CN201486153U

CN201486153U - Pre-annealing and pre-stretching structure for post-tensioned prestressed steel bar

Info

Publication number: CN201486153U
Application number: CN2009201763832U
Authority: CN
Inventors: 赵正义
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-09-04
Filing date: 2009-09-04
Publication date: 2010-05-26
Anticipated expiration: 2019-09-04

Abstract

The utility model relates to a pre-annealing and pre-stretching structure for a post-tensioned prestressed steel bar consisting of a stretching end and fixing end structure which can be repeatedly assembled and disassembled and a pre-annealing and pre-stretching structure together. The structure is a structural system for annealing and stretching the prestressed steel bar in advance before finally annealing, stretching and detaching a clamping sheet under the condition that the prestressed steel bar reaches the design value of tensile strength, so that the prestressed steel bar is enough to be annealed and stretched smoothly when the tension value before the final annealing and stretching is reduced to the material elongation formed by the residual tensile strength value; and the structure can fully utilize material performance, reduces the using amount of the prestressed steel bar, shortens the whole structural system comprising the structural specifications of a stretching end, a fixing end and pore canals of the prestressed steel bar, also avoids that the prestressed steel bar cannot be completely annealed and stretched and cannot be repeatedly used as the working pull of the prestressed steel bar is used to the limit, and provides new technical conditions for resource saving and cost reduction of the post-tensioned structural system for combining and decomposing a concrete precast member used for periodic movement.

Description

The pre-back sheet structure of post-tensioning prestressed steel

The back sheet structural system of the no bonded post tensioning method prestressed reinforcement of the concrete prefabricated parts structure that technical field the utility model 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 further 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 utility model purpose: the purpose of this utility model 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 make full use of the strength design standard value of prestressed reinforcement, improve its material property to 100%, 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 utility model comprise by prestressed reinforcement with reduce prestressed fixed end, stretch-draw end before ground tackle thoroughly separates in advance and be connected the prestressed reinforcement duct that connects therebetween and the structure of the prestressed reinforcement that is placed in one and fixed end is connected with the stretch-draw end and be to reach the no bonded post tensioning method prestressed constructions that other construction measure of increase prestressed reinforcement access times purpose constitutes jointly.

The fixed end of steel strand (8) structure: there is circular hole and steel strand duct end pipe (6) the steel strand duct seal ring (2) with internal diameter the outer end of the steel strand duct end pipe (6) of steel strand duct (20) and the outer facade confluce of concrete prefabricated parts (1), steel strand duct seal ring (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 steel strand duct seal ring (2) is equal with the outer facade of concrete prefabricated parts (1); The outside of steel strand duct seal ring (2) is provided with circular hole and steel strand duct seal ring (2) the pressure-bearing circle (3) with internal diameter, pressure-bearing circle (3) is the convex annular key of rectangle for section is that section is arranged is the annular groove of rectangle, to the face inboard section is arranged in it its export-oriented face inboard of circle of rectangle, and the outer diametric plane of pressure-bearing circle (3) is provided with external screw thread; The outside of pressure-bearing circle (3) be provided with the two ends section shape similar to pressure-bearing circle (3) and with No. 1, the pressure-bearing pipe (4) of pressure-bearing circle (3) with internal diameter, the length of pressure-bearing pipe No. 1 (4) is more than or equal to the length of intermediate plate (32), the protruding key of interior annular of the inward end of pressure-bearing pipe No. 1 (4) matches with the annular groove of the export-oriented face of pressure-bearing circle (3), and the annular groove of No. 1 (4) export-oriented end of pressure-bearing pipe is identical rectangle with the section of the convex annular key of inward end; Be provided with (5) 1 of No. 2, pressure-bearing pipes and number of packages in the outside of pressure-bearing circle (3) and be No. 1, the pressure-bearing pipe (4) more than or equal to 0 integer, the profile tangent along No. 1 (4) y direction of pressure-bearing pipe that intersects with No. 1 (4) diameter of pressure-bearing pipe is divided into identical No. 2,2 pressure-bearing pipe (5) with pressure-bearing pipe No. 1 (4); The outside at pressure-bearing pipe of outermost end No. 1 (4) or pressure-bearing pipe No. 2 (5) is provided with the steel strand fixed charge method end plate (7) that is shaped as cylinder or prism, the interior inboard to the plane of steel strand fixed charge method end plate (7) is provided with the annular bearing pipe detent (25) that cooperates with the protruding key of outer end exterior annular of pressure-bearing pipe No. 1 (4) or pressure-bearing pipe No. 2 (5), be provided with circular in the outside of pressure-bearing pipe detent (25) or polygonal section is that the trapezoidal or leg-of-mutton annular groove of rectangle (27) is located protruding key (31) with the hook end of pushing tow suspension member (17) and cooperated, the external diameter of steel strand fixed charge method end plate (7) is less than the external diameter of pressure-bearing circle (3), y direction at steel strand fixed charge method end plate (7) upper edge steel strand fixed charge method end plate (7) is provided with steel strand hole (26), is provided with external diameter at the external end head of the steel strand that pass steel strand hole (26) (8) and is connected with steel strand (8) greater than the anchor head (9) of steel strand hole (26); Section is that the aperture surface of the sealing nozzle circle (24) of rectangle is provided with internal thread and cooperates with the external screw thread of pressure-bearing circle (3), and its export-oriented plane is connected with the nozzle concentric of fixed end sealing tube (22); Between sealing nozzle circle (24) and steel strand duct seal ring (2) and concrete prefabricated parts (1), sealing gasket (23) is arranged; As shown in Figure 1.

The pre-back sheet structure of steel strand (8): section is that the internal thread of the support ring (18) of rectangle cooperates with the external screw thread of pressure-bearing circle (3), support ring (18) interior to plane and steel strand duct seal ring (2) outerplanar or the outerplanar of concrete prefabricated parts (1) between do not have the gap; Be provided with on the export-oriented plane of support ring (18) number of packages more than or equal to its outer end of 3 with pressure-bearing circle (3) the same plane vertical with the axle center of steel strand fixed charge method end plate (7) on support bar (10), the longitudinal axis of support bar (10) is vertical with the outerplanar of pressure-bearing circle (3), and the distance of adjacent supports bar (10) equates; Be provided with profile and endoporus in the outside of the outer transverse plane of support bar (10) and be respectively circular or polygonal circle or plane jacking bracket (11) for circular or polygonal plate, the longitudinal axis of jacking bracket (11) overlaps with the longitudinal axis of steel strand fixed charge method end plate (7), and the interior of jacking bracket (11) is connected to the outer face of plane with support bar (10); The interior distance to plane and steel strand (8) termination of jacking bracket (11) is greater than the convex annular key length of the inward end of 3 times of pressure-bearing pipes No. 1 (4), and the export-oriented plane of jacking bracket (11) is provided with internal diameter and jack cylinder body (12) cylindrical bottom cooperates and jack cylinder body keeper (13) concentricity with jacking bracket (11) and that be connected; The outside of the outer face of jack piston (14) is provided with No. 1, jack piston supporting member (16), jack piston supporting member No. 1 (16) is circle or polygon steel plate, and the inner face of jack piston supporting member No. 1 (16) is provided with concentric its internal diameter of No. 1 (16) plane of jack piston supporting member centre of form and is connected with No. 1 (16) inner face of jack piston keeper (15) and jack piston supporting member that jack piston (14) external diameter cooperates; Establishing the section identical with support bar (10) number of packages along the excircle of jack piston supporting member No. 1 (16) is L shaped pushing tow suspension member (17), the hook end of the lower end of pushing tow suspension member (17) is located protruding key (31) and is matched with the groove (27) of the inner side plane outside of steel strand fixed charge method end plate (7) and make pushing tow suspension member (17) location, there is the hole that supplies bolt or bearing pin (19) to pass the outer end of pushing tow suspension member (17), the centre distance of the longitudinal axis of bolt or bearing pin (19) and jack piston supporting member No. 1 (16) equates and is vertical with the radius of jack piston supporting member No. 1 (16) that the plane that the longitudinal axis of bolt or bearing pin (19) forms overlaps with the longitudinal axis of steel strand fixed charge method end plate (7); The two ends of bolt or bearing pin (19) are passed from the hole that and the bolt or bearing pin (19) external diameter of two beams No. 1 (21) of encorbelmenting of being connected with No. 1 (16) excircle of jack piston supporting member cooperates and the beam No. 1 (21) of encorbelmenting are connected by bolt or bearing pin (19) with pushing tow suspension member (17) and pushing tow suspension member (17) can be rotated freely; Support ring (18) and support bar (10) and jacking bracket (11) and jack cylinder body keeper (13) are combined into pre-back sheet bearing (37); Jack cylinder body (12) and jack piston (14) are combined into jack (38); Jack piston supporting member No. 1 (16) and pushing tow suspension member (17), encorbelment beam No. 1 (21), bolt or bearing pin (19), jack piston keeper (15) are together to form pre-back sheet pushing tow supporting No. 1, suspension member (39); Or be that medial surface that the steel plate of rectangle is combined into the groined type outrigger (29) of symmetry is provided with the plane for circular or polygonal plate is circular or the jack piston supporting member of polygonal circle No. 2 (30) and the jack piston keeper (15) that is connected with its concentric and 4 bolts or bearing pin (19), the common pre-back sheet pushing tow of forming of 4 pushing tow suspension members (17) support No. 2 (40) alternative pre-back sheet pushing tows of suspension members and support No. 1, suspension member (39) with the cross section; The pushing tow suspension member cuff (41) of annular is encircled and is crowded around each pushing tow suspension member (17); Shown in Fig. 2,3,4,5,6,7,8.

The stretch-draw end of steel strand (8) structure: there is circular hole and steel strand duct end pipe (6) the steel strand duct seal ring (2) with internal diameter the outer facade confluce of another outer end of steel strand duct end pipe (6) and concrete prefabricated parts (1), and the export-oriented plane of steel strand duct seal ring (2) is equal with the outer facade of concrete prefabricated parts (1); The outside of steel strand duct seal ring (2) is provided with circular hole and steel strand duct seal ring (2) the anchor ring support circle (34) with internal diameter, anchor ring support circle (34) is that section is arranged is that the annular groove of rectangle matches with anchor ring (33) cylindrical for its inboard, export-oriented plane of circle of rectangle for section, to the inboard, plane section being arranged in it is that the convex annular key of rectangle matches with the annular groove of the export-oriented face of steel strand duct seal ring (2), the outside of anchor ring support circle (34) is provided with its anchor ring that is shaped as cylindrical steel strand (8) (33), and section is that the annular groove of rectangle matches on the export-oriented face of the cylindrical inside bottom of anchor ring (33) and anchor ring support circle (34); Anchor ring (33) be provided with outer imperial palace little for the round taper hole (35) that passes of steel strand (8), between the steel strand (8) at round taper hole (35) position and anchor ring (33), be provided with intermediate plate (32); The interior of stretch-draw end sealing tube (36) is connected to the export-oriented face concentric of nozzle with sealing nozzle circle (24), the internal thread of sealing nozzle circle (24) cooperates with the external screw thread of anchor ring support circle (34), between the outer facade of sealing nozzle circle (24) and steel strand duct seal ring (2) or concrete prefabricated parts (1) sealing gasket (23) is arranged; As shown in Figure 9.

Beneficial effect the utility model adopts a kind of structural system and matching method that reaches under its tensile strength design load condition the back sheet of can be before final back sheet dismounting 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 is enough to smooth back sheet dismounting intermediate plate, and 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.Thereby the material property utilization maximization that has realized no bonded post tensioning method prestressed constructions system is moved the concrete prefabricated parts combination foundation of plant equipment of use and other all suitable structures and is further saved the money consumption reduction and opened up new technological approaches for the cycle.

Description of drawings is described in further detail the utility model below in conjunction with the drawings and specific embodiments.

Fig. 1---the fixed end structure of the pre-back sheet structure of reinforcing bar

Fig. 2---the pre-back sheet structure of reinforcing bar

Fig. 3---the A-A section of the pre-back sheet structure of reinforcing bar

Fig. 4---the B-B section of the pre-back sheet structure of reinforcing bar

Fig. 5---the C-C section of the pre-back sheet structure of reinforcing bar

Fig. 6---the D-D section of the pre-back sheet structure of reinforcing bar

Fig. 7---the E-E section of the pre-back sheet structure of reinforcing bar

Fig. 8---the F-F section of the E-E section of the pre-back sheet structure of reinforcing bar

Fig. 9---the stretch-draw end structure of the pre-back sheet structure of reinforcing bar

The specific embodiment must be made and install shown in Fig. 1,9 at the steel strand prestress connected system structure that final back sheet dismounting intermediate plate 32 makes steel strand 8 and anchor ring 33 carry out pre-back sheet the post-tensioning unbounded prestress reinforcing bar.

Fig. 2,3,4,5,6,7,8 described pre-back sheet structures, before carrying out pre-back sheet, earlier the fixed end sealing tube 22 of fixed end and sealing gasket 23 are revolved to move back and shed, begin the installation of pre-back sheet structure then: 1, the internal thread of the support ring 18 of pre-back sheet bearing 37 is cooperated precession to make the no gap of realization between the outerplanar of the inner plane of support ring 18 and steel strand duct seal ring 2 or concrete prefabricated parts 1 with the external screw thread of pressure-bearing circle 3; 2, the bottom of the jack cylinder body 12 of jack 38 is cooperated to make between jack cylinder body 12 and the jacking bracket 11 with jack cylinder body keeper 13 do not have the gap; Connecting air pump makes jack piston 14 extension elongations more than or equal to pressure-bearing pipe No. 14 or No. 25 length of pressure-bearing pipe of 1.5 times; 3, pre-back sheet pushing tow supporting suspension member being installed makes for No. 1 39 jack piston keeper 15 cooperate with jack piston 14 tops; 4, rotate pushing tow suspension member hook end that each pushing tow suspension member 17 makes its lower end and locate protruding key 31 and cooperate the location, pushing tow suspension member cuff 41 is installed is then made each pushing tow suspension member 17 in place with groove 27; 5, operation jack 38 make its with steel strand fixed charge method end plate 7 outwards displacement reach after the condition of dismounting pressure-bearing pipe No. 25 dismounting pressure-bearing pipe No. 25; 6, reverse operating jack 38 matches two pressure-bearing pipes for No. 14 and matches with the inside and outside groove of steel strand fixed charge method end plate 7 and pressure-bearing circle 3; 7, continue reverse operating jack 38, the pushing tow suspension member hook end of each pushing tow suspension member 17 is located after protruding key 31 breaks away from groove 27, remove pre-back sheet pushing tow supporting suspension member No. 1 39; 8, remove jack 38; 9, remove pre-back sheet bearing 37; 10, rotation stretch-draw end sealing tube 36 exposes stretch-draw end structure; 11, shed intermediate plate 32 with the stretch-draw machine after to each steel strand 8 back sheet, pull down anchor ring 33; 12, extract steel strand 8 out from fixed end, shed steel strand fixed charge method end plate 7 and pressure-bearing pipe No. 14, pressure-bearing circle 3 then;

Reuse number of times for increasing steel strand 8, many pressure-bearing pipes No. 14 when being installed, the fixed end of steel strand 8 is set, subtract when whenever reaching reusable number of times and adorn 1 pressure-bearing pipe No. 14, intermediate plate 32 is replaced prevent to bite steel strand 8, successive makes the inner face of steel strand fixed charge method end plate 7 dwindle until contacting with the outside distance of pressure-bearing circle 3, the stressed section of having realized steel strand 8 does not have the clamping bite mark of intermediate plate 32, to guarantee the stable performance of steel strand 8.

Claims

1. the pre-back sheet structural system of post-tensioning prestressed steel be made up of jointly the pre-back sheet structure of fixed end and stretch-draw end structure, fixed end of the pre-back sheet of post-tensioning prestressed steel structure is characterized in that:

The fixed end of steel strand (8) structure: there is circular hole and steel strand duct end pipe (6) the steel strand duct seal ring (2) with internal diameter the outer end of the steel strand duct end pipe (6) of steel strand duct (20) and the outer facade confluce of concrete prefabricated parts (1), steel strand duct seal ring (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 steel strand duct seal ring (2) is equal with the outer facade of concrete prefabricated parts (1); The outside of steel strand duct seal ring (2) is provided with circular hole and steel strand duct seal ring (2) the pressure-bearing circle (3) with internal diameter, pressure-bearing circle (3) is the convex annular key of rectangle for section is that section is arranged is the annular groove of rectangle, to the face inboard section is arranged in it its export-oriented face inboard of circle of rectangle, and the outer diametric plane of pressure-bearing circle (3) is provided with external screw thread; The outside of pressure-bearing circle (3) be provided with the two ends section shape similar to pressure-bearing circle (3) and with No. 1, the pressure-bearing pipe (4) of pressure-bearing circle (3) with internal diameter, the length of pressure-bearing pipe No. 1 (4) is more than or equal to the length of intermediate plate (32), the protruding key of interior annular of the inward end of pressure-bearing pipe No. 1 (4) matches with the annular groove of the export-oriented face of pressure-bearing circle (3), and the annular groove of No. 1 (4) export-oriented end of pressure-bearing pipe is identical rectangle with the section of the convex annular key of inward end; Be provided with (5) 1 of No. 2, pressure-bearing pipes and number of packages in the outside of pressure-bearing circle (3) and be No. 1, the pressure-bearing pipe (4) more than or equal to 0 integer, the profile tangent along No. 1 (4) y direction of pressure-bearing pipe that intersects with No. 1 (4) diameter of pressure-bearing pipe is divided into identical No. 2,2 pressure-bearing pipe (5) with pressure-bearing pipe No. 1 (4); The outside at pressure-bearing pipe of outermost end No. 1 (4) or pressure-bearing pipe No. 2 (5) is provided with the steel strand fixed charge method end plate (7) that is shaped as cylinder or prism, the interior inboard to the plane of steel strand fixed charge method end plate (7) is provided with the annular bearing pipe detent (25) that cooperates with the protruding key of outer end exterior annular of pressure-bearing pipe No. 1 (4) or pressure-bearing pipe No. 2 (5), be provided with circular in the outside of pressure-bearing pipe detent (25) or polygonal section is that the trapezoidal or leg-of-mutton annular groove of rectangle (27) is located protruding key (31) with the hook end of pushing tow suspension member (17) and cooperated, the external diameter of steel strand fixed charge method end plate (7) is less than the external diameter of pressure-bearing circle (3), y direction at steel strand fixed charge method end plate (7) upper edge steel strand fixed charge method end plate (7) is provided with steel strand hole (26), is provided with external diameter at the external end head of the steel strand that pass steel strand hole (26) (8) and is connected with steel strand (8) greater than the anchor head (9) of steel strand hole (26); Section is that the aperture surface of the sealing nozzle circle (24) of rectangle is provided with internal thread and cooperates with the external screw thread of pressure-bearing circle (3), and its export-oriented plane is connected with the nozzle concentric of fixed end sealing tube (22); Between sealing nozzle circle (24) and steel strand duct seal ring (2) and concrete prefabricated parts (1), sealing gasket (23) is arranged;

The pre-back sheet structure of steel strand (8): section is that the internal thread of the support ring (18) of rectangle cooperates with the external screw thread of pressure-bearing circle (3), support ring (18) interior to plane and steel strand duct seal ring (2) outerplanar or the outerplanar of concrete prefabricated parts (1) between do not have the gap; Be provided with on the export-oriented plane of support ring (18) number of packages more than or equal to its outer end of 3 with pressure-bearing circle (3) the same plane vertical with the axle center of steel strand fixed charge method end plate (7) on support bar (10), the longitudinal axis of support bar (10) is vertical with the outerplanar of pressure-bearing circle (3), and the distance of adjacent supports bar (10) equates; Be provided with profile and endoporus in the outside of the outer transverse plane of support bar (10) and be respectively circular or polygonal circle or plane jacking bracket (11) for circular or polygonal plate, the longitudinal axis of jacking bracket (11) overlaps with the longitudinal axis of steel strand fixed charge method end plate (7), and the interior of jacking bracket (11) is connected to the outer face of plane with support bar (10); The interior distance to plane and steel strand (8) termination of jacking bracket (11) is greater than the convex annular key length of the inward end of 3 times of pressure-bearing pipes No. 1 (4), and the export-oriented plane of jacking bracket (11) is provided with internal diameter and jack cylinder body (12) cylindrical bottom cooperates and jack cylinder body keeper (13) concentricity with jacking bracket (11) and that be connected; The outside of the outer face of jack piston (14) is provided with No. 1, jack piston supporting member (16), jack piston supporting member No. 1 (16) is circle or polygon steel plate, and the inner face of jack piston supporting member No. 1 (16) is provided with concentric its internal diameter of No. 1 (16) plane of jack piston supporting member centre of form and is connected with No. 1 (16) inner face of jack piston keeper (15) and jack piston supporting member that jack piston (14) external diameter cooperates; Establishing the section identical with support bar (10) number of packages along the excircle of jack piston supporting member No. 1 (16) is L shaped pushing tow suspension member (17), the hook end of the lower end of pushing tow suspension member (17) is located protruding key (31) and is matched with the groove (27) of the inner side plane outside of steel strand fixed charge method end plate (7) and make pushing tow suspension member (17) location, there is the hole that supplies bolt or bearing pin (19) to pass the outer end of pushing tow suspension member (17), the centre distance of the longitudinal axis of bolt or bearing pin (19) and jack piston supporting member No. 1 (16) equates and is vertical with the radius of jack piston supporting member No. 1 (16) that the plane that the longitudinal axis of bolt or bearing pin (19) forms overlaps with the longitudinal axis of steel strand fixed charge method end plate (7); The two ends of bolt or bearing pin (19) are passed from the hole that and the bolt or bearing pin (19) external diameter of two beams No. 1 (21) of encorbelmenting of being connected with No. 1 (16) excircle of jack piston supporting member cooperates and the beam No. 1 (21) of encorbelmenting are connected by bolt or bearing pin (19) with pushing tow suspension member (17) and pushing tow suspension member (17) can be rotated freely; Support ring (18) and support bar (10) and jacking bracket (11) and jack cylinder body keeper (13) are combined into pre-back sheet bearing (37); Jack cylinder body (12) and jack piston (14) are combined into jack (38); Jack piston supporting member No. 1 (16) and pushing tow suspension member (17), encorbelment beam No. 1 (21), bolt or bearing pin (19), jack piston keeper (15) are together to form pre-back sheet pushing tow supporting No. 1, suspension member (39); Or be that medial surface that the steel plate of rectangle is combined into the groined type outrigger (29) of symmetry is provided with the plane for circular or polygonal plate is circular or the jack piston supporting member of polygonal circle No. 2 (30) and the jack piston keeper (15) that is connected with its concentric and 4 bolts or bearing pin (19), the common pre-back sheet pushing tow of forming of 4 pushing tow suspension members (17) support No. 2 (40) alternative pre-back sheet pushing tows of suspension members and support No. 1, suspension member (39) with the cross section; The pushing tow suspension member cuff (41) of annular is encircled and is crowded around each pushing tow suspension member (17);

The stretch-draw end of steel strand (8) structure: there is circular hole and steel strand duct end pipe (6) the steel strand duct seal ring (2) with internal diameter the outer facade confluce of another outer end of steel strand duct end pipe (6) and concrete prefabricated parts (1), and the export-oriented plane of steel strand duct seal ring (2) is equal with the outer facade of concrete prefabricated parts (1); The outside of steel strand duct seal ring (2) is provided with circular hole and steel strand duct seal ring (2) the anchor ring support circle (34) with internal diameter, anchor ring support circle (34) is that section is arranged is that the annular groove of rectangle matches with anchor ring (33) cylindrical for its inboard, export-oriented plane of circle of rectangle for section, to the inboard, plane section being arranged in it is that the convex annular key of rectangle matches with the annular groove of the export-oriented face of steel strand duct seal ring (2), the outside of anchor ring support circle (34) is provided with its anchor ring that is shaped as cylindrical steel strand (8) (33), and section is that the annular groove of rectangle matches on the export-oriented face of the cylindrical inside bottom of anchor ring (33) and anchor ring support circle (34); Anchor ring (33) be provided with outer imperial palace little for the round taper hole (35) that passes of steel strand (8), between the steel strand (8) at round taper hole (35) position and anchor ring (33), be provided with intermediate plate (32); The interior of stretch-draw end sealing tube (36) is connected to the export-oriented face concentric of nozzle with sealing nozzle circle (24), the internal thread of sealing nozzle circle (24) cooperates with the external screw thread of anchor ring support circle (34), between the outer facade of sealing nozzle circle (24) and steel strand duct seal ring (2) or concrete prefabricated parts (1) sealing gasket (23) is arranged.