DE1484587C

DE1484587C - Pourable rock anchor

Info

Publication number: DE1484587C
Application number: DE19621484587
Authority: DE
Inventors: der Anmelder E02d 5 54 ist
Original assignee: Williams, Chester I, Grand Rapids, Mich (V St A)
Priority date: 1961-07-31
Filing date: 1962-07-30
Publication date: 1973-04-19

Description

3 43 4

Der Ankerstab 10 (Fig. 1) ist in die in der Ge- im Ankerstab 22, so daß der Übergang zur Bohrung Steinsformation 12 vorhandenen Bohrung 11 einge- 24 nicht versetzt werden kann, wenn das elastische setzt. Der Ankerstab 10 hat eine geradlinige Achse Aufsatzstück 23 sich verschieben sollte. ι und hat Oberflächenunregelmäßigkeitcn 13, die in Beim Einpumpen des Mörtels in den Zuführstuteinem kombinierten schraubenlinienförmi^en Muster 5 zen 16 wird an der Eintrittsstelle, an der die Bohrung über die gesamte Länge des Ankerstabs 10 geformt 11 die Fläche 31 schneidet, ein hoher Druck entwiksind, um die Festhaltewirkung zwischen dem Anker- kelt. Zum Abdichten wird für gewöhnlich eine Dichtstab 10 und dem Mörtel zu erhöhen, der später in den masse in den Raum 32 eingestrichen. Dieser Raum 32 zwischen dem Ankerstab 10 und der Wand der Boh- ist mit einer Platte 33 abgedeckt, die in bezug auf die rung 11 vorhandenen Raum 14 eingegossen wird. Der io Achse der Bohrung 11 schwenkbar ist, um ein Anpashohle Innenraum des Ankerstabs 10 bildet einen sen an Winkellagen zwischen der Ebene der Fläche 31 Durchlaß 15 zum Ausströmen der eingeschlossenen und der Achse des Ansatzes 34 zu ermöglichen. Zum Luft, wenn der Mörtel am Zuführstutzeii 16 zugeführt Festlegen des Ankers bei dem zur Einwirkung gewird. Beim allmählichen Füllen des Raumes 14 mit brachten Druck des Mörtels dient ein in der Nähe des dem Mörtel strömt die eingeschlossene Luft am rück- 15 äußeren Endes der Bohrung 11, d. h. nahe angebrachwärtigen Ende des Ankerstabs 10 entweder über die ter, aufspreizbarer Ankerkörper, dessen Spreizvor-Öffnung in der Stirnseite 21 des Ankerstabs 10 oder richtung aus einem konischen Spreizglied 35 und über eine der Diametralbohrungen 17 bis 20 in den Klemmschuhen 36 und 37 besteht. Diese Klemm-Durchlaß 15. Diese Diametralbohrungen 17 bis 20 schuhe 36, 37 haben eine Innenfläche, die mit dem stehen senkrecht zueinander. Durch die Anordnung 20 Konus des Spreizglieds 35 übereinstimmt. Eine auf mehrerer Diametralbohrungen 17 bis 20 etwas vor den Ansatz 34 ausgeübte Zugspannung zieht das dem gebirgseitigen Ende 21 des Ankerstabs 10, ver- Spreizglied 35 in Axialrichtung gegen die Klemm-, ringert sich die Möglichkeit, daß der Weg für den schuhe 36 und 37. Die Klemmschuhe 36, 37 werden Luftstrom durch Staub oder Gesteinsteilchen ver- dabei in Radialrichtung auseinander gespreizt und lestopft wird. 25 gen sich an die Wand der Bohrung 11 an. Das Fest-The anchor rod 10 (Fig. 1) is in the Ge in the anchor rod 22, so that the transition to the bore Stone formation 12 existing hole 11 can not be moved 24 if the elastic puts. The anchor rod 10 has a straight axis attachment piece 23 should move. ι and has surface irregularities 13 which occur when the mortar is pumped into the feed duct combined helical pattern 5 zen 16 is at the entry point where the hole Shaped over the entire length of the anchor rod 10 11 intersects the surface 31, a high pressure is developed, about the holding effect between the anchor kelt. A sealing rod is usually used for sealing 10 and the mortar, which was later coated into the mass in room 32. This room 32 between the anchor rod 10 and the wall of the Boh- is covered with a plate 33, which with respect to the tion 11 existing space 14 is poured. The io axis of the bore 11 is pivotable to an adaptive hollow The interior of the anchor rod 10 forms a sen at angular positions between the plane of the surface 31 Passage 15 to allow the enclosed and the axis of the extension 34 to flow out. To the Air when the mortar is fed in at the feed nozzle 16. When gradually filling the space 14 with brought pressure of the mortar a near the The enclosed air flows through the mortar at the rear 15 outer end of the bore 11, i. H. nearby End of the anchor rod 10 either over the ter, expandable anchor body, the Spreizvor-opening in the end face 21 of the anchor rod 10 or direction of a conical expansion member 35 and consists of one of the diametrical bores 17 to 20 in the clamping shoes 36 and 37. This clamping passage 15. These diametrical bores 17 to 20 shoes 36, 37 have an inner surface that with the are perpendicular to each other. The arrangement 20 cone of the expansion member 35 coincides. One on several diametrical bores 17 to 20 slightly in front of the approach 34 tensile stress pulls the the mountain-side end 21 of the anchor rod 10, spreading member 35 in the axial direction against the clamping, the possibility that the way for the shoes 36 and 37. The clamping shoes 36, 37 wrinkles Air flow through dust or rock particles spreads apart in the radial direction and clogs it up will. 25 correspond to the wall of the bore 11. The party-

An Stelle der in F i g. 2 dargestellten Diametral- schrauben der Mutter 38 gegen die Platte 33 bewirkt bohrungen zeigt F i g. 3 ein auf das Ende des Anker- die erforderliche Spreizwirkung und erzeugt, insbestabs 22 aufgesetztes Aufsatzstück 23. Der Ankerstab sondere bei Vorhandensein der Dichtmasse im Raum 22 hat die gleiche Ausführung wie der in F i g. 1 dar- 32, die notwendige Dichtung für den Mörtel. Die gestellte Ankerstab 10. Das Aufsatzstück 23 ist über 30 Klemmschuhe 36 und 37 haben einen Abstand vondas Ende des Ankerstabs 22 gestülpt, um die Diame- einander. Der Raum zwischen diesen Klemmschuhen tralbohrungen 26, 27, 28 mit der Bohrung 24 des An- 36, 37 bildet einen Durchlaß für den Mörtel längs des kerstabs 22 zu verbinden, durch welchen die einge- Ansatzes 34 und des Ankerstabs 10. Um eine Spreizbeschlossene Luft entweicht. Das Aufsatzstück 23 be- wegung der Klemmschuhe 36 und 37 zum Gestein hin steht vorzugsweise aus Kautschuk oder einem anderen 35 einzuleiten, muß vor dem Aufsetzen der Platte 33 unmindestens halbelastischen Material. Das Aufsatz- ter Umständen ein Rohrstück in die Bohrung 11 eingestück 23 hat nach dem Ausführungsbeispiel eine führt werden, das sich an die Außenenden 39 und 40 Ringlippe 25, die als Kolben wirkt und die die vor der Klemmschuhe 36, 37 anlegt und diese etwas gegen dem Aufsatzstück 23 liegenden Gesteinsteilchen und das Spreizglied 35 hin verschiebt. Das Spreizen der den Staub beim Einsetzen des Ankerstabs 22 vor sich 4? Klemmschuhe 36 und 37 kann auch von einem nicht herschiebt, so daß die Fläche 29, in der die Diametral- dargestellten Druckring eingeleitet werden, der auf bohrungen 26, 27, 28 münden, möglichst frei von der- dem Ansatz 34 sitzt. Die Anordnung der Klemmartigem Material ist. Die Ringlippe 25 schafft auch schuhe 36, 37 nahe der Fläche 31, d. h. nahe dem äueinen wenigstens geringen Zwischenraum zwischen der ßeren Ende der Bohrung 11 erleichtert wesentlich den Fläche 29 des Aufsatzstücks 23 und der Wand der 45 Einbau des Ankers. Bei Ankerkörpern,.bei denen eine Bohrung 11, so daß die Luft leichter über alle diese Drehung erforderlich ist, um eine Klemmwirkung zu Durchlässe wegströmt. Vorzugsweise münden die Ra- erzielen, vermindert diese Anordnung der Klemm-, dialbohrungen 26, 27 und 28 in eine Mittelkammer 30 schuhe 36, 37 die Torsionsbeanspruchung des Ankermit etwas größerem Durchmesser als die Bohrung 24 stabs 10.Instead of the in FIG. 2, the diametrical screwing of the nut 38 against the plate 33 is effected F i g shows the holes. 3 a on the end of the anchor the required expansion effect and generated, especially 22 attached top section 23. The tie rod is special if the sealant is present in the room 22 has the same design as that in FIG. 1 represents 32, the necessary seal for the mortar. the Asked anchor rod 10. The top piece 23 is about 30 clamping shoes 36 and 37 are spaced from that The end of the anchor rod 22 is slipped around the diamonds. The space between these clamp shoes central bores 26, 27, 28 with the bore 24 of the to 36, 37 forms a passage for the mortar along the To connect kerstabs 22, through which the included approach 34 and the anchor rod 10. To a spread resolved Air escapes. The attachment piece 23 moves the clamping shoes 36 and 37 towards the rock is preferably made of rubber or another 35 must be introduced before placing the plate 33 at least semi-elastic material. Under certain circumstances, the attachment can insert a piece of pipe into the bore 11 According to the exemplary embodiment, 23 has a lead that is attached to the outer ends 39 and 40 Annular lip 25, which acts as a piston and which applies in front of the clamping shoes 36, 37 and this somewhat against the top piece 23 lying rock particles and the spreader 35 moves towards. Spreading the the dust when inserting the anchor rod 22 in front of you 4? Clamping shoes 36 and 37 cannot be used by one either pushes so that the surface 29, in which the diametrically illustrated pressure ring are introduced, the Bores 26, 27, 28 open, as free as possible from the shoulder 34 is seated. The arrangement of the clamp-like Material is. The annular lip 25 also creates shoes 36, 37 near the surface 31, i.e. H. close to the outer at least a small gap between the ßeren end of the bore 11 facilitates the significantly Surface 29 of the top section 23 and the wall of 45 installation of the anchor. For anchor bodies, .which one Bore 11, so that the air is more easily required over all this rotation in order to have a clamping effect Passages flowing away. Preferably the Ra- achieve, this arrangement reduces the clamping, dial bores 26, 27 and 28 in a central chamber 30 shoes 36, 37 with the torsional stress of the anchor slightly larger diameter than the bore 24 stabs 10.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

1 2 tentschrift 2 930 199), the borehole through a valve patent claims: like the borehole at its mouth complete the cap first to fill with the mortar and then

1. Pourable rock anchor with an anchor rod on one through the cap without an anchor head hollow anchor rod held, expandable 5 by the plastic already contained in the borehole Drive anchor body and a device for sealing mortar. The cap for the th of the borehole, thereby marked borehole acts to a limited extent as draws that the expandable anchor anchor head, which zenkkörpers the anchor rod in the borehole triert near the outer end of the borehole and inhibits axial displacement. At this is located. io known arrangement is the introduction of the anchor

2. Pourable rock anchor according to claim 1, rod in the already filled with mortar borehole red Through marked that clamping shoes (36, relatively difficult and safe filling of the drilling 37) the expansion device of the anchor body is not possible at the hole due to casting under high pressure.

■ a conical expansion member (35) in the circumferential direction borrowed.

tion. are arranged so that a passage 15 It is the underlying Auffür the invention Air and mortar between the clamping shoes would give such a pourable rock anchor (36, 37) remains. create that is much easier, easier and with

3. Pourable rock anchor according to. Claim 1 greater security also in a very deep borehole or 2, characterized in that the hollow with at least one diametrical drill rod of small diameter in relation to the diameter of the anchor rod (W) can be used, and tion (17) in the Near the mountain-side end which has a perfect potting of the anchor rod (21). Allows over the entire length.

-

4. Castable rock anchor according to claim 1, according to the invention this is achieved by

characterized in that the mountain-side that the expandable anchor body is in the vicinity of the end (21) of the hollow anchor rod (22) with a 25 of the outer end of the borehole.
Attachment piece (23) is provided, which little- This false anchor according to the invention can be

at least one diametrical bore (26), which in with its from the bottom of the hole to the vicinity of the Connection with the bore (24) of the hollow to the borehole mouth completely free anchor rod kerstange (22). simply and easily inserted into the still empty borehole-

30 zen, whereupon the anchor rod is fixed by tightening the anchor head and sealed on its outside is so that he is under high pressure with mortar

be poured over the entire depth of the borehole

can. In addition, an operating table check of the position of the anchor head is carried out from the outside

Visual inspection possible.

The invention relates to a castable rock to cast the anchor rod in the borehole

ker with an anchor head held on a hollow anchor rod behind the expandable anchor body without additional, To allow an expandable anchor body and a Vorrich- Liehe auxiliary means are preferred device for sealing the borehole. 40 the clamping shoes of the spreading device on the conical

Rock anchors of this type are known (USA.-Pa- see spreading member in the circumferential direction in such a way arranged 2 667 037), in which the expandable net that a passage for air and mortar between Anchor body lies at the inner end of the anchor rod. the clamping shoes remains.

In these known rock anchors, the anchor is in order to ensure proper ventilation of the borehole

head at the mountain-side end of the anchor rod. Making this difficult when the mortar is pressed into the borehole not only makes it more difficult to introduce it because of the enlarged diameter without the risk of the larger diameter, but also brings a series of through openings in the anchor rod with it, if there are any other disadvantages. So must z. B. the setting of the mountain-side end face on the borehole adds a relatively large bottom of the hole along its entire length, preferably has a hollow diameter in order to allow the anchor rod to be pushed through at least one diametrical hole in the head of the hole with a hole opposite the anchor rod. Near the mountain-side end.
to allow larger diameter. In order to achieve this, however, the mountainous

the layer of mortar that connects the rock with the anchor-side end of the hollow anchor rod with a pole is thick. Experience shows, however, that clauses can be provided, which carries at least one dia an anchor the better, the thinner the anchor hole has, which is in connection with the concrete layer of the hollow anchor rod connecting the rod with the rock,
is. When using anchor heads developed by Dre The invention is described below with reference to the

hen are set, there is also explained in more detail as a result of the drawing on an exemplary embodiment usually very large length and thus large tert. It shows

Torsional elasticity, in particular a hollow anchor rod 60 Fig. 1 shows an axial section through a borehole with gene, a not inconsiderable difficulty, the anchor rod used according to the invention,
kerkopf to be set safely. In the case of anchor heads which can be set to a cross bar on an enlarged scale by pulling on the anchor bar, the section through the anchor bar along the line ΙΙ-drive means that the gripping shoes are at the beginning of the setting process in FIG. 1,

Ganges not or only insufficiently against the mountains 65 Fig. 3 on an enlarged scale, partly in support and thus the setting difficult or completely cut, the foundation of the anchor rod according to a to make impossible. Modification form of the device according to the invention

To avoid this, it is known (USA.-Pa- dung.