Arrangement for sealing pipe connections for refrigerant flow on concrete bodies using elastic adhesive sealant sleeve

Abstract

Arrangement for sealing metallic pipe connections consisting of a media pipe (3) with or without insulation (2) and an externally enclosing sheet metal jacket (1) in concrete bodies (4) for the refrigerant flow, characterized in that the area of ​​penetration of the media pipe (3) into the concrete body (4) is tightly enclosed with a permanently elastic adhesive sealant sleeve (5) and the insulation (2) and the sheet metal jacket (1) are located above this.

Description

[0001] Pipelines in concrete bodies, e.g. for the passage of refrigerant for the purpose of cooling the concrete elements, are used, for example, for the icing of luge and bobsleigh tracks.

[0002] To do this, the concrete elements of the track are cooled using a refrigerant with a temperature of up to -16°C, which flows through the meandering pipe coils embedded in the concrete elements. Humidity precipitates on the cold surface of the track and forms an ice crust. The connecting pipes, through which the refrigerant flows into the concrete elements, are insulated with technical cold insulation, usually a polyurethane foam with a sheet metal sheath. When installed according to standards, this cold insulation is diffusion-tight and dimensioned to prevent moisture from condensing. This means that neither precipitation nor condensation can damage the pipes beneath the insulation.

[0003] However, experience has shown that there is a small area of 1 to 10 mm at the connection to the concrete element where technical cold insulation is ineffective because it cannot be bonded to the concrete element in a diffusion-tight manner. Rainwater can still be easily drained away with appropriate flashing, but humidity "creeps" through every crack and settles in the area where the pipe penetrates the concrete element, with all the negative consequences (formation of an ice crust, destruction by the growing ice crust, corrosion, and rust growth that damages the concrete around the pipe).

[0004] The area in the immediate vicinity of the pipe is subject to heavy stress due to: - different thermal expansion coefficients of pipe and concrete - Temperature differences between pipe and concrete - Corrosion of steel pipes in the connection area due to penetrating water or condensation of atmospheric moisture

[0005] This causes damage to the pipe / concrete interface when the pipe is connected to the concrete element.

[0006] The invention aims to prevent damage and leaks in the area where the pipe enters the concrete element. This is achieved by enclosing the section where the pipe enters the concrete with a permanently elastic adhesive sealant sleeve. This prevents penetrating moisture from precipitation or the air from accumulating there.

[0007] The adhesive sealant of the sleeve adheres to both the medium pipe and the concrete element, so that no gaps remain.

[0008] A permanently elastic adhesive can be used as an adhesive sealant, which can withstand the operating parameters (temperatures), forms an adhesive bond with the concrete element and the pipe and is UV-resistant and permanently elastic.

[0009] For this purpose, an SMP (silane-modified polymer) adhesive is preferably used as an accelerated 2-component variant, which is applied to the cleaned substrate surface of the concrete and the metal pipe. Substrate preparation is carried out according to the manufacturer's instructions; loose material such as rust or deposits must be removed. The elastic seal is formed using a split, rotationally symmetrical plastic mold. The SMP adhesive is poured into the two mold halves. The mold is positioned at the connection point. Once the adhesive has fully cured, the mold is removed.

[0010] The result is an adhesive sealant sleeve at the connection point, which is firmly bonded to both the concrete body and the service pipe. The insulation, such as PU foam, is then applied to the elastic adhesive sealant sleeve.

[0011] The arrangement is in Fig. 1 (principle diagram) is explained. Legend for Figure 1 1 sheet metal jacket 2 Insulation PU foam 3 Media pipe 4 concrete elements 5 adhesive sealant sleeve

Claims

[1] Arrangement for sealing metallic pipe connections consisting of a media pipe (3) without or with insulation (2) and an externally enclosing sheet metal jacket (1) in concrete bodies (4) for the refrigerant flow, characterized by that the area where the media pipe (3) penetrates into the concrete body (4) is tightly enclosed with a permanently elastic adhesive sealant sleeve (5) and the insulation (2) and the sheet metal casing (1) are located above it. [2] Arrangement for sealing metallic pipe connections from a media pipe (3) without or with insulation (2) and externally enclosing sheet metal jacket (1) in concrete bodies (4) for the refrigerant flow according to claim 1, characterized by that the adhesive sealant is a silane-modified polymer as an accelerated 2K variant. [3] Arrangement for sealing metallic pipe connections consisting of a media pipe (3) without or with insulation (2) and externally enclosing sheet metal jacket (1) in concrete bodies (4) for the refrigerant flow to claims 1-2, characterized by that the cuff is shaped using a split, rotationally symmetrical shape.

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