CN1296590C - Outer prestress system and its construction process - Google Patents
Outer prestress system and its construction process Download PDFInfo
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- CN1296590C CN1296590C CNB021404798A CN02140479A CN1296590C CN 1296590 C CN1296590 C CN 1296590C CN B021404798 A CNB021404798 A CN B021404798A CN 02140479 A CN02140479 A CN 02140479A CN 1296590 C CN1296590 C CN 1296590C
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Abstract
The present invention relates to an outer prestress system which comprises an anchoring subsection I which is composed of an anchoring head and an anchoring part, a free subsection II and a steering subsection III, wherein a steering device of the steering subsection is composed of a steering tube provided with deflection tubes. 2 to 120 deflection tubes which are mutually parallel are positioned in the steering tube. The deflection tubes are connected integrally by connecting plates. The deflection tube has certain toughness and flexibility. The anchoring subsection I is an anchoring system which adopts a moveable bush type clip sheet anchor. The free subsection is composed of an outer sleeve and a rope body provided with a protective outer sleeve. A proper position of the rope body is provided with a single hold-down type vibration damper. A construction method of the outer prestress system comprise the following steps: the subsections are prefabricated, the steering device is installed, the anchoring head is installed, the single rope body is stretched, slurry is poured, the operation of corrosion prevention is performed, the vibration damper and a PE sleeve tube are installed, etc. The system has the advantages that the single rope body is stretched and is replaced, a steel strand is uniformly stressed, the service life is long, the construction method is simple and convenient, the working period is short and the construction cost is low, etc.
Description
One, technical field:
The present invention relates to a kind of prestress system, particularly a kind of external prestressing system and job practices thereof.
Two, background technology:
The external prestressing system comprises anchoring sections I, several free sections II of partly being made up of anchor head and anchoring at two ends, several turn to sections III, its main part has: 1, external prestressing cable wire and guard system thereof, 2, the transfer of external prestressing, 3, the anchor system of external prestressing cable wire; 4, external prestressing shock absorber; The external prestressing cable wire and the guard system thereof of existing system mainly contain following two kinds: first kind: adopt the form of plain bar twisted wire, PE sleeve pipe cement grouting, cement paste ftractures under the dynamic load effect easily, and antiseptic effect is bad; Second kind: adopt the form of cement grouting in unbonded tendon, the PE sleeve pipe, this system elder generation cement grouting post tensioning, unbonded tendon is overlapping easily like this, discontinuity, and can't singlely change rope; These two kinds of forms all need grouting, and the cycle is longer, and cost is higher; Secondly, the steering gear in the existing external tendon prestress system only is made of a steering tube, when steel strand pass steering gear, steel strand and steel strand overlap easily, can cause steel strand to beat strand, and cause every steel strand discontinuity, bring hidden danger to construction quality; When cable body produces vibration, produce friction between steel strand and steering gear, steel strand and the steel strand, influence the application life of cable body, and this kind steering gear can not realize the single rope that changes; The 3rd, described anchoring sections generally partly is made up of anchor head and anchorage zone two, and anchor head part presstressed reinforcing steel passes anchor slab by the intermediate plate anchoring, forms dual anchoring in the anchorage zone by the bond stress with the grouting agent generation; When prestressed cable corrosion or the destroyed needs replacing of its overcoat rope, need to destroy the concrete of anchorage zone, prestressed cable two ends in the anchoring system, change anchor plate, even spiral bar, therefore its workload of changing rope is big, the difficulty height, work period is long, the 4th, at free sections, the one, protective coat is a whole piece, can not open, be not easy to carry out the detection of Suo Li and the inspection of anticorrosion state, the 2nd, adopt integral vibration damping device vibration damping, before mounting dampers, cable body will be installed earlier shrink fastener, construction is comparatively complicated, owing to can not tighten up fully between cable body, still exist the gap between rope and the rope, the DeGrain of vibration damping.
Three, summary of the invention:
Technical problem to be solved by this invention is: exist in the existing external prestressing system: 1, external prestressing cable wire and guard system thereof all need grouting, from great, be difficult for single tendon stretch, the single rope that changes, construction period is longer; 2, produce friction between steel strand and steering gear, steel strand and the steel strand, influence the application life of cable body and can not realize single tendon stretch, the single rope that changes; 3, when prestressed cable corrosion or its overcoat are destroyed when needing to change rope, need to destroy the concrete of anchorage zone, prestressed cable two ends in the anchoring system, change anchor plate even spiral bar, its workload of changing rope is big, difficulty is high; The problem of aspects such as 4, protective coat is whole piece, can not opens, and is not easy to carry out the detection of Suo Li and the inspection of anticorrosion state, and integral vibration damping device effectiveness in vibration suppression is not obvious.
Its technical scheme of dealing with problems is: 1, the protective coat of free sections adopts segmented, use large and small different pipeline, tubule can stretch in the bassoon, be connected with bolt between large pipeline and the small pipeline, need not be in the milk between the cable body of free sections and the protective coat, and change shock absorber into the single vibration damping form that compresses; 2, select the steering gear of tape guide pipe for use, 2～120 guide pipes that are parallel to each other are arranged in the steering tube of this steering gear, fuse by 3～7 junction plates between each root guide pipe and guarantee the parallel of steel strand and steel strand position with this, every steel strand are stressed evenly, reduce the fretting wear between steel strand and the steering gear, and can carry out the single rope that changes; 3, increase an interchangeable pillar and gasket ring in traditional anchor plate, interchangeable pillar stretches out outside the anchor plate.
Its concrete structure is: a kind of external prestressing system, comprise the anchoring sections I, the free sections II that partly form by anchor head and anchoring, turn to sections III, described free sections II is made up of the cable body that is with protective coat outward, the cable body of free sections II the appropriate location shock absorber is installed, it is characterized in that: the protective coat of the free sections of described external prestressing system adopts large and small different pipeline, tubule can stretch in the bassoon, be connected with bolt between large pipeline and the small pipeline, need not be in the milk between the cable body of free sections and the protective coat.
Described to turn to the steering gear of sections III be to be made of guide pipe, steering tube, junction plate, and 2～120 guide pipes that are parallel to each other are positioned at steering tube, fuse by junction plate between each root guide pipe;
Described guide pipe is the guide pipe that certain rigidity and suppleness are arranged, there are 3 to regulate bolts on the circumference of the described junction plate that is positioned at steering tube middle part, be socketed with the guide pipe error compensator identical in the junction plate at two ends with guide pipe quantity, this guide pipe error compensator is a tubular, it is tubaeform being positioned at the steering tube mouth of pipe one end, the inside of an end that links to each other with junction plate has a step, and each root guide pipe is stuck on the step.
As a kind of conversion of the present invention, described guide pipe with certain rigidity and suppleness is to adopt polyethylene or high density polyethylene (HDPE) or high-density polystyrene or polyvinyl chloride or polytetrafluoroethylene (PTFE) or PVC and so on plastic material or engineering elastomeric material, three layers or two-layer compound direction pipe that intermediate course adopts bellows or metal webmaster or flexible metal thin layer to constitute.
As another feature of the present invention, described anchoring sections is the anchoring system that adopts bush type intermediate plate anchor, and this system has added one deck protective casing in the common anchor backing plate, be in the milk between protective casing and cable body.
As another feature of the present invention, the cable body of free sections II the shock absorber installed of appropriate location be single compression type shock absorber, this shock absorber is by two semicircle oversheaths, 4～20 damping pads, the sheath ear, connecting bolt constitutes, the both sides of the damping pad in the middle of described being positioned at respectively have the groove of circular arc, the groove butt joint of the circular arc of adjacent two pads is circular, the damping pad of adjacent oversheath has the groove of circular arc on one side, the circular arc of another side for matching with circular oversheath, two semicircle oversheath butt joints, fuse by bolt and nut, described damping pad can be made with rubber, also can have certain flexible plastics or fibrous material is made with other.
The job practices of above-mentioned external prestressing system is characterized in that: it comprises following key step:
A: steering gear is installed:
(1) assembling guide pipe and middle connecting plate passes middle connecting plate with guide pipe, again at guide pipe two ends alignment error expansion loop, treat that whole guide pipes all pass middle connecting plate after, regulate bolts for three that regulate on the middle connecting plate, integral body is put into steering tube,
(2) mounting end junction plate;
B: precast segment:
(1) respectively anchor plate is put spiral bar and pre-pipe laying is embedded in the anchoring sections, the steering tube of steering gear is embedded in the steering gear sections,
(2) each sections of maintenance;
C: grouting: the space grout injection between steering tube inside, guide pipe;
D: anchor head is installed:
(1) protective coat is put into the free sections of external tendon,
(2) reeve and pretension: steel strand one end is passed protective coat, steering gear, protective coat, steering gear, protective coat, neck bush, anchor slab, protective cover from top to bottom successively from free sections, again the steel strand other end is passed neck bush, anchor slab, put into intermediate plate and carry out anchoring and pretension, in the process of reeving, put on one with regard to one of pretension;
E: single tendon stretch: each the root steel strand that adopts jack pair to form rope are implemented single tendon stretch;
F: grouting and anticorrosion:
(1) cement injection mortar or epoxy mortar in the neck bush of anchored end;
(2) the anchored end anchor head is anticorrosion: excise unnecessary steel strand, build protective cover, and pour into grease or cement mortar in protective cover, also can pour into epoxy mortar;
G: mounting dampers on request;
H:, connect with bolt with the protective coat installation in position.
The present invention's external prestressing system and job practices thereof have the following advantages:
One, at the anchoring sections:
(1) need not to chisel structural member and just can directly change cable body and relevant consumable accessory thereof, structural member is not almost had destruction, and it is easy to change rope, workload is little than traditional form, and the work period is short, reduces engineering cost;
(2) gap between anchor plate and interchangeable pillar is little, when the intermediate plate anchoring was lost efficacy, interchangeable pillar and the coniform paste materials of fixed all-in-one-piece take place vertically micro-displacement contact with the anchor plate inner chamber back produce a wedging effect with load transfer to structure, simultaneously interchangeable pillar to the reaction force of paste materials increased paste materials to the bond stress of cable body, kept the effect of its dual anchoring, thereby having increased the anchoring property and the integrally-built stability of rope greatly, the performance of operating condition of whole rope is more stable.
Two: turn to sections: the present invention selects the steering gear of tape guide pipe for use, 2～120 guide pipes that are parallel to each other are arranged in the steering tube of this steering gear, steel strand pass from guide pipe, remove to have to guarantee the parallel of steel strand and steel strand position, guarantee that every steel strand are stressed even; At utmost reduced steel strand, steering gear between wearing and tearing, application life of having improved external tendon and total; Can carry out single changing outside the rope, also have the following advantages: 1, select guide pipe for use, both can increase the ability of bearing pressure of guide pipe, guarantee that steel strand are not extruded damage, convenient again the installation with certain rigidity and suppleness; 2, can change the needs of shape arbitrarily at level and vertical both direction with the steering tube that adapts to different directions, differently curved radius; 3, the junction plate of employing adjustable position can be under the situation that does not change the steering tube arc, the relative position of regulating junction plate and steering tube by the bolt of adjusting junction plate reaches the purpose of the bend radius of change guide pipe, to remedy the defective that steering tube is made, thereby play the effect of fine setting steel strand radian, to adapt to the needs of site operation; 4, the mouth of pipe at guide pipe increases the rigidity that a guide pipe error compensator increases guide pipe on the one hand, makes things convenient for the trend of steel strand on the other hand, guarantees that steel strand do not produce the stress concentration phenomenon.
Three, free sections:
The protective coat of the free sections of described external tendon adopts large and small different pipeline, be connected with bolt between large pipeline and the small pipeline, for convenience detach, need not be in the milk between the cable body of free sections and the protective coat, small pipeline can import in the large pipeline, can detect situations such as the Suo Li of cable body of free sections and anticorrosion state at any time, large and small sleeve pipe plays the protection unbonded tendon and is not subjected to extraneous destruction; Change the integral vibration damping device into the single vibration damping form that compresses, the better and easy construction of effectiveness in vibration suppression.
Four, description of drawings:
Fig. 1: the present invention's external prestressing architectural schematic;
The partial enlarged drawing of Fig. 2: Fig. 1;
Fig. 3: the steering gear structural representation of external prestressing system of the present invention;
The A of Fig. 4: Fig. 3 is to view;
The B-B view of Fig. 5: Fig. 3;
Fig. 6: 3 layers of guide pipe structural representation (sectional view);
Fig. 7: 2 layers of guide pipe structural representation (sectional view);
Fig. 8: the loose bush formula intermediate plate anchor structure schematic diagram of external prestressing system implementation example two of the present invention;
Fig. 9: the single compression type damper structure schematic diagram of external prestressing system of the present invention;
The C of Figure 10: Fig. 9 is to view;
Figure 11: external prestressing system construction process figure of the present invention.
Five: the specific embodiment:
Embodiment one:
A kind of external prestressing system comprises that two anchoring sections I at two ends, two turn to sections III and at anchoring sections I with turn to the joint of three between the sections free sections II (referring to Fig. 1, Fig. 2);
Described anchoring sections I partly is made up of anchor head and anchorage zone two, and anchor head partly comprises cable body seal closure 1, anchor slab 3, intermediate plate 2, and the anchorage zone comprises spiral bar 4, anchor plate 5, neck bush 6, pre-pipe laying 7, grouting agent 14, sealing plate 12;
Described free sections II is made up of the cable body 11 that is with protective coat 8 outward, it is that raw material is strengthened antiseptic epoxy and sprayed unbonded tendon entirely as prestressed reinforcement that described cable body 11 is selected for use with the high strength steel strand, described protective coat 8 can be the PE sheath, it also can be steel pipe, pvc pipe, the protective coat 8 of the free sections of described external prestressing system adopts big, little different pipeline, tubule can stretch in the bassoon, be connected with bolt between large pipeline and the small pipeline, need not be in the milk between the cable body of free sections and the protective coat, the cable body of free sections II the appropriate location shock absorber 9 is installed;
The described steering gear 10 that turns to sections III is that the steering tube by the tape guide pipe constitutes, 7 guide pipes that are parallel to each other 21 are positioned at steering tube 22, fuse by 3 junction plates 23 between each root guide pipe, described guide pipe is the guide pipe with certain rigidity and suppleness, the described junction plate 23 that is positioned at the steering tube middle part
1Circumference on have 3 to regulate bolts 23
11, the junction plate 23 at two ends
2In be socketed with the guide pipe error compensator 25 identical with guide pipe quantity, this guide pipe error compensator 25 is a tubular, it is tubaeform being positioned at the steering tube mouth of pipe one end, the inside of an end that links to each other with junction plate has a step, each root guide pipe is stuck on the step, irritate in space between guide pipe 21 and the steering tube 22 cement paste, epoxy resin or some other inserts 24, and guarantee to be full of, closely knit (referring to Fig. 3, Fig. 4, Fig. 5).
A kind of conversion as the embodiment of the invention one, described guide pipe with certain rigidity and suppleness is to adopt polyethylene or high density polyethylene (HDPE) or high-density polystyrene or polyvinyl chloride or polytetrafluoroethylene (PTFE) or PVC and so on plastic material or engineering elastomeric material, three layers or two-layer clad pipe that intermediate course adopts bellows or metal webmaster or flexible metal thin layer to constitute, the quantity of guide pipe can have 2～120, and the quantity of junction plate can be 3～7 (referring to Fig. 6, Fig. 7).Among Fig. 1,13 is member.
As a kind of conversion of the embodiment of the invention one, also can be without the steering gear of said structure.
Embodiment two:
A kind of external prestressing system, its basic structure is with embodiment one, institute's difference is: described anchoring sections I is a loose bush formula intermediate plate anchor, its anchor head partly also has a gasket ring 27, one interchangeable pillar 28 is arranged in the anchor plate 5, these interchangeable pillar 28 big ends stretch out anchor plate 5, described gasket ring 27 is enclosed within on the big end of interchangeable pillar 28, be interference fits with interchangeable pillar 28, interchangeable pillar 28 can move vertically, gasket ring 27 is by the end face of screw at anchor plate 5, sealing plate 12 is installed in the small end (referring to Fig. 8) of interchangeable pillar 28, and described interchangeable pillar 28 is by steel plate, the metalloid material of aluminium sheet or polytetrafluoroethylene (PTFE) or polyethylene or high density polyethylene (HDPE) and so on plastic material is made.
Embodiment three:
A kind of external prestressing system, its basic structure are with embodiment one or embodiment two, and institute's difference is: the cable body of free sections II the shock absorber 9 installed of appropriate location are single compression type shock absorber (referring to Fig. 9, Figure 10); This shock absorber is by two semicircle oversheaths 29
1, 29
2, 6 damping pads 30
1, 30
2... 30
6, sheath ear 31, connecting bolt 33 constitute the damping pad 30 in the middle of described being positioned at
2, 30
3, 30
4, 30
5Both sides respectively have the groove of circular arc, the groove butt joint of the circular arc of adjacent two pads is circular, the damping pad 30 of adjacent oversheath
1, 30
6Have groove, the circular arc of another side of circular arc on one side, two semicircle oversheaths 29 for matching with circular oversheath
1, 29
2Butt joint fuses by bolt 33 and nut 32, and described damping pad can be made with rubber, also can have certain flexible plastics or fibrous material is made with other.
As a kind of conversion of the embodiment of the invention, the quantity of described damping pad is decided according to the quantity of the rope of protection cable body, generally has 4～20.
As a kind of conversion of the embodiment of the invention, in the various embodiments described above, the quantity of free sections II can for 2～60, turn to the quantity of sections III can have 1～60.
Embodiment four: the job practices of above-mentioned external prestressing system, and it comprises following key step:
A: steering gear 10 is installed:
(1) assembling guide pipe 22 and middle connecting plate 23 pass middle connecting plate 23 with guide pipe 22
1, again at guide pipe two ends alignment error expansion loop 25, treat that whole guide pipes all pass middle connecting plate after, regulate bolts 23 for three that regulate on the middle connecting plate
11, integral body is put into steering tube,
(2) the mounting end junction plate 23
2,
B: precast segment:
(1) respectively anchor plate 5 is put spiral bar 4 and pre-pipe laying 7 is embedded in the anchoring sections, the steering tube 22 of steering gear 10 is embedded in turns to sections,
(2) each sections of maintenance;
C: grouting: the space cement injection mortar 24 between steering tube 22 inside, guide pipe 21;
D: anchor head is installed:
(1) protective coat 8 is put into the free sections of external tendon,
(2) reeve and pretension: steel strand one end is passed protective coat 8, steering gear 10, protective coat 8, steering gear 10, shock absorber 9, neck bush 6 or interchangeable pillar 28, anchor slab 3 from top to bottom successively from free sections, again the steel strand other end is passed neck bush 6 or interchangeable pillar 28, anchor slab 3, put into intermediate plate 2 and carry out anchoring and pretension, in the process of reeving, put on one with regard to one of pretension;
E: single tendon stretch: each the root steel strand that adopts jack pair to form rope are implemented single tendon stretch;
F: grouting and anticorrosion:
(1) cement injection mortar or epoxy mortar 14 in the neck bush 6 of anchored end or interchangeable pillar 28;
(2) anchor head of anchored end is anticorrosion, excises unnecessary steel strand, builds protective cover 1, and pours into grease or cement mortar in protective cover 1, also can pour into epoxy mortar;
G: mounting dampers 9 on request;
H:, connect with bolt with protective coat 8 installation in position.
Claims (7)
1, a kind of external prestressing system, comprise the anchoring sections I, the free sections II that partly form by anchor head and anchoring, turn to sections III, described free sections II is made up of the cable body that is with protective coat (8) outward (11), the cable body of free sections II the appropriate location shock absorber (9) is installed, it is characterized in that: the protective coat of the free sections of described external prestressing system adopts large and small different pipeline, tubule can stretch in the bassoon, be connected with bolt between large pipeline and the small pipeline, need not be in the milk between the cable body of free sections and the protective coat.
2, described external prestressing system as claimed in claim 1, it is characterized in that: the described steering gear (10) that turns to sections III is to be made of guide pipe (21), steering tube (22), junction plate (23), 2～120 guide pipes that are parallel to each other (21) are positioned at steering tube (22), fuse by junction plate (23) between each root guide pipe (21).
3, described external prestressing system as claimed in claim 2 is characterized in that: the guide pipe (21) of described steering gear (10) is the guide pipe (21) that certain rigidity and suppleness are arranged, the described junction plate (23 that is positioned at steering tube (21) middle part
1) circumference on have 3 to regulate bolts, the junction plate (23 at two ends
2) in be socketed with the guide pipe error compensator (25) identical with guide pipe quantity, this guide pipe error compensator is a tubular, it is tubaeform being positioned at the steering tube mouth of pipe one end, the inside of an end that links to each other with junction plate has a step, each root guide pipe is stuck on the step, described guide pipe (21) with certain rigidity and suppleness is to adopt polyethylene or high density polyethylene (HDPE) or high-density polystyrene or polyvinyl chloride or polytetrafluoroethylene (PTFE) or PVC and so on plastic material or engineering elastomeric material, three layers or two-layer compound direction pipe that intermediate course adopts bellows or metal webmaster or flexible metal thin layer to constitute.
4, as claim 1 or 2 or 3 described external prestressing systems, it is characterized in that: the anchoring sections I of described external prestressing system is the anchoring system that adopts bush type intermediate plate anchor, it has a gasket ring (27), one interchangeable pillar (28) is arranged in the anchor plate (5), the big end of this interchangeable pillar (28) stretches out anchor plate (5), described gasket ring is enclosed within on the big end of interchangeable pillar (28), be interference fits with interchangeable pillar (28), interchangeable pillar (28) can move vertically, gasket ring (27) is by the end face of screw in anchor plate (5), sealing plate (12) is installed in the small end of interchangeable pillar (28), and described interchangeable pillar (28) is by steel plate, the metalloid material of aluminium sheet or polytetrafluoroethylene (PTFE) or polyethylene or high density polyethylene (HDPE) and so on plastic material is made.
5, as claim 1 or 2 or 3 described external prestressing systems, it is characterized in that: the cable body of free sections II the shock absorber (9) installed of appropriate location be single compression type shock absorber, this shock absorber is by two semicircle oversheaths (29
1), (29
2), 4～20 damping pads (30
1), (30
2) ..., (30
20), sheath ear (31), connecting bolt (33) constitute the damping pad (30 in the middle of described being positioned at
2), (30
3), (30
4) ..., (30
19) both sides respectively have the groove of circular arc, the groove butt joint of the circular arc of adjacent two pads is circular, the damping pad (30 of adjacent oversheath
1), (30
20) have on one side groove, the circular arc of another side of circular arc, two semicircle oversheaths (29 for matching with circular oversheath
1), (29
2) butt joint, fusing by bolt (33) and nut (32), described damping pad can be made with rubber, also can have certain flexible plastics or fibrous material is made with other.
6, described external prestressing system as claimed in claim 4 is characterized in that: the cable body of free sections II the shock absorber (9) installed of appropriate location be single compression type shock absorber, this shock absorber is by two semicircle oversheaths (29
1), (29
2), 4～20 damping pads (30
1), (30
2) ..., (30
20), sheath ear (31), connecting bolt (33) constitute the damping pad (30 in the middle of described being positioned at
2), (30
3), (30
4) ..., (30
19) both sides respectively have the groove of circular arc, the groove butt joint of the circular arc of adjacent two pads is circular, the damping pad (30 of adjacent oversheath
1), (30
20) have on one side groove, the circular arc of another side of circular arc, two semicircle oversheaths (29 for matching with circular oversheath
1), (29
2) butt joint, fusing by bolt (33) and nut (32), described damping pad can be made with rubber, also can have certain flexible plastics or fibrous material is made with other.
7, a kind of job practices of external prestressing system is characterized in that: it comprises following key step:
A: steering gear is installed:
(1) assembling guide pipe and middle connecting plate passes middle connecting plate with guide pipe, again at guide pipe two ends alignment error expansion loop, treat that whole guide pipes all pass middle connecting plate after, regulate bolts for three that regulate on the middle connecting plate, integral body is put into steering tube,
(2) mounting end junction plate;
B: precast segment:
(1) respectively anchor plate is put spiral bar and pre-pipe laying is embedded in the anchoring sections, the steering tube of steering gear is embedded in the steering gear sections,
(2) each sections of maintenance;
C: grouting: the space grout injection between steering tube inside, guide pipe;
D: anchor head is installed:
(1) protective coat is put into the free sections of external tendon,
(2) reeve and pretension: steel strand one end is passed protective coat, steering gear, protective coat, steering gear, protective coat, neck bush, anchor slab, protective cover from top to bottom successively from free sections, again the steel strand other end is passed neck bush, anchor slab, put into intermediate plate and carry out anchoring and pretension, in the process of reeving, put on one with regard to one of pretension;
E: single tendon stretch: each the root steel strand that adopts jack pair to form rope are implemented single tendon stretch;
F: grouting and anticorrosion:
(1) cement injection mortar or epoxy mortar in the neck bush of anchored end;
(2) the anchored end anchor head is anticorrosion: excise unnecessary steel strand, build protective cover, and pour into grease or cement mortar in protective cover, also can pour into epoxy mortar;
G: mounting dampers on request;
H:, connect with bolt with the protective coat installation in position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021404798A CN1296590C (en) | 2002-07-16 | 2002-07-16 | Outer prestress system and its construction process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021404798A CN1296590C (en) | 2002-07-16 | 2002-07-16 | Outer prestress system and its construction process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1469058A CN1469058A (en) | 2004-01-21 |
| CN1296590C true CN1296590C (en) | 2007-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021404798A Expired - Lifetime CN1296590C (en) | 2002-07-16 | 2002-07-16 | Outer prestress system and its construction process |
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| CN (1) | CN1296590C (en) |
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| US4878327A (en) * | 1987-03-13 | 1989-11-07 | Dyckerhoff & Widmann Aktiengesellschaft | Corrosion protected tension member for use in prestressed concrete and method of installing same |
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| CN2443076Y (en) * | 2000-09-04 | 2001-08-15 | 柳州市建筑机械总厂 | Prestress external anchoring device |
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| US4878327A (en) * | 1987-03-13 | 1989-11-07 | Dyckerhoff & Widmann Aktiengesellschaft | Corrosion protected tension member for use in prestressed concrete and method of installing same |
| CN2305449Y (en) * | 1997-07-16 | 1999-01-27 | 中外合资柳州欧维姆建筑机械有限公司 | Prestress anchor |
| CN2443076Y (en) * | 2000-09-04 | 2001-08-15 | 柳州市建筑机械总厂 | Prestress external anchoring device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101372827B (en) * | 2007-08-23 | 2011-07-27 | 柳州欧维姆机械股份有限公司 | Axial vibration damping system for stayed cable, stayed cable equipped with the system and manufacturing method thereof |
| CN110295551A (en) * | 2019-08-09 | 2019-10-01 | 中国建筑第四工程局有限公司 | Continuous rigid frame bridge external prestressing strengthening structure |
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|---|---|
| CN1469058A (en) | 2004-01-21 |
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