Method for connecting a spacing element with a connection strip spacing and stop holder, a wedge and a holder

Abstract

The spacer arrangement (1) for determining the mutual distance of formwork during the production of concrete structures comprises a holder (9) and a wedge (7) on which the spacer rod (3) is held in semicircular rings (21). The holder (9) has stepped recesses (39) into which the spacer rod (3) can only be inserted in the correct orientation.

Description

[0001] The invention relates to a method for connecting a spacer to a connecting iron and a spacer and stop holder arrangement.

[0002] When constructing concrete walls, two formworks must first be precisely positioned on the surface of an existing component, i.e., a substructure from which connecting reinforcing bars protrude. First, the mutual spacing between the two formworks must be precisely maintained, and second, the precise position of the formworks is essential to construct the wall in the correct position on the substructure. The formworks are held at a predetermined distance and in place using spacers and stop brackets, as is customary, and are also held together by suitable means to absorb the forces of the liquid concrete.The spacers, consisting of a spacer bar with end pieces attached to both ends, are attached to the connecting reinforcing bars, or connecting bars for short, and must be able to be aligned and fixed in place with the corresponding markings on the surface of the substructure of the future wall for precise alignment. Therefore, the spacer bar must be able to be precisely aligned with the reinforcing bar to which it is to be attached and, once aligned, also fixed in place. Since the connecting reinforcing bars do not always protrude from the surface of the structure at exactly the same point relative to the markings, the spacer bars cannot all be attached in the same way or at the same place and must therefore be alignable with respect to the axis of the connecting reinforcing bars.

[0003] Several different spacer arrangements are known from the prior art. One such spacer arrangement, as described in EP 1 197 617, essentially comprises a holder with a U-shaped cross-section that can be applied from above or from the side to a connecting iron protruding from the surface of the building. Using a wedge, at the upper end of which the spacer rod is guided in a recess, a connection between the connecting iron and the spacer rod can be achieved by driving the wedge into the holder. The disadvantage of this device is the fact that the spacer rod and the connecting iron essentially only come into contact with one another at a point due to the wedge, and only at this point are all the forces that occur axially to the spacer rod absorbed. This connection is inadequate and can lead to inaccurate positioning of walls.Furthermore, the spacer rod can slip out of the holder when the wedge is driven in.

[0004] DE 102 52 297 discloses a spacer arrangement in which the spacer rod is inserted into one of the holes in the U-shaped holder. The holder is designed such that it can be positioned laterally against the connecting iron and partially wrapped around it. Due to the force exerted by a wedge driven between the spacer rod and the connecting iron, the holder can bend apart, thus compromising the reliability of a precise and force-absorbing connection.

[0005] CH 687 471 discloses a method for installing a stop or spacer, in which the clamping device for carrying out the method of attaching a spacer bar to a reinforcement connecting iron is a U-shaped profile, on the two end faces of which there is a diametrically opposed recess on the legs for inserting the stop or spacer. A wedge that is driven in between the connecting iron and the spacer iron clamps or connects the connecting iron and spacer. The recesses on the end faces of the U-shaped profile pieces are arranged at different distances from the free edges of the legs of the profile piece in order to be able to attach the clamping device to two connecting irons of different thicknesses, i.e. with different diameters.This clamping device has the disadvantage that, on the one hand, a wedge must be used which is easily lost and difficult to handle when wearing gloves. On the other hand, for example, for the eight common diameters of connecting irons between 6 mm and 21 mm, four differently designed clamping devices must be kept in stock and brought to the construction site and then selected by the construction worker.

[0006] Furthermore, DE 102 52 296 A1 discloses a spacer element that is guided in two spaced holes in the holder, thus being permanently connected to the holder. Consequently, the spacer rod cannot slide into a cutout on its own. This document therefore assumes a completely different design.

[0007] In CH 711 156, a spacer rod is inserted into a holder, and later a wedge provided independently is driven in. A spacer rod connected to the wedge is not disclosed.

[0008] DE 298 12 311 U1 discloses a formwork stop whose cylindrical shell rests on a series of trapezoidal feet, which are additionally supported by a centrally arranged sleeve element. No prongs or points that could penetrate the concrete surface are disclosed.

[0009] EP 2 987 924 describes a stop holder for wall formwork in which the spacer is firmly connected to a wedge. Furthermore, the wedge presses the spacer directly onto a connecting iron, creating only a point-like connection at the clamping point.

[0010] An object of the present invention is to provide a method for connecting a spacer bar to a connecting iron.

[0011] A further object of the present invention is to provide a spacer arrangement which, on the one hand, can be produced cost-effectively and can be used on the construction site without any explanation effort and without prior provision of a holder matching the diameter of the connecting irons and which, in particular, ensures a perfect connection between a connecting iron and a spacer rod.

[0012] These objects are achieved by a method for connecting a spacer and stop holding rod according to the features of patent claim 1 and by a spacer arrangement according to the features of patent claim 2. Further advantageous embodiments of the spacer arrangement are described in the dependent claims.

[0013] The spacer assembly according to the invention can be pre-assembled in the factory, so that only two parts, namely the holder and the wedge with the factory-inserted spacer rod, need to be delivered to the construction site. Because this spacer assembly can be used for all common diameters of connecting irons, there is no need to keep different sizes in stock and deliver them to the construction site. Handling this assembly, which consists of only two parts, is extremely simple, and the construction worker does not have to worry about how to put the two elements together. By placing the holder against the connecting iron and placing the wedge on the holder, the wedge automatically slides into the recess corresponding to the diameter of the connecting iron. After placing the wedge on the holder and aligning the spacer rod with the marking, the wedge can be pivoted upwards until its back rests against the connecting iron.Then, simply tap the surface of the wedge with a hammer. This detaches the wedge from the spacer bar and allows it to slide downwards between it and the connecting bar. This prevents the connecting bar from coming into direct contact with the spacer bar; instead, the two elements are connected via the wedge. This creates a linear or strip-like connection between the wedge and the connecting bar at the clamping point. By driving in the wedge, the holder slides downwards slightly, and the serrations on the lower edge of the holder penetrate the surface of the substructure, optimally preventing the spacer from rotating around the axis of the connecting bar.

[0014] Inserting the wedge with the spacer rod into the holder is also made easier because the front end of the wedge is conical and therefore the wedge does not have to be placed exactly on the holder because it centers itself. Furthermore, the narrow end of the wedge runs diagonally from the back of the wedge so that the wedge is inevitably centered with regard to the connecting iron. Furthermore, this design of the wedge means that one and the same holder and only three different insertion areas in the holder can accommodate all eight common diameters of connecting iron. It is no longer necessary to select one of the three different recesses on the holder in advance; instead, the wedge with the spacer rod attached to it slides into the appropriate recess without any further action.Because the spacer rod detaches from the wedge when it is driven in, the optimal and greatest possible clamping force can always be achieved between the wedge, holder, and connecting iron. The spacer assembly can be manufactured very cost-effectively, as both the wedge and the holder can be produced from a single strip material by punching and subsequent bending in a progressive die.

[0015] The invention is explained in more detail using an illustrated embodiment. Shown are: Figure 1a perspective view of the spacer arrangement on a connecting iron, Figure 2a front view of the spacer arrangement according to Fig. 1 , Figure 3 a vertical section through the spacer arrangement, along line III-III in Fig. 4 , Figure 4 a plan view of the spacer device, according to Fig. 1, Figure 5a a side view of a wedge of the stop holder arrangement, Figure 5b a rear view of the wedge, Figure 5c a top view of the wedge, Figure 6a a solid material wedge in side view, Figure 6b a rear view of the wedge, Figure 6c a perspective view of the wedge from diagonally behind, Figure 7 a perspective view of the wedge according to Figure 6a and b with inserted spacer rod, Figure 8 a side view of the holder of the stop holder arrangement with spacer rods indicated in broken lines, Figure 9 a top view of the holder according to Fig. 8 , Figure 10 an enlarged section of the holder, the wedge and the spacer rod held therein in a sectional view through the axis of the connecting iron in Fig. 15, Figure 11 a vertical section through a spacer arrangement on a connecting iron with a diameter of 6 mm, spacer bar in recess I, wedge driven in, Figure 12 a vertical section through a spacer arrangement on a connecting iron with a diameter of 8 mm, spacer bar in recess I, before driving in the wedge, Figure 13 a vertical section through a spacer arrangement on a connecting iron with a diameter of 10 mm, spacer bar in recess II, wedge driven in, Figure 14 a vertical section through a spacer arrangement on a connecting iron with a diameter of 12 mm, spacer bar in recess II, wedge driven in, Figure 15 a vertical section through a spacer arrangement on a connecting iron with a diameter of 14 mm, spacer bar in recess II, wedge not yet driven in, Figure 16 a vertical section through a spacer arrangement on a connecting iron with a diameter of 16 mm, spacer bar in recess III,Wedge inserted, Figure 17 a vertical section through a spacer arrangement on a connecting iron with a diameter of 18 mm, spacer bar in recess III, wedge inserted, Figure 18 a vertical section through a spacer arrangement on a connecting iron with a diameter of 20 mm, spacer bar in recess III, wedge inserted, Figure 19 a top view of the wedge and the spacer bar, Figure 20 a front view of the wedge with inserted spacer bar, Figure 21 a perspective partial view of the wedge and the spacer bar in the insertion position in the holder, Figure 22 a schematic representation of the holder and the wedge with spacer bar before insertion into a stepped cutout, Figure 23 a schematic representation of the holder and the wedge with spacer bar during insertion, Figure 24 after pivoting the wedge around the axis of the spacer bar,Figure 25: a schematic representation of the holder and the wedge with spacer rod before insertion into a slot-shaped cutout on a holder. Figure 26: a schematic representation of the holder and the wedge with spacer rod during insertion. Figure 27: after a hammer blow on the wedge with the guide ring spread open. Figure 28: a schematic representation of the holder and the wedge with spacer rod before insertion into a slot-shaped cutout. Figure 29: schematic representation of the holder and the wedge with spacer rod during insertion. Figure 30: after a hammer blow on the wedge with the guide ring spread open.

[0016] Reference numeral 1 denotes a spacer arrangement. This comprises a spacer rod 3 - rod 3 for short - and an end piece 5 at at least one end of the spacer rod 3. The spacer rod 3 can be a section of reinforcing iron or another steel rod. The end piece 5 is made of plastic or concrete and prevents the steel rod 3 from causing rust damage to the surface of the concrete wall. The spacer rod 3 is held axially displaceably in a wedge 7. Furthermore, the spacer arrangement 1 comprises a holder 9 with a U-shaped cross-section (horizontal cross-section). The holder 9 can also have a closed, e.g. rectangular, cross-section. Furthermore, the Figures 1 to 4A connecting iron 11 is visible, depicting part of the reinforcement in a floor or ceiling slab of a building. The connecting iron 11 and the substructure 12 from which the connecting iron 11 protrudes are not part of the spacer assembly 1, but are only shown schematically to explain the position and function of the spacer 1, or its attachment to the connecting iron 11.

[0017] In the Figures 5 to 7 Wedge 7 is described in more detail below. Wedge 7 according to the Figures 5a-5c is produced from a steel plate by a punching and bending process. Figure 5c It can be seen that the wedge 7 has a U-shaped configuration in a horizontal section. The two side surfaces 13, 15 are conically tapered from top to bottom ( Fig. 5a ). On the back side, in the Figures 5a to 5cThe side surfaces 13, 15 are connected to one another by a web 17. A longitudinal groove 19 is preferably formed on the web 17. The groove 19 serves to engage the connecting iron 11 when the spacer arrangement is assembled and to center the wedge 7 relative to it, ie, to forcibly assume an axially parallel position and thereby form a large contact surface with the connecting iron 11.

[0018] At the lower end of the side surfaces 13, 15 of the wedge 7, which taper conically from top to bottom, a substantially semicircular guide ring 21 is formed as a holding element. The inner diameter of the guide ring 21 is slightly larger than the diameter of the spacer rod 3. The distance between the front or cutting edge 23 at the end of the guide ring 21 and the front edge 23 of the side surfaces 13, 15 is smaller than the diameter of the spacer rod 3, so that the spacer rod 3 is always held loosely but can be moved freely axially. Furthermore, the wedge 7 preferably comprises two tabs 25 at its upper end, which adjoin the side surfaces 13, 15 and are bent towards one another essentially at a right angle to the side surfaces 13, 15 and form a striking surface for driving in the wedge 7 with a tool such as a hammer.The width of the two tabs 25 essentially corresponds to the width of the side surfaces 13, 15, so that the upper edge of the web 17 connecting the two side surfaces 13, 15 ends laterally below the striking surface. Alternatively, the tabs 25 can be omitted or replaced by a single tab 25. Alternatively, the wedge 7 can also be made of die-casting or injection molding.

[0019] In the Figures 6 and 7The wedge 7 is made of solid material, for example, steel, aluminum, or plastic. The wedge 7, made of solid material, comprises a wedge element 8 with a rectangular cross-section, with a circularly formed tab 10 formed on the lower portion of the wedge element 8, which has the smallest cross-section. Both the wedge element 8 and the tab 10 as a guide ring 21 preferably taper conically, i.e., the width of the wedge 7 decreases continuously or in steps from the striking surface at the upper end of the wedge element 8 to the end of the tab 10.

[0020] Based on the Figures 8 and 9 The holder 9 will now be described in more detail. The holder 9 has a U-shaped or rectangular horizontal cross-section and consists of a stamped and bent part made of steel or a plastic molded part. The two leg surfaces 27 and 29 are on the back (in the Figures 8 and 9on the left side) by a base surface 31. The base surface 31 is preferably V-shaped and encloses an angle of approximately 135° or is in the shape of a circular segment in order to center the holder 9 after it has been placed on a connecting iron 11 and to form a large contact surface. A cutout 33 is formed in each of the two leg surfaces 27 and 29. The first edge 35 of the cutouts 33, which are closer to the base surface 31, are arranged at an acute angle to the base surface 31. The acute angle is approximately 5° to 30°. The second edges 37, i.e. the edges facing away from the base surface 31, run at an angle of approximately 30° to 45° and comprise a plurality of essentially, for example three, semicircular recesses 39. Their circle centers can lie on a straight or an arcuate line of the second edge 37 (cf. Figure 8with a straight line). The circle centers of the recesses 39 preferably lie on a straight line parallel to the edge 35. The cutouts 33 serve to accommodate the spacer rods 3, which, depending on the diameter of the connecting iron 11, are inserted into the corresponding recesses 39 or slide automatically into the corresponding recesses 39 by gravity when they touch the connecting iron 11 during insertion.

[0021] From the cross-sectional view of the holder 9, it can be seen that, in a preferred embodiment of the invention, the two leg surfaces 27, 29 are arranged conically, in such a way that the open end, i.e. at the location of the free edges of the side surfaces 27, 29, the distance is greater than in the area of ​​the base surface 31. This widening facilitates the introduction or insertion of the spacer rod 3, which is held by the wedge 7. Together with the conically arranged guide rings 21 and now the conically arranged side surfaces 27, 29 on the holder, it is possible for the wedge 7 with the spacer rod 3 to be inserted into the holder 9 without the wedge 7 having to be brought precisely close to the holder 9, and for the holder to insert itself into the correct recess 39 essentially by gravity.

[0022] As an alternative to a cutout 33 with recesses 39 arranged in steps, a cutout 33 with parallel flanks without steps can also be provided in a simple embodiment (cf. Figures 25-30 ). This design also makes it possible to use one holder 9 for several different diameters of connecting irons 11. The fixing of the spacer rod 3 to the connecting iron 11 is carried out analogously to the previous example, in that the spacer rod 3, held by the wedge 7, is inserted into the cutout 33 and slides downwards into it by itself, abutting there depending on the diameter of the connecting iron 11, and then the wedge 7 is moved downwards with a hammer blow, whereby the spacer rod 3 detaches from the wedge 7, slides further downwards and is fixed.

[0023] On the lower edges of the holder 9 or the leg surfaces 27 and 29 as well as the base surface 31, downwardly projecting protrusions 41 may be formed. These serve to anchor the holder 9 on a surface of the substructure 12 ( Fig. 8 ).

[0024] From the Figures 11 to 18 the positions of the spacer rod 3 in the spacer arrangement 1 with a stepped second edge 37 are visible.

[0025] Figure 11 shows a connecting iron 11, namely the one on the structure with the smallest diameter, with a spacer arrangement 1 in a definitively fastened state.

[0026] The spacer rod 3 lies in the recess 39 of the holder 9 in position I (see also Fig. 8). The wedge 7 has already been driven downwards, and the annular guide 21 has been spread apart so far when the wedge 7 was driven in that the spacer rod 3 has detached itself from the wedge 7 and is now clamped in the recess I. Note that the spacer rod 3 cannot slide out of the recess 39 because the distance between the recess position I and position II to the inclined surface of the wedge 7 is smaller than the diameter of the spacer rod 3.

[0027] Figure 12shows a connecting bar 11 with a larger diameter, namely 8 mm. Even an 8 mm connecting bar 11—the smallest commercially available—inevitably enters recess 39, position I, when inserted, i.e., the lowest position. In this figure, wedge 7 has not yet been driven in and is therefore only in the position where it can be inserted manually or by sliding it in. When wedge 7 is driven in, guide ring 21 opens, allowing wedge 7 to slide further downwards on its own, creating the clamping effect.

[0028] Figure 13 now shows a connecting iron 11 with a diameter of 10 mm. When inserting the wedge 7 together with the spacer rod 3 into the holder 9, the spacer rod 3 inevitably slides into position II. After driving in the wedge 7, it slides almost completely downwards, separated from the spacer rod 3, and the clamping is completed.

[0029] Figure 14shows a connecting rod with a diameter of 12 mm. Here, too, the spacer rod 3 inevitably engages in position II of the recesses when inserted, before the wedge 7 is driven downwards.

[0030] Figure 15 clearly shows that a connecting iron 11 with a diameter of 14 mm also slides into position II when the spacer rod 3 is inserted into the holder 9. An enlarged view of this initial position is shown in Figure 10 shown.

[0031] If the holder 9 is placed on a connecting iron 11 with a diameter of 16 mm, the spacer rod 3 inevitably slides into the uppermost position III, that is, the position furthest away from the spacer rod, as shown in Figure 16 This is evident because the path to position II is too narrow. After driving in the wedge 7, it slides far down again until the clamping point is reached. It is evident that the clamping point on the wedge 7 is between high up ( Fig. 16 ) and far below ( Figs. 12, 15, 18 ) varies. In Figure 17 The connecting iron 11 is already 18 mm thick. The spacer bar 3 slides again to the uppermost position III, and after the wedge is driven in, it slides down less far until complete clamping is achieved.

[0032] Also a connecting iron with a diameter of 20 mm, as in Figure 18 shown, can be connected to the same holder with a spacer rod 3. With a diameter of 20 mm, the spacer rod 3 again slides into the uppermost recess 39 (position III) and after an impact on the wedge 7, it slides only slightly downwards and still achieves the highest possible clamping force.

[0033] The Figures 19 to 21 show the design of the spacer rod 3 inserted into the wedge 7 or the guide rings 21. In the figures it can be seen that the guide rings 21 on the wedge 7 are located at their Figure 21approach the lower vertex S, ie the two surfaces formed by the guide rings 21 are conical. This conical guide facilitates the insertion of the spacer rod 3, which is held on the wedge 7, into the holder 9, as shown in the Figures 22 to 24 is shown in detail. With the hand 43, which can also be worn with a glove, the construction worker grasps the wedge 7. Since the spacer rod 3 is held in the guide rings 21, the wedge 7 automatically rotates into the Figures 21 to 24 shown position, namely the wedge 7 is on top and the spacer rod 3 is on its underside. Now the hand 43 moves in the direction of the arrow P ( Figure 22) and allows the wedge 7 with the spacer rod 3 to slide or even fall into the cutout 33 on the holder 9. The wedge 7 can be placed in any position between vertical (not shown) and horizontal on the holder 9 and then released. Due to the V-shaped arrangement of the two guide rings 21 and the conical shape of the side surfaces 13, 15 on the holder, inserting the wedge 7 into the holder 9 is unproblematic, or the wedge 7 centers itself when placed on the expanded holder 9. Now the wedge 7 slides with the spacer rod 3 (into the Figures 22-24left) downwards until the spacer bar 3 rests on the connecting bar 11. Depending on the diameter of the connecting bar 11, this can be position I, II or III of the recesses 39. In the case shown, the spacer bar 3 comes to rest in position II of the recesses 39, i.e. the middle recess 39. The spacer bar 3 is now moved axially in the holder 9 and aligned with the corresponding markings on the substructure 12. The hand 43 then pivots the wedge 7 upwards until its back, i.e. the web 17, comes into contact with the connecting bar 11. The spacer bar 3 is now already slightly fixed. The final fixation is then carried out by a blow from above on the wedge 7, as a result of which the wedge 7 is released from the held spacer bar 3 and moves downwards, making the clamping permanent.The wedge 7 is detached from the spacer rod 3 by expanding the guide rings 21 during the downward movement of the wedge 7.

[0034] The connection of the spacer bar 3 with the reinforcing iron 11 by means of a holder 9, on which the cuts 33 have parallel edges 35,37, is shown in the Figures 25-30 shown.

Claims

1. A method for connecting a spacer bar (3) to a splice bar (11) on a building part (12), comprising the following actions: - placing a holder (9) on the splicing reinforcement bar (11), - laying the spacer bar (3) in a cut-out (33) on the holder (9), - allowing the spacer bar (3) with a wedge (7) attached thereto to slide by itself into one of the semicircular recesses (3) in the notch (33), - driving in the wedge (7), - widening a guide ring (21) on the wedge (7), which guide ring (21) holds the spacer bar (3), by the spacer bar (3) retained in the semicircular recess (39), - the wedge (7) sliding further downward under the force of the blow while the spacer bar (3) is held in the recess (39) and - the wedge (7) becoming wedged between the splice bar and the spacer bar (3) resting in the recess (39), wherein the cut-out (33) for insertion of the spacer bar (3) is formed with a first edge (35) and a second edge (37), and the semicircular recesses (39) are arranged in steps on the second edge (37) of the notch (33), which edge is further away from the base (31).

2. A spacer and kicker assembly for defining the spacing of formwork elements and for accurately positioning the formwork element for a wall in the production of concrete structures on a building part (21), comprising a holder (9) that is placeable on a splice bar (11) protruding from the surface of the building part (12), a spacer bar (3) that is held axially displaceably on a wedge (7) for wedging the spacer bar (3) to the splice bar (11), and the wedge (7), the holder (9) comprising two spaced-apart side or leg faces (27, 29) that are connected to one another by a base (31) that extends at least over a region of the height of the side or leg faces (27, 29) and an open-topped cut-out (33) with a first edge (35) and a second edge (37) being formed on each of the side or leg faces (27, 29) for insertion of the spacer bar (3), characterized in that, a plurality of semicircular recesses (39) arranged in steps are formed on the second edges (37) of the two notches (33), which edges are further away from the base (31), in which recesses the spacer bar (3) on the wedge (7), when loosely set in place, is latchable and fixable in place by the wedge (7).

3. The spacer and kicker assembly according to Claim 2, characterized in that the notches (33) are inclined positively or negatively to the base (37) of the holder (9).

4. The spacer and kicker assembly according to Claim 2, characterized in that the second edges (37) comprise the recesses (39) and in that the first edges (35) are substantially straight or curved.

5. The spacer and kicker assembly according to any one of Claims 2 to 4, characterized in that the wedge (7) and the holder (9) each consist of a single sheet metal part formed by stamping and bending.

6. The spacer and kicker assembly according to any one of Claims 2 to 5, characterized in that the two side faces (27, 29) of the holder (9) widen conically outward from the base (31).

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