EP1644595B1 - Formwork with hookable turnbuckle device - Google Patents

Abstract

A turnbuckle device (11) for clamping concrete shell elements (1, 2), having two claws (12, 13), which may be displaced toward one another, and a wedge (18) or the like, the claws (12, 13) having legs (14, 20; 41), the legs (14, 20; 41) having contact surfaces (30, 31; 43) extending in a plane to rest on struts (7, 21; 50) of frames (5, 6) of concrete shell elements (1, 2), the legs (14, 20; 41) having lugs on their free ends (16, 22; 40), which are capable of engaging behind depressions (9, 15) in frames (5, 6) of concrete shell elements (1, 2), is characterized in that an extension (17; 42; 44; 45) is provided on a lug (16; 40) of a leg (14; 41), which extends away from the contact surface (30, 43) at least partially perpendicularly to the plane of the contact surface (30; 43) of the leg (14; 41). The mounting of the turnbuckle device is thus made easier.

Description

The invention relates to a formwork with the features of the preamble of claim 1.

A generic formwork is for example from the DE 35 45 273 A1 known.

Concrete formwork elements are used to erect boundaries for concrete bodies to be cast, such as building walls. In order to obtain pourable boundaries, usually several concrete formwork elements must be firmly connected. Turnbuckles are used to connect the concrete formwork elements.

The concrete formwork elements consist essentially of a formwork, a frame and bracing to stabilize the frame. As a rule, the turnbuckles are arranged in the area of crossings of struts and frames. In each case a claw of a turnbuckle engages around a frame portion of two concrete shell elements to be connected, and by means of, for example, a wedge, the two claws - and thus the concrete shell elements - braced against each other.

Turnbuckles of the prior art, such as according to the DE 35 45 273 A1 , abut with abutment surfaces of legs of the claws at the top of transverse struts of the concrete formwork elements. To tighten the turnbuckle, the turnbuckle must first be aligned. In particular, lugs must be inserted at the free ends of the legs in vertically extending grooves in the frame sections of the two concrete formwork elements. Once the noses of the legs of both claws are in position at the same time, the wedge can be driven to brace the claws.

The DE 84 23 109 U and the DE 100 28 556 C1 each disclose a turnbuckle device for clamping concrete formwork elements, with two displaceable claws and a wedge. At free ends of legs of the claws lugs are each provided with an extension which extends perpendicular to the plane of surfaces of the legs.

The object of the present invention is to present with a turnbuckle device strained concrete formwork elements that are easier to align and assemble.

This object is solved by the subject matters of the claims. According to the invention is in a turnbuckle device for a formwork of the type presented at a nose of a Leg an extension is provided, which extends at least partially perpendicular to the plane of the contact surface of the leg of the contact surface away.

Concrete formwork elements are welded together in the contact area of frame and struts for stabilization. While a bracing, in particular a transverse strut, is flat on its head region, the frame in the contact region has a depression or groove. The recess or groove serves in particular to allow engagement of the nose of the turnbuckle device, whereby the turnbuckle device is intended to be fixed in a direction perpendicular to the formwork facing. The depression or groove in the frame is partially covered by the head portion of the brace, leaving a cavity between the brace and the frame. If the recess is formed as a groove, then the cavity represents a breakthrough opening in the contact area. The bracing of the brace and the frame takes place only on the surfaces of the strut and the frame that are actually adjacent to one another, so that the cavity is retained after the welding.

The extension according to the invention on the nose of a leg can protrude into this cavity. The extension depends on the contact surface of the leg. The extension can protrude both vertically and obliquely with respect to the contact surface. The extension on the nose takes on a hook function. The claw to which the extension belongs can not be displaced significantly in a direction parallel to the abutment surface of the leg in a state in which the extension engages the cavity between the frame and the brace. At the same time there is at least one contact surface of a leg of the claw on the strut. This fixes the position of this claw. This position is suitable for bracing the claw.

If a claw of the turnbuckle device is fixed by the extension, the other claw of the turnbuckle device can be easily aligned with one hand to establish the clamping position of the turnbuckle device. Subsequently, a fitter can drive the wedge into the turnbuckle device without the turnbuckle having to be held. Overall, the turnbuckle device according to the invention allows a simple and quick one-hand installation by a fitter.

If there are no suitable cavities for engagement of the extension in the case of existing concrete shell elements, it is of course also possible with little effort to introduce cavities for the purpose of receiving an extension into the concrete shell elements.

To improve the hold of the turnbuckle device, it is also possible to provide a plurality of projections on lugs of different legs. The turnbuckle device must then be provided with sufficient clearance between the two claws in order to bring the turnbuckle device in a bracing position can.

In a preferred embodiment of the turnbuckle device according to the invention, the extension is provided on a nose of a leg, wherein the leg is in the mounted state of the turnbuckle on two horizontally juxtaposed concrete formwork elements can be applied to an upper side of a strut. In other words, in this embodiment, the extension with hook function is formed on one of the upper legs of a claw when the clamping direction of the claws is horizontal. In this case, the suspension of the turnbuckle in the bracing position for the fitter is particularly easy because gravity facilitates the installation of the turnbuckle in the usual position (ie with horizontal displacement of the claws for clamping) by fixing the turnbuckle in this usual position. Gravity acts as an additional means of alignment and fixation. The edges of the extension and the contact surface of the leg of the extension define the position of the claw of the leg with the extension.

Another advantageous embodiment provides that the extension is arranged on a nose of a leg of a first claw of the two claws, and the wedge is held out in the second claw. In this case, only the second claw is movable while driving the wedge, while the first claw remains stationary. As a result, the mechanical load of the extension during the assembly process is kept small.

Also advantageous is an embodiment in which the extension is designed as a hook. In particular, the extension may have, at its end remote from the contact surface, a projection which extends at least partially back to the contact surface parallel to the contact surface. To improve the engagement of the hook suitable recesses may be provided at the head end of the strut. Also, the extension completely penetrate the cavity between the strut and frame and the projection in turn surround the strut. As a result, the grip of the claw on the concrete formwork element can be improved.

Further advantages of the invention will become apparent from the description and the drawings. Likewise, according to the invention, the above-mentioned features and those which are still further developed can each be used individually for themselves or for a plurality of combinations of any kind. The embodiments shown and described are not to be understood as exhaustive enumeration, but rather have exemplary character for the description of the invention. It is understood that the claws of the turnbuckle invention need not necessarily be braced by means of a wedge because any clamping means do not affect the inventive idea.

Fig. 1a

eine schematische Darstellung von Betonschalelementen, wobei ein Hohlraum zwischen einer Querstrebe und einem Rahmenabschnitt vorhanden ist;

Fig. 1b

eine schematische Darstellung der Betonschalelemente von Fig. 1a mit einer erfindungsgemäßen Spannschlossvorrichtung;

Fig. 2

eine schematische Schnittdarstellung der erfindungsgemäßen Spannschlossvorrichtung von Fig. 1b in einer horizontalen Ebene;

Fig. 3

eine schematische Schnittdarstellung der erfindungsgemäßen Spannschlossvorrichtung von Fig. 1b in einer vertikalen Ebene;

Fig. 4a

die Nase eines Schenkels einer Pratze einer erfindungsgemäßen Spannschlossvorrichtung mit einem senkrecht zur Anlagefläche stehenden Fortsatz;

Fig. 4b

die Nase eines Schenkels einer Pratze einer erfindungsgemäßen Spannschlossvorrichtung mit einem von der Anlagefläche schräg abstehenden Fortsatz;

Fig. 4c

die Nase eines Schenkels einer Pratze einer erfindungsgemäßen Spannschlossvorrichtung mit einem als Haken ausgebildeten Fortsatz;

Fig. 4d

einen schematischen Vertikalschnitt durch die Nase von Fig. 4c in montiertem Zustand an einer Verstrebung mit Vertiefung für den Eingriff des Hakens.

The invention is illustrated in the drawing and will be explained in more detail with reference to embodiments. It shows:

Fig. 1a

a schematic representation of concrete formwork elements, wherein a cavity between a cross member and a frame portion is present;

Fig. 1b

a schematic representation of the concrete formwork elements of Fig. 1a with a turnbuckle device according to the invention;

Fig. 2

a schematic sectional view of the turnbuckle device of the invention Fig. 1b in a horizontal plane;

Fig. 3

a schematic sectional view of the turnbuckle device of the invention Fig. 1b in a vertical plane;

Fig. 4a

the nose of a leg of a claw of a turnbuckle device according to the invention with a standing perpendicular to the contact surface extension;

Fig. 4b

the nose of a leg of a claw of a turnbuckle device according to the invention with an extension projecting obliquely from the contact surface;

Fig. 4c

the nose of a leg of a claw of a turnbuckle device according to the invention with an extension formed as a hook;

Fig. 4d

a schematic vertical section through the nose of Fig. 4c in the assembled state on a strut with recess for engagement of the hook.

FIG. 1a shows a schematic representation of conventional concrete formwork elements 1 and 2, which are arranged horizontally adjacent and to be firmly connected to each other. The concrete formwork elements each have a formwork skin 3, 4. On the in the FIG. 1 front side of the Schalhäute 3, 4 is poured and hardened liquid concrete mass. On the back of the Schalhäute 3, 4 each frame 5, 6 are formed on the outer edges. The frames 5, 6 are reinforced and stiffened by struts 7, 8. The strut 7 is formed as a cross member and welded at its left in the picture head with the frame 5. The frame 5 has a groove-shaped recess 9, which extends in the vertical direction over the entire section of the frame 5 shown. In particular, the recess 9 also extends behind the left head end of the strut 7, whereby a cavity 10 in the form of an opening opening between the head end of the strut 7 and the frame 5 remains.

The FIG. 1b shows the concrete formwork elements 1, 2, which are connected to one another with a turnbuckle device 11 according to the invention. The turnbuckle device 11 has a first claw 12 and a second claw 13 and a wedge 18. The two claws 12, 13 each have two legs, of which in FIG. 1b only one upper leg 14 of the first claw 12 can be seen while the other legs are hidden. The legs surround above and below cross struts, of which only the strut 7 is visible, the frame 5, 6. Here are the upper leg with contact surfaces on the cross struts. Furthermore, lugs engage the front free ends of the legs in groove-shaped recesses 9, 15 of the frame 5, 6 a.

A nose 16 of the leg 14 engages in the recess 9 of the frame 5 a. At the bottom of the nose 16, ie on the side of the leg 14, which also represents the contact surface of the leg 14 on the strut 7, the nose 16 has a downwardly projecting extension 17. This protrudes into the cavity between the strut 7 and frame 5 inside. The extension 17 blocks a displacement of the leg 14 in the direction to the right on the strut 7. The remaining parts of the nose 16 block a displacement of the leg 14 in all other directions parallel to the support plane of the leg 14 on the strut 7, in particular on the formwork. 3 to or from this way or to the other concrete formwork element 2. This is the Leg 14 and connected to this leg 14 claw 12 of the turnbuckle device 11 largely fixed in position. Only a little game for hooking and unhooking the leg 14 remain in mobility.

The turnbuckle device 11 thus has only one degree of freedom, namely the position of the second claw 13 relative to the fixed first claw 12. The claws 12, 13 are guided like a rail into each other in the clamping direction. The degree of freedom of the second claw 13 can therefore be easily controlled by a fitter with one hand. This facilitates the assembly.

The FIG. 2 shows a schematic representation of a horizontal section through FIG. 1b just above the turnbuckle device 11 facing downward. The turnbuckle device 11 consists of the first claw 12, the second claw 13 and the wedge 18. By the propulsion of the wedge 18, a relative movement of the claws 12, 13 toward each other (in the FIG. 2 : first claw 12 to the left and second claw 13 to the right) for the purpose of bracing. The turnbuckle device 11 is loosely applied in the state shown and ready for bracing. The claws 12, 13 have legs 14, 20 which rest with their undersides as abutment surfaces on the upper sides of struts 7, 21.

At the mutually facing free ends of the legs 14, 20 lugs 16, 22 are arranged, which engage in the groove-shaped recesses 9, 15 of the frame 5, 6. As a result, movement of the turnbuckle device 11 in a direction perpendicular to the plane of the scarf skins 3, 4 is prevented by the scarf skins 3, 4. A movement of the turnbuckle device 11 on the Schalhäute 3, 4 to be blocked by the concern of the first claw 12 to the frame 5, 6.

In order to move the first claw 12 in FIG. 2 To block to the right, has the nose 16 of the leg 14 of the first claw 12 on the extension 17, which extends into the plane of FIG. 2 extends into and can come to rest on a side surface of the strut 7.

This can be seen in the vertical section of FIG. 3 be better seen. The cutting plane of FIG. 3 is in FIG. 2 marked with "III". Conversely, the section plane of FIG. 2 in FIG. 3 marked with "II".

The legs 14 and 20 are each with their lower sides, namely the contact surfaces 30, 31, on the upper sides of the struts 7, 21. Also in FIG. 3 visible are a lower leg 32 of the first paw 12 and a lower leg 33 of the second paw 13. All legs 14, 20, 32, 33 protrude with lugs 16, 22, 34, 35 in the groove-shaped recesses 9, 15 of the frame 5, 6 inside. At the nose 16 of the leg 14 is the extension 17, which points away from the contact surface 30. In the case shown, the extension 17 is perpendicular from the plane of the contact surface 30 from. The extension 17 surrounds in the FIG. 3 left upper edge of the strut 7. This will cause movement of the leg 14 in the FIG. 3 blocked to the right, since the extension 17 opposes this movement like a hook. As long as the turnbuckle device 11 is not raised counter to the gravitational force, the first claw 12 is fixed by the extension 17 which projects into the cavity 10 between the strut 7 and the frame 5. The first claw 12 has only in so far game as that the width of the extension 17 below the depth of the groove-shaped recess 9. The width of the extension 17 can be adjusted according to the invention to minimize the game of the depth of the recess 9.

The lower legs 32, 33 are projected from the underside of the struts 7, 21 projected by more than the length of the extension 17 to the normal of the contact surfaces 30, 31 (= vertical length of the extension 17) to a lifting out of the extension 17 of the To allow cavity 10. The lower legs 32, 33 thus do not require planar contact surfaces for engagement with the undersides of the struts 7, 21.

The FIGS. 4a to 4c show possible embodiments of the extensions according to the invention on the nose of a leg. FIG. 4a shows the simplest Embodiment, which also in the Figures 1b . 2 and 3 is realized. On a nose 40, which is arranged at the free end of a leg 41, an extension 42 is mounted, which extends perpendicularly from the plane of a contact surface 43 away. The contact surface 43 is in FIG. 4a essentially the underside of the leg 41.

In FIG. 4b an extension 44 is shown, which protrudes curved from the contact surface 43. Viewed vectorially, the course of the extension 44 has a portion which projects perpendicularly from the abutment surface 43 and a portion which extends parallel to the abutment surface 43. In this respect, the extension 44 extends partially perpendicular to the plane of the contact surface 43 of the contact surface 43 away. In further embodiments of an extension, it is advantageous if the vectorially perpendicular portion of the extension to the contact surface of the leg is always greater than the portion of the extension parallel to the contact surface.

The Figure 4c shows an extension 45 which is formed as a hook. The extension 45 has a first portion 46, which extends perpendicularly away from the abutment surface 43, and a second portion 47, which has a vectorial portion parallel to the abutment surface 43 and faces the main part of the leg 41. The second section 47 may also be formed as a projection on the first section 46. A portion of the extension 45, here the second portion 47, is bent back to the leg 41, so to speak.

The hook-shaped extension 45 is intended for use with specially designed struts, of which a possible strut 50 in a vertical section in FIG. 4d is shown. The strut 50 has on its the frame 5 facing the head side a recess 51 which is provided for the engagement of the second portion 47 of the hook-shaped extension 45. In this geometry, the leg 41 can be lifted only from the strut 51, when the nose 40 and the leg 41 is displaced to the inner edge 52 of the channel-shaped recess 9. This is when threading and unthreading the thigh 41 is easily taken into account by an installer, but the likelihood of unintentional slippage of the associated pawl from a tension-enabling position is greatly reduced. Thus, the assembly of the turnbuckle device according to the invention is facilitated.

In order to facilitate the installation of a turnbuckle device for concrete formwork elements, an extension is attached at least at one free end of a leg which is intended to rest on a strut of a concrete formwork element, which can be inserted into a cavity on the concrete formwork element. The extension has a hook function and fixes the leg and thus at least a part of the turnbuckle device in a suitable position for bracing the turnbuckle device.

Claims (4)

1. Formwork with concrete shell elements (1, 2) and with a turnbuckle device (11) for clamping two of the concrete shell elements (1, 2), wherein
   each of the two concrete shell elements (1, 2) has a form lining (3, 4), a frame (5, 6) and a strut (7, 21; 50), and wherein depressions (9, 15) are provided in the frames (5, 6), and wherein
   the turnbuckle device (11) has two claws (12, 13), which may be displaced with respect to one another, and a wedge (18),
   wherein the claws (12, 13) have legs (14, 20; 41),
   and the legs (14, 20; 41) have contact surfaces (30, 31; 43) extending in a plane to rest on struts (7, 21; 50) of the frames (5, 6) of the two concrete shell elements (1, 2),
   wherein the legs (14, 20; 41) have lugs (16, 22; 40) at their free ends, which engage behind the depressions (9, 15) in the frames (5, 6) of the two concrete shell elements (1, 2),
   characterized in that the depressions (9, 15) are partially covered by a head area of the struts (7, 21; 50) such that a cavity (10) remains between the head area of one of the struts (7, 21; 50) and one of the frames (5, 6), and that an extension (17; 42; 44; 45) is provided on a lug (16; 40) of a leg (14; 41), which extends away from the contact surface (30; 43) at least partially perpendicularly to the plane of the contact surface (30; 43) of the leg (14; 41), and wherein the extension (17; 42; 44; 45) projects into the cavity (10) which remains between one of the struts (7, 21; 50) and the frame (5, 6) of one of the two concrete shell elements (1, 2).
2. Formwork according to Claim 1,
   characterized in that the extension (17; 42; 44; 45) is provided on a lug (16; 40) of a leg (14; 41), the leg (14; 41) being applied to a top of a strut (7) on the two concrete shell elements (1, 2) positioned next to one another in the horizontal direction.
3. Formwork according to one of the preceding claims,
   characterized in that the extension (17; 42; 44; 45) is positioned on a lug (16; 40) of a leg (14; 41) of a first claw (12) of the two claws (12, 13), and the wedge (18) is held guided in the second claw (13).
4. Formwork according to one of the preceding claims,
   characterized in that the extension (45) is implemented as a hook.

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