CZ2018601A3 - Jig for coupling foundation structures of buildings - Google Patents

Abstract

The device for coupling the foundation structures of buildings comprises a housing (1) in the shape of a block, which is provided on the sides with guide openings (2) for slats (9) and / or strips. On the inner lower side, a fixed bottom plate (4) is located in the housing (1). At the inner upper side, a movable upper pressure plate (6) is placed in the housing (1), on which a prestressing screw (8) located in a nut (3) on the upper side of the housing (1) rests.

Description

Jig for coupling the foundation structures of buildings

Field of technology

The technical solution relates to the additional strengthening of the foundation structure, especially of historic buildings by means of strips and / or lamellas.

Prior art

Due to the low tensile and shear strength of foundation structures, foundation structures, usually masonry, have insufficient resistance due to the effects caused by changes in the shape of the foundation joint manifested by tensile and shear cracks in the foundation structure and adjacent parts of the above-ground masonry.

There are various methods of rehabilitation of foundation structures, eg by coupling foundations, deepening of foundations, jet grouting, etc. Their common disadvantage is high laboriousness and cost.

The essence of the invention

The shortcomings of the existing methods used for the rehabilitation of foundation masonry structures, especially historic and listed buildings, are eliminated by a technical solution based on the application of prestressed, high-strength lamellas and strips based on carbon fibers and epoxy resin inserted into thin horizontal grooves made by horizontally mounted circular saws in level of foundation structures, or in the masonry of the superstructure immediately adjacent to the foundation structure.

Slats, or belts th. 2 to 6 mm wide 40 to 80 mm are inserted into pre-made grooves in the masonry of a depth of min. 150 mm and heights of min. 30 mm higher than the expected lamella thickness, or carbon fiber belt. In the case of insufficiently load-bearing or partially weathered masonry, it is necessary to increase the depth of the groove, or perform reinforcement of masonry by deep grouting. Slats, or the strips are, after insertion into the grooves and one-sided anchoring with a special metal or plastic anchor, prestressed to the required force, eg 10 to 30% of the characteristic masonry load-bearing capacity, or 30% of the existing masonry compressive stress. Prestressing of all carbon lamellas and strips located in the grooves in the circumferential, or. and the inner load-bearing masonry arranged longitudinally and transversely, are prestressed successively, usually first in the longitudinal direction of the object and then in the transverse direction of the object. After prestressing all lamellas and strips, the grooves with the inserted prestressed lamellas and strips are gradually injected with a special polymer-cement mixture. The surface of the grooves is then modified in connection with the existing surface treatment.

Reinforcing lamellas based on carbon fibers are special belts made by so-called pultrusion width 40 to 80 mm consisting of carbon fibers 0.25 to 0.32 mm thick with a tensile strength of 3000 to 4000 MPa, modulus of elasticity of 200 to 250 GPa, maximum tensile deformation 1.5 to 1.9%, density 1.5 to 2 g / cm ³ and weight 600 to 700 g / m ² .

The reinforcing strips of the desired width and thickness, which are achieved by applying the required number of fabric layers, consist of said carbon fabric and a special two-component solvent-free thixotropic epoxy resin with a pot life of 3 to 7 hours, a viscosity after mixing 550 to 750 mPas and a density after mixing 1100 to 1200 kg / m ³ , at 20 ° C.

Prestressed slats, or the strips are anchored in the masonry by means of special two-part metal or plastic anchors. The anchors are located in holes of the required dimensions

- 1 CZ 2018 - 601 A3 made of prestressed masonry. The anchors remain permanently in the masonry and are similar to the slats, or the strips are then injected with a special polymer-cement mixture. The depth of the groove depends on the condition and thickness of the masonry and the equipment for its design. The optimal depth of the groove can be considered to be about 1/4 to 1/3 of the thickness of the masonry, while maintaining min. edges of the core cross-section masonry.

The jig for coupling foundation structures can be made of both metal and plastic. It consists of an outer housing provided with guide holes and a welded nut. In the housing there is a fixed plate with a pressure surface treated with a groove and a movable upper pressure plate modified in the same way and with a welded guiding conical ring, ensuring effective abutment of the prestressing screw by which the ends of the longitudinal and transverse lamellae are fastened between the pressure plates. provided with a special reinforcing treatment and passing through guide holes in the outer housing.

Explanation of drawings

The proposed technical solution will be explained in more detail by means of exemplary embodiments shown in the accompanying drawings. Fig. 1a shows an axonometric view of a jig for coupling foundation structures. Giant. 1b shows the device in a front view, FIG. 1c in a side view and FIG. 1d a plan view. Fig. 2 shows in an axonometric view the location of the jig on the masonry corner. Fig. 3 is a diagram of the location of metal or plastic two-part anchors at the point of intersection of prestressed lamellas, or belts. Fig. 4a is a diagram of a metal or plastic support angle and in Fig. 4b metal, resp. plastic support plates. Fig. 5a shows a diagram of the lamella mounting, resp. belt and its / its anchoring in metal, or. plastic anchor in the corner of the building and Fig. 5b shows the intersection of the longitudinal and transverse walls. Fig. 6 is a diagram of the stiffening of an object by a system of longitudinal and transverse lamellae, resp. belts and Fig. 7a is a diagram of the lamella mounting, or belt and metal, or plastic anchors in the masonry in the corner of the building and Fig. 7b shows the intersection of longitudinal and transverse walls.

Examples of embodiments of the invention

FIG. 1 shows, in an exemplary embodiment, a diagram of a metal or plastic two-part anchors, consisting of an outer housing 1 provided with guide holes 2 and a welded nut 3. In the housing 1 a lower plate 4 with a pressure surface treated with a groove 5 and an upper pressure plate 6 with a pressure surface modified with a groove 5 and a welded guide conical ring 7 effective abutment of the prestressing screw 8, by means of which the ends of the longitudinal lamella 9 and the transverse lamella 10, respectively, are clamped between the plate 4 and the upper pressure plate 6, respectively. a belt with an end portion provided with special reinforcement and passing through guide holes 2 in the outer housing L

FIG. 2 shows, in an exemplary embodiment, a diagram of the location of the metal or plastic two-part anchors 1-8 on the masonry corner 12 in a pre-prepared pocket 13, resting on a metal or plastic support angle 14 and prestressed longitudinal lamellae 9 and transverse lamellae 10 or strips placed in thin deep grooves 15.

Fig. 3 shows, in an exemplary embodiment, a diagram of the location of the metal or plastic two-part anchors 1-8 in a pre-prepared pocket 13 in the masonry 12, resting on a metal or plastic support plate 16 at the intersection of the prestressed longitudinal lamellae 9 and the transverse lamellae 10 or strips placed in thin deep grooves 15.

FIG. 4 shows, in an exemplary embodiment, a diagram of a metal or plastic support bracket 14 provided with guide holes 2 and a diagram of metal or plastic support plates 16 provided with guide holes 2.

-2EN 2018 - 601 A3

FIG. 5 shows, in an exemplary embodiment, a diagram of the mounting of the longitudinal lamella 9 and the transverse lamella 10, respectively. a belt passing through the guide holes 2 of the outer housing 1 with the nut 3 welded and pressed between the lower plate 4 and the upper pressure plate 6 provided with a guide conical ring 7 by means of a prestressing screw 8.

Fig. 6 shows, in an exemplary embodiment, a diagram of the stiffening of the masonry object 17 by means of a longitudinal lamella 9 and a transverse lamella J0, respectively. strips anchored at the corner of the building 18 and at the intersection of 19 longitudinal and transverse walls.

Fig. 7 shows, in an exemplary embodiment, a diagram of the mounting of the longitudinal lamella 9 and the transverse lamella 10, respectively. strip into thin deep grooves 15 and metal, resp. plastic anchors 1-8 into a pre-prepared hole 13 in the masonry 12 with a surface treated with cement mortar 20 and resting on a metal or plastic support angle 14 or metal, or plastic support plate 16,

Industrial applicability

The proposed technical solution can be used in construction, especially in strengthening and stabilizing the foundation structures of historic and listed brick buildings.

Claims (3)

PATENT CLAIMS A device for coupling building foundations comprising a block-shaped housing (1) which is provided on the sides with guide openings (2) for slats (9) and / or strips, characterized in that the housing ( 1) a fixed bottom plate (4) is placed and on the inner upper side a movable upper pressure plate (6) is placed in the housing (1), on which a prestressing screw (8) located in a nut (3) on the upper side of the housing (1) rests, wherein the upper pressure plate (6) has on its upper side a conical ring (7) for locating the end of the prestressing screw (8) and a support plate (16) and / or a support angle (14) is connected to at least one outer side of the housing (1). Device according to claim 1, characterized in that the lower plate (4) and the upper pressure plate (6) are provided with grooves (5) for catching the lamellae (9), the ends of which are provided with reinforcement. Preparation according to Claim 2, characterized in that the lamellae (9) and / or the strips are based on carbon fibers with a width of 40 to 80 mm, a thickness of 0.25 to 0.32 mm and a tensile strength of 3000 to 4000 MPa, modulus of elasticity 200 to 250 GPa, maximum tensile strain 1.5 to 1.9%, density 1.5 to 2 g / cm ³ and grammage 600 to 700 g / m ² .