CA2713194A1 - Injection spigot - Google Patents
Injection spigot Download PDFInfo
- Publication number
- CA2713194A1 CA2713194A1 CA2713194A CA2713194A CA2713194A1 CA 2713194 A1 CA2713194 A1 CA 2713194A1 CA 2713194 A CA2713194 A CA 2713194A CA 2713194 A CA2713194 A CA 2713194A CA 2713194 A1 CA2713194 A1 CA 2713194A1
- Authority
- CA
- Canada
- Prior art keywords
- injection
- wall
- spigot
- injection spigot
- predetermined breaking
- 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.)
- Abandoned
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/80—Ground anchors
- E02D5/808—Ground anchors anchored by using exclusively a bonding material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
Abstract
The invention relates to an injection spigot (24), preferably for an injection head for injection drilling anchors with independent supply of a first and second supply component, wherein the injection spigot (24) has a housing (34) with an internal cavity which has at least one outlet opening for the outlet of the first and the second supply component. According to the invention, an advantageous improvement may be made, wherein the wall of the housing (34) has at least one first pre-determined breaking point (35) for forming a first inlet opening (36) for a first supply component under pressurisation and at a distance therefrom at least one second pre-determined breaking point (37) to form a second inlet opening (38) for a second supply component under pressurisation. The invention further relates to an injection head for drilling and pressing of drilling injection anchors in which an injection spigot (24) is inserted.
Description
Agent Ref: 76576/00003 1 Injection Spigot 3 The present invention relates to an injection spigot, preferably for an injection head for injection 4 drilling anchors which is suitable for separately supplying at least a first and a second supply component, the injection spigot having a housing which forms an inner cavity that has at least 6 one outlet opening for exit of the first and second supply components.
8 An injection head of the stated type is known in the prior art from DE
102007008966 Al. As 9 described there, such an injection head is suitable in particular for drilling-in and grouting so-called self-drilling injection drilling anchors in bedrock to be stabilized, in rock or the like.
11 Injection drilling anchors of this kind, which are known per se, may have, for example, a 12 separate drill bit at their tip and have an injection channel running through them in their 13 longitudinal direction, which generally opens out at the front end of the anchor into one or more 14 outlet openings. During the drilling-in, preferably a pressurized flushing medium, for example air or water, can be supplied to the drill hole through the injection channel. In order to grout the 16 injection drilling anchor in the drill hole, a grouting compound can then be forced through the 17 flushing head and the injection channel into the drill hole gap surrounding the injection drilling 18 anchor. Accordingly, the flushing head is used according to the working step for supplying 19 flushing medium (for example water) or grouting compound. Suitable grouting compounds include in particular so-called two-component synthetic resins, one component of which may be 21 a resin (for example water glass) and the other component of which may be a catalyst. To 22 achieve the effect that the two components only cure with each other in the drill hole, they are 23 fed to the injection head separately and only meet in a lost part that is connected to the injection 24 anchor. In DE 102007008966 Al, this lost part is a so-called flushing nut, which can be screwed, with an easily rotatable external thread, into the inner part, and with a comparatively 26 more difficult-to-rotate external thread onto the anchor rod. After the drilling-in and grouting of 27 the injection drilling anchor, the direction of rotation of the drilling drive is reversed to detach the 28 flushing head, the different unscrewing forces causing the flushing nut to leave the inner part as 29 a lost part and to remain screwed on the anchor rod. It will be understood from the above explanation that the commonly used term flushing head means a device which serves not only 31 for flushing the drill hole but also for grouting it. For subsequent use, the injection head may be 32 supplied with a further injection drilling anchor, onto the end of which a further flushing nut is 33 already screwed, possibly ready-loaded in a magazine. The known flushing nut forms a cavity 34 in the interior and has a first inlet opening for connection to a supply line for the separate supply 22016074.1 1 Agent Ref: 76576/00003 1 of a first component as well as second inlet openings for connection to supply lines for supplying 2 a second component, so that the inner cavity to this extent forms a line connection for the 3 supply lines. The inlet openings are produced in the form of bores. To prevent leakages, 4 annular grooves with sealing O-rings inserted in them are provided alongside the bores. With regard to the fact that the known flushing nut is also used for torque transfer, it must consist of a 6 sufficiently strong material. In particular in conjunction with this, the production of this 7 component proves to be relatively complex with regard to the various bores, sealing grooves 8 and types of thread, it also being required that the size does not become less than a certain 9 minimum value, since the anchor rod must be screwed into the flushing nut.
When the known flushing nut is used, it is also not possible to rule out the possibility of a certain return flow of the 11 supply components out of the flushing nut after the supply components have been separately 12 forced into the flushing nut and the injection anchor, and the component supply or pressure has 13 subsequently been switched off.
Against this background, it is an object of the invention to develop an injection spigot of the type 16 described at the beginning advantageously such that, in particular, the aforementioned possible 17 disadvantages are avoided to the greatest extent possible.
19 The object is achieved according to the invention first and foremost in conjunction with the features that the wall of the housing has at least one first predetermined breaking point for 21 forming a first inlet opening for a first pressurized supply component and, at a distance from it, 22 at least one second predetermined breaking point for forming a second inlet opening for a 23 second pressurized supply component. The term predetermined breaking point is understood in 24 a broad sense here within the scope of the invention and, with regard to the geometrical extent, covers the possibilities of meaning not only punctiform and linear but also two-dimensional 26 extents. The invention also includes in its general concept that the housing wall of the injection 27 spigot or connection piece has, as it were in preparation for inlet openings at specific locations 28 of the housing, initially local weak points, preferably wall thickness reductions and/or locally 29 limited punctiform or linear perforations, for example outlining the intended inlet opening, and that the inlet opening is only provided or opened up as a result of a certain pressure being 31 applied. In this way, as explained in more detail below, advantages can be achieved both in 32 terms of production and in terms of use. Firstly, in view of the fact that the inlet openings are 33 still entirely, or at least substantially, closed before pressure is applied, in particular also before 34 the injection spigots are used, protection from damage and soiling is achieved. It is preferably 22016074.1 2 Agent Ref: 76576/00003 I provided that the first and second predetermined breaking points are each formed at a wall 2 region with a reduced wall thickness in comparison with adjacent wall regions. In particular 3 whenever the wall thickness is in this case reduced only to the extent that there is still a wall 4 thickness (albeit perhaps extremely small), that is to say no perforations are provided, production can be simplified. It is considered to be a practical configuration for the housing of 6 the injection spigot to have a substantially rotationally symmetrical, preferably substantially 7 cylindrical, wall, at one of the longitudinal ends of which the outlet opening for exit of the supply 8 components in the direction of the injection anchor is disposed. At the longitudinal end opposite 9 from the outlet opening, the injection spigot may have an end wall on which at least one predetermined breaking point for a first inlet opening is formed. In the case of a preferred 11 embodiment, it is provided that the predetermined breaking point for the first inlet opening is 12 formed at a wall region, preferably of a circular outline, of which the wall thickness decreases 13 from the outside inward, preferably radially symmetrically and in particular linearly in the radial 14 direction. If the wall thickness thereby decreases toward the center point, there is a punctiform predetermined breaking point at which breaking open occurs first as a result of pressurization by 16 a supply component supplied through the first supply line and then, depending on the pressure, 17 further tearing open of the inlet opening may occur. With respect to one or more so-called 18 second inlet openings for the second supply component, it is preferred that one or more 19 predetermined breaking points, preferably two lying opposite each other on the circumference, are formed correspondingly for this on the circumference of the cylindrical wall of the injection 21 spigot.
23 It is preferred in this connection that one or more predetermined breaking points, each for a 24 second inlet opening, are formed at a wall region, preferably of a circular outline, with a wall thickness which is suddenly reduced in comparison with adjacent wall regions and decreases in 26 the longitudinal direction of the injection spigot toward the longitudinal end thereof having the 27 outlet opening, preferably decreasing linearly in this direction. To achieve a wall region with a 28 suddenly reduced wall thickness, a depression that forms as it were a cup may be provided in a 29 wall with a comparatively great wall thickness. The preferred predetermined breaking point is located where there is the smallest wall thickness on account of the geometry chosen. Once 31 this location is broken open, depending on the level of pressurization, progressive formation of a 32 tear may occur, starting from there, in particular along the transition in the wall thickness, in the 33 direction of increasing wall thickness of the thickness-reduced wall region, the form of the tear 34 determining the peripheral contour of the inlet opening. Generally, the progression of the tear is 22016074.1 3 Agent Ref: 76576/00003 1 limited by the pressure subsiding as a result of the already existing tear and a certain deflection 2 of the wall regions around which the tear forms. To this extent, the part of the wall region of 3 reduced wall thickness that has not been torn into at the end assumes a retaining function and, 4 in the case of an elastically deformable material, also assumes so to speak the function of a bending joint at which the wall portion around which the tear forms is articulated like a flap 6 valve. Sufficiently elastic properties have the advantageous effect that the flap valves move 7 resiliently back into their starting position of their own accord when the pressure is switched off, 8 that is to say in particular when the supplying of the supply components is ended at the end of 9 the anchor grouting operation, as a result of which the inlet openings are substantially closed again. In this way, return flow is prevented (as in the case of heart valves), in particular once 11 the injection head has been detached from the injection spigot or connector. Within the scope 12 of the invention, a variation in the wall thickness is possible within wide ranges of values or 13 relative values, both within the wall regions of reduced wall thickness and in relation to the 14 adjacent thicker wall regions. It is preferably provided that, at the wall region of reduced wall thickness at which the predetermined breaking point for the second inlet opening is formed, the 16 maximum wall thickness is a multiple of the minimum wall thickness occurring there, preferably 17 two to four times, and that the maximum wall thickness of this wall region of reduced wall 18 thickness is less than the wall thickness of the wall region surrounding the cup mentioned, 19 preferably approximately half or approximately one third in relation thereto. It is also preferred within the scope of the invention that the injection spigot is produced from plastics material, in 21 particular from polyamide. It is also preferred in this connection that the injection spigot is 22 designed as a plastics injection molding or is produced by the plastics injection-molding 23 process.
It is regarded as a suitable development that the cylindrical wall of the injection spigot has, in 26 the rear region of its length, in the area of the wall regions of reduced wall thickness that are 27 associated with the second inlet openings, a continuous peripheral annular groove on the 28 outside. This allows the flow of the supply component to the inlet openings distributed around 29 the circumference to be made more uniform. In particular if it is produced as a plastics injection molding, this provides the possibility in a simple manner that the cylindrical wall of the injection 31 spigot has, in a front region of the length between the predetermined breaking points for the 32 second inlet openings and the outlet opening, on the outside, one or more annular projections, 33 integrally formed, spaced apart in the longitudinal direction and extending in the circumferential 34 direction. This front region of the length may serve for inserting the injection spigot into the 22016074.1 4 Agent Ref: 76576/00003 I injection channel (in particular in a widening of the channel) of the injection anchor. The terms 2 front and rear, or front end and rear end, relate to the direction of advancement of an anchor 3 during drilling-in. Given diameters that are suitably made to match one another, the ribs 4 undergo a certain deformation during insertion and oppose later withdrawal of the injection spigot or connector from the anchor, so that a desired high axial retaining force can be realized.
6 As an alternative or in combination, there is the possibility that the cylindrical wall of the injection 7 spigot has, on each of both sides of the already mentioned circumferential groove, a raised and 8 integrally formed annular bead running continuously around the circumference. If the diameters 9 are appropriately made to match, the two annular beads undergo a certain deformation during insertion of the injection spigot into a recess provided for this purpose in the injection head or in 11 the rotatable inner part thereof, so that the annular beads act as seals.
13 According to the statements made above, the known flushing nut, in which the two resin 14 components meet for the first time, is replaced by the injection spigot according to the invention, which can be produced at comparatively lower cost. In particular, it may be a ready-to-install 16 polyamide injection molding with ready-integrated seals and flap valves.
For use, the injection 17 spigot is preferably disposed at the end of the injection anchor, that is to say ahead of a static 18 mixer possibly provided therein. In comparison with the conventional flushing nut, it is of 19 advantage that the anchor rod is not screwed into the flushing nut, but instead the injection spigot can be inserted into the anchor rod. The miniaturization of the injection spigot or 21 connector thereby made possible, to this extent achieves a great cost advantage over the 22 known flushing nut, which requires laborious machining. As explained, in the inserted state of 23 the injection spigot or connection piece, the circumferential ribs that are possible in the front 24 region of the length thereof bring about an increase in the axial retaining force, which as a result can be chosen preferably to be greater than the axial retaining force between the inner part of 26 the flushing head and the injection spigot, so that, when the injection anchor is unscrewed from 27 the flushing head, the injection spigot is also automatically and reliably withdrawn axially from 28 the flushing head and can remain as a lost component on the anchor, acting at the same time 29 as a terminal seal. The cost advantage that is possible by the invention is obtained in particular because of the preferred use as a lost part and the numbers of items that are to this extent 31 required.
22016074.1 5 Agent Ref: 76576/00003 I The invention is described in more detail below with reference to the accompanying figures, 2 which show a preferred exemplary embodiment of the injection spigot according to the invention 3 and a preferred use, and in which:
Figure 1 shows a longitudinal section of the injection spigot according to the invention as 6 provided by a first preferred embodiment, in conjunction with an injection head 7 preferred for use, after the grouting of a drilling injection anchor;
9 Figure 2 shows the arrangement shown in Figure 1, but after the detachment of the injection spigot from the injection anchor;
12 Figure 3 shows a sectional view along a section line III-III in Figure 2;
14 Figure 4 shows a longitudinal section along section line IV-IV according to Figure 2;
16 Figure 5 shows a perspective view of the arrangement represented in Figure 2;
18 Figure 6 shows the injection spigot that is shown in Figure 1, inserted into the injection 19 anchor, with the representation shortened by being broken up;
21 Figure 7 shows the injection spigot in an enlargement of detail VII in Figure 1, with inlet 22 openings opened;
24 Figure 8 shows the arrangement shown in Figure 7, but with a new injection spigot with inlet openings still closed;
27 Figure 9 shows the end of the grouted injection anchor that is shown in Figure 1, after the 28 detachment of the injection head from the injection spigot;
Figure 10 shows a perspective view of the injection spigot that is shown in Figure 1, but 31 enlarged in comparison, and 33 Figure 11 shows a longitudinal section of the injection spigot that is shown in Figure 1, 34 likewise enlarged in comparison.
22016074.1 6 Agent Ref: 76576/00003 2 The injection head 1 according to the invention, as provided by a first preferred embodiment, is 3 described with reference to Figures 1 to 10, in conjunction with components interacting 4 therewith. The injection head has a flushing head 2, which comprises an outer housing 3 and an inner part 4, which is accommodated rotatably therein in relation to a longitudinal axis A.
6 Associated with the outer housing 3 is a first flushing ring 5, attached to the outside of which is a 7 first supply connection 6 for supplying a first, preferably liquid, supply component, and a second 8 flushing ring 7, which is kept at a distance axially from the first flushing ring 5 in the longitudinal 9 direction L (i.e. in the direction of the longitudinal axis A) and attached to the outside of which is a second supply connection 8 for the separate supply of a further, preferably liquid, supply 11 component. The inner part 4 has, at the rear end, a connection 9 with a receiving opening 10 12 for receiving in a rotationally form-fitting manner a connecting end 11 of a drilling drive 12, only 13 the front portion of which is indicated by dashed lines. At the front end, the inner part has, as 14 connecting means for the connection of an anchor rod 14 provided with an external anchor thread 13 (cf. also Figure 6), a threaded bore 17 provided with an internal thread 16 matching 16 the anchor thread (cf. also Figures 2 and 4). The threaded bore 17 with the internal thread 16 17 represents to this extent a connecting means for the connection of an anchor rod 14 provided 18 with a corresponding external anchor thread 13. It is noted that only the rearmost anchor rod 14 19 of a drilling injection anchor 15 is respectively represented in the figures, but, in a way known per se, said anchor may, if required, also have a number of anchor rods connected for example 21 by threaded coupling nuts, and in particular a drill bit at the tip. As Figures 1, 7 and 8 22 particularly show, the rotatable inner part 4 has inside it a first supply line 18, which is 23 connected to the first supply connection 6, and four second supply lines 19, which are spaced 24 apart around the circumference each by a quarter turn and are connected to the second supply connection 8. The first supply line is formed by a bore 20 running centrally in the longitudinal 26 direction L and two radial bores 21 running radially from the rear end thereof to the surface.
27 The first and second supply lines 18, 19 are directed in the direction of a line connection 22 28 shared by them in the inner cavity 23 of an injection spigot 24. The latter is inserted (cf. Figures 29 7 and 8), with the rear region 25 of its length, into a recess 26, which is disposed in axial extension of the threaded bore 17, is of reduced cross-section in comparison with the latter and 31 is substantially cylindrical, and inserted in the region of the front portion 27 of its length in a 32 force-fitting manner into a widening 28 of the injection channel 29 of the anchor rod 14 that is 33 screwed into the threaded bore 17. A supply line for a desired first supply component may be 34 connected to the first supply connection 6 and this first supply component supplied to the 22016074.1 7 Agent Ref: 76576/00003 ? injection spigot 24 through the annular groove 31 in the first flushing ring 5, the first supply line 2 18 and a sprung nonreturn valve 30, which is disposed at the end of the line and opens when 3 there is sufficient supply pressure. A supply line for a further desired supply component may be 4 connected to the second supply connection 8 and this further supply component supplied to the injection spigot 24 separately from the first supply component, through the annular groove 33 in 6 the second flushing ring 7, through the second supply lines 19 and through the sprung 7 nonreturn valves 32, which open when there is sufficient supply pressure. As Figure 8 shows, 8 the housing 34 of the injection spigot 24 has a prepared first predetermined breaking point 35 9 for forming a first inlet opening 36 (cf. Figure 7) for the first supply component and, at a distance from this breaking point, two second predetermined breaking points 37 each for forming a 11 second inlet opening 38 (cf. Figure 7). Said predetermined breaking points are respectively 12 formed at a wall region 39, 40 with a reduced wall thickness in comparison with adjacent wall 13 regions and are located there, in the region of the smallest wall thickness in each case. The 14 term predetermined breaking point should be understood in a broad sense here and geometrically includes the possibility of a punctiform, linear or two-dimensional extent. If, as 16 represented in Figure 8, a new injection spigot is used, its predetermined breaking points are 17 initially not yet broken, i.e. the associated inlet openings 36, 38 are still closed. With regard to 18 their shaping and dimensioning (in particular with regard to the minimum wall thickness chosen), 19 the predetermined breaking points 35, 37 are in each case made to match the supply pressures for the supply components that can usually be set during the operation of the injection head, in 21 such a way that they break open under suitable pressurization, as represented in Figure 7, so 22 that the respective inlet opening 36, 38 is opened and the supply component, which is in each 23 case still separate there, flows into the inner cavity 23. Only in this cavity 23, i.e. at the line 24 connection 22, do the two separately supplied components (for example resin and catalyst) come into contact. As Figure 11 illustrates in particular, the inner cavity 23 has an outlet 26 opening 41 for the joint exit of the first and second supply components in the direction of the 27 drilling injection anchor 15.
29 As mentioned above, Figure 1 shows the injection head 1 after a drilling injection anchor 15 (only partially represented) has been drilled into a wall 44 (for example of rock) and after the 31 drilling injection anchor 15 has been grouted in the formed drill hole 45 by means of a grouting 32 compound 46, which has been formed by mixing the two supply components supplied through 33 the supply connections 6, 8 and has then set in the drill hole. As a result of the anchor thread 34 13 and the unevennesses in the wall of the drill hole, an effective axial shearing bond is formed 22016074.1 8 Agent Ref: 76576/00003 I by'the grouting compound 46 that has hardened out a short time after mixing.
For better 2 representation of details, in Figure 1 the grouting compound 46 is shown only in the drill hole 45, 3 i.e. not in the flushing head and the drilling injection anchor. In Figure 1, the drilling injection 4 anchor 15 has been drilled into the wall to a desired depth, at which a supporting plate 47 (so-called collar plate) is pressed against a lagging mat 49, provided in front of the wall 44, by a ball 6 seat nut 48, which is screwed on by means of an internal thread until it comes to an axial stop 7 against the rotatable inner part 4.
9 According to a method according to the invention, which is preferred in particular with regard to the use shown in Figure 1, it is regarded as suitable that, in preparation for a drilling operation, 11 first the preassembled unit comprising at least one anchor rod 14 and an injection spigot 24 that 12 is represented in Figure 6 is brought to the flushing head that is shown in Figures 2 to 5 and is 13 connected to it. To produce this unit, first of all a first so-called static mixer 50, which is known 14 per se and has a multiplicity of so-called chicanes 51 of helical form disposed one behind the other in the longitudinal direction L, is pushed into the injection channel 29 with a surrounding, in 16 particular separate, enclosing element 52, which may be, for example, a pipe or a flexible tube, 17 and axially fixed therein with the enclosing element 51, in a suitable way, so that it forms an 18 axially fixed barrier to the flow pressure of the supply components in the injection channel 29 19 that can be flowed through by the different supply components, which, as they flow through, undergo intensive mixing. In the exemplary embodiment chosen, the injection spigot 24 21 represented in detail in Figure 11 was subsequently inserted with the front region 27 of its 22 length, at the end face of which there is the outlet opening 41, into a channel widening 28 of the 23 anchor rod 14 adjacent the static mixer 50. In this case, on account of the matched diameters, 24 the region 27 of the length with the cylindrically machined channel widening 28 forms a first insert-press connection 53, which can only be separated again if a relatively high, so-called first 26 axial force is applied. The outer side of the injection spigot 24, which in the example is 27 rotationally symmetrical and substantially cylindrical, forms at the transition from the rear region 28 25 of the length to the front region 27 of the length, by a sudden reduction in cross-section, an 29 axial stop face 54, which forms an axial stop with the end face 55 of the anchor rod 14. The inner cavity 23 is of a substantially cylindrical form. In it, a second static mixer 56 has been 31 fitted and pushed against a rear-end axial stop, formed by an annular step 73 in the cavity 23.
32 In this respect, the terms rear end and front end (or rear and front) again relate to the direction 33 of advancement of the anchor rod during drilling-in. In this way, the second static mixer 56 is 34 fixed in the longitudinal direction L, apart from a small freedom of movement permissible in the 22016074.1 9 Agent Ref: 76576/00003 T example, without a connection to the injection spigot 24 at its circumference being necessary 2 (even though such a connection would be additionally possible). While the annular stage 73 3 forms the rearward axial stop, a forward displacement is prevented by the axially fixed static 4 mixer 50. For automated drilling and grouting operation, the unit shown in Figure 6 may be preassembled in relatively large numbers and preferably fed to the arrangement shown in 6 Figures 2 to 5 particularly while loaded in a magazine. For connection to the injection head 1, 7 the anchor rod 14 preassembled with the injection spigot 24 is screwed by means of its anchor 8 thread 13 into the threaded bore 17 of the rotatable inner part 4, until this is not possible any 9 further (as indicated in Figure 8) at the end of the inner thread 16 or at an axial stop (the latter may lie at the rear end of the injection spigot 24). In this case, the injection spigot 24 is pushed, 11 with the rear region 25 of its length, into the substantially cylindrical recess 26 (cf. Figure 2) in 12 the longitudinal direction. The shaping or dimensioning is chosen such that the rear end face 58 13 (cf. Figure 11) of the injection spigot 24, at which the first predetermined breaking point 35 for 14 the first inlet opening 36 is located, comes to lie axially against a pressing bush 62, which has been inserted into the inner part 4, and the sprung nonreturn valve 30, which has been axially 16 fixed in the center channel of the bush. In this way, front-end and rear-end axial fixing of the 17 injection spigot 24 is also achieved. In this position, which is shown enlarged in Figures 7 and 18 8, moreover, suitable positioning of the second inlet openings 38 (or of the second 19 predetermined breaking points 37) in the longitudinal direction L in relation to the outlet end of the second supply lines 19, or the sprung nonreturn valves 32 axially held therein, is also 21 ensured. As shown in the figures, on the cylindrical wall 59 of the injection spigot 24, at the 22 axial position of the wall regions 40 of reduced wall thickness, there is a peripheral annular 23 groove 60 on the outside, which is axially in line with the supply lines 19. The rear region 25 of 24 the length of the injection spigot 24 forms, with the recess 26 in the inner part 4, a second insert-press connection 61, the so-called second axial force that can be transferred by this 26 connection 61 being less than the first axial force that can be transferred by the first insert-press 27 connection 53. If the injection head 24 or its rotatable inner part 4 is later unscrewed from the 28 anchor rod 14 (preferably by reversing the direction of rotation on the drilling drive), the axial 29 forces of different magnitude that can be transferred by the two insert-press connections 53, 61 have the effect that the injection spigot 24 is automatically withdrawn from the inner part 4 and 31 can remain as a lost part at the end of the injection drilling anchor.
Starting from the installation 32 state shown in Figure 8, in which the first and second predetermined breaking points 35, 37 are 33 not yet broken, i.e. the first and second inlet openings 36, 38 are still closed, in order to arrive at 34 the state shown in Figure 7 (corresponding to Figure 1), the respective individual supply 22016074.1 10 Agent Ref: 76576/00003 I component is supplied under pressure through the supply connections 6, 8, whereby the sprung 2 nonreturn valves 30, 32 open, the respective supply components press against the wall regions 3 39, 40 of reduced wall thickness and finally break the predetermined breaking points 35, 37, so 4 that the inlet openings 36, 38 are opened up. In the example chosen, the injection spigot 24 is a component produced in one piece from the plastics material polyamide by the injection-molding 6 process.
8 A further special feature of the injection head shown as an exemplary embodiment is that on it 9 there is a releasable coupling securement for the torque-transferring connecting end 11 of the drilling drive 12. As Figures 3 and 4 illustrate in particular, this is brought about by two securing 11 elements 64, which in the example are pins 65, and by the inner part 4 having, in a cross-12 section Q running perpendicularly to the longitudinal direction L at the receiving opening 10, two 13 parallel spaced-apart through-bores 66, which serve as mounting openings 68 for the pins, 14 these being adapted in their diameter for releasable clamping fastening of the pins. Suitable pins are commercially available and known with regard to the general way in which they 16 function. The lateral spacing a between the through-bores 66 is chosen to be less than the 17 diameter D of the adjacent portion 67 of the length of the receiving opening 10. This means 18 that, in the fastening or clamping state of the pins 65, the cross-section of the receiving opening 19 10 is reduced in comparison with the state without pins 65. In the exemplary embodiment, the drilling drive 12 chosen is one in which the connecting end 11 has, at a distance behind its 21 connecting portion 69, a projection 70 which runs in the form of a ring around the circumference 22 and the diameter of which substantially corresponds to the diameter D. The releasable securing 23 elements 64 make the projection 70 act like a securing projection with the effect of a form fit, 24 which, in the direction of a longitudinal projection (along the longitudinal direction L), radially overlaps the securing elements 64 in the fitted state and thereby forms a releasable separating 26 securement with a form fit in the longitudinal direction L when the drilling drive connecting end 27 11 is connected. In the example shown, the connecting portion 69 of the drilling drive 28 connecting end 11, reaching as far the front free longitudinal end, is provided, for torque 29 transfer, with an external thread 71, which matches an internal thread 72 provided in a portion of the length of the receiving opening 10. The aforementioned features achieve the effect that, 31 when the direction of rotation of the drilling drive 12 is reversed for separation from the drilling 32 injection anchor 15, the inner part 4 cannot become unscrewed from the drilling drive 33 connecting end 11, so that constant torque transfer is ensured, and with it reliable operation.
34 Detachment of the drilling drive 12 from the flushing head 2 is only made possible by the pins 65 22016074.1 11 Agent Ref: 76576/00003 T bofh being removed from the bores 66 by a manipulation - one generally familiar to the person 2 skilled in the art. The pins 65 are selected such that they withstand the centrifugal forces 3 occurring during operation and the percussive stress during drilling.
Further special features of the preferred embodiment, shown by way of example, of the injection 6 spigot according to the invention are explained in more detail below with reference to Figures 6 7 to 11. Figure 10 in particular clearly shows that the injection spigot is formed as a substantially 8 rotationally symmetrical sleeve part. It is shown in conjunction with Figure 11 that the 9 predetermined breaking point 35 for the first inlet opening 36 (cf. Figure 7) is formed on the rear end wall 58 at a wall region 39 which to this extent is circular and the wall thickness of which 11 decreases from the outside inward in a radially symmetrical linear manner to a small fraction of 12 the peripheral wall thickness. At the predetermined breaking point 35, the wall thickness may 13 be reduced in particular down to a membrane- or film-like residual thickness, so that tearing 14 open occurs even under comparatively low pressurization. Figure 7 shows the first inlet opening 36, which is thereby formed on the assumption that tear lines in the wall 39 radiate out 16 from the predetermined breaking point 35 in the form of a star and through which the first supply 17 component, supplied through the first supply line 18, is supplied into the inner cavity 23.
18 Although Figure 1 shows the state after the grouting of the injection anchor, the enlargement 19 according to Figure 7 still shows for purposes of illustration the open position of the inlet openings 36, 38, which then goes over resiliently into a closed position of the wall portions.
21 Correspondingly, on account of the elastic property of the plastics material used, Figure 9 22 shows that the wall regions 39, 40 of reduced wall thickness are deformed back again of their 23 own accord after the unscrewing of the flushing head, so that the inlet openings 36, 38 are 24 substantially closed again. However, to present a clear overview in Figure 9 also, the injection spigot 24 and the drilling injection anchor 15 are shown without the grouting compound 46 26 inside that is still present there. Figures 10 and 11 also reveal that the two predetermined 27 breaking points 37 lying opposite each other at the circumference, each for a second inlet 28 opening 38 (cf. Figure 7), respectively lie at a wall region 40 which has a circular outline and a 29 suddenly reduced wall thickness in comparison with adjacent wall regions.
While the inner wall of the cavity 23 runs in a cylindrical manner, the outer side of the wall regions 40 is of a planar 31 form and thereby runs at an acute angle with respect to the longitudinal direction L. Each wall 32 region 40 to this extent forms an inclined planar base of a cup-like depression formed in the 33 housing wall axially level with the annular groove 60. The shaping described has the effect of 34 pre-setting the position of the predetermined breaking point 37 at the location of least wall 22016074.1 12 Agent Ref: 76576/00003 I thickness. This is the point of intersection of the circular peripheral line of wall region 40 with 2 the sectional plane of Figure 11 that lies facing the front region 27 of the length or the outlet 3 opening 41. The terms front end and rear end or front and rear relate here, as before, to the 4 direction of advancement during the drilling-in of the anchor.
6 After the tearing-open of the predetermined breaking point 37, pressurization causes tearing to 7 continue from there along part of the circular peripheral line of wall region 40. As Figure 7 8 shows in this respect, the outlined portion of the wall region 40 is inwardly deflected by the 9 pressurization and forms so to speak a flap valve with a valve flap 76, which is articulated at a bending joint 77. The latter is formed by part of the wall region 40 that has not been reached by 11 the tear on account of its greater wall thickness in comparison with the predetermined breaking 12 point 37. Figures 10 and 11 also show that the cylindrical wall 59 in the front region 27 of the 13 length between the predetermined breaking points 37 and the outlet opening 41 has on the 14 outside a multiplicity of annular projections or ribs 63 spaced apart in the longitudinal direction L.
Provided on each of both sides of the circumferential groove 60 on the cylindrical wall 59 is a 16 raised and integrally formed annular bead 78, running around the circumference in the form of a 17 ring, to seal the annular groove 60.
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.
22016074.1 13
8 An injection head of the stated type is known in the prior art from DE
102007008966 Al. As 9 described there, such an injection head is suitable in particular for drilling-in and grouting so-called self-drilling injection drilling anchors in bedrock to be stabilized, in rock or the like.
11 Injection drilling anchors of this kind, which are known per se, may have, for example, a 12 separate drill bit at their tip and have an injection channel running through them in their 13 longitudinal direction, which generally opens out at the front end of the anchor into one or more 14 outlet openings. During the drilling-in, preferably a pressurized flushing medium, for example air or water, can be supplied to the drill hole through the injection channel. In order to grout the 16 injection drilling anchor in the drill hole, a grouting compound can then be forced through the 17 flushing head and the injection channel into the drill hole gap surrounding the injection drilling 18 anchor. Accordingly, the flushing head is used according to the working step for supplying 19 flushing medium (for example water) or grouting compound. Suitable grouting compounds include in particular so-called two-component synthetic resins, one component of which may be 21 a resin (for example water glass) and the other component of which may be a catalyst. To 22 achieve the effect that the two components only cure with each other in the drill hole, they are 23 fed to the injection head separately and only meet in a lost part that is connected to the injection 24 anchor. In DE 102007008966 Al, this lost part is a so-called flushing nut, which can be screwed, with an easily rotatable external thread, into the inner part, and with a comparatively 26 more difficult-to-rotate external thread onto the anchor rod. After the drilling-in and grouting of 27 the injection drilling anchor, the direction of rotation of the drilling drive is reversed to detach the 28 flushing head, the different unscrewing forces causing the flushing nut to leave the inner part as 29 a lost part and to remain screwed on the anchor rod. It will be understood from the above explanation that the commonly used term flushing head means a device which serves not only 31 for flushing the drill hole but also for grouting it. For subsequent use, the injection head may be 32 supplied with a further injection drilling anchor, onto the end of which a further flushing nut is 33 already screwed, possibly ready-loaded in a magazine. The known flushing nut forms a cavity 34 in the interior and has a first inlet opening for connection to a supply line for the separate supply 22016074.1 1 Agent Ref: 76576/00003 1 of a first component as well as second inlet openings for connection to supply lines for supplying 2 a second component, so that the inner cavity to this extent forms a line connection for the 3 supply lines. The inlet openings are produced in the form of bores. To prevent leakages, 4 annular grooves with sealing O-rings inserted in them are provided alongside the bores. With regard to the fact that the known flushing nut is also used for torque transfer, it must consist of a 6 sufficiently strong material. In particular in conjunction with this, the production of this 7 component proves to be relatively complex with regard to the various bores, sealing grooves 8 and types of thread, it also being required that the size does not become less than a certain 9 minimum value, since the anchor rod must be screwed into the flushing nut.
When the known flushing nut is used, it is also not possible to rule out the possibility of a certain return flow of the 11 supply components out of the flushing nut after the supply components have been separately 12 forced into the flushing nut and the injection anchor, and the component supply or pressure has 13 subsequently been switched off.
Against this background, it is an object of the invention to develop an injection spigot of the type 16 described at the beginning advantageously such that, in particular, the aforementioned possible 17 disadvantages are avoided to the greatest extent possible.
19 The object is achieved according to the invention first and foremost in conjunction with the features that the wall of the housing has at least one first predetermined breaking point for 21 forming a first inlet opening for a first pressurized supply component and, at a distance from it, 22 at least one second predetermined breaking point for forming a second inlet opening for a 23 second pressurized supply component. The term predetermined breaking point is understood in 24 a broad sense here within the scope of the invention and, with regard to the geometrical extent, covers the possibilities of meaning not only punctiform and linear but also two-dimensional 26 extents. The invention also includes in its general concept that the housing wall of the injection 27 spigot or connection piece has, as it were in preparation for inlet openings at specific locations 28 of the housing, initially local weak points, preferably wall thickness reductions and/or locally 29 limited punctiform or linear perforations, for example outlining the intended inlet opening, and that the inlet opening is only provided or opened up as a result of a certain pressure being 31 applied. In this way, as explained in more detail below, advantages can be achieved both in 32 terms of production and in terms of use. Firstly, in view of the fact that the inlet openings are 33 still entirely, or at least substantially, closed before pressure is applied, in particular also before 34 the injection spigots are used, protection from damage and soiling is achieved. It is preferably 22016074.1 2 Agent Ref: 76576/00003 I provided that the first and second predetermined breaking points are each formed at a wall 2 region with a reduced wall thickness in comparison with adjacent wall regions. In particular 3 whenever the wall thickness is in this case reduced only to the extent that there is still a wall 4 thickness (albeit perhaps extremely small), that is to say no perforations are provided, production can be simplified. It is considered to be a practical configuration for the housing of 6 the injection spigot to have a substantially rotationally symmetrical, preferably substantially 7 cylindrical, wall, at one of the longitudinal ends of which the outlet opening for exit of the supply 8 components in the direction of the injection anchor is disposed. At the longitudinal end opposite 9 from the outlet opening, the injection spigot may have an end wall on which at least one predetermined breaking point for a first inlet opening is formed. In the case of a preferred 11 embodiment, it is provided that the predetermined breaking point for the first inlet opening is 12 formed at a wall region, preferably of a circular outline, of which the wall thickness decreases 13 from the outside inward, preferably radially symmetrically and in particular linearly in the radial 14 direction. If the wall thickness thereby decreases toward the center point, there is a punctiform predetermined breaking point at which breaking open occurs first as a result of pressurization by 16 a supply component supplied through the first supply line and then, depending on the pressure, 17 further tearing open of the inlet opening may occur. With respect to one or more so-called 18 second inlet openings for the second supply component, it is preferred that one or more 19 predetermined breaking points, preferably two lying opposite each other on the circumference, are formed correspondingly for this on the circumference of the cylindrical wall of the injection 21 spigot.
23 It is preferred in this connection that one or more predetermined breaking points, each for a 24 second inlet opening, are formed at a wall region, preferably of a circular outline, with a wall thickness which is suddenly reduced in comparison with adjacent wall regions and decreases in 26 the longitudinal direction of the injection spigot toward the longitudinal end thereof having the 27 outlet opening, preferably decreasing linearly in this direction. To achieve a wall region with a 28 suddenly reduced wall thickness, a depression that forms as it were a cup may be provided in a 29 wall with a comparatively great wall thickness. The preferred predetermined breaking point is located where there is the smallest wall thickness on account of the geometry chosen. Once 31 this location is broken open, depending on the level of pressurization, progressive formation of a 32 tear may occur, starting from there, in particular along the transition in the wall thickness, in the 33 direction of increasing wall thickness of the thickness-reduced wall region, the form of the tear 34 determining the peripheral contour of the inlet opening. Generally, the progression of the tear is 22016074.1 3 Agent Ref: 76576/00003 1 limited by the pressure subsiding as a result of the already existing tear and a certain deflection 2 of the wall regions around which the tear forms. To this extent, the part of the wall region of 3 reduced wall thickness that has not been torn into at the end assumes a retaining function and, 4 in the case of an elastically deformable material, also assumes so to speak the function of a bending joint at which the wall portion around which the tear forms is articulated like a flap 6 valve. Sufficiently elastic properties have the advantageous effect that the flap valves move 7 resiliently back into their starting position of their own accord when the pressure is switched off, 8 that is to say in particular when the supplying of the supply components is ended at the end of 9 the anchor grouting operation, as a result of which the inlet openings are substantially closed again. In this way, return flow is prevented (as in the case of heart valves), in particular once 11 the injection head has been detached from the injection spigot or connector. Within the scope 12 of the invention, a variation in the wall thickness is possible within wide ranges of values or 13 relative values, both within the wall regions of reduced wall thickness and in relation to the 14 adjacent thicker wall regions. It is preferably provided that, at the wall region of reduced wall thickness at which the predetermined breaking point for the second inlet opening is formed, the 16 maximum wall thickness is a multiple of the minimum wall thickness occurring there, preferably 17 two to four times, and that the maximum wall thickness of this wall region of reduced wall 18 thickness is less than the wall thickness of the wall region surrounding the cup mentioned, 19 preferably approximately half or approximately one third in relation thereto. It is also preferred within the scope of the invention that the injection spigot is produced from plastics material, in 21 particular from polyamide. It is also preferred in this connection that the injection spigot is 22 designed as a plastics injection molding or is produced by the plastics injection-molding 23 process.
It is regarded as a suitable development that the cylindrical wall of the injection spigot has, in 26 the rear region of its length, in the area of the wall regions of reduced wall thickness that are 27 associated with the second inlet openings, a continuous peripheral annular groove on the 28 outside. This allows the flow of the supply component to the inlet openings distributed around 29 the circumference to be made more uniform. In particular if it is produced as a plastics injection molding, this provides the possibility in a simple manner that the cylindrical wall of the injection 31 spigot has, in a front region of the length between the predetermined breaking points for the 32 second inlet openings and the outlet opening, on the outside, one or more annular projections, 33 integrally formed, spaced apart in the longitudinal direction and extending in the circumferential 34 direction. This front region of the length may serve for inserting the injection spigot into the 22016074.1 4 Agent Ref: 76576/00003 I injection channel (in particular in a widening of the channel) of the injection anchor. The terms 2 front and rear, or front end and rear end, relate to the direction of advancement of an anchor 3 during drilling-in. Given diameters that are suitably made to match one another, the ribs 4 undergo a certain deformation during insertion and oppose later withdrawal of the injection spigot or connector from the anchor, so that a desired high axial retaining force can be realized.
6 As an alternative or in combination, there is the possibility that the cylindrical wall of the injection 7 spigot has, on each of both sides of the already mentioned circumferential groove, a raised and 8 integrally formed annular bead running continuously around the circumference. If the diameters 9 are appropriately made to match, the two annular beads undergo a certain deformation during insertion of the injection spigot into a recess provided for this purpose in the injection head or in 11 the rotatable inner part thereof, so that the annular beads act as seals.
13 According to the statements made above, the known flushing nut, in which the two resin 14 components meet for the first time, is replaced by the injection spigot according to the invention, which can be produced at comparatively lower cost. In particular, it may be a ready-to-install 16 polyamide injection molding with ready-integrated seals and flap valves.
For use, the injection 17 spigot is preferably disposed at the end of the injection anchor, that is to say ahead of a static 18 mixer possibly provided therein. In comparison with the conventional flushing nut, it is of 19 advantage that the anchor rod is not screwed into the flushing nut, but instead the injection spigot can be inserted into the anchor rod. The miniaturization of the injection spigot or 21 connector thereby made possible, to this extent achieves a great cost advantage over the 22 known flushing nut, which requires laborious machining. As explained, in the inserted state of 23 the injection spigot or connection piece, the circumferential ribs that are possible in the front 24 region of the length thereof bring about an increase in the axial retaining force, which as a result can be chosen preferably to be greater than the axial retaining force between the inner part of 26 the flushing head and the injection spigot, so that, when the injection anchor is unscrewed from 27 the flushing head, the injection spigot is also automatically and reliably withdrawn axially from 28 the flushing head and can remain as a lost component on the anchor, acting at the same time 29 as a terminal seal. The cost advantage that is possible by the invention is obtained in particular because of the preferred use as a lost part and the numbers of items that are to this extent 31 required.
22016074.1 5 Agent Ref: 76576/00003 I The invention is described in more detail below with reference to the accompanying figures, 2 which show a preferred exemplary embodiment of the injection spigot according to the invention 3 and a preferred use, and in which:
Figure 1 shows a longitudinal section of the injection spigot according to the invention as 6 provided by a first preferred embodiment, in conjunction with an injection head 7 preferred for use, after the grouting of a drilling injection anchor;
9 Figure 2 shows the arrangement shown in Figure 1, but after the detachment of the injection spigot from the injection anchor;
12 Figure 3 shows a sectional view along a section line III-III in Figure 2;
14 Figure 4 shows a longitudinal section along section line IV-IV according to Figure 2;
16 Figure 5 shows a perspective view of the arrangement represented in Figure 2;
18 Figure 6 shows the injection spigot that is shown in Figure 1, inserted into the injection 19 anchor, with the representation shortened by being broken up;
21 Figure 7 shows the injection spigot in an enlargement of detail VII in Figure 1, with inlet 22 openings opened;
24 Figure 8 shows the arrangement shown in Figure 7, but with a new injection spigot with inlet openings still closed;
27 Figure 9 shows the end of the grouted injection anchor that is shown in Figure 1, after the 28 detachment of the injection head from the injection spigot;
Figure 10 shows a perspective view of the injection spigot that is shown in Figure 1, but 31 enlarged in comparison, and 33 Figure 11 shows a longitudinal section of the injection spigot that is shown in Figure 1, 34 likewise enlarged in comparison.
22016074.1 6 Agent Ref: 76576/00003 2 The injection head 1 according to the invention, as provided by a first preferred embodiment, is 3 described with reference to Figures 1 to 10, in conjunction with components interacting 4 therewith. The injection head has a flushing head 2, which comprises an outer housing 3 and an inner part 4, which is accommodated rotatably therein in relation to a longitudinal axis A.
6 Associated with the outer housing 3 is a first flushing ring 5, attached to the outside of which is a 7 first supply connection 6 for supplying a first, preferably liquid, supply component, and a second 8 flushing ring 7, which is kept at a distance axially from the first flushing ring 5 in the longitudinal 9 direction L (i.e. in the direction of the longitudinal axis A) and attached to the outside of which is a second supply connection 8 for the separate supply of a further, preferably liquid, supply 11 component. The inner part 4 has, at the rear end, a connection 9 with a receiving opening 10 12 for receiving in a rotationally form-fitting manner a connecting end 11 of a drilling drive 12, only 13 the front portion of which is indicated by dashed lines. At the front end, the inner part has, as 14 connecting means for the connection of an anchor rod 14 provided with an external anchor thread 13 (cf. also Figure 6), a threaded bore 17 provided with an internal thread 16 matching 16 the anchor thread (cf. also Figures 2 and 4). The threaded bore 17 with the internal thread 16 17 represents to this extent a connecting means for the connection of an anchor rod 14 provided 18 with a corresponding external anchor thread 13. It is noted that only the rearmost anchor rod 14 19 of a drilling injection anchor 15 is respectively represented in the figures, but, in a way known per se, said anchor may, if required, also have a number of anchor rods connected for example 21 by threaded coupling nuts, and in particular a drill bit at the tip. As Figures 1, 7 and 8 22 particularly show, the rotatable inner part 4 has inside it a first supply line 18, which is 23 connected to the first supply connection 6, and four second supply lines 19, which are spaced 24 apart around the circumference each by a quarter turn and are connected to the second supply connection 8. The first supply line is formed by a bore 20 running centrally in the longitudinal 26 direction L and two radial bores 21 running radially from the rear end thereof to the surface.
27 The first and second supply lines 18, 19 are directed in the direction of a line connection 22 28 shared by them in the inner cavity 23 of an injection spigot 24. The latter is inserted (cf. Figures 29 7 and 8), with the rear region 25 of its length, into a recess 26, which is disposed in axial extension of the threaded bore 17, is of reduced cross-section in comparison with the latter and 31 is substantially cylindrical, and inserted in the region of the front portion 27 of its length in a 32 force-fitting manner into a widening 28 of the injection channel 29 of the anchor rod 14 that is 33 screwed into the threaded bore 17. A supply line for a desired first supply component may be 34 connected to the first supply connection 6 and this first supply component supplied to the 22016074.1 7 Agent Ref: 76576/00003 ? injection spigot 24 through the annular groove 31 in the first flushing ring 5, the first supply line 2 18 and a sprung nonreturn valve 30, which is disposed at the end of the line and opens when 3 there is sufficient supply pressure. A supply line for a further desired supply component may be 4 connected to the second supply connection 8 and this further supply component supplied to the injection spigot 24 separately from the first supply component, through the annular groove 33 in 6 the second flushing ring 7, through the second supply lines 19 and through the sprung 7 nonreturn valves 32, which open when there is sufficient supply pressure. As Figure 8 shows, 8 the housing 34 of the injection spigot 24 has a prepared first predetermined breaking point 35 9 for forming a first inlet opening 36 (cf. Figure 7) for the first supply component and, at a distance from this breaking point, two second predetermined breaking points 37 each for forming a 11 second inlet opening 38 (cf. Figure 7). Said predetermined breaking points are respectively 12 formed at a wall region 39, 40 with a reduced wall thickness in comparison with adjacent wall 13 regions and are located there, in the region of the smallest wall thickness in each case. The 14 term predetermined breaking point should be understood in a broad sense here and geometrically includes the possibility of a punctiform, linear or two-dimensional extent. If, as 16 represented in Figure 8, a new injection spigot is used, its predetermined breaking points are 17 initially not yet broken, i.e. the associated inlet openings 36, 38 are still closed. With regard to 18 their shaping and dimensioning (in particular with regard to the minimum wall thickness chosen), 19 the predetermined breaking points 35, 37 are in each case made to match the supply pressures for the supply components that can usually be set during the operation of the injection head, in 21 such a way that they break open under suitable pressurization, as represented in Figure 7, so 22 that the respective inlet opening 36, 38 is opened and the supply component, which is in each 23 case still separate there, flows into the inner cavity 23. Only in this cavity 23, i.e. at the line 24 connection 22, do the two separately supplied components (for example resin and catalyst) come into contact. As Figure 11 illustrates in particular, the inner cavity 23 has an outlet 26 opening 41 for the joint exit of the first and second supply components in the direction of the 27 drilling injection anchor 15.
29 As mentioned above, Figure 1 shows the injection head 1 after a drilling injection anchor 15 (only partially represented) has been drilled into a wall 44 (for example of rock) and after the 31 drilling injection anchor 15 has been grouted in the formed drill hole 45 by means of a grouting 32 compound 46, which has been formed by mixing the two supply components supplied through 33 the supply connections 6, 8 and has then set in the drill hole. As a result of the anchor thread 34 13 and the unevennesses in the wall of the drill hole, an effective axial shearing bond is formed 22016074.1 8 Agent Ref: 76576/00003 I by'the grouting compound 46 that has hardened out a short time after mixing.
For better 2 representation of details, in Figure 1 the grouting compound 46 is shown only in the drill hole 45, 3 i.e. not in the flushing head and the drilling injection anchor. In Figure 1, the drilling injection 4 anchor 15 has been drilled into the wall to a desired depth, at which a supporting plate 47 (so-called collar plate) is pressed against a lagging mat 49, provided in front of the wall 44, by a ball 6 seat nut 48, which is screwed on by means of an internal thread until it comes to an axial stop 7 against the rotatable inner part 4.
9 According to a method according to the invention, which is preferred in particular with regard to the use shown in Figure 1, it is regarded as suitable that, in preparation for a drilling operation, 11 first the preassembled unit comprising at least one anchor rod 14 and an injection spigot 24 that 12 is represented in Figure 6 is brought to the flushing head that is shown in Figures 2 to 5 and is 13 connected to it. To produce this unit, first of all a first so-called static mixer 50, which is known 14 per se and has a multiplicity of so-called chicanes 51 of helical form disposed one behind the other in the longitudinal direction L, is pushed into the injection channel 29 with a surrounding, in 16 particular separate, enclosing element 52, which may be, for example, a pipe or a flexible tube, 17 and axially fixed therein with the enclosing element 51, in a suitable way, so that it forms an 18 axially fixed barrier to the flow pressure of the supply components in the injection channel 29 19 that can be flowed through by the different supply components, which, as they flow through, undergo intensive mixing. In the exemplary embodiment chosen, the injection spigot 24 21 represented in detail in Figure 11 was subsequently inserted with the front region 27 of its 22 length, at the end face of which there is the outlet opening 41, into a channel widening 28 of the 23 anchor rod 14 adjacent the static mixer 50. In this case, on account of the matched diameters, 24 the region 27 of the length with the cylindrically machined channel widening 28 forms a first insert-press connection 53, which can only be separated again if a relatively high, so-called first 26 axial force is applied. The outer side of the injection spigot 24, which in the example is 27 rotationally symmetrical and substantially cylindrical, forms at the transition from the rear region 28 25 of the length to the front region 27 of the length, by a sudden reduction in cross-section, an 29 axial stop face 54, which forms an axial stop with the end face 55 of the anchor rod 14. The inner cavity 23 is of a substantially cylindrical form. In it, a second static mixer 56 has been 31 fitted and pushed against a rear-end axial stop, formed by an annular step 73 in the cavity 23.
32 In this respect, the terms rear end and front end (or rear and front) again relate to the direction 33 of advancement of the anchor rod during drilling-in. In this way, the second static mixer 56 is 34 fixed in the longitudinal direction L, apart from a small freedom of movement permissible in the 22016074.1 9 Agent Ref: 76576/00003 T example, without a connection to the injection spigot 24 at its circumference being necessary 2 (even though such a connection would be additionally possible). While the annular stage 73 3 forms the rearward axial stop, a forward displacement is prevented by the axially fixed static 4 mixer 50. For automated drilling and grouting operation, the unit shown in Figure 6 may be preassembled in relatively large numbers and preferably fed to the arrangement shown in 6 Figures 2 to 5 particularly while loaded in a magazine. For connection to the injection head 1, 7 the anchor rod 14 preassembled with the injection spigot 24 is screwed by means of its anchor 8 thread 13 into the threaded bore 17 of the rotatable inner part 4, until this is not possible any 9 further (as indicated in Figure 8) at the end of the inner thread 16 or at an axial stop (the latter may lie at the rear end of the injection spigot 24). In this case, the injection spigot 24 is pushed, 11 with the rear region 25 of its length, into the substantially cylindrical recess 26 (cf. Figure 2) in 12 the longitudinal direction. The shaping or dimensioning is chosen such that the rear end face 58 13 (cf. Figure 11) of the injection spigot 24, at which the first predetermined breaking point 35 for 14 the first inlet opening 36 is located, comes to lie axially against a pressing bush 62, which has been inserted into the inner part 4, and the sprung nonreturn valve 30, which has been axially 16 fixed in the center channel of the bush. In this way, front-end and rear-end axial fixing of the 17 injection spigot 24 is also achieved. In this position, which is shown enlarged in Figures 7 and 18 8, moreover, suitable positioning of the second inlet openings 38 (or of the second 19 predetermined breaking points 37) in the longitudinal direction L in relation to the outlet end of the second supply lines 19, or the sprung nonreturn valves 32 axially held therein, is also 21 ensured. As shown in the figures, on the cylindrical wall 59 of the injection spigot 24, at the 22 axial position of the wall regions 40 of reduced wall thickness, there is a peripheral annular 23 groove 60 on the outside, which is axially in line with the supply lines 19. The rear region 25 of 24 the length of the injection spigot 24 forms, with the recess 26 in the inner part 4, a second insert-press connection 61, the so-called second axial force that can be transferred by this 26 connection 61 being less than the first axial force that can be transferred by the first insert-press 27 connection 53. If the injection head 24 or its rotatable inner part 4 is later unscrewed from the 28 anchor rod 14 (preferably by reversing the direction of rotation on the drilling drive), the axial 29 forces of different magnitude that can be transferred by the two insert-press connections 53, 61 have the effect that the injection spigot 24 is automatically withdrawn from the inner part 4 and 31 can remain as a lost part at the end of the injection drilling anchor.
Starting from the installation 32 state shown in Figure 8, in which the first and second predetermined breaking points 35, 37 are 33 not yet broken, i.e. the first and second inlet openings 36, 38 are still closed, in order to arrive at 34 the state shown in Figure 7 (corresponding to Figure 1), the respective individual supply 22016074.1 10 Agent Ref: 76576/00003 I component is supplied under pressure through the supply connections 6, 8, whereby the sprung 2 nonreturn valves 30, 32 open, the respective supply components press against the wall regions 3 39, 40 of reduced wall thickness and finally break the predetermined breaking points 35, 37, so 4 that the inlet openings 36, 38 are opened up. In the example chosen, the injection spigot 24 is a component produced in one piece from the plastics material polyamide by the injection-molding 6 process.
8 A further special feature of the injection head shown as an exemplary embodiment is that on it 9 there is a releasable coupling securement for the torque-transferring connecting end 11 of the drilling drive 12. As Figures 3 and 4 illustrate in particular, this is brought about by two securing 11 elements 64, which in the example are pins 65, and by the inner part 4 having, in a cross-12 section Q running perpendicularly to the longitudinal direction L at the receiving opening 10, two 13 parallel spaced-apart through-bores 66, which serve as mounting openings 68 for the pins, 14 these being adapted in their diameter for releasable clamping fastening of the pins. Suitable pins are commercially available and known with regard to the general way in which they 16 function. The lateral spacing a between the through-bores 66 is chosen to be less than the 17 diameter D of the adjacent portion 67 of the length of the receiving opening 10. This means 18 that, in the fastening or clamping state of the pins 65, the cross-section of the receiving opening 19 10 is reduced in comparison with the state without pins 65. In the exemplary embodiment, the drilling drive 12 chosen is one in which the connecting end 11 has, at a distance behind its 21 connecting portion 69, a projection 70 which runs in the form of a ring around the circumference 22 and the diameter of which substantially corresponds to the diameter D. The releasable securing 23 elements 64 make the projection 70 act like a securing projection with the effect of a form fit, 24 which, in the direction of a longitudinal projection (along the longitudinal direction L), radially overlaps the securing elements 64 in the fitted state and thereby forms a releasable separating 26 securement with a form fit in the longitudinal direction L when the drilling drive connecting end 27 11 is connected. In the example shown, the connecting portion 69 of the drilling drive 28 connecting end 11, reaching as far the front free longitudinal end, is provided, for torque 29 transfer, with an external thread 71, which matches an internal thread 72 provided in a portion of the length of the receiving opening 10. The aforementioned features achieve the effect that, 31 when the direction of rotation of the drilling drive 12 is reversed for separation from the drilling 32 injection anchor 15, the inner part 4 cannot become unscrewed from the drilling drive 33 connecting end 11, so that constant torque transfer is ensured, and with it reliable operation.
34 Detachment of the drilling drive 12 from the flushing head 2 is only made possible by the pins 65 22016074.1 11 Agent Ref: 76576/00003 T bofh being removed from the bores 66 by a manipulation - one generally familiar to the person 2 skilled in the art. The pins 65 are selected such that they withstand the centrifugal forces 3 occurring during operation and the percussive stress during drilling.
Further special features of the preferred embodiment, shown by way of example, of the injection 6 spigot according to the invention are explained in more detail below with reference to Figures 6 7 to 11. Figure 10 in particular clearly shows that the injection spigot is formed as a substantially 8 rotationally symmetrical sleeve part. It is shown in conjunction with Figure 11 that the 9 predetermined breaking point 35 for the first inlet opening 36 (cf. Figure 7) is formed on the rear end wall 58 at a wall region 39 which to this extent is circular and the wall thickness of which 11 decreases from the outside inward in a radially symmetrical linear manner to a small fraction of 12 the peripheral wall thickness. At the predetermined breaking point 35, the wall thickness may 13 be reduced in particular down to a membrane- or film-like residual thickness, so that tearing 14 open occurs even under comparatively low pressurization. Figure 7 shows the first inlet opening 36, which is thereby formed on the assumption that tear lines in the wall 39 radiate out 16 from the predetermined breaking point 35 in the form of a star and through which the first supply 17 component, supplied through the first supply line 18, is supplied into the inner cavity 23.
18 Although Figure 1 shows the state after the grouting of the injection anchor, the enlargement 19 according to Figure 7 still shows for purposes of illustration the open position of the inlet openings 36, 38, which then goes over resiliently into a closed position of the wall portions.
21 Correspondingly, on account of the elastic property of the plastics material used, Figure 9 22 shows that the wall regions 39, 40 of reduced wall thickness are deformed back again of their 23 own accord after the unscrewing of the flushing head, so that the inlet openings 36, 38 are 24 substantially closed again. However, to present a clear overview in Figure 9 also, the injection spigot 24 and the drilling injection anchor 15 are shown without the grouting compound 46 26 inside that is still present there. Figures 10 and 11 also reveal that the two predetermined 27 breaking points 37 lying opposite each other at the circumference, each for a second inlet 28 opening 38 (cf. Figure 7), respectively lie at a wall region 40 which has a circular outline and a 29 suddenly reduced wall thickness in comparison with adjacent wall regions.
While the inner wall of the cavity 23 runs in a cylindrical manner, the outer side of the wall regions 40 is of a planar 31 form and thereby runs at an acute angle with respect to the longitudinal direction L. Each wall 32 region 40 to this extent forms an inclined planar base of a cup-like depression formed in the 33 housing wall axially level with the annular groove 60. The shaping described has the effect of 34 pre-setting the position of the predetermined breaking point 37 at the location of least wall 22016074.1 12 Agent Ref: 76576/00003 I thickness. This is the point of intersection of the circular peripheral line of wall region 40 with 2 the sectional plane of Figure 11 that lies facing the front region 27 of the length or the outlet 3 opening 41. The terms front end and rear end or front and rear relate here, as before, to the 4 direction of advancement during the drilling-in of the anchor.
6 After the tearing-open of the predetermined breaking point 37, pressurization causes tearing to 7 continue from there along part of the circular peripheral line of wall region 40. As Figure 7 8 shows in this respect, the outlined portion of the wall region 40 is inwardly deflected by the 9 pressurization and forms so to speak a flap valve with a valve flap 76, which is articulated at a bending joint 77. The latter is formed by part of the wall region 40 that has not been reached by 11 the tear on account of its greater wall thickness in comparison with the predetermined breaking 12 point 37. Figures 10 and 11 also show that the cylindrical wall 59 in the front region 27 of the 13 length between the predetermined breaking points 37 and the outlet opening 41 has on the 14 outside a multiplicity of annular projections or ribs 63 spaced apart in the longitudinal direction L.
Provided on each of both sides of the circumferential groove 60 on the cylindrical wall 59 is a 16 raised and integrally formed annular bead 78, running around the circumference in the form of a 17 ring, to seal the annular groove 60.
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.
22016074.1 13
Claims (17)
1. Injection spigot, in particular for an injection head for injection drilling anchors which is suitable for separately supplying at least a first and a second supply component, the injection spigot having a housing which forms an inner cavity that has at least one outlet opening for exit of the first and second supply components, characterized in that the wall of the housing (34) has at least one first predetermined breaking point (35) for forming a first inlet opening (36) for a first pressurized supply component and, at a distance from it, at least one second predetermined breaking point (37) for forming a second inlet opening (38) for a second pressurized supply component.
2. Injection spigot according to Claim 1 or in particular according thereto, characterized in that the first and second predetermined breaking points (35, 37) are each formed at a wall region (39, 40) of reduced wall thickness in comparison with adjacent wall regions.
3. Injection spigot according to one or more of the preceding claims or in particular according thereto, characterized in that the housing (34) of the injection spigot (24) has a substantially rotationally symmetrical, in particular substantially cylindrical, wall, at the one longitudinal end of which the outlet opening (41) is disposed.
4. Injection spigot according to one or more of the preceding claims or in particular according thereto, characterized in that the injection spigot (24) has, at the longitudinal end opposite from the outlet opening (41), an end wall (58) on which the predetermined breaking point (35) for the first inlet opening (36) is formed.
5. Injection spigot according to one or more of the preceding claims or in particular according thereto, characterized in that the predetermined breaking point (35) for the first inlet opening (36) is formed at a wall region (39), in particular of a circular outline, of which the wall thickness decreases from the outside inward, in particular radially symmetrically and/or linearly.
6. Injection spigot according to one or more of the preceding claims or in particular according thereto, characterized in that one or more predetermined breaking points (37), in particular two lying opposite each other on the circumference, each for a second inlet opening (38), are formed on the circumference of the cylindrical wall (59) of the injection spigot (24).
7. Injection spigot according to one or more of the preceding claims or in particular according thereto, characterized in that one or more predetermined breaking points (37), each for a second inlet opening (38), are formed at a wall region (40), in particular of a circular outline, with a wall thickness which is suddenly reduced in comparison with adjacent wall regions and decreases in the longitudinal direction (L) of the injection spigot (24) toward the longitudinal end thereof having the outlet opening (41), and in particular decreasing linearly in this direction.
8. Injection spigot according to one or more of the preceding claims or in particular according thereto, characterized in that, at the wall region (40) of reduced wall thickness at which the predetermined breaking point (37) for the second predetermined breaking point (38) is formed, the maximum wall thickness is a multiple of the minimum wall thickness, in particular two to four times, and in that the maximum wall thickness of this wall region (40) of reduced wall thickness is less than the wall thickness of the surrounding wall region, in particular approximately half or approximately one third in relation thereto.
9. Injection spigot according to one or more of the preceding claims or in particular according thereto, characterized in that the injection spigot (24) is produced from plastics material, in particular from polyamide.
10. Injection spigot according to one or more of the preceding claims or in particular according thereto, characterized in that the injection spigot (24) is produced by the plastics injection-molding process.
11. Injection spigot according to one or more of the preceding claims or in particular according thereto, characterized in that the cylindrical wall (59) has, in a rear region (25) of the length, in the area of the wall regions (40) of reduced wall thickness for the second inlet openings (38), a peripheral annular groove (60) on the outside.
12. Injection spigot according to one or more of the preceding claims or in particular according thereto, characterized in that the cylindrical wall (59) has, in a front region (27) of the length between the predetermined breaking points (37) for the second inlet opening (38) and the outlet opening (41), on the outside, one or more ribs (63), integrally formed, spaced apart in the longitudinal direction (L) and extending in the circumferential direction.
13. Injection spigot according to one or more of the preceding claims or in particular according thereto, characterized in that the cylindrical wall (59) has, on each of both sides of the circumferential groove (60), a raised and integrally formed annular bead (78) running around the circumference.
14. Injection spigot according to one or more of the preceding claims or in particular according thereto, characterized in that the cylindrical wall (59) has, at the transition from the rear region (25) of the length to the front region (27) of the length, a sudden reduction in cross-section, thereby forming an axial stop face (54).
15. Injection spigot according to one or more of the preceding claims or in particular according thereto, characterized in that the inner cavity (23) is of a substantially cylindrical form and in it a static mixer (56) is pushed in against an axial stop (57)
16. Injection spigot according to one or more of the preceding claims or in particular according thereto, characterized in that, in its installation state, the injection spigot (24) is inserted, in the front region (27) of the length having the annular projections, in the longitudinal direction (L) into the injection channel (29) of an anchor rod (14) or into a widening (28) of the injection channel (29), with a force fit.
17. Injection head for drilling in and grouting drilling injection anchors, characterized in that an injection spigot according to one or more of the preceding claims is fitted in the injection head.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008006233.2 | 2008-01-25 | ||
| DE200810006233 DE102008006233A1 (en) | 2008-01-25 | 2008-01-25 | injection port |
| PCT/EP2009/050172 WO2009092632A1 (en) | 2008-01-25 | 2009-01-08 | Injection spigot |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2713194A1 true CA2713194A1 (en) | 2009-07-30 |
Family
ID=40637885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2713194A Abandoned CA2713194A1 (en) | 2008-01-25 | 2009-01-08 | Injection spigot |
Country Status (6)
| Country | Link |
|---|---|
| CN (1) | CN101925720B (en) |
| AU (1) | AU2009207740A1 (en) |
| CA (1) | CA2713194A1 (en) |
| DE (1) | DE102008006233A1 (en) |
| WO (1) | WO2009092632A1 (en) |
| ZA (1) | ZA201004523B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020247987A1 (en) * | 2019-06-06 | 2020-12-10 | Epiroc Holdings South Africa (Pty) Ltd | Nozzle for use in introducing a multi-component adhesive into a rock anchor installation |
| WO2021232073A1 (en) * | 2020-05-12 | 2021-11-18 | Innovative Mining Products (Pty) Ltd | Two-part resin input nozzle |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1027304B1 (en) * | 2019-05-21 | 2020-12-22 | Geotech Bvba | GROUND ANCHOR |
| US11674390B2 (en) | 2019-11-22 | 2023-06-13 | Innovative Mining Products (Pty) Ltd | Resin-grouted rock bolt assembly with an adapted sealing bush |
| WO2021102485A1 (en) * | 2019-11-22 | 2021-05-27 | Innovative Mining Products (Pty) Ltd | Resin-grouted rock bolt assembly with an adapted sealing bush |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6530437B2 (en) * | 2000-06-08 | 2003-03-11 | Maurer Technology Incorporated | Multi-gradient drilling method and system |
| CN2453103Y (en) * | 2000-12-12 | 2001-10-10 | 中国石油集团地球物理勘探局 | Mountain area drilling machine |
| AUPR901601A0 (en) * | 2001-11-23 | 2001-12-13 | Celtite Pty Ltd | Improvements in rock bolting |
| US20070264088A1 (en) * | 2004-10-21 | 2007-11-15 | Archibald Richter | Method for Embedding Rock Anchors |
| DE102007008966A1 (en) | 2006-02-24 | 2007-09-06 | Friedr. Ischebeck Gmbh | Injection head for injection drilling anchors, has sink head, inclusive of outer part having two different supply connections, and inner part with rear connection for drilling drive and front connection for anchoring ring |
| DE102007005540B4 (en) * | 2006-02-24 | 2015-04-23 | Friedr. Ischebeck Gmbh | Method and injection anchor with fixed static mixer |
| CN2900755Y (en) * | 2006-05-25 | 2007-05-16 | 李阳 | Drill bit suitable for anchor rod and anchor cable |
-
2008
- 2008-01-25 DE DE200810006233 patent/DE102008006233A1/en not_active Withdrawn
-
2009
- 2009-01-08 AU AU2009207740A patent/AU2009207740A1/en not_active Abandoned
- 2009-01-08 CN CN200980103100.4A patent/CN101925720B/en not_active Expired - Fee Related
- 2009-01-08 WO PCT/EP2009/050172 patent/WO2009092632A1/en active Application Filing
- 2009-01-08 CA CA2713194A patent/CA2713194A1/en not_active Abandoned
-
2010
- 2010-06-25 ZA ZA2010/04523A patent/ZA201004523B/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020247987A1 (en) * | 2019-06-06 | 2020-12-10 | Epiroc Holdings South Africa (Pty) Ltd | Nozzle for use in introducing a multi-component adhesive into a rock anchor installation |
| WO2021232073A1 (en) * | 2020-05-12 | 2021-11-18 | Innovative Mining Products (Pty) Ltd | Two-part resin input nozzle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101925720B (en) | 2013-02-06 |
| CN101925720A (en) | 2010-12-22 |
| WO2009092632A1 (en) | 2009-07-30 |
| ZA201004523B (en) | 2011-09-28 |
| DE102008006233A1 (en) | 2009-07-30 |
| AU2009207740A1 (en) | 2009-07-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |
Effective date: 20150108 |