Abstract: Apparatus for removing structural concrete comprises an elongated hood having an inner generally non-accessible zone, an outer zone accessible for performing maintenance functions and an elongated slot between the zones. A reciprocal feed carriage is guidably mounted within the hood in the inner zone and mounts a seal support housing within the outer zone. Portions of the housing extend through the slot into the inner zone and are pivotally mounted upon the carriage. A rotating shaft and seal assembly is mounted upon the seal support housing in the outer zone, including a body having a water inlet adapted for connection to a source of water under pressure. An elongated tubular shaft and nozzle assembly is axially connected to the rotatable seal and shaft assembly and extends from the seal support housing through the slot into the inner zone of the hood, through the carriage and into the bottom of the hood for directing water under pressure against the structural concrete.

Abstract: A scarifier suspended beneath the body of an automotive vehicle such that it is vertically movable by means of cylinders. It comprises a suspending frame provided on a main frame vertically movable by means of the cylinders so that it may be freely slidable in the widthwise direction of the vehicle body, a plurality of supporting bars horizontally disposed within the suspending frame so that they may extend in the longitudinal direction of the suspending frame and so that any two adjacent bars may be connected in series to each other by means of a pin, said supporting bars being each connected to a cylinder vertically provided on the suspending frame so that each bar may be inclined in the longitudinal direction, and a multiplicity of claws provided, at prescribed intervals, on the supporting bars by way of pins in such a manner that they extend downwards from the pins and that they are swingable about the pins.

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: A method and apparatus for renewing the surface of asphaltic paving at low cost and for immediate reuse. The asphalt surface is heated to about 300.degree.-500.degree. F. The surface is broken to a depth of about two inches and the lower material thoroughly mixed in situ with the broken surface material. After mixing, the material is further heated to fuse the heated mixture into a homogeneous surface. The surface is screeded for leveling and compacted by a road roller. A road machine is disclosed having a steam manifold for heating the asphalt, transversely reciprocating breaker bars having teeth adjusted to the depth desired, toothed mixing cylinders for mixing the broken material, and a second steam manifold for reheating the mixed material. Reciprocating screed bars on the road machine level the mixed and heated material. Final compacting may be done with a conventional road roller.

Abstract: A paving stone set includes a square paving-stone, a larger rectangular paving-stone and a smaller rectangular paving-stone. Each of the paving stones has generally planar top and bottom surfaces and generally planar side walls, with a clothoid shaped surface being formed on two corners of each paving-stone. The radius of curvature of each clothoid shaped surface may be different from that of the other clothoid shaped surfaces on each paving-stone. The top surface may have a different color and texture than the bottom surface. The paving-stones may be irregularly broken surfaces.

Abstract: A collapsible warning barricade apparatus for restricting access to a designated area by vehicular and pedestrian traffic in which at least an upstanding portion of the apparatus is capable of collapsing towards a substantially ground surface-hugging position upon impact from traffic, as well as capable of collapsing into a substantially flat position for transportaion and/or storage. The barricade is restrained in its substantially upright position by two support runners which are pivotally attached to the barricade member. At each pivot point, automatic locking and biasing apparatus allow the barricade member to rotate from a locked upright position upon impact to a locked ground surface-hugging position. The support runners of the barricade may additionally be provided with spurs along the top edge to affix a sandbag, when required for ballast. A variety of signalling indicia are further integrated into the barricade member for warning emphasis.

Abstract: A warning system for multi-lane roadways comprising a group of strips placed longitudinally across only the left-most lane of the roadway as referenced by a person facing in the designated direction of traffic flow.

Abstract: A self propelled construction apparatus for continuously forming a paving material on a suitable surface such as the ground. The apparatus is capable of performing a variety of molding operations. The main frame of the apparatus is so constructed as to be adjustably extended outwardly longitudinally for wide width paving. Also, the apparatus can be laterally adjusted to perform narrow width paving. The apparatus may have an offset mold on either side thereof for offset molding or a mold underneath the main frame for molding between the ground engaging means. Further, means for mounting and connecting the mold to the main frame allows the mold to be moved angularly on a vertical axis from an operative position alongside the main frame to a transport position at the end of the substantially aligned with the main frame.

Abstract: A selectively positionable extension for an elevated walkway includes a planar ramp mounted by rollers to a frame and coupled to the frame by a selectively extensible hydraulic ram. The frame itself is supported by a second ramp for controlled vertical positioning. A pair of handrail gates are pivotally mounted on the ramp frame at opposed lateral sides thereof, and engage guide channels in the ramp side edges for automatically opening and closing the handrail gates as the ramp is extended from and retracted into the frame. The guide channels are so constructed that the handrail gates open and close from overlapping positions without interference. The entire extension is provided as a modular assembly which may be readily incorporated into existing or new walkway constructions.

Abstract: Each of the recessed, confronting edges of adjacent concrete slabs in a roadway or the like has secured therein by a high density reinforced grout an elongated, rigid, prefabricated or precast edger strip, which also has an elongate recess in the edge thereof which faces on the space between the slabs. An elongate, semi-rigid, prefabricated cover member, which is generally T-shaped in cross section, has its upper, plate-shaped section positioned over the upper end of the space between the slabs so that opposite sides thereof project part way into the recesses in the edger strips, and has its downwardly projecting web section embedded in a sealing compound positioned between the confronting ends of the slabs. Remaining portions of the recesses in said edger strips are filled with a low modulus urethane compound.

Abstract: The invention here disclosed comprises a method and apparatus for rejuvenating an asphalt roadway surface resulting in up to approximately three inches of new repaved roadway surface produced at speeds of up to approximately twenty-two feet per minute. The method includes the steps of heating a top layer of roadway, scarifying that heated layer, adding a recycling agent and thoroughly mixing and screeding the road surface to form a recycled material, adding new asphalt mix to the recycled material and milling the combination to form a mixed material and leaving a sub-layer plane in the roadbed. The mixed material is next conveyed away to a paving station located at the end of the process. During this conveying, the sub-layer left by the milling cut is heated, scarified, treated and worked in a manner similar to the treatment performed on the top layer of road surface.

Abstract: A directional control mechanism for a surface working machine. The surface working machine includes a frame that carries at least a pair of rotors each having a vertical rotatable shaft. Surface working means, including a plurality of radially extending blades, is operably connected to the shaft and rotates therewith. Each blade is mounted for tilting movement with respect to the rotor shaft about a horizontal axis and by simultaneously tilting the blades about the respective horizontal axes, the pitch of the blades can be varied. In addition, a second operating mechanism is included for individually tilting the blades of each rotor as the rotor rotates to effect directional control of the machine.

Abstract: A cutter (10) intended for use on a planing blade on a road planing machine is provided with a plurality of tools (14) rotatably mounted in the cutter. The tools (14) are mounted side by side and are adapted to carry out the working of the road surface (17).

Abstract: An apparatus and method for drilling and then installing a production conduit (46) within an enlarged bore hole (D) along an underground path (P) between two surface locations (C, D). Upon completion of a pilot bore hole (B), a reamer (48) enlarges the bore hold (B). The drill string (10) is returned to the exit opening (E) for connection to the production conduit (46) for pulling the conduit (46) within the enlarged opening (D). One embodiment (FIGS. 19-21) utilizes canted rollers (168) for supporting the production conduit (46) at the exit opening (E) and effecting rotation thereof as the production conduit (46) is fed into the enlarged diameter opening (D).

Abstract: Disclosed is a road surface heating vehicle as well as a gas supply system therefor. The vehicle is provided with heating panels and a gas tank. It further comprises a plurality of vaporizers connected in parallel to each other by a gas line and a liquid line. The gas line is connected to the heating panels via its branch lines. The gas and liquid lines are each mounted with a solenoid valve and a pressure adjusting valve. The gas tank is equipped with necessary instruments involved, the vehicle having a body equipped with an operating board containing a microcomputer which automatically makes its control operation based on the use of the associated members, in such a way as to keep the gaseous pressure to fall within a specified range of levels. The system comprises members corresponding to the above-mentioned members constituting the vehicle, including a microcomputer adapted to automatically control the gaseous pressure so that the same may be kept within a specified range of levels.

Abstract: Disclosed is a road surface layer reproducing apparatus which comprises a mixture hopper, a scarifier, and a mixer means including a first mixer of single-shaft rotor system and a second mixer of twin-shaft rotor system.This apparatus is characteristic of a mixture hopper swingable laterally around its hopper supporting shaft, a sacrifier whose claws are so loosely fitted that the tip ends of the claws can follow up the contour of a road being remedied, a first mixer provided with a single-shaft rotor with a depth-measuring device for controlling the depth of penetration of the rotor into the asphalt of the road and mounted with screws for forming a windrow of an asphalt mixture to the center of the main body of the apparatus and a second mixer provided with parallel mounted twin-rotors which is vertically movable by a three-point supporting mechanism.

Abstract: A method of converting a conventional grid deck to an exodermic deck is disclosed. The method includes the steps of removing existing concrete if the deck is a filled grid. Tertiary load bearing bars are placed on top of the grating parallel to and between the primary load bearing bars. Shear members are vertically mounted on the tertiary load bearing bars to provide structural integrity. The interstices of the grating are filled to prevent concrete from penetrating the grating. A concrete overlay is poured and cured on the top surface of the grating and the interstice filling is removed.

Abstract: A terrorist vehicle barrier is disclosed that is an improvement on the barrier shown in U.S. Pat. No. 4,576,507. The barrier consists of two vertical I-beams having cable passed between them to provide a barrier. An expanded aluminum honeycomb is provided between the I-beam and the cable passing around the I-beam to provide an effective shock absorbing structure. The barrier can be employed as an actuatable gate or as a fence-like structure around the perimeter of a installation to provide an esthetic and cost effective barrier strong enough to stop a high speed vehicle with minimum damage to the barrier.

Abstract: A portable foldable ramp for bridging the space between ground level and a raised level such as the bed of a pickup truck, to permit the passage of the wheels of all-terrain vehicles and like products. The ramp has a pair of generally U-shaped ramp sections hingedly connected in end-to-end alignment so as to be foldable to coextensive bottom-to-bottom abutment for ease of transport. A somewhat stiff, flexible cable has its ends connected to the remote ends of the bottoms of the ramp sections to support the load. The cable is guided when the ramp sections are folded to dispose it in looped configuration within the confines of the coextensive ramp sections which intermesh when the ramp sections are folded.

Abstract: Apparatus for reworking pavement expansion joints by resizing the joint includes a frame having front and rear portions hinged to one another at a transverse pivot axis. The frame pushed along the pavement by a vehicle. The rear frame portion is supported by laterally positioned wheels and by a rear guide disk. The front frame portion is supported by a front guide disk. The guide disks lie along the frame axis and engage the expansion joint to guide the frame along the joint. A concrete cutting saw is mounted to the rear frame portion directly above the axis of the support wheels with its saw blade lying in the same vertical plane as the guide disks. The saw is preferably remotely raised and lowerd through actuation of a hydraulic cylinder mounted to the frame to adjust the depth of cut. The frame is pushed through a link drive having dual axis joints for attachment to the vehicle and the frame.