DE1813094A1 - Formwork for the production of precast concrete elements - Google Patents

Description

Formwork for the production of precast concrete elements The invention relates on a device for the production of each with two webs or ribs provided precast concrete elements, also called formwork, in which the formwork cross-section infinitely variable in the area of the ribs or webs that serve as reinforcement is.

The precast concrete elements produced in such formwork of a known type are called TT panels or trough panels and serve as a roof structure e.g. in factory halls or the like. such that an element is located directly on the longitudinal side of the other adjoins.

The formwork known for the production of such concrete ceiling elements consist essentially of one on a base plate or a base frame fixed core and two laterally and mirror images of the latter Formwork parts mounted displaceably transversely to its longitudinal axis. Due to the adjustability these side parts in the horizontal direction can be the strength of the ribs or webs to be changed.

The main disadvantage of these known types of formwork, however, lies in that when the rib or web width changes simultaneously the distance between the axes of gravity running through the latter changed, due to the one-sided cross-sectional displacement. This has the consequence that with every formwork only with a single rib thickness the requirement of the same field worlds of the overall system is reached, but when the rib thickness changes as a result of the one-sided displacement the center of gravity changes and in the overall system one of several prefabricated parts existing concrete ceiling fields of different widths occur; next to the optically undesirable appearance, the disadvantages of these blankets are essentially in the statically difficult ascertainability.

The present invention has therefore set itself the task of the to eliminate the disadvantages listed and to create a formwork that supports the production of concrete elements of different rib thicknesses with the same field width at the same time, based on the overall system.

For this purpose it is provided according to the invention that the formwork is made up of individual elements to form a common base plate guided parts, which have suitable movement elements are engaged with each other in such a way that the at least four transversely to their Shuttering parts displaceable along the longitudinal axis inevitably and the respectively adjacent ones are carried out in opposite directions.

This arrangement according to the invention ensures that when there is a change the cross-section in the area of the webs or Ribs the spacing of theirs x central or heavy axes due to the opposite extension or Narrowing the cross-section always remains the same. In a simple and meaningful way the disadvantages of the known formwork are thus eliminated.

Exemplary embodiments of the invention are shown in the drawings and described in more detail below.

The figures show: FIG. 1 the cross section of a formwork according to the invention for a TT profile, FIG. 2 shows a reduced side view of FIG. 1, FIG. 3 shows the cross section a formwork for trough profiles Fig. 4 an alternative version to Fig. 1 Fig. 5 a partial plan view of FIG. 4 and FIG. 6 a further alternative embodiment to Fig. 1.

The formwork shown in cross section in Fig. 1 for production of TT girders 1 consists of the four slidably mounted transversely to the longitudinal axis 2 of the profile Formwork parts 3,4,5,6, which rest on sliding plates 7,8,9,10, which in turn rest on a fixed base frame 11 or are connected to it. in the Area of the base frame 11 are the four Formwork parts 3,4,5,6 connected to one another via at least one common movement spindle 12, in such a way that that the thread 13 is alternately right-handed and left-handed, whereby when actuated the spindle 12 a forced and opposite adjustment of the formwork parts 3,4,5,6 he follows. This arrangement provides that of the present invention Task solved in a simple way, i.e. widening or reducing the Rib thickness 14 of the carrier 1, the distance 15 between the two axes of gravity 16 always remains constant. The height of the ribs is also simple in this embodiment changed by inserting different sheet metal strips 17 into the formwork. These sheets 17 can be supported by additional, more highly variable supports 18 be secured.

Fig. 2 shows the side view of a formwork described above. Here you can see that depending on the length of the formwork to adjust the parts 3,4,5,6 several movement spindles 12 are provided, their simultaneous running by a common rack 20 acting on the slot 19, e.g. by hydraulic cylinders 21 can be driven, is guaranteed.

When filling the formwork with concrete, the remaining central gap will be 26 between the parts 4 and 5 covered with a sheet 27, while the lateral Limitation of the shape by the continuous angle pieces 28 is formed.

The embodiment shown in Fig. 3 shows a formwork for production of trough plates 29. The shape here exists from the also opposing moving parts 22, 23, 24 and 25. These parts are driven as described for FIG. For every rib thickness 30, the center of gravity remains the same 31 constant.

In Fig. 4 and 5 it is shown that the compulsory and counter-rotating Sequence of movements when adjusting the formwork also via a lever linkage 32 can be done.

In the same way, any other mechanical, electrical, pneumatic or, as shown in FIG. 6, hydraulic adjusting device 33 can be used.

Claims (7)

P a t e n t a n s p r ü c h e 1. Formwork made of steel for the production of two tegen or ribs provided precast concrete elements, in which the formwork cross-section the stiffening is infinitely adjustable, so d u r g e k e n n n z e i c h Not that the formwork is made up of individual pieces on a common base plate There are parts that are connected to one another via suitable movement elements stand in such a way that when the cross section changes in the area of the webs or ribs the distance between their central axes remains unchanged. 2. Apparatus according to claim 1, d a d u r c h g e k e n n -; * i c h n t that the formwork can also be displaced at least four times across its longitudinal axis Formwork parts consists of which inevitably and which in each case during the adjustment neighboring ones are led in opposite directions. 3. Voxrichtung according to claims 1 and 2, d a d u r c h g e k e n n z e i c h n e t that the individual formwork parts on the slide-shaped Sit on the top of the common base plate and Adjusting elements arranged essentially within the base plate are. 4. Device according to claims 1-3, d a d u r c h g e k e n n z e i c h n e t that the adjusting device consists of several at a distance from one another and or lying to the formwork longitudinal axis, connected to the individual formwork parts There are threaded spindles, which are in motion connection via a common ten rod stand. 5. Device according to claims 1-3, d a d u r c h e e k e xi n z e i c h n e t, dah clic adjustment device can be operated hy raulically or by itself is a hydraulic system. t. Device according to claims 1-5, d a d u r c h g e k e xi It is noted that the advance device consists of a Hebsl linkage. 7. Device according to claims 1-6, d a d u r c h g e -k e n xi it is shown that the individual formwork parts can be placed on the base plate are arranged.