EP1889985B1 - Formwork and method for manufacturing concrete round columns - Google Patents

Abstract

The formwork has a casing (1) with a continuous opening running in a straight and perpendicular manner. A closure has a multi-part, three-sided clamp (5) with movable shanks (8), where the clamp and the two shanks are pressed together by fixing screws (7) such that two edges (10) of the casing contact one another. The closure has an equilateral wedge, where an angle of the wedge corresponds to outer edges of two notches (3). The wedge is pressed at the two notches of the casing by locking screws (9), where the fixing screws fixedly connect the clamp. An independent claim is also included for a method for closing a column formwork.

Description

The invention relates to a reusable formwork with a closure system for the production of concrete round columns of cylindrical or conical shape.

State of the art

The production of concrete round columns was done in the past with great effort using wooden formwork. The coat consisted of a variety of wooden slats, which were held together with circular wreaths to form a tube. Due to the vertical joints between the individual wooden slats, the deactivated column had an irregular surface with unavoidable concrete wash-outs. To achieve a smooth surface, such cast pillars had to be subsequently plastered or clad. Today mostly steel formworks are used, which are composed of semicircular formwork elements to a coat. To reach the required height, the elements are mounted perpendicular to each other at higher heights. These formworks have a relatively high weight and can only be set up with the help of a crane. Besides the horizontal bumps there are two vertical bumps. The formwork elements can be used only for a particular column diameter, whereby the cost of materials in the production of a series of different thickness columns is significantly increased. The disadvantages also include the resulting higher transport and storage costs, as well as the relatively high purchase price.

Another possibility, which is very common today, to produce round columns are so-called "cardboard formworks". The pipes are relatively light and can therefore be transported by hand. It is a disposable formwork, the use of which is sensible and economical for small quantities. For larger numbers and especially for large diameters, however, the use of these disposable formwork is a very expensive construction. In addition there are the high transport and storage costs due to the bulky dimensions and not least, according to the Crushing of the pipes, disposal of the cut formwork as special waste.

DE 20 2005 009924 U1 describes a column formwork with the features of the preamble of claim 1.

In the GB 938 939 A For example, a hollow structure with a closure is described wherein a flat metal plate is provided with a pair of opposing undercut flanges and retained by undercut guide members.

Subject of the invention

The formwork according to the invention consists of a shell 1 and a multi-part closure 2, wherein shell 1 and closure 2 are two separate components. However, the functionality of the closure results only by the structural design of the shell 1, wherein the closure 2 is used independently of the jacket diameter.

Thus, different coats 1 are required for different column diameters. As closure 2, however, in each case the identical component can be used.

The jacket 1 consists of a bent to the tube sheet of a material thickness of preferably 1 mm, whose parallel to the axial direction of the tube extending joints 11 over a folding width of preferably 15 mm and longitudinally angled at an angle of preferably 135 ° and rolled round depending on the diameter are.

The cross section of a shell 1 thus formed is in Fig. 4 recognizable. Thus, after folding the original joints, the resulting edges 10 become the actual joints 11 of the jacket 1.

The multi-part closure serves to releasably connect these angled folds 3 of the shell 1 with each other to a rigid and sealed tube.

For this purpose, the common clip 5 is inserted in the loose state on the lying in their edges 10 folds 3. This can be done from the side or from the top. Then the loose clip 5 is pressed together by means of the lateral fixing screws 7, so that the edges 10 of the jacket 1 press against each other. The wedge 6 is now on the long side pushed into the space provided and pressed with the locking screws 9 against the two-sided folds 3. This creates a positive and absolutely tight connection under high loads. The inserted wedge is additionally fixed relative to the jacket 1 or against the folds 9. In order to obtain a flush inner surface of the shell 1 in the region of the edges 10, the connecting part 13 of the clip 5 in the screwed-together state is mutually planar, so that the inner surface of the shell 1 is flush. As a result, a positive and pressed-fitting connection of the shell 1 is achieved and the seams 3 sealed against each other.

In the longitudinal direction of a jacket 1, such a closure unit described above can extend over the entire length of the jacket 1. Preferably, however, a plurality of shorter closure units are pushed one behind the other for reasons of handling. In order to produce a rigid connection in the longitudinal direction between the individual brackets 5, the wedge 6 engages in the previous or subsequent adjacent brackets 5, so that always the longitudinal ends of the wedges 6 are covered by a bracket 5.

This system according to the invention of shuttering casing 1 and closure 2 can be extended to any heights, In a formwork extension is at the shock 11, where the lower shell 1 and the shell 1 'contact the extension, a round sheet metal strip 12, the all around the lower shell. 1 and the upper shell 1 'surrounds, and at both ends of the base 16 are fixed, which are bolted to the two legs 8 and bring the metal strip 12 to tension.

In order to ensure the formwork when setting up a secure stand, a support bracket 14 is screwed at a corresponding height on the bracket 5, where in the holes 15 provided, the two oblique supports are screwed.

The construction of the formwork can be done in various ways: When building the formwork, on an already standing reinforcement, the shell 1 is pushed laterally around the armor around and the closure 2 or the juxtaposition of several closures from the side mounted on the shell 1 , Alternatively, the complete formwork with closure 2 are mounted in the horizontal state and then slipped from above by crane over an existing reinforcement.

When stripping the fixing screws 7 and the locking screws 9 are loosened on the bracket 5, so that the wedge 6 pulled out and the clip 5 can be removed laterally. The jacket is thus free and can be removed laterally from the finished column.

A particular advantage of the formwork over other systems is that with the use of this system of sheath 1 and multi-part closure 2, all common diameters and heights of formwork shells can be carried out with one and the same closure 2. The production of the shell 1 is possible without much effort, since only a rectangular sheet has to be cut, which is rolled to the intended diameter and provided on the longitudinal sides with suitable folds 3.

Another advantage that can be achieved with this formwork system is that not only cylindrical but also conical columns can be produced on the same principle. Only the base area of the fine sheet metal to be rolled around to a shell 1 has to be cut to size.

The general advantage of this formwork is the repeated use, the relatively low weight and the ease of installation. During transport and storage, the jacket plates can be pushed into each other in a confined space due to their flexibility and therefore take up little space.

The closure 2 can be used in addition to the connection of thin sheets for circular formwork, and for hollow bodies of any kind, as well as for connections of sheets in a plane.

Fig. 1 :

einen Querschnitt des Verschlusses 2 mit allen Einzelteilen

Fig. 2 :

den Querschnitt der Klammer 5 im geöffneten Zustand

Fig. 3 :

den Querschnitt des Keiles 6

Fig. 4 :

den Querschnitt des Mantels 1 und der Falze 3

Fig. 5 :

den Querschnitt des Mantels 1 mit Verschluss 2 des Blechstrei- fens 12 mit den beiden Sockeln 16

Fig. 6 :

den Querschnitt des Blechstreifens 12 im Bereich des Sockels (16)

Fig. 7 :

die Längsansicht der Stützenbefestigung 14 mit dazu gehörigem Schnitt A - B

Fig. 8 :

die perspektivische Darstellung des unteren Mantels 1 und dem Mantel 1' mit dem Blechstreifen 12 im geöffneten Zustand so- wie den Befestigungslaschen 17

This shows

Fig. 1:

a cross section of the closure 2 with all items

Fig. 2:

the cross section of the clip 5 in the open state

3:

the cross section of the wedge. 6

4:

the cross section of the shell 1 and the folds 3rd

Fig. 5:

the cross-section of the jacket 1 with closure 2 of the sheet metal strip 12 with the two sockets 16

Fig. 6:

the cross section of the metal strip 12 in the region of the base (16)

Fig. 7:

the longitudinal view of the support bracket 14 with associated section A - B

Fig. 8:

the perspective view of the lower shell 1 and the jacket 1 'with the metal strip 12 in the open state and the fastening tabs 17th

LIST OF REFERENCE NUMBERS

1 :

coat

1' :

Cloak of the extension

2:

shutter

3:

folds

4:

threaded holes

5:

clip

6:

wedge

7:

fixing screws

8th :

Legs of the bracket

9:

Locking screws

10:

edge

11:

shock

12:

metal strip

13:

connecting part

14:

support fixing

15:

screw holes

16:

base

17:

mounting tabs

Claims (8)

1. Column formwork comprising a casing (1) and a multipart closure (2), wherein the casing has a continuous aperture which is straight-lined and essentially vertical, characterized in that the edges (10) of the aperture comprise rebates (3) which are bent outwardly by approximately 135°, and the closure (2) comprises the following parts:

   - a multipart, three-lateral clip (5) with legs, connecting part, fixing screws and locking screws (9), wherein the movable legs (8) of the clip approach each other symmetrically inside the clip in a cross section under 45°, are flattened on an outer side and have threaded bores (4) for the fixing screws (7) at there upper horizontal connecting part (13) located between them, wherein the opened clip (5) and thus its two legs (8) are pressed together by the fixing screws (7) so that the two edges (10) of the casing (1) abut each other and

   - a wedge (6) being triangular equal-sided in a cross section, wherein the angle of the wedge corresponds to the angle of the two outer edges of the rebates and the wedge is pressed to the two rebates (3) of the casing (1) by the locking screws (9).
2. Column formwork according to claim 1, characterized in that the legs (8) and rebates (3) have an angle of approximately 45° in a cross section symmetrical to the perpendicular bisector of the side and in that the wedge (6) has an angle of 90° at its tip directed to the edges (10).
3. Column formwork according to claim 1 or 2, characterized in that a plurality of casings (1) are connected on top of each other, wherein the lower casing (1) and the casing (1') of the extension abut at the joint (11), and that a round metal strip (12) is provided, which is fixed by the fixing screws (7) and surrounds both casings and at which both ends bases (16) are fixed, which are screwed to the legs and apply tension to the metal strip (12).
4. Column formwork according to one of claims 1 to 3, characterized in that the wedge (6) reaches into the previous or subsequent attached clips (5).
5. Column formworks according to one of claims 1 to 4, characterized in that the surface area of the casing (1) deviates from a rectangluar form so that the closed casing (1) has a conical shape.
6. Method for locking a column formwork according to claim 1, characterized in that a plurality of closures (2) are stringed together, wherein the wedge (6) is covered at the junctions by a clip (5).
7. Column formwork according to one of claims 1 to 3, characterized in that a support attachment (14) comprising holes (15) for recepting the supports is screwed at the clip (5).
8. Column formwork according to one of claims 1 to 3, characterized in that mounting straps (17) with screw holes (15) for the soil attachment are arranged at the lower casing (1).

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