WO2007098965A1

WO2007098965A1 - Tube protection with plugged tube cladding

Info

Publication number: WO2007098965A1
Application number: PCT/EP2007/001845
Authority: WO
Inventors: Dieter Köhler; Olaf RÖHRIG
Original assignee: Mashinenbau Kolk Gmbh
Priority date: 2006-03-04
Filing date: 2007-03-03
Publication date: 2007-09-07
Also published as: DE202006003409U1; EP1994253A1

Abstract

The invention relates to a tube protection (1) for protecting a tunnel construction (2) against rockfalls, with a number of tube claddings (5), arranged around the circumferential profile of the tunnel construction (2) and running essentially longitudinally along the tunnel construction (2) through the rock (3), at least one tube cladding (5) being made up of at least two interconnected tube cladding sections (7) each with a non-threaded collar section (9) and a non-threaded tenon section (8) and the tube cladding sections (7) are connected such that the tenon end (8) of the first tube cladding section (7) is inserted in the collar end (9) of the second tube cladding section (7). The aim of the invention is to develop the tube protection (1) such that the tube cladding sections (7) thereof can be rapidly and securely connected without using a press device. Said aim is achieved, wherein the tenon end (8) is provided with a lug (12) and the tenon end (8) with a lug groove (14) into which the lug (12) clips.

Description

Pipe umbrella with inserted ducts

The present invention relates to a pipe screen for shielding a tunnel construction against rockfall, with a plurality of cladding tubes, which are arranged on the profile circumference of the tunnel structure and extend substantially along the tunnel structure through the mountains, wherein at least one cladding tube of at least two interconnected Hüllrohrabschnitten each having a threadless, provided with an inner cone socket end and a threadless, provided with an outer cone spigot end and wherein the Hüllrohrabschnitte are connected by the fact that the spigot end of the first Hüllrohrabschnitts is inserted into the socket end of the second Hüllrohrabschnitts.

State of the art

It is known when driving tunnels or routes in loose rock or low depths to secure the tunnel or the route through a pipe shield against rockfall. For this purpose, a plurality of cladding tubes is introduced into the mountains at the profile extent of the tunnel structure, which extend substantially longitudinally - usually at an angle of about 5 ° - along the tunnel structure. These ducts are filled with a filling material such as concrete and thus form a line-like net surrounding the tunnel structure. Described is such a pipe screen in DE 200 09 667 U1.

The cladding tubes are introduced into the mountains using a double-tube drilling method - impact or rotary impact drilling. In doing so, a drilling crowned by an inner linkage driven by the hammer drill and simultaneously pulls a coaxially arranged to the drill string cladding tube in the resulting hole in order to line it from the inside. After the bore has been lowered, the inner linkage and possibly also the drill bit are removed, but the cladding tube remains in the borehole and cement is filled. Such a double-tube drilling method is described in AT 407895 B.

Since very long sheaths are associated with large drill hole depths, these are usually composed of several interconnected Hüllrohrabschnitten for better handling. The drill guide, which brings down the holes for the pipe screen, is equipped with a magazine from which the individual Hüllrohrabschnitte are removed one after the other and then joined together. A drill carriage when making a pipe screen is shown in FIG.

Fig. 1: Drill mount during pipe screen drilling (prior art).

There are different concepts to connect the ducts of a pipe umbrella with each other. Screwed pipe connections are widely used, in which the cladding tubes each have an inner or an outer thread at the ends. The internal thread is screwed into the external thread. Disadvantage of these screwed ducts is that they can dissolve when the drill bit has to be rotated backwards. This is the case when the drill bit gets stuck. Already partially loosened screw connections are no longer able to transmit the required bending moments between the cladding tube sections, so that the carrying capacity of the tube screen is not given at this point. As a rule, then you have to re-drill.

There are also known helically connected ducts known. Thus, in a known from the AT 407895 B drilling method, a separate coupling piece is used, which connects two abutting cladding tubes together. Disadvantage of this solution is that with the coupling elements in addition to the Hüllrohrabschnitten other components introduced into the well and must be handled accordingly. In addition, such coupling elements can transmit only low bending moments.

Furthermore, DE 10 2004 020 065 B3 discloses a tube connection suitable for pipe screen drilling, in which the casing tube sections each have a spigot end and a socket end. The outer conical end of the pin is inserted into the inner conical sleeve end, so that a frictional connection between the Hüllrohrabschnitten without additional coupling elements. However, this solution provides a plastic deformation of the wall of the socket end in such a way that inwardly pressed material engages in provided grooves of the pin end and thus forms an additional, non-releasable positive connection with the necessary strength. Disadvantage of this solution is the inherent radial compression of the material of the socket end. For this purpose, a large-area device is required, which must be arranged on the drill carriage. As can be seen in Figure 1, in the area marked "A", at the outermost edge of the working face where the cladding tube sections are joined together, there is little space, so that an arrangement of a crusher device is structurally difficult 5 ° C. The device for pressing in the tube sections also considerably increases the weight to be moved by the carriage so that the movement hydraulics of the carriage must be correspondingly improved.

task

The present invention is therefore the object of developing a pipe shield so that its individual Hüllrohrabschnitte can be permanently connected without the help of additional coupling elements and without an additional, expansive pressing device.

solution

This is achieved in that the spigot end is provided with at least one, radially projecting nose over the outer cone, that the spigot end is further provided on its outer side with at least one peg groove projecting radially behind the outer cone, wherein the outer cone extends exclusively between the pin and the nose, and that the sleeve end is provided with a sleeve groove projecting radially behind the inner cone into which the nose engages.

In the pipe shield according to the invention the cladding tubes are thus joined positively by a snap connection formed from nose and sleeve groove. A plastic deformation of the sleeve material does not take place because the pin end thanks to the pin groove, which reduces the moment of resistance of the pin end deformed when pushed together only in the elastic region and finally engages with the nose resiliently in the socket groove. For this reason, no additional pressing device is needed. Rather, the ducts can be added either with the already present on the drill mount hammer feed or alternatively with a specially provided for this linear cylinder. Such a linear cylinder could extend along the drill carriage and would thus not protrude into the narrow, marked in Figure 1 with "A" working space.

It should be clarified that the ducts of the pipe umbrella according to the invention are not only form-fitting joined via the latching in the sleeve groove nose, but also also non-positively via the nested cones. The tension in the conical seat is favored by the fact that the outer cone extends only between pin groove and nose. In the construction of the pipe shield is thus ensured that the Hüllrohrabschnitte not solve each other even when reversing the drill bit and always transmit the necessary bending moment. Additional coupling elements are eliminated.

The present invention can be carried out in two variants, namely in the already described first variant according to claim 1, wherein the nose is located at the spigot end. In the second embodiment according to claim 3, the nose is at the socket end and snapped into a corresponding

Pin groove on the outer cone. When the nose according to embodiment 1 is at the end of the spigot, it is advantageous to slit it axially, so that the noses formed by the slot spring in better when pushed together. The better compression behavior allows the use of a larger, more radially projecting nose, which in turn allows better power transmission between the journal end and sleeve end thanks to their larger contact surface.

embodiments

The present invention will now be explained in more detail with reference to two exemplary embodiments. For this show:

Fig. 1: Drill mount during pipe screen drilling (prior art);

Fig. 2a: Hüllrohrabschnitte according to Embodiment 1 without;

Fig. 2b: Hüllrohrabschnitte according to Embodiment 1 joined;

Fig. 3a: Hüllrohrabschnitte according to Embodiment 2 without;

Fig. 3b: Hüllrohrabschnitte according to Embodiment 2 joined.

The erection of a pipe shield 1 when driving up a tunnel structure 2 in the mountains 3 is shown in FIG. For this purpose, at the working face 4 of the tunnel structure 2, a plurality of cladding tubes 5 are introduced into the mountains 3 substantially longitudinally, ie at an angle of approximately 5 °, along the profile circumference of the tunnel structure 2 by means of a drilling jib 6. The cladding tubes 5 are filled after removal of the inner drill string with cement and thus divert the above-pending rock pressure around the profile of the tunnel structure 2 from around. The working face 4 is only driven forward when the last introduced cladding tubes 5 are sustainable. The cladding tubes 5 are composed of a plurality of interconnected Hüllrohrabschnitten 7. This takes the Hüllrohrabschnitte 7 from a magazine and connects them together by inserting a located on the next Hüllrohrabschnitt 7 journal end 8 in a located on the previous Hüllrohrabschnitt 7 socket end 9.

Spigot end 8 and socket end 9 of a first embodiment of the cladding tubes 7 of the tube screen 1 according to the invention are shown in Figures 2a and 2b. Each Hüllrohrabschnitt 7 has a spigot end 8 and a socket end 9. The Hüllrohrabschnitte 7 are connected by the spigot end 8 of the first Hüllrohrabschnitts 7 (left in Figure 2a) in the socket end 9 of the second Hüllrohrabschnitts 7 (in Figure 2a right) is inserted.

FIG. 2b shows two cladding tube sections 7 inserted one inside the other. The force transmission takes place on the one hand via a conical seat, which is composed of an outer cone 10 on the spigot end 8 and of an inner cone 11 on the socket end 9. In addition, a nose 12 located at the spigot end 8 engages in a sleeve groove 13 located on the socket end 9. This results in an additional positive connection between the Hüllrohrabschnitten. 7

In connected Hüllrohrabschnitten 7, the pin end 8 is deformed only in the elastic region. The expansion during pushing together is greatest in the area of a pin groove 14, since the casing tube section has its lowest moment of resistance in this area. In addition, the spigot end 8 is axially slotted, so that on the circumference of the spigot end 8 more lugs 12 arise, which einfedem when inserted into the socket end 9 with less effort; see. FIG. 2a.

After a shown in Figures 3a and 3b, the second embodiment of the invention, the nose 12 is disposed on the socket end 9 of the Hüllrohrabschnitts 7. In the assembled state, the nose 12 engages in a pin groove 14 at the pin end 8 of the adjacent Hüllrohrabschnitts 7. When in Figure 3a pushing together the Hüllrohrabschnitte 7 creates the greatest elongation in the region of the Muffennut 13th

Claims

claims

1. Pipe shield (1) for shielding a tunnel structure (2) against rockfall,

5 a) with a plurality of cladding tubes (5), which are arranged on the profile circumference of the tunnel structure (2) and extend substantially along the tunnel structure (2) through the mountains (3),

b) wherein at least one cladding tube (5) of at least two interconnected Hüllrohrabschnitten (7) is composed, each a lo threadless, with an inner cone (11) provided socket end (9) and a threadless, with an outer cone (10) provided pin end (8) have,

c) and wherein the Hüllrohrabschnitte (7) are connected in that the pin end (8) of the first Hüllrohrabschnitts (7) in the socket end (9) of the i5 second Hüllrohrabschnitts (7) is inserted,

characterized ,

d) that the spigot end (8) has at least one nose (12) projecting radially beyond the outer cone (10),

E) that the spigot end (8) has on its outer side at least one spigot groove (14) projecting radially behind the outer cone (10), f) wherein the outer cone (10) extends exclusively between pin groove (14) and nose (12),

g) and that the socket end (9) has a sleeve groove (13) which projects back radially behind the inner cone (11) and into which the nose (12) engages.

5 snaps.

2. Pipe screen (1) according to claim 1, characterized in that the pin end (8) is axially slotted.

3. Pipe shield (1) for shielding a tunnel structure (2) against rockfall,

lo a) with a plurality of cladding tubes (5), which are arranged on the profile circumference of the tunnel structure (2) and extend substantially along the tunnel structure (2) through the mountains (3),

b) wherein at least one cladding tube (5) of at least two interconnected Hüllrohrabschnitten (7) is composed, each of which i5 a threadless, with an inner cone (1 1) provided socket end (9) and a threadless, with an outer cone (10) provided Have spigot end (8),

c) and wherein the Hüllrohrabschnitte (7) are connected in that the pin end (8) of the first Hüllrohrabschnitts (7) in the socket end (9) of the

20 second envelope pipe section (7) is inserted,

characterized ,

d) that the socket end (9) has at least one nose (12) projecting radially over the inner cone (11),

25 e) that the socket end (9) has on its inside at least one sleeve groove (13) which projects back radially behind the inner cone (11), f) wherein the inner cone (11) extends exclusively between the sleeve groove (13) and the nose (12),

g) and that the spigot end (8) has a journal groove (14) projecting radially behind the outer cone (10) and into which the nose (12) engages.