CN101260741A - Short bundle cable stretching caging device and method for stretching and anchoring - Google Patents
Short bundle cable stretching caging device and method for stretching and anchoring Download PDFInfo
- Publication number
- CN101260741A CN101260741A CNA2007100516405A CN200710051640A CN101260741A CN 101260741 A CN101260741 A CN 101260741A CN A2007100516405 A CNA2007100516405 A CN A2007100516405A CN 200710051640 A CN200710051640 A CN 200710051640A CN 101260741 A CN101260741 A CN 101260741A
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- spike
- plate
- steel strand
- limiting plate
- stretch
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004873 anchoring Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 46
- 239000010959 steel Substances 0.000 claims abstract description 46
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 2
- 229910001018 Cast iron Inorganic materials 0.000 claims description 2
- 229920006351 engineering plastic Polymers 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
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Abstract
The invention relates to short steel strand stretching caging device and a method used for stretching and anchoring. The caging device consists of an arm brace, a supporting nut and a limited plate, wherein, the arm brace is a cylinder which is provided with two symmetrical windows and internal threads; the supporting nut which is positioned in the arm brace is a section of circular ring the central circumference of which is uniformly distributed with 1 to 8 through holes which are used for adjusting positions; external threads which are matched with the internal threads on the arm brace are arranged on the supporting nut which is connected with the arm brace through the external threads; the limited plate is a flat cylindrical plate the central part of which is uniformly provided with through holes used for steel strands to pass through and the end part of which is provided with a concave step; the number of the through holes on the limited plate is consistent with that of clamping piece holes on an archor plate of an archor component to be stretched; and the limited plate is positioned inside the arm brace and adjacent to the supporting nut. Under the condition of stretching, the arm brace of the stretching caging device is connected with a jack through bolts and the operations of primary stretching and secondary stretching can be realized by adjustment of the position of the supporting nut without replacement of the jack, thereby the structure of the device is simple and the construction method is convenient.
Description
Technical field:
The present invention relates to a kind of auxiliary tensioner and method for stretching thereof of presstressed reinforcing steel, particularly a kind of method of lacking bundle steel strand tension stopping means and being used for stretch-draw anchor.
Background technology:
At present, increasing bridge adopts the steel strand anchoring system as vertical prestressing, vertical prestressing bar in the bridge is generally shorter, the amount of recovery of conventional ground tackle steel strand when stretch-draw anchor generally has 4～7 millimeters, it is low and uncertain that this makes the effective prestress of steel strand remainder cross, and can't satisfy the designing requirement of vertical prestressing.For satisfying the designing requirement of vertical prestressing, must change the structure and the method for stretching of conventional ground tackle, structurally the anchor slab cylindrical is opened screw thread, and adds and join a nut; The existing methods that adopt two times tensioning on method for stretching: stretch-draw for the first time is the steel strand anchorage method for stretching routinely more, carry out two times tensioning again behind the steel strand anchoring retraction, during two times tensioning, used stretch-draw jack and stretch-draw instrument in the time of will unloading stretch-draw for the first time earlier, the jack of changing the band spike then again stretch-draw to design load, this moment, whole anchor slab can leave several mm distance of anchor plate end face, before putting an anchoring, screw nut on the anchor slab earlier to the end face of anchor plate, after putting an anchoring like this, the amount of recovery of steel strand is little, reaches the designing requirement of vertical prestressing.
In above-mentioned whole stretching process, carry out the replacing of jack and stretch-draw instrument, this is very loaded down with trivial details for actual engineering construction, inefficiency.
Summary of the invention:
The technical problem to be solved in the present invention is: a kind of short method of restrainting the steel strand tension stopping means and being used for stretch-draw anchor with spike is provided, utilize this device to can be implemented in the stretching process of finishing whole vertical prestressing bar under the situation of not changing jack, thereby solve the problems referred to above that prior art exists.
The technical scheme that addresses the above problem is: a kind of short bundle steel strand tension stopping means, by spike, back nut and limiting plate are formed, described spike is one to have the cylinder of two symmetrical windows, internal thread is arranged in the cylinder, the back nut that is positioned at spike is one section annulus, its middle part circumference evenly is laid with 1～8 through hole that is used for adjusting position, also be provided with on the back nut with spike on the external screw thread that matches of internal thread and take this to be threaded with spike, limiting plate is one and evenly is laid with the oblate cylindricality plate that the through hole that is used for steel strand and end have concave station rank at the middle part, intermediate plate hole number on the limiting plate on the anchor slab of the quantity of through hole and the ground tackle assembly of wanting stretch-draw is consistent, and limiting plate is positioned at spike and back nut is adjacent.
Another technical scheme of the present invention is: a kind ofly lack the method that bundle steel strand tension stopping means is used for stretch-draw anchor, it be adopt the present invention above-mentioned by spike, the short bundle steel strand tension stopping means that back nut and limiting plate are formed, the assembly of the stretch-draw of wanting is mainly by intermediate plate, anchor slab, nut, anchor plate and steel strand are formed, the spike of short bundle steel strand tension stopping means is connected with jack by bolt, realize the operation of stretch-draw for the first time and two times tensioning by the position of regulating back nut: during stretch-draw for the first time, back nut withstands limiting plate makes anchor slab near the anchor plate end face, when putting for the first time anchoring, the limited anchoring of steel strand; When carrying out two times tensioning, regulate back nut and leave 10～20 millimeters distances of limiting plate, when making stretch-draw again to design load, anchor slab, intermediate plate and limiting plate can move after the freedom, screw nut and can put an anchoring to the anchor plate end face.
The spike inner circle of the present invention's weak point bundle steel strand tension stopping means has internal thread, this internal thread cooperates with the back nut external screw thread, by regulating the back nut position, realize in the whole stretching process position-limiting action whether control to limiting plate: when back nut held out against limiting plate, limiting plate played position-limiting action; Do not need when spacing when carrying out two times tensioning, regulate back nut and make it to leave the limiting plate certain distance, when making stretch-draw again to design load, anchor slab, intermediate plate and limiting plate can move after the freedom, screw nut and can put an anchoring to the anchor plate end face.Therefore, can realize the operation of stretch-draw for the first time and two times tensioning under the situation of not changing jack, and tensioning equipment is simple in structure, job practices is convenient.
Below, in conjunction with the accompanying drawings and embodiments the present invention's weak point bundle steel strand tension stopping means and the technical characterictic that is used for the method for stretch-draw anchor are further described.
Description of drawings:
Fig. 1: the structure and the user mode reference diagram of the present invention's weak point bundle steel strand tension stopping means;
Fig. 2～Fig. 3: the spike structural representation of short bundle steel strand tension stopping means:
The right view of Fig. 2-Fig. 3, Fig. 3-master looks sectional view;
Fig. 4: back nut structural representation (the main sectional view of looking);
Fig. 5: limiting plate structural representation (the main sectional view of looking);
The left view of Fig. 6: Fig. 5.
The specific embodiment:
Embodiment one:
A kind of short bundle steel strand tension stopping means, by spike 2, back nut 3 and limiting plate 4 are formed, described spike 2 is one to have the steel cylinder of two symmetrical windows 21, internal thread is arranged in the cylinder, the back nut 3 that is positioned at spike is one section steel annulus, its middle part circumference evenly is laid with 4 through holes 31 that are used to regulate back nut 3 positions, also be provided with on the back nut 3 with spike on the external screw thread that matches of internal thread and take this to be threaded with spike 2, limiting plate 4 is one and evenly is laid with the oblate cylindricality steel plate that the through hole 41 that is used for steel strand and end have concave station rank 42 at the middle part, intermediate plate hole number on the limiting plate 4 on the anchor slab of the quantity of through hole 41 and the ground tackle assembly of wanting stretch-draw is consistent, it is adjacent with back nut 3 that limiting plate 4 is positioned at spike 2, referring to Fig. 1～Fig. 5.Among the figure, 10 is spiral bar.
As a kind of conversion of the embodiment of the invention, the quantity that describedly evenly be laid on the back nut 3 middle part circumference, is used to regulate the through hole 31 of back nut 3 positions can also increase or reduce, and has 1 at least, is generally 2～8.
As another conversion of the embodiment of the invention, spike 2, back nut 3 and the limiting plate 4 of the short bundle of described composition steel strand tension stopping means are except that doing with steel, and the engineering plastics that can also adopt cast iron, alloy steel or have a sufficient intensity are made.
Embodiment two:
The method that short bundle steel strand tension stopping means is used for stretch-draw anchor.
Adopt embodiment one described by spike 2, the short bundle steel strand tension stopping means that back nut 3 and limiting plate 4 are formed, the assembly of the stretch-draw of wanting is mainly by intermediate plate 5, anchor slab 6, anchoring nut 7, anchor plate 8 and steel strand 9 are formed, weak point is restrainted spike 2 one end bearings of steel strand tension stopping means on anchor plate 8, the other end is connected with jack 1 by bolt, realize the operation of stretch-draw for the first time and two times tensioning by the position of regulating back nut 3: during stretch-draw for the first time, back nut 3 withstands limiting plate 4 makes anchor slab 6 near anchor plate 8 end faces, when putting for the first time anchoring, steel strand 9 limited anchorings; When carrying out two times tensioning, regulate back nut 3 and leave limiting plate 4 certain distances, when making stretch-draw again to design load, anchor slab 6, intermediate plate 5 and limiting plate 4 can move after the freedom, screw nut 7 and can put an anchoring to anchor plate 8 end faces.
Above-mentioned when carrying out two times tensioning, back nut 3 leaves the size of limiting plate 4 certain distances to be decided according to the requirement of stretch-draw anchor, and general value is 10～20 millimeters.
The adjusting of back nut 3 positions is to be undertaken by 2～8 through holes that evenly are laid on the back nut 3 middle part circumference, that is: insert in the through hole with general screwdriver or special tool, rotating support nut 3 makes it to move forward and backward in spike, reaches the purpose that it holds out against limiting plate or leaves limiting plate 4 certain distances.
A kind of conversion as the embodiment of the invention, it is spacing that the present invention's weak point bundle steel strand tension stopping means also can be used for other stretch-draw of lacking the bundle presstressed reinforcing steels, at this moment, the assembly of the stretch-draw of wanting mainly is made up of weak points such as intermediate plate 5, anchor slab 6, anchoring nut 7, anchor plate 8 and steel tendon or reinforcing bar bundle presstressed reinforcing steel, and its method for stretching is the same.
Claims (3)
1. restraint the steel strand tension stopping means for one kind short, by spike, back nut and limiting plate are formed, it is characterized in that: described spike (2) is one to have the cylinder of two symmetrical windows, internal thread is arranged in the cylinder, the back nut (3) that is positioned at spike (2) is one section annulus, its middle part circumference evenly is laid with 1～8 through hole that is used to regulate the back nut position, also be provided with on the back nut (3) with spike (2) on the external screw thread that matches of internal thread and take this to be threaded with spike (2), limiting plate (4) is one and evenly is laid with the oblate cylindricality plate that the through hole that is used for steel strand and end have concave station rank at the middle part, the quantity that limiting plate (4) is gone up through hole is consistent with intermediate plate hole number on the anchor slab of the ground tackle assembly of wanting stretch-draw, limiting plate (4) be positioned at spike (2) and back nut adjacent.
2. short bundle steel strand tension stopping means according to claim 1 is characterized in that: spike (2), back nut (3), the limiting plate (4) of the short bundle of described composition steel strand tension stopping means adopt steel, cast iron, alloy steel or engineering plastics to make.
3. lack the method that bundle steel strand tension stopping means is used for stretch-draw anchor for one kind, it is characterized in that: this method is to adopt claim 1 described by spike (2), the short bundle steel strand tension stopping means that back nut (3) and limiting plate (4) are formed carries out, the assembly of the stretch-draw of wanting is mainly by intermediate plate (5), anchor slab (6), nut (7), anchor plate (8) and steel strand (9) are formed, the spike (2) of stretch-draw stopping means is connected with jack (1) by bolt, realize the operation of stretch-draw for the first time and two times tensioning by the position of regulating back nut (3): during stretch-draw for the first time, back nut (3) withstands limiting plate (4) makes anchor slab (6) near anchor plate (8) end face, when putting for the first time anchoring, the limited anchoring of steel strand (9); When carrying out two times tensioning, regulate back nut (3) and leave (4) 10～20 millimeters distances of limiting plate, when making stretch-draw again to design load, anchor slab (6), intermediate plate (5) and limiting plate (4) can move after the freedom, screw nut (7) and can put an anchoring to anchor plate (8) end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100516405A CN101260741A (en) | 2007-03-05 | 2007-03-05 | Short bundle cable stretching caging device and method for stretching and anchoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100516405A CN101260741A (en) | 2007-03-05 | 2007-03-05 | Short bundle cable stretching caging device and method for stretching and anchoring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101260741A true CN101260741A (en) | 2008-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100516405A Pending CN101260741A (en) | 2007-03-05 | 2007-03-05 | Short bundle cable stretching caging device and method for stretching and anchoring |
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|---|---|
| CN (1) | CN101260741A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101725113B (en) * | 2009-12-08 | 2011-02-09 | 中铁大桥(郑州)缆索有限公司 | Two arm-brace stretching method of arc bridge tie bar cable |
| CN102776830A (en) * | 2012-08-10 | 2012-11-14 | 浙江省交通规划设计研究院 | Large-tonnage low-retraction pres-stress anchor and tightening device thereof |
| CN102912987A (en) * | 2012-11-09 | 2013-02-06 | 柳州市邱姆预应力机械有限公司 | Stress applying method and tool thereof for low retraction pre-stress concrete member |
| CN103266571A (en) * | 2013-05-31 | 2013-08-28 | 中交二航局第四工程有限公司安徽分公司 | Gap bridge type steel strand limiting device |
| CN103482521A (en) * | 2013-10-17 | 2014-01-01 | 中国核工业华兴建设有限公司 | Steel strand tensioning jack |
| CN108222376A (en) * | 2018-02-13 | 2018-06-29 | 柳州桂桥缆索有限公司 | A kind of steel strand connector and its application method of architectural engineering elder generation Zhang Liang |
| CN111472496A (en) * | 2020-04-11 | 2020-07-31 | 吴立新 | Low-retraction anchor with gasket for compensation retraction and tensioning method |
| CN111485676A (en) * | 2020-04-11 | 2020-08-04 | 吴立新 | Spiral supporting angle and cushion block supporting angle for tensioning low-retraction anchor |
| CN111485675A (en) * | 2020-04-11 | 2020-08-04 | 吴立新 | Low-retraction prestressed anchorage device and tensioning method |
| CN111928985A (en) * | 2020-08-06 | 2020-11-13 | 湖南省交通科学研究院有限公司 | Terminal control structure suitable for single prestressing steel under anchor |
| CN113387639A (en) * | 2021-05-26 | 2021-09-14 | 浙江中清大建筑产业化有限公司 | Prestressed hollow slab made of hard concrete |
-
2007
- 2007-03-05 CN CNA2007100516405A patent/CN101260741A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101725113B (en) * | 2009-12-08 | 2011-02-09 | 中铁大桥(郑州)缆索有限公司 | Two arm-brace stretching method of arc bridge tie bar cable |
| CN102776830A (en) * | 2012-08-10 | 2012-11-14 | 浙江省交通规划设计研究院 | Large-tonnage low-retraction pres-stress anchor and tightening device thereof |
| CN102912987B (en) * | 2012-11-09 | 2014-12-24 | 柳州市邱姆预应力机械有限公司 | Stress applying method and tool thereof for low retraction pre-stress concrete member |
| CN102912987A (en) * | 2012-11-09 | 2013-02-06 | 柳州市邱姆预应力机械有限公司 | Stress applying method and tool thereof for low retraction pre-stress concrete member |
| CN103266571B (en) * | 2013-05-31 | 2015-10-28 | 中交二航局第四工程有限公司安徽分公司 | A kind of gap bridge type steel strand stopping means |
| CN103266571A (en) * | 2013-05-31 | 2013-08-28 | 中交二航局第四工程有限公司安徽分公司 | Gap bridge type steel strand limiting device |
| CN103482521A (en) * | 2013-10-17 | 2014-01-01 | 中国核工业华兴建设有限公司 | Steel strand tensioning jack |
| CN108222376A (en) * | 2018-02-13 | 2018-06-29 | 柳州桂桥缆索有限公司 | A kind of steel strand connector and its application method of architectural engineering elder generation Zhang Liang |
| CN108222376B (en) * | 2018-02-13 | 2023-07-11 | 柳州桂桥缆索有限公司 | Steel strand connector for pre-tensioned beams used in construction engineering and using method thereof |
| CN111472496A (en) * | 2020-04-11 | 2020-07-31 | 吴立新 | Low-retraction anchor with gasket for compensation retraction and tensioning method |
| CN111485676A (en) * | 2020-04-11 | 2020-08-04 | 吴立新 | Spiral supporting angle and cushion block supporting angle for tensioning low-retraction anchor |
| CN111485675A (en) * | 2020-04-11 | 2020-08-04 | 吴立新 | Low-retraction prestressed anchorage device and tensioning method |
| CN111928985A (en) * | 2020-08-06 | 2020-11-13 | 湖南省交通科学研究院有限公司 | Terminal control structure suitable for single prestressing steel under anchor |
| CN113387639A (en) * | 2021-05-26 | 2021-09-14 | 浙江中清大建筑产业化有限公司 | Prestressed hollow slab made of hard concrete |
| CN113387639B (en) * | 2021-05-26 | 2022-05-03 | 浙江中清大建筑产业化有限公司 | Prestressed hollow slab made of hard concrete |
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| C06 | Publication | ||
| PB01 | Publication | ||
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Open date: 20080910 |