INSULATION WALL AND INSULATION PLATE FOR CONSTRUCTING THE INSULATION WALL

Abstract

An insulation wall is constructed from insulation plates. The edge sides of the insulation plates are provided with edge connecting elements such as a tongue, a groove or a ridge for forming a tongue and groove joint or a half lap joint between adjacent insulation plates in the insulation wall. At least one drainage channel is provided through the insulation wall for draining away moisture that has penetrated between the insulation plates into the insulation wall. This at least one drainage channel includes adjoining drainage channel sections which are provided in the longitudinal direction on the edge connecting elements of the interconnected insulation plates.

Claims

1-16. (canceled)

17. An insulation plate for constructing an insulation wall, comprising a plurality of interconnected isolation plates, wherein the insulation plate is substantially rectangular in shape, wherein the insulation plate has a front side, a rear side, and four edge sides, wherein each edge side is provided lengthwise with an edge connecting element selected from the list consisting of a tongue, a groove, a ridge flush with the front side of the insulation plate, called the front ridge, and a ridge flush with the rear side of the insulation plate, called the rear ridge, wherein the tongue is essentially complementary to the groove and the front ridge is essentially complementary to the rear ridge, wherein at least one of the edge connecting elements at the edge sides is provided lengthwise with at least one drainage channel section, wherein the insulation plate is provided lengthwise at each edge side with a different edge connecting element selected from the list consisting of the tongue, the groove, the front ridge and the rear ridge, and wherein the tongue and the groove are provided at two opposing edge sides of the insulation plate, and the front ridge and the rear ridge are provided at the two remaining opposing edge sides of the insulation plate, and in that the different edge connecting elements of the insulation plate merge into each other at the corners between the edge sides such that no rectilinear passageways for moisture through the insulation wall are present in the joints between the interconnected insulation plates of the insulation wall.

18. The insulation plate according to claim 17, wherein at least one drainage channel section is provided at one end with a raised wall.

19. The insulation plate according to claim 18, wherein the raised wall is at least partly formed by the edge connecting element on the edge side adjacent to the edge side on which the at least one edge connecting element is provided.

20-21. (canceled)

22. The insulation plate according to claim 17, wherein the at least one drainage channel section is provided as a recess along the longitudinal direction of the edge connecting element on which the at least one drainage channel section is provided.

23. The insulation plate according to claim 17, wherein the insulation plate is, at the circumference of at least one side face, selected from the front side and the rear side, provided with an indentation for receiving an adhesive.

24. The insulation plate according to claim 23, wherein the indentation has a predetermined depth.

25. The insulation plate according to claim 17, wherein the edge connecting elements of the insulation plate are arranged such that complementary edge connection elements of the interconnected insulation plates of the insulation wall snap together.

26. The insulation plate according to claim 25, wherein the edge connecting elements of the insulation plate are arranged such that complementary edge connection elements of the interconnected insulation plates of the insulation wall snap together by means of corresponding protrusions and recesses on the edge connecting elements.

27. The insulation plate according to claim 17, wherein the insulation plate is provided with a plurality of adhesion grooves for receiving an adhesive for wall cladding elements on at least one side face, selected from the front side of the insulation plate and the rear side of the insulation plate, along at least one direction, selected from the longitudinal direction of the insulation plate and the crosswise direction of the insulation plate.

28. The insulation plate according to claim 27, wherein the plurality of adhesion grooves have a wavelike shape.

29. The insulation plate according to claim 27, wherein the plurality of adhesion grooves have a narrowed entry aperture.

30. The insulation plate according to claim 17, wherein the insulation plate is provided, on at least one side face selected from the front side and the rear side, with a plurality of ridges along at least one direction selected from the longitudinal direction of the insulation plate and the crosswise direction of the insulation plate, and wherein the ridges are arranged such that they are spaced apart at regular intervals on the insulation wall.

31. The insulation plate according to claim 30, wherein the insulation plate is provided, on at least one side face selected from the front side and the rear side, with a plurality of rectilinear ridges along at least one direction selected from the longitudinal direction of the insulation plate and the crosswise direction of the insulation plate, and wherein the ridges are arranged such that they are spaced apart at regular intervals on the insulation wall.

32. The insulation plate according to claim 17, wherein the insulation plate comprises an insulating material selected from the list consisting of expanded polystyrene (EPS), extruded polystyrene (XPS), polyurethane (PUR) and polyisocyanurate (PIR).

33. The insulation plate according to claim 32, wherein the insulation plate comprises the insulating material expanded polystyrene (EPS).

34. The insulation plate according to claim 17, wherein the insulation plate is arranged for mounting wall cladding elements, both at the front side and at the rear side.

35. An insulation wall for a building, wherein the insulation wall is composed of a plurality of interconnected, substantially identically shaped insulation plates, wherein each insulation plate is substantially rectangular in shape, wherein each insulation plate has a front side, a rear side, and four edge sides, wherein each edge side is provided lengthwise with an edge connecting element selected from the list consisting of a tongue, a groove, a ridge flush with the front side of the insulation plate, called the front ridge, and a ridge flush with the rear side of the insulation plate, called the rear ridge, wherein the tongue is essentially complementary to the groove and the front ridge is essentially complementary to the rear ridge, wherein at least one of the edge connecting elements at the edge sides is provided lengthwise with at least one drainage channel section, wherein each insulation plate is provided lengthwise at each edge side with a different edge connecting element selected from the list consisting of the tongue, the groove, the front ridge and the rear ridge, and wherein the tongue and the groove are provided at two opposing edge sides of each insulation plate, and the front ridge and the rear ridge are provided at the two remaining opposing edge sides of each insulation plate, and in that the different edge connecting elements of each insulation plate merge into each other at the corners between the edge sides such that no rectilinear passageways for moisture through the insulation wall are present in the joints between the interconnected insulation plates of the insulation wall, wherein the edge connecting elements of the insulation plates are arranged in such a way that the insulation plates of the insulation wall are interconnected by means of a connection selected from a tongue and groove joint, formed by said tongue and said groove, and a half lap joint, formed by said front ridge and said rear ridge, wherein at least one drainage channel is provided through the insulation wall for draining moisture penetrated between the insulation plates into the insulation wall, wherein the at least one drainage channel is composed of adjoining drainage channel sections of the interconnected insulation plates.

36. The insulation wall according to claim 35, wherein the at least one drainage channel through the insulation wall is arranged in a downward direction of the insulation wall.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0068] The invention will hereafter be further elucidated by means of the following description and the appended figures.

[0069] FIG. 1 shows a perspective view of the rear side of an insulation plate according to an embodiment of the present invention for constructing an insulation wall according to an embodiment of the present invention.

[0070] FIG. 2 shows a frontal view of the insulation plate of FIG. 1.

[0071] FIG. 3 shows a side-view of the edge side of the insulation plate of FIG. 1 provided with the rear ridge.

[0072] FIG. 4 shows a side-view of the edge side of the insulation plate of FIG. 1 provided with the groove.

[0073] FIG. 5 shows a partial side-view of two insulation plates similar to the insulation plate shown in FIG. 1, interconnected by means of a tongue and groove joint.

[0074] FIG. 6 shows a perspective view of the tongue and groove joint between two insulation plates similar to the insulation plate shown in FIG. 1, wherein certain details of the insulation plate were left out.

[0075] FIG. 7 shows a partial side-view of two insulation plates similar to the insulation plate shown in FIG. 1, interconnected by means of a half lap joint.

[0076] FIG. 8 shows a cross section of an adhesion groove in an insulation plate according to an embodiment of the present invention.

[0077] FIG. 9 shows a detail of a side view of the edge side provided with the rear ridge, of an insulation plate according to an alternative embodiment of the present invention.

MODES FOR CARRYING OUT THE INVENTION

[0078] The present invention will hereafter be described with respect to particular embodiments and with reference to certain drawings, though the invention is not limited thereto but only by the claims. The drawings presented are only schematic and are non-limiting. In the drawings, the dimensions of some of the elements may be exaggerated, meaning that they are not drawn to scale and are solely for illustrative purposes. The dimensions and the relative dimensions do not necessarily correspond to actual reductions to practice of the invention.

[0079] Furthermore, the terms first, second, third and the like in the description and in the claims are used for distinguishing between similar elements, and not necessarily for describing a sequential or chronological order. The terms are interchangeable under appropriate circumstances and the embodiments of the invention can operate in other sequences than those described or illustrated herein.

[0080] Moreover, the terms top, bottom, over, under and the like in the description and the claims are used for descriptive purposes, and not necessarily for describing relative positions. The terms so used are interchangeable under appropriate circumstances and the embodiments of the invention described herein can operate in other orientations than those described or illustrated herein.

[0081] The term comprising and terms derived from it, as used in the claims, should not be interpreted as being restricted to the means listed thereafter; it does not exclude other elements or steps. The term should be interpreted as specifying the stated features, integers, steps or components as referred to, but does not preclude the presence or addition of one or more other features, integers, steps or components, or groups thereof. Thus, the scope of the expression a device comprising means A and B should not be limited to devices consisting only of components A and B. It means that with respect to the present invention, the only relevant components of the device are A and B.

[0082] FIG. 1 shows a perspective view of the rear side 3 of an insulation plate 1 according to an embodiment of the present invention. The insulation plate 1 comprises a front side (not pictured), a rear side 3 and four edge sides 4. The insulation wall according to an embodiment of the present invention is composed of a plurality of such interconnected insulation plates 1. To allow the insulation plate 1 to be connected to other insulation plates 1, the insulation plate 1 is provided with an edge connecting element 5 on each of its edge sides 4. Thus, at one of its edge sides 4, the insulation plate 1 is provided lengthwise with a tongue 6 as the edge connecting element 5. This tongue 6 can be inserted into a groove 7 which is provided lengthwise on an edge side 4 of an adjacent insulation plate 1 in the insulation wall, thus forming a tongue and groove joint between both insulation plates 1. It should be noted that a tongue and groove joint is also known to persons skilled in the art as a tenon and groove joint, i.e., an alternative term is used for the tongue 6. The edge side 4 which is located opposite from the edge side 4 with the tongue 6, is provided lengthwise with a groove 7 or with side walls between which the groove 7 is located for forming a tongue and groove joint with a tongue 6 on an edge side 4 of an adjacent insulation plate 1 in the insulation wall. It should be noted that the groove 7 is also known to persons skilled in the art as a mortise. The two remaining edge sides 4 of the insulation plate 1 are provided lengthwise with a ridge 8, 9. The ridge 8 on one of these edge sides 4 is arranged in such a way that the ridge 8 is flush with or against the front side 2 of the insulation plate 1, and this ridge 8 is called the front ridge 8. The ridge 9 on the edge side 4, which is located opposite the edge side 4 with the front ridge 8, is arranged in such a way that the ridge 9 is flush with or against the rear side 3 of the insulation plate 1, and this ridge 9 is called the rear ridge 9. The ridges 8, 9 are arranged for forming a half lap joint with a ridge 8, 9 on the edge side 4 of an adjacent insulation plate 1 in the insulation wall. The tongue 6 of the insulation plate 1 is complementary to the groove 7, and the front ridge 8 is complementary to the rear ridge 9.

[0083] FIG. 1 also shows how the edge connecting elements 5 on the different edge sides 4 of the insulation plate 1 merge or transition into each other at the transition between adjacent edge sides 4, i.e., across the corners between adjacent edge sides 4. Thus, the front ridge 8 will only continue beyond the end of the edge side 4 provided with the front ridge 8 at the part of the adjacent edge side 4 where a protruding element of the edge connecting element 5 on the adjacent edge side 4 is present. In the case of the tongue 6, the tongue 6 itself is the protruding element of the edge connecting element 5, and in the case of the groove 7, the side walls are the protruding elements of the edge connecting element 5. The transition from the rear ridge 9 to the adjacent edge sides 4 occurs in the same way, but this is not shown in FIG. 1. And conversely, the tongue 6 and the side walls of the groove 7 will only continue at the positions where a ridge 8, 9 is located on the adjacent edge sides 4.

[0084] The rear side 3 of the insulation plate 1 is provided lengthwise with a plurality of adhesion grooves 15. These adhesion grooves 15 are arranged for receiving an adhesive (not pictured), such as for example glue or mortar, which is applied on the surface of the insulation plate 1 to affix wall cladding elements (not pictured), such as for example strip stones or tiles, to the insulation wall. The adhesion grooves 15 provide a better adhesion of the adhesive to the surface of the insulation plate 1 compared to an insulation plate 1 provided with a completely flat surface at the rear side 3. This is due to the fact that the adhesion grooves 15 provide a larger contact area for the adhesive and that the adhesive can engage the inside of the adhesion grooves 15. Furthermore, the adhesion grooves 15 are preferably also formed in such a way that once the adhesive has set, it cannot become detached from the adhesion grooves 15. In the embodiment example pictured here, the adhesion grooves 15 are provided to this end with a trapezoidal cross section, as shown in detail in FIG. 8. Hardened adhesive in the adhesion groove 15 cannot pass through the narrower entry aperture, located at the small base of the trapezoid shape, and engages the walls of the adhesion groove 15, which are located at the sides of the trapezoid shape. In the embodiment example pictured here, the adhesion grooves 15 have a wavelike shape, and thus follow a wavelike pattern. This allows longer adhesion grooves 15 to be provided at the rear side 3 of the insulation plate compared to rectilinear adhesion grooves 15 over the same distance, resulting in an even better adhesion of the adhesive to the insulation plate 1.

[0085] Furthermore, one or more circular recesses 17 are provided at the rear side 3 of the insulation plate 1, which are arranged for mounting anchors by means of which the insulation plate 1, and thus the insulation wall, is affixed to the wall of a building. These anchors are for example screws provided with a dish-shaped end. When affixing the insulation plate 1 against the wall of the building, the screw is then first screwed through the insulation plate 1, or alternatively passed through an anchor opening 18 arranged thereto in the insulation plate 1, after which the anchor's screw is further screwed into the wall of the building, optionally by means of a wall plug. The screw is screwed into the wall of the building until the dish-shaped end of the anchor is completely countersunk in the circular recess 17 in the insulation plate 1, the dish-shaped end thereby pressing the insulation plate 1 and thus the insulation wall firmly against the wall of the building. As the dish-shaped end of the anchor is capable of being countersunk in the circular recess 17 of the insulation plate 1 arranged thereto, this dish-shaped end will not hinder the application of the adhesive and the wall cladding elements onto the insulation wall.

[0086] FIG. 2 shows a frontal view of the insulation plate 1 of FIG. 1 in which the front side 2 of the insulation wall is visible. The front side 2 of the insulation plate 1 is provided, as is the rear side 3, with the lengthwise adhesion grooves 15, and also with the circular recesses 17 for the anchors having a central anchor opening 18 therein.

[0087] The front side 2 of the insulation plate is further also provided with rectilinear ridges 16 spaced apart at regular intervals. These ridges 16 serve as aids for the person skilled in the art to correctly align wall cladding elements to be affixed to the wall, and to provide the correct joint size between these wall cladding elements. As the insulation plate 1 of the embodiment example shown is provided at the front side 2 with the rectilinear ridges 16, but not at the rear side 3, the insulation plate can be used in two ways. The front side 2 of the insulation plate 1 can be used for affixing wall cladding elements to the insulation wall with joints in between, whereas the rear side 3 of the insulation plate 1 can be used for affixing wall cladding elements to the insulation wall with no joints or only very small joints in between. This has the advantage that one type of insulation plate 1 may be used, wherein, dependent on the choice to mount the wall cladding elements with or without joints, the insulation plates 1 need only to be reversed, for forming the insulation wall according to an embodiment of the present invention.

[0088] Furthermore, the front side 2 of the insulation plate 1 is also provided with auxiliary marker lines 19, which in the embodiment example shown in FIG. 2 are provided as rectilinear recesses in the crosswise direction of the insulation plate 1, and which are spaced apart at regular intervals. These auxiliary marker lines 19 may, among other uses, be used as cutting lines for trimming the insulation plates 1, for example for cutting out an opening through the insulation plate 1 to allow utility lines to pass through the insulation wall, or for cutting off a part of an insulation plate 1 located at the circumference of the insulation wall. These auxiliary marker lines 19 are also useful in fitting wall cladding elements to the insulation plate 1 before affixing the wall cladding elements. The rear side 3 of the insulation plate 1 may, like the front side 2, be provided with auxiliary marker lines 19, both in the lengthwise and in the crosswise direction of the insulation plate 1.

[0089] FIG. 3 shows a side-view of the insulation plate 1 shown in FIG. 1, wherein the side-view is directed at the edge side 4 on which the rear ridge 9 is located. This figure shows the front side 2 of the insulation plate 1 at the top, and the rear side 3 of the insulation plate 1 at the bottom. At the left side, the figure shows the edge side 4 of the insulation plate 1 provided with the tongue 6, and at the right side the figure shows the edge side 4 of the insulation plate 1 provided with the groove 7.

[0090] On both sides of the tongue 6, a drainage channel section 10 is visible, arranged as a semicircular recess along the longitudinal direction of the tongue 6. These drainage channel sections 10 constitute a part of the drainage channel through the insulation wall according to an embodiment of the present invention. The at least one drainage channel through the insulation wall is formed by causing the drainage channel sections 10, provided on the edge connecting elements 5 of the interconnected insulation plates 1, to adjoin each other at the ends of the drainage channel sections 10.

[0091] The drainage channel sections 10 in the embodiment example shown are located at both sides of the tongue 6, so that a drainage channel section 10 is always present on one side of the front ridge 8 or the rear ridge 9 on the adjacent edge sides. If the insulation plate 1 is then mounted with its front side 2 or rear side 3 against the wall of a building in constructing the insulation wall, with respectively the edge side 4 with the front ridge 8 or the edge side 4 with the rear ridge 8 directed upwards, one of the drainage channel sections 10 will always be provided at the upper end of a raised wall formed by the front ridge 8 or the rear ridge 9. This has the advantage that moisture penetrating the insulation wall is first drained away in this drainage channel section 10, and thus in the drainage channel, and that the passage of further penetrating moisture is blocked by the raised walls formed by the front ridge 8 or the rear ridge 9. Thus, the front ridge 8 or the rear ridge 9 hereby form a barrier against the moisture penetrating between the insulation plates 1 of the insulation wall. Any moisture penetrating even further into the insulation wall, beyond the raised wall, can subsequently still be drained away in the second drainage channel section 10.

[0092] The blocking of the passage of penetrating moisture is also apparent in the simplified depiction in FIG. 6, where two of the insulation plates 1 shown in FIG. 1 are interconnected by means of a tongue and, groove joint, and wherein the front ridges 8 are directed upwards. In this way, the insulation plates 1 can be mounted with their front sides 2 against a wall of a building for forming an insulation wall, wherein wall cladding elements can then be affixed to the rear side 3. Here, the front ridges 8 of the insulation plates 1 constitute the raised wall. As mentioned above, moisture penetrating between the insulation plates 1 into the insulation wall from the back side 3 is thus first drained away in the drainage channel section 10 located before the front ridges 8. The passage of moisture penetrating further is then blocked by the raised wall formed by the front ridges 8. Finally, any moisture penetrating beyond the raised wall can still be drained away in the second drainage channel section 10.

[0093] In the embodiment example pictured in FIG. 3, the drainage channel sections 10 are formed as a recess in the outer surface of the edge connecting element 5, namely the tongue 6, but the drainage channel sections 10 may also be provided as an internal channel through the edge connecting element 5, or as a combination of a recess in the outer surface and an internal channel. Moreover, the drainage channel section 10 does not necessarily need to be provided on the tongue 6, but may also be provided on the other edge connecting elements 5, such as the groove 7, the front ridge 8 and the rear ridge 9.

[0094] The tongue 6 is further also provided with two protrusions 12, which are complementary to the two recesses 11 provided in the side walls of the groove 7. These corresponding recesses 11 and protrusions 12 are arranged in such a way that the tongue 6 and the groove 7 on the edge sides 4 of two insulation plates 1 interconnected by means of a tongue and groove joint, snap together. Such a joint is shown in detail in FIG. 5.

[0095] Also visible in FIG. 3, at the front side 2 of the insulation plate 1, is one of the rectilinear and raised ridges 16 between which wall cladding elements can be affixed to the insulation plate 1, and thus to the insulation wall. Furthermore, both at the front side 2 and at the rear side 3 of the insulation plate 1, the recesses can be seen that constitute the auxiliary marker lines 19 on the insulation plate 1.

[0096] In FIG. 3, a small recess 11 is visible on the rear ridge 9 in the longitudinal direction. This recess 11 constitutes one of the complementary recesses 11 or protrusions 12 provided on the ridges 8, 9 of the insulation plate 1 so that the ridges 8, 9 of insulation plates 1 interconnected by means of a half lap joint snap together. Such a half lap joint between two insulation plates 1 is shown in FIG. 7.

[0097] FIG. 4 shows a side-view of the insulation plate 1 shown in FIG. 1, wherein the side-view is directed at the edge side 4 on which the groove 7 is located. This figure shows the front side 2 of the insulation plate1 at the top, and the rear side 3 of the insulation plate 1 at the bottom. At the left side, the figure shows the edge side 4 of the insulation plate 1 provided with the rear ridge 9, and at the right side the figure shows the edge side 4 of the insulation plate 1 provided with the front ridge 8.

[0098] The front ridge 8 is provided with protrusions 12 and a recess 11, which are complementary to recesses 11 and a protrusion 12 provided on the rear ridge 9. These corresponding recesses 11 and protrusions 12 are arranged in such a way that the ridges 8, 9 on the edge sides 4 of two insulation plates 1 interconnected by means of a half lap joint snap together. Such a joint is shown in detail in FIG. 7.

[0099] Visible at the front side 2 of the insulation plate 1 are, again, the rectilinear ridges 16 between which wall cladding elements can be affixed to the insulation plate 1, and thus to the insulation wall. Furthermore, both at the front side 2 and at the rear side 3 of the insulation plate 1, the adhesion grooves 15 can be seen that are provided for receiving an adhesive for wall cladding elements that is applied to the insulation plate 1.

[0100] Although in the embodiment example shown, no drainage channel section 10 is located on the ridges 8, 9, it should be clear that the ridges 8, 9, too, may be provided with a recess, an internal channel, or a combination of both for forming a drainage channel section 10. This drainage channel section 10 may be arranged in such a way that it is located in front of one of the sides of the tongue 6 on an adjacent edge side 4, or in such a way that it is located between the side walls of the groove 7 on an adjacent edge side 4. In this way, the tongue 6 or the side walls of the groove 7 can be used as a raised wall that forms a barrier against penetrating moisture.

[0101] Both FIG. 3 and FIG. 4 show how the insulation plate 1 is provided, at the circumference of the front side 2 and the rear side 3, with an indentation 13 formed by a stepwise sloping surface, followed by a flat end surface 14. Herein, a first part of, the stepwise sloping surface always has a smaller angle of inclination than the second part of the stepwise sloping surface, which is followed by the flat end surface 14. When two insulation plates 1, provided in this or any other way with an indentation 13 at the circumference of the front side 2 and/or the rear side 3, are joined together as shown in FIG. 5 or FIG. 7, a notch is formed in the plane constituted by the front sides or the rear sides of the insulation plates 1, at the joint between the insulation plates 1. In this notch, a sufficient amount of adhesive can be applied to bond the insulation plates 1 together and thereby strengthen the adhesion between the insulation plates 1. The adhesive applied has the additional advantage that the joint between both insulation plates 1 is also sealed against penetrating moisture. In the embodiment example shown, the flat end surface 14 constitutes the deepest point of the indentation 13, located at a predetermined depth in the indentation 13. This predetermined depth is chosen in such a way that a layer of adhesive can be applied in the indentation 13, and thus also in the notch, for forming a substantially fully watertight seal in the notch. It should be clear that this deepest point of the indentation does not necessarily need to be constituted by a flat end surface 14, but may also be provided in other ways.

[0102] In FIG. 9, an alternative embodiment of the insulation plate 1 is shown. Here, the indentation 13 at the circumference of the front side 2 and the rear side 3 of the insulation plate 1 is formed in a different way than that of the insulation plate shown in FIG. 1. At the front side 2 of the insulation plate 1, the indentation 13 is formed by a sloping surface followed by a stepwise surface, ending in a flat end surface 14. At the bottom side 3 of the insulation plate, the indentation 13 has a stepped shape which ends in a flat end surface 14. It should be clear, then, that there are different ways in which the indentation 13 may be implemented.

[0103] The thickness of the insulation plate 1 according to a preferred embodiment of the present invention can be chosen depending on the desired insulation rate of the insulation wall, wherein a thicker insulation wall offers better thermal insulating properties than a thin insulation wall.

LIST OF REFERENCE NUMBERS

[0104] 1 insulation plate [0105] 2 front side [0106] 3 rear side [0107] 4 edge side [0108] 5 edge connecting element [0109] 6 tongue [0110] 7 groove [0111] 8 front ridge [0112] 9 rear ridge [0113] 10 drainage channel section [0114] 11 corresponding recess [0115] 12 corresponding protrusion [0116] 13 indentation [0117] 14 end surface [0118] 15 adhesion groove [0119] 16 ridge [0120] 17 circular recess [0121] 18 anchor opening