Abstract: A spacer for positioning and locking spaced reinforcing cages into a combined integral unit for reinforcing large concrete structures is disclosed that is readily snapped into place even with narrow lattice cages.

Abstract: The invention relates to a filter element consisting of a molded body of porous concrete, which element is arranged in the water stream of a purification system. In particular, the filter element (10) is a molded pervious concrete layer arranged as a partition between a lower compartment (9) and an upper compartment (11) of a treatment chamber (8), wherein the water inlet (12) opens into the lower compartment (9) and a water outlet (17) issues from the upper compartment (11). The pervious concrete filter layer may contain one or more additives to enhance adsorption of pollutants, such as heavy metal ions, phosphorous, hydrocarbons or other target soluble pollutants.

Abstract: A spacer for positioning and locking spaced reinforcing cages into a combined integral unit for reinforcing large concrete structures is disclosed that is readily snapped into place even with narrow lattice cages.

Abstract: In some embodiments, a filtration system may include one or more of the following features: (a) a housing having a bottom portion, a middle portion coupled to the bottom portion and all upper portions and a cap coupled to the upper portion, (b) a sediment storage area within the bottom portion, (c) a separator area within the middle portion, (d) a porous filter within the upper portion, (e) an access hatch within the cap, (f) an inlet pipe for allowing storm water within a middle chamber, (g) an outlet pipe for allowing filtered water to be discharged from the filtration system, and (h) a central pipe being a passageway through the porous filter.

Abstract: In some embodiments, a filtration system may include one or more of the following features: (a) a housing having a bottom portion, a middle portion coupled to the bottom portion and an upper portion, and a cap coupled to the upper portion, (b) a sediment storage area within the bottom portion, (c) a separator area within the middle portion, (d) a porous filter within the upper portion, (e) an access hatch within the cap, (f) an inlet pipe for allowing storm water within a middle chamber, (g) an outlet pipe for allowing filtered water to be discharged from the filtration system, and (h) a central pipe being a passageway through the porous filter.

Abstract: The invention relates to a filter element consisting of a molded body of porous concrete, which element is arranged in the water stream of a purification system. In particular, the filter element (10) is a molded pervious concrete layer arranged as a partition between a lower compartment (9) and an upper compartment (11) of a treatment chamber (8), wherein the water inlet (12) opens into the lower compartment (9) and a water outlet (17) issues from the upper compartment (11). The pervious concrete filter layer may contain one or more additives to enhance adsorption of pollutants, such as heavy metal ions, phosphorous, hydrocarbons or other target soluble pollutants.

Abstract: In some embodiments, a filtration system may include one or more of the following features: (a) a housing having a bottom portion, a middle portion coupled to the bottom portion and an upper portion, and a cap coupled to the upper portion, (b) a sediment storage area within the bottom portion, (c) a separator area within the middle portion, (d) a porous filter within the upper portion, (e) an access hatch within the cap, (f) an inlet pipe for allowing storm water within a middle chamber, (g) an outlet pipe for allowing filtered water to be discharged from the filtration system, and (h) a central pipe being a passageway through the porous filter.

Abstract: The invention relates to a filter element consisting of a molded body of porous concrete, which element is arranged in the water stream of a purification system. In particular, the filter element (10) is a molded pervious concrete layer arranged as a partition between a lower compartment (9) and an upper compartment (11) of a treatment chamber (8), wherein the water inlet (12) opens into the lower compartment (9) and a water outlet (17) issues from the upper compartment (11). The pervious concrete filter layer may contain one or more additives to enhance adsorption of pollutants, such as heavy metal ions, phosphorous, hydrocarbons or other target soluble pollutants.

Abstract: The mechanical signaling device is used for indicating when contaminates are present in water in a manhole so that the contaminated can be cleaned out of the manhole before the contaminates are released into the environment. The mechanical signaling device has a flag which moves up to a visible warning position when triggered by contaminates entering a float in the manhole which will then weigh the float down which pulls on a cable attached to a trigger which releases a spring loaded flag to pop up into view. The flag is easily reset by pushing it back down against the force of the spring until it is reset for release by the triggering mechanism. The mechanical signaling mechanism is housed in a pipe and has a protective cover preventing snow from resting on the top cover, further a top cover seals pipe when the flag is down.

Abstract: A stormwater treatment system designed to separate floating pollutants, liter, and contaminated settling solids from drainage discharge. The system uses a cylindrical tank, buried below the ground, which enables separation of the pollutants. The stormwater flows around the inside perimeter of the tank until it flows into an inner cylinder through a weir (or weirs). This causes a delayed flow due to the limited entry point through the vertical weir. The extended amount of resonance time allows for separation of pollutants, liter, and contaminated solids. The stormwater continues to separate itself as it flows around the inner cylinder, up through a vertical pipe and out an outlet pipe. The solid contaminants which are left behind are stored and able to be removed later.

Abstract: A stormwater treatment system designed to separate floating pollutants, liter, and contaminated settling solids from drainage discharge. The system uses a cylindrical tank, buried below the ground, which enables separation of the pollutants. The stormwater flows around the inside perimeter of the tank until it flows into an inner cylinder through a weir (or weirs). This causes a delayed flow due to the limited entry point through the vertical weir. The extended amount of resonance time allows for separation of pollutants, liter, and contaminated solids. The stormwater continues to separate itself as it flows around the inner cylinder, up through a vertical pipe and out an outlet pipe. The solid contaminants which are left behind are stored and able to be removed later.

Abstract: A collar for supporting or protecting pipes on an outside drop adjacent a manhole is provided. A plurality of stacked collar sections can protect pipes comprising the outside drop. Alternatively a plurality of collar segments having a circular wall within can form the pipe integrally with the collar. The collars can protect riser pipe sections or elbow piper sections. The collars may be split for ease of installation around pipes and fastened together around the pipe. The collars are easily attached to the manhole by drilling a hole into the manhole at designated places and using bolts through tabs on the collars to hold the collar in place adjacent the manhole. The collars can have several different standard heights and be stacked to the desired height of the manhole. Pipes having riser sections or elbow sections can have protective collars.

Abstract: A hole former assembly used to form a reusable hole former assembly used during the construction of a manhole base. The hole former assembly of the present invention aligns the center of the formed hole in the concrete manhole base sidewall with the center of an inlet or outlet opening of a canal bed liner embedded in the base of the manhole. The hole former assembly is suitable for use in either wet casting or dry casting the base of the manhole with the inlet and/or outlet of the invert embedded in a sidewall of the base of the manhole. Several of the component parts of the hole former assembly of the present invention may be molded as a single unit and thereafter separated, thereby reducing certain manufacturing costs of the component parts.

Abstract: A base for a manhole or catch basin structure having an embedded plastic canal-bed liner and a corresponding blocking member or hood. The plastic liner has an annular, outwardly extending flange which becomes embedded in a sidewall of the base to form a unitary structure when the concrete is poured. The liner is not subject to delamination from the canal-bed and includes bosses for additional anchoring to the base. The canal-bed liner and hood serve to protect the concrete base and sidewalls of the manhole or catch basin from corrosive fluids, thus extending the useful life of the manhole structure. The hood may be secured to the sidewalls of the structure or may be engaged and sealed to a rim of the liner.

Abstract: An extension collar suitable for engagement with an upper ledge of an invert liner positioned within the canal bed of the base of a manhole or catch basin structure. The extension collar is replaceable and is suitable for use in either new construction or rehabilitation of the manhole structure. A plurality of extension collars may be sealably stacked one on top of the other to create a corrosion resistant barrier at a desired height from the bottom of the base of the manhole or catch basin.