DE3618260A1 - Process for restoring concrete tanks - Google Patents

Abstract

The invention relates to a process for restoring damaged concrete tanks, lined with glass sheets, for beverages such as wine, beer, fruit juices or the like. For rapid, reliable and durable restoration, the following process steps are carried out: a) removal of the loose glass sheet material and sweeping out, mopping out or vacuum cleaning of the concrete tank; b) spraying on a mechanically stable two-component polyurethane foam layer, in particular of polyhydric polyether alcohols and polyester alcohols (A component) and diphenylmethane diisocyanate (B component) in two overlapping, 10 to 15 mm thick layers onto the cleaned dry base and the inner sides of the side walls of the tank; c) after curing of the polyurethane foam layer, machining and smoothing the surface of this layer to a layer thickness of 15 to 25 mm and vacuum removal of the abrasion dust; d) applying a low-viscosity epoxy resin solution in at least two operations; e) after curing of the epoxy resin solution, applying a solvent-free, two-component epoxy resin layer with a layer thickness of at least 350 mu . For the restoration of damaged concrete tanks, lined with so-called black-top finish, such as hard asphalt, bitumen or paraffin, for beverages such as wine, beer, fruit juices or the like, after removal of the loose black-top finish material, the black-top finish surface is superficially abraded and vacuum cleaned, before a... Original abstract incomplete.

Description

The invention relates to a method for recovery provision of concrete tanks for drinks such as wine, fruit juices, Beer or the like, with glass plates or with a so-called black coating, such as paraffin, hard asphalt or the like are lined.

Concrete tanks for drinks are, similar to a tiling in Sanitary rooms, lined with glass panels on the inside. These Glass plates are attached to the concrete with a special mortar attached and the joints later with a special Joint filler closed. After a certain usage time these joints are leaking due to cracking, whereby the various causes for this are possible. It can these are shrinkage cracks or settlement cracks or even a direct chemical attack of the wine acid or possibly detergents. Sometimes the glass plate lining also by sterilizing the tanks are damaged by steam of over 100 ° C. The leaks in the joints lead to destruction the mortar and finally to detach the glass plates. After five to ten years of use, ent speaking reasons also lined with black coating Container damaged.

To restore these containers it is from the DE-PS 23 12 770 known, the defective container with noble lining steel sheets. However, this procedure is very labor-intensive and therefore expensive.

The invention is based on the object of a method create with the defective, with glass plates or  Black-lined concrete tanks with little effort can be restored quickly and reliably, so that these salaries regain their function as containers for the intake of drinks and food over years can fully meet beyond.

This object is achieved by the in the Claims 1 and 2 specified method.

First, the loose tank becomes defective clothing material, such as glass plates, mortar, black coating, away. In the case of damaged concrete tanks with black Covering lining is the surface of the black covering to sand with sandpaper or the like. Here the surface acting as a separating layer is removed. After removing the loose material from the tank to be repaired and sweeping or vacuuming this tank is done with a two component spraying system in two spray passes a poly urethane foam layer, for example (Baymer-DS1) from 20 sprayed on up to 30 mm thick (10-15 mm per spray layer). After this polyurethane foam layer has cured, mechanical abrasion by means of orbital grinding, vibration grinders, planes or milling the floor and walls of the tank smoothed. The thickness of the remaining Polyurethane foam layer is 15 to 25 mm. The so smooth tete Polyurethane foam layer is suctioned off and then twice with a low viscosity epoxy resin solution acts. Due to the low viscosity, all Pores of the foam surface reliably sealed. The smooth surface of this primer is such that after this primer layer has hardened, approximately after 3 to 4 Hours, an epoxy resin lining material without bubbles education can be applied. This lining measure material can be sprayed on, rolled up or spread on will.  

In particular that known under the trademark MUNKADUR Epoxy hard lining material is due to its pores freedom, chemical resistance, elasticity and upper surface hardness and surface smoothness suitable.

The epoxy lining material comes in a layer thickness of at least 0.35 mm. The components of this Materials are used to achieve the desired viscosity and reaction heated to about 43 ° C and metered the spray gun fed and mixed and sprayed. Despite the increased reaction temperature of approx. 80 ° C remains on brought lining layer completely bubble-free and ver binds intensively and completely with the rigid foam layer.

The advantages of this method are that internal half of a structurally resilient but leaking concrete tank a dense mirror-smooth plastic inner tank is formed is abge elastic on all sides against the concrete tank is supported. The process is relatively clean, can be quick be carried out and are on the tank to be restored to take only minor preparatory measures. The Plastic inner tank is hardened in a few hours.

The foam material is so stable that after curing ten of the relatively thin MUNKADUR lining layer is walkable. Furthermore, the foam material is like this elastic that settling in the concrete tank from the foam layer can be collected elastically. Because both the foam plastic layer as well as the hard smooth lining layer is applied continuously without gaps, this plastic inner tank offers no bacteriological or chemical targets.

Claims (2)

1. A method for the restoration of damaged concrete tanks lined with glass plates for drinks, such as wine, beer, fruit juices or the like, characterized by the following process steps:

• a) removing the loose glass plate material and sweeping, wiping or vacuuming the concrete tank;
• b) Spraying a load-bearing two-component polyurethane foam layer, in particular from polyhydric polyether and polyester alcohols (A component) and diphenylmethane diisocyanate (B component) in two overlapping, 10 to 15 mm thick layers on the cleaned, dry floor and the inside the side walls of the tank;
• c) After hardening of the polyurethane foam layer, mechanical removal and smoothing of the surface of this layer to a layer thickness of 15 to 25 mm and suction extraction of the grinding dust;
• d) applying a low-viscosity epoxy resin solution in at least two operations;
• e) After the epoxy resin solution has hardened, apply a solvent-free two-component epoxy resin layer in a layer thickness of at least 350μ.

2. Method for restoring damaged concrete tanks for beverages lined with so-called black coating, such as hard asphalt, bitumen or paraffin, for beverages, such as wine, beer, fruit juices or the like, characterized by the following process steps:

• a) removing the loose black coating material, grinding the black coating surface and vacuuming;
• b) Spraying a load-bearing two-component polyurethane foam layer, in particular from polyhydric polyether and polyester alcohols (A component) and diphenyl methane diisocyanate (B component) in two overlapping, 10 to 15 mm thick layers on the cleaned, dry floor and the inside of the side walls of the tank;
• c) After hardening of the polyurethane foam layer, mechanical removal and smoothing of the surface of this layer to a layer thickness of 15 to 25 mm and suction of the grinding dust;
• d) applying a low-viscosity epoxy resin solution in at least two operations;
• e) After the epoxy resin solution has hardened, apply a solvent-free two-component epoxy resin layer in a layer thickness of at least 350μ.