EP3733975B1 - Reinforcing cage and method for producing a slotted wall - Google Patents

Reinforcing cage and method for producing a slotted wall Download PDF

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Publication number
EP3733975B1
EP3733975B1 EP19172482.2A EP19172482A EP3733975B1 EP 3733975 B1 EP3733975 B1 EP 3733975B1 EP 19172482 A EP19172482 A EP 19172482A EP 3733975 B1 EP3733975 B1 EP 3733975B1
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EP
European Patent Office
Prior art keywords
diaphragm wall
reinforcement cage
trench
glass fiber
rods
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EP19172482.2A
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German (de)
French (fr)
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EP3733975A1 (en
Inventor
Gustav Jahnert
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Bauer Spezialtiefbau GmbH
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Bauer Spezialtiefbau GmbH
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Priority to EP19172482.2A priority Critical patent/EP3733975B1/en
Priority to PCT/EP2020/057291 priority patent/WO2020224841A1/en
Publication of EP3733975A1 publication Critical patent/EP3733975A1/en
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/13—Foundation slots or slits; Implements for making these slots or slits
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/18—Bulkheads or similar walls made solely of concrete in situ
    • E02D5/187—Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal

Definitions

  • the invention relates to a reinforcement cage for a diaphragm wall panel, which is essentially quadrangular in cross section with a broad side and a narrow side, the reinforcement cage having reinforcement rods assembled in a grid-like manner, according to the preamble of claim 1.
  • the invention also relates to a method for producing a diaphragm wall in the ground from individual diaphragm wall panels, a slot being created in the ground which is filled with a hardenable compound, with a reinforcing cage being inserted into the slot before, during or after filling with the hardenable compound is, according to the preamble of claim 7.
  • Milling the primary diaphragm wall panels can lead to increased wear on the cutting wheels of the diaphragm wall cutter.
  • the creation of the secondary diaphragm wall panels is carried out in particular when the hardenable mass of the primary diaphragm wall panels has sufficiently hardened, but has not yet fully hardened.
  • Significant wear on the milling wheels can occur, however, if the steel reinforcement cage protrudes into the overlapping area of the diaphragm wall panels and is thus milled by the milling wheels.
  • the contact of the cutting teeth and the cutting wheels made of metal with the steel reinforcement cage leads to a very considerable wear, especially on the cutting teeth.
  • a generic reinforcement basket is from the CN 205 399 399 U out.
  • a lattice structure of the reinforcement cage is formed in a side area by glass fiber rods.
  • spacers for reinforcement cages From the WO 2019/063965 A1 are known spacers for reinforcement cages.
  • the spacer elements have contact plates which bear against a side wall of a slot and are connected to an inner reinforcement cage via connecting rods.
  • the connecting rods may be formed from a glass fiber reinforced material for ease of machinability.
  • the invention is based on the object of specifying a reinforcement cage for a diaphragm wall panel and a method for producing a diaphragm wall in the ground, with which efficient production of a diaphragm wall with high strength can be achieved with little wear on the diaphragm wall device.
  • the reinforcing cage is formed with glass fiber rods at least in a side region which is assigned to one of the narrow sides of the diaphragm wall panel.
  • the invention is based on the finding that glass fiber rods in a hardened filling compound of a diaphragm wall panel, in particular in a concrete compound, represent excellent reinforcement, which is comparable to reinforcement made of steel rods.
  • glass fiber rods can easily be milled and milled over by the metallic milling teeth of a trench cutter and with relatively little wear on the milling teeth.
  • a reinforcing cage can be arranged over a relatively large area of the cross section of a diaphragm wall panel. This increases the strength of a diaphragm wall panel and hence the overall strength of a diaphragm wall so formed.
  • the reinforcement basket can be made up entirely of glass fiber rods as reinforcement rods.
  • the reinforcement basket has a lattice-like base body which is formed with steel reinforcement rods, and that at least one side area with the glass fiber rods is arranged on the base body.
  • the base body It is particularly preferred that two side areas with glass fiber struts are arranged on the base body.
  • the side areas are aligned with the narrow sides of the diaphragm wall panel to be created.
  • the side areas with the base body can have the same size in the longitudinal or width direction of the diaphragm wall panel. This size is preferably less than the widthwise length of the intended slotted wall panel.
  • the reinforcement cage with the two side areas Glass fiber rods has at least the length of the slot in the width direction. Due to a certain elasticity of the glass fiber rods, the reinforcement basket can even be larger in the width direction, whereby it then adapts flexibly to the existing side walls of the slot. As a result, a particularly reliable centering of the reinforcement cage in the slot and thus in the slot wall panel can take place. Correct surrounding reinforcement is beneficial to the strength of the diaphragm wall panel to be formed.
  • the two side areas extend up to the edge of the narrow sides of the diaphragm wall panel to be formed and form a spacer or centering element.
  • the invention provides that at least individual glass fiber rods extend in the longitudinal direction of the reinforcement cage with an outwardly directed convex arc shape in the side area.
  • This arc shape is designed in such a way that it tapers at least downwards and possibly also upwards, while there is a maximum width in the width direction of the reinforcement cage in a central area.
  • the reinforcement cage can be easily inserted into the slot and the reinforcement cage can thus be reliably centered due to this partially conical or tapering design.
  • an elastic property of the design of the side areas is supported by this curved shape of the lateral glass fiber rods in the longitudinal direction.
  • the glass fiber rods are fastened to the base body so that they can be deflected.
  • the deflectable attachment can take place, for example, by means of straps or wires on the metal reinforcement basket.
  • the connection point formed in this way allows increased mobility of the glass fiber rods.
  • the invention includes a trench wall panel in the ground, which is characterized in that it is formed with one of the previously described reinforcing cages according to the invention.
  • the diaphragm wall panel is made of a hardenable mass, in particular with concrete, if necessary with the involvement of Milled ground material is formed, with the reinforcement basket being inserted into the slot in the ground before the mass hardens.
  • the invention includes a slot wall in the ground, which is formed from a plurality of slot wall panels adjoining one another, with at least one slot wall panel being provided with a reinforcing cage according to the invention.
  • the reinforcing cages according to the invention can preferably only be provided in the primary diaphragm wall panels, between which the secondary diaphragm wall panels then take place by milling the previously produced and solidified primary diaphragm wall panels to form the diaphragm wall.
  • the reinforcing cages according to the invention can also be provided in all diaphragm wall panels, which facilitates logistics on the construction site.
  • the simplified milling of the primary diaphragm wall panels when creating a diaphragm wall also allows the primary diaphragm wall panels to be created with an increased tolerance. This can help reduce the cost of a construction project.
  • the invention is characterized in that a previously described reinforcement cage according to the invention is inserted into the trench.
  • a preferred embodiment of the method according to the invention consists in first creating two spaced-apart primary diaphragm wall panels in the ground, with a reinforcing cage with glass fiber rods being used in at least one slot for one of the primary diaphragm wall panels, and then cutting a slot for a secondary diaphragm wall panel between two primary diaphragm wall panels Milling is created, with side areas of the primary diaphragm wall panels and fiberglass rods arranged therein being at least partially milled.
  • the cutting teeth of the cutting wheels of a trench wall cutter provided for this purpose only become relatively small during the cutting of glass fiber rods that may protrude into the overlapping area to be cut off Exposed wear, which is in any case significantly lower than wear, which would occur when milling metal reinforcing rods.
  • the single drawing shows a slot 7 in the base 5 in a partially cut cross-sectional view.
  • the slot 7 is designed with a rectangular cross-section with two narrow sides 8 and two broad sides 9 running parallel to the plane of the drawing.
  • a reinforcing cage 10 according to the invention is inserted into this slot 7, which typically has a depth of between 10 m and 30 m or deeper.
  • the reinforcement basket 10 has an approximately cuboid base body 11 which is constructed of reinforcement rods 12 in the manner of a grid. Of the reinforcing rods 12, the reinforcing rods 12 running in the longitudinal direction of the slot 7 are shown in the drawing, which are connected via horizontal or transverse transverse rods, not shown in detail, preferably by welding.
  • fiberglass rods 20 running in the longitudinal direction are mounted, which form the lateral outer area of the reinforcement cage 10.
  • the fiberglass rods 20 running in the longitudinal direction are designed with a convex arc shape, which facilitates the insertion of the reinforcement cage 10 into the slot 7, which is filled with a hardenable suspension, not shown here, in particular a concrete suspension, to form a diaphragm wall panel in the slot 7.
  • the bent fiberglass rods 20 running in the longitudinal direction are attached to the reinforcing rods 12 of the base body 11 via transverse supports 22 in such a way that they are fixed or deflectable or displaceable in a transverse direction.
  • the glass fiber rods 20 can reach up to the narrow sides 8 of the slot 7 when the reinforcement basket 10 is inserted into the slot 7 .
  • the slot wall panel created in slot 7 be milled in an edge area, with a milling of the glass fiber rods 20 by the metal milling wheels of the trench wall cutters is easily possible.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Description

Die Erfindung betrifft einen Armierungskorb für ein Schlitzwandpanel, welches im Querschnitt im Wesentlichen viereckig mit einer Breitseite und einer Schmalseite ist, wobei der Armierungskorb gitterartig zusammengesetzte Armierungsstäbe aufweist, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a reinforcement cage for a diaphragm wall panel, which is essentially quadrangular in cross section with a broad side and a narrow side, the reinforcement cage having reinforcement rods assembled in a grid-like manner, according to the preamble of claim 1.

Die Erfindung betrifft weiterhin ein Verfahren zum Herstellen einer Schlitzwand im Boden aus einzelnen Schlitzwandpaneelen, wobei ein Schlitz im Boden erstellt wird, welcher mit einer aushärtbaren Masse verfüllt wird, wobei vor, bei oder nach dem Verfüllen mit der aushärtbaren Masse ein Armierungskorb in den Schlitz eingesetzt wird, gemäß dem Oberbegriff des Anspruchs 7.The invention also relates to a method for producing a diaphragm wall in the ground from individual diaphragm wall panels, a slot being created in the ground which is filled with a hardenable compound, with a reinforcing cage being inserted into the slot before, during or after filling with the hardenable compound is, according to the preamble of claim 7.

Verfahren zum Herstellen von Schlitzwänden im Boden sind seit langem bekannt. Mittels einer Schlitzwandfräse oder eines Schlitzwandgreifers werden zunächst in einem definierten Abstand zueinander primäre Schlitzwandpaneele erstellt. Dies wird dadurch erreicht, dass ein ausgehobener Schlitz mit einer aushärtbaren Masse verfüllt wird, welche im Boden zu einem festen Schlitzwandpaneel aushärtet. Vor dem Aushärten wird zum Erreichen einer geforderten Festigkeit üblicherweise ein gitterartiger Armierungskorb aus Stahl eingesetzt. Nach dem Erstellen der primären Schlitzwandpaneele wird in dem jeweils dazwischen liegenden Zwischenraum ein sekundäres Schlitzwandpaneel erstellt. Dies erfolgt üblicherweise mittels einer Schlitzwandfräse, wobei der Abstand zwischen den nebeneinander liegenden primären Schlitzwandpaneelen so gewählt ist, dass die Fräsräder der Schlitzwandfräse die seitlich angrenzenden Schmalseiten anfräsen. Hierdurch kann eine besonders gute Verbindung zwischen den primären und den sekundären Schlitzwandpaneelen erreicht werden, um insbesondere eine gegen Durchtritt von Grundwasser dichte Schlitzwand zu bilden.Methods for producing diaphragm walls in the ground have been known for a long time. Using a diaphragm wall cutter or a diaphragm wall grab, primary diaphragm wall panels are first created at a defined distance from one another. This is achieved by filling an excavated slot with a hardenable compound, which hardens in the ground to form a solid slot wall panel. Before curing, a lattice-like reinforcement cage made of steel is usually used to achieve the required strength. After the primary diaphragm wall panels have been created, a secondary diaphragm wall panel is created in the space between them. This is usually done by means of a trench wall cutter, with the distance between the adjacent primary trench wall panels being selected in such a way that the cutting wheels of the trench wall cutter mill the laterally adjoining narrow sides. In this way, a particularly good connection can be achieved between the primary and the secondary diaphragm wall panels, in order in particular to form a diaphragm wall that is impervious to the passage of groundwater.

Das Anfräsen der primären Schlitzwandpaneele kann zu einem erhöhten Verschleiß an den Fräsrädern der Schlitzwandfräse führen. Um Verschleiß zu reduzieren, wird das Erstellen der sekundären Schlitzwandpaneele insbesondere dann durchgeführt, wenn die aushärtbare Masse der primären Schlitzwandpaneele hinreichend verfestigt, jedoch noch nicht vollständig ausgehärtet ist. Ein erheblicher Verschleiß an den Fräsrädern kann sich jedoch dann einstellen, wenn der Armierungskorb aus Stahl in den überlappenden Bereich der Schlitzwandpaneele hineinragt und somit durch die Fräsräder angefräst wird. Der Kontakt der Fräszähne und der Fräsräder aus Metall mit dem Armierungskorb aus Stahl führt zu einem ganz erheblichen Verschleiß insbesondere an den Fräszähnen.Milling the primary diaphragm wall panels can lead to increased wear on the cutting wheels of the diaphragm wall cutter. In order to reduce wear, the creation of the secondary diaphragm wall panels is carried out in particular when the hardenable mass of the primary diaphragm wall panels has sufficiently hardened, but has not yet fully hardened. Significant wear on the milling wheels can occur, however, if the steel reinforcement cage protrudes into the overlapping area of the diaphragm wall panels and is thus milled by the milling wheels. The contact of the cutting teeth and the cutting wheels made of metal with the steel reinforcement cage leads to a very considerable wear, especially on the cutting teeth.

Aus der EP 1 741 837 A1 ist ein Verfahren zum Herstellen einer Schlitzwand bekannt, bei welchem Abstandselemente vorgesehen werden, durch welche die Bewehrungskörbe innerhalb des Schlitzes geführt und so möglichst exakt positioniert werden können. Trotz einer solchen Führung besteht insbesondere bei relativ tiefen Schlitzwandpaneelen mit zunehmender Schlitztiefe die Gefahr, dass Armierungskörbe doch in den überlappenden Bereich geraten können.From the EP 1 741 837 A1 a method for producing a trench wall is known, in which spacer elements are provided, through which the reinforcement cages can be guided within the trench and thus positioned as precisely as possible. Despite such a guide, there is a risk, particularly in the case of relatively deep slot wall panels with increasing slot depth, that reinforcing cages can nevertheless end up in the overlapping area.

Weiterhin ist es aus der EP 2 553 175 B1 bekannt, zur Verminderung der notwendigen Verfüllmasse in Seitenbereichen eines Bewehrungskorbes Abstandselemente aus einem weicheren Füllmaterial vorzusehen, welche ohne Weiteres angefräst werden können. Diese relativ großvolumigen Füll- oder Hohlkörper bringen jedoch gezielt weicheres Fremdmaterial in das zu bildende Schlitzwandpaneel ein, was sich negativ auf die Gesamtfestigkeit und die Dichtigkeit der zu erstellenden Schlitzwand auswirken kann. Zudem besteht bei einer nicht zentrischen Positionierung eines Armierungskorbes mit den seitlichen Füllkörpern das Problem, dass in einem Bereich ein Füllkörper nicht oder nur teilweise abgetragen wird, so dass sich in einem solchen Fall eine für die Gesamtfunktion der Schlitzwand nachteilige Fehlstelle ausbilden kann.Furthermore, it is from the EP 2 553 175 B1 known to provide spacer elements made of a softer filling material to reduce the necessary filling compound in the side areas of a reinforcement cage, which can be easily milled. However, these relatively large-volume filling or hollow bodies introduce softer foreign material in a targeted manner into the diaphragm wall panel to be formed, which can have a negative effect on the overall strength and the tightness of the diaphragm wall to be created. In addition, if a reinforcement cage is not positioned centrally with the lateral filling bodies, there is the problem that a filling body is not or only partially removed in one area, so that in such a case a defect can form that is disadvantageous for the overall function of the trench wall.

Ein gattungsgemäßer Armierungskorb geht aus der CN 205 399 399 U hervor. Eine Gitterstruktur des Armierungskorbes wird in einem Seitenbereich durch Glasfaserstäbe gebildet.A generic reinforcement basket is from the CN 205 399 399 U out. A lattice structure of the reinforcement cage is formed in a side area by glass fiber rods.

Aus der WO 2019/063965 A1 sind Abstandselemente für Armierungskörbe bekannt. Die Abstandselemente weisen Anlageplatten auf, welche an einer Seitenwand eines Schlitzes anliegen und über Verbindungsstäbe mit einem Inneren Armierungskorb verbunden sind. Die Verbindungsstäbe können zur leichteren Bearbeitbarkeit aus einem glasfaserverstärkten Material gebildet sein.From the WO 2019/063965 A1 are known spacers for reinforcement cages. The spacer elements have contact plates which bear against a side wall of a slot and are connected to an inner reinforcement cage via connecting rods. The connecting rods may be formed from a glass fiber reinforced material for ease of machinability.

Der Erfindung liegt die Aufgabe zugrunde, einen Armierungskorb für ein Schlitzwandpaneel und ein Verfahren zum Herstellen einer Schlitzwand im Boden anzugeben, mit welcher eine effiziente Herstellung einer Schlitzwand mit hoher Festigkeit bei einem geringen Verschleiß des Schlitzwandgerätes erzielt werden kann.The invention is based on the object of specifying a reinforcement cage for a diaphragm wall panel and a method for producing a diaphragm wall in the ground, with which efficient production of a diaphragm wall with high strength can be achieved with little wear on the diaphragm wall device.

Die Aufgabe wird zum einen durch einen Armierungskorb mit den Merkmalen des Anspruchs 1 und zum anderen durch ein Verfahren mit den Merkmalen des Anspruchs 7 gelöst. Bevorzugte Ausführungsformen der Erfindung sind in den abhängigen Ansprüchen angegeben.The object is achieved on the one hand by a reinforcement cage having the features of claim 1 and on the other hand by a method having the features of claim 7 . Preferred embodiments of the invention are given in the dependent claims.

Bei dem erfindungsgemäßen Armierungskorb ist vorgesehen, dass dieser zumindest in einem Seitenbereich, welcher einer der Schmalseiten des Schlitzwandpaneels zugeordnet ist, mit Glasfaserstäben ausgebildet ist.In the case of the reinforcing cage according to the invention, it is provided that it is formed with glass fiber rods at least in a side region which is assigned to one of the narrow sides of the diaphragm wall panel.

Die Erfindung beruht dabei auf der Erkenntnis, dass Glasfaserstäbe in einer ausgehärteten Verfüllmasse eines Schlitzwandpaneels, insbesondere in einer Betonmasse, eine hervorragende Armierung darstellen, welche vergleichbar mit einer Armierung aus Stahlstäben ist. Im Gegensatz zu Stahlstäben können jedoch Glasfaserstäbe durch die metallischen Fräszähne einer Schlitzwandfräse ohne Weiteres und mit einem relativ geringen Verschleiß an den Fräszähnen angefräst und überfräst werden.The invention is based on the finding that glass fiber rods in a hardened filling compound of a diaphragm wall panel, in particular in a concrete compound, represent excellent reinforcement, which is comparable to reinforcement made of steel rods. In contrast to steel rods, however, glass fiber rods can easily be milled and milled over by the metallic milling teeth of a trench cutter and with relatively little wear on the milling teeth.

Des Weiteren wird mit der Erfindung erzielt, dass über einen relativ großen Bereich des Querschnitts eines Schlitzwandpaneels ein Armierungskorb angeordnet sein kann. Dies erhöht die Festigkeit eines Schlitzwandpaneels und damit die Gesamtfestigkeit einer so gebildeten Schlitzwand.Furthermore, it is achieved with the invention that a reinforcing cage can be arranged over a relatively large area of the cross section of a diaphragm wall panel. This increases the strength of a diaphragm wall panel and hence the overall strength of a diaphragm wall so formed.

Grundsätzlich kann der Armierungskorb insgesamt aus Glasfaserstäben als Armierungsstäbe aufgebaut sein. Im Hinblick auf Kosten ist es jedoch nach einer Weiterbildung der Erfindung bevorzugt, dass der Armierungskorb einen gitterartigen Grundkörper aufweist, welcher mit Armierungsstäben aus Stahl gebildet ist, und dass an dem Grundkörper mindestens ein Seitenbereich mit den Glasfaserstäben angeordnet ist.In principle, the reinforcement basket can be made up entirely of glass fiber rods as reinforcement rods. With regard to costs, however, it is preferred according to a development of the invention that the reinforcement basket has a lattice-like base body which is formed with steel reinforcement rods, and that at least one side area with the glass fiber rods is arranged on the base body.

Besonders bevorzugt ist es, dass an dem Grundkörper zwei Seitenbereiche mit Glasfaserstreben angeordnet sind. Die Seitenbereiche sind dabei auf die Schmalseiten des zu erstellenden Schlitzwandpaneels ausgerichtet. Grundsätzlich können dabei die Seitenbereiche mit dem Grundkörper eine gleiche Größe in Längs- oder Breitenrichtung des Schlitzwandpaneels aufweisen. Diese Größe ist vorzugsweise kleiner als die Länge des vorgesehenen Schlitzwandpaneels in Breitenrichtung.It is particularly preferred that two side areas with glass fiber struts are arranged on the base body. The side areas are aligned with the narrow sides of the diaphragm wall panel to be created. In principle, the side areas with the base body can have the same size in the longitudinal or width direction of the diaphragm wall panel. This size is preferably less than the widthwise length of the intended slotted wall panel.

Besonders vorteilhaft für eine Zentrierung des Armierungskörpers in dem Schlitzwandpaneel ist, dass der Armierungskorb mit den zwei Seitenbereichen aus Glasfaserstäben mindestens die Länge des Schlitzes in Breitenrichtung aufweist. Durch eine gewisse Elastizität der Glasfaserstäbe kann der Armierungskorb sogar in Breitenrichtung größer sein, wobei sich dieser dann an die bestehenden Seitenwände des Schlitzes flexibel anpasst. Hierdurch kann eine besonders zuverlässige Zentrierung des Armierungskorbes in dem Schlitz und damit in dem Schlitzwandpaneel erfolgen. Eine korrekte umfassende Armierung ist vorteilhaft für die Festigkeit des zu bildenden Schlitzwandpaneels.It is particularly advantageous for centering the reinforcement body in the diaphragm wall panel that the reinforcement cage with the two side areas Glass fiber rods has at least the length of the slot in the width direction. Due to a certain elasticity of the glass fiber rods, the reinforcement basket can even be larger in the width direction, whereby it then adapts flexibly to the existing side walls of the slot. As a result, a particularly reliable centering of the reinforcement cage in the slot and thus in the slot wall panel can take place. Correct surrounding reinforcement is beneficial to the strength of the diaphragm wall panel to be formed.

Besonders vorteilhaft ist es nach einer Weiterbildung der Erfindung, dass sich die beiden Seitenbereiche bis an den Rand der Schmalseiten des zu bildenden Schlitzwandpaneels erstrecken und ein Abstands- oder Zentrierelement bilden.According to a development of the invention, it is particularly advantageous that the two side areas extend up to the edge of the narrow sides of the diaphragm wall panel to be formed and form a spacer or centering element.

Für ein besonders gutes und positionsgenaues Einbringen des Armierungskorbes ist es nach der Erfindung vorgesehen, dass in dem Seitenbereich zumindest einzelne Glasfaserstäbe sich in Längsrichtung des Armierungskorbes mit einer nach außen gerichteten konvexen Bogenform erstrecken. Diese Bogenform ist dabei so ausgebildet, dass diese sich zumindest nach unten hin und gegebenenfalls auch nach oben hin verjüngt, während eine maximale Breite in Breitenrichtung des Armierungskorbes in einem Mittenbereich gegeben ist. Durch diese zumindest teilweise Oval- oder Ellipsenform an den Außenbereichen kann der Armierungskorb durch diese bereichsweise konische oder sich verjüngende Gestaltung leicht in den Schlitz eingesetzt und so der Armierungskorb zuverlässig zentriert werden. Zudem wird durch diese Bogenform der seitlichen Glasfaserstäbe in Längsrichtung eine elastische Eigenschaft der Gestaltung der Seitenbereiche noch unterstützt.For a particularly good and precisely positioned insertion of the reinforcement cage, the invention provides that at least individual glass fiber rods extend in the longitudinal direction of the reinforcement cage with an outwardly directed convex arc shape in the side area. This arc shape is designed in such a way that it tapers at least downwards and possibly also upwards, while there is a maximum width in the width direction of the reinforcement cage in a central area. As a result of this at least partially oval or elliptical shape on the outer areas, the reinforcement cage can be easily inserted into the slot and the reinforcement cage can thus be reliably centered due to this partially conical or tapering design. In addition, an elastic property of the design of the side areas is supported by this curved shape of the lateral glass fiber rods in the longitudinal direction.

Dabei ist es erfindungsgemäß, dass die Glasfaserstäbe auslenkbar an dem Grundkörper befestigt sind. Die auslenkbare Anbringung kann etwa mittels Bändern oder Drähten an dem Armierungskorb aus Metall erfolgen. Die hierdurch gebildete Verbindungsstelle erlaubt eine erhöhte Bewegbarkeit der Glasfaserstäbe.It is in accordance with the invention that the glass fiber rods are fastened to the base body so that they can be deflected. The deflectable attachment can take place, for example, by means of straps or wires on the metal reinforcement basket. The connection point formed in this way allows increased mobility of the glass fiber rods.

Weiterhin umfasst die Erfindung ein Schlitzwandpaneel im Boden, welches dadurch gekennzeichnet ist, dass dieses mit einem der zuvor beschriebenen erfindungsgemäßen Armierungskörben gebildet ist. Das Schlitzwandpaneel ist dabei aus einer aushärtbaren Masse, insbesondere mit Beton, gegebenenfalls unter Einmischung des abgefrästen Bodenmateriales gebildet, wobei der Armierungskorb vor einem Aushärten der Masse in dem Schlitz im Boden eingesetzt ist.Furthermore, the invention includes a trench wall panel in the ground, which is characterized in that it is formed with one of the previously described reinforcing cages according to the invention. The diaphragm wall panel is made of a hardenable mass, in particular with concrete, if necessary with the involvement of Milled ground material is formed, with the reinforcement basket being inserted into the slot in the ground before the mass hardens.

Weiterhin umfasst die Erfindung eine Schlitzwand im Boden, welche aus mehreren, aneinander angrenzenden Schlitzwandpaneelen gebildet ist, wobei mindestens ein Schlitzwandpaneel mit einem erfindungsgemäßen Armierungskorb vorgesehen ist.Furthermore, the invention includes a slot wall in the ground, which is formed from a plurality of slot wall panels adjoining one another, with at least one slot wall panel being provided with a reinforcing cage according to the invention.

Vorzugsweise können die erfindungsgemäßen Armierungskörbe nur in den primären Schlitzwandpaneelen vorgesehen sein, zwischen denen zum Bilden der Schlitzwand dann die sekundären Schlitzwandpaneele durch Anfräsen der zuvor hergestellten und verfestigten primären Schlitzwandpaneele erfolgt. Grundsätzlich können aber in allen Schlitzwandpaneelen auch die erfindungsgemäßen Armierungskörbe vorgesehen sein, was die Logistik an der Baustelle erleichtert. Durch das vereinfachte Anfräsen der primären Schlitzwandpaneele beim Erstellen einer Schlitzwand erlaubt dies auch eine Erstellung der primären Schlitzwandpaneele mit einer erhöhten Toleranz. Dies kann zu einer Kostensenkung bei einem Bauvorhaben beitragen.The reinforcing cages according to the invention can preferably only be provided in the primary diaphragm wall panels, between which the secondary diaphragm wall panels then take place by milling the previously produced and solidified primary diaphragm wall panels to form the diaphragm wall. In principle, however, the reinforcing cages according to the invention can also be provided in all diaphragm wall panels, which facilitates logistics on the construction site. The simplified milling of the primary diaphragm wall panels when creating a diaphragm wall also allows the primary diaphragm wall panels to be created with an increased tolerance. This can help reduce the cost of a construction project.

Hinsichtlich des Verfahrens zum Erstellen einer Schlitzwand ist die Erfindung dadurch gekennzeichnet, dass ein zuvor beschriebener erfindungsgemäßer Armierungskorb in den Schlitz eingesetzt wird. Mit dem erfindungsgemäßen Verfahren können die zuvor beschriebenen Vorteile hinsichtlich eines geringeren Verschleißes einer Schlitzwandfräse sowie des Erstellens einer Schlitzwand mit verbesserter Festigkeit und Dichtigkeit erzielt werden.With regard to the method for creating a trench wall, the invention is characterized in that a previously described reinforcement cage according to the invention is inserted into the trench. With the method according to the invention, the advantages described above with regard to less wear on a trench wall cutter and the creation of a trench wall with improved strength and tightness can be achieved.

Eine bevorzugte Ausführungsform des erfindungsgemäßen Verfahrens besteht darin, dass zunächst zwei voneinander beabstandete Primärschlitzwandpaneele im Boden erstellt werden, wobei in zumindest einem Schlitz für eines der Primärschlitzwandpaneele ein Armierungskorb mit Glasfaserstäben eingesetzt wird, und dass anschließend zwischen zwei primären Schlitzwandpaneelen ein Schlitz für ein sekundäres Schlitzwandpaneel durch Fräsen erstellt wird, wobei Seitenbereiche der primären Schlitzwandpaneele und darin angeordnete Glasfaserstäbe zumindest teilweise angefräst werden. Bei diesem Verfahrensschritt werden die Fräszähne der Fräsräder einer hierfür vorgesehenen Schlitzwandfräse beim Zerspanen von eventuell in den abzufräsenden Überlappungsbereich hineinragenden Glasfaserstäben nur einem relativ geringen Verschleiß ausgesetzt, welcher jedenfalls deutlich geringer als ein Verschleiß ist, welcher bei einem Anfräsen von metallischen Armierungsstäben auftreten würde.A preferred embodiment of the method according to the invention consists in first creating two spaced-apart primary diaphragm wall panels in the ground, with a reinforcing cage with glass fiber rods being used in at least one slot for one of the primary diaphragm wall panels, and then cutting a slot for a secondary diaphragm wall panel between two primary diaphragm wall panels Milling is created, with side areas of the primary diaphragm wall panels and fiberglass rods arranged therein being at least partially milled. In this process step, the cutting teeth of the cutting wheels of a trench wall cutter provided for this purpose only become relatively small during the cutting of glass fiber rods that may protrude into the overlapping area to be cut off Exposed wear, which is in any case significantly lower than wear, which would occur when milling metal reinforcing rods.

Die Erfindung wird nachfolgend anhand eines bevorzugten Ausführungsbeispieles weiter beschrieben, welches schematisch in der Zeichnung dargestellt ist.The invention is further described below with reference to a preferred exemplary embodiment, which is shown schematically in the drawing.

Die einzige Zeichnung zeigt in einer teilgeschnittenen Querschnittsansicht einen Schlitz 7 im Boden 5. Der Schlitz 7 ist mit einem rechteckigen Querschnitt mit zwei Schmalseiten 8 und zwei zur Zeichnungsebene parallel verlaufenden Breitseiten 9 ausgebildet. In diesen Schlitz 7, welcher eine Tiefe von typischerweise zwischen 10 m bis 30 m oder tiefer aufweist, ist ein erfindungsgemäßer Armierungskorb 10 eingesetzt. Der Armierungskorb 10 weist einen etwa quaderförmigen Grundkörper 11 auf, welcher gitterartig aus Armierungsstäben 12 aufgebaut ist. Von den Armierungsstäben 12 sind in der Zeichnung die in Längsrichtung des Schlitzes 7 verlaufenden Armierungsstäbe 12 dargestellt, welche über nicht näher gezeigte horizontale oder in Querrichtung verlaufende Querstäbe vorzugsweise durch Verschweißen verbunden sind.The single drawing shows a slot 7 in the base 5 in a partially cut cross-sectional view. The slot 7 is designed with a rectangular cross-section with two narrow sides 8 and two broad sides 9 running parallel to the plane of the drawing. A reinforcing cage 10 according to the invention is inserted into this slot 7, which typically has a depth of between 10 m and 30 m or deeper. The reinforcement basket 10 has an approximately cuboid base body 11 which is constructed of reinforcement rods 12 in the manner of a grid. Of the reinforcing rods 12, the reinforcing rods 12 running in the longitudinal direction of the slot 7 are shown in the drawing, which are connected via horizontal or transverse transverse rods, not shown in detail, preferably by welding.

An Seitenbereichen des Grundkörpers 11, welche den Schmalseiten 8 des Schlitzes 7 zugeordnet sind, sind in Längsrichtung verlaufende Glasfaserstäbe 20 gelagert, welche den seitlichen Außenbereich des Armierungskorbes 10 bilden. Die in Längsrichtung verlaufenden Glasfaserstäbe 20 sind mit einer konvexen Bogenform ausgebildet, was das Einsetzen des Armierungskorbes 10 in den Schlitz 7 erleichtert, welcher mit einer hier nicht dargestellten aushärtbaren Suspension, insbesondere einer Betonsuspension, zum Bilden eines Schlitzwandpaneels im Schlitz 7 verfüllt ist.On side areas of the base body 11, which are assigned to the narrow sides 8 of the slot 7, fiberglass rods 20 running in the longitudinal direction are mounted, which form the lateral outer area of the reinforcement cage 10. The fiberglass rods 20 running in the longitudinal direction are designed with a convex arc shape, which facilitates the insertion of the reinforcement cage 10 into the slot 7, which is filled with a hardenable suspension, not shown here, in particular a concrete suspension, to form a diaphragm wall panel in the slot 7.

Die in Längsrichtung verlaufenden, gebogenen Glasfaserstäbe 20 sind über quergerichtete Träger 22 an den Armierungsstäben 12 des Grundkörpers 11 derart angebracht, dass sie fest oder auslenkbar oder in einer Querrichtung verschiebbar sind. Dies kann insbesondere dadurch erzielt werden, dass die quergerichteten Träger 22 nicht fest mit den Armierungsstäben 12 verbunden sind, sondern etwa durch Hülsen oder Drahtschlaufen auslenkbar angebracht und gelagert sind.The bent fiberglass rods 20 running in the longitudinal direction are attached to the reinforcing rods 12 of the base body 11 via transverse supports 22 in such a way that they are fixed or deflectable or displaceable in a transverse direction. This can be achieved in particular in that the transversely directed supports 22 are not firmly connected to the reinforcing rods 12, but rather are attached and mounted such that they can be deflected, for example by sleeves or wire loops.

Die Glasfaserstäbe 20 können beim Einsetzen des Armierungskorbes 10 in den Schlitz 7 bis an die Schmalseiten 8 des Schlitzes 7 heranreichen. Beim Erstellen eines benachbarten Schlitzes durch Fräsen kann das im Schlitz 7 erstellte Schlitzwandpaneel in einem Randbereich angefräst werden, wobei ein Anfräsen der Glasfaserstäbe 20 durch die metallischen Fräsräder der Schlitzwandfräsen ohne Weiteres möglich ist.The glass fiber rods 20 can reach up to the narrow sides 8 of the slot 7 when the reinforcement basket 10 is inserted into the slot 7 . When creating an adjacent slot by milling, the slot wall panel created in slot 7 be milled in an edge area, with a milling of the glass fiber rods 20 by the metal milling wheels of the trench wall cutters is easily possible.

Claims (8)

  1. Reinforcement cage for a diaphragm wall panel which, in cross section, is substantially square with a wide side (9) and a narrow side (8) and is produced in a trench (7) in the ground (5), wherein the reinforcement cage (10) has reinforcement rods (12) that are assembled in a grid-like manner and form a cuboidal base body (11),
    wherein the reinforcement cage (10) is designed at least in a lateral region, which can be allocated to a narrow side (8) of the diaphragm wall panel, with spacers (20) which can reach as far as a side wall of the trench (7), characterized in that
    the spacers are formed by glass fiber rods (20),
    in that in the lateral region at least individual glass fiber rods (20), which can reach as far as the side wall of the trench (7), extend in the longitudinal direction of the reinforcement cage (10) with an outward-directed convex arcuate shape, and
    in that the glass fiber rods (20) are fixed in a deflectable manner on the base body (11).
  2. Reinforcement cage according to claim 1,
    characterized in that
    the base body (11) is a grid-like base body (11) which is formed with reinforcement rods (12) of steel and
    in that on the base body (11) at least one lateral region with glass fiber rods (20) is arranged.
  3. Reinforcement cage according to claim 1 or 2,
    characterized in that
    on the base body (11) two lateral regions with glass fiber rods (20) are arranged.
  4. Reinforcement cage according to claim 3,
    characterized in that
    the two lateral regions extend as far as the edge of the narrow sides (8) of the diaphragm wall panel to be formed and form a centering element.
  5. Diaphragm wall panel in the ground (5),
    characterized in that
    this is formed with a reinforcement cage (10) according to any one of claims 1 to 4.
  6. Diaphragm wall in the ground (5) which is designed of several adjoining diaphragm wall panels,
    characterized in that
    at least one diaphragm wall panel according to claim 5 is provided.
  7. Method for producing a diaphragm wall in the ground (5) of individual diaphragm wall panels, wherein a trench (7) is produced in the ground (5) which is filled with a hardenable mass, wherein before, during or after filling of the hardenable mass a reinforcement cage (10) is inserted into the trench (7),
    characterized in that
    a reinforcement cage (10) according to any one of claims 1 to 4 is inserted into the trench (7) .
  8. Method according to claim 7,
    characterized in that
    initially two primary diaphragm wall panels spaced apart from each other are produced in the ground, wherein in at least one trench (7) for one of the primary diaphragm wall panels a reinforcement cage (10) with glass fiber rods (20) is inserted, and
    in that subsequently between the two primary diaphragm wall panels a trench (7) for a secondary diaphragm wall panel is produced by means of cutting, wherein the lateral regions of the primary diaphragm wall panels and glass fiber rods (20) arranged therein are cut at least partially.
EP19172482.2A 2019-05-03 2019-05-03 Reinforcing cage and method for producing a slotted wall Active EP3733975B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19172482.2A EP3733975B1 (en) 2019-05-03 2019-05-03 Reinforcing cage and method for producing a slotted wall
PCT/EP2020/057291 WO2020224841A1 (en) 2019-05-03 2020-03-17 Reinforcing cage and method for producing a slotted wall

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19172482.2A EP3733975B1 (en) 2019-05-03 2019-05-03 Reinforcing cage and method for producing a slotted wall

Publications (2)

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EP3733975A1 EP3733975A1 (en) 2020-11-04
EP3733975B1 true EP3733975B1 (en) 2022-09-28

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EP (1) EP3733975B1 (en)
WO (1) WO2020224841A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1029709C1 (en) 2005-07-05 2007-01-08 Bam Civiel B V Method for manufacturing a deep wall, as well as spacer.
KR20130015267A (en) 2010-03-30 2013-02-13 파우에스엘 인터나치오날 아게 Method and assembly for constructing a diaphragm wall
CN205399399U (en) * 2016-03-16 2016-07-27 中冶集团武汉勘察研究院有限公司 Underground continuous wall structure that adoption glass fiber reinforced overlap joint cover mills
GB2566970A (en) * 2017-09-29 2019-04-03 Ccmj Systems Ltd Spacers

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EP3733975A1 (en) 2020-11-04

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