US3701509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Splicing system and jack for stressing concrete
Assignee: Individual
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Filing: 1970-05-06
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Granted: 1972-10-31
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Expires: 1990-05-06
Abstract
Abstract A system and hydraulic jack are disclosed for stressing concrete structures with stranded steel cable. In one embodiment, a pocket is formed in a concrete slab with two pairs of stranded cables extending in opposite directions in the slab. Each pair of cables defines a plane that is perpendicular to the plane formed by the other cable pair. One pair of cables is passed in a first direction through apertures in a splice block and secured to it with conical grips. The other pair of cables is passed through the splice block and held releasably by a removable fitting. A hydraulic jack having first and second cylinder and piston rod units is then placed over the overlapped free ends of the cable pairs to force the temporary fitting away from the splice block and thereby tension the cable pairs against each other when the cylinder and piston rod units are expanded. The jack straddles the tensioned cables and is supported solely by the cables once suitable tension is achieved to bear the weight of the jack. A second pair of conical grips is located adjacent the splice block on the pair of cables held by the temporary fitting so that when the pressure is released in the jack, the second pair of grips are seated into the splice block to secure that cable pair and complete the stressing splice. Additional tension may be achieved by contracting the jack and taking a new grip on the free ends of the second pair of cables. Since the jack straddles the tensioned cables it is easily removed or placed into operative engagement with the cable pairs by lifting.
Inventors
- 👤 Frederick M Stinton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:28
CPC Classifications
E; E04; E04G; E04G21/00; E04G21/12; E04C; E04C5/00; E04C5/08; E04C5/12; E04C5/122; E04G21/121; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49874
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
250 words
A system for tensioning concrete structures comprising first and second sets of cables extending respectively in opposite directions within said structure and each cable having one end secured relative to said structure and a free end extending into a pocket in said structure, the free ends of each set overlapping in said pocket; a splice block defining a first set of apertures, each for receiving one of said first set of cables and a second set of apertures each having an expanding diameter and defining a tapered seating surface For receiving one of said second set of cables in its direction of expanding diameter; gripping means securing respectively the free ends of said first set of cables to said splice block; a set of tapered gripping means received on said second set of cables adjacent said splice block and adapted to be seated in an associated one of said tapered apertures therein; temporary fitting means for releasably holding the free ends of said second set of cables after passing through said splice block; and expandable hydraulic means for engaging said splice block and said temporary fitting means for urging the same apart to tension said sets of cables against each other whereby when said hydraulic means is contracted to release the tension on said temporary fitting means said tapered gripping means will be seated in said tapered apertures of splice block to secure said sets of cable together, and said hydraulic means and said temporary fitting means may be removed.
Claim 2
Independent Claim
250 words
A system for tensioning concrete structures comprising first and second sets of cables extending respectively in opposite directions within said structure and each cable having one end secured relative to said structure and a free end extending into a pocket in said structure, the free ends of each set overlapping in said pocket; a splice block defining a first set of apertures, each for receiving one of said first set of cables and a second set of apertures each having an expanding diameter and defining a tapered seating surface For receiving one of said second set of cables in its direction of expanding diameter; gripping means securing respectively the free ends of said first set of cables to said splice block; a set of tapered gripping means received on said second set of cables adjacent said splice block and adapted to be seated in an associated one of said tapered apertures therein; temporary fitting means for releasably holding the free ends of said second set of cables after passing through said splice block; and expandable hydraulic means for engaging said splice block and said temporary fitting means for urging the same apart to tension said sets of cables against each other whereby when said hydraulic means is contracted to release the tension on said temporary fitting means said tapered gripping means will be seated in said tapered apertures of splice block to secure said sets of cable together, and said hydraulic means and said temporary fitting means may be removed.
Claim 3
Dependent Claim
46 words
The system of claim 1 wherein said first and second sets of cables each comprise a pair of stranded steel cables and wherein the tapered seating surfaces of said second set of apertures of said splice block and said tapered gripping members are frusto-conical in shape.
Claim 4
Dependent Claim
81 words
The system of claim 1 wherein said first-named gripping means comprises a plurality of frusto-conical grip members, one for each of said first set of cables, and wherein said first set of apertures of said splice block comprises a plurality of frusto-conical seating surfaces each receiving one of said first set of cables in the direction of expanding diameter and adapted to receive one of said frusto-conical grip members for permanently securing said first set of cables to said splice block.
Claim 5
Dependent Claim
167 words
The system of claim 1 wherein said hydraulic means comprises first and second cylinder and piston rod units adapted to straddle said first and second sets of cables and to extend in the direction of elongation of said cables, first yoke frame means interconnecting the rods of said units and defining a throughway for fitting over and engaging at least one of said sets of cables, said first yoke frame means adapted to engage said splice block, second yoke frame means interconnecting said cylinders of said units and defining an aperture for receiving said sets of wires and engaging at least some of said second set, and bearing surface means for engaging said temporary fitting means, whereby when said units are expanded, said first yoke means will force said splice block relative to said temporary fitting means to tension all of said cables and at least some of said cables will engage their associated yoke means to lift said hydraulic means when said cables are under tension.
Claim 6
Dependent Claim
227 words
Apparatus for applying tension to first and second sets of spaced cables extending in opposite directions relative to each other with free ends overlapping, the free ends of one set of cables secured to a splice block, comprising: first and second cylinder and piston rod units adapted to straddle said sets of cables, first frame means fastened to the piston rods of said units to secure the same together, second frame means fastened to the cylinders of said units to secure the same together whereby said rods move in unison relative to said cylinders when said units are expanded, seating means connected to one of said frame means, said seating means having a surface formed and adapted for receiving said splice block in seating engagement, the other frame means providing a surface for engaging gripping means temporarily secured to said second set of cables, said first and second frame means being yokes defining throughways for said cables between said units, said throughways communicating with the exterior of the jack, said throughways defining spaced surfaces adapted to engage and rest upon at least two of said cables whereby said jack rests on and is supported by said cables when tensioned and it may be removed after said cables have been permanently fastened together by contracting and liFting the same transverse of the direction of elongation of said cables.
Claim 7
Dependent Claim
227 words
Apparatus for applying tension to first and second sets of spaced cables extending in opposite directions relative to each other with free ends overlapping, the free ends of one set of cables secured to a splice block, comprising: first and second cylinder and piston rod units adapted to straddle said sets of cables, first frame means fastened to the piston rods of said units to secure the same together, second frame means fastened to the cylinders of said units to secure the same together whereby said rods move in unison relative to said cylinders when said units are expanded, seating means connected to one of said frame means, said seating means having a surface formed and adapted for receiving said splice block in seating engagement, the other frame means providing a surface for engaging gripping means temporarily secured to said second set of cables, said first and second frame means being yokes defining throughways for said cables between said units, said throughways communicating with the exterior of the jack, said throughways defining spaced surfaces adapted to engage and rest upon at least two of said cables whereby said jack rests on and is supported by said cables when tensioned and it may be removed after said cables have been permanently fastened together by contracting and liFting the same transverse of the direction of elongation of said cables.
Claim 8
Dependent Claim
40 words
The apparatus of claim 5 wherein said one of said frame means includes means for engaging said splice block to limit motion of said one frame means relative to said splicing block along the direction of elongation of said cable.
Claim 9
Dependent Claim
50 words
The apparatus of claim 6 wherein said one of said frame means engaging said splice block further includes a vertical aperture communicating the upper side of said jack with said splice block for receiving an inclined tool to tap permanent gripping means into corresponding seating apertures of said splice block.
Claim 10
Dependent Claim
63 words
The apparatus of claim 5 wherein said sets of cables comprise a first pair of cables having centers de-fining a vertical plane and a second pair of cables having centers defining a horizontal plane, and wherein each of said throughways of said yoke frame means comprises a gen-erally vertical groove for receiving the uppermost of said pair of cables defining said vertical plane.
Claim 11
Dependent Claim
242 words
Apparatus for applying tension to first and second sets of cables extending in opposite directions in a concrete structure and secured at their respective remote ends to said structure and including free ends extending into a pocket in said structure in overlapping relation, the cables of each set being spaced from one another and the cables of each set defining a plane with the planes so defined intersecting one another, comprising: first and second cylinder and piston rod units extending in a direction of elongation of said cables when placed in operative relation relative to said cables and lying on either side of said cables when in said operative position; first yoke frame means interconnecting the rods of said units and adapted to fit over the tops of said cables and including an element formed and adapted to receive a splice block secured to one of said sets of cables; said element including a flange extending transversely to the axes of said cylinders, said flange being spaced from said first frame means to provide an abutment for the side of said splice block,and second yoke frame means interconnecting the cylinders of said units and adapted to receive all of said cables in a direction perpendicular to the direction of elongation of said cables, said second frame means providing a bearing surface for engaging a temporary fitting releasably secured to the other of said sets of cables and remotely located from said element.
Claim 12
Dependent Claim
242 words
Apparatus for applying tension to first and second sets of cables extending in opposite directions in a concrete structure and secured at their respective remote ends to said structure and including free ends extending into a pocket in said structure in overlapping relation, the cables of each set being spaced from one another and the cables of each set defining a plane with the planes so defined intersecting one another, comprising: first and second cylinder and piston rod units extending in a direction of elongation of said cables when placed in operative relation relative to said cables and lying on either side of said cables when in said operative position; first yoke frame means interconnecting the rods of said units and adapted to fit over the tops of said cables and including an element formed and adapted to receive a splice block secured to one of said sets of cables; said element including a flange extending transversely to the axes of said cylinders, said flange being spaced from said first frame means to provide an abutment for the side of said splice block,and second yoke frame means interconnecting the cylinders of said units and adapted to receive all of said cables in a direction perpendicular to the direction of elongation of said cables, said second frame means providing a bearing surface for engaging a temporary fitting releasably secured to the other of said sets of cables and remotely located from said element.
Claim 13
Independent Claim
210 words
A method of tensioning a concrete structure comprising forming said slab with an open pocket and first and second sets of cables extending into said pocket out of opposing surfaces of said pocket respectively, passing said first set of cables in a first direction through a first set of apertures in a splice block, passing said second set of cables in a direction opposite to said first direction through a second set of tapered apertures in said splice block in the direction of expanding diameter of said apertures, securing said first set of cables to said splice block, passing a tapered grip on each of said second set of cables adapted to be received in an associated one of said tapered apertures in said spice block, then forcing said second set of cables against said splice block by hydraulic means to pull said second pair of cables through said splice block thereby to tension all of said cables, then urging said tapered grips into contact with the seating surface of said second set of apertures, and then releasing the force exerted by said hydraulic means on said cables to thereby seat said tapered grips in their associated apertures and to connect all of said cables directly to said splice block.
Claim 14
Independent Claim
210 words
A method of tensioning a concrete structure comprising forming said slab with an open pocket and first and second sets of cables extending into said pocket out of opposing surfaces of said pocket respectively, passing said first set of cables in a first direction through a first set of apertures in a splice block, passing said second set of cables in a direction opposite to said first direction through a second set of tapered apertures in said splice block in the direction of expanding diameter of said apertures, securing said first set of cables to said splice block, passing a tapered grip on each of said second set of cables adapted to be received in an associated one of said tapered apertures in said spice block, then forcing said second set of cables against said splice block by hydraulic means to pull said second pair of cables through said splice block thereby to tension all of said cables, then urging said tapered grips into contact with the seating surface of said second set of apertures, and then releasing the force exerted by said hydraulic means on said cables to thereby seat said tapered grips in their associated apertures and to connect all of said cables directly to said splice block.
Claim 15
Dependent Claim
118 words
A fluid pressure operated jack assembly for applying tension to cables embedded in concrete including a pair of fluid cylinders, a first yoke spanning said cylinders and fixed thereto, a second yoke fixed to the piston rods of said cylinders, said yokes being formed and adapted to hold said cylinders in spaced, generally parallel relatIon, said first and second yokes having recesses formed therein to permit passage of cables through said yokes, the recess in each yoke providing spaced abutment surfaces extending generally parallel to the axes of said cylinders, and a cable receiving groove between said abutment surfaces, said abutment surfaces being spaced from said groove by additional surfaces extending between said abutment surfaces and said groove.
Claim 16
Dependent Claim
118 words
A fluid pressure operated jack assembly for applying tension to cables embedded in concrete including a pair of fluid cylinders, a first yoke spanning said cylinders and fixed thereto, a second yoke fixed to the piston rods of said cylinders, said yokes being formed and adapted to hold said cylinders in spaced, generally parallel relatIon, said first and second yokes having recesses formed therein to permit passage of cables through said yokes, the recess in each yoke providing spaced abutment surfaces extending generally parallel to the axes of said cylinders, and a cable receiving groove between said abutment surfaces, said abutment surfaces being spaced from said groove by additional surfaces extending between said abutment surfaces and said groove.
Claim 17
Dependent Claim
46 words
The structure of claim 11 wherein one of said yokes includes spaced fingers in the recess therein, the space between said fingers communicating with said groove, said fingers being spaced from said abutment surfaces to allow reception of cables between said fingers and said abutment surfaces.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |