast Inner mast and one at the top of the inner mast articulated attached two-part collapsible boom and the design of the crane.

Construction cranes often have such a length of the boom that they consist of two parts assembled together. The subdivision The boom in two sections is necessary for a collapsible crane, in which the crane column is attached to a chassis and the boom is articulated with the counter-jib the column is attached and the erection takes place with the help of a rope, which on the one hand on the chassis and on the other hand is attached to the tip of the counter jib. In construction cranes of the type described above, it is also known to make the crane column

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To form an outer mast, in which an inner mast is arranged such that it can be telescoped out. One of two telescopically telescopic or pull-out parts of existing mast in connection with a two-part boom is also known. In the known embodiment, the two boom parts are for road transport with the mast lying horizontally on the top of the mast resting in such a way that the two parts run parallel to each other and at their both ends are hinged to the upper chords. As in the known training of the outer mast by a Cable pull in connection with a joint support is swiveled from the horizontal to the vertical position at the same time The boom consisting of the two sections is pivoted into the vertical axis, with the first boom section on the upper one Articulated at the end of the inner mast, later connected via a pull rope is raised into the working position with a counter jib. In the known version, if the two boom parts have received their vertical alignment at the same time as the outer mast, the second part of the boom around the axis, which with the upper chords connects their joints, initially pivoted to the side in a position in which the two boom parts with their triangular cross-section are one tip to tip have mirror symmetry. Since at the same time the upper chords of the two boom parts in the known version are connected to each other at the front, provided that the above-described mirror-image alignment of the two vertically directed boom parts is achieved, the joint

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The connection that connects the two upper chords is released. With the hoist rope, the second boom part is then pivoted around the articulation point on the abutting front edges of the boom parts "and lowered to the floor. This requires that the motor drive from the assembly drum that was initially used for the erection of the outer mast, solved and the drive on the Lifting drum must be switched. It's very cumbersome. After the second boom part in its horizontal position or a such angular position has been brought that the front boom tip rests on the ground, then the drive is again switched from the lifting drum to the assembly drum. Even this is again cumbersome. Another major disadvantage is that the frontal connection of the two adjacent upper chords of the two boom parts is point-shaped, so that it is exposed to great stress. If you are not very careful, Such bending moments or torsional forces occur after careful handling on this only point-like articulation on that this is often unusable due to deformation. Afterward is in the known training of the inner mast from the outer mast extended and thereby the first part of the boom moved up vertically, which then only has the front side on the upper chord attached second boom part with pulls up, so that with it the axial alignment of the two boom parts takes place with respect to one another. Then the two boom parts are through one attached to the front end of the first boom part and Pull rope guided by a counter-jib into the working position brought. '

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The present invention is based on the object, the disadvantages when erecting a crane as described above and to create a solution that has further advantageous properties Has. In particular, such articulated connections are to be created according to the aforementioned invention that these the acting Withstand forces even with small dimensions. Furthermore, a switch from the assembly drum to

t make the lifting drum unnecessary. To solve these tasks, a method for erecting a mast with an inner mast that can be extended from the outer mast and one at the upper end of the Inner mast articulated two-part collapsible boom proposed according to the invention that synchronously with the Extending the inner mast from the outer mast is attached to the inner mast and to the boom tip of the second boom part Rope released automatically and the second boom part around a located at the front end of the first boom part, the horizontal axis connecting the upper and lower chords

"Lowered and both boom parts brought into axial alignment will.

This solution according to the invention achieves that automatically with the extension of the inner mast from the outer mast, the second boom part is lowered, whereby the stress at the pivot connection between the first boom part and the second boom part is low, since at least two in one sufficient Articulation points located at a distance from one another are present or, in other words, the hinge axis at two at a sufficient distance points lying to each other is stored.

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According to the invention, a particularly simple device for carrying out the aforementioned method is characterized in that that at the upper end of the outer mast, a cantilever rope is attached is, which is diverted via a roller at the lower end of the inner mast to a roller at the upper end of the outer mast is and from there to the tip of the second boom part runs and is attached to this. .

Na _v ch a, further erf iridungs feature proper is suggested that known in a per se, triangular in cross-section boom which the: -beiden boom members interconnecting hinge axis between top chord and the running rail of the running cat forming Fahrgurt and at a small lateral distance from these is arranged. According to a further inventive feature, the joint axle has at least two bearings located at a distance. This is also to be understood as the fact that there are two tab connections with bolts located at a distance and thus the differential steering axle does not need to be a continuous axle.

The solution according to the invention makes it possible that the end face Adjacent travel belts of the two boom parts have a tenon connection, so that no special screw connection of the both boom parts is necessary at their front edges resting in the working position. The Travel belts of the second boom part with associated end faces Pins and the travel belts of the first boom part are provided with associated end-face bores.

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The invention is shown in the drawings using an exemplary embodiment explained in more detail. It is not limited to the form of training shown, but more are within the scope the invention lying modifications possible. Show it:

1 shows a construction crane according to the invention in the working position and in side view

FIG. 2 shows the construction crane according to FIG. 1 in FIG. 1, compared to a larger one Representation in the folded state for road transport in front view

3 essentially schematically shows the vertically erected one Outer mast with the two vertically directed boom parts

4 shows the arrangement according to FIG. 3 in a top view

5 shows the partially extended inner mast with partially lowered second boom part in a side view

6 shows the arrangement according to FIG. 5 in a top view

w Fig. 7 shows the fully extended inner mast with axially aligned two boom parts in a side view

8 shows the arrangement according to FIG. 7 in top view

Fig. 1 shows a construction crane in the working position. It consists of the chassis 10, which has two pairs of wheels 11 and 12, wherein these are the wheels for road transport and / or for the rails. The frame 10 carries the crane column in the form of the mast 13 »that of the lower outer mast 13a and that arranged in this and telescopically out of it

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extendable upper inner mast 13b consists. The mast will supported by two pairs of handlebars, i.e. one on each side upper link 14 and a lower link 15, ^ clie by bolts 16 and 17 attached to the chassis and 18 and 19 to the outer mast are.

On the chassis 10 there is also a winch 20 on which a rope 21 is rolled up, which is attached to the lower end 22 of the outer mast. At the upper end of the inner mast there is a joint 23 »through which the boom 24 is pivotably attached, which consists of two parts, namely the first boom part 24a and the second boom part 2 ¹ Ib. There is also a counter-jib 24c. The jib part 24 a and the counter jib 24 c are held by a pull rope 25. The tip of the counter jib 24c is connected to the chassis 10 by a rope 26 which is dimensioned in its length so that it is tensioned when the crane is erected into the working position.

Pig. 2 shows the construction crane in the folded up in a front view Condition for road transport, being essentially chemical the outer mast 13a and the inner mast 13b can be seen. The boom 24 rests on the top of the outer mast 13a, which consists of a component with the same triangular cross-section. The first one lies directly on the upper mast Section 24a on and on this the second section 24b, and by the fastening described below.

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The boom part 24a has the two travel belts 27 and 28. The extension to this form the travel belts 27a and 28a in the boom part 24b. The boom part 24a also has the top chord 29, the extension of which is the top chord 29a in the boom part 24b. At the connection point 30 of the first boom part and the second boom part shown in FIG 2, the hinge axis 31, shown in dash-dotted lines, which runs parallel to the legs connecting the two upper chords and running rails and at the same time at a small distance therefrom. It is thus arranged in the middle between the two legs, as shown in FIG. 2. The articulation is provided by two located at a sufficient distance fish joints 32 and 33. To this pivot axis of the boom section is thus folded around the axis 31, 24b, so that, as Fig. 2 shows the two Ausfegerteile parallel and mirror-ψ images of each other but with their Broad sides adjacent or facing each other, are aligned.

From the lying position, the outer mast, with the inner mast fully retracted, is aligned into the vertical position via the cable drum 20 and the cable, as shown in FIG. 1 and also in FIG. 3. According to FIG. 3, the inner mast is still completely in the outer mast as a lower mast. At the upper end of the outer mast there is a rope pulley 34, over which a rope 35 extending from the drum 20 is guided and which is attached to the lower end 36 of the inner mast. This solution can

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also through other solutions for extending the inner mast be moved to the outer mast. At the top of the outer mast the boom lowering rope 38 is attached at the point 37, the over a. Rope pulley 39 at the lower end of the inner mast is deflected back to a rope pulley 40 at the upper end of the outer mast and leads to the tip 41 of the second boom part, and is attached to it.

With the erection of the outer mast in the position shown in Fig. 3 ^; "also the two boom parts 24a and 2Mb are vertically aligned. The jib part 24a is, as described for Pig shown to 8 with a smaller cross section in the drawing, although both arm parts, as is apparent from Fig. 2, have an equal cross-section. Fig .. 3 also shows the ⁵ two LaschsiverbindungBBtucke 32 and 33 'that of the at Ausgangssteilung at a slight vertical distance to the upper edge The pivot axis 31 as a physical or imaginary axis lies in the horizontal plane and always remains in the horizontal plane even when the boom part 24b is lowered so that the forces acting on this axis remain low to the direction of travel 42 of the construction crane on the rails not shown in the drawing or in other words, as for F Fig. 2 described, parallel to the leg or between the two legs of the boom parts 24a and 24b.

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As soon as the inner mast 13b is extended out of the outer mast 13a, the rope 38 becomes shorter in the area of the inner mast and correspondingly longer in the area outside this mast, namely automatically by the extension of the inner mast from the outer mast. As a result, as can be seen from FIG. 5 with the illustration of an intermediate position, the front boom part 24b is lowered about the pivot axis 31 »which moves up with the raising of the inner mast ψ and the first boom part 24a attached to it, namely in a vertical plane which is at an angle of 45 ° to the direction of travel of the construction crane indicated by the direction of arrow 42.

Fig. 7 shows the inner mast moved completely out of the outer mast and the upper position of the boom part 24a at the same time with its still vertical orientation. In this position, the boom part 24b is lowered so far that it is with the boom ^ part 24a is in axial alignment. The rope 38 is then released from the tip 41 of the boom part 24b. Then it takes place the erection of the entire boom in its working position only in FIGS. 1 and 3 for the sake of simplicity counter-jib 24c shown in connection with the cable 26 shown in FIG. 1.

The inventive solution and arrangement of the pivot axis between the two boom parts 24a and 24b makes it possible to dispense with ^{a special fastening or locking between the two frontally abutting boom parts 2 1 Yes and 24b}

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Rather, it is possible to use only a tenon connection to be provided between the frontal abutting travel belts. For this purpose, the travel belts 27 and 28 of the boom part 24a with frontal holes and the travel belts 27a and 28a of the boom part 24b provided with frontal pins.

The solution according to the invention requires only a small amount of space for lowering the boom part 24b. This can continue to decrease by swiveling the construction crane around the bogie 41 according to FIG. 1 by 45 °. Then namely the boom part 24b lowered in the plane of the rail of the construction crane, the is free anyway. It is understandable that in reverse when folding the construction crane with the retraction of the inner mast into the outer mast of the boom part 24b via the rope 38, which is then coupled again at the tip of the boom part 24b is raised about the axis 31.

Fig. 9 and Fig. 9a show the articulated connection on the. both Boom parts 24a and 24b with the boom applied and FIGS. 10 and 10a with the boom extended. The top belt of the two Cantilever pieces are connected by a single or double strap which is attached at the level of belt 29 and 29a. These The tab is perpendicular to the axis 31. It is in the, both Upper chord ends 29 and 29a supported by bolts which are parallel to axis 31.

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When the boom tip is in the extended position (hanging from the mast) has reached and is brought from this vertical position on the mast into the horizontal operating position, the Upper chord 29, 29a always pull, the lower chords 27, 27a and 28, 28a always pressure. The 'train connection is ensured by the two tabs, the lower chords transfer the pressure Contact, the transverse forces are transferred through the pins on the travel belts 27 and 28. There is no additional derrinato Locking or bolting of the two boom sections required.

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Claims (7)

- 13 - ■ - -V ■ ,. : ■ -. ■■ Claims 1. Method for erecting a mast at one of the Outer mast, extendable inner mast and one at the top of the Inner masts fixed, two-part collapsible Boom, d ad u rc h e k en η ζ e i c h η et that synchronous with the extension of the inner mast from the "outer mast a rope attached to the inner mast and to the boom tip of the second boom part is released automatically and the second Boom part lowered around a horizontal axis located at the front end of the first boom part and lying in the plane of the top chord and a travel chord and both boom parts in axial alignment are brought. 2. Apparatus for carrying out the method according to claim 1, dadurchgeke η η ζ ei ch η et that at the upper end of the outer mast (13a) a boom lowering rope (38) is attached, which via a roller (39) ^{at the} lower end of the inner mast ( 13b) is deflected back to a roller (40) at the upper end of the outer mast and runs from there to the tip of the second boom part (24b) and is attached to it. 3. Apparatus for carrying out the method according to claim 1 and optionally claim 2, characterized · marked ζ ei c h η e t that in a known per se, in cross section triangular boom (24) which the two boom parts (24a, 2Mb) connecting joint axis (3D between the upper belt (29) and a ■. - 14 - 209 8 U / 0 4 26 - 11 »- the running rail of the trolley forming the travel belt (28) and arranged at a small lateral distance from this belt (28, 29) * is. 4. Apparatus according to claim 3 »characterized in that the hinge axis (31) two at a distance has located bearings (32, 33). 5. Device according to claims 2 to 4, characterized in that the end faces each other adjacent travel belts (27 * 27a and 28, 28a) of the two boom parts (24a, 24b) have tenon joints. 6. Apparatus according to claim 5, characterized in that the travel belts (27a, 28a) of the second boom part (24b) with assigned end-side pins and the travel belts (27 »28) of the first boom part (24a) with assigned frontal holes are provided. 7. Device according to claims 1 to 6, characterized in that the upper joint (32nd) in Height of the straps (29 »29a) is attached and consists of a single or double straps (50), each connected by a bolt the belts or attached extensions of the axis (31) is connected to the upper belt ends of the two boom parts. 2098U / 0A26