EP0435823A1 - Lattice girder for concrete cover - Google Patents

Lattice girder for concrete cover Download PDF

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Publication number
EP0435823A1
EP0435823A1 EP90810994A EP90810994A EP0435823A1 EP 0435823 A1 EP0435823 A1 EP 0435823A1 EP 90810994 A EP90810994 A EP 90810994A EP 90810994 A EP90810994 A EP 90810994A EP 0435823 A1 EP0435823 A1 EP 0435823A1
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EP
European Patent Office
Prior art keywords
lattice girder
belt
lattice
cross
hollow profile
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German (de)
French (fr)
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Jean Bernold
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04—Lining with building materials
    • E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
    • E04C5/065—Light-weight girders, e.g. with precast parts

Definitions

  • the invention relates to a lattice girder for concrete linings on rock walls, with at least three belt bars, which are rigidly connected to each other by a strut to form a triangular or quadrangular cross section.
  • the concrete is either spray-applied after the installation of lattice girders and reinforcement grids, or it is poured in after the formwork elements have been installed on profiled steel girders at a distance from the rock wall behind them.
  • the profiled steel girders which are more resilient, are not suitable for shotcrete.
  • the invention has for its object to find a lattice girder of the type mentioned, which has a considerably increased load capacity at a relatively low weight, so that it is suitable both for the concrete spraying method and for the concrete shell construction.
  • This object is achieved according to the invention in that at least one outer belt rod facing the rock wall has a hollow profile, the space enclosed by the hollow profile being larger than the cross-sectional size of the other belt rods.
  • lattice girders 1-6 serve to secure the rock by correspondingly to the progressive Tunnel excavation in the circumferential direction of the tunnel cross section can be mounted on the rock wall 8.
  • individual arch-shaped carrier elements are firmly connected to one another in the circumferential direction at their ends to form a supporting arch.
  • This work is made considerably easier by its low weight in relation to its strength.
  • Another advantage is that, due to their strength and structure, they can be used not only for inclusion in shotcrete, but also as a support for formwork and reinforcement elements to absorb the loads that occur when the formwork is backfilled.
  • the lattice base structure formed from round steel material is combined to a limited extent with a rolled profile which consists of a hollow profile with a high section modulus.
  • the outer belt rod 9 facing the rock wall 8 is formed from a steel sheet which is curved in cross section, so that its outside is rounded and its cross-sectional legs 10, 11 form a continuation of the triangular cross-sectional shape of the lattice girder.
  • the strut elements 13, 14 that connect this belt bar 9 with the two inner belt bars via welding points also run in the same plane as its cross-sectional leg 10, 11.
  • the cross-sectional size of the outer belt rod 9 having the hollow cross-section is selected taking into account the relatively large sheet thickness so that the static center of gravity lies in the middle of the cross-section of the beam.
  • the length of the straight part of the cross-sectional leg of the outer belt rod 9 is in the range of 20 to 40% of the straight side length of the cross section of the beam.
  • the strut elements 13, 14 either consist of individual round steel bars inclined in the longitudinal direction of the girder bars 9, 16, 17 or they are bent from a strand material in a wave or zigzag shape, so that they are in this form between the belt bars 9, 16 or 9.17 back and forth, as is known per se from FR-A-1.098.003.
  • individual strut elements 19-21 are provided at regular intervals, which run perpendicular to the belt bars 16, 17 and enclose them in a bow-like manner from the inside of the beam cross section.
  • the bent ends 23 of the strut elements 19 can protrude outward from the cross-section of the beam in order to attach a reinforcement grid 24 to them.
  • the reinforcing mesh 24 is attached to the lattice girder 2.
  • the lower right part of the cross-sectional view of FIG. 2 shows an embodiment in which the strut elements 19 enclose the belt bars 16, 17 in the form of a flat ring.
  • formwork and reinforcement grids 26 are attached to the strut elements connecting the inner belt rods 16, 17, as shown in FIGS. 1, 3, 5 and 6, which are made from a combination of coarse-mesh girder lattice and fine-mesh formwork lattice consist.
  • separate formwork and reinforcement lattices (27) are provided, which have strut brackets 28 at regular intervals, the hook-shaped bent ends 29, 30 of which are arranged opposite one another inner straps 17, 16 of adjacent lattice girders 2 can be hooked in as shown in FIG. 5.
  • the preferably outer belt rod 32 facing the rock face or two outer belt rods 33, 34 can be designed as a perforated tube which has a filler neck 36 protruding inwards from the concrete lining 35 , 37 is connected for a cement mixture.
  • an injection material i.e. a cement mixture in the or the tubular belt rods 32-34
  • these are filled so that their strength increases.
  • the injection material is pressed through numerous holes 38, 39 into the surrounding shotcrete mass, so that voids remaining through the formation of splash shadows are filled and a concrete supporting arch of increased quality is created by a force-fitting connection with the rock wall 8.
  • a closure cap 50 prevents concrete mass from flowing back after completion.
  • the two outer and two inner belt rods 33, 34, 40, 41 of the embodiment of the lattice girder 6 according to FIG. 9 are connected to one another in four cross-sectional directions by strut elements 42 to 45 running in two diagonal and two mutually parallel planes.
  • the filler neck 37 has two branches 47, 48 in a V-shaped arrangement.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Lining And Supports For Tunnels (AREA)

Abstract

The lattice girder (1) for concrete linings on rock faces has an outer boom member (9) turned towards the rock face (8) and designed as a hollow profile. The inner boom members (16, 17) are composed of round bar steel, and they are connected to the outer boom member (9) by means of bracing elements (13, 14). The hollow profile of the outer boom member (9) having a substantially larger cross-sectional shape affords the lattice girder (1) greater strength with a statically balanced cross-sectional shape, without substantially increasing the spray-shadow formation. As a result, the lattice girder (1) is suitable both for sprayed-concrete linings and as a support for concrete forms to be backfilled by no-fines concrete. <IMAGE>

Description

Die Erfindung betrifft einen Gitterträger für Betonauskleidungen an Felswänden, mit mindestens drei Gurtstäben, die durch Verstrebungselemente starr zu einem Dreiecks- oder Vierecksquerschnitt miteinander verbunden sind.The invention relates to a lattice girder for concrete linings on rock walls, with at least three belt bars, which are rigidly connected to each other by a strut to form a triangular or quadrangular cross section.

Für die Herstellung von Betonauskleidungen an Felswänden, z.B. im Untertagebau, wird der Beton entweder nach Anbringen von Gitterträgern und Armierungsgittern im Spritzverfahren aufgebracht oder er wird nach Montieren von Schalungselementen an Profilstahlträgern im Abstand von der Felswand hinter diesen eingefüllt.For the production of concrete linings on rock walls, e.g. In underground construction, the concrete is either spray-applied after the installation of lattice girders and reinforcement grids, or it is poured in after the formwork elements have been installed on profiled steel girders at a distance from the rock wall behind them.

Beim Spritzbetonieren sind die höher belastbaren Profilstahlträger aufgrund der Ausbildung von Spritzschatten nicht geeignet.Due to the formation of spray shadows, the profiled steel girders, which are more resilient, are not suitable for shotcrete.

Der Erfindung liegt die Aufgabe zugrunde, einen Gitterträger der genannten Art zu finden, der bei verhältnismässig geringem Gewicht eine wesentlich erhöhte Belastbarkeit aufweist, so dass er sowohl für das Betonspritzverfahren als für die Betonschalenbauweise geeignet ist. Die Lösung dieser Aufgabe erfolgt erfindungsgemäss dadurch, dass mindestens ein der Felswand zuzukehrender äusserer Gurtstab ein Hohlprofil aufweist, wobei der von dem Hohlprofil umschlossene Raum grösser ist als die Querschnittsgrösse der anderen Gurtstäbe. Vorteilhafte Ausgestaltungen des Gitterträgers sowie ein Schalungs- und Armierungsgitter zur Verwendung mit dem Gitterträger sind Gegenstand der abhängigen Patentansprüche.The invention has for its object to find a lattice girder of the type mentioned, which has a considerably increased load capacity at a relatively low weight, so that it is suitable both for the concrete spraying method and for the concrete shell construction. This object is achieved according to the invention in that at least one outer belt rod facing the rock wall has a hollow profile, the space enclosed by the hollow profile being larger than the cross-sectional size of the other belt rods. Advantageous configurations of the lattice girder and a formwork and reinforcement lattice for use with the lattice girder are the subject matter of the dependent claims.

Im folgenden wird die Erfindung anhand von in den Zeichnungen dargestellten Ausführungsbeispielen näher erläutert. Es zeigt:

  • Fig. 1 einen in Längsrichtung einer Tunnel-Felswand gerichteten Querschnitt durch einen Teil einer Betonauskleidung,
  • Fig. 2 einen Querschnitt durch einen in Spritzbeton eingeschlossenen Gitterträger, wobei zwei Ausführungsformen von inneren Verbindungselementen je hälftig dargestellt sind,
  • Fig. 3 einen Schnitt in Längsrichtung eines an einer Felswand angeordneten Gitterträgers,
  • Fig. 4 einen Querschnitt durch drei ineinandergestapelte Gitterträger, bevor sie mit inneren Verstrebungselementen ausgerüstet sind,
  • Fig. 5 einen Querschnitt durch zwei unvollständig gezeigte Gitterträger mit einer sie verbindenden Schalungs- und Armierungsmatte,
  • Fig. 6 eine Aufsicht auf die inneren Gurtstäbe eines Gitterträgers mit Schalungs- und Armierungsgitter,
  • Fig. 7 einen Querschnitt durch einen in Spritzbeton eingeschlossenen Gitterträger,
  • Fig. 8 einen Längsschnitt durch den Gitterträger nach Fig.7,
  • Fig. 9 einen Querschnitt durch einen Gitterträger mit vier Gurtstäben
The invention is explained in more detail below on the basis of exemplary embodiments illustrated in the drawings. It shows:
  • 1 shows a cross section directed in the longitudinal direction of a tunnel rock wall through part of a concrete lining,
  • 2 shows a cross section through a lattice girder enclosed in shotcrete, two embodiments of inner connecting elements each being shown in half,
  • 3 shows a section in the longitudinal direction of a lattice girder arranged on a rock wall,
  • 4 shows a cross section through three stacked lattice girders before they are equipped with inner strut elements,
  • 5 shows a cross section through two incompletely shown lattice girders with a formwork and reinforcement mat connecting them,
  • 6 is a plan view of the inner belt bars of a lattice girder with formwork and reinforcement grids,
  • 7 shows a cross section through a lattice girder enclosed in shotcrete,
  • 8 shows a longitudinal section through the lattice girder according to FIG. 7,
  • Fig. 9 shows a cross section through a lattice girder with four belt bars

Beim Untertagebau dienen erfindungsgemässe Gitterträger 1-6 der Gebirgssicherung, indem sie entsprechend dem fortschreitenden Tunnelausbruch in Umfangsrichtung des Tunnelquerschnittes an der Felswand 8 montiert werden. Dabei werden auf an sich bekannte Weise einzelne bogenförmige Trägerelemente in Umfangsrichtung an ihren Enden miteinander zu einem Tragbogen fest verbunden. Sie können durch Ankerbolzen 7 einen festen Verbund mit der Felswand 8 erhalten oder sie werden bis zur Betonverfestigung durch eine nicht dargestellte Stützmechanik von innen abgestützt gehalten. Durch ihr im Verhältnis zu ihrer Festigkeit geringes Gewicht wird diese Arbeit wesentlich erleichtert. Ein weiterer Vorteil besteht darin, dass sie aufgrund ihrer Festigkeit und Struktur nicht nur für den Einschluss in Spritzbeton sondern auch als Träger für Schalungs- und Armierungselemente dienen können, um die beim Hinterfüllen der Schalung auftretenden Belastungen aufzunehmen.In underground construction, lattice girders 1-6 according to the invention serve to secure the rock by correspondingly to the progressive Tunnel excavation in the circumferential direction of the tunnel cross section can be mounted on the rock wall 8. In this case, in a manner known per se, individual arch-shaped carrier elements are firmly connected to one another in the circumferential direction at their ends to form a supporting arch. You can get a firm bond with the rock wall 8 by anchor bolts 7 or they are held supported from the inside by a support mechanism, not shown, until the concrete is solidified. This work is made considerably easier by its low weight in relation to its strength. Another advantage is that, due to their strength and structure, they can be used not only for inclusion in shotcrete, but also as a support for formwork and reinforcement elements to absorb the loads that occur when the formwork is backfilled.

Diese Vorteile werden dadurch erreicht, dass die aus Rundstahlmaterial gebildete Gittergrundstruktur in begrenztem Mass mit einem Walzprofil kombiniert wird, das aus einem Hohlprofil mit einem hohen Widerstandsmoment besteht.These advantages are achieved in that the lattice base structure formed from round steel material is combined to a limited extent with a rolled profile which consists of a hollow profile with a high section modulus.

Gemäss den Ausführungsbeispielen der Fig. 1 bis 4 ist der äussere, der Felswand 8 zugekehrte Gurtstab 9 aus einem im Querschnitt bogenförmigen Stahlblech geformt, so dass seine Aussenseite abgerundet ist und seine Querschnittsschenkel 10,11 eine Fortsetzung der dreieckigen Querschnittsform des Gitterträgers bilden. Entsprechend verlaufen auch die diesen Gurtstab 9 mit den beiden inneren Gurtstäben über Schweissstellen fest verbindenden Verstrebungselemente 13,14 in der gleichen Ebene wie dessen Querschnittsschenkel 10,11.According to the exemplary embodiments in FIGS. 1 to 4, the outer belt rod 9 facing the rock wall 8 is formed from a steel sheet which is curved in cross section, so that its outside is rounded and its cross-sectional legs 10, 11 form a continuation of the triangular cross-sectional shape of the lattice girder. Correspondingly, the strut elements 13, 14 that connect this belt bar 9 with the two inner belt bars via welding points also run in the same plane as its cross-sectional leg 10, 11.

Die Querschnittsgrösse des den Hohlquerschnitt aufweisenden äusseren Gurtstabes 9 ist unter Berücksichtigung der verhältnismässig grossen Blechdicke so gewählt, dass der statische Schwerpunkt in der Mitte des Trägerquerschnittes liegt. In Uebereinstimmung mit den dargestellten Ausführungsbeispielen liegt somit die Länge des geradlinigen Teils der Querschnittsschenkel des äusseren Gurtstabes 9 im Bereich von 20 bis 40% der geraden Seitenlänge des Trägerquerschnittes.The cross-sectional size of the outer belt rod 9 having the hollow cross-section is selected taking into account the relatively large sheet thickness so that the static center of gravity lies in the middle of the cross-section of the beam. In accordance with the illustrated embodiments, the length of the straight part of the cross-sectional leg of the outer belt rod 9 is in the range of 20 to 40% of the straight side length of the cross section of the beam.

Die Verstrebungselemente 13,14 bestehen entweder aus einzelnen, in Trägerlängsrichtung zu den Gurtstäben 9,16,17 geneigten Rundstahlstäben oder sie sind aus einem Strangmaterial wellen-oder zick-zackförmig gebogen, so dass sie in dieser Form zwischen den Gurtstäben 9,16 bzw. 9,17 hin und herlaufen, wie durch die FR-A-1.098.003 an sich bekannt ist.The strut elements 13, 14 either consist of individual round steel bars inclined in the longitudinal direction of the girder bars 9, 16, 17 or they are bent from a strand material in a wave or zigzag shape, so that they are in this form between the belt bars 9, 16 or 9.17 back and forth, as is known per se from FR-A-1.098.003.

Für die Verbindung der beiden inneren Gurtstäbe 16,17 miteinander zu einer stabilen Dreiecksform des Trägerquerschnittes sind in regelmässigen Abständen einzelne Verstrebungselemente 19-21 vorgesehen, die senkrecht zu den Gurtstäben 16,17 verlaufen und diese von der Innenseite des Trägerquerschnittes her bügelartig umfassen. Dabei können die abgebogenen Enden 23 der Verstrebungselemente 19 vom Trägerquerschnitt weg nach aussen überstehen, um auf sie ein Armierungsgitter 24 aufzustecken. Durch anschliessendes Umbiegen dieser beiden Enden 23 in Richtung gegeneinander entsprechend der Strichliniendarstellung 23′ wird das Armierungsgitter 24 am Gitterträger 2 befestigt. Der rechte untere Teil der Querschnittsdarstellung der Fig. 2 zeigt ein Ausführungsbeispiel, bei dem die Verstrebungselemente 19 die Gurtstäbe 16,17 in Form eines flachen Ringes umschliessen.For the connection of the two inner belt bars 16, 17 to one another to form a stable triangular shape of the beam cross section, individual strut elements 19-21 are provided at regular intervals, which run perpendicular to the belt bars 16, 17 and enclose them in a bow-like manner from the inside of the beam cross section. The bent ends 23 of the strut elements 19 can protrude outward from the cross-section of the beam in order to attach a reinforcement grid 24 to them. By subsequently bending these two ends 23 towards each other in accordance with the dashed line representation 23 ', the reinforcing mesh 24 is attached to the lattice girder 2. The lower right part of the cross-sectional view of FIG. 2 shows an embodiment in which the strut elements 19 enclose the belt bars 16, 17 in the form of a flat ring.

Für die Anwendung des Gitterträgers 2 als Betonschalungsträger sind entsprechend den Darstellungen der Fig. 1, 3, 5 und 6 an den die inneren Gurtstäbe 16,17 verbindenden Verstrebungselementen 19 Schalungs- und Armierungsgitter 26 befestigt, die aus einer Kombination von grobmaschigem Trägergitter und feinmaschigem Schalungsgitter bestehen. Um die Lücken zwischen auf diese Weise ausgerüsteten und in Tunnellängsrichtung aufeinanderfolgenden Gitterträgern 2 für eine geschlossene Schalung zu schliessen sind gesonderte Schalungs-und Armierungsgitter (27) vorgesehen, die in regelmässigen Abständen Verstrebungsbügel 28 aufweisen, deren hakenförmig abgebogenen Enden 29,30 über die gegenüberliegend angeordneten inneren Gurtstäbe 17,16 benachbarter Gitterträger 2 entsprechend der Darstelung der Fig. 5 einhakbar sind.For the use of the lattice girder 2 as a concrete formwork girder, formwork and reinforcement grids 26 are attached to the strut elements connecting the inner belt rods 16, 17, as shown in FIGS. 1, 3, 5 and 6, which are made from a combination of coarse-mesh girder lattice and fine-mesh formwork lattice consist. In order to close the gaps between lattice girders 2 equipped in this way and successive in the longitudinal direction of the tunnel for a closed formwork, separate formwork and reinforcement lattices (27) are provided, which have strut brackets 28 at regular intervals, the hook-shaped bent ends 29, 30 of which are arranged opposite one another inner straps 17, 16 of adjacent lattice girders 2 can be hooked in as shown in FIG. 5.

Um die Gefahr einer Spritzschattenbildung bzw. von Hohlräumen im Spritzbeton weiter zu verringern, kann der vorzugsweise äussere, der Felswand zugekehrte Gurtstab 32 oder zwei äussere Gurtstäbe 33, 34 als durchlöchertes Rohr ausgeführt sein, das mit einem aus der Betonauskleidung 35 nach innen herausragenden Füllstutzen 36,37 für ein Zementgemisch verbunden ist. Durch Einpressen von eines Injektionsmaterials, d.h. eines Zementgemisches in den oder die rohrförmigen Gurtstäbe 32-34 werden diese gefüllt, so dass sich ihre Festigkeit erhöht. Ausserdem wird das Injektionsmaterial durch zahlreiche Löcher 38,39 in die umgebende Spritzbetonmasse gepresst, so dass durch Spritzschattenbildung verbliebene Hohlräume ausgefüllt werden und durch einen kraftschlüssigen Verbund mit der Felswand 8 ein Betontraggewölbe erhöhter Qualität entsteht. Eine Verschlusskappe 50 verhindert nach Fertigstellung das Zurückfliessen von Betonmasse.In order to further reduce the risk of spray shadow formation or voids in the shotcrete, the preferably outer belt rod 32 facing the rock face or two outer belt rods 33, 34 can be designed as a perforated tube which has a filler neck 36 protruding inwards from the concrete lining 35 , 37 is connected for a cement mixture. By injecting an injection material, i.e. a cement mixture in the or the tubular belt rods 32-34, these are filled so that their strength increases. In addition, the injection material is pressed through numerous holes 38, 39 into the surrounding shotcrete mass, so that voids remaining through the formation of splash shadows are filled and a concrete supporting arch of increased quality is created by a force-fitting connection with the rock wall 8. A closure cap 50 prevents concrete mass from flowing back after completion.

Die zwei äusseren und zwei inneren Gurtstäbe 33, 34, 40, 41 der Ausführungsform des Gitterträgers 6 gemäss Fig. 9 sind in vier Querschnittsrichtungen durch in zwei diagonalen und zwei zueinander parallelen Ebenen verlaufende Verstrebungselemente 42 bis 45 miteinander verbunden. Zum Auspressen der beiden äusseren rohrförmigen Gurtstäbe 33,34 hat der Füllstutzen 37 in v-förmiger Anordnung zwei Abzweigungen 47,48.The two outer and two inner belt rods 33, 34, 40, 41 of the embodiment of the lattice girder 6 according to FIG. 9 are connected to one another in four cross-sectional directions by strut elements 42 to 45 running in two diagonal and two mutually parallel planes. To squeeze out the two outer tubular belt bars 33, 34, the filler neck 37 has two branches 47, 48 in a V-shaped arrangement.

Claims (10)

Gitterträger für Betonauskleidungen an Felswänden, mit mindestens drei Gurtstäben (9,16,17,32,33,34,40,41), die durch Verstrebungselemente (13,14,19,42-45) starr zu einem Dreiecks-oder Vierecksquerschnitt miteinander verbunden sind, dadurch gekennzeichnet, dass mindestens ein der Felswand zuzukehrender äusserer Gurtstab (9,32,33,34) ein Hohlprofil aufweist, wobei der von dem Hohlprofil umschlossene Raum grösser ist als die Querschnittsgrösse der anderen Gurtstäbe (16,17,40,41).Lattice girders for concrete linings on rock walls, with at least three belt bars (9,16,17,32,33,34,40,41), which by means of strut elements (13,14,19,42-45) rigid to a triangular or square cross-section with each other are connected, characterized in that at least one outer belt rod (9, 32, 33, 34) facing the rock wall has a hollow profile, the space enclosed by the hollow profile being larger than the cross-sectional size of the other belt rods (16, 17, 40, 41 ). Gitterträger nach Anspruch 1, dadurch gekennzeichnet, dass das Hohlprofil eines äusseren Gurtstabes (9) rinnenförmig ist, wobei dessen Querschnittsschenkel zu zwei inneren Gurtstäben (16,17) hinweisen.Lattice girder according to claim 1, characterized in that the hollow profile of an outer belt rod (9) is channel-shaped, its cross-sectional leg pointing to two inner belt rods (16, 17). Gitterträger nach Anspruch 1, dadurch gekennzeichnet, dass der mindestens eine das Hohlprofil aufweisende Gurtstab (32,33,34) rohrförmig ist.Lattice girder according to claim 1, characterized in that the at least one belt rod (32, 33, 34) having the hollow profile is tubular. Gitterträger nach Anspruch 1 bis 3, dadurch gekennzeichnet, dass die die inneren Gurtstäbe (16,17,40,41) mit einem das Hohlprofil aufweisenden äusseren Gurtstab (9,32,33,34) verbindenden Verstrebungselemente (13,14,42-45) wellen- oder zickzackförmig angeordnet sind.Lattice girder according to Claims 1 to 3, characterized in that the strut elements (13, 14, 42-45) connecting the inner belt rods (16, 17, 40, 41) with an outer belt rod (9, 32, 33, 34) having the hollow profile ) are arranged in a wave or zigzag shape. Gitterträger nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass an den die inneren Gurtstäbe (16,17) miteinander verbindenden Verstrebungselementen (19) Schalungs-und Armierungsgitter (26) befestigt sind.Lattice girder according to one of claims 1 to 4, characterized in that formwork and reinforcement grids (26) are fastened to the strut elements (19) connecting the inner belt rods (16, 17). Gitterträger nach Anspruch 5, dadurch gekennzeichnet, dass mindestens einige von einzelnen Quergerichteten Verstrebungselementen (19) in Form von u-förmigen Bügeln die inneren Gurtstäbe (16,17) von der Innenseite des Gitterträgerquerschnitts her umfassen.Lattice girder according to claim 5, characterized in that at least some of the individual transverse strut elements (19) in the form of U-shaped brackets encompass the inner belt bars (16, 17) from the inside of the lattice girder cross section. Gitterträger nach Anspruch 6, dadurch gekennzeichnet, dass die u-förmigen Bügel über den Gitterträgerquerschnitt nach aussen überstehende Enden (23) aufweisen, die zur Aufnahme von aufzusteckenden Schalungs-und Armierungsgittern und anschliessendem hakenförmigen Umbiegen bestimmt sind.Lattice girder according to claim 6, characterized in that the U-shaped brackets have outwardly projecting ends (23) over the lattice girder cross section, which are intended for receiving formwork and reinforcement grids to be clipped on and subsequent hook-shaped bending. Gitterträger nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass in dem das Hohlprofil aufweisenden Gurtstab (9) Bohrungen zur Aufnahme von Ankerbolzen (7) vorgesehen sind, die den Gitterträger an der Felswand (8) halten.Lattice girder according to one of claims 1 to 7, characterized in that bores for receiving anchor bolts (7) are provided in the belt rod (9) which hold the hollow profile and hold the lattice girder on the rock wall (8). Gitterträger nach einem der Ansprüche 3 bis 8, dadurch gekennzeichnet, dass an den mindestens einen rohrförmigen Gurtstab (32,33,34) ein Füllstutzen (36,37) angeschlossen ist und in diesem Gurtstab zahlreiche Austrittsöffnungen (38,39) zum Ausfüllen von durch Spritzschatten entstandenen Hohlräumen vorgesehen sind.Lattice girder according to one of claims 3 to 8, characterized in that a filler neck (36,37) is connected to the at least one tubular belt rod (32,33,34) and in this belt rod numerous outlet openings (38,39) for filling through Splash shadow created cavities are provided. Schalungs- und Armierungsgitter für die Verbindung von nebeneinander verlaufenden Gitterträgern (2) nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Schalungs-und Armierungsgitter ( ) auf der Aussenseite von mehreren Bügeln (28) befestigt sind, deren abgebogene Enden (29,30) zum Umfassen der inneren Gurtstäbe (16,17) der nebeneinander verlaufenden Gitterträger (2) bestimmt sind.Formwork and reinforcement grids for the connection of lattice girders (2) running side by side according to one of claims 1 to 9, characterized in that the formwork and reinforcement grids () are fastened to the outside of a plurality of brackets (28) whose bent ends (29 , 30) are intended to enclose the inner belt rods (16, 17) of the lattice girders (2) running next to one another.
EP90810994A 1989-12-29 1990-12-17 Lattice girder for concrete cover Withdrawn EP0435823A1 (en)

Applications Claiming Priority (2)

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CH4676/89 1989-12-29
CH467689A CH680379A5 (en) 1989-12-29 1989-12-29

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EP0435823A1 true EP0435823A1 (en) 1991-07-03

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EP90810994A Withdrawn EP0435823A1 (en) 1989-12-29 1990-12-17 Lattice girder for concrete cover

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2791074A1 (en) * 1999-03-19 2000-09-22 Desquenne & Giral Coffering frame and arch and procedure for making concrete facing comprises coffering and connecting frames comprising trellis for supporting canvas
CN106640146A (en) * 2017-03-07 2017-05-10 安徽理工大学 Three-dimensional steel bar net rack and concrete combined lining structure

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR75216E (en) * 1958-08-04 1961-05-12 Improvements to composite metal joists for reinforced concrete floors
CH356582A (en) * 1959-02-20 1961-08-31 Anderegg Ernst Lattice girder
DE1484111A1 (en) * 1963-02-12 1969-01-09 Bau Ingenieurbuero Dipl Ing Wi Steel light carrier
DE1559459A1 (en) * 1964-05-04 1970-03-05 Ainedter Ing Othmar Rigid reinforcement element for reinforced concrete components
DE2427168A1 (en) * 1974-06-05 1975-12-11 Julius Georg Stefan Dip Keller Lost formwork concrete-slab-reinforcing lattice girder - upper chord open edge sections bent into channel opening
CH615728A5 (en) * 1977-02-14 1980-02-15 Amberg Rudolf Supporting and securing arrangement in cavities, hard headings or on rock sections
EP0027896A2 (en) * 1979-10-30 1981-05-06 Kaiser-Omnia Bausysteme Vertriebsgesellschaft mbH Rigid prefabricated panel element and method for its fabrication
DE3236569A1 (en) * 1982-10-02 1984-04-05 Ruhrkohle Ag, 4300 Essen Composite support system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR75216E (en) * 1958-08-04 1961-05-12 Improvements to composite metal joists for reinforced concrete floors
CH356582A (en) * 1959-02-20 1961-08-31 Anderegg Ernst Lattice girder
DE1484111A1 (en) * 1963-02-12 1969-01-09 Bau Ingenieurbuero Dipl Ing Wi Steel light carrier
DE1559459A1 (en) * 1964-05-04 1970-03-05 Ainedter Ing Othmar Rigid reinforcement element for reinforced concrete components
DE2427168A1 (en) * 1974-06-05 1975-12-11 Julius Georg Stefan Dip Keller Lost formwork concrete-slab-reinforcing lattice girder - upper chord open edge sections bent into channel opening
CH615728A5 (en) * 1977-02-14 1980-02-15 Amberg Rudolf Supporting and securing arrangement in cavities, hard headings or on rock sections
EP0027896A2 (en) * 1979-10-30 1981-05-06 Kaiser-Omnia Bausysteme Vertriebsgesellschaft mbH Rigid prefabricated panel element and method for its fabrication
DE3236569A1 (en) * 1982-10-02 1984-04-05 Ruhrkohle Ag, 4300 Essen Composite support system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2791074A1 (en) * 1999-03-19 2000-09-22 Desquenne & Giral Coffering frame and arch and procedure for making concrete facing comprises coffering and connecting frames comprising trellis for supporting canvas
CN106640146A (en) * 2017-03-07 2017-05-10 安徽理工大学 Three-dimensional steel bar net rack and concrete combined lining structure
CN106640146B (en) * 2017-03-07 2020-02-07 安徽理工大学 Three-dimensional reinforced bar net frame and concrete combined lining structure

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