CN105064695A - Secondary tensioning and releasing device and method for prestressed tendons - Google Patents
Secondary tensioning and releasing device and method for prestressed tendons Download PDFInfo
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- CN105064695A CN105064695A CN201510504273.4A CN201510504273A CN105064695A CN 105064695 A CN105064695 A CN 105064695A CN 201510504273 A CN201510504273 A CN 201510504273A CN 105064695 A CN105064695 A CN 105064695A
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- steel
- presstressed reinforcing
- backing plate
- steel cylinder
- times tensioning
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 210000002435 tendon Anatomy 0.000 title claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 72
- 239000010959 steel Substances 0.000 claims abstract description 72
- 239000004576 sand Substances 0.000 claims abstract description 16
- 238000004873 anchoring Methods 0.000 claims abstract description 10
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 40
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 16
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 244000035744 Hura crepitans Species 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a secondary tensioning and releasing device and a secondary tensioning and releasing method for prestressed tendons. The invention has the technical effects that after the prestressed tendon passes through the device, fine sand is filled in the steel cylinder, and then the prestressed tendon is tensioned and anchored. When the tensioning needs to be compensated, the jack and the secondary tensioning base are utilized, and the anchoring prestress loss of the prestressed tendon is reduced by rotating the adjusting nut. When tension is required to be released, the single-head bolt is unscrewed to release sand, so that the tension of the prestressed tendon is released. The device is simple to operate, low in manufacturing cost, strong in safety and good in using effect. The method has wide practicability in secondary tensioning anchoring and releasing of single medium and short prestressed tendons in actual engineering construction and laboratories.
Description
Technical field
The present invention relates to a kind of presstressed reinforcing steel two times tensioning and put an apparatus and method, 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.
Summary of the invention
For solving the problems of the technologies described above, technical scheme of the present invention 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 patent of the present invention 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 invention;
Fig. 2 is sectional drawing of the present invention;
Fig. 3 is overall work schematic diagram of the present invention;
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 present invention includes 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.
Work process is: the first step, and the present invention 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 (3)
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.
3. presstressed reinforcing steel two times tensioning and a method of to put, is characterized in that, adopt device as claimed in claim 1 or 2, comprise 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510504273.4A CN105064695B (en) | 2015-08-17 | 2015-08-17 | Secondary tensioning and releasing device and method for prestressed tendons |
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| CN201510504273.4A CN105064695B (en) | 2015-08-17 | 2015-08-17 | Secondary tensioning and releasing device and method for prestressed tendons |
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| CN105064695A true CN105064695A (en) | 2015-11-18 |
| CN105064695B CN105064695B (en) | 2017-07-04 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105881737A (en) * | 2016-06-02 | 2016-08-24 | 福建省大地管桩有限公司 | Device and method for integrally releasing and stretching pre-stressed concrete sheet pile |
| CN106671268A (en) * | 2016-06-16 | 2017-05-17 | 山西高行液压股份有限公司 | Pre-tensioning track plate rebar stretch-draw and extending device |
| CN109507049A (en) * | 2018-12-04 | 2019-03-22 | 中冶建筑研究总院有限公司 | A kind of the prestressing force loading device and loading method of component |
| CN110565546A (en) * | 2019-09-09 | 2019-12-13 | 长沙理工大学 | Detachable device for assembling prestress for bridge structure and reinforcing method |
| CN111101713A (en) * | 2020-01-14 | 2020-05-05 | 福建省大地管桩有限公司 | Applying device and applying method for prestress of concrete member |
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| JP2011184894A (en) * | 2010-03-05 | 2011-09-22 | Ps Mitsubishi Construction Co Ltd | Anchorage device for prestressing tendon, and method for repairing existing prestressed concrete structure |
| CN203145324U (en) * | 2013-03-15 | 2013-08-21 | 长沙理工大学 | Controllable prestressed tendon tensioning anchorage for test |
| CN103556785A (en) * | 2013-11-25 | 2014-02-05 | 哈尔滨工业大学 | Retraction compensating type nut clamping piece anchor as well as anchor tensioning method |
| CN103850441A (en) * | 2014-03-19 | 2014-06-11 | 郭成顺 | Tensioning construction method and tensioning device of prestressed concrete structure |
| CN203665700U (en) * | 2014-01-20 | 2014-06-25 | 郭成顺 | Sandbox distributed pretensioning bed |
| CN104831634A (en) * | 2015-05-18 | 2015-08-12 | 湖南路桥建设集团有限责任公司 | Construction method for box type bridge vertical prestressed steel strand tension |
| CN204920236U (en) * | 2015-08-17 | 2015-12-30 | 长沙理工大学 | Secondary tensioning and releasing device for prestressed tendons |
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2015
- 2015-08-17 CN CN201510504273.4A patent/CN105064695B/en active Active
Patent Citations (7)
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| JP2011184894A (en) * | 2010-03-05 | 2011-09-22 | Ps Mitsubishi Construction Co Ltd | Anchorage device for prestressing tendon, and method for repairing existing prestressed concrete structure |
| CN203145324U (en) * | 2013-03-15 | 2013-08-21 | 长沙理工大学 | Controllable prestressed tendon tensioning anchorage for test |
| CN103556785A (en) * | 2013-11-25 | 2014-02-05 | 哈尔滨工业大学 | Retraction compensating type nut clamping piece anchor as well as anchor tensioning method |
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| CN204920236U (en) * | 2015-08-17 | 2015-12-30 | 长沙理工大学 | Secondary tensioning and releasing device for prestressed tendons |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105881737A (en) * | 2016-06-02 | 2016-08-24 | 福建省大地管桩有限公司 | Device and method for integrally releasing and stretching pre-stressed concrete sheet pile |
| CN105881737B (en) * | 2016-06-02 | 2018-04-27 | 福建省大地管桩有限公司 | A kind of prestressed concrete plate stake Integral tension device and method |
| CN106671268A (en) * | 2016-06-16 | 2017-05-17 | 山西高行液压股份有限公司 | Pre-tensioning track plate rebar stretch-draw and extending device |
| CN109507049A (en) * | 2018-12-04 | 2019-03-22 | 中冶建筑研究总院有限公司 | A kind of the prestressing force loading device and loading method of component |
| CN110565546A (en) * | 2019-09-09 | 2019-12-13 | 长沙理工大学 | Detachable device for assembling prestress for bridge structure and reinforcing method |
| CN110565546B (en) * | 2019-09-09 | 2024-04-16 | 长沙理工大学 | Detachable device for assembling prestress for bridge structure and reinforcing method |
| CN111101713A (en) * | 2020-01-14 | 2020-05-05 | 福建省大地管桩有限公司 | Applying device and applying method for prestress of concrete member |
| CN111101713B (en) * | 2020-01-14 | 2024-01-02 | 福建省大地管桩有限公司 | Device and method for applying prestress to concrete member |
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| Publication number | Publication date |
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| CN105064695B (en) | 2017-07-04 |
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