DE2855646A1 - INSERTION-SLEEVE CONNECTION FOR DUCTILE CAST TUBES IN PARTICULAR - Google Patents

Description

Push-in socket connection for especially ductile cast iron pipes

State of the art

It is known "one end of a socketed ductile Cast iron pipes on their outer circumferential surface by a tarring or through bitumen paint against aggressive media, especially against corrosive influences in the ground protection. With so-called thick coatings made of bituminous or high-quality polymeric materials are also available the area of the insertion end of such ductile iron pipes "from the envelope because the layer thickness of these envelopes exceeds the tolerances of the socket gap. The uncoated pipe insertion end must be protected from corrosion on the construction site after the connection has been made what is usually done by plastic bandages or shrink tubing happens. The use of plastic bandages is required careful work, so that the quality relatively large Sohwanktongen subject to, while shrink tubing is relatively tenor.

task

The invention is based on the object of a push-in socket connection for especially / ductile cast iron pipes, be ^ which the corrosion protection of the pipes should be completely prefabricated in the factory. In doing so, the invention is intended to be the Slide-in socket connection can also accommodate changes in location if necessary, for example when the pipes alternating

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Are subjected to longitudinal movements or their longitudinal axes by a certain angle from the coaxial position to each other be angled.

Solution .

The task is reproduced by the in claim T. Features solved.

Some advantages

The pipes and the slide-in socket connections are according to completely enveloped or covered on the outside, so this Components can no longer come into contact with aggressive components of the soil or the like at any point. The longitudinal mobility of the tube plug-in end and its angling ability are retained, so that even with changes in location the pipes are fully protected against corrosion.

A particular advantage can be seen in the fact that a ready-to-install Pipe delivered from the manufacturing plant to the construction site no further processing, in particular no additional processing, after the socket connection has been made More insulation protection is required.

As a material for the plastic sheath can be used with advantage, for. B. polyethylene can be used. Such a plastic, in particular polyethylene jacket, z. B. after the extrusion process together with an underlying Apply adhesive film, with both layers or sheaths being formed over the circumference of the ring protection part, see above that the adhesive layer applied under the polyethylene layer creates an intensive, tight connection between the ring

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protective part on the one hand and the polyethylene casing on the other manufactures.

Other embodiments

In the embodiment according to claim 2, the ring protector and the seal can be handled as a unitary component, whereby the assembly is facilitated and accelerated. DNBE ^r is mnglich, the ring protection portion and the seal over the cross-sectional areas respectively, at different ohore-Hn ^ t <=> n or i with a different sized load rebounds?, Τ it! to train, ζ. B. determine the hardness of the ring guard higher m. Advantageously, however, longitudinal protection parts and seal can also be provided as a single piece of material with a Shore hardness that is constant over the entire cross-sectional area of the seal unit, which is higher than with conventional seals, especially with so-called Tyton seals for e.g. B. ductile iron pipes. The elastic deformability of the seal must, however, be fully retained, while on the other hand the ring protection part is given greater resistance to mechanical influences due to a higher hardness Polymers usually used for such sealing units are so resistant that even without protective caps, if the pipes are handled properly, in particular during loading and unloading, there is no risk of damage which would impair their function.

In claim 3 , an advantageous embodiment of the invention is described, which makes the factory prefabrication & corrosion protection of ductile iron pipes according to the invention particularly easy.

Claim 4 describes a sealing unit that can be used with advantage, which is particularly suitable for use in pressure pipes.

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In claim 5, a further advantageous embodiment of the invention is described.

In the embodiment according to claim 6, there is a particularly strong, tight connection between the sealing part and the sleeve.

In the drawing, the invention is illustrated - schematically - using an exemplary embodiment. Show it:

1 shows a partial longitudinal section through a push-in socket connection shortly before the pipes are pushed together;

FIG. 2 shows the slide-in / socket connection shown in FIG. 1 in the assembled state, also in partial longitudinal section, and

3 shows a sealing unit from FIGS. 1 and 2, generally a longitudinal section,

In the drawing, the invention is applied to a movable slide-in socket connection for z. B. subject to alternating longitudinal movements and / or angular displacements ductile iron pipes shown, the z. B. can be used as drinking water pipes, sewage or gas pipes. Example VeJ Se know drinking water pipes with a not shown ! inner lining made of concrete.

The tubes are denoted by the reference numerals 1 and 2 and each have one from FIG. 1 at one end or 2 visible sleeve / on, in the sleeve space 4 an annular seal 5 with a cross-section substantially circular contour is arranged (not deformed state; Fig. 1).

The sleeve space 4 is in the axial direction by one Ring shoulder 6 or 7 limited.

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A ring shoulder 10 'directed inwardly against the sleeve 3 is connected to the seal 5 by a connecting part 9 connected via a groove 8, which is approximately rectangular or trapezoidal in cross-section and which in the assembled state (FIGS. 1 and Z) is full, i.e. form-fitting , in one formed by the annular shoulder 7 and by a centering collar 11 at the end, Riögnut 12 snugly, so form-fitting, rests.

A transition part 13 adjoins the ring shoulder AO in one piece in terms of material, which is also formed in one piece in terms of material with a radially directed ring protection part 14.

The transition part 13 and ring protection part 14 existing Part can, however, also go to the kind of emaciated Tytση seal formed seal 5, 10 formed on the end face, for example vulcanized or glued on.

It is also possible to use sections!?, 9, 10, 13 and to be measured differently in their Shore hardnesses. For example, the Shore hardness of part 5 can be made lower, be like the Shore hardness of part 14.

But it is also possible for the Shore hardness to be greater than that for Tyton seals (registered trademark) are common too determine so that the seal 5 and transition or ring protection. part 13 and 14 formed sealing unit on average a total has a greater Shore hardness than usual, which, however, does not impair the functionality of the seal 5, 10, on the other hand the end-face ring protection part 14 a gives higher mechanical strength.

As can be clearly seen in particular in FIGS. 1 and 2, the two cast iron pipes 1 and 2 are over their entire length and

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over its entire circumference with a plastic jacket 15 or

16 encased in the illustrated embodiment Polyethylene besiärfc, which is extruded onto the Pipes 1, 2 and 3, at the same time with an adhesive layer located below the plastic jacket 15 and 16

1 ^{7 is} applied. This is z. B. the extrusion process.

Figures 1 and 2 clearly show that the Kun.s'-stoffmäntel and plastic sheaths 1 fi and Λ C-, extend over the circumference of the ring protection part 14, such that the plastic sheaths 15 and 16 each with the end face 19 of the ring protection part 14 or with the end face 20 of the insertion end 2 are aligned. As a result, the Rinesch part 14 is sealed on its circumferential surface 18 and is connected to the temporary plastic casing 15 or 16 by force.

The areas 21 and 22 are also through with the facing surfaces of the ring protection part 14 and the transition part 13 Gluing tightly and firmly connected.

The tubes 1 and 2 with the inserted and glued-on sealing unit 5, 10, 13, 14 and the applied plastic -riiMillnng 15 or 16 prefabricated in the manufacturer's works and on otf> ß ^ uSteile brought. This is where the ductile iron pipes are needed titcr Tioct "to be pushed together in the usual way, thereafter the pipes - as can be seen from FIG. 2 - are complete on their outer sides facing the ground or the like encapsulated and do not offer any attack to corrosion. No reworking is necessary, for example no shrink tubing or bandages to be applied. This results in a very high laying speed with constant corrosion protection.

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Those described in the description and in the claims and features shown in the drawing can be used individually or in any combination be essential for the realization of the invention.

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Claims (1)

285564a December 15, 1978 ρ / t THYSSEN INDUSTRIE AG Am Thyssenhaus 1 4300 Essen 1 Claims 11, Push-in socket connection for particularly ductile Cast iron pipes, with an elastic seal arranged in the inner socket space for a pipe plug-in end, wherein the pipes on their outer surface with a foreign, corrosion-resistant casing are provided, with a centering collar at the socket inlet, thereby characterized in that the tubes (1, 2) over are encased the entire length on their outer circumferential surface with a plastic jacket (15, 16) and that the seal <5, 10) is extended to the outside through the sealing gap by an elastic ring protection part (14), wherein the ring protection part (14) rests against the outer sleeve end face and on the circumference side (18) with the plastic jacket (15 or 16) is integrally tightly connected. 2, push-in socket connection according to claim 1, characterized in that that the ring protective part (14) and the seal (5, 10) (sealing unit) are integrally formed are. ORIGINAL INSPECTED Q30026 / 0450 2855δ4β 3. Slide-in socket connection according to claim 2, characterized in that that the sealing unit (5, 10, 13, 14) before the application of the plastic jacket (15 or 16) in the Brought functional layer and then the relevant plastic jacket (15 or 16) with an underlying Adhesive layer (z. B. 17) applied to the pipe in question (z. B. 1) and the ring protection part (14) are. 4. Push-in socket connection according to claim 1 or one of the following, characterized in that the seal (5, 10) is designed in the manner of an emaciated (reduced in cross-section) Tyton seal, to which an annular Transition part (13) adjoins the protective ring part (14). 5. Slide-in socket connection according to claim 4, characterized in that that the annular transition part (13) against the plastic jacket (z. B. 16) of the plug-in pipe end (2) is present. 6. Push-in and socket connection according to claim 1 or one of the following, characterized in that there is also a wall part running parallel to the end face of the sleeve (3) of the ring protection part (14) and the circumferential surface of the annular transition part facing the inner surface of the sleeve (13) are each tightly and firmly connected to the sleeve by gluing. 030026/0450