DE4112976A1 - Elastomeric seal, esp. for sewage pipe socket joints - has integral, hook-ended elastomeric strip half-coated with lubricating compound before hooking strip free end to seal - Google Patents

Abstract

A socket coupling has an elastomeric seal (1) fixed, via anchor feet (2,3), to the socket section (12). An elastomeric strip (5), formed integrally with the seal, extends from the seal outer end face (6) and has a hook (7) formed at its free end. Before insertion of the hook into a groove (4) on the seal contact surface to form a tube section, approx. half of the elastomeric strip is coated with a lubricating cpd. (8). ADVANTAGE - The lubricating cpd. application is easily checked and protected against foreign matter.

Description

The invention relates to a push-in joint, in particular for use in sewer construction, consisting of a sleeve hardened material (concrete, reinforced concrete, synthetic resin or the like); a pointed end of a tube as a plug-in part and one Sealing ring made of elastomeric material Anchoring feet are firmly connected to the base of the socket (integrated plug-in sleeve seal), for sealing the gap between the socket and the spigot of the connected Tube.

Socket pipes, in particular made of concrete or reinforced concrete, are widely used to discharge waste water and rainwater. To seal the gap between the sleeve and the spigot end, sealing rings made of elastomeric material, ie rubber or rubber-like plastic, are provided, although in the more recent development it is preferred to arrange the sealing ring firmly anchored in the socket base (integrated push-in joint seal). Such a seal has the advantage that the sealing ring is already brought into position during the manufacture of the pipe and later only the corresponding parts (spigot end, sleeve) have to be pushed into one another. For this, however, it is necessary that the sealing ring is firmly inserted into a suitable position already during pipe manufacture, so that a shift cannot occur during concreting and stripping. In most cases, it was previously necessary to use an auxiliary ring made of plastic (e.g. styrene plastic) or rubber as a formwork element, which was also used as a protective ring when transporting and storing the socket pipe. The importance of this auxiliary ring in the manufacture of a socket pipe is underpinned by numerous publications, the following references only showing a limited selection of the entire state of the art in this regard:
DE-C-21 40 546, DE-A-22 52 089, DE-C-22 66 044,
DE-C-29 35 392, DE-A-31 36 183, DE-A-34 22 483,
DE-C-35 07 909, DE-A-36 17 466, DE-A-36 24 831,
DE-A-36 38 547, DE-A-38 08 450, DE-U-84 25 094,
DE-U-90 04 616.

There are now a few push-in joint seals has been developed in the manufacture of the pipe socket Can be concreted in without using an additional auxiliary ring are (DE-C-33 45 569, DE-A-41 08 851).

With the previous systems, it is necessary for easy Connection of spigot end and sleeve on the construction site sliding medium to use. The lubricant is applied by hand or with applied with a brush, now from the care of the Application of the lubricant strongly depends on the assembly is. Working on shafts in particular can be a problem suspended loads.

Sealing profiles with a closed sliding jacket are known (EP-A-00 11 991). The disadvantage is that the condition of the lubricant and its distribution in the sealing ring don't get checked.

Sealing profiles with an open sliding vane, on the other hand, show that Disadvantage that premature dirt in the sliding area can penetrate and when inserting appropriate obstacles must be overcome. In extreme cases it can even the seal is damaged.

The object of the invention is therefore to provide a profile geometry create that does not have the above disadvantages. Solved this task is accomplished by the arrangement according to the mark of claim 1.

The actual main seal, with particular reference to the Profile structure according to DE-C-35 07 909, DE-U-90 04 616 and DE-A-41 08 851 is then referred to the lower sleeve pulled up, with the lubricated hose inserted into the curve of the lower sleeve. This is still going through supports a certain preload of the seal, whereby the hose lies flat and tight.

The elastomer strip has a small barb, after hardening of the concrete and after removing the Underseal ensures that the strip stretches all over Circumference lies against the concrete and so a trouble-free insertion of the top end becomes possible.

When the spigot ends the hose at the slant of the Main seal recorded via friction, the one mentioned The barb is torn off and the hose stands for the lubricated insert available.

If necessary, the condition of the lubricant or its Distribution on the elastomer strip in front of the pipeline assembly can be checked by pulling it out of the skin seal is snapped off.

During the insertion of the pointed end in the sleeve on the one hand the main seal is pressed and on the other hand the Elastomer strips in the empty space behind the main seal transported. The empty space is marked by a corresponding one reusable thread profile (DE-U-90 04 616) or by appropriately dimensioned cavities of a one-piece Seal (DE-A-41 08 851) held.

The invention is now based on exemplary embodiments explained with reference to schematic drawings. Show it:

Fig. 1 a sealing ring (1) with anchor feet (2, 3), a groove (4), with an elastomer strip (5) which is connected with the sealing ring part (6) and having at its free end a barb (7) as well as with a lubricant ( 8 );

Figure 2 shows the formation of a hose ( 9 ) by inserting the barb ( 7 ) in the groove ( 4 ).

Figure 3 shows the manufacture of the push-in joint with the aid of the auxiliary ring ( 10 ) as a formwork element (DE-U-90 04 616) and the lower sleeve ( 11 );

Figure 4 shows the push-in socket connection in the operating state, consisting of the sleeve ( 12 ) with end face ( 13 ), the tip end ( 14 ) of a tube as a plug-in part and the sealing ring ( 1 ) with hose ( 9 );

Fig. 5 shows a one-piece sealing ring ( 15 ) according to DE-A-41 08 851 with the elastomer strip ( 16 ) according to the invention.

Within the scope of the exemplary embodiments, the elastomer strip also has an additional barb ( 17 ) which can be torn out, reference being made in particular to FIGS . 3 and 4 with regard to its function.

Claims (2)

1. Push-in socket connection, in particular for use in sewer construction, consisting of

• - A sleeve ( 12 ) made of hardened material (concrete, reinforced concrete, synthetic resin or the like);
• - A spigot end ( 14 ) of a tube as a plug and
• - A sealing ring ( 1 , 15 ) made of elastomeric material, which is firmly connected to the base of the sleeve by means of anchoring feet ( 2 , 3 ) (integrated push-in sleeve seal), for sealing the gap between the sleeve and the tip end of the connected pipe; characterized in that
• - The sealing ring ( 1 , 15 ) has a co-extruded (possibly by coextrusion) elastomer strip ( 5 , 16 ) which is connected to the face of the sleeves ( 13 ) facing the sealing ring part ( 6 ) and the free end of which Barb ( 7 ) is provided, the elastomer strip before the barb is inserted into a corresponding groove ( 4 ) in the profile surface with simultaneous formation of a hose ( 9 ) about half of which is coated with a lubricant ( 8 ) (integrated lubricant).

2. push-in socket connection according to claim 1, characterized in that the elastomer strip ( 5 , 16 ) has an additional barb ( 17 ) which can be torn out.