NL2021384B1 - Tensioning device - Google Patents

Tensioning device Download PDF

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Publication number
NL2021384B1
NL2021384B1 NL2021384A NL2021384A NL2021384B1 NL 2021384 B1 NL2021384 B1 NL 2021384B1 NL 2021384 A NL2021384 A NL 2021384A NL 2021384 A NL2021384 A NL 2021384A NL 2021384 B1 NL2021384 B1 NL 2021384B1
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Netherlands
Prior art keywords
tube
screw bolt
concrete layer
concrete
ring part
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NL2021384A
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Dutch (nl)
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NL2021384A (en
Inventor
Gerrit Willem Van Den Boogaart Robert
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B Btec Int B V
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Abstract

The object of the invention is tensioning two concrete layers which are reinforced with iron. For this the method according to the invention proposes that a screw bolt (6) is fixed in a bore hole in one layer by means of an adhesive means, a hollow tube of a filling device of the screw bolt (6) is attached in the bore hole (5), wherein the hollow tube (8.1) has a larger inner diameter compared with the diameter of the screw bolt (6) and supports at its rear end a ring (8.2) projecting radially beyond the hollow tube and formed concave towards the hollow tube (8.1), the filling device is fixed on the screw bolt (6) by a nut against the first concrete layer (1), mortar is inserted through an opening (8.4) formed eccentrically in the ring part (8.2), into a ring channel (5.3) of the bore (5) surrounding the hollow tube until the mortar emerges through a further ring channel (5.4) between the hollow tube and screw bolt out from a central aperture (8.5) of the ring part, the concrete layers (1, 2) are cross—braced by tightening up the screw nut (9) and the mortar (12) is hardened.

Description

Tensioning device
The invention relates to a method for cross-bracing concrete layers, to a tensioning device for cross-bracing concrete layers against one another, to a filling device for filling an annular region of a bore hole in concrete as part of the said tensioning device and to a system for cross-bracing concrete layers by using the aforementioned devices .
There are concrete ceilings which are designed in at least two layers in such a way that first a first lower concrete layer reinforced with iron was cast and then a second likewise reinforced concrete layer was cast thereon. In some cases these two layers separate from one another, become delaminated. Where access is possible from the top side the concrete layers which are to be connected to one another are drilled right through, a screw bolt is pushed through the bore hole, the bore hole is filled with mortar and the concrete layers are braced against one another by nuts screwed onto the screw bolts on both sides. Where access is not possible from the top side it is not possible to use this method because there is another layer there, such as ground coverings, installations or even garden soil.
The invention is therefore concerned with the problem of providing a device, an installation and a system as well as a method of the types each mentioned above which enable a connection of individually separated delaminated concrete layers from the underneath side.
According to the invention this problem is solved first by a method for cross-bracing concrete layers comprising the following steps:
a. drilling a bore hole through a first concrete layer into a second layer;
b. inserting a destructible bonded anchor cartridge containing an adhesive means, such as vinyl ether, into the portion of the bore hole located in the second concrete layer;
c. inserting a screw bolt into the bore hole by destroying the cartridge by means of the screw bolt;
d. hardening the adhesive;
e. inserting a hollow tube of a filling device into the bore hole wherein an inner end of the hollow tube has a final distance from the adhesive means and wherein the hollow tube has a larger internal diameter compared with the diameter of the screw bolt and supports at its rear end a ring projecting radially over the hollow tube and designed concave towards the hollow tube;
f. fixing the filling device on the screw bolt by a nut, where applicable through the interposition of a washer, against the first concrete layer;
g. inserting mortar, more particularly plastics mortar, through an opening formed eccentrically in the ring part into the ring channel of the bore surrounding the hollow tube until the mortar emerges out from a central aperture of the ring part through a further ring channel between the hollow tube and screw bolt;
h. cross-bracing the concrete layers by tightening up the screw nut, and
i. hardening the inserted mortar.
To solve the problem the invention further proposes a tensioning device which comprises a screw bolt, an adhesive means, such as vinyl ether, a filling device, mortar, more particularly plastics mortar, and a nut which can be screwed to the screw bolt. The solution to the said problem is further achieved by a filling device for filling the ring chamber of a bore hole, which is characterized by a tube and a ring part connected thereto which is designed concave towards the tube and outside of the tube has an eccentric opening as well as a central aperture which is connected to the inside of the tube. Finally, the said problem is solved by a system of cross-bracing concrete layers, the concrete layers which are to be braced against one another, and includes a device configured as above and is more particularly characterized in that
a. a two-step bore extends from an outer side of a first concrete layer, preferably the underneath side of a first concrete layer, through the latter into the second concrete layer and ends at a final distance from the end face of the second concrete layer which is remote from the first concrete layer;
b. that a first outer portion of the bore extending through the first concrete layer and partially into the second concrete layer has a larger diameter than the following second inner portion of the bore;
c. that the screw bolt extends through the entire bore, projects with a rear end beyond the first concrete layer and is fixed by its front end side solely in the second concrete layer by means of a hardened adhesive means, such as vinyl ether, preferably from a bonded anchor cartridge;
d. that the tube of the filling device in the widened part of the bore hole furthermore is arranged with a radial distance on the one side from the bore hole wall and on the other side from the screw bolt and the ring part bears against the free surface of the first concrete layer;
e. that the interspaces between the tube and inside wall of the bore hole as well as between the tube and screw bolt are filled completely with hardened mortar, epoxy resin, and
f. that the two concrete layers are braced against one another with the aid of the ring part of the filler element through the nut interacting with the screw bolt and are held bonded to one another by hardened mortar located in the widened part of the bore hole.
A reliable permanent connection between individually separated delaminated concrete layers is possible through the solution according to the invention, also within the scope of the elements of the solution detailed individually as well as the procedure relating to the method.
Whereas the adhesive means mentioned, mortar and adhesive substances, are those preferred, others such as polyester and hybrid adhesives based on dimethacrylate can also be provided.
Within the scope of the method it is preferred if reinforcing iron rods are located in the concrete layers beforehand. The bore hole is furthermore preferably cleaned, namely more particularly by compressed air, prior to inserting the bonded anchor cartridge.
The tensioning device is preferably designed in that the filling device comprises a tube and a ring part radially projecting beyond the latter wherein more particularly the tube and the ring part of the filling device are furthermore formed integrally with one another and/or the ring part is shaped concave towards the tube. Further developments of the tensioning device propose that the ring part has radial grooves on its side facing away from the tube and/or that the filling device has in addition to a central aperture an eccentric opening in the ring part wherein the tensioning device furthermore can have a washer for interposition between the nut and ring part of the filling device.
In a further development of the filling device it is proposed that radial grooves are formed extending before the aperture on the side of the ring part facing away from the tube and/or that they are formed in one piece.
The system according to the invention for cross-bracing the concrete layers can be further developed in that a washer is disposed between the ring part of the filling device and the nut.
Through the invention the possibility is thus provided of cross-bracing delaminated concrete layers to one another again which are only accessible from one side, more particularly the underneath side.
Further advantages and features of the invention are apparent from the claims and the following description in which an exemplary embodiment of the invention is explained in detail with reference to the drawings. In the drawings:
Fig. 1 shows an overall view of the tensioning system according to the invention, at the same time as the last method step of the method according to the invention for crossbracing concrete layers;
Fig. 2 shows a perspective view of a filling device according to the invention for introducing mortar into a bore; and
Figs. 3a-
3e show method steps of the method according to the invention.
The tensioning system according to the invention contains two concrete layers 1, 2 which are braced to one another by a tensioning device 3 according to the invention.
The concrete layers 1, 2 are a lower cast ceiling layer 1 and a concrete layer 2 cast thereon. Both layers 1, 2 are reinforced by reinforcing iron rods 4.
A two-step bore 5 extends from the underneath of the first concrete layer 1 into the second concrete layer 2. It ends with a final distance below the top side 2.1 of the concrete layer 2.
The two-step bore 5 comprises a lower bore portion 5.1 which extends through the concrete layer 1 up into the concrete layer 2. It has an adjoining second bore portion
5.2 in the second concrete layer 2. The lower bore portion
5.1 has a larger diameter than the upper bore portion 5.2.
A screw bolt 6 which is fixed by its upper region 6.1 in the bore hole part 5.2 by means of a hardened resin 7 extends from the lower layer 1 through the entire bore up to its upper (inner) end 5.1.1. The resin 7 is one already known by way of example from ML2004469A, corresponding to DE 10 2010 013 924 Al.
A tube 8.1 of a filling device 8 consisting of this and a ring part 8.2 is inserted in the lower widened bore part 5.2. The parts 8.1, 8.2 are formed integral with one another. The ring part 8.2 projects radially beyond the tube 8.1 and is designed concave in respect of same. The internal diameter of the tube 8.1 is by a finite value greater than the diameter of the screw bolt 6. The outer diameter of the tube 8.1 is by a finite value smaller than the diameter of the bore 5 in the lower region 5.1 so that ring channels 5.3, 5.4 are formed between the inner wall of the bore 5 in the region 5.1 and the tube 8.1, on the one hand, and the tube 8.1 and the screw bolt 6 on the other hand.
The inner end 8.3 of the tube 8.1 facing away from the ring part 8.2 ends with a final distance in front of the inner end 5.1.1 of the portion 5.1 of the bore 5 so that between the end 8.3 of the tube 8.1 and the ledge formed by the end
5.1.1 of the region 5.1 of the bore 5, a connecting space 5.5 of the bore 5 is formed between the two ring channels 5.3, 5.4 previously described.
The filling device 8 has an eccentric opening 8.4 in the ring part 8.2. It furthermore has in the centre an aperture 8.5 which is connected to the interior of the tube
8.1 and from which, on the outer side of the ring part 8.2 facing away from the tube 8.1, grooves 8.6 extend radially over a certain part of the ring part 8.2.
The tensioning system and tensioning device according to the invention furthermore include a nut 9 interacting with the screw bolt 6, and a washer 10 arranged between the nut and the ring part 8.2, as well as a key 11 engaging on the nut 9 and against the first concrete layer 1 via the washer 10 and the ring part 8.2.
Mortar 12, more particularly plastics mortar, such as epoxy, vinyl, urethane or a hybrid mortar of these materials is introduced through the eccentric opening 8.4 into the two ring channels in the region between the concrete part 1 and the washer 10 and emerges from the grooves 8.6 and hardens after the nut 9 is tensioned, wherein on tensioning the nut 9 the securement of the bolt 6 in the concrete part 2 forms the brace abutment.
The two concrete layers 1, 2 are fixedly braced against one another in this way through the screw bolt 6 by means on the one hand of the resin 7 hardened in the concrete layer 2, and on the other hand of the mortar 12 assisted by the screw nut 9.
The method sequence for producing the cross-bracing and the tensioning system according to the invention is shown in Figs. 3-3e completed by the result of Fig. 1 and is substantially as follows:
First, where applicable, reinforcement layers are placed in the concrete layers 1, 2 so that the latter are not damaged by the following measures. Then, according to Fig 3a, a two-step bore is made through the concrete layer 1 and into the concrete layer 2 by means of a suitable drill provided with a step in a drilling step, wherein the step is located between the radially wider bore part 5.1 and the radially narrower bore part 5.2 inside the concrete layer 2, and the bore ends with a final distance from the opposite surface of the concrete layer 2.
In a next step, a bonded anchor cartridge 7.1 containing a resin 7 such as vinyl ether, is inserted into the portion
5.2 of the bore hole 5 and the screw bolt is then screwed in under pressure, wherein it destroys the bonded anchor cartridge 7.1, as described in the printed specifications mentioned above, and its inner upper end then arrives at the bottom of the bore part 5.2 of the bore 5 (Fig. 3b).
The resin 7 in the bore hole part 5.2 of the bore hole 5 is then hardened whereby the screw bolt 6 of the concrete layer 2 is fixed (Fig. 3c). The filling device 8 is then inserted with its tube 8.1 into the region 5.1 of the bore hole 5, pushed in to surround the screw bolt 6 at a distance and at first tensioned loosely with its ring part
8.2 against the underneath surface of the concrete layer 1 (Fig. 3d) through the nut 9 with the interposition of the washer 10.
Mortar 12 is then forced from a cartridge 12.1 through the eccentric opening 8.4 of the ring part 8.2 into the region between the ring part 8.2 and underneath surface of the concrete layer 1 further into the outer ring channel 5.3 surrounding the tube 8.1 in the bore portion 5.1 (likewise Fig. 3d), then back over the region 5.5 through the inner ring channel 5.4 between the tube 8.1 and screw bolt 6 until it emerges through the grooves 8.6 on the outer side of the ring part 8.2. This indicates that the entire path or space described, more particularly the two said ring channels, are completely filled with the mortar (Fig. 3e).
Tensioning the nut 9 on the screw bolt 6 is now carried out by means of the key 11 (Fig. 1) whereby the two concrete layers 1, 2 are pressed against one another.
The mortar then hardens on the one hand in the outer ring channel 5.3 outside of the tube 8.1 and on the other hand in the inner ring channel 5.4 between the tube 8.1 and screw bolt 6. The two layers 1, 2 are here braced securely against one another and connected to one another.
Corresponding cross-braces are carried out at suitable intervals over the entire surface of the concrete layers 1,

Claims (2)

1. Werkwijze voor het vastzetten van betonlagen (1,1. Method for fixing concrete layers (1, 2) met de stappen:2) with the steps: a. het boren van een boorgat (5) door een eerste betonlaag (1) tot in een tweede betonlaag (2),a. drilling a borehole (5) through a first concrete layer (1) into a second concrete layer (2), b. het inbrengen van een kleefmiddel (7), zoals vinylether, bevattende vernietigbare verbindingsdeuvelpatronen in het zich in de tweede betonlaag (2) bevindende gedeelte (5.2) van het boorgat,b. inserting an adhesive (7), such as vinyl ether, containing destructible bonding dowel patterns into the portion (5.2) of the borehole located in the second concrete layer (2), c. het inbrengen van een schroefbout (6) in het boorgat (5) onder vernieling van het patroon (7.1) middels de schroefbout (6),c. inserting a screw bolt (6) into the borehole (5) destroying the cartridge (7.1) by means of the screw bolt (6), d. het uitharden van het kleefmiddel (7),d. curing the adhesive (7), e. het inbrengen van een holtebuis (8.1) van een beladingsinrichting (8) in het boorgat (5), waarbij een binnenste einde (8.3) van de holtebuis (8.1) een eindige afstand ten opzichte van het kleefmiddel omvat en waarbij de holtebuis (8.1) een ten opzichte van de diameter van de schroefbout (6) grotere binnendiameter omvat en aan diens achterwaarts gerichte einde een ring (8.2) draagt die radiaal over de holtebuis heen reikt, die naar de holtebuis (8.1) toe concaaf gevormd is,e. inserting a cavity tube (8.1) of a loading device (8) into the borehole (5), an inner end (8.3) of the cavity tube (8.1) comprising a finite distance from the adhesive and the cavity tube (8.1) a larger inner diameter relative to the diameter of the screw bolt (6) and carrying a ring (8.2) at its rearwardly directed end extending radially over the cavity tube, which is concave shaped towards the cavity tube (8.1), f. het vastleggen van de beladingsinrichting aan de schroefbout door een moer, eventueel onder een tussenlaag van een onderlegschijf, tegen de eerste betonlaag (1),f. fixing the loading device to the screw bolt by a nut, possibly under an intermediate layer of a washer, against the first concrete layer (1), g. het inbrengen van een mortel, in het bijzonder kunststofmortel, door een excentrisch in het ringdeel (8.2) gevormde opening (8.4) in een de holtebuis omringend ringkanaal (5.3) van de boring (5) tot de mortel via een verder ringkanaal (5.4) tussen holtebuis en schroefbout uit een in het midden gelegen doorbreking (8.5) van het ringdeel uittreedt,g. the insertion of a mortar, in particular synthetic mortar, through an eccentrically formed opening (8.4) in the ring part (8.2) into a ring channel (5.3) surrounding the cavity tube from the bore (5) to the mortar via a further ring channel (5.4) emerges from a central opening (8.5) of the ring part between the cavity tube and the screw bolt, h. het vastzetten van de betonlagen (1, 2) onder het aandraaien van de schroefmoer (9), enh. fixing the concrete layers (1, 2) while tightening the screw nut (9), and i. het uitharden van de ingebrachte mortel (12).i. curing the inserted mortar (12). 5 2. Werkwijze volgens conclusie 1, met het kenmerk dat vooraf bewapeningsstaal in de betonlagen (1, 2) geplaatst wordt.2. Method according to claim 1, characterized in that reinforcing steel is placed in the concrete layers (1, 2) beforehand. 3. Vastzetinrichting voor het tegen elkaar vastzetten van3. Securing device for securing against each other 10 betonlagen, met een schroefbout (6), een kleefmiddel zoals vinylether, een beladingsinrichting (8), mortel (12), in het bijzonder kunststofmortel, en een met de schroefbout (6) verschroefbare moer (9).10 concrete layers, with a screw bolt (6), an adhesive such as vinyl ether, a loading device (8), mortar (12), in particular synthetic mortar, and a nut (9) screwable with the screw bolt (6). 15 4. Inrichting volgens conclusie 3, met het kenmerk dat de beladingsinrichting (8) een buis (8.1) en een deze radiaal overheen reikend ringdeel (8.2) omvat.Device according to claim 3, characterized in that the loading device (8) comprises a tube (8.1) and a ring part (8.2) extending radially over it. Inrichting volgens conclusie 4, met het kenmerk datDevice according to claim 4, characterized in that 20 buis (8.1) en ringdeel (8.2) van de beladingsinrichting (8) uit één stuk met elkaar gevormd zijn.The tube (8.1) and the ring part (8.2) of the loading device (8) are formed in one piece. 6. Inrichting volgens conclusie 4 of 5, met het kenmerk dat het ringdeel (8.2) naar de buis (8.1) toe concaafDevice according to claim 4 or 5, characterized in that the ring part (8.2) is concave towards the tube (8.1) 25 gevormd is.25 is formed. 7. Inrichting volgens één van de conclusies 4-6, met het kenmerk dat het ringdeel (8.2) op diens aan de van de buis (8.1) afgekeerde zijde radiale groeven (8.6) omvat.Device according to any one of claims 4-6, characterized in that the ring part (8.2) has radial grooves (8.6) on its side facing away from the tube (8.1). 8. Inrichting volgens één van de conclusies 3-7, met het kenmerk dat de beladingsinrichting (8) naast een centrale doorbreking (8.5) een excentrische opening (8.4) in het ringdeel (8.2) omvat.Device according to any one of claims 3-7, characterized in that the loading device (8) comprises an eccentric opening (8.4) in the ring part (8.2) in addition to a central opening (8.5). 9. Inrichting volgens één van de conclusies 3-8, gekenmerkt door een onderlegschijf (10) voor de rangschikking tussen moer (9) en ringdeel (8.2) van de beladingsinrichting (8).Device according to any one of claims 3-8, characterized by a washer (10) for the arrangement between nut (9) and ring part (8.2) of the loading device (8). 10. Beladingsinrichting voor het beladen van het ringbereik van een boorgat in beton om een zich hierin bevindende schroefbout heen, gekenmerkt door een buis (8.1) en een hiermee verbonden ringdeel (8.2), dat naar de buis toe concaaf gevormd is en buiten de buis een excentrische opening (8.4) alsmede een in het midden gelegen, met het binnenste van de buis (8.1) in verbinding staande doorbreking (8.5) omvat.Loading device for loading the annulus of a concrete borehole around a threaded bolt contained therein, characterized by a tube (8.1) and an associated ring portion (8.2), which is concave shaped towards the tube and outside the tube an eccentric opening (8.4) and a central opening (8.5) communicating with the interior of the tube (8.1). 11. Inrichting volgens conclusie 10, met het kenmerk dat voor de doorbreking (8.5), op de van de buis (8.1) afgekeerde zijde van het ringdeel (8.2) uitgaand radiale groeven, uitstrekkende groeven (8.6) gevormd zijn.Device according to claim 10, characterized in that extending grooves (8.6) are formed on the side of the ring part (8.2) facing away from the tube (8.1) facing away from the tube (8.1) before the break-through (8.5). 12. Inrichting volgens conclusie 10 of 11, met het kenmerk dat zij uit één stuk gevormd zijn.Device according to claim 10 or 11, characterized in that they are formed in one piece. 13. Systeem voor het vastzetten van betonlagen, met met elkaar vast te zetten betonlagen (1.2) en een vastzetinrichting (3) volgens één van de conclusies 1 - 10, met het kenmerk dat,A system for fixing concrete layers, with concrete layers to be fixed together (1.2) and a fixing device (3) according to any one of claims 1 to 10, characterized in that, a. zich een tweetrapsboring (5) van een buitenzijde van een eerste betonlaag (1), bij voorkeur de onderzijde van een eerste betonlaag (1) hierdoorheen tot in de tweede betonlaag (2) uitstrekt en op een eindige afstand tot de van de eerste betonlaag afgekeerde voorkant van de tweede betonlaag (2) eindigt,a.a two-stage bore (5) from an outside of a first concrete layer (1), preferably the bottom side of a first concrete layer (1), extends through it into the second concrete layer (2) and at a finite distance from the of the first concrete layer facing away from the second concrete layer (2) ends, b. dat een zich door de eerste betonlaag (1) en gedeeltelijk tot in de tweede betonlaag (2) uitstrekkend eerste buitenste gedeelte (5.1) van de boring (5) een grotere diameter omvat dan het volgende tweede binnenste gedeelte (5.2) van de boring (5),b. that a first outer portion (5.1) of the bore (5) extending through the first concrete layer (1) and partially into the second concrete layer (2) has a larger diameter than the next second inner portion (5.2) of the bore ( 5), c. dat de schroefbout (6) zich door de gezamenlijke boring uitstrekt, met een achterwaarts gericht einde over de eerste betonlaag (1) heen reikt en met diens voorste einde binnen uitsluitend in de tweede betonlaag middels een uitgehard kleefmiddel, zoals vinylether, bij voorkeur uit een verbindingsdeuvelpatroon, vastgelegd is,c. that the screw bolt (6) extends through the joint bore, with a rearward-facing end extending over the first concrete layer (1) and with its front end inside only in the second concrete layer by means of a cured adhesive, such as vinyl ether, preferably of a connection dowel pattern, is established, d. dat verder de buis (8.1) van de beladingsinrichting (8) in het verdere deel (5.1) van het boorgat (5) met radiaalafstand enerzijds naar de boorgatwand, anderzijds naar de schroefbout (6) gerangschikt is en het ringdeel (8.2) aan het vrije oppervlak van de eerste betonlaag (1) aanligt,d. furthermore the tube (8.1) of the loading device (8) is arranged in the further part (5.1) of the borehole (5) with radial distance on the one hand to the borehole wall, on the other hand to the screw bolt (6) and the ring part (8.2) to the abutting surface of the first concrete layer (1), e. dat de tussenruimte tussen buis (8.1) en binnenwand van het boorgat alsmede tussen buis (8.1) en schroefbout (6) volledig met uitgeharde mortel, zoals epoxihars beladen zijn, ene. that the space between pipe (8.1) and inner wall of the borehole as well as between pipe (8.1) and screw bolt (6) is fully loaded with cured mortar, such as epoxy resin, and f. dat de beide betonlagen (1, 2) door tussenkomst van het ringdeel (8.2) van het beladingselement (8) door de met de schroefbout (6) samenwerkende moer (9) tegen elkaar vastgezet zijn en door uitgeharde, zich in het verdere deel (5.1) van het boorgat bevindende mortel met elkaar in verband gehouden zijn.f. that the two concrete layers (1, 2) are secured against each other through the ring part (8.2) of the loading element (8) by the nut (9) cooperating with the screw bolt (6) and by hardened, in the further part ( 5.1) mortar from the borehole are related to each other. 14. Systeem volgens conclusie 13, met het kenmerk dat tussen het ringdeel (8.2) van de beladingsinrichting (8) en de moer (9) een onderlegschijf (10) gerangschikt is.System according to claim 13, characterized in that a washer (10) is arranged between the ring part (8.2) of the loading device (8) and the nut (9).
NL2021384A 2018-06-20 2018-07-24 Tensioning device NL2021384B1 (en)

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