EP0201887B1 - Connecting and assembling device for adjacent shuttering elements, e.g. shuttering tables - Google Patents

Description

The invention relates to a device for connecting and holding formwork elements arranged next to one another, such as formwork, which has two claws which can be adjusted against frame parts of the formwork elements for compressing and bracing adjacent formwork elements (see, for example, BE-A 512 347).

For compressing and bracing adjacent formwork panels, it is known to use a device to be attached from the rear to adjacent formwork panels with two claws, which overlap the adjacent frame parts in the joint area of adjacent formwork panels and are clamped to the frame parts by means of a wedge lock on the frame parts in order to ensure the joint between the To close form panels. However, a wedge lock is not always practical because incorrect assembly is possible and there is a risk that the wedge will loosen when the concrete poured into the formwork is shaken, which can result in the connection between adjacent formwork panels even before the poured concrete has solidified is weakened. Even if the wedge is arranged vertically downward, it can loosen under the influence of the vibrating movements when the concrete is poured in, so that the tensioning device loses its function completely or at least partially.

On the other hand, a device for aligning formwork panels arranged side by side in alignment is known, which consists of two pieces of pipe inserted into one another and hook-like claws attached to them, which must be hung in special holes in the crossbars of the formwork panels to be aligned with one another. An eccentric cam is provided to tighten the device. A disadvantage of this known alignment device lies in the fact that it can only be used in connection with formwork panels in whose outer bolts holes are provided for hanging the claws. Furthermore, the assembly of the device is cumbersome and time-consuming because the formwork panels to be connected with this device must practically already be aligned with one another before the alignment device can be attached.

For connecting and holding together formwork panels arranged next to one another, a clamping device is known (BE-A 512347), which has two jaws which can be adjusted like clamps against web-shaped frame parts of the formwork panels and which can be clamped against these frame parts. For this purpose, a screw bolt is inserted through both jaws, which are pivotally connected to one another, on the threaded end of which a nut is screwed, which is to be tightened by means of a wrench for tightening the clamping device and to be loosened by means of a wrench to loosen the device.

For connecting and bracing adjacent formwork panels, it is also known (BE-A 544320) to use a tensioning device which has two arms which can be pivotally connected to one another, by means of openings which are aligned with one another in the frame parts of adjacent formwork panels, in which the free end of the arms by means of one of the Both arms in threaded engagement, rotatably mounted adjusting spindle can be pressed apart in order to align the frame parts with one another and also hold them together. For this purpose, the two arms have mutually opposite recesses into which the edges of the openings in adjacent frame parts can be pressed.

The invention has for its object to provide an inexpensive and easy to handle in any position, easy to attach device for compressing and bracing adjacent formwork elements such as formwork panels, which can also bring adjacent formwork panels into the desired alignment with each other, this device under the influence of For example, vibrations that occur during concreting do not loosen, but can easily be solved again if the device is switched off.

This object is achieved according to the invention in a device of the type mentioned at the outset in that at least one of the two claws is pivotally mounted for engagement about an axis perpendicular to the direction of attack, at least one adjusting spindle being provided for adjusting the pivotable claws, specifically for each pivotable claw expediently an adjusting spindle. Such a device is robust, easy to use and easy to use. It can be attached to formwork elements such as formwork panels with any frame, although it is also expedient to use them in conjunction with formwork panels which have corresponding bead-like depressions in cross section on the inside of the surrounding outer frame.

The claws can be pivoted by means of a spindle to compress and brace adjacent formwork elements such as formwork panels. This expediently runs perpendicular to the back of the formwork panels to be connected and is therefore easily accessible. If it has a self-locking thread, it will not loosen under the vibrating movements that occur during concreting, so that joints between neighboring formwork panels are kept securely closed during the entire operating time of the formwork. The device is extremely handy and is therefore a useful formwork aid for the formwork builder.

According to a practical embodiment of the invention, the spindle is connected to at least one of the two claws, which around an axis perpendicular to the longitudinal axis of the spindle is pivotally mounted. The spindle accordingly transmits the movements given to a swiveling claw. The risk that the device according to the invention slips when assembling the formwork before the claws thereof are fully tightened or tightened is therefore extremely low.

It is particularly expedient if the spindle and at least one of the two claws are guided in a projection provided on another claw, the spindle being guided and supported on the underside of the hollow projection and in a pivotable claw connected mother intervenes. In this embodiment, the device according to the invention consists of only three main parts, namely the two claws, one of which can be pivoted relative to the other, and the spindle which executes the pivoting movements.

However, it is also possible to provide a separate spindle for each claw, which depends on the design of the device and the arrangement of the claws with respect to one another. For example, devices for connecting external corners often require adjustment of both claws, which generally requires a separate adjusting spindle for each claw. Due to its special design and arrangement, the spindle can follow the movements of the pivotable claw, so that it is not possible to clamp or jam the spindle without a precise bearing being necessary.

The device according to the invention is accordingly inexpensive to manufacture, extremely compact and robust, and accordingly less prone to failure. For example, the claws of the device can be designed as castings. The device has a very long service life even in rough construction site operation.

On the end of each spindle protruding from the device, an operating toggle is fastened, which is easily accessible in any mounting position of the device according to the invention. This gag can have a spherical underside with which it can be supported against the attachment of the device in such a way that in every tilting position of the spindle it supports it in the same way as against the attachment and accordingly does not hinder tilting movements of the spindle. Rather, the toggle rolls on the outside of the attachment of the device, so to speak, when the spindle tilts.

According to yet another feature of the invention, each claw has two clamping and clamping surfaces at an angle to one another, so that the device according to the invention can be used both in connection with frame parts of formwork panels consisting of hollow box profiles and with formwork elements made of wood. It can also connect formwork elements to each other and close them together, one of which is made of wood and the other of metal. If the device according to the invention interacts with frames of formwork panels consisting of hollow profiles, which contain molded-in depressions for the engagement of clamping claws, the corresponding claw of the device engages with a sloping clamping and clamping surface in the relevant recess of the hollow profile and acts with a corresponding sloping wall or Flank of the depression together, while it can act with a just formed front clamping or clamping surface, for example on wooden beams or wooden pieces of formwork elements.

According to a special practical embodiment of the invention, the device has a one-piece crossmember, in the central region of which the two claws are arranged with their clamping surfaces facing one another, and in which there is a support in the central region and at the ends of the crossmember, of which at least the supports located on the outer ends of the crossbar project beyond both longitudinal sides of the crossbar. Such a device for aligning two adjacent formwork panels to be braced does not need to be hooked into the frame structure of the formwork elements to be braced together such as formwork panels before tensioning, but pulls the edge profiles of the frames of formwork elements to be aligned against one another into one with their mutually facing oblique clamping surfaces plane determined by the traverse, even if the formwork elements are not exactly aligned with each other before tensioning, but were offset from one another.

This device can be mounted both above and below the crossbars of the frame of the formwork elements to be connected to each other, because the supports located at the ends of the crossbeam protrude sufficiently over the crossbeam on both sides. Even slight inclinations of the device are unproblematic because of the laterally protruding supports, i.e. the crossbars of adjacent formwork panels, on which the ends of the crossbeam are supported, do not need to be exactly aligned or at right angles to one another.

Because of the length of the crossbar, it has suitable lever arms for aligning the adjacent formwork elements. Because of the one-piece design of the traverse, it is not only inexpensive to manufacture, but also easy to assemble. Furthermore, it is not a problem to mount the supports on one surface of the crossmember.

The supports are preferably metal plates of sufficient thickness and stability which are welded onto the metal cross-member.

Here, at least one of the two claws horizontally adjustable or slidably mounted on the crossbar, ie it is sufficient if one of the two claws is adjustable and the other is fixed. The manufacturing costs of the crossbeam can thereby be kept low. A better directivity is achieved, however, if both clamping claws can be adjusted against each other.

For aligning formwork elements to be brought next to each other in alignment, the traverse is expediently straight and elongated, but according to a further feature of the invention it can also be of an angular form, namely in order to be able to align formwork elements in the area of corner connections to one another. In this case, an adjustable claw with its own adjusting spindle is pivotably arranged on each of the two legs of the angular crossmember, so that the spars of the frame can be grasped by angularly and preferably approximately at right angles to each other switchboards arranged with two pivotable claws.

It is also expedient here if each of the adjustable claws engages with an attachment under a nut arranged on the adjusting spindle, which preferably has a rounded side, while the adjustable claws contain a correspondingly rounded recess on their attachment engaging under the nut. This means that the claws can always be adjusted correctly, while preventing the spindles from jamming when tightening or otherwise adjusting unfavorably.

The invention provides a device for compressing and bracing, possibly also for aligning, adjacent formwork elements such as formwork panels, which is easy to handle in any position, does not loosen under the influence of shaking movements and compress all known formwork elements such as formwork panels and wooden planks, firmly with one another connect and align with each other in the desired way. The device is simple, extremely robust and compact and easy to use.

• Fig. 1 eine Seitenansicht einer Ausführungsform der Vorrichtung,
• Fig. 2 eine Ansicht dieser Vorrichtung in Richtung des Pfeiles X aus Fig. 1,
• Fig. 3 eine weitere Ansicht der Vorrichtung aus Fig. 1 in der Montageposition, in der sie zwei benachbarte Schaltafeln zusammenhält,
• Fig. 4 eine Ansicht einer anderen Ausführungsform der Vorrichtung mit gerade gerichteter Traverse,
• Fig. 5 eine um 90° versetzte andere Ansicht dieser Vorrichtung in Richtung des Pfeiles Y aus Fig. 4,
• Fig. 6 eine Ansicht der Vorrichtung ähnlich wie in Fig. 4 nach Anbringen an zwei von ihr zueinander ausgerichteten und zusammengehaltenen, nebeneinander angeordneten Schaltafeln,
• Fig. 7 eine schaubildliche Ansicht einer weiteren Ausführungsform der Vorrichtung, die zum Ausrichten von zwei in einem Eckbereich einer Schalung angeordneten Schaltafeln bestimmt ist,
• Fig. 8 eine Ansicht der Vorrichtung aus Fig. 7 nach Anbringen an zwei rechtwinklig zueinander stehenden Schaltafeln und
• Fig. 9 eine Teilansicht einer weiteren abgewandelten Ausführungsform der Vorrichtung, bei der mit einer Stellspindel zwei verschwenkbar gelagerte Spannklauen in die Spannposition geschwenkt werden können.

Exemplary embodiments of the device according to the invention are shown in the drawings, namely

• 1 is a side view of an embodiment of the device,
• 2 is a view of this device in the direction of arrow X of FIG. 1,
• 3 shows a further view of the device from FIG. 1 in the assembly position in which it holds two adjacent formwork panels together,
• 4 is a view of another embodiment of the device with a straight cross-beam,
• 5 shows another view of this device offset by 90 ° in the direction of arrow Y from FIG. 4,
• 6 is a view of the device similar to that in FIG. 4 after being attached to two formwork panels arranged and held together by one another and arranged side by side, FIG.
• 7 shows a diagrammatic view of a further embodiment of the device which is intended for aligning two formwork panels arranged in a corner region of a formwork,
• Fig. 8 is a view of the device of Fig. 7 after attachment to two mutually perpendicular formwork panels and
• Fig. 9 is a partial view of a further modified embodiment of the device, in which two pivotally mounted clamping claws can be pivoted into the clamping position with an adjusting spindle.

The device 1 shown in FIGS. 1 to 3 has two mutually opposite claws 2 and 3, which are adjustable by means of a spindle 4, in order thereby to press formwork elements lying between them, such as frames 25 and 26 of adjacent formwork panels 23 and 24, towards one another and towards one another tense.

Both claws 2 and 3 are designed as cast bodies. On the claw 2 is formed as a hollow body extension 5 into which the other claw 3 projects with its lower end 7 through its outer open end 6. The claw 3 is designed as a kind of angle lever and has an eye 8 through which a hinge pin 9 is inserted, the outer ends of which lie in the side walls 10 and 11 of the extension 5. The claw 3 is pivotally mounted about the hinge pin 9 in the neck 5 and thus adjustable relative to the claw 2.

At the inner end 7 of the claw 3, a block 12 is formed, which contains an internal thread that fits on the spindle 4 and is arranged on the spindle 4. As shown in FIG. 1, the block 12 has a rectangular outline and fits between the side walls 10 and 11 of the extension 5, so that it provides lateral guidance with the eye 8 of the pivotable claw 3, which also fits between the side walls 10 and 11.

On the end of the spindle 4 protruding from the extension 5, a toggle 13 is arranged in a rotationally fixed manner therewith and serves to rotate the spindle 4 and thus to adjust the claw 3. The gag 13 has a spherical underside 14, which can lie on the substantially flat outside 15 of the projection 5, so that no matter what position the spindle 4 occupies, a jam-free contact between the gag 13 and extension 5 is always possible.

In each of the opposite walls 16 and 17 of the extension 5 there is an elongated hole 18 and 19, the width of which corresponds approximately to the diameter of the spindle 4, as shown in FIG. 2. The spindle 4 is movable in the longitudinal direction of the neck 5. To tighten the movable claw 3, the spindle 4 is rotated by means of the toggle 13 in such a way that the attachment 12 provided on it and provided with an internal thread is pulled in the direction of the wall 16 of the attachment 5. If the movable claw 3 encounters resistance, for example a formwork element, the underside 14 of the toggle 13 is pulled against the outside 15 of the projection 5 when the spindle 4 is turned further, as a result of which the clamping force is applied.

The spherical underside 14 of the toggle 13 ensures that the toggle 13 always rests on the outside 15 of the shoulder 5 with the contact required for tensioning, without the spindle 4 itself being tensioned. Rather, the spindle 4 can adjust in the elongated holes 18 and 19 in the correct position, i. H. position more or less obliquely with respect to the central axis 20 of the device.

At the outer ends of the claws 2 and 3, two clamping and clamping surfaces 21 and 22 are provided, which run at an angle to each other. The clamping and clamping surfaces 21 and 22 of the two claws 2 and 3 lie opposite one another.

One clamping or clamping surface 21 lies approximately parallel to the central axis 20 of the device 1 and is used when the claw in question comes into contact with a flat surface of a formwork element, for example a wooden plank. The other clamping and clamping surface 22 extends at an angle of approximately 35 ° to the central axis 20 of the device and comes into effect when the claw 2 or 3 in question engages in a recess 27 on the inside of the frame 25 or 26 of a formwork panel 23 or 24 as Fig.3 shows. The clamping or clamping surfaces 22 run relatively steeply, so that they exert predominantly clamping forces running perpendicular to the central axis 20 on the frames 25 and 26 located between the claws 2 and 3 and only a smaller proportion of forces running parallel to the central axis 20. Accordingly, the forces exerted by the spindle 4 are mainly used to compress the frames 25 and 26 and to tension the joints thereof, while a smaller part of these forces also serve to align the two interconnected formwork panels 23 and 24, the frames 25 and 26 of which the top of the wall 17 of the approach 5 lie, as shown in FIG. 3.

FIG. 1 also shows that the claws 2 and 3 are long enough that their head ends 28, which have the clamping and clamping surfaces 21 and 22, are close to the formwork panels 29 and 30 of the formwork panels 23 and 24, so that they rest on the frame 25 and 26 provided upstanding connecting webs 21 and 32 are pressed together using a relatively short lever arm and thus firmly and securely close the joint between adjacent formwork panels.

The spindle 4 lies approximately in the central axis 20 of the device 1 and accordingly extends approximately parallel to the two claws 2 and 3. Therefore, the toggle 13 is located on the outside 15 of the extension 5 facing away from the records 23 and 24 and is to be actuated always conveniently accessible. The spindle 4 and the block 12 seated on it are provided with a self-locking thread. The device 43 shown in FIGS. 4 to 6, intended for alignment of the adjoining formwork panels 41 and 42, has an elongated, one-piece crossmember 44, which consists of a U-profile made of sheet metal that is open on one side. At the outer ends of the crossmember 44, supports 45 and 46 are attached, which consist of bent metal sheets welded to the crossmember. The supports 45 and 46 are located on the open side of the crossmember 44 and are supported on the open front ends of the crossmember 45 with a leg 45a or 46a. 5 shows that the supports with their sides 45b and 45c or 46b and 46c project like wings over the two long sides of the crossmember 44. In the central area of the crossmember 44, a metal sheet 47 serving as a support is fastened on the open side, the outer side of which lies in one plane with the outer side of the supports 45 and 46, so that the crossmember 44 has a total of three supports which are against the frame of the formwork panels 41 and 42 to be connected to one another, as shown in FIG. 6.

From FIG. 5 it can be seen that the support 47 protrudes only slightly beyond the cross member 44.

At the left end of the support 47, as seen in FIG. 4, a clamping claw 48 is fastened thereon, which has clamping surfaces 50 and 51 facing the central axis 49 of the crossmember 44.

On the other side of the central axis 49 of the crossmember 44 there is a further clamping claw 52 with clamping surfaces 53 and 54 also pointing towards the central axis 49, which is pivotably mounted about a transverse axis 55. The pivotable claw 52 has at the outer end of its leg 52a located in the crossmember 44 a nut-like extension 56 which contains an internal thread into which the external thread of an adjusting spindle 57 fits, which runs approximately in the central axis 49 of the crossmember 44. On the end of the adjusting spindle 57 protruding from the cross member 44 through a bottom opening 58, a toggle 59 is arranged in a rotationally fixed manner, which is used to turn the adjusting spindle 57 and thus to pivot the claw 52. As shown in FIG. 1, the bottom opening 58 is designed as an elongated hole, so that the adjusting spindle 67 can move relative to the crossmember 44. The opposite end of the adjusting spindle 57 is accessible through a similar slot 60 in the support 47.

The gag 59 is supported with a spherical underside on the outside of the bottom 61 of the cross member 44, but is not directly connected to the cross member 44 itself. The adjusting spindle 57 is only screwed into the shoulder 56 of the claw 52 and is therefore captively connected only indirectly via the claw 52 and the axis 55 to the cross member 44.

Although only the clamping claw 52 is movably mounted in FIGS. 4 to 6 and the clamping claw 48 is fixed immovably on the cross member 44, the clamping claw 48 can also be used in the same way as that Store clamping claw 52 so that it can be swiveled. So that a single adjusting spindle 57 is sufficient in this embodiment, the leg of the clamping claw 48 located in the crossmember 44 is provided with a tongue or other extension which interacts positively in the clamping direction with the extension 56 of the clamping claw 52, for example projecting between extension 56 and toggle 59 .

In the embodiment according to FIGS. 7 and 8, the device 62 intended for aligning formwork panels arranged in corner areas of a formwork consists of an angular cross member 63 with a longer leg 64 and a shorter leg 65 which are at right angles to one another and are integrally connected to one another are. The legs 64 and 65 of the angled traverse 63 are, as in the embodiment according to FIGS. 4 to 6, U-shaped in cross section. At the free ends of the legs 64 and 65 there are supports 45 and 46 of the same configuration as the corresponding supports of the embodiment described above. Furthermore, a support 47 is provided in the corner region of the angle cross member 63.

A pivotable clamping claw 52 is mounted in each leg 64 and 65, the design and mounting of these claws 52 corresponding to that of the claw 52 from FIGS. 4 to 6, so that a detailed description is unnecessary here. An adjusting spindle with a toggle 59 is provided for each claw 52.

4 to 6 for attaching and detaching the device 43 to form panels 41 and 42, it is sufficient to actuate an adjusting spindle 57 via its knob 59, it is for the device 62 to be referred to as a corner clamp from FIGS. 7 and 8 required to operate two cables 59 for attaching the device 62 in order to pull the two adjoining formwork panels 41 and 42 into the corner of the clamp. For this purpose, the toggle of the adjusting spindle of the leg 65 and then the toggle of the leg 64 of the corner cross member 63 are tightened. To remove, however, no particular order of operation needs to be followed.

In the described embodiments, the clamping surface 51 of the clamping claw 48 and the clamping surface 54 of the clamping claw 51 extend at an angle of approximately 45 ° to the central axis 49 of the crossmember 44 and 63. When clamping the clamping claws 48 and 52, these clamping surfaces 51 and 54 slide on corresponding inclined surfaces of beads 66, which are located on the inside of the edge profiles 67 of the formwork panels 41 and 42, whereby the edge profiles 67 are pulled against the relevant crossmember 44 and 63 and the formwork panels 41 and 42 are aligned in the desired manner.

In the embodiment from FIG. 9, the two clamping claws 52, which are pivotably mounted on axes 55 in the crossmember 44, are only indirectly connected to the adjusting spindle 57.

In this embodiment, a nut 68 is screwed onto the adjusting spindle 57, the side of which facing the toggle 59 has a rounded portion 69. This rounding 69 fits into a bearing socket-like recess 70 of the leg 52b in the crossmember 44 of each of the two pivotably mounted clamping claws 52. When the adjusting spindle 57 is rotated in the corresponding direction, the nut 68 is moved in the direction of the toggle 59 and thus presses it Leg 52d of the clamping claws 52 in the direction of the bottom 61 of the crossmember 44, as a result of which the clamping surfaces 53, 54 of the two pivotable claws 52 approach.

Due to the rounded shape of the rounded portion 69 and the depressions 70, sufficient surface contact between the nut 68 and the pivotable clamping claws 52 is always ensured.

In order to prevent the adjusting spindle 57 from being unscrewed from the nut 68, the outer end of the adjusting spindle 57 can be slightly widened or provided with a support, for example welded on.

Since, in this embodiment, the adjusting spindle 57 is not to tilt, the toggle 59 can rest on the floor 61 of the crossmember 44.

Claims (10)

1. Conneting and assembling device for adjacent shuttering elements, e.g. shuttering tables (23, 24; 41, 42) comprising a pair of jaws (2, 3; 48, 52) adjustable against a pair of frame portions (25, 26) of the shuttering elements for connecting and assembling adjacent shuttering elements, characterized in that at least one of the pairs of jaws (3; 52) is pivotally supported around an axis (9; 55) extending vertically to the adjustment direction and that at least one adjustment spindle (4; 57) is provided for adjusting said pivotal jaws.

2. A device as defined by claim 1, characterized in that adjustment spindle (4) is connected to at least one of jaws pivotally supported around an axis (9) extending rectangularly to the longitudinal axis (20) of adjustment spindle (4).

3. Device as defined by either of claims 1 or 2, characterized in that adjustment spindle (4) and at least one of said two jaws (3) is movably guided at a shoulder (5) located at another of said jaws (2), whereas adjustment spindle (4) is pivotally guided and supported at lower surface (15) of hollow shoulder (5) and engages a nut (12) connected to pivotally supported jaw (3).

4. Device as defined by either of claims 1 to 3, characterized in that each of jaws (2, 3) is provided with a pair of angularly arranged connecting and assembling faces (21,22).

5. Device as defined by either of claims 1 to 4, characterized in that pivotal jaw (3) is designed as angle lever the angular area of which is tiltably supported at the other jaw (2).

6. Device as defined by either of claims 1 to 5, characterized in that it comprises a one-piece longitudinal tie-bar (44; 63), in the center area of which the pair of jaws (48; 52) is arranged with oppositely mating inclined assembling faces (51, 54) and that in the center part and at the ends of tie-bar (44; 63) are each arranged bearing supports (45, 46, 47) of which at least bearing supports (45, 46) located at the outer ends of said tie-bar extend beyond both longitudinal edges of tie-bar (44).

7. Device as defined by claim 6, characterized in that assembling face (54) of at least one jaw (52) is longitudinally adjustably supported in tie-bar (44; 63) and that for adjusting jaws (52) there is provided at least one adjustment spindle (57, 59) extending substantially vertical to the longitudinal direction of tie-bar (44; 63).

8. Device as defined by either of claims 6 or 7, characterized in that tie-bar (63) is of angular construction and comprises at each of legs (64, 65) a tiltable jaw (52).

9. Device as defined by either of claims 1 to 8, characterized in that a shoulder (52b) of each of adjustable jaws (52) engages the lower surface of nut (68) provided on adjustment spindle (57; 59), said nut preferably comprising a spherical face (69) while shoulder (52b) of adjustable jaw (52) extending below nut (68) comprises a mating spherical recess (70).

10. Device as defined by either of claims 1 to 9, characterized in that bearing supports (45, 46) are bent metal sheets located at the outer ends of tie-bar (44; 63).

Images