CA2713190C - Anchor tube and method for production thereof - Google Patents
Anchor tube and method for production thereof Download PDFInfo
- Publication number
- CA2713190C CA2713190C CA2713190A CA2713190A CA2713190C CA 2713190 C CA2713190 C CA 2713190C CA 2713190 A CA2713190 A CA 2713190A CA 2713190 A CA2713190 A CA 2713190A CA 2713190 C CA2713190 C CA 2713190C
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- Canada
- Prior art keywords
- tube
- static mixer
- sheathing element
- anchor
- bore
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 5
- 230000003068 static effect Effects 0.000 claims abstract description 79
- 238000002347 injection Methods 0.000 claims abstract description 38
- 239000007924 injection Substances 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000009467 reduction Effects 0.000 claims abstract description 16
- 238000005096 rolling process Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 15
- 239000004033 plastic Substances 0.000 claims description 15
- 229920003023 plastic Polymers 0.000 claims description 15
- 239000011796 hollow space material Substances 0.000 claims description 6
- 238000005553 drilling Methods 0.000 abstract description 10
- 150000001875 compounds Chemical class 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000004952 Polyamide Substances 0.000 description 3
- 229920002647 polyamide Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920006324 polyoxymethylene Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229930182556 Polyacetal Natural products 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/025—Grouting with organic components, e.g. resin
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Piles And Underground Anchors (AREA)
- Forging (AREA)
- Dowels (AREA)
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.
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
CA 2,713,190 Blakes Ref: 76576/00002
2
3 FIELD OF THE INVENTION
4 The present invention relates in first instance to a method for producing anchor tubes for injection anchors, starting with a tube blank that is preferably hot-rolled and firstly introducing a 6 static mixer into the bore of said tube and subsequently rolling into the outer circumferential 7 surface of the tube a profiling, preferably a thread extending over a portion or all of the length 8 thereof, while at the same time the cross-section of the tube bore is reduced, at least locally, 9 and the static mixer being fixed in its position in the longitudinal direction as a result of the reduction in cross-section.
13 Anchor tubes of this type are used as a component of injection drilling anchors, which are for 14 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 drill hole formed by means of a 16 curing grouting compound and thereby secured. The injection drilling anchor generally has for 17 this purpose at its front end a drill bit and, inside the anchor, an injection channel running 18 through it centrally in the longitudinal direction, through which the grouting compound can be 19 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 21 connected by means of couplings and which carry on their outer circumferential surface an 22 anchor thread over a portion or all of the length thereof. This improves the bonding effect with 23 the grouting compound and may also serve for connecting anchor rods to the drill bit and to one 24 another by means of couplings as well as for fastening to a rearward injection head. The injection head has a flushing head, through which for example a flushing agent (e.g. air or 26 water) is introduced during drilling and, for grouting, one or more supply components are 27 introduced under pressure into the injection channel. The preferred grouting compounds also 28 include two-component resins, the two components of which cure after a short time once they 29 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 31 shortly before, in a lost part fitted at the end of said channel. In order to achieve good mixing of 32 the components by the time they exit into the drill hole, it is known to dispose one or more so-33 called static mixers, fixed in position, in the injection channel. This is a flow obstacle, formed 34 from so-called chicanes, which, when flowed through by the two components, brings about 22635131.1 1 CA 2,713,190 Blakes Ref: 76576/00002 1 thorough mixing thereof as a result of the way in which it is configured, for example with ribs, 2 helixes etc. In order to prevent the static mixer from being carried along by the flow pressure of 3 the supply components, various techniques are used. In the prior art, it is known from DE
4 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 drilling anchors. In practice, anchor tubes of steel 6 and preferably static mixers of plastics material are generally used. The anchor tubes are often 7 produced by using a tube blank which, in the unworked initial state, still has a comparatively low 8 inner and outer surface quality and may have tolerances in terms of its dimensions and shape.
9 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 11 static mixer must have a diameter that allows it to be pushed axially into the tube bore before 12 the rolling-in of the profiling. However, on account of said tolerances in terms of dimensions 13 and size, the desired small and uniform tolerancing in the cross-section of the bore is not always 14 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.
17 Against this background, it is an object of the invention to develop a method of the type 18 mentioned at the beginning advantageously such that, in particular, the aforementioned 19 disadvantages are avoided as far as possible.
22 The set object is achieved according to the invention first and foremost in conjunction with the 23 features that, before the rolling-in of the outer profiling, a sheathing element which surrounds 24 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 26 of the static mixer results from the sheathing element being clamped and fixed to the wall of the 27 bore in the longitudinal direction by the reduction in cross-section that occurs during the rolling 28 of the profiling into the tube bore, and by it thereby also undergoing for its part a certain 29 reduction in cross-section with respect to the inner cross-section of the sheathing element, by which the static mixer is clamped in place and fixed in the longitudinal direction on the inner wall 31 of the sheathing element. Consequently, after the rolling of the profiling, the sheathing element 32 and the static mixer are both held immovably in the tube bore, so this could almost be described 33 as a two-stage process of pressing-in in the radial direction. According to the invention, the 34 sheathing element has a lower hardness and/or lower strength than the static mixer. The tubes 22635131.1 2 CA 2,713,190 Blakes Ref: 76576/00002 1 used for producing anchor tubes generally consist of steel or a comparable material, with 2 therefore a comparatively high hardness and strength. To this extent it follows, or is preferred, 3 for the material of the sheathing element also to have a lower hardness and/or a lower strength 4 in comparison with the outer 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 6 the materials of the static mixer and the anchor tube. If an anchor tube of steel and a static 7 mixer of plastics are preferably used, the anchor tube may have the highest hardness and/or 8 strength of all the components. By having a hardness that is lower in comparison with the static 9 mixer, and to this extent generally also in comparison with the anchor tube, at least on its surface, the sheathing element compensates for the tolerances described at the beginning, 11 without the static mixer undergoing any damage. Tolerances of the tube that cannot be 12 compensated by the static mixer can be compensated by the sheathing element on account of 13 its easier deformability in comparison with the static mixer. The invention consequently makes it 14 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 finished anchor tubes can be 16 improved and on the other hand costs can be saved.
18 A portion of the length of a tube or a hose may preferably be used as the sheathing element, 19 this 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 21 mixer. It is also preferred for this piece of tube or the piece of hose to have such good 22 deformability that it can, within certain limits, be easily deformed manually with respect to its 23 cross-section. In this way, insertion even into an unround tube bore, even with little freedom of 24 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.
26 To this extent, an elastically deformable hose of plastics or rubber is well suited. With regard to 27 the method according to the invention, it is also preferred that firstly the static mixer is 28 introduced into the sheathing element and then the two parts are introduced together into the 29 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 31 or somewhat smaller than the cross-section of the tube bore, in particular therefore than the 32 diameter of the tube bore before the rolling-in of the profiling. In connection with this, it is 33 preferred to use a static mixer of which the cross-section, in particular the outer diameter 34 thereof, is approximately the same size or somewhat smaller than the hollow cross-section, in 22635131.1 3 CA 2,713,190 Blakes Ref: 76576/00002 1 particular the inner diameter, of the sheathing element. Also in this case, if a sheathing element 2 with sufficiently easy deformability is used, it is possible for said sheathing element, with the 3 static mixer inserted in it, to be inserted into a tube bore which is, for example, unround in cross-4 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, tubes which have an 6 unround delimitation (for example polygonal or multi-cornered) overall, that is also on the outer 7 circumferential surface, may also be used as blanks for producing the anchor tubes. A static 8 mixer which has spiral volute portions that are adjacent to one another in the longitudinal 9 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 enveloping surface, 11 may preferably be used. In particular whenever the static mixer has angular or even sharp 12 edges at its outer peripheries, these can cut into the softer sheathing element somewhat during 13 the overrolling or rolling-in of the profile, as a result of which additional compensation for 14 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 into the tube bore while 16 leaving a free end portion of the tube bore. A subsequent method step may comprise widening 17 the end portion of the tube bore in its diameter, preferably after the rolling-in of the profiling, 18 preferably doing so by drilling it out, and subsequently finely working it on the surface. This 19 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, 21 that is to say through the already fixed static mixer. Furthermore, it is possible for at least a 22 front elongate portion of an injection connector, which has an inner hollow space, separate inlet 23 openings for various supply components to be supplied to the anchor rod and an outlet opening 24 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 26 length of the injection connector that protrudes out of the tube bore.
Such a combination of an 27 anchor rod with an injection connector forced axially into its end with frictional engagement is 28 also independently of importance within the scope of the invention, i.e.
without the other 29 features mentioned. The unit formed by the anchor rod and injection connector may be preassembled in large numbers and then supplied to an injection head for drilling-in and 31 grouting drilling injection anchors, in particular by being fed from a magazine for automated 32 operation. Depending on the desired configuration of the injection connector, it may, for 33 example, be inserted into a recess in a rotatable inner part of the flushing head, the recess 34 being geometrically matched to the rear elongate portion of the connector.
22635131.1 4 CA 2,713,190 Blakes Ref: 76576/00002 2 The invention also relates to an anchor tube for injection anchors, in the outer circumferential 3 surface of which a profiling, preferably a thread extending over a portion or all of the length 4 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 6 bore that results when the profiling is rolled in.
8 On the basis of the prior art cited at the beginning, it is an object of the invention to develop an 9 anchor tube of this type advantageously such that, in particular, the aforementioned disadvantages are avoided as far as possible.
12 The set object is achieved according to the invention first and foremost in conjunction with the 13 features that the static mixer is surrounded, at least over a portion of the length thereof, within 14 the tube bore by a sheathing element which has a lower hardness in comparison with the static mixer, and that the sheathing element and the static mixer are fixed in their position in the 16 longitudinal direction as a result of the reduction in cross-section, at least locally, that results 17 when the profiling is rolled in. It is preferably provided that the material of the sheathing element 18 has a lower hardness and/or a lower strength than the material of the static mixer, but to this 19 extent it is also adequate if there is an appropriate graduation with respect to the surfaces coming into contact. With respect to the effects and advantages that can be achieved by the 21 invention and possible developments in these respects, reference is made to the foregoing and 22 following description. In particular, it is preferred that a piece of tube or a piece of hose is 23 provided as the sheathing element. It is preferably possible for a static mixer of plastics material 24 and a sheathing element of plastics or rubber to be combined. Suitable in particular is a flexible hose of plastics that can be deformed manually in its cross-section. It is also regarded as 26 suitable if the sheathing element and the static mixer are of the same length. As far as the 27 static mixer is concerned, it is preferred that it has spiral volute portions that are adjacent to one 28 another in the longitudinal direction and are twisted with respect to one another at the 29 circumference and the preferably rib-like outer periphery of which lies at an imaginary cylindrical enveloping surface. The static mixer and the sheathing element may be disposed in the tube 31 bore, leaving an end portion undisturbed. At least a front elongate portion of an injection 32 connector, which has an inner hollow space, separate inlet openings for various supply 33 components to be supplied to the anchor rod and an outlet opening disposed at the front 34 longitudinal portion, may be forced axially into said end portion with frictional engagement. Said 22635131.1 5 CA 2,713,190 Blakes Ref: 76576/00002 1 injection connector may preferably be produced from a plastics material, more preferably from 2 polyamide, in particular in one piece as an injection molding.
The invention is further described below with reference to the accompanying figures, which 6 show a preferred exemplary embodiment and in which:
8 Figure 1 shows a longitudinal section of a tube, which by way of example is suitable for 9 producing an anchor tube according to the invention as provided by a preferred embodiment, represented in a shortened form by being broken up;
12 Figure la shows a sectional view along section line la - la in Figure 1;
14 Figure 2 shows by way of example a longitudinal section of a sheathing element, which is suitable for producing an anchor tube according to the invention as provided by a 16 first preferred embodiment, represented in a shortened form by being broken up;
18 Figure 2a shows a sectional view along section line Ha - Ha in Figure 2;
Figure 3 shows by way of example a longitudinal section, represented in a shortened form 21 by being broken up, of a static mixer, which is suitable for producing an anchor 22 tube according to the invention as provided by a preferred embodiment;
24 Figure 3a shows a sectional view along section line Ilia - Illa in Figure 3;
26 Figure 4 shows a longitudinal section, in a shortened form by being broken up, of an 27 anchor tube according to the invention as provided by a preferred embodiment 28 after the rolling-in of the sheathing element and the static mixer;
Figure 5 shows a longitudinal section of the anchor tube shown in Figure 4, simplified in a 31 schematic form;
33 Figure 6 shows the anchor tube shown in Figure 5 after further working and 22635131.1 6 CA 2,713,190 Blakes Ref: 76576/00002 1 Figure 7 shows the anchor tube shown in Figure 6 with an injection connector inserted 2 therein, according to a preferred exemplary embodiment.
The method according to the invention for producing anchor tubes 1 by a procedure preferred 6 for this purpose is described with reference to Figures 1 to 7 and the anchor tube 1 according to 7 the invention as provided by a likewise preferred embodiment and a possible development are 8 described with reference to Figures 4 to 7. Figures 1 and la show by way of example a hot-9 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 11 some other length) and, for example a diameter in the range of 30-40 mm (or some other 12 diameter). In the example chosen, it is a steel tube with a tube bore 3 running through it 13 centrally along the longitudinal direction L thereof. In the section of Figure la, it is schematically 14 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 16 extent only approximately Dl. The outer circumferential surface 4 of the tube 2 is also 17 approximately cylindrical, i.e. is subject to certain tolerances (not represented).
19 Figures 2 and 2a show a sheathing element 5, which in the example chosen is a portion of the length of a hose made of plastics material. This plastics material may preferably be 21 polyethylene (PE) or polyamide (PA), for example with a yield stress of 15-45 N/mm2. Its outer 22 diameter D2 is approximately the same or slightly smaller than the diameter D1. In the example 23 chosen, the diameter D1 of the unround tube bore is about 12-13 mm (also dependent on the 24 direction measured) and the diameter D2 is 12.5 mm, with a wall thickness of the sheathing element 5 of 1.25 mm.
27 Figure 3 shows a so-called static mixer 6 as provided by a preferred embodiment. This is 28 produced from plastics, in the specific example from polyacetal (POM), the yield stress of which 29 is in the range of about 65-75 N/mm2. 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 31 element 5. The static mixer 6, which is altogether of one piece but shown in a shortened form 32 by being broken up, has in the example an overall length of 600 mm and at the same time has 33 48 so-called chicanes 7, which lie one after the other in the longitudinal direction L. Each 34 chicane 7 is formed by two spiral volute portions 8, which are twisted in terms of their angle with 22635131.1 7 CA 2,713,190 Blakes Ref: 76576/00002 1 respect to one another by 1800 in the same elongate portion and for their part extend in each 2 case over half a revolution. Chicanes 7 that are adjacent in the longitudinal direction L have 3 respectively opposed helix pitches and are offset in their angle with respect to one another by a 4 quarter turn about the longitudinal axis, so that the structure can be flowed through in the longitudinal direction L. The rib-like outer periphery 9 of the spiral volute portions 8 has angular 6 edges, the outer peripheries 9 lying at an imaginary cylindrical enveloping surface 10 that is 7 indicated in Figures 3 and 3a by dashed lines. In the example chosen, the static mixer 6 has an 8 outer diameter 04, which like the inner diameter 03 of the sheathing element 5, is about 10 mm.
9 It goes without saying, however, that deviations from all the aforementioned dimensions, in particular diameters, and how they relate, are also possible within the scope of the invention.
11 The plastics material chosen for the sheathing element 5 has a lower hardness and easier 12 deformability than the plastics chosen for the static mixer 6.
14 For producing the anchor tube 1 according to the invention that is shown in Figures 4 and 5 in a first preferred embodiment, firstly the static mixer 6 is inserted into the sheathing element 5, 16 which in the example is of the same length, and then the two parts 5, 6, inserted one in the 17 other, are together inserted through an end opening 11 in the longitudinal direction L into the 18 tube bore 3 and pushed in therein from the end face of the tube 2 by a distance A, leaving an 19 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 D1 to Da, the 21 sheathing element 5 and the static mixer 6 can be pushed in up to this longitudinal position, also 22 shown in Figure 5, without any problem as a result of the low hardness and strength of the 23 sheathing element 5 and the chosen relative sizes described above. In a next method step, a 24 profiling 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 26 being known to the person skilled in the art. Figure 4 pictorially shows the ridges 15 and 27 grooves 16 of the anchor thread 13, which in the drawing of Figures 5 to 7 is only represented in 28 a schematically simplified form. The rolling-in of the anchor thread 14 takes place under 29 compressive loading, which leads to a certain upsetting and resultant reduction in the cross-section of the tube oriented transversely to the longitudinal direction L. The deformations 31 occurring thereby also specifically cause an at least local cross-sectional reduction of the tube 32 bore 3. Figure 5 shows, in a sectional view of a schematically simplified form, that on account 33 of the cross-sectional reduction caused by the rolling, the inner surface 17 of the tube bore 3 34 now lies face to face against the outer side of the sheathing element 5, the tolerances in terms 22635131.1 8 CA 2,713,190 Blakes Ref: 76576/00002 1 of the shape and dimensions (not represented in the drawing of Figure 5) being compensated 2 by the comparatively soft sheathing element 5 as a result of corresponding local deformations.
3 Depending on the rolling-in conditions, it is possible for a certain constriction or cross-sectional 4 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 D1 to D4 are made to match each other and 6 the rolling-in conditions and the sheathing element 5 in such a way that the narrowing of the 7 tube bore 3 also leads to a certain compression of the sheathing element
13 Anchor tubes of this type are used as a component of injection drilling anchors, which are for 14 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 drill hole formed by means of a 16 curing grouting compound and thereby secured. The injection drilling anchor generally has for 17 this purpose at its front end a drill bit and, inside the anchor, an injection channel running 18 through it centrally in the longitudinal direction, through which the grouting compound can be 19 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 21 connected by means of couplings and which carry on their outer circumferential surface an 22 anchor thread over a portion or all of the length thereof. This improves the bonding effect with 23 the grouting compound and may also serve for connecting anchor rods to the drill bit and to one 24 another by means of couplings as well as for fastening to a rearward injection head. The injection head has a flushing head, through which for example a flushing agent (e.g. air or 26 water) is introduced during drilling and, for grouting, one or more supply components are 27 introduced under pressure into the injection channel. The preferred grouting compounds also 28 include two-component resins, the two components of which cure after a short time once they 29 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 31 shortly before, in a lost part fitted at the end of said channel. In order to achieve good mixing of 32 the components by the time they exit into the drill hole, it is known to dispose one or more so-33 called static mixers, fixed in position, in the injection channel. This is a flow obstacle, formed 34 from so-called chicanes, which, when flowed through by the two components, brings about 22635131.1 1 CA 2,713,190 Blakes Ref: 76576/00002 1 thorough mixing thereof as a result of the way in which it is configured, for example with ribs, 2 helixes etc. In order to prevent the static mixer from being carried along by the flow pressure of 3 the supply components, various techniques are used. In the prior art, it is known from DE
4 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 drilling anchors. In practice, anchor tubes of steel 6 and preferably static mixers of plastics material are generally used. The anchor tubes are often 7 produced by using a tube blank which, in the unworked initial state, still has a comparatively low 8 inner and outer surface quality and may have tolerances in terms of its dimensions and shape.
9 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 11 static mixer must have a diameter that allows it to be pushed axially into the tube bore before 12 the rolling-in of the profiling. However, on account of said tolerances in terms of dimensions 13 and size, the desired small and uniform tolerancing in the cross-section of the bore is not always 14 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.
17 Against this background, it is an object of the invention to develop a method of the type 18 mentioned at the beginning advantageously such that, in particular, the aforementioned 19 disadvantages are avoided as far as possible.
22 The set object is achieved according to the invention first and foremost in conjunction with the 23 features that, before the rolling-in of the outer profiling, a sheathing element which surrounds 24 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 26 of the static mixer results from the sheathing element being clamped and fixed to the wall of the 27 bore in the longitudinal direction by the reduction in cross-section that occurs during the rolling 28 of the profiling into the tube bore, and by it thereby also undergoing for its part a certain 29 reduction in cross-section with respect to the inner cross-section of the sheathing element, by which the static mixer is clamped in place and fixed in the longitudinal direction on the inner wall 31 of the sheathing element. Consequently, after the rolling of the profiling, the sheathing element 32 and the static mixer are both held immovably in the tube bore, so this could almost be described 33 as a two-stage process of pressing-in in the radial direction. According to the invention, the 34 sheathing element has a lower hardness and/or lower strength than the static mixer. The tubes 22635131.1 2 CA 2,713,190 Blakes Ref: 76576/00002 1 used for producing anchor tubes generally consist of steel or a comparable material, with 2 therefore a comparatively high hardness and strength. To this extent it follows, or is preferred, 3 for the material of the sheathing element also to have a lower hardness and/or a lower strength 4 in comparison with the outer 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 6 the materials of the static mixer and the anchor tube. If an anchor tube of steel and a static 7 mixer of plastics are preferably used, the anchor tube may have the highest hardness and/or 8 strength of all the components. By having a hardness that is lower in comparison with the static 9 mixer, and to this extent generally also in comparison with the anchor tube, at least on its surface, the sheathing element compensates for the tolerances described at the beginning, 11 without the static mixer undergoing any damage. Tolerances of the tube that cannot be 12 compensated by the static mixer can be compensated by the sheathing element on account of 13 its easier deformability in comparison with the static mixer. The invention consequently makes it 14 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 finished anchor tubes can be 16 improved and on the other hand costs can be saved.
18 A portion of the length of a tube or a hose may preferably be used as the sheathing element, 19 this 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 21 mixer. It is also preferred for this piece of tube or the piece of hose to have such good 22 deformability that it can, within certain limits, be easily deformed manually with respect to its 23 cross-section. In this way, insertion even into an unround tube bore, even with little freedom of 24 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.
26 To this extent, an elastically deformable hose of plastics or rubber is well suited. With regard to 27 the method according to the invention, it is also preferred that firstly the static mixer is 28 introduced into the sheathing element and then the two parts are introduced together into the 29 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 31 or somewhat smaller than the cross-section of the tube bore, in particular therefore than the 32 diameter of the tube bore before the rolling-in of the profiling. In connection with this, it is 33 preferred to use a static mixer of which the cross-section, in particular the outer diameter 34 thereof, is approximately the same size or somewhat smaller than the hollow cross-section, in 22635131.1 3 CA 2,713,190 Blakes Ref: 76576/00002 1 particular the inner diameter, of the sheathing element. Also in this case, if a sheathing element 2 with sufficiently easy deformability is used, it is possible for said sheathing element, with the 3 static mixer inserted in it, to be inserted into a tube bore which is, for example, unround in cross-4 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, tubes which have an 6 unround delimitation (for example polygonal or multi-cornered) overall, that is also on the outer 7 circumferential surface, may also be used as blanks for producing the anchor tubes. A static 8 mixer which has spiral volute portions that are adjacent to one another in the longitudinal 9 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 enveloping surface, 11 may preferably be used. In particular whenever the static mixer has angular or even sharp 12 edges at its outer peripheries, these can cut into the softer sheathing element somewhat during 13 the overrolling or rolling-in of the profile, as a result of which additional compensation for 14 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 into the tube bore while 16 leaving a free end portion of the tube bore. A subsequent method step may comprise widening 17 the end portion of the tube bore in its diameter, preferably after the rolling-in of the profiling, 18 preferably doing so by drilling it out, and subsequently finely working it on the surface. This 19 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, 21 that is to say through the already fixed static mixer. Furthermore, it is possible for at least a 22 front elongate portion of an injection connector, which has an inner hollow space, separate inlet 23 openings for various supply components to be supplied to the anchor rod and an outlet opening 24 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 26 length of the injection connector that protrudes out of the tube bore.
Such a combination of an 27 anchor rod with an injection connector forced axially into its end with frictional engagement is 28 also independently of importance within the scope of the invention, i.e.
without the other 29 features mentioned. The unit formed by the anchor rod and injection connector may be preassembled in large numbers and then supplied to an injection head for drilling-in and 31 grouting drilling injection anchors, in particular by being fed from a magazine for automated 32 operation. Depending on the desired configuration of the injection connector, it may, for 33 example, be inserted into a recess in a rotatable inner part of the flushing head, the recess 34 being geometrically matched to the rear elongate portion of the connector.
22635131.1 4 CA 2,713,190 Blakes Ref: 76576/00002 2 The invention also relates to an anchor tube for injection anchors, in the outer circumferential 3 surface of which a profiling, preferably a thread extending over a portion or all of the length 4 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 6 bore that results when the profiling is rolled in.
8 On the basis of the prior art cited at the beginning, it is an object of the invention to develop an 9 anchor tube of this type advantageously such that, in particular, the aforementioned disadvantages are avoided as far as possible.
12 The set object is achieved according to the invention first and foremost in conjunction with the 13 features that the static mixer is surrounded, at least over a portion of the length thereof, within 14 the tube bore by a sheathing element which has a lower hardness in comparison with the static mixer, and that the sheathing element and the static mixer are fixed in their position in the 16 longitudinal direction as a result of the reduction in cross-section, at least locally, that results 17 when the profiling is rolled in. It is preferably provided that the material of the sheathing element 18 has a lower hardness and/or a lower strength than the material of the static mixer, but to this 19 extent it is also adequate if there is an appropriate graduation with respect to the surfaces coming into contact. With respect to the effects and advantages that can be achieved by the 21 invention and possible developments in these respects, reference is made to the foregoing and 22 following description. In particular, it is preferred that a piece of tube or a piece of hose is 23 provided as the sheathing element. It is preferably possible for a static mixer of plastics material 24 and a sheathing element of plastics or rubber to be combined. Suitable in particular is a flexible hose of plastics that can be deformed manually in its cross-section. It is also regarded as 26 suitable if the sheathing element and the static mixer are of the same length. As far as the 27 static mixer is concerned, it is preferred that it has spiral volute portions that are adjacent to one 28 another in the longitudinal direction and are twisted with respect to one another at the 29 circumference and the preferably rib-like outer periphery of which lies at an imaginary cylindrical enveloping surface. The static mixer and the sheathing element may be disposed in the tube 31 bore, leaving an end portion undisturbed. At least a front elongate portion of an injection 32 connector, which has an inner hollow space, separate inlet openings for various supply 33 components to be supplied to the anchor rod and an outlet opening disposed at the front 34 longitudinal portion, may be forced axially into said end portion with frictional engagement. Said 22635131.1 5 CA 2,713,190 Blakes Ref: 76576/00002 1 injection connector may preferably be produced from a plastics material, more preferably from 2 polyamide, in particular in one piece as an injection molding.
The invention is further described below with reference to the accompanying figures, which 6 show a preferred exemplary embodiment and in which:
8 Figure 1 shows a longitudinal section of a tube, which by way of example is suitable for 9 producing an anchor tube according to the invention as provided by a preferred embodiment, represented in a shortened form by being broken up;
12 Figure la shows a sectional view along section line la - la in Figure 1;
14 Figure 2 shows by way of example a longitudinal section of a sheathing element, which is suitable for producing an anchor tube according to the invention as provided by a 16 first preferred embodiment, represented in a shortened form by being broken up;
18 Figure 2a shows a sectional view along section line Ha - Ha in Figure 2;
Figure 3 shows by way of example a longitudinal section, represented in a shortened form 21 by being broken up, of a static mixer, which is suitable for producing an anchor 22 tube according to the invention as provided by a preferred embodiment;
24 Figure 3a shows a sectional view along section line Ilia - Illa in Figure 3;
26 Figure 4 shows a longitudinal section, in a shortened form by being broken up, of an 27 anchor tube according to the invention as provided by a preferred embodiment 28 after the rolling-in of the sheathing element and the static mixer;
Figure 5 shows a longitudinal section of the anchor tube shown in Figure 4, simplified in a 31 schematic form;
33 Figure 6 shows the anchor tube shown in Figure 5 after further working and 22635131.1 6 CA 2,713,190 Blakes Ref: 76576/00002 1 Figure 7 shows the anchor tube shown in Figure 6 with an injection connector inserted 2 therein, according to a preferred exemplary embodiment.
The method according to the invention for producing anchor tubes 1 by a procedure preferred 6 for this purpose is described with reference to Figures 1 to 7 and the anchor tube 1 according to 7 the invention as provided by a likewise preferred embodiment and a possible development are 8 described with reference to Figures 4 to 7. Figures 1 and la show by way of example a hot-9 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 11 some other length) and, for example a diameter in the range of 30-40 mm (or some other 12 diameter). In the example chosen, it is a steel tube with a tube bore 3 running through it 13 centrally along the longitudinal direction L thereof. In the section of Figure la, it is schematically 14 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 16 extent only approximately Dl. The outer circumferential surface 4 of the tube 2 is also 17 approximately cylindrical, i.e. is subject to certain tolerances (not represented).
19 Figures 2 and 2a show a sheathing element 5, which in the example chosen is a portion of the length of a hose made of plastics material. This plastics material may preferably be 21 polyethylene (PE) or polyamide (PA), for example with a yield stress of 15-45 N/mm2. Its outer 22 diameter D2 is approximately the same or slightly smaller than the diameter D1. In the example 23 chosen, the diameter D1 of the unround tube bore is about 12-13 mm (also dependent on the 24 direction measured) and the diameter D2 is 12.5 mm, with a wall thickness of the sheathing element 5 of 1.25 mm.
27 Figure 3 shows a so-called static mixer 6 as provided by a preferred embodiment. This is 28 produced from plastics, in the specific example from polyacetal (POM), the yield stress of which 29 is in the range of about 65-75 N/mm2. 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 31 element 5. The static mixer 6, which is altogether of one piece but shown in a shortened form 32 by being broken up, has in the example an overall length of 600 mm and at the same time has 33 48 so-called chicanes 7, which lie one after the other in the longitudinal direction L. Each 34 chicane 7 is formed by two spiral volute portions 8, which are twisted in terms of their angle with 22635131.1 7 CA 2,713,190 Blakes Ref: 76576/00002 1 respect to one another by 1800 in the same elongate portion and for their part extend in each 2 case over half a revolution. Chicanes 7 that are adjacent in the longitudinal direction L have 3 respectively opposed helix pitches and are offset in their angle with respect to one another by a 4 quarter turn about the longitudinal axis, so that the structure can be flowed through in the longitudinal direction L. The rib-like outer periphery 9 of the spiral volute portions 8 has angular 6 edges, the outer peripheries 9 lying at an imaginary cylindrical enveloping surface 10 that is 7 indicated in Figures 3 and 3a by dashed lines. In the example chosen, the static mixer 6 has an 8 outer diameter 04, which like the inner diameter 03 of the sheathing element 5, is about 10 mm.
9 It goes without saying, however, that deviations from all the aforementioned dimensions, in particular diameters, and how they relate, are also possible within the scope of the invention.
11 The plastics material chosen for the sheathing element 5 has a lower hardness and easier 12 deformability than the plastics chosen for the static mixer 6.
14 For producing the anchor tube 1 according to the invention that is shown in Figures 4 and 5 in a first preferred embodiment, firstly the static mixer 6 is inserted into the sheathing element 5, 16 which in the example is of the same length, and then the two parts 5, 6, inserted one in the 17 other, are together inserted through an end opening 11 in the longitudinal direction L into the 18 tube bore 3 and pushed in therein from the end face of the tube 2 by a distance A, leaving an 19 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 D1 to Da, the 21 sheathing element 5 and the static mixer 6 can be pushed in up to this longitudinal position, also 22 shown in Figure 5, without any problem as a result of the low hardness and strength of the 23 sheathing element 5 and the chosen relative sizes described above. In a next method step, a 24 profiling 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 26 being known to the person skilled in the art. Figure 4 pictorially shows the ridges 15 and 27 grooves 16 of the anchor thread 13, which in the drawing of Figures 5 to 7 is only represented in 28 a schematically simplified form. The rolling-in of the anchor thread 14 takes place under 29 compressive loading, which leads to a certain upsetting and resultant reduction in the cross-section of the tube oriented transversely to the longitudinal direction L. The deformations 31 occurring thereby also specifically cause an at least local cross-sectional reduction of the tube 32 bore 3. Figure 5 shows, in a sectional view of a schematically simplified form, that on account 33 of the cross-sectional reduction caused by the rolling, the inner surface 17 of the tube bore 3 34 now lies face to face against the outer side of the sheathing element 5, the tolerances in terms 22635131.1 8 CA 2,713,190 Blakes Ref: 76576/00002 1 of the shape and dimensions (not represented in the drawing of Figure 5) being compensated 2 by the comparatively soft sheathing element 5 as a result of corresponding local deformations.
3 Depending on the rolling-in conditions, it is possible for a certain constriction or cross-sectional 4 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 D1 to D4 are made to match each other and 6 the rolling-in conditions and the sheathing element 5 in such a way that the narrowing of the 7 tube bore 3 also leads to a certain compression of the sheathing element
5 and a reduction in 8 the hollow cross-section thereof, i.e. to a lessening of its inner diameter D3. As a result of this, 9 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 11 comparatively lower hardness of the sheathing element 5 also allows to this extent certain 12 deformations in the walls thereof, by which tolerances are compensated.
It becomes clear that 13 the sheathing element 5 is then fixed in the longitudinal direction L in the bore 3 by the clamping 14 force externally produced 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 16 therefore ultimately also fixed with respect to the tube 2 itself. If, during the rolling-in of the 17 profiling 13, there is a cross-sectional narrowing that is greater than the compression required 18 for the axial fixing of the sheathing element 5 and the static mixer 6, the sheathing element 5 19 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 sharp 21 outer periphery 9. In this way, otherwise possible damaging, or possibly even rupturing, of the 22 static mixer 6 is prevented.
24 Figure 6 shows the anchor tube 1 as provided by a further possible method step according to a preferred development of the method according to the invention. In this case, the end portion 26 12 of the tube bore 3 has been enlarged somewhat beyond the original diameter D1, in the 27 example chosen drilled out, and subsequently finely worked. At the same time, working of the 28 end face 19 has been performed, in order to make it smooth as shown.
Figure 7 shows, as a preferred further possibility, that a front elongate portion 20 of an injection 31 connector 21 has been forced into the widened end portion 12 with frictional engagement. The 32 injection connector 21 has an inner hollow space 22 with prepared separate inlet openings 23, 33 24 for various supply components to be supplied to the anchor rod 1 during grouting operation, 34 as well as an outlet opening 25, which is at the front elongate portion 20 and opens out into the 22635131.1 9 CA 2,713,190 Blakes Ref: 76576/00002 1 tube bore 3 serving as an injection channel. During the finishing, the diameter of end portion 12 2 has been matched to the outer diameter of elongate portion 20 of the injection connector 21, or 3 to the outer diameter of the axially spaced-apart annular ridges provided there, not represented 4 any more specifically in Figure 7, in such a way that a great tensile force would be required to pull the injection connector 21 out of the anchor tube 1. The rear elongate portion 26 is
It becomes clear that 13 the sheathing element 5 is then fixed in the longitudinal direction L in the bore 3 by the clamping 14 force externally produced 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 16 therefore ultimately also fixed with respect to the tube 2 itself. If, during the rolling-in of the 17 profiling 13, there is a cross-sectional narrowing that is greater than the compression required 18 for the axial fixing of the sheathing element 5 and the static mixer 6, the sheathing element 5 19 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 sharp 21 outer periphery 9. In this way, otherwise possible damaging, or possibly even rupturing, of the 22 static mixer 6 is prevented.
24 Figure 6 shows the anchor tube 1 as provided by a further possible method step according to a preferred development of the method according to the invention. In this case, the end portion 26 12 of the tube bore 3 has been enlarged somewhat beyond the original diameter D1, in the 27 example chosen drilled out, and subsequently finely worked. At the same time, working of the 28 end face 19 has been performed, in order to make it smooth as shown.
Figure 7 shows, as a preferred further possibility, that a front elongate portion 20 of an injection 31 connector 21 has been forced into the widened end portion 12 with frictional engagement. The 32 injection connector 21 has an inner hollow space 22 with prepared separate inlet openings 23, 33 24 for various supply components to be supplied to the anchor rod 1 during grouting operation, 34 as well as an outlet opening 25, which is at the front elongate portion 20 and opens out into the 22635131.1 9 CA 2,713,190 Blakes Ref: 76576/00002 1 tube bore 3 serving as an injection channel. During the finishing, the diameter of end portion 12 2 has been matched to the outer diameter of elongate portion 20 of the injection connector 21, or 3 to the outer diameter of the axially spaced-apart annular ridges provided there, not represented 4 any more specifically in Figure 7, in such a way that a great tensile force would be required to pull the injection connector 21 out of the anchor tube 1. The rear elongate portion 26 is
6 intended for the purpose of entering a recess geometrically matched to it on an injection head
7 for supplying the supply components (for example the two components of a two-component
8 resin) on a rotationally driven inner part, so that the prepared inlet openings 23, 24 are in line
9 with outlet openings 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 11 threaded bore in the rotationally driven inner part of the flushing head. A further special feature 12 of the injection connector 21 is that, before it is used for the first time, its inlet openings 23, 24 13 are still closed by predetermined breaking points in the form of reductions in the wall thickness.
14 These only tear when they are subjected to pressure by a flushing agent or by the components of the grouting compound used, the adjacent, cross-sectionally wedge-shaped wall regions 16 acting as resilient valve flaps. A separate further static mixer 28 is fitted into the front portion of 17 hollow space 22 that is axially delimited by an annular shoulder 27.
This static mixer does not 18 require any further fixing, thus also does not require, in particular, any clamping connection to 19 the injection connector 21. Instead, its rearward axial movement is limited by the annular shoulder 27 and its forward axial movement is limited by the separate static mixer 6, which is 21 fixed in its position in relation to the anchor tube 1 in the way described above.
23 The scope of the claims appended hereto should not be limited by the preferred embodiments 24 set forth in the present description, but should be given the broadest interpretation consistent with the description as a whole.
=
22635131.1 10
A torque-transmitting connection of the anchor rod 1 is possible by screwing its anchor thread 13 into a matching 11 threaded bore in the rotationally driven inner part of the flushing head. A further special feature 12 of the injection connector 21 is that, before it is used for the first time, its inlet openings 23, 24 13 are still closed by predetermined breaking points in the form of reductions in the wall thickness.
14 These only tear when they are subjected to pressure by a flushing agent or by the components of the grouting compound used, the adjacent, cross-sectionally wedge-shaped wall regions 16 acting as resilient valve flaps. A separate further static mixer 28 is fitted into the front portion of 17 hollow space 22 that is axially delimited by an annular shoulder 27.
This static mixer does not 18 require any further fixing, thus also does not require, in particular, any clamping connection to 19 the injection connector 21. Instead, its rearward axial movement is limited by the annular shoulder 27 and its forward axial movement is limited by the separate static mixer 6, which is 21 fixed in its position in relation to the anchor tube 1 in the way described above.
23 The scope of the claims appended hereto should not be limited by the preferred embodiments 24 set forth in the present description, but should be given the broadest interpretation consistent with the description as a whole.
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22635131.1 10
Claims (15)
1. A method for producing anchor tubes for injection anchors with a static mixer fixed in its position in the longitudinal direction, starting with a tube 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 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, characterized in that, before the rolling-in of the profiling (13), a sheathing element (5) which surrounds the static mixer (6) in the tube bore (3), at least over a portion of the length thereof, and has a lower hardness in comparison with the static mixer (6), is introduced into the tube bore (3).
2. The method according to claim 1, characterized in that a piece of tube or a piece of hose is used as the sheathing element (5).
3. The method according to claim 1 or 2, characterized in that firstly the static mixer (6) is introduced into the sheathing element (5) and then the two parts are introduced together into the tube bore (3).
4. The method according to any one of claims 1 to 3, characterized by using a sheathing element (5) of which the outer cross-section, in particular the outer diameter thereof, is approximately the same size or somewhat smaller than the cross-section of the tube bore, in particular the diameter of the tube bore before the rolling-in of the profiling (13).
5. The method according to any one of claims 1 to 4, characterized by using a static mixer (6) of which the cross-section, in particular the outer diameter thereof, is approximately the same size or somewhat smaller than the hollow cross-section, in particular the inner diameter, of the sheathing element (5).
6. The method according to any one of claims 1 to 5, characterized by using a static mixer (6) which has spiral volute portions (8) that are adjacent to one another in the longitudinal direction (L) and are twisted with respect to one another at the circumference and the, in particular rib-like, outer periphery (9) of which lies at an imaginary cylindrical enveloping surface (10).
7. The method according to any one of claims 1 to 6, characterized in that the static mixer (6) and the sheathing element (5) are introduced into the tube bore (3) while leaving a free end portion (12) of the tube bore (3).
8. The method according to any one of claims 1 o 7, characterized in that the end portion (12) of the tube bore (3) is widened in its diameter, particularly after the rolling-in of the profiling (13), in particular is drilled out, and subsequently finely worked on the surface.
9. The method according to any one of claims 1 to 8, characterized in that at least a front elongate portion (20) of an injection connector (21), which has an inner hollow space (22), separate inlet openings (23, 24) for various supply components to be supplied to the anchor rod (1) and an outlet opening (25) disposed at the front longitudinal portion (20), is forced axially into the widened end portion (12) with frictional engagement.
10. An 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, characterized in that the static mixer (6) is surrounded, at least over a portion of the length thereof, within the tube bore (3) by a sheathing element (5), in that the sheathing element has a lower hardness in comparison with the static mixer (6), and in that the sheathing element (5) and the static mixer (6) are fixed in their position in the longitudinal direction (L) as a result of the reduction in cross-section, at least locally, that results when the profiling (13) is rolled in.
11. The anchor tube according to claim 10 or in particular according thereto, characterized in that a piece of tube or a piece of hose is provided as the sheathing element (5).
12. The anchor tube according to claim 10 or 11, characterized in that a static mixer (6) of plastics material and a sheathing element (5) of plastics or rubber is provided.
13. The anchor tube according to any one of claims 10 to 12, characterized in that the static mixer (6) has spiral volute portions (8) that are adjacent to one another in the longitudinal direction (L and are twisted with respect to one another at the circumference and the, in particular rib-like, outer periphery (9) of which lies at an imaginary cylindrical enveloping surface (10).
14. The anchor tube according to any one of claims 10 to 13, characterized in that the static mixer (6) and the sheathing element (5) are disposed in the tube bore (3), leaving an end portion (12) of the tube bore (3) undisturbed.
15. The anchor tube according to any one of claims 10 to 14, characterized in that at least a front elongate portion (20) of an injection connector (21), which has an inner hollow space (22), separate inlet openings (23, 24) for various supply components to be supplied to the anchor rod (1) and an outlet opening (25) disposed at the front longitudinal portion (20), is forced axially into the end portion (12) with frictional engagement.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008006235.9 | 2008-01-25 | ||
| DE102008006235A DE102008006235A1 (en) | 2008-01-25 | 2008-01-25 | Anchor pipe and method for its production |
| PCT/EP2009/050156 WO2009092630A1 (en) | 2008-01-25 | 2009-01-08 | Anchor tube and method for production thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2713190A1 CA2713190A1 (en) | 2009-07-30 |
| CA2713190C true CA2713190C (en) | 2015-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2713190A Expired - Fee Related CA2713190C (en) | 2008-01-25 | 2009-01-08 | Anchor tube and method for production thereof |
Country Status (8)
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|---|---|
| EP (1) | EP2238313B1 (en) |
| CN (1) | CN101925721B (en) |
| AT (1) | ATE533919T1 (en) |
| AU (1) | AU2009207825C1 (en) |
| CA (1) | CA2713190C (en) |
| DE (1) | DE102008006235A1 (en) |
| WO (1) | WO2009092630A1 (en) |
| ZA (1) | ZA201004186B (en) |
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| CN102094662B (en) * | 2011-03-15 | 2013-04-03 | 北京科技大学 | Friction sleeve type large deformation anchor rod |
| CN103867219B (en) * | 2014-03-25 | 2015-08-05 | 中国石油大学(华东) | A kind of Apparatus and method for expanding the pea gravel concreten anchoring support soil body for whirlpool extrusion |
| CN108797368A (en) * | 2018-08-27 | 2018-11-13 | 中国冶集团有限公司 | The fast aligning method of steel case arch bridge anchor tube |
| KR20230026138A (en) | 2021-08-17 | 2023-02-24 | 삼성전자주식회사 | Communication device for performing DPSK based on a plurality of previous signals and operating method thereof |
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| GB2241761B (en) * | 1990-03-08 | 1993-11-24 | Apex Fuels Ltd | Reinforcement of ground strata and foundation fixing |
| CN2065667U (en) * | 1990-05-16 | 1990-11-14 | 山东矿业学院 | Grouting anchoring-bolt and return-stop valve |
| CN2220530Y (en) * | 1994-10-07 | 1996-02-21 | 安徽省疏浚工程总公司 | Anchor rock mud filling machine |
| CN2406064Y (en) * | 1999-09-27 | 2000-11-15 | 李云义 | Anchor rod |
| DE10321175B3 (en) * | 2003-05-12 | 2004-08-26 | Carbotech Fosroc Gmbh | Injection ground anchor, to stabilize walls in mining and tunneling, has an inner channel with at least one chamber to hold the mixed cement to be pressed out into the borehole |
| CN100513745C (en) * | 2005-11-11 | 2009-07-15 | 中国京冶工程技术有限公司 | Construction method for mechanical hole reaming of anchor rod |
| DE102007005540B4 (en) | 2006-02-24 | 2015-04-23 | Friedr. Ischebeck Gmbh | Method and injection anchor with fixed static mixer |
| CN200943205Y (en) * | 2006-07-03 | 2007-09-05 | 于艳芳 | Anchor bar assembly for earth anchor bar construction |
-
2008
- 2008-01-25 DE DE102008006235A patent/DE102008006235A1/en not_active Withdrawn
-
2009
- 2009-01-08 AU AU2009207825A patent/AU2009207825C1/en not_active Ceased
- 2009-01-08 CA CA2713190A patent/CA2713190C/en not_active Expired - Fee Related
- 2009-01-08 AT AT09703346T patent/ATE533919T1/en active
- 2009-01-08 WO PCT/EP2009/050156 patent/WO2009092630A1/en active Application Filing
- 2009-01-08 CN CN200980103103.8A patent/CN101925721B/en not_active Expired - Fee Related
- 2009-01-08 EP EP09703346A patent/EP2238313B1/en not_active Not-in-force
-
2010
- 2010-06-11 ZA ZA2010/04186A patent/ZA201004186B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP2238313B1 (en) | 2011-11-16 |
| CN101925721B (en) | 2013-03-13 |
| WO2009092630A1 (en) | 2009-07-30 |
| AU2009207825C1 (en) | 2014-06-26 |
| ATE533919T1 (en) | 2011-12-15 |
| CA2713190A1 (en) | 2009-07-30 |
| EP2238313A1 (en) | 2010-10-13 |
| AU2009207825A1 (en) | 2009-07-30 |
| CN101925721A (en) | 2010-12-22 |
| DE102008006235A1 (en) | 2009-07-30 |
| AU2009207825B2 (en) | 2014-06-05 |
| ZA201004186B (en) | 2011-08-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20131127 |
|
| MKLA | Lapsed |
Effective date: 20210108 |