DE202018106169U1 - Device for stabilizing the front sides of precast concrete elements - Google Patents

Abstract

Device for stabilizing the front sides of precast concrete elements, in particular the threshold heads of sleepers, which are manufactured in immediate shuttering and provided with a tension reinforcement after curing, wherein the respective molding box on at least one of its end faces an opening for temporarily receiving a die having a cavity in Prefabricated prefabricated part, characterized in that a in the cavity in the precast concrete insert and after curing removable mold part (1) is formed whose three-dimensional contour and shape is complementary at least the front end of the matrix created in the precast concrete cavity cavity and this cavity area, supporting the concrete in the curing process fills.

Description

The invention relates to a device for stabilizing the front sides of precast concrete elements, in particular the threshold heads of sleepers, which are manufactured in immediate shuttering and provided with a tension reinforcement after curing, wherein the respective molding box has at least one of its end faces an opening for receiving a die, which a cavity in the precast concrete part, according to the preamble of claim 1.

The production of prestressed concrete sleepers as precast concrete elements with subsequent composite, in which a two crosswise laid hairpin-shaped prestressing rods existing prestressing steel reinforcement is introduced and hardened after hardening of the concrete in prefabricated channels, for example, from EP 0 624 697 B1 previously known.

The basic principle of the production of sleepers, in particular pre-stressed prestressed concrete railway sleepers, in which the tensioning reinforcement formed longitudinally in the concrete body consists of two steel rod ends rolled up in the form of two hairpins and four pressure distribution shells and four nuts DE 1 058 909 C explained. In order to quickly clear the mold for the production of further thresholds after the removal of a threshold, mold matrices have been proposed in the mold end walls, the mold on the anchor side consisting of steel sheets passed through a cross-shaped cut-out in the mold front wall and correspondingly shaped to the reinforcing hairpins. where steel pipes of larger diameter than the reinforcement join.

On the anchor side of the die is according to DE 1 058 909 C a face plate provided with a rubber seal and a bore in the middle, which is connected by a centrally disposed screw longitudinally movable with the perpendicular crossing plates.

The threshold production is therefore in molding boxes with two end plates, of which the armature-side end plate is provided with a cross-shaped cutout and the tension side with four holes corresponding to the number of prestressing steels.

For producing the channels and the recesses in the concrete for the subsequent installation of the clamping reinforcement are used corresponding matrices, which usually consist of two perpendicularly intersecting steel plates.

The production of sleepers with immediate shuttering and retrofitting can be summarized as follows.

Through the cross-shaped cut-out in the aforementioned armature-side end plate of the molding box, the die is pushed until its end plate rests against the end wall of the molding box.

After several further preparation steps in the sense of later picking up elements of the tension reinforcement, fresh concrete is poured into the molding box.

The fresh threshold is pushed out of the 180 ° turned molding box and deposited on a solid support. After sufficient hardening of the concrete, the preformed, bent prestressing steels or tie rods are threaded and then usually biased by means of tensioning device.

Even in the case when working with a immediate demolition plant already with a very rigid concrete, there is a danger that as a result of shutting down the precast concrete immediately after the compaction and the deposition of raw precast concrete elements, especially the thresholds, it is due to production technically necessary cavities in the threshold, that is, especially in the sleeper head, deformations occur. These deformations due to gravity lead to a visible change in the otherwise level surface of the precast concrete element.

Although as a rule such deformations have no negative static effects on the product, it is desirable to obtain a visually perfect threshold, which corresponds to the predetermined tolerances.

From the above, it is therefore an object of the invention to provide a device for stabilizing the front sides of precast concrete parts, in particular the threshold heads of sleepers, which are manufactured in immediate shuttering with subsequent composite, with their help changes in the surface configuration in the precast concrete part, in particular their sleepers, can be avoided.

The device to be created should be easily assignable and reusable in the manufacturing process of the instantaneous shuttering technology, so that no appreciable additional costs and / or higher production costs result.

The solution of the object of the invention is achieved by a device according to the Feature combination according to claim 1, wherein the dependent claims represent at least expedient refinements and developments.

It is therefore assumed that a device for stabilizing the front sides of precast concrete, here in particular the threshold heads of sleepers or sleepers, the precast concrete parts are manufactured in immediate shuttering and are provided after curing with a clamping reinforcement.

The one or more mold boxes used have at least one of their end faces on an opening for receiving a known die, which keeps a cavity in the precast concrete part.

This cavity serves to accommodate the reinforcement later and the means for tensioning the reinforcing elements.

According to the invention, a mold part which is inserted into the cavity in the respective precast concrete part and is removable after curing is formed, the three-dimensional contour and shape of which is at least complementary to the front end or the frontal section of the cavity created by the female mold in the precast concrete part and this cavity area, the concrete in the curing process supporting, filling.

It is therefore used according to the invention after the removal of the thresholds at a corresponding workplace in the so-called crosshead of the threshold, the molding as a stabilizer.

The molded part as a stabilizer is removed after complete curing of the concrete and directly before the installation of the tension reinforcement again from the threshold and can be reused so far.

The use of the stabilizing molded part does not lead to a collapse of concrete sections, in particular in the area of the technologically necessary cavities, in particular in the threshold head area.

In a further development of the invention, the molded part has a circumferential, lateral projection for creating a contact surface, based on the front side of the precast concrete part on.

As a result, too deep penetration and a possibly not exact position of the molded part relative to the cavity is avoided.

In a particular embodiment, the molded part has a cross shape or a cross shape and, to that extent, is based on the configuration of known dies.

The molding may have on its side facing the cavity inclined surfaces or bevels or chamfers for easier insertion into the precast concrete element and removal therefrom.

On the material side, the molded part consists of a plastic, for example polypropylene, or a rubber material or similar material.

Within the molded part of this stabilizing, metallic reinforcing and / or handling elements can be arranged.

The molding may further comprise a recess, a blind hole or similar means for attaching a handle for easier insertion or removal into the cavity of the sleeper head.

As already mentioned, the molded part is designed as a reusable component.

The molding may consist of a solid material or else have cavities.

In particular, in the case that the molded part has cavities, reinforcing and / or handling elements can be arranged or arranged in the cavity.

These reinforcing and / or handling elements can be designed, for example, as pins or bolts.

The molding may be provided with a lubricious and / or non-stick coating or be equipped in such a way to prevent caking in the fresh, respectively only partially cured concrete.

• 1 zeigt hierbei die Vorderseite eines Formteiles, ausgebildet als sogenannter Kreuzstabilisator mit einer Bohrung zur Aufnahme eines Stiftes, wobei im linken Bildteil der Stift noch nicht in die zugehörige Aufnahmebohrung eingeschoben ist und im rechten Bildteil der Zustand mit vollständig eingeschobenen Stift dargestellt ist, und
• 2 eine Darstellung ähnlich derjenigen nach 1, jedoch mit einer Rückseitenansicht des Kreuzstabilisators einmal mit noch nicht eingeschobenem Stift (linker Bildteil) und im Zustand mit eingeschobenem Stift (rechter Bildteil).

The invention will be explained below with reference to an embodiment and with the aid of figures.

• 1 in this case shows the front of a molded part, designed as a so-called cross stabilizer with a bore for receiving a pin, wherein in the left part of the image the pen is not yet inserted into the associated receiving bore and in the right part of the picture state with fully inserted pin is shown, and
• 2 a representation similar to that after 1 , but with a back view of the cross stabilizer once with not yet inserted pin (left picture part) and in the state with inserted pin (right picture part).

The device according to the figures thus goes from a molding in a cross shape, that is a cross stabilizer 1 , out.

Its cross-shaped, three-dimensional structure and shape is adapted to a cavity in the respective precast concrete part and designed accordingly complementary, which is a cavity which is created at a front end of a die, which is used in the immediate post-molding technology with subsequent composite.

The cross stabilizer 1 stabilizes the corresponding precast concrete during the Abbindevorganges by the concrete surrounding the cavity is supported.

The cross stabilizer or the molding 1 can have a circumferential lateral projection 2 have to create a contact surface based on the end face of the precast concrete part, not shown.

Furthermore, the molding has according to the figurative representations on its side facing the cavity in the precast concrete in case of application side inclined surfaces 3 for easier insertion and removal from the cavity.

If, as in the 2 represented, the molding or the cross stabilizer 1 has the cavities apparent in the figure, it is possible in these cavities a pin-shaped reinforcing and / or handling element 4 contribute. In this regard, are insertion 5 or drilling 6 in partitions 7 of the molding 1 available. The element 4 serves in particular for removing the cross stabilizer or molded part 1 after hardening of the concrete, that is pulling the cross stabilizer 1 from the sleep head.

Front side of the molding 1 there is still the possibility of introducing a blind hole with thread (not shown) to attach a handle for insertion but also for removing the molded part.

Although in the described embodiment of a molded part designed as a cross stabilizer, that is, a stabilizer in a cruciform, is assumed, depending on the design of the matrices used in the manufacture also find another shape, contour or shape use, provided that the corresponding, created in the precast concrete cavity equivalent.

With the use of the molding according to the invention for stabilizing the end faces of precast concrete elements, in particular of sleeper heads, deformations, in particular the sagging of surfaces on the sleeper end face, are reliably prevented and excluded, so that the necessary quality requirements of the users are satisfied. Reworking and other corrections on the sleeper head can therefore be reduced to a minimum.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0624697 B1 [0002]
• DE 1058909 C [0003, 0004]

Claims (11)

Device for stabilizing the front sides of precast concrete elements, in particular the threshold heads of sleepers, which are manufactured in immediate shuttering and provided with a tension reinforcement after curing, wherein the respective molding box has on at least one of its end faces an opening for temporarily receiving a die having a cavity in the Prefabricated prefabricated part, characterized in that a in the cavity in the precast concrete insert and after curing removable mold part (1) is formed whose three-dimensional contour and shape is at least the front end of the cavity created in the precast concrete cavity complementary and this cavity area, supporting the concrete in the curing process fills. Setup after Claim 1 , characterized in that the molded part (1) has a circumferential, lateral projection (2) for creating a contact surface relative to the front side of the precast concrete part. Setup after Claim 1 or 2 Characterized in that the molded part (1) has a cross shape. Device according to one of the preceding claims, characterized in that the molded part (1) has on its side facing the cavity in the precast concrete side inclined surfaces (3) for ease of insertion and removal. Device according to one of the preceding claims, characterized in that the molded part (1) consists of a plastic or rubber-like material. Device according to one of the preceding claims, characterized in that within the molded part (1), this stabilizing, metallic reinforcing and / or handling elements (4) are arranged. Device according to one of the preceding claims, characterized in that the molded part (1) comprises a recess, a blind hole or a similar means for attaching a handle. Device according to one of the preceding claims, characterized in that the molded part (1) is designed as a reusable component. Device according to one of the preceding claims, characterized in that the molded part (1) consists of a solid material or has cavities. Setup after Claim 6 and 9 , characterized in that in particular in the cavities of the molded part reinforcing and / or handling elements (4) are located. Setup after Claim 10 , characterized in that the respective reinforcing and / or handling elements (4) are designed as insertable pins or bolts.

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