AU2004100008A4 - Lined manhole base section - Google Patents

Lined manhole base section Download PDF

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Publication number
AU2004100008A4
AU2004100008A4 AU2004100008A AU2004100008A AU2004100008A4 AU 2004100008 A4 AU2004100008 A4 AU 2004100008A4 AU 2004100008 A AU2004100008 A AU 2004100008A AU 2004100008 A AU2004100008 A AU 2004100008A AU 2004100008 A4 AU2004100008 A4 AU 2004100008A4
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AU
Australia
Prior art keywords
bowl
base
pipe
pipes
exterior
Prior art date
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Ceased
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AU2004100008A
Inventor
Shane Wormall
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BLUEPORT NOMINEES Pty Ltd
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BLUEPORT NOMINEES Pty Ltd
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Publication date
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Priority to AU2002304984A priority patent/AU2002304984A1/en
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Application granted granted Critical
Publication of AU2004100008A4 publication Critical patent/AU2004100008A4/en
Anticipated expiration legal-status Critical
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Description

AUSTRALIA
Patents Act 1990 COMPLETE SPECIFICATION INNOVATION PATENT Applicant(s): BLUEPORT NOMINEES PTY LTD A.C.N. 091 604 330 Invention Title: LINED MANHOLE BASE SECTION The following statement is a full description of this invention, including the best method of performing it known to me/us: 2 LINED MANHOLE BASE SECTION FIELD OF THE INVENTION The present invention relates to a manhole base section for connection of underground pipes.
BACKGROUND TO THE INVENTION Underground pipes, particularly those that carry sewerage often require inspection or maintenance. Access to the pipes is provided by a manhole base section that interconnects the underground pipes. The base section supports a riser that is covered by a manhole cover. This allows access to the base section for inspection or maintenance of the base section or the pipes.
Currently, manhole base sections are provided with a generally cylindrical wall surrounding a cavity into which the pipes connect. So as to enhance the flow of fluid or slurry from an inlet pipe to an outlet pipe a channel is fabricated into the base section. The channel accommodates directional flow of fluid or slurry from the incoming to the outgoing pipe. This fabrication method is labour intensive and thus expensive. Furthermore, it provides difficult working conditions for the person fabricating the channel due to the cramped space. Where the diameter of the inlet and outlet pipes exceed 300mm, the construction of the manhole base sections have been previously limited by the corrosive property of sewage passing through the pipes.
US 5303518 (Strickland) describes a plastic liner for protecting concrete manhole interior surfaces from corrosion. The manhole base section in this prior art document includes a floor and a cylindrical side wall having at least two circular holes and a top surface, the floor includes a ledge or bench and a channel or channels through the floor. The channels depicted appear to be H:\mcamp\keep\speci\P51789 LINED MANHOLE BASE SECTION INNOV.doc 3 relatively flat and also appear to be precast into the base section. This provides two main disadvantages the first of which is that the angle of channels coming into and out of the base section are fixed even though the connection of a pipe to the base section may be varied using the fitting assembly described therein. A second main disadvantage is that if a surge of fluid entered the base section it would overflow the channel and end up on the ledge of the base section, particularly if a surge came from two inlet pipes there would be an accumulation on the ledge before it could drain from the outlet pipe. The ledge of the base section is often used by a person to stand upon. If the surface of the ledge was wet or slippery it would provide a dangerous situation to the person standing thereon.
SUMMARY OF THE INVENTION The present invention was developed with a view to providing an improved manhole base section that increases the resistance to corrosive properties of sewage, and allows for an accumulation of fluid within the base section without it necessarily flowing onto a ledge which improves conditions where a person would stand to conduct maintenance or inspection of inlet and outlet pipes.
In accordance with the present invention there is provided a manhole base section for connection to underground pipes, the base section comprising: a body having a base, at least one exterior side wall, a top and an interior wall extending into the body from an opening at the top of the body to define a cavity therein, the interior side wall comprising a ledge at least partly around a bowl portion of the side wall, the bowl portion having a sloped wall so as to provide a sump, the bowl portion being lined with a corrosion resistant liner; wherein a first pipe extends from the exterior side wall into the bowl portion and a second pipe extends from the sump to the exterior side wall or the base, H:\mcamp\keep\speci\P51789 LINED MANHOLE BASE SECTION INNOV.doc 4 wherein the bowl portion has a larger cross-sectional area than the second pipe to accommodate an accumulation of fluid or slurry flowing through the sump into the second pipe.
In accordance with the present invention there is provided a manhole base section for connection to underground pipes, the base section comprising: a body having a base, at least one exterior side wall, a top and an interior wall extending into the body from an opening at the top of the body to define a cavity therein, the interior side wall comprising a ledge at least partly around a bowl portion of the side wall, the bowl portion having a drainage point, the bowl portion being lined with a corrosion resistant liner; wherein a first pipe extends from the exterior side wall into the bowl portion and a second pipe extends from the drainage point to the exterior side wall or the base, wherein the bowl portion has a larger cross-sectional area than the second pipe to accommodate an accumulation of fluid or slurry flowing through the drainage point into the second pipe.
Preferably further pipes extend from the exterior side wall into the bowl portion, whereby fluid or slurry from the further pipes can accumulate in the bowl portion and pass through the sump into the second pipe.
Preferably further pipes extend from the exterior side wall into the bowl portion, whereby fluid or slurry from the further pipes can accumulate in the bowl portion and pass through the sump into the second pipe.
Preferably the second pipe extends from the sump below a level at which the bowl portion meets the ledge.
H:\mcamp\keep\speci\P51789 LINED MANHOLE BASE SECTION INNOV.doc 5 Preferably the position at which the first pipe opens into the bowl portion is at a relatively higher height to the position where the second pipe opens into the sump portion.
In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word comprise" or variations such as comprises" or comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS In order to provide a better understanding of the nature of the present invention, a preferred embodiment of the manhole base section will now be described in detail, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a schematic side view representation of the base section of a preferred embodiment of the manhole base section in accordance with the present invention; Figure 2 is a top view of the base section of Figure 1; Figure 3 is a side view of a base section of another preferred embodiment of the manhole base section in accordance with the present invention; and Figure 4 is a top view of the base section of Figure 3.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Referring to Figure 1, there is shown a manhole base section 10 that includes a pre-formed corrosion resistant liner 50, and concrete body 12. The body 12 has a top 14, a base 16 and a sidewall 18. The concrete body 12 has a generally frustoconical external shape with the curved surface forming the sidewall 18. The base 16 of the body 12 is larger in area than the top 14. The top 14 of the H:\mcamp\keep\speci\P51789 LINED MANHOLE BASE SECTION INNOV.doc 6 body 12 is provided with an opening 20 leading into a cavity 22 that extends into the body 12. The cavity 22 is divided into a recess portion 24 and a bowl portion 26. A lower part of the bowl portion 26 forms a sump.
A sidewall 28 and ledge 30 boarder the recess portion 24.
The sidewall 28 is directed substantially downwardly from the top 14 and slopes slightly inwardly until it meets the ledge 30. The ledge 30 is substantially horizontal, although it slopes slightly downwardly towards the bowl portion 26.
The bowl portion 26 is preferably an inverted dome shape.
The bowl portion 26 is defined by a bowl wall 32. The bowl wall 32 is sloped so that the bowl portion 26 is provided with a single drainage or collection point 34.
The periphery of the top 14 forms a lip 36 within which there is provided a riser recess 38. The riser recess 38 extends inwardly from the lip 36 to a riser ledge 40. The riser ledge 40 is provided so that a riser (not shown) may sit on the ledge 40 within the riser recess 38, so as to provide passage to the manhole to allow access to the base section for inspection or maintenance.
The pre-formed liner 50 of this embodiment is formed of polyvinyl chloride plastics (PVC). It is received through the opening 20 of the concrete body and marries with the internal surfaces of the concrete body 12. The liner therefore has a cavity 22' divided into a recess portion 24' and a bowl portion 26'. A lower part of the bowl portion 26' forms a sump. A sidewall 28' and ledge 30' of the liner 50 boarder the recess portion 24'. The ledge is substantially horizontal, although it slopes slightly downwardly towards the bowl portion 26'. The bowl portion 26' is preferably an inverted dome shape. The bowl portion 26' is defined by a bowl wall 32'. The bowl wall 32' is H:\mcamp\keep\speci\P51789 LINED MANHOLE BASE SECTION INNOV.doc 7 sloped so that the bowl portion 26' is provided with a single drainage or collection point 34'. Liquid within the bowl moves, under the force of gravity, down the sloping bowl walls 32' to a drainage point 34'.
A first pipe 42 is shown extending from the sidewall 18 to the bowl portion 26 of the concrete body and 26' of the PVC liner. The pipe is PVC welded to the liner. The pipe is also in fluid communication with the inside of the bowl portion 26'. The first pipe 42 is slightly downwardly sloping so as to encourage, under the influence of gravity, the flow of fluid or slurry within the pipe into the bowl section 26' of the PVC liner. The first pipe 42 opens into the bowl portion 26' at opening 44. The opening 44 is higher relative to the drainage point 34, so that fluid or slurry from the first pipe 42 flows down the bowl wall 32' of the PVC liner to the drainage point 34'. A second pipe 46 also extends from the sidewall 18 into the bowl portion 26 of the concrete body and 26' of the PVC liner. The second pipe 46 has a downward slope leading from the bowl portion of the PVC liner 34' so that fluid or slurry is encouraged to flow, under the influence of gravity, from the bowl portion 26' out through the second pipe 46. The second pipe is also welded to the liner. The second pipe 46 opens into the bowl portion at opening 48.
The opening 48 is positioned at or adjacent to the drainage point 34' of the PVC liner so that fluid or slurry flowing down the bowl wall 32' of the PVC liner to the drainage point 34' will then flow on from the drainage point 34' into the second pipe 46. The opening 48 of the second pipe is thus lower than the opening 44 of the first pipe. It is envisaged that an alternative may be to provide the opening 46 at the base of the drainage point so that the second pipe 42 in beneath the bowl portion 26'. However, this embodiment is less preferred as it may require a bend in the pipe 46.
H:\mcamp\keep\speci\P51789 LINED MANHOLE BASE SECTION INNOV.doc 8 Referring to Figure 2, it can be seen that the pipes are disposed relative to one another at an angle 0 which is approximately 1800. The position of the pipes relative to one another may be provided at any desired angle. Common angles 0 will be 300, 450, 600, 900, 1350 and 1800.
Additional pipes may be added leading from the sidewall 18 through the bowl portion 26 of the concrete body and into the bowl portion 26' of the PVC liner.
If additional pipes are added, providing inlets to the bowl portion 26' of the PVC liner, they should always be provided at a height greater than the opening 48 of the second pipe so that liquid or slurry always flows from the inlet pipe/s toward the drainage point 34' and then out through the second pipe 46.
Holes may be bored through the body to provide a passage for the pipes. If the pipes are required to be at a particular non-standard angle they may either be precast into the concrete or holes for the pipes may be precast or the holes may be cored so that the pipes may be inserted. Otherwise set angled base sections may be prefabricated and stored ready for later use.
Referring to Figures 3 and 4, this alternative form of base section has the bowl portion divided into a semihemispherical inlet portion 54 and a funnel shaped outlet portion 56. The inlet portion 54 is defined by the hemispherical wall 32 that is sloped to provide collection point 34. The collection point 34 is at an interface with the outlet portion 56. The outlet portion 56 is defined by opposite walls that are disposed at an acute angle to one another and a curved channel shaped bottom wall as can be seen most clearly in Figure 4. The fluid at the drain point 34 is channelled between the opposed walls 52, through the channel shaped bottom wall to outlet pipe 46. The shape of H:\mcamp\keep\speci\P51789 LINED MANHOLE BASE SECTION INNOV.doc 9 the bowl portion 46' of the liner 50 is of a corresponding shape to the bowl shaped portion 26. That is, the bowl portion 26' of the liner includes a hemispherical inlet portion 54' and a funnel shaped outlet portion 56'. The wall of the hemispherical inlet portion is defined by the hemispherical wall 34' and the shape of the outlet portion 56' is defined by opposed walls 52' that are disposed at an acute angle to one another and a curved channel shaped bottom wall. The liner may also be provided with an outlet tube section 58' for connection to the outlet pipe 46. The tube section 58' connects the outlet of the outlet portion 56' to the outlet pipe 46.
The method of manufacture of the manhole base section is as follows. A corrosion resistant liner 50 is vacuum molded from PVC. Another suitable technique made be used to manufacture the liner 50. The liner is then placed on a mold shaped to cast the base section 10. At least the bowl portion 26' of the liner will coincide with the bowl portion 26' of the cast base section. The liner is generally in an inverted orientation on the mold for ease of casting. Thus the mold will have an upwardly projecting dome shape that will form the bowl portion in the cast bowl portion. The mold is then filled with concrete and the concrete allowed to cure. The cast base section is removed from the mold, with the liner bonded to the inside of the cast base section.
To assist in bonding projections may be provided in the liner so that the liner is mechanically connected to the cast concrete.
It is sometimes desirable to have one or more pipes precast into the base section. In this instance, the pipes may be coupled to the bowl shaped portion of the liner by PVC welding prior to filling the mold with concrete. Once attached, the concrete is then poured into the mold. A H:\mcamp\keep\speci\P51789 LINED MANHOLE BASE SECTION INNOV.doc 10 hole may be cut in the liner to allow fluid communication between the inside of the bowl shaped portion and the pipe either before casting, or after casting, on-site.
The method of use and operation of the present invention will now be described with reference to the accompanying drawings.
The manhole base section is positioned within the ground.
The inlet pipes are connected as the first and additional pipes, and the second pipe 46 is provided as an outlet pipe.
The outlet pipe may be larger in diameter than the first pipe and additional pipes so as to allow adequate flow. A riser is inserted into the riser recess and rests on the riser ledge 40. The riser is generally then covered with a manhole that allows access through the riser to the base section for inspection or maintenance of the base section or pipes leading to and from the bowl portion. Soils are back filled around the base section.
In use, fluid or slurry enters the bowl portion through the first or further pipes, the slurry then flows down the bowl wall 32 to the drainage point 34, whereupon it then flows into the second pipe opening 48 and out through the second pipe 46.
The skilled addressee will realise that the present invention provides the following advantages: pipes may be provided at any desired angle relative to one another; labour intensive channel fabrication is not required as the shape of the bowl portion results in fluid or slurry flowing from the inlet pipes to the outlet pipes.
A surge of liquid or slurry into the bowl portion can be accommodated due to its relatively larger cross-sectional area than the second pipe.
H:\mcamp\keep\speci\P51789 LINED MANHOLE BASE SECTION INNOV.doc 11 Modifications and variations can be made to the present invention without departing from the basic inventive concept. Such modifications may include forming the body of the base section of a material other than concrete; the number of inlet or indeed outlet pipes may be more than that shown in the drawings; the angle of the inlet pipe to the outlet pipe may be other than that shown in the drawings; the outlet pipe may extend downwardly from the drainage portion as a sink and may exit the body through the base; the shape of the base section may be other than the frustoconical shape, the shape of the bowl section may be other than a dome shape, such as an elliptical shape and/or the riser recess may be replaced with a riser projection if the riser has a female receptor, rather than a male projection.
Such modifications and variations are intended to be within the scope of the present invention, the nature of which is to be determined from the foregoing description and the appended claims.
H:\mcamp\keep\speci\P51789 LINED MANHOLE BASE SECTION INNOV.doc

Claims (5)

1. A manhole base section for connection to underground pipes, the base section comprising: a body having a base, at least one exterior side wall, a top and an interior wall extending into the body from an opening at the top of the body to define a cavity therein, the interior side wall comprising a ledge at least partly around a bowl portion of the side wall, the bowl portion having a sloped wall so as to provide a sump, the bowl portion being lined with a corrosion resistant liner; wherein a first pipe extends from the exterior side wall into the bowl portion and a second pipe extends from the sump to the exterior side wall or the base, wherein the bowl portion has a larger cross-sectional area than the second pipe to accommodate an accumulation of fluid or slurry flowing through the sump into the second pipe.
2. A manhole base section for connection to underground pipes, the base section comprising: a body having a base, at least one exterior side wall, a top and an interior wall extending into the body from an opening at the top of the body to define a cavity therein, the interior side wall comprising a ledge at least partly around a bowl portion of the side wall, the bowl portion having a drainage point, the bowl portion being lined with a corrosion resistant liner; wherein a first pipe extends from the exterior side wall into the bowl portion and a second pipe extends from the drainage point to the exterior side wall or the base, wherein the bowl portion has a larger cross-sectional area than the second pipe to accommodate an accumulation of fluid or slurry flowing through the drainage point into the second pipe.
3. A manhole base section as defined in either claim 1 or H:\mcamp\keep\speci\P51789 LINED MANHOLE BASE SECTION INNOV.doc 13 2, wherein further pipes extend from the exterior side wall into the bowl portion, whereby fluid or slurry from the further pipes can accumulate in the bowl portion and pass through the sump into the second pipe.
4. A manhole base section as defined in any one of claims 1 to 3, wherein the second pipe extends from the sump below a level at which the bowl portion meets the ledge.
5. A manhole base section as defined in any one of claims 1 to 4, wherein the position at which the first pipe opens into the bowl portion is at a relatively higher height to the position where the second pipe opens into the sump portion. Dated this 8th day of January 2004 BLUPORT NOMINEES PTY LTD By their Patent Attorneys GRIFFITH HACK Fellows Institute of Patent and Trade Mark Attorneys of Australia H:\mcamp\keep\speci\P51789 LINED MANHOLE BASE SECTION INNOV.doc
AU2004100008A 2001-06-11 2004-01-08 Lined manhole base section Ceased AU2004100008A4 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AUPR5562 2001-06-11
AU2002304984A AU2002304984A1 (en) 2001-06-11 2002-06-11 Lined manhole base section

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