GB2452028A

GB2452028A - Drainage kerb assembly

Info

Publication number: GB2452028A
Application number: GB0715249A
Authority: GB
Inventors: Chris Rothery
Original assignee: Pipeline and Drainage System Ltd
Current assignee: Pipeline and Drainage System Ltd
Priority date: 2007-08-06
Filing date: 2007-08-06
Publication date: 2009-02-25
Anticipated expiration: 2027-08-06
Also published as: GB2452028B; GB0715249D0

Abstract

The drainage kerb assembly, particularly for use on bridges, elevated highways and other structures susceptible to expansion, comprises two kerb drainage units 1, each with a trough 6 with open ends and a cap 7, and a channel 11 that connects the two drainage units which includes an expansion joint 12 and has an internal transverse cross-section which is aligned with and matches the transverse internal cross-sections of the troughs. The transverse cross-section of the troughs and channel are preferably square or rectangular and substantially uniform along their length. The expansion joint is preferably formed from an elastomeric insert 15 or sleeve which connects first and second channel sections 13,14 located between the drainage units. Also claimed is a channel for use in a drainage system and a method of providing a kerb drainage system.

Description

O 1 2452028 Drainage Assembly The present invention relates to a drainage kerb assembly and to a channel for use in a drainage kerb assembly.

It is well known that kerbs are laid along the edges of roads, driveways, paths and/or lawns or grassed areas. Kerbs typically restrain unbound construction material and help to prevent horizontal displacement of the material from which the roads, driveways, paths and/or lawns or grassed areas are constructed, for example when loads are applied to them.

In some locations, kerbs must be capable of accommodating movement of the construction material along which they are laid without the occurrence of any substantial distortion of the kerb. This is the case for example when a kerb is laid on a bridge or elevated highway. In such a location, a kerb must be capable of accommodating movement such as expansion and/or contraction of the construction material and/or accommodating longitudinal and/or rotational movement of that material. This typically is achieved by providing an expansion joint along the length of the kerb, for example between units of the kerb. An expansion joint is a joint that makes allowance for the movement of the joined parts without distortion, for example by absorbing expansion and contraction of construction materials.

Additionally, in some locations, kerbs must provide for the drainage of a surface and/or sub-surface fluid, such as water. This typically is achieved by providing a kerb comprised of a suitable number of drainage units. Such drainage units typically are hollow and comprise a drainage or waterway channel through which the fluid flows to a suitably located outlet. The fluid typically drains or flows from the surrounding area into the drainage or waterway channel through suitably sized and arranged slots and/or openings located in the wall(s) of the drainage units.

Typically, in use, the drainage or waterway channel is located beneath the surface of the ground in which the units are laid. Examples of drainage kerbs are provided for example in GB-i,284,395 and GB-l,132,002.

Of course, in some locations, a kerb needs to both accommodate movement of construction material as discussed above, as well as providing for the drainage of a surface and/or sub-surface fluid, such as water. In such instances, a kerb may be provided that comprises drainage units as discussed above and that is adapted for * 2 accommodating movement. This may be achieved by incorporating an expansion joint into a kerb comprising a suitable number of drainage units.

GB-A-2,205,600 discloses a drainage means comprising at least two drain units spaced apart and connected together by a pipe which permits water to pass from the hollow of one drain unit to the hollow of the other drain unit. The pipe is connected to the drain units by a connecting means which may comprise a hollow spigot including a sealing engagement that permits limited movement of the pipe in any direction relative to the adjacent drain unit without breaking the seal. The pipe and spigot are hollow cylinders of generally circular transverse cross-section. The drainage means described in GB-A-2,205,600 does not provide for a constant rate of flow of the fluid through the drain units and the pipe which connects them. In the drainage means of GB-A-2,205,600, the circular pipe restricts or slows the flow of the fluid, which inhibits the drainage means from functioning as desired and can cause blockages and flooding in the areas of the drainage means. Additionally, the drainage means is difficult to inspect and/or to clean, for example due to pipe having a small cross-section compared to the drain units.

Thus, it would be desirable to provide a kerb assembly that comprises an expansion joint whilst also providing adequate drainage, for example without any substantial restriction of the fluid flow and/or any flooding.

According to one aspect of the present invention, there is provided a drainage kerb assembly comprising: (i) two kerb drainage units, each kerb drainage unit comprising a trough having open ends and a cap; and (ii) a channel comprising an expansion joint, wherein the channel is adapted to connect the troughs of the two kerb drainage units so as to provide a fluid flow path therebetween, and wherein the channel has an internal surface with a transverse cross-section aligned with and matching the transverse internal cross-section of each of the troughs.

The drainage kerb assembly of the present invention provides for the flow of a fluid, such as water, therethrough and the assembly therefore is hollow. The drainage kerb assembly preferably provides for drainage of a surface and/or sub-surface fluid, such as water, from the ground to an outlet provided at a suitable location. * 3

The drainage kerb assembly of the present invention provides very real advantages in use. For example, the drainage kerb assembly provides improved drainage, which minimises and/or removes the risk of flooding, whilst accommodating movement of constructional material as desired. The drainage kerb assembly maintains a substantially constant flow rate as a fluid flows into the trough of a first kerb drainage unit, through the channel and into the trough of an adjacent second kerb drainage unit. The constant flow rate is provided by the matching of the transverse cross-section of the internal surface of the channel with the transverse internal cross-section of each of the troughs of the kerb drainage units. In other words, the drainage kerb assembly maintains the hydraulic flow through the channel and the troughs of the kerb drainage units. Additionally, the drainage kerb assembly of the present invention does not require additional parts (such as secondary metal sleeving) in use, for example for protecting the channel.

The drainage kerb assembly comprises two kerb drainage units. A person skilled in the art would readily understand what is meant by a "kerb drainage unit" and any conventional kerb drainage unit may be used in the kerb drainage assembly of the present invention. The kerb drainage units may be of any suitable dimensions, such as any suitable length.

Each kerb drainage unit functions as a kerb in restraining unbound construction material and also as a drain, preferably by draining a surface and/or sub-surface fluid from the ground. The kerb drainage unit is hollow and comprises a drainage or waterway channel through which the fluid flows to a suitably located outlet. The kerb drainage unit comprises a trough having open ends, which trough provides the drainage or waterway channel through which the fluid flows. Thus, the trough provides a means for the collection and flow of the fluid. Typically, the trough has a transverse internal cross-section that is of a substantially rectangular or square shape. The kerb drainage unit further comprises a cap. The cap is located on the trough so as to provide a lid or cover over the trough. Preferably the cap and trough are integrally formed, but this is not essential.

One or more walls of the kerb drainage unit preferably comprises a suitable number of openings and/or slots suitably sized and arranged to enable flow of a surface and/or sub-surface fluid, such as water, into the trough. In particular, the openings and/or slots are located in a single side wall of the kerb drainage units, i.e. the side wall that is exposed in use of the kerb drainage assembly (the other side * 4 wall typically being in contact with the construction material at the location at which the kerb drainage assembly is laid in use). For example, a wall of the cap (especially a side wall) typically comprises a suitable number of openings suitably sized and arranged to enable flow of a surface fluid, such as water, from the ground into the trough. A wall of the trough (especially a side wall) typically comprises a suitable number of slots suitably sized and arranged to enable flow of a sub-surface fluid, such as water, into the trough. The number of openings and/or slots provided depends on the length of the kerb drainage unit and the particular location at which it is intended to lay the kerb drainage unit, but a typical number may be from 1 to 10, more particularly from 3 to 8, for example 6. The openings and/or slots may be equally spaced along the wall (especially the side wall) of the kerb drainage unit, or the openings and/or slots may be unequally spaced. The openings and/or slots may be located (equally or unequally spaced) along the entire length of the wall (especially the side wall) of the kerb drainage unit or they may be located (equally or unequally spaced) along only a portion of the entire length of the wall. For example, the openings and/or slots may be located along a portion of the length of the wall (especially the side wall) of the kerb drainage unit that is remote from the end of the kerb drainage unit at which the trough is connected to the channel. This arrangement may be advantageous as it ensures no expulsion of a fluid from the kerb drainage unit in the region directly adjacent to the channel. When present, the aforementioned openings and/or slots may be provided in one or both (preferably in both) of the two kerb drainage units that are connected by the channel.

A kerb drainage unit typically is of a similar size and shape to a standard kerb unit. The size and shape of the kerb drainage unit depends on the specific requirements of the location at which it is to be laid, but standard sizes and shapes of kerb and kerb drainage units would be well known to a person skilled in the art.

The drainage kerb assembly comprises a channel comprising an expansion joint. The channel is adapted to connect the troughs of the two kerb drainage units so as to provide a fluid flow path therebetween. In other words, the troughs are spaced apart and connected by the channel. Thus, the troughs of the two kerb drainage units and the channel that connects the troughs provide a fluid flow path.

The channel therefore is hollow and typically is defined by four walls (for example which four walls may define a substantially rectangular or square transverse internal cross-section). The channel has an internal surface with a transverse cross-section aligned with and matching the transverse internal cross-section of each of the * 5 troughs. In particular, the transverse cross-section of the internal surface of the channel is aligned with and matches the transverse internal cross-section of each of the troughs at the open end connected to the channel. For example, the channel may be connected by each of its open ends to an open end of each of the troughs, such that the transverse internal cross-sections of the ends of the channel and an end of each of the troughs are aligned with and connected to each other.

The drainage kerb assembly may further comprise one or more additional kerb drainage units and/or kerb units adapted to attach to the two kerb drainage units of the kerb drainage assembly at their open ends, i.e. at their ends not connected to the channel of the kerb drainage assembly.

The references herein to the transverse cross-section of the internal surface of the channel are intended to refer to the cross- section provided by the internal surface (or wall) which defines the inner space or cavity in the hollow channel.

Similarly, the references herein to the transverse internal cross-section of the trough are intended to refer to the cross-section provided by the internal surface (or Wa!!) which defines the inner space or cavity of the trough that defines the fluid flew path. The skilled person would appreciate however that the trough typically does not include a surface (or wall) around its entire periphery. In other words, the periphery of the trough typically includes a section (such as an upper section in use of the kerb drainage assembly) that defines an opening for collection of the fluid therein. In other words, the upper section of the trough (in use) typically is open to allow the fluid to enter and collect in the trough.

By the term umatching in relation to the transverse internal cross-sections of the channel and the troughs of the kerb drainage units, we mean that these cross-sections are of a shape and size that are substantially the same. As the skilled person would appreciate, the term matching" may mean that the aforementioned cross-sections are of exactly the same size and shape, but does not necessarily do so. Some difference in the shape and size of the cross-sections may be tolerated, provided that the rate of fluid flow through the drainage kerb assembly remains essentially constant. Preferably, a maximum of a 5% difference in the shape and size of the transverse internal cross-sections of the channel and the troughs of each of the kerb drainage units may be tolerated, more preferably a 3% difference and even more preferably a 1% difference. O 6

Typically, the transverse cross-section of an internal surface of a kerb drainage means is substantially rectangular or square. As discussed above, the trough of the kerb drainage unit defines the part of the kerb drainage unit in which a fluid collects and through which the fluid may flow. Thus, the trough represents only a portion of the kerb drainage unit. Typically, the trough has a transverse internal cross-section that comprises at least one straight portion, and particularly that is substantially rectangular or square (especially substantially rectangular).

In particular, the transverse cross-section of the internal surface of the channel is not round or oval. The transverse cross-section of the internal surface of the channel may comprise at least one straight portion, for example to match a transverse internal cross-section of a trough when this also comprises at least one straight portion. The transverse cross-section of the internal surface of the channel may particularly be substantially rectangular or square (especially substantially rectangular), for example to match a transverse internal cross-section of a trough when this also is substantially rectangular or square (especially substantially rectangular). This is advantageous because it matches the transverse internal cross-sectional shape of the channel to the transverse internal cross-sectional shape of the troughs of the kerb drainage units. This is believed to provide a substantially constant fluid flow rate through the drainage kerb assembly of the present invention.

In this case, the present invention replaces the traditionally used cylindrical pipes as the component through which a fluid, such as water, flows between kerb drainage units by a substantially rectangular or square channel so as to match the transverse internal cross-section of the troughs of the kerb drainage units. Furthermore, the channel of the present invention can readily and conveniently be used with standard kerb drainage units without the need for any modification of the units.

As the skilled person would appreciate, the substantially rectangular or square transverse cross-section of the internal surface of the kerb drainage units, troughs and/or channel need not be a geometrically exact rectangle or square. The cross-section may for example include one or more sloped or curved sections along a dimension of the substantially rectangular or square shape. The transverse cross-section of the internal surface of the channel should match or mirror the transverse internal cross-section of each of the troughs, for example when the transverse internal cross-section of each of the troughs is substantially rectangular or square. * 7

The transverse cross-section of the internal surface of the channel preferably is substantially uniform along the entire length of the channel. In other words, the internal surface of the channel (including the expansion joint) defines a transverse cross-section that is substantially the same along the whole length of the channel (for example a substantially constant rectangular or square cross-section). This is advantageous because it helps to maintain the desired constant fluid flow rate through the kerb drainage assembly in use.

The transverse internal cross-section of each of the troughs preferably is substantially uniform along its entire length. Additionally, the transverse internal cross-section of both of the troughs is typically substantially the same along their entire lengths. As discussed above, this constant transverse internal cross-section is advantageous because it helps to maintain the desired constant fluid flow rate through the kerb drainage assembly in use.

The channel of the drainage kerb assembly may comprise a first channel section and a second channel section, wherein the first channel section and the second channel section are joined by the expansion joint at their facing end surfaces.

In other words, the first and second channels may be arranged end-on-end and joined by the expansion joint at their facing end surfaces.

The first and second channel sections may be comprised of any suitable material, particularly a material capable of withstanding the necessary loads and forces in use of the kerb drainage assembly. Suitable materials from which the channel sections may be formed include metals such as steel (for example stainless or galvanised steel) or iron (for example ductile or cast iron) and plastics materials.

Typically, the first and channel sections are formed using standard techniques, such as welding, casting and/or moulding (for example depending on the particular material(s) being used).

The expansion joint should be sized and shaped so as to maintain the desired constant fluid flow rate through the channel and also accommodates movement of the constructional material surrounding the kerb drainage assembly, as discussed above. Additionally, the expansion joint should be provided in the channel in a sealing engagement so as to prevent ingress and egress of a fluid, such as water, at the joint. In other words, the expansion joint should provide an air-and/or water-tight joint. * 8

The expansion joint may comprise a connector means adapted for connecting (preferably for releasably connecting) the expansion joint to the end surfaces of the first and second channel sections. Any suitable connector means may be provided and should maintain the ability of the expansion joint to accommodate the movement of surrounding constructional material. In particular, the connector means may be adapted to provide a water-tight connection to the end surfaces of the first and second channel sections. Thus, the connector means preferably provides a water-tight, releasable connection to the end surfaces of the adjacent channel sections.

A suitable connector means may comprise a projecting rim or flange on the expansion joint for cooperation and fixing to a cooperating projecting rim or flange on the end of the appropriate the channel section. The flanges may be fastened together by any suitable fastening means, for example by any suitable mechanical fastening means such as a nut and bolt arrangement. A water-tight connection may be provided by including a suitable gasket at the interface between the connector means and the end surfaces of the first and second channel sections, for example between flanges as described.

Typically, the components of the kerb drainage assembly provide a fiSt or level configuration along its length relative to the surface in which it is laid, i.e. along its length when laid along a surface. However, the kerb drainage assembly may alternatively provide a non- linear configuration, such as a fully or partially sloped configuration, if desired. A non-linear configuration may be preferred when the expansion joint is of a deep section and/or the angle of the expansion joint up and over the drainage units must remain shallow.

The channel may comprise any suitable expansion joint. The particular expansion joint selected may depend on the location at which it is intended to lay the drainage kerb assembly and the amount and type of movement to be accommodated by the expansion joint. Typically the channel comprises only one expansion joint, but two or more expansion joints may be provided if required.

The expansion joint may comprise an elastomeric insert, for example which elastomeric insert may join facing end surfaces of adjacent first and second channel sections. The elastomeric insert should be suitably sized and shaped so as to provide the desired transverse internal cross-section as discussed above and maintain the desired constant fluid flow rate through the channel. The elastomeric O 9 insert also functions to accommodate the movement of the constructional material surrounding the kerb drainage assembly.

The elastomeric insert may be corrugated or pleated, for example the walls of the elastomenc insert may be fully or partially corrugated or pleated. The corrugated or pleated walls and/or the elasticity of the elastomeric insert enable a sufficient degree of movement of the expansion joint to accommodate the movement of the surrounding constructional material without distortion of the channel or connected kerb drainage units, in use of the kerb drainage assembly.

The elastomeric insert comprises a suitable elastomeric material, such as an elastomeric material selected from one or more of neoprene and rubber. In particular, the elastomeric material may comprise ethylene-propylene-diene monomer (EPDM) rubber or nitrile rubber, such rubbers having high chemical resistance to salts and fuels.

The expansion joint may comprise a sleeve interposed between the first and second channel sections, i.e. so as to join the facing end surfaces of the first and second channel sections. For example, such a sleeve may be sized and arranged to fit over the external walls of the first and second channel sections, for example as an external sleeve. Advantageously, the sleeve may be sized and arranged to fit inside the internal walls of the first and second channel sections, for example as an internal sleeve. The external or internal sleeve arrangement suitably provides a close-fitting or snug fit with the first and second channel sections for example by ensuring that the transverse internal cross-sections of the first and second channel sections and of the sleeve are substantially the same.

The sleeve may be interposed between the first and second channel sections in a sealing engagement. For example, the sleeve may comprise a first seal located on an external wall for sealing engagement with an internal wall of the first channel section and a second seal on an external wall for sealing engagement with an internal wall of a second channel section. The sleeve may comprise a first seal located on an internal wall for sealing engagement with an external wall of the first channel section and a second seal on an internal wall for sealing engagement with an external wall of a second channel section.

The channel may comprise a connector means adapted for connecting (preferably for releasably connecting) the channel to each of the troughs. Any suitable connector means may be provided and preferably should be adapted to provide a water-tight connection to the end surfaces of each of the troughs. Thus, the connector means preferably provides a water-tight, releasable connection to the end surfaces of each of the troughs. A suitable connector means may comprise any suitable mechanical connector means, such as a nut and bolt arrangement. A water-tight connection may be provided by including a suitable gasket at the interface between the connector means and the end surfaces of the troughs.

The drainage kerb assembly may comprise a cover plate for the channel.

The cover plate continues the profile of the kerb drainage assembly across the channel and covers, or protects, the channel in use. The cover plate may be permanently or releasably fixed in the kerb drainage assembly. Preferably, the cover plate is releasably fixed to the kerb drainage units so as to allow access to the channel, for example to allow maintenance and replacement of the channel if necessary.

The cover plate may be fixed to the kerb drainage units so as to accommodate the movement of the surrounding constructional material. For example, the kerb drainage units may each comprise a support ledge or shelf projecting from an end of the unit, which support ledge or shelf includes one or more threaded slots therein. The cover plate may comprise a corresponding number of slots (optionally threaded slots) which are positioned so as to locate over the slots of the support ledge or shelf when the cover plate in located over the channel. Bolts or pegs, especially threaded bolts or pegs, may then be pushed through the slots of both the cover plate and the support ledge or shelf of the kerb drainage units and screwed into place, such that the cover plate is free to move on the slots and accommodate movement of the surrounding constructional material.

The cover plate may comprise a non-skid formation on its upper surface in use.

Preferably, one or both of the kerb drainage units comprises one or more openings and/or slots for entry of a fluid into the trough, especially one or more openings in the cap of the kerb drainage units. Typically any such openings and/or slots are located in a side wall of the kerb drainage unit. Especially any such * 11 openings are located in a side wall of the cap, the openings being located and arranged as described above.

According to another aspect of the present invention, there is provided a channel for use in the drainage kerb assembly as described above, wherein the channel comprises an expansion joint and is adapted to connect the troughs of two kerb drainage units so as to provide a fluid flow path therebetween, and wherein the channel has an internal surface with a transverse cross-section aligned with and matching the transverse internal cross-section of each of the troughs.

Components of the channel are as described above in relation to the kerb drainage assembly. For example, the channel may comprise a first channel section and a second channel section wherein the first channel section and the second channel section are joined by the expansion joint at their facing end surfaces. The channel may comprise any suitable expansion joint, such as an expansion joint as described above.

According to another aspect of the present invention, there is provided a method of providing a kerb drainage assembly, the method comprising the steps of: (i) providing a channel as described above; and (ii) aligning and connecting the trough of each of the two kerb drainage units with the channel, so as to provide a fluid flow path therebetween.

Preferably in step (ii) of the above method, the channel has an internal surface with a transverse cross-section aligned with and matching the transverse internal cross-section of each of the troughs at the open end connected to the channel.

According to another aspect of the present invention, there is provided a method of providing drainage in a kerb assembly, the method comprising the steps of: (i) providing a kerb drainage assembly as described above; and (ii) laying the kerb drainage assembly at a desired location.

According to another aspect of the present invention, there is provided the use of a kerb drainage assembly as described above for providing drainage at a desired location. * 12

According to another aspect of the present invention, there is provided the use of a channel as described above for connecting the troughs of two kerb drainage units.

The drainage kerb assembly of the present invention may be laid at any suitable location, for example along the edge of a road, highway or path. The kerb drainage assembly is particularly suitable for laying at a location where movement of the surrounding constructional material is likely to occur, for example on a bridge or elevated highway.

The present invention will now be described by way of example only and with reference to the accompanying sc hematic drawings, wherein: Figure 1 shows a perspective view of a standard kerb drainage unit as known in the art.

Figure 2 shows a perspective view of a drainage kerb assembly of the present invention.

Figure 3 shows a perspective view of a channel of the present invention Figure 4 shows a transverse cross-section of a channel of the present invention Figure 5 shows a perspective view of a drainage kerb assembly (including a cover plate) of the present invention.

Figure 6 shows a perspective view of a drainage kerb assembly of the present invention.

Figures 7 and 8 show a perspective view of a channel of the present invention.

Figure 9 shows a perspective view of a drainage kerb assembly of the present invention. * 13

Figure 1 shows a standard kerb drainage unit (1) as known in the art. The kerb drainage unit (1)is of a generally rectangular shape and comprises a base wall (2), a top wall (3) and two side walls (4, 5). The kerb drainage unit (1) comprises a trough (6) defined by the base wall (2) and lower portions of the two side walls (4, 5).

The trough (6) has a transverse internal cross-section that is substantially rectangular (as shown by the dashed lines in Figure 1). The kerb drainage unit (1) also comprises a cap (7) defined by the top wall (3) and upper portions of the two side walls (4, 5), such that the cap (7) provides a lid for the trough (6). In the kerb drainage unit (1) shown in Figure 1 the trough (6) and cap (7) are integrally formed.

Typically, in use of the kerb drainage unit (1), the trough (6) is located underneath the surface of the ground in which the unit is laid and the cap (7) is located above the surface of the ground in which the unit is laid.

The side wall (5) of the cap (7) of the kerb drainage unit (1) comprises a plurality of openings (8) through which a surface fluid, such as surface water, may drain into the kerb drainage unit (1) and collect in the trough (6). The fluid that collects in the trough (6) then flows along the length of the trough (6) and departs via.

a suitably located outlet (not shown). The side wall (5) of the trough (6) of the kerb drainage unit (1) also comprises a plurality of slots (9) through which a sub-surface fluid, such as waLer, may drain into the kerb drainage unit (1) and collect in the trough (6). As shown in Figure 1, the slots (9) in the trough (6) are of a smaller size than the openings (8) in the cap (7). This ensures that the fluid flows along the length of the trough (6) and out of the outlet, instead of flowing out of the slots (9) and into the surrounding area. In Figure 1, the openings (8) and slots (9) are arranged along the entire length of the side wall (5) and are equally spaced, but this is not essential.

Whilst the kerb drainage unit (1) shown in Figure 1 includes a plurality of openings (8) and a plurality of slots (9), as discussed above the openings (8) and/or slots (9) are not essential.

Figure 2 shows a drainage kerb assembly (10) according to the present invention. The drainage kerb assembly comprises two kerb drainage units (1), each comprising a trough (6) and a cap (7) as described in relation to Figure 1. The drainage kerb assembly (10) further comprises a channel (11) connecting the kerb drainage units (1) and the channel (11) comprises an expansion joint (12). The channel (11) connects the kerb drainage units (1) to each other end-on-end in a fluid-tight manner. * 14

The internal surface of the channel (11) shown in Figure 2 has a transverse cross-section that matches the transverse internal cross-section of the trough (6) of each of the kerb drainage units (1). Thus, the internal surface of the channel (11) has a transverse cross-section that is essentially rectangular.

In the drainage kerb assembly (1) shown in Figure 2, the expansion joint (12) is located between a first channel section (13) and a second channel section (14) and the expansion joint (12) compnses an elastomeric insert (15) having corrugated walls.

Figure 3 shows the channel (11) of the drainage kerb assembly (1) shown in Figure 2 in more detail. The channel (11)comprises a first channel section (13) and a second channel section (14), and an expansion joint (12) which comprises an elastomeric insert (15) having corrugated walls. The expansion joint (12) is located between facing end surfaces of the adjacent first and second channel sections (13, 14) and joins the first channel section (13)to the second channel section (14). As shown in Figures 2 and 3, the channel (11) is hollow so provide a path through which a fluid may flow. The corrugated elastomeric insert (15) accommodates movement of the surrounding area in which it is located in use, without any distortion of the channel (11).

The internal surface of the channel (11) shown in Figure 3 has a transverse cross-section that is essentially rectangular, i.e. so as to match the transverse internal cross-section of the trough (6) of each of the kerb drainage units (1). The transverse cross-sections of the internal surfaces of the first and second channel sections (13, 14) and the expansion joint (12) are all essentially the same size and shape along the entire length of the channel, i.e. to provide a constant size and shape of path through which the fluid may flow.

The elastomeric insert (15) comprises a flange on each end (not shown), wherein one such flange attaches to a flange (16) on an end of the first channel section (13) and one such flange attaches to a flange (17) on an end of the second channel section (14). In this way, the elastomeric insert (15) is securely located between the facing end surfaces of the adjacent first and second channel sections (13, 14). A gasket (not shown) may be provided between the flanges to provide a water-tight attachment. * 15

Figure 4 shows the transverse cross-section of drainage kerb assembly (1) shown in Figure 2 at a location along the length of the first channel section (13).

Figure 4 shows the trough (6) of the first channel section (13) and the cap (7) providing a lid for the trough (6). In the drainage kerb assembly (1) shown in Figure 4, the trough (6) and cap (7) are integrally formed. The dashed lines in Figure 4 represent the transverse cross-section of the trough (6).

Figure 5 shows the drainage kerb assembly shown in Figure 2, further comprising a cover plate (18) positioned over the channel (not shown) connecting the kerb drainage units (1). The cover plate (18) is sized and arranged so as to continue the profile of the kerb drainage units and the kerb in general across the hollow channel (11). The cover plate (18) is fixed to the cap (7) of each of the kerb drainage units (1) but the fixing means is not shown in Figure 5.

Figure 6 shows another drainage kerb assembly (20) according to the present invention. The drainage kerb assembly comprises two kerb drainage units (1), each comprising a trough (6) and a cap (7) as described in relation to Figure 1. The drainage kerb assembly (20) further comprises a channel (21) connecting the kerb drainage units (1) and the channel (21) comprises an expansion joint (22). The channei (21) connects the kerb drainage units (1)to each other end-on-end in a fluid-tight manner.

The internal surface of the channel (21) shown in Figure 6 has a transverse cross-section that matches the transverse internal cross-section of the trough (6) of each of the kerb drainage units (1). Thus, the internal surface of the channel (21) has a transverse cross-section that is essentially rectangular.

In the drainage kerb assembly (20) shown in Figure 6, the expansion joint (22) is located between a first channel section (23) and a second channel section (24) and the expansion joint (22) comprises a sleeve (25) interposed between the first and second channel sections (23, 24).

The assembly shown in Figure 6 may further comprise a cover plate for the channel (20) so as to maintain the profile of the kerb, as discussed above, although this is not shown in Figure 6. * 16

Figure 7 shows the channel (21) of the drainage kerb assembly (20) shown in Figure 6 in more detail. The channel (21) comprises a first channel section (23), a second channel section (24), and an expansion joint (22) which comprises a sleeve (25) interposed between the first and second channel sections (23, 24) so as to connect those sections end-on-end. The sleeve (25) further comprises a seal (not shown in Figure 7) for providing a water-tight seal at its joint with the first and second channel sections (23, 24).

Figure 8 shows the expansion joint (22) of the channel (21) shown in Figure 7 in more detail. The dashed lines in Figure 8 represent the adjacent first and second channel sections (23, 24) when joined to the expansion joint (22).

As also shown in Figure 7, the expansion joint (22) shown in Figure 8 comprises a sleeve (25) interposed between the first and second channel sections (23, 24). The sleeve (25) further comprises two seals (26, 27) comprising a band of rubber extending around the external surface of the sleeve (25). The seals (26, 27) engage with the inner surfaces of the first and second channel sections (23, 24) in which the expansion joint (22) is placed. As shown in Figure 8, one seal (26) sits in the space between external surface of the sleeve (25) and the internal surface of the first channel section (23) in the overlapping region provided when the sleeve (25) sits inside the first channel section (23). The other seal (27) sits in the space between external surface of the sleeve (25) and the internal surface of the second channel section (24) in the overlapping region provided when the sleeve (25) sits inside the second channel section (24). The seals (26, 27) provide a close fitting, water-tight seal where the expansion joint (22) joins the first and second channel sections (23, 24).

In the arrangement of the channel (21) shown in Figures 7 and 8, the expansion joint (22) is securely located between the facing end surfaces of the adjacent first and second channel sections (23, 24) by means of the sleeve (25) and the rubber bands or seals (26, 27). As well as providing a water-tight joint, the rubber bands or seals (26, 27) further accommodate movement of the surrounding area in which the channel (21) is located in use without distortion.

The drainage kerb assemblies shown in Figures 1 to 8 above all have a linear configuration. However, the present invention is not limited to drainage kerb assemblies of such a linear configuration. An example of alternative configuration of O 17 the drainage kerb assemblies of the present invention is shown in Figure 9. Figure 9 shows a drainage kerb assembly (30) comprising first and second channel sections (31, 32) and an expansion joint (33) (wherein the expansion joint (33) comprises an elastomeric insert substantially as described above in relation to Figures 1 to 4), but wherein the channel sections (31, 32) provide a sloped configuration. The first and second channel sections (31, 32) are each sloped and are joined at the peak of the slope by the expansion joint (33).

In use of the drainage kerb assembly of the present invention (which drainage kerb assembly may take any of the forms described above) the channel is first assembled by joining first and second channel sections by means of the expansion joint. The channel is then located between suitable kerb drainage units, the channel being sized so as to ensure that the transverse cross-section of its internal surface matches the transverse internal cross-section of the trough of the kerb drainage units to provide a drainage kerb assembly. The drainage kerb assembly may then be fitted at any desired location. * 18

Claims

Claims 1. A drainage kerb assembly comprising: (i) two kerb drainage units, each kerb drainage unit comprising a trough having open ends and a cap; and (ii) a channel comprising an expansion joint, wherein the channel is adapted to connect the troughs of the two kerb drainage units so as to provide a fluid flow path therebetween, and wherein the channel has an internal surface with a transverse cross-section aligned with and matching the transverse internal cross-section of each of the troughs.
2. A drainage kerb assembly according to claim 1, wherein the transverse cross-section of the internal surface of the channel is aligned with and matches the transverse internal cross-section of each of the troughs at the open end connected to the channel.
3. A drainage kerb assembly according to claim 1 or 2, wherein the transverse cross-section of the internal surface of the channel comprises at least one straight portion.
4. A drainage kerb assembly according to any one or more of the preceding claims, wherein the transverse cross-section of the internal surface of the channel is substantially rectangular or square.
5. A drainage kerb assembly according to any one or more of the preceding claims, wherein the transverse cross-section of the internal surface of the channel is substantially uniform along its entire length.
6. A drainage kerb assembly according to any one or more of the preceding claims, wherein the transverse internal cross-section of each of the troughs is substantially uniform along its entire length.
7. A drainage kerb assembly according to any one or more of the preceding claims, wherein the channel comprises a first channel section and a second channel section and wherein the first channel section and the second channel section are joined by the expansion joint at their facing end surfaces. * 19
8. A drainage kerb assembly according to claim 7, wherein the expansion joint comprises a connector means adapted for releasably connecting the expansion joint to the end surfaces of the first and second channel sections.
9. A drainage kerb assembly according to claim 8, wherein the connector means is adapted to provide a water-tight connection to the end surfaces of the first and second channel sections.
10. A drainage kerb assembly according to any one or more of the preceding claims, wherein the expansion joint comprises an elastomeric insert.
11. A drainage kerb assembly according to claim 10, wherein the elastomeric insert is corrugated.
12. A drainage kerb assembly according to claim 10 or 11, wherein the elastomeric insert comprises an elastomeric material selected from one or more of neoprene and rubber.
13. A drainage kerb assembly according to claim 7, wherein the expansion joint comprises a sleeve interposed between the first and second channel sections.
14. A drainage kerb assembly according to claim 13, wherein the sleeve is interposed between the first and second channel sections in a sealing engagement.
15. A drainage kerb assembly according to claim 14, wherein the sleeve comprises a first seal located on an external wall for sealing engagement with an internal wall of the first channel section and a second seal on an external wall for sealing engagement with an internal wall of a second channel section.
16. A drainage kerb assembly according to claim 14, wherein the sleeve comprises a first seal located on an internal wall for sealing engagement with an external wall of the first channel section and a second seal on an internal wall for sealing engagement with an external wall of a second channel section.
17. A drainage kerb assembly according to any one or more of the preceding claims, wherein the channel comprises a connector means adapted for releasably connecting the channel to each of the troughs. O 20
18. A drainage kerb assembly according to any one or more of the preceding claims, further comprising a cover plate for the channel.
19. A drainage kerb assembly according to any one or more of the preceding claims, wherein the kerb drainage units each comprise one or more openings for entry of a fluid into the trough.
20. A channel for use in the drainage kerb assembly according to any one or more of the preceding claims, wherein the channel comprises an expansion joint and is adapted to connect the troughs of two kerb drainage units so as to provide a fluid flow path therebetween, and wherein the channel has an internal surface with a transverse cross-section aligned with and matching the transverse internal cross-section of each of the troughs.
21. A channel according to claim 20, wherein the channel comprises a first channel section and a second channel section and wherein the first channel section and the second channel section are joined by the expansion joint at their facing end surfaces.
22. A method of providing a kerb drainage assembly, the method comprising the steps of: (I) providing a channel according to claim 20 or 21; and (ii) aligning and connecting the trough of each of the two kerb drainage units with the channel, so as to provide a fluid flow path therebetween.
23. A method of providing drainage in a kerb assembly, the method comprising the steps of: (i) providing a kerb drainage assembly according to any one or more of claims 1 to 19; and (ii) laying the kerb drainage assembly at a desired location.
24. The use of a kerb drainage assembly according to any one or more of claims ito 19 for providing drainage at a desired location.
25. The use of a channel according to claim 20 or 21 for connecting the troughs of two kerb drainage units. * 21
26. A drainage kerb assembly, channel, method or use generally as herein described with reference to and/or as illustrated in the accompanying drawings.