SE435946B - SET AND DEVICE FOR DRYING A MOISTURIZED AND WATER DAMAGED FLOOR COVER - Google Patents

Description

82063M '-5 10 15 20 25 30 35 2 Pig. 4 shows on a larger scale an injection needle for air.

The floor shown in Fig. 1 gives an example of a floor support type which, in the event of moisture and water damage, has previously seldom been able to be restored without breaking up the entire floor. The base layer 1 itself consists of a concrete slab resting on an insulating layer 2 of e.g. glow-sawn and thus substantially waterproof and diffusion-tight cellular plastic, which in turn rests on a drainage layer 3 in the ground. A leveling sand layer 4 is arranged on top of the concrete slab 1. On this rests in turn the floor 5, e.g. made of chipboard or parquet boards.

A diffusion-tight foil 6 can be arranged between the filling consisting of the sand layer H and the floor 5. The spaces between the sand grains of the filling as well as the space between the foil 6 and the floor 5 form air-permeable layers in the horizontal direction.

A floor of this type can absorb significant amounts of water in the event of water damage. The concrete slab 1 can be completely soaked with water and there can also be water both below and on top of the slab.

To enable drying, a plurality of small holes 7 are drilled through the floor 5 down to the filling 4. These holes are intended to be used as supply openings for drying air to the filling. Exhaust openings for exhaust air from this air-permeable layer are arranged by removing the floor plinths, whereby air gaps 8 are generally obtained with the walls delimiting the floor 9 in the room without further measures.

In essentially each of the holes 7, an air injection needle 10 of sufficient length is inserted to insert into and approximately through the sand layer U. The holes 7 are distributed over central parts of the floor surface and arranged in several parallel rows. They are suitably arranged in each row with a pitch of 10-50 cm, preferably about 15 cm. The diameter of the holes need not exceed 2 mm, since the needles 10 are suitably made of tubes with a maximum of this diameter.

Pig. 4 shows in more detail how such a needle has its upper, open end inserted in the pipe wall of a hose 11. The pipe wall of the needle is in turn provided with some holes 12 distributed in the axial direction as outlet openings for drying air at different levels in 10 15 20 25 30 35 8206321-5 3 the sand filling 4. The length of the needles 10 and the number of heels 12 are adapted to the current work object. The lower ends of the needles do not have to be open. A hose 11 is arranged along each row of heels 7 in the floor. One is shown in Fig. 1, but on the other hand the hoses have been omitted in Fig. 2.

The hoses 11 are, as shown in the principle diagram, Fig. 3, arranged to be connected to a source of compressed air 13, which delivers dehumidified and also with respect to its temperature treated compressed air.

On the floor surface (Fig. 1) a heater 14 is applied in the form of one or more carpet-like heating pads, which are covered upwards with heat-insulating and preferably reflective material 15, in one piece with the heating pads or designed as separate mats. The heating pads are heated by means of (not shown) internal hot water loops or electric loops.

The actual drying process begins after these preparatory measures with the compressed air flow from the compressed air source 13 with low absolute humidity, preferably about 0.2 g water / m3 air, and significant overtemperature in relation to the floor temperature of the floor support layer being supplied to the sand filling H via the tubes 11 and the injection needles 10. The appropriate temperature is normally 30 á SOOC. At the same time, the floor surface is heated by means of the heater 14 to the same temperature as the compressed air or to a higher temperature, preferably about 10oC higher.

Both this supply of dry and hot compressed air and the floor surface heating are maintained substantially unchanged until the humidity of the air in the filling in the vicinity of an outlet gap 8 has dropped to a predetermined first value.

A relevant measuring point 16 can often be obtained by removing a threshold (Fig. 2). and seeking out a site in communication with the air permeable layer, i.e. the sandfill 4. The predetermined initial value is suitably a relative humidity of 60 - 65%. Below the threshold, it may also be appropriate to drill a hole down in or through the concrete slab 1 for measuring the temperature below it or in it. in the latter case near the underside of the plate. This measuring point can be of value partly to determine the original temperature level and temperature gradient of the floor support and partly to monitor temperature changes at the underside of the concrete slab. It is expedient to ensure that not only the the aforementioned first value for the moisture in the air that has passed the filling is achieved without the temperature at the deeper level also rising to 25 - 3000 before the supply of heat via the compressed air flow and the floor surface is interrupted. The heating and drying process may require a period of some days before the desired values are obtained.

Thereafter, the supply temperature of the still dehumidified compressed air flow is lowered to accelerate the migration of moisture from below to the dried area, i.e. the sand filling H, the floor 5 and the upper part of the concrete slab 1. At the same time, the floor surface heating is interrupted or at least reduced. Preferably, the supply temperature of the compressed air is lowered to the order of + 10 ° C.

The dried and colder compressed air flow is maintained until the humidity under the concrete slab 1 or in the concrete near the underside of the slab has dropped to a predetermined second value, which indicates that the desired drying of the area in or under the concrete has been achieved. Suitably measurements are made of said hole below the threshold.

When the local temperature has dropped to 15 á 17oC and the relative humidity has dropped to cza 70% in this area, pressure in this area can be interrupted by the previous air supply. This cooling process can also take a few days. Should it turn out that the relative humidity after an empirically selected, rather long period of compressed air supply does not fall to the desired level, the entire described heating and cooling cycle is repeated until the desired final state is reached.

In order to achieve as even drying as possible over the entire floor plane, it may further be suitable to vary the flow paths of the compressed air flow in the following manner during the described heating and cooling processes. During at least the initial stages of both processes, the compressed air flow is supplied through all those in the floor according to Pig. 2 occupied 10 15 20 25 30 8206321-5 5 holes 7, whereby for the whole floor plane a flow image of the kind indicated to the left of the dotted line in the figure, i.e. from the center and out towards the edges for departure through all the gaps, is obtained. During the final stages of one or both of the processes, all but one of the slots 8 can then be taped in. If the slot 8 located along the wall with the door opening is left open and compressed air is supplied only through the row of holes 7 furthest from it, for the entire floor plane the flow pattern indicated to the right of the dotted line in Fig. 2. These measures thus obtain a longer flow path for the air flow, which in this case most likely finds other flow paths than before and will flow through previously possibly insufficiently aerated parts.

The room, the floor of which is dried, is suitably provided with temporary, per se known devices for improving ventilation, so that wet air and excess heat are dissipated therefrom.

The device for carrying out the method according to the invention described in part above is schematically illustrated in Figs. The compressed air source 13, which delivers dehumidified and temperature-treated compressed air to the needles 10 via the hoses 11, consists of a compressed air compressor 20 with a pre-cooler 21, a drying device 22 with two alternatively connectable and regenerable drying units, a cooling coil 23 (i a circuit with refrigeration compressor 24) and a heating coil 25 heated e.g. with excess heat from the cooler 21 of the compressed air compressor 21. The mat-like heating pad 14 for heating the floor surface can at least in part be heated with water from the cooler 21 of the compressed air compressor or the condenser of the cooling compressor 24.

Claims (10)

e2os321-s 10 15 20 25 30 PATENTKRAV A method of drying a moisture- or water-damaged floor support layer (1) of concrete together with its associated filling (4) and floor (5), wherein supply openings (7) for an air flow are accommodated in the floor (5) down to an air-permeable layer formed by the filling (4) and outlet openings (8) from this layer are provided, and the air flow is caused to flow through the air-permeable layer until a certain lowering of the humidity of the air at a relevant first measuring point (16) in connection with the air-permeable The layer is provided, characterized by the supply openings (7) being accommodated in the form of a plurality of small holes, a plurality of injection needles (10) connectable to a source of compressed air (13) being inserted into each of the small holes for supplying the air flow in the form of a compressed air flow, ttt a heater (14) arranged for heating the floor surface is placed on or over the floor, A the air flow, with low absolute humidity and significant overtemperature in relation to t At the initial temperature of the floor support layer (1), the air-permeable layer (4) is supplied via the injection needles (10) until the humidity of the air at the first measuring point (16) has dropped to a predetermined first value, while the surface of the floor (5) is heated by the heater ( 14) to the same temperature as the air flow has or higher. An air flow supply temperature is then lowered to accelerate a moisture migration from below to the area of the air permeable layer (4), whereby the floor surface heating is preferably reduced or interrupted, the air flow with the latter to stand is maintained until the humidity under the concrete or in the concrete near its underside has dropped to a predetermined second value, indicating that the desired drying of the area in or under the concrete has been achieved: and that the described heating and cooling cycle is repeated, in which case a moisture reduction to the predetermined second value is absent after a period of time maintaining the air flow with the latter condition. 2. A method according to claim 1, characterized in that the absolute humidity of the air flow during the supply is kept at about 0.2 g water / m3 air. 3. A method according to claim 1 or 2, characterized in that the temperature of the air flow when supplied with the said overtemperature is kept at 30 - 50 ° C and that the temperature on the floor surface is kept about 10 ° C higher. Method according to one of Claims 1 to 3, characterized in that the temperature under the concrete or in the concrete near its underside is also measured and that the air flow with said overtemperature and preferably also the floor surface heating is maintained until the measured temperature rises to a predetermined level. , preferably of 25 - 30 ° C, whereby the temperature of the air flow is lowered only after both the increase to this temperature level and the decrease of the humidity in the first measuring point to the predetermined first value has been achieved, which first value is preferably set to 60 to 65%, measured in relative humidity, and the air flow with the temperature preferably reduced to the order of + 10 ° C is maintained at least until temperature measurement in or under the concrete indicates a temperature decrease to 15 to 17 ° C, the predetermined second value being set to about 70%, measured in relative humidity. Method according to one of Claims 1 to 4, characterized in that the small holes (7) are taken up by drilling and are given a diameter of a maximum of 2 mm and are located in several rows with a pitch of 10 to 50 cm, preferably - approximately approx. 15 cm, between the holes within each row. Method according to one of Claims 1 to 5, characterized in that the humidity of the air in the first measuring point (16) is measured in a cavity below a threshold, which cavity is connected to the air-permeable layer (4) and in that a borehole here is occupied 8206321 * S 10 15 20 h) u »30 35 8 in or through the concrete, which borehole is used for the temperature and humidity measurements in or under the concrete. Method according to one of Claims 1 to 6, characterized in that the small holes (7) are taken up in central portions of the floor (5) and that the air flow is led in one direction outwards and exits through peripheral gaps (8) which are exposed. by the removal of the floor plinths and that this scattering advance is maintained during at least the initial stages of both the air supply with overtemperature and the subsequent cooling by means of colder air, while some of these gaps (8) are blocked, e.g. is taped over, during at least some final stage, the supply of air through the small holes (7) being restricted to only those holes (7) which are located at a large distance from the still open gap (s) (8), so that the air flow is carried a longer distance than before under the floor for the establishment of flow paths through previously possibly insufficiently aerated sections. Device arranged for drying a moisture- or water-damaged floor underlayment (1) of concrete with its associated filling (4) and floor (5), by means of air introduced into air-permeable layers thereof, and comprising a compressed air compressor (20 , 21) equipped with a drying device (22) for the air flow and a cooling coil (23) and heating coil (25) for this, characterized by a separate heater (14) for heating the floor surface and by a plurality of injection needles (10) , which are intended to be inserted through small holes (7) in the floor (5) and arranged to supply the air flow via hoses (11). Device according to claim 8, characterized in that the injection needles (10) consist of tubes, preferably with an outer diameter of max. 2 mm, which tubes have several holes (12) distributed in axial direction in their tube wall. Device according to claim 8 or 9, characterized in that the separate heater (14) consists of one or more mat-like heating pads, which are covered upwards with heat-insulating and preferably reflective material (15) and are heated by means of necessary hot water loops or electric loops.