DE20302505U1 - Formwork, comprises interlocking L shaped and panel shaped shuttering sections - Google Patents

Abstract

The formwork (1) comprises a first shuttering section (2) with an L-shaped cross-section formed by a flat short arm (4) and a flat long arm (5), and a panel-shaped second shuttering section (3) with a hook part which hooks underneath and around the first section (sic).

Description

LOESENBECK · STRACKE · SPECKET" DANTZ

PATENT ATTORNEYS EUROPEAN PATENT AND TRADEMARK ATTORNEYS

Dr. Otto Loesenbeck (1931-1980) Dipl.-Ing. A. Stracke

Lothar 1 lletSChke Dipl.-Ing. K.-O. Loesenbeck

Südstraße 3 Dipl.-Phys. P. Specht

Dipl.-Ing. J. Dantz

32457 Porta Westfalica

Jöllenbecker Straße 164 D-33613 Bielefeld Telephone: +49(0521)98618-0 Fax: +49 (0521) 89 04 05 E-mail: mail@pa-loesenbeck.de 24733DE2/12 Internet: www.pa-loesenbeck.de

14 February 2003

Foundation formwork device

The invention relates to a foundation formwork device according to the preamble of claim 1.

Foundation formwork devices are known in a wide variety of designs.

There are efforts to use completely prefabricated foundation formwork devices. The disadvantages are not only the lack of geometric adaptability, but also the high price, the large transport volume and the relatively poor accessibility of the reinforcement at the installation site.

In addition to prefabricated systems, plug-in formwork made of brackets and wall parts is also known. These are significantly more flexible than prefabricated elements, particularly in terms of shape, as they are only assembled at the installation site according to the conditions of the respective construction site. They usually have separate bottom and side parts, which are connected via brackets or - less advantageously

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- Plug-in claws hold the individual elements together. However, with particularly large dimensions, these systems may be at some risk of tipping over.

Formwork devices are also known from the prior art which have two L-shaped formwork parts which are positioned opposite one another. According to the invention, these systems therefore do not adequately absorb the tensile forces resulting from the concrete pressure without additional, complex measures.

It is therefore the object of the invention to create a formwork device which is based on the system of plug-in formwork, thus retaining its advantages as far as possible, but which is nevertheless sufficiently stable even with larger dimensions.

The invention solves this problem by the subject matter of claim 1.

According to this, the first formwork part has an L-shaped cross section with a flat base leg and a flat longitudinal leg and preferably at least the longitudinal leg is partially or completely provided with a flat cover. The second formwork part is plate-shaped and preferably also partially or completely provided with a flat cover and the ψ second formwork part engages behind an angle-shaped hook section on the first formwork part.

Due to the angular design of the first formwork part, the formwork device is very stable and has little risk of tipping over. The installation of the reinforcement is particularly simple and flexible in the manner of a plug-in formwork system, since despite the stability of the first formwork part, full accessibility to the reinforcement at the installation site is maintained from the open side of the angular formwork part.
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LOESENBECK. · STRACKE · SPECHT · DANTZ - PATtNt^WALtE -!EURi)I ⁵ EAiS &Rgr;&Agr;&Idigr;&Egr;&Ngr;&Eacgr; AND TRADEMARK ATTORNEYS

Registration text dated 14.02.2003 Page 3

The second formwork part is only added after the reinforcement has been installed. The angled hook section creates the force connection between the first and second formwork parts in a simple way. The base leg with the hook-shaped section effectively absorbs the tensile forces resulting from the concrete pressure and creates the necessary connection to the second formwork part without additional fastening means. If desired, the second formwork part can optionally be tied to the first formwork part. However, tying is not absolutely necessary in many applications.

Preferably, the dimensions of the second formwork part correspond to the dimensions of the longitudinal leg of the first formwork part.

It is practical to have the hook section bent vertically from the base leg parallel to the longitudinal leg in the direction of the longitudinal leg of the first formwork part or upwards in the normal installation position. With this design, the second formwork part only needs to be pushed behind the hook section after the reinforcement has been formed.

It is particularly preferred that the two formwork parts - particularly when building higher reinforcements - are connected to one another using at least one or more tie rods. The tie rods are inexpensive to manufacture and easy to install and ensure the necessary stability of the formwork device, particularly in the area facing away from the base leg. Optionally, the two formwork parts can be additionally connected to one another in their middle area using the tie rods, for example if the longitudinal legs are very long.

Installation is easy if the tension anchors pass through slots in the formwork parts, which are, for example, punched into them.

LOESENBECK · STRACKE · SPECHT · DANTZ - PATEN ^- UuIWALtE -tUROT'EAfJ PATEN'S AND TRADEMARK ATTORNEYS

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It is also worth mentioning that the system is easy to stack due to the simple geometry of the components used. This results in the additional advantage of a low freight volume.

Also worth mentioning is the simple design of the individual elements, which results in low manufacturing costs. Expensive special tools are not required to produce these elements.

Advantageous embodiments can be found in the subclaims.

The invention is described in more detail below with reference to the drawing. It shows:

Fig. 1 is a side view of a first and a second formwork part;

Fig.2a-d four consecutive steps in the assembly of the formwork; Fig. 3 an installation of a formwork device with additional ground anchor;

Fig. 4 an installation of a formwork device with additional cleanliness

layer; and

Fig. 5a,b an additional stiffening of a formwork device by means of tension anchors.
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Fig. 1 shows a foundation formwork device 1, which has a first formwork part 2 and a second formwork part 3.

The first formwork part 2 has an L-shaped cross-section with a flat base leg 4 and a flat longitudinal leg 5. Like the second formwork part 3, it preferably consists of an inexpensive, bent round steel mesh mat 6, the base leg 4 being designed in relation to the longitudinal leg 5 in such a way that the first formwork part 2 stands automatically on a base such as a concrete foundation. Even before installation, the formwork parts 2, 3 can be covered in parts or completely with the flat cover 15 made of sheet metal, plastic or cardboard.

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Registration text dated 14.02.2003 Page 5

A hook section 7 protrudes from the free end of the base leg 4 facing away from the longitudinal leg 5, which is bent upwards vertically from the base leg 4 parallel to the longitudinal leg 5. The hook section 7 serves to fasten the second formwork part 3 to the first formwork part 2.

The second formwork part 3 is designed as a flat plate, the dimension of which essentially corresponds to the dimensioning of the longitudinal leg 5 of the first formwork part 2.

The installation of this arrangement is carried out as follows.

First, the first formwork part 2 is set up at the installation site or at the concreting site (Fig. 2a). Even before installation, the formwork parts 2, 3 can be covered with the flat cover 15 made of sheet metal, plastic or cardboard in a cost-effective and simple manner.

The reinforcement 8 is then installed. It is advantageous that the installation area for the reinforcement 8 on the side of the first formwork part 2 opposite the longitudinal leg 5 remains particularly easily accessible and thus installation is particularly unproblematic (Fig. 2b). Spacers made of plastic or concrete, which are known per se from the state of the art (not shown here), can be used between the reinforcement 8 and the formwork walls or the walls of the two formwork parts.

The second formwork part 3 is then attached to the hook section 7 at the installation site - preferably on its side facing the longitudinal leg - from the inside (Fig. 2c) and optionally fastened using tie wire (not shown).

The two formwork parts are then connected in the area facing away from the base leg 4 by means of an upper tie rod 9 (metal rod or round iron with

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Registration text from 14.02.2003 Page

two hooks), which further stabilizes the arrangement (Fig. 2d).

Variants are shown in Fig. 3-5.
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According to Fig. 3, it is intended to fix the base leg 4 by means of a ground anchor 10, which here has a hook 11 that is hooked onto the base leg and penetrates the base leg 4.

Fig. 4, however, shows the variant of a fixation by applying a blind layer 12, e.g. made of concrete, on the base leg 4. Then steps 2b to 2d of the assembly can follow.

In the case of relatively large formwork devices with long longitudinal legs 5, the first and second formwork parts 2, 3 can be connected to one another by additional tie rods 13 (round irons with right-angled hooks here), which are placed in addition to the upper tie rod 9 through pre-punched slots, for example in the middle area of the longitudinal leg 5 and the second formwork part 3. Finally, the tie rods 13 are anchored to the longitudinal irons 14 (Fig. 5a, b). 20

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Registration text from 14.02.2003

Reference symbol Foundation formwork 1 first formwork part 2 second formwork part 3 Base leg 4 Longitudinal leg 5 Round steel mesh mat 6 Hook section 7 Reinforcement 8th Tie rod 9 Ground anchor 10 Hook 11 Subsurface layer 12 Tie rod 13 Longitudinal iron 14 cover 15

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Claims (13)

1. Formwork device with a first formwork part ( 2 ) and a second formwork part ( 3 ) to be arranged on the first formwork part ( 2 ), characterized in that a) the first formwork part ( 2 ) has an L-shaped cross-section with a flat base leg ( 4 ) and a flat longitudinal leg ( 5 ), b) the second formwork part is plate-shaped, c) the second formwork part ( 3 ) engages behind an angle-shaped hook section ( 7 ) on the first formwork part ( 2 ). 2. Formwork device according to one of the preceding claims, characterized in that the second formwork part ( 3 ) is plate-shaped and corresponds in terms of its dimensions to the dimensions of the longitudinal leg ( 5 ) of the first formwork part ( 2 ). 3. Formwork device according to one of the preceding claims, characterized in that the hook section ( 7 ) is bent upwards perpendicularly from the base leg ( 4 ) parallel to the longitudinal leg ( 5 ). 4. Formwork device according to one of the preceding claims, characterized in that at least the longitudinal leg ( 5 ) of the first formwork part ( 2 ) is partially or completely provided with a flat cover ( 15 ). 5. Formwork device according to one of the preceding claims, characterized in that the second formwork part ( 3 ) is partially or completely provided with a flat cover ( 15 ). 6. Formwork device according to one of the preceding claims, characterized in that the two formwork parts ( 2 , 3 ) are connected to one another by means of at least one or more tension anchors ( 8 , 13 ). 7. Formwork device according to one of the preceding claims, characterized in that the two formwork parts ( 2 , 3 ) are connected to one another in their region facing away from the base leg ( 4 ) by means of the tension anchors ( 8 ). 8. Formwork device according to one of the preceding claims, characterized in that the two formwork parts ( 2 , 3 ) are connected to one another in their middle region by means of the tension anchors ( 8 ). 9. Formwork device according to one of the preceding claims, characterized in that the tension anchors ( 13 ) penetrate slots in the formwork parts ( 2 , 3 ). 10. Formwork device according to one of the preceding claims, characterized in that a ground anchor ( 10 ) passes through the base leg ( 4 ) of the first formwork part ( 2 ). 11. Formwork device according to one of the preceding claims, characterized in that a blind layer ( 12 ) is applied to the base leg ( 4 ). 12. Formwork device according to one of the preceding claims, characterized in that the cover ( 15 ) consists of sheet metal, plastic or cardboard. 13. Formwork device according to one of the preceding claims, characterized in that the first and/or the second formwork part ( 2 , 3 ) consist of a round steel fabric mat ( 6 ) to which the cover ( 15 ) is applied.