CN203049920U - 19-silk steel strand anchoring structure - Google Patents
19-silk steel strand anchoring structure Download PDFInfo
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- CN203049920U CN203049920U CN 201320028415 CN201320028415U CN203049920U CN 203049920 U CN203049920 U CN 203049920U CN 201320028415 CN201320028415 CN 201320028415 CN 201320028415 U CN201320028415 U CN 201320028415U CN 203049920 U CN203049920 U CN 203049920U
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- clipper
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Abstract
The utility model relates to a 19-silk steel strand anchoring structure, and solves the problems that the existing anchorage device clamping piece is suitable for 1*7 silk structure steel strand and is not suitable for 1*19 silk structure steel strands which are arranged in a three-layer manner. The 19-silk steel strand anchoring structure is characterized in that a tooth form section of a thread of an anchorage device clamping piece is a triangle, a tooth apex angle of the thread is 75 degrees-85 degrees, small diameter ends on the two side faces of the tooth apex angle, which face to the anchorage device clamping piece, are wedge surfaces, and large diameter ends on the two side faces of the tooth apex angle, which face to the anchorage device clamping piece, are pawl surfaces, and the included angle of the pawl surfaces and two tooth root connecting line is 65 degrees-85 degrees; the newly-designed tooth apex angle of the thread and the pawl surfaces and the wedge surfaces as well as the included angle of the pawl surfaces can cause the thread to form pawls which can prevent the anchorage device clamping piece to slide, so that the tendon follows up in stretch-draw retraction; the included angle of the wedge surfaces is designed to have low pressure to the steel strand, so that the anchorage device clamping piece is convenient to loose, and the steel strand quits; and the tooth apex angle is controlled to guarantee that the thread is suitable for the nick of the surface of the steel strand, and the steel strand cannot be ruptured untimely.
Description
Technical field
The utility model relates to a kind of anchor structure, especially a kind of 19 steel strand anchor structures that are applicable to 19 steel strand.
Background technology
From last century the eighties China in mid-term begin to introduce in the world advanced underrelaxation, high-strength prestress steel strand production line relies on, steel strand have become the prestressed material of extensive employing of the whole world at present.A large amount of dimensions that adopt have 12.7mm, 15.2mm etc., and intensity rank commonly used is the 1860MPa rank.At present 1860MPa level 1X7-15.24mm high strength low relaxed prestress steel strand is the highest, most widely used general, the kind that has the call of intensity rank in the prestress wire of widespread commercial application, but 1X7 construction pre-stress steel strand embody its limitation day by day in above-mentioned field: the loading force of (1) single steel strand can not satisfy the requirement of superprojects, is not less than 850KN as the Breaking load of some engine request single steel strand; (2) every bundle steel strand radical of reeving is many, and the difficulty of reeving is big; (3) the steel strand radical is a lot of in every bundle presstressed reinforcing steel, and the length of each root steel strand can not be isometric, causes steel strand discontinuity in the bundle, has a strong impact on construction speed and construction quality.
In order to improve the performance of prestress wire, in recent years, many manufacturing enterprises have carried out positive research and development, mainly concentrate on the basis of existing 1X7 structural iron twisted wire, by using measures such as high-quality wire rod, improvement production technology to improve the intensity of steel strand, make it to reach 2000MPa.Though the strength grade that improves steel strand can increase the Breaking load of single steel strand, but under current technical condition, at present slow of speech of institute for the production of the wire rod intensity of prestressing force product approaching to greatest extent, closely limited from the potentiality of the excavating raw material intensity effect of starting with, can not tackle the problem at its root, and can make the price of steel strand improve a lot; On the other hand, along with the raising of intensity, the case hardness of steel strand improves, and is higher to the hardness requirement of anchor clipper, is difficult at present accomplish.
Fast development along with prestressing technique, the steel strand developing trend is in high strength, high-durability, product newly-increased in this series products mainly is 19 steel strand of major diameter, 19 steel strand products of the major diameter that occurs on the market mainly comprise 21.8mm, 28.6mm, because 19 steel strand products of major diameter have high strength, the characteristics of high-durability, at bridge, water conservancy, the ocean, a plurality of fields such as mine have sizable advantage, therefore on international and domestic market, will be widely used, at present also be in the initial stage with domestic research and development at this series products anchoring system in the world, large diameter steel strand are because pulling force is bigger, the quality of steel strand is also bigger to the influence of the anchoring property of ground tackle, therefore to the anchoring property of supporting ground tackle, compliance and construction process requirement are higher.
Patent Office of the People's Republic of China has announced a CN202164744U patent on March 14th, 2012, name is called a kind of anchor clipper of high anchoring efficient, comprise the hollow cone platform that is constituted by two symmetrically arranged intermediate plate main bodys, the larger diameter end external surface of intermediate plate main body is provided with groove, it is semicircular through hole that the cross section is set in the intermediate plate main body, the bottom diameter of through hole equates that the upper-end inner diameter of through hole extends out, and through-hole surfaces arranges screw thread.The inwall of through hole arranges screw thread, by screw thread steel strand are clamped, but 1X19 structural iron twisted wire is three layers of arrangement, wire drawing takes place during anchoring easily, the screw thread of common profile angle, tooth depth exerts an influence to anchoring, and dental impression is too dark, bites steel strand easily broken, dental impression is too shallow, make and sting tight power deficiency, make the steel strand slippage easily, influence engineering, also can form cut at steel strand surface, influence the steel strand performance.
Summary of the invention
The purpose of this utility model provides a kind of 19 steel strand anchor structures, and is main supporting with 1X19 silk steel strand, the promoting the use of of realization 1X19 silk steel strand.
The utility model has solved existing anchor clipper and has been applicable to 1X7 silk structural iron twisted wire, be not suitable for the problem of the 1X19 silk structural iron twisted wire of three layers of arrangement, a kind of 19 steel strand anchor structures are provided, match with 1X19 silk structural iron twisted wire, 19 steel strand are used in engineering.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of 19 steel strand anchor structures, comprise the anchor slab and the anchor clipper that cooperatively interact, anchor slab is provided with anchor hole, the anchor clipper appearance is tapered, anchor clipper is made up of the intermediate plate main body of three identical shaped structures, three intermediate plate main bodys are closed up at the axis place of taper formation through hole, through-hole wall is provided with screw thread, the angle of anchor clipper taper is 5.5 °-7.5 °, anchor hole is taper, the angle of taper of anchor hole is 5.5 °-7.5 °, the angle of taper of anchor hole less than anchor clipper angle of taper 20 '-30 '; The thread form cross section of screw thread is triangle, the crest angle of screw thread is 75 °-85 °, the two sides at crest angle are wedge surface towards the anchor clipper miner diameter end, be the pawl face towards the anchor clipper bigger diameter end, the angle of pawl face and screw thread two root of the tooth lines is 65 °-85 °, and the equivalent friction angle between anchor clipper and the presstressed reinforcing steel is more than or equal to the equivalent friction angle sum of anchor clipper angle of taper and anchor clipper and anchor slab anchor hole.When presstressed reinforcing steel is stressed, owing in the anchor clipper through hole threaded engagement presstressed reinforcing steel is arranged, enter in the anchor hole of anchor slab and drive intermediate plate, because wedge principle, more wedge is more tight; Screw thread can increase the frictional force between anchor clipper and the steel strand, also just increased the equivalent friction angle between anchor clipper and the presstressed reinforcing steel, ground tackle can be realized from anchor, the angle of control anchor clipper taper, give full play to intensity and the ductility of presstressed reinforcing steel, can not cause the screw thread of anchor clipper excessive to the presstressed reinforcing steel chucking power, prevent the steel strand that bite; Crest angle and pawl face and the wedge surface of new design screw thread, the angle of pawl face makes screw thread form pawl, prevent that anchor clipper from skidding off, follow-up when being convenient to the tension of prestressed tendon retraction, the angle of design wedge surface is little to steel strand pressure, be convenient to steel strand repeatedly during stretch-draw, anchor clipper unclamps, steel strand withdraw from, control crest angle has guaranteed that the indentation of the relative steel strand surface of screw thread is proper, can not cause the steel strand premature failure, guarantee the degree of depth that screw thread embeds steel strand, equivalent friction angle between anchor clipper and the presstressed reinforcing steel is more than or equal to the equivalent friction angle sum of anchor clipper angle of taper and anchor clipper and anchor slab anchor hole, can effectively guarantee anchor clipper from the anchor performance, these 19 steel strand tensions that just are fit to three layers of arrangement architecture use; Relation between anchor clipper angle of taper and the anchor hole angle of taper, the design of this angle, make that intermediate plate only contacted with the big end of anchor slab anchor hole when steel strand tension began, thereby anchor clipper small end stress and obviously decline of pressure, the big end of anchor clipper is bigger to the chucking power of steel strand, carrying out along with stretch-draw, anchor clipper progressively follows up and enters into to deform in the anchor hole and adapts with the anchor hole tapering, make steel strand be subjected to uniform chucking power, simultaneously chucking power can be delivered to internal layer gradually from the skin of steel strand, thereby improve the anchoring property of ground tackle integral body.
As preferably, the bigger diameter end of through hole diameter at one end than the corresponding little 0.4-0.6mm of steel strand diameter; The tooth of screw thread is apart from being 1mm-1.6mm, and the tooth height of screw thread is 1/3 of tooth distance, is the arc chord angle transition between adjacent wedge surface and the pawl face.The diameter control of through hole, when guaranteeing that anchor clipper is bitten steel strand, the outer poppet surface of anchor clipper fully contacts with anchor slab anchor hole surface, and is stressed even, makes anchor clipper embed the control of the steel strand degree of depth at 0.2mm-0.3mm; The tooth of screw thread increases apart from the diameter with steel strand, according to the diameter of 19 steel strand, the tooth distance of design and tooth height guarantee to have enough frictional force between screw thread and the steel strand, the surface embedded dark to steel strand and crushed steel strand again, prevented that steel strand from being broken too early.
As preferably, the through hole at anchor clipper miner diameter end place is horn mouth, and bell-mouthed expansion angle is 2-5 °, and bell-mouthed axial length is 15-30mm.Horn mouth prevents that steel strand from being bitten broken too early in the anchor clipper entrance, has improved ground tackle static load performance and anti-fatigue performance.
As preferably, flare end is round-corner transition.Round-corner transition prevents that the horn mouth edge from forming the sword limit to steel strand and stinging and cut.
As preferably, the anchor clipper case hardness is HRC58-HRC62, and effectively the hard formation degree of depth is at least 0.2mm, and the anchor clipper core hardness is lower than HRC46.Improve the hardness of anchor clipper external surface, can reduce the equivalent friction angle of anchor clipper and anchor slab anchor hole, thereby make equivalent friction angle between anchor clipper and the presstressed reinforcing steel and the angle of taper of anchor clipper have bigger choice, be convenient to reduce the roughness of anchor clipper external surface after the raising hardness, control this heat treatment, the screw thread that can guarantee anchor clipper can be bitten high-intensity steel strand, core has good ductility simultaneously, can be by distortion and the anchor hole that adapts to the irregular profile of steel strand and anchor slab.
The design of this angle, make that intermediate plate only contacted with the big end of anchor slab anchor hole when steel strand tension began, thereby anchor clipper small end stress and obviously decline of pressure, the big end of anchor clipper is bigger to the chucking power of steel strand, carrying out along with stretch-draw, anchor clipper progressively follows up and enters into to deform in the anchor hole and adapts with the anchor hole tapering, makes steel strand be subjected to uniform chucking power, thereby improves the anchoring property of ground tackle integral body.
As preferably, anchor clipper bigger diameter end external surface is provided with a circle groove, the cross section semicircular in shape of groove.Hoop is set in the groove, is beneficial to three minutes intermediate plate main body of anchor clipper and follows up simultaneously, it is more neat to follow up.
The beneficial effects of the utility model are: the crest angle and pawl face and the wedge surface that newly design screw thread, the angle of pawl face makes screw thread form pawl, prevent that anchor clipper from skidding off, follow-up when being convenient to the tension of prestressed tendon retraction, the angle of design wedge surface is little to steel strand pressure, be convenient to steel strand repeatedly during stretch-draw, anchor clipper unclamps, steel strand withdraw from, control crest angle has guaranteed that the indentation of the relative steel strand surface of screw thread is proper, can not cause the steel strand premature failure, guarantee the degree of depth that screw thread embeds steel strand, equivalent friction angle between anchor clipper and the presstressed reinforcing steel is more than or equal to the equivalent friction angle sum of anchor clipper angle of taper and anchor clipper and anchor slab anchor hole, can effectively guarantee anchor clipper from the anchor performance, these 19 steel strand tensions that just are fit to three layers of arrangement architecture use.
Description of drawings
Fig. 1 is a kind of anchor clipper structural representation of the utility model;
Fig. 2 is the enlarged diagram of a kind of through hole of the utility model;
Fig. 3 is a kind of structural representation of the utility model;
Fig. 4 is the sectional schematic diagram of a kind of 19 steel strand of the utility model;
Fig. 5 is the sectional schematic diagram of another kind of 19 steel strand of the utility model;
Among the figure: 1, anchor clipper, 2, through hole, 3, horn mouth, 4, screw thread, 5, groove, 6, the pawl face, 7, wedge surface, 8, anchor hole, 9, anchor slab, 10, steel strand.
The specific embodiment
Below by specific embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: a kind of 19 steel strand anchor structures (referring to accompanying drawing 1 accompanying drawing 3), comprise the anchor slab 9 and the anchor clipper 1 that cooperatively interact, anchor slab is provided with the anchor hole 8 of taper, the cone angle of anchor clipper external surface greater than the cone angle 25 of anchor hole on the anchor slab '.Anchor clipper 1 appearance is tapered, is made up of the intermediate plate main body of three identical shaped structures, and three intermediate plate main bodys are closed up at the axis place of taper formation through hole 2, and through-hole wall is provided with screw thread 4.The angle of the taper of anchor clipper appearance is 6 °, bigger diameter end the diameter of through hole at one end than the corresponding little 0.5mm of steel strand 10 diameters, the through hole at anchor clipper miner diameter end place is horn mouth 3, bell-mouthed expansion angle is 3 °, bell-mouthed axial length is 20mm, and flare end is round-corner transition.The anchor clipper case hardness is HRC60, and effectively the hard formation degree of depth is at least 0.35mm, and the anchor clipper core hardness is HRC40.Anchor clipper bigger diameter end external surface is provided with a circle groove 5, the cross section semicircular in shape of groove.
The thread form cross section of screw thread is triangle (referring to accompanying drawing 2), the crest angle of screw thread is 80 °, the two sides at crest angle are wedge surface 7 towards the anchor clipper miner diameter end, be pawl face 6 towards the anchor clipper bigger diameter end, the angle of pawl face and screw thread two root of the tooth lines is 75 °, and the equivalent friction angle between anchor clipper and the presstressed reinforcing steel is more than or equal to the equivalent friction angle sum of anchor clipper angle of taper and anchor clipper and anchor slab anchor hole.The tooth of screw thread is apart from being 1.25mm, and the tooth height of screw thread is 1/3 of tooth distance, is the arc chord angle transition between adjacent wedge surface and the pawl face.The screw thread of anchor clipper is to greater than the steel strand diameter 2.5 times of the clamping length of steel strand.
19 steel strand have two kinds of structures, and two kinds are three layer construction.A kind of is western Shandong type (referring to accompanying drawing 4), and the radical of inside and outside layer silk equates that outer silk is thicker than intermediate layer silk, and outer silk is cut the groove that is positioned at intermediate layer two adjacent filaments.Another kind gulps down type (referring to accompanying drawing 5) for a watt woods, outer silk is the twice of intermediate layer silk, the intermediate layer silk is by forming with diameter wire, skin is that the steel wire of two kinds of different-diameters is formed, in the skin thick steel wire mediate the layer two adjacent filaments groove in, thin steel wire is between the steel wire thick in the skin in the skin.
Above-described embodiment is a kind of preferred version of the present utility model, is not the utility model is done any pro forma restriction, also has other variant and remodeling under the prerequisite that does not exceed the technical scheme that claim puts down in writing.
Claims (6)
1. 19 steel strand anchor structures, comprise the anchor slab and the anchor clipper that cooperatively interact, anchor slab is provided with anchor hole, the anchor clipper appearance is tapered, anchor clipper is made up of the intermediate plate main body of three identical shaped structures, three intermediate plate main bodys are closed up at the axis place of taper formation through hole, through-hole wall is provided with screw thread, the angle that it is characterized in that the anchor clipper taper is 5.5 °-7.5 °, anchor hole is taper, the angle of taper of anchor hole is 5.5 °-7.5 °, the angle of taper of anchor hole less than anchor clipper angle of taper 20 '-30 '; The thread form cross section of screw thread is triangle, the crest angle of screw thread is 75 °-85 °, the two sides at crest angle are wedge surface towards the anchor clipper miner diameter end, be the pawl face towards the anchor clipper bigger diameter end, the angle of pawl face and screw thread two root of the tooth lines is 65 °-85 °, and the equivalent friction angle between anchor clipper and the presstressed reinforcing steel is more than or equal to the equivalent friction angle sum of anchor clipper angle of taper and anchor clipper and anchor slab anchor hole.
2. 19 steel strand anchor structures according to claim 1, it is characterized in that through hole bigger diameter end diameter at one end than the corresponding little 0.4-0.6mm of steel strand diameter; The tooth of screw thread is apart from being 1mm-1.6mm, and the tooth height of screw thread is 1/3 of tooth distance, is the arc chord angle transition between adjacent wedge surface and the pawl face.
3. 19 steel strand anchor structures according to claim 1, the through hole that it is characterized in that anchor clipper miner diameter end place is horn mouth, and bell-mouthed expansion angle is 2-5 °, and bell-mouthed axial length is 15-30mm.
4. 19 steel strand anchor structures according to claim 3 is characterized in that flare end is round-corner transition.
5. 19 steel strand anchor structures according to claim 1 is characterized in that the anchor clipper case hardness is HRC58-HRC62, and effectively the hard formation degree of depth is at least 0.2mm, and the anchor clipper core hardness is lower than HRC46.
6. according to claim 1 or 2 or 3 or 4 or 5 described 19 steel strand anchor structures, it is characterized in that anchor clipper bigger diameter end external surface is provided with a circle groove, the cross section semicircular in shape of groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320028415 CN203049920U (en) | 2013-01-18 | 2013-01-18 | 19-silk steel strand anchoring structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320028415 CN203049920U (en) | 2013-01-18 | 2013-01-18 | 19-silk steel strand anchoring structure |
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| Publication Number | Publication Date |
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| CN203049920U true CN203049920U (en) | 2013-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320028415 Expired - Lifetime CN203049920U (en) | 2013-01-18 | 2013-01-18 | 19-silk steel strand anchoring structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103104069A (en) * | 2013-01-18 | 2013-05-15 | 杭州浙锚预应力有限公司 | 19-wire steel strand anchoring structure |
-
2013
- 2013-01-18 CN CN 201320028415 patent/CN203049920U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103104069A (en) * | 2013-01-18 | 2013-05-15 | 杭州浙锚预应力有限公司 | 19-wire steel strand anchoring structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 311402 high tech industry function zone, Fuyang District, Zhejiang, Hangzhou Patentee after: ZHEMAO SCIENCE & TECHNOLOGY CO.,LTD. Address before: 311402 Hangzhou Fuyang anchor prestress Co., Ltd., 79 Gaoqiao Road, Gaoqiao Town, Hangzhou, Zhejiang Patentee before: HANGZHOU ZHEMAO PRESTRESSING FORCE CO.,LTD. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20130710 |
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| CX01 | Expiry of patent term |