CN105019662A - Rebar-breaking treatment method of unbonded pre-stressed steel stranded wires for pre-stressed construction - Google Patents
Rebar-breaking treatment method of unbonded pre-stressed steel stranded wires for pre-stressed construction Download PDFInfo
- Publication number
- CN105019662A CN105019662A CN201510351638.4A CN201510351638A CN105019662A CN 105019662 A CN105019662 A CN 105019662A CN 201510351638 A CN201510351638 A CN 201510351638A CN 105019662 A CN105019662 A CN 105019662A
- Authority
- CN
- China
- Prior art keywords
- prestress
- line segment
- steel stranded
- twist line
- stressed steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a rebar-breaking treatment method of unbonded pre-stressed steel stranded wires for pre-stressed construction, pertaining to the technical field of building construction with the purpose of solving the problem that unbonded pre-stressed steel stranded wires fail to effectively apply pre-stressing force again after rebar-breaking operation. The treatment method comprises following steps of: firstly, arranging rectangular grooves in beams which are close to stretching ends of the pre-stressed steel stranded wires for certain distance and keep away from frame beams and then completely exposing a segment of pre-stressed steel stranded wires located in each rectangular groove; secondly, cutting off a segment of pre-stressed steel stranded wires located in each rectangular groove into two sections including a first pre-stressed steel stranded wire segment and a second pre-stressed steel stranded wire segment; adopting a third pre-stressed steel stranded wire segment longer than each second pre-stressed steel stranded wire segment to replace the above second pre-stressed steel stranded wire segment and fixedly connecting each third pre-stressed steel stranded wire segment with each first pre-stressed steel stranded wire segment to form a novel pre-stressed steel stranded wire; finally, installing anchorage devices at stretching ends and stretching and drawing novel pre-stressed steel stranded wires in order to apply pre-stressing force.
Description
Technical field
The invention belongs to technical field of building construction, the un-bonded prestressed steel strand particularly related in a kind of pre-stress construction breaks muscle processing method.
Background technology
The shrinkage joint spacing of overlength, super large build reinforced concrete structure, much larger than the regulation of current specifications, therefore, when constructing its lower layer of and one deck floor, needs the structural cracks taking measures to control because variations in temperature and concrete shrinkage produce.Non-cohesive Prestressing Force Technology can be used for many, Bases in High Building Construction building cover structure, sole plate, basement wall slab etc., to resist the crack that large span or overlength degree concrete structure produce under the effects such as load, temperature or contraction, improve the performance of structure, component.Unbonded prestressing tendon or prestress wire (being referred to as prestress wire below) are configured in concrete structure, reach after some strength until hardening of concrete, adopt Special ground tackle by stretching force permanent anchorage in concrete structure by stretch-draw prestressing force steel strand.Prestressed anchor comprise with the use of stretching end ground tackle and fixed end ground tackle.Wherein, stretching end anchorage installation, in one end of prestress wire, its role is to keep the pulling force of prestress wire and be delivered to inside concrete; Fixed end anchorage installation prestress wire the other end and not in order to stretch-draw.
But, in Non-cohesive Prestressing Force Technology construction, after un-bonded prestressed steel strand Shi Hanzhang, adhesion stress is not had between prestress wire and its reserving hole channel in concrete component, prestressing force is all by the ground tackle transmission at two ends, thus when carrying out un-bonded prestressed steel strand stretch-draw, there will be the phenomenon of Vierendeel girder steel bars stretching end ground tackle and then cut-out un-bonded prestressed steel strand.Namely can because of stretching end ground tackle and the distance between un-bonded prestressed steel strand and Vierendeel girder reinforcing bar too small, thus when causing stretch-draw, stretching end ground tackle occurs by Vierendeel girder steel bars to cut off the phenomenon of prestress wire.Often adopt in prior art and change the method for whole prestress wire and solve prestress wire and to break the problem of muscle.Like this, construction cost is added.Therefore, to break muscle problem for the un-bonded prestressed steel strand in prestress engineering construction, how to provide the muscle processing method of breaking of the un-bonded prestressed steel strand in the low pre-stress construction of a kind of cost to be the technical barrier that those skilled in the art need solution badly.
Summary of the invention
The object of the present invention is to provide and a kind ofly to break muscle processing method without the need to changing un-bonded prestressed steel strand in low, the easy to operate pre-stress construction of prestress wire, cost, cannot the difficult problem of effective Shi Hanzhang again to solve that un-bonded prestressed steel strand breaks after muscle.
To achieve these goals, technical scheme of the present invention is:
Un-bonded prestressed steel strand in pre-stress construction breaks the situation of a muscle processing method, the muscle that breaks at stretching end ground tackle place for the treatment of described prestress wire, comprises the steps:
Step one, near described prestress wire stretching end a distance the beam avoiding Vierendeel girder offering a rectangular channel, and the one section of described prestress wire being positioned at described rectangular channel is come out completely;
Step 2, the one section of described prestress wire being positioned at described rectangular channel is cut to two sections, is respectively the first prestress steel twist line segment away from described stretching end and the second prestress steel twist line segment near described stretching end;
Step 3, take out described second prestress steel twist line segment, and change to the 3rd prestress steel twist line segment, described 3rd prestress steel twist line segment and described first prestress steel twist line segment are fixedly connected to form new prestress wire, wherein, the length of described 3rd prestress steel twist line segment is greater than the length of described second prestress steel twist line segment;
Step 4, at described stretching end place, again new described in the stretch-draw prestress wire of ground tackle is installed, with Shi Hanzhang.
Further, described certain distance is 2000mm-3000mm.
Further, the bond length of described rectangular channel is the half of its long edge lengths, and the long limit of described rectangular channel and described prestress steel twist line parallel.
Further, described step 3 comprises and connects described first prestress steel twist line segment and described second prestress steel twist line segment by single hole connector.
Further, in described step 4, when needing bending described new prestress wire because of stretch-draw, described prestress wire is respectively all not less than 6.5m to the radius of curvature of skew.
Further, the length of described rectangular channel is 30cm, and width is 15cm.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention: the un-bonded prestressed steel strand in pre-stress construction of the present invention breaks the situation of muscle processing method, the muscle that breaks at stretching end ground tackle place for the treatment of prestress wire.This processing method, first near prestress wire stretching end a distance the beam avoiding Vierendeel girder is offering a rectangular channel, and the one section of prestress wire being positioned at rectangular channel is come out completely; Then the one section of prestress wire being positioned at rectangular channel is cut to two sections, is respectively the first prestress steel twist line segment away from stretching end and the second prestress steel twist line segment near stretching end; Then the 3rd prestress steel twist line segment adopting length to be greater than the second prestress steel twist line segment replaces the second prestress steel twist line segment, and the 3rd prestress steel twist line segment and the first prestress steel twist line segment is fixedly connected to form new prestress wire and carrys out Shi Hanzhang finally by installing the ground tackle prestress wire that stretch-draw is new again at stretching end place.Un-bonded prestressed steel strand in pre-stress construction of the present invention breaks muscle processing method, be applicable to process prestress wire to break at stretching end ground tackle place the situation of muscle, easy construction, safe and reliable, adopt part to replace the mode of prestress wire, efficiently solve when not affecting construction quality and construction speed un-bonded prestressed steel strand in pre-stress construction be pulled off after cannot the difficult problem of effective Shi Hanzhang again.
Accompanying drawing explanation
Un-bonded prestressed steel strand in pre-stress construction of the present invention muscle processing method of breaking is provided by following embodiment and accompanying drawing.
Fig. 1 is the schematic diagram of the un-bonded prestressed steel strand prestressed stretch-draw in one embodiment of the invention in pre-stress construction;
Fig. 2 is the A-A sectional view of Fig. 1.
In figure:
1-beam; 2-stretching end ground tackle; 3-steel strand.
Detailed description of the invention
Un-bonded prestressed steel strand in the pre-stress construction proposed the present invention below in conjunction with the drawings and specific embodiments muscle processing method of breaking is described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.Need to illustrate in addition, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.For sake of convenience, hereinafter described " on ", D score is consistent with the upper and lower direction of accompanying drawing, but this can not become the restriction of technical solution of the present invention.
Embodiment one
In the prestress engineering of the present embodiment, mainly adopt the form of tensioned at one end to beam Shi Hanzhang.In the process of Shi Hanzhang, often because ground tackle and intermediate plate not closely connected; Or ground tackle, steel strand distance Vierendeel girder reinforcing bar is comparatively near, and then when causing stretch-draw, ground tackle is subject to Vierendeel girder steel bars thus the situation of steel strand fracture occurs.After compressive strength of concrete in prestressed girder is not less than 80% of concrete design strength, carry out prestressed stretch-draw.But according to job specfication: one is to post tensioning structure component, the presstressed reinforcing steel quantity of fracture or slippage is forbidden to exceed 3% of the total radical of same cross section presstressed reinforcing steel, and the presstressed reinforcing steel often restrainting fracture must not more than one; To multispan two-way continuous slab, its same cross section should by often across calculating; Two is to pretensioned precast element, and the presstressed reinforcing steel that fracture or slippage occur before concreting must be changed.For in prestress engineering, there is the problem of presstressed reinforcing steel fracture, the invention provides a kind of non-bending steel cable fracture processing method, Vierendeel girder is avoided in employing, slot in beam, part carries out the mode of stretch-draw after replacing steel strand, not only solve a difficult problem for prestress application, and also less on the impact of the concrete structure of having constructed
To break muscle processing method below in conjunction with Fig. 1 and Fig. 2 un-bonded prestressed steel strand described in detail in pre-stress construction of the present invention.
As depicted in figs. 1 and 2, the un-bonded prestressed steel strand in a kind of pre-stress construction breaks the situation of muscle processing method, the muscle that breaks at stretching end ground tackle 2 place for the treatment of prestress wire, comprises the steps:
S001: near prestress wire 3 stretching end a distance the beam 1 avoiding Vierendeel girder offering a rectangular channel (not shown), and the one section of prestress wire being positioned at rectangular channel is come out completely;
S002: the one section of prestress wire being positioned at rectangular channel is cut to two sections, is respectively the first prestress steel twist line segment away from stretching end and the second prestress steel twist line segment near stretching end;
S003: take out the second prestress steel twist line segment, and change to the 3rd prestress steel twist line segment, 3rd prestress steel twist line segment and the first prestress steel twist line segment are fixedly connected to form new prestress wire, wherein, the length of the 3rd prestress steel twist line segment is greater than the length of the second prestress steel twist line segment;
S004: install the ground tackle prestress wire that stretch-draw is new again at stretching end place, with Shi Hanzhang.
Specifically, for the mode processing disconnected muscle in prestress engineering in prior art by replacing whole prestress wire in the present embodiment, provide a kind of convenient, cost-effective disconnected muscle processing method, replace without the need to carrying out entirety to the prestress wire of fracture, but local is replaced to be fixed with the one section of prestress wire do not changed after prestress wire and is connected to form one whole new steel strand, then Shi Hanzhang is until reach designing requirement.That is, work as Shi Hanzhang, during stretch-draw prestressing force steel strand, fracture is there is in prestress wire at stretching end ground tackle place, according to design specifications, need to change this prestress wire, the present embodiment does not have whole to replace prestress wire, but Vierendeel girder is avoided in employing, slot in the beam of a distance near stretching end, cut off steel strand, retain one section of steel strand away from stretching end, the one section steel strand of rectangular channel to stretching end are replaced, and the one section of steel strand retained are fixed are connected with one section of steel strand after replacement, thus achieve part and replace steel strand and can solve because stretch-draw causes prestress wire to break the difficult problem of muscle, and it is also less on the impact of the concrete structure of having constructed.
Certainly, in order to reduce the impact on the concrete structure of having constructed as far as possible, the certain distance of rectangular channel and stretching end is 2000mm-3000mm.
Preferably, owing to needing to become away from the first prestress steel twist line segment of stretching end with near the second prestress steel twist line segment at the former prestress wire of rectangular channel internal cutting off, the 3rd prestress steel twist line segment being greater than the second prestress steel twist line segment by length replaces the second prestress steel twist line segment, and the first prestress steel twist line segment is fixedly connected with the 3rd prestress steel twist line segment, therefore in order to easy construction, the bond length of rectangular channel is the half of its long edge lengths, and the long limit of rectangular channel and prestress steel twist line parallel.Certainly, the size of rectangular channel is decided by the size of the diameter of steel strand, the size of steel strand connector and operating space.Such as, the length of rectangular channel is 30cm, and width is 15cm.Considering easy to operate and save cost, is single hole connector for connecting the connector of the first prestress steel twist line segment and the 3rd prestress steel twist line segment.
Especially, after new prestress wire has been laid, when needing bending new prestress wire because of stretch-draw, prestress wire is respectively all not less than 6.5m to the radius of curvature of skew.
In sum, the un-bonded prestressed steel strand in pre-stress construction of the present invention breaks the situation of muscle processing method, the muscle that breaks at stretching end ground tackle place for the treatment of prestress wire.Un-bonded prestressed steel strand in pre-stress construction breaks muscle processing method, first near prestress wire stretching end a distance the beam avoiding Vierendeel girder offering a rectangular channel, and the one section of prestress wire being positioned at rectangular channel is come out completely; Then the one section of prestress wire being positioned at rectangular channel is cut to two sections, is respectively the first prestress steel twist line segment away from stretching end and the second prestress steel twist line segment near stretching end; Then the 3rd prestress steel twist line segment adopting length to be greater than the second prestress steel twist line segment replaces the second prestress steel twist line segment, and the 3rd prestress steel twist line segment and the first prestress steel twist line segment is fixedly connected to form new prestress wire and carrys out Shi Hanzhang finally by installing the ground tackle prestress wire that stretch-draw is new again at stretching end place.Un-bonded prestressed steel strand in pre-stress construction of the present invention breaks muscle processing method, be applicable to process prestress wire to break at stretching end ground tackle place the situation of muscle, easy construction, safe and reliable, adopt part to replace the mode of prestress wire, efficiently solve when not affecting construction quality and construction speed un-bonded prestressed steel strand in pre-stress construction be pulled off after cannot the difficult problem of effective Shi Hanzhang again.
Foregoing description is only the description to present pre-ferred embodiments, any restriction not to the scope of the invention.Any change that those skilled in the art does according to above-mentioned disclosure, modification, all belong to the protection domain of claim.
Claims (6)
1. the un-bonded prestressed steel strand in pre-stress construction breaks the situation of a muscle processing method, the muscle that breaks at stretching end ground tackle place for the treatment of described prestress wire, it is characterized in that, comprises the steps:
Step one, near described prestress wire stretching end a distance the beam avoiding Vierendeel girder offering a rectangular channel, and the one section of described prestress wire being positioned at described rectangular channel is come out completely;
Step 2, the one section of described prestress wire being positioned at described rectangular channel is cut to two sections, is respectively the first prestress steel twist line segment away from described stretching end and the second prestress steel twist line segment near described stretching end;
Step 3, take out described second prestress steel twist line segment, and change to the 3rd prestress steel twist line segment, described 3rd prestress steel twist line segment and described first prestress steel twist line segment are fixedly connected to form new prestress wire, wherein, the length of described 3rd prestress steel twist line segment is greater than the length of described second prestress steel twist line segment;
Step 4, at described stretching end place, again new described in the stretch-draw prestress wire of ground tackle is installed, with Shi Hanzhang.
2. the un-bonded prestressed steel strand in pre-stress construction as claimed in claim 1 breaks muscle processing method, and it is characterized in that, described certain distance is 2000mm-3000mm.
3. the un-bonded prestressed steel strand in pre-stress construction as claimed in claim 1 breaks muscle processing method, and it is characterized in that, the bond length of described rectangular channel is the half of its long edge lengths, and the long limit of described rectangular channel and described prestress steel twist line parallel.
4. the un-bonded prestressed steel strand in the pre-stress construction as described in any one of claims 1 to 3 breaks muscle processing method, it is characterized in that, described step 3 comprises and connects described first prestress steel twist line segment and described second prestress steel twist line segment by single hole connector.
5. the un-bonded prestressed steel strand in the pre-stress construction as described in any one of claims 1 to 3 breaks muscle processing method, it is characterized in that, in described step 4, when needing bending described new prestress wire because of stretch-draw, described prestress wire is respectively all not less than 6.5m to the radius of curvature of skew.
6. the un-bonded prestressed steel strand in pre-stress construction as claimed in claim 3 breaks muscle processing method, and it is characterized in that, the length of described rectangular channel is 30cm, and width is 15cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510351638.4A CN105019662A (en) | 2015-06-23 | 2015-06-23 | Rebar-breaking treatment method of unbonded pre-stressed steel stranded wires for pre-stressed construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510351638.4A CN105019662A (en) | 2015-06-23 | 2015-06-23 | Rebar-breaking treatment method of unbonded pre-stressed steel stranded wires for pre-stressed construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105019662A true CN105019662A (en) | 2015-11-04 |
Family
ID=54409928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510351638.4A Pending CN105019662A (en) | 2015-06-23 | 2015-06-23 | Rebar-breaking treatment method of unbonded pre-stressed steel stranded wires for pre-stressed construction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105019662A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740161A (en) * | 2021-09-09 | 2021-12-03 | 交通运输部公路科学研究所 | Effective prestress detection method for pre-tensioned prestressed concrete hollow slab steel strand |
| CN114457871A (en) * | 2022-03-08 | 2022-05-10 | 扬州大学 | Prestressing force structure suitable for piece base type pump station business turn over water flow path accuse splits |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5332394A (en) * | 1976-09-06 | 1978-03-27 | Fujikura Ltd | Total tension steel stranded wire burden type aerial transmission wire and its formulating |
| CN1075437A (en) * | 1992-02-07 | 1993-08-25 | 阿迈隆有限公司 | The jockey of prestress rope and method |
| CN101063374A (en) * | 2007-05-23 | 2007-10-31 | 浙江省二建建设集团有限公司 | Construction technique for rebuilding prestressing force system after built prestressing force system destroyed in reinforced concrete structure |
| CN101158238A (en) * | 2007-11-21 | 2008-04-09 | 王用中 | Broken-line reinforcement prestressed concrete pre-tensioned girder construction process |
| CN101748898A (en) * | 2010-01-21 | 2010-06-23 | 武汉二航路桥特种工程有限责任公司 | Method for implementing the middle connection tensioning of cables and device thereof |
| CN201679149U (en) * | 2010-01-21 | 2010-12-22 | 武汉二航路桥特种工程有限责任公司 | Device for middle connection and tension of steel stands |
| CN201972415U (en) * | 2010-08-09 | 2011-09-14 | 浙江省二建建设集团有限公司 | Exchange device of a strained and broken prestressing steel strand without bond |
-
2015
- 2015-06-23 CN CN201510351638.4A patent/CN105019662A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5332394A (en) * | 1976-09-06 | 1978-03-27 | Fujikura Ltd | Total tension steel stranded wire burden type aerial transmission wire and its formulating |
| CN1075437A (en) * | 1992-02-07 | 1993-08-25 | 阿迈隆有限公司 | The jockey of prestress rope and method |
| CN101063374A (en) * | 2007-05-23 | 2007-10-31 | 浙江省二建建设集团有限公司 | Construction technique for rebuilding prestressing force system after built prestressing force system destroyed in reinforced concrete structure |
| CN101158238A (en) * | 2007-11-21 | 2008-04-09 | 王用中 | Broken-line reinforcement prestressed concrete pre-tensioned girder construction process |
| CN101748898A (en) * | 2010-01-21 | 2010-06-23 | 武汉二航路桥特种工程有限责任公司 | Method for implementing the middle connection tensioning of cables and device thereof |
| CN201679149U (en) * | 2010-01-21 | 2010-12-22 | 武汉二航路桥特种工程有限责任公司 | Device for middle connection and tension of steel stands |
| CN201972415U (en) * | 2010-08-09 | 2011-09-14 | 浙江省二建建设集团有限公司 | Exchange device of a strained and broken prestressing steel strand without bond |
Non-Patent Citations (1)
| Title |
|---|
| 杨晓燕 等: "无粘结预应力筋的防护与修复", 《徐州工程学院学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740161A (en) * | 2021-09-09 | 2021-12-03 | 交通运输部公路科学研究所 | Effective prestress detection method for pre-tensioned prestressed concrete hollow slab steel strand |
| CN114457871A (en) * | 2022-03-08 | 2022-05-10 | 扬州大学 | Prestressing force structure suitable for piece base type pump station business turn over water flow path accuse splits |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10865557B2 (en) | Prestressed assembled concrete frame-joint connecting structure and constructing method thereof | |
| AU2020100507A4 (en) | Prefabricated Concrete Frame Beam-Column Connection Joint With Steel Strands Anchored | |
| US8375676B2 (en) | Half precast slab and method for structuring half precast slab | |
| EP3290610A1 (en) | Constructive system and method of erecting such a constructive system | |
| CN102979221A (en) | Shear wall structure configured with crossed slant internal prestress and construction method of shear wall structure | |
| KR100988074B1 (en) | Girder bridge connected to abutment and the construction method thereof | |
| KR101260863B1 (en) | Rhamen bridge having prestressed concrete girder of arch-shaped and construction method thereof | |
| CN102409619A (en) | Method for improving transverse integrity of bridge deck structure of multi-beam type combined small box girder bridge | |
| JP2017115485A (en) | Road bridge guard fence and installation method thereof | |
| KR101075756B1 (en) | A manufacturing process for the Truss Half Precast Prestressed Concrete Panel | |
| CN104929279B (en) | Pre-cast shear wall vertical rebar centralized restraint lap joint construction | |
| CN107795012B (en) | Active constraint type cast-in-situ frame beam column node system based on slow bonding prestress technology | |
| CN108951418B (en) | Hinge joint structure of prefabricated hollow slab beam and construction method thereof | |
| CN105019662A (en) | Rebar-breaking treatment method of unbonded pre-stressed steel stranded wires for pre-stressed construction | |
| JP6811678B2 (en) | Method of joining concrete structures and concrete members to which continuous fiber reinforced concrete is applied | |
| KR200407182Y1 (en) | Precasted concrete plate | |
| KR101339367B1 (en) | Fabrication and reinforcing method for pre-flex girder | |
| KR101397131B1 (en) | Prestress concrete bridge and building method thereof | |
| JP2010037833A (en) | Bridge extrusion erection construction method | |
| KR101350797B1 (en) | a precast slab with a pc strand holding apparatus, and the construction method thereof | |
| CN108678248A (en) | A kind of modular unit transverse connection structure and its construction technology | |
| JP2020063598A (en) | Hinge part reinforcement method and reinforcement structure in hinged girder bridge with pc | |
| KR200436478Y1 (en) | Continuous prestressed concrete structure without baseplate concrete | |
| CN108677716A (en) | A kind of group's nail attachment device with corrugated sleeve | |
| CN109881777B (en) | Assembled high-toughness cement-based composite material beam column joint |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151104 |
|
| WD01 | Invention patent application deemed withdrawn after publication |