Underground storage volume

Abstract

The present invention relates to a shaft body (10) for receiving water, comprising a first (12) and a second (14) individual element, wherein the two individual elements (12, 14) are stackable in a first and a second relative position to one another, wherein the second individual element (14) has an inspection opening (24), wherein, with respect to a respective coordinate system (KS) of the first individual element (12) and the second individual element (14), wherein the coordinate system (KS) of the first individual element (12) has its origin at a location on the first individual element (12) which is analogous to the location on the second individual element (14) at which the coordinate system (KS) of the second individual element (14) has its origin, a predetermined region of the second individual element (14) is provided with at least one reinforcing element formed integrally with the second individual element (14),from which the base element (18) of the first individual element (12) is free in an analogous area. Furthermore, the present invention relates to a corresponding trench arrangement.

Description

The present invention relates to a well body adapted to receive water in its interior to provide a subterranean storage volume. From the prior art shaft bodies are known which are configured to provide a subsurface storage volume for receiving water therein. Such storage volumes are advantageous in particular when larger regions of soil are sealed surface-water-impermeable, for example by an asphalt layer for forming parking spaces. Since the rainwater in such parking space installations can no longer ice uniformly in the ground, but instead now drains away in concentrated form at locations provided for this purpose, the drainage of large water masses has to be managed within a short time, in particular in heavy rain events. In addition, the existing channelling devices are often not designed for such water masses.For this reason, underground storage facilities, so-called "drainage boxes", can be provided, in which water can be temporarily stored in order to be able to supply it from there to the sewer system in a controlled manner.Depending on the size of the sealed surface and the amounts of water to be expected, such an underground storage volume can be composed of a multiplicity of individual elements which are arranged in a row and are designed to be water-permeable to one another. It has been found that in the case of drainage trench which comprises a plurality of horizontal layers of individual elements, it is precisely the individual elements arranged further down that have to be maintained or cleaned from time to time, since sediment carried along with the entering water, for example, can accumulate there, as a result of which the functioning of the drainage trench installation is impaired.There is therefore a need to provide in drainage facilities an access shaft which runs from the surface of the earth to the lowermost layer of individual elements of the drainage trench, so that a corresponding device can reach this lowermost layer of individual elements.In the case of prior art regalens, sections of existing individual elements are cut out for this purpose in order to produce such an access opening. Since the stability of a corresponding individual element is greatly influenced by removing these sections from the individual elements, the cut-out opening often has to be provided manually with a corresponding reinforcement, such as a metal frame. Both the cutting out and the reinforcing of the individual elements are time-consuming and costly and prone to errors.It is therefore the object of the present invention to provide a shaft body or a drainage trench arrangement in which or in which the inspection opening described at the beginning can be provided in a simplified manner.This object is achieved according to the invention by a shaft body which is configured to receive water in its interior in order to provide a underground storage volume, wherein a shaft body comprises a first and a second individual element, which each have a base element and at least one column protruding therefrom, wherein the two individual elements can be stacked one on top of the other in a first relative position with respect to one another, in which the at least one column of the first individual element and the at least one column of the second individual element extend away from their associated base element in a substantially identical direction, in such a way that the at least one column of the first individual element dips at least partially into the at least one column of the second individual element, wherein the two individual elements in a second relative position with respect to one another, in which the at least one column of the first individual element and the at least one column of the second individual element extend away from their associated base element in a substantially opposite direction, can be stacked on one another in such a way that the free ends of the columns point towards one another or abut one another in order to form the shaft body in its assembled state, wherein the second individual element has an inspection opening which extends through the base element of the second individual element in a substantially parallel direction to the direction of extension of the at least one column of the second individual element, characterized in that, with respect to a respective coordinate system of the first individual element and of the second individual element, wherein the coordinate system of the first individual element has its origin at a location of the first individual element which is analogous to that location of the second individual element, The base element of the first individual element is free of the second individual element in a region analogous thereto.In other words, it is provided in the present invention that the second individual element has an opening at a location at which the first individual element does not have this opening. However, since a reduction in the stability or the rigidity of the second individual element thus results in comparison to the first individual element, reinforcements are provided on the second individual element, which reinforcements are configured to reduce or even completely compensate the reduction in stability / rigidity of the second individual element caused by the inspection opening.The expression of a "location" of the first individual element, which is analogous to that location of the second individual element, can in this context describe in particular a location or a region which has the same coordinates on the first individual element and on the second individual element, provided that the respective coordinate system on the first individual element and on the second individual element has its origin at a location which is the same as one another. This can be achieved in a simple manner, for example, by positioning the origin of the coordinate system of the first individual element at a corner point or in a center of a simplified geometric shape which describes the basic element, for example a rectangle, in particular a square, and setting the origin of the coordinate system of the second individual element in a manner analogous thereto.In the case that the first individual element should have one or more columns at a location at which the second individual element has the inspection opening, the one or more columns can enter the inspection opening or pass through it. Depending on the size and / or shape of the opening and the arrangement and / or shape of the columns, the second individual element can then be stacked on the first individual element in the first relative position such that the basic elements of the two individual elements bear against one another or are at least closely adjacent to one another. For example, the basic elements of the two individual elements can be aligned substantially parallel to one another in the first relative position. The size / shape of the inspection opening and the arrangement / shape of the columns can also define a contact of the one or more columns on the inspection opening in such a way that a further pushing of the second individual element onto the first individual element can be prevented and an end stop of the two individual elements in the first relative position to one another can thus be defined.The two individual elements can also be stacked in the first relative position in such a way that the at least one column of the second individual element dips at least partially into the at least one column of the first individual element. For this purpose, at least the at least one column of the first individual element, in particular also the at least one column of the second element, can be hollow and open on one side, in particular that side which is opposite a free end of the column. For this purpose, the columns can be designed on their outer side and / or on their inner side to extend conically from their base on the base element towards their free end.The first individual element and / or the second individual element can comprise a plastic, in particular polypropylene and / or polyethylene.For example, the area of the (single, continuous) inspection opening, measured on a main extension surface, for example the underside, of the associated base element, can be from 15% to 40%, in particular from 20% to 30%, advantageously approximately 25%, of the area of the entire base element, measured on the same main extension surface. In such a surface view, a geometric extension of a simplified basic shape of the base element can be used, i.e. in particular, a complete surface is assumed, which is defined by an outer edge of the base element, without thereby taking into account at which locations of this surface the base element comprises material and at which locations recesses are provided.Furthermore, the volume and / or weight of the material which is present on the first individual element in the region of the inspection opening and is absent from the second individual element can be from 15% to 40%, in particular from 20% to 30%, advantageously approximately 25%, of the volume and / or weight of the first individual element. Even if the complete volume and / or weight which the second individual element does not have in the region of the inspection opening compared to the first individual element should be added to the second individual element by the provision of reinforcing elements, an identical total volume or total weight of the first individual element and of the second individual element results.In a further development of the present invention, the free ends of the columns can be configured to penetrate in sections into one another and / or to latch them to one another in the second relative position of the two individual elements to one another. Thus, the two individual elements can be arranged on one another in this predetermined mounting position in such a way that unintentional displacement of the two individual elements relative to one another, for example removal of the free ends of the columns from one another on account of a lateral displacement of the one individual element relative to the other individual element, can be prevented. For example, an inter-penetration can be achieved by a mutual engagement of projections and recesses.In particular, the predetermined region can be substantially square, wherein the edge length of the square can be selected such that a periphery of the square encloses a base surface of a column of the first individual element at a predetermined distance or that the square runs at least in sections on a base surface of a column of the first individual element. In this case, a base area of the column can be measured at a transition from the base element to the corresponding column. In the case of columns with a round cross section, "sectionwise" can naturally also mean "pointwise". In the case where the predetermined area is substantially square and closely surrounds a predetermined column, the center of gravity of the square predetermined area may be disposed on a central axis of an associated column.Furthermore, the region of the second individual element analogous to the predetermined region of the first individual element can comprise a section of the inspection opening, and a reinforced corner region of the inspection opening can be formed as a reinforcing element in the analogous region of the second individual element. Such a reinforcing element can also be referred to as a "train triangle". A reinforcing element formed in this way can be configured in particular to reinforce a respective corner region of the inspection opening, at which stress peaks can often result, in such a way that stresses occurring in the corner region can be absorbed more uniformly and dissipated into the surrounding material of the individual element.Alternatively or additionally, the region of the second individual element analogous to the predetermined region of the first individual element can have, as reinforcing element, at least partially an increased wall thickness of analogous sections of the two individual elements. That is to say that, in order to be able to at least partially compensate for the stability weakening of the second individual element caused by the inspection opening, the second individual element can be reinforced by a greater material use compared to analogous locations of the first individual element. The increased wall thickness of the reinforcing element of the second individual element can be increased, for example, by 10% to 100%, in particular by 30% to 70%, in comparison with the wall thickness of the analogous wall element of the first individual element.Again alternatively or additionally, the region of the second individual element analogous to the predetermined region of the first individual element can have at least one additional wall element of the base element as a reinforcing element. For example, the base element can comprise a plurality of profiles and wall elements, which can be arranged in particular in an orthogonal or parallel direction to the main surfaces of the base element. In the case described above, the second individual element can now have at least one additional wall element which is not formed at the analogous location of the first individual element.In this case, the at least one additional wall element, which is present only on the base element of the second individual element, can connect those sections which are present both on the base element of the first individual element and on the base element of the second individual element to form a profile with a substantially U-shaped cross section. This U-shaped cross section can be obtained in particular as viewed in a sectional plane which is orthogonal to a main surface of the base element, such as for example the outer surface of the base element which is opposite to that surface of the base element from which the at least one column extends towards its free end.In this context, the profile with a substantially U-shaped cross section along at least one of the edges formed by the free ends of the U-shape can have, at least in sections, a wall element protruding orthogonally to the associated limb of the U-shape. This wall element, which is arranged at at least one free end of the U-shape of the cross section of the profile and projects orthogonally relative to the associated limb of the U-shape, in particular outwardly relative to the U-shape, can, for example, prevent the wall element, which is formed by one of the two free limbs of the U-shape, from being displaced out of its unloaded extension upon loading of the profile. If the wall element, which is formed by one of the two free legs of the U-shape of the profile, runs, for example substantially linearly, a load on the profile, that is to say of the individual element, in this region can lead to the wall element being deformed and, for example, bulging out. The orthogonally protruding wall element, which is arranged at the free end of the U-shape, can prevent such a deformation.The inspection opening can be formed in particular during the forming of the second individual element. In other words, the inspection opening is thus not formed by a downstream assembly step in which the inspection opening is introduced into the second individual element, that is to say predetermined regions are removed from the second individual element, but rather the inspection opening can be formed directly in the production step in which the remaining second individual element is also formed. This can be seen from the final product, for example, by the fact that no cut edges or separating tracks are found in the region of the inspection opening, as can be seen, for example, when using a saw on the remaining material.For example, the second single element may be formed using an injection molding method. Analogously, the first individual element can also be formed using an injection molding method. In this case, different injection molds can be used for forming the first individual element and for forming the second individual element. Alternatively, the same injection molds can be used for the formation of the first individual element and the formation of the second individual element, which can be provided with corresponding inserts in order to be able to form sections in which the first individual element and the second individual element differ in a correspondingly different manner.Advantageously, the at least one column of the respective individual element can extend tapering from the base element towards its free end, and a wall of the base element of the second individual element surrounding the inspection opening can have an angle relative to a main surface of this base element at least in sections. The expression "tapering" can mean, in particular, that two mutually parallel cross sections, the sectional planes of which are arranged orthogonally to a main direction of extent or a central axis of the column, become smaller the closer a respective cross section is arranged adjacent to the free end of a column.Advantageously, the angle can be substantially equal to an angle which a section of an outer side of the column forms relative to a main surface of the associated basic element, so that, in the second relative position of the two individual elements to one another, the angled wall of the basic element of the second individual element surrounding the inspection opening runs substantially parallel to an adjacent outer surface of a column of the first individual element. Thus, the wall surrounding the inspection opening can bear essentially flat against an outer side of a column when two individual elements are stacked one on top of the other, whereby the stacking ability of the two individual elements can be improved and damage to the individual elements, for example during transport, can be prevented. In order to achieve this, it may be sufficient that the angle of the wall of the base element of the second individual element surrounding the inspection opening is substantially equal to an angle which is formed between an outer side of a column of the first individual element and a main surface of the base element of the first individual element, since only in the case when a second individual element is stacked on the columns of a first individual element in order to achieve the first relative position is the situation achieved that at least one column passes through the inspection opening and can abut against the wall surrounding the inspection opening. However, in order to achieve the greatest possible correspondence between the first individual element and the second individual element, the foregoing can also apply to the at least one column of the second individual element.Furthermore, the predetermined region of the base element of the first individual element can have apertures which are formed closed in the region of the second individual element analogous thereto. That is to say, in the case that, for example, perforations are provided in wall elements of the predetermined region of the first individual element, in order to enable, for example, water to flow through this wall element, the analogous wall elements of the predetermined region of the second individual element can be formed with fewer perforations and / or smaller perforations or even without perforations, in order to increase the stability of the second individual element at least in the predetermined region thereof.The first individual element and / or the second individual element can have a roadway which is suitable for being traveled on by a device, such as an inspection device or a cleaning device. Such a roadway can be arranged in particular on the base element, advantageously on that main extension surface of the base element from which the at least one column extends toward its free end. On the second individual element, the roadway can optionally be formed only partially due to the inspection opening. The roadway can be formed, for example, by an increased distance of columns adjacent to one another (in comparison to adjacent columns of the same individual element between which no roadway is formed) and / or by a surface of the base element in this region which, with the exception of perforations, is of planar configuration. The perforations can be at most 30%, in particular at most 20%, advantageously at most 10%, of the total area of the roadway.In order to secure the two individual elements of a shaft body stacked in the second relative position in this position, an intermediate element can be arranged, which in particular encloses the free ends of the columns of the first individual element and of the second individual element. The intermediate element can absorb forces introduced into the shaft body laterally, in particular horizontally, and can introduce these forces, for example, to an adjacent intermediate element of an adjacent shaft body. A shaft body located on the outside of a drainage trench arrangement can then introduce these forces into the soil, for example. The intermediate element can have an inspection opening which is advantageously substantially identical to the inspection opening of the second individual element in terms of position, shape and size.In a further aspect of the present invention, the object mentioned at the beginning is achieved by a drainage trench arrangement which comprises at least one first and at least one second individual element, in particular a shaft body according to the invention, which each have a base element and at least one column protruding therefrom, wherein the two individual elements can be stacked on one another in a first position relative to one another, in which the at least one column of the first individual element and the at least one column of the second individual element extend away from their associated base element in a substantially identical direction, in such a way that the at least one column of the first individual element dips at least partially into the at least one column of the second individual element, wherein the two individual elements in a second position relative to one another, in which the at least one column of the first individual element and the at least one column of the second individual element extend away from their associated base element in a substantially opposite direction, can be stacked on one another in such a way that the free ends of the columns point towards one another or abut one another in order to form the shaft body in its assembled state, wherein the second individual element has an inspection opening which extends through the base element of the second individual element in a substantially parallel direction to the direction of extension of the at least one column of the second individual element, characterized in that, with respect to a respective coordinate system of the first individual element and of the second individual element, wherein the coordinate system of the first individual element has its origin at a location of the first individual element which is analogous to that location of the second individual element, The base element of the first individual element is free of the second individual element in a region analogous thereto.It should already be pointed out at this point that all features, effects and advantages mentioned with respect to the shaft body according to the invention can also be applicable to the drainage trench arrangement according to the invention, and vice versa.The drainage trench arrangement according to the invention can in particular comprise a multiplicity of first and second individual elements which are assembled to form an underground storage volume. In this case, two first individual elements or two second individual elements can be combined to form a shaft body or a first and a second individual element can be combined to form a shaft body.If two first individual elements are thus stacked one on top of the other in the second relative position, a shaft body is produced which does not have an inspection opening. If, viewed in the direction of gravity, a second individual element is attached in the second position relative to one another via a first individual element, a shaft body is produced which has an inspection opening on its upper side in order to allow access into this shaft body. If two second individual elements are stacked one on top of the other in the second relative position, a shaft body is produced which has an inspection opening which completely passes through the shaft body. This shaft body itself and also a shaft body lying beneath it can thus be made accessible from an upper side for an inspection device or a cleaning device.In particular, viewed in the direction of gravity, a first individual element can follow a sequence of one or more second individual elements. In the case that the drainage trench arrangement has more than one substantially horizontal plane of shaft bodies, further shaft bodies can be arranged above such a shaft body consisting of a lower first and an overlying second individual element, said shaft bodies being formed from two second individual elements in order to form an inspection opening which is continuous on the surface of the earth from an interior of the lowermost shaft body as far as access to the drainage trench arrangement, that is to say a sequence of respective inspection openings of the shaft bodies or of the individual elements.Arranging a first individual element on an outer side of the drainage trench arrangement such that the at least one column of the first individual element protrudes into the interior of the drainage trench arrangement can provide the advantage that the base element of the first individual element, which then forms a section of the outer side of the drainage trench arrangement, does not have an inspection opening, such that said basic element can provide an improved support for a material, such as a nonwoven, enclosing the drainage trench arrangement. The material enclosing the drainage trench arrangement can be designed in particular such that it allows water to pass from the drainage trench arrangement into surrounding soil, but prevents solids, such as soil, from entering the drainage trench arrangement.Hereinafter, the present invention will be described in more detail by way of an embodiment with reference to the accompanying drawings. It represents: FIG. 1 shows a perspective view of a shaft body according to the invention; FIG. 2 shows a top view of a first individual element; FIG. 3 is a top view of a second individual element; FIG. 4 shows a detailed view of a section of the first individual element; FIG. 5 shows a detailed view of a section of the second individual element; FIG. 6 shows a further detail view of a section of the first individual element; FIG. 7 shows a further detail view of a section of the second individual element; and FIG. 8 shows a side cross-sectional view of a first individual element and a second individual element in their first position relative to one another.In FIG. 1, a shaft body according to the invention is generally denoted by the reference numeral 10. The shaft body 10 comprises a first individual element 12 and a second individual element 14, which are stacked one on top of the other in a first relative position in FIG. 1 such that respective free ends of columns 16, which extend away from a base element 18 of the first individual element 12, and of columns 20, which extend away from a base element 22 of the second individual element 14, abut one another. In this way, a storage volume is formed in the interior of the shaft body 10, in which storage volume water can be absorbed.The second individual element 14 has an inspection opening 24, which in the embodiment shown here is arranged centrally on the base element 22 of the second individual element 14 and passes through the latter completely. Thus, the hopper body 10 can be made accessible from an upper side shown in FIG. 1 to an apparatus such as an inspection apparatus or a cleaning apparatus. The device can be moved along a roadway 26 which is formed on the base element 18 of the first individual element 12. Such a roadway 26 can also be formed on the base element 22 of the second individual element 14, but possibly only partially because of the inspection opening 24.It can also be seen in FIG. 1 that in a region in which the free ends of the columns 16 and 20 abut each other, an intermediate element 28 is arranged, which is configured to prevent unintentional detachment of the first individual element 12 and the second individual element 14 from each other from the second relative position to each other.The shaft body 10 illustrated in FIG. 1, which has a first individual element 12 on its lower side and, arranged above it, a second individual element 14 in the second position relative to one another, can be, in particular, a shaft body 10 of a lowermost layer of shaft bodies of a drainage trench arrangement. In this case, above the shaft body 10 shown in FIG. 1, in particular further shaft bodies can be arranged, which have two second individual elements 14 in the second relative position to one another, so that from an upper side of the drainage trench arrangement, which is arranged for example on the surface of the earth, a continuous access opening is formed in the sense of a sequence of individual inspection openings 24 of the respective second individual elements 14, so that the lowermost layer of shaft bodies of the drainage trench arrangement is also accessible from the surface of the earth. Since such access openings are only necessary at predetermined locations of the drainage trench arrangement, depending on the size of the drainage trench arrangement, all remaining shaft bodies, at which no such access opening is to be provided, can be formed from a combination of two first individual elements 12.In FIGS. 2 and 3, a plan view of a first individual element 12 and of a second individual element 14, i.e. a plan view of the free ends of the respective columns 16 and 20 thereof, is illustrated. As described above, it can be seen that the second individual element 14 has the inspection opening 24 and that the first individual element 12 does not have such an inspection opening. However, it can also be seen in FIGS. 2 and 3 that the base element 18 of the first individual element 12 and the base element 22 of the second individual element 14 differ from one another in detail regions, namely in such a way that the base element 22 of the second individual element 14 has reinforcing elements which are configured to at least partially compensate for a weakening of the stability of the second individual element 14 which is caused by the inspection opening 24.If, for example, a first predetermined region A 1 of the first individual element 12 is considered in comparison with an analogous predetermined region A 2 of the second individual element 14, which are illustrated as detailed views in FIGS. 4 and 5, it can be seen that additional wall elements 30 and 32, from which the predetermined region A 1 of the first individual element 12 is free, are arranged in the predetermined region A 2 of the second individual element 14. The additional wall element 32 here extends substantially in a plane which is oriented in the left-right direction and perpendicular to the plane of the sheet in FIG. 5. The additional wall element 30, on the other hand, extends here substantially in a plane which is oriented parallel to the plane of the leaf in FIG. 5. Thus, the additional wall element 30 connects wall elements adjacent thereto, which are also formed on the first individual element 12, and bridges an opening. In cross section, a U-shape is formed by the additional wall element 30 and the two adjacent wall elements, which are also formed on the first individual element 12.It should be noted here that the predetermined regions A 1 and A 2 are arranged analogously on the respective base element 18 or 22 in such a way that they have identical coordinates with respect to respective coordinate systems KS of the first individual element 12 and of the second individual element 14, wherein the respective coordinate systems KS have their origin at exactly the same locations of the first individual element 12 and of the second individual element 14. In the case shown here, the basic elements 18 and 22 have a square basic shape and the respective coordinate systems KS have their origin at an intersection point of the two main diagonals of the square basic shape, taken on a plane which describes the main extension surface of the basic elements 18 and 22 which is opposite to the main extension surface of the basic elements 18 and 22 from which the columns 16 and 20 extend towards their free ends.It can also be seen in further exemplary predetermined regions B 1 and B 2 of the first individual element 12 and of the second individual element 14, which are illustrated in detail in FIGS. 6 and 7, that the predetermined region B 2 of the second individual element 14 has an additional wall element 34 as reinforcing element, which is not present in the predetermined region B 1 of the first individual element 12.In addition, it can be seen in FIGS. 2 and 3 that the second individual element 14 has reinforcing elements 36 in the corner regions of the inspection opening 24, which reinforcing elements are designed here as so-called tensile triangles and are configured to reinforce a respective corner region of the inspection opening 24 in such a way that loads which occur at the corner regions can be introduced more uniformly into surrounding material and thus load peaks at the corner regions can be reduced. In comparison, a region on the first individual element 12 which is analogous to the predetermined region of the second individual element 14 on which the reinforcing elements 36 are arranged is formed substantially free of material, since here the corner region of the polygonal basic shape of the column 16 which is offset radially inward with respect to a central axis of a respective column 16 is arranged.FIG. 8 shows a side cross-sectional view of a first individual element 12 and a second individual element 14, wherein the second individual element 14 is stacked on the first individual element 12 in a first relative position such that a column 16 of the first individual element 12 has entered an interior of a corresponding column 20 of the second individual element 14. In this first relative position, the individual elements 12 and 14 are arranged in a very space-saving manner with respect to one another and can thus be transported in a space-optimized manner.It can also be seen in FIG. 8 that a wall 38 which surrounds and delimits the inspection opening 24 is formed at an angle such that its angled orientation substantially corresponds to an angle at which the columns 16 taper from the base element 18 towards their free end. In this way, the wall 38 of the inspection opening 24 can lie flat against an outer side of the column 16 and damage to the column 16 and / or the wall 38 surrounding the inspection opening 24 can be prevented.

Claims

A shaft body (10) which is configured to receive water in its interior in order to provide a underground storage volume, wherein a shaft body (10) comprises a first (12) and a second individual element (14), which each have a base element (18, 22) and at least one column (16, 20) protruding therefrom, wherein the two individual elements (12, 14) can be stacked one on top of the other in a first relative position with respect to one another, in which the at least one column (16) of the first individual element (18) and the at least one column (20) of the second individual element (14) extend away from their associated base element (18, 22) in a substantially identical direction, in such a way that the at least one column (16) of the first individual element (12) dips at least partially into the at least one column (20) of the second individual element (14), wherein the two individual elements (12, 14) in a second relative position with respect to one another, in which the at least one column (16) of the first individual element (12) and the at least one column (20) of the second individual element (14) extend away from their associated base element (18, 22) in a substantially opposite direction, can be stacked on one another in such a way that the free ends of the columns (16, 20) face one another or abut one another in order to form the shaft body (10) in its assembled state, wherein the second individual element (14) has an inspection opening (24) which extends through the base element (22) of the second individual element (14) in a substantially parallel direction to the direction of extension of the at least one column (20) of the second individual element (14), characterized in that, with respect to a respective coordinate system (KS) of the first individual element (12) and of the second individual element (14), wherein the coordinate system (KS) of the first individual element (12) has its origin at a location of the first individual element (12) which is analogous to the location of the second individual element (14) at which the coordinate system (KS) of the second individual element (14) has its origin, a predetermined region (A2, B2) of the second individual element (14), in particular a predetermined region (A2, B2) of the base element (22) of the second individual element (14), is provided with at least one reinforcing element (30, 32, 34, 36) which is formed integrally with the second individual element (14) and from which the base element (18) of the first individual element (12) is free in a region (A1, B1) analogous thereto.Shaft body (10) according to claim 1, characterised in that the free ends of the columns (16, 20) are configured to penetrate into one another in sections and / or to latch them to one another in the second relative position of the two individual elements (12, 14).Shaft body (10) according to one of the preceding claims, characterized in that the predetermined region (A1, A2, B1, B2) is substantially square, wherein the edge length of the square is selected such that a periphery of the square encloses a base surface of a column (16) of the first individual element (12) at a predetermined distance or that the square runs at least in sections on a base surface of a column (16) of the first individual element (12).Shaft body (10) according to one of the preceding claims, characterized in that the region (A2, B2) of the second individual element (14) which is analogous to the predetermined region (A1, B1) of the first individual element (12) comprises a section of the inspection opening (21), and in that a reinforced corner region of the inspection opening (24) is formed as a reinforcing element (36) in the analogous region (A2, B2) of the second individual element (14).Shaft body (10) according to one of the preceding claims, characterized in that the region (A2, B2) of the second individual element (14) analogous to the predetermined region (A1, B1) of the first individual element (12) has, as reinforcing element, at least partially an increased wall thickness of analogous sections of the two individual elements (12, 14).Shaft body (10) according to one of the preceding claims, characterized in that the region (A2, B2) of the second individual element (14) which is analogous to the predetermined region (A1, B1) of the first individual element (12) has at least one additional wall element (30, 32, 34) of the base element (22) as reinforcing element.Shaft body (10) according to the preceding claim, characterized in that the at least one additional wall element (30, 32, 34), which is present only on the base element (22) of the second individual element (14), connects those sections, which are present both on the base element (18) of the first individual element (12) and on the base element (22) of the second individual element (14), to form a profile having a substantially U-shaped cross section.Shaft body (10) according to the preceding claim, characterized in that the profile with a substantially U-shaped cross section along at least one of the edges which are formed by the free ends of the U shape has, at least in sections, a wall element which protrudes orthogonally with respect to the associated limb of the U shape.Shaft body (10) according to one of the preceding claims, characterized in that the inspection opening (24) is formed during the forming of the second individual element (14).Shaft body (10) according to one of the preceding claims, characterized in that the second individual element (14) is formed using an injection moulding method.Shaft body (10) according to one of the preceding claims, characterized in that the at least one column (16, 20) of the respective individual element (12, 14) runs in a tapering manner from the base element (18, 22) towards the free end thereof, and in that a wall (38) of the base element (22) of the second individual element (14) surrounding the inspection opening (24) has an angle relative to a main surface of this base element (22) at least in sections.Shaft body (10) according to the preceding claim, characterized in that the angle is substantially equal to an angle which a section of an outer side of the column (16, 20) forms relative to a main surface of the associated base element (18, 22), so that, in the second position of the two individual elements (12, 14) relative to one another, the angled wall (38) of the base element (22) of the second individual element (14) surrounding the inspection opening (24) runs substantially parallel to an adjacent outer surface of a column (16) of the first individual element (12).Shaft body (10) according to one of the preceding claims, optionally according to one of Claims 7 or 8, characterized in that the predetermined region (A1, B1) of the base element (18) of the first individual element (12) has apertures which are formed closed in the region (A2, B2) of the second individual element (14) analogous thereto.A drainage trench arrangement which comprises at least one first (12) and at least one second (14) individual element, in particular a shaft body (10) according to one of the preceding claims, which each have a base element (18, 22) and at least one column (16, 20) protruding therefrom, wherein the two individual elements (12, 14) can be stacked one on top of the other in a first position relative to one another, in which the at least one column (16) of the first individual element (12) and the at least one column (20) of the second individual element (14) extend away from their associated base element (18, 22) in a substantially identical direction, in such a way that the at least one column (16) of the first individual element (12) dips at least partially into the at least one column (20) of the second individual element (14), wherein the two individual elements (12, 14) in a second position relative to one another, in which the at least one column (16) of the first individual element (12) and the at least one column (20) of the second individual element (14) extend away from their associated base element (18, 22) in a substantially opposite direction, can be stacked on one another in such a way that the free ends of the columns (16, 20) face one another or abut one another in order to form the shaft body (10) in its assembled state, wherein the second individual element (14) has an inspection opening (24) which extends through the base element (22) of the second individual element (14) in a substantially parallel direction to the direction of extension of the at least one column (20) of the second individual element (14), characterized in that, with respect to a respective coordinate system (KS) of the first individual element (12) and of the second individual element (14), wherein the coordinate system (KS) of the first individual element (12) has its origin at a location of the first individual element (12) which is analogous to the location of the second individual element (14) at which the coordinate system (KS) of the second individual element (14) has its origin, a predetermined region (A2, B2) of the second individual element (14), in particular a predetermined region (A2, B2) of the base element (22) of the second individual element (14), is provided with at least one reinforcing element (30, 32, 34, 36) which is formed integrally with the second individual element (14) and from which the base element (18) of the first individual element (12) is free in a region analogous thereto.Drain trench arrangement according to claim 14, characterised in that, viewed in the direction of gravity, a first individual element (12) adjoins a sequence of one or more second individual elements (14).

Images