Abstract: A manhole cover frame leveling clip, that attaches by a friction fit to the exterior peripheral flange of a manhole cover frame, and uses an adjustable bolt running through the clip, to manipulate the height and angle of the frame so that the frame is in the same plane or the correct elevation with the finished grade of the roadway surface.

Abstract: An adjustable manhole cover frame assembly suitable for mounting on a manhole basin upper section has an outer ring, capable of resting on the top surface of the upper section, and an inner ring engaging the outer ring by screw threads and having support for a manhole cover. The lower surface of the frame assembly has a part spherically curved surface resting on a similarly curved surface of the manhole basin upper section and which allows the orientation of the frame assembly to be adjusted. Also, the frame assembly itself may have parts with part spherical mating surfaces allowing an upper part to be adjusted for slope when the remainder of the frame assembly has been fixed.

Abstract: A superimposed drain cover is provided. The drain cover includes a tubular seat secured to the top of a cement drain, an outer ring engaged on the top of the seat having a tapered outer periphery and a cobweb surfaced cover covering on the top of the seat inside the outer ring. It is characterized that further has a plurality of cushion pieces and the spare superimposed rings which can be added between the seat and the cover so as to keep the cover even with a road surface without causing a traffic accident or traffic noise.

Abstract: A fiberglass manhole adjustment ring comprising a fiberglass pipe and a self-centering lip attached to the edge of the pipe, and a method for installing the fiberglass manhole adjustment ring in an existing fiberglass manhole. The self-centering lip can either be attached to the interior edge of the pipe to form a sleeve or to the exterior edge of the pipe to form a collar. An interior self-centering lip, or sleeve, slides into an adjoining fiberglass manhole section while an exterior self-centering lip, or collar, slides over an adjoining manhole section. The manhole adjustment ring is inserted between the cone section and barrel section of an existing fiberglass manhole to accommodate changes in elevation of the surrounding grade level. The self-centering lip may also be used on manhole sections to enable field assembly of a manhole.

Abstract: An adjustable manhole/catch basin structure includes a mounting base, adjustable tube, and protection sleeve. The mounting base includes a mounting flange and an externally threaded tube which extends upward from the mounting flange. A plurality of mortar openings are formed through the mounting flange. The protection sleeve is mounted concentric with the externally threaded tube. The adjustable tube is internally threaded such that it may be threaded on to the externally threaded tube. The inner diameter of the protection sleeve is large enough to provide clearance for the outer diameter of the adjustment tube. Three notches are preferably formed in a top of the adjustment tube to allow an adjustment tool to rotate thereof to the desired height. The adjustment tool includes a body, three arms and a torque lever.

Abstract: A road gully or inspection cover assembly comprises an outer frame having an upstanding outer wall and integrally formed support means extending inwardly of the lower regions of the outer wall over part at least of the peripheral extent of said outer wall, a first temporary inner frame for location within the outer frame, the outer frame and the first temporary inner frame co-operating to support a cover for the assembly in a first, lowermost position associated with the base course level of the road, and a second inner frame which, on removal of the first inner frame from within the outer frame, can be located within the outer frame to support the cover at a higher position associated with the wearing course level of the road.

Abstract: A locking ground hole cover is disclosed comprising a cover plate with a scissor-type apparatus suspended therefrom which apparatus can be actuated from above the cover plate. The apparatus allows for the locking of a hole by pulling the cover plate down into a sealed locked position with the hole mouth. Variations on the device are disclosed.

Abstract: The invention concerns a catch basin installation system and method wherein a catch basin is situated below ground and has a neck extending substantially vertically upward through the ground to provide access to subterranean sewage or drain lines. During installation, an adjustable collar is situated around the neck of the basin at substantially ground level or some other predetermined or desired level. The portion of the basin neck extending above the tin adjustable collar is removed by using the adjustable collar as a guide. The system and method enable a user to quickly set the catch basin so that its top edge is at the desired or predetermined level (such as ground level) so that, for example, when a grate is situated on an end of the vertically-extending neck, the grate is situated at substantially ground level.

Abstract: Adjustment risers for use in a manhole or catch basin, between a lower support structure, for example, a concrete riser, and an upper frame assembly, adjacent a surface in which the hole is formed, have a molded body and typically are annular; one or more ribs extend outwardly from a first sealing face and a corresponding one or more grooves are formed in an opposed second sealing face, each groove being in opposed relationship with a rib, whereby the adjustment risers may be matingly stacked to provide a required adjustment riser height for a specified manhole or catch basin.

Abstract: An adjustable manhole cover frame suitable for mounting on a manhole basin has an outer ring, capable of resting on the top surface of the basin, and an inner ring engaging the outer ring by screw threads and having support for a manhole cover. The inner ring also has screw jacks having lower ends suitable for contacting the basin top and rotatable to lift the inner ring. The inner ring may be rotated within the outer ring to adjust the height of the manhole cover, and the screw jacks may be used both to stabilize the inner ring while the outer ring base remains close to or in contact with the top surface, and may also be used to lift both rings out of contact with the top surface when additional raising of the inner ring is required.

Abstract: Embodiments of apparatus and a method of raising a manhole ring during construction or repair of roads are shown and described. The apparatus and method include formation of a manhole collar by use of a form that rests on a manhole cone and trimming the form to have its top edge at the correct elevation and orientation to properly receive the manhole ring. After the manhole ring is received on the form, a single monolithic pour of concrete creates a concrete collar that fills and seals the vertical space between the manhole cone and ring and the manhole ring is thus secured and sealed at the proper elevation that results in the manhole ring and its cover being level with the surrounding pavement. The apparatus includes an accurate custom-trimming assembly indexed off of the pavement surface for trimming the form to the proper dimensions for the particular site.

Abstract: An adjustable sewer inlet section for collecting and directing surface water to an underground conduit of a sewer. The inlet section comprises an eccentric hollow member adapted to be adjustably rotated on the top of the underground conduit to adjust the position of a surface water receiving member relative to a reference line, even though the underground conduit has been misplaced. A non-rigid connector is provided for connecting the receiving member in flow communication with the underground conduit, while allowing relative movement of the receiving member with respect to the underground conduit. The receiving member is provided with an inwardly directed bottom wall adapted to ensure proper distribution of loads from the receiving member to the underlying ground material.

Abstract: A roadway access device such as manhole cover, a storm drain, or a utility valve box which facilitates road paving and grinding operations. The access device includes a riser assembly having an inverted frustoconical top portion that minimizes frictional engagement between the riser and the paved surface and permits repositioning in an elevated plane with no excavation necessary. There is a tapered upper portion that engages with an internally threaded extension nut with tool-engaging receptors and when the nut extension is rotated, the upper conical portion does not rotate, but displaces vertically. There is a riser member that is externally threaded and fixed in position relative to the rest of the assembly around which the extension nut rotates in order to vertically displace the access device. Additionally, there are separate removable lids constructed of high strength material which can be put in place during paving and grinding operations and easily removed when operations are complete.

Abstract: An improved lid retainer for a ground-water monitoring well of the type having a housing, a water-tight lid, and a lid fastener for fastening the lid to the housing. The lid retainer has a lid fastener receiving member which cooperates with the lid fastener, a flexible horizontal brace member and a flexible vertical brace member, each connected to the lid fastener receiving member and adapted to be contourable to the shape of the inner surface of the housing of the monitoring well and to provide support therefor. Each brace member has an attachment structure, such as an aperture, for attaching the lid retainer to the housing by suitable fasteners. Preferred fasteners include concrete anchors.

Abstract: A manhole frame assembly for supporting a member that can obstruct an access opening when the level of a construction material around the opening is raised, includes an outer frame member having a support surface and a side wall extending from the support surface. The side wall is constructed and arranged with an upper surface that is substantially flush with an original level of the construction material. An inner frame member can be received on the support surface and includes a surface for supporting a member for obstructing the access opening. The side wall includes an abutment device for preventing upward movement of the inner frame member when the original level of construction material around the outer frame member is raised. A portion of the inner frame member is movable in a direction transverse to a direction of a length of the access opening.

Abstract: A cover for underground structures has a large number of mutually independent projections of the same size and shape uniformly provided on its surface, while small protrusions of the same size and shape are formed on the upper surfaces of some or all of these projections. On top of these small protrusions are formed even smaller protrusions of the same size and shape as the topmost protrusions. Spacing between one large projection and another, between one small protrusion and another, or between one small protrusion and a projection having no small protrusion on its top is set at the optimum distance, and the size of the topmost protrusions is also designed in a shape to fit an optimum size to ensure good skid-prevention effect on tires of vehicles passing over the cover, especially in bad weather over a long period of time, no matter where the cover is installed.

Abstract: A restrainable manhole, handhole cover and open/close device therewith provides vertical pads at predetermined positions along a bottom edge of a manhole/handhole cover, which are integrally molded with a cover body. This forms an inclined a third edge which is longer than an inner diameter of a manhole/handhole neck such that it can prevent the cover body to bounce up and displace when being overlaid by a vehicle. Furthermore, a plurality of pre-molded flat plates are provided on predetermined locations perpendicular to the neck. A pre-punched hole is provided for each flat plate for accepting the vertical pad of the cover body for restraining the cover body in its position at the same time the cover body is overlaid by a vehicle.

Abstract: A manhole cover receiving frame includes an outer tube and a cover receiving frame. The cover receiving frame may be axially moved relative to the outer tube so that an upper surface of the manhole cover receiving frame matches the level of the surrounding road surface. The cover receiving frame is moved by a plurality of bolts threaded in the outer tube.

Abstract: A watertight manhole insert and tether apparatus designed to prevent rainwater from entering sanitary sewer or other systems through a manhole closed by a manhole cover. The manhole insert is located beneath the manhole cover and is connected directly to the manhole by a tether apparatus mounted in the manhole, to plug the manhole, prevent theft of the manhole insert and deny access to the manhole. The manhole insert is characterized by a pan-shaped insert body having a curved, flat or ribbed insert bottom and one or more pressure-relief valves, one or more lift straps and an upward-standing, sloping or perpendicular side wall fitted with an outwardly-extending top rim for engaging a shoulder shaped in the manhole to support the manhole insert in the manhole.

Abstract: A molded plastic extension member for use in increasing the height of manholes, or catch basins when surfacing or resurfacing a roadway. The extension member may be formed having a sloping upper planar support surface to thereby adjust the angle of the catch basin support frame or the manhole cover support frame. An outer surface of the extension member includes indicia that allows the user to align the slope of the upper planar support surface parallel with the roadway surface. When several sloped extension members are stacked, the indicia may be used to create a complex angle of slope relative to the underlying base members vertical axis. The extension member includes a pocket adaptable for receiving and retaining mortar between two stacked extensions. Planar surfaces may extend from both the upper and lower edge of the extension member, thereby providing support and added stacking surface for the stacked extension members.

Abstract: A synthetic resin tubular body is fitted into the pipe connecting hole of a handhole when used. The cut edge face at one open end side of the tubular body having square walls in cross section and circular walls in cross section which are alternately disposed in its axial direction is the boundary portion between a side wall portion forming the square wall in cross section and a peripheral wall portion forming the square wall in cross section, and is cut in the boundary portion on the side apart from the open end side or in the proximity thereof. The length of the tubular body is set greater than the wall thickness of the handhole. In addition to the tubular body, a block body for the tubular body is formed with square and circular recessed portions conforming to the outer peripheral face of the open end side portion of the tubular body.

Abstract: A manhole extender ring system 2 comprises an annular base member 4 having a flange 24 disposed therein, an annular insert member 32 slidably disposed within the base member 4 and supported by the flange 24, an annular ring member 44 having a ring top surface 46 slidably engaging the insert member 32 and supported by the base member 4 and a cover member 62 having a cover top surface substantially flush with the ring top surface 46 slidably disposed within the ring member 44 and supported by the insert member 32. The ring member 44 is removably mounted to the base member 4 by use of a variable, elongate stabilizer bracket 70 having a J-shaped end 78 and a C-shaped end 86. The J-shaped end 78 removably engages a shoulder 60 of the ring member 44 and the C-shaped end 86 removably engages the flange 24.

Abstract: A rapidly adjustable man-hole cover seat for sustaining the alignment of a road surface and a man-hole cover, comprises a base, an adjustable seat, a man-hole cover and a cruciform hole fixing frame, a stud block, a supporting block, etc. In a large distance adjustment, the inner rim of the adjustable seat is designed so that it may be penetrated by adjustable screws. Thus the adjustable seat may be adjusted and moved for aligning with the road surface. In another small distance adjustment, a cruciform hole fixing frames are installed on the bottom of the adjustable seat for being penetrated by screws so as to be installed on the base. Further, supporting blocks are installed for distributing the weight borne by the adjustable seat, the stud block and screws so that the man-hole cover may suffer a heavy pressure and the steadiness of the man-hole cover and road surface as cars are passing is sustain.

Abstract: The present invention provides a system, for raising a manhole ring during construction or roads, that includes placing a generally tubular form on a manhole cone in an excavation, and a method and trimming/cutting tool for adjusting the height of the form. Preferably, the cutting tool is positioned inside the form and is rotated around to cut a ring of material off of the top of the form. The cutting tool is set at an elevation, indexed off of the pavement around the excavation, which results in the form being cut to a height that can support a manhole ring at a proper elevation to be flush with the pavement surface of a particular site. Once the manhole ring is placed on the trimmed form, a single pour of concrete may be done to create a concrete collar that fills and seals the vertical space between the manhole cone and ring. The form may include a stabilizing system for holding the form in place on the manhole cone.

Abstract: A cover for a sewer basin with a pump is provided with upper and lower members. The bowl-like lower member has a central cavity which may be closed in a water-tight fashion by placement of the upper member onto the lower member in a frictional fit. A flanged surface on the lower member allows it to be sealed in water-tight relationship over a maintenance entry into the basin. A control panel for the pump is mounted in the central cavity. Access may be had to the control panel without a need to open the basin, and access may be had to the basin interior without a need for opening the central cavity or the control panel housed therein.

Abstract: A manhole adjustment ring to be disposed in a manhole frame having a surrounding side wall structure and an inwardly depending lip on which a manhole cover is supportably disposed, the manhole adjustment ring including a base frame and a spacer ring, with the base frame having a substantially continuous, rigid, ring like configuration structured to maintain substantially continuous, mating engagement with the manhole frame, while the spacer ring is adjustably coupled to the base frame and extends upwardly therefrom to a height sufficient to extend above the surrounding side wall structure of the manhole frame and define a protruding rim that accommodates a layer of pavement in generally abutting engagement with an exterior surface thereof.

Abstract: The invention relates to the use of a preparation for insulation/sealing and coating purposes, comprising an apolar, non-setting fluid polymer having a glass transition temperature lower than -60.degree. C., wherein the polymer has a surface tension of less than 40 mN/m above the glass transition temperature. Preferably, the preparation contains one or more fillers having a different particle size and a different particle size distribution.

Abstract: An improved drain board for use on a gutter particularly has a cover board pivotally secured to a mounting bracket. The cover board has an outwardly extended pivot pole at one corner thereof and an inwardly extended receiving tube at the opposite corner for accommodation of a bias spring and a movable pivot rod. At the corresponding corners of the mounting bracket is disposed an outwardly extended engaging tube respectively so as to permit the fixed pivot pole and the movable pivot rod of the cover borad to be pivotally mounted onto the mounting bracket and the cover board is well protected from being stolen with ease by burglars.

Abstract: A confined space manhole sign system for use in association with a manhole including a ledge and a manhole cover, the apparatus comprises a plurality of manhole insert members each having a circular base with an upper surface, an upstanding sidewall extending from the base and being formed contiguously therewith, two drain apertures being positioned at the intersection of the base and the sidewall, a flange being formed contiguously with the upstanding sidewall and extending radially therefrom, the flange having a lower surface including a plurality of perforation grooves formed therein; and a plurality of warning signs each having descriptive indicia marked thereupon, each of the warning signs being fixedly positionable upon the upper surface of the base, the system warning manhole workers of potentially dangerous situations within a manhole.

Abstract: A tank sump has a one-piece body comprising a hollow base member for collecting fluids leaking from a piping system, the base member having an upper portion and a lower portion, and a hollow riser section having an upper portion and a lower portion, the riser lower portion extending upwardly from the base member upper portion, the riser section having sidewalls with alternately adjacent vertically extending wall portions and outwardly extending, U-shaped grip portions. An integrally formed cover is defined on top of the riser section upper portion. The cover may be cut off from the riser section of the body. A gasket may extend between the cover outer periphery and the outwardly extending grip portion of the riser section, and a mechanism removably secures the cover to the outwardly extending grip portion with the gasket therebetween, in a substantially water resistant sealing manner. The cover may alternately be cut away from the body and discarded.

Abstract: A unitary sump frame made from a continuous material is disclosed. A substantially planar and continuous flange has an inner perimeter defining an opening in the frame and an outer perimeter. A lip is integrally connected to the flange and extends downwardly from the flange. The lip includes a securing mechanism that is operative to attach a component to the frame. A lug is integrally connected to the lip and extends away from the opening. The lug is operative for anchoring the frame.

Abstract: A method and article for sealing a manhole riser, a catch basin, and a pipe juncture. The method is an economical process whereby elastomeric bands are placed around and inside a manhole riser, a catch basin, or a pipe juncture and effectively seals the manhole riser, catch basin, or pipe juncture from loss of water or infiltration of water and other contaminants such as gases and salt.

Abstract: A replacement manhole cover assembly for an existing manhole having a fixed frame around the periphery of the manhole, the frame having an upper horizontal lip essentially flush with the surrounding pavement and a lower horizontal shelf, wherein the replacement manhole cover assembly includes an annular skirt selectively removable on the lower horizontal shelf of the frame, the skirt having a vertical extension terminating at a lower horizontal shelf for supporting a manhole cover made of composite material.

Abstract: An airport inset light adjustable alignment container set provides a light fixture and support having a non-threaded vertical wall container base for airport runway, taxiway, or other aircraft ground traffic areas and means for providing variable length extension for rotatably adjusting height by plus or minus 1/64 of an inch or more and azimuth alignment by about plus or minus one degree or more. For previously installed, old airport inset lights, a variable length extension assembly of the present invention can be connected to a fixed connecting flange for rotatably adjusting the height and azimuth alignment of a conventional prior art airport inset light, e.g., one which has been previously installed without the benefit of the present invention. In one aspect, an overlay protection plate protects against paving material entering the light fixture support during airport paving operations and locates the light fixture support after the airport paving operations have covered it.

Abstract: A manhole embodiment that includes a skirt made of flexible material, such as rolled sheet steel, having a stiffening flange extending laterally from the bottom rim of the skirt to increase the manhole lateral strength and provide a footing for the manhole and an outwardly extending lip at the skirt upper rim. The manhole top ring connects directly to the top of the lip. This eliminates the need for a separate piece such as the lower L-shaped ring piece included in conventional manholes. An optional extension skirt can telescope into the bottom of the upper skirt that can be held to the upper skirt by fasteners. The telescoping extension skirt can be height adjusted in the field so that the over-all height of the manhole can be adjusted to any desired height, say between 8 and 16 inches.

Abstract: A spacer arrangement is provided for use in raising the height of a manhole cover frame, including one or more base spacer elements and one or more upper side extension elements; said one or more base spacer elements are adapted to be located within said manhole cover frame with said one or more side extension elements extending upwardly relative thereto; the spacer arrangement is adapted to receive a manhole cover; at least an underside surface of said one or more base spacer elements includes downwardly directed projections for stabilizing at least said one or more base spacer elements.

Abstract: Disclosed is a chimney access structure which is particularly well adapted for use in grounds subject to freezing. This structure incorporates chimney provided with an upper end on which is mounted an adaptor provided with a vertical through-hole and with a countersink hole of greater diameter that the through-hole. The countersink hole is preferably frusto-conical and extends coaxially within the through-hole at a given depth from the upper face of the adaptor. This countersink hole defines a sleeve with upper portion of the adaptor which is provided with an inwardly projecting flexible sealing ring. A floating head is slidably mounted into the sleeve. This head has a vertical through-hole coaxial with the one of the adaptor. The floating head also has a lower portion provided with an outer lateral surface whose shape and size are selected to fit into the countersink hole of the adaptor and sealingly slide within the same thanks to the sealing ring.

Abstract: A watertight manhole insert and tether apparatus designed to prevent rainwater from entering sanitary sewer or other systems through a manhole closed by a manhole cover. The manhole insert is located beneath the manhole cover and is connected directly to the manhole by a tether mounted in the manhole, to plug the manhole and prevent theft of the manhole insert. The manhole insert is characterized by a pan-shaped insert body having a flat insert bottom and a pressure-relief valve, one or more lift straps optionally provided with a warning tag, and an upward-standing, sloping or perpendicular side wall fitted with an outwardly-extending top rim for engaging a shoulder shaped in the manhole to support the manhole insert. One end of the flexible stainless steel tether is connected to the manhole wall and the opposite end first extends through a grommet in the insert bottom and subsequently through a lever bar locking device.

Abstract: A spacer arrangement is provided for use in raising the height of a manhole cover frame, including one or more base spacer elements and one or more upper side extension elements; said one or more base spacer elements are adapted to be located within said manhole cover frame with said one or more side extension elements extending upwardly relative thereto; the spacer arrangement is adapted to receive a manhole cover; at least an underside surface of said one or more base spacer elements includes downwardly directed projections for stabilising at least said one or more base spacer elements.

Abstract: The present invention provides an improvement in manhole casting positioning apparatus and methods. In particular there is provided a casting positioning apparatus; for positioning a casting in relation to an upper end of a manhole, which comprises an inner sleeve comprising a rigid hollow cylinder having an annular flange extending around the upper circumference thereof. The diameter of the cylinder is less than that of the manhole lid opening. An annular resilient rubber ring or skirt whose inner diameter is slightly less than the outer diameter of the inner sleeve and whose outer diameter is greater than that of the manhole lid opening is stretched around the outer surface of the cylindrical inner sleeve. The lower end of the cylindrical inner sleeve is inserted into the upper end of the manhole, and lowered until the lower surface of the rubber ring rests on the upper edge of the manhole lid. Pressure is then applied downwardly on the flange of the sleeve to push it down to the desired height and slope.

Abstract: A manhole cover and frame assembly includes an outer frame having a support surface and a side wall that extends upward from the support surface and has a recessed portion. An inner frame is supportable on the support surface. The inner frame has a protrusion extending from the outer peripheral surface. The inner frame also includes an adjustable joint for adjusting the inner frame in its peripheral dimensions to expand to engage the protrusion with the recessed portion, thereby preventing upward movement of the inner frame, and to contract to remove the protrusion from the recessed portion. The inner frame also includes a cover support surface. A manhole cover is supportable on the cover support surface.

Abstract: A frame insert for raising the level of a drainage grate cover with respect to a catch basin frame. The frame insert includes a lug for providing a locking surface for a lock device connected to the grate cover. The lug permits a pre-existing lock which locked the grate cover to the catch basin frame to be used to lock the grate cover to the frame insert. The lock engages the frame insert lug at a new lock position which is approximately ninety degrees from the position where it locked the grate cover to the frame before installation of the insert.

Abstract: A sealing assembly for sealing a manhole against entering liquid includes a support ring fixed to the manhole's skirt and a sealing member resting on the support ring. The sealing member has a base with a foam ring under it, and pressing members on top of it for pressing the base against the support ring with the foam in between. The sealing member also has a top which is flexibly connected to the base. The top is fixed to the manhole cover with a gasket between it and the cover.

Abstract: A resilient annular transition collar is provided for roadway structures, including manholes and catch basins, which acts as a flexible transition between the rigid structure or frame of the manhole and the semi-rigid structure of the asphalt paving. The resilient transition collar absorbs any movement of the pavement during expansion and contraction and this absorption avoids the prior art problems of break-up, cracking and separation between manhole and pavement. Risers or adjusting rings may be employed in conjunction with the transition collar to ensure a flush fit between the pavement surface and the upper surface of the transition collar. A mold structure for forming the collars includes heat transfer studs to provide an increased production rate.

Abstract: A trench structure for a drain or chase is presented which can be quickly and economically constructed. A unique cap block, which has a notched face section for accepting a drain grate or trench cover and a laterally offset horizontal support section for retaining a paving member, forms the top rows of the trench side walls.

Abstract: A stackable height adjustment ring for supporting a manhole cover frame upon a concrete manhole shaft liner has a ring body that is formed from plastic resin, e.g., scrap plastic. The ring includes inner and outer radially spaced apart side walls and optionally a top wall. Brace arms which are integral with the walls preferably extend radially between the walls for holding them together. The rings have alignment members, e.g., an inner wall of the ring can have an upwardly facing shoulder upon its upper edge and the outer wall, a downwardly facing shoulder on its lower edge. An upwardly extending cylindrical collar at the top of the outer ring fits the downwardly facing shoulder of an adjacent ring. There is also a downwardly extending collar at the lower edge of the inner ring to fit on the upwardly facing shoulder of a similar inner ring.

Abstract: A spacer arrangement is provided for use in raising the height of a manhole cover frame, including one or more base spacer elements and one or more upper side extension elements; said one or more base spacer elements are adapted to be located within said manhole cover frame with said one or more side extension elements extending upwardly relative thereto; the spacer arrangement is adapted to receive a manhole cover; at least an underside surface of said one or more base spacer elements includes downwardly directed projections for stabilizing at least said one or more base spacer elements.

Abstract: A transition collar for use in road construction comprises an annular collar member made of elastomeric materials such as rubber. It has a generally planar top surface and a central opening sized to accommodate a rigid frame structure having an access opening formed therein. The collar member has a vertical outer wall that faces the road material, which outer wall has a number of horizontally extending, spaced apart ridges formed thereon. These ridges assist in securing the collar in a road bed. Preferably the uppermost ridge is spaced below the top surface of the collar. The collar can have a number of small bumps distributed over its top surface to improve traction for vehicles. Preferably these bumps have sloping sidewalls extending about their periphery. A cushioning device is used to adjust the position of the frame structure and comprises a flat, elastomeric member with exterior dimensions corresponding to those of the frame structure.

Abstract: The invention is a monitoring well cover with a generally planar lid, a generally cylindrical rim, and one or more generally cylindrical skirts. The lid has threads on its side to secure the lid to the rim. The rim has an L-shaped upper edge for receiving and sealing tightly with the lid and has snaps positioned around its lower edge for receiving and sealing tightly with one of the skirts. The skirts each having flanges positioned around their upper ends and snaps positioned around their lower ends such that the first of the skirts may seal tightly with the rim and each subsequent skirt may seal tightly with the skirt preceding it. The lid, the rim, and the skirt are all constructed from a fiber reinforced, heat stabilized, high strength thermoplastic.

Abstract: The manhole head assembly is for mounting a cover onto a manhole frame. This assembly has a lower annular rim member and an upper annular rim member. The lower member has a bottom side sized and shaped to rest on the manhole frame. It also has an opposite top side which has an inner surface portion sized and shaped to receive and support the peripheral bottom portion of the cover, and an outer surface portion. The upper annular rim member has a bottom side sized and shaped to rest onto the outer surface portion of the top side of the lower rim member in order to fully surround the peripheral edge of the cover when the same lays on the inner surface portion of the top side of the lower rim member. The upper annular rim member also has an opposite top side and a thickness substantially equal to the one of the peripheral sidewall of the cover. Bolts are used for anchoring to the manhole frame, the upper and lower rim members in operative position to receive and support the cover.