DE8230424U1 - SOCKET CONNECTION FOR HEAT-INSULATED PIPES - Google Patents

Description

J! 'ι ¹

kabeimetal electro limited liability company

E 1-1889 10/26/82

Socket connection for heat-insulated pipes

The innovation concerns a socket connection for thermally insulated Line pipes, which consist of a medium-carrying inner pipe, preferably made of steel, one the inner pipe surrounding thermal insulation layer made of 'foamed Plastic, preferably made of polyurethane, and an outer tube made of plastic, in which the foam free ends of the inner pipes of two pipe sections to be connected are welded together, the connection point is covered by a sleeve resting on the outer pipe ends and the one between the inner pipe and the sleeve located annulus is filled with foam, the sleeve body from a with an overlap over the Connection point consists of molded plastic tape, which both with the outer pipe ends and along the overlap seam by means of an electrically heatable belt is welded.

Such a socket connection is from DE-GM 82 04 known. The well-known socket connection is characterized by simple manufacture and a particularly moisture-proof design of the weld seams.

However, it has been shown that at a large distance between the outer tubes or when using less rigid material, an exact welding of the Longitudinal seam RUr could be achieved with relatively high effort \

The innovation is therefore based on the task that to improve known socket connection to the effect that the overlap seam without particularly high effort can be welded liquid-tight.

This object is achieved in that, according to the innovation, one on the outer pipe ends below the overlap seam resting support rail is provided. This support rail takes care of the necessary during the welding process Back pressure. The Sbützschiene 'is particularly advantageous from a T-profile, which expediently from a consists of thin-walled sheet metal. The T-profile is light, but is still stiff enough to withstand the counter pressure. Both the support rail and the sleeve lie on an annular shape worked into the ends of the outer tubes Recession. This has the advantage that there is no increase in diameter in the area of the socket connection the outer diameter of the outer jacket occurs. This means that no shear forces can occur in the event of movements in the ground. The foot of the T-profile lies in a longitudinal groove running in the region of the recess.

The innovation is based on the embodiment shown schematically in FIGS. ₃ s example explained in more detail.

With 1 is the medium-carrying inner pipe, which expediently consists of steel, with 2 the polyurethane foam insulation of the heat-insulated pipe and with 3 be The outer sheath is appropriately referred to as made of polyethylene. Below the overlap seam of the sleeve 5 is that T-profile 4. Numbers 6 and 7 indicate the circumferential

Weld seams or the longitudinal weld seam in the area of the overlapping seam. With 8 the Pölyurethanörtschäum produced after the production of the socket connection is designated.,

When making the socket connection shown proceed as follows:

First you bring with a suitable Wei-kzeug in the end of the outer jacket 3 in a circumferential direction trending recess 9 a. In the area of the recess 9 there is a direction of the inner tube 1 Longitudinal groove 10, introduced for example by means of a cut-off saw, the depth of which is at least the height of the foot of the T-profile 4 corresponds.

After this preparatory work, the ends of the inner tubes 1 are welded together (see 11) and that T-Profii 4 inserted into the grooves 10. Where the perimeter welds 6 should run ',' is now an unspecified: meandering shaped heating wire inserted. Now the sleeve band 5 is rolled around the connection point, with the overlap area above of the T-profile 4 is located. A meandering heating wire is also used in the area of the longitudinal weld seam 7 inserted. After mounting the clamping device - as described in DE-GM 82 04 372 - the heating current is switched on, wherein the plastic material located in the area of the weld seams 6 and 7 becomes liquid and with one another welded.

The interior space between the inner pipe 1 and the plastic sleeve band 5 is now sealed through an opening 11 checked and, if necessary, re-welded. Through the same opening 11, this can also be widened if necessary will now be the liquid foam components introduced and the in-situ foam 8 is generated.

Claims (5)

kabelmetal electro limited liability company E 1-1889 10/26/82 claims for protection 1. Socket connection for heat-insulated pipes, which consist of a medium-carrying inner pipe, preferably made of steel, a thermal insulation layer surrounding the inner pipe made of foamed plastic, preferably made of polyurethane and an outer pipe made of plastic, in which the foam-free ends of the inner pipes of two pipe sections to be connected are welded together, the connection point is covered by a sleeve resting on the outer pipe ends and the annular space located between the inner pipe and the sleeve is filled with foam, the sleeve body consisting of a plastic band formed with an overlap over the connection point, which both with the outer pipe ends and along the The overlap seam is welded by means of an electrically heatable strip, characterized in that a support rail (4) resting on the outer tube ends (3) is provided below the overlap seam (7). 4 · I t »* * ii ii i i. »Ν- - ¹ ^ t- * fT . ; » , in · _J 2Ϊ - ϊ ί. 2. socket connection according to claim 1, characterized in that the support rail (4) consists of a T-profile. 3. socket connection according to claim 2, characterized in that the T-profile (4) consists of thin-walled sheet metal. 4. socket connection according to claim 1 or one of the following, characterized. that both the support rail (4) and the sleeve (5) rests on an annular recess (9) machined into the ends of the outer tubes (3). 5. socket connection according to claim 1 or one of the following, characterized in that the foot of the T-profile (4) lies in a longitudinal groove (10) running in the region of the recess (9). i I ι ι I I