GB2449641A - A seal arrangement for a surface access assembly - Google Patents
A seal arrangement for a surface access assembly Download PDFInfo
- Publication number
- GB2449641A GB2449641A GB0710175A GB0710175A GB2449641A GB 2449641 A GB2449641 A GB 2449641A GB 0710175 A GB0710175 A GB 0710175A GB 0710175 A GB0710175 A GB 0710175A GB 2449641 A GB2449641 A GB 2449641A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sealing member
- access assembly
- surface access
- sealing
- cover member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
Abstract
A surface access assembly (10) comprises a frame (12) defining an opening (18), a cover member (14) mountable on the frame in the opening and a sealing member (26) for providing a seal between the frame (12) and the cover member (14). The sealing member (26) includes a first part (30) and a second part (28), the second part (28) being relatively more deformable in use than the first part (30).
Description
SEALING MEMBERS
The present invention relates to sealing members, particularly but not exclusively sealing members for surface access assemblies.
Conventionally, surface access assemblies include a frame defining an opening and a cover, mountable on the frame in the opening, which permits access through the opening to underground services. Such surface access assemblies are typically installed at ground level in the ground. In certain situations, it is required to prevent any seepage of surface water through the opening into the underground services, and in such situations it is known to provide a seal between the cover member or members and the frame.
Typically, the seal could be resiliently deformable in the form of a gasket formed of rubber or a mastic layer. However, in heavier trafficking applications the cover or covers must be mounted to the frame via a non rock mounting, which in the case of a three point mounting precludes the use of a resiliently deformable seal between the cover and the frame. In these applications, one solution is to provide another cover, mounted on the frame below the load bearing, upper cover, the seal being provided between the lower cover and the frame.
In practice, it has been found difficult to provide an adequate seal between the lower cover and the frame because of the manufacturing tolerances of the lower cover and the frame and typically it has therefore been necessary to provide fasteners such as bolts to tighten the lower cover against the frame to ensure an adequate seal. The provision of such fasteners is relatively expensive, time consuming, and can lead to unsatisfactory installations where the fasteners are lost, or operators to not tighten the fasteners correctly.
According to one aspect of the present invention, there is provided a sealing member for a providing a seal between a frame and a cover member of a surface access assembly, the sealing member including a first part and a second part, the second part being relatively more deformable in use than the first part.
Possibly the sealing member is arranged so that the deformation is resilient.
Possibly in use the sealing member is arranged so that the deformation is caused by a compressive force, and may be caused by only a compressive force Possibly, the cross sectional area through which the compressive force is transmitted is greater in the first part than the second part.
Possibly, first part is in the form of a body, and the second part may be in the form of a projection. The projection may project outwardly from the body, and may project outwardly and downwardly in use from the body.
Possibly, the sealing member is in the form of an endless loop.
Possibly, the sealing member has a substantially constant cross-sectional shape.
Possibly, the projection is formed of a deformable material, and may be formed of a resiliently deformable material.
Possibly, the body is formed of a deformable material, and may be formed of a resiliently deformable material. Possibly, the projection is formed integrally with the body.
Possibly, the resiliently deformable material is a rubber or plastics material, and may have a Shore hardness of between 50 and 60.
Possibly, the sealing member includes mounting means to permit mounting of the sealing member to the cover member in use.
Possibly, the mounting means include a recess, which may be defined by the body, and in which part of the cover member is receivable in use.
Possibly, the body is in the form of a C shape in cross-section.
Possibly, the mounting means include retaining means, for retaining the sealing member in a mounted condition to the cover member. Possibly the retaining means include gripping members, which may resiliently grip the cover member in use, and may grip around a feature of the cover member in use.
Possibly, the projection has a height to width aspect ratio of between 1:1 and 1.5:1, the height being the distance the projection projects outwardly from the body. Possibly, the projection projects a distance of between 4 and 8 millimetres from the body.
According to a second aspect of the present invention, there is provided a surface access assembly, the assembly comprising a frame defining an opening, a cover member mountable on the frame in the opening and a sealing member for providing a seal between the frame and the cover member, the sealing member including a first part and a second part, the second part being relatively more deformable in use than the first part.
Possibly, the sealing member is as described above in any of the
preceding statements.
Possibly, the frame includes a mounting face on which the sealing member is mounted in use. Possibly the mounting face forms an endless loop. Possibly, the mounting face has a maximum surface flatness tolerance of +/-1.5mm, and may be formed by a machining process.
Possibly, the cover member has a mounting edge to which the sealing member is mounted in use, and which may be substantially continuous around the cover member. Possibly, the mounting edge forms a gripping feature, which may be in the form of an enlarged flange.
Possibly, the cover member includes a seating face, on which the cover member seats in use. Possibly the seating face corresponds with the mounting face.
Possibly, in use the second part is positioned between the seating face and the mounting face. Possibly the second part is positioned directly beneath the seating face in use.
Possibly the seating face is formed on the flange.
Possibly, in use the surface access assembly is arranged so that the weight of the cover member alone compresses the sealing member to provide sealing between the cover member and the frame.
Possibly, in use the cover member is a non load bearing cover member. Possibly, the surface access assembly includes a load bearing cover member, which may be mounted to the frame above the non load bearing cover member.
According to a third aspect of the present invention, there is provided a method of sealing a surface access assembly, the assembly comprising a frame defining an opening, a cover member mountable on the frame in the opening and a sealing member, the sealing member including a first part and a second part, the second part being relatively more deformable in use than the first part, the method including the step of positioning the sealing member between the cover member and frame.
Possibly, the sealing member is as described above in any of the preceding paragraphs. Possibly, the surface access assembly is as described above in any of the preceding paragraphs.
An embodiment of the present invention will now be described, by way of example only, and with reference to the accompanying drawings, in which:-Fig.1 is an exploded perspective view from the side and above of a surface access assembly; Fig.2 is a perspectwe view of a sealing member; Fig.3 is an enlarged perspective detail view of a cross-section of the sealing member of Fig.2; Fig.4 is a cross-section of the surface access assembly of Fig. 1; Fig 5 is a detail view at an enlarged scale of part of Fig.4, as indicated in Fig.4 by the box labelled V. Referring to Fig.1, a surface access assembly 10 includes a frame 12 defining an opening 18, a pair of substantially similar load bearing upper cover members 14, a non load bearing sealing cover member 20 and a sealing member 26.
The frame 12 includes corner mountings 16 on which the upper cover members 14 are mountable in an assembled condition. Each of the upper cover members is substantially triangular in plan and the corner mountings 16 provide three point non rock mounting for each of the upper cover members 14.
The frame 12 includes a lower mounting projection 22 which extends inwardly towards the opening 18, and extends continuously around the opening 18. The lower mounting projection 22 includes an in use upwardly directed mounting face 24 which in one example could be a machined face.
The frame 12, upper cover members 14 and sealing cover member 20 could be formed by casting, and could be formed of, for example, ductile iron.
Referring to Figs. 2 and 3, the sealing member 26 is in the form of an endless loop, having a substantially constant cross-section. Fig.3 shows the cross-section in enlarged detail. The sealing member 26 includes a first part in the form of a body 30 which is C shaped in cross-section, the body 30 including an end wall 40, an upper wall 42 and a lower wall 44 extending from upper and lower ends of the end wall 40 respectively to form the C shape, and defining mounting means in the form of a recess 32. The sealing member 26 includes retaining means in the form of a pair of retaining members 34 in the form of lips which extend inwardly towards each other from the free ends of the upper and lower walls 42, 44 to define a mouth 36 therebetween.
The sealing member 26 includes a second part in the form of a projection 28 which extends outwardly downwardly from the lower wall 44. In one example, the height 46 of the projection, which is the distance that the projection 28 extends outwardly from the lower wall 44 is between 4 and 8 mm, and optimally is approximately 6 mm. In another example, the ratio of the height 46 to the width 48 could be between 1.51 and 1:1, and optimally could be approximately 1.2:1.
The sealing member 26 is formed integrally, of a resiliently deformable material such as rubber or a plastics material, having a Shore hardness of between 50 and 60. Material of this hardness has been found in practice to provide a good combination of deformability with resistance to damage in use.
The sealing cover member 20 is substantially planar and includes a mounting edge, the mounting edge including a gripping feature in the form of a flange 28 which is enlarged in depth relative to the rest of the sealing cover member 20, and extends continuously around the perimeter thereof. The flange 38 includes an in use downwardly facing flange seating face 50.
Figs.4 and 5 show the surface access assembly 10 in the assembled condition. In use, the assembly 10 is assembled as follows. The frame 12 is installed, for example, in position in the ground on a bed of settable material such as mortar. The sealing member 26 is mounted to the sealing cover member 20, the flange 38 being received within the recess 32, so that the sealing member 26 extends continuously around the perimeter edge of the sealing cover member 20. The sealing member 26 could be arranged so that when being fitted to the seating cover member 20, the sealing member 26 must be deformed. There could be two deformations necessary: the first, to stretch the sealing member 26 to fit over the sealing cover member 20, and the second, to open the lips 34 to receive the flange 38. In the assembled condition, the sealing member 26 in one example remains in a deformed condition, the resilient property of the sealing member 26 providing retaining means to retain the sealing member in the assembled condition. The enlarged flange 38 is completely received within the recess 32, the enlarged flange 38 and the retaining lips 34 interlocking, the lips 34 gripping around the flange 38.
The sealing cover member 20 and sealing member 26 are then mounted within the frame 12 so that the seating face 50 corresponds in spaced relationship with the mounting face 24, and the projection 28 locates on the mounting face 24. In the assembled condition, the projection 28 is positioned between the flange seating face 50 and the mounting face 24 directly beneath the flange seating face 50, so that the projection 28 is only subject to compressive forces applied by the weight of the sealing cover member 20.
With the sealing cover member 20 in position, the load bearing upper cover members 14 can then be mounted to the corner mountings 16.
The width 48, and hence the cross sectional plan area of the projection 24 is less than the width and cross sectional plan area of the lower wall 44, and hence the projection 24 is relatively more deformable than the lower wall 44.
It has been realised by the applicant that a major problem in sealing surface access assemblies is that of relatively large surface flatness tolerances which result from the casting process. Typically the combined surface flatness tolerance of two faces such as the flange seating face 50 and the mounting face 24 has been found to be between 0 and 6mm.
Conventionally, this order of casting tolerance has made sealing without the use of fasteners such as bolts or the use of machined surfaces impractical and/or relatively expensive. The applicant has realised that by providing a machined mounting face 24, the surface flatness tolerance can be reduced to between 0 and 3 mm. Even with this reduced surface flatness tolerance, conventional sealing members such as 0 nngs or gaskets have not been found to provide the necessary level of compression to provide adequate sealing without the use of fasteners such as bolts.
However, the sealing member of the present invention has been found to provide adequate sealing, the relatively greater deformability of the projection 28 in pure compression providing sealing without being easily damaged in use, It has been found that by use of the sealing member 26 of the present invention, it is not necessary to machine the flange seating face 50, although optionally a machined flange seating face 50 could be provided. -.
In one -exámpIeçthe.. seal frovided by the self weight of the sealing cover member 20 is not a 100% seal, but has been found to be 90 -95% effective, and is thus acceptable for applications where, for example, occasional relatively short-lived flooding is experienced.
The sealing cover member 20 is advantageously as light as possible, since this cover member 20 is non load bearing, and merely has to provide a seal. In one example of the assembly of the present invention, it has been found that a sealing cover member 30 of dimension 600 mm x 600 mm could be of the order of around 30 kg to enable an adequate seal to be formed by compression of the projection 28 by the weight of the sealing cover member 20 alone.
The assembly of the present invention provides a number of advantages. The assembly can be relatively easily manufactured using known manufacturing techniques. Assembly on site is easy for unskilled operators, with no fasteners to lose or install incorrectly. The assembly is economical to provide in comparison with conventional assemblies.
Various other modifications could be made without departing from the scope of the invention. The surface access assembly 10 and the parts thereof could be of any suitable shape and size, and could be formed of any suitable materials. The sealing member 26 and the projection 28 could be of any suitable size and shape. For example, the projection 28 could be in the form of a concertina. The sealing member 26 including the projection 28 could be mounted to the sealing cover member 20 by any suitable means and in any suitable orientation. For example, the sealing member 26 could be in the form of a strip which is mounted to the underside of the sealing cover member 20 by bonding by, for example, adhesive. In another example, the sealing member 26 could be mounted to the frame 12, and the projection 28 could project upwardly towards the sealing cover member 20.
Whilst endeavouring in the foregoing specification to draw attention to those features of the invention believed to be of particular importance it should be understood that the Applicant claims protection in respect of any patentable feature or combination of features hereinbefore referred to and/or shown in the drawings whether or not particular emphasis has been placed thereon.
Claims (53)
1. A seating member for providing a seal between a frame and a cover member of a surface access assembly, the seating member including a first part and a second part, the second part being relatively more deformable in use than the first part.
2. A sealing member according to claim 1, in which the sealing member is arranged so that the deformation is resilient.
3. A sealing member according to claims 1 or 2, in which in use the sealing member is arranged so that the deformation is caused by a compressive force.
* ,. 15
4. A sealing member according to any of the preceding claims, in which in use the sealing member is arranged so that the deformation is caused by only a compressive force. * ** * * * *** *
*.
5. A sealing member according to claims 3 or 4, in which the cross sectional area through which the compressive force is transmitted is greater in the first part than the second part.
6. A sealing member according to any of the preceding claims, in which the first part is in the form of a body.
7. A sealing member according to any of the preceding claims, in which the second part is in the form of a projection.
8. A sealing member according to claim 7 when dependent on claim 6, in which the projection projects outwardly from the body.
9. A sealing member according to claim 8, in which the projection projects outwardly and downwardly in use from the body.
10. A sealing member according to any of the preceding claims, in which the sealing member is in the form of an endless loop.
11. A sealing member according to any of the preceding claims, in which the sealing member has a substantially constant cross-sectional shape.
12. A sealing member according to claim 7 or any claim dependent thereon, in which the projection is formed of a deformable material.
13. A sealing member according to claim 13, in which the projection is formed of a resiliently deformable material.
14. A sealing member according to claim 6 or any claim dependent S... thereon, in which the body is formed of a deformable material. * .* * * * S*S *
15. A sealing member according to claim 14, in which the body is formed of a resiliently deformable material.
*:*
16. A sealing member according to claim 7 or any claim dependent thereon, when dependent on claim 6, in which the projection is formed integrally with the body.
17. A sealing member according to claims 13 or 15 or any claim dependent thereon, in which the resiliently deformable material is a rubber or plastics matenal.
18. A sealing member according to claim 17, in which the resiliently deformable material has a Shore hardness of between 50 and 60.
19. A sealing member according to any of the preceding claims, in which the sealing member includes mounting means to permit mounting of the sealing member to the cover member in use.
20. A sealing member according to claim 19, in which the mounting means include a recess, which is defined by the body, and in which part of the cover member is receivable in use.
21. A sealing member according to claim 20, in which the body is in the form of a C shape in cross-section.
22. A sealing member according to any of claims 19 to 21, in which the mounting means include retaining means, for retaining the sealing member in a mounted condition to the cover member. * **
23. A sealing member according to claim 22, in which the retaining means include gripping members. * S. * S S S** S
24. A sealing member according to claim 23, in which the retaining means resiliently grip the cover member in use.
*..
25. A sealing member according to claim 24, in which the retaining means grip around a feature of the cover member in use.
26. A sealing member according to claim 8 or any claim dependent thereon, in which the projection has a height to width aspect ratio of between 1:1 and 1.5:1, the height being the distance the projection projects outwardly from the body.
27. A sealing member according to claim 8 or any claim dependent thereon, in which the projection projects a distance of between 4 and 8 millimetres from the body.
28. A surface access assembly, the assembly comprising a frame defining an opening, a cover member mountable on the frame in the opening and a sealing member for providing a seal between the frame and the cover member, the sealing member including a first part and a second part, the second part being relatively more deformable in use than the first part.
29. A surface access assembly according to claim 28, in which the sealing member is according to any of claims 1 to 27.
30. A surface access assembly according to claims 28 or 29, in which the frame includes a mounting face on which the sealing member is mounted in use.
* 15
31. A surface access assembly according to claim 30, in which the mounting face forms an endless loop. **** * * * S..
:
32. A surface access assembly according to claims 30 or 31, in which the mounting face has a maximum surface flatness tolerance of +/-1.5mm.
33. A surface access assembly according to claim 32, in which the *:*. mounting face is formed by a machining process.
34. A surface access assembly according to any of claims 28 to 33, in which the cover member has a mounting edge to which the sealing member is mounted in use.
35.A surface across assembly according to claim 34, in which the mounting member is substantially continuous around the cover member.
36. A surface access assembly according to claims 34 or 35, in which the mounting edge forms a gripping feature.
37. A surface access assembly according to claim 36, in which the gripping feature is in the form of an enlarged flange.
38. A surface access assembly according to any of claims 28 to 37, in which the cover member includes a seating face, on which the cover member seats in use.
39. A surface access assembly according to claim 38 when dependent on any of claims 30 to 33, in which the seating face corresponds with the mounting face.
* 15
40. A surface access assembly according to claim 39, in which in use the second part is positioned between the seating face and the mounting face. * ** * S S S.. S
41.A surface access assembly according to claim 40, in which the second part is positioned directly beneath the seating face in use.
*..
42. A surface access assembly according to any of claims 38 to 41 when dependent on claim 37, in which the seating face is formed on the flange.
43. A surface access assembly according to any of claims 28 to 42, in which in use the surface access assembly is arranged so that the weight of the cover member alone compresses the sealing member to provide sealing between the cover member and the frame.
44. A surface access assembly according to any of claims 28 to 43, in which in use the cover member is a non load bearing cover member.
45. A surface access assembly according to any of claims 28 to 44, in which the surface access assembly includes a load bearing cover member.
46. A surface access assembly according to claim 45 when dependent on claim 44, in which the load bearing cover member is mounted to the frame above the non load bearing cover member.
47. A method of sealing a surface access assembly, the assembly comprising a frame defining an opening, a cover member mountable on the frame in the opening and a sealing member, the sealing member including a first part and a second part, the second part being relatively more deformable in use than the first part, the method including the step of positioning the sealing member between the cover * memberand frame s S * S S.-.
48. A method of sealing a surface access assembly according to claim 47, in which the sealing member is according to any of claims 1 to 27.
49. A method of sealing a surface access assembly according to claims 47 or 48, in which the surface access assembly is according to any of claims 28 to 46.
50. A sealing member substantially as hereinbefore described and with reference to the accompanying drawings.
51. A surface access assembly substantially as hereinbefore described and with reference to the accompanying drawings.
52. A method of sealing a surface access assembly substantially as hereinbefore described and with reference to the accompanying drawings.
53. Any novel subject matter or combination including novel subject matter disclosed herein, whether or not within the scope of or relating to the same invention as any of the preceding claims. * SS * 6 6 * 6* *6 * * C * 006 * 6* * I * 0sI I
I S..
I I. * *
* *... I. 6 6 I S * IS
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0710175A GB2449641B (en) | 2007-05-26 | 2007-05-26 | Sealing members |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0710175A GB2449641B (en) | 2007-05-26 | 2007-05-26 | Sealing members |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0710175D0 GB0710175D0 (en) | 2007-07-04 |
| GB2449641A true GB2449641A (en) | 2008-12-03 |
| GB2449641B GB2449641B (en) | 2012-02-08 |
Family
ID=38265451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0710175A Active GB2449641B (en) | 2007-05-26 | 2007-05-26 | Sealing members |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2449641B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2530174A (en) * | 2014-08-29 | 2016-03-16 | Wrekin Holdings Ltd | Ground surface access assembly arrangements |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4772154A (en) * | 1986-09-05 | 1988-09-20 | Pont-A-Mousson S.A. | Sealing gasket for a roadway manhole |
| US4834574A (en) * | 1987-07-23 | 1989-05-30 | Bowman Harold M | Utility cover extension |
| FR2661437A1 (en) * | 1990-04-26 | 1991-10-31 | Pont A Mousson | Manhole |
| EP0580993A1 (en) * | 1992-07-29 | 1994-02-02 | REHAU AG + Co | Manhole cover for inspection shafts |
| KR100463579B1 (en) * | 2004-09-08 | 2004-12-29 | 주식회사 정원주철 | Tight and fixing type manhole cover using packing |
| FR2893641A1 (en) * | 2005-11-23 | 2007-05-25 | Norinco Soc Par Actions Simpli | Public roads equipment e.g. carriageway manhole, has flexible damping joint integrated to inner peripheral edge of support frame so that face of another flexible damping joint is supported in sealed manner on face of former joint |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2438678B (en) * | 2006-05-31 | 2011-11-16 | Wrekin Welding & Fabrication Engineering Ltd | Surface access assemblies |
-
2007
- 2007-05-26 GB GB0710175A patent/GB2449641B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4772154A (en) * | 1986-09-05 | 1988-09-20 | Pont-A-Mousson S.A. | Sealing gasket for a roadway manhole |
| US4834574A (en) * | 1987-07-23 | 1989-05-30 | Bowman Harold M | Utility cover extension |
| FR2661437A1 (en) * | 1990-04-26 | 1991-10-31 | Pont A Mousson | Manhole |
| EP0580993A1 (en) * | 1992-07-29 | 1994-02-02 | REHAU AG + Co | Manhole cover for inspection shafts |
| KR100463579B1 (en) * | 2004-09-08 | 2004-12-29 | 주식회사 정원주철 | Tight and fixing type manhole cover using packing |
| FR2893641A1 (en) * | 2005-11-23 | 2007-05-25 | Norinco Soc Par Actions Simpli | Public roads equipment e.g. carriageway manhole, has flexible damping joint integrated to inner peripheral edge of support frame so that face of another flexible damping joint is supported in sealed manner on face of former joint |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2530174A (en) * | 2014-08-29 | 2016-03-16 | Wrekin Holdings Ltd | Ground surface access assembly arrangements |
| GB2530174B (en) * | 2014-08-29 | 2021-07-14 | Wrekin Holdings Ltd | Ground Surface Access Assembly Arrangements |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0710175D0 (en) | 2007-07-04 |
| GB2449641B (en) | 2012-02-08 |
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