RU2164989C2 - Expansion section for concrete structures - Google Patents

Abstract

FIELD: construction engineering. SUBSTANCE: expansion section has two parts secured on concrete either side of expansion joint and central compressible expansion section installed between mentioned parts and designed for arrangement in expansion joint. Novelty is that parts placed in concrete are formed by two side walls spreading along each other with their side walls are provided with two flexible ribs facing opposite sides; clearance is formed between mentioned ribs to receive material swelling under influence of liquid; expansion section is formed by, at least, one lintel elastically deformed between two side walls. EFFECT: improved liquid tightness provided by section which is easy to use. 7 cl, 1 dwg

Description

 The invention relates to an expansion profile, and more particularly to expansion joints (joints) in concrete structures, in which the expansion profile is a profile of the type that contains two parts fixed in concrete on both sides of the expansion joint, while the central compressible expansion part is located in expansion joint.

 Expansion joints in concrete structures are necessary to compensate for the effects of thermal expansion of concrete. If concrete is reinforced, the ends of the reinforcement are located at the expansion joint.

 Such expansion joints are usually filled with an elastic expansion profile of the type indicated above, on the front and back sides they are filled with an expansion plate, for example, of wood fiber, synthetic foam or cork, and the outer edges of the connection are filled with an elastic mass or mastic.

 An expansion profile, usually made of polyvinyl chloride or rubber, located in the center of the joint prevents water from leaking through the elastic sealing mass of the joint.

 Known expansion profiles contain a central part and two parts on both sides of it, which are flat wings with round thickenings on their outer edges.

 To obtain a waterproof seal for the expansion joint, it is imperative that water cannot flow through the wings located in the concrete.

 In these known expansion profiles, water resistance is based on the strong compression of the wing thickenings by the concrete and the pressure exerted by the thermal deformation of the concrete.

 To improve water resistance, it is known to use swellable material in the form of rubber bands on the thickened edges of the wings. These swellable strips will swell in the event of a possible leakage of liquid and, thus, pressed against concrete to compensate for insufficient compression by concrete.

 However, the degree of compression by concrete of these thickenings is not always sufficient to ensure water tightness, even with the use of such strips of swelling rubber, due to the possible porosity of the concrete.

 In addition, the use of such an expansion profile is difficult due to its shape and size.

 The basis of the invention is the task of creating an expansion profile that does not have the above and other disadvantages, is relatively easy to use and provides good sealing against fluid leakage.

 This problem is solved according to the invention in that the parts of the expansion profile placed in the concrete are formed by two side walls extending along each other and provided on their sides facing in opposite directions with two elastic ribs, between which a space is created for the material swelling under the influence of a liquid while the expansion part is formed by at least one elastically deformable bridge between the two side walls.

 The expansion profile preferably contains two elastically deformable bridges, which together with two side walls form a box.

 Both side walls can extend along both longitudinal edges of the expansion profile beyond the jumper or jumpers so that grooves are formed on both edges for mounting the joint aggregate plates.

 The two ribs on the side wall preferably have outer sides that diverge from each other and depart from the side wall.

 The inner sides of the two ribs on the side wall may be provided with grooves facing each other to grip the edges of the strip of swellable material.

 The above expansion profile can be launched into mass production as such.

 However, the invention also relates to such an expansion profile, where material is placed between the ribs on each side, which swells under the influence of a liquid.

 This material may be in the form of a strip.

 Suitable swellable materials may be bentonite, water-swellable resin or water-swellable rubber compositions, or combinations of two or more of these materials.

 In order to better show the characteristics of the invention, an expansion profile in accordance with the invention is described below as an example without any restrictive nature, while reference is made to the accompanying drawing, which represents an expansion joint in concrete in which an expansion profile is applied, corresponding to the invention.

 The drawing shows a part of a concrete wall 1, in which there is an expansion joint 2.

 This concrete wall 1 may be part of a building, tank, channel, dam, foundation, etc.

 In the middle between the front side and the rear side of this concrete wall 1, in the expansion joint 2, there is an expansion profile 3 according to the invention, which is made, for example, of polyvinyl chloride and provided with two strips 4 of moisture swelling material, a plate is located in front and behind the profile 3 5 filler, for example, of wood fiber, synthetic foam or cork, and at the front and rear ends is a strip 6 or an elastic sealant such as mastic.

 The expansion profile 3 essentially consists of two side walls 7 and 8 extending side by side and almost parallel to each other, which are connected to each other by two elastically deformable bridges 9 and which are provided on their sides facing in opposite directions, two ribs 10 that extend parallel each other along the entire length of the expansion profile 3.

 Outer sides 11 of two adjacent ribs 10 facing in opposite directions obliquely deviate from the side walls 7 or 8 and expand outward.

 The inner sides of these two ribs 10 facing each other are provided with grooves 12 located adjacent to the walls 7 or 8 for one of the above strips 4 of material that swells under the influence of moisture, such as bentonite, a resin that swells under the influence of a liquid, or rubber that swells under exposure to liquids.

 Elastically deformable jumpers 9 are formed by two walls bent at an obtuse angle.

 At both longitudinal edges of the expansion profile 3, the side walls 7 and 8 extend beyond the jumpers 9, the side wall 7 being a little further than the side wall 8. Thus, grooves 13 are formed along the longitudinal edges, into which the edges of the filler plates 5 are inserted.

 After installation in the expansion joint 2 in the concrete wall 1, the side walls 7 and 8 together with the ribs 10 departing from them form parts that are filled with concrete, while the jumpers 9 form the parts that are located in the expansion joint 2 and together with the walls 7 and 8 limit a box in which the width of the inner space corresponds to the thickness of the expansion joint 2.

 Apply expansion profile 3 as follows.

 The edges of the side wall 7 are attached to the inner side of the formwork for part of the concrete wall 1 on one side of the expansion joint 2 so that the ribs 10, between which there is a strip 4 of swelling material, are oriented inward to the formwork.

 Then concrete is poured into this formwork.

 After the concrete has solidified sufficiently and this formwork has been removed, the aggregate plate 5 is placed in the grooves 13, the formwork is installed to create the next part of the concrete wall 1, and this formwork is also filled with concrete.

 The edges of the side wall 7 are located on the surface of the concrete of the first part, and the aggregate plates 5 are connected with these edges and concrete. When pouring concrete into the second formwork, the edges of the side wall 8 are pressed against the aggregate plates 5, and these edges are also located on the concrete surface of the second part of the concrete wall 1.

 In both parts of the concrete, the latter is located between the inclined outer side 11 of the ribs 10 and the side wall 7 or 8, while the strips 4 that are adjacent to these side walls 7 and 8 are located at their edges in the grooves 12 of the adjacent ribs 10.

 Liquid that could penetrate into the expansion joint 2 and seep between the edges of the side walls 7 and 8 and the aggregate aggregate plates 5 is retained by the jumper 9.

 Liquid that could seep from the side of the side wall 7 or 8 facing the concrete can only flow around the rib 10 and then comes into contact with the strip 4, which will swell under the influence of moisture.

 As a result, this strip 4 pushes both ribs 10, between which it is located, from each other, due to which they are pressed more strongly to the concrete and, in particular, the inclined outer sides 11 are pressed against the concrete so that possible leakage along one of these outer sides 11 is prevented.

 The configuration of the expansion profile 3 according to the invention contributes to its rather easy application and ensures its good adherence to concrete.

 In any case, fluid leaks, the ribs 10 act as valves that are actuated by swelling material and which immediately prevent possible leakage of fluid.

 The expansion profile 3 acts in both directions and creates a seal for both drinking water and groundwater, salt water, wastewater and even non-water liquids.

 The invention is in no way limited to the embodiment described above and presented in the drawing, and such an expansion joint can be carried out in various ways without going beyond the scope of the invention.

Claims (7)

 1. An expansion profile for concrete structures, comprising two parts fixed in concrete on both sides of the expansion joint, and a central compressible expansion part located between them, intended to be located in the expansion joint, the parts fixed in concrete being formed by two, extending along each other the other side walls, which have on their sides, facing in opposite directions, two elastic ribs, and the expansion part is formed of at least one elastic but a deformable bridge between two side walls, characterized in that a material swellable under the influence of moisture is placed between the elastic ribs on both walls.  2. The expansion profile according to claim 1, characterized in that it contains two elastically deformable jumpers, which together with the side walls form a box.  3. The expansion profile according to claim 1 or 2, characterized in that both side walls extend along both longitudinal edges of the expansion profile beyond the jumper so that gutters are formed on both edges to accommodate the joint aggregate plates.  4. The expansion profile according to any one of the preceding paragraphs, characterized in that the two ribs on the side wall have outer sides that diverge from each other and depart from the side wall.  5. The expansion profile according to any one of the preceding paragraphs, characterized in that on the inner sides of the ribs are made facing each other grooves to capture the edges of the strip, swelling under the influence of a liquid material.  6. The expansion profile according to claim 5, characterized in that the swelling material has the shape of a strip.  7. An expansion profile according to any one of claims 5 and 6, characterized in that the swellable material contains one or more substances from the group comprising bentonite, a resin that swells under the influence of a liquid, and rubber that swells under the influence of a liquid.