AU2015306189A1

AU2015306189A1 - Anchor device of a concrete wall form, form element, and method for mounting an anchor device

Info

Publication number: AU2015306189A1
Application number: AU2015306189A
Authority: AU
Inventors: Jürgen Brecht
Original assignee: REDIMA AG
Current assignee: REDIMA AG
Priority date: 2014-08-16
Filing date: 2015-08-17
Publication date: 2017-04-06
Also published as: DE102014012037A1; WO2016026812A1; EP3180483A1

Abstract

The invention relates to an anchor device of a concrete wall form (1) having two opposite form elements (2, 3), which can be connected and locked to each other by means of an anchor rod (14) of the anchor device (13), which anchor rod has an external thread, characterized in that the anchor device (13) comprises an anchor nut unit (15), which can be fitted on the one form element (2) and fastened therein, an exchangeable sleeve (16), which is associated with the anchor nut unit (15) and can be fitted on the other form element (3) and fastened therein, and a longitudinal channel (47) for receiving the anchor rod (14) in a locking-free manner, the anchor rod (14) being able to be screwed onto the anchor nut unit (15) of the one form element (2) at one end and being lockable on the other form element (3) by means of a closing unit (54) at the other end while extending through the longitudinal channel (47) in the exchangeable sleeve (16), each form element (2, 3) having accommodating openings (11), in which the anchor nut unit (15) or the exchangeable sleeve (16) can be selectively fitted and fastened, the anchor nut unit (15) and the exchangeable sleeve (16) being able to be fastened onto the form elements (2, 3) or in the accommodating openings (11) of the form elements (2, 3) in each case by means of a quick fastening device (55).

Description

1

Anchor device of a concrete wall form, form element, and method for mounting an anchor device

The invention concerns an anchor device of a concrete wall form with two oppositely situated form elements, which can be connected and locked to each other by means of an anchor rod of the anchor device having an external thread. The invention also concerns a form element of a concrete wall form with at least one receiving opening for an anchor rod of an anchor device, by means of which two of these form elements can be connected and locked to each other. Moreover, the invention concerns a method for mounting an anchor device on two form elements of a concrete wall form being anchored together.

From DE 10 2010 002 108 A1 there is known an anchor device with an anchor rod, which extends through anchor openings in two oppositely positioned form elements. The fastening of the anchor rod is done at the outer or back sides of the two form elements by means of a respective locking device, which comprises a threaded nut element which can be screwed directly or indirectly onto the anchor rod. The locking devices can be secured by fastening means on the outer or back sides of the two form elements, so that the two form elements are braced against each other via the anchor rod under both tensile and compressive loading.

From DE 102 45 187 B4 there is known an anchor device with an anchor rod which extends through anchor openings in two oppositely positioned form elements. A sheathing or spacing tube is arranged on the anchor rod between the two form elements, having at both end faces an abutment element and a sealing element for sealing on the form element. The sheathing or spacing tube as well as the abutment elements and the sealing elements have distinctly larger outer diameters than the diameters of the anchor openings in the form elements.

8752313_1 (GHMatters) P105167.AU 2

From DE 34 05 976 A1 there is known an anchor device of a concrete wall form of this kind, by which two oppositely situated form elements can be connected and locked to each other by means of an anchor rod of the anchor device having an external thread. Identical clamping bodies are installed in openings of each of the two form elements, in which an anchor nut is received. During the assembly of the anchor device, the two anchor nuts are screwed onto the anchor rod on both sides. Each clamping body is secured against slipping out axially and against twisting by means of an attachable bracket, which engages with an outside flange of the clamping body and lies by one portion next to a cam provided on the flange.

The problem which the invention proposes to solve is to create an anchor device of the kind mentioned above which is improved in its functionality as compared to the known devices and which is easier to assemble. Furthermore, an aforementioned form element should be indicated which is improved in regard to easier assembly when constructing a concrete wall form. Finally, an aforementioned method should be indicated making possible an easier assembly.

These problems are solved by an anchor device with the features of claim 1, by a form element with the features of claim 11, by a concrete wall form with the features of claim 16 and by a method with the features of claim 17.

Advantageous embodiments of the invention are indicated in the dependent claims.

Thus, since an anchor device according to the invention comprises an anchor nut unit which can be fitted on and fastened in the one or first form element and an exchangeable sleeve, which is associated with the anchor nut unit and which can be fitted on and fastened in the other or second form element, wherein the anchor rod on the one hand can be screwed on the anchor nut unit of the one form element and on the other hand it is surrounded by a central longitudinal 8752313_1 (GHMallers) P105167.AU 3 channel of the exchangeable sleeve and can be locked by means of a closing unit or closing nut on the other form element, large tensile forces can be transmitted, such as are applied to the two form elements by the concrete poured in between them.

The exchangeable sleeve reduces the cross section of the receiving opening to the size needed for the passage of the anchor rod, so that the anchor rod can be received in the longitudinal channel with play or even without play. However, the exchangeable sleeve itself has no anchor nut or locking device for the axial securing of the anchor rod on the exchangeable sleeve, so that the anchor rod is received in a locking-free manner in the exchangeable sleeve. The exchangeable sleeve can be provided in different shapes as an easily replaceable part and used as need be. In particular, the exchangeable sleeve is always received inside the form element and does not stick out axially beyond its two outer surfaces. In this way, the stacking on one another of form elements outfitted with exchangeable sleeves is not hindered.

By the anchor nut unit is meant a component having an internal threading onto which the anchor rod having an external threading can be screwed from the side with the second form element. The internal threading can be an integral part of the anchor nut unit or it is for example a nut or a threaded sleeve which is received in the anchor nut unit and secured therein, also in particular prevented from twisting, so that it cannot twist along with the anchor rod when being screwed on or off.

According to one especially preferred embodiment, each form element contains receiving openings in which the anchor nut unit or the exchangeable sleeve can be optionally fitted and secured. In particular, the receiving openings or the bearing sleeves forming the receiving openings and arranged in the form element have the same diameter. The form element can be a simple sheet, in which boreholes are provided as the receiving openings. The form element can 8752313_1 (GHMatters) P105167.AU 4 also be constructed from several spars and/or beams and the receiving openings can be contained in different parts, being advisedly arranged in stable spars, for example, or they are formed by bearing sleeves which are fitted, e.g., in boreholes in the spars and glued or welded therein. Thanks to the identical or similar shape and especially the same diameter of all receiving openings, the anchor nut units and exchangeable sleeves formed with the same outer diameter are universally usable. Thus, for example, any given form element can be outfitted with anchor nut units and another form element can be outfitted with exchangeable sleeves and these two form elements prepared in this way can than be set up opposite each other as a concrete wall form.

The anchor device of the invention is thus suited to fastening the anchor rod by means of an anchor nut unit in the one form element and by means of an exchangeable sleeve with outside closing unit or closing nut on the other form element. At first, two form elements of a concrete wall form that are being connected together can be outfitted only with exchangeable sleeves, allowing a connecting of the two form elements via an anchor rod and closing nuts screwed on at the outside on either side. If access from the outside to one or the two form elements is restricted at the site where the concrete wall form is constructed, anchor nut units can temporarily be fitted in this form element in place of the exchangeable sleeves, so that a handling and assembly of the anchor device from one side is possible.

An especially preferred embodiment calls for a sheathing tube arranged or able to be arranged on the anchor rod, extending between the anchor nut unit and the exchangeable sleeve in the spacing between the two form elements or on the form elements. The sheathing tube, which can also be called a spacing tube, is adapted in its length to the thickness of the concrete wall being produced. The sheathing tube prevents direct contact of the concrete with the anchor 8752313_1 (GHMallers) P105167.AU 5 rod and holds the anchor nut unit and the exchangeable sleeve and thus the two form elements at the desired distance when the anchor rod is tensioned. In particular, the sheathing tube is sealed at its two ends against the anchor nut unit and the exchangeable sleeve. For this, a sealing element can be used, or the sheathing tube has a sealing flange at its end face, especially one which is radially enlarged. However, the maximum outer diameter of the sheathing tube is always less than the diameter of the receiving opening, so that the sheathing tube, optionally with the sealing enlargement, can be inserted through the receiving opening.

Advisedly, the anchor nut unit and the exchangeable sleeve can be removably secured on the form elements or in the receiving openings of the form elements or the bearing sleeves by means of quick fastening devices. This secures the anchor nut units and the exchangeable sleeves from falling out, both during transport of the form elements and during assembly and in the installed state. Furthermore, the quick fastening device can provide an axial force transmittal or supporting force between the anchor nut units or the exchangeable sleeves and the respective form elements thanks to the axial securing of the anchor nut units and the exchangeable sleeves.

It is especially preferred that the quick fastening device be arranged exclusively inside the form element. By this is meant that no part of the quick fastening device sticks out at the back side of the form element opposite the form sheet. The quick fastening device is to be operated from this outer or back side of the form element.

Advisedly, the anchor nut unit contains an interior anchor nut which is secured against twisting, into which the anchor rod can be screwed, and the anchor nut is braced in the anchor nut unit for transmittal of tensile and compressive force.

8752313_1 (GHMatters) P105167.AU 6

For the force transmittal it can be provided that the anchor nut unit has a radially enlarged bearing flange for the outside axial bracing against the form element. In this way, large axial tensile forces can be transmitted.

If the anchor nut is received in the anchor nut unit with radial play and/or able to swivel relative to the longitudinal axis, the anchor rod arranged at a slant by a radial offset of the associated receiving openings in the two oppositely positioned form elements can nevertheless produce a secure anchoring. It may also be advisable for this to have the longitudinal channel of the exchangeable sleeve conically tapering in the insertion direction of the anchor rod and to have the anchor rod run at an angle to the longitudinal axis of the exchangeable sleeve. A sufficient surface for the bearing of the seal of the sheathing tube will still remain at the front end wall of the exchangeable sleeve.

In one preferred embodiment, the quick fastening device comprises a locking pin, which is movably mounted on the form element and can move between a position of rest with no locking engagement to the anchor nut unit or the exchangeable sleeve and a locking position in locking engagement with the anchor nut unit or the exchangeable sleeve, the locking pin being arranged especially in its locking position entirely inside the form element. However, the quick fastening device can also have other kinds of closing or locking arrangements.

When a locking web of the locking pin forms a force-transmitting locking connection between the bearing sleeve and the inserted anchor nut unit or exchangeable sleeve, one can prevent the locking pin itself from being subjected to the axially acting locking force, so that its bearing is also not significantly loaded by the locking force.

8752313_1 (GHMatters) P105167.AU 7

In a preferred design, a spacing ring is fitted in a borehole of the form sheet which is concentric to the receiving opening and surrounds a front-end portion of the inserted anchor nut unit or exchangeable sleeve in a tight or sealing manner.

The spacing ring can have a seal for sealing off the anchor nut unit or exchangeable sleeve. Alternatively or additionally, the spacing ring and an associated front-end portion of the inserted anchor nut unit or exchangeable sleeve can be formed with mutually adapted conical sealing surfaces.

It is especially preferable for the spacing ring to be elastically mounted against the form sheet or in particular to be radially expandable by a radial slit for its adapting to an associated front-end portion of the inserted anchor nut unit or exchangeable sleeve. The spacing ring can have a smaller inner diameter than the front-end portion of the inserted anchor nut unit or exchangeable sleeve, so that when the front-end portion is installed it expands the smaller-dimensioned spacing ring and therefore the spacing ring bears against the front-end portion in a prestressed sealing manner.

In a form element according to the invention per claim 11, at least one receiving opening or a bearing sleeve forming the receiving opening is provided for the optional installing of an anchor nut unit or an exchangeable sleeve and the respective anchor nut unit or exchangeable sleeve can be removably secured to the form element by means of a quick fastening device. This produces the benefits already mentioned above for the anchor device.

Advisedly, the quick fastening device contains a locking pin, which is movably mounted on the form element and can move between a position of rest with no locking engagement to the anchor nut unit or the exchangeable sleeve and a locking position in locking engagement with the anchor nut unit or the exchangeable sleeve.

8752313_1 (GHMatters) P105167.AU 8

In a preferred design, a spar of the form element, especially a hollow spar, comprises a bearing sleeve containing the receiving opening, wherein the spar receives the locking pin, especially in movable manner at two oppositely positioned openings of the spar, and the locking pin or a locking web of the locking pin transmits a locking force substantially between the bearing sleeve and the inserted anchor nut unit or exchangeable sleeve. Thus, the locking pin is for the most part with no reaction forces acting on its bearing arrangement or entirely without such forces.

Advisedly, the quick fastening device can be activated and is arranged solely inside the form element.

When a spacer ring is fitted in a borehole of a form sheet arranged on the form element and concentric to the receiving opening, this can tightly surround a front-end portion of the inserted anchor nut unit or exchangeable sleeve and seal it off against concrete slurry.

The problem is also solved by a concrete wall form with at least two of the above described form elements as well as at least one anchor device according to one of claims 1 to 10. A method for mounting an anchor device on two form elements of a concrete wall form being anchored together and positioned opposite each other is characterized in that steps la to le or steps 2a to 2e are optionally carried out, wherein the decision as to how to perform the method can be made in short order, in particular at the construction site. According to the method of the invention, one optionally carries out the following steps, whereby

Step la: an anchor nut unit of an anchor device according to one of claims 1 to 10 is fitted into a receiving opening of the first form element and axially secured therein, 8752313_1 (GHMatters) P105167.AU 9

Step lb: an anchor rod of the anchor device is led through a receiving opening in the second form element in the direction of the anchor nut unit of the first form element and screwed together with it,

Step lc: a sheathing tube is shoved onto the anchor rod and through the receiving opening of the second form element,

Step Id: an exchangeable sleeve is placed on the anchor rod and shoved into the receiving opening in the second form element and axially secured therein, and

Step le: a closing unit is arranged on the anchor rod sticking out from the exchangeable sleeve.

Optionally the following steps are provided, whereby

Step 2a: as a change from step la, instead of the anchor nut unit an exchangeable sleeve is introduced into the receiving opening of the first form element and axially secured therein,

Step 2b: the anchor rod is led through the receiving opening in the second form element in the direction of the exchangeable sleeve of the first form element,

Step 2c: the sheathing tube is shoved onto the anchor rod and through the receiving opening of the second form element,

Step 2d: an exchangeable sleeve is placed on the anchor rod and shoved into the receiving opening in the second form element and axially secured therein, and

Step 2e: a closing unit is arranged on the anchor rod sticking out from the two exchangeable sleeves.

This method enables in the first alternative a substantially simplified assembly by only a single worker and in the second alternative an assembly making use of a conventional anchor with two exchangeable sleeves and two conventional closing units, being in particular 8752313_1 (GHMatters) P105167.AU 10 conventional lock nuts. The benefits of this method also emerge from the above explanations about the anchor device of the invention.

It is especially preferred to shove a sheathing tube prior to the exchangeable sleeve onto the anchor rod and through the receiving opening of the second form element and then shove the exchangeable sleeve into this receiving opening. As compared to a known method in which the sheathing tube has to be placed in its position before setting up the second form element, the shoving of the sheathing tube through the receiving opening affords the significant benefits as described. A sample embodiment of the device and the method according to the invention shall now be described more closely, making reference to the drawing. There are shown:

Fig. 1, in a cross sectional view, a concrete wall form with two form elements as well as a mounted anchor device;

Fig. 2, in an isometric view, an anchor nut unit of the anchor device being mounted on the one form element;

Fig. 3, in an isometric view in partial sectioned representation, an anchor nut unit of Fig. 2 in a fitted position in a receiving opening of a bearing sleeve on the form element;

Fig. 4, in a sectioned view along sectioning plane B-B in Fig. 1, the anchor nut unit in the fitted position on the form element;

Fig. 5, in a sectioned view along sectioning plane A-A in Fig. 1, an exchangeable sleeve of the anchor device in the fitted position on the other form element;

Fig. 6, in an isometric view, the anchor device being mounted on the two form elements;

and 8752313_1 (GHMatters) P105167.AU 11

Fig. 7, in an isometric view, a portion of a spar of a form element with a spacing ring for sealing off a portion of the anchor nut unit or the exchangeable sleeve. A concrete wall form 1 has a first form element 2 and a second form element 3, which are set up at a distance from each other. In the representation of Fig. 1, the first left form element 2 represents a positioning formwork element which is set up as the first form element when erecting a concrete wall form, e.g., by means of push-pull props, and the second right form element 3 represents a closing form element, with which the concrete wall form 1 is closed to form an intermediate space to be filled with concrete.

Each form element 2 and 3 comprises a skeleton of spars 4 and cross braces 5 which join the spars 4 together and form a load-bearing structure, on which at least one form sheet 6 or form skin is fastened, e.g., by screws or rivets. Thus, in order to produce a concrete-poured wall, the two form elements 2 and 3 stand apart from each other with their oppositely positioned form sheets 6.

Each spar 4 is formed for example by a hollow steel profile with rectangular or square cross section. The spar 4 contains boreholes or openings 7 at regular intervals, in which cylindrical bearing sleeves 8 are fitted in planar manner to the two opposite outer surfaces 9 and 10 of the spar 4 and secured for example by welding. All bearing sleeves 8 have the same diameter with identical cylindrical receiving openings 11. Each form element 2 and 3 accordingly comprises a number of bearing sleeves 8 or receiving openings 11 in a regular grid arrangement in its load-bearing structure. Each associated form sheet 6 has indentations or boreholes 12 which are distributed according to the grid arrangement of the bearing sleeves 8 and arranged coaxially to them.

8752313_1 (GHMatters) P105167.AU 12

An anchor device 13 with which the two oppositely standing form elements 2, 3 are joined together and held firmly in opposite positioning contains an anchor rod 14 and an anchor rod fastening device with an anchor nut unit 15 and an exchangeable sleeve 16.

The anchor nut unit 15 comprises a hollow cylindrical base body 17 which is substantially rotationally symmetrical. Its outer diameter is designed such that it is fitted exactly and substantially free of play in the receiving opening 11 of the bearing sleeve 8 and can be accommodated therein. The base body 17 has at its end face a radially widened bearing flange 18, which serves as an end stop at the outer surface 9 of the spar 4 when the base body 17 is inserted into the receiving opening 11 and the hollow cylindrical inner space 19 of the base body 17 opens toward the outside here. A lug 69 projecting from the bearing flange 18 engages with an associated seat or opening 70 of the spar 4 and prevents the anchor nut unit 15 from twisting in the receiving opening 11 relative to the spar 4. An end wall 20 of the base body 17 forms the front or insertion end 21 of the base body 17 or anchor nut unit 15 which is axially opposite the bearing flange 18 and it has a central opening 22 to receive the anchor rod 14.

The anchor nut unit 15 has an axial length such that the end wall 20 of the base body 17 inserted into the receiving opening 11 is planar flush with the surface 23 of the form sheet 6. A spacing ring 24 closes an annular gap 25 between the front portion 26 of the base body 17 projecting axially from the receiving opening 11 of the bearing sleeve 8 and the borehole 12 in the form sheet 6. Advisedly, a sealing ring 27 is provided in an inner circumferential groove 28 of the spacing ring 24 and the front portion 26 of the base body 17 is sealed off against the spacing ring 24 so that concrete slurry poured into the intermediate space 29 between the two form elements 2 and 3 cannot get in between the base body 17 and the bearing sleeve 8. The spacing ring 24, which can also be called a formwork shell bushing, can have a rear-side 8752313_1 (GHMatters) P105167.AU 13 shoulder 30 opposite the surface 23 of the form sheet 6, which is held at an associated groove 31 on the form sheet 6 and secures the spacing ring 24 axially in the form sheet 6. The font portion 26 of the base body 17 is cylindrical or also in particular slightly conical in shape, so that the spacing ring 24 likewise adapted to this conical shape is arranged by press fitting on the inserted front portion 26 of the base body 17. The spacing ring 24 can be formed of metal or also plastic and can create an additional sealing by the press fitting. The spacing ring 24 can have a radial slit 71 (see Fig. 7, the form sheet 6 is not shown) and be received in the borehole 12 of the form sheet 6 by means of an elastic mounting, e.g., a thin layer of silicone on its outer circumference. The conical front portion 26 of the base body 17 expands the spacing ring 24 when shoved into the spacing ring 24 due to the contact with the likewise conically shaped inner annular surface 72 of the spacing ring 24, which can widen accordingly thanks to its radial slit 71 and bear tightly by press fitting against the front portion 26 of the base body 17.

The anchor nut unit 15 furthermore contains an anchor nut 32 with an internal thread 33, into which the anchor rod 14 can be screwed by its external thread 34. The anchor nut 32 is received centrally in the inner space 19 of the base body 17 and bears axially by an end-side shoulder 35 against a bearing surface 36 on the inner side of the end wall 20 of the base body 17. The annular support surface 36 surrounding the opening 22 can be shaped in particular slightly conical or concave relative to a cross sectional plane intersecting the longitudinal axis in perpendicular manner, so that the anchor nut 32 is also evenly supported in a slight swiveled position relative to the central longitudinal axis of the base body 17. The end-face shoulder 35 of the anchor nut 32 is accordingly adapted to the supporting surface 36.

The axial nut 32 is prevented by a rotation lock 37 from twisting in the circumferential direction, especially when the anchor rod 14 is being screwed into the anchor nut 32. The 8752313_1 (GHMallers) P105167.AU 14 rotation lock 37 contains an anti-twist ring 38, having an internal profiling 39 for example in the shape of an internal hexagon, which interacts with an external profiling 40 on the anchor nut 32, such as an external hexagon, so that the anti-twist ring 38 secured relative to the base body 17 prevents a twisting of the anchor nut 32 by virtue of the form fitting. In particular, a relative axial movement between the anti-twist ring 38 and the anchor nut 32 is not prevented, and when an appropriate play is present between the anti-twist ring 38 and the anchor nut 32 the anchor nut 32 can assume the described slight swiveled position. The securing of the anti-twist ring 38 in the rotary or circumferential direction occurs, e.g., by a form-fitting bearing of the outer circumference of the anti-twist ring 38 against the inner side of the base body 17, since the antitwist ring 38 is formed with an external hexagon profile 41, for example, which is received in an associated and corresponding internal hexagon profile 42 of the base body 17 secured against twisting. However, other profilings can also be used for a form fitting prevention of twisting.

An axial securement, e.g. in the form of a securing ring 43, is arranged in a groove at the inner side of the base body 17 in such an axial position that the anti-twist ring 38 is held substantially free of play between the radially widened shoulder 35 of the anchor nut 32 and the securing ring 43. Thus, the anchor nut 32 is also prevented by its shoulder 35, the anti-twist ring 38 and the securing ring 43 from moving axially in the direction of the opening 44 of the inner space 19 of the bearing sleeve 8 of the base body 17.

In the second form element 3, in the receiving opening 11 which is arranged roughly coaxially with the receiving opening 11 of the first form element 2 there is held an exchangeable sleeve 16. The exchangeable sleeve 16 is rotationally symmetrical to its longitudinal axis and shaped basically cylindrical, having an outer diameter adapted to the receiving opening 11, so that it can be shoved into each of the bearing sleeves 8 substantially free of play. The outer 8752313 1 (GHMallers) P105167.AU 15

diameter mounting the exchangeable sleeve 16 in the bearing sleeve 8 thus coincides with the outer diameter of the base body 17 of the anchor nut unit 15. In the sample embodiment shown, the exchangeable sleeve 16 has several annular groovelike indentations 45 at its periphery, which can be formed for reasons of material savings when the exchangeable sleeve 16 is produced, e.g., as a metal or plastic injection-molded part, and which are separated from each other and bounded off by webs 46, which are responsible for the guiding of the exchangeable sleeve 16 in the receiving opening 11 of the bearing sleeve 8. An axial central longitudinal channel 47, provided to hold the anchor rod 14, extends through the exchangeable sleeve 16. By contrast with the anchor nut unit 15, the exchangeable sleeve 16 does not contain any anchor nut or other kind of locking device for the anchor rod 14. Instead, the anchor rod 14 is held free of locking in the longitudinal channel 47. In the installed position shown in Fig. 1, the exchangeable sleeve 16 is arranged by its end wall 49 forming its front end 48 in planar manner with the surface 23 of the form sheet 6, while in this receiving opening 11 - as also for every other receiving opening 11 of the form element 3 - the annular gap 25 is also filled by a spacing ring 24 with a sealing ring 27 placed therein - corresponding to the already described installation position of the anchor nut unit 15. The rear side 50 of the exchangeable sleeve 16, situated axially opposite the front end 48, is likewise arranged in planar manner to the surrounding outer surface 9 of the spar 4. The central longitudinal channel 47 is cylindrical or conically tapering along its length from the larger entry opening 51 at the rear side 50 to the smaller exit opening 52 at the front end 48 of the exchangeable sleeve 16. A sheathing tube 53, which can also be called a spacing sleeve, surrounds the anchor rod 14 between the end wall 20 of the anchor nut unit 15 and the end wall 49 of the exchangeable sleeve 16 and bears by its two ends tightly against the two end walls 20 and 49. The length of the sheathing tube 53 is dimensioned so that it coincides with the spacing 8752313 1 (GHMatters) P105167.AU 16 between the form sheets 6 of the two form elements 2 and 3 and thus with the thickness of the concrete wall being constructed. A closing unit or closing nut 54 is screwed onto the anchor rod 14 and bears against the outer surface 9 of the spar 4 in supporting contact.

At each receiving opening 11 or bearing sleeve 8 there is provided a quick fastening device 55, by means of which the anchor nut unit 15 or exchangeable sleeve 16 received therein can be axially locked. A locking pin 56 of the quick fastening device 55, especially a cylindrical one, extends transversely to the longitudinal axis of the bearing sleeve 8 and slightly above the bearing sleeve 8 through two openings 57 and 58 in the two oppositely situated spar walls 59 of the spar 4. A locking web 60 projecting downward from the locking pin 56 can be guided at a guide slot 61 in the bearing sleeve 8 and can brace against locking forces in the transverse direction or parallel to the longitudinal axis of the bearing sleeve 8. The locking pin 56 is shoved into the spar 4 through an opening 57, corresponding to the cross section of the locking pin 56 with the locking web 60, and extends by its front end 62 in the other opening 58, formed as a borehole with a diameter corresponding to the diameter of the cylindrical locking pin 56, and is movably mounted therein. The movable mounting of the other end or rear end 63 of the locking pin 56 at the first opening 57 occurs by means of a bearing plate 64, having an opening 65 with a diameter corresponding to the diameter of the locking pin 56. The bearing plate 64 is arranged or screwed onto the spar wall 59 containing the opening 57.

The locking pin 56 can be adjusted axially between two positions by transmittal of axial force, e.g., by a blow with a hammer, to its respective front end 62 or rear end 63. In the closed position (see Fig. 5), the locking pin 56 is in its position at the right in Fig. 5, in which its locking web 60 is both guided on the guide slot 61 in the bearing sleeve 8 and also projects radially 8752313_1 (GHMatters) P105167.AU 17 inward and engages with an associated locking seat 66, arranged both on the anchor nut unit 15 and on the exchangeable sleeve 16 in corresponding position when the anchor nut unit 15 or the exchangeable sleeve 16 is received in the bearing sleeve 8. This locking seat 66 is formed for example as a circumferential groovelike indentation of the exchangeable sleeve 16, whose cross sectional shape is adapted to the locking web 60. In the case of the anchor nut unit 15, this locking seat 66 is formed for example as a locking slot in the wall of the base body 17, running transversely to the longitudinal axis.

The length of the locking web 60 in the direction of the locking pin 56 and its roughly central arrangement over the length of the locking pin 56, as well as the trend of its lower edge 67, is shown in Fig. 5. The locking web 60 limits the travel of the locking pin 56 by its respective inside bearing against the spar walls 59. Thanks to the curved trend of the lower edge 67, the locking web 60 locks the exchangeable sleeve 16 or the anchor nut unit 15 by engaging with their respective locking seat 66 while at the same time being braced against the guide slot 61 in the bearing sleeve 8 (see the representation of Fig. 5). When the locking pin 56 is moved from the closed position of Fig. 5 to its open position (movement to the left in Fig. 5), the locking web 60 only still engages by its retracted lower edge 67 with the guide slot 61 in the bearing sleeve 8, while being disengaged from the locking seat 66. The exchangeable sleeve 16 or the anchor nut unit 15 in this open locking position can be shoved into the receiving opening 11 of the bearing sleeve 8 or be pulled out therefrom.

In order to erect the concrete wall form, at first anchor nut units 15 are inserted into the receiving openings 11 of all bearing sleeves 8 of the form element 2 in the form element acting as the positioning formwork element. The specific positioning in the axial direction is achieved by the bearing of the bearing flange 18 against the spar 4, while for the correct positioning in the

8752313_1 (GHMatters) P105167.AU 18 circumferential direction (not shown) guides or markers can be used. This ensures that the locking seat 66 is arranged in the correct position for the locking by the quick fastening device 55, especially in the circumferential direction in the case of a locking seat 66 which is not fully encircling, for example. The locking pin 56 is then moved, for example by a hammer blow, from its open position into its locking position. In this way, all anchor nut units 15 are held securely in the form element 2. This assembly step can be performed on at least one form element in basically any given position of the form element, such as lying on the ground. This preliminary assembly step can be done on a plurality of form elements, and several such form elements provided with the anchor nut units 15 can be laid together and stacked prior to their use, since the respective anchor nut unit 15 on the one hand does not project beyond the form sheet 6 at its front end 21 and on the other hand only the flat bearing flange 18 sticks out from the spar 4 at its other end, which can advantageously serve as a spacer when laying down several form elements in layers.

This at least one form element 2 is positioned in the place intended for a concrete wall form. Next, a reinforcement or the like is installed or mounted on the side of the form sheet 6. After the completion of this work, the concrete wall form 1 is closed by positioning the oppositely situated form element 3 as a closing form element, such that its still empty receiving openings 11 are oriented roughly coaxially with the receiving openings 11 or the anchor nut units 15 of the first form element 2 that are installed therein.

Now, from the back side of the right form element 3 (from the right side per Fig. 6) the anchor rod 14 is led through the receiving opening 11 of the right form element 3 and screwed into the anchor nut 32 of the associated anchor nut unit 15 on the left form element 2, for which around 4 to 6 turns of the screw will be enough. Thanks to the large free aperture of the receiving 8752313_1 (GHMatters) P105167.AU 19 opening 11 in the right form element 3, a worker can also accurately line up the anchor nut 32 with the tip of the anchor rod 14 even in visual contact. If the receiving opening 11 of the right form element 3 is not exactly coaxial to the anchor nut unit 15 of the left form element 2, the anchor nut 32 can also be swiveled by around 3 to 4 degrees out from the central axis, thanks to its bearing arrangement, and thus allow the anchor rod 14 to be screwed in.

The spacing sleeve 53 can now be shoved across the free end of the anchor rod 14 onto it and through the receiving opening 11. Next, the exchangeable sleeve 16 is shoved onto the anchor rod 14 and into the receiving opening 11, pushing the spacing sleeve 53 in front of it. When the exchangeable sleeve 16 has been received in planar manner in the receiving opening 11, the spacing sleeve 53 lies tightly against both the end wall 20 of the anchor nut unit 15 and the end wall 49 of the exchangeable sleeve 16. The spacing sleeve 53 can be formed as a single piece with a conically shaped enlargement 68, in order to obtain an enlarged sealing surface at the two end walls 20 and 49. In any case, the outer diameter of this conical enlargement is smaller than the diameter of the receiving opening 11. The inserted exchangeable sleeve 16 is locked by means of the quick fastening device 55 in that the worker moves the locking pin 56, e.g., by means of a hammer blow.

Finally, the clamping or closing nut 54 is screwed onto the free end of the anchor rod 14 and tightened up, maintaining the distance between the two form elements 2 and 3 thanks to the spacing sleeve 53 and pretensioning the anchor device 13 by the tension of the spacing sleeve 53. The concrete wall form 1 is now ready for concrete pouring. The spacing sleeve 53 seals off the anchor rod 14 against the liquid concrete being poured in.

8752313_1 (GHMatters) P105167.AU 20

The dismantling of the anchor device 13 occurs in the reverse sequence. The anchor rod 14 is unscrewed from the anchor nut 32 and pulled out through the spacing sleeve 53 which remains in the concrete.

Thus, the assembly during each step can be performed by only a single worker. The sheathing tube 53 thanks to the larger receiving opening 11 after the front-end screwing in of the anchor rod 14 can be shoved onto it and pushed through the receiving opening 11. In this way, the worker’s view of the position of the anchor nut 32 through the receiving opening 11 is not impaired. Likewise, thanks to the subsequent shoving in of the exchangeable sleeve 16, the worker has visual contact with the inserted anchor rod 14 through the large receiving opening 11 which is still free.

The axially swivelable anchor nut 32 and the conical longitudinal channel 47 of the exchangeable sleeve 16 enable and facilitate the assembly and securing of the anchor rod even when the two oppositely situated receiving openings or the anchor nut unit 15 and exchangeable sleeve 16 arranged therein are at an axial offset. The anchor rod 14 is separated from the concrete being poured in by the sheathing tube 53. Thus, the anchor rod 14 need not be conically shaped, in order to remove it once again from the concrete during the dismantling of the concrete wall form. Instead, the anchor rod 14 can be a conventional cylindrical anchor rod with external thread.

Such a form element 2, 3 has a plurality of regularly arranged receiving openings 11. Several such form elements can be arranged next to each other or vertically one above the other and joined or anchored together with the respective opposite form element by several of the anchor devices 13 in order to erect a longer and higher concrete wall form. As a departure from this, at least one anchor rod 14 can be led through exchangeable sleeves 16 received in the two 8752313_1 (GHMatters) P105167.AU 21 associated form elements 2 and 3 and be fastened on the outside of the form elements 2 and 3 by means of conventional lock nuts 54.

The described anchor device allows a secure bracing against large axial tensile forces, as well as the substantially smaller axial compressive forces which may be exerted by the two oppositely situated form elements as long as they are still filled with concrete.

The individual features of the invention disclosed in the specification and by means of the sample embodiment as well as in the figure can be combined in any given technically feasible arrangements and configurations with the subject matter of the invention in its general form.

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List of reference elements 1 concrete wall form 2 first form element 3 second form element 4 spar 5 cross brace 6 form sheet 7 opening 8 bearing sleeve 9 outer surface 10 outer surface 11 receiving opening 12 borehole 13 anchor device 14 anchor rod 15 anchor nut unit 16 exchangeable sleeve 17 base body 18 bearing flange 19 inner space 20 end wall 21 front end

8752313_1 (GHMatters) P105167.AU 23 22 opening 23 surface 24 spacing ring 25 annular gap 26 front portion 27 sealing ring 28 inner circumferential groove 29 intermediate space 30 shoulder 31 groove 32 anchor nut 33 internal thread 34 external thread 35 shoulder 36 bearing surface 37 rotation lock 38 anti-twist ring 39 internal profiling 40 external profiling 41 external hexagon profile 42 internal hexagon profile 43 securing ring 44 opening

8752313_1 (GHMatters) P105167.AU 24 45 indentation 46 web 47 longitudinal channel 48 front end 49 end wall 50 rear side 51 entry opening 52 exit opening 53 sheathing tube 54 lock nut 55 quick fastening device 56 spar walls 57 opening 58 opening 59 spar wall 60 locking web 61 guide slot 62 front end 63 rear end 64 bearing plate 65 opening 66 locking seat 67 lower edge

8752313_1 (GHMatters) P105167.AU 25 68 enlargement 69 lug 70 opening 71 radial slit 72 annular surface

8752313_1 (GHMatters) P105167.AU

Claims

Patent claims

1. Anchor device of a concrete wall form (1) with two oppositely situated form elements (2, 3), which can be connected and locked to each other by means of an anchor rod (14) of the anchor device (13) having an external thread, characterized in that the anchor device (13) comprises an anchor nut unit (15), which can be fitted on and fastened in the one form element (2), and an exchangeable sleeve (16), which is associated with the anchor nut unit (15) and which can be fitted on and fastened in the other form element (3), and a longitudinal channel (47) for receiving the anchor rod (14) in a locking-free manner, wherein the anchor rod (14) on the one hand can be screwed on the anchor nut unit (15) of the one form element (2) and on the other hand it can be locked by means of a closing unit (54) on the other form element (3), extending through the longitudinal channel (47) in the exchangeable sleeve (16), wherein each form element (2, 3) contains receiving openings (11) in which the anchor nut unit (15) or the exchangeable sleeve (16) can be optionally fitted and secured and the anchor nut unit (15) and the exchangeable sleeve (16) can be secured on the form elements (2, 3) or in the receiving openings (11) of the form elements (2, 3) by means of a quick fastening device (55).
2. Anchor device according to claim 1, characterized in that the receiving openings (11) or the bearing sleeves (8) forming the receiving openings (11) and arranged in the form element (2, 3) have the same diameter.
3. Anchor device according to claim 1 or 2, characterized in that each quick fastening device (55) is arranged exclusively inside the form element (2, 3).
4. Anchor device according to one of claims 1 to 3, characterized in that the anchor nut unit (15) comprises an interior anchor nut (32) which is secured against twisting, into which the anchor rod (14) can be screwed, and the anchor nut (32) is braced in the anchor nut unit (15) for transmittal of tensile and compressive force.
5. Anchor device according to one of claims 1 to 4, characterized in that the anchor nut unit (15) has a radially enlarged bearing flange (18) for the outside axial bracing against the form element (2).
6. Anchor device according to one of claims 1 to 5, characterized in that the quick fastening device (55) comprises a locking pin (56), which is movably mounted on the form element (2, 3) and can move between a position of rest with no locking engagement to the anchor nut unit (15) or the exchangeable sleeve (16) and a locking position in locking engagement with the anchor nut unit (15) or the exchangeable sleeve (16), the locking pin (56) being arranged especially in its locking position entirely inside the form element (2, 3).
7. Anchor device according to claim 6, characterized in that a locking web (60) of the locking pin (56) forms a force-transmitting locking connection between the bearing sleeve (8) and the inserted anchor nut unit (15) or exchangeable sleeve (16).
8. Anchor device according to one of claims 1 to 7, characterized in that a spacing ring (24) is fitted in a borehole (12) of the form sheet (6) which is concentric to the receiving opening (11) and surrounds a front-end portion (26; 49) of the inserted anchor nut unit (15) or exchangeable sleeve (16) in a tight manner.
9. Anchor device according to claim 8, characterized in that the spacing ring (24) has a seal (27) for sealing off the anchor nut unit (15) or exchangeable sleeve (16) and/or the spacing ring (24) and an associated front-end portion (26; 49) of the inserted anchor nut unit (15) or exchangeable sleeve (16) are formed with mutually adapted conical sealing surfaces.
10. Anchor device according to claim 8 or 9, characterized in that the spacing ring (24) is elastically mounted against the form sheet (6) and/or is radially expandable by a radial slit (71) for its adapting to an associated front-end portion (26; 49) of the inserted anchor nut unit (15) or exchangeable sleeve (16).
11. Form element (2, 3) of a concrete wall form (1) with a receiving opening (11) for an anchor rod (14) of an anchor device (13) according to one of claims 1 to 10, by means of which two of these form elements (2, 3) can be connected and locked to each other, wherein the receiving opening (11) or a bearing sleeve (8) forming the receiving opening (1) is provided for the optional installing of an anchor nut unit (15) or an exchangeable sleeve (16) and the respective anchor nut unit (15) or exchangeable sleeve (16) can be removably secured to the form element (2, 3) by means of a quick fastening device (55).
12. Form element according to claim 11, characterized in that the quick fastening device (55) comprises a locking pin (56), which is movably mounted on the form element (2, 3) and can move between a position of rest with no locking engagement to the anchor nut unit (15) or the exchangeable sleeve (16) and a locking position in locking engagement with the anchor nut unit (15) or the exchangeable sleeve (16).
13. Form element according to claim 11 or 12, characterized in that a spar (4) of the form element (2, 3) comprises a bearing sleeve (8) containing the receiving opening (11), the spar (4) receives the locking pin (56), especially in movable manner at two oppositely positioned openings (57, 58) of the spar (4), and the locking pin (56) or a locking web (60) of the locking pin (56) transmits a locking force substantially between the bearing sleeve (8) and the inserted anchor nut unit (15) or exchangeable sleeve (16).
14. Form element according to one of claims 11 to 13, characterized in that the quick fastening device (55) can be activated and is arranged solely inside the form element (2, 3).
15. Form element according to one of claims 11 to 14, characterized in that a spacing ring (24) is fitted in a borehole (12) of a form sheet (6) arranged on the form element (2, 3) and concentric to the receiving opening (11) and it surrounds a front-end portion of the inserted anchor nut unit (15) or exchangeable sleeve (16) in a tight manner.
16. Concrete wall form (1) with at least two form elements (2, 3) according to one of claims 11 to 15 as well as at least one anchor device according to one of claims 1 to 10.
17. Method for mounting an anchor device on two form elements (2, 3) of a concrete wall form (1) being anchored together and positioned opposite each other, characterized in that optionally Step la: an anchor nut unit (15) of an anchor device (13) according to one of claims 1 to 10 is fitted into a receiving opening (11) of the first form element (2) and axially secured therein, Step lb: an anchor rod (14) of the anchor device (13) is led through a receiving opening (11) in the second form element (3) in the direction of the anchor nut unit (15) of the first form element (2) and screwed together with it, Step lc: a sheathing tube (53) is shoved onto the anchor rod (14) and through the receiving opening (11) of the second form element (3), Step Id: an exchangeable sleeve (16) is placed on the anchor rod (14) and shoved into the receiving opening (11) in the second form element (3) and axially secured therein, and Step le: a closing unit (54) is arranged on the anchor rod (14) that sticks out from the exchangeable sleeve (16), or Step 2a: as a change from step la, instead of the anchor nut unit (15) an exchangeable sleeve (16) is introduced into the receiving opening (11) of the first form element (2) and axially secured therein, Step 2b: the anchor rod (14) is led through the receiving opening (11) in the second form element (3) in the direction of the exchangeable sleeve (16) of the first form element (2), Step 2c: the sheathing tube (53) is shoved onto the anchor rod (14) and through the receiving opening (11) of the second form element (3), Step 2d: an exchangeable sleeve (16) is placed on the anchor rod (14) and shoved into the receiving opening (11) in the second form element (3) and axially secured therein, and Step 2e: a closing unit (54) is arranged on the anchor rod (14) that sticks out from each of the two exchangeable sleeves (16).
18. Method according to claim 17, characterized in that when fitting on the closing unit, a lock nut (54) is screwed onto the anchor rod (14) and tightened against the respective form element (2, 3).