CA2713190A1 - Anchor tube and method for production thereof - Google Patents
Anchor tube and method for production thereof Download PDFInfo
- Publication number
- CA2713190A1 CA2713190A1 CA2713190A CA2713190A CA2713190A1 CA 2713190 A1 CA2713190 A1 CA 2713190A1 CA 2713190 A CA2713190 A CA 2713190A CA 2713190 A CA2713190 A CA 2713190A CA 2713190 A1 CA2713190 A1 CA 2713190A1
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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.)
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- 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
- 239000003795 chemical substances by application Substances 0.000 description 12
- 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
- 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
Agent Ref: 76576/00002 1 Anchor Tube and Method for Production Thereof
2
3 The present invention relates in first instance to a method for producing anchor tubes for
4 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 6 surface of the tube a profiling, preferably a thread extending over a portion or all of the length 7 thereof, while at the same time the cross-section of the tube bore is elongated, at least locally, 8 and the static mixer being fixed in its position in the longitudinal direction as a result of the 9 reduction in cross-section.
11 Anchor tubes of this type are used as a component of injection drilling anchors, which are for 12 example drilled into a rock face for securement, into the face of a void in an opencast 13 excavation, into a bedrock or the like and are grouted in the drill hole formed by means of a 14 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 16 through it centrally in the longitudinal direction, through which the grouting compound can be 17 supplied and which has, at its front end outlet, openings opening out to the outside of the 18 anchor. Such an injection anchor may have one, or more if need be, anchor tubes which are 19 connected by means of couplings and which carry on their outer circumferential surface an anchor thread over a portion or all of the length thereof. This improves the bonding effect with 21 the grouting compound and may also serve for connecting anchor rods to the drill bit and to one 22 another by means of couplings as well as for fastening to a rearward injection head. The 23 injection head has a flushing head, through which for example a flushing agent (e.g. air or 24 water) is introduced during drilling and, for grouting, one or more supply components are introduced under pressure into the injection channel. The preferred grouting compounds also 26 include two-component resins, the two components of which cure after a short time once they 27 come into contact with each other. Such supply components are therefore supplied to the 28 injection head separately, so that they only come together after entering the injection channel or 29 shortly before, in a 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-31 called static mixers, fixed in position, in the injection channel. This is a flow obstacle, formed 32 from so-called chicanes, which, when flowed through by the two components, brings about 33 thorough mixing thereof as a result of the way in which it is configured, for example with ribs, 34 helixes etc. In order to prevent the static mixer from being carried along by the flow pressure of 22015948.1 1 Agent Ref: 76576/00002 1 the supply components, various techniques are used. In the prior art, it is known from DE
2 102007005540 Al for static mixers to be rolled into the tube bore that runs centrally through as 3 a supply channel in anchor tubes of injection drilling anchors. In practice, anchor tubes of steel 4 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 6 inner and outer surface quality and may have tolerances in terms of its dimensions and shape.
7 In particular, the tube blank sometimes even has an unround cross-section of the bore and/or 8 outer cross-section, for example a polygonal or even multi-cornered cross-section. The desired 9 static 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 11 and size, the desired small and uniform tolerancing in the cross-section of the bore is not always 12 achieved, so that the static mixers cannot always be rolled into the bore of all injection anchors 13 in the known manner, and there is the risk of the static mixers becoming damaged.
Against this background, it is an object of the invention to develop a method of the type 16 mentioned at the beginning advantageously such that, in particular, the aforementioned 17 disadvantages are avoided as far as possible.
19 The set object is achieved according to the invention first and foremost in conjunction with the features that, before the rolling-in of the outer profiling, a sheathing element which surrounds 21 the static mixer in the tube bore, at least over a portion of the length thereof, and has a lower 22 hardness in comparison with the static mixer, is introduced into the tube bore. The axial fixing 23 of the static mixer results from the sheathing element being clamped and fixed to the wall of the 24 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 26 reduction in cross-section with respect to the inner cross-section of the sheathing element, by 27 which the static mixer is clamped in place and fixed in the longitudinal direction on the inner wall 28 of the sheathing element. Consequently, after the rolling of the profiling, the sheathing element 29 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 31 sheathing element has a lower hardness and/or lower strength than the static mixer. The tubes 32 used for producing anchor tubes generally consist of steel or a comparable material, with 33 therefore a comparatively high hardness and strength. To this extent it follows, or is preferred, 34 for the material of the sheathing element also to have a lower hardness and/or a lower strength 22015948.1 2 Agent Ref: 76576/00002 1 in comparison with the outer anchor tube. It is preferred to this extent for the material of the 2 sheathing element to have the lowest hardness and/or the lowest strength in comparison with 3 the materials of the static mixer and the anchor tube. If an anchor tube of steel and a static 4 mixer of 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 6 mixer, and to this extent generally also in comparison with the anchor tube, at least on its 7 surface, the sheathing element compensates for the tolerances described at the beginning, 8 without the static mixer undergoing any damage. Tolerances of the tube that cannot be 9 compensated by the static mixer can be compensated by the sheathing element on account of its easier deformability in comparison with the static mixer. The invention consequently makes it 11 possible that static mixers can also be rolled into blanks or anchor tubes with comparatively 12 greater tolerances, so that on the one hand the quality of the finished anchor tubes can be 13 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, 16 this portion preferably being of the same length as the static mixer, but it may also be of a 17 different length. To this extent, the sheathing element is a part that is separate from the static 18 mixer. It is also preferred for this piece of tube or the piece of hose to have such good 19 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 21 movement, and compensation for even relatively great tolerances is made easier. For this 22 purpose, the sheathing element may preferably have a comparatively low modulus of elasticity.
23 To this extent, an elastically deformable hose of plastics or rubber is well suited. With regard to 24 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 26 bore of the blank or into the tube bore. It is regarded as suitable that the outer cross-section of 27 the sheathing element, in particular the outer diameter thereof, is approximately the same size 28 or somewhat smaller than the cross-section of the tube bore, in particular therefore than the 29 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 31 thereof, is approximately the same size or somewhat smaller than the hollow cross-section, in 32 particular the inner diameter, of the sheathing element. Also in this case, if a sheathing element 33 with sufficiently easy deformability is used, it is possible for said sheathing element, with the 34 static mixer inserted in it, to be inserted into a tube bore which is, for example, unround in cross-22015948.1 3 Agent Ref: 76576/00002 1 section (for example polygonal or multi-cornered) before the rolling-in of the profiling and which 2 is possibly also uneven in the longitudinal direction. To this extent, tubes which have an 3 unround delimitation (for example polygonal or multi-cornered) overall, that is also on the outer 4 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 one another in the longitudinal 6 direction of the mixer and are twisted with respect to one another at the circumference and the 7 preferably rib-like outer periphery of which lies at an imaginary cylindrical enveloping surface, 8 may preferably be used. In particular whenever the static mixer has angular or even sharp 9 edges at its outer peripheries, these can cut into the softer sheathing element somewhat during the overrolling or rolling-in of the profile, as a result of which additional compensation for 11 tolerances and improved axial fixing are made possible. A suitable development of the method 12 provides that the static mixer and the sheathing element are introduced into the tube bore while 13 leaving a free end portion of the tube bore. A subsequent method step may comprise widening 14 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 subsequently finely working it on the surface. This 16 working may take place in particular in a separate end working station, it being possible for the 17 swarf that is formed during the working of the end portion to be blown out from the other side, 18 that is to say through the already fixed static mixer. Furthermore, it is possible for at least a 19 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 21 disposed at the front longitudinal portion, to be forced axially into the widened end portion with 22 frictional engagement. If need be, a protective cap may be fitted onto the rear end along the 23 length of the injection connector that protrudes out of the tube bore. Such a combination of an 24 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 26 features mentioned. The unit formed by the anchor rod and injection connector may be 27 preassembled in large numbers and then supplied to an injection head for drilling-in and 28 grouting drilling injection anchors, in particular by being fed from a magazine for automated 29 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 31 being geometrically matched to the rear elongate portion of the connector.
33 The invention also relates to an anchor tube for injection anchors, in the outer circumferential 34 surface of which a profiling, preferably a thread extending over a portion or all of the length 22015948.1 4 Agent Ref: 76576/00002 1 thereof, is rolled in and in the tube bore of which a static mixer is fixed in its position in the 2 longitudinal direction as a result of the reduction in cross-section, at least locally, of the tube 3 bore that results when the profiling is rolled in.
On the basis of the prior art cited at the beginning, it is an object of the invention to develop an 6 anchor tube of this type advantageously such that, in particular, the aforementioned 7 disadvantages are avoided as far as possible.
9 The set object is achieved according to the invention first and foremost in conjunction with the features that the static mixer is surrounded, at least over a portion of the length thereof, within 11 the tube bore by a sheathing element which has a lower hardness in comparison with the static 12 mixer, and that the sheathing element and the static mixer are fixed in their position in the 13 longitudinal direction as a result of the reduction in cross-section, at least locally, that results 14 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 16 extent it is also adequate if there is an appropriate graduation with respect to the surfaces 17 coming into contact. With respect to the effects and advantages that can be achieved by the 18 invention and possible developments in these respects, reference is made to the foregoing and 19 following description. In 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 21 and a sheathing element of plastics or rubber to be combined. Suitable in particular is a flexible 22 hose of plastics that can be deformed manually in its cross-section. It is also regarded as 23 suitable if the sheathing element and the static mixer are of the same length. As far as the 24 static mixer is concerned, it is preferred that it has spiral volute portions that are adjacent to one another in the longitudinal direction and are twisted with respect to one another at the 26 circumference and the preferably rib-like outer periphery of which lies at an imaginary cylindrical 27 enveloping surface. The static mixer and the sheathing element may be disposed in the tube 28 bore, leaving an end portion undisturbed. At least a front elongate portion of an injection 29 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 31 longitudinal portion, may be forced axially into said end portion with frictional engagement. Said 32 injection connector may preferably be produced from a plastics material, more preferably from 33 polyamide, in particular in one piece as an injection molding.
22015948.1 5 Agent Ref: 76576/00002 1 The invention is further described below with reference to the accompanying figures, which 2 show a preferred exemplary embodiment and in which:
4 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 provided by a preferred 6 embodiment, represented in a shortened form by being broken up;
8 Figure 1a shows a sectional view along section line la - la in Figure 1;
Figure 2 shows by way of example a longitudinal section of a sheathing element, which is 11 suitable for producing an anchor tube according to the invention as provided by a 12 first preferred embodiment, represented in a shortened form by being broken up;
14 Figure 2a shows a sectional view along section line Ila - Ila in Figure 2;
16 Figure 3 shows by way of example a longitudinal section, represented in a shortened form 17 by being broken up, of a static mixer, which is suitable for producing an anchor 18 tube according to the invention as provided by a preferred embodiment;
Figure 3a shows a sectional view along section line Illa - Illa in Figure 3;
22 Figure 4 shows a longitudinal section, in a shortened form by being broken up, of an 23 anchor tube according to the invention as provided by a preferred embodiment 24 after the rolling-in of the sheathing element and the static mixer;
26 Figure 5 shows a longitudinal section of the anchor tube shown in Figure 4, simplified in a 27 schematic form;
29 Figure 6 shows the anchor tube shown in Figure 5 after further working and 31 Figure 7 shows the anchor tube shown in Figure 6 with an injection connector inserted 32 therein, according to a preferred exemplary embodiment.
22015948.1 6 Agent Ref: 76576/00002 1 The method according to the invention for producing anchor tubes 1 by a procedure preferred 2 for this purpose is described with reference to Figures 1 to 7 and the anchor tube 1 according to 3 the invention as provided by a likewise preferred embodiment and a possible development are 4 described with reference to Figures 4 to 7. Figures 1 and 1 a 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 6 tube and may have, for example, an overall length (shown in a shortened form) of 2.5 m (or 7 some other length) and, for example a diameter in the range of 30-40 mm (or some other 8 diameter). In the example chosen, it is a steel tube with a tube bore 3 running through it 9 centrally along the longitudinal direction L thereof. In the section of Figure 1a, it is schematically shown that the tube bore 3 has a cross-section which, though round, deviates from an exact 11 circular shape by schematically indicated tolerances, the diameter of which, therefore, is to this 12 extent only approximately D1. The outer circumferential surface 4 of the tube 2 is also 13 approximately cylindrical, i.e. is subject to certain tolerances (not represented).
Figures 2 and 2a show a sheathing element 5, which in the example chosen is a portion of the 16 length of a hose made of plastics material. This plastics material may preferably be 17 polyethylene (PE) or polyamide (PA), for example with a yield stress of 15-45 N/mm2. Its outer 18 diameter D2 is approximately the same or slightly smaller than the diameter D1. In the example 19 chosen, the diameter D1 of the unround tube bore is about 12-13 mm (also dependent on the direction measured) and the diameter D2 is 12.5 mm, with a wall thickness of the sheathing 21 element 5 of 1.25 mm.
23 Figure 3 shows a so-called static mixer 6 as provided by a preferred embodiment. This is 24 produced from plastics, in the specific example from polyacetal (POM), the yield stress of which is in the range of about 65-75 N/mm2. In the example, the material of the static mixer 6 26 consequently has a higher strength than the material of the plastics hose of the sheathing 27 element 5. The static mixer 6, which is altogether of one piece but shown in a shortened form 28 by being broken up, has in the example an overall length of 600 mm and at the same time has 29 48 so-called chicanes 7, which lie one after the other in the longitudinal direction L. Each chicane 7 is formed by two spiral volute portions 8, which are twisted in terms of their angle with 31 respect to one another by 180 in the same elongate portion and for their part extend in each 32 case over half a revolution. Chicanes 7 that are adjacent in the longitudinal direction L have 33 respectively opposed helix pitches and are offset in their angle with respect to one another by a 34 quarter turn about the longitudinal axis, so that the structure can be flowed through in the 22015948.1 7 Agent Ref: 76576/00002 1 longitudinal direction L. The rib-like outer periphery 9 of the spiral volute portions 8 has angular 2 edges, the outer peripheries 9 lying at an imaginary cylindrical enveloping surface 10 that is 3 indicated in Figures 3 and 3a by dashed lines. In the example chosen, the static mixer 6 has an 4 outer diameter D4, which like the inner diameter D3 of the sheathing element
11 Anchor tubes of this type are used as a component of injection drilling anchors, which are for 12 example drilled into a rock face for securement, into the face of a void in an opencast 13 excavation, into a bedrock or the like and are grouted in the drill hole formed by means of a 14 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 16 through it centrally in the longitudinal direction, through which the grouting compound can be 17 supplied and which has, at its front end outlet, openings opening out to the outside of the 18 anchor. Such an injection anchor may have one, or more if need be, anchor tubes which are 19 connected by means of couplings and which carry on their outer circumferential surface an anchor thread over a portion or all of the length thereof. This improves the bonding effect with 21 the grouting compound and may also serve for connecting anchor rods to the drill bit and to one 22 another by means of couplings as well as for fastening to a rearward injection head. The 23 injection head has a flushing head, through which for example a flushing agent (e.g. air or 24 water) is introduced during drilling and, for grouting, one or more supply components are introduced under pressure into the injection channel. The preferred grouting compounds also 26 include two-component resins, the two components of which cure after a short time once they 27 come into contact with each other. Such supply components are therefore supplied to the 28 injection head separately, so that they only come together after entering the injection channel or 29 shortly before, in a 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-31 called static mixers, fixed in position, in the injection channel. This is a flow obstacle, formed 32 from so-called chicanes, which, when flowed through by the two components, brings about 33 thorough mixing thereof as a result of the way in which it is configured, for example with ribs, 34 helixes etc. In order to prevent the static mixer from being carried along by the flow pressure of 22015948.1 1 Agent Ref: 76576/00002 1 the supply components, various techniques are used. In the prior art, it is known from DE
2 102007005540 Al for static mixers to be rolled into the tube bore that runs centrally through as 3 a supply channel in anchor tubes of injection drilling anchors. In practice, anchor tubes of steel 4 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 6 inner and outer surface quality and may have tolerances in terms of its dimensions and shape.
7 In particular, the tube blank sometimes even has an unround cross-section of the bore and/or 8 outer cross-section, for example a polygonal or even multi-cornered cross-section. The desired 9 static 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 11 and size, the desired small and uniform tolerancing in the cross-section of the bore is not always 12 achieved, so that the static mixers cannot always be rolled into the bore of all injection anchors 13 in the known manner, and there is the risk of the static mixers becoming damaged.
Against this background, it is an object of the invention to develop a method of the type 16 mentioned at the beginning advantageously such that, in particular, the aforementioned 17 disadvantages are avoided as far as possible.
19 The set object is achieved according to the invention first and foremost in conjunction with the features that, before the rolling-in of the outer profiling, a sheathing element which surrounds 21 the static mixer in the tube bore, at least over a portion of the length thereof, and has a lower 22 hardness in comparison with the static mixer, is introduced into the tube bore. The axial fixing 23 of the static mixer results from the sheathing element being clamped and fixed to the wall of the 24 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 26 reduction in cross-section with respect to the inner cross-section of the sheathing element, by 27 which the static mixer is clamped in place and fixed in the longitudinal direction on the inner wall 28 of the sheathing element. Consequently, after the rolling of the profiling, the sheathing element 29 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 31 sheathing element has a lower hardness and/or lower strength than the static mixer. The tubes 32 used for producing anchor tubes generally consist of steel or a comparable material, with 33 therefore a comparatively high hardness and strength. To this extent it follows, or is preferred, 34 for the material of the sheathing element also to have a lower hardness and/or a lower strength 22015948.1 2 Agent Ref: 76576/00002 1 in comparison with the outer anchor tube. It is preferred to this extent for the material of the 2 sheathing element to have the lowest hardness and/or the lowest strength in comparison with 3 the materials of the static mixer and the anchor tube. If an anchor tube of steel and a static 4 mixer of 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 6 mixer, and to this extent generally also in comparison with the anchor tube, at least on its 7 surface, the sheathing element compensates for the tolerances described at the beginning, 8 without the static mixer undergoing any damage. Tolerances of the tube that cannot be 9 compensated by the static mixer can be compensated by the sheathing element on account of its easier deformability in comparison with the static mixer. The invention consequently makes it 11 possible that static mixers can also be rolled into blanks or anchor tubes with comparatively 12 greater tolerances, so that on the one hand the quality of the finished anchor tubes can be 13 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, 16 this portion preferably being of the same length as the static mixer, but it may also be of a 17 different length. To this extent, the sheathing element is a part that is separate from the static 18 mixer. It is also preferred for this piece of tube or the piece of hose to have such good 19 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 21 movement, and compensation for even relatively great tolerances is made easier. For this 22 purpose, the sheathing element may preferably have a comparatively low modulus of elasticity.
23 To this extent, an elastically deformable hose of plastics or rubber is well suited. With regard to 24 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 26 bore of the blank or into the tube bore. It is regarded as suitable that the outer cross-section of 27 the sheathing element, in particular the outer diameter thereof, is approximately the same size 28 or somewhat smaller than the cross-section of the tube bore, in particular therefore than the 29 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 31 thereof, is approximately the same size or somewhat smaller than the hollow cross-section, in 32 particular the inner diameter, of the sheathing element. Also in this case, if a sheathing element 33 with sufficiently easy deformability is used, it is possible for said sheathing element, with the 34 static mixer inserted in it, to be inserted into a tube bore which is, for example, unround in cross-22015948.1 3 Agent Ref: 76576/00002 1 section (for example polygonal or multi-cornered) before the rolling-in of the profiling and which 2 is possibly also uneven in the longitudinal direction. To this extent, tubes which have an 3 unround delimitation (for example polygonal or multi-cornered) overall, that is also on the outer 4 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 one another in the longitudinal 6 direction of the mixer and are twisted with respect to one another at the circumference and the 7 preferably rib-like outer periphery of which lies at an imaginary cylindrical enveloping surface, 8 may preferably be used. In particular whenever the static mixer has angular or even sharp 9 edges at its outer peripheries, these can cut into the softer sheathing element somewhat during the overrolling or rolling-in of the profile, as a result of which additional compensation for 11 tolerances and improved axial fixing are made possible. A suitable development of the method 12 provides that the static mixer and the sheathing element are introduced into the tube bore while 13 leaving a free end portion of the tube bore. A subsequent method step may comprise widening 14 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 subsequently finely working it on the surface. This 16 working may take place in particular in a separate end working station, it being possible for the 17 swarf that is formed during the working of the end portion to be blown out from the other side, 18 that is to say through the already fixed static mixer. Furthermore, it is possible for at least a 19 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 21 disposed at the front longitudinal portion, to be forced axially into the widened end portion with 22 frictional engagement. If need be, a protective cap may be fitted onto the rear end along the 23 length of the injection connector that protrudes out of the tube bore. Such a combination of an 24 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 26 features mentioned. The unit formed by the anchor rod and injection connector may be 27 preassembled in large numbers and then supplied to an injection head for drilling-in and 28 grouting drilling injection anchors, in particular by being fed from a magazine for automated 29 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 31 being geometrically matched to the rear elongate portion of the connector.
33 The invention also relates to an anchor tube for injection anchors, in the outer circumferential 34 surface of which a profiling, preferably a thread extending over a portion or all of the length 22015948.1 4 Agent Ref: 76576/00002 1 thereof, is rolled in and in the tube bore of which a static mixer is fixed in its position in the 2 longitudinal direction as a result of the reduction in cross-section, at least locally, of the tube 3 bore that results when the profiling is rolled in.
On the basis of the prior art cited at the beginning, it is an object of the invention to develop an 6 anchor tube of this type advantageously such that, in particular, the aforementioned 7 disadvantages are avoided as far as possible.
9 The set object is achieved according to the invention first and foremost in conjunction with the features that the static mixer is surrounded, at least over a portion of the length thereof, within 11 the tube bore by a sheathing element which has a lower hardness in comparison with the static 12 mixer, and that the sheathing element and the static mixer are fixed in their position in the 13 longitudinal direction as a result of the reduction in cross-section, at least locally, that results 14 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 16 extent it is also adequate if there is an appropriate graduation with respect to the surfaces 17 coming into contact. With respect to the effects and advantages that can be achieved by the 18 invention and possible developments in these respects, reference is made to the foregoing and 19 following description. In 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 21 and a sheathing element of plastics or rubber to be combined. Suitable in particular is a flexible 22 hose of plastics that can be deformed manually in its cross-section. It is also regarded as 23 suitable if the sheathing element and the static mixer are of the same length. As far as the 24 static mixer is concerned, it is preferred that it has spiral volute portions that are adjacent to one another in the longitudinal direction and are twisted with respect to one another at the 26 circumference and the preferably rib-like outer periphery of which lies at an imaginary cylindrical 27 enveloping surface. The static mixer and the sheathing element may be disposed in the tube 28 bore, leaving an end portion undisturbed. At least a front elongate portion of an injection 29 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 31 longitudinal portion, may be forced axially into said end portion with frictional engagement. Said 32 injection connector may preferably be produced from a plastics material, more preferably from 33 polyamide, in particular in one piece as an injection molding.
22015948.1 5 Agent Ref: 76576/00002 1 The invention is further described below with reference to the accompanying figures, which 2 show a preferred exemplary embodiment and in which:
4 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 provided by a preferred 6 embodiment, represented in a shortened form by being broken up;
8 Figure 1a shows a sectional view along section line la - la in Figure 1;
Figure 2 shows by way of example a longitudinal section of a sheathing element, which is 11 suitable for producing an anchor tube according to the invention as provided by a 12 first preferred embodiment, represented in a shortened form by being broken up;
14 Figure 2a shows a sectional view along section line Ila - Ila in Figure 2;
16 Figure 3 shows by way of example a longitudinal section, represented in a shortened form 17 by being broken up, of a static mixer, which is suitable for producing an anchor 18 tube according to the invention as provided by a preferred embodiment;
Figure 3a shows a sectional view along section line Illa - Illa in Figure 3;
22 Figure 4 shows a longitudinal section, in a shortened form by being broken up, of an 23 anchor tube according to the invention as provided by a preferred embodiment 24 after the rolling-in of the sheathing element and the static mixer;
26 Figure 5 shows a longitudinal section of the anchor tube shown in Figure 4, simplified in a 27 schematic form;
29 Figure 6 shows the anchor tube shown in Figure 5 after further working and 31 Figure 7 shows the anchor tube shown in Figure 6 with an injection connector inserted 32 therein, according to a preferred exemplary embodiment.
22015948.1 6 Agent Ref: 76576/00002 1 The method according to the invention for producing anchor tubes 1 by a procedure preferred 2 for this purpose is described with reference to Figures 1 to 7 and the anchor tube 1 according to 3 the invention as provided by a likewise preferred embodiment and a possible development are 4 described with reference to Figures 4 to 7. Figures 1 and 1 a 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 6 tube and may have, for example, an overall length (shown in a shortened form) of 2.5 m (or 7 some other length) and, for example a diameter in the range of 30-40 mm (or some other 8 diameter). In the example chosen, it is a steel tube with a tube bore 3 running through it 9 centrally along the longitudinal direction L thereof. In the section of Figure 1a, it is schematically shown that the tube bore 3 has a cross-section which, though round, deviates from an exact 11 circular shape by schematically indicated tolerances, the diameter of which, therefore, is to this 12 extent only approximately D1. The outer circumferential surface 4 of the tube 2 is also 13 approximately cylindrical, i.e. is subject to certain tolerances (not represented).
Figures 2 and 2a show a sheathing element 5, which in the example chosen is a portion of the 16 length of a hose made of plastics material. This plastics material may preferably be 17 polyethylene (PE) or polyamide (PA), for example with a yield stress of 15-45 N/mm2. Its outer 18 diameter D2 is approximately the same or slightly smaller than the diameter D1. In the example 19 chosen, the diameter D1 of the unround tube bore is about 12-13 mm (also dependent on the direction measured) and the diameter D2 is 12.5 mm, with a wall thickness of the sheathing 21 element 5 of 1.25 mm.
23 Figure 3 shows a so-called static mixer 6 as provided by a preferred embodiment. This is 24 produced from plastics, in the specific example from polyacetal (POM), the yield stress of which is in the range of about 65-75 N/mm2. In the example, the material of the static mixer 6 26 consequently has a higher strength than the material of the plastics hose of the sheathing 27 element 5. The static mixer 6, which is altogether of one piece but shown in a shortened form 28 by being broken up, has in the example an overall length of 600 mm and at the same time has 29 48 so-called chicanes 7, which lie one after the other in the longitudinal direction L. Each chicane 7 is formed by two spiral volute portions 8, which are twisted in terms of their angle with 31 respect to one another by 180 in the same elongate portion and for their part extend in each 32 case over half a revolution. Chicanes 7 that are adjacent in the longitudinal direction L have 33 respectively opposed helix pitches and are offset in their angle with respect to one another by a 34 quarter turn about the longitudinal axis, so that the structure can be flowed through in the 22015948.1 7 Agent Ref: 76576/00002 1 longitudinal direction L. The rib-like outer periphery 9 of the spiral volute portions 8 has angular 2 edges, the outer peripheries 9 lying at an imaginary cylindrical enveloping surface 10 that is 3 indicated in Figures 3 and 3a by dashed lines. In the example chosen, the static mixer 6 has an 4 outer diameter D4, which like the inner diameter D3 of the sheathing element
5, is about 10 mm.
It goes without saying, however, that deviations from all the aforementioned dimensions, in
It goes without saying, however, that deviations from all the aforementioned dimensions, in
6 particular diameters, and how they relate, are also possible within the scope of the invention.
7 The plastics material chosen for the sheathing element 5 has a lower hardness and easier
8 deformability than the plastics chosen for the static mixer 6.
9 For producing the anchor tube 1 according to the invention that is shown in Figures 4 and 5 in a 11 first preferred embodiment, firstly the static mixer 6 is inserted into the sheathing element 5, 12 which in the example is of the same length, and then the two parts 5, 6, inserted one in the 13 other, are together inserted through an end opening 11 in the longitudinal direction L into the 14 tube bore 3 and pushed in therein from the 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 16 3 and the small amount of lateral play determined by the chosen diameters D, to D4, the 17 sheathing element 5 and the static mixer 6 can be pushed in up to this longitudinal position, also 18 shown in Figure 5, without any problem as a result of the low hardness and strength of the 19 sheathing element 5 and the chosen relative sizes described above. In a next method step, a profiling 13, here in the form of a trapezoidal anchor thread 14, is rolled into the outer 21 circumferential surface 4 of the tube 2, the technique that is in fact suitable for thread rolling 22 being known to the person skilled in the art. Figure 4 pictorially shows the ridges 15 and 23 grooves 16 of the anchor thread 13, which in the drawing of Figures 5 to 7 is only represented in 24 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 reduction in the cross-26 section of the tube oriented transversely to the longitudinal direction L.
The deformations 27 occurring thereby also specifically cause an at least local cross-sectional reduction of the tube 28 bore 3. Figure 5 shows, in a sectional view of a schematically simplified form, that on account 29 of the cross-sectional reduction caused by the rolling, the inner surface 17 of the tube bore 3 now lies face to face against the outer side of the sheathing element 5, the tolerances in terms 31 of the shape and dimensions (not represented in the drawing of Figure 5) being compensated 32 by the comparatively soft sheathing element 5 as a result of corresponding local deformations.
33 Depending on the rolling-in conditions, it is possible for a certain constriction or cross-sectional 34 reduction of the tube bore 3 to occur either only in the region of the thread grooves 16 or along 22015948.1 8 Agent Ref: 76576/00002 1 the entire thread. At the same time, the diameters D, to D4 are made to match each other and 2 the rolling-in conditions and the sheathing element 5 in such a way that the narrowing of the 3 tube bore 3 also leads to a certain compression of the sheathing element 5 and a reduction in 4 the hollow cross-section thereof, i.e. to a lessening of its inner diameter D3. As a result of this, the inner surface 18 of the sheathing element 5 is pressed radially inward against the rib-like 6 outer periphery 9 of the spiral volute portions 8 of the static mixer 6. In this case, the 7 comparatively lower hardness of the sheathing element 5 also allows to this extent certain 8 deformations in the walls thereof, by which tolerances are compensated. It becomes clear that 9 the sheathing element 5 is then fixed in the longitudinal direction L in the bore 3 by the clamping force externally produced and that the static mixer 6 is fixed in the longitudinal direction in the 11 sheathing element 5 by the clamping force externally produced during the rolling-in, so that it is 12 therefore ultimately also fixed with respect to the tube 2 itself. If, during the rolling-in of the 13 profiling 13, there is a cross-sectional narrowing that is greater than the compression required 14 for the axial fixing of the sheathing element 5 and the static mixer 6, the sheathing element 5 allows, by its lower hardness in comparison with the static mixer 6, that the spiral volute portions 16 8 press, or possibly even cut, into the inner surface of the sheathing element 5 with their sharp 17 outer periphery 9. In this way, otherwise possible damaging, or possibly even rupturing, of the 18 static mixer 6 is prevented.
Figure 6 shows the anchor tube 1 as provided by a further possible method step according to a 21 preferred development of the method according to the invention. In this case, the end portion 22 12 of the tube bore 3 has been enlarged somewhat beyond the original diameter D1, in the 23 example chosen drilled out, and subsequently finely worked. At the same time, working of the 24 end face 19 has been performed, in order to make it smooth as shown.
26 Figure 7 shows, as a preferred further possibility, that a front elongate portion 20 of an injection 27 connector 21 has been forced into the widened end portion 12 with frictional engagement. The 28 injection connector 21 has an inner hollow space 22 with prepared separate inlet openings 23, 29 24 for various supply components to be supplied to the anchor rod 1 during grouting operation, as well as an outlet opening 25, which is at the front elongate portion 20 and opens out into the 31 tube bore 3 serving as an injection channel. During the finishing, the diameter of end portion 12 32 has been matched to the outer diameter of elongate portion 20 of the injection connector 21, or 33 to the outer diameter of the axially spaced-apart annular ridges provided there, not represented 34 any more specifically in Figure 7, in such a way that a great tensile force would be required to 22015948.1 9 Agent Ref: 76576/00002 1 pull the injection connector 21 out of the anchor tube 1. The rear elongate portion 26 is 2 intended for the purpose of entering a recess geometrically matched to it on an injection head 3 for supplying the supply components (for example the two components of a two-component 4 resin) on a rotationally driven inner part, so that the prepared inlet openings 23, 24 are in line with outlet openings of separate supply lines for the supply components. A
torque-transmitting 6 connection of the anchor rod 1 is possible by screwing its anchor thread 13 into a matching 7 threaded bore in the rotationally driven inner part of the flushing head. A
further special feature 8 of the injection connector 21 is that, before it is used for the first time, its inlet openings 23, 24 9 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 agent or by the components 11 of the grouting compound used, the adjacent, cross-sectionally wedge-shaped wall regions 12 acting as resilient valve flaps. A separate further static mixer 28 is fitted into the front portion of 13 hollow space 22 that is axially delimited by an annular shoulder 27. This static mixer does not 14 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 16 shoulder 27 and its forward axial movement is limited by the separate static mixer 6, which is 17 fixed in its position in relation to the anchor tube 1 in the way described above.
19 All features disclosed are (in themselves) pertinent to the invention. The disclosure content of the associated/accompanying priority documents (copy of the prior patent application) is also 21 hereby incorporated in full in the disclosure of the application, including for the purpose of 22 incorporating features of these documents in claims of the present application.
22015948.1 10
The deformations 27 occurring thereby also specifically cause an at least local cross-sectional reduction of the tube 28 bore 3. Figure 5 shows, in a sectional view of a schematically simplified form, that on account 29 of the cross-sectional reduction caused by the rolling, the inner surface 17 of the tube bore 3 now lies face to face against the outer side of the sheathing element 5, the tolerances in terms 31 of the shape and dimensions (not represented in the drawing of Figure 5) being compensated 32 by the comparatively soft sheathing element 5 as a result of corresponding local deformations.
33 Depending on the rolling-in conditions, it is possible for a certain constriction or cross-sectional 34 reduction of the tube bore 3 to occur either only in the region of the thread grooves 16 or along 22015948.1 8 Agent Ref: 76576/00002 1 the entire thread. At the same time, the diameters D, to D4 are made to match each other and 2 the rolling-in conditions and the sheathing element 5 in such a way that the narrowing of the 3 tube bore 3 also leads to a certain compression of the sheathing element 5 and a reduction in 4 the hollow cross-section thereof, i.e. to a lessening of its inner diameter D3. As a result of this, the inner surface 18 of the sheathing element 5 is pressed radially inward against the rib-like 6 outer periphery 9 of the spiral volute portions 8 of the static mixer 6. In this case, the 7 comparatively lower hardness of the sheathing element 5 also allows to this extent certain 8 deformations in the walls thereof, by which tolerances are compensated. It becomes clear that 9 the sheathing element 5 is then fixed in the longitudinal direction L in the bore 3 by the clamping force externally produced and that the static mixer 6 is fixed in the longitudinal direction in the 11 sheathing element 5 by the clamping force externally produced during the rolling-in, so that it is 12 therefore ultimately also fixed with respect to the tube 2 itself. If, during the rolling-in of the 13 profiling 13, there is a cross-sectional narrowing that is greater than the compression required 14 for the axial fixing of the sheathing element 5 and the static mixer 6, the sheathing element 5 allows, by its lower hardness in comparison with the static mixer 6, that the spiral volute portions 16 8 press, or possibly even cut, into the inner surface of the sheathing element 5 with their sharp 17 outer periphery 9. In this way, otherwise possible damaging, or possibly even rupturing, of the 18 static mixer 6 is prevented.
Figure 6 shows the anchor tube 1 as provided by a further possible method step according to a 21 preferred development of the method according to the invention. In this case, the end portion 22 12 of the tube bore 3 has been enlarged somewhat beyond the original diameter D1, in the 23 example chosen drilled out, and subsequently finely worked. At the same time, working of the 24 end face 19 has been performed, in order to make it smooth as shown.
26 Figure 7 shows, as a preferred further possibility, that a front elongate portion 20 of an injection 27 connector 21 has been forced into the widened end portion 12 with frictional engagement. The 28 injection connector 21 has an inner hollow space 22 with prepared separate inlet openings 23, 29 24 for various supply components to be supplied to the anchor rod 1 during grouting operation, as well as an outlet opening 25, which is at the front elongate portion 20 and opens out into the 31 tube bore 3 serving as an injection channel. During the finishing, the diameter of end portion 12 32 has been matched to the outer diameter of elongate portion 20 of the injection connector 21, or 33 to the outer diameter of the axially spaced-apart annular ridges provided there, not represented 34 any more specifically in Figure 7, in such a way that a great tensile force would be required to 22015948.1 9 Agent Ref: 76576/00002 1 pull the injection connector 21 out of the anchor tube 1. The rear elongate portion 26 is 2 intended for the purpose of entering a recess geometrically matched to it on an injection head 3 for supplying the supply components (for example the two components of a two-component 4 resin) on a rotationally driven inner part, so that the prepared inlet openings 23, 24 are in line with outlet openings of separate supply lines for the supply components. A
torque-transmitting 6 connection of the anchor rod 1 is possible by screwing its anchor thread 13 into a matching 7 threaded bore in the rotationally driven inner part of the flushing head. A
further special feature 8 of the injection connector 21 is that, before it is used for the first time, its inlet openings 23, 24 9 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 agent or by the components 11 of the grouting compound used, the adjacent, cross-sectionally wedge-shaped wall regions 12 acting as resilient valve flaps. A separate further static mixer 28 is fitted into the front portion of 13 hollow space 22 that is axially delimited by an annular shoulder 27. This static mixer does not 14 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 16 shoulder 27 and its forward axial movement is limited by the separate static mixer 6, which is 17 fixed in its position in relation to the anchor tube 1 in the way described above.
19 All features disclosed are (in themselves) pertinent to the invention. The disclosure content of the associated/accompanying priority documents (copy of the prior patent application) is also 21 hereby incorporated in full in the disclosure of the application, including for the purpose of 22 incorporating features of these documents in claims of the present application.
22015948.1 10
Claims (15)
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 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. Method according to Claim 1 or in particular according thereto, characterized in that a piece of tube or a piece of hose is used as the sheathing element (5).
3. Method according to one or more of the preceding claims or in particular according thereto, 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. Method according to one or more of the preceding claims or in particular according thereto, 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. Method according to one or more of the preceding claims or in particular according thereto, 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. Method according to one or more of the preceding claims or in particular according thereto, 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. Method according to one or more of the preceding claims or in particular according thereto, 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. Method according to one or more of the preceding claims or in particular according thereto, 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. Method according to one or more of the preceding claims or in particular according thereto, 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. 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. 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 12. Anchor tube according to one or more of the preceding claims or in particular according thereto, characterized in that a static mixer (6) of plastics material and a sheathing element (5) of plastics or rubber is provided.
13. Anchor tube according to one or more of the preceding claims or in particular according thereto, 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. Anchor tube according to one or more of the preceding claims or in particular according thereto, 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. Anchor tube according to one or more of the preceding claims or in particular according thereto, 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 |
|---|---|---|---|
| DE102008006235A DE102008006235A1 (en) | 2008-01-25 | 2008-01-25 | Anchor pipe and method for its production |
| DE102008006235.9 | 2008-01-25 | ||
| 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 true CA2713190A1 (en) | 2009-07-30 |
| CA2713190C CA2713190C (en) | 2015-10-13 |
Family
ID=40637891
Family Applications (1)
| 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)
| Country | Link |
|---|---|
| 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) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 WO PCT/EP2009/050156 patent/WO2009092630A1/en active Application Filing
- 2009-01-08 EP EP09703346A patent/EP2238313B1/en not_active Not-in-force
- 2009-01-08 CN CN200980103103.8A patent/CN101925721B/en not_active Expired - Fee Related
- 2009-01-08 AT AT09703346T patent/ATE533919T1/en active
-
2010
- 2010-06-11 ZA ZA2010/04186A patent/ZA201004186B/en unknown
Also Published As
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|---|---|
| EP2238313A1 (en) | 2010-10-13 |
| ZA201004186B (en) | 2011-08-31 |
| EP2238313B1 (en) | 2011-11-16 |
| CA2713190C (en) | 2015-10-13 |
| CN101925721B (en) | 2013-03-13 |
| DE102008006235A1 (en) | 2009-07-30 |
| AU2009207825C1 (en) | 2014-06-26 |
| AU2009207825B2 (en) | 2014-06-05 |
| WO2009092630A1 (en) | 2009-07-30 |
| ATE533919T1 (en) | 2011-12-15 |
| CN101925721A (en) | 2010-12-22 |
| AU2009207825A1 (en) | 2009-07-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20131127 |
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| MKLA | Lapsed |
Effective date: 20210108 |