CN104060535A - Prestress high-strength twisted steel anchoring system and construction method - Google Patents
Prestress high-strength twisted steel anchoring system and construction method Download PDFInfo
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- CN104060535A CN104060535A CN201410322698.9A CN201410322698A CN104060535A CN 104060535 A CN104060535 A CN 104060535A CN 201410322698 A CN201410322698 A CN 201410322698A CN 104060535 A CN104060535 A CN 104060535A
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Abstract
A prestress high-strength twisted steel anchoring system comprises prestress high-strength twisted steel, a nut screwed on the prestress high-strength twisted steel and anchoring base plates. A base plate and an insulation base plate are arranged on the part, between the nut and the anchoring base plates, on the prestress high-strength twisted steel in a sleeved mode, a plastic corrugate pipe is arranged on the outer portion, between the anchoring base plates at the two ends, on the prestress high-strength twisted steel in a sleeved mode, a spiral rib is arranged below the anchoring base plates at the two ends, a thermal shrinkable sleeve is arranged at the seam of the anchoring base plates and the plastic corrugate pipe in a sleeved mode, a sealing cover is arranged on the outer side of the anchoring base plates at the two ends, and after tensioning is completed, cement paste is injected between the plastic corrugate pipe and the prestress high-strength twisted steel. The prestress high-strength twisted steel is formed by a steel bar with a large pitch and continuous full threads in a cold extrusion mode, and the continuous full threads are continuous threads with the cross sections of the threads in a trapezoid-like shape. According to the prestress high-strength twisted steel anchoring system, the section area of the threads of the prestress high-strength twisted steel can be effectively enlarged, the adhesion strength of the steel bar and concrete is enhanced, so that the occurrence of failures of project prestress anchoring is reduced, and the using safety of prestress projects is improved.
Description
Technical field
The present invention relates to the construction method of prestress anchorage system and this anchoring system, particularly a kind of prestressed high-strength indented bars anchoring system and construction method.
Background technology
In Prestressed Concrete Bridges, due to the needs of shearing resistance, in bridge web, be typically provided with vertical prestressing system.The general structure adopting as shown in Figure 3 of existing vertical prestressing anchoring system technical scheme: by finish rolling deformed bar 21, what be screwed in that nut 26 on finish rolling deformed bar and anchor plate 25 form has a bonding finish rolling deformed bar anchoring system, between the anchor plate of two ends, there is bellows 23 outward with finish rolling deformed bar, below the anchor plate of two ends, be all placed with spiral bar 24, after stretch-draw completes, between bellows 23 and finish rolling deformed bar 22, be pressed into cement paste 21 by madjack pipe 26 and discharge pipe 27, because the presstressed reinforcing steel adopting is finish rolling deformed bar, this technical scheme has the following disadvantages:
1, finish rolling deformed bar is a kind of hot-rolled reinforced bar, and its reinforcing bar profile is without vertical rib discontinuous screw (referring to Fig. 4-1～Fig. 4-2); Because being subject to the restriction of rolling mill practice level, the accuracy of thread of finish rolling deformed bar institute rolling is generally lower, causes the anchoring retraction value of finish rolling deformed bar in actual use larger, and prestressed anchorage loss is very large, has reduced reliability and the application life of anchor structure.
2, the screw thread of finish rolling deformed bar is discontinuous screw, because its thread segment area is less, less with concrete bond stress; Finish rolling deformed bar is subject to the restriction of rolling mill practice, is difficult to the large diameter finish rolling deformed bar of rolling, can not meet the growth requirement of prestress engineering.
3, this anchoring system is antivacuum, thereby grouting is not full, and indented bars is easy to be corroded.
Summary of the invention
The object of the present invention is to provide a kind of thread segment area that can effectively improve prestressing force indented bars, " the prestressed high-strength indented bars anchoring system " of reinforcing steel bar and concrete adhesion strength, the construction method of this prestressed high-strength indented bars anchoring system is provided simultaneously, the generation of losing efficacy to reduce engineering prestress anchoraging, the safety in utilization of raising prestress engineering.
For addressing the above problem, the technical solution used in the present invention is: a kind of prestressed high-strength indented bars anchoring system, to comprise prestressed high-strength indented bars, what be screwed in nut on prestressed high-strength indented bars and anchor plate composition has a bonding indented bars anchoring system, it is characterized in that: described prestressed high-strength indented bars is the continuous complete thread reinforcing steel bar of cold extrusion coarse pitch, on the prestressed high-strength indented bars between nut and anchor plate, cover has backing plate, insulating pad, prestressed high-strength indented bars between the anchor plate of two ends has plastic film capicitor outward, below the anchor plate of two ends, be all placed with spiral bar, seam crossing cover at anchor plate and plastic film capicitor has thermal shrinkable sleeve, after stretch-draw completes
,between bellows and prestressed high-strength indented bars, fill with and have cement paste.
Its further technical scheme is: the nominal diameter d of the continuous complete thread reinforcing steel bar of described cold extrusion coarse pitch is 20～200mm, the continuous full thread of the continuous complete thread reinforcing steel bar of described cold extrusion coarse pitch is that thread cross-section is the trapezoidal continuous thread of class, the pitch l of this continuous thread is 10～60mm, the thread form angle a of thread is 75 °～105 °, and the high h of tooth of thread is 1.2mm～15mm.
Its further technical scheme be: have seal closure in two ends anchor plate outside, by prestressed high-strength indented bars termination, be screwed in the nut on prestressed high-strength indented bars and be arranged on backing plate between nut and anchor plate, insulating pad enclosed hood together, on seal closure, have grouting port; On backing plate, have perpendicular to prestressed reinforcement for 2～6 of the straight holes of slip casting, anchor plate is the integrated steel backing plate with sealing drum.
Another relevant technical scheme is: a kind of construction method of prestressed high-strength indented bars anchoring system, is characterized in that: this construction method comprises the following steps:
A, get the raw materials ready: make the prestressed high-strength indented bars that needs length with the continuous complete thread reinforcing steel bar of production equipment special production cold extrusion coarse pitch;
B, installation two ends prestressed high-strength indented bars anchoring system: prestressed high-strength screw-thread steel muscle anchoring system has following two kinds of methods:
1. prestressed high-strength indented bars is screwed on nut and supporting backing plate, insulating pad, anchor plate and be positioned at pre-buried formation prestressed high-strength indented bars anchoring system, the routinely construction method of fluid concrete fluid concrete between the prestressed high-strength indented bars anchoring system of two ends together with spiral bar under anchor plate, plastic film capicitor;
2. first the anchor plate of pre-buried prestressed high-strength indented bars anchoring system and be positioned at spiral bar under anchor plate, plastic film capicitor with concrete prefabricated become after prefabricated units, then on anchor plate installing insulating backing plate, backing plate and prestressed high-strength indented bars and nut formation prestressed high-strength indented bars anchoring system successively;
C, stretch-draw: stretch-draw prestressing force high-strength screw-thread steel muscle is to designing pulling force on request, and by special tightening device lock nut;
D, installation seal closure: after prestressed high-strength indented bars tensioning fixation, seal closure is installed, by prestressed high-strength indented bars termination, be screwed in the nut on prestressed high-strength indented bars and be arranged on backing plate between nut and anchor plate, insulating pad enclosed hood together;
E, vacuum grouting: after vacuumizing, carry out the grouting of whole prestressed pore passage by the grouting port of seal closure.
Owing to taking above technical scheme, the present invention's prestressed high-strength indented bars anchoring system and construction method have following characteristics and beneficial effect:
1, the prestressed high-strength indented bars of prestressed high-strength indented bars anchoring system of the present invention adopts the continuous complete thread reinforcing steel bar of cold extrusion coarse pitch, can effectively improve the thread segment area of prestressing force indented bars, is conducive to reinforcing steel bar and concrete adhesion strength.
2, the useful cross section coefficient of the prestressed high-strength indented bars of prestressed high-strength indented bars anchoring system of the present invention, higher than finish rolling deformed bar, makes the cost of production of reinforcing bar lower, has the stronger market competitiveness, is beneficial to large-scale promotion and uses.
3, the accuracy of screw machining of the prestressed high-strength indented bars of prestressed high-strength indented bars anchoring system of the present invention is higher, its coupling ground tackle can be realized anchoring retraction value and be less than 1mm, greatly reduce the loss of prestress of Bar Anchorage, more can ensure to apply prestressed reliability and validity.
4, prestressed high-strength indented bars anchoring system of the present invention is made up of the electric isolating and protecting system of high-strength screw-thread steel muscle insulating pad, anchor plate, plastic film capicitor, thermal shrinkable sleeve, seal closure etc., and anchoring system has good electric isolating and protecting performance, is conducive to the permanent anchoring of high-strength screw-thread steel muscle; Secondly, there is seal closure 1 in two ends anchor plate 5 outsides, by prestressed high-strength indented bars termination, be screwed in the nut 2 on prestressed high-strength indented bars and be arranged on backing plate 3 between nut 2 and anchor plate 5, insulating pad 4 enclosed hoods together; Vacuum grouting is carried out in duct by the anchoring system to prestressed high-strength indented bars, can effectively improve the slurry density of anchoring system, is conducive to ensure the adhesion strength of high-strength screw-thread steel muscle and cement slurry; Therefore, prestressed high-strength indented bars anchoring system of the present invention has the dual permanent protection system of vacuum grouting+electric isolating and protecting, is more conducive to improve the anchoring property of high-strength screw-thread steel muscle, improves the durability of whole anchoring system.
5, the advantage that the construction method of the hermetically sealed prestressed high-strength indented bars of the present invention anchoring system has is:
A. adopt separate type prefabricated units parts Assembling, easy construction, quick;
B. after prestressed reinforcement is installed and used, can make regular check on its system isolating and protecting resistance value, carry out in time detailed survey when requiring, ascertain the reason and get rid of potential safety hazard.
Below, the prestressed high-strength indented bars anchoring system to the present invention and the technical characterictic of construction method are further described in conjunction with the accompanying drawings and embodiments.
Brief description of the drawings
Fig. 1-1～Fig. 1-2 is the structural representation of the present invention's prestressed high-strength indented bars anchoring system;
Fig. 1-1: master looks sectional view, Fig. 1-2: the A of Fig. 1-1 is to view (removing after seal closure);
Fig. 2-1～Fig. 2-3rd, the structural representation of the continuous complete thread reinforcing steel bar of cold extrusion coarse pitch:
Fig. 2-1: contour structures schematic diagram, Fig. 2-2: the cross sectional representation of Fig. 2-1,
Fig. 2-3: the screwed tooth structure schematic diagram of the continuous complete thread reinforcing steel bar of cold extrusion coarse pitch;
Fig. 3 is the structural representation that has bonding finish rolling deformed bar anchoring system of prior art;
Fig. 4-1～Fig. 4-2nd, the structural representation of the finish rolling deformed bar of prior art:
Fig. 4-1: contour structures schematic diagram, Fig. 4-2: the cross sectional representation of Fig. 4-1.
In Fig. 1～Fig. 2-3:
1-seal closure, 2-nut, 3-backing plate, 4-insulating pad, 5-anchor plate, 6-spiral bar, 7-thermal shrinkable sleeve, 8-plastic film capicitor, 9-prestressed high-strength indented bars, the grouting port on 10-seal closure, 11-cement paste.
The nominal diameter of the continuous complete thread reinforcing steel bar of d-cold extrusion coarse pitch, the pitch of the continuous complete thread reinforcing steel bar of l-cold extrusion coarse pitch, the thread form angle of a-thread, the tooth of h-thread is high.
In Fig. 3-Fig. 4-2:
21-cement paste, 22-finish rolling deformed bar, 23-bellows, 24-spiral bar, 25-anchor plate, 26-nut, 27-discharge pipe, 28-madjack pipe.
detailed description of the invention
Embodiment mono-:
A kind of prestressed high-strength indented bars anchoring system.
As shown in Figure 1, described prestressed high-strength indented bars anchoring system is to comprise prestressed high-strength indented bars 9, what be screwed in that nut 2 on prestressed high-strength indented bars and anchor plate 5 form has a bonding indented bars anchoring system, described prestressed high-strength indented bars is the continuous complete thread reinforcing steel bar of cold extrusion coarse pitch, on the prestressed high-strength indented bars 9 between nut 2 and anchor plate 5, cover has backing plate 3, insulating pad 4, prestressed high-strength indented bars between the anchor plate of two ends has plastic film capicitor 8 outward, below the anchor plate of two ends, be all placed with spiral bar 6, seam crossing cover at anchor plate 5 and plastic film capicitor 8 has thermal shrinkable sleeve 7.
There is seal closure 1 in two ends anchor plate 5 outsides, by prestressed high-strength indented bars termination, be screwed in the nut 2 on prestressed high-strength indented bars and be arranged on backing plate 3 between nut 2 and anchor plate 5, insulating pad 4 enclosed hoods together, on seal closure, have grouting port 10; On backing plate 3, have perpendicular to prestressed reinforcement for 2～6 of the straight holes of slip casting, anchor plate 5 is the integrated steel backing plate with sealing drum; After stretch-draw completes
,between bellows 8 and prestressed high-strength indented bars 9, fill with and have cement paste 11.
As shown in Fig. 2-1～Fig. 2-3, the nominal diameter d that forms the continuous complete thread reinforcing steel bar of cold extrusion coarse pitch of prestressed high-strength indented bars is 20～200mm, the continuous full thread of the continuous complete thread reinforcing steel bar of described cold extrusion coarse pitch is that thread cross-section is the trapezoidal continuous thread of class, the pitch l of this continuous thread is 10～60mm, the thread form angle a of thread is 75 °～105 °, and the high h of tooth of thread is 1.2mm～15mm.
embodiment bis-:
A construction method for prestressed high-strength indented bars anchoring system, this construction method comprises the following steps:
A, get the raw materials ready: make the prestressed high-strength indented bars that needs length with the continuous complete thread reinforcing steel bar of production equipment special production cold extrusion coarse pitch;
B, installation two ends prestressed high-strength indented bars anchoring system: prestressed high-strength screw-thread steel muscle anchoring system has following two kinds of methods:
1. prestressed high-strength indented bars is screwed on nut and supporting backing plate, insulating pad, anchor plate and be positioned at pre-buried formation prestressed high-strength indented bars anchoring system, the routinely construction method of fluid concrete fluid concrete 9 between the prestressed high-strength indented bars anchoring system of two ends together with spiral bar under anchor plate, plastic film capicitor;
2. first the anchor plate of pre-buried prestressed high-strength indented bars anchoring system and be positioned at spiral bar under anchor plate, plastic film capicitor with concrete prefabricated become after prefabricated units, then on anchor plate installing insulating backing plate, backing plate and prestressed high-strength indented bars and nut formation prestressed high-strength indented bars anchoring system successively;
C, stretch-draw: stretch-draw prestressing force high-strength screw-thread steel muscle is to designing pulling force on request, and by special tightening device lock nut;
D, installation seal closure: after prestressed high-strength indented bars tensioning fixation, seal closure 1 is installed, by prestressed high-strength indented bars termination, be screwed in the nut 2 on prestressed high-strength indented bars and be arranged on backing plate 3 between nut 2 and anchor plate 5, insulating pad 4 enclosed hoods together;
E, vacuum grouting: after vacuumizing, carry out the grouting of whole prestressed pore passage by the grouting port of seal closure.
Claims (4)
1. a prestressed high-strength indented bars anchoring system, to comprise prestressed high-strength indented bars, what be screwed in nut on prestressed high-strength indented bars and anchor plate composition has a bonding indented bars anchoring system, it is characterized in that: described prestressed high-strength indented bars is the continuous complete thread reinforcing steel bar of cold extrusion coarse pitch, on the prestressed high-strength indented bars between nut (2) and anchor plate (5), cover has backing plate (3), insulating pad (4), prestressed high-strength indented bars between the anchor plate of two ends has plastic film capicitor (8) outward, below the anchor plate of two ends, be all placed with spiral bar (6), seam crossing cover at anchor plate (5) and plastic film capicitor (8) has thermal shrinkable sleeve (7), after stretch-draw completes
,between bellows (8) and prestressed high-strength indented bars (9), fill with and have cement paste (11).
2. prestressed high-strength indented bars anchoring system according to claim 1, it is characterized in that: the nominal diameter d of the continuous complete thread reinforcing steel bar of described cold extrusion coarse pitch is 20～200mm, the continuous full thread of the continuous complete thread reinforcing steel bar of described cold extrusion coarse pitch is that thread cross-section is the trapezoidal continuous thread of class, the pitch l of this continuous thread is 10～60mm, the thread form angle a of thread is 75 °～105 °, and the high h of tooth of thread is 1.2mm～15mm.
3. prestressed high-strength indented bars anchoring system according to claim 1 and 2, it is characterized in that: have seal closure (1) in two ends anchor plate (5) outside, by prestressed high-strength indented bars termination, be screwed in the nut (2) on prestressed high-strength indented bars and be arranged on backing plate (3) between nut (2) and anchor plate (5), insulating pad (4) enclosed hood together, on seal closure, have grouting port; On backing plate (3), have perpendicular to prestressed reinforcement for 2～6 of the straight holes of slip casting, anchor plate (5) is the integrated steel backing plate with sealing drum.
4. a construction method for prestressed high-strength indented bars anchoring system, is characterized in that: this construction method comprises the following steps:
A, get the raw materials ready: make the prestressed high-strength indented bars that needs length with the continuous complete thread reinforcing steel bar of production equipment special production cold extrusion coarse pitch;
B, installation two ends prestressed high-strength indented bars anchoring system: prestressed high-strength screw-thread steel muscle anchoring system has following two kinds of methods:
1. prestressed high-strength indented bars is screwed on nut and supporting backing plate, insulating pad, anchor plate and be positioned at pre-buried formation prestressed high-strength indented bars anchoring system, the routinely construction method of fluid concrete fluid concrete between the prestressed high-strength indented bars anchoring system of two ends together with spiral bar under anchor plate, plastic film capicitor;
2. first the anchor plate of pre-buried prestressed high-strength indented bars anchoring system and be positioned at spiral bar under anchor plate, plastic film capicitor with concrete prefabricated become after prefabricated units, then on anchor plate installing insulating backing plate, backing plate and prestressed high-strength indented bars and nut formation prestressed high-strength indented bars anchoring system successively;
C, stretch-draw: stretch-draw prestressing force high-strength screw-thread steel muscle is to designing pulling force on request, and by special tightening device lock nut;
D, installation seal closure: after prestressed high-strength indented bars tensioning fixation, seal closure (1) is installed, by prestressed high-strength indented bars termination, be screwed in the nut (2) on prestressed high-strength indented bars and be arranged on backing plate (3) between nut (2) and anchor plate (5), insulating pad (4) enclosed hood together;
E, vacuum grouting: after vacuumizing, carry out the grouting of whole prestressed pore passage by the grouting port of seal closure.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105155679A (en) * | 2015-09-22 | 2015-12-16 | 中交四航局第三工程有限公司 | Integral steel-plastic pre-embedded circular truncated cone nut and construction method thereof |
| CN105507148A (en) * | 2014-09-26 | 2016-04-20 | 上海建科预应力技术工程有限公司 | Connecting structure for cable clamp and suspender of suspension bridge |
| CN106498856A (en) * | 2016-11-28 | 2017-03-15 | 柳州欧维姆工程有限公司 | A kind of engineering tensioning system of two halves formula with thread |
| CN110396927A (en) * | 2019-07-08 | 2019-11-01 | 中建三局第二建设工程有限责任公司 | For bridge tower transverse direction bonded prestress rod iron anchoring assembly and construction method |
| CN110438903A (en) * | 2019-07-30 | 2019-11-12 | 中铁十二局集团有限公司 | Vertical prestressing spiral stretch-draw construction method and quality determining method |
| CN111910671A (en) * | 2020-07-20 | 2020-11-10 | 国网浙江省电力有限公司丽水供电公司 | Prestressed anchor rod combined excavation composite foundation and construction method thereof |
| CN111926703A (en) * | 2020-08-25 | 2020-11-13 | 浙锚科技股份有限公司 | High-strength prestressed reinforcement anchoring system and construction method thereof |
| CN113668774A (en) * | 2021-08-12 | 2021-11-19 | 中冶南方城市建设工程技术有限公司 | Twisted steel tensioning and anchoring device and construction method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110438903A (en) * | 2019-07-30 | 2019-11-12 | 中铁十二局集团有限公司 | Vertical prestressing spiral stretch-draw construction method and quality determining method |
| CN111910671A (en) * | 2020-07-20 | 2020-11-10 | 国网浙江省电力有限公司丽水供电公司 | Prestressed anchor rod combined excavation composite foundation and construction method thereof |
| CN111926703A (en) * | 2020-08-25 | 2020-11-13 | 浙锚科技股份有限公司 | High-strength prestressed reinforcement anchoring system and construction method thereof |
| CN113668774A (en) * | 2021-08-12 | 2021-11-19 | 中冶南方城市建设工程技术有限公司 | Twisted steel tensioning and anchoring device and construction method thereof |
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Application publication date: 20140924 |