Abstract: A pit lid assembly is formed for a subsurface aircraft servicing pit and includes a lid frame formed with a flat, upper deck, a pit access opening surrounded by the deck, and a hinge pocket defined in the structure of the frame. The hinge pocket extends radially outwardly from the pit access opening and defines mutually opposing and mutually parallel pocket side walls. The pocket has a floor and an end wall slopes upwardly from the pocket floor at an obtuse angle relative to the surrounding flat deck of the frame. A pit lid is seated in the frame upon a bearing ledge formed about the periphery of the access opening. The pit lid has a hinge leaf projecting outwardly away from the access opening. Straight, narrow, linear bores are defined through the structure of both the hinge frame and the hinge leaf.

Abstract: Method of replacing a blind flange manhole cover of the type including a bolted on blind flange mounted on a bolting flange of a negative pressure storage tank manway with a manhole cover having a hinged door assembly includes the step of removing the blind flange manhole cover from the bolting flange of a tank-installed manway. The manhole cover may be attached to the bolting flange of the existing manway. A seal may be provided for creating a leakproof joint between the cover and a cover receiving surface when the hingedly attached manhole cover is in a closed position. A manway having a hingedly attached manhole cover may be provided with a hinge frame. A locking assembly may be provided adjacent the cover that includes a locking and sealing element for engaging the cover with a seal for locking and sealing the manway.

Abstract: Assemblies and methods are provided to divert liquids that would otherwise infiltrate utility manholes or other hatchways, while allowing gases to vent to the atmosphere. Preferred embodiments of the assemblies comprise a cover support frame, a sheet of water-repellent gas-permeable material occluding the central opening of the support frame and a cover mated to the frame. Preferably, a stiffening ring or other means of providing structural rigidity to the venting structure is provided. The assemblies are lightweight and are simple to install, and can be fabricated from materials that are readily available. Moreover, the assemblies can be easily modified to accommodate field conditions.

Abstract: The security manhole insert cover relates to a locking manhole insert to prevent ingress or egress to a manhole from above or below the manhole to prevent access to underground utilities, tunnels and underneath buildings and metropolitan areas to eliminate security intrusions and terrorist attacks by underground access, which would otherwise go undetected if access to the underground utility passages were not secured. The manhole insert cover has a cylindrical locking insert barring access to the engaging and disengaging mechanism required to remove the manhole insert cover and an integrated lower cover to prevent access to the engaging and disengaging mechanism from below, the insert cover adapted to fit within a manhole without required modification of the manhole and without detection of the insert cover having been installed from above ground levels.

Abstract: A rigid anti-theft cover (3), for covering of shafts leading to underground mains-water systems, hingedly mounted on a frame (1) with two side edges (32A, 32B) bearing two projecting parts (30A, 30B) and engaging into two cells (10) of the frame which are at least partially overhung by a wall (13) of this frame to provide an axis of articulation parallel to a hinging border (31) of the cover. The cover also has an elastic finger (36) extending parallel to the side edges (32A, 32B) with a free end situated in proximity to the hinging border (31) and co-operating with a pressure lug (14) borne by the corresponding hinging edge (11) of the frame to permit, by elastic deformation of the finger (36) supported against the lug (14), positioning of the projecting parts (30A, 30B) into their respective cells (10) and their removal.

Abstract: A method for detaching a manhole frame (7) that is embedded in a road surface, wherein the manhole frame (7) is cut horizontally starting from the inside, without significant exposure of the outside area surrounding the manhole frame (7), by using a horizontally oriented rotating cutting blade (15) that performs eccentric circumferential runs along the inside of the manhole frame.

Abstract: A concrete lid for an in-ground utilities box includes a plastic reinforcement structure filled with concrete. The plastic reinforcement structure includes one or more plastic sidewalls that protect the edges of the lid from damage. The upper and lower surfaces of the lid are exposed concrete (with the exception of the upper and lower edges of the one or more plastic sidewalls). The one or more plastic sidewalls laterally surround a plastic reinforcement grid, which is centrally located between the upper and lower edges of the one or more plastic sidewalls. The one or more plastic sidewalls can be integrally formed with the plastic reinforcement grid. The plastic reinforcement grid reinforces the concrete lid, eliminating the need for separate reinforcement material. Support struts can be used to support the plastic reinforcement grid while wet concrete is being poured into the plastic reinforcing structure.

Abstract: A corrosion resistant manhole unit having a rotationally molded plastic manifold forming a hollow chamber for providing access to sewer pipes to be connected to the manifold. A manifold inlet connector molded into the manifold for connecting the manifold to an upstream conduit and allowing an inflow of fluid to the hollow chamber. A manifold outlet connector molded into the manifold for connecting the manifold to a downstream conduit so that fluid flows out of the hollow chamber. A manifold riser molded atop the manifold having an open top forming an aperture for accessing the hollow chamber. The manifold riser extending upward from the manifold towards ground level for allowing equipment and personnel to access the hollow chamber through the aperture. A watertight removable riser cap is included for sealing the top of the riser to close and prevent fluid and debris from entering or leaving the manifold.

Abstract: A hydraulically adjustable manhole ring including upper and lower rings formed to provide a channel there between. The channel is sealed by in inner flexible membrane coupled between the inner circumferences of the upper and lower rings and an outer flexible membrane coupled between the outer circumferences of the upper and lower rings. A flowable setting agent is injected into the channel causing the upper ring to move relative to the lower ring.

Abstract: A sealing device that ensures the hermetic securing of the lid (5) in the access mouth (2) in order to prevent any infiltration of fluids from the outside or escape of gases from the interior. The device comprises a frame (1), a lid (5) that rests on said frame (1) with interposition of a sealing joint (6), and a crosspiece (12) in order to facilitate the securing of the lid (5) with the aid of a screw (21). The sealing joint (6) permits complete imperviousness be obtained in the sealing of the device.

Abstract: A manhole/handhole includes a cover and a frame base. A plurality of elastic fixtures are bonded below through holes of the frame base. The through holes are corresponding to fixing holes of the cover so that screw bolts pass through the fixing holes of cover and the through holes of frame base and are locked to the fixtures. The cover is combined with the frame base so as to prevent the cover from jumping. Besides, at least a heightening base is installed between the cover and the frame base. The heightening base is stacked on the frame base so that the manhole/handhole is leveled with road surface for economizing working and time of roadwork.

Abstract: A cover apparatus for temporarily covering access openings for water, drain, manhole and overflow pipes during construction, when the access openings are exposed, to prevent dirt, dust or unauthorized access to the access openings. The cover apparatus includes a top portion which extends beyond the access opening, a depending side wall which fits within the access opening, a outwardly flared lower side wall which extends below the depending side wall, a central ring depending from the top portion in spaced relation from the depending side wall, and a plurality of ribs extending between the central ring and the depending side wall. A pump means is secured within the central ring, and an expandable bladder in fluid communication with the pump means is positioned on the depending side wall, between the top portion and the outwardly flared side wall. When inflated, the expandable bladder seals the cover apparatus to the access opening.

Abstract: Method of replacing a blind flange manhole cover of the type including a bolted on blind flange mounted on a bolting flange of a negative pressure storage tank manway with a manhole cover having a hinged door assembly includes the step of removing the blind flange manhole cover from the bolting flange of a tank-installed manway. The manhole cover may be attached to the bolting flange of the existing manway. A seal may be provided for creating a leakproof joint between the cover and a cover receiving surface when the hingedly attached manhole cover is in a closed position. A manway having a hingedly attached manhole cover may be provided with a hinge frame. A locking assembly may be provided adjacent the cover that includes a locking and sealing element for engaging the cover with a seal for locking and sealing the manway.

Abstract: This highway device includes a frame and an element (14) for covering the frame, the frame (12) including a peripheral border with two walls delimiting a groove and the covering element being equipped with a projecting peripheral lip (32) engaging in the groove in the frame-covering position. The covering element (14) includes at least one ramp (44) extending between the lip (32) and the internal surface of the element, the ramp or ramps being intended to bear on the end edge of the peripheral border of the frame and thus guiding the covering element during the displacement of the latter with respect to the frame, under the action of a force exerted on the element in a zone opposite the ramp or ramps (44).

Abstract: Method and assembly for inspecting the contents of a connection box or a utility system such as a sewer, telephone electrical, gas etc. via an inspection plug. The inspection plug provides an inspection port and is insertable into a hole in a panel and is attachable to the panel by fixing elements such as a nut assembly, a locking mechanism, prongs, etc. The inspection plug may include a body, a peripheral shoulder, and a resiliently braced cap pivotally mounted in the body to close the inspection port. The peripheral shoulder supports the plug in place in the panel. The cap normally closes the inspection port, but is yieldably openable to allow an inspection probe or other device to gain access to the internal atmosphere for testing within the utility system or electrical connection box. The interior space of the body may contain a gel material, and the cap can be substituted with a resilient closure member having self-sealing openings therein for receiving an inspection probe.

Abstract: A cover for in-ground meter enclosures used in traffic loading conditions employs a relatively thin plate member formed of a ductile iron alloy and is dimensioned to extend laterally across a top opening of an in-ground meter enclosure. A plurality of relatively thick rib members of the ductile iron alloy are formed with and extend generally normal from the bottom side of the plate member. The plate member and the rib members together have sufficient strength and ductility to withstand total loads on the order of at least about 20,000 pounds on the top side of the plate member.

Abstract: A road gully or inspection cover assembly comprises an outer frame having an upstanding outer wall and integrally formed support structure extending inwardly of the lower regions of the outer wall over part at least of the peripheral extent of the 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 closing device with selective locking for closing a frame includes a roughly flat lid selectively applied to the frame, a lock connected with the lid, and a key which has a socket and an arm, one end of the arm carrying the socket. The lid has an opening for access to the lock by the key, the lock has a latch which cooperates with a catch of the frame, and the key selectively assumes, with respect to an opening, a locking position which the key can leave freely and in which the latch is trapped by the catch, and an unlocking position in which the key is trapped in the opening and in which the latch is disengaged from the catch. The arm and the socket of the key are roughly perpendicular to one another, and the arm is roughly perpendicular to the lid when the key is in the unlocking position.

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 present invention 10 discloses a disk-like member 15 that would be placed on the cover-retaining flange 20 in the manhole tube 22 on which the cover 16 would ordinarily rest. The operator would then insert a turnkey 24 through a central recess 26 in the manhole security device 10 until it matched up with its corresponding mate on the underside of the plate and then rotate the turnkey, thereby extending two locking members 46 in opposing directions until their tips 33 are imbedded in the soft metal of the manhole ring 18. The extended, imbedded locking members 46 below the cover retaining flange 20 prevent the manhole security device from being removed until the proper mating turnkey 24 is inserted and the locking members 46 are retracted. The manhole cover 16 is placed over the locked manhole security device 10 until such time that authorized removal is desired.

Abstract: A method of and system used for venting out buildup of explosive gases in a manhole caused by an explosion and including a support frame, a two inch thick plate member positioned on top of the support frame, a plurality of restraining assemblies and a manhole cover for covering the manhole. The support frame and the plate member are embedded into a street and positioned above the manhole, where openings are aligned with the manhole. Three retaining assemblies are positioned on opposite sides of the manhole cover. Each retaining assembly includes a rod, a stop plate, a coil spring, a support plate and a nut. The rod extends downwardly through the dirt and the horizontal concrete base ledge, where the stop plate, the coil spring, the support plate and the nut are positioned and secured to the other end of the rod.

Abstract: A quick manhole/handhole construction method and related devices is provided that includes a cutting unit and a manhole/handhole cover lifter. The cutting unit includes a radial feeding device, a cutting plate, a base, and a vessel, for easily carrying out the cutting task by fixing the base and operating the radial feeding device. The lifter is a single frame, and can be used to lift a manhole/handhole cover.

Abstract: A manhole/handhole includes a cover and a frame base. A plurality of elastic fixtures are bonded below through holes of the frame base. The through holes are corresponding to fixing holes of the cover so that screw bolts pass through the fixing holes of cover and the through holes of frame base and are locked to the fixtures. The cover is combined with the frame base so as to prevent the cover from jumping. Besides, at least a heightening base is installed between the cover and the frame base. The heightening base is stacked on the frame base so that the manhole/handhole is leveled with road surface for economizing working and time of roadwork.

Abstract: A kit for connecting and sealing a manhole cover frame to the upper surface of a chimney and a method of using the kit. The kit contains a spacer which may be cut to the proper length and to make allowances for any grade in the surface, a top flange which holds the top of the spacer to the manhole cover frame, and a bottom flange which holds the spacer to the upper surface of the chimney. The surfaces of the flanges which contact the lower surface manhole cover frame and the upper surface of the chimney contain coaxial recesses for holding butyl rubber sealant material in rope form. Watertight seals may be made with the use of light pressure. Additionally, the lower flange may be connected to the chimney with bolts. The surfaces of the flanges contacting the spacer contain a plurality of coaxial protrusions. The ends of the spacer are fitted with gaskets and sealed into the spaces between the protrusions on the top and bottom flanges to form watertight seals.

Abstract: Assemblies and methods are provided to divert liquids that would otherwise infiltrate utility manholes or other hatchways, while allowing gases to vent to the atmosphere. Preferred embodiments of the assemblies comprise a cover support frame, a sheet of water-repellent gas-permeable material occluding the central opening of the support frame and a cover mated to the frame. Preferably, a stiffening ring or other means of providing structural rigidity to the venting structure is provided. The assemblies are lightweight and are simple to install, and can be fabricated from materials that are readily available. Moreover, the assemblies can be easily modified to accommodate field conditions.

Abstract: A hole cover device is used to cover all or a portion of an excavation or hole. The hole cover device includes a top plate through which extends a screw mechanism that is coupled to a plurality of movable arms below the top plate. When a hole needs to be covered, the lower portion of the hole cover device (including the movable arms) is placed in the hole, with the top plate resting on the ground around the hole. The screw mechanism that extends above the top plate is then turned, which causes the movable arms below the top plate to extend outwardly until they engage the sides of the hole, making removal of the hole cover device very difficult. The screw mechanism may then be secured using a lock to assure the hole cover device may only be removed by authorized personnel. In a preferred embodiment, the hole cover device is for a circular hole, such as those drilled for fenceposts and electrical power poles, and therefore has a circular top plate with a diameter larger than the hole to be drilled.

Abstract: Method of replacing a blind flange manhole cover of the type including a bolted on blind flange mounted on a bolting flange of a negative pressure storage tank manway with a manhole cover having a hinged door assembly includes the step of removing the blind flange manhole cover from the bolting flange of a tank-installed manway. The manhole cover may be attached to the bolting flange of the existing manway. A seal may be provided for creating a leakproof joint between the cover and a cover receiving surface when the hingedly attached manhole cover is in a closed position. A manway having a hingedly attached manhole cover may be provided with a hinge frame. A locking assembly may be provided adjacent the cover that includes a locking and sealing element for engaging the cover with a seal for locking and sealing the manway.

Abstract: A stackable riser having a substantially smooth outer surface has a first open end defined by an edge and a second open end defined by a pair of adjacent channels, so that the edge defining the first open end of a first riser can mate with one of the channels defining the second open end of a second riser. A detachable anchor tab extends radially from the outer surface about the circumference of the riser. A plurality of risers can be stacked one on top of another, with, for example, the bottommost riser embedded in concrete and the risers above it embedded in soil. Preferably, the anchor tab of the bottommost riser remains attached to the riser and the anchor tab of the risers above it is removed.

Abstract: Assemblies and methods are provided to divert liquids that would otherwise infiltrate utility manholes or other hatchways, while allowing gases to vent to the atmosphere. Preferred embodiments of the assemblies comprise a cover support frame, a sheet of water-repellent gas-permable material occluding the central opening of the support frame and a cover mated to the frame. Preferably, a stiffening ring or other means of providing structural rigidity to the venting structure is provided. The assemblies are lightweight and are simple to install, and can be fabricated from materials that are readily available. Moreover, the assemblies can be easily modified to accommodate field conditions.

Abstract: For the purpose of anti-theft securing of a rigid cover (3) hingeably mounted on a frame (1) and comprising two side edges (32A, 32B) bearing two projecting parts (30A, 30B) defining an axis of articulation parallel to a hinging border (31) of the cover and engaging into two cells (10) of the frame which are at least partially overhung by a wall (13) of this frame, this cover comprises an elastic finger (36) extending parallel to the side edges (32A, 32B); the free end of the finger is situated in proximity to the hinging border (31) and co-operates with a pressure lug (14) born by the corresponding hinging edge (11) of the frame in order to permit, by elastic deformation of the finger (36) supported against the lug (14), positioning of the projecting parts (30A, 30B) into their respective cells (10) and their removal.

Abstract: A manhole access for sewers. More particularly, the present invention relates to a manhole that is adjustable in height and/or pitch to allow the top of the manhole top section to conform to the pitch of a surrounding surface, such as a road. Specifically, there is a cover, configured to cover access to the manhole extension, and an adjuster, coupled between the cover and the manhole extension, designed to be positioned in multiple positioned that form an angle of the cover relative to a top edge of the manhole extension. The adjuster has a cover coupler, positioned on a top side of thereof, designed to releasably hold the cover; and manhole extension coupler, positioned on a bottom edge thereof, designed to hold the adjuster proximate to the top edge of the manhole extension.

Abstract: A gate valve box adaptor structure, the present invention provides a permanent support for the key box bonnet that is unaffected by the surrounding environment. The adaptor is supported on the gate valve to a positive location for the key box bonnet at a level which prevents infiltration of soil and moisture into the bonnet. The adaptor is provided with a resilient gasket of a unique design to provide a cushion and to create a seal for the bonnet on the gate valve. A plurality of liquid infiltration prevention structures for preventing liquid infiltration into manhole assemblies.

Abstract: A lid lifter mount is installed on the hinge pin of a conventional manway lid, and has a compression spring assembly engaging a lever which is also installed on the hinge pin. The lever has a bar engaging a lid hinge arm. A spring force adjustment screw connected to the mount enables adjustment of the amount of lift assist the bar applies to the hinge arm by cam action against the arm as the operator lifts the lid. Two embodiments are shown for attachment to two types of lid hinges.

Abstract: An assembly for adjusting the elevation of a structure such as a manhole or a catch basin to be surrounded by pavement. A one-piece is formed to be inserted between a base rim and a cover of the structure. A lower member of the adapter is received in the base rim to be supported on an internal shoulder. An upper member extends outwardly of the lower member to receive the cover and upwardly to engage the upper end of the base rim and form an upward extension of the rim. The elevation of the structure may be increased by inserting the adapter between the base rim shoulder and the cover and decreased by removing the adapter from between the base rim shoulder and the cover. Additional adapters of identical construction may be inserted to further increase the elevation of the structure, all the adapters being nestable within one another.

Abstract: The present invention is provided with a key hole insertion fitted to a manhole cover, a manhole cover locking apparatus equipped with the key hole insertion, a manhole cover locking system, a method for unlocking the manhole cover, and a control system for opening and a closing manhole cover, which is designed to prevent an external access to the key hole of the manhole cover, thus attaining a sound and severe locking management. The electrical locking assembly can be added to conventional manhole covers in a simple way. The structure of the invention is characterized in a key hole insertion A inserted in a key hole 3b of the inner manhole cover 3 or the key hole 5b of the manhole cover 5 enough to engage pins 11b with engaging openings 12b of the cap holding member 12 secured to the key hole 3b or the key hole 5b. This allows the key hole insertion A to be locked to the key hole 3b or the key hole 5b.

Abstract: A plate support device for use during road repairs for creating a smooth transition from the road to the plate member. The plate support device for use during road repairs includes a support member having a bottom wall and a plurality of tapered side walls with each side wall having an outer top surface, an outer lower surface, and an outer intermediate surface which is slanted at an angle relative to the top surface and lower surface thus forming a ramp portion. The bottom wall has a plurality of holes therein, which include a first set of holes and a second set of holes which is larger than the first set of holes for fastening the support member and plate member to the road.

Abstract: A cover for in-ground meter enclosures used in traffic loading conditions employs a relatively thin plate member formed of a ductile iron alloy and is dimensioned to extend laterally across a top opening of an in-ground meter enclosure. A plurality of relatively thick rib members of the ductile iron alloy are formed with and extend generally normal from the bottom side of the plate member. The plate member and the rib members together have sufficient strength and ductility to withstand total loads on the order of at least about 20,000 pounds on the top side of the plate member.

Abstract: A structure for use with low flow stormwater drainage includes a two-piece outer cylindrical housing and a removable inner cylindrical flow cartridge containing a replaceable filter media. The housing consists of a sealed basin with a removable lid. The cartridge is suspended within the housing by an open tubular mechanical support extending downward from the housing lid. The bottom of the cartridge is above the bottom of the housing. The cartridge has a permeable screened bottom and a screened orifice at the top where the open tubular support attaches. An inlet into the housing accepts fluid flow transverse to the vertical axis of the cartridge at a depth location near the cartridge vertical midpoint. In operation, hydrostatic head pressure forces stormwater flow into the housing where primary separation of insoluble contaminants occurs. Contaminants with a density less than water remain inside the housing but outside the cartridge at a depth near the housing lid.

Abstract: A cover for closing a utility access opening disposed in a fabricated surface having a defined external appearance. The cover includes a cap member engageable within the opening and having a substantially full cross sectional cavity for receiving a selected material. When the selected material is situated within the cavity, the cap member provides an exposed exterior having an appearance substantially identical with the defined external appearance of the fabricated surface. The cap member preferably includes a plurality of holes for draining moisture from its cavity site, a plurality of hand engageable grips for lifting the cover from the opening, and a plurality of support posts disposed within the cavity for weight stabilization. The present invention additionally includes methodology for constructing a fabricated surface having at least one opening therethrough that is closeable with a cover whose appearance replicates that of the surrounding surface.

Abstract: A steel manhole is provided which includes a steel box having a hole having a bolt hole and formed at an upper portion of the same, a height control pipe having a vertical longitudinal hole inserted into an inner diameter portion of the hole, a multi-hole lid for covering an upper portion of the height control pipe, a male screw formed at left and right portions of the steel box and having a male screw portion, and a female screw having a thread portion for being threaded with the male screw pipe.

Abstract: A manhole cover mounting structure includes an outer frame fastened to a manhole box by screw bolts, the outer frame having an upright guide rod in each of a plurality of hollow peripheral locating blocks thereof, an inner frame adjustably fastened to the inner frame to hold a cover plate in flush with the road surface. The inner frame has a plurality of female screws fastened to peripheral lugs thereof to hold a respective hollow screw rod for the mounting of through bolts; thereby securing to secure the inner frame to the upright guide rod in each locating block of the outer frame.

Abstract: A temporary ramp having a plurality of segments coupled together by way of interlocking mating shapes located along the edges of adjacent ramp segments. Hinges couple adjacent ramp segments together. Fastener openings defined in the ramp segments allow a fastener to be fixed with the underlying roadway to help secure the ramp segment in position.

Abstract: A cover for in-ground meter enclosures used in traffic loading conditions employs a relatively thin plate member formed of a ductile iron alloy and is dimensioned to extend laterally across a top opening of an in-ground meter enclosure. A plurality of relatively thick rib members of the ductile iron alloy are formed with and extend generally normal from the bottom side of the plate member. The plate member and the rib members together have sufficient strength and ductility to withstand total loads on the order of at least about 20,000 pounds on the top side of the plate member.

Abstract: A manhole restraining system used for venting out explosive gases in a manhole caused by an explosion. The manhole restraining system comprises a support frame, a two inch thick plate member positioned on top of the support frame, a plurality of restraining assemblies and a manhole cover for covering the manhole. The support frame and the plate member are embedded into a street and positioned above the manhole, where openings are aligned with the manhole. Three retaining assemblies are positioned on opposite sides of the manhole cover. Each retaining assembly includes a rod, a stop plate, a coil spring, a support plate and a nut. The rod extends downwardly through the dirt and the horizontal concrete base ledge, where the stop plate, the coil spring, the support plate and the nut are positioned and secured to the other end of the rod. A PVC pipe is provided with the rod for allowing the rod to move smoothly up and down without any friction.

Abstract: An innovative composite decking concept employing a wooden core surrounded by a fiber-reinforced plastic material is described. The invention is low-cost, durable, and performs well structurally.

Abstract: A manhole for a storm sewage system comprising a structure having at least two outwardly extending substantially vertical flat panels projecting outwardly from the exterior surface a predetermined distance on opposite sides of the base portion of the manhole.

Abstract: A gate valve box adaptor structure, the present invention provides a permanent support for the key box bonnet that is unaffected by the surrounding environment. The adaptor is supported on the gate valve to a positive location for the key box bonnet at a level which prevents infiltration of soil and moisture into the bonnet. The adaptor is provided with a resilient gasket of a unique design to provide a cushion and to create a seal for the bonnet on the gate valve.

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: A pair of high-quality material threaded nuts are secured to a trench plate for subsequent placement of a hoist ring thereto.

Abstract: A gate valve box adaptor structure, the present invention provides a permanent support for the key box bonnet that is unaffected by the surrounding environment. The adaptor is supported on the gate valve to a positive location for the key box bonnet at a level which prevents infiltration of soil and moisture into the bonnet. The adaptor is provided with a resilient gasket of a unique design to provide a cushion and to create a seal for the bonnet on the gate valve. A plurality of liquid infiltration prevention structures for preventing liquid infiltration into manhole assemblies.