EP1889985A2 - 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. Added to this are the high transport and storage costs due to the bulky dimensions and, not least, after the shredding of the pipes, the disposal of the cut formwork as special waste.

Subject of the invention

The formwork according to the invention consists of a shell (1) and a multi-part closure (2), wherein the 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. However, the identical component can be used as the closure (2).
The jacket (1) consists of a bent to form tube sheet of a material thickness of preferably 1 mm, which is parallel to the axial direction of the tube extending joints (11) over a folding width of preferably 15 mm and the longitudinal angle at an angle of preferably 135 ° angled and depending rolled to diameter round.
The cross section of a jacket (1) formed in this way can be seen in FIG.
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 jacket (1) with each other to a rigid and sealed tube.

For this purpose, the joint clip (5) is inserted in the loose state via the folds (3) resting against one another in their edges (10). 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 pushed along the side in 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 opposite the folds (9). In order to obtain a flush inner surface of the jacket (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 folds (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 clamps (5), the wedge (6) engages in the previous or following adjacent clamps (5), so that always the longitudinal ends of the wedges (6) by a clamp (5 ) are covered.

This system according to the invention of shuttering casing (1) and closure (2) can be extended to any desired heights. In the case of a formwork extension, at the joint (11), where the lower casing (1) and the casing (1 ') touch the extension, a round sheet-metal strip (12) surrounding the lower shell (1) and the upper shell (1 ') all around, and at both ends of the base (16) are fastened, which are screwed to the two legs (8) and the sheet metal strip ( 12) to tension.

To ensure that the formwork when setting up a secure stand, a support bracket (14) is screwed at a corresponding height to the bracket (5), where in the holes provided (15), 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 jacket (1) is pushed laterally around the reinforcement around and the closure (2) or the juxtaposition of several closures from the side the jacket (1) mounted. Alternatively, the complete formwork with closure (2) can be mounted in the horizontal position and then slipped from above by crane over an existing reinforcement.
When stripping the fixing screws (7) and the locking screws (9) on the clip (5) are loosened, 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 the usual diameters and heights of formwork shells can be carried out with one and the same closure (2). In this case, 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 sheet metal to be rolled around to a casing (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, in addition to the connection of thin sheets for circular formwork, for hollow bodies of any kind, as well as for connections of sheets in a plane use.

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 Blechstreifens (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 sowie 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

Fig. 3

the cross section of the wedge (6)

Fig. 4

the cross section of the shell (1) and the folds (3)

Fig. 5

the cross section of the jacket (1) with closure (2) of the 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 jacket (1) and the jacket (1 ') with the metal strip (12) in the open state and the fastening tabs (17)

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 (9)

Column formwork, consisting of a jacket (1) and a multi-part closure (2), wherein a) the jacket has a straight-line and substantially perpendicular through opening, the edges (10) outwardly at approximately 135 ° angled folds (3) and have b) the closure (2) comprises the following items: - A multi-part, three-sided bracket (5), the movable legs (8) in symmetrical inside cross-section at 45 °, flattened outside and at the upper, horizontal intermediate connecting part (13) threaded holes (4) for the fixing screws ((7) and locking screws (9) are arranged, wherein the open bracket (5) and thus the two legs (8) are pressed together by the fixing screws (7), that touch the two edges (10) of the shell (1) and - A cross-sectionally three-sided isosceles wedge whose angle corresponds to the two Falzaußenkanten and of the locking screws (9) to the, both folds (3) of the shell (1) is pressed. - Fixing screws (7) which connect the multipiece clip (5) firmly together. Column formwork according to claim 1, characterized in that the legs (8) and folds (3) have an angle of approximately 45 ° in cross section symmetrical to the perpendicular bisector and the wedge (6) at its, the edges (10) facing the tip, an angle from 90 ° upwards. Column formwork according to claim 1 or 2, characterized in that a plurality of coats (1) are connected to one another lying one above the other, wherein the lower shell (1) and the jacket (1 ') of the extension touch the joint (11), and a round sheet metal strip (12), which surrounds the lower shell (1) and the upper shell (1 ') all around, and at both ends of the pedestal (16) are fastened, which are screwed to the legs (8) and the metal strip (12) Bring tension. Column formwork according to one of claims 1 to 3, characterized in that the wedge (6) engages in the previous or subsequent adjacent clamps (5). Column formwork according to one of claims 1 to 4, characterized in that the base of the jacket (1) deviates from a rectangular shape in such a way that the closed jacket (1) has a conical shape. A method for closing a column formwork according to claim 1, characterized in that a plurality of closures (2) are strung together, wherein the wedge (6) is covered at the connection points of a clip (5). Column formwork according to one of claims 1 to 3, characterized in that on the clamp (5) a support attachment (14) is screwed, which is provided for receiving the supports with holes (15). Column formwork according to one of claims 1 to 3, characterized in that on the lower shell (1) fastening tabs (17) with screw holes (15) are arranged for the bottom attachment. Column formwork according to claims 1 to 3, characterized in that for the production of steel, stainless steel, aluminum or another material is used:

Images