FR2548708A1 - Dressing seal with interlocked muff - Google Patents

Abstract

The seal has a seal ring (5) and a fixing projection (10) in the peripheral direction of the ring zone which faces the internal face of the concrete wall (1). The projection is inbedded in the concrete during its casing. The seal has a collar (7) thinner than the ring and applied to the concrete internal face (6) between the ring and the concrete stop. Viewed from the thin end, the fixing projection is in front of the sealing ring deformation part. The collar is behind this deformation part, while a rib like turning bearing piece (12) projects radially inwards from the collar.

Description

Socket sleeve seal
for concrete pipes with one element
seal attached to the pipe bell
The present invention relates to a sealing sleeve with an error sleeve :: limp -po # r concrete pipes comprising a sealing element of elastomeric material which is fixed on the pipe bell, and which has a ring of deformable seal and at least one fixing connector extending in peripheral direction in the region of the seal ring on its side facing the interior wall of the 'oche and molded in said wall of the bell, said fitting being provided with a collar having a thickness thinner than the sealing ring # tee and coming to bear against the internal wall of the bell in the region between the sealing ring and the horizontal bottom surface from the bell.

A socket sleeve packing of the type described above is known in principle as a sliding ring packing according to the patent application of the FRG published under the number DE- OS 31 36 315. The advantage of a sealing element # edite of this type, provided with a collar covering the inner wall of the bell, lies essentially in the field of manufacturing technique, since of the extraction of the sleeve under ja ~ nt after setting, but however before the complete hardening of the concrete, no breakage can occur. As the dimensional rigidity of the sealing element depends on the choice of the material of the aptitude for the deformation provided for the sealing ring, the cavity delimited during concreting by the collar at the rear of the sealing ring is crushed when the concrete is poured when it is not taken not to support the collar during the called concreting by a removable molded ring so that it supports the pressure directed inwards which is exerted radially during the filling process. In addition, the molded rings to be incorporated have the effect of increasing not only the costs involved by the cost of materials, but also of labor costs during the manufacture of this type of pipes
The object of the invention is precisely to produce a sealing sleeve with an interlocking sleeve of the type described above at the start which makes it possible to perform a concrete pouring without resorting to molded parts which have to be incorporated in an additional manner.

 The aforementioned objective as well as others which will appear better in what follows are achieved according to the invention by the fact that the fixing connector is arranged by observing it in the direction of insertion of the male end, downstream of the part of the sealing ring intended to undergo a deformation and that is provided on the collar, looking in the driving direction, at a certain distance behind the part of the sealing ring intended to undergo a deformation, at least one peripheral support element conformed substantially in strip or bar mode and directed radially inwards. The invention is based in this regard on the discovery that the fixing of the sealing element in the bell does not only matters during the time of storage, transport and for the assembly process, i.e. the insertion of the male end of the pipe into the bell.

Thanks to the arrangement, in accordance with the invention, of the fixing connector, it follows that the forces exerted during assembly on the part intended to undergo a deformation and intended to be absorbed by the bell do not manifest themselves immediately. first that in a region of the bell which is not weakened by a decrease in the cross section.

As during storage and transport, there is practically no effect on the sealing element, the resistance of the anchoring of the sealing element in the concrete via an appendage in the form of a strip or rib is entirely sufficient for fixing. For the assembly process, it is only necessary to use essentially the shearing forces exerted by the appendage in the form of a strip, so that the absorption of the load does not take place exclusively through the concrete, but that this rod-shaped appendage is still supported by the collar of the fixing element which comes to be applied against the wall of the bell, so that during the insertion of the male end of the pipe no local offset of the The sealing element is not to be feared. As a result of the provision of at least one support element, it is above all ensured that the pressure of the concrete exerted radially inwards on the surface of the collar at during the concreting process is deflected on the underlying interlocking sleeve and as a result, deformations of the collar are practically prevented, while there is free space necessary for the deformation of the ring sealing. The support element in the form of a strip makes it possible in this case also to adjust for the collar and said support element the elastic properties of the composition of the material used exclusively on the technical sealing requirements imposed on the part of the lining. intended to undergo a deformation.

 In a preferred embodiment, provision is made for the collar to extend into the region of the horizontal bottom surface of the bell and is delimited in this region by a support element in the form of a strip. This results in an impeccable transition between the sealing element made of an elastomeric material and the horizontal bottom surface of the bell made of concrete. In a preferred embodiment, it is further provided in this respect that the collar advances in the form of a lip in the region of said terminal element or closing element delimited at the bottom of the bell and is located higher than the sealing ring in the direction of the axis of said bell. This has the advantage that the sealing element threaded onto the underlying sleeve before concreting is made perfectly tight vis-à-vis concrete penetration due to the presence of its cavity covered by the collar.

In another embodiment of the invention, it is provided that the support element is inclined according to ----------------- the direction of insertion. As a result, additional centering is obtained when the male end of the pipe is inserted or pushed in, also behind the part intended to undergo deformation.
In a preferred embodiment of the invention, it is further provided that the part of the sealing ring intended to undergo a deformation and the support element are each provided on their free edge with an appendage in thin-walled lip mode which is oriented angularly with respect to the horizontal bottom surface of the bell and the free end of which bears against the respective immediately following support element, namely the intermediate support element and the terminal support element. This embodiment offers technical advantages both for use and for manufacture. The technical advantage of use lies in the fact that after the concrete pipe is finished, during storage and assembly, it cannot enter the free spaces delimited by the part intended to undergo deformation and the supporting elements in the form of a strip as well as the closing closing element which comes to apply at the level of the bottom surface of the bell, no foreign body which could impede the free deformability as well of the part of the ring d sealing intended to undergo a deformation than that of the support strips during the introduction of the male end during assembly This results in always perfect positioning of the seal even under unfavorable conditions of storage, transport or mounting and thus sealing. perfect of the sleeve assembly is also ensured.

 Although it is basically possible to produce a profile of this type having a cross section in closed chamber mode, the arrangement in accordance with the invention of an appendix in thin-walled lip mode, angularly folded in place of the part intended to undergo deformation and of the supporting elements, represents an important simplification of the manufacturing technique, since a profile having a cross section of this type can be produced as an extruded product by means of a flat die normal Expensive molding or the like are eliminated in this respect, so that a favorable flow of the material is also obtained through the flat die. As is generally the case with these types of sealing elements a material having the elasticity of rubber which is still subjected after the forming to a vulcanization process, this results in this case the advantage that the free ends of the appendages in lip mode are applied respectively in the raw state in the region of the free end of the adjacent support element and of the adjacent closure end element and are rigidly connected to these during the successive vulcanization phase Consequently, despite the use of an open flat die, consecutive chambers occur, however easily deformable in the longitudinal direction of the extrusion profiles, respectively between the part intended to undergo a deformation and a support strip as well as between the respective neighboring support strips.

 In one embodiment of the invention, it is provided that the fixing connector is formed essentially by the presence of a groove formed in the molding in the sealing element in the region of the sealing ring on the side. of said element facing the inner wall of the bell.

This arrangement of the sealing fitting has the advantage that in the region of the wall of the bell is formed by the concreting process a fitting in the form of a strip which enters the sealing element by fixing it in the Bell. It is further preferably provided in this case that the groove has an inclination oriented against the driving direction. This has, on the one hand, an advantage as regards the manufacturing technique, since it is thus ensured that during the manufacture of the pipe, the concrete introduced into the mold in the direction opposite to the subsequent driving direction, can penetrate by the top in the groove and, on the other hand, it is certain that no air inclusion remains in this region. For the mounting process, this arrangement has the advantage that the sealing element is supported in the direction opposite to that of driving in through the concrete filling the groove, and thus a "rejection" is avoided under the effect of the longitudinal forces produced during the driving in of the male end. An arrangement of this type, of the fixing connector, also has the advantage of manufacturing the sealing element according to the pressure extrusion process, that the extrusion product leaving the molding die lies flat. on the conveyor member, in general a conveyor belt, and can thus be brought into the vulcanization zone without deformation. This applies in particular to embodiments in which the part intended to undergo deformation and the support strips are respectively provided with appendages in angularly folded lips mode to cover the free spaces between the part intended to undergo a deformation and a support strip. A perfect abutment of the free ends of the appendages in lip mode against the contiguous support strip is consequently ensured, so that the subsequent vulcanization results in a rigid connection between the parts in contact.

 In another embodiment of the invention, it is provided that the fixing connector is conformed so as to have a rib of cross section in particular trapezoidal and that it projects, as known per se, from the surface of the collar opposite to the support elements, and between the fixing connection and the terminal edge of the collar is provided on the surface of the collar a support foot of a low height extending parallel to the fixing connection . This support foot is actually also embedded in the concrete during the incorporation of the sealing element in the concrete, thereby promoting the anchoring of the sealing element in the bell. place of importance from the point of view of the manufacturing technique, because as a result of the presence of this support leg and despite the fixing connection projecting from the surface of the collar, said collar cannot be bent at the output from the molding die to come to rest on the transport member, but on the other hand retains its essentially flat shape.

Other characteristics and advantages of the invention will emerge more clearly on reading the detailed description which will follow from a few embodiments given by way of indication, but in no way limiting, with reference to the appended drawings, in which
FIG. 1 represents a view in partial longitudinal section of the bell of a concrete pipe with incorporated sealing element and provided with an underlying sleeve
FIG. 2 represents a view in longitudinal section of a sealing element provided with a support element of a different conformation; and
Figures 3, 4, 5 and 6 respectively represent other embodiments of the sealing element.

 In the case of the bell 1 of a concrete pipe, shown in partial longitudinal section in Figure 1, the underlying sleeve 2 necessary for the development of the inner contour of the bell, is not yet removed. A sealing element 3 of annular shape made of an elastomeric material which is incorporated into the concrete and which remains rigidly embedded in the bell as a sealing element after the annealing sleeve is fitted before the concrete filling. the withdrawal of the underlying sleeve 2. Observing the sealing element in the direction of insertion of the male end of the pipe (arrow 4), said element has in its upstream region a sealing ring 5 to which is attached a collar 7 of a smaller thickness coming to bear against the wall 6 of the bell.

 Said sealing element 3 is provided on its outer surface facing the inner wall of the bell and in the region of the sealing ring 5, namely upstream thereof looking in the driving direction 4 , a groove 8 in which a corresponding quantity of concrete can flow during concreting. This groove is oriented in a substantially inclined manner against the driving direction 4, so that when filling the concrete which enters the mold by flowing in the direction of the arrow 9, the formation of inclusions Another advantage is that the upstream part 10 of the sealing element embedded in the concrete is retained by the concrete edge defined by the base of the groove 8 in the direction opposite to that of insertion 4 and that thus a "rejection" is suppressed during the insertion of a male end. The fitting fixing fitting consists essentially of groove 8.

 As the collar 7 has a relatively thin wall thickness, and that on the other hand it exerts in the radial direction on the collar of the great efforts, during the filling of the concrete and during the subsequent vibration, which would have the effect to normally crush the cavity 11 formed between the underlying sleeve 2 and the collar, there is provided in the embodiment shown, on the side of the collar 7 facing the underlying sleeve 2, two support elements 12 and 13 peripherals extending in the form of strips, which support the collar 7 against the pressure exerted by the concrete during filling and vibration and which prevent the deformation of said collar. The spacing between the sealing ring 5 and the adjacent bearing element 12 has, in this regard, at least one dimension large enough so that the deformation volume of the sealing ring 5 can be absorbed once the male end is pressed. The middle support element 12 in this case has an inclination in the driving direction, so that a perfect insertion of the male end is ensured.

The support element 13 delimiting the collar 7 in the region of the horizontal bottom surface 14 of the bell is arranged so that it extends in lip mode. It is in this respect suitably arranged with a greater length in the direction of the axis 15 of the bell, so that it comes to apply with a corresponding pre-tension on the outer surface of the underlying sleeve 2 and that thus a perfect sealing of the intermediate space it is ensured against penetration by pouring concrete
Figures 2, 3, 4 and 5 show longitudinal section views of differently shaped sealing elements, respectively. The embodiment shown in Figure 2 shows in relation to the embodiment in Figure 1 a support strip 12 'which supports over its entire length the end of the collar 7 turned towards the horizontal bottom of the bell, so that there only remains only the free space 11' necessary for the absorption of the volume of deformation of the sealing ring 5.

 FIG. 3 represents an embodiment which corresponds substantially to the embodiment of FIG. 1. The difference in this case lies in the fact that the central strip 12 is arranged in a relatively massive manner and makes it possible to absorb pressures accordingly. in the radial direction during the concreting process. The rear strip 13 extending in lip mode is provided in this embodiment with an additional attachment appendage 16. With this attachment appendage, it is ensured that the collar 7 can not be torn from the bell during the extraction of the underlying sleeve.

 FIG. 4 represents an embodiment corresponding to that of FIG. 1 but in which, however, two intermediate strips 12 are present.

 The embodiments according to FIGS. 1 and 4 represent a cross section essentially in the form of a hook with regard to the sealing ring 5 which is delimited in the direction opposite to that of insertion by a centering surface 17 with essential conformation #ent conical. As during the insertion of the male end into the bell, the nose 18 of the sealing ring is bent in the free space 11 in the direction of arrow 19, the force

Claims (4)

in this case is essentially applied under the effect of the restoring forces exerted as a result. In the case of the embodiment according to Figure 5, the sealing ring 5 is again provided with a conical centering surface 17. The sealing ring itself in this case however has a cross section in bulge or bead mode, so that when the male end is pressed in, the sealing force results from the compression of the molded body in the form of a bulge . The embodiment according to FIG. 6 is shown in the position according to which the sealing element leaves the die in the form of an extruded profile in order to be applied to the conveyor belt 20. This profile again has a part intended to undergo a deformation or a sealing ring 5 to which is attached a collar 7 intended to be applied by its bearing surface 21 against the wall of the bell. On the side of the collar 7 remote from the support surface 21 are again provided two support elements 12 in the form of a strip as well as a terminal or closure element 13 ending in the region of the horizontal bottom of the bell. In the region of the closing element is in turn provided an additional fixing appendage 16. Unlike the embodiments described above, the support elements 12 in the form of a strip as well as the part 5 intended to undergo a deformation are respectively provided in the region of their free edges with an appendage 22 in thin-walled lip mode, angularly folded, the free end 23 of which respectively bears against the support element 12 immediately next and against the closing element 13. The appendix 22 in lip mode in this case has respective dimensions such that the connection region, as well as the abutment region, are located slightly below the free edge of the respective support element 12 and closure element 13, so that in each case there remains an edge 24 projecting above the appendix 22. In the case of the part 5 intended to undergo deformation, a free edge 26 protruding above the appendage 22 has a more pronounced thickness to be able to achieve a defined stop of the part 5 intended to undergo a deformation on the counter surface of the male end intended to be pressed. A sealing profile of this type is commonly produced by means of a flat die shaped in a corresponding manner so that during production, the free edges 23 of the appendages 22 in lip mode do not yet come 'apply against the support elements 12 or against the end or closure element 13, This occurs only once the extrusion profile has left the die to come to rest on the conveyor belt In this case, the appendages 22 in the mode of lips with very thin walls collapse to come to bear against the support elements 12 and against the closure element 13. As is preferably used for the manufacture of these types of sealing elements, mixtures of vulcanizable rubbers, the successive vulcanization process has the effect that the free edges 23, first of all pressed loosely, are then linked to the support elements 12 and to the fe element rmeture 13 in the form of strips, so that the final extrudate is shaped in profile mode with chambers. The extrudate is sectioned consecutively at the desired nominal lengths of tube and the sections thus sectioned are then assembled in a common manner to transform them into rings by vulcanization or gluing. In this embodiment, it is essential that the back 21 of the profile has a support foot 27 which has the effect that the collar 7 does not undergo bending when the extrusion profile reaches the conveyor surface 20 but that 'On the contrary, it is practically supported in the extended position, so that once the vulcanization has taken place, a rectilinear appearance of the collar is ensured. The support foot 27 has a height such that it forms, in this region, a support extending along the distance, to the conveyor surface 20, predetermined by the height of the fixing appendage 25, so that the cross section of the profile comes to apply when leaving the die on the fixing appendage 25, the support foot 27 and the free edge 28 of the collar 7 in the region of the closure element 13 and is supported until final vulcanization. The height of the support leg 27 is lower than that of the appendix 25. With the aid of molding dies of more complicated shapes, it is of course also possible to produce the cross-sectional profile shown in FIG. 6 in the form of a profile with closed chambers, namely in which the appendages 22 in lip mode are already rigidly connected in one piece during molding, on either side with the support elements 12 in the form of a strip as well as with a support element 12 in the form of a strip corresponding to the terminal closure element 13 and respectively to the part 5 intended to undergo a deformation jointly with the support element in the form of strip adjoining it. ci.To avoid weakening of the cross section of the bell, the support leg 27 can be separated from the extrusion profile as soon as the vulcanization is finished, because it is in fact of essential importance only for the manufacture of tion of the profile itself. Claims  1. Sealing sleeve with interlocking sleeve for concrete pipes, comprising a sealing element made of elastomer material which is fixed on the pipe bell, and which has a sealing ring and at least one fixing connector. extending in peripheral direction in the  region of the sealing ring on its side facing the inner wall of the bell and molded into said wall of  the bell, said connector being provided with a collar having a thickness thinner than the sealing ring and coming to bear against the internal wall of the bell in the region between the sealing ring and the horizontal surface bottom of the bell, characterized in that the fixing connection is arranged, observing it in  the driving direction (4) of the male end, downstream of the part of the sealing ring (5) intended to undergo deformation and that on the collar (7) is provided, looking in the direction of recess (4), at a certain distance behind the part of the sealing ring (5) intended to  undergo a deformation, at least one peripheral support element (12), shaped substantially in the strip mode and directed radially inwards.  2. Sealing sleeve seal according to claim 1, characterized in that the fixing connection consists essentially of a groove  (8) formed by molding in the sealing element (3) in the region of the sealing ring (5) on the side of said element facing the inner wall of the bell (1).  3. Socket sleeve packing  according to claim 2, characterized in that the  throat. (8) is arranged, observing it in the direction  drive (4), downstream of the part of the sealing ring  (5) intended to undergo a deformation.  4. Socket sleeve packing  according to claim 2 or 3, characterized in that  the groove (8) is oriented at an inclination of direction