EE01653U1 - Door threshold with thermal break - Google Patents

Abstract

The invention relates to a door threshold with a cold bridge break, which includes cast floor plates 1 and 2 that are on opposite sides of the door threshold, and reinforcement bars 3 connecting them. Between the floor plates 1 and 2, there is a vertical thermal insulation plate 4 with an edge running in the direction of the door threshold, the upper edge of the vertical thermal insulation plate 4 is covered by a generally U-shaped door threshold cover profile 5. Reinforcement bars 3 are made of non-metallic material, vertical thermal insulation plate 4 is a foam glass plate, and U-shaped cover profile 5 is made of thermoplastic elastomer (TPE).

Description

 Technical field

The invention relates to a door threshold, more specifically to a door threshold with a thermal break. In particular, the invention relates to a door threshold for use in openings in residential or industrial garage doors with slab or strip foundations, door openings, and bases of automatically opening doors in areas with heavy traffic of people or machines in and out of buildings.

State of the art

A door threshold design for breaking a thermal bridge is known from United States patent application US2021/172240A1 (published 10.06.2021). The concrete slab outside the building and the concrete floor slab inside the building are interconnected by steel reinforcing bars perpendicular to the direction of the door threshold, which ensures stability of these concrete slabs against different settlement, and there is a thermal insulation board between these concrete slabs. The thermal insulation board is covered with a cover profile, which is a U-shaped metal profile running along the threshold in cross section, the edges of which rest on steel reinforcements.

This U-shaped metal profile passes through the vertical line to be insulated and, together with the steel reinforcement, further reduces the thermal resistance of the structure. The surface of the U-shaped metal profile is smooth and remains flush with the floor, so in the event of an unsuitable wind direction, for example, rainwater is pushed by the wind under the door seal through the interior space. EPS thermal insulation boards are used as insulation in this solution. EPS thermal insulation boards are placed in conditions that are affected by water and water vapor, which penetrate the thermal insulation boards over time, and as a result, over the years, the moisture content in the EPS thermal insulation boards increases to 10% of the volume, which reduces the thermal resistance by approximately 3 times.

The closest known solution is described in Finnish patent FI128868B (published 03.08.2017), which describes a door threshold that includes an elongated plate-like body forming the cover profile of the door threshold, which is generally U-shaped and where the lower surface of the body has gripping elements for engaging with a concrete slab outside the building and a concrete slab of the floor inside the building. On the lower surface of the body

A thermal insulation board is attached to prevent the formation of cold bridges. A heating element, such as a heating cable, heating mat, etc., is located between the thermal insulation board and the U-shaped housing.

This construction of the housing does not prevent various subsidences of the inner and outer parts of the floor (concrete slabs). Due to its high specific thermal conductivity, the metal housing is an element that works against breaking the cold bridge in the solution and requires separate heating in the form of a heating element to prevent the formation of condensate.

The previous solutions described above have attempted to prevent the formation of a cold bridge in the door threshold, but the choice of materials used in these solutions creates problems in long-term use. Steel structural parts pass through the thermal break area, thermal insulation materials are not water vapor diffusion resistant, etc.

The aim of the invention is to propose a door threshold with a thermal break, which solves the shortcomings of the prior art, is easy to install and whose thermal insulation capacity remains practically unchanged throughout its entire service life. Essence of the invention

The present invention provides a door threshold with a thermal break, comprising cast floor slabs on either side of the door threshold and reinforcing bars connecting them, a vertical thermal insulation board with an edge extending in the direction of the door threshold between the floor slabs, and a generally U-shaped door threshold cover profile covering the upper edge of the thermal insulation board.

Reinforcing bars are made of a non-metallic material, such as a glass fiber composite. Reinforcing bars are made of a non-metallic material with a specific thermal conductivity (A) of less than 0.7 W/(m-K).

The thermal insulation board is a foam glass board with a thickness of at least 40 mm, preferably at least 50 mm. The U-shaped cover profile is made of thermoplastic elastomer (TPE). The foam glass thermal insulation board has a compressive strength of at least 2.9 MPa.

In another embodiment, there is a horizontal foam glass thermal insulation board under at least one of the cast floor slabs, the edge of which rests against a vertical thermal insulation board between the floor slabs. The foam glass thermal insulation board has a thickness of at least 40 mm, preferably at least 50 mm.

List of illustrations

The invention is described below with reference to the accompanying schematic drawings, in which:

Figure 1 shows an axonometric view in section of a door threshold structure with a thermal break according to the invention;

Figure 2 shows a cross-section of the door threshold structure according to Figure 1, taken perpendicular to the door threshold.

Figure 3 shows an axonometric view of the structural elements of the door sill shown in Figures 2 and 3; and

Figures 4 and 5 show two embodiments of a door threshold cover profile.

Implementation example

For the sake of clarity, the same details and elements in different drawings are designated by the same reference numbers.

Figures 1 and 2 show a door threshold with a thermal break according to the invention, which includes concrete floor slabs 1 and 2, one on each side of the door threshold. The reinforcing bars 3 connecting them pass between the floor slabs 1 and 2 through a vertical thermal insulation board 4 with an edge running in the direction of the door threshold.

The upper edge of the vertical thermal insulation board 4 is generally covered by a U-shaped threshold cover profile 5. In the embodiment shown in the drawings, a horizontal foam glass thermal insulation board 6 is located under one of the cast floor boards 1, the edge of which rests against the vertical thermal insulation board 4 between the floor boards.

The lower edge of the vertical thermal insulation board 4 rests on the XPS insulation board in the embodiment shown in the drawings.

The embodiment shown in Figures 1 and 2 shows a garage door 7, the lower edge of which rests against the door threshold cover profile 5 in the closed position. Two possible embodiments of the cross-section of the cover profile 5 are shown in Figures 4 and 5.

For the sake of clarity, the structural elements of the door sill without the floor slabs 1 and 2 and other building construction are shown in Figure 3. The horizontal foam glass thermal insulation board 6 shown can be on both sides of the vertical thermal insulation board.

insulation board 4, the door threshold construction can also be made without a thermal insulation board 6.

The reinforcing bars 3 are made of non-metallic material, the vertical thermal insulation board 4 and the horizontal foam glass thermal insulation board 6 are made of foam glass board. The foam glass thermal insulation board 6 is, for example, Foamglas T3+ with a thickness of 100 mm.

The vertical thermal insulation board 4 is, for example, a foam glass Perinsul HL board with dimensions 50x200x450 mm.

For example, Schöck Isolink C-SH-D12-L 350/200-30°-1.0 fiberglass anchors are used as reinforcing bars 3. Schöck Isolink anchors have a thermal conductivity that is 70 times lower than steel reinforcing bars and 25 times lower than stainless steel.

Thanks to the point thermal conductivity of the C-SH-D12 anchor of 0.0009 W/(m-K), heat loss is practically non-existent. An average of 4.44 anchors are used per meter, and the thermal conductivity correction factor for a 3-meter wide doorway, including anchors, is 0.01 W/(m-K).

The U-shaped cover profile 5 is made of thermoplastic elastomer (TPE), which is a highly UV-resistant, highly elastic and strong material. The cover profile 5 is shaped in such a way that when free, the highest point is 12 mm above the floor level.

This prevents rainwater from entering the interior of the garage door from under the seal due to wind. There is a 6 mm gap in the horizontal part of the U-profile, and the profile is 7 mm above the floor level under the vehicle wheel.

The U-shaped shape of the cover profile 5 prevents water, dirt, debris, leaves and snow from getting from one side of the cover profile 5 to the other side (from the outside to the inside and vice versa) and facilitates the tight closing of the seal at the bottom of the downward-sloping garage door 7 against said cover profile 5.

The thermal expansion of foam glass panels is similar to that of concrete, and the lifespan of foam glass is also similar to that of a concrete floor. The thermal insulation of foam glass panels is not affected by water or moisture.

For example, the specific thermal conductivity (Ä) of foam glass Perinsul HL board is 0.058 W/(m-K) and does not change over time. The compressive strength at 0% deformation is 2.9 MPa, which is sufficient to withstand the loads exerted by vehicle wheels.

For example, the specific thermal conductivity (λ) of Foamglas T3+ foam glass board is 0.036 W/(m*K) and the compressive strength is 500 kPa at 0% deformation.

List of reference numbers

1 floor tile

2 floor tiles

3 reinforcing bars

4 upright thermal insulation boards

5 cover profile

6 horizontal thermal insulation boards

7 garage door

Claims (7)

1. A door threshold with a thermal break, comprising cast floor slabs (1, 2) on opposite sides of the door threshold and reinforcing bars (3) connecting them, a vertical thermal insulation board (4) with an edge running in the direction of the door threshold between the floor slabs (1, 2), a generally U-shaped door threshold cover profile (5) covering the upper edge of the vertical thermal insulation board (4), characterized in that the reinforcing bars (3) are made of a non-metallic material, the vertical thermal insulation board (4) is a foam glass board, and the U-shaped cover profile (5) is made of a thermoplastic elastomer (TPE). 2. A door threshold with a thermal break according to claim 1, characterized in that the reinforcing bars (3) are made of a glass fiber composite. 3. A door threshold with a thermal break according to any preceding claim, characterized in that the reinforcing bars (3) are made of a non-metallic material with a specific thermal conductivity (A) of less than 0.7 W/(m-K). 4. A door threshold with a thermal break according to any preceding claim, characterized in that the foam glass plate has a compressive strength of at least 2.9 MPa. 5. A door threshold with a thermal break according to any preceding claim, characterized in that the foam glass plate has a thickness of at least 50 mm. 6. A door threshold with a thermal break according to any of the preceding claims, characterized in that the reinforcing bars pass through the vertical thermal insulation board (4). 7. A door threshold with a thermal break according to any preceding claim, characterized in that at least one cast floor slab (1, 2) is provided with a horizontal foam glass thermal insulation board (6), the edge of which rests against a vertical thermal insulation board (4) between the floor slabs (1, 2).