CN101798876B

CN101798876B - Structure for reducing reinforcement stresses before tension withdrawing

Info

Publication number: CN101798876B
Application number: CN2010101573727A
Authority: CN
Inventors: 赵正义
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-04-28
Filing date: 2010-04-28
Publication date: 2012-09-12
Anticipated expiration: 2030-04-28
Also published as: CN101798876A

Abstract

The invention relates to a structure for reducing reinforcement stresses before tension withdrawing, which consists of a fixed end structure capable of being assembled and disassembled repeatedly and a pre-tension withdrawing structure. The structure enables the material elongation formed when the value of the stress of the prestressed reinforcement before final tension withdrawing reduces to a value of the remaining tensile strength to ensure the repeated use performance and smooth tension withdrawing. The structure fully utilizes the performance of the material, reduces the quantity of used reinforcement, reduces structural specifications of an integral structural system including a stretch-draw end, a fixed end and a reinforcement pore canal, and avoids the phenomenon that the prestressed reinforcement cannot be used repeatedly due to incomplete tension withdrawing caused by the reach of the limitation of the working tension of the prestressed reinforcement. Thus the structure provides the new technical condition for the resource conservation and cost reduction of a post-tensioned prestressed structure system for combining and separating concrete prefabricated parts used periodically and movably.

Description

The structure of reducing reinforcement stresses before tension withdrawing

Technical field the present invention relates to the cycle and moves the back sheet structural system of no bonded post tensioning method prestressed reinforcement of the concrete prefabricated parts structure that must make up repeatedly, decompose of use.

Background technology is present; For reach the cycle move use plant equipment (as the oil production machine of building tower crane, wireless signal tower, oil, wind-driven generator, the exploration machine etc. in ore deposit) assembling type base concrete prefabricated parts the prestressed constructions system repeatedly back sheet make the reusable purpose of prestressed reinforcement; The stress of prestressed steel design load of no bonded post tensioning method is merely about 40% of its tensile strength standard value; The difference that the Intensity Design value of this Intensity Design value and regulation and stipulation still has about 30% for 70% of its strength standard value, this is in order to realize that prestressed reinforcement can be repeatedly used another kind of considerable resource and the cost waste that causes with the purpose technical measures that reach economical with materials, reduce cost.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 stress design value of prestressed reinforcement, cause increase prestressed reinforcement consumption and whole structural system to comprise the comprehensive waste that the corresponding increase of structure in stretch-draw end, fixed end and reinforcing bar duct forms; Use the limit of regulation to the Intensity Design value of prestressed reinforcement, 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 and task provide a kind of prestressed reinforcement reach under its tensile strength design load condition can be before final back sheet dismounting anchoring intermediate plate with prestressed reinforcement the go ahead of the rest facility and the method for back sheet; Making the stress value 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 accomplish 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 horizontal joint construction system comprises fixed end, stretch-draw end and prestressed reinforcement duct simultaneously; The limit that can avoid again using regulation because of the stress value 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 before ground tackle thoroughly separates prerequisite, reduce the structure and the outfitting tool of stress of prestressed steel and increase prestressed reinforcement and reuse the structure that reduces post-tensioning prestressed steel stress in advance, facility and the method that the structure of number of times constitutes jointly in advance.

The structure of fixed end structure (101): the internal diameter of the steel strand duct seal ring (3) that connects with steel strand duct horizontal tube (20) concentric of steel strand duct (2) is identical with the internal diameter of steel strand duct (2); The section of steel strand duct seal ring (3) is L shaped; The export-oriented vertical plane of steel strand duct seal ring (3) is equal with the outer facade of basic concrete (1) or concrete grade beam (22); The export-oriented face of steel strand duct seal ring (3) is provided with the toroidal cavity that section is a rectangle, and the internal diameter of this toroidal cavity is greater than steel strand duct seal ring (3) internal diameter; The internal diameter of pressure-bearing circle (4) is identical with the internal diameter of steel strand duct seal ring (3); The interior of pressure-bearing circle (4) has the protruding key of annular to cooperate with the toroidal cavity of the export-oriented face of steel strand duct seal ring (3) to face; And pressure-bearing circle (4) interior do not have the gap to face with the export-oriented face of steel strand duct seal ring (3) and cooperates; The outer diametric plane of pressure-bearing circle (4) is provided with external screw thread, and the export-oriented face of pressure-bearing circle (4) is provided with the toroidal cavity that section is a rectangle, and the internal diameter of this toroidal cavity is greater than the internal diameter of pressure-bearing circle (4); The internal diameter of pressure-bearing pipe No. 2 (9) is identical with the internal diameter of pressure-bearing circle (4), and it is that the protruding key of annular of rectangle cooperates with the toroidal cavity of the export-oriented face of pressure-bearing circle (4) that the inward end of pressure-bearing pipe No. 2 (9) is provided with section; The extroversion end of pressure-bearing pipe No. 2 (9) is provided with the toroidal cavity that cooperates with No. 2 protruding keys of (9) inward end annular of pressure-bearing pipe; The length of pressure-bearing pipe No. 2 (9) is greater than the length of intermediate plate (36); And No. 2 (9) the interior external diameters in No. 1 (8) and pressure-bearing pipe of pressure-bearing pipe and two ends structure is identical, and the length of pressure-bearing pipe No. 2 (9) whenever uses the length that successive behind certain number of times shortens 1 intermediate plate (36) with steel strand (5); Steel strand positioning disk (6) is a cylinder, and the external diameter of steel strand positioning disk (6) is greater than the internal diameter of pressure-bearing pipe No. 2 (9), and the outer diametric plane of steel strand positioning disk (6) is provided with No. 1, external screw thread (29); It is the toroidal cavity of rectangle that steel strand positioning disk (6) interior is provided with steel strand positioning disk (6) and No. 2 (9) concentrics of pressure-bearing pipe and sections that cooperate with the protruding keys of pressure-bearing pipe No. 2 (9) export-oriented end annular to face, and steel strand positioning disk (6) is provided with the axis direction steel strand hole (32) identical with steel strand positioning disk (6) axis direction; A termination is provided with anchor head (7) steel strand (5) no anchor head (7) the other end from the steel strand hole (32) of steel strand positioning disk (6) from outside inwardly pass pressure-bearing pipe No. 1 (8) and pressure-bearing pipe No. 2 (9) and get into steel strand ducts (2) and construct (102) from the stretch-draw end and stretch out; In being provided with between the protruding key of extroversion end annular of steel strand positioning disk (6) interior toroidal cavity and pressure-bearing pipe No. 2 (9) to face or between the toroidal cavity of the protruding key of annular of the inward end of pressure-bearing pipe No. 2 (9) and the export-oriented face of pressure-bearing circle (4) toroidal cavity of external diameter and No. 2 (9) protruding keys of annular identical, its inward end of pressure-bearing pipe and export-oriented end respectively with the protruding key of annular of the inward end of pressure-bearing pipe No. 2 (9) and identical No. 1, the pressure-bearing pipe (8) of toroidal cavity of export-oriented end, the length of pressure-bearing pipe No. 1 (8) is more than or equal to the length of intermediate plate (36); With with outer diametric plane that No. 1 (8) longitudinal axis of pressure-bearing pipe overlaps on two straight lines between (8) one of No. 1, bundle of planes pressure-bearing pipes be divided into two; No. 1 (34) concentric of the nozzle of sealing sleeve No. 1 (33) and sleeve seal ring is connected; The internal thread that No. 1 (34) aperture surface of sleeve seal ring is provided with cooperates with the external screw thread of pressure-bearing circle (4), is provided with No. 1, sealing gasket (35) between the outer facade of vertical end of sleeve seal ring No. 1 (34) and basic concrete (1) or concrete grade beam (22); Shown in figure 17.

The structure of stretch-draw end structure (102): there is circular hole and steel strand duct (2) and steel strand duct horizontal tube (20) the steel strand duct seal ring (3) with internal diameter another outer end corresponding with fixed end of the steel strand duct horizontal tube (20) of steel strand duct (2) and the outer facade confluce of basic concrete (1) or concrete grade beam (22), and facade is equal outward for the export-oriented face of steel strand duct seal ring (3) and the outer facade of basic concrete (1) or vertical end of concrete grade beam (22); The lateral surface of steel strand duct seal ring (3) is provided with circular hole and steel strand duct (2) the anchor ring support circle (37) with internal diameter; Anchor ring support circle (37) is the circle of rectangle for section; It is that the external diameter and interior of toroidal cavity and the anchor ring (38) of rectangle matches to face that there is section its export-oriented vertical plane inboard; The outside of anchor ring support circle (37) is provided with its anchor ring that is shaped as cylindrical steel strand (5) (38), in the cylindrical of anchor ring (38) on the export-oriented face of bottom and anchor ring support circle (37) section be that the toroidal cavity of rectangle matches; Anchor ring (38) is provided with the round taper hole (39) that the little confession steel strand (5) of outer imperial palace pass, and between the steel strand (5) at round taper hole (39) position and anchor ring (38), is provided with intermediate plate (36); The interior export-oriented face concentric to nozzle and sleeve seal ring No. 2 (41) of sealing sleeve No. 2 (40) is connected; The internal thread of sleeve seal ring No. 2 (41) cooperates with the external screw thread of anchor ring support circle (37), between the outer facade of sleeve seal ring No. 2 (41) and steel strand duct seal ring (3) or basic concrete (1) or concrete grade beam (22) No. 2, sealing gasket (42) is arranged; Shown in figure 18.

Reduce the structure of reinforcement stresses structure No. 1 (201) in advance:

The positive facade of jack cylinder keeper No. 1 (12) is polygon or circular slab, and there is circular port in the central authorities of jack cylinder keeper No. 1 (12), and this circular port is provided with internal thread and cooperates with the external screw thread of pressure-bearing circle (4); On the outer facade of jack cylinder keeper No. 1 (12), being provided with quantity is connected more than or equal to facade outside 2 jack cylinder positioning tube No. 1 (19) and jack cylinder keeper No. 1 (12) vertical; The export-oriented face of jack cylinder keeper No. 1 (12) is the tube end of jack cylinder positioning tube No. 1 (19); The external diameter of the internal diameter of jack cylinder positioning tube No. 1 (19) and jack cylinder No. 1 (17) cooperates; The vertical equity axis parallel of each jack cylinder positioning tube No. 1 (19) and equate that with the vertical equity axis parallel and the distance of the central circular hole of jack cylinder keeper No. 1 (12) distance in the vertical equity axle center of adjacent jack cylinder positioning tube No. 1 (19) is equal; Like Fig. 5, shown in 7.

Or with the internal diameter identical and the vertical degree of depth with jack cylinder positioning tube No. 1 (19) in the concrete vertical elevation of the basic concrete (1) vertical of basic concrete (1) or concrete grade beam (22) or concrete grade beam (22) with No. 2 (9) y directions of pressure-bearing pipe with interior n the jack cylinder detent (31) of establishing; Wherein this n is the integer more than or equal to 2, and the horizontal longitudinal axis direction of jack cylinder detent (31) and pressure-bearing pipe No. 2 (9) are parallel; The vertical equity axis parallel of each jack cylinder detent (31) and equate that with the vertical equity axis parallel and the distance of the central circular hole of jack cylinder keeper No. 1 (12) the vertical equity distance of shaft centers of adjacent jack cylinder detent (31) is from equal; Like Figure 15, shown in 16.

Jack pushing tow suspender No. 1 (13) is a kind of in following two kinds of structural forms:

The structural form one of jack pushing tow suspender No. 1 (13):

The positive facade of jack pushing tow suspender No. 1 (13) is polygon or circular slab; The interior of this plate is provided with identical and No. 1 (19) identical No. 1, the jack piston detent (14) of quantity and jack cylinder positioning tube of the degree of depth to face, and the termination external diameter that is shaped as the internal diameter and jack piston No. 1 (16) of cylindrical jack piston detent No. 1 (14) cooperates; The vertical equity axis parallel of each jack piston detent No. 1 (14) and equate that with the central horizontal longitudinal axis of jack pushing tow suspender No. 1 (13) distance the distance in the vertical equity axle center of adjacent jack piston detent No. 1 (14) is equal; Like Fig. 5,6, shown in 7.

The structural form two of jack pushing tow suspender No. 1 (13):

The identical longitudinal length of outer shape and size equates and each cross sectional shape and measure-alike rod member (50) n spare; Or outer shape and the identical longitudinal length of size equate, each cross sectional shape is identical but rod member (50) n spare that size is different; Or the axle center intersection of the outer shape and an identical end of rod member (50) the n spare that the identical longitudinal length of size equates, each cross sectional shape is different and size is different is in a bit; N wherein is the integer more than or equal to 2; The longitudinal axis of rod member (50) is on same vertical plane; And the longitudinal axis angle of adjacent rod member (50) equates; The cross section centre of form of the corresponding points of simultaneously each rod member and each equal length longitudinal axis plotted point is provided with No. 1, the cylinder groove jack piston detent (14) that No. 1 (16) outer end of nozzle internal diameter inwardly and jack piston external diameter cooperates at grade on face in the outer end of each rod member (50) of jack pushing tow suspender No. 1 (13); The longitudinal axis edema with the heart involved of each jack piston detent No. 1 (14) is flat and equate with the distance of No. 1 (13) horizontal axis of jack pushing tow suspender, and equates with the distance in each jack cylinder positioning tube No. 1 (19) and No. 1 (12) vertical axle center of level of jack cylinder keeper; Like Figure 12,13, shown in 14.

Interior (15) and jack pushing tow suspender No. 1 (13) of in face is provided with connection, managing at jack pushing tow suspender No. 1 (13) are connected; Vertical axle center of pipe (15) and vertical axis coinciding of jack pushing tow suspender No. 1 (13) in connecting, the outer diametric plane that connects interior pipe (15) is provided with external screw thread No. 4 (55) and cooperates with the internal thread No. 1 (30) of the extroversion end that is connected outer tube (18); The inward end that connects outer tube (18) is provided with internal thread No. 2 (43) and cooperates with the external screw thread No. 1 (29) of steel strand positioning disk (6); Internal thread No. 1 (30) and external screw thread No. 4 (55) that the extroversion end of connection outer tube (18) is provided with cooperate, and make jack pushing tow suspender No. 1 (13), the interior pipe of connection (15), the vertical axle center that connects outer tube (18) and vertical axis coinciding of pressure-bearing pipe No. 2 (9); Like Fig. 5,6, shown in 7.

Reduce the structure of reinforcement stresses structure No. 2 (202) in advance:

The positive facade of jack cylinder keeper No. 2 (46) is polygon or circular plate, and there is circular port in the central authorities of jack cylinder keeper No. 2 (46), and this circular port is provided with internal thread and cooperates with the external screw thread of pressure-bearing circle (4); On the export-oriented face of jack cylinder keeper No. 2 (46), being provided with quantity is connected more than or equal to the outerplanar of 2 jack cylinder positioning tube No. 2 (49) and jack cylinder keeper No. 2 (46); The external diameter of the internal diameter of jack cylinder positioning tube No. 2 (49) and jack cylinder No. 2 (23) cooperates; The vertical equity axis parallel of each jack cylinder positioning tube No. 2 (49) and equate that with the distance in the vertical equity axle center of the central circular hole of jack cylinder keeper No. 2 (46) distance in the vertical equity axle center of adjacent jack cylinder positioning tube No. 2 (49) equates; Like Fig. 8, shown in 10.

Jack pushing tow suspender No. 2 (28) is with the difference of jack pushing tow suspender No. 1 (13): the position at each jack piston detent No. 1 (14) of jack pushing tow suspender No. 1 (13) is that No. 3, vertical circular hole (56) is established in vertical axle center with No. 1 vertical axle center of (14) level of jack piston detent, and the aperture surface of circular hole No. 3 (56) is provided with No. 3, the internal thread (44) that cooperates with the external screw thread of support bar (25); Support bar (25) is a cylinder; Its outer diametric plane is provided with No. 2, external screw thread (45); The inward end of support bar (25) is provided with square head or six square toes (26); The inward end of square head or six square toes (26) is provided with internal diameter and No. 2 (24) export-oriented No. 2, jack piston detents (27) of holding external diameter to cooperate of jack piston, the vertical axis coinciding of level of support bar (25) and jack piston No. 2 (24);

Jack pushing tow suspender No. 2 (28) interior on face, be provided with connect in pipe (15) and jack pushing tow suspender No. 2 (28) is connected, connect interior vertical equity axis coinciding of managing (15) and jack pushing tow suspender No. 2 (28); The outer diametric plane of managing (15) in connecting is provided with external screw thread No. 4 (55) and cooperates with the internal thread No. 1 (30) of the extroversion end that is connected outer tube (18); The internal thread No. 2 (43) of being located at the inward end that connects outer tube (18) cooperates with the external screw thread No. 1 (29) of steel strand positioning disk (6), and connection outer tube (18) is provided with (21) 2 of No. 1, the circular holes that connection outer tube (18) cross-sectional diameter is passed in the axle center; As shown in Figure 8.

Perhaps the inward end of pipe (15) is that axis is established No. 2, hole (53) with the diameter line that connects interior pipe (15) in connecting; Pass No. 2, hole (53) with pin (54); The external diameter of pipe (15) is less than the internal diameter that connects outer tube (18) in connecting; Pipe (15) is managed (52) with being connected to establish between the outer tube (18) in the connection in connecting; Establishing external screw thread No. 4 (55) in the connection on the outer diametric plane of pipe (52) cooperates with the internal thread No. 1 (30) of the extroversion end that is connected outer tube (18); No. 3 (48) cooperations of external screw thread of pipe (15) in establishing internal thread No. 4 (47) and is connected on the aperture surface of pipe (52) in the connection, the length of managing (52) in the connection is less than the interior distance to face to hole No. 2 (53) of jack pushing tow suspender No. 1 (13) or jack pushing tow suspender No. 2 (28); Like Figure 11,12,13, shown in 14.

Beneficial effect the present invention adopts a kind of structural system and the outfitting tool and method that can before prestressed reinforcement be reduced in advance reinforcement stresses under its tensile strength design load condition at final back sheet dismounting intermediate plate that reach at prestressed reinforcement; Make the stress value 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 stress value is enough to smooth back sheet and dismantles under the condition of 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 stress value of prestressed reinforcement use the limit of regulation can't intact back sheet to realize its repeated use.Realized that the material property utilization maximization of no bonded post tensioning method prestressed constructions system, concrete prefabricated parts assembling type base and other all suitable structures of plant equipment that the cycle is moved use further save the money consumption reduction.

Hereinafter combines the accompanying drawing and the specific embodiment that the present invention is done further detailed explanation.

The structure of Fig. 1---reducing reinforcement stresses before tension withdrawing and the general layout plan that concrete grade beam (22) are arranged

The structure of Fig. 2---reducing reinforcement stresses before tension withdrawing and the M-M sectional drawing that concrete grade beam (22) is arranged

The general layout plan of the structure of Fig. 3---reducing reinforcement stresses before tension withdrawing and basic concrete (1)

The V-V sectional drawing of the structure of Fig. 4---reducing reinforcement stresses before tension withdrawing and basic concrete (1)

Fig. 5---reduce the C-C longitudinal sectional drawing of reinforcement stresses structure No. 1 (201) in advance

Fig. 6---reduce the front elevation view of reinforcement stresses structure No. 1 (201) in advance

Fig. 7---reduce the B-B transverse cross-sectional view of reinforcement stresses structure No. 1 (201) in advance

Fig. 8---reduce the K-K longitudinal sectional drawing of reinforcement stresses structure No. 2 (202) in advance

Fig. 9---reduce the front elevation view of reinforcement stresses structure No. 2 (202) in advance

Figure 10---reduce the F-F transverse cross-sectional view of reinforcement stresses structure No. 2 (202) in advance

Vertical part sectioned view of pipe (15) and the second kind of joint construction that is connected outer tube (18) in the connection of Figure 11---jack pushing tow suspender No. 1 (13) or jack pushing tow suspender No. 2 (28)

The front elevation view of Figure 12---jack pushing tow suspender No. 1 (13) or jack pushing tow suspender No. 2 (28)

The L-L sectional drawing of Figure 13---jack pushing tow suspender No. 1 (13) or jack pushing tow suspender No. 2 (28)

The H-H sectional drawing of Figure 14 jack pushing tow suspender No. 1 (13) or jack pushing tow suspender No. 2 (28)

The drawing of site of Figure 15---jack cylinder detent (31) on the concrete facade of basic concrete (1) or concrete grade beam (22)

The sectional drawing of Figure 16 jack cylinder detent (31) position in the concrete of basic concrete (1) or concrete grade beam (22)

The fixed end sectional drawing of the structure of Figure 17---reducing reinforcement stresses before tension withdrawing

The stretch-draw end sectional drawing of the structure of Figure 18---reducing reinforcement stresses before tension withdrawing

Specific embodiment post-tensioning unbounded prestress reinforcing bar reduces reinforcement stresses structure No. 1 201 and reduces reinforcement stresses structure No. 2 202 and supporting with it fixed end structure 101 thereof and stretch-draw end in advance and construct 102 structure before final back sheet prerequisite, like Fig. 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17, shown in 18.

Reduce method of operating and program that reinforcement stresses is constructed No. 1 201 in advance:

After shedding the fixed end sealing sleeve No. 1 33 of fixed end structure 101; The internal thread No. 2 43 of the inward end that connects outer tube 18 and the external screw thread of steel strand positioning disk 6 are screwed for No. 1 29; Synchronous jack cylinder keeper is installed No. 1 12; The central circular hole internal thread of jack cylinder keeper No. 1 12 is cooperated with the external screw thread rotation of pressure-bearing circle 4, do not have the gap between outside the concrete of interior outer facade or the concrete grade beam 22 to face and basic concrete 1 that makes jack cylinder keeper No. 1 12; Pass with lever 51 and to be located at the circular hole No. 1 21 that connects outer tube 18, make to connect outer tube 18 location and do not rotate; Each jack cylinder is installed to be made for No. 1 17 its bottom level get into jack cylinder positioning tube No. 1 19 and not to have the gap with the outer facade of jack cylinder keeper No. 1 12; Jack pushing tow suspender is installed No. 1 13, is screwed for No. 1 30 with the internal thread of the extroversion end that is connected outer tube 18, make the interior of extroversion end and jack pushing tow suspender No. 1 13 of connection outer tube 18 not have the gap to face with the external screw thread of pipe 15 in connecting No. 4 55; Rotation adjustment jack pushing tow suspender makes for No. 1 13 each jack piston detent align each corresponding jack piston for No. 1 14 No. 1 16, handles jacking oil pump and makes the bottom land of outer end and each jack piston detent No. 1 14 of each jack piston No. 1 16 not have the gap; Handling jacking oil pump makes each jack piston No. 1 16 synchronously overhanging with the outer length of moving the gap that forms between steel strand positioning disk 6 and the pressure-bearing pipe No. 29 greater than pressure-bearing pipe No. 18 of steel strand positioning disk 6; After unloading pressure-bearing pipe No. 18,, and the protruding key of extroversion end annular of pressure-bearing pipe No. 29 aimed at the interior toroidal cavity on face of steel strand positioning disk 6 with No. 1 16 retraction of each jack piston; Continue the retraction jack piston No. 1 16, the extroversion end structure that the interior outer end that makes pressure-bearing pipe No. 29 and jack cylinder keeper are No. 1 12 and the inward end of steel strand positioning disk 6 are constructed no gap and are cooperated;

Thorough back sheet revolves the sealing sleeve No. 2 40 of back sheet pull end structure 102, with the stretch-draw machine steel strand 5 pursue the root back sheet, shed intermediate plate 36 after, construct 101 directions extraction steel strand 5 from fixed end, steel strand positioning disk 6 and pressure-bearing pipe No. 29 and pressure-bearing circle 4 are separated; Like Figure 18, shown in 5.

Pressure-bearing pipe No. 29 successive after fixed end structure 101 loads and unloads certain number of times is shortened the length that is equivalent to 1 intermediate plate 36, thereby changed it by the section of intermediate plate 36 clampings after making the certain number of times of steel strand 5 every uses; Like Fig. 5, shown in 17.

Reduce method of operating and program that reinforcement stresses is constructed No. 2 202 in advance:

After shedding the sealing sleeve No. 1 33 of fixed end structure 101; The jack cylinder keeper is installed No. 2 46; External screw thread with the screw-internal thread fit pressure-bearing circle 4 of the middle circular hole of jack cylinder keeper No. 2 46; Rotation jack cylinder keeper No. 2 46 makes the interior of jack cylinder keeper No. 2 46 outside the concrete of face and basic concrete 1 or concrete grade beam 22, not have the gap between the facade;

Jack cylinder is installed No. 2 23, the internal diameter of the bottom external diameter and the jack cylinder positioning tube of jack cylinder No. 2 23 No. 2 49 being cooperated move in the baseplane level that makes jack cylinder No. 2 23 does not have the gap with the export-oriented face of jack cylinder keeper No. 2 46 and cooperates;

Pass the circular hole No. 1 21 that connects outer tube 18 with lever 51, the outer tube 18 that is rotatably connected makes the internal thread No. 2 43 of the inward end that connects outer tube 18 cooperate for No. 1 29 with the external screw thread of steel strand positioning disk 6;

Each support bar 25 is installed, with the square head of support bar 25 or six square toes 26 inwardly, is cooperated for No. 3 44 with the internal thread of the external screw thread of the extroversion end of support bar 25 No. 2 45 and circular hole No. 3 56; Jack pushing tow suspender is installed No. 2 28; Cooperating for No. 1 30 the back to rotate jack pushing tow suspender with the external screw thread of pipe 15 in connecting No. 4 55 and the internal threads that are connected outer tube 18 export-oriented ends makes for No. 2 28 the interior of extroversion end and jack pushing tow suspender No. 2 28 of connection outer tube 18 not have the gap to face; Interior distance to face with the groove floor of the jack piston detent of the inward end of each support bar 25 No. 2 27 and jack pushing tow suspender No. 2 28 is adjusted into consistent simultaneously; The regulation and control jack makes No. 2 27 bottom surfaces of extroversion end and each jack piston detent of jack piston No. 2 24 cooperate no gap; As shown in Figure 8.

The operation jacking oil pump; After making the length of distance between the extroversion end of outer inward end that extends steel strand positioning disk 6 of jack piston No. 2 24 and pressure-bearing pipe No. 29 greater than pressure-bearing pipe No. 18; Shed the pressure-bearing pipe No. 18; Handle jacking oil pump, the protruding key of annular of the extroversion end that the retraction jack piston makes steel strand positioning disk 6 for No. 2 24 interior toroidal cavity to face and pressure-bearing pipe are No. 29 cooperates no gap; Continuing the retraction jack piston makes for No. 2 24 jack piston No. 2 24 and jack piston detent break away from for No. 2 27; In reverse rotation jack pushing tow suspender makes for No. 2 28 and connects pipe 15 be connected outer tube 18 and separate; With square head or six square toes, 26 reverse rotation support bars 25; Shed each support bar 25, connect outer tube 18 with lever 51 reverse rotations at last connection outer tube 18 is separated with steel strand positioning disk 6; As shown in Figure 8.

Reverse rotation sheds the sealing sleeve No. 2 40 of stretch-draw end structure 102, with each back sheet steel strand 5 of stretch-draw machine intermediate plate 36 is separated with anchor ring 38; Construct 101 directions from fixed end steel strand 5 are pulled out, steel strand 5 and steel strand positioning disk 6, pressure-bearing pipe No. 29 are separated with pressure-bearing circle 4; Like Figure 18, shown in 5.

Pipe 15 manages 52 with being connected to be provided with between the outer tube 18 in the connection in connecting; During installation; In will connecting earlier pipe 15 external screw thread No. 3 48 be connected in manage 52 internal thread and screw for No. 4 47; The extroversion end that makes in the connection pipe 52 and jack pushing tow suspender No. 1 13 or jack pushing tow suspender No. 2 28 interior do not have gap, installation pin 54 between face; Pipe 52 external screw thread No. 4 55 screws for No. 1 30 with the internal thread that is connected outer tube 18 in will connecting again; Shown in figure 11.

Claims

1. the structure of reducing reinforcement stresses before tension withdrawing; By prestressed reinforcement with reduce prestressed fixed end structure before ground tackle thoroughly separates prerequisite, reduce the structure and the outfitting tool of stress of prestressed steel and increase prestressed reinforcement and reuse the structure that reduces post-tensioning prestressed steel stress in advance, facility and the method that the structure of number of times constitutes jointly in advance, it is characterized in that:

The positive facade of jack cylinder keeper No. 1 (12) is polygon or circular slab, and there is circular port in the central authorities of jack cylinder keeper No. 1 (12), and this circular port is provided with internal thread and cooperates with the external screw thread of pressure-bearing circle (4); On the outer facade of jack cylinder keeper No. 1 (12), being provided with quantity is connected more than or equal to facade outside 2 jack cylinder positioning tube No. 1 (19) and jack cylinder keeper No. 1 (12) vertical; The export-oriented face of jack cylinder keeper No. 1 (12) is the tube end of jack cylinder positioning tube No. 1 (19); The external diameter of the internal diameter of jack cylinder positioning tube No. 1 (19) and jack cylinder No. 1 (17) cooperates; The vertical equity axis parallel of each jack cylinder positioning tube No. 1 (19) and equate that with the vertical equity axis parallel and the distance of the central circular hole of jack cylinder keeper No. 1 (12) distance in the vertical equity axle center of adjacent jack cylinder positioning tube No. 1 (19) is equal;

Or with the internal diameter identical and the vertical degree of depth with jack cylinder positioning tube No. 1 (19) in the concrete vertical elevation of the basic concrete (1) vertical of basic concrete (1) or concrete grade beam (22) or concrete grade beam (22) with No. 2 (9) y directions of pressure-bearing pipe with interior n the jack cylinder detent (31) of establishing; Wherein this n is the integer more than or equal to 2, and the horizontal longitudinal axis direction of jack cylinder detent (31) and pressure-bearing pipe No. 2 (9) are parallel; The vertical equity axis parallel of each jack cylinder detent (31) and equate that with the vertical equity axis parallel and the distance of the central circular hole of jack cylinder keeper No. 1 (12) the vertical equity distance of shaft centers of adjacent jack cylinder detent (31) is from equal;

The structural form one of jack pushing tow suspender No. 1 (13):

The positive facade of jack pushing tow suspender No. 1 (13) is polygon or circular slab; The interior of this plate is provided with identical and No. 1 (19) identical No. 1, the jack piston detent (14) of quantity and jack cylinder positioning tube of the degree of depth to the plane, and the termination external diameter that is shaped as the internal diameter and jack piston No. 1 (16) of cylindrical jack piston detent No. 1 (14) cooperates; The vertical equity axis parallel of each jack piston detent No. 1 (14) and equate that with the central horizontal longitudinal axis of jack pushing tow suspender No. 1 (13) distance the distance in the vertical equity axle center of adjacent jack piston detent No. 1 (14) is equal;

The structural form two of jack pushing tow suspender No. 1 (13):

The identical longitudinal length of outer shape and size equates and each cross sectional shape and measure-alike rod member (50) n spare; Or outer shape and the identical longitudinal length of size equate, each cross sectional shape is identical but rod member (50) n spare that size is different; Or the axle center intersection of the outer shape and an identical end of rod member (50) the n spare that the identical longitudinal length of size equates, each cross sectional shape is different and size is different is in a bit; N wherein is the integer more than or equal to 2; The longitudinal axis of rod member (50) is on same vertical plane; And the longitudinal axis angle of adjacent rod member (50) equates; The cross section centre of form of the corresponding points of simultaneously each rod member and each equal length longitudinal axis plotted point is provided with No. 1, the cylinder groove jack piston detent (14) that No. 1 (16) outer end of nozzle internal diameter inwardly and jack piston external diameter cooperates at grade on face in the outer end of each rod member (50) of jack pushing tow suspender No. 1 (13); The longitudinal axis edema with the heart involved of each jack piston detent No. 1 (14) is flat and equate with the distance of No. 1 (13) horizontal axis of jack pushing tow suspender, and equates with the distance in each jack cylinder positioning tube No. 1 (19) and No. 1 (12) vertical axle center of level of jack cylinder keeper;

Be provided with at the interior facade of jack pushing tow suspender No. 1 (13) and manage (15) and jack pushing tow suspender No. 1 (13) in connecting and be connected; Vertical axle center of pipe (15) and vertical axis coinciding of jack pushing tow suspender No. 1 (13) in connecting, the outer diametric plane that connects interior pipe (15) is provided with external screw thread No. 4 (55) and cooperates with the internal thread No. 1 (30) of the extroversion end that is connected outer tube (18); The inward end that connects outer tube (18) is provided with internal thread No. 2 (43) and cooperates with the external screw thread No. 1 (29) of steel strand positioning disk (6); Connect internal thread that the extroversion end of outer tube (18) is provided with No. 1 (30) with external screw thread No. 4 (55) cooperates, make jack pushing tow suspender No. 1 (13), connect in pipe (15), vertical axle center of connection outer tube (18) and vertical axis coinciding of pressure-bearing pipe No. 2 (9);

The positive facade of jack cylinder keeper No. 2 (46) is polygon or circular plate, and there is circular port in the central authorities of jack cylinder keeper No. 2 (46), and this circular port is provided with internal thread and cooperates with the external screw thread of pressure-bearing circle (4); On the export-oriented plane of jack cylinder keeper No. 2 (46), being provided with quantity is connected more than or equal to the outerplanar of 2 jack cylinder positioning tube No. 2 (49) and jack cylinder keeper No. 2 (46); The external diameter of the internal diameter of jack cylinder positioning tube No. 2 (49) and jack cylinder No. 2 (23) cooperates; The vertical equity axis parallel of each jack cylinder positioning tube No. 2 (49) and equate that with the distance in the vertical equity axle center of the central circular hole of jack cylinder keeper No. 2 (46) distance in the vertical equity axle center of adjacent jack cylinder positioning tube No. 2 (49) equates;

Jack pushing tow suspender No. 2 (28) interior on face, be provided with connect in pipe (15) and jack pushing tow suspender No. 2 (28) is connected, connect interior vertical equity axis coinciding of managing (15) and jack pushing tow suspender No. 2 (28); The outer diametric plane of managing (15) in connecting is provided with external screw thread No. 4 (55) and cooperates with the internal thread No. 1 (30) of the extroversion end that is connected outer tube (18); The internal thread No. 2 (43) of being located at the inward end that connects outer tube (18) cooperates with the external screw thread No. 1 (29) of steel strand positioning disk (6), and connection outer tube (18) is provided with (21) 2 of No. 1, the circular holes that connection outer tube (18) cross-sectional diameter is passed in the axle center;

Perhaps the inward end of pipe (15) is that axis is established No. 2, hole (53) with the diameter line that connects interior pipe (15) in connecting; Pass No. 2, hole (53) with pin (54); The external diameter of pipe (15) is less than the internal diameter that connects outer tube (18) in connecting; Pipe (15) is managed (52) with being connected to establish between the outer tube (18) in the connection in connecting; Establishing external screw thread No. 4 (55) in the connection on the outer diametric plane of pipe (52) cooperates with the internal thread No. 1 (30) of the extroversion end that is connected outer tube (18); No. 3 (48) cooperations of external screw thread of pipe (15) in establishing internal thread No. 4 (47) and is connected on the aperture surface of pipe (52) in the connection, the length of managing (52) in the connection is less than the interior distance to face to hole No. 2 (53) of jack pushing tow suspender No. 1 (13) or jack pushing tow suspender No. 2 (28).

2. the structure of reducing reinforcement stresses before tension withdrawing as claimed in claim 1 is characterized in that:

The structure of fixed end structure (101): the internal diameter of the steel strand duct seal ring (3) that connects with steel strand duct horizontal tube (20) concentric of steel strand duct (2) is identical with the internal diameter of steel strand duct (2); The section of steel strand duct seal ring (3) is L shaped; The export-oriented vertical plane of steel strand duct seal ring (3) is equal with the outer facade of basic concrete (1) or concrete grade beam (22); The export-oriented face of steel strand duct seal ring (3) is provided with the toroidal cavity that section is a rectangle, and the internal diameter of this toroidal cavity is greater than steel strand duct seal ring (3) internal diameter; The internal diameter of pressure-bearing circle (4) is identical with the internal diameter of steel strand duct seal ring (3); The interior of pressure-bearing circle (4) has the protruding key of annular to cooperate with the toroidal cavity of the export-oriented face of steel strand duct seal ring (3) to face; And pressure-bearing circle (4) interior do not have the gap to face with the export-oriented face of steel strand duct seal ring (3) and cooperates; The outer diametric plane of pressure-bearing circle (4) is provided with external screw thread, and the export-oriented face of pressure-bearing circle (4) is provided with the toroidal cavity that section is a rectangle, and the internal diameter of this toroidal cavity is greater than the internal diameter of pressure-bearing circle (4); The internal diameter of pressure-bearing pipe No. 2 (9) is identical with the internal diameter of pressure-bearing circle (4), and it is that the protruding key of annular of rectangle cooperates with the toroidal cavity of the export-oriented face of pressure-bearing circle (4) that the inward end of pressure-bearing pipe No. 2 (9) is provided with section; The extroversion end of pressure-bearing pipe No. 2 (9) is provided with the toroidal cavity that cooperates with No. 2 protruding keys of (9) inward end annular of pressure-bearing pipe; The length of pressure-bearing pipe No. 2 (9) is greater than the length of intermediate plate (36); And No. 2 (9) the interior external diameters in No. 1 (8) and pressure-bearing pipe of pressure-bearing pipe and two ends structure is identical, and the length of pressure-bearing pipe No. 2 (9) whenever uses the length that successive behind certain number of times shortens 1 intermediate plate (36) with steel strand (5); Steel strand positioning disk (6) is a cylinder, and the external diameter of steel strand positioning disk (6) is greater than the internal diameter of pressure-bearing pipe No. 2 (9), and the outer diametric plane of steel strand positioning disk (6) is provided with No. 1, external screw thread (29); It is the toroidal cavity of rectangle that steel strand positioning disk (6) interior is provided with steel strand positioning disk (6) and No. 2 (9) concentrics of pressure-bearing pipe and sections that cooperate with the protruding keys of pressure-bearing pipe No. 2 (9) export-oriented end annular to face, and steel strand positioning disk (6) is provided with the axis direction steel strand hole (32) identical with steel strand positioning disk (6) axis direction; A termination is provided with anchor head (7) steel strand (5) no anchor head (7) the other end from the steel strand hole (32) of steel strand positioning disk (6) from outside inwardly pass pressure-bearing pipe No. 1 (8) and pressure-bearing pipe No. 2 (9) and get into steel strand ducts (2) and construct (102) from the stretch-draw end and stretch out; In being provided with between the protruding key of extroversion end annular of steel strand positioning disk (6) interior toroidal cavity and pressure-bearing pipe No. 2 (9) to face or between the toroidal cavity of the protruding key of annular of the inward end of pressure-bearing pipe No. 2 (9) and the export-oriented face of pressure-bearing circle (4) toroidal cavity of external diameter and No. 2 (9) protruding keys of annular identical, its inward end of pressure-bearing pipe and export-oriented end respectively with the protruding key of annular of the inward end of pressure-bearing pipe No. 2 (9) and identical No. 1, the pressure-bearing pipe (8) of toroidal cavity of export-oriented end, the length of pressure-bearing pipe No. 1 (8) is more than or equal to the length of intermediate plate (36); With with outer diametric plane that No. 1 (8) longitudinal axis of pressure-bearing pipe overlaps on two straight lines between (8) one of No. 1, bundle of planes pressure-bearing pipes be divided into two; No. 1 (34) concentric of the nozzle of sealing sleeve No. 1 (33) and sleeve seal ring is connected; The internal thread that No. 1 (34) aperture surface of sleeve seal ring is provided with cooperates with the external screw thread of pressure-bearing circle (4), is provided with No. 1, sealing gasket (35) between the outer facade of vertical end of sleeve seal ring No. 1 (34) and basic concrete (1) or concrete grade beam (22).

3. the structure of reducing reinforcement stresses before tension withdrawing as claimed in claim 1 is characterized in that:

The structure of stretch-draw end structure (102): there is circular hole and steel strand duct (2) and steel strand duct horizontal tube (20) the steel strand duct seal ring (3) with internal diameter another outer end corresponding with fixed end of the steel strand duct horizontal tube (20) of steel strand duct (2) and the outer facade confluce of basic concrete (1) or concrete grade beam (22), and facade is equal outward for the export-oriented face of steel strand duct seal ring (3) and the outer facade of basic concrete (1) or vertical end of concrete grade beam (22); The lateral surface of steel strand duct seal ring (3) is provided with circular hole and steel strand duct (2) the anchor ring support circle (37) with internal diameter; Anchor ring support circle (37) is the circle of rectangle for section; It is that the external diameter and interior of toroidal cavity and the anchor ring (38) of rectangle matches to face that there is section its export-oriented vertical plane inboard; The outside of anchor ring support circle (37) is provided with its anchor ring that is shaped as cylindrical steel strand (5) (38), in the cylindrical of anchor ring (38) on the export-oriented face of bottom and anchor ring support circle (37) section be that the toroidal cavity of rectangle matches; Anchor ring (38) is provided with the round taper hole (39) that the little confession steel strand (5) of outer imperial palace pass, and between the steel strand (5) at round taper hole (39) position and anchor ring (38), is provided with intermediate plate (36); The interior export-oriented face concentric to nozzle and sleeve seal ring No. 2 (41) of sealing sleeve No. 2 (40) is connected; The internal thread of sleeve seal ring No. 2 (41) cooperates with the external screw thread of anchor ring support circle (37), between the outer facade of sleeve seal ring No. 2 (41) and steel strand duct seal ring (3) or basic concrete (1) or concrete grade beam (22) No. 2, sealing gasket (42) is arranged.

4. the structure of reducing reinforcement stresses before tension withdrawing as claimed in claim 2 is characterized in that:

Reduce the method for operating and the program of reinforcement stresses structure No. 1 (201) in advance:

After shedding the fixed end sealing sleeve No. 1 (33) of fixed end structure (101); The external screw thread No. 1 (29) of internal thread No. 2 (43) and steel strand positioning disk (6) that will connect the inward end of outer tube (18) screws; No. 1, synchronous jack cylinder keeper (12) is installed; The central circular hole internal thread of jack cylinder keeper No. 1 (12) is cooperated with the external screw thread rotation of pressure-bearing circle (4), do not have the gap between outside the concrete of interior outer facade or the concrete grade beam (22) to face and basic concrete (1) that makes jack cylinder keeper No. 1 (12); Pass No. 1, the circular hole (21) of being located at connection outer tube (18) with lever (51), connection outer tube (18) location is not rotated; Each jack cylinder No. 1 (17) is installed to be made its bottom level get into jack cylinder positioning tube No. 1 (19) and not to have the gap with the outer facade of jack cylinder keeper No. 1 (12); Jack No. 1, suspender of pushing tow (13) is installed; External screw thread No. 4 (55) to connect interior pipe (15) screws with the internal thread No. 1 (30) of the extroversion end that is connected outer tube (18), makes the extroversion end and the interior of jack pushing tow suspender No. 1 (13) that connect outer tube (18) not have the gap to face; Rotation adjustment jack pushing tow suspender No. 1 (13) makes each jack piston detent No. 1 (14) align No. 1, each corresponding jack piston (16), handles jacking oil pump and makes the outer end of each jack piston No. 1 (16) and the bottom land of each jack piston detent No. 1 (14) not have the gap; Handling jacking oil pump makes each jack piston No. 1 (16) synchronously overhanging with the outer length of moving the gap that forms between steel strand positioning disks (6) and the pressure-bearing pipe No. 2 (9) greater than pressure-bearing pipe No. 1 (8) of steel strand positioning disk (6); After unloading pressure-bearing pipe No. 1 (8),, and the protruding key of the extroversion end annular of pressure-bearing pipe No. 2 (9) aimed at the interior toroidal cavity on face of steel strand positioning disks (6) with No. 1 (16) retraction of each jack piston; Continue retraction No. 1, jack piston (16), make the inward end of extroversion end structure and steel strand positioning disk (6) of the interior outer end and jack cylinder keeper No. 1 (12) of pressure-bearing pipe No. 2 (9) construct no gap and cooperate;

Thorough back sheet; Revolve No. 2, the sealing sleeve (40) of back sheet pull end structure (102), steel strand (5) pursued the root back sheet with the stretch-draw machine, shed intermediate plate (36) after; Extract steel strand (5) out from fixed end structure (101) direction, steel strand positioning disk (6) and pressure-bearing pipe No. 2 (9) and pressure-bearing circle (4) are separated;

No. 2 (9) successives after fixed end structure (101) loads and unloads certain number of times of pressure-bearing pipe are shortened the length that is equivalent to 1 intermediate plate (36), thereby changed it by the section of intermediate plate (36) clamping after making the certain number of times of the every use of steel strand (5);

Reduce the method for operating and the program of reinforcement stresses structure No. 2 (202) in advance:

After shedding the sealing sleeve No. 1 (33) of fixed end structure (101); No. 2, keeper of jack cylinder (46) is installed; External screw thread with the screw-internal thread fit pressure-bearing circle (4) of the middle circular hole of jack cylinder keeper No. 2 (46); Rotation No. 2, keeper of jack cylinder (46) makes the interior of jack cylinder keeper No. 2 (46) outside the concrete of face and basic concrete (1) or concrete grade beam (22), not have the gap between the facade;

No. 2, jack cylinder (23) is installed, and the internal diameter of the bottom external diameter and jack cylinder positioning tube No. 2 (49) of jack cylinder No. 2 (23) is cooperated to move in the baseplane level that makes jack cylinder No. 2 (23) not to be had the gap with the export-oriented face of jack cylinder keeper No. 2 (46) and cooperates;

Pass No. 1, the circular hole (21) that connects outer tube (18) with lever (51), the outer tube that is rotatably connected (18) makes the internal thread No. 2 (43) of the inward end that connects outer tube (18) cooperate with the external screw thread No. 1 (29) of steel strand positioning disk (6);

Each support bar (25) is installed, with the square head of support bar (25) or six square toes (26) inwardly, is cooperated with the internal thread No. 3 (44) of external screw thread No. 2 (45) and circular hole No. 3 (56) of the extroversion end of support bar (25); Jack No. 2, suspender of pushing tow (28) is installed; External screw thread No. 4 (55) and the internal thread that is connected the export-oriented end of outer tube (18) No. 1 (30) to connect interior pipe (15) cooperate back rotation jack pushing tow suspender No. 2 (28) to make the extroversion end and the interior of jack pushing tow suspender No. 2 (28) that connect outer tube (18) not have the gap to face; Groove floor with the jack piston detent No. 2 (27) of the inward end of each support bar (25) is adjusted into consistent with the interior distance to face of jack pushing tow suspender No. 2 (28) simultaneously; The regulation and control jack makes No. 2 (27) bottom surfaces of extroversion end and each jack piston detent of jack piston No. 2 (24) cooperate no gap;

The operation jacking oil pump; After making the length of distance between the extroversion end of outer inward end that extends steel strand positioning disk (6) of jack piston No. 2 (24) and pressure-bearing pipe No. 2 (9) greater than pressure-bearing pipe No. 1 (8); Shed No. 1, pressure-bearing pipe (8); Handle jacking oil pump, the protruding key of annular of the extroversion end of retraction jack piston No. 2 (24) makes steel strand positioning disk (6) interior toroidal cavity and pressure-bearing pipe No. 2 (9) to face cooperates no gap; Continuing retraction jack piston No. 2 (24) breaks away from jack piston No. 2 (24) and jack piston detent No. 2 (27); Manage (15) in reverse rotation jack pushing tow suspender No. 2 (28) makes and connects and be connected outer tube (18) separation; With square head or six square toes (26) reverse rotation support bars (25); Shed each support bar (25), connect outer tube (18) with lever (51) reverse rotation at last connection outer tube (18) is separated with steel strand positioning disk (6);

Pipe (15) is managed (52) with being connected to be provided with between the outer tube (18) in the connection in connecting; During installation; In will connecting earlier the external screw thread No. 3 (48) of pipe (15) be connected in manage (52) internal thread No. 4 (47) screw; The extroversion end that makes in the connection pipe (52) and jack pushing tow suspender No. 1 (13) or jack pushing tow suspender No. 2 (28) interior do not have gap, installation pin (54) between face; External screw thread No. 4 (55) and the internal thread that is connected outer tube (18) No. 1 (30) of pipe (52) screw in will connecting again.