Abstract: A ramp for loading containers on or loading containers from an elevated surface provides a collection space for containing spillage on the ramp. The ramp is wedge-shaped and has an upper inclined load carrying wall and a bottom wall joining the load carrying wall at one end thereof. Sidewalls and an end wall join the load carrying and bottom walls to define an internal containment chamber. At least one drain opening is provided in the load carrying wall for collecting and for directing any spillage on an upper surface of the load carrying wall to the internal containment chamber.

Abstract: A filter device made from netting mounted on the end of a storm sewer to receive the flow of water and debris carried by same and allow the water to flow on through while retaining the debris. The filter has multiple parts joined by quick release fasteners. The same fasteners connect the device to the storm sewer outlet.

Abstract: A trench liner system used for lining a single containment trench and for forming a dual containment trench from a single containment trench comprising a primary liner means within the trench supported by a separating means between the primary liner and the trench walls and bottom, and a means for holding the primary liner means and the separating means to the trench walls. The separating means comprises a plurality of pairs of elongated members disposed along the trench such that the rear surface of each elongated member is in contact with one wall of the trench and the underside surface of each member is in contact with the bottom of the trench. The elongated members are in opposed relationship to each other. The length of the lower portion of each elongated member is less than one-half the width of the bottom of the trench so that a gap is formed between the distal edges of the lower portions to position therein a means for detecting a leak in the primary liner.

Abstract: A method for cutting first and second complementary foamed plastic bodies of a predetermined shape from a single workpiece includes the step of moving a linear cutting element through the workpiece. The linear cutting element, such as a heated wire, is moved through the workpiece to form a first surface which forms a portion of the predetermined shape of the first and second foamed plastic bodies. The workpiece is thereafter shifted in position relative to the linear cutting element and the linear cutting element is again moved through the shifted workpiece to form a second surface. Due to the shifting of the workpiece, the first surface is sloped relative to the second surface. The first and second foamed plastic bodies are preferably first and second trench forms defining the shapes of different sections of a trench drain which has a continuously sloped bottom surface.

Abstract: A grate attachment fixture is disclosed which rotationally engages a locking bar with the opposed sidewalls of a drainage channel and which thereafter secures a grate to the drainage channel. The grate attachment fixture includes a rotatable connector adapted to adjustably interconnect the locking bar and the grate. The grate attachment fixture also includes a grate securing member affixed to the locking bar. The grate securing member includes a pair of adjustment surfaces including a positive engagement surface for engaging a portion of the connector such that upon rotation of the connector in a first angular direction, the locking bar initially rotates within the trench in the first angular direction until the first locking bar engages the opposed sidewalls. Thereafter, the positive engagement surface cooperates with the connector to apply a tensile force between the grate and the locking bar upon further rotation of the connector.

Abstract: A system for forming a single-walled trench comprising a pair of frame members, each having a horizontal section and a section depending from the horizontal section; a collapsing pair of wall pans having sidewalls interior to the depending portion of the frame members, a bottom floor disposed between the sidewalls, a releasing mechanism to collapse inward the sidewalls, a device which collapses the sidewalls inward and removes the entire bottom and sidewalls from the poured trench leaving the frames embedded securely in the concrete; and adjustable anchoring means attached to the frame members for providing vertical adjustment of the frame members relative to the ground and each other, leaving all but the frame members available for re-use.

Abstract: Drainage gutters for installation in the ground are known which comprise a gutter body at the upper edges of which are integrally cast frames into which a cover can be placed. As they are installed in the ground the drainage gutters are sealed from the ground along their upper edges by means of first sealing devices. To produce a watertight seal between each two drainage gutters that abut one another by their end faces, second sealing devices are provided. These sealing devices each comprise grooves that can be filled with a sealant. The known drainage gutters are not completely watertight with respect to the ground. It is proposed to provide connecting channels between the first and the second grooves, so constructed that the sealant of the first sealing devices can be introduced so as to be continuous with the sealant of the second sealing devices by way of a complete or integral transition region.

Abstract: This invention is a box filter used in conjunction with newly constructed storm drains and the like to prevent undesirable amounts of sediment and other debris carrier by storm runoff from entering the storm drain. Upper and lower frames are provided with expanded metal interior and exterior sidewalls extending therebetween. The box-like structure has an open bottom, reinforcing plates adjacent the connection of a lift handle and corner braces to add rigidity to the system. An aggregate such as crushed stone is placed between the interior walls and exterior walls of the filter and act as a filter media for the sediment of the debris. This filter is reusable without loss of its filtering qualities due to its rugged construction and back flushable filter medium.

Abstract: A trench forming assembly and removable form for forming a trench of predetermined shape is disclosed according to the present invention. The removable form includes an elongate form body having top, bottom and opposed side surfaces and first and second elongate form removal slots extending upwardly from the bottom surface of the form body. Preferably the removable form has a top surface defining a complex shape including at least a first upwardly extending ear portion which extends longitudinally along the top surface. At least a first form removal slot of this elongate form body extends into a portion of the first ear portion. Advantageously, the form body includes a pair of coplanar elongate slots integrally formed in the side surfaces for receiving a pair of frame members in a predetermined coplanar, spaced relationship above the bottom surface of the form body.

Abstract: Surface drainage apparatus comprises a channel body defining a drainage channel with a cover defining apertures through which drainage can pass into the drainage channel. A fixing means for attachment of the cover to the channel body is provided and comprises a first fixing element for attachment to said channel body and a complementary second fixing element for attachment to said cover. The second fixing element comprises a bolt that is mounted in the cover so as to be capable of sliding into a locking position in the direction toward a long edge defined by said cover and back out of this locking position into an opened position. The first fixing element comprises a retaining means which when the bolt slides into the locking position engages with the bolt in such a way that said cover is retained on the channel body.

Abstract: A replacement re-cover drain top for a deteriorated top of an existing drain situated in the deck area about a swimming pool. The re-cover top is of a channel-like section and is adapted when installed to overlie an existing drain from which its previous top has been at least partially removed. Drain apertures in the top communicate with the drain on which it is installed from below the upper surface of the top to a depth corresponding at least to the flush level of the adjacent decking.

Abstract: Surface drainage apparatus is provided comprising a channel body defining a drainage channel and a cover for the channel. A fixing means is provided for attachment of the cover to the channel body and comprises a first fixing element for attachment to the channel body and a complementary second fixing element for attachment to the cover. The first fixing element comprises a clamping spring defining a receiving opening and the second fixing element comprises a peg formed with an enlarged end that is a leading end for insertion of the peg into the clamping spring. The clamping spring and the peg are constructed so that the peg can be inserted into the receiving opening, thereby elastically deforming the spring, and retained therein after insertion in a direction substantially perpendicular to the plane of the cover.

Abstract: A water permeable landscape ditch cover comprising a monolithic body with a paved, water permeable surface comprised of a aggregate material and a synthetic resin binder.

Abstract: A drain inlet provides a hollow concrete shell and has a cylindrical bottom section and a square top section. A first opening in the bottom section includes a first lip formed on an interior wall thereof and recessed from the bottom opening. The first lip includes a first step and a second step. A gasket is adapted to fit within the bottom opening and abut the first step. The second step provides a stop for inserting the drain inlet over a riser. A second opening in the top section includes a second lip formed on an interior wall thereof and recessed from the top opening.

Abstract: A locking manhole insert to be placed under a conventional manhole cover to prevent unauthorized access to the manhole. The insert includes a plate-shaped disc with a plurality of locking radial arms mounted to its undersurface. The locking radial arms are securable in the extended position using a conventional padlock. The insert further includes apparatus for suspending equipment, such as pollution monitoring units, within the manhole opening.

Abstract: A method and apparatus for forming a trench with grates or solid covers, comprising an outer shell which is disposed between opposed frame members at a certain position within a ditch and an inner core that is received within a channel in the shell. The core aids in providing rigidity to the shell while concrete hardens about the outer surface of the shell. Rods are vertically driven through the core and the outer shell into the bottom of the trench to stabilize the forms while the concrete or other setting material is poured into the trench. The rods are removed before the material hardens. After the encasing material sets, the core can be removed from the shell which then enables the shell to be more easily displaced from the formed trench.

Abstract: A waste water fitting support assembly for merging seepage water with waste water which has passed through a waste water fitting, when mounted in a support member of the assembly, is disclosed. The assembly includes the support which has a body with a through bore and a flange around the entry end of the bore and a fall and cap member having a tubular body with a flange at one end of the body. The support passes through the fall and cap member and the flange of the support rests with the flange of the fall and cap member. The support bore has an entry portion of large diameter for providing a seepage water receiving zone and an exit portion of lesser diameter and an intermediate transition portion where there is a bore size reducing shoulder with associated abutment means for axially limiting the entry of a waste water fitting into the bore and where there is means for axially sliding frictional engagement by a waste water fitting to centrally position the waste water fitting in the body bore.

Abstract: A portable rinse deck for farm chemical sprayers includes a center sump pit connected to radially extending sections sloped toward the sump pit for collecting spray chemicals washed from spray equipment on tractors, airplanes or helicopters. The radial sections include inner, middle and outer panels arranged to form right and left half sections. A radially extending channel receives the side flanges of adjacent panels with the radial channels feeding any chemicals leaking through the platform to the sump pit. A hub assembly is positioned over the sump pit and includes support channels which receive the inner ends of the radial channels for feeding the sump pit.

Abstract: An assembly (10) for forming a trench (T) includes one or more frame members (16) that cooperate with a removable form (12) around which a moldable trench forming composition (C) is poured. The form is made of deformable buoyant material such as expanded polystyrene. Rebar legs (18) are attached to the frame members to provide secure anchoring of the frame members to both the ground (E) and in the trench forming composition. Preferably, each frame member includes a horizontal leg that is received in a slot (22) formed in one of the opposing side walls of the form. Wire strands (28) are placed within cooperating guide tracks (24) in the opposed ends of the form. The wire strands are pulled through to deform the form after the composition has hardened.

Abstract: A system for forming a multi-walled trench comprising a pair of frame members, each having a horizontal section and a section depending from the horizontal section; a holding pan having sidewalls exterior to the depending portion of the frame members, a bottom floor disposed between the sidewalls, and flanges on each sidewall extending parallel to the plane of the horizontal section of the frame member and away from the depending portion; an outer wall disposed within the holding pan having an inside surface and an outside surface, the outside surface of the outer wall engaging at least a portion of the sidewalls and the bottom walls of the holding pan; an inner wall disposed within the outer wall having an inside surface and an outside surface, the inside surface of the inner wall engaging at least a portion of the inner surface of the depending portion of the frame members, and a cavity being formed between the outside surface of the inner wall and the inside surface of the outer wall; means in the cavity f

Abstract: A ground engaging hollow, disklike support mounted coaxially about the top end of the upper section of an underground valve box and having a conical top wall which sheds water to the outer edge of the disk to prevent softening and erosion of ground under the disklike support leading to vertical destabilization of the valve box.

Abstract: A clip-type support for use in installing trench drain systems. The clip device has two clip structures spaced from each other along a central web to engage, clamp and support two inter-engaging end portions of adjacent drain channel sections. A middle portion of the clip device separating the two clip structures has two deformable tabs, each located on opposite sides of the web. The tabs have apertures for engaging support rods which support the clip and drain channel sections within a trench in which the trench drain system is being installed. By deforming the tabs, the apertures are aligned relative to the rods thereby allowing the clip to move along the rods to align the adjacent drain channel sections. When the tabs are not deformed, the apertures are not aligned thereby locking the clip in place relative to the rods.

Abstract: Apparatus, methods and media for filtering liquids are especially suited for insertion into an existing storm water catch basin. The filtration that occurs reduces concentration of storn water runoff pollutants including heavy metals, suspended solids, particles and oil and grease. While being able to handle the high flow rates of storm water runoff, the filters also remove small particles and oil and grease the filters are arranged such that overflow from uppermost filters, as they become clogged, is directed by overflow weirs to change direction to allow filtration by lower filters. Storm water surges during peak intensity are permitted to over flow directly into a catch basin to prevent ponding. The invention can also be used above ground to treat pumped liquid from industrial and environmental sources.

Abstract: A safety trench drain conduit formed of first and second trench drain elements each in the form of an open top channel having imperforate bottom and sidewall portions. The first trench drain element is located and retained within the second trench drain element and is constructed and arranged to allow liquid access thereto from outside the second trench drain element. The second trench drain element bottom and sidewall portions envelope those of the first trench drain element. The second, outer, trench drain element sidewall portions include transverse surfaces above and laterally outward of and sloped inwardly toward the first trench drain element to direct any seepage near the entrance of the trench drain toward the open top of the first trench drain element.

Abstract: A covering element for covering drainage channels on sports fields provides for good surface drainage with a reduction of the danger of accidents for athletes consists of a section plate, made of aluminum, for example, which rests on shoulder surfaces of the drainage channels, and includes side support walls and water drainage slots arranged in the middle. Injury preventing edge elements are mounted with support ribs and the height of support walls and the thickness of edge elements over the support walls are about equal to the height of the upstanding edges of the drainage channels, so that water can consequently flow off well. The edge elements are made of a rubber of Shore hardness A75, so that no danger of injuries to athletes exists, and the edge elements may be colored white for the track side and green or red for the turf side of the sports field.

Abstract: A drainage channel comprising a channel body which is U-shaped in cross-section and defines a concave base and integrally formed opposing first and second vertically spaced-apart side walls, the first and second side walls including respective crowns formed in upper free ends of the side walls. The upper free end of the side walls define a predetermined thickness between respective inner side wall surfaces and outer sidewall surfaces. The outer surfaces of the side walls define an elongate detent spaced below the upper free ends of the first and second side walls and extending along at least part of the length of the channel body and defining an area of reduced thickness below the relatively thicker free ends of the first and second side walls. A coping encloses the crown of a respective side of the channel body. The coping includes an inner leg for resting against the inner side wall surfaces of the channel and an outer leg for resting against the outer side wall surfaces of the channel.

Abstract: A system for collecting and purifying polluted air over a large geographic area where surface level water channels are used for rainfall drainage. The water channels are covered to render them air passages as well, and air jet engines draw the polluted air from the areas to a purifying station where debris is separated and the polluted air is passed to purifying units before being discharged from the station. The water channels may be covered to provide lineal parks or roadways for light traffic. Also, sewage passages may be incorporated in the system to provide greater area coverage and reduce noxious fumes.

Abstract: A grating type pipe covering and protector which can be located either within the interior of a pipe or be attached to the outer walls of the pipe at its exit or its entrance openings includes a grating protector employing a two part grating covering having a common support about which both grating portions can pivot onto each other. Both parts of the grating covering have means thereon for affixing the grating to the walls of the culvert pipe.

Abstract: The gully closure for preventing the pollution of bodies of water in accident situations consists of a flexible mat (1) which covers the gulley surface and is coated with a highly viscous, free-flowing moulding composition (2). A plastically deformable silicone gel has proved particularly successful as a free-flowing moulding composition (2).

Abstract: A roadway drainage installation comprising a roadway, an elevated pavement extending alongside the roadway, and a more or less horizontal apron extending alongside the roadway so that it is located between the roadway and the pavement at the level of the roadway. A curb extends upwardly from the apron to the pavement so that the apron and curb define between them a water pathway. A storm water conduit runs below the pavement, the apron and the roadway. A curb inlet device comprises an opening in the apron as well as an opening in the curb, with the openings being in communication with each other. The curb inlet device is connected to the storm water conduit such that water can pass from the water pathway, through the openings into the storm water conduit. Water-deflecting members are located in the apron opening.

Abstract: The present invention consists of a metal trench grating and the method of manufacture by which it is constructed. The trench grating consists of plural cross bars having equi-spaced slots and a plurality of elongated rails inserted within the respective cross bar slots, and wherein a single weldment across the bottom of each cross bar provides complete fastening of the assembled trench guard. The method of manufacture stresses simplicity and quick assembly as the plural longitudinal rails are inserted in the plural-slotted cross bars and supported for final welding across the bottom central slot of each cross bar to produce the final form trench grating.

Abstract: A cover assembly for an opening comprises a frame and a covering. At least one elastically deformable, rod-like closing member, which extends substantially in a horizontal plane, is provided on the covering. The closing member forms one part of a locking device, the other part of which is a retaining member which includes a groove provided in the frame, in which can engage a closing finger of the closing member accompanied by an elastic bending of the closing finger in the horizontal plane.

Abstract: A method of manufacturing a three-sided culvert includes prestressing tendons in the culvert form. A series of prestressing tendons are secured within a form adapted for casting a concrete culvert having three orthogonal sides. The prestressing tendons are utilized in the top slab of the three-sided culvert and are positioned within the form prior to the pouring of concrete therein. Reinforcing steel can be eliminated along with the costs associated therewith and a culvert configuration can be provided with enhanced strength and improved material properties. Such culverts may thus be provided in modular form for placement upon foundations at remote locations for the creation of bridges, drainage areas and the like.

Abstract: An elongate safety conduit or trench for receiving chemical liquids, having first and second preassembled conduit elements, the first located and retained within the second. A space is between the two at the bottom for collecting liquid that may leak through the first. A seal along the length of the conduit between the two elements inhibits entry of liquid between the two.

Abstract: The passage of a scupper drain is normally maintained in a closed position by a pair of spring-biased semi-circular pivotal flaps which are mounted within a housing provided with an associated cap, thus permitting the flaps to only pivot downwardly for opening the drain to water discharge and preventing vermin from leaving the drain when the flaps are disposed in the closed position.

Abstract: A cover assembly for an opening comprises a frame and a covering. At least one elastically deformable, rod-like closing member is provided on the covering. The closing member forms one part of a locking device, the other part of which is a retaining member which includes a groove provided in the frame, in which can engage a closing finger located on the closing member accompanied by the elastic deformation of the closing member. Thus, in a simple manner, the covering is positively secured in the frame.

Abstract: In constructions with a relatively limited ground height, e.g., bridges, flat roofs, etc. the foundation or earthwork is covered with a sealing sheet, which extends up to a drain casing or frame. To avoid a return flow of liquid below the sealing sheet and into the foundation, in the arrangement according to the invention, the edge portion of the sealing sheet is laid downward over the wall of the frame or the casing. A locking frame is placed on the edge portion of the sealing element. The locking frame can additionally be secured in position by vertical threaded bolts and is used for pressing the edge portion of the sealing sheet onto the frame or onto the casing.

Abstract: A hydraulic structure is provided in the form of a flexible, flat, corrugated plastic tube having a relatively oblongated cross-section, with apertures associated with the grooves of the corrugation. The tube is enclosed in a geotextile sheath. The two relatively flat sides or panels of the tube are separated from each other by a plurality of pairs of cuspations, which project inwardly from the panel surface. Cuspations from the opposing panels are secured to one another thereby providing increased structural integrity.

Abstract: A drainage system for location adjacent a pavement subbase includes a tube of a geotextile fabric supported by a self-sustaining water-porous plastic support. An end of the fabric tube and its encased support are compressively received in the flared open end of an outlet connected to a conventional drainpipe. The outlet includes a plurality of projections which trap the fabric tube between the support and the outlet, so as to securely retain it therein. The outlet also preferably includes a plurality of circular beads over which a corrugated drain tube can be frictionally slipped. Alternatively, the outlet can be configured as a flat union or T-shaped junction joining one or more upstream fabric tube-and-support filters with a downstream outlet constructed from an identical fabric tube and support. The downstream outlet can also be in the form of a union for connecting two or more upstream fabric tube-and-support filters in addition to having means for connecting to a drainpipe or the like.

Abstract: An elastomeric sealing device to prevent ingress of surface fluids into holes, principally drains which are characterized by non-watertight covers or grilles with either regular or irregular topographic boundaries. The device comprises a three-part construction, including a top film, a core elastomer having minimal shear strength, and a bottom film. When in use, the device conforms to contour of adjacent hole covering device and fills existing crevices and voids, thereby providing an efficient seal. When removed from hole, device recovers neutral shape thereby being suitable for re-use on same or different hole.

Abstract: A one-piece slotted conduit having a thin inner body section and an encompassing frame structure. The encompassing frame structure having specially designed recesses formed in it to ensure maximum conduit strength and an economic use of material. The slotted conduit also including male/female interconnecting ends which ensure easy and accurate alignment of a plurality of conduits in an interconnected system.

Abstract: A method for inhibiting roadbed erosion and damage to roadways utilizes an underdrain system for removing water which causes such damage. Underdrains in the form of perforate pipes, preferably covered with a geotextile sock as a filter, are disposed transversely to the lengthwise direction of the roadway in close proximity to faults, cracks, joints and other fissures in the roadway. The underdrains conduct water away from such fissures thereby preventing roadbed particulate material from being pumped upwardly through the fissures together with water which collects below the concrete roadway. Such an installation is highly useful for preventing further damage to existing roadways, and may be installed without interrupting traffic or destroying the road surface by means of a pneumatic underground piercing tool.

Abstract: A vertical drainage element is constructed and laid in position while at the same time forming a narrow vertical channel in the ground by means of an excavating machine or trencher by performing the following successive operations:a strip of filtering material is unwound from a rotating roll of strip behind the trencher;the strip is introdued within the channel formed in the ground while being shaped in the form of a trough, the bottom of the trough being placed at the bottom of the channel while the side walls of the trough are placed against the channel walls;the top edges of the trough are held in position one against the other while filling the trough with bulk material in granular form which subsequently constitutes a vertical filtration block;the top edges of the trough of filtering material are closed on top of the completed block and are fastened together so as to form a closed jacket around the block.

Abstract: A drainage system located adjacent a pavement subbase includes a tube of a geotextile fabric supported by a self-sustaining water-porous plastic support. An end of the fabric tube and its encased support are compressively received in the flared open end of an outlet connected to a conventional drainpipe. The outlet includes a plurality of projections which trap the fabric tube between the support and the outlet, so as to securely retain it therein. The outlet also preferably includes a plurality of circular beads over which the corrugated drain tube can be frictionally slipped. Alternatively, the outlet can be configured as a flat union of T-shaped junction joining one or more upstream fabric tube-and-support filters with a downstream outlet constructed from an identical fabric tube and support.

Abstract: Landing deck for aircraft, in particular for helicopters, on seagoing vessels and offshore installations, such as platforms. When fuel is leaking from a helicopter after an accident, as for instance an unsuccessful landing, a fire often starts. In order to reduce the combustion intensity and the duration of such a fire continuous grooves or channels (8) are formed in beams of steel or metal, of which the deck is made, in the surface facing upwardly. Thereby fuel which has leaked out will be collected in the grooves or channels. The air supply to the grooves or channels is poorer than the air supply to fuel situated on decks without grooves or channels, and the combustion intensity, therefore, is reduced. Moreover, the combustion takes place on the surface of the liquid, and it is possible to drain a substantial part of the fuel without ignition thereof. Fuel may be collected from the grooves or channels by means of a collecting manifold or gutter.

Abstract: An apparatus and method for cutting grooves on the edges of an already formed road. Each of a plurality of toothed cutting wheels revolves about a substantially vertical driving shaft. Simultaneously, each cutting wheel (attached to a respective rotary shaft) revolves about its own longitudinal and substantially horizontal axis. The apparatus is moved along a road, near an edge thereof, thus giving rise to one linear motion and two rotary motions. Sequentially, each cutting wheel enters an edge of the road from a region beyond the road edge, due to a slight tilt of the plane which contains the cutting wheel rotary shafts. The resultant grooves are deepest at the road edges and then gradually diminish to zero depth, the grooves being arcuate and parallel to each other. With the plane containing the cutting wheel shafts completely horizontal, the apparatus can cut rain drainage grooves in a raised marking strip on the road or can remove bumps from the road.

Abstract: A device is provided for draining ground in depth. Each drain includes a tube having perforations in its middle part (1) with solid walls and closed at its lower part so as to form a cup (2), and with solid walls and open at its upper part (4). A siphoning tube (6) is permanently immersed by its lower part (3) in the cup (2), rises inside the tube (1) and leaves through a side duct (5) to drop down again towards an outlet (8). The outlet (8) is at the same level as the upper edge of the cup (2) so that the end (3) of the pipe (6) is always immersed and so that the siphon cannot be unprimed even during a dry period and requires no intervention.

Abstract: A drainage channel is shown which features a body having complementary ends which, in abutting relationship, form interlock with adjacent channel bodies when joining the channel bodies together; and an edge protective frame device for the upper free rims or edges of the channel side walls comprising a web resting on top of the channel side wall and two anchor legs extending downwards from and linked by the web and proceeding in the same direction and distance, at least one of which anchor legs is flush with its respective channel side wall and between the two of which legs the material of the upper part of the channel walls is formed; and a mounting leg for a channel cover, extending upwards from the outer edge of the web.

Abstract: A non-corrosive load transfer cell assembly for transverse joints in concrete pavement structures including support chairs, a pair of plastic walls abutting the edges of the concrete joints, a drainage trough for continuous drainage flow, a joint forming guide to wet form the upper portion of the joint through the concrete material, and compressed elastomers which space the wall liners apart and cooperate with threaded compression means to provide a load transfer supplement to steel dowels which pass through the elastomers.

Abstract: A slotted grate (2) is provided for being positioned in and covering the opening of the channel body (1) of a drainage channel. Anchor means are provided for detachably securing grate (2) to channel body (1) and include a bolt (4) rotatably mounted on grate (2) and having an end (14) extending into channel body (1). A locking strap (5) is carried transversely by bolt (4) for rotation within channel body (1) into and out of proximity to the walls (7,7') of channel body (1). Locking blocks (8, 8') are carried by walls (7,7') and secure locking strap (5) within locking blocks (8,8') upon rotation of locking strap (5) in one direction, and permit detachment of locking strap (5) upon rotation of locking block (5) in the other direction. Therefore, grate (2) can be easily and quickly secured to or detached from channel body (1), as desired.