DE102020206402A1 - Kit for an inspection shaft and seal for such a kit - Google Patents

Abstract

A kit for an inspection shaft has a tubular shaft extension (17), a support ring (30) and a seal (34) which is funnel-shaped and with its inner flow opening (39) into the shaft extension ( 17) opens and its outer edge (40), which is deformed during installation, rests against the inner wall (33) of the support ring (30). The seal (34) has a wall thickness that decreases from the inside to the outside and is made of thermoplastic material.

Description

The invention relates to a kit for an inspection shaft according to the preamble of claim 1 and a seal according to claim 8 for such a kit.

Such inspection manholes made of plastic usually have a so-called composite pipe or, in individual cases, a corrugated pipe as a manhole extension that leads to the manhole cover. Such shaft extensions usually have an inside diameter of about 500 mm and an outside diameter of 590 to 600 mm. The choice of this diameter results from the fact that commercially available manhole covers are used DIN EN 124 , so-called cast concrete covers, on a concrete support ring DIN 4034 be positioned. The support rings after DIN 4034 have an inside diameter of 625 ± 6 mm and can therefore be combined very well with the aforementioned duct extensions.

So that the surface water flowing in via the manhole cover does not run off laterally between the support ring and the manhole extension and thus damage the surroundings of an inspection manhole by flushing out the installation material, a seal is provided that prevents surface water from flowing away between the outer wall of the manhole extension and the inner wall of the support ring should ensure.

Such seals known from the "General Building Approval / General Construction Approval" of the Deutsches Institut für Bautechnik from February 20, 2019, number Z-42.1-473, are designed as flexible rubber seals that are intended to be attached to the upper end of a manhole extension designed as a composite pipe . For this purpose, the ring-shaped seal has an approximately semicircular inwardly open inner holding section which, with elastic deformation, is pulled onto the uppermost wave crest of the composite pipe serving as a shaft extension. A web protrudes outward from this retaining ring, which, when the manhole extension is inserted into the manhole base body, comes to rest with a sealing lip on the inner wall of the support ring. The assembly of this seal is relatively complex, since the seal must be attached to the manhole extension before it is pushed into the support ring. Since rubber seals are very flexible, there is always the risk that such a seal accidentally falls into the inspection shaft and is thus lost.

Another elastic seal made of rubber is made of the "Drainage Systems" catalog from FRÄNKISCHE Rohrwerke Gebr. Kirchner GmbH & Co. KG from 10/2019 known. It has an annular web that can be inserted into the shaft extension and rests elastically there, and an upper annular bead that rests against the inner wall of the support ring. Here, too, it applies that these very flexible rubber elements are difficult to install and, due to their flexibility, can easily fall into the shaft and thus get lost. In addition, rubber elements are usually relatively expensive.

The invention is based on the object of creating a kit of the generic type and a seal for such a kit that is inexpensive to manufacture and easy and safe to assemble.

According to the invention, this object is achieved for a kit according to the preamble of claim 1 by the features in the characterizing part of claim 1 and for a seal by the features of claim 8.

Due to the funnel-shaped design of the seal and its relatively high rigidity due to the manufacture of a thermoplastic material, in particular polyethylene or polypropylene or possibly PVC, the seal is dimensionally stable and is only pushed through the support ring from above to the stop after completion of the inspection shaft pushed along the upper edge of the shaft extension. This completes the assembly. There is no elastic connection of any kind between the seal and the manhole extension. Since the seal is made of relatively stiff plastic, there is also no risk of it falling into the manhole extension. The seal is produced either by injection molding or by additive manufacturing processes, i.e. so-called 3D printing.

Advantageous refinements result from the subclaims.

• 1 einen Inspektions-Schacht nach der Erfindung im vertikalen Längsschnitt,
• 2 eine erste Ausführungsform einer Dichtung nach der Erfindung in unverformtem Zustand,
• 2a die Dichtung nach 2 in eingebautem, verformtem Zustand,
• 3 eine zweite Ausführungsform einer Dichtung nach der Erfindung in unverformtem Zustand,
• 3a die Dichtung nach 3 in eingebautem, verformtem Zustand,
• 4 eine dritte Ausführungsform der Dichtung in unverformtem Zustand und
• 4a die Dichtung nach 4 in eingebautem, verformtem Zustand.

Further features, advantages and details of the invention emerge from the following description of three exemplary embodiments of the invention with reference to the drawing. It shows:

• 1 an inspection shaft according to the invention in a vertical longitudinal section,
• 2 a first embodiment of a seal according to the invention in the undeformed state,
• 2a the seal after 2 in the built-in, deformed state,
• 3 a second embodiment of a seal according to the invention in the undeformed state,
• 3a the seal after 3 in the built-in, deformed state,
• 4th a third embodiment of the seal in the undeformed state and
• 4a the seal after 4th in built-in, deformed state.

The in 1 The inspection shaft shown has a base body 1 which has the shape of an upside-down T in a rough approximation. A first connection sleeve extends upwards as a connection element 2 . At the lower end, a second connecting sleeve extends, as it were, as a transverse web of the T 3 and a third connection sleeve 4th that have a continuous common axis 5 exhibit. The connecting sleeves are at their free ends 2 , 3 , 4th each with an outwardly widening insertion funnel 6th , 7th , 8th Mistake.

That between the connection sleeves 3 , 4th located main body-middle part 9 is at least partially cylindrical in its lower region, namely partially cylindrical to the axis 5 .

On the main cylindrical sections 10 , 11 the sleeves 3 , 4th each is a stand 12th respectively. 13th in the form of an outward from the respective main section 10 respectively. 11 arched web. The lower outer edge 14th respectively. 15th of the respective stand 12th , 13th runs perpendicular to the axis 5 and perpendicular to the central axis 16 the first connection sleeve 2 . Using these two feet 12th respectively. 13th ensures that the manhole base 1 is stable on a level surface during assembly work.

To produce the inspection shaft, the first connecting sleeve protruding upwards is inserted 2 one as a shaft extension 17th Serving composite pipe, also made of plastic, is used, which consists of a substantially cylindrical inner pipe 18th with an inside diameter D18 and a corrugated outer tube 19th with an outside diameter D19 is formed whose wave crests 20th at their respective foot with the inner tube 18th are welded 9. Construction and production of such composite pipes made of plastic are for example from EP 0 563 575 A2 known. Between the wave crest at the end 20th and the neighboring wave crest 20th is one against the substantially cylindrical inner wall 21 the first connection sleeve 2 adjoining seal 22nd arranged. Such seals 22nd are for example from the EP 2 230 359 A2 known.

In the second connection sleeve 3 becomes a line 23 - Usually a sewer pipe - introduced, which is also designed as a double-walled corrugated composite pipe. Between the two wave crests at the end 24 is a seal 25th arranged that like the seal 22nd can be formed. The administration 23 is at its end on a transition section 26th between the second connection sleeve 3 and the main body middle part 9 at. The inner tube 27 the line 23 is flush with that of the interior wall 28 of the main body middle part 9 . The seal 25th lies sealingly on the part of the main cylindrical section 10 the second connection sleeve 3 at that between the transition section 26th and the stand 12th is trained.

The connection of the other line 29 with the third connection sleeve 4th is designed in the same way.

Around the top of the manhole extension 17th is a support ring 30th made of concrete DIN 4034 arranged, in the illustrated embodiment on a support 31 - in the present case also made of concrete - is supported. Between the upper edge of the manhole extension 17th and the cylindrical inner wall 33 of the support ring 30th is an annular seal 34 arranged, which is described in detail below. Above the support ring 30th is a manhole cover 35 provided that one on the support ring 30th supported frame 36 and a manhole cover resting on this 37 exists, which can be designed as a grate, for example a grid grate.

Like that 2 , 3 , 4th is removable, is the seal 34 respectively. 34 ' respectively. 34 " in the undeformed state in each case approximately frustoconical, with a very large opening angle. It educates in accordance with 2a respectively. 3a respectively. 4a on the inside wall 33 of the support ring 30th Adjacent deformation a feed funnel for water coming from above through the cover into the inspection shaft, which the water through a through-flow opening 39 into the shaft extension 17th initiates and prevents it from outside of the manhole extension 17th walks past and flushes the inspection shaft free. Like that 2 until 4a can be removed, has each seal 34 , 34 ' , 34 " an inner margin 38 with an inside diameter D39 on the through-flow opening 39 limited. The seals 34 , 34 ' , 34 " consist of thermoplastic material, especially PE or PP, but also PVC.

In the design according to 2 , 2a takes the wall thickness of the seal 34 outwards continuously, so that the seal 34 is more flexible in its radially outer area than in its inner area. As the seal 34 - like from that comparison of 2 and 2a shows - a larger outside diameter D34 than the inside diameter D33 the inner wall 33 , it becomes when pushed into the support ring 30th up to the system at the top 32 the shaft extension 17th in their outer area in the direction of the manhole cover 35 bent and received - like out 2a can be seen - the shape of a bowl, i.e. a funnel that is no longer frustoconical with through the opening 39 formed open ground. The seal 34 lies with her the outer edge 40 adjacent area with considerable prestress sealing on the inner wall 33 at.

In the design according to the 3 and 3a instructs the seal 34 ' also from the inner edge 38 to the outside a decreasing wall thickness, up to a kink 41 , their diameter D41 is smaller than the inside diameter D33 the inner wall 33 . This is followed by an annular sealing ridge 42 whose wall thickness is significantly less than the wall thickness of the seal 34 ' between the inner edge 38 and the kink 41 . When inserting the seal 34 ' in the support ring 30th becomes this sealing ridge 42 from the kink 41 deformed upwards and lies with its the outer edge 40 ' adjacent area close to the inner wall 33 of the support ring 30th at.

When designing according to 4th and 4a takes the wall thickness of the seal 34 " also continuously from the inside out. The kink 41 is through one on the outside of the seal 34 " provided annular groove formed so that when inserting the seal 34 " in the support ring 30th the sealing bar 42 the seal 34 " in this area bends upwards and then accordingly 4a with its the outer wall 40 " adjacent area close to the inner wall 33 is applied. For the diameter D41 the kink 41 applies to the outside diameter D19 the shaft extension 17th : D19 <D41 <D33.

For the diameter D33 the inner wall 33 applies according to DIN 4034: $$619\text{mm}<=\text{D33}<=637\text{mm}.$$

$$633\text{ mm}<=\text{ D34'}<=636\text{ mm bzw}\text{.}$$

$$633\text{ mm}<=\text{ D34''}<=636\text{ mm}\text{.}$$

To the manufacturing accuracy of ± 1.0 mm of the outside diameter D34 , D34 ' , D34 " the seal 34 , 34 ' , 34 " to be able to compensate and for the entire tolerance range of the support ring 30th a sufficiently secure sealing contact of the seal 34 , 34 ' , 34 " on the inside wall 33 ensure the outside diameter should be D34 , D34 ' , D34 " 2 to 5 mm larger than the maximum diameter D33 the inner wall 33 . The following applies: $$633\text{mm}<=\text{D34}<=636\text{mm or}\text{.}$$

$$633\text{mm}<=\text{D34 '}<=636\text{mm or}\text{.}$$

$$633\text{mm}<=\text{D34 ''}<=636\text{mm}\text{.}$$

und insbesondere $$30\text{ mm}<=\left(\text{D18}-\text{D39}\right)<=20\text{ mm}.$$

Even with asymmetrical installation of the shaft extension 17th relative to the support ring 30th it must be ensured that the flow-through opening 39 all over the inner tube 18th flows out. The following therefore applies: $$\text{D39}<\text{D18}\text{,}$$

and particularly $$\mathrm{30th}\text{mm}<=\left(\text{D18}-\text{D39}\right)<=\mathrm{20th}\text{mm}.$$

The wall thickness of the seal 34 is in its central area, i.e. approximately in the radial center between the edge 38 and outer edge 40 , 3.5 to 5.0 mm.

For the seals 34 ' and 34 " it applies that their thickness is in the radial middle area between the edge 38 and kink 41 3.5 to 5.0 mm. The wall thickness of the sealing ridge 42 respectively. 42 " lies in the middle area between the kink 41 and the outer edge 40 ' respectively. 40 " in the range from 1.0 to 2.0 mm.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 0563575 A2 [0014]
• EP 2230359 A2 [0014]

Non-patent literature cited

• DIN EN 124 [0002]
• DIN 4034 [0002, 0017]
• "Drainage Systems" catalog from FRÄNKISCHE Rohrwerke Gebr. Kirchner GmbH & Co. KG from 10/2019 [0005]

Claims (11)

Kit for an inspection shaft, which has - a shaft base body (1), - a tubular shaft extension (17) with an outer diameter D19 and an inner diameter D18, - a support ring (30), the inner wall of which ( 33) has an inner diameter D33 which is greater than the outer diameter D19 of the shaft extension (17), and - a seal (34, 34 ', 34 "), which has an inner diameter D39 and in the undeformed state has an outer diameter D34, D34 ', D34 "which is greater than the inner diameter D33 of the support ring (30), characterized in that the seal (34, 34', 34") has the shape of a funnel with one of outwardly inwardly inclined wall with an inner throughflow opening (39), for whose inner diameter D39 applies: D39 <D18, the inner diameter D39 of the throughflow opening (39) is selected so that even with an asymmetrical arrangement of the shaft extension (17) relative to the support ring (30) the throughflow opening ( 39) opens over the entire surface into the shaft extension (17), that the thickness of the wall decreases from the inside to the outside and is elastically flexible in the radial outer area and that the seal (34, 34 ', 34 ") consists of thermoplastic material. Kit according to Claim 1 , characterized in that the seal (34, 34 ', 34 ") can be placed against an upper edge (32) of the shaft extension (17). Kit according to Claim 1 or 2 , characterized in that for the minimum outer diameter D34, D34 ', D34 "of the seal (34, 34', 34") in the undeformed state, based on the maximum diameter D33 of the inner wall (33) of the support ring (30): $$2\text{mm}<=\left(\text{D34}-\text{D33}\right)<=5\text{mm or}\text{.}$$

$$2\text{mm}<=\left(\text{D34 '}-\text{D33}\right)<=5\text{mm or}\text{.}$$

$$2\text{mm}<=\left(\text{D34 ''}-\text{D33}\right)<=5\text{mm}\text{.}$$

Kit based on one of the Claims 1 until 3 , characterized in that the seal (34 ', 34 ") has a kink (41) in its radially outer area, for the diameter D41 of which in relation to the outer diameter D19 of the shaft extension (17) and the inner diameter D33 of the inner wall (33) applies: D19 <D41 <D33. Kit based on one of the Claims 1 until 3 , characterized in that the seal (34) has a thickness of 3.5 to 5.0 mm in the radially central area between the flow opening (39) and the outer edge (40). Kit based on one of the Claims 1 until 4th , characterized in that the seal (34 ', 34 ") has a wall thickness in the range of 3.5 to 5.0 mm in its radially central area between the flow opening (39) and the kink (41). Kit based on one of the Claims 1 until 4th and 6th , characterized in that a sealing web (42) is formed between the kink (41) and the outer edge (40 ', 40 ") of the seal (34', 34"), the mean wall thickness of which is 1.0 to 2.0 mm . Seal for a kit according to one of the Claims 1 until 7th , characterized in that the seal (34, 34 ', 34 ") has the shape of a funnel with a wall sloping from the outside to the inside with an inner through-flow opening (39) that the thickness of the wall decreases from the inside to the outside and the wall is elastically flexible in the radially outer region and that the seal (34, 34 ', 34 ") consists of a thermoplastic material. Seal after Claim 8 , characterized in that the seal (34 ', 34 ") has a kink (41) in its radially outer region and that between the kink (41) and the outer edge (40', 40") of the seal (34 ', 34 ") a sealing web (42) is formed, the mean wall thickness of which is smaller than the mean wall thickness of the seal (34 ', 34") between the throughflow opening (39) and the kink (41). Seal after Claim 8 or 9 , characterized in that the seal (34 ', 34 ") has a wall thickness in the range of 3.5 to 5.0 mm in its radially central area between the flow opening (39) and the kink (41). Seal after Claim 9 , characterized in that the mean wall thickness of the sealing web (42) is 1.0 to 2.0 mm.

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