DE9311801U1 - Combinable butt seal for concrete pipes - Google Patents

Description

Georg Höfig

Wickrather Strasse 120 , 41236 Mönchengladbach

Combinable butt seal for concrete pipes

Butt seals for sewer concrete pipes have been known and in use for years. All newer designs such as rolling rings, sliding rings and rubber or elastomer seals with concreted retaining lips are compression seals which, when elastically deformed, have a resilience that is necessary for the system-related sealing.

These compression seals not only absorb the forces required to maintain a seal, but they also bear the entire shear load of the butt joint. Since both loads partially add up, they can temporarily reach such high values that the resilience of the sealing elements is impaired by relaxation and, if there are undetected hairline cracks, parts of the bell joint occasionally burst open.

In order to reduce this risk, the butt seal aims to reduce the overall load by using smooth-running sealing lips, which allow them to give way when overloaded and transfer the overload to a load-bearing surface support without losing their sealing ability.

This impact seal is available in three different combinations depending on requirements.

Description

1.) The sealing ring 2 made of rubber or elastomer is pulled onto the tip end of the concrete pipe joint 1 under moderate pre-tension. When the bell 3 of the next pipe joint 1' is slipped over, the free-standing sealing lips 4 and 4' are folded over under tension. In the process, they center and form the joint seal through the springy lip contact.

As soon as greater pressure forces load the pressure side seal, the sealing lips on the pressure side spring back further so that the inner wall of the bell at this point rests directly on the load-bearing middle section 5, while on the diametrically opposite side the pre-stressed sealing lips straighten up accordingly and continue to seal. This protects the sealing lips 4 and 4' from any overload.

In addition, the sealing ring 2 has the molded flat seal 6, whose circumferential sealing horn 7 protrudes laterally and provides additional sealing.

2.) This butt seal described above, which is sufficient under normal conditions, can be further improved without any pipe modification if the tightness requirement is increased.

For this purpose, the sealing compound ring 8 made of stiff, plasticizable sealing compound is loosely sprayed on between the sealing lips 4 and 4'. When the bell of the next pipe joint 1' is slipped over, this sealing compound is squeezed out to fit in its actual, contact shape. The excess sealing compound that comes out on the outside prevents sand and small stones from entering.

The remaining reduced ring of rigid sealing compound supports the sealing lips 4 and 4' in addition. If, in special cases, the shear load of the pipe joint exceeds the joint load-bearing capacity, the bell rests directly on the load-bearing middle section 5, as in the first version. Since this is a system that is closed on all sides due to the sealing lips, no sealing compound can escape, but rather it is displaced to the opposite side with its then larger space. The sealing compound therefore also participates in the general sealing agent compensation.

3.) Another combination takes into account the frequently requested request for a re-sealable butt seal.

For this purpose, the sealing ring of the flat seal 6, which is formed from a single piece, receives the sealing agent pocket 9 which has a U-shaped cross-section and is filled with sealing compound.

When the next pipe joint is brought together, the flat surface of the bell housing presses the filled sealant pocket 9 together and sprays the sealing compound inside over the evasive sealing lip 4, and then, after filling the annular free space, the excess also passes through the sealing lip 4*. The excess sealing compound escaping from the outside keeps sand and small stones out.

This design also allows for the resealing of joints that have become leaky in the event of later, more significant ground movements, by piercing the sealant pocket 9 from the inside of the pipe using a known injection device and injecting more sealant. The circumferential pre-groove 10 is provided to achieve a position that is favorable for working. This also serves to accommodate the circumferential, springy sealing horn 7 ♦

The combinable butt seal has the advantage of being able to use a single pipe type for each pipe nominal diameter, as any desired sealing effect can be achieved by fitting the required sealing rings.

If desired, the pipe joints can also be fitted with the appropriate sealing rings at the factory, so that they only need to be put together on site. With the sealing compound taped off, they also provide protection during transport.

Perner: Automatic centering during assembly, which also takes into account certain inequalities in pipe production, thus reducing pipe waste.

Foolproof for the installation personnel, as neither special knowledge nor special care is required.

Can be extended to a large extent while remaining watertight. Can also be installed in wet weather.

Further details and advantages of the invention can be found in the attached drawings. They show:

Fig. 1 a partial section of the spigot end of the pipe joint 1 with a sealing ring fitted in the normal form with a sealing horn running around the side;

Fig. 2 shows a partial section of the (ilock part of the pipe joint 1' ;

Fig. 3 the finished normal butt seal according to Fig.1 and 2 in section;

Fig. 4 a partial section of the spigot end of the pipe joint 1, here in the version with sprayed-on sealing compound ring;

Fig. 5 the finished butt seal with sealing compound It. Fig. 4 J

Fig. 6 a partial section of the spigot end of the pipe joint 1 with the sealing ring fitted^ here in the version with lateral sealing agent pocket;

Fig. 7 shows a partial section of the bell part of the pipe joint 1 ' ;

Fig. 8- the finished butt seal according to Fig. 6 and 7 ·

Claims (5)

Georg Höfig Wickrather Straße 120 , 41236 Mönchengladbach 2 Combinable butt seal for concrete pipes Protection claims 1. Combinable butt seal for concrete pipes, characterized, that the sealing ring (.2) with its circumferential spring sealing lips (.4) and (4*) ₅ and its load-bearing middle section (5) is pulled onto the spigot end of the concrete pipe (1), whereby the sealing lips are pre-tensioned when the bell (3) of the next bore joint (1 ¹ ) is slipped over, so that when a large shear load occurs, the sealing lips continue to yield springily and the inner surface of the bell (3) can fully support itself on the load-bearing middle section (5) of the sealing ring (2) without bringing the sealing lips (4) and (4 ¹ ) to full compression. 2. Combinable butt seal for concrete pipes according to claim ¹ " characterized, that the flat seal (6) formed on the sealing ring (2) and the laterally spring-protruding circumferential sealing horn (7) are attached. 3. Combinable butt seal for concrete pipes according to claim 1, characterized, that the sealing compound ring (8) applied between the sealing lips (4) and (4 ¹ ) consists of plasticizable sealing compound and when slipping over the bell (3) of the next pipe joint (1') according to its inner The excess material can be squeezed out and the remainder can be ejected. 4. Combinable butt seal for concrete pipes according to claim 1, characterized, that the sealing agent pocket (9) filled with sealing compound can be formed on the sealing ring (2) instead of the flat seal (6) and the sealing horn (7) of claim 2. 5. Combinable butt seal for concrete pipes according to claim 1, characterized, that the flat surface of the bell (3) has the annular free groove (10).