DE29720084U1 - Shaft made of precast concrete parts with a chemical-resistant lining - Google Patents

Description

Peter Mohr j · · j j · **J ; schacht.sam

Pilatusstraße 6 ....... ... ... ·· · Shaft interior seal

81825 MUNICH

Shaft with chemical-resistant lining

The invention relates to a chemical-resistant lining of the insides of prefabricated concrete shafts in sewage disposal pipelines, as well as in transport pipelines for chemicals or fuels, to prevent damage caused by aggressive liquids or the gases produced by them.

State of the art

Drainage and inspection shafts in pipeline networks are now preferably made of precast concrete elements. These are usually manufactured in accordance with DIN 4034 Part 1 and Part 2. The channels of the shaft bases are often lined with the same material as the connecting pipes. The channels made of stoneware are mainly mentioned here.

Furthermore, manhole bottoms made of plastic to protect the channel and the berm areas are offered by manufacturers such as Preco or Insteel and are installed in the manhole bases in the concrete plants.

However, the rising shaft walls always remain unprotected, so that they are exposed to attack by gases or waste water in the event of backflow in the pipeline.

To avoid such damage, the considerably more expensive shafts made of polyethylene or glass-fibre reinforced plastic (GRP) are used.

Task

The invention therefore aims to provide the precast concrete parts for shafts with a coating of chemical-resistant plastics of varying thickness depending on the load, in order to obtain a level of protection for the interior concrete surfaces similar to that of expensive plastic shafts at a considerably lower cost. A further advantage of this solution is the fact that the flexibility of the concrete shafts is retained when adapting to different construction heights. The specialist knowledge required to move the shafts is largely identical to the technology used for normal concrete shafts.

Peter Mohr I .* * II * ·*�iacgr; ! schacht.sam

Pilatusstraße 6 ·&iacgr;. ·&idigr;.. .S. .!· >* ♦ Shaft interior seal

81825 MUNICH

Description of the invention

To solve the problem in an inventive way, the prefabricated part, which is provided with the inlet and outlet troughs and the continuous channels, is coated in the factory after the concrete has hardened on the inside and front sides with a preferably 1-3 mm thick, sprayed-on protective and sealing layer made of two components plastic, such as polyurethane, polyurea or polyester, the latter also with admixtures of glass fibers.

The shaft rings and the shaft neck are coated on the inside and the two front sides with a fold with the same plastic, but with a thickness of about 1 mm.

To seal the joints and to ensure that the finished parts are supported evenly, a nonwoven fabric is produced, preferably 2 mm thick, into which a material that swells when exposed to water and thus seals is introduced during production. The nonwoven fabric is cut into strips in such a way that they ensure full-surface support on the front sides of the finished parts.

Such textile swelling strips are known from the patent specification DE 29 49 475. Al and are therefore state of the art.

Both ends of this fleece strip are also sprayed with plastic for sealing.

In shafts with prefabricated parts according to DIN 4034 Part 1, the usual sealing ring is also inserted into the joints. Narrower fleece strips are inserted on both sides of the sealing ring.

For finished parts according to DIN 4034 Part 2, only a fleece strip approximately 15 cm wide is inserted.

Description of the drawing

The drawing shows a normal height shaft made of precast concrete elements according to DIN 4034. The shaft parts (3) are coated on the inside and on the front sides with a plastic seal (1).

The coating is thicker in the shaft base (3a) in the berm (5) and the channel (6) due to the higher stress.

The vertical walls of the shaft base (3a), the shaft rings (3b) and the shaft neck (3c) are coated with a thickness of approx. 1 mm.

One wide or two narrower fleece strips (4) are inserted into the joints (2) between the individual prefabricated parts.

Claims (4)

Peter Mohr · .* · · &idigr; * *··&iacgr; ·* schacht.sam Pilatusstraße 6 ·&iacgr;· ·&iacgr;.» ·»· ·&idigr;· «* · Shaft interior seal 81825 MUNICH Protection claims 1) Shaft made of precast concrete parts according to DIN 4034 with a 1-3 mm thick coating of the inner surfaces (1) made of chemically resistant plastic to protect the concrete parts from aggressive liquids and a sealing of the joints (2) between the precast parts (3) with fleece strips (4) into which swelling additives are incorporated at the factory. 2) Shaft according to claim 1, characterized in that the vertical walls of the shaft base (3a), the shaft rings (3b) and the shaft neck (3c) are coated 1mm thick, the berms (5) of the shaft base preferably 2mm thick and the channel or channels (6) 3mm thick. 3) Shaft according to claim 1 or 2, characterized in that the two-component plastic polyurethane or polyurea is used as the material for the coating (1). 4) Shaft according to claim 1 or 2, characterized in that polyester resin with added glass fibers is used as the material for the coating (1). This is followed by a page with a drawing