The present disclosure pertains to a process for monitoring stress applied to a tendon by a hydraulic jack during tensioning of concrete. The process may include measuring an amount of hydraulic fluid that flows through the hydraulic jack during tensioning. The measured amount of hydraulic fluid is corelated with an amount of stress applied per unit of hydraulic fluid to determine a total amount of stress employed on the tendon. The process may also include measuring the distance of travel of the hydraulic piston. The measured travel can be used to calculated the distance the tendon has been pulled (elongation) as well as the stress applied to the tendon.
G01L 5/06 - Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using mechanical means
B66C 13/16 - Applications of indicating, registering, or weighing devices
G01G 19/16 - Weighing apparatus or methods adapted for special purposes not provided for in groups for weighing suspended loads having fluid weight-sensitive devices
G01L 5/08 - Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using fluid means
G01L 5/10 - Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
G01N 3/00 - Investigating strength properties of solid materials by application of mechanical stress
F15B 13/02 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
The present disclosure relates to stepped wedges that used with tendon anchors for maintaining tension on tension in post-tensioned concrete. Exemplary wedges include two halves. Each halve has a first end and a second end. The two halves are assembled to form a wedge having an outer diameter on the first end that is greater than the outer diameter of the second end. Internally, the wedge may have a constant inner diameter to retain a tendon. The inner surface of the wedge has a gripping surface. The wedge may have an external step that is circumferential around the wedge and results in a decrease from the outer diameter between the first and second ends.
The present disclosure relates to an improved hydraulic pump for maintaining acceptable operating temperatures for hydraulic fluid used in a post-tensioning jack system for post-tensioning concrete. Embodiments include a pump unit with a fan and a heat exchanger. The heat exchanger may be located directly below the motor for the pump and a fan unit; other embodiments include a heat exchanger may be located on a side of the pump with a co-located fan unit. The pump unit may be portable and battery powered. The pump unit may include a digital display for input and output of operating parameters.
Exemplary embodiments may include a lightweight post-tensioning jack that also maintains a gap in a resting position to avoid potential pinch hazards. The lightwweight post-tensioning jack may have dual-handlers. It may also include a tendon chuck that is capable of providing enough friction between the chuck and tendon to avoid slippage and tensioning inefficiencies. The chuck assembly may be moved using a slidable handle; that is, one of the dual handles may be fixed and other may be slidable to move the chuck.
Exemplary embodiments may include a lightweight post-tensioning jack that also maintains a gap in a resting position to avoid potential pinch hazards. The lightweight post-tensioning jack may have dual -handles. It may also include a tendon chuck that is capable of providing enough friction between the chuck and tendon to avoid slippage and tensioning inefficiencies. The chuck assembly may be moved using a slidable handle; that is, one of the dual handles may be fixed and the other may be slidable to move the chuck.
This application details a configuration for an in-line tendon shear, which may also be referred to as an in-line pocket shear. Exemplary embodiments may improve upon existing cutters and shears for tendons in post-tensioning operations by being advantageously more compact, efficient, can cut in multiple planes, such as horizontal and vertical planes, and may include additional other benefits. The in-line tendon shear has components that are aligned with a central axis of a tendon.
B23D 17/06 - Shearing machines or shearing devices cutting by blades pivoted on a single axis characterised by drives or gearings therefor actuated by fluid or gas pressure
The present application pertains to pre-tensioning machine for prestressing concrete. The machine includes a hydraulic circuit with a hydraulic pump and a hydraulic cylinder contained within a stanchion. The stanchion having a nose piece to fit around a tendon. The machine further includes an interface having a controller and a display. The machine may be coupled to a tendon and put tension on that tendon using the hydraulic cylinder as controlled at the interface by an operator.
E04G 21/12 - Mounting of reinforcing insertsPrestressing
B28B 23/04 - Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material wherein the elements are reinforcing members the elements being stressed
E04C 5/08 - Members specially adapted to be used in prestressed constructions
An apparatus may include a bracket having a post-tensioned cable tunnel and a pair of tabs configured to receive a post-tensioned cable and to prevent rotation of the bracket relative to the post-tensioned cable. An apparatus may include a plasma torch attachment member configured to releasably engage with the head of a plasma cutting torch of the type having a plasma cutting tip attached thereto, and to rotatably attach to the bracket such that the plasma cutting tip may be moved in an arc relative to the post-tensioned cable.
B23K 37/02 - Carriages for supporting the welding or cutting element
B23K 37/04 - Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work
A strand cutter includes a drive assembly and a clamp assembly. The strand cutter includes a nose piece. The nose piece includes a nose piece body, a shoulder, a fixed blade receptacle and a rotating blade receptacle. The strand cutter includes a fixed blade received in the fixed blade receptacle and a rotating blade assembly. The rotating blade assembly includes a cylindrical cutting body, a replaceable shear blade or a cutting edge, and a drive gear engagement coupled to or integrated with the cutting body. The drive gear engagement engages the drive assembly so as to allow the transmission of torque from the drive assembly to the blade mount, the blade mount coupled to or integrally formed with the cutting body. The strand cutter also includes a flange plate, wherein the flange plate receives the shoulder. The flange plate retains the nose piece in engagement to the drive assembly.
Concrete pre-tensioning systems comprised of machine chassis, hydraulic pumps, hydraulic jacks, electronic human-machine interface equipment for machines to input data and machine operating commands, and electronic control systems for machines
non-metallic post-tensioning construction components, namely, duct couplers for connecting two segments of sheath embedded inside a concrete structure which sheathing forms a void for installing and prestressing post-tensioning tendons after the concrete attains desired strength, excluding castings, panels, and trims
A strand cutter includes a drive assembly and a clamp assembly. The strand cutter includes a nose piece. The nose piece includes a nose piece body, a shoulder, a fixed blade receptacle and a rotating blade receptacle. The strand cutter includes a fixed blade received in the fixed blade receptacle and a rotating blade assembly. The rotating blade assembly includes a cylindrical cutting body, a replaceable shear blade or a cutting edge, and a drive gear engagement coupled to or integrated with the cutting body. The drive gear engagement engages the drive assembly so as to allow the transmission of torque from the drive assembly to the blade mount, the blade mount coupled to or integrally formed with the cutting body. The strand cutter also includes a flange plate, wherein the flange plate receives the shoulder. The flange plate retains the nose piece in engagement to the drive assembly.
06 - Common metals and ores; objects made of metal
07 - Machines and machine tools
08 - Hand tools and implements
19 - Non-metallic building materials
Goods & Services
construction materials in the nature of metal post-tensioning concrete components and equipment, namely, anchors, anchorage systems, strands, tendons, wedges, staplers, staples for construction or industrial use, extrusion lines, cutting lines, and fabrication lines; metal barrier cable systems and components, namely, anchors, inserts, wedges, rails, and swivels Power staplers; hydraulic stressing equipment, namely, stressing rams and power pumps all for use in post tensioning of concrete components hand tools, namely, sheathing strippers, plasma cutters, tendon cutters construction materials in the nature of non-metal post-tensioning concrete components and equipment, namely, chairs, bolsters, ducts, duct supports, duct couplers, sheathing, pocket formers, sand plates, extensions, shims, spacers, caps, round duct, flat duct, tight-radius duct, precast segmental duct couplers, composite precast concrete chairs, stack chairs, bar chairs, high chairs, single lock mesh chairs, single lock paving chairs, double lock paving chairs, double mat extensions, slab bolsters, beam bolsters, slab bolster uppers, cable end spacers, cable end protectors, and intersectional chairs
A barrier cable anchor rail assembly is disclosed. The assembly is adapted to be encapsulated in a concrete column and engage a plurality of cables to provide a barrier between successive columns of concrete. The assembly includes a first rail member and a plurality of threaded connectors. The threaded connectors are adapted to be engaged by a chuck that includes cable grippers adapted to engage one of the cables. The threaded connectors can be attached to the first rail member in the same orientation with a predetermined spacing between the central axis of the plurality of threaded connectors. The first rail member maintains the orientation and predetermined spacing of the threaded connectors and provides support to the concrete column in which it is encapsulated. A barrier cable assembly adapted to form a barrier between a first concrete column and a second concrete column is also disclosed.
A permanent stressed end cap for a post tensioned concrete member includes a grout retention feature adapted to retain a filler material within a void formed by a pocket former. The grout retention feature may be a generally knob or mushroom shaped, hex-headed, or square body extending from the cap. The grout retention feature may include one or more protrusions extending from the exterior of the cap. The grout retention feature may include one or more surface textures on the exterior of the cap.
E04B 1/16 - Structures made from masses, e.g. concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, sub-structures to be coated with load-bearing material
19.
Method of forming a post-tensioned concrete member utilizing a pocket former with keyway former
A pocket former includes a pocket former body and a keyway former. The pocket former is adapted to form a void in a concrete member allowing access to the stressing end of a post-tensioning tendon. The keyway former is adapted to form a keyway in the concrete to allow grout to be more securely retained in the void.
B28B 23/02 - Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material wherein the elements are reinforcing members
A barrier cable anchor rail assembly is disclosed. The assembly is adapted to be encapsulated in a concrete column and engage a plurality of cables to provide a barrier between successive columns of concrete. The assembly includes a first rail member and a plurality of threaded connectors. The threaded connectors are adapted to be engaged by a chuck that includes cable grippers adapted to engage one of the cables. The threaded connectors can be attached to the first rail member in the same orientation with a predetermined spacing between the central axis of the plurality of threaded connectors. The first rail member maintains the orientation and predetermined spacing of the threaded connectors and provides support to the concrete column in which it is encapsulated. A barrier cable assembly adapted to form a barrier between a first concrete column and a second concrete column is also disclosed.
Non-metallic construction components; components for use in reinforcing concrete building elements; non-metallic post-tensioning components for use in setting newly poured concrete including chairs, bolsters, ducts, duct supports, anchors and duct couplers.
Non-metallic construction components; corrosion protection components for use in reinforced concrete building elements; components for use in reinforcing concrete building elements; non-metallic post-tensioning construction components, including chairs, bolsters, ducts, seals for corrosion-protection tubes, duct supports, anchors, and duct couplers.
non-metallic post-tensioning construction components for use in setting newly poured concrete, namely, chairs, bolsters, ducts, duct supports, anchors, and duct couplers
non-metallic post-tensioning construction components for use in setting newly poured concrete, namely, chairs, bolsters, ducts, duct supports, anchors, and duct couplers
