EP3401460A1 - Wood-concrete compound system with distributed transverse load - Google Patents

Abstract

The present invention has for its object to provide a wood-concrete composite system (HBV system), with a distribution of a single load can be removed flexibly and extensively over a larger area. This object is achieved according to the invention by an HBV system (2) which comprises the following components: a) a first support element (10), in particular a wooden crossbar, wherein the first support element (10) is arranged to extend substantially horizontally and with a on the first support element (10) supporting load bearing element (8) is acted upon, the load (FE ) ablates on the first support element (10); b) at least one second support element (14, 16), which is aligned substantially parallel to the load elements (10) acted upon by the load (F E); c) at least one load distribution element (4, 6, 18, 20, 22) attached to the first support element (10) and to the at least second support element (14, 16) and optionally also attached to the load bearing element (8); and d) a concrete structure (12) which is at least partially supported by the first support element (10) and the at least one second support element (14, 16). In this way, an HBV system has been created in which a transverse distribution of occurring, on-site single loads is achieved. Typically, within the concrete structure, e.g. a slender concrete layer and a false floor area, a construction is provided, which the individual loads each left and / or right on the adjacent support elements, such. Crossbeam, cross-distributed, so as to achieve an additional static upgrading of the affected areas and to achieve this with the least possible constructive and constructional effort.

Description

The present invention relates to a wood-concrete composite system (HBV system).

In the construction of new buildings and the renovation of old buildings, the utilization of the static load-bearing capacity of wooden beams plays a major role. Overall, the desired load-bearing capacity is ultimately achieved by the combination of wooden elements, such as cross-beams, and concrete elements, such as concrete floors and floors. Often, however, in the context of a construction of a wood-concrete composite system, individual loads conventionally stand on a crossbeam or on the concrete surface. These individual loads must be removed statically determined, with additional steel beams, timber beams or concrete bars, which are aligned in the clamping direction of the axial position of the crossbar, are used in the respective area concerned. High single loads usually stir from an overlying floor, z. B. a roof in the form of pencils. However, there are also limits to this removal insofar as the crossbeam as a whole still has to be able to remove the corresponding loads at the latest at its support points.

The present invention is therefore based on the object to provide an HBV system with which a distribution of a single load can be removed flexibly and over a larger area in a form-fitting manner and in a clamped form expandable.

1. a) ein erstes Tragelement, insbesondere ein Holzquerbalken (d.h. ein Bestandsbalken in Haupttragrichtung), wobei das erste Tragelement im Wesentlichen waagrecht verlaufend angeordnet ist und mit einem sich auf dem ersten Tragelement abstützenden Lasttragelement direkt oder indirekt beaufschlagt ist, das eine Last auf das erste Tragelement abträgt;
2. b) mindestens ein zweites Tragelement, das im Wesentlichen parallel zu dem durch die Last beaufschlagten Tragelemente ausgerichtet ist;
3. c) mindestens ein Lastverteilelement, das an dem ersten Tragelement und an dem mindestens zweiten Tragelement befestigt ist und optional auch an dem Lasttragelement befestigt ist; und
4. d) einer Betonstruktur, die von dem ersten Tragelement und dem mindestens einen zweiten Tragelement zumindest teilweise getragen ist.

This object is achieved according to the invention by an HBV system which comprises the following components:

1. a) a first support element, in particular a wooden crossbeam (ie a stock beam in the main supporting direction), wherein the first support element is arranged to extend substantially horizontally and with a on the first support element supporting load-bearing element is applied directly or indirectly, which removes a load on the first support member;
2. b) at least one second support element, which is aligned substantially parallel to the loaded by the load supporting elements;
3. c) at least one load distribution element, which is attached to the first support member and to the at least second support member and optionally also attached to the load bearing member; and
4. d) a concrete structure which is at least partially supported by the first support member and the at least one second support member.

In this way, an HBV system has been created in which a transverse distribution of occurring, on-site single loads is achieved. Typically, within the concrete structure, e.g. a slender concrete layer and a false floor area, a construction is provided, which the individual loads on the left and / or right on the adjacent support elements, such as. Crossbeam, cross-distributed, so as to achieve an additional static upgrading of the affected areas and to achieve this with the least possible constructive and constructional effort.

In an advantageous embodiment of the present invention, it can be provided that the load distribution element is aligned substantially perpendicular to a clamping direction of the first and the at least one second support element. This results in a simple embodiment of the load transverse distribution and a comparatively simple calculation model of the removal of the static loads.

For removing larger static loads, it may be provided that the load distribution element expands over a number of several second support elements and is secured thereto. In this way, the loads can be removed over relatively large areas to the outside of the actual load bearing point. It can Depending on the situation, it may be provided that the load distribution element expands symmetrically or else asymmetrically, starting from an attachment point of the load-bearing element.

In the field of open construction site, it is generally advantageous if the funds used are simply designed and / or operated. With regard to the load distribution element, this can be achieved in an advantageous embodiment, when the load distribution element is designed as a metal rail, which can be preferably designed as a crane rail or as a rail with a U-shaped profile. Alternatively, the load distribution element can also be designed as a concrete bar. This concrete bar can be prefabricated, or even in situ on the site by formwork in the false bottom areas between the crossbars, are threaded through the appropriate reinforcing bars, and poured with in-situ concrete.

In a further particularly advantageous manner, the load of the load-bearing element can be removed via the load distribution element to the first and the at least one second support element. This means that the load-bearing element does not rest or stand directly on the first support element, but already acts on the first support element in a load-reduced manner in accordance with the static distribution of the load through the load distribution element.

Further advantageous embodiments of the invention can be found in the remaining subclaims.

Figur 1

in schematischer Darstellung eine seitliche Ansicht eines Holz-Beton-Verbundsystems - nachfolgend kurz HBV genannt - mit einer mit einer Kranschiene querabgestützten Einzellast;

Figur 2

in schematischer Darstellung eine Aufsicht auf das HBV gemäss Figur 1;

Figur 3

in schematischer Darstellung eine seitliche Ansicht auf ein HBV mit einer mit einer Betonschwelle querabgestützten Einzellast;

Figur 4

in schematischer Darstellung eine seitliche Ansicht eines Holz-Beton-Verbundsystems - nachfolgend kurz HBV genannt - mit einer mit u-förmigen Metallschienen querabgestützten Stiellast;

Figur 5

in schematischer Darstellung eine seitliche Ansicht auf das HBV senkrecht zu der Darstellung gemäss Figur 4;

Figur 6

in schematischer Darstellung eine perspektivische Ansicht auf ein HBV mit einer durch eine Betonschwelle querabgestützten Einzellast; und

Figur 7

in schematischer seitlicher Darstellung das HBV gemäss Figur 6 mit nun eingegossener Betonschicht.

Preferred embodiments of the invention are explained below with reference to the accompanying drawings. These show in:

FIG. 1

a schematic view of a side view of a wood-concrete composite system - hereafter called HBV - with a transversely supported with a crane rail single load;

FIG. 2

in a schematic representation of a supervision of the HBV according to FIG. 1 ;

FIG. 3

a schematic view of a side view of an HBV with a transversely supported with a concrete sleeper single load;

FIG. 4

a schematic representation of a side view of a wood-concrete composite system - hereafter abbreviated to HBV - with a cross-supported with U-shaped metal rails Stiellast;

FIG. 5

in a schematic representation of a side view of the HBV perpendicular to the illustration according to FIG. 4 ;

FIG. 6

a schematic representation of a perspective view of an HBV with a transversely supported by a concrete sleeper single load; and

FIG. 7

in a schematic side view of the HBV according to FIG. 6 with now poured concrete layer.

FIG. 1 shows a schematic representation of a side view of a wood-concrete composite system - hereafter called HBV 2 - with a transversely supported by means of two crane rails 4, 6 single load F _E , which is registered on a vertically oriented load-carrying beam 8. The load-carrying beam 8 rests here on a cross-beam 10 extending in the plane of the paper. The crane rails 4, 6 have been cast into a concrete layer 12 during the production of the HBV 2. The crane rails 4, 6 are with the crossbar 10 and further in the FIG. 2 screwed recognizable crossbeam.

In the graphic supervision according to FIG. 2 is now seen that the crossbeam 10 more parallel arranged crossbars 14, 16 are provided. The crane rails 4, 6 expand over all crossbars 10, 14, 16 and have been bolted to them before the concrete layer 12 has been introduced, has been poured in the rule. In this way, the single load F _E can be removed over several crossbeams and thus rests only with a fraction of the actual load on the crossbar 10. The execution of the crane rails and the question of how many crossbeams the single load F _{E is to be} removed, depends on the to be met static conditions and must be determined for each individual case according to common vector algebra.

FIG. 3 shows now in schematic view one opposite FIG. 2 only slightly modified situation for the transverse removal of the single load F _E. Instead of the crane rails 4, 6 here only a concrete bar 18 is used, which bolted to the crossbars 10, 14, 16, which run perpendicular to the plane of the drawing, and later poured over with the concrete layer 12.

It should be mentioned at this point that the HBV 2 can also be designed in such a way that, as part of the concrete casting, an in-situ cast concrete bar 18 'is designed transversely to the clamping direction of the transverse bars 10, 14, 16. This situation is in FIG. 6 shown. In this case, a reinforcement of bar steel 17 is threaded transversely to the clamping direction of the crossbars through the individual crossbars 10, 14, 16. In addition, a false floor area 19 is shut off and sealed by means of sheathing boards 21, so that an underlying ceiling (not shown here) undergoes any damage due to concrete leakage during the concrete casting. In this way, the concrete bar 18 'in the casting process in the false bottom portion 19 between the existing crossbars 10, 14, 16 (stock beams in the main tension direction) are cast from the concrete used for concrete casting in situ.

The result of this process is shown in a lateral schematic in the FIG. 7 shown. Very nicely recognizable is the disconnected Fehlbodenbereich 19 as well the positioning of the steel bar 17 is facilitated by two visible in this illustration bracket 23, 25. These brackets 23, 25 are screwed onto the crossbar 10.

FIG. 4 shows now in schematic view one opposite FIG. 1 only slightly modified situation for the transverse removal of the single load F _E. Instead of the crane rails 4, 6 here U-shaped metal profiles 20, 22 are used, which on the crossbar 10, 14, 16, as in FIG. 5 shown run perpendicular to the plane of the graphic representation, rest. On the U-shaped metal profiles 20, 22 are also smaller U-shaped profile plates 24, 26, each comprising a head bolt 28, 30, welded. After attachment of the U-shaped profile plates 24, 26, the concrete layer 12 is poured again. As an alternative to the smaller U-shaped profiled plates 24, 26 with the head bolts, the head bolts can also be mounted in situ on the construction site in a positive and non-positive manner.

FIG. 5 shows a schematic side view of the arrangement of the U-shaped profile plates 24a to 24d. The U-shaped metal profiles 20, 22 extend over more than three transverse bars 10, 14, 16. The U-shaped metal profile 20 is bolted to the load bearing beam 8 with four screws.

• eine hohe Eigenbiegefestigkeiten, bei gleichzeitig niederer Profilhöhe gegeben ist;
• wahlweise dieses Profil idealerweise als Kranschiene oder dickwandigem Hohlkastenprofil ausgebildet ist;
• das Profil kraft- und formschlüssig als Einspannung mit den vorhandenen Querbalken mittels Holzbauschrauben oder Befestigungsplatten verbunden wird;
• im Idealfall die vorhandene Einzellast auf ein n-tel der Gefachanzahl der zu verteilenden Querbalken ausgebildet werden kann;
• die Befestigungspunkte im Querverteilungsprofil als Raster vorgefertigt werden;
• das System in eine Standardbetonplattendicke voll integriert ist, ohne daß das Profil über die Betonschichtdicke nach oben hinaus ragt;
• keine zusätzliche Konstruktionshöhe betonseitig notwendig ist;
• der Verbund im Beton korrosionsgeschützt ist;
• in Spannrichtung die organische, vorhandene Schubverbindung des HBV-Systems durch das Profil ersetzt wird;
• ganz erheblich die Schwingungssteifigkeit zusätzlich erhöht wird;
• das System in der Effektivität der Querverteilung variabel ausgebildet werden kann;
• profilunabhängig der Bewehrungsführung und der Bewehrungslage ausgeführt und eingebaut werden kann;
• die Profilform eine sehr hohe Eigensteifigkeit - idealerweise ein IY >= 90 bzw. 180 cm 4 hoch 4;
• pro Kreuzungspunkt die formschlüssige Befestigung mit - idealerweise 2 - bis 6 Holzbetonverbund/Holzbauschlüsselschrauben, die auf Herausziehen beansprucht werden, leicht für die zur Querverteilung herangezogenen Balken befestigbar sind;
• der Einbau des Querverteilungsprofils von Hand ohne zusätzliches Hebezeug jederzeit ausführbar ist;
• eine Mindestbetonplattendecke von 60 cm ausreichend ist, um das Querverteilungssystem in die Betonplattendicke zu integrieren;
• die statische Höhe des Gefachsbereichs in diesem Verfahren nicht benötigt wird;
• Der Gefachbereich nicht ausgeräumt, abgeschalt, bewehrt und mit Beton gefüllt werden muss;
• die Gefahr einer Beschädigung der Unterdeckenkonstruktion ausgeschlossen ist;
• keine symetrische Querverteilung notwendig ist und dass das Profil den baulichen Gegebenheiten angepasst werden kann;
• durch die optimale Querverteilung die zusätzliche Schubbeanspruchung des Holzquerbalkens durch die Einzellast minimiert wird;
• die Befestigungsdimensionen der Holzbauschlüsselschrauben/Holzbetonverbundschrauben den Erfordernissen in Durchmesser und Lage leicht und flexibel angepasst werden kann; und
• das HBV 2 ein Einfeld- oder Mehrfeldträgersystem sein kann.

The FIGS. 1, 2 . 4 and 5 therefore describe the use of a special metal profile, which as well as the concrete bar 18 is used transversely to the clamping direction of the crossbar. In this case, this profile is applied to the top of the lost formwork and fastened in each affected by the transverse distribution beam through the original existing profile flange. This method is characterized in that:

• a high inherent bending strength, given at the same low profile height;
• Optionally, this profile is ideally designed as a crane rail or thick-walled hollow box section;
• the profile is non-positively and positively connected as clamping with the existing crossbeams by means of wood screws or mounting plates;
• Ideally, the existing single load can be formed to a n-th of the Gefachanzahl of distributing crossbars;
• the attachment points in the transverse distribution profile are prefabricated as a grid;
• the system is fully integrated into a standard concrete slab thickness without the profile projecting beyond the concrete layer thickness;
• no additional construction height is required on the concrete side;
• the composite is corrosion-protected in the concrete;
• in the clamping direction, the organic, existing thrust connection of the HBV system is replaced by the profile;
• quite significantly the vibration stiffness is additionally increased;
• the system can be made variable in the effectiveness of the transverse distribution;
• profile-independent of the reinforcement guide and the reinforcement layer can be executed and installed;
• the profile shape a very high rigidity - ideally an IY> = 90 or 180 cm 4 high 4;
• For each crossing point, the positive fastening with - ideally 2 - to 6 wood-concrete composite / Holzbauschlüsselschrauben, which are claimed to pull out, easily fastened to the used for transverse distribution bars can be fastened;
• the installation of the transverse distribution profile by hand without additional hoist is executable at any time;
• a minimum concrete slab of 60 cm is sufficient to integrate the transverse distribution system into the concrete slab thickness;
• the static height of the Gefachsbereichs is not needed in this process;
• The Gefachbereich must not be cleared, shut down, reinforced and filled with concrete;
• the risk of damage to the slab construction is excluded;
• no symmetrical transverse distribution is necessary and that the profile can be adapted to the structural conditions;
• the optimal transverse distribution minimizes the additional shear stress of the wooden crossbeam due to the single load;
• the fixing dimensions of the wooden key screws / wood concrete composite screws can be easily and flexibly adapted to the requirements in diameter and position; and
• HBV 2 may be a single-field or multi-field carrier system.

Claims (7)

HBV system (2), comprising: a) a first support element (10), in particular a wooden crossbeam, wherein the first support element (10) is arranged substantially horizontally extending and with a on the first support element (10) supporting load bearing element (8) is acted upon directly or indirectly, the one Removing load (F _E ) onto the first support element (10); b) at least one second support element (14, 16), which is aligned substantially parallel to the load elements (10) acted upon by the load (F _E ); c) at least one load distribution element (4, 6, 18, 20, 22) attached to the first support element (10) and to the at least second support element (14, 16) and optionally also attached to the load bearing element (8); and d) a concrete structure (12) which is at least partially supported by the first support element (10) and the at least one second support element (14, 16). HBV system (2) according to claim 1,
characterized in that
the load distribution element (4, 6, 18, 20, 22) is aligned substantially perpendicular to a clamping direction of the first and the at least one second support element (10, 14, 16). HBV system (2) according to claim 1 or 2,
characterized in that
the load distribution element (4, 6, 18, 20, 22) extends over a number of a plurality of second support elements (14, 16) and is fastened thereto or rests on these. HBV system (2) according to one of claims 1 to 3,
characterized in that
the load distribution element (4, 6, 18, 20, 22) expands symmetrically or else asymmetrically starting from an attachment point of the load-bearing element (10). HBV system (2) according to one of claims 1 to 4,
characterized in that
the Lastverteilelement (4, 6, 18, 20, 22) is a metal rail, which is preferably designed as a crane rail or as a rail with a U-shaped profile. HBV system (2) according to one of claims 1 to 4,
characterized in that
the load distribution element is designed as a concrete bar (18, 18 '). HBV system (2) according to one of claims 1 to 6,
characterized in that
the load of the load-bearing element is removed via the load distribution element to the first and the at least one second support element.

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