CN204920236U - Stretch -draw of prestressing tendons secondary with put a device - Google Patents
Stretch -draw of prestressing tendons secondary with put a device Download PDFInfo
- Publication number
- CN204920236U CN204920236U CN201520618809.0U CN201520618809U CN204920236U CN 204920236 U CN204920236 U CN 204920236U CN 201520618809 U CN201520618809 U CN 201520618809U CN 204920236 U CN204920236 U CN 204920236U
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- steel
- stretch
- draw
- backing plate
- presstressed reinforcing
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Abstract
The utility model discloses a stretch -draw of prestressing tendons secondary with put a device, the device comprises nut, hollow double -screw bolt, circular billet, steel drum, steel ring, single -end bolt, secondary stretch -draw base. The technical effects of the utility model comprises, after prestressing tendons passes this device, at the built -in fine sand of steel drum, then carry out prestressing tendons's stretch -draw anchor. In the time of stretch -draw need being mended, utilize jack and secondary stretch -draw base, through the anchor loss of prestress of rotated adjusting nut in order to reduce prestressing tendons. In the time of need putting, thereby unload sand and realize that prestressing tendons is put and open through unscrewing the single -end bolt. The device easy operation, cost are hanged down, the security is strong, excellent in use effect. In actual engineering construction, laboratory dan genzhong, shortly have extensive practicality in the aspect of restrainting prestressing tendons secondary stretch -draw anchor and putting.
Description
Technical field
The utility model relates to a kind of presstressed reinforcing steel two times tensioning and puts a device, be particularly useful for single in Practical Project and laboratory in, benefit stretch-draw in short bundle tension of prestressed tendon anchoring procedure and to put.
Background technology
At present, in, short bundle presstressed reinforcing steel uses very extensive in actual engineering design, construction, reinforcing and laboratory research process.But, in, the loss of prestress that causes because ground tackle bounces back of short bundle presstressed reinforcing steel is very serious.There is improving one's methods of some presstressed reinforcing steel anchorings in recent years, such as, increased holding nut outward at traditional anchor cup, having kept the stress level after mending stretch-draw by mending stretch-draw screwed support nut.The method need make the ground tackle of band holding nut, costly.Also have device to adopt band breach pad to bounce back to prevent presstressed reinforcing steel, weak point to coordinate multi-thickness pad to use, and anchoring precision is difficult to control.In addition, open about putting of presstressed reinforcing steel, traditional method comprises sandbox method and jack method.The former device is complicated and uneconomical, and latter repeatedly need be put by hydraulic jack and open, and operational sequence is loaded down with trivial details, and tension stress is difficult to control, and sometimes must could realize under ultra stretching situation, there is potential safety hazard.
Utility model content
For solving the problems of the technologies described above, the technical solution of the utility model is, a kind of presstressed reinforcing steel two times tensioning with put a device, comprise nut, hollow stud, circular steel backing plate, steel cylinder, steel annulus, single ended bolt and two times tensioning pedestal, described hollow stud, circular steel backing plate, steel cylinder all has the through hole passed for presstressed reinforcing steel at the circle centre position of radial section, the diameter of hollow stud and circular steel backing plate is not less than the internal diameter of steel cylinder, the end of one end of steel cylinder stacks with circular steel backing plate and hollow stud concentric and is integrally fixed successively, described nut mates with hollow stud and is threaded connection, described steel annulus central authorities leave for the annular distance by presstressed reinforcing steel, the external diameter of steel annulus is equal with steel barrel bore and be arranged in the end of the steel cylinder other end, steel cylinder has at least one for screwing in the screw of single ended bolt on the sidewall near circular steel backing plate, injected fine sand by screw and screwed in single ended bolt during tension of prestressed tendon and close steel cylinder, fine sand is discharged by screw when to put, described two times tensioning pedestal covers in steel cylinder when carrying out two times tensioning outer with support jack.
Described a kind of presstressed reinforcing steel two times tensioning with put a device, the quantity of described screw is 4, and on steel cylinder side wall spaced set.
Presstressed reinforcing steel two times tensioning and a method of to put, the device described in employing, comprises the following steps:
Step one: the hollow stud be fixed as one, circular steel backing plate, steel cylinder are placed in stretching end, nut is threaded onto on hollow stud, supporting backing plate is located on concrete component, nut contact supports backing plate, steel annulus is located at the end of steel cylinder, and makes presstressed reinforcing steel pass support backing plate, nut, hollow stud, circular steel backing plate, steel cylinder and steel annulus;
Step 2: presstressed reinforcing steel is good in the anchoring of non-stretching end ground tackle;
Step 3: install anchor cup, intermediate plate and jack, before Shi Hanzhang, turn on a single ended bolt, pour into fine sand densely in steel cylinder, then twists good bolt;
Step 4: utilize jack and intermediate plate to carry out stretch-draw and the anchoring of presstressed reinforcing steel;
Step 5: when carrying out two times tensioning, two times tensioning pedestal is installed, base lugs is directly supported in and supports on backing plate, jack leading portion is supported in two times tensioning pedestal, be stretched to proof stress, can produce the gap of presstressed reinforcing steel axis direction in this process between anchor cup and steel annulus, tightening nut blind, to keep the stress level after mending stretch-draw, is put to open and is taken off jack and two times tensioning pedestal;
A step 6: when carrying out putting, single ended bolt is turned on and carries out unloading sand, after fine sand is unsnatched, namely produce the space of shrinking for presstressed reinforcing steel in steel cylinder, thus lay down the intermediate plate ground tackle at two ends smoothly, by intact for presstressed reinforcing steel taking-up.
The technique effect of the utility model patent is: when carrying out two times tensioning, by jack and two times tensioning pedestal, by rotating adjusting nut blind, when making up stretch-draw first, ground tackle bounces back the loss of prestress caused, pass through regulating nut, the effect that loss of prestress is less than 2% can be reached, thus greatly improve prestress anchoraging precision.Carry out presstressed reinforcing steel when to put, without the need to ultra stretching, under original stress level, turn on single ended bolt by spanner and carry out unloading sand, can to put presstressed reinforcing steel.It is simple to operate, and cost is low, high safety, and result of use is good, can be widely used in Practical Project and laboratory single in, the two times tensioning of short bundle presstressed reinforcing steel with to put.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is sectional drawing of the present utility model;
Fig. 3 is overall work schematic diagram of the present utility model.
In figure, 1 be nut, 2 for hollow stud, 3 for circular steel backing plate, 4 for steel cylinder, 5 for steel annulus, 6 for single ended bolt, 7 for two times tensioning pedestal, 8 for anchor cup, 9 for intermediate plate, 10 for presstressed reinforcing steel, 11 for jack, 12 for support backing plate.
Detailed description of the invention
See Fig. 1, Fig. 2, the utility model comprises nut 1, hollow stud 2, circular steel backing plate 3, steel cylinder 4, steel annulus 5, single ended bolt 6, two times tensioning pedestal 7.Described hollow stud 2, circular steel backing plate 3, steel cylinder 4 are welded into entirety, nut 1 and hollow stud 2 support the use, described circular steel backing plate 3 and steel annulus 5 are all in central openings, add hollow stud 2, the alignment of three's circular hole is passed for presstressed reinforcing steel 10, the external diameter of described steel annulus 5 and steel cylinder 4 internal diameter equal and opposite in direction, steel annulus 5 is for bearing the active force of presstressed reinforcing steel ground tackle 8, described steel cylinder 4 opens four circular holes equally spacedly on the sidewall near welding ends, and circular hole establishes screw thread to use to coordinate single ended bolt 6.
See Fig. 3, work process is: the first step, and the utility model is placed in stretching end, and presstressed reinforcing steel is through this device; Second step is good in the anchoring of non-stretching end ground tackle; 3rd step, after the pulling preparation work of presstressed reinforcing steel completes, before Shi Hanzhang, turns on a single ended bolt 6, pours into fine sand and make it closely knit, then twists good bolt 6; 4th step, utilizes jack 11 and intermediate plate 9 to carry out the stretch-draw anchor of presstressed reinforcing steel 10, the now bang path of power: intermediate plate and anchor cup → this device → support backing plate → concrete component; 5th step, when carrying out two times tensioning, two times tensioning pedestal 7 is installed, make base lugs directly be supported on backing plate 12, jack leading portion is supported in two times tensioning pedestal 7, is stretched to proof stress, gap can be produced between anchor cup 8 and steel annulus 5 in this process, tightening nut 1 blind, to keep the stress level after mending stretch-draw, is put to open and is taken off jack 11 and two times tensioning pedestal 7, the now bang path of power: intermediate plate and anchor cup → this device → support backing plate → concrete component; 4 single ended bolt, when carrying out putting, are turned on and are carried out unloading sand by the 6th step.After fine sand is unsnatched, certain space can be reserved in device and shrink for presstressed reinforcing steel, thus lay down the intermediate plate ground tackle at two ends smoothly, by intact for presstressed reinforcing steel taking-up.
Claims (2)
1. a presstressed reinforcing steel two times tensioning with put a device, it is characterized in that, comprise nut, hollow stud, circular steel backing plate, steel cylinder, steel annulus, single ended bolt and two times tensioning pedestal, described hollow stud, circular steel backing plate, steel cylinder all has the through hole passed for presstressed reinforcing steel at the circle centre position of radial section, the diameter of hollow stud and circular steel backing plate is not less than the internal diameter of steel cylinder, the end of one end of steel cylinder stacks with circular steel backing plate and hollow stud concentric and is integrally fixed successively, described nut mates with hollow stud and is threaded connection, described steel annulus central authorities leave for the annular distance by presstressed reinforcing steel, the external diameter of steel annulus is equal with steel barrel bore and be arranged in the end of the steel cylinder other end, steel cylinder has at least one for screwing in the screw of single ended bolt on the sidewall near circular steel backing plate, injected fine sand by screw and screwed in single ended bolt during tension of prestressed tendon and close steel cylinder, fine sand is discharged by screw when to put, described two times tensioning pedestal covers in steel cylinder when carrying out two times tensioning outer with support jack.
2. a kind of presstressed reinforcing steel two times tensioning according to claim 1 with put a device, it is characterized in that, the quantity of described screw is 4, and on steel cylinder side wall spaced set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520618809.0U CN204920236U (en) | 2015-08-17 | 2015-08-17 | Stretch -draw of prestressing tendons secondary with put a device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520618809.0U CN204920236U (en) | 2015-08-17 | 2015-08-17 | Stretch -draw of prestressing tendons secondary with put a device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204920236U true CN204920236U (en) | 2015-12-30 |
Family
ID=54969374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520618809.0U Withdrawn - After Issue CN204920236U (en) | 2015-08-17 | 2015-08-17 | Stretch -draw of prestressing tendons secondary with put a device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204920236U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105064695A (en) * | 2015-08-17 | 2015-11-18 | 长沙理工大学 | Secondary tensioning and tension releasing device and method for prestressed tendon |
| CN105651684A (en) * | 2016-04-12 | 2016-06-08 | 宁波市镇海垚森土木工程技术服务有限公司 | Method for detecting friction loss and anchoring loss of post-tensioned pre-stressing concrete structure |
| CN110029592A (en) * | 2019-04-12 | 2019-07-19 | 长沙理工大学 | A kind of external prestressing FRP tendons stretching and anchoring device |
-
2015
- 2015-08-17 CN CN201520618809.0U patent/CN204920236U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105064695A (en) * | 2015-08-17 | 2015-11-18 | 长沙理工大学 | Secondary tensioning and tension releasing device and method for prestressed tendon |
| CN105651684A (en) * | 2016-04-12 | 2016-06-08 | 宁波市镇海垚森土木工程技术服务有限公司 | Method for detecting friction loss and anchoring loss of post-tensioned pre-stressing concrete structure |
| CN110029592A (en) * | 2019-04-12 | 2019-07-19 | 长沙理工大学 | A kind of external prestressing FRP tendons stretching and anchoring device |
| CN110029592B (en) * | 2019-04-12 | 2024-01-30 | 长沙理工大学 | External prestress FRP rib tensioning and anchoring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151230 Effective date of abandoning: 20170704 |
|
| AV01 | Patent right actively abandoned |