AU2009207825B2

AU2009207825B2 - Anchor tube and method for production thereof

Info

Publication number: AU2009207825B2
Application number: AU2009207825A
Authority: AU
Inventors: Ferdinand Coerschulte; Ernst Friedrich Ischebeck
Original assignee: Friedr Ischebeck GmbH
Current assignee: Friedr Ischebeck GmbH
Priority date: 2008-01-25
Filing date: 2009-01-08
Publication date: 2014-06-05
Anticipated expiration: 2029-01-08
Also published as: CA2713190A1; AU2009207825C1; EP2238313B1; ATE533919T1; CA2713190C; ZA201004186B; EP2238313A1; CN101925721A; DE102008006235A1; AU2009207825A1; WO2009092630A1; CN101925721B

Abstract

The invention relates to a method for production of anchor tubes (1), for injection anchors with a static mixer (6), positionally fixed in the longitudinal direction, wherein starting from a preferably hot-rolled tube (2), at least one static mixer (6) is inserted in the tube drilling (3) and then a profile (13) is rolled into the outer surface (4) of the tube (2) eine Profilierung (13), with at least local cross-sectional reduction of the tube drilling and the static mixer (6) is located in the longitudinal direction as a result of the cross-sectional reduction. According to the invention, an advantageous improvement can be made wherein a sleeve element (5) is introduced into the tube drilling (3) before rolling in the profile (13) which encloses the static mixer (3) in the tuber drilling (3) at least in a longitudinal section of the static mixer (6) and which has a lower hardness than the static mixer (6). The invention further relates to an anchor tube for injection anchors which may be produced by said method.

Description

1 Anchor tube and method for the production thereof A reference herein to a patent document or other matter which is given as prior art is not to be taken as an admission that 5 that document or matter was known or that the information it contains was part of the common general knowledge as at the priority date of any of the claims. Throughout the description and claims of the specification, the 10 word "comprise"! and variations of the word, such as "comprising" and "comprises", is not intended to exclude other additives, components, integers or steps. The present invention relates in first instance to a method for 15 producing anchor tubes for injection anchors, starting with a tube blank that is preferably hot-rolled and firstly introducing a static mixer into the bore of said tube and subsequently rolling into the outer circumferential surface of the tube a profiling, preferably a thread extending over a 20 portion or all of the length thereof, while at the same time the cross-section of the tube bore is reduced, at least locally, and the static mixer being fixed in its position in the longitudinal direction as a result of the reduction in cross-section. 25 Anchor tubes of this type are used as a component of injection drilling anchors, which are for example drilled into a rock face for securement, into the face of a void in an opencast excavation, into a bedrock or the like and are grouted in the 30 drill hole formed by means of a curing grouting compound and thereby secured. The injection drilling anchor generally has for this purpose at its front end a drill bit and, inside the anchor, an injection channel running through it centrally in the longitudinal direction, through which the grouting compound 1a can be supplied and which has, at its front end outlet, openings opening out to the outside of the anchor. Such an injection anchor may have one, or more if need be, anchor tubes which are connected by means of couplings and which carry on 5 their outer circumferential surface an anchor thread over a portion or all of the length thereof. This improves the bonding effect with the grouting compound and may also serve for connecting anchor rods to the drill bit and to one another by means of couplings as well as for fastening to a rearward 10 injection head. The injection head has a flushing head, through which for example a flushing agent (e.g. air or water) is WO 2009/092630 PCT/EP2009/050156 -2 introduced during drilling and, for grouting, one or more supply components are introduced under pressure into the injection channel. The preferred grouting compounds also include two-component resins, the two 5 components of which cure after a short time once they come into contact with each other. Such supply components are therefore supplied to the injection head separately, so that they only come together after entering the injection channel or shortly before, in a 10 lost part fitted at the end of said channel. In order to achieve good mixing of the components by the time they exit into the drill hole, it is known to dispose one or more so-called static mixers, fixed in position, in the injection channel. This is a flow obstacle, 15 formed from so-called chicanes, which, when flowed through by the two components, brings about thorough mixing thereof as a result of the way in which it is configured, for example with ribs, helixes etc. In order to prevent the static mixer from being carried 20 along by the flow pressure of the supply components, various techniques are used. In the prior art, it is known from DE 102007005540 Al for static mixers to be rolled into the tube bore that runs centrally through as a supply channel in anchor tubes of injection 25 drilling anchors. In practice, anchor tubes of steel and preferably static mixers of plastics material are generally used. The anchor tubes are often produced by using a tube blank which, in the unworked initial state, still has a comparatively low inner and outer 30 surface quality and may have tolerances in terms of its dimensions and shape. In particular, the tube blank sometimes even has an unround cross-section of the bore and/or outer cross-section, for example a polygonal or even multi-cornered cross-section. The desired static 35 mixer must have a diameter that allows it to be pushed axially into the tube bore before the rolling-in of the profiling. However, on account of said tolerances in terms of dimensions and size, the desired small and 3 uniform tolerancing in the cross-section of the bore is not always achieved, so that the static mixers cannot always be rolled into the bore of all injection anchors in the known manner, and there is the risk of the static mixers becoming damaged. Against this background, it is therefore desirable to develop a method of the type mentioned at the beginning advantageously such that, in particular, the aforementioned disadvantages are avoided as far as possible. According to the present invention, there is provided method for producing anchor tubes for injection anchors with a static mixer fixed in its position in the longitudinal direction, starting with a tube and firstly introducing a static mixer into the bore of said tube and subsequently rolling into the outer circumferential surface of the tube a profiling, while at the same time the cross-section of the tube bore is reduced, at least locally, and the static mixer being fixed in its position in the longitudinal direction as a result of the reduction in cross-section, wherein before the rolling-in of the profiling, a sheathing element which surrounds the static mixer in the tube bore, at least over a portion of the length thereof, and has a lower hardness in comparison with the static mixer, is introduced into the tube bore. The axial fixing or the static mixer results from the sheathing element being clamped and fixed to the wall of the bore in the longitudinal direction by the reduction in cross-section that occurs during the rolling of the profiling into the tube bore, and by it thereby also undergoing for its part a certain reduction in cross-section with respect to the inner cross- 3a section of the sheathing element, by which the static mixer is clamped in place and fixed in the longitudinal direction on the inner wall of the sheathing element. Consequently, after the rolling of the profiling, the sheathing element and the static mixer are both held immovably in the tube bore, so this could almost be described as a two-stage process of pressing-in in the radial direction. According to the invention, the sheathing element has a lower hardness and/or lower strength than the static mixer. The tubes used for producing anchor tubes generally consist of steel or a comparable material, with therefore a WO 2009/092630 PCT/EP2009/050156 -4 comparatively high hardness and strength. To this extent it follows, or is preferred, for the material of the sheathing element also to have a lower hardness and/or a lower strength in comparison with the outer 5 anchor tube. It is preferred to this extent for the material of the sheathing element to have the lowest hardness and/or the lowest strength in comparison with the materials of the static mixer and the anchor tube. If an anchor tube of steel and a static mixer of 10 plastics are preferably used, the anchor tube may have the highest hardness and/or strength of all the components. By having a hardness that is lower in comparison with the static mixer, and to this extent generally also in comparison with the anchor tube, at 15 least on its surface, the sheathing element compensates for the tolerances described at the beginning, without the static mixer undergoing any damage. Tolerances of the tube that cannot be compensated by the static mixer can be compensated by the sheathing element on account 20 of its easier deformability in comparison with the static mixer. The invention consequently makes it possible that static mixers can also be rolled into blanks or anchor tubes with comparatively greater tolerances, so that on the one hand the quality of the 25 finished anchor tubes can be improved and on the other hand costs can be saved. A portion of the length of a tube or a hose may preferably be used as the sheathing element, this 30 portion preferably being of the same length as the static mixer, but it may also be of a different length. To this extent, the sheathing element is a part that is separate from the static mixer. It is also preferred for this piece of tube or the piece of hose to have 35 such good deformability that it can, within certain limits, be easily deformed manually with respect to its cross-section. In this way, insertion even into an unround tube bore, even with little freedom of WO 2009/092630 PCT/EP2009/050156 - 5 movement, and compensation for even relatively great tolerances is made easier. For this purpose, the sheathing element may preferably have a comparatively low modulus of elasticity. To this extent, an 5 elastically deformable hose of plastics or rubber is well suited. With regard to the method according to the invention, it is also preferred that firstly the static mixer is introduced into the sheathing element and then the two parts are introduced together into the 10 bore of the blank or into the tube bore. It is regarded as suitable that the outer cross-section of the sheathing element, in particular the outer diameter thereof, is approximately the same size or somewhat smaller than the cross-section of the tube bore, in 15 particular therefore than the diameter of the tube bore before the rolling-in of the profiling. In connection with this, it is preferred to use a static mixer of which the cross-section, in particular the outer diameter thereof, is approximately the same size or 20 somewhat smaller than the hollow cross-section, in particular the inner diameter, of the sheathing element. Also in this case, if a sheathing element with sufficiently easy deformability is used, it is possible for said sheathing element, with the static 25 mixer inserted in it, to be inserted into a tube bore which is, for example, unround in cross-section (for example polygonal or multi-cornered) before the rolling-in of the profiling and which is possibly also uneven in the longitudinal direction. To this extent, 30 tubes which have an unround delimitation (for example polygonal or multi-cornered) overall, that is also on the outer circumferential surface, may also be used as blanks for producing the anchor tubes. A static mixer which has spiral volute portions that are adjacent to 35 one another in the longitudinal direction of the mixer and are twisted with respect to one another at the circumference and the preferably rib-like outer periphery of which lies at an imaginary cylindrical WO 2009/092630 PCT/EP2009/050156 -6 enveloping surface, may preferably be used. In particular whenever the static mixer has angular or even sharp edges at its outer peripheries, these can cut into the softer sheathing element somewhat during 5 the overrolling or rolling-in of the profile, as a result of which additional compensation for tolerances and improved axial fixing are made possible. A suitable development of the method provides that the static mixer and the sheathing element are introduced 10 into the tube bore while leaving a free end portion of the tube bore. A subsequent method step may comprise widening the end portion of the tube bore in its diameter, preferably after the rolling-in of the profiling, preferably doing so by drilling it out, and 15 subsequently finely working it on the surface. This working may take place in particular in a separate end working station, it being possible for the swarf that is formed during the working of the end portion to be blown out from the other side, that is to say through 20 the already fixed static mixer. Furthermore, it is possible for at least a front elongate portion of an injection connector, which has an inner hollow space, separate inlet openings for various supply components to be supplied to the anchor rod and an outlet opening 25 disposed at the front longitudinal portion, to be forced axially into the widened end portion with frictional engagement. If need be, a protective cap may be fitted onto the rear end along the length of the injection connector that protrudes out of the tube 30 bore. Such a combination of an anchor rod with an injection connector forced axially into its end with frictional engagement is also independently of importance within the scope of the invention, i.e. without the other features mentioned. The unit formed 35 by the anchor rod and injection connector may be preassembled in large numbers and then supplied to an injection head for drilling-in and grouting drilling injection anchors, in particular by being fed from a 7 magazine for automated operation. Depending on the desired configuration of the injection connector, it may, for example, be inserted into a recess in a rotatable inner part of the flushing head, the recess being geometrically matched to the rear elongate portion of the connector. The invention also relates to an anchor tube for injection anchors, in the outer circumferential surface of which a profiling, preferably a thread extending over a portion or all of the length thereof, is rolled in and in the tube bore of which a static mixer is fixed in its position in the longitudinal direction as a result of the reduction in cross section, at least locally, of the tube bore that results when the profiling is rolled in. On the basis of the prior art cited at the beginning, it is therefore desirable to develop an anchor tube of this type advantageously such that, in particular, the aforementioned disadvantages are avoided as far as possible. According to another aspect of the present invention, there is provided anchor tube for injection anchors, in the outer circumferential surface of which a profiling, particularly a thread extending over a portion or all of the length thereof, is rolled in and in the tube bore of which a static mixer is fixed in its position in the longitudinal direction as a result of the reduction in cross-section, at least locally, of the tube bore that results when the profiling is rolled in, wherein the static mixer is surrounded, at least over a portion of the length thereof, within the tube bore by a sheathing element in that the sheathing element has a lower hardness in comparison with the 7a static mixer, and in that the sheathing element and the static mixer are fixed in their position in the longitudinal direction as a result of the reduction in cross-section, at least locally of the tube bore that results when the profiling is rolled in. It is preferably provided that the material of the sheathing element has a lower hardness and/or a lower strength than the material of the static mixer, but to this extent it is also adequate if there is an appropriate graduation with respect to the surfaces WO 2009/092630 PCT/EP2009/050156 -8 coming into contact. With respect to the effects and advantages that can be achieved by the invention and possible developments in these respects, reference is made to the foregoing and following description. In 5 particular, it is preferred that a piece of tube or a piece of hose is provided as the sheathing element. It is preferably possible for a static mixer of plastics material and a sheathing element of plastics or rubber to be combined. Suitable in particular is a flexible 10 hose of plastics that can be deformed manually in its cross-section. It is also regarded as suitable if the sheathing element and the static mixer are of the same length. As far as the static mixer is concerned, it is preferred that it has spiral volute portions that are 15 adjacent to one another in the longitudinal direction and are twisted with respect to one another at the circumference and the preferably rib-like outer periphery of which lies at an imaginary cylindrical enveloping surface. The static mixer and the sheathing 20 element may be disposed in the tube bore, leaving an end portion undisturbed. At least a front elongate portion of an injection connector, which has an inner hollow space, separate inlet openings for various supply components to be supplied to the anchor rod and 25 an outlet opening disposed at the front longitudinal portion, may be forced axially into said end portion with frictional engagement. Said injection connector may preferably be produced from a plastics material, more preferably from polyamide, in particular in one 30 piece as an injection molding. The invention is further described below with reference to the accompanying figures, which show a preferred exemplary embodiment and in which: 35 Figure 1 shows a longitudinal section of a tube, which by way of example is suitable for producing an anchor tube according to the invention as WO 2009/092630 PCT/EP2009/050156 -9 provided by a preferred embodiment, represented in a shortened form by being broken up; 5 Figure la shows a sectional view along section line Ia - Ia in Figure 1; Figure 2 shows by way of example a longitudinal section of a sheathing element, which is 10 suitable for producing an anchor tube according to the invention as provided by a first preferred embodiment, represented in a shortened form by being broken up; 15 Figure 2a shows a sectional view along section line IIa - IIa in Figure 2; Figure 3 shows by way of example a longitudinal section, represented in a shortened form by 20 being broken up, of a static mixer, which is suitable for producing an anchor tube according to the invention as provided by a preferred embodiment; 25 Figure 3a shows a sectional view along section line IIIa - IIIa in Figure 3; Figure 4 shows a longitudinal section, in a shortened form by being broken up, of an anchor tube 30 according to the invention as provided by a preferred embodiment after the rolling-in of the sheathing element and the static mixer; Figure 5 shows a longitudinal section of the anchor 35 tube shown in Figure 4, simplified in a schematic form; WO 2009/092630 PCT/EP2009/050156 - 10 Figure 6 shows the anchor tube shown in Figure 5 after further working and Figure 7 shows the anchor tube shown in Figure 6 with 5 an injection connector inserted therein, according to a preferred exemplary embodiment. The method according to the invention for producing 10 anchor tubes 1 by a procedure preferred for this purpose is described with reference to Figures 1 to 7 and the anchor tube 1 according to the invention as provided by a likewise preferred embodiment and a possible development are described with reference to 15 Figures 4 to 7. Figures 1 and la show by way of example a hot-rolled tube 2 which is used as a semifinished product or blank for the production of said anchor tube and may have, for example, an overall length (shown in a shortened form) of 2.5 m (or some 20 other length) and, for example a diameter in the range of 30-40 mm (or some other diameter). In the example chosen, it is a steel tube with a tube bore 3 running through it centrally along the longitudinal direction L thereof. In the section of Figure la, it is 25 schematically shown that the tube bore 3 has a cross section which, though round, deviates from an exact circular shape by schematically indicated tolerances, the diameter of which, therefore, is to this extent only approximately D 1 . The outer circumferential 30 surface 4 of the tube 2 is also approximately cylindrical, i.e. is subject to certain tolerances (not represented). Figures 2 and 2a show a sheathing element 5, which in 35 the example chosen is a portion of the length of a hose made of plastics material. This plastics material may preferably be polyethylene (PE) or polyamide (PA) , for example with a yield stress of 15-45 N/mm 2 . Its outer WO 2009/092630 PCT/EP2009/050156 - 11 diameter D 2 is approximately the same or slightly smaller than the diameter D 1 . In the example chosen, the diameter Di of the unround tube bore is about 12-13 mm (also dependent on the direction measured) and the 5 diameter D 2 is 12.5 mm, with a wall thickness of the sheathing element 5 of 1.25 mm. Figure 3 shows a so-called static mixer 6 as provided by a preferred embodiment. This is produced from 10 plastics, in the specific example from polyacetal (POM) , the yield stress of which is in the range of about 65-75 N/mm 2 . In the example, the material of the static mixer 6 consequently has a higher strength than the material of the plastics hose of the sheathing 15 element 5. The static mixer 6, which is altogether of one piece but shown in a shortened form by being broken up, has in the example an overall length of 600 mm and at the same time has 48 so-called chicanes 7, which lie one after the other in the longitudinal direction L. 20 Each chicane 7 is formed by two spiral volute portions 8, which are twisted in terms of their angle with respect to one another by 1800 in the same elongate portion and for their part extend in each case over half a revolution. Chicanes 7 that are adjacent in the 25 longitudinal direction L have respectively opposed helix pitches and are offset in their angle with respect to one another by a quarter turn about the longitudinal axis, so that the structure can be flowed through in the longitudinal direction L. The rib-like 30 outer periphery 9 of the spiral volute portions 8 has angular edges, the outer peripheries 9 lying at an imaginary cylindrical enveloping surface 10 that is indicated in Figures 3 and 3a by dashed lines. In the example chosen, the static mixer 6 has an outer 35 diameter D 4 , which like the inner diameter D 3 of the sheathing element 5, is about 10 mm. It goes without saying, however, that deviations from all the aforementioned dimensions, in particular diameters, and WO 2009/092630 PCT/EP2009/050156 - 12 how they relate, are also possible within the scope of the invention. The plastics material chosen for the sheathing element 5 has a lower hardness and easier deformability than the plastics chosen for the static 5 mixer 6. For producing the anchor tube 1 according to the invention that is shown in Figures 4 and 5 in a f irst preferred embodiment, firstly the static mixer 6 is 10 inserted into the sheathing element 5, which in the example is of the same length, and then the two parts 5, 6, inserted one in the other, are together inserted through an end opening 11 in the longitudinal direction L into the tube bore 3 and pushed in therein from the 15 end face of the tube 2 by a distance A, leaving an end portion 12. In spite of the tolerances in terms of the shape and dimensions of the tube bore 3 and the small amount of lateral play determined by the chosen diameters D 1 to D 4 , the sheathing element 5 and the 20 static mixer 6 can be pushed in up to this longitudinal position, also shown in Figure 5, without any problem as a result of the low hardness and strength of the sheathing element 5 and the chosen relative sizes described above. In a next method step, a profiling 25 13, here in the form of a trapezoidal anchor thread 14, is rolled into the outer circumferential surface 4 of the tube 2, the technique that is in fact suitable for thread rolling being known to the person skilled in the art. Figure 4 pictorially shows the ridges 15 and 30 grooves 16 of the anchor thread 13, which in the drawing of Figures 5 to 7 is only represented in a schematically simplified form. The rolling-in of the anchor thread 14 takes place under compressive loading, which leads to a certain upsetting and resultant 35 reduction in the cross-section of the tube oriented transversely to the longitudinal direction L. The deformations occurring thereby also specifically cause an at least local cross-sectional reduction of the tube WO 2009/092630 PCT/EP2009/050156 - 13 bore 3. Figure 5 shows, in a sectional view of a schematically simplified form, that on account of the cross-sectional reduction caused by the rolling, the inner surface 17 of the tube bore 3 now lies face to 5 face against the outer side of the sheathing element 5, the tolerances in terms of the shape and dimensions (not represented in the drawing of Figure 5) being compensated by the comparatively soft sheathing element 5 as a result of corresponding local deformations. 10 Depending on the rolling-in conditions, it is possible for a certain constriction or cross-sectional reduction of the tube bore 3 to occur either only in the region of the thread grooves 16 or along the entire thread. At the same time, the diameters Di to D 4 are made to 15 match each other and the rolling-in conditions and the sheathing element 5 in such a way that the narrowing of the tube bore 3 also leads to a certain compression of the sheathing element 5 and a reduction in the hollow cross-section thereof, i.e. to a lessening of its inner 20 diameter D 3 . As a result of this, the inner surface 18 of the sheathing element 5 is pressed radially inward against the rib-like outer periphery 9 of the spiral volute portions 8 of the static mixer 6. In this case, the comparatively lower hardness of the sheathing 25 element 5 also allows to this extent certain deformations in the walls thereof, by which tolerances are compensated. It becomes clear that the sheathing element 5 is then fixed in the longitudinal direction L in the bore 3 by the clamping force externally produced 30 and that the static mixer 6 is fixed in the longitudinal direction in the sheathing element 5 by the clamping force externally produced during the rolling-in, so that it is therefore ultimately also fixed with respect to the tube 2 itself. If, during 35 the rolling-in of the profiling 13, there is a cross sectional narrowing that is greater than the compression required for the axial fixing of the sheathing element 5 and the static mixer 6, the WO 2009/092630 PCT/EP2009/050156 - 14 sheathing element 5 allows, by its lower hardness in comparison with the static mixer 6, that the spiral volute portions 8 press, or possibly even cut, into the inner surface of the sheathing element 5 with their 5 sharp outer periphery 9. In this way, otherwise possible damaging, or possibly even rupturing, of the static mixer 6 is prevented. Figure 6 shows the anchor tube 1 as provided by a 10 further possible method step according to a preferred development of the method according to the invention. In this case, the end portion 12 of the tube bore 3 has been enlarged somewhat beyond the original diameter D 1 , in the example chosen drilled out, and subsequently 15 finely worked. At the same time, working of the end face 19 has been performed, in order to make it smooth as shown. Figure 7 shows, as a preferred further possibility, 20 that a front elongate portion 20 of an injection connector 21 has been forced into the widened end portion 12 with frictional engagement. The injection connector 21 has an inner hollow space 22 with prepared separate inlet openings 23, 24 for various supply 25 components to be supplied to the anchor rod I during grouting operation, as well as an outlet opening 25, which is at the front elongate portion 20 and opens out into the tube bore 3 serving as an injection channel. During the finishing, the diameter of end portion 12 30 has been matched to the outer diameter of elongate portion 20 of the injection connector 21, or to the outer diameter of the axially spaced-apart annular ridges provided there, not represented any more specifically in Figure 7, in such a way that a great 35 tensile force would be required to pull the injection connector 21 out of the anchor tube 1. The rear elongate portion 26 is intended for the purpose of entering a recess geometrically matched to it on an WO 2009/092630 PCT/EP2009/050156 - 15 injection head for supplying the supply components (for example the two components of a two-component resin) on a rotationally driven inner part, so that the prepared inlet openings 23, 24 are in line with outlet openings 5 of separate supply lines for the supply components. A torque-transmitting connection of the anchor rod 1 is possible by screwing its anchor thread 13 into a matching threaded bore in the rotationally driven inner part of the flushing head. A further special feature 10 of the injection connector 21 is that, before it is used for the first time, its inlet openings 23, 24 are still closed by predetermined breaking points in the form of reductions in the wall thickness. These only tear when they are subjected to pressure by a flushing 15 agent or by the components of the grouting compound used, the adjacent, cross-sectionally wedge-shaped wall regions acting as resilient valve flaps. A separate further static mixer 28 is fitted into the front portion of hollow space 22 that is axially delimited by 20 an annular shoulder 27. This static mixer does not require any further fixing, thus also does not require, in particular, any clamping connection to the injection connector 21. Instead, its rearward axial movement is limited by the annular shoulder 27 and its forward 25 axial movement is limited by the separate static mixer 6, which is fixed in its position in relation to the anchor tube 1 in the way described above. All features disclosed are (in themselves) pertinent to 30 the invention. The disclosure content of the associated/accompanying priority documents (copy of the prior patent application) is also hereby incorporated in full in the disclosure of the application, including for the purpose of incorporating features of these 35 documents in claims of the present application.

Claims

1. Method for producing anchor tubes for injection anchors with a static mixer fixed in its position in the longitudinal direction, starting with a tube and firstly introducing a static mixer into the bore of said tube and subsequently rolling into the outer circumferential surface of the tube a profiling, while at the same time the cross-section of the tube bore is reduced, at least locally, and the static mixer being fixed in its position in the longitudinal direction as a result of the reduction in cross-section, wherein before the rolling-in of the profiling, a sheathing element which surrounds the static mixer in the tube bore, at least over a portion of the length thereof, and has a lower hardness in comparison with the static mixer, is introduced into the tube bore.

2. A method according to claim 1 wherein the tube is hot rolled.

3. A method according to claims 1 or 2 wherein the profiling is a thread extending over a portion or all of the length thereof.

4. Method according to any one of claims 1 to 3 wherein a piece tube or a piece of hose is used as the sheathing element.

5. Method according to any one of the preceding claims wherein firstly the static mixer is introduced into the sheathing element and then the two parts are introduced together into the tube bore. 17

6. Method according to any one of the preceding claims, including using a sheathing element of which the outer cross-section, is approximately the same size or somewhat smaller than the cross-section of the tube bore.

7. A method according to claim 6 wherein the outer diameter of the sheathing element is the same size or somewhat smaller than the diameter of the tube bore before the rolling-in of the profiling.

8. Method according to any one of the preceding claims including using a static mixer of which the cross-section, is approximately the same size or somewhat smaller than the hollow cross-section, of the sheathing element.

9. A method according to claim 8 wherein the outer diameter of the static mixer is the same size or somewhat smaller than the inner diameter of the sheathing element.

10. Method according to any one of the preceding claims including using a static mixer which has spiral volute portions that are adjacent to one another in the longitudinal, direction and are twisted with respect to one another at the circumference and the, outer periphery of which lies at an imaginary cylindrical enveloping surface.

11. A method according to claim 10 wherein the outer periphery is rib-like.

12. Method according to any one of the preceding claims wherein the static mixer and the sheathing element are introduce 18 into the tube bore while leaving a free end portion of the tube bore.

13. Method according to any one of the preceding claims wherein the end portion of the tube bore is widened in its diameter, and subsequently finely worked on the surface.

14. A method according to claim 13 wherein the tube bore is widened in its diameter after the rolling-in of the profiling.

15. A method according to claims 13 or 14 wherein the tube bore is drilled out.

16. Method according to any one of the preceding claims wherein at least a front elongate portion of an injection connector, which has an inner hollow space, separate inlet openings for various supply components to be supplied to the anchor rod and an outlet opening disposed at the front longitudinal portion, is forced axially into the widened end portion with frictional engagement.

17. Anchor tube for injection anchors, in the outer circumferential surface of which a profiling, particularly a thread extending over a portion or all of the length thereof, is rolled in and in the tube bore of which a static mixer is fixed in its position in the longitudinal direction as a result of the reduction in cross-section, at least locally, of the tube bore that results when the profiling is rolled in, wherein the static mixer is surrounded, at least over a portion of the length thereof, within the tube bore by a sheathing element in that the sheathing element has a 19 lower hardness in comparison with the static mixer, and in that the sheathing element and the static mixer are fixed in their position in the longitudinal direction as a result of the reduction in cross-section, at least locally of the tube bore that results when the profiling is rolled in.

18. Anchor tube according to claim 17 wherein a piece of tube or a piece of hose is provided as the sheathing element.

19. Anchor tube according to claims 17 or 18 wherein a static mixer of plastics material and a sheathing element of plastics or rubber is provided.

20. Anchor tube according to any one of claims 17 or 19 wherein the static mixer has spiral volute portions that are adjacent to one another in the longitudinal direction and are twisted with respect to one another at the circumference and the outer periphery of which lies at an imaginary cylindrical enveloping surface.

21. An anchor tube according to claim 20 wherein the outer periphery is rib-like.

22. Anchor tube according to any one of claims 17 to 22 wherein the static mixer and the sheathing element are disposed in the tube bore leaving an end portion of the tube bore undisturbed.

23. Anchor tube according to any one of claims 17 to 22 wherein at least a front elongate portion of an injection connector, which has an inner hollow space separate inlet openings for various supply components to be supplied to the anchor rod 20 and an outlet opening disposed at the front longitudinal portion, is forced axially into the end portion with frictional engagement.

24. At least one of a method of producing anchor tubes; an anchor tube; substantially as herein described with reference to any one of the accompanying drawings of an embodiment of the invention.