TREADMILL

Description

2 or meltwater, but can also be water from a swimming pool, a garden hose, an outdoor shower, or the like, for example. Naturally, other liquids can also be drained through these gutters. The terrace is typically sloped very slightly to ensure that the initial runoff is always drained into the gutter. 5 The most well-known solution consists of using linear drains, as can be seen, for example, in US2008163561A1. Such linear drains are placed at one or more of the edges of the terrace to drain the precipitation that falls on the terrace and are equipped with a grate to ensure that no blockages can occur in the linear drains and to prevent the drain from becoming a tripping hazard. 10 However, there are a number of problems with these linear drains. Near a swimming pool, people often walk around barefoot, making it particularly painful if a toe gets stuck in or hits a grate. Moreover, the linear drain is not aesthetically pleasing to look at and disrupts the appearance of the terrace paving. 15 To ensure that the previously listed problems occur less frequently,Slot drains have been designed, as can be seen for example in EP1499779B1 or US11549254B1. With such a slot drain, semicircular construction profile elements are provided on top of the beam-shaped base structure or base construction, with which the access opening to the base structure is narrowed upwards, making it possible to install a drain where the openings and the grates placed on top of the slot drain can be much narrower than the base structure that is positioned adjacent to the cover elements in the case of the known linear drains. The appearance of the terrace paving is spoiled less by this. The floor tiles or other terrace paving are then placed against the aforementioned profile elements from above, whereby only these profile elements and any grate between the slot drain effectively fill a slot between the tiles. Although such a design already a significant improvement over the 30 aforementioned linear gutters,The aforementioned problems still persist BE2024 / 5921 3. However, in addition, a new problem now arises because the placement of the terrace tiles always depends on the placement of the trench drain, since the trench drain must be installed first. During the planning of where the trench drain is to be placed, it is not possible to use the standard tile dimensions to determine the position of the trench drain, since the actual tiles have small but relevant deviations from these standard dimensions. If this is not done and the actual deviations of the tiles are ignored, the tiles will often not align nicely with the trench drain, ruining the appearance of the terrace. It is therefore always necessary to use the actual tiles to measure exactly where the trench drain should be placed, but the tiles cannot be placed before the trench drain, which disrupts the process of 10 the installation of the slot drain becomes very complex, because the tiles basically have to be measured out twice. Moreover, an error when placing the slot drain ensures that the tiles cannot be placed correctly,which yields extra work for the tile-laying craftsman. 15 The slot drain described in EP3272938A1 attempts to further solve the problems of linear drains by providing a slot drain consisting of various channel sections, each equipped with a grate. The tiles are now designed to be placed against upright flanges provided on the grate of the slot drain, which is located one hundred tiles and forms the support surface for the cover elements. This makes it possible to make the slot, which provides access to the openings, even narrower. However, such slot drains still have the known disadvantages: for instance, it is no longer possible for people to stub their toes on the grate, but the slot itself does pose a tripping hazard. The slot also often falls quite high.whereby the appearance of the terrace becomes less attractive. In addition, the previously discussed problem with installing the slot drain still remains. The aim of the invention is to provide a slot drain that is aesthetically less conspicuous and less visually disturbing than the known drains and where there is less risk of painful collisions with the slot drain. In addition, it is also the aim of the invention BE2024 / 5921 4 to provide a slot drain whereby a terrace with this slot drain can be installed less complexly and faster than with the known slot drains. The purpose of this invention is achieved by providing a slot drain, which extends mainly in a longitudinal direction and is suitable for draining a terrace formed with coping elements, comprising one or more gutter sections, where each gutter section encloses a bottom wall, and encloses two side walls which are provided on either side of the bottom wall and are extended mainly in a vertical direction and in the longitudinal direction to form a gutter space together with the bottom wall,and where the trench drain further comprises at least one covering piece, which is attachable or provided for on a drain section to delimit the drain space, where said covering piece is executed as a grate, where this grate comprises an upper surface into which one or more openings discharge through the grate and where the trench drain further comprises a bearing surface, which is provided for the attachment of cover elements thereon to cover the trench drain so that precipitation on the cover elements can drain through the openings in the grate, where the trench drain comprises a highest point when viewed according to the height direction,where this highest point is part of the bearing surface. Because the highest point of the slot drain is part of the bearing surface, it is possible to have the cover elements connect much closer to each other above the slot drain. In this case, profile elements such as in EP1499779B1 or US11549254B1 or upright flanges such as in EP3272938A1 no longer extend between the cover elements. As a result, the slot between the cover elements can be made virtually invisible. It also becomes impossible to bump a toe against the slot drain. By nevertheless providing a small slot opening between the cover elements,sufficient drainage can still be ensured for the precipitation that ends up on the terrace. In addition, it is also possible to install a terrace with such a slot drain much more easily, as will be discussed further in the working method according to the invention. BE2024 / 5921 5 The gutter sections preferably have a predominantly U-shaped or semicircular cross-section and comprise at least two side walls which are extended mainly along a vertical direction. The side walls may be positioned at an angle relative to the lower wall or may flow into the lower wall in an arc shape, etc. Preferably, each covering piece can be attached to a respective gutter section. A covering piece preferably has a nearly same length along the longitudinal directions and a similar width along a horizontal direction,transverse to the longitudinal direction and transverse to the vertical direction. Alternatively, it is also possible that a cover piece covers only a part of the gutter space of a gutter piece. In this case, it may be the case that multiple cover pieces can be provided next to each other in the width direction on the same gutter piece or next to each other in the length direction on the same gutter piece. Alternatively, it is also possible that the same cover piece partially or completely covers the gutter spaces of multiple gutter pieces. The cover piece can be permanently attached to one or more gutter pieces or can be detachably attached to one or more gutter pieces or, in special designs, can be permanently attached to one or more gutter pieces and detachably attached to one or more gutter pieces. The cover elements can be terrace elements that are already known according to the state of the art, such as tiles, polished concrete, cobblestones, decorative stones and the like. 25 The trench drain further preferably includes 1 or 2 end pieces,each designed to delimit the trench gutter in the longitudinal direction. The bearing surface is preferably provided on one or more cover pieces, so that the cover elements are placed on them, but it is alternatively also possible that the bearing surface is provided on one or more gutter pieces, which in this BE2024 / 5921 6 situation extend above the cover pieces. It is also possible that the bearing surface is formed partly by one or more gutter pieces and partly by one or more cover pieces. Preferably, each of the two side walls is provided with a flange, to which the other of the two side walls stands for the application of the covering piece to delimit the gutter space. The two flanges are preferably not connected to each other, but may alternatively be connected. Each side wall may be provided with multiple flanges, which lie in the extended longitudinal direction, or which are distributed along the longitudinal direction on the side wall,However, preferably each flange extends over the full length of the gutter section. Moreover, these flanges increase the strength of the slot gutters, making it much easier to remove the cover pieces in the event that the cover pieces are detachable. Preferably, the slot gutter further comprises a coupling piece, whereby this coupling piece encompasses a bottom wall and two side walls provided on either side of the bottom wall and extended mainly in the vertical direction to form a gutter section space together with the bottom wall, and whereby the slot gutter comprises a first aforementioned gutter section and a second aforementioned gutter section, which are extended in the gutter section space along the longitudinal direction to connect the first gutter section and the second gutter section to each other. 25 Providing such coupling pieces with a gutter space in which the first and second gutter sections can be installed and interconnected allows different gutter sections to be installed in line with each other and interconnected in a very practical and quick manner,whereby the slot drain becomes highly modular. These connecting pieces can be designed very compactly and 30 BE2024 / 5921 7 are preferably executed with a predominantly U-shaped or semicircular cross-section. Preferably, the side walls of the connecting piece are each provided with first coupling means and the side walls of the drain sections are each provided with second coupling means corresponding to the 5 first coupling means for connecting the connecting piece to the first drain section and connecting the connecting piece to the second drain section,for connecting the first and second gutter sections to each other. 10 The first and second coupling means make it very easy to connect the first and second gutter sections to each other by connecting both gutter sections to the coupling piece. Preferably, the first and second coupling means are for creating a click connection. Such click connections make it very easy to connect the gutter sections to the coupling piece and, if necessary, to detach them again.15 Naturally, other types of click connections are also possible, or alternatively other types of connections such as, for example, a hook connection, a clamp connection, a bolt-nut connection, a screw connection, a staple connection, a crimp connection, etc. Preferably, the first and second coupling means for both gutter sections are identical.but this need not be the case. 20 Preferably, the coupling piece is provided with support elements that extend away from the side walls of this coupling piece on one side relative to the bottom wall of the coupling piece. By providing the coupling pieces with such support elements, the trench gutter can be firmly secured in the ground. Alternatively, the gutter sections 25 can be provided with such support elements. These support elements are preferably designed as support ribs but can alternatively be designed differently. Preferably, the end pieces are also provided with such support elements. Preferably, said gutter section is provided with multiple drain pipes,where each of these multiple drain pipes preferably comprises a different pipe diameter BE2024 / 5921 8. This makes it possible to connect the trench drain to different types of drain pipes or sewer pipes. Preferably, at least one of these multiple drain pipes discharges into the bottom wall of a drain section and at least one of these multiple drain pipes discharges into the side wall of a drain section. Alternatively, it is also possible to provide drain pipes that discharge only into the side walls or drain pipes that discharge only into the bottom wall. Providing multiple drain pipes allows the same trench drain to be used with different types of drainage systems that have different connections, making it no longer necessary for the installer to make the correct selection between multiple variants of the trench drain. Preferably, one or more drain pipes are provided to the one or 10 two gutter sections bordering an end piece. Preferably, a cover piece designed as an inspection piece,that detachable and attachable to a named gutter piece to inspect this gutter piece. Such an inspection piece allows the trench gutter to be inspected, for example in the event of a drainage problem. Preferably, this inspection piece is provided with a support surface on which (part of) a cover element can be placed, so that this inspection piece can be aesthetically incorporated among the other cover elements. This (part of a) cover element is preferably attachable to the inspection piece in the longitudinal and transverse directions, viewed within the dimensions of the slot drains, and furthermore preferably load-bearing within the dimensions of this inspection piece. This allows the inspection piece to be opened up more easily without the need to remove patio tiles. Preferably, the (part of a) cover element is attached to the top wall of the inspection piece, for example by means of an adhesive joint, a clamp joint or the like. The inspection piece is preferably not provided with openings here, so that it can be attached to the cover element more easily, but alternatively it can,just like a grate, be provided with openings. Preferably, the trench drain is provided with several such inspection pieces which, in the assembled state, are distributed along the length of the trench drain. The trench drain30 according to the invention has the advantage over known trench drains that BE2024 / 5921 9 these inspection pieces can be easily interchangeable with the other cover pieces, making it easier to provide several inspection pieces to the trench drain. Because the inspection pieces can be mounted on the same gutter section as the grate, these inspection pieces can also be made much smaller than the state of the art,5 so that they will determine the aesthetics of a terrace in which they are incorporated less. Preferably, at least one such inspection piece is provided for each gutter section that contains one or more drain pipes. Preferably, the inspection piece comprises a top wall,and two side walls provided on either side of the top wall, which extend at an angle to the top wall to form a downward slope towards the side walls of the gutter section on which this inspection piece is mounted. The combination of the downward-facing side walls of the inspection piece and the side walls of the gutter sections creates a small gutter-shaped space on either side of the slot gutter at the inspection pieces. As a result, any precipitation landing on the inspection pieces will be guided away via these gutter-shaped spaces to a grate or another gutter section of the slot gutter for the water to drain away. The downward-facing slope is preferably a slope with an angle between 45° and 80° relative to the top walls, but preferably bearing an angle of approximately 70° relative to the top wall. Preferably, the two side walls of the inspection piece at the lowest point in the vertical direction are each provided with a flange facing the lowest point of the other side wall of the two side walls,where the flanges are provided25 to be mountable on the flanges of the side walls of a gutter section. This makes it very easy to place the inspection piece on a gutter section and to detach it again. The two flanges are preferably not connected to each other but can alternatively be connected to each other. Each side wall can be provided with multiple flanges, which lie in each other's extended end direction, or which are provided on the side wall, distributed over the 30 BE2024 / 5921 10 longitudinal direction.but preferably each flange extends over the full length of the gutter section. Preferably, the assembled condition is provided to adjoin an end of the inspection section viewed in the longitudinal direction to adjoin an end 5 viewed in the longitudinal direction, whereby every point of the said end of the inspection section in a first zone is higher in the vertical direction viewed in the transverse direction than every point of the said end of the grate in the first zone. Through the combination of such a consecutive grate and inspection section, it becomes particularly simple to detach the inspection sections from the slot gutter in this first zone by lifting them along 10 under the top wall. In contrast to state-of-the-art solutions for lifting inspection hatches, such as providing magnets on the top of the inspection hatches that can be gripped with magnets to lift these inspection hatches, or providing a ring that can be gripped,As a result, no attachment elements are provided that visually determine the appearance of a terrace. Preferably, the very first zone is provided centrally in the slot drain at the end of the width direction. Preferably, every point of the aforementioned end of the inspection piece in a second zone is lower in the height direction when viewed from the width direction than every point of the aforementioned end of the grate in the second zone. Even more preferable are the provision of two such second zones, whereby these second zones preferably extend in the width direction when viewed at the height of the side walls of the inspection piece. As a result, the precipitation that ends up in the small gutter-shaped space on either side of the inspection piece can flow directly under the grate and end up in the gutter pieces. Furthermore, every point of the grate in every second zone is preferably positioned higher than every point of the grate in the first zone. As a result, the upper surface of the grate acquires a unique gutter-shaped surface,whereby a filling space is created between the upper surface and the support surface in the first zone. This filling space allows water to still flow through this filling space in the event that the gutter sections are clogged, so that the drainage is not immediately blocked. The purpose of the invention is also achieved by providing an assembly of a trench drain described above, in which every point of the said end of the inspection piece in a first zone is higher in the vertical direction than every point of the said end of the grate in the first zone, and an inspection key, which is provided to grip the inspection piece to lift this inspection piece to inspect the trench drain, where the inspection key comprises a handle to which the inspection key can be gripped, and comprises an attachment arm,whereby this attachment arm is provided to grasp the inspection piece in the first zone below the top wall of the inspection grate in order to lift the inspection piece. With the aid of such an inspection key, it is possible to very easily detach the inspection pieces from the slot drain in this first zone by lifting them from below the top wall, by first inserting the inspection key above the top surface of the grate in the first zone and then letting the inspection grate grasp from below the top wall. 20 Preferably, the inspection key comprises a recess bounded by the attachment arm of the inspection key, where the recess is provided to accommodate the top wall when the attachment arm engages under the top wall of the inspection piece. This makes it easier to use the inspection key to lift the inspection piece. 25 In execution forms where the inspection piece is provided with a support surface for placing (part of) a cover element thereon, the recess is preferably not only provided to accommodate the top wall,but is this also designed to include the (part of a) cover element attached to it. This allows the inspection key to be used without a separate step being required for the removal of this cover element, making the inspection of the trench drain easier. The objective of the invention is also achieved by providing a method for installing a trench drain, where the trench drain is a trench drain5 as described above and where the method comprises the following steps: - placing the trench drain on a surface, where the support surface of the trench drain is at a height; - applying a screed on the subfloor, whereby this screed has a height that is not lower than the height of the bearing surface; and10 - placing cover elements on the screed to cover the bearing surface of the slot drain, whereby a space is maintained between the cover elements to provide a drainage channel above the grate of the slot drain. In contrast to the known slot drains,the screed floor will not be lower than the bearing surface. As a result, it is no longer necessary to account for the actual deviations of the cover elements. The cover elements may deviate by a few millimeters, but this only makes the spacing between the cover elements slightly larger or smaller, without completely ruining the aesthetic character of the terrace. This is a significant improvement, both in terms of time savings and complexity, for a trench drain installer compared to the existing trench drains. The procedure is preferably carried out in sequence,but can be carried out in any order. Preferably, the cover elements are placed on the screed floor using a mortar bed.25 Preferably, the trench drain comprises a coupling piece and includes the placing of the trench drain on a substrate the installation and mutual coupling of the first mentioned gutter piece and the second mentioned gutter piece in the gutter space of the coupling piece. Preferably, the trench drain is a trench drain with a coupling piece with first 30 and second coupling means and includes the placing of the trench drain on a substrate BE2024 / 5921 13 the coupling of the coupling piece with the first gutter piece and the coupling of the coupling piece with the second gutter piece to mutually couple the first gutter piece and the second gutter piece. In addition, the objective of the invention is also achieved by providing a method for inspecting a slot drain using an inspection key, where the slot drain is a slot drain as described above. The slot drain may be provided with said inspection pieces, which can be detached and attached to a said drain section.but alternatively can also be provided with inspection pieces as in the state of the art.10 Preferably, the slot drains and the inspection key form an assembly as described above and the method for inspecting the slot drain includes engaging the attachment arm of the inspection key under the top wall of the inspection piece to grasp the inspection piece in order to lift the inspection piece.15 Preferably, the method also includes picking up the top walls / or an attachment element that is attached to the top wall in the recess of the inspection key while engaging the attachment arm of the inspection key under the top wall of the inspection piece. The upper surface of the grate is preferably designed in a gutter shape, whereby the openings are provided only in the lower part of the gutter shape and the bearing surface is provided on the higher part of the gutter shape. This creates a gap between the gutter space of the gutter section and the cover elements. This gap has the advantage that if the gutter sections are clogged,extra water can enter this intermediate space so that the drainage of the terrace is less likely to be obstructed. This invention is now further explained on the basis of the detailed description below of some preferred design forms of a trench drain according to this invention. The purpose of this description is solely to provide clarifying examples and to indicate further advantages and particulars of this invention, and therefore cannot be interpreted as a limitation of the scope of application of the invention or of the patent rights claimed in the claims. In the detailed description reference is made by means of reference figures to the attached drawings, in which: -figure 1 shows a cross-section of part of a terrace, at the height of a design form of a trench drain according to the invention; -Figure 2 shows a variant of a part of the cross-section from Figure 1, zoomed in on the connection between the slot drain and the cover elements,where the spacing between the cover elements is shifted relative to Figure 1; - Figure 3 shows a design of a gutter section with a grate according to the invention in perspective; 15 - Figure 4 shows a design of an angled gutter section with a grate according to the invention in perspective; - Figure 5 shows a design of a coupling piece according to the invention in perspective; - Figure 6 shows a part of a slot gutter at the connection of several 20 gutter sections as in Figure 3 that are coupled using the coupling piece from Figure 5 in perspective; - Figure 7 shows the upper part of a gutter section from Figure 1 in side view, where it is schematically indicated how an inspection piece can be attached to it; 25 - Figure 8 shows a gutter section with a grate attached to it as depicted in Figure 1 in side view, where the inspection piece from Figure 7 is schematically shown; - Figure 9 shows a design of a gutter section,equipped with drain pipes is shown in perspective with an inspection piece attached thereto; 30 BE2024 / 5921 15 -figure 10 a part of a trench drain at the height of a design of an end piece is shown in perspective; and in -figures 11-14 designs of an inspection key according to the invention are shown in perspective. 5 In figures 1-2, a design of a slot drain (2) according to the invention is shown, which extends mainly in a longitudinal direction (L) across these figures, where the slot drain (2) is placed on a terrace (1) and provides for the drainage of the precipitation that falls on this terrace (1). The slot drain (2) comprises several gutter sections (4) that lie in a continuous line, of which only one gutter section (4) is visible in the cross-section on the partial direction (L). A cover piece (51) is attached to this gutter section (4),This is executed as a grate(51). The assembly of the gutter(4) and the grate(51) ​​is shown separately in perspective in Figure 3. The gutter(4) comprises a bottom wall(41) and two side walls(42) which are provided on either side of the bottom wall(41) and rise in a height direction(H) relative to the bottom wall(41). The bottom wall(41) and the two side walls(42) form a gutter space(43), which is also bounded by the grate(51).that the gutter space(43) of the entire gutter piece(4) limits the design shown. 20 The grate(51) ​​comprises an upper surface(511) and several openings(512) that extend through the grate(51) ​​and open into the upper surface(511). These openings(512) ensure that precipitation that lands on the upper surface(511) enters the gutter space(43) and that the precipitation is drained away.25 The gutter(4) is further equipped with two flanges(421) which are provided on one side wall(42) of the gutter(4) and extend over the full length of the gutter(4). Above these flanges(421), the side walls(42) of the gutter(4) are provided with first click devices(423), which are bounded by these flanges(421). The grate(51) ​​is provided at the bottom with corresponding second click devices(514), for creating an easily detachable BE2024 / 5921 16 click connection between the grate(51) ​​and the gutter(4) when installing the second click devices(514)ontheflanges(421).Such click connections,Variants of this and alternative fastening methods for connecting a grate(51) ​​to a gutter(4) are known from the state of the art. In the shown design of the slot gutter(2), the grate(51) ​​rests on the gutter(4), but in alternative designs it is also possible that the grate(51) ​​is, for example, permanently attached to the slot gutter(2). The openings shown(512) are circles with a cross-section that is preferably at least half the width of the slot gutter(2). Of course, the openings(512) can also have other shapes or diameters in alternative designs. Figures 1 and 2 illustrate how the slot drain (2) can be installed according to the invention. First, the slot drain (2) is placed on the subfloor (11), after which a screed (12) is placed on the subfloor (11). It is important here that the screed (12) does not come lower than the highest point (7) or the highest points (7) of the slot drain (2) viewed in the height direction (H), so that both the highest points (7) of the slot drain (2) and the screed (12) together form a support surface,on which the cover elements(3) can be placed. Naturally, a slot-shaped space(13) is always maintained between the cover elements(3) to allow precipitation20 into the slot drain(2). In this design, the highest points(7) of the slot drain(2) are provided on the two side walls(42) of the gutter piece(4), but in alternative designs, these highest points(7) can also be provided at other places on the slot drain(2), such as the grate(51). 25 One of the important advantages of this invention is that the coping elements(3) can have real deviations without disturbing the appearance of the terrace(1). Figure 1 shows a cross-section of the terrace(1) where the coping elements(3) are placed such that this space(13) is central, whereas in Figure 2 the space(13) is no longer central but is shifted in a width direction(B), which is perpendicular to the height direction(L) and perpendicular to the height direction(H). The coping elements(3) are preferably tiles,for example with a dimension of 80cm by 80cm. The spacing (13) is preferably formed by a joint between the set tiles that is smaller than 7mm and preferably equal to 5mm, but this can of course vary due to the actual variations of the tiles. 5 Figure 4 shows an angled gutter piece (4) with two legs extending at an angle of 90°. Such an angled gutter piece (4) can, for example, be used at the corner of a terrace (1). The longitudinal direction (L) in which the slot gutter (2) mainly extends changes orientation along with the said legs, causing the width direction (B) to also change orientation along with the said legs. 10 Naturally, the slot gutter (2) can also consist of gutter pieces (4) that are formed at an angle different from 90°, or gutter pieces (4) that follow a curved or rounded path. Parts of the direction (L) and the width direction (B) will always be oriented accordingly. 15 Figure 5 shows a coupling piece (8) according to the invention,that a bottom wall (81) encompasses two side walls (82) which are provided to the bottom wall (81) and extend mainly in the vertical direction (H) and together with the bottom wall (81) form a gutter space (83), in which two gutters (4) can be installed and coupled together, as shown in figure 6. The side walls (82) of the coupling piece (8) are provided with first coupling means (84) and the side walls (42) of the gutters (4) with corresponding second coupling means (422). The second coupling means (422) are provided per side wall (42) of the coupling piece (8) in the form of a slot and the first coupling means (84) are provided per side wall (82) of the gutters (4) in the form of a projection, which can be clicked into the corresponding slot to the two gutters (4) to connect with the coupling piece(8) and thereby connect to each other. Because the first and second coupling means(422) include a slot and a corresponding projection,It is also possible to install the gutter sections (4) sideways into the coupling piece (8) to connect the gutter sections (4) to the coupling piece (8). All 30 gutter sections (4) in this design form are provided over their entire length with BE2024 / 5921 18 these slots, which makes the manufacture of the gutter sections (4) easier. The coupling pieces (8) are also provided with support elements (85), in the form of support ribs, which extend away from the side walls (82) of this coupling piece (8) on one side relative to the bottom wall (81) of the coupling piece (8), so that the slot gutter (2) grips the substrate (11).5 The gutter sections (4) that are connected to each other preferably each have a length of 1 sleeve or 2 m. Preferably they have the same cross-section over their entire length,so that they can also be sawn to length. With the help of the connecting pieces(8) it is very easy to form a very long slot gutter(2).10 Figures 7 and 9 show respectively a cross-section of an inspection piece(52) according to the inventions and this inspection piece(52) in perspective. This inspection piece(52), just like the grate(51), is a covering piece(51,52) intended to limit the gutter space(43). The inspection piece(52) is attached to the flanges15 (421) of the gutter(4) and is intended to be detached from a gutter(4) to inspect the slot gutter(2). The inspection piece(52) includes a top wall(521), which here contains no openings(512),and two side walls (522) provided on either side of this top wall (521). The side walls (522) extend at an angle to the top wall (521) in order to form a downward slope towards the side walls (42) of the gutter piece (4) on which this inspection piece (52) is mounted in the assembled condition of the slot gutter (2). This slope is preferably a slope with an angle (α) between 45° and 80° with respect to the top wall (521) and more preferably bearing an angle (α) of approximately 70° with respect to the top wall (521). This creates a small gutter-shaped space (523) between the side wall (522) of the inspection piece (52) and the side wall (42) of the gutter piece (4) on which the inspection piece (52) is mounted, and this on either side of the trench gutter(2). This gutter-shaped space(523) allows precipitation that ends up at the height of the inspection piece(52) between the cover elements(3) on the trench gutter(2), for example through a small joint between the cover elements(3),30 can still be drained away. BE2024 / 5921 19 The top wall(521) of the inspection piece(52) does not contain any openings(512),so that it is easy to glue or otherwise attach a cover element (3), such as a piece of tile, to this inspection piece (52).5 The ends in the partial direction (L) as seen from an inspection piece (52) will always border the ends in the partial direction (L) as seen from a grate (51). To ensure that the inspection pieces (52) can be removed very easily, the slot drain (2) is provided with a first zone (E1) in the width direction (B) in which it is possible to go over the top surface (511) of the grate (51) and under the top wall (521) of the inspection piece (52) to lift the inspection piece (52). Figure 8 shows an overlap of a such an inspection piece(52) and a grid(51) on which it is clearly visible in the first zone(E1) that each point of the inspection piece(52) is higher according to the height direction(H)15 than each point of the grid(51),whereby an entry opening (53) is formed between the inspection piece (52) and the grate (51) to be able to grip the bottom of the inspection piece (52) via this entry opening (53). It can also be seen in the gutter-shaped spaces (523) that a second zone (E2) is created, where each point of the grate (51) is higher than each point of the inspection piece (52), creating 20 drainage openings (54), through which the precipitation that ends up in the gutter-shaped spaces (523) can be drained directly. Because the top surface (511) of the grate (51) in grates (51) with the same cross-section will be lower over their entire length according to the height direction (H) in the first zone (E1), a filling space (513) is also created in this grate (51). This filling space (513) can, as 25 as can be seen in figures 1 and 2, be filled with precipitation in the event that the trench drain (2) is, for example, clogged. Figure 9 shows a special drain piece (4) according to the invention that contains 2 drain pipes (10),where one drain pipe (10) is provided through the bottom wall (41)30 of the gutter (4) and the other through a side wall (42) of the BE2024 / 5921 20 gutter (4). This gutter (4) also includes an inspection piece (52) so that it is possible to check the drain pipes (10) should there be a blockage of the drainage. The two drain pipes (10) each have different diameters and preferably have diameters of 50 mm and 75 mm respectively so that they can be easily connected to pipes with standard dimensions. Figure 10 shows an end piece (6) according to the invention, which is intended to be fitted at one end of the trench gutter (2) in the direction (L) to limit the trench gutter (2) and the gutter space (43) provided therein. The The end piece(6) is equipped with support elements(61), just like the connecting pieces(8), to better support the slot drain(2) at the ends. The illustrated slot drain(2) therefore includes gutter pieces(4), cover pieces(51,52), connecting pieces(8) and end pieces(6). The gutter pieces(4) and cover pieces (51,52) are preferably made of a metal and, in higher preference, of an aluminium or aluminium alloy such as AlMgSi alloys like Aluminium 6060 or 6063. These gutters (4) and cover pieces (51, 52) can be manufactured for this purpose, for example by extrusion. Preferably these pieces are anodized and, in higher preference, anodized to a thickness of 15 microns. 20 The end pieces (6) and coupling pieces (8) on the other hand are preferably made of plastic and, in higher preference, of a plastic such as polyphenylene ether (PPE). For this purpose, for example, these can be manufactured by an injection molding process. Figures 11 to 14 show 4 different designs of an inspection key (9) according to the invention. These inspection keys (9) each comprise a handle (91), which can be used to grip the inspection key (9), and an attachment arm (92).which is provided to grip the aforementioned first zone (E1) via the insertion opening (53) under the top wall (521) of the inspection piece (52) to lift the inspection piece (52). The 30 inspection keys (9) also include a recess (93) which is bounded by BE2024 / 5921 21 this insertion arm (92) and by the handle (91). This recess (93) is provided to take one edge of the inspection piece (52) in the first zone (E1) into this recess (93) when lifting the inspection piece (52). The recess (93) of the inspection key (9) may or may not be bounded by rounded edges, and by different serrations, as can be seen on d,