CN104060525B - Steel strand intermediate plate anchor additional anchor device, tension tool and mounting method - Google Patents
Steel strand intermediate plate anchor additional anchor device, tension tool and mounting method Download PDFInfo
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- CN104060525B CN104060525B CN201410296969.8A CN201410296969A CN104060525B CN 104060525 B CN104060525 B CN 104060525B CN 201410296969 A CN201410296969 A CN 201410296969A CN 104060525 B CN104060525 B CN 104060525B
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Abstract
The invention provides a kind of steel strand intermediate plate anchor additional anchor device, comprise secondary anchor and be arranged at the reset ring flat-plate between a common anchor and secondary anchor, a common anchor is the anchor device for fixing steel strand be provided with, reset ring flat-plate is provided with the identical reset hole of anchor hole quantity of quantity and an anchor ring, secondary anchor comprises secondary anchor anchor ring and secondary anchoring clamping piece, secondary anchor anchor ring upper bottom surface is provided with groove, the anchor hole quantity identical secondary anchor anchor hole with an anchor ring is in axial direction provided with in groove, secondary anchoring clamping piece arranges a second intermediate plate hole along axis, the inwall in the second intermediate plate hole is provided with thread form sawtooth, the cutting vertically of secondary anchoring clamping piece is symmetrical two parts.The present invention not only achieves common intermediate plate anchor and mends power, and effectively can prevent the slip hidden danger of bowstring arch bridge rigid hanger under the dynamic loadings such as automobile, the secondary anchor ring simultaneously increased is as defence line, rigid hanger steel strand intermediate plate Mao bis-road.
Description
Technical field
The present invention relates to the technical field, particularly rigid hanger steel strand intermediate plate anchor additional anchor device of labour bowstring arch bridge consolidation process and construction.
Background technology
In twentieth century the mid-90, along with the progressively maturation taking OVM series as the prestressed group anchorage technology of representative, owing to adopting prestress wire and supporting intermediate plate anchor, it is without the need to accurate blanking, end is without the need to expanded hole and stretch-draw efficiency height and anchoring convenience etc., avoid two kinds of main presstressed reinforcing steel anchor types such as the finish rolling deformed bar that mainly adopts in bridge boom and parallel wire unit bulb-end anchorage in some existing at that time defects and inconvenience, large quantities ofly adopt the intermediate plate anchor anchoring steel strand without locking device so rise the nineties in last century to have built in the whole nation and carry out the rigid hanger bowstring arch bridge of vertical hole path pressure grouting.
The complexity that rigid hanger avoids rods subitem Multi-stage prestress although bowstring arch bridge adopts, supporting suitable ground tackle is selected, but, the series of problems of common intermediate plate anchor anchoring low stress steel strand is adopted also to expose gradually in engineering construction and bowstring arch bridge are on active service, its subject matter has: in (1) suspension rod the shorter and stretch-draw rear jaw of prestress steel twist line length inside contract the effective follow-up anchoring that directly affects anchor clipper, make anchoring ability not enough; (2) hole path pressure grouting in rigid hanger after prestress wire stretch-draw and cement mortar sealing off and covering anchorage make anchor head intermediate plate gap be filled, and have impact on effective follow-up of intermediate plate when suspension rod load increases thereupon when bridge floor load increases.Above problem has had influence on the operation safety of this type of bridge, and causes serious security incident, as 99 years Qijiang County, Chongqing City bridges collapse, south gate, calendar year 2001 Yibin bridge collapses, Changzhou Yun Cun bridge in 2007 collapses.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of steel strand intermediate plate anchor additional anchor device, present invention also offers tension tool and mounting method that this attachment device is installed.
A kind of rigid hanger steel strand intermediate plate anchor additional anchor device, comprise secondary anchor and be arranged at the reset ring flat-plate between a common anchor and secondary anchor, a common anchor is the anchor device for fixing steel strand be provided with;
Reset ring flat-plate is cylindrical, is arranged on an anchor ring upper bottom surface side, and its diameter is less than an anchor anchor ring diameter, and reset ring flat-plate arranges reset hole, and the quantity of reset hole is identical with the anchor hole quantity of an anchor ring, and the position of reset hole is corresponding with the position of anchor hole;
Secondary anchor comprises secondary anchor anchor ring and secondary anchoring clamping piece, and secondary anchor anchor ring is cylindrical, and its radial diameter is less than an anchor anchor ring radial diameter; Secondary anchor anchor ring side is provided with screw thread, and the bottom surface of secondary anchor anchor ring is arranged at reset ring flat-plate side, and upper bottom surface is provided with groove; Secondary anchor anchor hole is in axial direction provided with in groove, the quantity of secondary anchor anchor hole is identical with the anchor hole quantity of an anchor ring, the position of secondary anchor anchor hole is corresponding with the position of the anchor hole of an anchor ring, secondary anchor anchor hole is divided into the second wire-incoming chamber near secondary anchor anchor ring bottom surface and the second intermediate plate chamber near secondary anchor anchor ring upper bottom surface, second wire-incoming chamber is cylindrical, second intermediate plate chamber is truncated cone-shaped, and secondary anchor anchor hole axial height and the steel strand length be exposed at outside a common anchor are to mating; Secondary time anchoring clamping piece is truncated cone-shaped, gradient is identical with the gradient in the second intermediate plate chamber of secondary anchor anchor ring, the axial height of its axial height and secondary anchor anchor hole is to mating, secondary anchoring clamping piece arranges a second intermediate plate hole along axis, the inwall in the second intermediate plate hole is provided with thread form sawtooth, the cutting vertically of secondary anchoring clamping piece is symmetrical two parts, and secondary anchoring clamping piece is positioned at the second intermediate plate chamber.
A tension tool for rigid hanger steel strand intermediate plate anchor additional anchor device, comprises stretch-draw pressure-bearing ring flat-plate, taper pin, reaction frame, stretch-draw sleeve, jack bearing plate, stretch-draw rod iron, stretch-draw jack;
Stretch-draw pressure-bearing ring flat-plate is provided with upper bottom surface and bottom surface, upper bottom surface is provided with boss, columniform first through hole is provided with in stretch-draw pressure-bearing ring flat-plate, first through-hole wall is provided with the protruding secondary anchor chamber be divided into by first through hole near an anchor chamber of bottom surface and close upper surface, the internal diameter of high spot is less than the external diameter of reset ring flat-plate, the internal diameter in an anchor chamber is identical with an anchor anchor ring external diameter, and secondary anchor chamber internal diameter is identical with secondary anchor anchor ring external diameter; Arrange at least one pair of taper pin groove at the upper bottom surface of stretch-draw pressure-bearing ring flat-plate along the radial direction of the first through hole, often pair of taper pin groove is symmetrical about the first through hole axis, and the degree of depth of taper pin groove can not more than the position of the first through-hole wall projection;
Taper pin is bar-shaped, and front end is provided with inclination angle, and taper pin thickness is less than the degree of depth of taper pin groove, and the quantity of taper pin equals the quantity of taper pin groove, taper pin=through taper pin groove=hold out against with restoring board;
Establish in reaction frame cylindrical second through hole=, the second through hole internal diameter equals the external diameter of stretch-draw pressure-bearing ring flat-plate boss, reaction frame one end be arranged at stretch-draw pressure-bearing ring flat-plate upper bottom surface and outside the boss being stuck in stretch-draw pressure-bearing ring flat-plate;
Stretch-draw sleeve is cylinder, inside establish third channel, third channel inwall is provided with escape, third channel is divided into stretch-draw chamber and No. the second two anchor chambeies by escape, No. the second two times anchor chamber internal diameter is identical with secondary anchor anchor ring external diameter, and No. the second two times anchor cavity wall is provided with screw thread, and the internal diameter in stretch-draw chamber is less than No. the second two anchor chamber internal diameters, stretch-draw cavity wall is provided with screw thread, and stretch-draw sleeve inserts the second through hole of reaction frame and is threaded in secondary anchor anchor ring;
Stretch-draw rod iron comprises rod iron and nut, the diameter of rod iron is less than the diameter of afterbody nut, head rod iron side is provided with screw thread, stretch-draw rod iron head is connected jack bearing plate by stretch-draw cavity wall screw thread with stretch-draw bush whorl and covers at the reaction frame other end, it is provided with third through-hole, and the internal diameter of third through-hole is greater than the external diameter of stretch-draw rod iron head;
Stretch-draw jack is installed on the afterbody that stretch-draw rod iron is exposed at beyond the second through hole and third through-hole.
A mounting method for rigid hanger steel strand intermediate plate anchor additional anchor device, comprises the following steps:
Step 1, clears up the anchor device of tensioning anchor seal, comprises the gap rinsing an anchoring clamping piece with giant, picks the cement paste post-drying of sealing off and covering anchorage in staking gap, exposes steel strand integral and cut;
Step 2, utilizes tension tool to install additional anchor device;
Step 3, the anchoring of steel strand unstress state lower clamping piece;
Step 4, removal tension tool.
The present invention compared with prior art, its remarkable advantage is: (1) attachment device is arranged on stretch-draw end and exposes on steel strand, anchor ring is driven to retreat the anchoring realizing intermediate plate by stretch-draw sleeve, not only achieve common intermediate plate anchor in stretch-draw and mend power, effectively can prevent the slip hidden danger of bowstring arch bridge rigid hanger under the dynamic loadings such as automobile, the secondary anchor ring simultaneously increased is as defence line, rigid hanger steel strand intermediate plate Mao bis-road; (2) clear up because of mud jacking used during sealing off and covering anchorage and cement mortar in duct, intermediate plate gap, when bridge floor load is increased, suspension rod load also increases thereupon, and intermediate plate can effectively follow up.
Steel strand intermediate plate anchor additional anchor device provided by the invention, tension tool and mounting method is described in detail below in conjunction with accompanying drawing.
Accompanying drawing explanation
Fig. 1 is unitary construction schematic diagram of the present invention;
Fig. 2 is reset ring-plane structure schematic diagram;
Fig. 3 is secondary anchor anchor ring structural representation;
Fig. 4 is stretch-draw bearing ring plated construction schematic diagram;
Fig. 5 is stretch-draw tube-in-tube structure schematic diagram;
Fig. 6 is stretch-draw rod iron structural representation.
Detailed description of the invention
Composition graphs 1, a kind of steel strand intermediate plate anchor additional anchor device, comprises secondary anchor and is arranged at the reset ring flat-plate 4 between a common anchor and secondary anchor;
A common anchor is the anchor device for fixing steel strand be provided with, comprise an anchor anchor ring 1 and an anchoring clamping piece 2, No. one time anchor anchor ring 1 is provided with upper bottom surface and bottom surface, in an anchor anchor ring 1, more than one anchor hole is in axial direction set, anchor hole is divided into the wire-incoming chamber near bottom surface and the intermediate plate chamber near upper bottom surface, wire-incoming chamber is cylindrical, and intermediate plate chamber is truncated cone-shaped; One time anchoring clamping piece 2 is truncated cone-shaped, and gradient is identical with the gradient in an anchor anchor ring 1 intermediate plate chamber, and one time anchoring clamping piece 2 arranges an intermediate plate hole along axis, and the inwall in intermediate plate hole is provided with thread form sawtooth, and anchoring clamping piece 2 cutting is vertically symmetrical two parts; Steel strand are successively through the intermediate plate hole of the wire-incoming chamber of an anchor anchor ring 1, intermediate plate chamber and an anchoring clamping piece 2, and an anchoring clamping piece 2 inserts in the intermediate plate chamber of an anchor anchor ring 1 after clipping steel strand;
Composition graphs 2, reset ring flat-plate 4 is cylindrical, and reset ring flat-plate 4 diameter is less than anchor anchor ring 1 diameter; Reset ring flat-plate 4 is provided with the bottom surface near an anchor and the upper bottom surface near secondary anchor, and reset ring flat-plate 4 upper bottom surface edge arranges inclination alpha; Reset ring flat-plate 4 is arranged reset hole 4-1, the quantity of reset hole 4-1 is identical with the anchor hole quantity of an anchor ring 1, and the position of reset hole 4-1 is corresponding with the position of anchor hole, and reset hole is cylindrical, and its internal diameter is greater than the external diameter of steel strand.Wherein the effect of inclination alpha is, when installing additional anchor device, anchoring clamping piece 2 is excessive from an anchor anchor ring 1 to be exited to prevent to need to hold out against reset ring flat-plate 4 with taper pin, therefore reset ring flat-plate 4 upper bottom surface edge and taper pin 5 front end be provided with angle identical and match each other inclination angle, facilitate taper pin 5 to hold out against reset ring flat-plate 4.
Composition graphs 3, secondary anchor comprises secondary anchor anchor ring 6 and secondary anchoring clamping piece 7, and secondary anchor anchor ring 6 is cylindrical, and its diameter is less than anchor anchor ring 1 radial diameter, and its axial height is greater than the length of the steel strand be exposed at outside a common anchor; Secondary anchor anchor ring 6 side is provided with screw thread, and the bottom surface of secondary anchor anchor ring 6 is arranged at reset ring flat-plate 4 side, and secondary anchor anchor ring 6 bottom surface edge arranges angle of inclination beta, and upper bottom surface is provided with groove 6-1; Secondary anchor anchor hole 6-2 is in axial direction provided with in groove 6-1, the quantity of secondary anchor anchor hole 6-2 is identical with the anchor hole quantity of an anchor ring 1, the position of secondary anchor anchor hole 6-2 is corresponding with the position of the anchor hole of an anchor ring 1, secondary anchor anchor hole 6-2 is divided into the second wire-incoming chamber 6-3 near secondary anchor anchor ring bottom surface and the second intermediate plate chamber 6-4 near secondary anchor anchor ring upper bottom surface, second wire-incoming chamber 6-3 is cylindrical, second intermediate plate chamber 6-4 is truncated cone-shaped, and secondary anchor anchor hole 6-2 axial height and the steel strand length be exposed at outside a common anchor are to mating; Secondary time anchoring clamping piece 7 is truncated cone-shaped, gradient is identical with the gradient in the second intermediate plate chamber of secondary anchor anchor ring 6, its axial height is identical with the axial height of secondary anchor anchor hole 6-2, secondary anchoring clamping piece 7 arranges a second intermediate plate hole 7-1 along axis, the internal diameter of the second intermediate plate hole 7-1 is less than the external diameter of steel strand, the inwall of the second intermediate plate hole 7-1 is provided with thread form sawtooth, this thread form sawtooth is that tooth is apart from the closely-pitched sawtooth for 1mm, secondary anchoring clamping piece 7 cutting is vertically symmetrical two parts, during use, secondary anchoring clamping piece 7 is positioned at the second intermediate plate chamber 6-4.Wherein secondary anchor anchor hole 6-2 axial height depends on the steel strand length be exposed at outside a common anchor, the steel strand be exposed at outside a common anchor due to the bowstring arch bridge rigid hanger of tensioning anchor seal are shorter, be generally about 40mm-50mm, therefore, in order to prevent the risk occurring slip in stretching process, the axial height of secondary anchor anchor hole 6-2 is generally arranged between 30-35mm, and the axial height of the second wire-incoming chamber 6-3 is traditionally arranged to be 2mm-3mm.The object that secondary anchor ring 6 upper bottom surface arranges groove has be when install additional anchor device protection steel strand at two: one; Two is the areas increasing secondary anchor ring 6 side, flank threads quantity is increased with this, because secondary anchor anchor hole 6-2 axial height is little, if do not have groove to increase the lateralarea of secondary anchor ring 6, tension operation is carried out after stretch-draw sleeve 9 is threaded with secondary anchor ring, have that stretch-draw sleeve 9 is separated with secondary anchor may, therefore the design of groove 6-1 secondary anchor ring 6 is connected with stretch-draw sleeve 9 more closely, working effect is better.The object that secondary anchor anchor ring 6 bottom surface edge arranges angle of inclination beta is after additional anchor device starts installation, need to hold out against reset ring flat-plate 4 with taper pin 5, prevent anchoring clamping piece 2 excessive exiting from an anchor anchor ring 1, and angle of inclination beta the upper bottom surface edge that taper pin 5 can be facilitated to slide to reset ring flat-plate 4 is set, thus hold out against reset ring flat-plate 4.Secondary anchoring clamping piece 7 axial height should be consistent with the axial height of the second intermediate plate chamber 6-4 in secondary anchor anchor hole 6-2; The object inwall of the second intermediate plate hole 7-1 being arranged the closely-pitched sawtooth that tooth distance is 1mm is, because the axial height of secondary anchoring clamping piece 7 is short, if adopt common thread form sawtooth, after secondary anchoring clamping piece steps up steel strand, may occur the phenomenon of steel strand slip in the process of stretch-draw, and tooth can increase the frictional force between secondary anchoring clamping piece 7 and steel strand apart from the closely-pitched sawtooth for 1mm.
A tension tool for rigid hanger steel strand intermediate plate anchor additional anchor device, is characterized in that, comprise stretch-draw pressure-bearing ring flat-plate 3, taper pin 5, reaction frame 8, stretch-draw sleeve 9, jack bearing plate 10, stretch-draw rod iron 11, stretch-draw jack 12.
Composition graphs 4, stretch-draw pressure-bearing ring flat-plate 3 is provided with upper bottom surface and bottom surface, upper bottom surface is provided with boss 3-4, columniform first through hole 3-1 is provided with in stretch-draw pressure-bearing ring flat-plate 3, first through hole 3-1 inwall is provided with the protruding secondary anchor chamber 3-3 first through hole 3-1 being divided into an anchor chamber 3-2 of close bottom surface and close upper surface, the internal diameter of high spot is less than the external diameter of reset ring flat-plate 4, and the internal diameter of an anchor chamber 3-2 is identical with anchor anchor ring 1 external diameter, and secondary anchor chamber 3-3 internal diameter is identical with secondary anchor anchor ring 6 external diameter; Arrange at least one pair of taper pin groove 3-5 at the upper bottom surface of stretch-draw pressure-bearing ring flat-plate 3 along the radial direction of the first through hole 3-1, often couple of taper pin groove 3-5 is symmetrical about the first through hole 3-1 axis, and the degree of depth of taper pin groove 3-5 can not more than the position of the first through hole 3-1 inwall projection; Wherein the effect of boss 3-4 is the reaction frame 8 being fixedly installed on stretch-draw pressure-bearing ring flat-plate 3 upper bottom surface.
Taper pin 5 is in bar-shaped, and front end is provided with tilt angle gamma, and γ=α, taper pin 5 thickness is less than the degree of depth of taper pin groove 3-5, and the quantity of taper pin equals the quantity of taper pin groove, and taper pin 5 holds out against through taper pin groove 3-5 and restoring board.
Establish cylindrical second through hole 8-1 in reaction frame 8, the second through hole 8-1 internal diameter equals the external diameter of stretch-draw pressure-bearing ring flat-plate 3 boss, reaction frame 8 one end be arranged at stretch-draw pressure-bearing ring flat-plate 3 upper bottom surface and outside the boss being stuck in stretch-draw pressure-bearing ring flat-plate 3.
Composition graphs 5, stretch-draw sleeve 9, in cylinder, is being provided with the second boss away from bottom surface, secondary anchor one end, is convenient to install jack bearing plate 10 in stretching process stressed used; Third channel 9-1 is established in stretch-draw sleeve 9, third channel 9-1 inwall is provided with escape 9-2, third channel 9-1 is divided into stretch-draw chamber 9-3 and the second two No. time anchor chamber 9-4 by escape 9-2, No. the second two times anchor chamber 9-4 internal diameter is identical with secondary anchor anchor ring 6 external diameter, No. the second two times anchor chamber 9-4 inwall is provided with screw thread, the internal diameter of stretch-draw chamber 9-3 is less than No. the second two anchor chamber 9-4 internal diameters, and stretch-draw chamber 9-3 inwall is provided with screw thread, and stretch-draw sleeve 9 inserts the second through hole 8-1 of reaction frame 8 and is threaded in secondary anchor anchor ring 6.
Composition graphs 6, stretch-draw rod iron 11 comprises rod iron 11-1 and nut 11-2, and the diameter of rod iron 11-1 is less than the diameter of afterbody nut 11-2, and head rod iron 11-1 side is provided with screw thread, and stretch-draw rod iron head is threaded with stretch-draw sleeve 9 by stretch-draw chamber 9-3 inner thread; Nut 11-2 can screw in and push, and adapts to drive the stretch-draw of stretch-draw rod iron 11 as the counter-force point of jack in the installation of stretch-draw jack 12 and stretching process.
Composition graphs 1, jack bearing plate 10 covers at reaction frame 8 other end, and it is provided with third through-hole 10-1, and the internal diameter of third through-hole 10-1 is greater than the external diameter of rod iron 11-1.
Composition graphs 1, stretch-draw jack 12 is ordinary jack, is installed on rod iron 11-1 that stretch-draw rod iron 11 is exposed at beyond the second through hole 8-1 and third through-hole 10-1.
A mounting method for rigid hanger steel strand intermediate plate anchor additional anchor device, comprises the following steps:
Step 1, clears up the anchor device of tensioning anchor seal, comprises following operation: the gap rinsing an anchoring clamping piece 2 with giant, picks the cement paste post-drying of sealing off and covering anchorage in staking gap, exposes steel strand integral and cut.
Step 2, utilize tension tool to install additional anchor device, erection sequence is:
Step 2.1, inserts in an anchor chamber 3-2 of stretch-draw pressure-bearing ring flat-plate 3 by upper bottom surface one end of an anchor anchor ring 1;
Step 2.2, reset ring flat-plate 4, through after the reset hole 4-1 on reset ring flat-plate 4, is placed in an anchor anchor ring 1 upper bottom surface side by steel strand;
Step 2.3, steel strand are successively through the secondary anchor anchor hole 6-2 of secondary anchor anchor ring 6 and the second intermediate plate hole 7-1 of secondary anchoring clamping piece 7, and secondary anchoring clamping piece 7 is by jacking second intermediate plate chamber 6-4 pre-after steel strand clamping;
Step 2.4, is installed on the upper bottom surface of stretch-draw pressure-bearing ring flat-plate 3 by reaction frame 8, be stuck in outside boss 3-4;
Step 2.5, inserts in the second through hole 8-1 by stretch-draw sleeve 9, the screw thread that No. the second two times anchor chamber 9-4 inwall is provided with is connected to coupling with the screw thread of secondary anchor anchor ring 6 side;
Step 2.6, covers on the bottom surface of reaction frame 8 away from stretch-draw pressure-bearing ring flat-plate 3 by jack bearing plate 10;
Step 2.7, by the third through-hole 10-1 of stretch-draw rod iron through jack bearing plate 10, and screws in stretch-draw sleeve 9 stretch-draw chamber 9-3;
Step 2.8, is installed on stretch-draw jack 12 on afterbody that stretch-draw rod iron 11 is exposed at beyond the second through hole 8-1 and third through-hole 10-1, and tightening nut 11-2.
Step 3, the anchoring of steel strand unstress state lower clamping piece, detailed process is: the oil cylinder oil inlet of stretch-draw jack 12 drives stretch-draw rod iron 11, stretch-draw sleeve 9 and secondary anchor anchor ring 6 to the motion of stretch-draw jack 12 direction, thus the passive anchoring of secondary anchoring clamping piece 7; In stretching process, stretch-draw limit in limit is knocked taper pin 5 and is held out against multiple ring position plate 4, prevent that anchoring clamping piece 2 is excessive from an anchor anchor ring 1 to be exited, the oil return of stretch-draw post tensioning jack 12 in place oil cylinder, utilizes steel strand automatic retracted to drive 7 to No. the one time anchor direction motion of secondary anchoring clamping piece to realize anchoring.
Step 4, removal tension tool; Stretch-draw rod iron 11 nut 11-2 screws out, stretch-draw jack 12, jack bearing plate 10, reaction frame 8 removal, and stretch-draw sleeve 9 screws out from the special anchor ring 6 of secondary, and taper pin 5 is extracted from taper pin groove 3-5, and stretch-draw pressure-bearing ring flat-plate 3 unloads from secondary anchor anchor ring 6.
embodiment 1
The steel strand diameter that bowstring arch bridge adopts is 15mm, and the length be exposed at outside an anchor is 50mm-60mm; The thickness of the reset ring flat-plate 4 in additional anchor device is 5mm, and the internal diameter of reset hole 4-1 is 18mm, and reset ring flat-plate 4 upper bottom surface edge arranges inclination alpha=15; Secondary anchor anchor ring 6 axial height is 55mm, and the axial height of secondary anchor anchor hole 6-2 is 35mm, and the axial height of the second intermediate plate chamber 6-4 is 32mm, gradient θ=6 in the second intermediate plate chamber, and secondary anchor anchor ring 6 bottom surface edge arranges angle of inclination beta=20; Secondary anchoring clamping piece 7 axial height is 32mm, and the thread form sawtooth in the second intermediate plate hole 7-1 is that tooth is apart from the closely-pitched sawtooth for 1mm.
In tension tool, stretch-draw pressure-bearing ring flat-plate 3 arranges two pairs of taper pin grooves, and the line of centres of first pair of taper pin groove is perpendicular to the line of centres of second pair of taper pin groove, and the degree of depth of each taper pin groove 3-5 is 2cm; Tilt angle gamma=15, taper pin 5 front end.
In mounting method, expose steel strand and be exposed at that length outside an anchor is unified is wholely switched to 50mm.
embodiment 2
The steel strand diameter that bowstring arch bridge adopts is 18mm, and the length be exposed at outside an anchor is 45mm-50mm; The thickness of the reset ring flat-plate 4 in additional anchor device is 6mm, and the internal diameter of reset hole 4-1 is 20mm, and reset ring flat-plate 4 upper bottom surface edge arranges inclination alpha=18; Secondary anchor anchor ring 6 axial height is 50mm, and the axial height of secondary anchor anchor hole 6-2 is 30mm, and the axial height of the second intermediate plate chamber 6-4 is 28mm, gradient θ=7 in the second intermediate plate chamber, and secondary anchor anchor ring 6 bottom surface edge arranges angle of inclination beta=25; Secondary anchoring clamping piece 7 axial height is 28mm, and the thread form sawtooth in the second intermediate plate hole 7-1 is that tooth is apart from the closely-pitched sawtooth for 1mm.
In tension tool, stretch-draw pressure-bearing ring flat-plate 3 arranges two pairs of taper pin grooves, and the line of centres of first pair of taper pin groove is perpendicular to the line of centres of second pair of taper pin groove, and the degree of depth of each taper pin groove 3-5 is 3cm; Tilt angle gamma=18, taper pin 5 front end.
In mounting method, expose steel strand and be exposed at that length outside an anchor is unified is wholely switched to 45mm.
Claims (9)
1. a steel strand intermediate plate anchor additional anchor device, is characterized in that, comprises secondary anchor and is arranged at the reset ring flat-plate (4) between a common anchor and secondary anchor;
A common anchor is the anchor device for fixing steel strand be provided with, and comprises an anchor anchor ring (1) and an anchoring clamping piece (2);
Reset ring flat-plate (4) is cylindrical, its diameter is less than anchor anchor ring (1) diameter, reset ring flat-plate (4) is arranged reset hole (4-1), the quantity of reset hole (4-1) is identical with the anchor hole quantity of an anchor anchor ring (1), and the position of reset hole (4-1) is corresponding with the position of anchor hole;
Secondary anchor comprises secondary anchor anchor ring (6) and secondary anchoring clamping piece (7), and secondary anchor anchor ring (6) is cylindrical, and its diameter is less than anchor anchor ring (1) diameter, secondary anchor anchor ring (6) side is provided with screw thread, and the bottom surface of secondary anchor anchor ring (6) is arranged at reset ring flat-plate (4) side, and upper bottom surface is provided with groove (6-1), secondary anchor anchor hole (6-2) is in axial direction provided with in groove (6-1), the quantity of secondary anchor anchor hole (6-2) is identical with the anchor hole quantity of an anchor anchor ring (1), the position of secondary anchor anchor hole (6-2) is corresponding with the position of the anchor hole of an anchor anchor ring (1), secondary anchor anchor hole (6-2) is divided into the second wire-incoming chamber (6-3) near secondary anchor anchor ring bottom surface and the second intermediate plate chamber (6-4) near secondary anchor anchor ring upper bottom surface, second wire-incoming chamber (6-3) is for cylindrical, second intermediate plate chamber (6-4) is in truncated cone-shaped, secondary anchor anchor hole (6-2) axial height and the steel strand length be exposed at outside a common anchor match, secondary anchoring clamping piece (7) is truncated cone-shaped, gradient is identical with the gradient θ in the second intermediate plate chamber of secondary anchor anchor ring (6), the axial height of its axial height and secondary anchor anchor hole matches, secondary anchoring clamping piece (7) arranges a second intermediate plate hole (7-1) along axis, the inwall in the second intermediate plate hole (7-1) is provided with thread form sawtooth, secondary anchoring clamping piece (7) cutting is vertically symmetrical two parts, and secondary anchoring clamping piece (7) is positioned at the second intermediate plate chamber (6-4),
Described reset ring flat-plate (4) is provided with the bottom surface near an anchor and the upper bottom surface near secondary anchor, and upper bottom surface edge arranges inclination alpha, and reset hole is cylindrical, and its internal diameter is greater than the external diameter of steel strand.
2. steel strand intermediate plate anchor additional anchor device according to claim 1, it is characterized in that, secondary anchor anchor ring (6) bottom surface edge arranges angle of inclination beta.
3. steel strand intermediate plate anchor additional anchor device according to claim 1, is characterized in that, the thread form sawtooth in the second intermediate plate hole (7-1) of secondary anchoring clamping piece (7) is that tooth is apart from the closely-pitched sawtooth for 1mm.
4. one kind is exclusively used in the tension tool of the steel strand intermediate plate anchor additional anchor device described in claims 1 to 3 any one, it is characterized in that, comprise stretch-draw pressure-bearing ring flat-plate (3), taper pin (5), reaction frame (8), stretch-draw sleeve (9), jack bearing plate (10), stretch-draw rod iron (11), stretch-draw jack (12);
Stretch-draw pressure-bearing ring flat-plate (3) is provided with upper bottom surface and bottom surface, upper bottom surface is provided with boss (3-4), columniform first through hole (3-1) is provided with in stretch-draw pressure-bearing ring flat-plate (3), first through hole (3-1) inwall is provided with the protruding secondary anchor chamber (3-3) first through hole (3-1) being divided into an anchor chamber (3-2) of close bottom surface and close upper surface, the internal diameter of high spot is greater than secondary anchor anchor ring (6) external diameter, and the internal diameter of an anchor chamber (3-2) is identical with anchor anchor ring (1) external diameter; At the upper bottom surface of stretch-draw pressure-bearing ring flat-plate (3), at least one pair of taper pin groove (3-5) is set along the radial direction of the first through hole (3-1), often pair of taper pin groove (3-5) is symmetrical about the first through hole (3-1) axis, and the degree of depth of taper pin groove (3-5) can not more than the position of the first through hole (3-1) inwall projection;
Taper pin (5) is in bar-shaped, front end is provided with tilt angle gamma, and γ=α, taper pin (5) thickness is less than the degree of depth of taper pin groove (3-5), the quantity of taper pin equals the quantity of taper pin groove, and taper pin (5) holds out against through taper pin groove (3-5) and reset ring flat-plate;
Cylindrical second through hole (8-1) is established in reaction frame (8), second through hole (8-1) internal diameter equals the external diameter of stretch-draw pressure-bearing ring flat-plate (3) boss, reaction frame (8) one end be arranged at stretch-draw pressure-bearing ring flat-plate (3) upper bottom surface and outside the boss being stuck in stretch-draw pressure-bearing ring flat-plate (3);
Stretch-draw sleeve (9) is in cylinder, inside establish third channel (9-1), third channel (9-1) inwall is provided with escape (9-2), third channel (9-1) is divided into stretch-draw chamber (9-3) and No. the second two anchor chambeies (9-4) by escape (9-2), No. the second two times anchor chamber (9-4) internal diameter is identical with secondary anchor anchor ring (6) external diameter, No. the second two times anchor chamber (9-4) inwall is provided with screw thread, the internal diameter in stretch-draw chamber (9-3) is less than No. the second two anchor chamber (9-4) internal diameters, stretch-draw chamber (9-3) inwall is provided with screw thread, stretch-draw sleeve (9) inserts second through hole (8-1) of reaction frame (8) and is threaded with secondary anchor anchor ring (6),
Stretch-draw rod iron (11) comprises rod iron (11-1) and nut (11-2), the diameter of rod iron (11-1) is less than the diameter of afterbody nut (11-2), rod iron (11-1) head side is provided with screw thread, and stretch-draw rod iron head is threaded with stretch-draw sleeve (9) by stretch-draw chamber (9-3) inner thread;
Jack bearing plate (10) covers at reaction frame (8) other end, and it is provided with third through-hole (10-1), and the internal diameter of third through-hole (10-1) is greater than the external diameter of rod iron (11-1);
Stretch-draw jack (12) is installed on the rod iron (11-1) that stretch-draw rod iron (11) is exposed at beyond the second through hole (8-1) and third through-hole (10-1).
5. the tension tool of steel strand intermediate plate anchor additional anchor device according to claim 4, it is characterized in that, stretch-draw pressure-bearing ring flat-plate (3) is arranged two pairs of taper pin grooves, and the line of centres of first pair of taper pin groove is perpendicular to the line of centres of second pair of taper pin groove.
6. a mounting method for a kind of steel strand intermediate plate anchor additional anchor device as claimed in claim 1, is characterized in that, comprise the following steps:
Step 1, clears up the anchor device of tensioning anchor seal;
Step 2, utilizes tension tool to install additional anchor device;
Step 3, the anchoring of steel strand unstress state lower clamping piece;
Step 4, removal tension tool.
7. the mounting method of steel strand intermediate plate anchor additional anchor device according to claim 6, it is characterized in that, step 1 comprises following operation: the gap rinsing an anchoring clamping piece (2) with giant, picks the cement paste post-drying of sealing off and covering anchorage in staking gap, exposes steel strand integral and cut.
8. the mounting method of steel strand intermediate plate anchor additional anchor device according to claim 6, it is characterized in that, the erection sequence of step 2 is:
Step 2.1, inserts in an anchor chamber (3-2) of stretch-draw pressure-bearing ring flat-plate (3) by upper bottom surface one end of an anchor anchor ring (1);
Step 2.2, reset ring flat-plate (4), through after the reset hole (4-1) on reset ring flat-plate (4), is placed in anchor anchor ring (1) upper bottom surface side by steel strand;
Step 2.3, steel strand are successively through secondary anchor anchor hole (6-2) and the second intermediate plate hole (7-1), and secondary anchoring clamping piece (7) is by jacking second intermediate plate chamber (6-4) pre-after steel strand clamping;
Step 2.4, is installed on reaction frame (8) on stretch-draw pressure-bearing ring flat-plate (3);
Step 2.5, to insert stretch-draw sleeve (9) in the second through hole (8-1) and to screw with the screw thread of secondary anchor anchor ring (6) side;
Step 2.6, is placed in jack bearing plate (10) on reaction frame (8);
Step 2.7, by the third through-hole (10-1) of stretch-draw rod iron through jack bearing plate (10), and screws in stretch-draw chamber (9-3);
Step 2.8, is installed on stretch-draw jack (12) on stretch-draw rod iron (11).
9. the mounting method of steel strand intermediate plate anchor additional anchor device according to claim 6, it is characterized in that, the detailed process of step 3 steel strand unstress state lower clamping piece anchoring is: stretch-draw jack (12) oil cylinder oil inlet drives stretch-draw rod iron (11), stretch-draw sleeve (9) and secondary anchor anchor ring (6) to the motion of stretch-draw jack (12) direction, thus secondary anchoring clamping piece (7) passive anchoring; In stretching process, stretch-draw limit in limit is knocked taper pin (5) and is held out against multiple ring position plate (4), the oil cylinder oil return of stretch-draw post tensioning jack (12) in place, utilizes steel strand automatic retracted to drive secondary anchoring clamping piece (7) to realize anchoring to an anchor direction motion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410296969.8A CN104060525B (en) | 2014-06-28 | 2014-06-28 | Steel strand intermediate plate anchor additional anchor device, tension tool and mounting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410296969.8A CN104060525B (en) | 2014-06-28 | 2014-06-28 | Steel strand intermediate plate anchor additional anchor device, tension tool and mounting method |
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| CN104060525A CN104060525A (en) | 2014-09-24 |
| CN104060525B true CN104060525B (en) | 2016-04-13 |
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| CN112095924A (en) * | 2020-08-03 | 2020-12-18 | 马鞍山市顺泰稀土新材料有限公司 | Additional anchoring mechanism for steel strand clamping piece anchor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE19801786A1 (en) * | 1998-01-19 | 1999-07-29 | Suspa Spannbeton Gmbh | Anchor system for tensioners and anchors in prestressed concrete construction |
| FR2794484B1 (en) * | 1999-06-03 | 2001-08-03 | Freyssinet Int Stup | DEVICE FOR ANCHORING A STRUCTURAL CABLE |
| FR2798409B1 (en) * | 1999-09-15 | 2002-01-04 | Freyssinet Int Stup | SYSTEM FOR CONNECTING A CABLE TO A BUILDING STRUCTURE |
| CN2900617Y (en) * | 2006-06-13 | 2007-05-16 | 四川路桥建设股份有限公司 | Double regulating cable low stress clamp sheet anchoring system |
| CN201137251Y (en) * | 2007-12-19 | 2008-10-22 | 中铁大桥局集团第一工程有限公司 | Cable rope clamping piece loose-proof device |
| CN201296899Y (en) * | 2008-06-16 | 2009-08-26 | 江阴法尔胜住电新材料有限公司 | Anti-corrosive structure of anchor device |
| CN204199167U (en) * | 2014-06-28 | 2015-03-11 | 江苏省交通科学研究院股份有限公司 | The tension tool of steel strand intermediate plate anchor additional anchor device and installation anchor device |
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