CN101761236B

CN101761236B - Structure for post-tensioning prestressed steel withdrawing from tension in advance and method thereof

Info

Publication number: CN101761236B
Application number: CN2009102602654A
Authority: CN
Inventors: 赵正义
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-12-28
Filing date: 2009-12-28
Publication date: 2011-06-01
Anticipated expiration: 2029-12-28
Also published as: CN101761236A

Abstract

A structure for post-tensioning prestressed steel withdrawing from tension in advance and a method thereof consist of both fixed end structures which can be installed and dismantled repeatedly and structures for pre-withdrawing from tension. The structure ensures that the material elongation formed during decreasing tensile values of the prestressed steel before final withdrawal from tension to residual tensile strength values can guarantee successful withdrawal from tension. The structure not only aims to fully utilize material properties, reduce usage amount of prestressed steel, and lessen structure specifications of the whole structure system comprising tension ends, fixed ends and prestressed steel channels, but also avoids incapability of repeatedly using and soundly withdrawing from tension caused by reaching limits of the working pulling force of the prestressed steel, providing new technology for saving resources and lowering cost of cycle-movement of used precast concrete components and the decomposed post-tensioning prestressing structure system.

Description

The structure of post-tensioning prestressed steel withdrawing from tension in advance and method

The back sheet structural system of the no bonded post tensioning method prestressed reinforcement of the concrete prefabricated parts structure that technical field the present invention relates to cycle combination, decompose.

Background technology is present, move the plant equipment of use (as building tower crane in order to reach the cycle, the wireless signal tower, the oil production machine of oil, wind-driven generator, the exploration machine etc. in ore deposit, ground) the prestressed constructions system of the concrete prefabricated parts of combination foundation repeatedly back sheet make the reusable purpose of prestressed reinforcement, the prestressed reinforcement pulling force design load of no bonded post tensioning method only is about 40% of its tensile strength standard value, the Intensity Design value of this Intensity Design value and regulation and stipulation is 70% difference that still has about 30% of its strength standard value, and this is in order to realize that prestressed reinforcement can be repeatedly used to reach economical with materials, another kind of considerable resource and cost waste that the purpose technical measures that reduce cost cause.And the back sheet method of existing prestressed reinforcement and construction measure can't be implemented in the nothing damage back sheet that utilizes realization prestressed reinforcement under the condition that guarantees the reusable mechaanical property of materials of prestressed reinforcement in remaining strength standard value (70～100%) scope.Its state of the art is, realize reusable needs for intact back sheet and reduce the pulling force design load of prestressed reinforcement, causing increases the prestressed reinforcement consumption, the comprehensive waste that the corresponding increase of the chain structure that causes its whole structural system to comprise stretch-draw end, fixed end and reinforcing bar duct of the increase of amount of reinforcement forms; The Intensity Design value of prestressed reinforcement is used the limit of regulation, and causing the back sheet of prestressed reinforcement to destroy can only be disposable waste; The both can't avoid material and cost waste.

Summary of the invention the object of the invention: purpose of the present invention and task provide a kind of structural system that reaches under its tensile strength design load condition the back sheet of can be before final back sheet dismounting anchoring intermediate plate prestressed reinforcement being gone ahead of the rest at prestressed reinforcement, making the value of thrust of prestressed reinforcement before final back sheet be reduced to the formed material elongation of its remaining tensile strength values in advance is enough to finish smoothly back sheet dismounting anchoring intermediate plate, and prestressed reinforcement and ground tackle are thoroughly decomposed.Like this, both can use up the strength design standard value of prestressed reinforcement, improve material functional performance to 70%, thereby reduce the consumption of prestressed reinforcement, reduce the structure specification that whole structural system comprises fixed end, stretch-draw end and prestressed reinforcement duct simultaneously; The limit that can avoid again using regulation because of the value of thrust of prestressed reinforcement can't realize its repeated use by intact back sheet.For the resources conservation of the no bonded post tensioning method prestressed constructions system that further realizes being used for the concrete prefabricated parts combination, decompose with reduce cost new technical condition are provided.

Technical scheme the present invention includes by prestressed reinforcement with reduce prestressed fixed end structure, withdrawing from tension in advance structure before ground tackle thoroughly separates in advance and increase the fixed end structure that prestressed reinforcement is reused the no bonded post tensioning method prestressed reinforcement that the structure of number of times constitutes jointly.

Fixed end and increase prestressed reinforcement are reused the structure of number of times: the outer end of the steel strand duct end pipe (7) of steel strand duct (14) and the outer facade confluce of concrete prefabricated parts (1) have circular hole and steel strand duct end pipe (7) to enclose (2) with the termination, steel strand duct of internal diameter, termination, steel strand duct circle (2) is that section is arranged is the annular groove of rectangle its export-oriented face inboard of circle of rectangle for section, and the export-oriented face of termination, steel strand duct circle (2) is equal with the outer facade of concrete prefabricated parts (1); The outside of termination, steel strand duct circle (2) is provided with and No. 1, the pressure-bearing circle (3) of termination, steel strand duct circle (2) with internal diameter, on its export-oriented face of circle that pressure-bearing circle No. 1 (3) is rectangle for section section being arranged is the annular groove (33) of rectangle, to the face inboard section being arranged in it is that the convex annular key of rectangle cooperates with the annular groove that the export-oriented face inboard of (2) is enclosed in termination, steel strand duct, and the outer diametric plane of pressure-bearing circle No. 1 (3) is provided with external screw thread; The outside of pressure-bearing circle No. 1 (3) is provided with No. 1, pressure-bearing pipe (4), pressure-bearing pipe No. 1 (4) and No. 1 (3) same internal diameter of pressure-bearing circle, the inner termination of pressure-bearing pipe No. 1 (4) are provided with pressure-bearing pipe No. 1 (4) and match with external diameter and the internal diameter annular groove (33) less than the export-oriented face of annular protruding key No. 1 (34) and pressure-bearing circle No. 1 (3) of No. 1 (4) internal diameter of pressure-bearing pipe; The external end head of pressure-bearing pipe No. 1 (4) be provided with pressure-bearing pipe No. 1 (4) with internal diameter and external diameter No. 2, convex annular key (35) less than No. 1 (4) external diameter of pressure-bearing pipe, the length of pressure-bearing pipe No. 1 (4) is greater than the distance between protruding key of suspension member (18) and the cuff block piece (17); The number of packages that the outside of pressure-bearing pipe No. 1 (4) is provided with and equal in length identical with No. 1 (4) inside and outside footpath of pressure-bearing pipe is pressure-bearing pipe No. 3 (13) and 2 No. 2, pressure-bearing pipes (5) more than or equal to 1 integer; The inner termination of every pressure-bearing pipe No. 3 (13) or pressure-bearing pipe No. 2 (5) is provided with the outer ring protruding key identical with the convex annular key of pressure-bearing pipe No. 1 (4) No. 1 (34) and is provided with and No. 2 (35) identical interior convex annular keys of convex annular key at external end head, and the interior convex annular key No. 2 (35) of the external end head of the protruding key of outer ring of the inner termination of every pressure-bearing pipe No. 3 (13) or pressure-bearing pipe No. 2 (5) No. 1 (34) and adjacent pressure-bearing pipe No. 3 (13) or pressure-bearing pipe No. 2 (5) does not have the gap mutually and cooperates; The inside and outside footpath of pressure-bearing pipe No. 2 (5) and two ends structure is identical with pressure-bearing pipe No. 1 (4) with pressure-bearing pipe No. 3 (13), and with the plane tangent line of the vertical diameter by pressure-bearing pipe No. 3 (13) pressure-bearing pipe No. 3 (13) being divided equally is No. 2,2 pressure-bearing pipes (5); The outside at the pressure-bearing pipe of being located at outermost end No. 3 (13) or pressure-bearing pipe No. 2 (5) or pressure-bearing pipe No. 1 (4) is provided with the steel strand location-plate (10) that is shaped as cylinder or prism, the interior inboard to the plane of steel strand location-plate (10) is provided with the annular bearing pipe detent (36) that matches with the inner convex annular key in outer end of pressure-bearing pipe No. 1 (4) or pressure-bearing pipe No. 2 (5) or pressure-bearing pipe No. 3 (13) No. 2 (35), be provided with the groove (11) that cooperates with the protruding key of suspension member (18) in the outside of annular bearing pipe detent (36), the limit number of the crossing regular polygon that forms of the longitudinal axis of groove (11) is 3 integer multiple; The external diameter of steel strand location-plate (10) is smaller or equal to the external diameter of pressure-bearing circle No. 1 (3), y direction at steel strand location-plate (10) upper edge steel strand location-plate (10) is provided with steel strand hole (12), is provided with external diameter at the external end head of the steel strand that pass steel strand hole (12) (8) and is connected with steel strand (8) greater than the steel strand anchor head (9) of steel strand hole (12); As shown in Figure 1.

The withdrawing from tension in advance of steel strand (8) structure: section is that the interior of pressure-bearing circle No. 2 (6) do not have the gap after the external screw thread of internal thread and pressure-bearing circle No. 1 (3) of the pressure-bearing circle No. 2 (6) of rectangle cooperated between the outerplanar of plane and concrete prefabricated parts (1); Be provided with on the export-oriented plane of pressure-bearing circle No. 2 (6) 3 its outer ends with pressure-bearing circle No. 1 (3) the same plane vertical with the axle center of steel strand location-plate (10) on supporting rod (19), the outerplanar of the longitudinal axis of supporting rod (19) and pressure-bearing circle No. 1 (3) is vertical, and the distance of adjacent supports rod member (19) equates; Be provided with profile and endoporus in the outside of the outer transverse plane of supporting rod (19) and be circular or polygonal circle or plane jack base (20) for circular or polygonal plate, the longitudinal axis of jack base (20) overlaps with the longitudinal axis of steel strand location-plate (10), and the interior of jack base (20) is connected to the outer face of plane with supporting rod (19); The interior distance to plane and steel strand (8) termination of jack base (20) is greater than the length of convex annular key No. 1 (34) or convex annular key No. 2 (35), and the export-oriented plane of jack base (20) is provided with internal diameter and jack cylinder (21) bottom cylindrical cooperates and positioning pipe (28) concentricity with jack base (20) and that be connected; In the outside of the outer face of jack piston (22) is provided with to plane and jack piston (22) pushing tow pressure part (24) with diameter, the export-oriented face center of pushing tow pressure part (24) is provided with the protruding key of hemispherical (30), the interior of pushing tow pressure part (24) cooperates to the export-oriented face of face with jack piston (22), with the pushing tow pressure part positioning pipe (23) that is connected with pushing tow pressure part (24) pushing tow pressure part (24) and jack piston (22) location cooperated; Supporting member No. 1 (25) is circle or polygon steel plate, the inner face of supporting member No. 1 (25) is provided with the spherical segment groove (31) that cooperates with the protruding key of hemispherical (30) with concentric its internal diameter of No. 1 (25) plane of supporting member centre of form, and the degree of depth of spherical segment groove (31) is less than the radius of the protruding key of hemispherical (30); Establishing the section identical with supporting rod (19) number of packages along the excircle of supporting member No. 1 (25) is the horizontal suspension member (15) of J-shaped, the inner inboard protruding key of suspension member (18) that is positioned at horizontal suspension member (15) matches with the groove (11) of the inner side plane outside of steel strand location-plate (10) and makes horizontal suspension member (15) location, is positioned at cuff block piece (17) the location cuff (16) in the inner outside of horizontal suspension member (15); There is the pin shaft hole (27) that supplies bolt or bearing pin (26) to pass the outer end of horizontal suspension member (15), the centre distance of the longitudinal axis of bolt or bearing pin (26) and supporting member No. 1 (25) equate and the radius of the mid point and supporting member No. 1 (25) of bolt or bearing pin (26) vertical, the plane that the longitudinal axis of bolt or bearing pin (26) forms and the plane parallel of supporting member No. 1 (25); The two ends of bolt or bearing pin (26) are passed from outrigger (29) and the pin shaft hole (27) that bolt or bearing pin (26) external diameter cooperate that is connected with No. 1 (25) outer rim of supporting member, outrigger (29) is connected by bolt or bearing pin (26) with horizontal suspension member (15) and horizontal suspension member (15) can be rotated freely along the axle center of bolt or bearing pin (26); Pressure-bearing circle No. 2 (6) and supporting rod (19) and jack base (20) and positioning pipe (28) are combined into withdrawing from tension in advance bearing (37); Jack cylinder (21) and jack piston (22) are combined into jack (38); Supporting member No. 1 (25), pushing tow pressure part positioning pipe (23), pushing tow pressure part (24) and horizontal suspension member (15), outrigger (29), bolt or bearing pin (26) are together to form withdrawing from tension in advance yoke frame combination (39); Or be that three fork-shapeds, section that angle equates are No. 2 No. 1, (40) replacement support of supporting member (25) that the steel section bar of rectangle or circle or H shape is connected and forms with the plane projection, at the interior spherical segment groove (31) that cooperates with the protruding key of hemispherical (30) that is provided with to the face center of supporting member No. 2 (40); Shown in Fig. 1,2,3,4,5.

Beneficial effect the present invention adopts a kind of structural system and matching method that reaches under its tensile strength design load condition the preliminary back sheet of can be before final back sheet dismounting intermediate plate prestressed reinforcement being gone ahead of the rest at prestressed reinforcement, make the value of thrust of prestressed reinforcement before final back sheet be reduced to its remaining tensile strength values and guarantee that the difference formed material elongation of steel strand between can reusable ultimate tension value is enough to smooth back sheet and dismantles intermediate plate, prestressed reinforcement and ground tackle are thoroughly decomposed.Like this, both can make full use of the strength design standard value of prestressed reinforcement, use up material property, reduce the consumption of prestressed reinforcement, reduce the structure specification that whole structural system comprises stretch-draw end, fixed end and prestressed reinforcement duct simultaneously; Can avoid again because of the value of thrust of prestressed reinforcement use the limit of regulation can't intact back sheet to realize its reusable situation.Realized that the material property utilization maximization of no bonded post tensioning method prestressed constructions system, concrete prefabricated parts combination foundation and other all suitable structures of plant equipment that the cycle is moved use further save the money consumption reduction.

The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments for description of drawings.

The C-C sectional drawing of the fixed end of the structure of Fig. 1---post-tensioning prestressed steel withdrawing from tension in advance and withdrawing from tension in advance structure

The A-A elevation of the structure of Fig. 2---post-tensioning prestressed steel withdrawing from tension in advance

The B-B sectional drawing of the structure of Fig. 3---post-tensioning prestressed steel withdrawing from tension in advance

No. 2 (40) elevation of the supporting member of the structure of Fig. 4---post-tensioning prestressed steel withdrawing from tension in advance

No. 2 (40) sectional drawings of the supporting member of the structure of Fig. 5---post-tensioning prestressed steel withdrawing from tension in advance

The specific embodiment is made and is installed shown in Fig. 1,2,3,4,5 the post-tensioning unbounded prestress reinforcing bar carried out the withdrawing from tension in advance of partial prestressing before final back sheet structure.

The operation sequence of Fig. 1,2,3,4,5 described withdrawing from tension in advance structure: 1. the external screw thread of the internal thread of the pressure-bearing circle of withdrawing from tension in advance bearing 37 No. 26 and pressure-bearing circle No. 13 is cooperated the no gap of realization between the outerplanar that rotates the inner plane that makes pressure-bearing circle No. 26 and concrete prefabricated parts 1; 2. the bottom of the jack cylinder 21 of jack 38 is cooperated with positioning pipe 28 to make between jack cylinder 21 and the jack base 20 and do not have the gap; Connecting air pump makes jack piston 22 extension elongations more than or equal to pressure-bearing pipe No. 3 13 or No. 25 length of pressure-bearing pipe of 1.5 times; 3. withdrawing from tension in advance yoke frame combination 39 is installed makes the protruding key 30 of hemispherical cooperate with spherical segment groove 31; 4. rotate the protruding key 18 of suspension member that each horizontal suspension member 15 makes its lower end and cooperate the location, cuff 16 is installed is then made each horizontal suspension member 15 location with groove 11; 5. operating jack 38 makes it that condition that outside pushing tows displacement of steel strand location-plate 10 reaches dismounting pressure-bearing pipe No. 25 is stopped pushing tow, dismounting pressure-bearing pipe No. 25; 6. reverse operating jack 38 makes between each pressure-bearing pipe No. 3 13, matches between pressure-bearing pipe No. 3 13 and the pressure-bearing pipe No. 14 and the inside and outside groove of steel strand location-plate 10 and pressure-bearing circle No. 13 matches; 7. continue reverse operating jack 38, protruding key 18 of the suspension member of each horizontal suspension member 15 and groove 11 are broken away from after, remove withdrawing from tension in advance yoke frame combination 39; 8. remove jack 38; 9. remove withdrawing from tension in advance bearing 37; 10. with the stretch-draw machine at the stretch-draw end to steel strand 8 back sheets;

Extract steel strand 8 out from fixed end, shed steel strand location-plate 10 and pressure-bearing pipe No. 3 13, pressure-bearing pipe No. 14, pressure-bearing circle No. 13 then;

Be to increase steel strand 8 and reuse number of times, many pressure-bearing pipes No. 3 13 are set, subtract when whenever reaching reusable number of times and adorn 1 pressure-bearing pipe and get final product for No. 3 13 at the fixed end that steel strand 8 are installed.

Claims

1. the structure of a post-tensioning prestressed steel withdrawing from tension in advance, the fixed end structure that comprises no bonded post tensioning method prestressed reinforcement, described fixed end structure by prestressed reinforcement with reduce the withdrawing from tension in advance structure of prestressed fixed end structure, steel strand before ground tackle thoroughly separates in advance and increase prestressed reinforcement to reuse the structure of number of times and constitute jointly, it is characterized in that:

Prestressed reinforcement with reduce prestressed fixed end structure before ground tackle thoroughly separates in advance and increase the structure that prestressed reinforcement is reused number of times: the outer end of the steel strand duct end pipe (7) of steel strand duct (14) and the outer facade confluce of concrete prefabricated parts (1) have circular hole and steel strand duct end pipe (7) to enclose (2) with the termination, steel strand duct of internal diameter, termination, steel strand duct circle (2) is that section is arranged is the annular groove of rectangle its export-oriented face inboard of circle of rectangle for section, and the export-oriented face of termination, steel strand duct circle (2) is equal with the outer facade of concrete prefabricated parts (1); The outside of termination, steel strand duct circle (2) is provided with and No. 1, the pressure-bearing circle (3) of termination, steel strand duct circle (2) with internal diameter, on its export-oriented face of circle that pressure-bearing circle No. 1 (3) is rectangle for section section being arranged is the annular groove (33) of rectangle, to the face inboard section being arranged in it is that the convex annular key of rectangle cooperates with the annular groove that the export-oriented face inboard of (2) is enclosed in termination, steel strand duct, and the outer diametric plane of pressure-bearing circle No. 1 (3) is provided with external screw thread; The outside of pressure-bearing circle No. 1 (3) is provided with No. 1, pressure-bearing pipe (4), pressure-bearing pipe No. 1 (4) and No. 1 (3) same internal diameter of pressure-bearing circle, the inner termination of pressure-bearing pipe No. 1 (4) are provided with pressure-bearing pipe No. 1 (4) and match with external diameter and the internal diameter annular groove (33) less than the export-oriented face of annular protruding key No. 1 (34) and pressure-bearing circle No. 1 (3) of No. 1 (4) internal diameter of pressure-bearing pipe; The external end head of pressure-bearing pipe No. 1 (4) be provided with pressure-bearing pipe No. 1 (4) with internal diameter and external diameter No. 2, convex annular key (35) less than No. 1 (4) external diameter of pressure-bearing pipe, the length of pressure-bearing pipe No. 1 (4) is greater than the distance between protruding key of suspension member (18) and the cuff block piece (17); The number of packages that the outside of pressure-bearing pipe No. 1 (4) is provided with and equal in length identical with No. 1 (4) inside and outside footpath of pressure-bearing pipe is pressure-bearing pipe No. 3 (13) and 2 No. 2, pressure-bearing pipes (5) more than or equal to 1 integer; The inner termination of every pressure-bearing pipe No. 3 (13) or pressure-bearing pipe No. 2 (5) is provided with the outer ring protruding key identical with the convex annular key of pressure-bearing pipe No. 1 (4) No. 1 (34) and is provided with and No. 2 (35) identical interior convex annular keys of convex annular key at external end head, and the interior convex annular key No. 2 (35) of the external end head of the protruding key of outer ring of the inner termination of every pressure-bearing pipe No. 3 (13) or pressure-bearing pipe No. 2 (5) No. 1 (34) and adjacent pressure-bearing pipe No. 3 (13) or pressure-bearing pipe No. 2 (5) does not have the gap mutually and cooperates; The inside and outside footpath of pressure-bearing pipe No. 2 (5) and two ends structure is identical with pressure-bearing pipe No. 1 (4) with pressure-bearing pipe No. 3 (13), and with the plane tangent line of the vertical diameter by pressure-bearing pipe No. 3 (13) pressure-bearing pipe No. 3 (13) being divided equally is No. 2,2 pressure-bearing pipes (5); The outside at the pressure-bearing pipe of being located at outermost end No. 3 (13) or pressure-bearing pipe No. 2 (5) or pressure-bearing pipe No. 1 (4) is provided with the steel strand location-plate (10) that is shaped as cylinder or prism, the interior inboard to the plane of steel strand location-plate (10) is provided with the annular bearing pipe detent (36) that matches with the inner convex annular key in outer end of pressure-bearing pipe No. 1 (4) or pressure-bearing pipe No. 2 (5) or pressure-bearing pipe No. 3 (13) No. 2 (35), be provided with the groove (11) that cooperates with the protruding key of suspension member (18) in the outside of annular bearing pipe detent (36), the limit number of the crossing regular polygon that forms of the longitudinal axis of groove (11) is 3 integer multiple; The external diameter of steel strand location-plate (10) is smaller or equal to the external diameter of pressure-bearing circle No. 1 (3), y direction at steel strand location-plate (10) upper edge steel strand location-plate (10) is provided with steel strand hole (12), is provided with external diameter at the external end head of the steel strand that pass steel strand hole (12) (8) and is connected with steel strand (8) greater than the steel strand anchor head (9) of steel strand hole (12);

The withdrawing from tension in advance of steel strand (8) structure: section is that the interior of pressure-bearing circle No. 2 (6) do not have the gap after the external screw thread of internal thread and pressure-bearing circle No. 1 (3) of the pressure-bearing circle No. 2 (6) of rectangle cooperated between the outerplanar of plane and concrete prefabricated parts (1); Be provided with on the export-oriented plane of pressure-bearing circle No. 2 (6) 3 its outer ends with pressure-bearing circle No. 1 (3) the same plane vertical with the axle center of steel strand location-plate (10) on supporting rod (19), the outerplanar of the longitudinal axis of supporting rod (19) and pressure-bearing circle No. 1 (3) is vertical, and the distance of adjacent supports rod member (19) equates; Be provided with profile and endoporus in the outside of the outer transverse plane of supporting rod (19) and be circular or polygonal circle or plane jack base (20) for circular or polygonal plate, the longitudinal axis of jack base (20) overlaps with the longitudinal axis of steel strand location-plate (10), and the interior of jack base (20) is connected to the outer face of plane with supporting rod (19); The interior distance to plane and steel strand (8) termination of jack base (20) is greater than the length of convex annular key No. 1 (34) or convex annular key No. 2 (35), and the export-oriented plane of jack base (20) is provided with internal diameter and jack cylinder (21) bottom cylindrical cooperates and positioning pipe (28) concentricity with jack base (20) and that be connected; In the outside of the outer face of jack piston (22) is provided with to plane and jack piston (22) pushing tow pressure part (24) with diameter, the export-oriented face center of pushing tow pressure part (24) is provided with the protruding key of hemispherical (30), the interior of pushing tow pressure part (24) cooperates to the export-oriented face of face with jack piston (22), with the pushing tow pressure part positioning pipe (23) that is connected with pushing tow pressure part (24) pushing tow pressure part (24) and jack piston (22) location cooperated; Supporting member No. 1 (25) is circle or polygon steel plate, the inner face of supporting member No. 1 (25) is provided with the spherical segment groove (31) that cooperates with the protruding key of hemispherical (30) with concentric its internal diameter of No. 1 (25) plane of supporting member centre of form, and the degree of depth of spherical segment groove (31) is less than the radius of the protruding key of hemispherical (30); Establishing the section identical with supporting rod (19) number of packages along the excircle of supporting member No. 1 (25) is the horizontal suspension member (15) of J-shaped, the inner inboard protruding key of suspension member (18) that is positioned at horizontal suspension member (15) matches with the groove (11) of the inner side plane outside of steel strand location-plate (10) and makes horizontal suspension member (15) location, is positioned at cuff block piece (17) the location cuff (16) in the inner outside of horizontal suspension member (15); There is the pin shaft hole (27) that supplies bolt or bearing pin (26) to pass the outer end of horizontal suspension member (15), the centre distance of the longitudinal axis of bolt or bearing pin (26) and supporting member No. 1 (25) equate and the radius of the mid point and supporting member No. 1 (25) of bolt or bearing pin (26) vertical, the plane that the longitudinal axis of bolt or bearing pin (26) forms and the plane parallel of supporting member No. 1 (25); The two ends of bolt or bearing pin (26) are passed from outrigger (29) and the pin shaft hole (27) that bolt or bearing pin (26) external diameter cooperate that is connected with No. 1 (25) outer rim of supporting member, outrigger (29) is connected by bolt or bearing pin (26) with horizontal suspension member (15) and horizontal suspension member (15) can be rotated freely along the axle center of bolt or bearing pin (26); Pressure-bearing circle No. 2 (6) and supporting rod (19) and jack base (20) and positioning pipe (28) are combined into withdrawing from tension in advance bearing (37); Jack cylinder (21) and jack piston (22) are combined into jack (38); Supporting member No. 1 (25), pushing tow pressure part positioning pipe (23), pushing tow pressure part (24) and horizontal suspension member (15), outrigger (29), bolt or bearing pin (26) are together to form withdrawing from tension in advance yoke frame combination (39); Or be that three fork-shapeds, section that angle equates are No. 2 No. 1, (40) replacement support of supporting member (25) that the steel section bar of rectangle or circle or H shape is connected and forms with the plane projection, at the interior spherical segment groove (31) that cooperates with the protruding key of hemispherical (30) that is provided with to the face center of supporting member No. 2 (40).

2. the method for operating of the structure of a kind of post-tensioning prestressed steel withdrawing from tension in advance as claimed in claim 1 is characterized in that:

The operation sequence of withdrawing from tension in advance structure: 1., the external screw thread of the internal thread and pressure-bearing circle No. 1 (3) of the pressure-bearing circle No. 2 (6) of withdrawing from tension in advance bearing (37) cooperated the no gap of realization between the outerplanar that rotates the inner plane that makes pressure-bearing circle No. 2 (6) and concrete prefabricated parts (1); 2., the bottom of the jack cylinder (21) of jack (38) is cooperated with positioning pipe (28) to make between jack cylinder (21) and the jack base (20) do not have the gap; Connecting air pump makes jack piston (22) extension elongation more than or equal to pressure-bearing pipe No. 3 (13) or No. 2 (5) length of pressure-bearing pipe of 1.5 times; 3., withdrawing from tension in advance yoke frame combination (39) being installed makes the protruding key of hemispherical (30) cooperate with spherical segment groove (31); 4., rotate each horizontal suspension member (15) and make the protruding key of suspension member (18) of its lower end cooperate the location with groove (11), cuff (16) is installed is then made each horizontal suspension member (15) location; 5., operation jack (38) makes it that condition that outside pushing tow displacement of steel strand location-plate (10) reaches dismounting pressure-bearing pipe No. 2 (5) is stopped pushing tow, dismounting No. 2, pipe of pressure-bearing (5); 6., reverse operating jack (38) makes between each pressure-bearing pipe No. 3 (13), matches between pressure-bearing pipe No. 3 (13) and the pressure-bearing pipe No. 1 (4) and the inside and outside groove of steel strand location-plate (10) and pressure-bearing circle No. 1 (3) matches; 7., continue reverse operating jack (38), the protruding key of suspension member (18) of each horizontal suspension member (15) is broken away from groove (11) after, remove withdrawing from tension in advance yoke frame combination (39); 8., remove jack (38); 9., remove withdrawing from tension in advance bearing (37); 10., with the stretch-draw machine at the stretch-draw end to steel strand (8) back sheet;

Extract steel strand (8) out from fixed end, shed steel strand location-plate (10) and pressure-bearing pipe No. 3 (13), pressure-bearing pipe No. 1 (4), No. 1, pressure-bearing circles (3) then;

Be to increase steel strand (8) and reuse number of times, No. 3, many pressure-bearing pipes (13) are set, subtract when whenever reaching reusable number of times and adorn 1 pressure-bearing pipe No. 3 (13) and get final product at the fixed end that steel strand (8) are installed.