CH625325A5

CH625325A5 - Thrust securing device on a socketed-pipe connection

Info

Publication number: CH625325A5
Application number: CH1567977A
Authority: CH
Inventors: Walter Wyss
Original assignee: Heer & Co
Priority date: 1977-12-20
Filing date: 1977-12-20
Publication date: 1981-09-15

Abstract

The thrust securing device has a securing sleeve (10) which is mounted on the so-called tip end (3) of the one pipe (1) and, at one end, has a stop (14) for supporting a retaining ring (16) which is arranged on the socketed end (4) of the other pipe (2) and encloses the securing sleeve (10). The securing sleeve (10) is firmly clamped on the external circumference of the one pipe (1) by means of a clamp (19). In the clamping region, the securing sleeve (10) is constructed as an adhering grid (13), as a result of which a positive lock is virtually produced between the pipe (1) and the securing sleeve (10). In consequence, the thrust securing device can absorb very large axial forces. <IMAGE>

Description

       

  
 



   Wesentlich ist, dass der obere Hülsenteil 9 ein Haftgitter 13 aufweist. Als Haftgitter 13 wird eine aus Stegen und Öffnungen bestehende netzartige Partie des oberen Hülsenteils 9 verstanden, dessen Stege mindestens teilweise auf einer Seite vorste  



  hen. Als Haftgitter 13 eignet sich beispielsweise ein als Streckgitter bezeichnetes Material, welches direkt aus einem Blech hergestellt werden kann. Dadurch ist es möglich, den oberen Hülsenteil 9 teilweise als Haftgitter auszubilden, das somit einen integralen Teil der Sicherungshülse 10 bildet. Wie aus Fig. 1 ersichtlich ist, ist die axiale Ausdehnung des Haftgitters 13 etwas kleiner als diejenige der Klemmschelle 19, d.h. der Übergang vom Haftgitter 13 auf den glatten Teil des oberen Hülsenteils 9 ist von der Klemmschelle 19 abgedeckt. Dadurch wird erreicht, dass nicht nur auf das Haftgitter 13, sondern auch auf die Übergangspartie ein Druck ausgeübt wird, da die Stege des Haftgitters 13 in die Oberfläche des Spitzendes 3 eingedrückt werden.

  Dadurch entsteht an der Klemmstelle der Sicherungshülse 10 praktisch ein Formschluss, der die Übertragung sehr grosser Axialkräfte ohne Verschiebung des Spitzendes 3 in der Sicherungshülse 10 erlaubt.



   Die Klemmschelle 19 kann in verschiedener Weise ausgebildet sein, z.B. gemäss Fig. 1 mit zwei Teilen und zwei Spannbolzen   25, 26.    Die Klemmschelle 19 kann aber auch ein- oder mehrteilig ausgeführt sein. Es sind dann gleich viel Spannbolzen 25, 26 wie Teile der Klemmschelle 19 erforderlich. Bei grösseren Durchmessern ist es auch möglich, die Klemmschelle so breit auszuführen, dass an den Spannlappen in axialer Richtung zwei und mehr Spannbolzen 25,26 nebeneinander angeordnet werden können. Die Sicherungshülse 10 ist in Fig. 1 einteilig und axial geteilt, ebenso der Anschlag 14. Es ist jedoch auch möglich, die Sicherungshülse 10 axial zwei- oder mehrfach zu unterteilen, wobei der Anschlagring 14 in gleicher Weise unterteilt oder aber auch einteilig belassen werden kann.



   In Fig. 3 ist eine Schubsicherung dargestellt, deren Ausführung im Bereich des Haftgitters 13 von der Ausführung nach Fig. 1 abweicht. Die Sicherungshülse 10 weist hier in ihrem oberen Hülsenteil 9   Öffnungen    11 auf, in welche mit der Klemmschelle 19 verbundene Haltenocken 20 eingreifen. Das Haftgitter 13 bildet wie in Fig. 1 einen integralen Teil der Sicherungshülse 10. Durch die Haltenocken 20 wird erreicht, dass die Übergangszone des Haftgitters 13 in den glatten Teil der Sicherungshülse 10 teilweise entlastet wird, indem ein Teil der Axialkräfte über die Klemmschelle 19 und die Haltenocken 20 direkt in den glatten Teil der Sicherungshülse 10 eingeleitet wird.



   Die übrigen Bezugszeichen in Fig. 3 stimmen mit denjenigen von Fig. 1 und 2 überein und werden deshalb nicht mehr erläutert.



   In Fig. 4 ist eine weitere Ausführungsform der Schubsicherung dargestellt. Die Sicherungshülse 10 ist wie bei den anderen Ausführungen nach Fig. 1 und 3 im unteren Hülsenteil   12und    teilweise im oberen Hülsenteil 9 glattwandig ausgebildet. Das Haftgitter 13 bildet jedoch einen separaten Teil und liegt am oberen Hülsenteil 9 an. Damit hier eine einwandfreie Schubsicherung erreicht wird, ist der obere Hülsenteil 9 mit den Öffnungen 11 wie in Fig. 3 versehen, in die Haltenocken 20 der Klemmschelle 19 eingreifen. An dem den Haltenocken 20 gegenüberliegenden Rand der Klemmschelle 19 ist ein Stützrand 27 angeordnet, an dem sich das Haftgitter 13 abstützt. Der Stützrand 27 kann sich als zusammenhängender oder unterteilter Rand um den Innenumfang der Klemmhülse 19 erstrecken.



     Zweckmässig    weisen die Haltenocken 20 und der Stützrand 27 eine geringere Höhe als die Wandstärke des glattwandigen Teils der Sicherungshülse 10 auf.



   Durch die Ausbildung des oberen Hülsenteils 9 als Haftgitter 13 wird erreicht, dass mittels der Gitterstege Vertiefungen in die Oberfläche des Spitzendes eingeformt werden können, durch welche praktisch ein Formschluss zwischen der Sicherungshülse 10 und dem Spitzende 3 des Rohrs 1 erreicht wird.



   In Fig. 4 ist anstelle der in Fig. 1 und 3 dargestellten Schraubmuffenverbindung eine Steckmuffenverbindung dargestellt. Bei dieser weist das Muffenende 4 einen Halteflansch 30 auf, an dem Hakenschrauben 31 mit Muttern 32 angreifen. Die Hakenschrauben 31 durchdringen Bohrungen 33 des Halterings 16 und halten denselben in axialer Richtung fest. Der Haltering 16 stützt sich am Anschlag 14 ab und weist eine Anzahl Durchbrechungen 34 auf.



   Das Muffenende 4 weist einen innenseitigen Flansch 35 auf, welcher einen Ringraum zur Aufnahme der Weichdichtung 6 begrenzt. Dank der platzsparenden Bauweise können die beschriebenen Schubsicherungen praktisch bei allen Muffenrohrverbindungen angewandt werden.



   Die Sicherungshülse 10 wird zweckmässig aus einem Blech hergestellt, z.B. mit   ca. 2,0-2,5    mm Stärke, von dem eine Partie als Haftgitter 13 ausgebildet wird. Es ist aber auch möglich, das Haftgitter 13 separat herzustellen und mit dem glatten Teil der Sicherungshülse 10 zu verbinden, z.B. durch Schweissen oder Löten. Die dünnwandige Sicherungshülse 10 passt sich ohne Schwierigkeit den Ungenauigkeiten des Rohraussenumfangs   an.   



   Die Sicherungshülse kann anstatt aus Blech aus aus einem Gussteil, z.B. aus duktilem Gusseisen, wie Sphäroguss o.dgl.



  bestehen . Bei Verwendung eines Gussteils kann die Sicherungshülse vorzugsweise nach der Ausführung gemäss Fig. 4 ausgebildet werden, d.h. mit getrenntem Haftgitter 13.



   Im übrigen weist die beschriebene Sicherungshülse 10 die gleichen Vorteile wie diejenige gemäss dem erwähnten älteren Recht auf, d.h. es besteht Abwinkelbarkeit der Muffenrohrverbindung, eine einwandfreie elektrische Verbindung bzw. Überbrückung und eine leichte Leitungsverlegung. 



  
 



   It is essential that the upper sleeve part 9 has an adhesive grid 13. An adhesive grid 13 is understood to be a web-like portion of the upper sleeve part 9 consisting of webs and openings, the webs of which project at least partially on one side



  hen. A material known as expanded metal, which can be produced directly from a sheet metal, is suitable, for example, as adhesive mesh 13. This makes it possible to partially design the upper sleeve part 9 as an adhesive grid, which thus forms an integral part of the securing sleeve 10. As can be seen from Fig. 1, the axial extent of the adhesive grid 13 is slightly smaller than that of the clamp 19, i.e. the transition from the adhesive grid 13 to the smooth part of the upper sleeve part 9 is covered by the clamp 19. This ensures that pressure is exerted not only on the adhesive grid 13, but also on the transition section, since the webs of the adhesive grid 13 are pressed into the surface of the tip end 3.

  This practically creates a positive connection at the clamping point of the securing sleeve 10, which allows the transmission of very large axial forces without shifting the tip end 3 in the securing sleeve 10.



   The clamp 19 can be designed in various ways, e.g. 1 with two parts and two clamping bolts 25, 26. The clamp 19 can also be made in one or more parts. The same number of clamping bolts 25, 26 as parts of the clamp 19 are then required. With larger diameters, it is also possible to make the clamp so wide that two or more clamping bolts 25, 26 can be arranged side by side on the clamping tabs in the axial direction. The securing sleeve 10 is divided in one piece and axially in FIG. 1, as is the stop 14. However, it is also possible to axially divide the securing sleeve 10 two or more times, the stop ring 14 being able to be divided in the same way or else left in one piece .



   FIG. 3 shows a push protection device, the design of which in the area of the adhesive grid 13 differs from the design according to FIG. 1. The securing sleeve 10 here has openings 11 in its upper sleeve part 9, into which holding cams 20 connected with the clamp 19 engage. As in FIG. 1, the adhesive grid 13 forms an integral part of the securing sleeve 10. The holding cams 20 ensure that the transition zone of the adhesive grid 13 into the smooth part of the securing sleeve 10 is partially relieved by a part of the axial forces via the clamp 19 and the holding cam 20 is introduced directly into the smooth part of the securing sleeve 10.



   The other reference numerals in FIG. 3 correspond to those of FIGS. 1 and 2 and are therefore not explained any longer.



   4 shows a further embodiment of the thrust safety device. As in the other embodiments according to FIGS. 1 and 3, the securing sleeve 10 is smooth-walled in the lower sleeve part 12 and partly in the upper sleeve part 9. However, the adhesive grid 13 forms a separate part and lies against the upper sleeve part 9. So that a perfect thrust protection is achieved here, the upper sleeve part 9 is provided with the openings 11 as in FIG. 3, into which the retaining cams 20 of the clamp 19 engage. On the edge of the clamp 19 opposite the retaining cams 20 there is a support edge 27 on which the adhesive grid 13 is supported. The support edge 27 can extend as a coherent or divided edge around the inner circumference of the clamping sleeve 19.



     The holding cams 20 and the supporting edge 27 expediently have a smaller height than the wall thickness of the smooth-walled part of the securing sleeve 10.



   The design of the upper sleeve part 9 as an adhesive grid 13 ensures that depressions can be formed in the surface of the tip end by means of the grid webs, by means of which a positive fit between the securing sleeve 10 and the tip end 3 of the tube 1 is practically achieved.



   4 shows a push-in socket connection instead of the screw socket connection shown in FIGS. 1 and 3. In this case, the sleeve end 4 has a holding flange 30 on which hook screws 31 engage with nuts 32. The hook screws 31 penetrate bores 33 of the retaining ring 16 and hold it in the axial direction. The retaining ring 16 is supported on the stop 14 and has a number of openings 34.



   The sleeve end 4 has an inside flange 35 which delimits an annular space for receiving the soft seal 6. Thanks to the space-saving design, the shear protection described can be used for practically all socket pipe connections.



   The securing sleeve 10 is expediently made of sheet metal, e.g. with a thickness of approx. 2.0-2.5 mm, of which a lot is designed as an adhesive grid 13. However, it is also possible to produce the adhesive grid 13 separately and to connect it to the smooth part of the securing sleeve 10, e.g. by welding or soldering. The thin-walled securing sleeve 10 adapts to the inaccuracies of the outer circumference of the pipe without difficulty.



   The securing sleeve can be made from a cast part, e.g. made of ductile cast iron, such as nodular cast iron or the like.



  consist . When using a cast part, the securing sleeve can preferably be formed according to the embodiment according to FIG. 4, i.e. with separate adhesive grille 13.



   Otherwise, the securing sleeve 10 described has the same advantages as that according to the earlier law mentioned, i.e. the socket pipe connection can be bent, a perfect electrical connection or bridging and easy cable laying.

Claims

PATENT CLAIMS 1. Shear protection on a socket pipe connection for holding together the tip end of a pipe and the socket end of a connecting pipe, with a retaining ring held axially at the socket end, which is supported on a stop of a securing sleeve fastened by means of a clamp to the outer circumference of the tip end, which holds one over the retaining ring protruding upper sleeve part encompassed by the clamp, characterized in that the securing sleeve (10) in the sleeve part (9) protruding beyond the retaining ring (16) is at least partially designed as an adhesive grille (13) which is covered by the clamp (19) .

2. thrust protection according to claim 1, characterized in that the adhesive grid (13) forms an integral part of the securing sleeve (19).

3. thrust protection according to claim 1 or 2, characterized in that the extent of the adhesive grid (13) in the direction of the tube axis is smaller than that of the clamp (19).

4. Thrust protection according to claim 3, characterized in that the clamp (19) on the socket end has retaining cams (20) which engage in openings (11) of the securing sleeve (10).

5. thrust protection according to claim 4, characterized in that the adhesive grid (13) forms a part of the other securing sleeve (10) separate part and the clamp (19) on the edge opposite the retaining cams (20) has a support edge (27) for the adhesive grid (13).

6. thrust protection according to claim 4 or 5, characterized in that the holding cams (20) and the support edge (27) have a smaller height in the radial direction than the wall thickness of the smooth-walled, to the adhesive grid (13) adjoining sleeve part (12) Locking sleeve (10).

7. thrust protection according to claim 2, characterized in that the adhesive grid (13) has a transition zone in which the mesh mesh gradually in the smooth-walled sleeve part (12) of the securing sleeve (10).

8. thrust protection according to claim 2, characterized in that the adhesive grid (13) has projecting lattice webs on the inside.

The invention relates to a thrust safety device on a socket pipe connection for holding together the tip end of a pipe and the socket end of a connecting pipe, with a retaining ring held axially at the socket end, which is supported on a stop of a securing sleeve fastened by means of a clamp on the outer circumference of the tip end, which supports one over the retaining ring protruding, encompassed by the clamp sleeve part.

The applicant's CH patent 604 073, which is considered older law, describes a thrust protection for socket pipe connections, with which the tip end of a pipe can be held together with the socket end of a connecting pipe even at higher operating pressures. This is achieved in that a securing sleeve is fastened to the tip end of the one tube and supports a retaining ring axially connected to the sleeve end by means of a stop. The quality of the frictional connection between the inside of the securing sleeve and the outer circumference of the tip end of the one tube is decisive for the axial force to be absorbed by this thrust protection; because for the holding of the retaining ring at the end of the sleeve it is possible to use a positive connection, which can absorb much higher forces than the frictional connection of the securing sleeve pressed onto the spigot end.

It can now be seen that with the shear protection according to the older law mentioned, it is possible without difficulty to hold sleeve pipe connections axially together at operating pressures of nominal pressure 16 at. With larger diameters, e.g. at nominal diameter 300, however, the thrust protection is no longer guaranteed properly. This lack of security also occurs when the security sleeve is roughened or grooved on the inside. This is not sufficient to significantly improve the frictional engagement that can be achieved by pulling the clamp together.

This is where the invention comes in, the task of which is to design a thrust connection of the type described in the introduction in such a way that, in compliance with the space requirement provided for in the previously mentioned earlier right, the tip end can be moved in the securing sleeve at even higher pressures and / or at larger ones Pipe diameters are avoided with certainty.

This object is achieved according to the invention in that the securing sleeve in the sleeve part protruding beyond the retaining ring is at least partially designed as an adhesive grille which is covered by the clamp. It can thereby be achieved that practically a positive connection between the securing sleeve and the tip end of the one tube is achieved.

The invention is illustrated in the drawing using exemplary embodiments and explained below. Show it: 1 shows a longitudinal section through a socket pipe connection with a first embodiment of a thrust protection, FIG. 2 shows a section along the line II-II in FIG. 1, Fig. 3 shows a longitudinal section as in FIG. 1 through a further embodiment of a thrust protection and Fig. 4 shows a longitudinal section as in Fig. 1 and 2 through a third embodiment of a thrust protection for a push-in joint.

In the figures, two pipes 1, 2 are partially shown, of which the pipe 1 has a spigot end 3 and the other pipe 2 has a socket end 4. In the base 5 of the sleeve end 4, a soft sealing ring 6 is inserted, which seals a gap 7 formed between the tip end 3 and the sleeve end 4. A support ring 8 is arranged on the side opposite the gap side of the sealing ring 6, by means of which the soft sealing ring 6 is pressed together and the sealing is thus effected. The support ring 8 can also be omitted and the sealing ring 6 can be pressed together in another way. On the outer circumference of the tip end 3, a securing sleeve 10 is fastened, which has at least one sleeve part, to the seal-side end of which a stop 14 is fastened, e.g. is welded on.

The stop 14 is expediently designed as a ring with a circular cross section and extends over the sleeve part or sleeve parts. A stop ring 16, designed as a screw ring, is supported on the stop 14 and is provided with an external coarse thread 17 which is screwed into a corresponding internal thread 18 of the sleeve end 4. The upper sleeve part 9 protruding from the screw ring 16, which together with a lower sleeve part 12 forms the securing sleeve 10, has a section designed as an adhesive grid 13. A clamp 19 is placed around the upper sleeve part 9, which has clamping tabs 21, 22, each with a bore 23, 24, through which a screw bolt 25 with a nut 26 extends. The upper sleeve part 9 of the securing sleeve 10 is pressed against the outer circumference of the tip end 3 with the clamp 19.