SE445474B - Method for creating glued joints between construction sheets - Google Patents

Abstract

Sheets for the dressing of walls, roofs, etc. are mounted at an early stage of building construction. Therefore, the jointing of the material must be so elastic that it can absorb the dimensional changes that arise due to uncontrollable climate changes before the building is completed. The joints must also be both strong and rigid in the completed building so that cracks and creases do not form in wallpaper or the like during normal seasonal moisture changes within the building.This invention provides a joint that fulfils the need of being very elastic in the beginning and later hardening. It can also be applied at any time and is heat insulating. The method is unique in that an elastomer-type glue is pressed into open joint crevices of a specific width in a specific manner and the glue has a low concrete content, whereby an elasticity-increasing cavity is formed as the glue dries.

Description

8107403-1 it cannot follow hygroscopically conditioned dimensional changes in the boards and the frame of the house during the construction period, and then large that the discs dent and never return to full plan- hot. An advantage of the shaft joint, on the other hand, is that it is immediately controlled ka, which increases the wall's ability to withstand diagonal loads wind forces etc.

One would like a joining method that did not require special design of the edges of the discs as the disc formats rarely fit sar exactly to the length of the wall surfaces without forcing to cut on. construction the place, whereby the sheet piling is lost.

It would also be desirable for the joint to be complete alternatively directly during assembly or later, which gives flexibility work and the opportunity to take advantage of a suitable climate.

The local thickness increase that understands-understanding joint strips and putty causes in the original only nailed joints are swearing and the method as a whole laborious.

However, if the adhesive is to be applied at an early stage, _ it must give a highly elastic joint because it should be able to record dimensional changes of usually 1.2 m wide discs, which move hygroscopically a few mm during the construction period. On the other hand, the joint must be hard when the house is ready, because nars, moisture-induced movements will cause cracks or wrinkles in the wallpaper. I Also from a stability point of view, one wishes strong, rigid joints that provide full cooperation with entire wall sections.

The problems reported above are accentuated if the house is built provided by prefabricated blocks, which are to be joined on the place. In the joints, very large forces can arise during humidification. shifts. Ordinary nail joints are admittedly strong in nature but has poor rigidity, i.e., deforms considerably under load.

In the block joints, an elastic but successive one is needed from the beginning stiffening joint that reaches high strength.

In this context, it should be added that one normally always tries design adhesive joints so that the adhesive absorbs shear forces and does not forces. If a joint is expected to be subjected to tensile stresses, one can reduce the specific stress and give it the nature of shear around the joint e.g. designed as the aforementioned shaft and Half in-half 'or as a so-called finger joint, where the adhesive surface usually becomes at least 6 times larger than the material's own cross section. 8107403-1 It is therefore surprising that splicing of slices according to the present invention consists of a straight adhesive joint subjected to direct take tensile and compressive forces. How this can be practically appropriate shall be requested to be written: The discs are mounted from the beginning with light nailing and open joint cracks of a few mm width. It can be weighed against the width of the discs, whereby the rule of thumb is 2 - 3 mm joint width per m board width. Deviation looks can be justified. ' Immediately after the discs are set up, grouting can be performed but is postponed with advantage until the house has begun to dry out. When impres- an elastomer of the type elastomer, which can be a solution or dispersion of neoprene, thus a rubber type solid material. At freezing temperatures, adhesives with organic solvents means the advantage of being frost-proof, otherwise the types of adhesives dispersion also good to use.

The joint gap should normally be completely filled, thus all the way to underlying wall rule, beam etc. It can be difficult to achieve this with the tip of a standard hand-fed glue cartridge. If the however, be equipped with a perforated washer that can slide over the joint crack and form a kind of putty that prevents the glue from flow freely but presses it deep into the joint, then one is easily achieved total filling with glue.

The washer may have a small heel on its sliding surface against the disc guide in the joint gap in front of the point where the glue is injected. The tray then has the triple function to facilitate the control in the joint line, enable a certain overpressure of the adhesive so that it is driven in deep in the joint gap and serve as a leveling filler.

The joint width is acc. above e.g. 2 - 3 mm, joint depth at least 9 mm (cladding board thickness). Such a section; e.g. 3 x 12 mm, well-filled with an ever-so-elastic glue offers a highly significant resistance to any kind of deformation. Moisture swelling discs could not significantly compress the solid adhesive joint without rather the actual dent out. During drying and shrinkage, tension also become harmful.

The finesse with joints acc. the invention, however, is that the adhesive when applied must contain as much solution fl or dispersion as that the joint does not become solid after drying. If fixed the mass content is 50 - 70%, normally about 60%, departs quickly so large 8107405-1 amounts of liquid partly to the cut surfaces of the wall panels and partly to the material behind the joint and to the open air in front, that it reduced adhesive volume is no longer able to completely fill the joint gap but forms a central cavity. The one from the beginning is rectangular the adhesive section thus takes the form of a flattened hose, glued to the side surfaces of the joint and the backing material (wall rule etc.). The center consists of a cavity.

Such a hollow joint is many times more elastic than a solid one, and easily follows the moisture movements the discs may have, while the adhesive now has its full softness and elasticity left. Another advantage of the joint is that it does not constitute a local cold bridge, as on it the finished wall would soon be marked with a darkening stripe as nail heads are usually marked as stains on wallpaper.

You can compose elastomer lirn in different ways, but everyone has they common, that they remain to some extent elastic without therefore crawl ('cold float') under permanent load. The glue hardens admittedly when solvent or dispersion liquid is released, but this process is often slow due to the solid material considerable density against diffusion. When the adhesive surfaces against the open air or adjoining building material dried, adhesive flange remains softly for. This delay effect in combination with the above described the formation of voids gives the invented joint a high degree but time-consuming calming elasticity. The effect can be regulated in several ways, primarily by changing the solids content and the nature of the solution or dispersants. Of course, the suction of the affected building boards, etc., and in doing so can a suitable selection or a preparation happen. F. över. 'there is the possibility to use glue which is already given a porous structure during the preparation, i.e. content of small air bubbles.

In summary, the invention thus means that the joint The application must be made with an elastomer-type adhesive, which is applied in a few mm wide joint cracks directly after the disc set or at any time later until the wallpapering. The injection of the glue in the joint kaniske with pointed glue cartridge, and this may advantageously be equipped with a perforated small pressure plate, which partly controls the movement along the joint, and partly allows the glue to is carried in the joint gap with a certain overpressure and finally smooths 8107405-1 the surface like a putty knife. Furthermore, the adhesive must have such a low content, usually about 60%, that the initially filled joint receives one or more cavities in its section, when the adhesive dries and releases its liquid content. The glue should then gradually harden and achieve such strength that the joint is able to absorb the ordinary ones swelling and shrinking forces - hygroscopic or thermal - which occurs seasonally in normal houses.

The primary feature of the invention is that the joint is made with glue which thanks to its initially great elasticity and blistering on drying gives sufficiently elastic joints. climate variations of the present time but gradually hardens to that strength and rigidity required in the finished house.

Claims (4)

8107403-1 Patent claims A method of making glued joints between building boards or elements, wherein adhesive of the elastomer type is pressed into open joint gaps and there temporarily forms very elastic joints, which allow large joint movements during the construction phase but gradually harden while the building dries and reaches its intended climatic equilibrium. due to the fact that the adhesive before pressing is given a solids content of 50-70%, preferably about 60%, whereby voids are formed in the joints during drying, whereby elasticity and insulating ability are improved. Method according to claim 1, characterized in that the joints are given a width of at least about Z mm and should normally be about 2 - 3 mm per m width of adjacent boards. 3. A method according to claim 1, characterized in that the adhesive is pressed into the joint gap through a nozzle with approximately the same width as the gap and that the nozzle at its tip is equipped with a perforated washer, which slides and seals against the free surface of the joint, when the nozzle runs along the joint. 4. A method according to claim 3, characterized in that the sealing washer is provided with guide lacquer which is allowed to run in the still-filled joint gap and thereby controls the nozzle.