EP4004306A1

EP4004306A1 - Formwork tie

Info

Publication number: EP4004306A1
Application number: EP19752642.9A
Authority: EP
Inventors: Rick SCHILLE; Uwe Schramm; Gerhard Dingler
Original assignee: Meva Schalungs Systeme GmbH
Current assignee: Meva Schalungs Systeme GmbH
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2022-06-01
Also published as: US20220259872A1; WO2021018325A1; CA3143796A1

Abstract

According to the invention, a tie bar (2) of a formwork tie (1) for connecting two formwork elements, which are arranged opposite each other at a distance therebetween and which have two opposing flat portions (11), and a tie nut (3) are provided with a radial fixing screw (16) which can be screwed selectively against one of the two flat portions (11) in order to fix the tie nut (3) on the tie bar (2), as a result of which the distance between the two formwork elements can be adjusted in steps of half a pitch of an external thread (5) of the tie bar (2).

Description

Formwork anchor

description

The invention relates to a formwork anchor for connecting two formwork elements arranged at a distance from one another, having the features of the preamble of claim 1. Concrete formwork elements or formwork elements for short are used for concreting walls. For this purpose, formwork elements are arranged opposite one another with a normally constant spacing that corresponds to the thickness of the wall to be concreted. The formwork elements typically have a plate made of (plywood) wood or plastic as the formwork skin and a flat frame made of longitudinal and transverse rectangular steel or aluminum tubes

Stiffening on a back of the formwork facing. For concreting, the formwork elements are arranged with their formwork skins facing one another at a distance from one another. In order to keep the formwork elements flowing between them against a pressure, they are connected with formwork anchors which have anchor rods with threads at both ends, which are inserted through holes in the formwork elements arranged opposite one another and anchor nuts on each other on their threads remote backs of the formwork elements are screwed, which the formwork elements keep elements at a distance from each other. As an example, reference is made to a formwork anchor which is known from the patent application DE 10 2010 002 108 A1.

The object of the invention is to propose a sheathing anchor which can also be used for push-through installation with access to a concrete wall formwork from only one side and which enables simple adjustment of the spacing of the formwork elements.

This object is achieved by the features of claim 1. The formwork anchor according to the invention has an anchor rod with an external thread and an anchor nut which can be or is screwed onto the external thread. The external thread preferably extends from one end over a length which enables the spacing of the formwork elements to be set in a predetermined wall thickness range. The external thread can begin at the end of the anchor rod or it has a distance of, for example, one to three diameters of the anchor rod from the end of the anchor rod.

At an opposite end, the tie rod can also have an external thread for screwing on a further tie nut or some other device for securing it to a formwork element.

The anchor nut has a through hole through which the anchor rod passes and a first internal thread for screwing onto the external thread of the anchor rod.

The anchor rod according to the invention has a flattening at a peripheral point which extends in a longitudinal direction of the anchor rod. The flat preferably extends along the external thread of the anchor rod over the entire length, part of the length or more than the length of the external thread. The flat preferably extends axially parallel along the anchor rod, but it can also be offset in one Have circumferential direction, both run in a helical, wavy or zigzag shape, for example. The flattening can be continuous or interrupted in the longitudinal direction of the anchor rod, so that it is composed of individual individual flats arranged one behind the other in the longitudinal direction of the anchor rod. The flattening is preferably a flat surface in a chord plane of the anchor rod. For example, it is also possible to have a hollow, round or angular depression at one point on the circumference of the anchor rod as a flat.

The anchor nut has a locking element which interacts with the flattened area of the anchor rod. The locking element can be adjusted transversely to the flattened area of the anchor rod and can thereby be acted upon against the flat area, so that the locking element holds the anchor nut on the anchor rod in a rotationally fixed and thus axially fixed manner. To rotate the anchor nut on the anchor rod, the locking element must be lifted from the flat. “Transverse” means in particular that the locking element can be adjusted in the radial direction to the anchor rod and / or to the anchor nut or perpendicular to the flat. For this purpose, the anchor nut must be turned on the anchor rod in such a way that the locking element can be adjusted in the direction of the flattened area of the anchor rod, that is, so that the adjustment direction of the locking element runs in the direction of the flattened area of the anchor rod. Another direction of adjustment of the locking element is possible, provided that the locking element can be acted upon against the flattening of the anchor rod in such a way that it secures the anchor nut in a rotationally fixed manner or at least against the anchor nut from turning back on the anchor rod in the direction of the end of the anchor rod.

The invention enables the anchor nut to be fixed on the anchor rod in preferred positions in which the anchor nut is rotated by one or more full revolutions and is consequently offset by one or more turns of the external thread of the anchor rod on the anchor rod. This enables the distance between two formwork elements arranged opposite one another to be set in steps which correspond to a pitch of the external thread of the anchor rod. If the flattening of the anchor rod does not run in the axially parallel direction of the anchor rod, but rather has an offset in the circumferential direction in the longitudinal direction of the anchor rod, the preferred positions of the anchor nut are corresponding the offset in the circumferential direction by more or less than one or more full turns and consequently in the longitudinal direction by more or less than the turns of the external thread of the anchor rod offset from one another.

For a finer subdivision of the rotational positions in which the anchor nut with the fixed part element can be locked on the anchor rod in a rotationally fixed manner than a full turn, an embodiment of the invention provides several flattened areas on the anchor rod, which are preferably evenly distributed over the circumference of the anchor rod. are arranged, which, however, can also be arranged distributed unevenly over the circumference of the anchor rod.

The anchor rod preferably has two flattened areas opposite each other, i.e. offset by 180 ° in the circumferential direction on the anchor rod, if more than one flat area is provided, so that the anchor nut can be locked on the anchor rod after half a turn with the locking element.

The flattening can be provided in the area of the external thread and / or outside the area of the external thread on the anchor rod. In the area of the external thread, the flattened area is, in particular, a circular segment-shaped recess on the external circumference of the thread of the external thread of the anchor rod. The recesses can be less than or equal to the depth of the thread. In this case, the flattened area of the anchor rod is composed of individual flattened areas on the turns of the external thread, which are or are interrupted between the turns. The recesses can also be deeper than the thread pitch of the external thread of the anchor rod is high. In this case, the flat runs without interruption in the longitudinal direction of the anchor rod.

The locking element can be, for example, a spring-loaded bolt or the like that is spring-loaded in the anchor nut or in the direction of the flattening of the anchor rod. Further possibilities are a wedge or an eccentric element as a locking element, which is slidably or pivotably guided or mounted on or in the anchor nut and which can be acted upon against the flattened area of the anchor rod, so that he or it the anchor nut non-rotatably on the anchor rod. One embodiment of the invention provides a screw element, for example a screw or a bolt with a thread, which can be screwed or screwed into a second internal thread of the anchor nut. The second internal thread or a hole in the anchor nut with the second internal thread opens into the through hole of the anchor nut, which has the first internal thread, so that in a rotational position of the anchor nut on the external thread of the anchor rod, the locking element can be screwed against the flat portion of the anchor rod and onto it In this way, the anchor nut holds the anchor nut in a rotationally fixed manner on the anchor rod, in particular the second internal thread runs radially or diagonally in an axial plane of the anchor nut.

In a preferred embodiment of the invention, the external thread of the anchor rod has a pitch of 10 millimeters, that is, with one revolution the anchor nut moves 10 millimeters in the longitudinal direction on the anchor rod. This enables the anchor nut to be fixed with the locking element in 10 millimeter steps in the longitudinal direction of the anchor rod and thus an adjustment of the distance between the formwork elements arranged opposite one another and connected to the form anchor also in 10 millimeter steps.

One embodiment of the invention provides distance markings for the distance between the formwork elements set with the anchor nut. This can be numerical data or other markings that are attached to the tie rod in such a way that the distance set with the tie nut can be read off. If the flattened area is designed as recesses in the thread turn of the external thread of the anchor rod, the spacing markings can be attached, for example, to the individual flattened areas or to the recesses of the thread turn.

A further development or another embodiment of the invention provides a distance range specification for the distance between the formwork elements that can be set with the formwork anchor, ie an indication of the smallest and greatest distance between the formwork elements that is possible with the formwork anchor. In order to be able to pull the anchor rod out of the set concrete after concreting without having to encase the anchor rod in the concrete, for example with a lost pipe, that is to say in the concrete, one embodiment of the invention provides an anchor rod Has smooth-walled and conical rod section. One end of the smooth-walled, conical rod section with a larger diameter faces the external thread with the screw-on or screwed-on anchor nut. When the formwork anchor according to the invention connects two formwork elements arranged at a distance from one another as provided, the smooth-walled, conical rod section of the anchor rod is located between the formwork elements or between their formwork skins. The smooth-walled, conical rod section of the anchor rod can extend into the formwork elements.

In a preferred embodiment of the invention, the formwork anchor has an abutment for supporting a formwork element on its rear side. The rear side is the side of the shuttering element facing away from a shuttering element arranged at a distance. The abutment holds the formwork element against an increase in its distance from the oppositely arranged formwork element beyond a set distance. It is possible to hold the formwork elements against a reduction in their spacing from one another, but not mandatory for the invention. The abutment is supported on the anchor nut in the manner of a ball joint around a pivot point or in the manner of a cardan joint around two mutually intersecting pivot axes, pivotable in all directions, whereby the support of the abutment on the anchor nut does not have to have a ball joint, universal joint or other joint. As a result of the pivotability, the abutment aligns itself with the formwork element when the anchor rod is inclined to the formwork element.

All the features mentioned in the description and / or shown in the drawing can be implemented individually or in any combination in embodiments of the invention. Embodiments of the invention which do not have all but only some of the features of a claim, including the independent claim, are possible. The invention is explained in more detail below with reference to an exemplary embodiment shown in the drawing. Show it:

FIG. 1 shows a formwork anchor according to the invention in a perspective illustration; FIG. 2 shows a side view of the formwork anchor from FIG. 1;

FIG. 3 shows a side view of the formwork anchor from FIG. 1 in a representation rotated by 90 ° with respect to FIG. 2;

FIG. 4 shows an enlarged illustration of a detail according to circle IV in FIG. 2;

FIG. 5 shows an enlarged illustration of a detail according to circle V in FIG. 2; FIG. 6 shows an anchor rod of the formwork anchor from FIG. 1 in a side view with the same viewing direction as in FIG. 2;

FIG. 7 shows the tie rod of the form tie from FIG. 1 in a side view with the same viewing direction as in FIG. 3;

FIG. 8 shows an anchor nut with an abutment of the formwork anchor from FIG. 1 in an end view; and

FIG. 9 shows the anchor nut with the abutment of the formwork anchor from FIG. 1 in axial section.

The formwork anchor 1 according to the invention shown in FIGS. 1 to 3 is provided for connecting two formwork elements, not shown, arranged opposite one another at a distance from one another. The formwork elements have a sheet of plywood or plastic as the formwork skin and a frame made of longitudinal and transverse rectangular tubes made of steel or aluminum on a rear side of the formwork skin to stiffen the formwork skin. The back is the side of the formlining on which the frame is arranged. The two formwork elements are set up with their formwork skins facing each other.

The formwork anchor 1 has a tie rod 2, which is shown in FIGS. 6 and 7, and an anchor nut 3 with an abutment 4, which is shown in FIGS. 8 and 9.

The anchor rod 2 has two external threads 5, 6, between which a smooth-walled, conical rod section 7 is located. The anchor nut 3, which has an axial through hole 8 with a first internal thread 9 for this purpose, can be screwed or screwed onto the external thread 5 at an end of the conical rod section 7 with a larger diameter.

Windings of a thread turn 10 of the external thread 5 at the larger-diameter end of the conical rod section 7 of the anchor rod 2 have circular segment-shaped recesses on opposite circumferential locations of the external thread 5 or of the anchor rod 2 on all windings, i.e. over a length of the external thread 5. As a result, flat surfaces are formed on the outer circumferences of the turns of the thread turn 10 in two chordal surfaces of the anchor rod 2 parallel to one another and parallel to an axial plane of the anchor rod 2 at the opposite circumferential positions of the external thread 5 or of the anchor rod 2. These flat surfaces form flattened areas 11 of the anchor rod 2 on the opposite circumferential locations of the anchor rod 2, which extend over the length of the external thread 5. The recesses of the turns of the thread turn 10, which form the flats 2, are as deep as the thread 10 is high in the exemplary embodiment, so that the two flats 11 are interrupted at the opposite circumferential positions of the anchor rod 2 between the turns of the thread 10.

The anchor nut 3 is a wing nut with two radially protruding wings 12 for a rotary drive by hammer blows. Coaxially in a middle between the wings As a rule 12, the anchor nut 3 additionally has a hexagon 13 for a rotary drive with a wrench or the like. Other nuts than a wing nut are possible.

Radial to the through hole 8 with the first internal thread 9, the anchor nut 3 has a radial hole 14 with a second internal thread 15 which opens into the through hole 8. A screw is screwed into the second internal thread 15 as a locking screw 16, which can be screwed from the outside against one of the two opposite flattened areas 11 on the external thread 5 of the anchor rod 2 so that its inner end facing the anchor rod 2 against the ab - Flattening 11 abuts and holds the anchor nut 3 on the anchor rod 2 in a rotationally fixed manner. A prerequisite is that the anchor nut 3 has previously been rotated into a position on the external thread 5 in which the radial hole 14 is aligned with one of the two flats 11 of the anchor rod 2 that the locking screw 16 against a of the two flats 1 1 abuts. If the locking screw 16 does not strike perpendicularly against the flat 11 from the start, it aligns itself perpendicular to the flat 11, rotating the anchor nut 3 somewhat on the external thread 5 of the anchor rod 2.

The locking screw 16 can generally also be understood as a locking element. In the exemplary embodiment, the locking screw 16 is an eyelet screw, but other screws or other fixed part elements than a locking screw 16 are also possible, for example a bolt-shaped locking element which, for example, is spring-loaded from the outside against the flat 11 of the anchor rod 2, around the anchor nut 3 in a rotationally fixed manner to hold on the tie rod 2. The list is exemplary and not exhaustive.

With the locking screw 16, the anchor nut 3 can be locked after every half turn on the anchor rod 2 by screwing the locking screw 16 against one of the two opposite flattened areas 11 of the anchor rod 2. This enables the anchor nut 3 to be fixed on the anchor rod 2 in steps with half a pitch of the external thread 5. As a result, the formwork anchor 1 according to the invention enables the distance to be adjusted of the two formwork elements arranged opposite one another in steps which correspond to half the pitch of the external thread 5 of the anchor rod 2.

In the exemplary embodiment, the external thread 5 of the anchor rod 2 has a pitch of 10 millimeters, so that the anchor nut 3 and thus the distance between the two formwork elements can be adjusted in steps of 5 millimeters.

As can be seen in FIG. 4, numbers are attached in the flat surfaces on the circumference of the turns of the thread turn 10 of the external thread 5 on one side of the anchor rod, which indicate the distance between the two formwork elements set with the anchor nut 3, i.e. a clearance the formwork skins of the formwork elements. This distance corresponds to a wall thickness of the wall to be concreted with the formwork elements. The numbers in the flat surfaces of one of the two flats 11 indicate the distance in millimeters in the exemplary embodiment and can generally also be understood as distance markings 17.

For turning, the anchor rod 2 has a hexagon on an end of the external thread 5 facing away from the smooth-walled, conical rod section 7, the corner dimension of which is smaller than a core diameter of the external thread 5, so that the anchor nut 3 can be screwed on. As can be seen in FIG. 5, a numerical range indication is attached to the hexagon, which indicates a smallest and a largest distance between the formwork skins that can be set with the formwork anchor 1. The number range information can generally also be understood as distance range information 18.

The anchor nut 3 has a spherical section 19 which is coaxial with the through hole 8 with the first internal thread 9 and which is received in a hollow spherical receptacle 20 of the abutment 4 of the formwork anchor 1. The spherical section 19 in the hollow spherical receptacle 20 forms a ball joint with which the abutment 4 in all directions around a center point of the spherical section 19 as a pivot point with respect to the anchor nut 3 and relative to the anchor rod 2 is pivotable. As a result, the abutment 4 aligns itself on a formwork element when the anchor rod 2 runs obliquely to the formwork element.

The abutment 4 has the shape of a plate from which a collar 21 protrudes which contains the hollow spherical receptacle 20. A breakthrough continues from the hollow spherical receptacle 20 through the plate of the abutment 4, through which the anchor rod 2 passes.

At a radial distance from the collar 21, the plate of the abutment 4 has an elongated hole which is radial to the collar 21 and in which a fastening screw 22 is received perpendicular to the plate of the abutment 4, which is displaceable in the elongated hole so that you The distance from the collar 21 and thus from the anchor nut 3 is adjustable. With the fastening screw 22, the abutment 4 can be fixed to an internal thread of the frame of the formwork element.

To connect the two formwork elements, not shown, which are arranged at a distance from one another, the anchor rod 2 is pushed through a through hole in one of the two formwork elements until the abutment 4 rests on the rear of the formwork element, where the abutment 4 with the fastening screw 22 can be set. Before or after the anchor rod 2 is pushed through the hole in the formwork element, the distance between the two formwork elements can be adjusted by turning the anchor nut 3 on the anchor rod 2 or by turning the anchor rod 2 in the anchor nut 3. To turn the anchor nut 3 or the anchor rod 2, the locking screw 16 must be screwed radially outward so far that the anchor nut 3 can be rotated on the external thread 5 of the anchor rod 2. When the distance is set, the locking screw 16 is turned inward so that it strikes one of the two flat areas 11 and holds the anchor nut 3 in a rotationally fixed manner on the anchor rod 2 and thus determines the set distance between the two formwork elements. The anchor rod 2 is also inserted through a hole in the oppositely arranged formwork element, on the back of which, for example, a nut is arranged, into which the external thread 6 is screwed on the smaller-diameter side of the smooth-walled, conical rod section 7 of the anchor rod 2, so that the both formwork elements are connected. By turning the anchor nut 3 on the anchor rod 2, the distance between the two formwork elements can be adjusted.

It is also possible to screw the nut on the back of the other formwork element after inserting the anchor rod 2 onto the external thread 6, provided that the back of the other formwork element is accessible.

Because of the smooth-walled, conical rod section 7, the anchor rod 2 can be pulled out of the concrete or unscrewed after the concrete has set.

Claims

1. Formwork anchor for connecting two formwork elements arranged opposite one another at a distance from one another, with an anchor rod (2) which has an external thread (5), and with an anchor nut (3) which has a through hole (8) has a first internal thread (9) with which the anchor nut (3) is screwed onto the external thread (5) of the anchor rod (2), characterized in that the anchor rod (2) extends in a longitudinal direction of the anchor rod (2) extending flat (11) at a circumferential point and the anchor nut (3) has a locking element (16) which is adjustable transversely to the flat (1 1) of the anchor rod (2) and can be acted upon against the flat (11), such that the locking element (16) holds the anchor nut (3) in a rotationally fixed manner on the external thread (5) of the anchor rod (2).

2. Formwork anchor according to claim 1, characterized in that the anchor rod (2) has a plurality of flattened areas (11) which extend in the longitudinal direction of the anchor rod (2) and are arranged distributed over a circumference of the anchor rod (2).

3. Formwork anchor according to claim 2, characterized in that the anchor rod (2) has two flattened areas (11) which extend in the longitudinal direction of the anchor rod (2) and which are arranged opposite one another on the anchor rod (2).

4. Formwork anchor according to one or more of claims 1 to 3, characterized in that turns of a thread turn (10) of the external thread (5) of the anchor rod (2) have flats (1 1) on their outer circumference, against which the locking element ( 16) can be acted upon in order to hold the anchor nut (3) non-rotatably on the external thread (5) of the anchor rod (2).

5. Formwork anchor according to one or more of the preceding claims, characterized in that the locking element (16) is a screw element and that the anchor nut (3) has a second internal thread (15) into which the locking element (16) is screwed and which opens into the through hole (8) of the anchor nut (3), so that in a rotational position of the anchor nut (3) on the external thread (5) of the anchor rod (2) the locking element (16) against the flat (11) of the anchor rod (2) can be screwed so that the fixed part element (16) holds the anchor nut (3) on the anchor rod (2) in a rotationally fixed manner.

6. Formwork anchor according to claim 5, characterized in that the second internal thread (15) extends radially to the through hole (8) with the first internal thread (9) of the anchor nut (3).

7. Formwork anchor according to one or more of the preceding claims, characterized in that the external thread (5) of the anchor rod (2) has a pitch of 10 mm.

8. Formwork anchor according to one or more of the preceding claims, characterized in that the anchor rod (2) spacing markings (17) for the spacing of the formwork elements set with the anchor nut (3) and / or a distance range indication (18) for one with the formwork anchor (1) having adjustable spacing of the formwork elements.

9. Formwork anchor according to claim 4 and 8, characterized in that the spacing markings (17) are arranged on the flats (11) of the thread (10).

10. Formwork anchor according to one or more of the preceding claims, characterized in that the anchor rod (2) has a smooth-walled and conical rod section (7), the larger-diameter end of which faces the external thread (5) of the anchor rod (2).

11. Formwork anchor according to one or more of the preceding claims, characterized in that the formwork anchor (1) has an abutment (4) for a rear side of the one formwork element facing away from the other formwork element, which can be pivoted in all directions the anchor nut (3) is supported.