EP3933141A1 - Pre-cast concrete component, in particular pre-cast concrete panel - Google Patents

Abstract

Precast concrete component, in particular precast concrete slab with at least one lifting sleeve concreted into the component. The component can be fixed to a transport device by means of the lifting sleeve. The lifting sleeve has at least one first sleeve opening, at least one sleeve shank for receiving a lifting key and a sleeve end opposite the first sleeve opening. The lifting sleeve also has at least one cross-sectional widening in the form of a lifting chamber. The inside diameter d_K of the lifting chamber is larger than the inside width bs of the sleeve shaft.

Description

The invention relates to a precast concrete component, in particular a precast concrete slab with at least one lifting sleeve concreted into the component, the component being fixable on a transport device by means of the lifting sleeve. The prefabricated concrete components or prefabricated concrete slabs according to the invention are used in particular as a substrate or a drivable substrate for storage areas, parking and storage areas, for areas in the construction industry, for roads and the like.

Prefabricated concrete components or prefabricated concrete slabs of the type described above are known in principle in different embodiments from practice. Particularly with large-area prefabricated concrete components or prefabricated concrete slabs, transport as well as handling and assembly at the installation site is often a challenge. In this connection it is known to provide transport anchors which are integrated into the precast concrete components and which can be fixed to a transport device such as a crane. In addition, it is known from practice to handle precast concrete components with the aid of vacuum lifting devices. This handling with vacuum lifting devices can be used both in the course of the assembly of the precast concrete components or precast concrete slabs, as well as in the context of production when the precast concrete components have to be lifted out of a formwork, for example.

In the case of the measures known from practice, however, it has been shown that they are not suitable for all types of precast concrete components or precast concrete slabs. For example, vacuum lifting devices cannot be used reliably for prefabricated concrete components or prefabricated concrete slabs made of open-pored concrete, because no secure fixation is achieved due to the open pores. Furthermore, it has been shown that in the production of precast concrete components or precast concrete slabs - especially in the formwork, in which it is possible that the precast concrete components or precast concrete slabs are not yet fully or only partially cured - both the known transport anchors and Vacuum lifting devices are sometimes not suitable for functionally reliable and fault-free handling. This applies in particular to prefabricated concrete components or prefabricated concrete slabs made of open-pored concrete. - In this respect there is a need for improvement.

In contrast, the invention is based on the technical problem of specifying a precast concrete component, in particular a precast concrete slab, which can be handled safely and reliably and in particular can be securely and reliably fixed to a transport device.

To solve this technical problem, the invention teaches a precast concrete component, in particular a precast concrete slab with at least one lifting sleeve concreted into the component, the component being fixable on a transport device by means of the lifting sleeve, the lifting sleeve having at least one first sleeve opening, at least one sleeve shaft for receiving a lifting wrench and has a sleeve end opposite the first sleeve opening, the lifting sleeve having at least one cross-sectional widening in the form of a lifting chamber and the inside diameter d _{K of} the lifting chamber being greater than the inside width bs of the sleeve shaft.

The invention is based on the knowledge that the precast concrete component according to the invention or the lifting sleeve concreted in it enables functionally reliable and simple handling of the precast concrete component or the precast concrete slab and in particular enables reliable fixation on a transport device. This applies both to the production, in particular to the formwork of the precast concrete component, as well as to the assembly. It is within the scope of the invention that the handling of the precast concrete component according to the invention or the precast concrete slab according to the invention, in particular the fixation on a transport device, takes place with the aid of a lift key which can be inserted into the sleeve shaft of the lift sleeve according to the invention and preferably in the at least one lift chamber and / or can be transferred from an insertion position into an anchoring position on the top side of the precast concrete component or the underside of the precast concrete component. This is explained in more detail below.

Instead of the term precast concrete component or precast concrete slab, the term component or slab is used here and below. Inside diameter d _{K of} the lifting chamber means in the context of the invention in particular the largest inside diameter of the lifting chamber transversely, in particular perpendicular to the longitudinal extent or to the longitudinal axis A of the lifting sleeve. Inside width bs of the sleeve shaft means in the context of the invention in particular the largest inside width of the sleeve shaft transversely, in particular perpendicular to the longitudinal extent or to the longitudinal axis A of the lifting sleeve or the sleeve shaft and transversely, in particular perpendicular to the longitudinal center axis A _{Q of} the cross-sectional area of the sleeve shaft. It is within the scope of the invention that the ratio of the inner diameter d _{K of} the lifting chamber to the inner width bs of the sleeve shaft is between 1.1: 1 and 4: 1, preferably between 1.5: 1 and 3: 1, preferably between 1.7: 1 and 2.2: 1, very particularly preferably between 1.9: 1 and 2.1: 1, for example about 2: 1.

According to a preferred embodiment of the precast concrete component according to the invention, in the precast concrete component or in the precast concrete slab at least two lifting sleeves concreted in. It is recommended that a component or a plate has two to six lifting sleeves, preferably two to four lifting sleeves and particularly preferably two lifting sleeves, which are embedded in concrete in the component or in the plate. The embodiment with at least two lifting sleeves is based on the knowledge that the component or the plate can be fixed particularly reliably and securely to a transport device by at least two lifting sleeves embedded in concrete.

It is preferred that the lifting sleeve according to the invention is at least partially hollow on the inside and is preferably hollow on the inside over its entire length L or essentially over its entire length L. The lifting sleeve is therefore recommended to have a cavity which extends in the direction of the longitudinal axis A of the lifting sleeve over its entire length. The diameter of the cavity is expediently at least 70%, preferably at least 75%, very preferably at least 80% and particularly preferably at least 85% of the outer diameter of the lifting sleeve.

According to a preferred embodiment of the precast concrete component according to the invention, the lifting sleeve is concreted into the component over its entire length L or essentially over its entire length L. In the context of the invention, length L of the lifting sleeve means in particular the greatest extent of the lifting sleeve along or in the direction of its longitudinal axis A.

It is preferred that the first sleeve opening is assigned to the underside of the component or the plate and in particular is accessible from the underside of the component or the plate. In the context of the invention, the underside of the component or the plate means the side of the component or the plate facing the mounting substrate in the assembled state of the component or the plate. in the Within the scope of this preferred embodiment, a lifting wrench can preferably be inserted into the sleeve shaft of the lifting sleeve through the first sleeve opening, expediently from the underside of the component. In principle, it is also within the scope of the invention that the first sleeve opening is assigned to the upper side of the component or the plate and is then expediently accessible from the upper side of the component or the plate. However, the first sleeve opening is preferably assigned to the underside of the component or the plate.

According to a recommended embodiment of the precast concrete component according to the invention, the at least one lifting chamber is designed as a hollow cylindrical section of the lifting sleeve, which in particular has a round, preferably circular cross-section with the inner diameter d _K. In the context of the invention, cross section of the lifting chamber means in particular the cross section transverse, in particular perpendicular to the longitudinal axis A of the lifting sleeve. If, according to a particularly preferred embodiment, the lifting chamber is designed as a hollow cylindrical section with a circular cross section, the inside diameter d _{K of} the lifting chamber corresponds to the circular diameter or the circular inside diameter of the cross-sectional area. This embodiment is based on the knowledge that a lifting wrench - through the first sleeve opening, which is preferably assigned to the underside of the component - can be inserted into the sleeve shaft and can be transferred from an insertion position to an anchoring position in the hollow-cylindrical lifting chamber by a rotary movement, so that the Prefabricated concrete component or the prefabricated concrete slab can be fixed to a transport device by means of the lifting sleeve and the lifting key.

It is preferred that the ratio of the length L _{H of} the lifting chamber to the length L of the lifting sleeve 1:12 to 1: 4, preferably 1:10 to 1: 6, preferably 1: 9 to 1: 7, for example 1: 8 or about 1: 8. In this context, length L _{H of} the lifting chamber means the greatest extent of the lifting chamber in the longitudinal direction of the lifting sleeve or in the direction of the longitudinal axis A of the lifting sleeve.

It is within the scope of the invention that the sleeve shaft is designed as a hollow body, the inner length Ls of which is preferably greater than its inner width bs. In this context, the inner length Ls of the sleeve shaft means in particular the greatest inner length transversely, in particular perpendicular to the longitudinal axis A of the lifting sleeve and along or in the direction of the longitudinal center axis A _{Q of} the cross-sectional area of the sleeve shaft and thus transversely, in particular perpendicular to the inside width bs of the sleeve shaft. It is within the scope of the invention that the ratio of the inner length Ls of the sleeve shaft to the inner width bs of the sleeve shaft 1.1: 1 to 4: 1, preferably 1.5: 1 to 3: 1, preferably 1.7: 1 to 2, 2: 1, particularly preferably 1.9: 1 to 2.1: 1, for example about 2: 1. It is preferred that the inner length Ls of the sleeve shaft corresponds or essentially corresponds to _{the inner diameter d K of the lifting chamber.}

According to a preferred embodiment of the precast concrete component according to the invention or the precast concrete slab according to the invention, the sleeve shaft is designed as a hollow body, the cross-sectional area of which is provided as a rounded rectangle. According to a further preferred embodiment, the sleeve shaft is designed as a hollow body, the cross-sectional area of which is elliptical. In principle, other cross-sectional geometries for the sleeve shaft are also within the scope of the invention, for example an oval, rectangular, square, triangular or similar cross-sectional geometry. It is essential that the inside diameter d _{K of} the lifting chamber is greater than the inside width bs of the sleeve shaft.

A particularly recommended embodiment of the invention is characterized in that the precast concrete component according to the invention or a precast concrete slab according to the invention is designed for a drivable surface, for example for a drivable road, a drivable storage area, a drivable parking area, such as a parking deck or the like. The thickness of a precast concrete slab according to the invention is recommended to be 50 to 300 mm, preferably 100 to 250 mm and particularly preferably 160 to 200 mm. It is recommended that a lifting sleeve according to the invention extends over at least 70%, preferably over at least 80%, preferably over at least 90% and very particularly preferably over at least 95% of the thickness of the precast concrete component or the precast concrete slab.

Appropriately, a precast concrete slab according to the invention is rectangular in plan view. According to a recommended embodiment, the side lengths of such a rectangular plate can each be 600 to 3000 mm, preferably 800 to 2500 mm, particularly preferably 1000 to 2200 mm.

According to a preferred embodiment of the precast concrete component according to the invention or the precast concrete slab according to the invention, the longitudinal axis A of the lifting sleeve is arranged transversely, in particular perpendicular or substantially perpendicular to the underside and / or the top of the component. In the context of the invention, the upper side of the component means in particular the side of the component facing away from the mounting substrate in the assembled state. It is therefore within the scope of the invention that the longitudinal axis A of the lifting sleeve in the assembled state of the precast concrete component or the precast concrete slab is oriented transversely, in particular perpendicular or substantially perpendicular to the mounting substrate. Mounting surface means within the scope of the invention in particular the subsurface or the ground on which the precast concrete component according to the invention or the precast concrete slab according to the invention is mounted or laid.

A very preferred embodiment of the invention is characterized in that the lifting chamber is assigned to the sleeve end. It is possible that the lifting chamber forms the end of the sleeve. The distance a between the lifting chamber and the sleeve end is recommended between 2% and 49%, preferably between 5% and 40%, preferably between 7% and 35%, particularly preferably between 10% and 30% and very particularly preferably between 15% and 25% of the length L of the lifting sleeve. Distance a between the lifting chamber and the sleeve end means the greatest distance between the lifting chamber and the sleeve end in the direction / along the longitudinal extent or the longitudinal axis A of the lifting sleeve, the length L _{H of} the lifting chamber itself counting halfway to this distance a. This preferred embodiment, in which the lifting chamber is assigned to the sleeve end, is particularly important if, according to the recommended variant of the invention, the first sleeve opening is assigned to the underside of the component and in particular is accessible from the underside of the component. A lifting wrench can then expediently be inserted into the sleeve shaft from the underside of the component and transferred from the insertion position to an anchoring position in the lifting chamber assigned to the sleeve end by a rotary movement. In this anchoring position, the precast concrete component or the precast concrete slab can be fixed to a transport device by means of the lift key. This is particularly advantageous if the plate is to be removed from a formwork in the course of its manufacture, with the top side of the plate facing the bottom of the formwork according to a preferred embodiment. The introduction of force when lifting the component or the In the context of this preferred embodiment, the plate then takes place in the area of the plate opposite or facing away from the first sleeve opening.

It is within the scope of the invention that the lifting sleeve has at least two lifting chambers. Then one of the lifting chambers is preferably assigned to the sleeve end and / or a further lifting chamber is assigned to the first sleeve opening.

According to a preferred embodiment of the invention, the lifting sleeve has at least one anchoring rib which runs around the outer circumference of the lifting sleeve by at least 70%, preferably by at least 80%, preferably completely or essentially completely. It is preferred that the lifting sleeve has at least two such anchoring ribs. Depending on the length L of the lifting sleeve and thus preferably also depending on the thickness of the prefabricated concrete component or the prefabricated concrete building board, it is possible for the lifting sleeve to have a plurality of anchoring ribs, for example three to six anchoring ribs. The anchoring ribs enable the at least one lifting sleeve to be set in concrete particularly safely and securely in the precast concrete component, which in particular withstands greater forces, for example when the precast concrete component is fixed by means of the lifting sleeve by a lifting key on a transport device in an anchoring position in the lifting chamber.

It is within the scope of the invention that the component or the prefabricated concrete building board is produced on the basis of at least one open-pore concrete and in particular consists or essentially consists of at least one open-pore concrete. Such an open-pore concrete is also referred to as free-pore concrete and expediently has cavities between the grains of rock. It is preferred that the component according to the invention, in particular the precast concrete slab according to the invention, is water-permeable.

A particularly recommended embodiment of the precast concrete component according to the invention or the precast concrete slab according to the invention is characterized in that the sleeve end is designed as a second sleeve opening, which is preferably assigned to the top of the component and is preferably accessible from the top of the component. Such an embodiment with a sleeve end configured as a second sleeve opening is of particular importance in the context of the invention. In this embodiment, the lifting sleeve has a first sleeve opening which is expediently assigned to the underside of the component and in particular accessible from the underside of the component and the lifting sleeve also has a second sleeve opening which is recommended to be assigned to the top of the component and preferably from the top of the component is accessible. In the context of such an embodiment, in the course of manufacturing the component in a formwork, in which the upper side of the component preferably faces or is assigned to the underside of the formwork, a lifting wrench can expediently be inserted through the first sleeve opening into the sleeve shaft and through the lifting chamber a rotary movement can be transferred from the insertion position to an anchoring position. Then the prefabricated concrete component or the prefabricated concrete slab can be fixed to a transport device by means of the lifting sleeve and the lifting key located in the anchoring position and lifted out of the formwork. To assemble the precast concrete component or the precast concrete slab, the hub key can then be inserted from the opposite component side, in particular the upper side of the component, through the second sleeve opening into the sleeve shaft and completely through the Lifting sleeve are passed through and then transferred to an anchoring position on the underside of the component or the plate by a rotary movement, so that the precast concrete component or the precast concrete slab can be mounted or laid. The embodiment of the precast concrete component according to the invention or the precast concrete slab according to the invention with a first sleeve opening, a second sleeve opening and a lifting chamber is thus based on the knowledge that the component or the plate by means of the lifting sleeve both in the context of the production of the component or the plate from the Formwork can be lifted, as well as can be safely handled in the context of the assembly of the component or the plate. In this respect, the lifting sleeve of the component according to the invention advantageously fulfills at least two functions.

The subject of the invention is thus also a lifting sleeve for setting in concrete in a precast concrete component, in particular in a precast concrete slab - preferably in a precast concrete component of the type described above - wherein the lifting sleeve has at least one first sleeve opening, at least one sleeve shaft for receiving a lifting wrench and one opposite to the first sleeve opening Having the sleeve end, the lifting sleeve having at least one cross-sectional widening in the form of a lifting chamber, the inside diameter d _{K of} the lifting chamber being greater than the inside width bs of the sleeve shaft.

According to a preferred embodiment of the lifting sleeve according to the invention, the sleeve is produced on the basis of at least one plastic and the lifting sleeve preferably consists of at least one plastic or essentially of at least one plastic.

To solve the technical problem, the invention also teaches a system of a lift wrench and a lift sleeve - in particular a lift sleeve described above - wherein the lift wrench has at least one anchor head and at least one guide rod, the anchor head being designed in such a way that it can pass through a sleeve opening in the lifting sleeve is insertable and in the lifting chamber and / or on the underside or top of the component by a rotary movement, preferably around the longitudinal axis of the lifting key or the guide rod, preferably by 10 ° to 90 °, particularly preferably by about 90 °, of can be transferred from an insertion position to an anchoring position.

It is within the scope of the invention that a fastening element is provided on the guide rod of the lift wrench, expediently on the side opposite the anchor head, with which the lift wrench can be fixed to a transport device. The fastening element can be, for example, a fastening eyelet. The shape of the anchor head of the lift wrench is such that it can be inserted into the lift sleeve through at least one sleeve opening and, in this insertion position, can be guided through the sleeve shaft. It is recommended that the anchor head, in the insertion position in which it can be guided through the sleeve shaft, cannot be rotated in the sleeve shaft or is essentially not rotatable in the sleeve shaft. In the lifting chamber of the lifting sleeve, the anchor head can then be transferred from the insertion position into an anchoring position, preferably by a rotary movement about the longitudinal axis of the lifting key or the guide rod. For this purpose, the lift wrench is set in a rotary movement about its longitudinal axis and in particular rotated by 10 ° to 90 °, preferably 45 ° to 90 °, particularly preferably 70 ° to 90 °, very particularly preferably about 90 °. It is preferred that the lift wrench based on at least one Metal is formed and in particular consists of at least one metal. The hub wrench is particularly preferably made of steel or essentially of steel.

It is also within the scope of the invention that the lifting wrench is inserted through the first or the second sleeve opening into the sleeve shaft and is guided completely through the lifting sleeve to the opposite side of the component or the plate and there by a rotary movement around the longitudinal axis of the guide rod is transferred into an anchoring position. In the anchoring position, the anchor ends of the anchor head also expediently engage behind a surface of the lifting chamber or the upper or lower side of the component or the plate.

The invention also relates to a method for producing a prefabricated concrete component, in particular a prefabricated concrete component described above, the component being manufactured in a formwork, the component side provided as the top of the component preferably facing the bottom of the formwork, with the at least a lifting sleeve is introduced into the component, after the at least partial hardening of the component to remove the component from the formwork, a lift key is inserted into the sleeve shaft through the first sleeve opening facing the side preferably provided as the underside of the component and into an anchoring position in the lifting chamber is transferred and the component is then removed or lifted from the formwork by means of the lifting wrench.

The manufacturing method according to the invention has proven itself particularly for components or prefabricated concrete building panels made of open-pored concrete. In the production of the precast concrete component according to the invention, the is in the assembled or laid condition as the upper side of the component provided component side preferably facing the bottom of the formwork. The lifting chamber of the lifting sleeve is recommended to be assigned to the sleeve end, which is designed in particular as a second sleeve opening. The second sleeve opening is recommended to be assigned to the upper side of the component. The lifting chamber is therefore also expediently assigned to the upper side of the component. When the precast concrete component is at least partially cured, a lift key can be inserted into the sleeve shaft through the first sleeve opening, which is preferably assigned to the underside of the component, and transferred into the anchoring position in the lift chamber. During the subsequent removal of the component from the formwork by means of the lift wrench, in which the lift wrench is preferably fixed to a transport device, the introduction of force into the component or the plate is therefore preferably carried out on the component side provided as the upper side of the component and consequently in particular on the Bottom of the formwork side. In this way it is possible to remove the component or the plate from the formwork, even if the component or the plate is made of open-pore concrete according to a preferred embodiment variant and / or has not yet fully cured.

According to a preferred embodiment of the invention, a subsurface, in particular a drivable subsoil with a plurality or a plurality of precast concrete slabs arranged next to one another - for example 100 to 400 precast concrete slabs - is implemented. It is within the scope of the invention that each of these precast concrete slabs has at least two concreted lifting sleeves. Each precast concrete slab preferably takes up an area of 1 to 10 m ² , preferably 2 to 6 m ² . It is preferred that the prefabricated concrete slabs for creating the subsoil or the drivable subsoil by means of at least one transport device, for example be arranged in the desired positions by means of at least one transport crane, the precast concrete slabs being fixed to the transport device via their lifting sleeves and preferably via the system of a lifting wrench and a lifting sleeve.

Thus, the invention also teaches a method for handling a precast concrete component, in particular a precast concrete slab, preferably a precast concrete component of the type described above, wherein a lift key is preferably inserted from the underside of the component through a first sleeve opening in the sleeve shaft of a lifting sleeve and in a lifting chamber through a Rotary movement is transferred to an anchoring position. The precast concrete component is then handled in this anchoring position by means of a transport device. The method further comprises the step of introducing the lift key through a second sleeve opening, which is recommended to be assigned to the upper side of the component, in the sleeve shaft, the lift key being guided completely through the sleeve shaft to the bottom of the component and there by a rotary movement around the longitudinal axis of the Lifting key is transferred into an anchoring position. The component is then expediently fixed in this anchoring position by means of the lifting key on a transport device and handled in this way. To handle a prefabricated concrete component, it is alternatively possible within the scope of the invention that the first sleeve opening is assigned to the component top and that the component top faces the top of the formwork during manufacture of the component or the plate. Then, according to one embodiment, a lifting wrench can be inserted from the top of the component through the first sleeve opening into the sleeve shaft and transferred into an anchoring position in the lifting chamber so that the component can be handled. As part of this alternative In the embodiment, the lifting key is then preferably reinserted into the sleeve shaft through the first sleeve opening assigned to the upper side of the component and either guided completely through the sleeve shaft to the underside of the component and there transferred into an anchoring position or transferred again in the lifting chamber to an anchoring position, so that the component or the disk can be handled.

If, according to an alternative embodiment of the invention, the lifting sleeve has at least two lifting chambers, the lifting wrench can first be introduced into the sleeve shaft of the lifting sleeve, preferably from the underside of the component, through a first sleeve opening, and into an anchoring position in the first lifting chamber, which is expediently assigned to the component top or plate top be convicted. The precast concrete component or the precast concrete slab is then handled in this anchoring position by means of a transport device. Furthermore, as part of such a method, the lifting key can be introduced into the sleeve shaft through a second sleeve opening, which is recommended to be assigned to the top of the component, and transferred into an anchoring position in a second lifting chamber, preferably assigned to the underside of the component or the underside of the plate. The component is then expediently fixed in the anchoring position by means of the lift key on a transport device and handled in this way.

The invention is based on the knowledge that the precast concrete component according to the invention or the precast concrete slab according to the invention can be fixed in a functionally reliable and simple manner to a transport device by means of the lifting sleeve according to the invention. The fixation on a transport device is also possible in particular if, according to a preferred embodiment variant, an open-pored concrete is used as the material for the Prefabricated concrete component or the prefabricated concrete slab is used. If, according to a particularly recommended embodiment of the invention, the lifting sleeve has a first and a second sleeve opening, the sleeve is accessible from both sides of the component or the plate and, in particular, simple and particularly advantageous handling of the component or the plate can be achieved both within the framework of the Manufacture of the plate - for example during the formwork -, as well as during the assembly of the plate. It should also be mentioned that the formwork of the component or the plate with the lifting sleeve according to the invention can also take place when the component is not yet completely cured and has not yet reached its full strength. A particular advantage of the invention is that one and the same lifting sleeve is used both for dismantling the component, in which a lifting key is preferably transferred into an anchoring position in the lifting chamber and is then fixed to a transport device, as well as during assembly of the component or the plate, in which a lifting wrench is preferably transferred to an anchoring position on the underside of the plate and is fixed to a transport device, can be used. It should also be emphasized that the advantages according to the invention are achieved in a simple and inexpensive manner and the invention thus - particularly with a view to the known measures - causes low costs or manufacturing costs.

Fig. 1

einen Schnitt durch ein erfindungsgemäßes Bauteil bzw. durch eine erfindungsgemäße Platte mit einbetonierter erfindungsgemäßer Hubhülse,

Fig. 2

eine Draufsicht auf eine erfindungsgemäße Hubhülse,

Fig. 3

eine erfindungsgemäße Hubhülse und einen Hubschlüssel in einer perspektivischen Ansicht,

Fig. 4a

den Gegenstand gemäß Fig. 1 mit einem Hubschlüssel in der Einführposition

Fig. 4b

den Gegenstand gemäß Fig. 1 mit einem Hubschlüssel in der Verankerungsposition in der Hubkammer

Fig. 4c

den Gegenstand gemäß Fig. 1 mit einem Hubschlüssel in einer Verankerungsposition an der Unterseite des Bauteils bzw. der Platte.

The invention is explained in more detail below with the aid of a drawing showing only one exemplary embodiment. It shows in a schematic representation:

Fig. 1

a section through a component according to the invention or through a plate according to the invention with a lifting sleeve according to the invention embedded in concrete,

Fig. 2

a plan view of a lifting sleeve according to the invention,

Fig. 3

a lifting sleeve according to the invention and a lifting wrench in a perspective view,

Figure 4a

the subject according to Fig. 1 with a lift wrench in the insertion position

Figure 4b

the subject according to Fig. 1 with a lift key in the anchoring position in the lift chamber

Figure 4c

the subject according to Fig. 1 with a lift wrench in an anchoring position on the underside of the component or the plate.

The figures show a precast concrete slab 1 according to the invention with at least one lifting sleeve 2 concreted into the plate 1. The plate 1 can be fixed by means of the lifting sleeve 2 on a transport device, for example a crane. The lifting sleeve 2 has a first sleeve opening 3, a sleeve shaft 4 for receiving a lifting wrench 11 and a sleeve end 5 opposite the first sleeve opening 3. Preferably, and in the exemplary embodiment according to the figures, the sleeve end 5 is designed as a second sleeve opening 10. According to the invention, the lifting sleeve 2 has a widened cross-section in the form of a lifting chamber 6. According to the invention, the inner diameter d _{K of} the lifting chamber 6 is greater than that Inner width bs of the sleeve shaft 4. This is particularly important in the Figs. 1 and 2 to recognize. Inside diameter d _{K of} the lifting chamber 6 means in the context of the invention and in the exemplary embodiment in particular the largest inside diameter of the lifting chamber transversely, in particular perpendicular to the longitudinal extent or to the longitudinal axis A of the lifting sleeve 2. Inside width bs of the sleeve shaft 4 means in the context of the invention and in the exemplary embodiment in particular the largest inner width of the sleeve shaft 4 transversely, in particular perpendicular to the longitudinal extension or to the longitudinal axis A of the lifting sleeve 2 or the sleeve shaft 4 and transversely, in particular perpendicular to the longitudinal center axis A _{Q of} the cross-sectional area of the sleeve shaft 4. This is particularly in the Fig. 2 shown. In the embodiment according to the figures (in particular FIGS. 1 and 2 ) the ratio of the inner diameter d _{K of} the lifting chamber 6 to the inner width bs of the sleeve shaft 4 may be approximately 2: 1. At least two lifting sleeves 2 may be concreted into the precast concrete slab 1. In the embodiment according to Fig. 1 only a lifting sleeve 2 is shown.

Preferably, and in the exemplary embodiment, the lifting sleeve 2 is designed to be hollow on the inside over its entire length L. Within the scope of the invention and in the exemplary embodiment, the lifting sleeve 2 is also concreted into the precast concrete slab 1 over its entire length L or essentially over its entire length L. Length L of the lifting sleeve 2 means within the scope of the invention and in the exemplary embodiment, in particular, the greatest extent of the lifting sleeve 2 along or in the direction of its longitudinal axis A, as is particularly evident in FIGS Fig. 1 and 3 can be seen.

Appropriately and in the exemplary embodiment according to the figures, the first sleeve opening 3 is assigned to the underside 7 of the precast concrete slab 1 and is accessible in particular from the underside 7 of the slab 1. Underside 7 of the precast concrete slab 1 means within the scope of the invention and in the exemplary embodiment the side of the plate 1 facing the mounting substrate in the assembled state or in the laid state of the plate 1 Underside 7 of plate 1, as shown in the Figure 4a is shown. Recommended and in the exemplary embodiment, the sleeve end 5 is designed as a second sleeve opening 10 and this second sleeve opening 10 is preferred and, in the exemplary embodiment, assigned to the top side 8 of the plate 1 and particularly preferably accessible from the top side 8 of the plate 1. The term upper side of the plate in this context means in particular the side of the plate 1 facing away from the mounting substrate in the assembled state of the precast concrete plate 1.

According to a particularly recommended embodiment of the invention and in the exemplary embodiment, the lifting chamber 6 is designed as a hollow cylindrical section of the lifting sleeve 2. The lifting chamber 6 preferably and in the exemplary embodiment has a circular cross section with the inner diameter d _K. Cross-section of the lifting chamber 6 means in particular the cross-section transverse, in particular perpendicular to the longitudinal axis A of the lifting sleeve 2. The inside diameter d _{K of} the lifting chamber 6, designed as a hollow cylindrical section with a circular cross-section, corresponds within the scope of the invention and in the exemplary embodiment to the circular diameter or circular inner diameter of the cross-sectional area. This is especially true in the Fig. 2 to recognize. The ratio of the length L _{H of} the lifting chamber 6 to the length L of the lifting sleeve 2 is expediently 1:10 to 1: 6, preferably 1: 9 to 1: 7, particularly preferred and in the exemplary embodiment ( Fig. 3 ) 1: 8 or about 1: 8. In this context, length L _{H of} the lifting chamber means in particular the greatest extent of the lifting chamber 6 in the longitudinal direction of the lifting sleeve 2 or in the direction of the longitudinal axis A of the lifting sleeve 2.

According to a preferred embodiment of the invention and in the exemplary embodiment, the sleeve shaft 4 of the lifting sleeve 2 is designed as a hollow body, the inner length L _{S of which is} recommended and, in the exemplary embodiment, greater than its inner width b _S. In this context and in the exemplary embodiment, the inner length L _{S of} the sleeve shaft 4 means in particular the greatest inner length transversely, in particular perpendicular to the longitudinal axis A of the lifting sleeve 2 and along or in the direction of the longitudinal center axis A _{Q of} the cross-sectional area of the sleeve shaft 4 and thus transversely, in particular perpendicular to the inner width bs of the sleeve shaft 4 ( Fig. 2 ). In the context of the invention and in the exemplary embodiment, the inner length L _{S of} the sleeve shaft 4 corresponds to the inner diameter d _{K of} the lifting chamber 6 or L _S essentially _{corresponds to d K.} In the exemplary embodiment according to the figures, the sleeve shaft 4, which is expediently designed as a hollow body, has a cross-sectional area which is designed as a rounded rectangle.

Expediently and in the exemplary embodiment, the longitudinal axis A of the lifting sleeve 2 is arranged transversely, in particular perpendicular or substantially perpendicular to the underside 7 and the top 8 of the precast concrete slab 1. Thus, in the assembled state of the precast concrete slab 1, the longitudinal axis A of the lifting sleeve 2 is preferably oriented transversely, in particular perpendicular or substantially perpendicular to the mounting substrate.

Recommended and in the exemplary embodiment, the lifting chamber 6 is assigned to the sleeve end 5. The distance a between the lifting chamber 6 and the sleeve end 5 or the second sleeve opening 10 is preferably between 10% and 35%, very particularly preferably between 15% and 30% of the length L of the lifting sleeve 2. In the exemplary embodiment (see in particular Fig. 3 ) the distance a between the lifting chamber 6 and the sleeve end 5 may be approximately 20% of the length L of the lifting sleeve 2. Distance a between the lifting chamber 6 and the sleeve end 5 means within the scope of the invention and in the exemplary embodiment in particular the greatest distance between the lifting chamber 6 and the sleeve end 5 in the direction / along the longitudinal extension or longitudinal axis A of the lifting sleeve 2, the length L _{H being} the Lifting chamber 6 itself counts halfway to this distance a.

According to a preferred embodiment and in the exemplary embodiment, the lifting sleeve 2 has two anchoring ribs 9 which each completely or essentially completely encircle the outer circumference of the lifting sleeve 2.

The precast concrete slab 1 in the figures may, according to a preferred embodiment variant of the invention, consist of at least one open-pored concrete or consist essentially of it. The lifting sleeve 2 is expediently made of at least one plastic.

Also shown in the figures is a lifting wrench 11 which is provided for interaction with the lifting sleeve 2. The lift wrench 11 has at least one anchor head 12 and at least one guide rod 13. The anchor head 12 is designed in such a way that it can be inserted into the lifting sleeve 2 through a sleeve opening 3, 10 and in the lifting chamber 6 and / or on the bottom 7 or top 8 of the plate 1 by a rotary movement about the longitudinal axis of the lifting key 11 or of the guide rod 13, preferably by 10 ° to 90 °, preferably by about 90 °, from an insertion position ( Figure 4a ) into an anchoring position ( Figures 4b and 4c ) can be transferred. The lift key 11 is in the Fig. 3 shown together with the lifting sleeve 2. In the context of the invention and in the exemplary embodiment, on the guide rod 13 of the lift wrench 11 is on the side opposite the anchor head 12 a fastening element 14 is provided with which the lifting wrench 11 can be fixed on a transport device. In the embodiment according to Fig. 3 the fastening element 14 is designed as a fastening eyelet. In the context of the invention, the lift wrench 11 expediently consists of at least one metal. In the exemplary embodiment according to the figures, the lift wrench 11 may consist of steel or consist essentially of steel.

In the context of the invention and in the exemplary embodiment according to the figures, the lifting sleeve 2 according to the invention has at least two functions. In the course of the production of the precast concrete slab 1, the slab 1 is manufactured in a formwork, the top side 7 of the plate 1 preferably facing the bottom of the formwork. During the manufacture of the plate 1, at least one lifting sleeve 2 is introduced into the plate 1. After the at least partial hardening of the plate 1, to remove the plate 1 from the formwork, a lift wrench 11 is inserted into the sleeve shaft 4 through the first sleeve opening 3, which is preferably intended as the underside 7 of the component. This is in the Figure 4a shown. In the lifting chamber 6, the lifting key 11 is transferred into an anchoring position. This anchoring position is in the Figure 4b shown. For transferring from the insertion position ( Figure 4a ) into the anchoring position ( Figure 4b ) the lift wrench 11 is rotated by a rotary movement about the longitudinal axis of the lift wrench 11 or the guide rod 13 - expediently by about 90 °. The plate 1 can then be removed or lifted from the formwork by means of the lifting wrench 11. For this purpose, it is possible for the lifting wrench 11 to be fixed to a transport device by means of the fastening element 14. The lifting sleeve 2 embedded in concrete in the slab 1 thus fulfills a first function in the context of the production of the slab 1 ( Figures 4a and 4b ).

The lifting sleeve 2 is recommended to have a further function in the context of mounting the plate 1 on the intended mounting surface. For the assembly of the plate 1, this is already rotated so that the plate underside 7 points in the direction of the mounting surface. This is in the Figure 4c shown. To assemble or relocate the plate 1, the lifting wrench 11 can recommended be inserted from the top of the plate 8 through the second sleeve opening 10 into the sleeve shaft 4 and passed completely through the lifting sleeve 2 in this insertion position. This insertion position in the course of assembly is not shown in more detail in the figures. Subsequently, the lifting key 11 on the underside 7 of the plate 1 can be transferred from the insertion position to the anchoring position by a rotary movement about the longitudinal axis of the lifting key 11 or the guide rod 13 by approximately 90 °. This anchoring position is in the Figure 4c shown. In the anchoring position of the lifting wrench 11, the anchor ends 15 of the anchor head 12 reach behind, as recommended, and in the exemplary embodiment a surface 16 of the lifting chamber 6 ( Figure 4b ) or the underside 7 of the plate 1 ( Figure 4c ).

Claims (15)

Prefabricated concrete component, in particular prefabricated concrete slab (1) with at least one lifting sleeve (2) concreted into the component, the component being fixable on a transport device by means of the lifting sleeve (2), the lifting sleeve (2) having at least one first sleeve opening (3), at least one Has a sleeve shaft (4) for receiving a lift wrench and a sleeve end (5) opposite the first sleeve opening (3), the lift sleeve (2) having at least one cross-sectional widening in the form of a lift chamber (6) and the inside diameter (d _K ) of the lift chamber (6) is greater than the inner width (b _S ) of the sleeve shaft (4). Precast concrete component according to claim 1, wherein at least two lifting sleeves (2) are concreted into the precast concrete component or the precast concrete slab (1). Prefabricated concrete component according to one of Claims 1 or 2, the lifting sleeve (2) being at least partially hollow on the inside and preferably hollow on the inside over its entire length (L) or essentially over its entire length (L). Prefabricated concrete component according to one of Claims 1 to 3, the lifting sleeve (2) being concreted into the component over its entire length (L) or essentially over its entire length (L). Prefabricated concrete component according to one of Claims 1 to 4, the first sleeve opening (3) being assigned to the underside (7) of the component and in particular being accessible from the underside (7) of the component. Prefabricated concrete component according to one of claims 1 to 5, wherein the lifting chamber (6) is designed as a hollow cylindrical section of the lifting sleeve (2), which in particular has a round, preferably a circular cross-section with the inner diameter d _K. Prefabricated concrete component according to one of Claims 1 to 6, the sleeve shaft (4) being designed as a hollow body _{, the inner length (L S} ) of which is preferably greater than its inner width (b _S ). Precast concrete component according to one of Claims 1 to 7, the longitudinal axis (A) of the lifting sleeve (2) being arranged transversely, in particular perpendicular or substantially perpendicular to the underside (7) and / or the top (8) of the component. Precast concrete component according to one of claims 1 to 8, wherein the lifting chamber (6) is assigned to the sleeve end (5), the distance (a) between the lifting chamber (6) and the sleeve end (5) preferably between 2% and 49%, preferably between 5% and 40%, particularly preferably between 7% and 35%, very particularly preferably between 10% and 30%, for example between 15% and 25% of the length (L) of the lifting sleeve (2). Precast concrete component according to one of claims 1 to 9, wherein the lifting sleeve (2) has at least one anchoring rib (9) which surrounds the outer circumference of the lifting sleeve (2) by at least 70%, preferably by at least 80%, preferably completely or substantially completely . Precast concrete component according to one of claims 1 to 10, wherein the component or the precast concrete slab (1) is based on at least one is made open-cell concrete and in particular consists of at least one open-cell concrete or consists essentially. Precast concrete component according to one of claims 1 to 11, wherein the sleeve end (5) is designed as a second sleeve opening (10), which is preferably assigned to the top (8) of the component and is preferably accessible from the top (8) of the component. Lifting sleeve for setting in concrete in a precast concrete component, in particular in a precast concrete slab (1) - preferably in a precast concrete component according to one of claims 1 to 12 - wherein the lifting sleeve (2) has at least one first sleeve opening (3), at least one sleeve shaft (4) for receiving a Hub wrench and a sleeve end (5) opposite the first sleeve opening (3), the lifting sleeve (2) having at least one cross-sectional widening in the form of a lifting chamber (6), the inner diameter (d _K ) of the lifting chamber (6) being greater than the inside width (bs) of the sleeve shaft (4). A system of a lift key and a lift sleeve - in particular a lift sleeve (2) according to claim 13 - wherein the lift key (11) has at least one anchor head (12) and at least one guide rod (13), the anchor head (12) being designed in such a way that it can be inserted through a sleeve opening (3, 10) into the lifting sleeve (2) and in the lifting chamber (6) and / or on the underside (7) or top (8) of the component by a rotary movement, preferably around the longitudinal axis of the Lifting key (11) or the guide rod (12), preferably by 10 ° to 90 °, particularly preferably by about 90 °, can be transferred from an insertion position to an anchoring position. Method for producing a precast concrete component, in particular a precast concrete component according to one of claims 1 to 12, wherein the component is manufactured in a formwork, the component side provided as the upper side (8) of the component preferably facing the bottom of the formwork, wherein during the production of the Component the at least one lifting sleeve (2) is introduced into the component, after the at least partial hardening of the component to remove the component from the formwork, a lift key through the first sleeve opening (3) assigned to the side preferably provided as the underside (7) of the component is introduced into the sleeve shaft (4) and is transferred into an anchoring position in the lifting chamber (6) and the component is then removed or lifted from the formwork by means of the lifting key.

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