CN113802773A - Construction method of large-diameter slow-bonding prestressed tendon in large-span member - Google Patents
Construction method of large-diameter slow-bonding prestressed tendon in large-span member Download PDFInfo
- Publication number
- CN113802773A CN113802773A CN202111069697.4A CN202111069697A CN113802773A CN 113802773 A CN113802773 A CN 113802773A CN 202111069697 A CN202111069697 A CN 202111069697A CN 113802773 A CN113802773 A CN 113802773A
- Authority
- CN
- China
- Prior art keywords
- prestressed
- concrete
- fixing
- tensioning
- bar
- 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.)
- Granted
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/162—Connectors or means for connecting parts for reinforcements
- E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
- E04C5/165—Coaxial connection by means of sleeves
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention relates to a construction method of a large-diameter slow-bonding prestressed tendon in a large-span component. According to the invention, the fixed sleeve and the bar penetrating rod are matched with the bar penetrating mode, so that the correct position of the prestressed bar is ensured, and the bar penetrating construction efficiency is higher. In the invention, the prestressed tendon is restrained by the fixed sleeve so as to ensure that the prestressed tendon is firmly positioned in the construction of the subsequent steps.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction method of a large-diameter slow-bonding prestressed tendon in a large-span member.
Background
As a new post-tensioning process, the principle of the slow bonding construction process is that pre-assembled slow bonding prestressed bars (namely steel strand bundles, wherein the strand bundles are coated with a slow-setting adhesive, and the steel strand bundles are wrapped by a corrosion-resistant protective layer) and the non-adhesion property of concrete are utilized to lay the pre-assembled slow bonding prestressed bars in a template together with the non-prestressed bars according to the designed positions, then the concrete is poured, and after the concrete reaches the strength required by the design, the tension and anchor sealing are carried out by utilizing the longitudinal sliding property of the slow bonding prestressed bars in the structure, so that the anchor applies external pressure to the concrete under the action of the internal pressure stress of the prestressed bars, thereby improving the structural performance, prolonging the service life of the structure and reducing the temperature deformation and crack resistance of the whole structure.
When the on-site reinforcing mesh binding operation is carried out in the slow bonding construction process, the HRB type conventional reinforcing mesh is usually bound and formed (the section height of the reinforcing mesh is usually 16-30cm, namely the distance between the thickness of a member plate and a reinforcing protective layer), and then the installation and the laying of the prestressed tendons are started. Different from the conventional steel bar with high rigidity and small deformation in the bar penetrating process, the prestressed bar processed by the steel strand has certain flexibility, the angle of the end part of the prestressed bar is easy to change in the bar penetrating process to a preset position, particularly in a large-span plate member, so that the position of the end part of the prestressed bar is often required to be adjusted manually in the installation and laying of the prestressed bar, the position of the prestressed bar is kept correct, and the construction efficiency of the conventional slow bonding construction process is low.
Disclosure of Invention
Aiming at the problems, the construction method of the large-diameter slow-bonding prestressed tendon in the large-span member is provided, and aims to effectively solve the problems of the prior art.
The invention has the beneficial effects that:
1) according to the invention, the fixed sleeve and the bar penetrating rod are matched with the bar penetrating mode, so that the correct position of the prestressed bar is ensured, and the bar penetrating construction efficiency is higher.
Drawings
Fig. 1 is a schematic structural view of a tendon-threading assisting device provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a fixing device provided in an embodiment of the present invention.
In the drawings: 1. a reinforcement penetration auxiliary device; 2. fixing the sleeve; 3. a bar penetrating rod; 4. a spring marble; 5. a fixing device; 6. a lower connecting ring; 7. an adjustment sleeve; 8. an upper connecting ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
As shown in fig. 1 and 2, a construction method provided in an embodiment of the present invention includes the steps of:
1) binding common steel bars after supporting the beam or the plate bottom mold;
2) spot welding the fixed sleeves 2 in the tendon-penetrating auxiliary device 1 on the common steel bars at intervals at the prestressed tendon laying position according to a design drawing, then penetrating and fixing one end of each prestressed tendon on a tendon-penetrating rod 3, spot-welding spring marbles 4 on the tendon-penetrating rod, and then sequentially penetrating and fixing the tendon-penetrating rods in the fixed sleeves 2 by the spring marbles 4 according to the design drawing so as to finish the laying of the prestressed tendons according to the design drawing;
3) pressing the spring marble 4 to release the bar penetrating rod 3, then taking down the bar penetrating rod 3, and fixing the tensioning end of the prestressed bar on the common steel bar by using a binding wire;
4) the lower connecting ring 6 in the fixing device 5 is clamped on the common steel bar, then the adjusting sleeve 7 is rotated to clamp the upper connecting ring 8 (the upper connecting ring 8 is spirally connected on the adjusting sleeve 7, the upper end of the lower connecting ring 6 is embedded on the adjusting sleeve 7, so the upper connecting ring 8 can be extended/retracted when the adjusting sleeve 7 is rotated) in the fixing device 5 on the prestressed tendons, the adjusting sleeve 7 is rotated to lift the prestressed tendons among the fixing sleeves 2 to the designed height (the thickness of the steel bar or the prestressed reinforced concrete protective layer in the concrete member needs to be accurate, the fixing device 5 can adjust the position of the prestressed tendons according to the protective layer thickness required by the design, thereby ensuring that the position of the prestressed tendons does not change in the concrete pouring process of the protective layer and further ensuring the thickness of the protective layer to be accurate), and then a hole die or a foam die are clamped by using binding wires, The spiral rib and the bearing plate are fixed on the common steel bar;
5) pouring concrete;
6) after the strength of the concrete reaches 85% of the design strength, removing the hole molds, cleaning the tensioning holes, calibrating the prestress tensioning equipment, and then installing an anchorage device at the tensioning end for tensioning;
7) cutting off redundant prestressed tendons after tensioning is finished, performing anti-corrosion treatment on the anchorage device, removing loose concrete and floating sand in the tensioning groove, then washing the concrete with water, removing redundant water in the tensioning groove, filling and plugging the tensioning groove with fine stone concrete with the same strength grade as the structure or fine stone concrete with a high grade, and finally polishing and flattening the concrete which exceeds the concrete surface of the original structure during plugging by using a polishing machine.
According to the invention, the fixed sleeve and the bar penetrating rod are matched with the bar penetrating mode, so that the correct position of the prestressed bar is ensured, and the bar penetrating construction efficiency is higher.
In the invention, the prestressed tendon is restrained by the fixed sleeve 2 so as to ensure the position of the prestressed tendon to be firm in the subsequent step of construction.
It should be noted that when the prestressed reinforcement is laid in the step 1), positioning points are drawn in advance according to a drawing and design requirements, then positioning devices are installed in advance, and then the prestressed steel strands which are well blanked are laid uniformly according to the positioning points; and (3) when the prestressed tendons are penetrated in the step 1), the horizontal deflection of the prestressed tendons is required to be not more than 50mm, and the vertical deviation is not more than 15 mm.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (3)
1. A construction method of a large-diameter slow-bonding prestressed tendon in a large-span member is characterized by comprising the following steps:
1) binding common steel bars after supporting the beam or the plate bottom mold;
2) spot welding fixing sleeves in the reinforcement penetrating auxiliary device on common steel bars at intervals at the position where the prestressed reinforcement is laid according to a design drawing, then penetrating and fixing one end of the prestressed reinforcement on a reinforcement penetrating rod, spot welding spring marbles on the reinforcement penetrating rod, and then sequentially penetrating and fixing the reinforcement penetrating rod in each fixing sleeve by using the spring marbles according to the design drawing so as to finish the laying of the prestressed reinforcement;
3) pressing the spring marble to release the bar penetrating rod, then taking down the bar penetrating rod, and fixing the stretching end of the prestressed bar on the common steel bar by using a binding wire;
4) clamping a lower connecting ring in the fixing device on a common steel bar, then rotating the adjusting sleeve to clamp an upper connecting ring in the fixing device on the prestressed tendons, rotating the adjusting sleeve and jacking the prestressed tendons among the fixing sleeves to a designed height, and then fixing the hole die or the foam, the spiral tendons and the bearing plate on the common steel bar by using the binding wires;
5) pouring concrete;
6) after the strength of the concrete reaches 85% of the design strength, removing the hole molds, cleaning the tensioning holes, calibrating the prestress tensioning equipment, and then installing an anchorage device at the tensioning end for tensioning;
7) cutting off redundant prestressed tendons after tensioning is finished, performing anti-corrosion treatment on the anchorage device, removing loose concrete and floating sand in the tensioning groove, then washing the concrete with water, removing redundant water in the tensioning groove, filling and plugging the tensioning groove with fine stone concrete with the same strength grade as the structure or fine stone concrete with a high grade, and finally polishing and flattening the concrete which exceeds the concrete surface of the original structure during plugging by using a polishing machine.
2. The construction method according to claim 1, wherein during the laying of the prestressed tendons in the step 1), positioning points are drawn in advance according to drawing and design requirements, positioning devices are installed in advance, and then the blanked prestressed steel strands are uniformly laid according to the positioning points.
3. The construction method according to claim 1, wherein the horizontal deflection of the prestressed tendon is not more than 50mm and the vertical deflection is not more than 15mm when the prestressed tendon is penetrated in the step 1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111069697.4A CN113802773B (en) | 2021-09-13 | 2021-09-13 | Construction method of large-diameter slow-bonding prestressed tendon in large-span member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111069697.4A CN113802773B (en) | 2021-09-13 | 2021-09-13 | Construction method of large-diameter slow-bonding prestressed tendon in large-span member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113802773A true CN113802773A (en) | 2021-12-17 |
| CN113802773B CN113802773B (en) | 2023-04-14 |
Family
ID=78940998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111069697.4A Active CN113802773B (en) | 2021-09-13 | 2021-09-13 | Construction method of large-diameter slow-bonding prestressed tendon in large-span member |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113802773B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0592342U (en) * | 1992-05-21 | 1993-12-17 | 大成建設株式会社 | PC strand guide cap |
| JP2003321935A (en) * | 2002-04-30 | 2003-11-14 | Sumitomo Denko Steel Wire Kk | Fixing structure of pc steel member |
| CN2799743Y (en) * | 2005-06-21 | 2006-07-26 | 杨清晨 | Cast-in-place concrete precise regulator and controller |
| CN101289890A (en) * | 2008-05-27 | 2008-10-22 | 东南大学 | Steel stranded line rapid traction joint |
| CN102852092A (en) * | 2012-10-10 | 2013-01-02 | 中铁上海工程局有限公司 | Hanging cable guiding device and method |
| CN203403362U (en) * | 2013-06-14 | 2014-01-22 | 中交二航局第四工程有限公司安徽分公司 | Pretensioned prestressed pedestal |
| CN204252399U (en) * | 2014-12-01 | 2015-04-08 | 中石化胜利建设工程有限公司 | The fastening devices of posttension soap-free emulsion polymeization, retarded adhesive prestressed steel bar sleeve pipe |
| US20160123501A1 (en) * | 2014-11-03 | 2016-05-05 | Sidney E. Francies, III | Dovetail cable clip |
| CN207130972U (en) * | 2017-07-07 | 2018-03-23 | 中冶建工集团有限公司 | The cushion block of concrete bar protective layer poured applied to concrete wall column |
| CN210104728U (en) * | 2019-03-15 | 2020-02-21 | 江苏泰林建设有限公司 | Can splice formula tubular pile skeleton |
| CN112411884A (en) * | 2020-10-10 | 2021-02-26 | 陕西建工第九建设集团有限公司 | Fixing device for slow-bonding prestressed tendon |
| CN112832512A (en) * | 2021-01-07 | 2021-05-25 | 中铁三局集团建筑安装工程有限公司 | Large-span slow-bonding prestressed reinforced concrete beam and construction method |
| CN213683254U (en) * | 2020-10-23 | 2021-07-13 | 陕西建工第九建设集团有限公司 | Tendon distributing device for slow-bonding prestressed tendons |
-
2021
- 2021-09-13 CN CN202111069697.4A patent/CN113802773B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0592342U (en) * | 1992-05-21 | 1993-12-17 | 大成建設株式会社 | PC strand guide cap |
| JP2003321935A (en) * | 2002-04-30 | 2003-11-14 | Sumitomo Denko Steel Wire Kk | Fixing structure of pc steel member |
| CN2799743Y (en) * | 2005-06-21 | 2006-07-26 | 杨清晨 | Cast-in-place concrete precise regulator and controller |
| CN101289890A (en) * | 2008-05-27 | 2008-10-22 | 东南大学 | Steel stranded line rapid traction joint |
| CN102852092A (en) * | 2012-10-10 | 2013-01-02 | 中铁上海工程局有限公司 | Hanging cable guiding device and method |
| CN203403362U (en) * | 2013-06-14 | 2014-01-22 | 中交二航局第四工程有限公司安徽分公司 | Pretensioned prestressed pedestal |
| US20160123501A1 (en) * | 2014-11-03 | 2016-05-05 | Sidney E. Francies, III | Dovetail cable clip |
| CN204252399U (en) * | 2014-12-01 | 2015-04-08 | 中石化胜利建设工程有限公司 | The fastening devices of posttension soap-free emulsion polymeization, retarded adhesive prestressed steel bar sleeve pipe |
| CN207130972U (en) * | 2017-07-07 | 2018-03-23 | 中冶建工集团有限公司 | The cushion block of concrete bar protective layer poured applied to concrete wall column |
| CN210104728U (en) * | 2019-03-15 | 2020-02-21 | 江苏泰林建设有限公司 | Can splice formula tubular pile skeleton |
| CN112411884A (en) * | 2020-10-10 | 2021-02-26 | 陕西建工第九建设集团有限公司 | Fixing device for slow-bonding prestressed tendon |
| CN213683254U (en) * | 2020-10-23 | 2021-07-13 | 陕西建工第九建设集团有限公司 | Tendon distributing device for slow-bonding prestressed tendons |
| CN112832512A (en) * | 2021-01-07 | 2021-05-25 | 中铁三局集团建筑安装工程有限公司 | Large-span slow-bonding prestressed reinforced concrete beam and construction method |
Non-Patent Citations (2)
| Title |
|---|
| 孔德强: "缓粘结预应力施工技术要点探析", 《施工技术与测量技术》 * |
| 许育标: "后张法有黏结与无黏结预应力混凝土施工比较", 《中国市政工程》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113802773B (en) | 2023-04-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10640977B2 (en) | Concrete structure using reinforcing panel including embedded reinforcing grid and method of repairing and reinforcing the same | |
| CN110847044B (en) | Semi-prefabricated assembled bent cap construction method | |
| CN110206143B (en) | Construction method of post-tensioning prestressed assembly concrete frame structure | |
| CN112832512B (en) | Large-span slow-bonding prestressed reinforced concrete beam and construction method | |
| CN211396286U (en) | Unbonded prestressed steel strand positioning bracket | |
| CN211312247U (en) | Prestressed steel strand reinforcing device additionally arranged in hollow plate hinge joint space | |
| CN102808414A (en) | Bonded post-tensioned prestressed anchoring construction method for cast-in-place concrete structure | |
| CN215888972U (en) | Large-span slow-bonding prestressed beam | |
| CN111705664A (en) | Hoisting process of prefabricated pier stud of assembled bridge | |
| CN108858740B (en) | Construction method of hogging moment tensioning groove of precast beam | |
| CN113802773B (en) | Construction method of large-diameter slow-bonding prestressed tendon in large-span member | |
| CN110107019B (en) | Composite prefabricated floor slab for prefabricated building | |
| CN113530294A (en) | Method for assembling prefabricated member reinforcing column by adopting concrete | |
| CN105256931A (en) | Method for controlling cracks of cast-in-situ reinforced concrete plates | |
| KR102293286B1 (en) | Dual reinforcing bar web manufacturing apparatus and dual reinforcing bar web manufactured thereby | |
| CN109914800B (en) | Accurate pre-installation structure and construction method for civil building line-connecting and line-arranging pipes | |
| CN220768569U (en) | Large building roof prestress structure | |
| CN112942842A (en) | Tensioning method for prestressed reinforcement of corner beam | |
| CN111305435A (en) | One-way stress post-tensioning type connecting method for connecting prefabricated column joints | |
| CN201771083U (en) | Positioning and anti-floating device of cast-in-situ reinforced concrete floor system inner mould | |
| CN105386555A (en) | Anti-crack construction method for pre-buried pipeline part in concrete floor slab and anti-crack structure adopted | |
| CN217734128U (en) | Prestressed anchor rod combined by prestressed steel strands and steel bars | |
| CN213268016U (en) | Prestressed anti-corrosion anti-floating anchor rod | |
| CN217780474U (en) | Large-scale prefabricated case roof beam hoist and mount crack control device | |
| CN216864796U (en) | Prefabricated bridge support base stone |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |