CN201033945Y - Short strand wire stretching stopping means - Google Patents
Short strand wire stretching stopping means Download PDFInfo
- Publication number
- CN201033945Y CN201033945Y CNU2007200837280U CN200720083728U CN201033945Y CN 201033945 Y CN201033945 Y CN 201033945Y CN U2007200837280 U CNU2007200837280 U CN U2007200837280U CN 200720083728 U CN200720083728 U CN 200720083728U CN 201033945 Y CN201033945 Y CN 201033945Y
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- CN
- China
- Prior art keywords
- spike
- steel strand
- back nut
- limiting plate
- arm brace
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Abstract
The utility model relates to a short strand steel strand stretched caging device, comprising an arm brace, a support nut and a stop plate. The arm brace is a cylinder with two symmetrically positioned windows, inside which screw thread is provided. The support nut inside the arm brace is a section of a ring, wherein, one to eight through holes for regulating the position of the support nut are evenly arranged on the central circumference. The support nut is also provided with an outer screw thread matched with the inner screw thread on the arm brace and connected with the arm brace. A plurality of through holes used for the steel strand to pass through are evenly distributed in the middle of the flat cylindrical stop plate with a concave terrace at the end. The number of the through holes on the stop plate is in accordance with that of the jaw on the anchor slab of the stretched anchorage assembly. The stop plate is positioned inside the arm brace and is connected in neighborhood with the support nut. When being stretched, the arm brace at the position of the stretched caging device is connected with the jack through the bolt, enabling the first stretch and the second stretch by adjusting the position of the support nut without replacing the jack. The utility model has the advantages of simple structure and convenient construction method.
Description
Technical field:
The utility model relates to a kind of auxiliary tensioner of presstressed reinforcing steel, particularly a kind of short bundle steel strand tension stopping means.
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.
The utility model content:
The technical problems to be solved in the utility model is: a kind of short bundle steel strand tension stopping means 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 to regulate the back nut position, on also be provided 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.
The spike inner circle of the weak point bundle steel strand tension stopping means of the utility model 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, the technical characterictic to the weak point of the utility model bundle steel strand tension stopping means is further described in conjunction with the accompanying drawings and embodiments.
Description of drawings:
Fig. 1: the structure and the user mode reference diagram of the weak point bundle steel strand tension stopping means of the utility model;
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:
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 utility model embodiment, 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 utility model embodiment, 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 available steel is done, and the engineering plastics that can also adopt cast iron, alloy steel or have a sufficient intensity are made.
It is spacing that the weak point bundle steel strand tension stopping means of the utility model also can be used for other stretch-draw of lacking the bundle presstressed reinforcing steels.
Claims (2)
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200837280U CN201033945Y (en) | 2007-03-05 | 2007-03-05 | Short strand wire stretching stopping means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200837280U CN201033945Y (en) | 2007-03-05 | 2007-03-05 | Short strand wire stretching stopping means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201033945Y true CN201033945Y (en) | 2008-03-12 |
Family
ID=39194836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200837280U Expired - Fee Related CN201033945Y (en) | 2007-03-05 | 2007-03-05 | Short strand wire stretching stopping means |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201033945Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101886477A (en) * | 2010-07-09 | 2010-11-17 | 中冶建工有限公司 | Prestressed tensioning group anchorage single-hole limiting plate |
| CN102943437A (en) * | 2012-12-04 | 2013-02-27 | 中铁二十一局集团有限公司 | Device for limiting and protecting anchoring end of vertical steel strand |
| 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 |
| CN105040985A (en) * | 2015-08-14 | 2015-11-11 | 山东大学 | Detecting system and method for vertical precision rolling screw-thread steel tensioning force under anchor |
| CN112227223A (en) * | 2020-11-09 | 2021-01-15 | 北京工业大学 | One-time jacking reverse support device of low-retraction anchorage device |
-
2007
- 2007-03-05 CN CNU2007200837280U patent/CN201033945Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101886477A (en) * | 2010-07-09 | 2010-11-17 | 中冶建工有限公司 | Prestressed tensioning group anchorage single-hole limiting plate |
| CN101886477B (en) * | 2010-07-09 | 2011-08-17 | 中冶建工有限公司 | Prestressed tensioning group anchorage single-hole limiting plate |
| CN102943437A (en) * | 2012-12-04 | 2013-02-27 | 中铁二十一局集团有限公司 | Device for limiting and protecting anchoring end of vertical steel strand |
| 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 |
| 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 |
| CN105040985A (en) * | 2015-08-14 | 2015-11-11 | 山东大学 | Detecting system and method for vertical precision rolling screw-thread steel tensioning force under anchor |
| CN112227223A (en) * | 2020-11-09 | 2021-01-15 | 北京工业大学 | One-time jacking reverse support device of low-retraction anchorage device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080312 Termination date: 20160305 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |