CN201473964U

CN201473964U - Reinforcing steel bar stress construction reducing prestressing force beforehand before tension withdrawal

Info

Publication number: CN201473964U
Application number: CN2009201761112U
Authority: CN
Inventors: 赵正义
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-09-07
Filing date: 2009-09-07
Publication date: 2010-05-19
Anticipated expiration: 2019-09-07

Abstract

A reinforcing steel bar stress construction reducing prestressing force beforehand before tension withdrawal is formed by a stretching end and a fixing end, which can be installed and dismantled repeatedly, which is a construction system in which when prestressed reinforcement reaches a tensile strength design value, the tension of the prestressed reinforcement is withdrawn beforehand before the final tension withdrawal and the dismantlement of a clamping piece. The tension value of the prestressed reinforcement before the final tension withdrawal is reduced to the extent that the material elongation degree formed by the residual tensile strength value thereof ensures smooth tension withdrawal. The material performance can be made the best of, the usage of the prestressed reinforcement is reduced, the construction specification of the whole construction system is reduced, including the stretching end, the fixing end and the pore canal of the prestressed reinforcement and the repeated use of the prestressed reinforcement is ensured. The utility model provides the technical condition for saving resource and reducing cost in the post-tensioning prestressing force construction system of concrete prefabricated part combination and disassembly for periodical movement.

Description

Reduce the stress of prestressed steel structure before the back sheet in advance

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

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

Summary of the invention the utility model purpose: the purpose of this utility model and task provide a kind of structural system that reaches under its tensile strength design load condition the back sheet of can be before final back sheet dismounting anchoring intermediate plate prestressed reinforcement being gone ahead of the rest at prestressed reinforcement, making the value of thrust of prestressed reinforcement before final back sheet be reduced to the formed material elongation of its remaining tensile strength values in advance is enough to finish smoothly back sheet dismounting anchoring intermediate plate, and prestressed reinforcement and ground tackle are thoroughly decomposed.Like this, both can make full use of the strength design standard value of prestressed reinforcement, improve its material property to 100%, thereby reduce the consumption of prestressed reinforcement, reduce the structure specification that whole structural system comprises fixed end, stretch-draw end and prestressed reinforcement duct simultaneously; The limit that can avoid again using regulation because of the value of thrust of prestressed reinforcement can't realize its repeated use by intact back sheet.For the resources conservation of the no bonded post tensioning method prestressed constructions system that further realizes being used for the concrete prefabricated parts combination, decompose with reduce cost new technical condition are provided.

Technical scheme the utility model comprise by prestressed reinforcement with reduce prestressed fixed end, stretch-draw end before ground tackle thoroughly separates in advance and be connected the prestressed reinforcement duct that connects therebetween and the structure of the prestressed reinforcement that is placed in one and fixed end is connected with the stretch-draw end and be to reach the no bonded post tensioning method prestressed constructions that other construction measure of increase prestressed reinforcement access times purpose constitutes jointly.

Stretch-draw end of the present utility model is configured with following three kinds of forms:

No. 1 (101) of stretch-draw end structure of steel strand (10): circular hole and prestressed reinforcement duct end pipe (2) were with No. 1, the prestressed reinforcement duct seal ring (4) of internal diameter in the outer end of the prestressed reinforcement duct end pipe (2) of prestressed reinforcement duct (3) and the outer facade confluce of concrete prefabricated element (1) were provided with, it is the annular groove of rectangle for the polygon section that there is profile the export-oriented face inboard of prestressed reinforcement duct seal ring No. 1 (4), and the export-oriented face of prestressed reinforcement duct seal ring No. 1 (4) is equal with the outer facade of concrete prefabricated element (1); The outside of prestressed reinforcement duct seal ring No. 1 (4) is provided with pressure-bearing pipeloop united piece (6), pressure-bearing pipeloop united piece (6) is three kinds of combination of shapes bodies from inside to outside: the profile of base ring is that prism matches with the exocyclic connected in star of prestressed reinforcement duct seal ring No. 1 (4), and its outerplanar is equal with the outerplanar of prestressed reinforcement duct seal ring No. 1 (4); The pressure-bearing clamping ring is the circle of external diameter less than No. 1 (4) external diameter of prestressed reinforcement duct seal ring, and its outer diametric plane is provided with external screw thread; The outer diametric plane of pipe is provided with external screw thread in the pre-back sheet; Pipe concentric and endoporus are formed pressure-bearing pipeloop united piece (6) jointly with internal diameter in base ring and pressure-bearing circle and the pre-back sheet; Anchor ring location pressure-bearing pipe (8) be a tubular body, and its inboard one section be pre-back sheet outer tube, manages identically in it in the pre-back sheet of external diameter and pressure-bearing pipeloop united piece (6), but the external thread rotary on the thread rotary orientation that its outer diametric plane is provided with and the interior pipe of back sheet in advance is to opposite; The cross section that the outer end of anchor ring location pressure-bearing pipe (8) is one section is polygon and its inscribed circle external diameter more than or equal to pre-back sheet outer tube; The inboard, outer end of anchor ring location pressure-bearing pipe (8) is provided with the annular groove that section is a rectangle; The outside of anchor ring location pressure-bearing pipe (8) is provided with and is shaped as No. 1, cylindrical anchor ring (9), match with the annular groove of the inboard, outer end of anchor ring location pressure-bearing pipe (8) in its inboard, imperial palace is little outside No. 1 (9) y direction of anchor ring is provided with round taper hole (31) passes for steel strand (10), between the steel strand (10) at round taper hole (31) position of anchor ring No. 1 (9) and anchor ring No. 1 (9) steel strand anchor sheet (11) is arranged; Gear back sheet sleeve (7) is the tubular body of variable cross-section, circular hole is provided with the opposite internal thread of the equal rotation direction of longitudinal length is located pressure-bearing pipe (8) respectively with pressure-bearing pipeloop united piece (6) and anchor ring the interior pipe of pre-back sheet in it, the rightabout external screw thread of pre-back sheet outer tube matches, pressure-bearing pipeloop united piece (6), after pipe and pre-back sheet outer tube screwed with the internal thread of gear back sheet sleeve (7) respectively in the pre-back sheet of anchor ring location pressure-bearing pipe (8), the outer end of pipe and pre-back sheet outer tube and inner distance were more than or equal to the length of steel strand anchor sheet (11) and more than or equal to managing in the pre-back sheet in the pre-back sheet, the externally threaded length that does not screw with the internal thread of gear back sheet sleeve (7) of the equal length of pre-back sheet outer tube; Be provided with along its excircle in vertical middle part of gear back sheet sleeve (7) gear is set, the profile of vertical both ends equal lengths section of gear back sheet sleeve (7) is cylindrical; The interior inner headed face to nozzle of close and protect sleeve (12) is provided with internal thread and cooperates with the external screw thread of the pressure-bearing circle of pressure-bearing pipeloop united piece (6), there is close and protect sleeve seal ring (13) to be connected at the interior of close and protect sleeve (12) to tube port position, between the export-oriented face of close and protect sleeve seal ring (13) and pressure-bearing pipeloop united piece (6) or prestressed reinforcement duct seal ring No. 1 (4) sealing gasket (5) arranged with close and protect sleeve (12); Shown in Fig. 1,6,7,8,9.

No. 2 (102) of stretch-draw end structure of steel strand (10): the prism back sheet sleeve (16) that substitutes the gear of being located at gear back sheet sleeve (7) excircle with the prism with gear back sheet sleeve (7) same sector position and length substitutes gear back sheet sleeve (7), and all the other each position structures are identical with the stretch-draw end structure No. 1 (101) of steel strand (10); Shown in Fig. 3,6,7,9,11.

No. 3 (103) of the stretch-draw end of steel strand (10) structure: there is circular hole and prestressed reinforcement duct end pipe (2) No. 1, the prestressed reinforcement duct seal ring (4) with internal diameter the outer end of the prestressed reinforcement duct end pipe (2) of prestressed reinforcement duct (3) and the outer facade confluce of concrete prefabricated element (1), prestressed reinforcement duct seal ring No. 1 (4) is that section is arranged is the annular groove of rectangle its export-oriented face inboard of circle of rectangle for section, and the export-oriented face of prestressed reinforcement duct seal ring No. 1 (4) is equal with the outer facade of concrete prefabricated element (1); The outside of prestressed reinforcement duct seal ring No. 1 (4) is provided with circular hole and prestressed reinforcement duct seal ring No. 1 (4) No. 1, the pressure-bearing circle (17) with internal diameter, pressure-bearing circle No. 1 (17) is that section is arranged is the annular groove of rectangle for its export-oriented face inboard of circle of rectangle for section, the outer diametric plane inside part of pressure-bearing circle No. 1 (17) matches with the annular groove of prestressed reinforcement duct seal ring No. 1 (4), and the outer diametric plane of pressure-bearing circle No. 1 (17) is provided with external screw thread; It is similar that the outside of pressure-bearing circle No. 1 (17) is provided with the outer end of outer end section shape and pressure-bearing circle No. 1 (17), the inner is shaped as that in its circular flat inboard section to be arranged be the convex annular key of rectangle, and with No. 1, the pressure-bearing pipe (18) of pressure-bearing circle No. 1 (17) with internal diameter, the length of pressure-bearing pipe No. 1 (18) is more than or equal to the length of steel strand anchor sheet (11), the annular groove of the export-oriented face of the protruding key of interior annular and pressure-bearing circle No. 1 (17) of the inward end of pressure-bearing pipe No. 1 (18) matches, and the annular groove of No. 1 (18) export-oriented end of pressure-bearing pipe is identical rectangle with the section of the convex annular key of inward end; Be provided with number of packages in the outside of pressure-bearing circle No. 1 (17) and be No. 1, pressure-bearing pipe (18) more than or equal to 1 integer; Be provided with in the outside of the pressure-bearing pipe No. 1 (18) of outermost end and be shaped as No. 2, cylindrical anchor ring (21), the interior inboard to the plane of anchor ring No. 2 (21) is provided with the annular groove (20) that cooperates with the protruding key of outer end exterior annular of pressure-bearing pipe No. 1 (18), the external diameter of anchor ring No. 2 (21) is less than the external diameter of pressure-bearing circle No. 1 (17), y direction at anchor ring No. 2 (21) upper edges anchor ring No. 2 (21) is provided with round taper hole (31), is provided with steel strand anchor sheet (11) between steel strand that pass round taper hole (31) (10) and anchor ring No. 2 (21); The interior of close and protect sleeve (12) is connected with the export-oriented periphery concentric of close and protect sleeve seal ring (13) to nozzle, the external screw thread of the internal thread of close and protect sleeve seal ring (13) and pressure-bearing circle No. 1 (17) cooperates, and between the outer facade of close and protect sleeve seal ring (13) and prestressed reinforcement duct seal ring No. 1 (4) or concrete prefabricated element (1) sealing gasket (5) is arranged; As shown in Figure 5.

Fixed end of the present utility model is configured with following two kinds of forms:

No. 1 (201) of fixed end structure of steel strand (10): No. 2 (22) concentrics of outer end and pressure-bearing circle that the export-oriented other end of steel strand (10) is provided with prestressed reinforcement duct end pipe (2), prestressed reinforcement duct end pipe (2) are connected, No. 2 (22) interior circular holes of pressure-bearing circle and the same internal diameter of prestressed reinforcement duct end pipe (2); Internal diameter is connected greater than the export-oriented face concentric of the inner face and pressure-bearing circle No. 2 (22) of the pressure-bearing pipe outer tube (30) of No. 2 (22) circular hole internal diameters of pressure-bearing circle; Interior circular hole is that internal diameter equals, external diameter is identical and be connected with the outer end of pressure-bearing pipe outer tube (30) greater than the internal diameter of the circular hole internal diameter of the prestressed reinforcement duct seal ring No. 2 (28) of the taper circular hole of internal diameter and pressure-bearing pipe outer tube (30), and the outside of prestressed reinforcement duct seal ring No. 2 (28) is equal with the outerplanar of concrete prefabricated element (1); The sealing rubber stopper (29) that is shaped as the little frustum of a cone of outer imperial palace cooperates with the taper circular hole of prestressed reinforcement duct seal ring No. 2 (28), and its outerplanar and prestressed reinforcement duct seal ring No. 2 (28) are equal; It is 3: 2: 1 that the outside of pressure-bearing circle No. 2 (22) is provided with its length ratio from inside to outside successively, internal diameter is identical with prestressed reinforcement duct end pipe (2) internal diameter, external diameter is No. 3, the pressure-bearing pipe (23) of rectangle less than the section of pressure-bearing pipe outer tube (30) internal diameter, No. 4, pressure-bearing pipe (24), No. 5 (25) each 1 of pressure-bearing pipe, be provided with steel strand location-plate (15) in the outside of pressure-bearing pipe No. 5 (25), be provided with steel strand cylindrical hole (26) along steel strand location-plate (15) y direction and pass for steel strand (10), the external end head of steel strand (10) is provided with the steel strand anchor head (14) of its external diameter greater than steel strand cylindrical hole (26) internal diameter; As shown in Figure 4.

No. 2 (202) of fixed end structure of steel strand (10): circular hole and prestressed reinforcement duct end pipe (2) were with No. 1, the prestressed reinforcement duct seal ring (4) of internal diameter in the outer end of the prestressed reinforcement duct end pipe (2) of prestressed reinforcement duct (3) and the outer facade confluce of concrete prefabricated element (1) were provided with, it is the annular groove of rectangle for the polygon section that there is profile the export-oriented face inboard of prestressed reinforcement duct seal ring No. 1 (4), and the export-oriented face of prestressed reinforcement duct seal ring No. 1 (4) is equal with the outer facade of concrete prefabricated element (1); The outside of prestressed reinforcement duct seal ring No. 1 (4) is provided with pressure-bearing pipeloop united piece (6), pressure-bearing pipeloop united piece (6) is three kinds of combination of shapes bodies from inside to outside: the profile of base ring is that prism matches with the exocyclic connected in star of prestressed reinforcement duct seal ring No. 1 (4), and its outerplanar is equal with the outerplanar of prestressed reinforcement duct seal ring No. 1 (4); The pressure-bearing clamping ring is the circle of external diameter less than No. 1 (4) external diameter of prestressed reinforcement duct seal ring, and its outer diametric plane is provided with external screw thread; The outer diametric plane of pipe is provided with external screw thread in the pre-back sheet; Pipe concentric and endoporus are formed pressure-bearing pipeloop united piece (6) jointly with internal diameter in base ring and pressure-bearing circle and the pre-back sheet; The support pipe (32) of steel strand location-plate is a tubular body, its inboard one section is pre-back sheet outer tube, in it in pre-back sheet of external diameter and pressure-bearing pipeloop united piece (6) pipe identical, but the external thread rotary on the thread rotary orientation that its outer diametric plane is provided with and the interior pipe of back sheet in advance is to opposite; The cross section that the outer end of the support pipe (32) of steel strand location-plate is one section is polygon and its inscribed circle external diameter more than or equal to pre-back sheet outer tube; The inboard, outer end of the support pipe (32) of steel strand location-plate is provided with the annular groove that section is a rectangle; The outside of the support pipe (32) of steel strand location-plate is provided with and is shaped as cylindrical steel strand location-plate (15), match with the annular groove of the inboard, outer end of the support pipe (32) of steel strand location-plate in its inboard, be provided with steel strand cylindrical hole (26) along steel strand location-plate (15) y direction and pass for steel strand (10), the end of the steel strand (10) outside steel strand location-plate (15) is provided with steel strand anchor head (14) and is connected with steel strand (10); Gear back sheet sleeve (7) is the tubular body of variable cross-section, circular hole is provided with the opposite internal thread of rotation direction that longitudinal length equates and manages respectively with in the pre-back sheet of the support pipe (32) of pressure-bearing pipeloop united piece (6) and steel strand location-plate in it, the rightabout external screw thread of pre-back sheet outer tube matches, pressure-bearing pipeloop united piece (6), after pipe and pre-back sheet outer tube screwed with the internal thread of gear back sheet sleeve (7) respectively in the pre-back sheet of the support pipe (32) of steel strand location-plate, the outer end of pipe and pre-back sheet outer tube and inner distance were more than or equal to the length of steel strand anchor sheet (11) and more than or equal to managing in the pre-back sheet in the pre-back sheet, the externally threaded length that does not screw with the internal thread of gear back sheet sleeve (7) of the equal length of pre-back sheet outer tube; Be provided with along its excircle in vertical middle part of gear back sheet sleeve (7) gear is set, the profile of vertical both ends equal lengths section of gear back sheet sleeve (7) is cylindrical; The interior of close and protect sleeve (12) is connected with the export-oriented face concentric of close and protect sleeve seal ring (13) to nozzle, the internal thread of close and protect sleeve seal ring (13) cooperates with the external screw thread of the pressure-bearing clamping ring of pressure-bearing pipeloop united piece (6), between the export-oriented face of close and protect sleeve seal ring (13) and pressure-bearing pipeloop united piece (6) or prestressed reinforcement duct seal ring No. 1 (4) sealing gasket (5) is arranged; Shown in Fig. 2,6,7,8,10.

The compound mode of stretch-draw end of the present utility model and fixed end is: No. 1 No. 1 (201) combination in (101) and fixed end structure of stretch-draw end structure, or No. 2 No. 1 (201) combinations in (102) and fixed end structure of stretch-draw end structure, or No. 3 No. 2 (202) combinations in (103) and fixed end structure of stretch-draw end structure.

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

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

Fig. 1---No. 1 (101) sectional drawing of stretch-draw end structure

Fig. 2---No. 2 (202) sectional drawings of fixed end structure

Fig. 3---No. 2 (102) sectional drawings of stretch-draw end structure

Fig. 4---No. 1 (201) sectional drawing of fixed end structure

Fig. 5---No. 3 (103) sectional drawings of stretch-draw end structure

Fig. 6---stretch-draw end structure No. 1 (101), fixed end structure No. 2 (202), stretch-draw ends are constructed the A-A sectional drawing of No. 2 (102)

Fig. 7---stretch-draw end structure No. 1 (101), fixed end structure No. 2 (202), stretch-draw ends are constructed the B-B sectional drawing of No. 2 (102)

Fig. 8---stretch-draw end structure No. 1 (101), fixed end are constructed the C-C sectional drawing of No. 2 (202)

Fig. 9---stretch-draw end structure No. 1 (101), stretch-draw end are constructed the D-D sectional drawing of No. 2 (102)

Figure 10---the E-E sectional drawing of fixed end structure No. 2 (202)

Figure 11---the F-F sectional drawing of stretch-draw end structure No. 2 (102)

Specific embodiment Fig. 1,2,3,4,5,6,7,8,9,10,11 described 3 kinds of stretch-draw ends structures of the present utility model and 2 kinds of fixed ends be configured in concrete prefabricated element 1 aggregate erection in place after, stretch-draw end structure is installed No. 1 101 and each member of fixed end structure No. 1 201 or stretch-draw end structure No. 2 102 and fixed end structure No. 1 201 or stretch-draw end structure No. 3 103 and fixed end structure No. 2 202 by diagram assigned position from-inner-to-outer successive; Pressure-bearing pipeloop united piece 6 is equated more than or equal to the length of steel strand anchor sheet 11 and with the left and right line of demarcation distance of revolving of gear back sheet sleeve 7 internal threads with the adjacent two ends distance with gear back sheet sleeve 7 screws of anchor ring location pressure-bearing pipe 8; Steel strand 10, dress steel strand anchor sheet 11 is installed close and protect sleeve 12 or sealing rubber stopper 29 with behind the stretch-draw machine stretch-draw steel strand 10;

When decomposing concrete prefabricated element 1, at first shed close and protect sleeve 12, the operating sequence of back sheet in advance of the steel strand 10 of the fixed end that stretch-draw end that stretch-draw end structure is No. 1 101 or fixed end structure are No. 2 202: cooperate with the gear of gear back sheet sleeve 7 with the spline spanner that cooperates with gear back sheet sleeve 7 outer Knucle-gears or the output low rotation speed large torque gear of change set, the support pipe 32 that makes anchor ring locate pressure-bearing pipe 8 or steel strand location-plate with the sleeve spanner that cooperates with the prism of the outer end of the support pipe 32 of anchor ring location pressure-bearing pipe 8 or steel strand location-plate does not rotate, rotation spline spanner or actuating motor rotate the gear of gear back sheet sleeve 7, and the distance that the adjacent both ends that makes pressure-bearing pipeloop united piece 6 and anchor ring locate the support pipe 32 of pressure-bearing pipe 8 or pressure-bearing pipeloop united piece 6 and steel strand location-plate is dwindled is more than or equal to the length of steel strand anchor sheet 11; With the stretch-draw machine steel strand 10 are carried out dismantling steel strand anchor sheet 11 behind the back sheet; Steel strand 10 are extracted out from No. 1 201 direction of fixed end structure;

Or to cooperate with the prism of prism back sheet sleeve 16 and anchor ring location pressure-bearing pipe 8 respectively, after the rotation spanner makes the length of distance more than or equal to steel strand anchor sheet 11 that pressure-bearing pipeloop united piece 6 and anchor ring location pressure-bearing pipe 8 adjacent two ends dwindle, steel strand 10 to No. 2 102 outer ends of stretch-draw end structure carry out shedding steel strand anchor sheet 11 behind the back sheet again, extract steel strand 10 out from No. 1 201 direction of fixed end structure;

Stretch-draw end structure No. 1 101 and fixed end structure make up for No. 1 201 or the repeated use number of times of the steel strand 10 of stretch-draw end structure No. 2 102 and No. 1 201 combination of fixed end structure in order to increase, after constructing the certain number of times of every dismounting, reduce to install more than or equal to the pressure-bearing pipe No. 5 25 of 1 steel strand anchor sheet 11 length or pressure-bearing pipe No. 4 24 or pressure-bearing pipe No. 3 23, the clamp area displacement that makes 11 pairs of steel strand 10 of steel strand anchor sheet is to guarantee the stability of pre-stress system;

Disassemble stretch-draw end structure No. 3 103 and fixed end structure No. 2 202 o'clock, make length that the support pipe 32 adjacent two ends distances of pressure-bearing pipeloop united piece 6 and steel strand location-plate dwindle length by the program of disassembling stretch-draw end structure No. 1 101 earlier more than or equal to 1 steel strand anchor sheet 11; Begin from the outer end of stretch-draw end structure No. 3 103 with the stretch-draw machine to steel strand 10 back sheets and dismantle steel strand anchor sheet 11 thereafter;

For the steel strand 10 that increase stretch-draw end structure No. 3 103 and No. 2 202 combinations of fixed end structure are reused number of times, number of packages has been installed for more than or equal to 1 pressure-bearing pipe No. 1 18 between anchor ring No. 2 21 and pressure-bearing circle No. 1 17, behind the certain number of times of steel strand 10 every repetition dismounting, adorn 1 pressure-bearing pipe No. 1 18 when mounted less, successive reduces, the steel strand anchor sheet 11 and the clamp area of steel strand 10 are shifted, reduce use cost simultaneously with the stable performance of guaranteeing the prestressed constructions system.

Claims

1. reduce stress of prestressed steel before the back sheet in advance and construct the structural system of the reduction stress of prestressed reinforcement before final back sheet of the post-tensioning unbounded prestress structure that forms by different stretch-draw ends and fixed end tectonic association, it is characterized in that:

No. 1 (101) of stretch-draw end structure of steel strand (10): circular hole and prestressed reinforcement duct end pipe (2) were with No. 1, the prestressed reinforcement duct seal ring (4) of internal diameter in the outer end of the prestressed reinforcement duct end pipe (2) of prestressed reinforcement duct (3) and the outer facade confluce of concrete prefabricated element (1) were provided with, it is the annular groove of rectangle for the polygon section that there is profile the export-oriented face inboard of prestressed reinforcement duct seal ring No. 1 (4), and the export-oriented face of prestressed reinforcement duct seal ring No. 1 (4) is equal with the outer facade of concrete prefabricated element (1); The outside of prestressed reinforcement duct seal ring No. 1 (4) is provided with pressure-bearing pipeloop united piece (6), pressure-bearing pipeloop united piece (6) is three kinds of combination of shapes bodies from inside to outside: the profile of base ring is that prism matches with the exocyclic connected in star of prestressed reinforcement duct seal ring No. 1 (4), and its outerplanar is equal with the outerplanar of prestressed reinforcement duct seal ring No. 1 (4); The pressure-bearing clamping ring is the circle of external diameter less than No. 1 (4) external diameter of prestressed reinforcement duct seal ring, and its outer diametric plane is provided with external screw thread; The outer diametric plane of pipe is provided with external screw thread in the pre-back sheet; Pipe concentric and endoporus are formed pressure-bearing pipeloop united piece (6) jointly with internal diameter in base ring and pressure-bearing circle and the pre-back sheet; Anchor ring location pressure-bearing pipe (8) be a tubular body, and its inboard one section be pre-back sheet outer tube, manages identically in it in the pre-back sheet of external diameter and pressure-bearing pipeloop united piece (6), but the external thread rotary on the thread rotary orientation that its outer diametric plane is provided with and the interior pipe of back sheet in advance is to opposite; The cross section that the outer end of anchor ring location pressure-bearing pipe (8) is one section is polygon and its inscribed circle external diameter more than or equal to pre-back sheet outer tube; The inboard, outer end of anchor ring location pressure-bearing pipe (8) is provided with the annular groove that section is a rectangle; The outside of anchor ring location pressure-bearing pipe (8) is provided with and is shaped as No. 1, cylindrical anchor ring (9), match with the annular groove of the inboard, outer end of anchor ring location pressure-bearing pipe (8) in its inboard, imperial palace is little outside No. 1 (9) y direction of anchor ring is provided with round taper hole (31) passes for steel strand (10), between the steel strand (10) at round taper hole (31) position of anchor ring No. 1 (9) and anchor ring No. 1 (9) steel strand anchor sheet (11) is arranged; Gear back sheet sleeve (7) is the tubular body of variable cross-section, circular hole is provided with the opposite internal thread of the equal rotation direction of longitudinal length is located pressure-bearing pipe (8) respectively with pressure-bearing pipeloop united piece (6) and anchor ring the interior pipe of pre-back sheet in it, the rightabout external screw thread of pre-back sheet outer tube matches, pressure-bearing pipeloop united piece (6), after pipe and pre-back sheet outer tube screwed with the internal thread of gear back sheet sleeve (7) respectively in the pre-back sheet of anchor ring location pressure-bearing pipe (8), the outer end of pipe and pre-back sheet outer tube and inner distance were more than or equal to the length of steel strand anchor sheet (11) and more than or equal to managing in the pre-back sheet in the pre-back sheet, the externally threaded length that does not screw with the internal thread of gear back sheet sleeve (7) of the equal length of pre-back sheet outer tube; Be provided with along its excircle in vertical middle part of gear back sheet sleeve (7) gear is set, the profile of vertical both ends equal lengths section of gear back sheet sleeve (7) is cylindrical; The interior inner headed face to nozzle of close and protect sleeve (12) is provided with internal thread and cooperates with the external screw thread of the pressure-bearing circle of pressure-bearing pipeloop united piece (6), there is close and protect sleeve seal ring (13) to be connected at the interior of close and protect sleeve (12) to tube port position, between the export-oriented face of close and protect sleeve seal ring (13) and pressure-bearing pipeloop united piece (6) or prestressed reinforcement duct seal ring No. 1 (4) sealing gasket (5) arranged with close and protect sleeve (12);

No. 2 (102) of stretch-draw end structure of steel strand (10): the prism back sheet sleeve (16) that substitutes the gear of being located at gear back sheet sleeve (7) excircle with the prism with gear back sheet sleeve (7) same sector position and length substitutes gear back sheet sleeve (7), and all the other each position structures are identical with the stretch-draw end structure No. 1 (101) of steel strand (10);

No. 3 (103) of the stretch-draw end of steel strand (10) structure: there is circular hole and prestressed reinforcement duct end pipe (2) No. 1, the prestressed reinforcement duct seal ring (4) with internal diameter the outer end of the prestressed reinforcement duct end pipe (2) of prestressed reinforcement duct (3) and the outer facade confluce of concrete prefabricated element (1), prestressed reinforcement duct seal ring No. 1 (4) is that section is arranged is the annular groove of rectangle its export-oriented face inboard of circle of rectangle for section, and the export-oriented face of prestressed reinforcement duct seal ring No. 1 (4) is equal with the outer facade of concrete prefabricated element (1); The outside of prestressed reinforcement duct seal ring No. 1 (4) is provided with circular hole and prestressed reinforcement duct seal ring No. 1 (4) No. 1, the pressure-bearing circle (17) with internal diameter, pressure-bearing circle No. 1 (17) is that section is arranged is the annular groove of rectangle for its export-oriented face inboard of circle of rectangle for section, the outer diametric plane inside part of pressure-bearing circle No. 1 (17) matches with the annular groove of prestressed reinforcement duct seal ring No. 1 (4), and the outer diametric plane of pressure-bearing circle No. 1 (17) is provided with external screw thread; It is similar that the outside of pressure-bearing circle No. 1 (17) is provided with the outer end of outer end section shape and pressure-bearing circle No. 1 (17), the inner is shaped as that in its circular flat inboard section to be arranged be the convex annular key of rectangle, and with No. 1, the pressure-bearing pipe (18) of pressure-bearing circle No. 1 (17) with internal diameter, the length of pressure-bearing pipe No. 1 (18) is more than or equal to the length of steel strand anchor sheet (11), the annular groove of the export-oriented face of the protruding key of interior annular and pressure-bearing circle No. 1 (17) of the inward end of pressure-bearing pipe No. 1 (18) matches, and the annular groove of No. 1 (18) export-oriented end of pressure-bearing pipe is identical rectangle with the section of the convex annular key of inward end; Be provided with number of packages in the outside of pressure-bearing circle No. 1 (17) and be No. 1, pressure-bearing pipe (18) more than or equal to 1 integer; Be provided with in the outside of the pressure-bearing pipe No. 1 (18) of outermost end and be shaped as No. 2, cylindrical anchor ring (21), the interior inboard to the plane of anchor ring No. 2 (21) is provided with the annular groove (20) that cooperates with the protruding key of outer end exterior annular of pressure-bearing pipe No. 1 (18), the external diameter of anchor ring No. 2 (21) is less than the external diameter of pressure-bearing circle No. 1 (17), y direction at anchor ring No. 2 (21) upper edges anchor ring No. 2 (21) is provided with round taper hole (31), is provided with steel strand anchor sheet (11) between steel strand that pass round taper hole (31) (10) and anchor ring No. 2 (21); The interior of close and protect sleeve (12) is connected with the export-oriented periphery concentric of close and protect sleeve seal ring (13) to nozzle, the external screw thread of the internal thread of close and protect sleeve seal ring (13) and pressure-bearing circle No. 1 (17) cooperates, and between the outer facade of close and protect sleeve seal ring (13) and prestressed reinforcement duct seal ring No. 1 (4) or concrete prefabricated element (1) sealing gasket (5) is arranged;

No. 1 (201) of fixed end structure of steel strand (10): No. 2 (22) concentrics of outer end and pressure-bearing circle that the export-oriented other end of steel strand (10) is provided with prestressed reinforcement duct end pipe (2), prestressed reinforcement duct end pipe (2) are connected, No. 2 (22) interior circular holes of pressure-bearing circle and the same internal diameter of prestressed reinforcement duct end pipe (2); Internal diameter is connected greater than the export-oriented face concentric of the inner face and pressure-bearing circle No. 2 (22) of the pressure-bearing pipe outer tube (30) of No. 2 (22) circular hole internal diameters of pressure-bearing circle; Interior circular hole is that internal diameter equals, external diameter is identical and be connected with the outer end of pressure-bearing pipe outer tube (30) greater than the internal diameter of the circular hole internal diameter of the prestressed reinforcement duct seal ring No. 2 (28) of the taper circular hole of internal diameter and pressure-bearing pipe outer tube (30), and the outside of prestressed reinforcement duct seal ring No. 2 (28) is equal with the outerplanar of concrete prefabricated element (1); The sealing rubber stopper (29) that is shaped as the little frustum of a cone of outer imperial palace cooperates with the taper circular hole of prestressed reinforcement duct seal ring No. 2 (28), and its outerplanar and prestressed reinforcement duct seal ring No. 2 (28) are equal; It is 3: 2: 1 that the outside of pressure-bearing circle No. 2 (22) is provided with its length ratio from inside to outside successively, internal diameter is identical with prestressed reinforcement duct end pipe (2) internal diameter, external diameter is No. 3, the pressure-bearing pipe (23) of rectangle less than the section of pressure-bearing pipe outer tube (30) internal diameter, No. 4, pressure-bearing pipe (24), No. 5 (25) each 1 of pressure-bearing pipe, be provided with steel strand location-plate (15) in the outside of pressure-bearing pipe No. 5 (25), be provided with steel strand cylindrical hole (26) along steel strand location-plate (15) y direction and pass for steel strand (10), the external end head of steel strand (10) is provided with the steel strand anchor head (14) of its external diameter greater than steel strand cylindrical hole (26) internal diameter;

No. 2 (202) of fixed end structure of steel strand (10): circular hole and prestressed reinforcement duct end pipe (2) were with No. 1, the prestressed reinforcement duct seal ring (4) of internal diameter in the outer end of the prestressed reinforcement duct end pipe (2) of prestressed reinforcement duct (3) and the outer facade confluce of concrete prefabricated element (1) were provided with, it is the annular groove of rectangle for the polygon section that there is profile the export-oriented face inboard of prestressed reinforcement duct seal ring No. 1 (4), and the export-oriented face of prestressed reinforcement duct seal ring No. 1 (4) is equal with the outer facade of concrete prefabricated element (1); The outside of prestressed reinforcement duct seal ring No. 1 (4) is provided with pressure-bearing pipeloop united piece (6), pressure-bearing pipeloop united piece (6) is three kinds of combination of shapes bodies from inside to outside: the profile of base ring is that prism matches with the exocyclic connected in star of prestressed reinforcement duct seal ring No. 1 (4), and its outerplanar is equal with the outerplanar of prestressed reinforcement duct seal ring No. 1 (4); The pressure-bearing clamping ring is the circle of external diameter less than No. 1 (4) external diameter of prestressed reinforcement duct seal ring, and its outer diametric plane is provided with external screw thread; The outer diametric plane of pipe is provided with external screw thread in the pre-back sheet; Pipe concentric and endoporus are formed pressure-bearing pipeloop united piece (6) jointly with internal diameter in base ring and pressure-bearing circle and the pre-back sheet; The support pipe (32) of steel strand location-plate is a tubular body, its inboard one section is pre-back sheet outer tube, in it in pre-back sheet of external diameter and pressure-bearing pipeloop united piece (6) pipe identical, but the external thread rotary on the thread rotary orientation that its outer diametric plane is provided with and the interior pipe of back sheet in advance is to opposite; The cross section that the outer end of the support pipe (32) of steel strand location-plate is one section is polygon and its inscribed circle external diameter more than or equal to pre-back sheet outer tube; The inboard, outer end of the support pipe (32) of steel strand location-plate is provided with the annular groove that section is a rectangle; The outside of the support pipe (32) of steel strand location-plate is provided with and is shaped as cylindrical steel strand location-plate (15), match with the annular groove of the inboard, outer end of the support pipe (32) of steel strand location-plate in its inboard, be provided with steel strand cylindrical hole (26) along steel strand location-plate (15) y direction and pass for steel strand (10), the end of the steel strand (10) outside steel strand location-plate (15) is provided with steel strand anchor head (14) and is connected with steel strand (10); Gear back sheet sleeve (7) is the tubular body of variable cross-section, circular hole is provided with the opposite internal thread of rotation direction that longitudinal length equates and manages respectively with in the pre-back sheet of the support pipe (32) of pressure-bearing pipeloop united piece (6) and steel strand location-plate in it, the rightabout external screw thread of pre-back sheet outer tube matches, pressure-bearing pipeloop united piece (6), after pipe and pre-back sheet outer tube screwed with the internal thread of gear back sheet sleeve (7) respectively in the pre-back sheet of the support pipe (32) of steel strand location-plate, the outer end of pipe and pre-back sheet outer tube and inner distance were more than or equal to the length of steel strand anchor sheet (11) and more than or equal to managing in the pre-back sheet in the pre-back sheet, the externally threaded length that does not screw with the internal thread of gear back sheet sleeve (7) of the equal length of pre-back sheet outer tube; Be provided with along its excircle in vertical middle part of gear back sheet sleeve (7) gear is set, the profile of vertical both ends equal lengths section of gear back sheet sleeve (7) is cylindrical; The interior of close and protect sleeve (12) is connected with the export-oriented face concentric of close and protect sleeve seal ring (13) to nozzle; the internal thread of close and protect sleeve seal ring (13) cooperates with the external screw thread of the pressure-bearing clamping ring of pressure-bearing pipeloop united piece (6), between the export-oriented face of close and protect sleeve seal ring (13) and pressure-bearing pipeloop united piece (6) or prestressed reinforcement duct seal ring No. 1 (4) sealing gasket (5) is arranged.