DE102012102466A1 - Lifting device for use in lifting system for heavy items in construction industry, has support plate with lower side and upper side, where lower side is configured as bearing surface - Google Patents

Abstract

The lifting device has a support plate (11) with a lower side and an upper side (15), where the lower side is configured as bearing surface (13). A multi-limbed handle (19) is fixed with its legs (21,23) on the upper side of the support plate. A borehole (25,27) is fed-through the support plate for receiving a bolt or anchor rod. An independent claim is also included for a system with an anchor.

Description

TECHNICAL FIELD OF THE INVENTION

The invention relates to a lift-off device, and a system comprising such a lift-off device for lifting heavy elements. In particular, in the construction industry, it is often necessary to dismantle or cut out heavy components, especially parts of large structures and then lift them.

STATE OF THE ART

The usually used to date for lifting loads in construction tend to bend and / or break. Often, the forces that occur can not be optimally directed to the anchor structure, so that it fails by bending or breaking. In addition, bent anchors are not reusable and must be replaced.

In addition, the assembly technique is cumbersome. Especially for heavy loads a one-sided attachment of a lifting device is not enough. Rather, the anchor must be performed by the element to be lifted so that it can be fixed on both sides. For this purpose, then usually several, d. H. at least two, workers necessary, which may need to be equipped with a radio, if it is the work to be performed, for example, the cutting and lifting a ceiling tile.

OBJECT OF THE INVENTION

It is therefore an object to provide an improved lifting device for lifting loads available, which does not have the disadvantages of the prior art, or at least partially avoids.

In particular, it is an object of the present invention to improve the mounting conditions of lifting devices on heavy, bulky and / or very thick elements (in particular components). In addition, the safety of the staff, which applies lifting equipment should be increased. Furthermore, it is task to prevent tearing, bending or breaking a lifting anchorage. In particular, the bending of anchors should be prevented, so that they can be easily removed after use and optionally reused. Improvements should also be effective when lifting loads, which are pulled out laterally under diagonal pull, to be lifted afterwards or at the same time. It is also to improve the lifting of loads that rotate during the lifting operation, in particular, which rotate about an axis other than the vertical, as often occurs as a result of diagonal pull.

DESCRIPTION OF THE INVENTION

This object is achieved with a lift-off device according to the first claim and a system which includes said lift-off device.

Accordingly, a first aspect of the invention relates to a lifting device, in particular for lifting loads such. As components or parts of components, including a support plate having a bottom and a top, wherein the underside is designed as a support surface, a multi-legged handle, which is fastened with its legs on top of the support plate, and at least one passing through the support plate borehole for receiving a bolt, in particular a threaded bolt, or armature, in particular an anchor rod. The device according to the invention serves for frictional anchoring on a component. The anchored lifting device provides a load engagement for lifting the component. The use of a platen allows optimum force distribution of the load forces on the entire surface of the platen support on the device. It follows that bending of anchor and / or bolt can be prevented by diagonal pull. Advantageously, said lifting device can be mounted from one side by z. B. an anchor rod with cutting thread and connecting thread is used.

The inventive lift-off device is designed to safely lift at least up to 2.5 tons. For this purpose, advantageously a platen with a diameter in the range of about 20 cm to 50 cm and a thickness (i.e., thickness) in the range of about 1 cm to 3 cm is used. The handle expediently has approximately the same thickness as the support plate; however, it can also be made stronger. The lift-off device preferably consists essentially of a metal, in particular of steel.

Conveniently, the handle is two-legged. The handle thus includes two legs and is advantageously designed U-shaped. This construction facilitates the attachment of a crane hook. Also, this design allows the lifting of a component from an inclined or vertical position, because the U-shaped handle allows pivoting about 180 ° about a horizontal axis and in relation to a stretched crane rope, while the handle hangs on a crane hook. Optionally, the legs are inclined with and to the Henkelenden out widening leg wings fitted, which act as reinforcing struts.

Preferably, the at least one borehole is arranged normal to the support surface. Anchor rod and / or bolts can thereby be mounted vertically in the component. This allows an optimal distribution of force on support plate and component.

In one embodiment of the lifting device, the at least one borehole consists of only a single borehole, which is arranged substantially centrally of the handle, in particular which is arranged substantially coaxially on the axis of symmetry of the handle.

In another embodiment of the lifting device, the at least one borehole includes a borehole which is arranged substantially centrally of the handle, in particular which is arranged on the axis of symmetry of the handle. Additionally or alternatively, wellbores may be disposed peripherally to the central wellbore. Depending on the load thus one or more bolts and / or anchor rods can be used to ensure optimum power transmission.

The lift-off device is preferably characterized in that a first support plate area around the borehole, which is arranged centrally to the handle, has an increased thickness in comparison to peripheral support plate areas. The support plate is thus in the area of increased stress, d. H. in the plate interior, thicker reinforced.

Preferably has the wellbore, which is arranged centrally to the handle, in particular which is arranged on the axis of symmetry of the handle, an internal thread for screwing with a bolt or anchor rod. For this purpose, the bolt or anchor rod includes a load application means in the form of a connection thread. Instead of or in addition to said internal thread, a nut may be used to anchor anchor rod or bolt with the lift-off device on a component.

The connecting thread is advantageously, in particular in concrete or shuttering, a coarse thread (such as the DYWIDAG coarse thread). The coarse thread is advantageously designed as a self-cleaning thread. In particular, as an armature rolled rods are used, which are provided with a self-cleaning thread. Thread core diameters of 15 mm with a thread outer diameter of about 17 mm and a pitch of 10 mm are advantageously used here.

Advantageously, a plurality of boreholes are arranged peripherally around the axis of symmetry of the handle, in particular four boreholes. Advantageously, the plurality of boreholes are circumferentially uniformly distributed around the axis of symmetry of the handle. If there are several drill holes, several bolts and / or anchor rods can be used for anchoring. This can have a favorable effect on very heavy and / or breakage-prone elements.

Advantageously, the lifting device consists of at least two components welded together, wherein the support plate forms a first component and the handle forms a second component. Such a construction is relatively easy and inexpensive to manufacture.

Conveniently, the lift-off device has a reinforcing plate, which has smaller width dimensions than the support plate, forms a third component, which is arranged centrally below the handle and / or within the handle leg.

Preferably, the support surface is circular. Thus, the support plate is preferably cylindrical. In addition, the reinforcing plate may be cylindrical.

Alternatively, square, rectangular, oval or otherwise shaped bearing surfaces or support plates are possible.

In general, the support plate is preferably formed as a flat vertical circular cylinder. The circular cylinder is in this case 0.5 cm to 5 cm, preferably 1 cm to 3 cm high and has a diameter of 15 cm to 70 cm, preferably 20 cm to 50 cm. The reinforcing plate is advantageously also designed as a vertical circular cylinder with a diameter of 5 cm to 40 cm, preferably 7 cm to 20 cm. The reinforcement plate has approximately the same thickness (or cylinder height) as the support plate. Both plates are advantageously welded together.

Conveniently, the support plate on its underside a flat (plane) support surface. Alternatively, the support surface may also be curved if the component to be lifted has a curved surface. The support plate can therefore be adapted to the device to be lifted.

A second aspect of the invention relates to a system including a lift-off device as indicated above and at least one bolt or tie rod received by the at least one drill hole of the lift-off device. The Mounting such a system is quite simple and has the advantage that it can be mounted (if desired) from one side of the component. A complete piercing of the device to be lifted is not necessary. Rather, it is possible to make the assembly of the lifting device from only one side.

Preferably, the bolt or anchor rod is selected from the group of thread-cutting anchor (in particular a concrete anchor) for self-locking anchoring in surfaces such as concrete, stone, masonry or the like, or in objects made of concrete, stone, masonry or the like. In particular, the lifting device according to the invention is designed in such a way that anchor rods are used, which are usually used in concrete or formwork construction.

Advantageously, the thread-cutting anchor includes a substantially cylindrical shank, which forms a front shank portion with a first core diameter and a rear shank portion with a second core diameter with respect to a setting direction, wherein the front shank portion comprises a helically encircling cutting thread and the rear shank portion opposite Setting direction extending attachment portion comprises, which rearward shaft portion has a load application means and optionally a engagement means for transmitting torque to the shaft.

The helically encircling cutting thread preferably has thread flanks which enclose an acute angle with each other. This improves the cutting into the component material, the bracing and anchoring in this and ultimately also the maximum possible weight that can be lifted with the lifting device.

The shaft expediently has a stepped core diameter, wherein the first core diameter is smaller than the second core diameter. The use of such a shaft leads to a stable anchoring and jamming of the shaft in the component.

If an anchor rod, which comprises load application means (possibly with connecting thread), used in conjunction with the lifting device, then the lifting device can be anchored from a component side. This has the advantage that a worker alone can attach the lifting device.

In the following, the invention will be described in more detail in a schematic representation with reference to the figures. Show it:

1 : schematic representations of a lifting device according to the invention, in a) a first side view, b) a second, with respect to the first side view rotated by 90 degrees side view and c) a plan view;

2 a schematic 3-D view of a lifting device according to the invention; and

3 FIG. 3 is a schematic 3-D view of an exemplary armature similar to the prior art (FIG. WO 2007/012417 ) is known.

DETAILED DESCRIPTION OF THE INVENTION

In the 1a . 1b . 1c and 2 is a lifting device according to the invention 9 disclosed. The same reference numbers in different figures indicate the same components or structures.

The lifting device according to the invention 9 includes a platen 11 with a handle 19 , The platen 11 consists of a bottom 13 and a top 15 , The platen 11 is preferably cylindrical. The top 15 behaves to the bottom 13 like a back to the front. The bottom 13 is advantageously flat (ie flat), whereby it can be placed flat on a component, such as a concrete slab. The bottom 13 thus serves as a support surface. The handle 19 is as a single hole with two legs 21 . 23 U-shaped. The thigh ( 21 / 23 ) can advantageously form sweeping wings, which form the support plate ( 11 ) expand. The thigh 21 . 23 are rigid with the top 15 the platen 11 connected, in particular preferably welded on the plate. The handle 19 is thus on the leg ends on the top 15 the platen 11 applied. The handle 19 is preferably perpendicular to the platen 11 arranged. Furthermore, the handle is advantageously placed symmetrically on the support plate, such. B. on a diagonal, ie along a line which through the axis of symmetry 24 the preferably cylindrical support plate 11 runs. In the example shown 1a -C includes the lift-off device 9 , which at least from platen 11 and Henkel 19 consists essentially of two symmetry planes positioned at right angles to each other as well as an axis of symmetry 24 , which is defined by the intersection of the two planes of symmetry. One or more through holes 25 . 27 pass the platen 11 from the support surface 13 to Opposite side, ie to the top 15 the platen 11 , These through holes 25 . 27 preferably lead perpendicular to the support surface 13 , The lift-off device 9 can with a central borehole 25 in the platen 11 be executed, which advantageously centered between the legs 25 . 27 of the handle 19 is arranged. Alternatively or additionally, a plurality of boreholes may be peripherally around the mid-point between the leg ends (preferably around the axis of symmetry 24 the lift-off device 9 ) can be arranged. Advantageously, such peripheral boreholes 27 arranged distributed so that when anchoring the lifting device 9 a homogeneous distribution of force in the lifting device 9 and an item to be lifted (not shown). For example, four peripheral drilled holes 27 , as in 1c shown to be distributed on a circular line with center between the leg ends of the handle distributed at angular intervals of about 90 °. Optionally, to reinforce the lifting device 9 the platen 11 on their top 15 in the middle with a reinforcing plate 35 be occupied, with the reinforcing plate 35 also preferably by welding with the support plate 11 firmly connected. The holes 25 . 27 , especially the central borehole 25 , are by platen 11 and reinforcing plate 35 guided. The reinforcement plate 35 covered, or reinforced the support plate 11 at least in a first central panel area 31 between the leg ends of the handle 19 , The reinforcement plate 35 is preferably also cylindrical.

The lifting device according to the invention 9 is intended to serve as load-bearing means for holding, lifting and transporting heavy loads, in particular heavy components (which are not shown here). In particular, the lift-off device can serve for holding and subsequently lifting and transporting away components to be dismantled, or parts of components. To prepare such a device is the lifting device 9 with its support surface 13 placed on the device and fastened or anchored. The one or more through holes 25 . 27 in the platen 11 serve here for fastening the support plate 11 on the device. Anchor bolts or screws, which are anchored in the component, fix the lifting device 9 over the existing holes 25 . 27 and, if appropriate, corresponding mother.

For lifting the above-mentioned anchor according to the specific requirements and in particular due to the weight and the material of the load to be lifted from conventional anchors, in particular anchor bolts and anchor bolts selected. Should the lifting device 9 (also) over the central borehole 25 , which can be under the tab, be attached, at least the length of the anchoring protruding anchor to control, so between anchor and handle strap 19 enough space to hang a crane hook remains. Depending on the load, a system with one or more anchors can be used, with the anchors through corresponding holes 25 . 27 with the lifting device 9 get connected.

The lift-off device can be anchored in various ways to a component to be lifted. One possible way is to perform one or more anchors through the component and the holes of the lifting device and from both sides, ie the lifting device facing away from the side of the device and equipped with the lifting device page to fix, z. B. with wedges or preferably threaded nuts. For this type of anchoring z. For example, a bolt with terminal load engagement means may be used at each bolt end. If only a single anchor rod is used, it is conceivable that the lifting device 9 itself serves as a threaded nut, as far as borehole 25 designed with a matching internal thread.

In another preferred type of anchoring, an anchor, which at one end a load application means and at the other an anchor means, for. B. in the form of a cutting thread, used. In order to attach one or more such anchors, it is not necessary to pierce the device completely. It is sufficient to anchor the anchor from a component side and bring the lifting device 9 to secure it at the anchor. This approach has the advantage that the lifting device 9 can be anchored from only one component side. This in turn has the advantage that a worker alone can attach the lifting device.

Regardless of the type of anchorage, the support plate should 11 resting on the component, so that the power transmission from the support plate 11 over the entire surface can be transferred to the device.

The fixing device fixed on the component and according to the invention 9 is preferably using a lifting hook, z. B. a crane hook, which in the handle strap 19 is used. The elements to be removed are, for example, heavy concrete elements which z. B. only after attaching a lifting device 9 from a larger structure, such. B. a concrete floor, are cut out. Also wood and steel elements are advantageously lifted with the lifting device according to the invention.

The invention will be explained with reference to exemplary attachment variants.

• – Mittige Verankerung mit gewindeschneidendem Betonanker, bevorzugt mit einem Lastangriffsmittel mit DW15 Gewinde,
• – mittige Verankerung mit einem Schalungsanker, bevorzugt mit einem Lastangriffsmittel mit DW15 Gewinde,
• – periphere Verankerung mit mehreren Schwerlastankern, z. B. zwei oder weiter bevorzugt vier Schwerlastanker für zwei diagonal einander gegenüber oder vier auf die vier Eckpunkte eines Quadrats positionierte Bohrlöcher,
• – periphere Verankerung mit mehreren Schalungsankern, z. B. zwei oder weiter bevorzugt vier Schalungsanker (z. B. mit DW15 Gewinde) für zwei diagonal einander gegenüber oder vier auf die vier Eckpunkte eines Quadrats positionierte Bohrlöcher,
• – periphere Verankerung mit mehreren gewindeschneidenden Betonankern, z. B. zwei oder weiter bevorzugt vier Betonanker für zwei diagonal einander gegenüber oder vier auf die vier Eckpunkte eines Quadrats positionierte Bohrlöcher,
• – Kombination einer der aufgezeigten mittigen Verankerungen (i. e. entweder des mittigen gewindeschneidendem Betonankers oder des mittigen Schalungsanker) mit mehreren Schwerlastankern in den peripheren Bohrlöchern,
• – Kombination einer der aufgezeigten mittigen Verankerungen mit mehreren Schalungsankern in den peripheren Bohrlöchern, und
• – Kombination einer der aufgezeigten mittigen Verankerungen mit mehreren gewindeschneidenden Betonankern in den peripheren Bohrlöchern.

Preferred mounting variants are the following:

• - Central anchorage with thread-cutting concrete anchor, preferably with a load application with DW15 thread,
• - central anchoring with a formwork anchor, preferably with a load application with DW15 thread,
• - peripheral anchoring with several heavy duty anchors, z. B. two or more preferably four heavy duty anchors for two diagonally opposite each other or four holes positioned on the four corner points of a square,
• - peripheral anchoring with several formwork anchors, z. B. two or more preferably four formwork anchors (eg with DW15 thread) for two boreholes diagonally opposite one another or four boreholes positioned on the four corner points of a square,
• - peripheral anchoring with several thread-cutting concrete anchors, z. B. two or more preferably four concrete anchors for two diagonally opposite each other or four holes positioned on the four corner points of a square holes,
• Combination of one of the indicated central anchorages (ie either the central thread-cutting concrete anchor or the central formwork anchor) with several heavy duty anchors in the peripheral boreholes,
• - Combination of one of the identified central anchorages with several formwork anchors in the peripheral boreholes, and
• - Combination of one of the identified central anchorages with several thread-cutting concrete anchors in the peripheral boreholes.

The anchors mentioned here, d. H. the thread-cutting concrete anchor, the formwork anchor and the heavy-duty anchor are described further below.

Said formwork anchor is a commercial anchor normally used to fix building formwork. A formwork anchor is usually provided with a continuous thread. The preferred formwork anchor preferably has a load application with DW15 thread (DYWIDAG thread) or a compatible thread, as z. B. of BETOMAX ^{® is} produced. A load bearing means, which has a thread measure of DW15, generally has a shank core diameter of 15 mm. Alternatively, formwork anchors with a 20 mm or 26.5 mm shank core diameter are commonly used. For anchoring with a formwork anchor the formwork anchor is conveniently in a through hole in the device z. B. fastened by means of nut and locknut.

The above-mentioned heavy duty anchors are commercially available anchors, which preferably also have a load application with DW15 thread. A heavy duty anchor is usually designed as expansion dowel. The expansion anchor can be set from one side and possibly released again. In contrast to the use of formwork anchors, when using heavy duty anchors, a non-penetrating wellbore is sufficient and the anchoring work can be done on one side of the component and thus by a worker alone.

The above-mentioned thread-cutting concrete anchor is in 3 shown schematically. It is similar to the one in the international application WO 2007/012417 has been disclosed, and has corresponding advantages. According to the 3 indicates the thread-cutting concrete anchor 41 a cylindrical shaft, with respect to its setting direction S a front shaft portion 43 and a rearward shaft portion 45 includes. The front shaft portion is formed as a cutting portion and with a helically rotating cutting thread 46 fitted. The turns of the cutting thread 46 project beyond the core diameter of the corresponding front shaft section 43 , The cutting thread 46 extends substantially throughout the entire length of the front shaft portion 43 and is advantageous knife-like sharp-edged. In particular, the cutting thread 46 Thread flanks on which enclose an acute angle with each other. The Wetzrichtungsseitige front end of the shaft ends in a plug-in section 47 , which is truncated cone-shaped and unthreaded. Between the turns of the cutting thread 46 Optionally runs a thread-like profiling 48 which has a smaller projection over the core diameter of the front shaft portion 43 has as the cutting thread 46 , The slope of the thread-like profiling 48 corresponds to the pitch of the cutting thread 46 , The front shaft section 43 is through an intermediate section 49 from the rearward shaft section 45 separated. The intermediate section 49 forms a transition from the cutting thread 46 to the connection thread 51 and advantageously has one at the front shaft portion 43 adjacent, bulging extended area 52 for stabilization of the set concrete anchor 41 , The rearward shaft section 45 is with a load attack 51 designed for attachment of a lifting device. The load application 51 is exemplified as a thread-like profiling and can be a coarse thread, such as a roller screw or a spindle thread, a metric thread, a Whitworth thread or a fine thread. One over the turns of load application 51 measured connection diameter in the rear shaft section 45 is about the same size or only slightly larger than that on the cutting 46 measured outside diameter of the front shaft section 43 , For example, with a connection diameter of 17 mm is the over the cutting edges 46 measured outside diameter, for example, about 16.5 mm. The core diameter of the rearward shaft portion 45 is about 15 mm, and the core diameter of the front shaft portion is about 11.7 mm. The thread-cutting concrete anchor 41 preferably has at least one DW15 thread on the load engagement means 51 on. To the rear shaft section 45 is an optional approach 53 trained, the z. B. is provided with an external hexagon. The approach 53 used to attack a tool, such. B. a rotary drill, for torque transmission to the concrete anchor 1 during the setting process.

LIST OF REFERENCE NUMBERS

9

lifting

11

platen

13

Bottom of the platen, or support surface

15

Top of the platen

19

Henkel, in particular designed as a one-hole lug

21

First leg

23

Second thigh

24

axis of symmetry

25

Middle hole

27

Peripheral borehole

31

First platen area

33

Second platen area

35

reinforcing plate

41

Anchors, in particular concrete anchors

43

Front shaft section

45

Rear or rearward shaft section

46

cutting thread

47

insertion section

48

Additional profiling between the flanks of the cutting thread

49

intermediate section

51

Load application with connection thread

52

Extended shaft area

53

Tool engagement means for transmitting torque

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2007/012417 [0032, 0046]

Claims (15)

Lifting device ( 9 ) - a platen ( 11 ) with a bottom and a top ( 15 ), wherein the underside as a support surface ( 13 ), - a multi-legged handle ( 19 ), which with his thighs ( 21 . 23 ) on the top ( 15 ) of the support plate is attached, and - at least one through the support plate ( 11 ) passing through hole ( 25 . 27 ), for receiving a bolt or anchor rod. Lifting device according to one of the preceding claims, characterized in that the multi-legged handle has two legs ( 21 . 23 ), in particular that the handle ( 19 ) Is U-shaped. Lifting device according to one of the preceding claims, characterized in that the at least one borehole ( 25 . 27 ) is arranged normal to the support surface. Lifting device according to one of the preceding claims, characterized in that the at least one borehole from a borehole ( 25 ), which is centered on the handle ( 19 ) is arranged, in particular which on the axis of symmetry ( 24 ) of the handle is arranged. Lifting device according to the preceding claim, characterized in that a first platen area ( 31 ) around the borehole ( 25 ), which is arranged centrally to the handle, an increased thickness in comparison to peripheral support plate areas ( 33 ) having. Lifting device according to one of the two preceding claims, characterized in that the borehole ( 25 ), which is centered on the handle ( 19 ) is arranged, in particular which on the axis of symmetry ( 24 ) of the handle is arranged, has an internal thread for screwing with a bolt or anchor rod. Lifting device according to one of the preceding claims, characterized in that a plurality of boreholes ( 27 ) peripherally about the axis of symmetry ( 24 ) of the handle, in particular that four holes ( 27 ) peripherally about the axis of symmetry ( 24 ) of the handle are arranged. Lifting device according to one of the preceding claims, characterized in that it consists of at least two components welded together, wherein the support plate ( 11 ) a first component and the handle ( 19 ) forms a second component. Lifting device according to the preceding claim, characterized in that a reinforcing plate ( 35 ), which have smaller width dimensions than the support plate ( 11 ), forms a third component, which centrally under the handle and / or within the Henkelschenkel ( 21 . 23 ) is arranged. Lifting device according to one of the preceding claims, characterized in that the bearing surface ( 17 ) is designed circular, in particular the support plate ( 11 ) is cylindrical, and optionally the reinforcing plate ( 35 ) is cylindrical. System comprising a lift-off device ( 9 ) according to claim 1 and at least one bolt or anchor rod, which from the at least one borehole ( 25 . 27 ) of the lifting device is received. System according to the preceding claim 11, characterized in that the bolt or anchor rod is selected from the group of thread-cutting anchors ( 41 ), in particular a concrete anchor, for self-tapping anchoring in hard surfaces such as, preferably objects made of concrete, stone, masonry or the like. System according to the preceding claims 11-12, characterized in that the thread-cutting anchor ( 41 ) includes a substantially cylindrical shaft, which with respect to a setting direction (S) a front shaft portion ( 43 ) having a first core diameter and a rearward shaft portion ( 45 ) with a second core diameter, wherein the front shaft portion ( 43 ) a helically encircling cutting thread ( 46 ) and the rearward shaft portion ( 45 ) comprises a fastening section extending counter to the setting direction (S), which rearward shaft section (FIG. 45 ) a load application means ( 51 ) and a plea ( 53 ) for transmitting torque to the shaft. System according to the preceding claims 13, characterized in that the helically encircling cutting thread ( 46 ) Has thread flanks which enclose an acute angle with each other. System according to the preceding claims 13-14, characterized in that the shaft has a stepped core diameter, wherein the first core diameter is smaller than the second core diameter.

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