EP0744359B1 - Improvements in and relating to access chambers - Google Patents
Improvements in and relating to access chambers Download PDFInfo
- Publication number
- EP0744359B1 EP0744359B1 EP96201367A EP96201367A EP0744359B1 EP 0744359 B1 EP0744359 B1 EP 0744359B1 EP 96201367 A EP96201367 A EP 96201367A EP 96201367 A EP96201367 A EP 96201367A EP 0744359 B1 EP0744359 B1 EP 0744359B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- access chamber
- rod
- corbel unit
- corbel
- tool
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/02—Manhole shafts or other inspection chambers; Snow-filling openings; accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/10—Manholes; Inspection openings; Covers therefor
- B65D90/105—Manholes; Inspection openings; Covers therefor for underground containers
Definitions
- the present invention relates to a tool joining together in sealing engagement the upper edge of the access chamber above an underground storage chamber and the loser edge of a corbel unit, the latter extending from the access hole frame down to the upper edge of the access chamber.
- a common problem associated with the installation of access chambers for underground storage tanks is that associated with ground movements which can occur. If the corbel unit is rigidly attached to the access chamber wall, ground movements can cause the whole structure to be pushed upwards and/or buckle.
- a temporary fixing tool for temporarily securing a corbel unit to an associated access chamber, the tool comprising a support mounted for longitudinal movement along a rod, one end of said rod being adapted to be supported by the upper edge of the access chamber, and the tool including clamp means which can be loosened to allow the support to slide along the rod and tightened to clamp the support rigidly onto the rod.
- the corbel unit may include flexible sealing strip having an upper edge for securing circumferentially to an upper portion of a containment manhole and a lower edge for securing circumferentially to an access chamber of said manhole, wherein upper portion of the manhole comprises a corbel unit and the sealing strip has, between said two edges, a middle section which is shaped into a "bellows" configuration whereby any movement between the access chamber and the corbel unit can be accommodated by means of said shaped middle section without breaking the sealing engagement.
- the "bellows" shaped middle section absorbs the relative movement of the two structures.
- the fixing tool enables a method of joining and sealing a corbel unit to an access chamber during underground installation thereof, the method comprising temporarily fixing the relative positions of the lower edge of the corbel unit and the upper edge of the access chamber wall at the desired level, securing the first edge of a flexible sealing strip circumferentially to the corbel unit and securing the second edge of the strip circumferentially to the access chamber wall, said sealing strip having a "bellows" shaped middle section whereby any movement between the access chamber and the corbel unit can be accommodated by means of said shaped middle section without breaking the sealing engagement.
- the apparatus includes a protective housing, one end of which is joined to the corbel unit, and the other end of which overhangs the seal.
- the access chamber is first fitted to the top of the storage tank, and then the corbel unit, which is of a fixed length, is fitted to the top of the access chamber at such a level that, when the access hole frame is seated on top of the corbel unit, the frame is flush with ground level.
- the temporary fixing is achieved by means of the fixing tool of the invention.
- the tool comprises a small block having a bore running vertically therethrough, and a cylindrical rod which passes through the bore and is hooked over at the top.
- the block also has a threaded bore extending laterally, for receiving a tightening bolt.
- the hooked end of the rod is slipped over the edge of the access chamber wall, and the lower edge of the corbel unit is seated on top of the block.
- the block, and the corbel unit seated thereon, is then slid up or down the rod, until the desired level is achieved, i.e. when the level of the uppermost edge of the corbel unit is such that when the frame is seated thereon, the upper surface of the frame is flush with the ground, whereupon the bolts are tightened, clamping the block to the rod.
- a further advantage of the applicant's device is that it may be used to assist in removing any unnecessary height from the access chamber. If necessary, a line can be marked around the interior of the corbel unit while the temporary fixing means is in place, and the excess height of the access chamber would be sawn off to approximately 25mm above this line, having first removed the temporary fixing means and the corbel unit. Then, the corbel unit would again be temporarily fixed within the access chamber, as described previously, adjusting the temporary fixing means as appropriate.
- the edges of the sealing strip are then clamped as described, and the temporary fixing tools, of which several may be used, are removed only after back-filling to ground level with concrete, leaving the corbel unit attached and sealed to the access chamber wall in a flexible manner which is capable of absorbing changes in relative position of the two structures, by means of the specially shaped middle region of the seal.
- an underground storage tank (not shown) has an access chamber 10, only the upper wall 12 of which is shown, and a corbel unit 14 which spans the gap between the top of the access chamber 10 and the access hole frame 16.
- Water may enter through the access hole when the cover 17 is removed, and condensation water can also form due to lower night-time temperatures, particularly on the underneath of the cover. Any such water drips onto domed lid 18, which covers the entry to the access hole, to run down the lid and into a U shaped channel 20 which is bolted at intervals to the corbel unit 14, by means of bolt 24, swan neck type clamp 24a and threaded insert 24b.
- mastic may be used to enhance the seal.
- An alternative is to bond the channel 20 to the interior of the corbel unit 14, using, for example, an acrylic adhesive.
- the base of the channel is open at one or more points, to allow connection via strap 23 to duct 22 which removes the water to either a separate collection bottle (not shown) or the exterior of the access chamber.
- a flexible sealing strip 30 which runs around the entire perimeter of the corbel unit, the upper edge being strapped to the corbel unit via strap 32 and the lower edge being strapped to the access chamber wall via strap 34.
- the middle region of the seal is shaped as illustrated, which provides a "bellows" effect to absorb relative movements of the corbel unit and the access chamber.
- FIG. 2 A device for allowing accurate placement of this sealing strip during installation is shown in figures 2, 3 and 4.
- the correct level of the corbel unit lower edge 15 relative to the access chamber upper edge 13 must be achieved, such as to allow the seal to be fitted, as well as having the frame 16, when seated on the corbel unit, flush with ground level.
- the device 41 of figures 2, 3 and 4 achieves this and comprises a block 42 with a central bore running vertically therethrough, through which is received a cylindrical rod 40.
- the rod 40 is hooked at its uppermost end 40a, and this end is hooked over the upper edge of the access chamber wall 13.
- the block 42 also includes an internally threaded bore 42a running laterally, which receives a tightening bolt 43, the arrangement being such that tightening the bolt within the lateral bore clamps the block 42 onto the rod 40 in any desired position along the rod.
- the strip is protected by fitting a housing 36 to the corbel unit, as illustrated in the drawings.
- the devices 41 would be used (for example five or six), spaced around the perimeter of the access chamber, to collectively form what is essentially an adjustable height ledge for "hanging" the corbel unit within the access chamber at the desired height.
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- Glass Compositions (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
- Sewage (AREA)
- Seal Device For Vehicle (AREA)
Abstract
Description
- The present invention relates to a tool joining together in sealing engagement the upper edge of the access chamber above an underground storage chamber and the loser edge of a corbel unit, the latter extending from the access hole frame down to the upper edge of the access chamber.
- A common problem associated with the installation of access chambers for underground storage tanks is that associated with ground movements which can occur. If the corbel unit is rigidly attached to the access chamber wall, ground movements can cause the whole structure to be pushed upwards and/or buckle.
- US patent specification no. 4,763,806 describes an expansion joint which is folded over on itself and connects the manhole sump portion, itself rigidly connected to a rise pipe, to the upper rim which forms the top of the manhole.
- It is the aim of the present invention to provide a fixing tool to aid joining the corbel unit to the access chamber wall in such a manner as to eliminate the aforementioned difficulties.
- According to the present invention there is provided a temporary fixing tool for temporarily securing a corbel unit to an associated access chamber, the tool comprising a support mounted for longitudinal movement along a rod, one end of said rod being adapted to be supported by the upper edge of the access chamber, and the tool including clamp means which can be loosened to allow the support to slide along the rod and tightened to clamp the support rigidly onto the rod.
- The corbel unit may include flexible sealing strip having an upper edge for securing circumferentially to an upper portion of a containment manhole and a lower edge for securing circumferentially to an access chamber of said manhole, wherein upper portion of the manhole comprises a corbel unit and the sealing strip has, between said two edges, a middle section which is shaped into a "bellows" configuration whereby any movement between the access chamber and the corbel unit can be accommodated by means of said shaped middle section without breaking the sealing engagement.
- The "bellows" shaped middle section absorbs the relative movement of the two structures.
- The fixing tool enables a method of joining and sealing a corbel unit to an access chamber during underground installation thereof, the method comprising temporarily fixing the relative positions of the lower edge of the corbel unit and the upper edge of the access chamber wall at the desired level, securing the first edge of a flexible sealing strip circumferentially to the corbel unit and securing the second edge of the strip circumferentially to the access chamber wall, said sealing strip having a "bellows" shaped middle section whereby any movement between the access chamber and the corbel unit can be accommodated by means of said shaped middle section without breaking the sealing engagement.
- Preferably, the apparatus includes a protective housing, one end of which is joined to the corbel unit, and the other end of which overhangs the seal.
- During the installation, the access chamber is first fitted to the top of the storage tank, and then the corbel unit, which is of a fixed length, is fitted to the top of the access chamber at such a level that, when the access hole frame is seated on top of the corbel unit, the frame is flush with ground level.
- The temporary fixing is achieved by means of the fixing tool of the invention.
- Preferably, the tool comprises a small block having a bore running vertically therethrough, and a cylindrical rod which passes through the bore and is hooked over at the top. The block also has a threaded bore extending laterally, for receiving a tightening bolt.
- To use this device, the hooked end of the rod is slipped over the edge of the access chamber wall, and the lower edge of the corbel unit is seated on top of the block. The block, and the corbel unit seated thereon, is then slid up or down the rod, until the desired level is achieved, i.e. when the level of the uppermost edge of the corbel unit is such that when the frame is seated thereon, the upper surface of the frame is flush with the ground, whereupon the bolts are tightened, clamping the block to the rod.
- A further advantage of the applicant's device is that it may be used to assist in removing any unnecessary height from the access chamber. If necessary, a line can be marked around the interior of the corbel unit while the temporary fixing means is in place, and the excess height of the access chamber would be sawn off to approximately 25mm above this line, having first removed the temporary fixing means and the corbel unit. Then, the corbel unit would again be temporarily fixed within the access chamber, as described previously, adjusting the temporary fixing means as appropriate.
- The edges of the sealing strip are then clamped as described, and the temporary fixing tools, of which several may be used, are removed only after back-filling to ground level with concrete, leaving the corbel unit attached and sealed to the access chamber wall in a flexible manner which is capable of absorbing changes in relative position of the two structures, by means of the specially shaped middle region of the seal.
- Embodiments of the present invention will now be described, by way of example only, with reference tot he accompanying drawings, in which;
- Figure 1 illustrates in cross section the access hole cover, frame, corbel unit and access chamber, including water collection means and sealing strip; and
- Figures 2, 3 and 4 illustrate the use of the temporary fixing tool of the invention to enable the sealing strip illustrated tin figure 1 to be attached in the desired manner.
-
- Referring to the drawings, an underground storage tank (not shown) has an
access chamber 10, only theupper wall 12 of which is shown, and acorbel unit 14 which spans the gap between the top of theaccess chamber 10 and theaccess hole frame 16. - Water may enter through the access hole when the
cover 17 is removed, and condensation water can also form due to lower night-time temperatures, particularly on the underneath of the cover. Any such water drips ontodomed lid 18, which covers the entry to the access hole, to run down the lid and into a U shapedchannel 20 which is bolted at intervals to thecorbel unit 14, by means ofbolt 24, swanneck type clamp 24a and threaded insert 24b. In addition, mastic may be used to enhance the seal. - An alternative is to bond the
channel 20 to the interior of thecorbel unit 14, using, for example, an acrylic adhesive. -
Small ridges 14a in the interior surface of the corbel unit cause any condensation droplets running down the surface to drip into the channel below. - The base of the channel is open at one or more points, to allow connection via
strap 23 toduct 22 which removes the water to either a separate collection bottle (not shown) or the exterior of the access chamber. - Also illustrated in figure 1 is a
flexible sealing strip 30, which runs around the entire perimeter of the corbel unit, the upper edge being strapped to the corbel unit viastrap 32 and the lower edge being strapped to the access chamber wall viastrap 34. The middle region of the seal is shaped as illustrated, which provides a "bellows" effect to absorb relative movements of the corbel unit and the access chamber. - A device for allowing accurate placement of this sealing strip during installation is shown in figures 2, 3 and 4.
- Before the
sealing strip 30 can be secured in place, the correct level of the corbel unitlower edge 15 relative to the access chamberupper edge 13 must be achieved, such as to allow the seal to be fitted, as well as having theframe 16, when seated on the corbel unit, flush with ground level. - The
device 41 of figures 2, 3 and 4 achieves this and comprises ablock 42 with a central bore running vertically therethrough, through which is received acylindrical rod 40. Therod 40 is hooked at itsuppermost end 40a, and this end is hooked over the upper edge of theaccess chamber wall 13. Theblock 42 also includes an internally threadedbore 42a running laterally, which receives atightening bolt 43, the arrangement being such that tightening the bolt within the lateral bore clamps theblock 42 onto therod 40 in any desired position along the rod. - After hooking the
rod 40 over thechamber wall 13, theedge 15 of the corbel unit is allowed to rest on the block, and with thebolt 43 loosened, theblock 42 is slid up or down along therod 40 until theframe 16 is brought flush with ground level. Thebolt 43 is then tightened to hold the corbel unit in place, whilst thesealing strip 30 is strapped into place as described above. If necessary, any excess height of the access chamber can be removed, using the temporary fixing as a guide as described previously. Figure 2 shows the arrangement before the excess height on the access chamber is sawn off, and figure 4 illustrates the arrangement afterwards, the position of theblock 42 on therod 40 having been re-adjusted. - Once fitted, the strip is protected by fitting a
housing 36 to the corbel unit, as illustrated in the drawings. - The excavation is then back-filled with concrete up to ground level, the
bolt 43 is loosened slightly, therod 40 is rotated through 90 degrees, and thedevice 41 can then be slipped downwards and removed from the access chamber. - Typically, several of the
devices 41 would be used (for example five or six), spaced around the perimeter of the access chamber, to collectively form what is essentially an adjustable height ledge for "hanging" the corbel unit within the access chamber at the desired height.
Claims (3)
- A temporary fixing tool (41) for temporarily securing a corbel unit to an associated access chamber, the tool comprising a support (42) mounted for longitudinal movement along a rod (40), one end of said rod being adapted to be supported by the upper edge (13) of the access chamber, and the tool including clamp means (42a, 43) which can be loosened to allow the support to slide along the rod and tightened to clamp the support rigidly onto the rod.
- A tool according to claim 1 and comprising a small block (42) having a bore running vertically therethrough, and a cylindrical rod (40) which passes through the bore and is hooked over at the top.
- A tool according to claim 1 or claim 2 and including a threaded bore (42a) extending laterally, for receiving a tightening bolt (43).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9510482 | 1995-05-24 | ||
GBGB9510482.4A GB9510482D0 (en) | 1995-05-24 | 1995-05-24 | Improvements in and relating to access chambers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0744359A1 EP0744359A1 (en) | 1996-11-27 |
EP0744359B1 true EP0744359B1 (en) | 2001-12-19 |
Family
ID=10774944
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96201367A Expired - Lifetime EP0744359B1 (en) | 1995-05-24 | 1996-05-21 | Improvements in and relating to access chambers |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0744359B1 (en) |
AT (1) | ATE211106T1 (en) |
DE (1) | DE69618076D1 (en) |
GB (1) | GB9510482D0 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9705424D0 (en) * | 1997-03-15 | 1997-04-30 | Fibresec Holding Ltd | Dual purpose structural lid for use in access chamber |
FR2789098B1 (en) * | 1999-02-03 | 2001-04-06 | Cahors App Elec | LOOK WITH A WATERPROOF WATERPROOF HOUSING WITH INTEGRATED VENT AND QUICK OPENING |
ES2169659B1 (en) * | 1999-05-05 | 2003-11-01 | Manuf D App Electr De Cahors S | REGISTRATION THAT INCLUDES A BOX UNDERSTANDED, WITH INTEGRATED BREATHER AND QUICK OPENING. |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4278115A (en) * | 1979-08-06 | 1981-07-14 | Briles Wallace E | Device for capturing and retaining spilt fluids |
US4763806A (en) * | 1987-02-24 | 1988-08-16 | Emco Wheaton, Inc. | Containment manhole |
US4793387A (en) * | 1987-09-08 | 1988-12-27 | Enterprise Brass Works, Inc. | Overfill spillage protection device |
US5114271A (en) * | 1990-10-03 | 1992-05-19 | Dover Corporation | Spill containment devices |
-
1995
- 1995-05-24 GB GBGB9510482.4A patent/GB9510482D0/en active Pending
-
1996
- 1996-05-21 AT AT96201367T patent/ATE211106T1/en not_active IP Right Cessation
- 1996-05-21 EP EP96201367A patent/EP0744359B1/en not_active Expired - Lifetime
- 1996-05-21 DE DE69618076T patent/DE69618076D1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
GB9510482D0 (en) | 1995-07-19 |
DE69618076D1 (en) | 2002-01-31 |
EP0744359A1 (en) | 1996-11-27 |
ATE211106T1 (en) | 2002-01-15 |
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