CN101914993B

CN101914993B - Construction and method for reducing stress of prestressed steel before removing anchorage device

Info

Publication number: CN101914993B
Application number: CN2010102522417A
Authority: CN
Inventors: 赵正义
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-08-13
Filing date: 2010-08-13
Publication date: 2012-07-04
Anticipated expiration: 2030-08-13
Also published as: CN101914993A

Abstract

The invention relates to a construction and a method for reducing the stress of prestressed steel before removing an anchorage device. The construction comprises a fixed end construction capable of repeated installation and removal and a pre withdrawing and tensioning construction. The construction can ensure that the stress value of the prestressed steel can be reduced to ensure that material elongation formed by a residual tensile strength value is sufficient for successful withdrawing and tensioning under the condition of ensuring repeated use performance before final withdrawing and tensioning, thereby achieving the purposes that the material performance can be sufficiently utilized, the consumption of steel is reduced, and the construction specifications of the entire construction system comprising a tensioning end, a fixing end and a steel duct are reduced; and moreover, the working tension of the prestressed steel is prevented from being extremely exerted so as to ensure that the prestressed steel can be withdrawn and tensioned in a good condition for recycling. The invention provides new technological conditions for saving the resources and reducing the cost of post-tensioning prestressing construction system for assembling and diassembling periodically moved and used prefabricated concrete parts.

Description

The structure of reducing stress of prestressed steel before removing anchorage device

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 the go ahead of the rest facility of back sheet of prestressed reinforcement; 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 operation sequence that the structure of number of times constitutes jointly in advance.

The structure of fixed end structure (101): outer end or the plane of concrete grade beam (21) that steel strand duct (23) are horizontally placed on the beam and slab structure on the independent concrete basis (1) that the concrete prefabricated parts horizontal combination that is made up of concrete grade beam (21) and concrete basis resistance to compression plate (22) forms is the vertical outer facade of regular polygon or circular cylinder concrete basic (1); The internal diameter of the steel strand sleeve pipe seal ring (4) that connects with internal diameter and concentric with steel strand duct (23) or steel strand sleeve pipe (2) is identical with the internal diameter of steel strand duct (23); The section of steel strand sleeve pipe seal ring (4) is L shaped; The export-oriented vertical plane of steel strand sleeve pipe seal ring (4) is equal with the outer facade of concrete basis (1) or concrete grade beam (21); The export-oriented face of steel strand sleeve pipe seal ring (4) is provided with the annular groove that section is a rectangle, and the internal diameter of this annular groove is identical with steel strand sleeve pipe seal ring (4) internal diameter; The internal diameter of pressure-bearing circle (5) is identical with the internal diameter of steel strand sleeve pipe seal ring (4); The interior of pressure-bearing circle (5) has the convex annular key to cooperate with the annular groove of the export-oriented face of steel strand sleeve pipe seal ring (4) to face; And pressure-bearing circle (5) interior do not have the gap to the plane with the export-oriented plane of steel strand sleeve pipe seal ring (4) and cooperates; The outer diametric plane of pressure-bearing circle (5) is provided with No. 1, external screw thread (25); The export-oriented plane of pressure-bearing circle (5) is provided with the toroidal cavity that section is a rectangle, and the internal diameter of this toroidal cavity is identical with the internal diameter of pressure-bearing circle (5); The internal diameter of pressure-bearing pipe No. 1 (16) is identical with the internal diameter of pressure-bearing circle (5), 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 (5) that the inward end of pressure-bearing pipe No. 1 (16) is provided with section; The extroversion end of pressure-bearing pipe No. 1 (16) is provided with the toroidal cavity that cooperates with No. 1 protruding key of (16) inward end annular of pressure-bearing pipe; The length of pressure-bearing pipe No. 1 (16) is greater than the length of intermediate plate (24); No. 1 (16) the interior external diameter in No. 2 (17) and pressure-bearing pipe of pressure-bearing pipe and two ends structure is identical, and the length of pressure-bearing pipe No. 1 (16) whenever uses behind certain number of times with steel strand (3) and successive shortens the length of 1 intermediate plate (24); It is cylinder that the steel strand anchor head props up seat board (8), and the steel strand anchor head props up the internal diameter of the external diameter of seat board (8) greater than pressure-bearing pipe No. 1 (16), and the outer diametric plane that the steel strand anchor head props up seat board (8) is provided with No. 2, external screw thread (38); The steel strand anchor head props up seat board (8), and interior being provided with to the plane propped up seat board (8) and No. 1 (16) concentric of pressure-bearing pipe with the steel strand anchor head and section that cooperate with No. 1 (16) export-oriented end of pressure-bearing pipe toroidal cavity is the protruding key of annular of rectangle, and the steel strand anchor head props up seat board (8) and is provided with axis direction and props up the identical steel strand hole (26) of seat board (8) axis direction with the steel strand anchor head; A termination is provided with the other end of no anchor head (9) of the steel strand (3) of anchor head (9) props up seat board (8) from the steel strand anchor head steel strand hole (26)

The structure of stretch-draw end structure (102): there is circular hole and steel strand duct (23) and steel strand sleeve pipe (2) the steel strand sleeve pipe seal ring (4) with internal diameter another outer end corresponding with fixed end of the steel strand sleeve pipe (2) of steel strand duct (23) with the outer facade confluce of concrete basis (1) or concrete grade beam (21), and facade is equal outward for the export-oriented plane of steel strand sleeve pipe seal ring (4) and the outer facade of concrete basic (1) or vertical end of concrete grade beam (21); The lateral surface of steel strand sleeve pipe seal ring (4) is provided with circular hole and steel strand duct (23) the anchor ring support circle (30) with internal diameter; Anchor ring support circle (30) is the circle of rectangle for section; It is that the external diameter and interior of annular groove and the anchor ring (31) of rectangle matches to the plane that there is section the export-oriented vertical plane inboard of anchor ring support circle (30); The outside of anchor ring support circle (30) is provided with its anchor ring that is shaped as cylindrical steel strand (3) (31), in the cylindrical of anchor ring (31) on the export-oriented face of bottom and anchor ring support circle (30) section be that the annular groove of rectangle matches; Anchor ring (31) is provided with the round taper hole (32) that the little confession steel strand (3) of outer imperial palace pass, and between the steel strand (3) at round taper hole (32) position and anchor ring (31), is provided with intermediate plate (24); The interior export-oriented face concentric to nozzle and sleeve seal ring No. 2 (34) of sealing sleeve No. 2 (33) is connected; The internal thread of sleeve seal ring No. 2 (34) No. 2 (41) cooperates with the external screw thread No. 3 (40) of anchor ring support circle (30), between the outer facade of sleeve seal ring No. 2 (34) and steel strand sleeve pipe seal ring (4) or concrete basis (1) or concrete grade beam (21) No. 2, sealing gasket (35) is arranged; Like Fig. 1,2,3,4, shown in 10.

The structure of reducing stress of prestressed steel before removing anchorage device structure (201):

The positive facade of jack supporting seat ring No. 1 (6) is that the central authorities that outer rim is shaped as polygon or circular plate have circular port, and this circular port is provided with internal thread No. 1 (39) and cooperates with the external screw thread No. 1 (25) of pressure-bearing circle (5); On the outer facade of jack supporting seat ring No. 1 (6), being provided with quantity is connected with the outerplanar that jack supports seat ring No. 1 (6) more than or equal to 3 support bar No. 1 (7); The horizontal axis of support bar No. 1 (7) is vertical with the export-oriented facade of jack supporting seat ring No. 1 (6); Support bar No. 1 (7) is regular polygon prism or cylinder or pipe; The vertical equity axis parallel of each support bar No. 1 (7) also equates with the distance in the vertical equity axle center of the central circular hole of jack supporting seat ring No. 1 (6); And the distance in the vertical equity axle center of adjacent support bar No. 1 (7) equates that the minimum range in No. 1 (6) vertical axle center, No. 1 (7) and jack supporting seat ring of each support bar is greater than the radius of No. 1 (10) outer diametric plane of power transmission sleeve pipe simultaneously; As shown in Figure 5.

The positive facade of jack supporting seat ring No. 2 (11) is polygon or circular slab; The center of this plate is provided with No. 5, circular hole (70); The internal diameter of circular hole No. 5 (70) is greater than the external diameter of dowel bar (12); No. 2 (11) vertical axis coincidings of vertical axle center of circular hole No. 5 (70) and jack supporting seat ring, the interior outer end to vertical plane each support bar No. 1 (7) identical with length of this plate does not have the gap cooperation and connects; On the export-oriented facade of jack supporting seat ring No. 2 (11), be provided with No. 1, jack supporting base positioning pipe (18) with the vertical axle center of this plate concentric; The inward end of jack supporting base positioning pipe No. 1 (18) is connected with the outer facade of jack supporting seat ring No. 2 (11), and the internal diameter of jack supporting base positioning pipe No. 1 (18) cooperates No. 1 (13) vertical equity location of hollow jack cylinder body that makes hollow jack No. 1 (36) with the external diameter of hollow jack cylinder body No. 1 (13); Jack pedestal No. 1 (50) is combined into one by jack supporting seat ring No. 1 (6), support bar No. 1 (7), jack supporting seat ring No. 2 (11) and jack supporting base positioning pipe No. 1 (18); Dowel bar (12) is cylinder or pipe; The external diameter of dowel bar (12) is less than the internal diameter of the jack center hole No. 1 (37) of hollow jack No. 1 (36); Diametric plane is provided with No. 4, external screw thread (44) outside the outer end of dowel bar (12), and the inner outer diametric plane of dowel bar (12) is provided with external screw thread No. 5 (47) and holds the internal thread No. 6 (46) of No. 1 (48) inwall of vertical circular hole to cooperate with the extroversion of being located at power transmission sleeve pipe No. 1 (10); The external diameter of power transmission sleeve pipe No. 1 (10) is identical and less than the external diameter of pressure-bearing circle (5); Its vertically inner aperture surface is provided with internal thread No. 3 (42) and cooperates with the external screw thread No. 2 (38) that the steel strand anchor head props up seat board (8), and vertical outer end aperture surface of power transmission sleeve pipe No. 1 (10) is provided with hollow jack No. 1 (36) and cooperates with the external screw thread No. 5 (47) of being located at the inner outer diametric plane of dowel bar (12); Pressure part No. 1 (15) is polygon or circular prism or cylinder for facade; The facade center of pressure part No. 1 (15) is provided with No. 2, circular hole (49), and the inwall of circular hole No. 2 (49) is provided with internal thread No. 4 (43) and cooperates with the external screw thread No. 4 (44) of dowel bar (12) outer end; Pressure part No. 1 (15) interior to vertical plane be provided with center and circular hole No. 2 (49) vertically the section of axis coincidings be that the little trapezoidal toroidal cavity of outer imperial palace No. 1 (20) cooperates with the outer end convex annular key No. 1 (19) of hollow jack annular piston No. 1 (14); Like Fig. 1,2,3,4,5,6,7, shown in 8.

The structure of reducing stress of prestressed steel before removing anchorage device structure No. 2 (202):

The positive facade of jack supporting seat ring No. 3 (51) is that the central authorities that outer rim is shaped as polygon or circular plate have circular port, and this circular port is provided with internal thread No. 9 (67) and cooperates with the external screw thread No. 1 (25) of pressure-bearing circle (5); On the outer facade of jack supporting seat ring No. 3 (51), being provided with quantity is connected with the outerplanar that jack supports seat ring No. 3 (51) more than or equal to 3 support bar No. 2 (52); The horizontal axis of support bar No. 2 (52) is vertical with the export-oriented facade of jack supporting seat ring No. 3 (51); Support bar No. 2 (52) is regular polygon prism or cylinder or pipe; The vertical equity axis parallel of each support bar No. 2 (52) also equates with the distance in the vertical equity axle center of the central circular hole of jack supporting seat ring No. 3 (51); And the distance in the vertical equity axle center of adjacent support bar No. 2 (52) equates that the minimum range in No. 3 (51) vertical axle center, No. 2 (52) and jack supporting seat ring of each support bar is greater than the radius of No. 2 (58) outer diametric planes of power transmission sleeve pipe simultaneously; The positive facade of jack supporting seat ring No. 4 (53) is polygon or circular slab; The center of this plate is provided with No. 4, circular hole (59); The internal diameter of circular hole No. 4 (59) is greater than the external diameter of power transmission sleeve pipe No. 2 (58), and the interior outer face to vertical plane each support bar No. 2 (52) identical with length of this plate does not have the gap cooperation and connects; On the export-oriented facade of jack supporting seat ring No. 4 (53), be provided with No. 2, jack supporting base positioning pipe (54) with the vertical axle center of this plate concentric; Vertical axle center of jack supporting base positioning pipe No. 2 (54) and steel strand anchor head prop up vertical axis coinciding of seat board (8), pressure-bearing pipe No. 2 (17) and pressure-bearing pipe No. 1 (16); The inward end of jack supporting base positioning pipe No. 2 (54) is connected with the outer facade of jack supporting seat ring No. 4 (53); The internal diameter of jack supporting base positioning pipe No. 2 (54) cooperates No. 2 (55) vertical equities of the hollow jack cylinder body location that makes hollow jack No. 2 (66) with the external diameter of hollow jack cylinder body No. 2 (55), jack pedestal No. 2 (68) is combined into one by jack supporting seat ring No. 3 (51), support bar No. 2 (52), jack supporting seat ring No. 4 (53) and jack supporting base positioning pipe No. 2 (54);

The external diameter of power transmission sleeve pipe No. 2 (58) is less than the internal diameter of jack center hole No. 2 (65), and it is vertical

Beneficial effect the present invention adopts a kind of structural system and outfitting tool 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 stress of prestressed steel before removing anchorage device and the basic general layout plan that concrete grade beam (21) is arranged

The structure of Fig. 2---reducing stress of prestressed steel before removing anchorage device and the basic M-M sectional drawing that concrete grade beam (21) is arranged

The general layout plan on the structure of Fig. 3---reducing stress of prestressed steel before removing anchorage device and concrete basis (1)

The V-V sectional drawing on the structure of Fig. 4---reducing stress of prestressed steel before removing anchorage device and concrete basis (1)

Fig. 5---the A2-A2 longitudinal sectional drawing of reducing stress of prestressed steel before removing anchorage device structure (201)

Fig. 6---the C-C front elevation view of reducing stress of prestressed steel before removing anchorage device structure (201)

Fig. 7---the E-E transverse cross-sectional view of reducing stress of prestressed steel before removing anchorage device structure (201)

Fig. 8---the D-D transverse cross-sectional view of reducing stress of prestressed steel before removing anchorage device structure (201)

Fixed end structure (101) sectional drawing A1-A1 of Fig. 9---reducing stress of prestressed steel before removing anchorage device structure

Stretch-draw end structure (102) sectional drawing B-B of Figure 10---reducing stress of prestressed steel before removing anchorage device structure

Figure 11---the A3-A3 longitudinal sectional drawing of reducing stress of prestressed steel before removing anchorage device structure No. 2 (202)

Figure 12---the H-H transverse cross-sectional view of reducing stress of prestressed steel before removing anchorage device structure No. 2 (202)

Figure 13---the G-G transverse cross-sectional view of reducing stress of prestressed steel before removing anchorage device structure No. 2 (202)

Figure 14---the F-F transverse cross-sectional view of reducing stress of prestressed steel before removing anchorage device structure No. 2 (202)

Specific embodiment post-tensioning unbounded prestress reinforcing bar is at reducing stress of prestressed steel before removing anchorage device structure 201 and the supporting with it fixed end structure 101 and the structure of stretch-draw end structure 102, like Fig. 1,2,3,4,5,6,7,8,9,10,11,12,13, shown in 14.

The operation sequence of reducing stress of prestressed steel before removing anchorage device structure 201:

Shed after the sealing sleeve No. 1 27 of fixed end structure 101; After the external screw thread that the internal thread of the inward end of power transmission sleeve pipe No. 1 10 No. 3 42 and steel strand anchor head are propped up seat board 8 screws for No. 2 38, the external screw thread of the internal thread No. 1 39 of jack pedestal No. 1 50 and pressure-bearing circle 5 is screwed for No. 1 25 make the interior of jack supporting seat ring No. 16 between the outer facade of face and concrete basic 1 or concrete grade beam 21, not have the gap again;

The internal thread that level is installed external screw thread No. 5 47 that dowel bar 12 makes inward end and power transmission sleeve pipe No. 1 10 screws for No. 6 46; The internal diameter that bottom external diameter that hollow jack makes hollow jack cylinder body No. 1 13 for No. 1 36 and jack supporting base positioning pipe No. 1 18 be installed cooperates and makes between the export-oriented face of baseplane and jack supporting seat ring No. 2 11 of hollow jack cylinder body No. 1 13 does not have the gap; The oil pump that hollow jack No. 1 36 is installed makes its petroleum pipeline be communicated with for No. 1 13 with hollow jack cylinder body; Handle oil pump, make the length of No. 1 14 protruding length of hollow jack annular piston more than or equal to pressure-bearing pipe No. 2 17; Pressure part is installed No. 1 15, is not had the gap between the outer facade that the convex annular key of the extroversion end that interior No. 1 20 groove bottom of annular groove and the hollow jack annular piston to face that makes that the external screw thread of internal thread No. 4 43 and dowel bar 12 outer ends of the circular hole No. 2 49 of pressure part No. 1 15 screws and make pressure part No. 1 15 for No. 4 44 is No. 1 14 is No. 1 19;

Handle the oil pump of hollow jack No. 1 36, make hollow jack annular piston continue for No. 1 14 to come off taking-up immediately after extending 2 pressure-bearing pipes No. 2 17 and the steel strand anchor head propping up seat board 8 and the pressure-bearing pipe separates for No. 1 16 outward; The oil pump of handling hollow jack No. 1 36 makes No. 1 14 retraction of hollow jack annular piston; After the interior protruding key to facade that the extroversion end groove of treating pressure-bearing pipe No. 1 16 and steel strand anchor head prop up seat board 8 cooperates; Continue to make No. 1 14 unloading of hollow jack annular piston; Bounce back hollow jack annular piston No. 1 14, the annular groove that the convex annular key No. 1 19 that makes No. 1 14 outer end of hollow jack annular piston and pressure part are No. 1 15 breaks away from for No. 1 20; Revolve and move back pressure part it is separated with dowel bar 12; Removing hollow jack makes for No. 1 36 hollow jack cylinder body No. 1 13 separate for No. 1 18 with jack supporting base positioning pipe; Revolve and move back dowel bar 12 itself and power transmission sleeve pipe are separated for No. 1 10; Revolve and move back the jack pedestal jack supporting seat ring No. 16 is separated with pressure-bearing circle 5; Revolve and move back the power transmission sleeve pipe and make for No. 1 10 itself and steel strand anchor head prop up seat board 8 to separate;

Shed the sealing sleeve No. 2 33 of stretch-draw end structure 102; With the steel strand tension machine steel strand 3 are implemented to shed intermediate plate 24 behind the back sheet; After removing anchor ring 31 and anchor ring support circle 30; Construct 101 directions from fixed end and extract steel strand 3 out, shed the steel strand anchor head at last and prop up seat board 8 and pressure-bearing circle 5, like Fig. 5, shown in 10.

The operation sequence that the reducing stress of prestressed steel before removing anchorage device structure is No. 2 202:

Shed after the sealing sleeve No. 1 27 of fixed end structure 101; After the external screw thread that the internal thread of the inward end of power transmission sleeve pipe No. 2 58 No. 7 60 and steel strand anchor head are propped up seat board 8 screws for No. 2 38, the external screw thread of the internal thread No. 9 67 of the jack supporting seat ring of jack pedestal No. 2 68 No. 3 51 and pressure-bearing circle 5 is screwed for No. 1 25 make the interior of jack supporting seat ring No. 3 51 between the outer facade of face and concrete basic 1 or concrete grade beam 21, not have the gap again;

The internal diameter that bottom external diameter that hollow jack makes hollow jack cylinder body No. 2 55 for No. 2 66 and jack supporting base positioning pipe No. 2 54 be installed cooperates and makes between the export-oriented face of baseplane and jack supporting seat ring No. 4 53 of hollow jack cylinder body No. 2 55 does not have the gap; The oil pump that hollow jack No. 2 66 is installed makes its petroleum pipeline be communicated with for No. 2 55 with hollow jack cylinder body; Handle oil pump, make the length of No. 2 56 protruding length of hollow jack annular piston more than or equal to pressure-bearing pipe No. 2 17; Pressure part is installed No. 2 57, is not had the gap between the outer facade that the convex annular key of the extroversion end that groove bottom that the interior annular groove to face that makes that the external screw thread of internal thread No. 8 62 and No. 2 58 outer ends of power transmission sleeve pipe of the circular hole No. 3 69 of pressure part No. 2 57 screws and make pressure part No. 2 57 for No. 7 61 is No. 2 64 and hollow jack annular piston are No. 2 56 is No. 2 63;

Handle the oil pump of hollow jack No. 2 66, make hollow jack annular piston continue for No. 2 56 to come off taking-up immediately after extending 2 pressure-bearing pipes No. 2 17 and the steel strand anchor head propping up seat board 8 and the pressure-bearing pipe separates for No. 1 16 outward; The oil pump of handling hollow jack No. 2 66 makes No. 2 56 retractions of hollow jack annular piston; After the interior protruding key to facade that the extroversion end groove of treating pressure-bearing pipe No. 1 16 and steel strand anchor head prop up seat board 8 cooperates; Continue the hollow jack annular piston of retraction No. 2 56, the annular groove that the convex annular key No. 2 63 that makes No. 2 56 outer ends of hollow jack annular piston and pressure part are No. 2 57 breaks away from for No. 2 64; Revolve and move back pressure part itself and power transmission sleeve pipe are separated for No. 2 58; Removing hollow jack makes for No. 2 66 hollow jack cylinder body No. 2 55 separate for No. 2 54 with jack supporting base positioning pipe; Revolve and move back the jack pedestal jack supporting seat ring No. 3 51 is separated with pressure-bearing circle 5; Revolve and move back the power transmission sleeve pipe and make for No. 2 58 itself and steel strand anchor head prop up seat board 8 to separate;

Shed the sealing sleeve No. 2 33 of stretch-draw end structure 102; With the steel strand tension machine steel strand 3 are implemented to shed intermediate plate 24 behind the back sheet; After removing anchor ring 31 and anchor ring support circle 30; Construct 101 directions from fixed end and extract steel strand 3 out, shed the steel strand anchor head at last and prop up seat board 8 and pressure-bearing circle 5, like Figure 11, shown in 10.

Claims

1. the structure of reducing stress of prestressed steel before removing anchorage device; Comprise 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, the facility that the structure of number of times constitutes jointly in advance, it is characterized in that:

The structure of fixed end structure (101): outer end or the plane of concrete grade beam (21) that steel strand duct (23) are horizontally placed on the beam and slab structure on the independent concrete basis (1) that the concrete prefabricated parts horizontal combination that is made up of concrete grade beam (21) and concrete basis resistance to compression plate (22) forms is the vertical outer facade of regular polygon or circular cylinder concrete basic (1); The internal diameter of the steel strand sleeve pipe seal ring (4) that connects with internal diameter and concentric with steel strand duct (23) or steel strand sleeve pipe (2) is identical with the internal diameter of steel strand duct (23); The section of steel strand sleeve pipe seal ring (4) is L shaped; The export-oriented vertical plane of steel strand sleeve pipe seal ring (4) is equal with the outer facade of concrete basis (1) or concrete grade beam (21); The export-oriented face of steel strand sleeve pipe seal ring (4) is provided with the annular groove that section is a rectangle, and the internal diameter of this annular groove is identical with steel strand sleeve pipe seal ring (4) internal diameter; The internal diameter of pressure-bearing circle (5) is identical with the internal diameter of steel strand sleeve pipe seal ring (4); The interior of pressure-bearing circle (5) has the convex annular key to cooperate with the annular groove of the export-oriented face of steel strand sleeve pipe seal ring (4) to face; And pressure-bearing circle (5) interior do not have the gap to the plane with the export-oriented plane of steel strand sleeve pipe seal ring (4) and cooperates; The outer diametric plane of pressure-bearing circle (5) is provided with No. 1, external screw thread (25); The export-oriented plane of pressure-bearing circle (5) is provided with the toroidal cavity that section is a rectangle, and the internal diameter of this toroidal cavity is identical with the internal diameter of pressure-bearing circle (5); The internal diameter of pressure-bearing pipe No. 1 (16) is identical with the internal diameter of pressure-bearing circle (5), 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 (5) that the inward end of pressure-bearing pipe No. 1 (16) is provided with section; The extroversion end of pressure-bearing pipe No. 1 (16) is provided with the toroidal cavity that cooperates with No. 1 protruding key of (16) inward end annular of pressure-bearing pipe; The length of pressure-bearing pipe No. 1 (16) is greater than the length of intermediate plate (24); No. 1 (16) the interior external diameter in No. 2 (17) and pressure-bearing pipe of pressure-bearing pipe and two ends structure is identical, and the length of pressure-bearing pipe No. 1 (16) whenever uses behind certain number of times with steel strand (3) and successive shortens the length of 1 intermediate plate (24); It is cylinder that the steel strand anchor head props up seat board (8), and the steel strand anchor head props up the internal diameter of the external diameter of seat board (8) greater than pressure-bearing pipe No. 1 (16), and the outer diametric plane that the steel strand anchor head props up seat board (8) is provided with No. 2, external screw thread (38); The steel strand anchor head props up seat board (8), and interior being provided with to the plane propped up seat board (8) and No. 1 (16) concentric of pressure-bearing pipe with the steel strand anchor head and section that cooperate with No. 1 (16) export-oriented end of pressure-bearing pipe toroidal cavity is the protruding key of annular of rectangle, and the steel strand anchor head props up seat board (8) and is provided with axis direction and props up the identical steel strand hole (26) of seat board (8) axis direction with the steel strand anchor head; A termination is provided with anchor head (9) steel strand (3) no anchor head (9) the other end from steel strand hole (26) that the steel strand anchor head props up seat board (8) from outside inwardly pass pressure-bearing pipe No. 2 (17) and pressure-bearing pipe No. 1 (16) and get into steel strand ducts (23) and construct (102) from the stretch-draw end and stretch out; In being provided with between the toroidal cavity between the protruding key of extroversion end annular of interior toroidal cavity and the pressure-bearing pipe No. 1 (16) to face that the steel strand anchor head props up seat board (8) or the protruding key of annular of the inward end of pressure-bearing pipe No. 1 (16) and the export-oriented plane of pressure-bearing circle (5) toroidal cavity of external diameter and No. 1 (16) protruding key 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. 1 (16) and identical No. 2, the pressure-bearing pipe (17) of toroidal cavity of export-oriented end, the length of pressure-bearing pipe No. 2 (17) is more than or equal to the length of intermediate plate (24); With with outer diametric plane that No. 2 (17) longitudinal axis of pressure-bearing pipe overlap on two straight lines between (17) one of No. 2, bundle of planes pressure-bearing pipes be divided into two; No. 1 (28) concentric of the nozzle of sealing sleeve No. 1 (27) and sleeve seal ring is connected; The internal thread that No. 1 (28) aperture surface of sleeve seal ring is provided with No. 1 (39) cooperates with the external screw thread No. 1 (25) of pressure-bearing circle (5), is provided with No. 1, sealing gasket (29) between the outer facade of vertical end of sleeve seal ring No. 1 (28) and concrete basis (1) or concrete grade beam (21);

The positive facade of jack supporting seat ring No. 1 (6) is that the central authorities that outer rim is shaped as polygon or circular plate have circular port, and this circular port is provided with internal thread No. 1 (39) and cooperates with the external screw thread No. 1 (25) of pressure-bearing circle (5); On the outer facade of jack supporting seat ring No. 1 (6), being provided with quantity is connected with the outerplanar that jack supports seat ring No. 1 (6) more than or equal to 3 support bar No. 1 (7); The horizontal axis of support bar No. 1 (7) is vertical with the export-oriented facade of jack supporting seat ring No. 1 (6); Support bar No. 1 (7) is regular polygon prism or cylinder or pipe; The vertical equity axis parallel of each support bar No. 1 (7) also equates with the distance in the vertical equity axle center of the central circular hole of jack supporting seat ring No. 1 (6); And the distance in the vertical equity axle center of adjacent support bar No. 1 (7) equates that the minimum range in No. 1 (6) vertical axle center, No. 1 (7) and jack supporting seat ring of each support bar is greater than the radius of No. 1 (10) outer diametric plane of power transmission sleeve pipe simultaneously;

The positive facade of jack supporting seat ring No. 2 (11) is polygon or circular slab; The center of this plate is provided with No. 5, circular hole (70); The internal diameter of circular hole No. 5 (70) is greater than the external diameter of dowel bar (12); No. 2 (11) vertical axis coincidings of vertical axle center of circular hole No. 5 (70) and jack supporting seat ring, the interior outer end to vertical plane each support bar No. 1 (7) identical with length of this plate does not have the gap cooperation and connects; On the export-oriented facade of jack supporting seat ring No. 2 (11), be provided with No. 1, jack supporting base positioning pipe (18) with the vertical axle center of this plate concentric; The inward end of jack supporting base positioning pipe No. 1 (18) is connected with the outer facade of jack supporting seat ring No. 2 (11), and the internal diameter of jack supporting base positioning pipe No. 1 (18) cooperates No. 1 (13) vertical equity location of hollow jack cylinder body that makes hollow jack No. 1 (36) with the external diameter of hollow jack cylinder body No. 1 (13); Jack pedestal No. 1 (50) is combined into one by jack supporting seat ring No. 1 (6), support bar No. 1 (7), jack supporting seat ring No. 2 (11) and jack supporting base positioning pipe No. 1 (18); Dowel bar (12) is cylinder or pipe; The external diameter of dowel bar (12) is less than the internal diameter of the jack center hole No. 1 (37) of hollow jack No. 1 (36); Diametric plane is provided with No. 4, external screw thread (44) outside the outer end of dowel bar (12), and the inner outer diametric plane of dowel bar (12) is provided with external screw thread No. 5 (47) and holds the internal thread No. 6 (46) of No. 1 (48) inwall of vertical circular hole to cooperate with the extroversion of being located at power transmission sleeve pipe No. 1 (10); The external diameter of power transmission sleeve pipe No. 1 (10) is identical and less than the external diameter of pressure-bearing circle (5); Its vertically inner aperture surface is provided with internal thread No. 3 (42) and cooperates with the external screw thread No. 2 (38) that the steel strand anchor head props up seat board (8), and vertical outer end aperture surface of power transmission sleeve pipe No. 1 (10) is provided with hollow jack No. 1 (36) and cooperates with the external screw thread No. 5 (47) of being located at the inner outer diametric plane of dowel bar (12); Pressure part No. 1 (15) is polygon or circular prism or cylinder for facade; The facade center of pressure part No. 1 (15) is provided with No. 2, circular hole (49), and the inwall of circular hole No. 2 (49) is provided with internal thread No. 4 (43) and cooperates with the external screw thread No. 4 (44) of dowel bar (12) outer end; Pressure part No. 1 (15) interior to vertical plane be provided with center and circular hole No. 2 (49) vertically the section of axis coincidings be that the little trapezoidal toroidal cavity of outer imperial palace No. 1 (20) cooperates with the outer end convex annular key No. 1 (19) of hollow jack annular piston No. 1 (14);

The external diameter of power transmission sleeve pipe No. 2 (58) is less than the internal diameter of jack center hole No. 2 (65); Its vertically inner aperture surface is provided with internal thread No. 7 (60) and cooperates with the external screw thread No. 2 (38) that the steel strand anchor head props up seat board (8), and diametric plane is provided with external screw thread No. 7 (61) and cooperates with the internal thread No. 8 (62) of the aperture surface of the circular hole No. 3 (69) of being located at pressure part No. 2 (57) outside vertical outer end of power transmission sleeve pipe No. 2 (58); Pressure part No. 2 (57) is polygon or circular prism or cylinder for facade; The facade center of pressure part No. 2 (57) is provided with No. 3, circular hole (69), and the external screw thread No. 7 (61) that the inwall of circular hole No. 3 (69) is provided with No. 2 (58) outer ends, No. 8 (62) and power transmission sleeve pipe of internal thread cooperates; Pressure part No. 2 (57) interior to vertical plane be provided with center and circular hole No. 3 (69) vertically the section of axis coincidings be that the little trapezoidal toroidal cavity of outer imperial palace No. 2 (64) cooperates with the outer end convex annular key No. 2 (63) of hollow jack annular piston No. 2 (56);

The operation sequence of reducing stress of prestressed steel before removing anchorage device structure (201):

The sealing sleeve No. 1 (27) that sheds fixed end structure (101) afterwards; After the external screw thread No. 2 (38) that internal thread of the inward end of power transmission sleeve pipe No. 1 (10) No. 3 (42) and steel strand anchor head are propped up seat board (8) screws, the external screw thread No. 1 (25) of the internal thread of jack pedestal No. 1 (50) No. 1 (39) and pressure-bearing circle (5) is screwed make the interior of jack supporting seat ring No. 1 (6) between the outer facade of face and concrete basic (1) or concrete grade beam (21), not have the gap again;

The internal thread No. 6 (46) that level is installed external screw thread No. 5 (47) that dowel bar (12) makes inward end and power transmission sleeve pipe No. 1 (10) screws; Hollow jack No. 1 (36) is installed to be made the bottom external diameter of hollow jack cylinder body No. 1 (13) cooperate with the internal diameter of jack supporting base positioning pipe No. 1 (18) and makes between the export-oriented face of baseplane and jack supporting seat ring No. 2 (11) of hollow jack cylinder body No. 1 (13) and do not have the gap; The oil pump that hollow jack No. 1 (36) is installed is communicated with its petroleum pipeline and hollow jack cylinder body No. 1 (13); Handle oil pump, make the length of No. 1 (14) protruding length of hollow jack annular piston more than or equal to pressure-bearing pipe No. 2 (17); No. 1, pressure part (15) is installed, is not had the gap between the outer facade of the convex annular key No. 1 (19) of the extroversion end of interior No. 1 (20) groove bottom of annular groove and the hollow jack annular piston No. 1 (14) to face that makes that the external screw thread No. 4 (44) of internal thread No. 4 (43) and dowel bar (12) outer end of the circular hole No. 2 (49) of pressure part No. 1 (15) screws and make pressure part No. 1 (15);

Handle the oil pump of hollow jack No. 1 (36), make hollow jack annular piston No. 1 (14) continue outer 2 the pressure-bearing pipes No. 2 (17) that extend and prop up with the steel strand anchor head and come off taking-up immediately after seat board (8) and pressure-bearing pipe No. 1 (16) separate; The oil pump of handling hollow jack No. 1 (36) makes No. 1 (14) retraction of hollow jack annular piston; After the interior protruding key to facade that the extroversion end groove of treating pressure-bearing pipe No. 1 (16) and steel strand anchor head prop up seat board (8) cooperates; Continue to make No. 1 (14) unloading of hollow jack annular piston; No. 1, the hollow jack annular piston (14) that bounces back, the convex annular key No. 1 (19) that makes No. 1 (14) outer end of hollow jack annular piston breaks away from the annular groove No. 1 (20) of pressure part No. 1 (15); Revolve and move back pressure part No. 1 (15) it is separated with dowel bar (12); Removing hollow jack No. 1 (36) separates hollow jack cylinder body No. 1 (13) and jack supporting base positioning pipe No. 1 (18); Revolve and move back dowel bar (12) itself and power transmission sleeve pipe No. 1 (10) are separated; Revolve and move back jack pedestal No. 1 (50) jack supporting seat ring No. 1 (6) is separated with pressure-bearing circle (5); Revolve and move back power transmission sleeve pipe No. 1 (10) and make itself and steel strand anchor head prop up seat board (8) to separate;

Shed No. 2, the sealing sleeve (33) of stretch-draw end structure (102); With the steel strand tension machine steel strand (3) are implemented to shed intermediate plate (24) behind the back sheet; After removing anchor ring (31) and anchor ring support circle (30); Extract steel strand (3) out from fixed end structure (101) direction, shed the steel strand anchor head at last and prop up seat board (8) and pressure-bearing circle (5);

The operation sequence of reducing stress of prestressed steel before removing anchorage device structure No. 2 (202):

The sealing sleeve No. 1 (27) that sheds fixed end structure (101) afterwards; After the external screw thread No. 2 (38) that internal thread of the inward end of power transmission sleeve pipe No. 2 (58) No. 7 (60) and steel strand anchor head are propped up seat board (8) screws, the external screw thread No. 1 (25) of the internal thread of the jack supporting seat ring No. 3 (51) of jack pedestal No. 2 (68) No. 9 (67) and pressure-bearing circle (5) is screwed make the interior of jack supporting seat ring No. 3 (51) between the outer facade of face and concrete basic (1) or concrete grade beam (21), not have the gap again;

Hollow jack No. 2 (66) is installed to be made the bottom external diameter of hollow jack cylinder body No. 2 (55) cooperate with the internal diameter of jack supporting base positioning pipe No. 2 (54) and makes between the export-oriented face of baseplane and jack supporting seat ring No. 4 (53) of hollow jack cylinder body No. 2 (55) and do not have the gap; The oil pump that hollow jack No. 2 (66) is installed is communicated with its petroleum pipeline and hollow jack cylinder body No. 2 (55); Handle oil pump, make the length of No. 2 (56) protruding length of hollow jack annular piston more than or equal to pressure-bearing pipe No. 2 (17); No. 2, pressure part (57) is installed, is not had the gap between the outer facade of the convex annular key No. 2 (63) of the groove bottom of the interior annular groove No. 2 (64) to face that makes that the external screw thread No. 7 (61) of internal thread No. 8 (62) and No. 2 (58) outer ends of power transmission sleeve pipe of the circular hole No. 3 (69) of pressure part No. 2 (57) screws and make pressure part No. 2 (57) and the extroversion end of hollow jack annular piston No. 2 (56);

Handle the oil pump of hollow jack No. 2 (66), make hollow jack annular piston No. 2 (56) continue outer 2 the pressure-bearing pipes No. 2 (17) that extend and prop up with the steel strand anchor head and come off taking-up immediately after seat board (8) and pressure-bearing pipe No. 1 (16) separate; The oil pump of handling hollow jack No. 2 (66) makes No. 2 (56) retractions of hollow jack annular piston; After the interior protruding key to facade that the extroversion end groove of treating pressure-bearing pipe No. 1 (16) and steel strand anchor head prop up seat board (8) cooperates; Continue retraction No. 2, hollow jack annular piston (56), the convex annular key No. 2 (63) that makes No. 2 (56) outer ends of hollow jack annular piston breaks away from the annular groove No. 2 (64) of pressure part No. 2 (57); Revolve and move back pressure part No. 2 (57) itself and power transmission sleeve pipe No. 2 (58) are separated; Removing hollow jack No. 2 (66) separates hollow jack cylinder body No. 2 (55) and jack supporting base positioning pipe No. 2 (54); Revolve and move back jack pedestal No. 2 (68) jack supporting seat ring No. 3 (51) is separated with pressure-bearing circle (5); Revolve and move back power transmission sleeve pipe No. 2 (58) and make itself and steel strand anchor head prop up seat board (8) to separate;

Shed No. 2, the sealing sleeve (33) of stretch-draw end structure (102); With the steel strand tension machine steel strand (3) are implemented to shed intermediate plate (24) behind the back sheet; After removing anchor ring (31) and anchor ring support circle (30); Extract steel strand (3) out from fixed end structure (101) direction, shed the steel strand anchor head at last and prop up seat board (8) and pressure-bearing circle (5).

2. the structure of reducing stress of prestressed steel before removing anchorage device as claimed in claim 1; It is characterized in that: the structure of stretch-draw end structure (102): there is circular hole and steel strand duct (23) and steel strand sleeve pipe (2) the steel strand sleeve pipe seal ring (4) with internal diameter another outer end corresponding with fixed end of the steel strand sleeve pipe (2) of steel strand duct (23) with the outer facade confluce of concrete basis (1) or concrete grade beam (21), and facade is equal outward for the export-oriented plane of steel strand sleeve pipe seal ring (4) and the outer facade of concrete basic (1) or vertical end of concrete grade beam (21); The lateral surface of steel strand sleeve pipe seal ring (4) is provided with circular hole and steel strand duct (23) the anchor ring support circle (30) with internal diameter; Anchor ring support circle (30) is the circle of rectangle for section; It is that the external diameter and interior of annular groove and the anchor ring (31) of rectangle matches to the plane that there is section the export-oriented vertical plane inboard of anchor ring support circle (30); The outside of anchor ring support circle (30) is provided with its anchor ring that is shaped as cylindrical steel strand (3) (31), in the cylindrical of anchor ring (31) on the export-oriented face of bottom and anchor ring support circle (30) section be that the annular groove of rectangle matches; Anchor ring (31) is provided with the round taper hole (32) that the little confession steel strand (3) of outer imperial palace pass, and between the steel strand (3) at round taper hole (32) position and anchor ring (31), is provided with intermediate plate (24); The interior export-oriented face concentric to nozzle and sleeve seal ring No. 2 (34) of sealing sleeve No. 2 (33) is connected; The internal thread of sleeve seal ring No. 2 (34) No. 2 (41) cooperates with the external screw thread No. 3 (40) of anchor ring support circle (30), between the outer facade of sleeve seal ring No. 2 (34) and steel strand sleeve pipe seal ring (4) or concrete basis (1) or concrete grade beam (21) No. 2, sealing gasket (35) is arranged.