WO2010069348A1

WO2010069348A1 - Clamp for press-fitting butt joints

Info

Publication number: WO2010069348A1
Application number: PCT/EP2008/010853
Authority: WO
Inventors: Jan Fandler
Original assignee: Hess-Wohnwerk Gmbh & Co. Kg
Priority date: 2008-12-18
Filing date: 2008-12-18
Publication date: 2010-06-24
Also published as: EP2370233A1

Abstract

An improved clamp for press-fitting butt joints on wooden components (A, B) to be connected is characterized, among others, by the following features. On opposing sides of the wooden components (A, B) to be connected, clamp halves (1a, 1b) can be positioned, which are connected by way of an expansion device (3) extending transversely thereto, preferably in the form of a spindle (3'). On the wooden components (A, B) to be connected, each of the two clamp halves (1a, 1b) can be connected to the wooden components to be connected at two locations provided offset with respect to a butt joint (C), wherein corresponding press-fitting forces can be generated by the expansion device.

Description

Clamp for pressing joints

The invention relates to a clamp for pressing butt joints on longitudinally pushed components, in particular in the form of a universal finger jointing ferrule according to the preamble of claim 1.

In timber construction, it is often necessary to produce wood-timber-longitudinal joint connections, for example for parallel belt girders, pent roof girders, gable roof girders with straight or curved underside, fish belly girders, truss girders or, for example, curved laminated timber girders. Likewise, such wood-timber Längsstoßverbindun- also used for vertical support, posts or columns.

For the execution of longitudinal joints (for example, also glued laminated timber), a number of connection systems have become known, which are partially installed in slots, holes or cutouts and glued to achieve higher load capacities. Often, however, a bonding of the load-bearing timber components is desired and preferred, for which in particular a so-called universal finger joint connection is suitable. Reference should be made here only to the DIN standards EN 387 (2002-04), the DIN standards 1052 (2004-08) and also to the DIN standards EN 14080 and EN 387 (2002).

As is known, in finger-jointed joints, finger-jointed bending beams, for example made of glued-laminated timber or wood-based material sections, are produced, which are pushed in the area of their universal finger joints. In such a universal finger jointing connection, the wooden components are glued together in a wedge galvanizing running transversely to the system axis and often milled over the entire cross-sectional height. In particular, when steel aids are not used, such finger joint connections are also suitable for chemical stress and for higher fire protection requirements.

In particular, in the factory, the production of a universal finger joint connection is often easy and inexpensive to perform. But if, for example, particularly long-dimensioned, so far stretched longitudinal connections for supporting timber components (for example, roof structures, etc.) are made locally on construction sites, this always requires considerable additional effort, which is why the production of a universal finger joint connection on construction sites is usually uneconomical ,

The object of the present invention is therefore to provide a device for pressing butt joints in longitudinally butted components, in particular wooden components. The object is achieved according to the features specified in claim 1. Advantageous embodiments of the invention are specified in the subclaims.

In the present invention, a device for pressing butt joints of longitudinally butted components such as wood components is created in a startling manner, which is basically simple in construction and it also allows on site on construction sites finger joints with high pressing forces and a symmetrical and To be able to perform balanced force distribution, and this with relatively little tooling effort.

According to the invention, a ferrule is proposed for the production of such universal finger joint connections, which basically comprises two ferrule halves, between which the two wooden components to be joined are joined together at their longitudinal butt joint. The inventive

Universal finger jointing ferrule has anchoring sections, which can be fastened in each case in the longitudinal direction of the timber components to be joined on both sides of the finger joint connection to the wooden components, wherein one half of the universal finger jointing ferrule on one side of the two wood components to be joined and the second half of the universal finger jointing ferrule attaches to the preferred opposite side of the wood components to be used. Both tine halves have a toggle-like construction, namely, each with a connecting device, which is offset on both sides of the wooden components to be connected between the connecting devices approximately centrally and thereby to the timber components to the outside come lie. This opens up the possibility that a spreader extending substantially transversely to the longitudinal direction of the wooden components to be connected can be inserted between the two connecting devices, which is also referred to below as an actuator. Increasing the length of this spreading device causes the anchoring sections of the clamp, which attach to both sides of the universal finger joint connection, to move toward one another, as a result of which the high pressing forces are generated for bonding the interlocking finger joints.

In this case, the spreading device in the form of the actuator preferably consists of a spindle, which can be manually set in rotation by means of a suitable tool, and to generate the pressing forces acting in the longitudinal direction of the wooden components.

Of course, it is also possible to provide a motor drive at this point or another actuator, for example by using hydraulic lifting forces etc. Restrictions do not exist in this respect.

The pressing forces to be introduced into the wood components to be connected are preferably produced by means of a spindle which projects through a corresponding bore offset from the finger joint by a wooden building support to be joined. For this purpose, this spindle can be kept freely rotatable by means of spacer bearings in the hole projecting through a timber developer. Since, as a result, the distance between the spindle and the corresponding anchoring sections of the clamp can not change the length at the one timber developer, it is preferable in the region of the connection Training device provided a so-called sliding guide on which the spindle is supported, for example via slide nuts so that it allows axial sliding movement in the longitudinal direction of the timber components to be joined.

Further advantages, details and features of the invention will become apparent from the discussion of the following embodiments. In detail:

FIG. 1 shows a schematic perspective illustration of the clamp according to the invention for improving butt joints on longitudinally pushed components;

Figure 2 is a schematic side view of the embodiment of Figure 1;

Figure 3 is a schematic plan view of the embodiment of Figure 1 or 2;

FIG. 4 shows an enlarged perspective illustration of a connecting device, for example in the form of an anchoring plate for attachment to the one side of a wooden component to be connected;

FIG. 5 shows a perspective, enlarged reproduction of a section of the upper half of the clamp;

FIG. 6 shows a corresponding perspective view of a detail of the opposite second ferrule half; and Figure 7: a stronger perspective top view of the ferrule according to the invention for explaining and generating the clamping forces.

From the drawings it can be seen that two wooden components A and B, which are also referred to below as components or first and second component, are connected at a butt joint C, i. should be glued. As a result, a wood-timber longitudinal joint can be produced. The figures explained in more detail below are partially "transparent" in order to be able to reproduce the mode of operation and the structure even more clearly.

The two wood components A and B have in this case at its front side to be joined area finger joints D, which are elaborated, so that the two wood components A and B are accurately connected to produce the universal finger joint connection while receiving high carrying forces firmly together can. In the exemplary embodiment shown, the finger joints run parallel to one another and perpendicular to the side wall Al or Bl of the two wooden components A, B lying in front in FIG. 1 and pass through the wooden components in the entire embodiment in the illustrated embodiment. In FIGS. 2 and 3, furthermore, the preferred fiber direction E of the wooden components is shown, which in the optimal case should extend as far as possible in the longitudinal direction of the wooden components to be connected, ie transversely, in particular perpendicularly to the butt joint C.

To produce a universal finger joint connection, the ferrule 1 discussed in detail below is used, the two ferrule halves 1 a and 1 b, which are connected to one another only via a spreading device 3, which will be discussed below, in the exemplary embodiment shown in the form of a threaded spindle 3 '.

It can be seen from the exemplary embodiment shown that, for example, the clamp half 1a lying on top of FIGS. 1 and 2, in each case two anchoring devices 7 which can be positioned at a distance to the left of the wooden components to be connected, preferably in the form of Anchoring plates 7 'comprises, wherein the two anchoring plates 7' are positioned so that they are attached to the wooden components opposite to the joint C. Each type of fastening is basically suitable, wherein in the illustrated embodiment, the anchoring plates 7 'have six holes 9, in each of which a wood screw 11 is screwed for the relevant wooden component (Figures 4 and 7). The bores 9 are provided with an extension section lying on top, so that the tightened wood screws 11 sunk with the screw head come to lie to the top of the anchoring plate 7 ¹ . It can be seen in particular from the illustration according to FIG. 6 that the bores 9 in the anchoring plate 7 ¹ extend obliquely to the longitudinal direction L of the wooden components A, B to be joined, but may also deviate therefrom and be oriented differently.

The anchoring plates 7 'also have a welded-round stud 7 "on the anchoring plates 7' thus formed is then in each case a connection device 13, preferably screwed in the form of a connection plate 13 'by means of a hexagonal screw 15, wherein At the same time, the mentioned round pin 7 "projects through a corresponding hole in the connection plate 13 'or at least protrudes into this hole, thereby ensuring that the forces introduced during use of the clamp are optimally achieved by means of the above-mentioned screw connection and welded round pins 7" is transferred from the connection device 13 to the anchoring device 7 and from there to the relevant timber component A and B respectively.

It also follows from the drawings that the connection device 13 is in each case provided with an articulated connection 17, preferably in the form of a pivot pin 17 ', in each of which a traction device 19, preferably in the form of a traction linkage 19' articulates.

Each of the illustrated traction devices 19 extends from the relevant articulated connection 17 with a longitudinal component in the direction of the respective other timber component and with a component of the respective timber component directed away to a force introduction portion 21 which optionally slightly angled and preferably at least approximately parallel to the longitudinal direction L to be connected Wooden components A, B runs. This force introduction section 21 connects in each case the two apparent from the figures, from the associated pivot pin 17 'obliquely to each other running Zuggestänge 19', wherein the Zuggestänge 19 'each in the region of the force introduction portion 21 with this fertilize further joint 23 also preferably in the form of pivot pin 23 'are connected.

From the attached figures also shows that the Zuggestänge 19 'and the force introduction portions 21 are each formed as double rods, in the embodiment shown consists of a flat steel or flat material, which are parallel to each other.

The ferrule half Ib lying opposite the ferrule half 1a shown above in FIGS. 1 to 4 is constructed identically so that the two ferrule halves 1a and 1b are at least approximately symmetrical to a plane of symmetry S extending in the longitudinal direction L and with transverse offset can be positioned between each pairwise opposite anchoring plates 7 ¹ to record the wooden components A and B to be joined.

Finally, the aforementioned spreading device 3 is also provided, which may for example comprise an actuator which acts on the two opposing force introduction sections 21 of the two ferrule halves 1a and 1b and acts between these force introduction sections. Such an actuator may consist of any suitable means or motor drives, for example also a hydraulic lifting device, e.g. extends over a rod-shaped support structure at least in the region of a bore G, which is offset from the universal finger joint connection introduced by one of the two wood components A or B and hereby disbelieves.

In the exemplary embodiment shown, however, a threaded spindle 3 ^{1 is} preferred as the spreading device, for the sake of simplicity, which in each case lies on the side of the two associated force elements facing the wooden components. line sections 21 of the two ferrule halves Ia, Ib supported. On this pair of rods or Abstützhebeln 21 'of the first ferrule Ia belonging force introduction portion 21, a slide nut 25 is inserted, which can slide longitudinally displaceable along the support lever 21' along the arrow R4 during use of the ferrule like a sliding block or a sliding block. For this purpose, the sliding nut 25a has two opposite transverse to the longitudinal direction Zwänglängsrichtung sliding portions 25 '(Figure 5 and 6), which are provided on the two, to the wooden components facing sliding surfaces 21 "on the wood components aligned end faces of the support lever 21', whereas a further centering section 25 "passes through the spacing space between the two support levers 21 ', which run parallel to one another, of the upper or first force introduction section 21, 21a. As a result, the upper sliding guide 121a is generated between the sliding shoe-like sliding nut 25a and the force introduction section 21 belonging to the first ferrule half 1a.

The threaded spindle 3 ^■ is also based on the force application portion 21b shown in FIGS underlying second ferrule half Ib freely rotatable, and there engages, for example, in a corresponding bore of the gleitschuhähnlichen thrust bearing 25b, whereas in the embodiment shown in the figures, overhead or first ferrule half of the spindle 3 'the force introduction section 21 projects beyond the top and ends in a tool holder 29, to start here to generate a rotational movement of the threaded spindle 3' can.

Due to this structure, a basic construction results for those ferrule halves 1a in side view, which approximate is triangular or trapezoidal, namely with two remote, to be supported on the two wooden components base portions or distant bolts 17, 17 'and the more centrally and more distant force introduction portion, which is preferably also formed by two less widely spaced bearing pin 23 ^■ , The overall construction can be approximately designated diamond-shaped with the two ferrule halves 1a and 1b and the two wooden components A and B extending therebetween.

From the described structure also shows that the two ferrule halves Ia and Ib begin on two opposite sides of the wood components A, B to be joined, so come to rest in a common plane with the wood components A, B to be joined. In principle, an attachment to the timber components would not be possible on the opposite sides, but also on the perpendicular surfaces, for example, if not an anchoring plate, but a cross-sectionally U-shaped anchoring plate is used, so that the screws on the components to be joined A, B would be set at 90 "offset side surfaces, so here the anchoring parts would be attached to the wood components .This would, however, in principle provide no advantages, but only complicate the handling.

The following section deals with the assembly of the clamp on the wooden components.

To mount the clamp 1 illustrated the four anchoring devices 7 are marked preferably in the form of the described anchor plates 7 ^■ to previously Sites on two opposite sides each attached to the wooden components A, B to be joined. Furthermore, one of the two wooden components, in the illustrated embodiment, the timber component B, provided with a transverse bore G at a marked point, wherein the transverse bore G is preferably introduced transversely to the alignment of the mutually parallel finger joints D of the timber component. In the transverse bore G are at the opposite outlet openings of the component B spacer bearing 27 (Figure 2) used, which ensure that the threaded spindle 3 ', which passes through the threaded hole G, can be rotated as frictionless as possible in this transverse bore.

If the components A, B to be connected are positioned at a distance of a few centimeters, for example the lower or second ferrule half 1b with its connection devices 13 or connection plates 13 'and the associated tension rods 19' including the associated hinge pins 23 'on the anchoring plates 7 ¹ are screwed by means of the aforementioned hexagon screws 15.

Before the hexagonal screws 15 can be screwed into the thread of the respective anchoring plate 7 ¹ , the preferably in the form of a round pin 7 "formed engaging projection, which is preferably welded to the connecting device 13 of the connection plate 13 ', in the provided bore on the anchoring plate. 7 The thrust bearing 25 b may be inserted into the lower or second sliding guide 121 b formed on the lower or second force introduction portion 21.

Then the threaded spindle 3 ^■ through the Querboh- is tion G, so inserted through the component B and used with the guide pin in the thrust bearing 25 b. On the threaded spindle 3 'is the associated, lying on the other side of the components A, B slide nut 25a already turned on.

The overhead or first ferrule half 1a with its two connection devices 13 and the associated pivot pin 17 ', the drawbars 19' and the overhead sliding guide 121a (here again at the associated force introduction section 21 in cooperation with the sliding nut 25a is formed) is bolted to the two anchoring plates 7 ¹ analogous to the component base. The appropriate hexagon screws 15 must be tightened sufficiently with a wrench. The slide nut 25a is to be rotated so as to be received by the slide guide 121a. Now, the ferrule is ready for use, which can already be noted at this point that the disassembly of the ferrule in the reverse order is preferred.

In order to carry out the connection of the timber components now is on the threaded spindle 3 'according to rotational movement Rl force introduced and the threaded spindle 3' in corresponding rotation. For this purpose, the threaded spindle 3 'at its upper, over the force introduction portion 21 upwardly projecting portion with the aforementioned tool holder 29 is provided.

The rotational movement of the threaded spindle 3 'is performed so that in the sense of spreading the two opposing force introduction sections 21 from each other be removed, so the distance increases so continuously. With a corresponding rotational movement of the spindle, therefore, the distance between the thrust bearing 25b and the sliding nut 25a, which is counteracted in the corresponding sliding guide 121a, increases. At the opposite thrust bearing 25b of the second ferrule half Ib, the threaded spindle 3 ¹ , as mentioned, is guided with a journal in a bearing sleeve 31 and prevents the tilting of the thrust bearing 25b during the sliding movement in accordance with the arrow R4.

The increase in distance between the sliding nut 25a and the thrust bearing 25b (ie between the remote force introduction sections on the threaded spindle 3 ') thus leads to an increase in distance between the two sliding guides 121a and 121b.

From there, via the force introduction sections 21a, 21b and via the associated pivot pins 23 ', the articulated drawstrings 19' are adjusted increasingly obliquely to the longitudinal direction L of the wooden components A, B to be connected, via which the anchoring and connection devices fastened on each side of the butt joint C 7, 13 so that the distance increase according to arrow representation R2 (FIG. 2) (due to the threaded spindle 3 'offset in rotation) results in a merging and compression of the two components A, B to be connected according to FIG Arrow depiction R3 (Figure 7) can be implemented. The movement between the components A and B ends in a firm contact between the two wooden components. During the movement of the components A and B, the force introduction portions 21a and 21b slide through the formed sliding guide 121a and 121b via the slide nut 25a on the top side of the component (ie in the region of the first ferrule half 1a) or over the thrust bearing 25b on the component bottom side (in the region of the second ferrule half 1b). This movement is shown according to arrow R4 in Figure 2. With the component contact, the pressing pressure builds up in the butt joint C on further rotation of the threaded spindle 3 'according to the arrow Rl.

In summary, it can thus be stated that by means of the ferrule according to the invention an optimal symmetrical compression of butt joint C can be carried out, in particular on longitudinally abutted components, whereby the forces on the opposite sides over the entire thickness of the components are evenly distributed due to the symmetrical construction of the two ferrule halves be initiated.

The illustrated universal finger jointing ferrule is designed for a component length and component width independent application. The thickness of the components A, B may vary as well as the length of the threaded spindle 3 ', which only has to be made sufficiently long to be guided by the respective component A, B, taking into account the additionally required spindle length, which is necessary on the component lower or component upper side. For timber-specific application in the form of compression of a universal finger joint connection, the illustrated ferrule is optimized, so that for attaching the ferrule, the components to be joined must be penetrated only slightly through a hole and weakened. The only connection of the mechanics on the two opposing sides of the component, in particular the component upper side and the component lower side, takes place via the Winding spindle 3 '.

The decision is significant that by operating the spreader, preferably by rotating a threaded spindle provided 3 ¹ a connected thereto linkage is spread. From the geometry of the linkage results in the contraction of the components to be joined to the frontal contact of the two components together. By further actuation of the spreading device, in particular by further rotation of the threaded spindle 3 ', the required pressing force can then be bored at the butt joint. It can be transmitted in the region of the butt joint with the illustrated ferrule high pressing forces. The achieved pressing force in the butt joint, for example, 50% higher than the applied pressure force in the threaded spindle. This results from the load condition adjusting linkage angle with respect to the longitudinal direction L of the components of, for example, 10 'to 50' or 20 'to 40', preferably by 30 '.

As explained, the threaded spindle penetrates one of the components to be pressed, wherein the threaded spindle is slidably mounted in this bore, so that the threaded spindle lies outside the butt joint C. Due to the design, this results in an asymmetrical construction. The asymmetrically designed sliding guide allows optimal guidance of the drawbar, so that the threaded spindle experiences no transverse load and skew.

Ultimately, the structure of the clamp with the two ferrule halves is designed so that the sole connection of the two ferrule halves with the spreader results in a floating arrangement with the Consequence that automatically a uniform force distribution with respect to both ferrule halves can be achieved, so that the introduced over the upper and lower ferrule halves forces symmetrically, ie with the same size and same direction, namely in the longitudinal direction L are introduced to the components to be connected ,

Claims

Claims;

1. Ferrule for pressing butt joints (C) on components to be joined (A, B), preferably for pressing two components (A, B) together with a universal finger jointing joint (D), with the following features: the ferrule (1) comprises two ferrule halves (Ia, Ib) about which in the longitudinal or connecting direction (L, R3) Verpresskräfte can be generated, the two ferrule halves (Ia, Ib) are positioned in opposite directions at a distance from each other and over a spreader (3) extending transversely to the longitudinal or pressing direction (L, R3) is connected to one another, each of the two ferrule halves (Ia, Ib) comprises two spaced apart in the longitudinal and / or pressing direction (L, R3) Anchoring devices (7), wherein the one anchoring device (7) each with the one component (A) and the further anchoring device (7) of each ferrule half (Ia, Ib) is connectable to the further component (B), the Spreader (3) is with the two ferrule halves ( Ia, Ib) over two in the longitudinal direction of the Spreader (3) offset from each other force introduction sections (21; 21a, 21b) connected and / or supported thereon whose distance perpendicular to the longitudinal or pressing direction (L, R3) is greater than the distance perpendicular to the longitudinal or pressing direction (L, R3 ) between the anchoring means (7) of one ferrule half (Ia) to the anchoring means (7) of the second ferrule half (Ib), and the respective force introduction portion (21a, 21b) of each ferrule half (Ia, Ib) connected to the associated anchoring device (7) so that an increase in the distance between the two force introduction sections (21a, 21b) between the two ferrule halves (Ia, Ib) to a shortening of the distance between the associated anchoring means (7) of each forcing Half (Ia, Ib) leads.

2. clamp according to claim 1, characterized in that the force introduction portion (21 a, 21 b) as a sliding guide

(121a, 121b) is formed, on which the spreading device (3) in the longitudinal or pressing direction (L, R3) or substantially in the longitudinal or pressing direction (L, R3) slidably supported.

3. clamp according to claim 1 or 2, characterized in that the spreading device (3) comprises a threaded spindle (3 ').

4. clamp according to claim 3, characterized in that the threaded spindle (3 ¹ ) at one end in a thrust bearing (25 b) freely rotatably supported, which along a sliding guide (121 b) relative to the associated Krafteinin- line section (21b) is relatively adjustable.

5. clamp according to one of claims 3 or 4, characterized in that the threaded spindle (3 ¹ ) on the first ferrule half (Ia) passes through a sliding nut (25 a) and preferably the force introduction portion (21 a) projects beyond, wherein the sliding nut (25 a ) is adjustable along the sliding guide (121a) relative to the associated force introduction portion (21a).

6. clamp according to one of claims 3 to 5, characterized in that the force introduction portions (21; 21a, 21b) are hingedly connected to their respective longitudinal direction (L) opposite sides with a pulling device (19) extending in the opposite direction to their remote ends with an associated anchoring device (7) are hinged or connectable.

7. clamp according to claim 6, characterized in that the pulling device (19) consists of a pull rod (19 ¹ ), which preferably comprises two mutually parallel tie rods.

8. clamp according to one of claims 1 to 7, characterized in that each ferrule half (Ia, Ib) is triangular or trapezoidal or similar, wherein in the vertices of the trapezoidal or trapezoidally shaped ferrule half (Ia, Ib) each one articulated connection (17, 23) are preferably provided in the form of pivot pins (17 ', 23').

9. clamp according to one of claims 1 to 8, characterized indicates that the two ferrule halves (Ia, Ib) each comprise at their distal ends a connection device (13), preferably in the form of a connection plate (13 '), which can be fastened to anchoring devices (7), which in turn are attached to the components to be connected (A, B) are attachable.

10. Clamping device according to claim 9, characterized in that the anchoring means (7) and an associated connection device (13) can be fixed relative to one another by means of a positive engagement, preferably in the form of a round pin (7 ") and a bore (9) respective anchoring device (7) and a connection device (13) are also connected to one another via at least one screw connection (15).

11. A ferrule according to any one of claims 1 to 10, characterized in that the force introduction portions (21, 21a, 21b) each comprise two mutually parallel support lever (21 '), whereby a sliding guide (121a, 121b) is formed, at which the spreading device (3) preferably in the form of a threaded spindle (3 ') slidably supported.

12. clamp according to one of claims 1 to 11, characterized in that the angle between the drawbar (19) preferably in the form of the drawbar (19 ') and the longitudinal or pressing direction (L, R3) between 10' and 50 ', preferably between 20 'and 40', in particular about 3O-.