Tubular construction for the production of a rock anchor and/or for the conveying of fluid

(42) Date of commencement of the patent: 15. 8.1991 (45) Date of issue: 25. 2.1992 (30)

Priority:

13th 1.1986 HU 154/86 claims. (56) Documents:

AT-PS 295414 CH-PS 568471 DE-0S3111673 EP-A1 16742 EP-A-147727 GB-PS1586550 US-PS4100748 (73)

Patentee:

MAGYAR ALUMINUMIPARI TRAPS H-1133 BUDAPEST (HU).

(72) Inventor:

FAZEKAS JANOS DIPL.ING. DR. TAPOLCA (HU).

QRBAN TIBQR DIPL.ING. TAPOLCA (HU).

GADORX VILMOS DIPL.ING. TAPOLCA (HU).

KRALIK GYULA DIPL.ING. DUNAUVAROS (HU).

HORVATH FERENC DIPL.ING. TAPOLCA (HU).

KERENYI BELA DIPL.ING. BUDAPEST (HU).

HEGYI ZOLTAN DIPL.ING. DUNAUVAROS (HU).

(54) PIPE CONSTRUCTION FOR THE PRODUCTION OF A REST ANCHOR AND / OR LIQUID PROMOTION

CQ (57) Pipe construction for the production of a rock anchor with a coupling element, in which a passage opening (6) opens into the interior of the tube (2), wherein the coupling element is designed as a coupling pin (20) and is provided on the outside with a thread (5) and attached to it another, provided at one end with an internal thread (9) located in a coupling sleeve (30, 30a) which can be screwed to the coupling pin (20), connected to the tube (2) via a through-opening (6,18) communicating pipe construction member (II, III), wherein any number of pipe construction members can be coupled via further coupling pin coupling sleeve connections prior to introduction into the wellbore.

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AT 394 248 fflH 0078MS

AT 394 248 B

The invention relates to a pipe construction consisting of several Rohrkonstruktionsgliedem for producing a rock bolt and / or for conveying liquids, one containing an invagination, having a fluid pressure deformable wall, wherein the first pipe construction member is provided at one end with a closure element, in which a passage opening opens into the interior of the tube, in particular for the extension of roads in pits or for securing other underground spaces, for the attachment of constructions customary in pits or civil engineering (tunneling), objects for dewatering pit water present in cavities, and for injecting a post-curing liquid into cracked rocks.

In the field of mining or In tunnel construction, numerous versions for stone anchors are known. Thus, there are stone anchors, which include a rod as a load-bearing structural element, as described in GB-PS 1 586 550. The AT-PS 295 414 describes a pipe construction, which after introduction into a bore detergent and binder, for. B. Cement mortar, contributes. After subsequent extraction of the tube remains only the drill bit and the drill string in the borehole. The subject of No. 16 Publish 742 EP application is one of the most up-to-date solutions and concerns a pipe anchor, as it is also known from DE-OS 3 111 673, with closed profile, wherein high-pressure liquid is introduced, whereby the cross-sectional area of ​​the tube is thus enlarged, in that between the outer wall of the pipe anchor and the rock to be covered, a frictional connection enabling the loading capacity of the anchor comes about. In its state preceding the extension, the pipe anchor has at least one, longitudinally extending indentation, which is expressed plastically under the effect of the hydraulic pressure of the liquid introduced, after which the jacket of the pipe anchor rests against the wall of the predrilled hole and is clamped and adapted to the unevenness. The fluid pressure is provided by an external auxiliary device. The diameter of the pre-drilled hole in the rock must be so large that the pipe anchor can be inserted into the hole without difficulty. The raw material of the pipe anchor is steel of medium toughness, which plastically deforms at a liquid pressure of 100 - 300 bar. The one end of the armature is provided with a filling head suitable for supplying the liquid, the other end provided with a fastening sleeve for preventing the tearing of the armature.

The above-described pipe anchor can be made in the dimensional range between 1 and 3 m in several dimensions, but it often happens that anchors must be installed with a length above, but due to the difficulty and complexity of the assembly of the individual anchor parts only cumbersome and with a high expenditure of time and work can be realized.

Another disadvantage of the discussed pipe anchor is that they are unsuitable for draining the existing in the rock cavities or in the cracked rock mine water, moreover, no post-curing liquid, eg. As cement milk, are introduced into the cracked rock, with which the rock could be solidified.

Another disadvantageous factor is that the filling head of the armature can not be embedded in the track wall or in the sole part of the track, ie there is no possibility of functioning as a recessed anchor, which greatly limits the use of the rubber wheel transport means

The object of the invention was to develop a pipe construction which, when expanded with hydraulic pressure, is largely loadable as a rock bolt thanks to the frictional engagement with the surrounding rock, their rock-solidification-strengthening effectiveness is extremely high, whose construction can be easily and quickly extended, so that it can be produced within practical limits in any length, the application does not depend on the quality of the rock, the structure can be solidified in normal or recessed design and the construction is well suited for removing the water from the rock and for injecting a post-hardening liquid into the rock

The invention is based on the knowledge that, if the fluid pressure deformable, a tube elements containing a collapse are connected to one another via coupling sleeves and coupling bolts, have the openings in the interior opening into the tubular elements, the mutual connection of the pipe construction parts can be solved very easily wherein from the pipe construction members anchors can be made in any length; Moreover, the anchors can also be used for fluid delivery.

On the basis of this finding, the stated object was achieved according to the invention with the aid of a pipe construction, which is characterized that the bolt is designed as a coupling bolt and is provided on the outside with a thread and that there is another, at one end with an internal thread provided in a coupling sleeve which can be screwed to the coupling pin, connects to the pipe via a through hole communicating pipe construction member, wherein any number of pipe construction members before coupling into the borehole can be coupled via further coupling bolt coupling sleeve connections.

It is expedient if at the one end of the pipe construction an internally threaded, with _f provided at the other end with a liquid-containing opening containing sleeve closed pipe construction member is provided, the other, if at one end of a pipe construction adapter is provided, the one communicating via the through hole, communicating via the through hole, via a screwed with the coupling pin coupling sleeve , screwed to the coupling pin,

-2AT 394 248 B designed with female threaded coupling sleeve, while at the other end an intermediate piece is present, which has a screwed with the coupling sleeve of the pipe construction member coupling pin, wherein in the coupling pin and in the coupling sleeve opening into the pipe interior passage opening extends.

According to a further characteristic of the invention, the coupling sleeve (s) and the coupling pin (s) have (through) passage openings with the same cross section and diameter.

A further advantageous embodiment of the pipe construction can be characterized that the coupling pin has a shoulder, whose diameter corresponds to the part with the largest diameter of the pipe, and protruding from the shoulder a neck part with a smaller diameter and on the outside of the neck part a thread is configured, Furthermore, the neck part and the shoulder traversing, in the pipe interior opening through opening is concentric with the running in the length of the geometric center axis.

It is also advantageous if the inner diameter of the threaded thread test of the coupling sleeve (s) has an internal thread, whose outer diameter coincides with the largest outer diameter of the tube, greater than the diameter of the through-hole connecting the thread test to the interior of the pipe, the thread test has a shoulder inside, to the end wall of which a gasket adapts and the passage (s) formed in the coupling sleeve (s) extend with the lengthwise, geometric center axis of the pipe construction is concentric.

In a further advantageous embodiment, the tube adjacent to the coupling sleeve and / or the coupling pin is enclosed with a reinforcing sleeve, which enclosed on the tube and the coupling sleeve, which on the tube and the coupling sleeve or the coupling pin, for. B. with a weld - is also attached.

According to a further characteristic of the invention, the pipe construction is provided with a filling means with filling tube; one end of the filling tube is connected to a filling sleeve, which can be bolted to the coupling pin, has a threaded shouldered test and includes a gasket conforming to the face of the shoulder; the thread test is connected to the interior of the filling tube via a passage opening, while the other end of the filling tube is closed with a pressure-resistant closure disk and enclosed from the outside with a cylindrical sleeve, being in the region of the end of the filling tube, which is enclosed with the sleeve - and advantageously with the spacer ring arranged between the sleeve and the filling tube - the filling opening opens. In this case, it is advantageous to make the inner diameter of the filling tube larger than the diameter of the passage opening, and to arrange the filling tube, the thread test and the passage opening concentrically to the longitudinal axis of the tube device.

Finally, according to another embodiment, the tube (s) of the tube construction will be made of steel material of medium toughness, which under the effect of a fluid pressure of about 100.degree .. 300 bar is able to plastically deform (expand) while the coupling sleeve (s) and / or the coupling pin (s) are equally made of steel; the tubes and the coupling elements, as well as the reinforcing and closing elements are fastened to each other with welds

The invention will be explained in more detail with reference to the accompanying drawings, which illustrate some advantageous embodiments of the pipe construction and the most important structural details. Show: 1 partly in axial section, partly in side view, the pipe construction according to the invention, which works as a sunken anchor, Fig. 2 the cross section along the line (AA) in Fig. 1, Fig. 3 a normal, usable in the design of an outstanding rock anchor from the rock wall element in one of FIG. 1 corresponding representation, Fig. 4 an extension piece usable for extension, partly in axial section, partly in side view, 5 the axial section of a coupling sleeve in a larger scale, Fig. 6 the axial section of a coupling pin in a larger scale, Fig. 7 a filler for filling the construction of FIG. 1 with a liquid, shown in axial section.

As shown in FIGS. 1 and Figure 2 shows, the tube (2) of the tube construction designated in its entirety by the reference number (I) contains the indentation (1). In Fig. 1 is the running in the length, geometric center axis of the tube (2) with (χ). The one - in the installed position of the tube (2) inside the rocky end - the closure element (11) is connected, which is designed as a closure sleeve and the tube (2) fitting the inner end of the tube (2) closes. The closure element (11) is attached to the tube (2) with the weld (31). The other end of the tube (2), the coupling pin (20) with the weld (15) is connected; the coupling pin (20) has a neck (4), an outstanding shoulder (16), and a concentric with the geometric axis (x), the neck (4) and the shoulder (16) equally traversing, in the tube (2 ) opening through opening (6) (bore) on, furthermore, on the outer surface of the neck (4) a screw thread (5) configured. The inner diameter of the opening (6) is smaller than the inner diameter of the raw (2). At the shoulder (16) is a, the outer end of the tube (2) enclosing and tight-fitting reinforcing sleeve (3) - also attached to the weld (15) - which additionally a connection between the reinforcing sleeve (3) and the tube (2 ). The final weld (21) is assigned the task to prevent the leakage of the hydraulic fluid from the interior of the tube (2).

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The in Fig. 3 in the entirety with the reference number (II) designated pipe construction member also has a tube (2) with the indentation (1), the tube (2) corresponds to that of FIG. 1 and 2. At one end of the pipe (2) of the pipe construction member (II), the coupling sleeve (30) by means of the weld (17) is attached. In the inwardly projecting shoulder (19) of the coupling sleeve (30) has a, with the geometric axis (x) concentric, in the tube (2) opening through opening (18) (bore) is present. This opening (18) emerges from the thread test (8) of the coupling sleeve (30), on the inner surface of the thread (9) is configured. In the thread test (8) sits the shoulder (19) snug seal (10) (sealing ring). Suitably, the diameter of the opening (18) with the diameter of the opening (6) of the coupling pin (20) of the pipe construction (I) of FIG. 1 identical. The region of the tube (2) adjacent to the coupling sleeve (30) is enclosed by the reinforcing sleeve (7) which is fastened to the coupling sleeve (30) by the weld seam (17). Again, the final weld (21) is assigned the task of preventing the leakage of hydraulic fluid from the interior of the tube (2).

At the other end of the pipe construction (Π) - as is apparent from Fig. 3 - the actuating head (12) is configured by a, on the end of the tube (2) listed and there with the weld (32) attached to the closure sleeve (32). 41) is formed. The closure sleeve (41) and the wall of the tube (2) passing through the opening (13) serves to feed the pressure medium into the interior of the tube (2).

4, the intermediate piece of the pipe construction (III) is shown, the pipe construction (III) has a with the invagination (1) ausgestaltetes tube (2), at one end of which a matching with that of FIG. 1 coupling pin (20). , at the other end a matching with that of FIG. 3 coupling sleeve (30) is arranged.

The structural elements already explained in connection with FIGS. 1 and 3 are designated by the already used reference numbers

From the larger scale Figs. 5 and 6, it will be appreciated that the diameter (i.e.₂) of the through hole (6) of the coupling pin (20) with the diameter (d₂) of the passage opening (18) of the coupling sleeves (30), matches; z. B. These holes can be designed with a 5 mm diameter. The largest outer diameter (D) of the coupling sleeves (30) is identical to the largest diameter (D) of the coupling pin (20), furthermore, the diameter (dj) are consistent, which in the case of the coupling pin (20) the part without the thread ( 5) of the neck (4), in the case of the coupling sleeve (30) denote the diameter of the thread test (8) without the thread. It is obvious that the coupling sleeves (30) can be screwed onto the coupling pin (20), whereby partially mechanical, load-bearing connections between the elements coupled in this way, on the other hand, the free flow of the liquid, for. B. Pressure fluid (working fluid), or the Injizierungsflüssigkeit, or the drained rock water between the coupled elements through which openings (6 and 18) ensured.

In Fig. 7 the axial section of the filler (14) is illustrated. To one end of the filling tube (22), the filling sleeve (30a), which is identical to the coupling sleeve (30), attached to the weld (23), for ease of identification, we have for the designation of the parts in Fig. 2, 3 and 5 already used Referenznummem the other end of the filling tube (22) are associated with the spacer ring (25) and the sleeve from the outside thereof snugly (27). The end of the filling tube (22) is closed with the closure disc (24) which is secured to the tube (22) by the weld (29). For the supply of hydraulic fluid in the filling tube (22) is the sleeve (27), the spacer ring (25) and the wall of the filling tube (22) passing through the filling opening (28). Associated with the filling tube (22) is the support element (26), which is perpendicular to the geometric longitudinal axis (χ) and welded to the tube (22), the spacer ring (25) and the sleeve (27), in the same way as the sleeve (27). on the spacer ring (25), the latter being welded at its outer end to the filling tube (22) and the closure disc (24).

The above-described pipe constructions (I to ΠΙ) or the filler (14) are made of medium strength steel stock, which is capable of withstanding a liquid pressure of 100 to 300 bar and which is provided with the indentation (1) tube (2) on the effect of liquid pressure to a plastic deformation is suitable. "The tearing of the ends and breakage of the welds during expansion with the hydraulic fluid are prevented by the closure element (11); as mentioned earlier, are the coupling pins (20) and coupling sleeves (30, 30a) with welds (15, 23) attached to the pipe. Coupling elements (20, 30, 30a) and closure elements (11) are advantageously made of steel. The load capacity of the screw-threaded connections (5, 9) can be dimensioned so that they are able to withstand the demands arising from the pipe and other metal structures suspended in the pits, formed by the tubular structures.

The pipe construction according to the invention can be used in numerous ways and for a variety of applications.

If one intends a relatively short recessed anchor z. B. in the wall or sole of a

To install pit route, drilled a hole in a known manner and introduces into this the pipe construction shown in Fig. 1 (I) so that the closure element (11) facing the end inside

-4AT 394 248 B

End of the hole is located, while the coupling pin (20) in the vicinity of the plane of the rock wall or the sole, but within which lies.

The tube construction (1) is filled with the hydraulic fluid or extended by the filling sleeve (30a) of the filler (14) as shown in FIG. 7 in the drilled hole, on the coupling bolt (20) unscrewed and the filler (14) connects with a (known per se) liquid compressor, while the filling gun is inserted into the through hole (28) of the filler (14), then the under Pressed liquid at a pressure of 100 to 300 bar in the tube (2) of the pipe construction (1) (the path is shown in Fig. 1 and 7 indicated by the arrows (a)).

At the threaded connection points (5.9), the sealing rings (10) secure the seal, which means that the pressure medium, the pressure of which is continuously increased, can by no means escape at the threaded connection points (5, 9). The high-pressure liquid expresses the indentation (1) of the tube (2), the tube (2) is deformed - at least approximately - to a circular cross-section, is applied to the wall of the hole drilled in the rock; Now, when the filler (14) is removed, the fluid pressure ceases and the tube functions as a recessed anchor. Of course, a built in the manner described in the rock tube construction (1) for removing the existing in the rock block liquid or for injecting an injection liquid, for. B. Cement milk, used in the rock. If the pipe construction is to be used for conveying liquids, the closure element (11) is to be removed, which can be realized either by increasing the liquid pressure or by blasting the closure element (11).

With the aid of the in Fig. 3 shown pipe construction element (II) - with the pipe construction (I) of FIG. 1 combined - can one from the underground space, z. B. outstanding anchor from the wall or sole of the pit section without the use of a filler (14) according to FIG. 7 getting produced. In the first phase of anchor production, a hole is drilled in the rock wall whose length corresponds to the total length of the pipe construction (I and Π). is shorter by the length of the sleeve (41)), subsequently the tube construction (I) according to FIG. 1 and the pipe construction member (Π) - which is screwed by means of the coupling sleeve (30) on the coupling pin (20) of the first pipe construction - introduced; from the drilled hole protrudes the sleeve (41) provided with the filling opening. In the next work phase, the sleeve (41) is connected to the already mentioned liquid compressor, after which the tubes (2) of the pipe construction members (I and Π) correspond to the arrows (a) (see also Fig. 1) by means of the liquid whose pressure is gradually increased in the range between 100 and 300 bar, be deformed into tubes with a circular cross-section. Also in this case prevents the sealing ring (10) the escape of the pressure medium with full certainty; after the compressor has been removed, the anchor is available, whereupon loads (e.g. B. Piping, fittings, etc.) can be hung. Of course, the tube construction thus formed by the sealingly joined members (I and Π) may equally be used for discharging Gestingingsgewässem and injecting a post-curing liquid into the rock, in the last-mentioned case, the liquid to be injected via the filling opening (13) is fed ,

The in Fig. 4 shown intermediate piece can both the pipe construction (I) and the pipe construction (II) or even simultaneously sealingly connected because at one end of the coupling pin (20) at the other end, the coupling sleeve (30) is present. With the help of this intermediate piece (III) can be made within the practical limits anchor in any length, either in the normal version (the end protrudes from the wall), or in recessed design, or for draining liquids or for injecting, since the flow through the Guaranteed full-length liquid of the pipe construction, which is also confirmed by the flow direction of the hydraulic fluid indicative arrows. At the same time, all threaded connections are secured with the sealing rings (10). In order to promote liquids, the closure element (11) (Fig. 1) are removed in the manner already described after completion of the anchor either by liquid overpressure or blasting.

The advantage of the invention is the solution according to the invention has the advantages of serving for the same purpose, united previously known solutions, at the same time eliminating their deficiencies, namely: the pipe construction can be easily and quickly mounted, the manufacturing technology is simplified, the construction can be made in any length within the practical limits, because the elements are simple, can be extended with threaded connections, At the same time the sealing of the connection points is completely solved.

The pipe construction satisfies a variety of practical requirements: it can be used as a normal rock bolt with a protruding end or as a recessed design, but it is well suited for draining rock water or for injecting any rock solidifying liquid, e.g. As cement milk, in the rock. Thus, the solution can be used successfully for numerous purposes in mining, tunneling, metro, etc.

Of course, the invention is not limited to the exemplary solutions described here, but it can be realized in numerous versions within the protection circuit defined by the claims.

-5AT 394 248 B