EP1119687B1 - Jacket tube for a drilling and anchoring device - Google Patents

Abstract

A jacket tube for a device for drilling holes and forming an anchorage in the earth or rock. The jacket tube is coupled with a drill pipe and/or a drill bit or a drill hammer and is configured with a plurality of through openings across its periphery. Once the borehole has been made, or after an anchor has been introduced, the jacket tube can be filled with a hardenable suspension. The jacket tube consists of at least one expanded metal element which has evenly distributed through openings and connecting elements, especially sleeves, at the ends for connecting to a drill bit and/or other jacket tube elements. The borehole is therefore easy to produce and the jacket tube can be anchored securely.

Description

The present invention relates to a cladding tube for a device for drilling holes and forming a Anchoring in soil or rock material, with the cladding tube with a drill pipe and / or a drill bit or a hammer drill is coupled and with its scope a plurality of through openings is formed as well after completion of the borehole or after insertion an anchor can be filled with a curable suspension is.

Devices for drilling, in particular for striking or Rotary impact drilling, and subsequent lining of holes in soil or rock material are in different Embodiments known. Hiebei will if necessary long hole or hole formed with the help of a drill bit, which on a drill pipe is stored, with a striking and / or rotating movement of the borehole is formed. To break in of material in which there may be a to avoid long length extending and / or post hole Completion of the drill liner is available To be able to pose, it was suggested, for example, to use a cladding tube surrounding the drill pipe, which is introduced during the drilling process.

After completion of the hole, for example, in an anchor is inserted into the cladding tube or the drill pipe find immediate use as an anchor and a rapidly setting suspension to solidify the surrounding Material are introduced.

A device with a cladding tube of the aforementioned The type can be found, for example, in WO 98/21439, in which a method and device for drilling and lining is revealed by holes. Through a drill pipe, which acts on a drill bit, surrounding cladding tube becomes an annular space between the cladding tube and the outer circumference of the drill pipe provided, for example in the area immediately adjacent to the drill bit at least one passage opening is essentially completely walled Cladding tube is provided, via which degraded Material if necessary from the borehole to be produced removed and a hardenable suspension for anchoring can be spread into the surrounding material.

Instead of inserting a cladding tube together with the formation of the borehole is also a process become known, in which in time-consuming, multiple Steps after completion of the borehole Drill bit removed from the borehole and then a Lining or cladding tube inserted into the borehole becomes. Cladding tubes or sleeve-shaped inserts for such Linings of boreholes are here for example DE-B 21 33 593, AT-B 329 487 or AT-B 262 196 remove. It is understood that such an approach can only be used in those cases material breaking into the completed borehole can be excluded with certainty, being about also drilled a correspondingly enlarged cross section must be carried out to ensure that the lining or envelope tube. To such a thing Insert liner or cladding tube of great length can, this pipe must in turn with a relatively large Wall thickness should be designed to ensure safe insertion allow, so that on the dimensions of the cladding tube coordinated core bit with a relatively large diameter must become.

For the proper anchoring of an anchor and the the jacket surrounding the anchor after application of a hardenable However, suspension is also a corresponding one stable connection with the surrounding material required, to inadvertently remove the anchor to avoid a corresponding burden with certainty can. Hiebei is in the known embodiments of Cladding tubes, such as WO 98/21439, disadvantageous, that they have an essentially smooth surface, as they are usually made of steel or plastic elements are made, so that even with a contribution a suspension over a plurality of passage openings in the cladding tube a partially local penetration of the curable Allows suspension in the surrounding material and an essentially smooth or flat interface between the suspension and the outer surfaces of the cladding tube is achieved so that the anchoring effect in particular partially severely affected in the area of the cladding tube is.

The present invention now aims to provide a cladding tube to create the type mentioned, in addition to a quick and easy lining of the borehole simultaneous introduction of a cladding tube later secure anchoring or additional reinforcement in one Cladding tube to be inserted or use as an anchor finding drill pipe when introducing a curable Suspension, which is at least partially in the Borehole surrounding material is deployed with more reliable Anchoring the cladding tube can be achieved. To the solution of these tasks is the cladding tube according to the invention essentially characterized in that the cladding tube at least one with evenly distributed passage openings provided expanded metal element is formed, which at its ends connecting elements, in particular sleeves, for connection to the drill bit and / or others Has cladding tube elements. The fact that according to the invention Cladding tube formed from at least one expanded metal element is which with a variety of evenly over the circumference of distributed through openings is successful safe, large-scale application of the curable Suspension in the surrounding material after completion of the borehole for setting the anchor, so that a corresponding one secure anchoring of the anchor and the cladding tube is achievable. In addition, by training the Cladding tube ensured from at least one expanded metal element, that the cladding tube is not a perfectly flat, has a smooth outer surface so that after insertion the curable suspension due to the inherent surface design of the expanded metal element or the inherent unevenness the anchoring effect of the surfaces of the expanded metal element in the surrounding material after curing the suspension is increased accordingly. If longer holes are found in a manner known per se divided over the longitudinal extent Cladding tube use, so that several, one behind the other arranged expanded metal elements each via suitable Connecting elements, in particular sleeves, with one another be connected or connect directly to the drill bit. By using an expanded metal element with a corresponding number of passage openings when inserting the cladding tube during the drilling process ensure a high elasticity of the cladding tube so that no obstruction to the drilling process results and a distribution the forces can be achieved over the entire cladding tube. Furthermore, after casting with a curable Suspension an additional, covering the entire Reinforcement effect extending through the length of the cladding tube the expanded metal when securely anchored in the surrounding Get material over the rough surface so that after the hardening a tight fit of the cladding tube and, if necessary anchor recorded therein results, whereby by by increasing the anchoring or reinforcement effect the expanded metal, if necessary, with weaker dimensions Anchoring and smaller dimensions if necessary Drill holes with the resulting material savings and reduced drilling work can be found.

To achieve a large passage cross section for the curable suspension as well as for a correspondingly good one Anchoring effect is according to a preferred embodiment provided that the passage openings of the expanded metal element essentially rhomboid or diamond-shaped Have contours. Such rhomboid or diamond-shaped Contours of the passage openings will be above also ensured during the drilling process that the Through openings not of mined material, which usually an essentially rounded or spherical one Form, completely misplaced and blocked become. In this context, it also becomes special preferably suggested that the expanded metal element a has a lattice or wire mesh-like structure, whereby a correspondingly large, free passage area the one remaining between the individual passage openings Material cross section results in great elasticity when inserting while achieving an increased Reinforcement and anchoring effect after grouting and Curing of the suspension results.

For proper management of at least one Expanded metal element formed cladding tube relative to the drill pipe or an anchor to be set later suggested that an annulus from between the cladding tube and the spacers arranged on the drill pipe or the anchor, especially those in the end areas of the Expanded metal elements (e) provided sleeve elements, defined as is another preferred embodiment corresponds to the device according to the invention.

While by using an expanded metal element for Forming a cladding tube with appropriately large passage cross sections for subsequently hardenable Material as well as a corresponding reinforcement and anchoring effect is achievable exists in the multitude of Through openings, if necessary, the risk of intrusion of water or moisture from the surrounding Material in the area of the anchor, so that the anchor at a stay in, for example, several years the borehole can be damaged by corrosion. For additional protection against intrusion of Moisture to anchor is therefore preferred according to another Embodiment proposed according to the invention that the cladding tube is constructed in multiple layers, wherein between in radial direction on the inner and outer surfaces arranged, formed with through openings expanded metal elements a plastic tube is provided. By this sandwich construction preferred according to the invention from external expanded metal elements and one intermediate plastic pipe can be used for the increased Anchoring effect relevant properties of the expanded metal element be used while over the plastic pipe penetration of moisture to the anchor and the result existing risk of corrosion is largely minimized can be. For applying a suspension to subsequent anchoring must of course be the plastic pipe be provided with appropriate passage openings, wherein particularly preferred in this context is that the plastic tube with a plurality of itself only opening towards the outside of the cladding tube or closable outlet openings, so that such closable outlet openings or Openings that are only due to a valve effect open towards the outside of the borehole safe application of the curable suspension in the surrounding Area is assured while intrusion moisture is avoided. That can be done again a correspondingly secure anchoring in the surrounding material, which, for example, from a so-called overburden or loose mountains are formed, after the suspension has cured, the inherent ones Unevenness of the expanded metal elements accordingly can achieve good anchoring effect and at the same time a seal against any existing Moisture occurs through the plastic tube.

Especially with one of a multi-layer sandwich construction formed cladding tube is used for the fasteners or sleeves according to a further preferred embodiment proposed that the connecting elements formed by sleeves a graded or with offset areas Have formed contour on which the inside and external expanded metal elements and the intermediate Plastic pipe can be fixed.

For easy transport of the multi-layer in particular Cladding tube during the drilling process, which is already an appropriate protective effect during the drilling process can be achieved for the drill string is also preferred provided that the cladding tube under tension with the drill bit, if necessary with interposition a coupling element, in particular one on the drill bit acting impact shoe, can be coupled.

Fig. 1 eine schematische Seitenansicht, teilweise im Schnitt, eines erfindungsgemäßen Hüllrohres für eine Vorrichtung zum Bohren, wobei zusätzlich Teile der Bohrvorrichtung angedeutet sind;

Fig. 2 eine Seitenansicht eines erfindungsgemäßen, aus einem Streckmetallelement hergestellten Hüllrohres; und

Fig. 3 in vergrößertem Maßstab einen teilweisen Schnitt durch eine abgewandelte Ausführungsform eines erfindungsgemäßen, mehrlagigen Hüllrohres.

The invention is explained in more detail below with the aid of exemplary embodiments schematically illustrated in the accompanying drawing. In this show:

Figure 1 is a schematic side view, partly in section, of a cladding tube according to the invention for a device for drilling, wherein parts of the drilling device are additionally indicated.

2 shows a side view of a cladding tube according to the invention made from an expanded metal element; and

Fig. 3 on an enlarged scale, a partial section through a modified embodiment of a multi-layer cladding tube according to the invention.

In Fig. 1 is schematically 1 with a drill bit for training designated a borehole, the outer contour with 2 is indicated, wherein for driving the drill bit 1 is a schematic with 3 indicated drill pipe is used. Immediately with the drill bit 1 on that of the drilling elements 4 facing away from the impact shoe 5 of the drill bit 1 a cladding tube 6 is provided, the cladding tube 6, such as this can be seen particularly clearly from FIG. 2 Expanded metal elements is formed, which at their end regions for connection to the drill bit 1 or the impact shoe 5 as well as with neighboring cladding tube elements 6 each are formed with sleeve elements 7 and 8. The sleeve elements 7, 8 can be used to achieve a corresponding one Plug or screw connection to be formed especially with large dimensions of a borehole corresponding extension of the cladding tube 6 similar to the extension to enable the drill pipe 3.

Such a cladding tube or expanded metal element 6 is hiebei clearly shown in Fig. 2, which can be seen is that the evenly distributed over the circumference Through openings of the expanded metal element formed cladding tube 6 essentially each rhomboid or diamond-shaped contours 9, so that overall for the surface of the cladding tube 6 a grid or mesh-like structure results.

After completion of hole 2 will either take place immediately the drill pipe 3 is used as an anchor or after a removal of the drill pipe 3 with at least parts the drill bit 1 a separate anchor in the finished Bore 2 and introduced into the interior of the cladding tube 6, whereupon a inside of the cladding tube 6 curable suspension is introduced, which over the in the expanded metal element 6 formed through openings 9 can escape into the surrounding material. After curing the suspension is therefore extremely resistant Anchoring in completed borehole 2, whereby the anchoring effect supports in particular is that due to the not completely flat surface quality of the expanded metal element 6 a corresponding secure anchoring of the cladding tube 6 under training an additional reinforcement effect in addition to the anchoring of the anchor in the hardened suspension becomes.

In Fig. 3 is a partial section through on an enlarged scale a modified embodiment of a schematically with 10 indicated cladding tube shown, the multilayer Cladding tube 10 from an external, again with a Large number of perforated expanded metal elements 11, an inside, provided with openings Expanded metal element 12 and an intermediate plastic tube or element 13 is formed. The expanded metal elements 11 and 12 in turn have an education or Condition similar to that shown in Figs. 1 and 2 Expanded metal element 6 with a variety of rhomboid or diamond-shaped passage openings 9. In contrast is the intermediate plastic tube 13 with a reduced Number of openings formed, in Fig. 3 one of the openings 14 is indicated, which in the sense a valve effect a passage of subsequently to be applied Suspension only in the direction indicated by arrow 15 indicated direction allows. It is thus in the Fig. 3 illustrated embodiment ensures that after introduction of the suspension to form an anchor no moisture from the surrounding material or no water towards the drill string 3 or one penetrate anchor to be arranged instead of the drill pipe 3 can, so that a corrosion effect is avoided and such anchors, which have also been used for many years Well can remain, can be produced.

In the embodiment of the cladding tube shown in FIG. 3 10 finds a modified design of a sleeve 16 with stepped areas 17 use to the definition of the individual layers or elements 11, 12 and 13 to form the sandwich-like structure of the cladding tube 10 to enable. In addition, in Fig. 3 additional spacer or an extension of the sleeve element 18 indicated a corresponding positioning relative to the drill pipe 3 or an anchor to be set to allow, being the centerline of the overall construction is designated by 19 in all figures.

Claims (8)

1. A jacket tube (6) for a device for drilling holes and forming an anchorage in soil or rock material, wherein the jacket tube (6) is coupled with a drill rod assembly (3) and/or a drill bit (1) or a drilling hammer, respectively, and is formed with a plurality of passage openings (9) about its circumference and capable of being filled with a curable suspension after completion of the drill hole (2) or after insertion of a roof bolt, characterized in that the jacket tube (6, 10) is formed of at least one expanded metal element (6, 11, 12) provided with uniformly distributed passage openings (9) and comprising, on its ends, connecting elements (7, 8, 16), in particular sleeves, for connection with the drill bit (1) and/or further jacket tube elements (6, 10).
2. A jacket tube according to claim 1, characterized in that the passage openings (9) of the expanded metal element (6, 11, 12) have substantially rhomboidal or lozenged contours.
3. A jacket tube according to claim 1 or 2, characterized in that the expanded metal element (6, 11, 12) has a grid-like or wire netting-like structure.
4. A jacket tube according to claim 1, 2 or 3, characterized in that an annular space is defined by spacers (18) arranged between the jacket tube (6, 10) and the drill rod assembly (3) or roof bolt, respectively, in particular sleeve elements (7, 8, 16) provided in the end regions of the expanded metal element(s).
5. A jacket tube according to any one of claims 1 to 4, characterized in that the jacket tube (10) is designed in several layers with a synthetic tube (13) being provided between expanded metal elements (11, 12) designed with passage openings (9) and arranged on the inner and outer surfaces, viewed in the radial direction.
6. A jacket tube according to claim 5, characterized in that the synthetic tube (13) is designed with a plurality of outlet openings (14) opening and closeable merely in the direction towards the outer side of the jacket tube (10).
7. A jacket tube according to claim 5 or 6, characterized in that the connecting elements formed by sleeves (16) have stepped contours or contours formed with offset regions (17), on which the internally and externally arranged expanded metal elements (11, 12) and the intermediate synthetic tube (13) are fixable.
8. A jacket tube according to any one of claims 1 to 7, characterized in that the jacket tube (6, 10) under tensile actuation is capable of being coupled with the drill bit (1) or the drilling hammer, respectively, optionally by interposing a coupling element, in particular an impact shoe acting on the drill bit (1).

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