DE950519C

DE950519C - Penstock

Info

Publication number: DE950519C
Application number: DES43963A
Authority: DE
Original assignee: Sulzer AG
Current assignee: Sulzer AG
Priority date: 1955-05-12
Filing date: 1955-05-17
Publication date: 1956-10-11

Description

Druckrohrleitung Die Erfindung bezieht sich auf eine Druckrohrleitung mit einer äußeren und einer inneren Rohrschale und einem Füllstoff zwischen den beiden Rohrschalen, insbesondere auf eine in Gebirgsstollen verlegte Rohrleitung.Pressure pipeline The invention relates to a pressure pipeline with an outer and an inner tube shell and a filler between the both pipe sections, in particular on a pipeline laid in a mountain tunnel.

Es ist bereits vorgeschlagen worden, ein doppelwandiges Druckrohr zu verwenden, wenn wegen großer Rohrquetschnitte und wegen hoher Innendrücke die Rohrwandstärke so dick würde, daß eine zuverlässige Schweißung - vor eIlem, wenn sie bei der Montage hergestellt werden muß - nur unter großem Aufwand erfolgen kann. Bekanntlich nimmt der Schweißquerschnitt einer Schweißnaht quadratisch mit der Höhe der Schweißnaht zu. Man kann also durch die Aufteilung des Rohres in eine innere und eine äu*ßere Rohrschale und bei Verwendung eines geeigneten Füllstoffes zwischen den beiden Rohrschalen erreichen, daß sich das Rohr aus Blechen von etwa der halben Dicke gegenüber einer einwandigen Ausführung zusammensetzt. Auf diese Weise erhält man aber zwei Schweißnähte an Stelle einer einzigen.It has already been proposed to use a double-walled pressure pipe if the pipe wall thickness would be so thick because of large pipe squeeze cuts and high internal pressures that a reliable weld - especially if it has to be made during assembly - can only be done with great effort. It is known that the weld cross section of a weld seam increases quadratically with the height of the weld seam. By dividing the pipe into an inner and an outer pipe shell and using a suitable filler between the two pipe shells, it is possible to achieve that the pipe is composed of sheets of about half the thickness of a single-walled version. In this way, however, you get two welds instead of a single one.

Der Grundgedanke der Erfindung besteht darin, daß die Schweißnaht oder eine sonstige Verbindung, beispielsweise eine Schraub- oder Nietverbindung, zwischen den Rohrabschnitten der äußeren Schale überflüssig ist. Die erfindungsgemäße Druckrohrleitung ist also dadurch gekennzeichnet, daß die einzelnen Rohrabschnitte der äußeren Schale höchstens über einen Teil ihres Umfangs - beispielsweise mittels einer Heftschweißung - fest miteinander verbunden sind. Es genügt sogar, wenn die Der Montagevorgang kann wie folgt verlaufen. Der innere und der äußere Rohrabschnitt werden gemeinsam eingefahren. Die äußeren Rohrabschnitte werden aneinandergesetzt. Nunmehr kann bereits an dem betreffenden Abschnitt die äußere Rohrschale mit Beton hinterfüllt werden. Dies kann sogar unter Druck geschehen; die Dichtung ii bietet Gewähr, daß kein Beton durch die Stoßstelle zwischen den beiden äußeren Rohrabschnitten entweichen kann. Es braucht anschließend nur noch die Schweißnaht 7 zwischen den beiden inneren RohrabsCinitten hergestellt und derRaum zwischen den beiden Rohrschalen mit einem Füilstoff versetzt zu werden, welcher vorteilhaft abschnittsweise unter Druck injiziert wird. Auf die gleiche Weise können die nächstfolgenden Rohrabschnitte verlegt werden, bis schließlich die ganze Druckrohrleitung fertiggestellt ist.The basic idea of the invention is that the weld seam or some other connection, for example a screw or rivet connection, between the pipe sections of the outer shell is superfluous. The pressure pipeline of the invention is therefore characterized in that the individual tube sections of the outer shell at most over a part of its periphery - are rigidly connected - for example by a tack weld. It is even sufficient if the assembly process can proceed as follows. The inner and outer pipe sections are retracted together. The outer pipe sections are put together. The outer pipe shell can now be backfilled with concrete at the section in question. This can even be done under pressure; the seal ii ensures that no concrete can escape through the joint between the two outer pipe sections. Then only the weld seam 7 needs to be produced between the two inner pipe sections and the space between the two pipe sections mixed with a filler, which is advantageously injected in sections under pressure. The next pipe sections can be laid in the same way until the entire pressure pipeline is finally completed.

Es bieten sich viele Möglichkeiten, dieses Verfahren abzuwandeln. So kann beispielsweise zunächst die gesamte äußere Rohrschale verlegt und abschnittsweise mit Beton hinterfüllt werden, bevor abschnittsweise die innere Rohrschale verlegt wird. Wenn die Verhältnisse es zulassen, kann statt der Schweißnaht 7 auch eine Schrauben- oder Nietverbindung zwischen den beiden inneren Rohrabschnitten verwendet werden. In jedem Fall wird aber durch den erfindungsgemäßen Vorschlag jeweils eine der bisher notwendigen festen Verbindungen eingespart.There are many ways to modify this process. For example, the entire outer pipe shell can first be laid and backfilled in sections with concrete before the inner pipe shell is laid in sections. If the conditions permit, a screw or rivet connection can also be used between the two inner pipe sections instead of the weld seam 7. In any case, the proposal according to the invention saves one of the previously necessary fixed connections.

Claims

PATENT CLAIMS: i. Pressure pipeline with an outer and an inner pipe shell and a filler between the two pipe shells, in particular pipeline laid in mountain tunnels, characterized in that the individual pipe sections of the outer shell are connected to one another at most over part of their circumference.

2. Pressure pipeline to. Claim i, characterized in that the outer pipe sections are attached to one another without a fixed connection. 3. Pressure pipeline according to claim i, characterized in that the outer pipe sections touch one another with their end faces. 4. Pressure pipe riding according to claim i, characterized in that the outer pipe sections are placed against one another with the interposition of a seal. 5. Pressure pipeline according to claim 4, characterized in that the seal consists of rubber. 6. Pressure pipeline according to claim 4, characterized in that the seal consists of a soft metal. 7. Pressure pipeline according to claim i, characterized in that the filler is under pressure between the two pipe shells in the unloaded pipe. outer pipe sections are attached to one another without a fixed connection, namely the forces to be absorbed by the outer pipe shell can also be supported without such a fixed connection. In most cases it will be sufficient if the outer pipe sections merely touch one another with their end faces. However, if it is to be feared that seepage water, which is known to be under very high static pressure in the mountains, can penetrate through the gap at the contact surface into the space between the two pipe sections or if the space between the outer pipe section and the rock is backfilled with concrete should, it is useful if the outer pipe sections are attached to one another with the interposition of a seal. You can also combine the seal with the face contact. The seal can be made of rubber or a soft metal, for example soft iron. The recommended filler is generally mortar, i. H. a mixture of fine sand, cement and water that sets after filling. E - but s are also other solid or even liquid or gaseous fillers in question, particularly the filler may be between the two pipe sections in the unloaded pipe under pressure and thus relieve the internal pipe shell under internal pressure. Further features of the invention emerge from the description in which an exemplary embodiment is explained in more detail with reference to the drawing. 1 shows a cross section through a mountain tunnel in which a pressure pipeline according to the invention is laid; Fig. 2 shows, in an enlarged detail from Fig. 1, the point at which two outer and two inner tubular steel sections meet. The mountain tunnel is bounded by natural rock. The pressure pipeline consists of an outer pipe shell: 2 and an inner pipe shell 3, between which a filler 4 is located. The space between the outer pipe shell 2 and the rock i is backfilled with concrete 5. A connection point 6 between two pipe sections, each of which can consist of a pipe section - as shown in the drawing - or also of several pipe sections that have already been connected to one another, is shown enlarged in FIG. The two inner pipe sections 3 ″ and 3 ″ are connected to one another by the weld 7. A floor strip 8, which is welded to the inner pipe section 3 * ', is used to form a well-shaped welding trough. The pipe sections 2 'and 2 "' abut with their end faces 9. With the aid of a bottom strip io welded to the outer pipe section 2", a space is formed between the beveled end faces 9 in which a seal ii is inserted.