CN113802773B - 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
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- CN113802773B CN113802773B CN202111069697.4A CN202111069697A CN113802773B CN 113802773 B CN113802773 B CN 113802773B CN 202111069697 A CN202111069697 A CN 202111069697A CN 113802773 B CN113802773 B CN 113802773B
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- prestressed
- concrete
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- reinforcement
- tendon
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
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 steel bar penetrating process, the prestressed steel bar processed by the steel strand has certain flexibility, the angle of the end part of the prestressed steel bar is easy to change in the steel bar penetrating process to a preset position, and particularly in a large-span plate component, so that the position of the end part of the prestressed steel bar is often required to be adjusted manually during installation and laying of the prestressed steel bar, the position of the prestressed steel bar is kept correct, and the construction efficiency of the conventional slow bonding construction process is lower.
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 bar penetrating 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 obtained by a person skilled in the art without inventive efforts based on the embodiments of the present invention, shall fall within the scope of protection 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) Clamping a lower connecting ring 6 in a fixing device 5 on a common steel bar, then rotating an adjusting sleeve 7 to clamp an upper connecting ring 8 (the upper connecting ring 8 is spirally connected to the adjusting sleeve 7, and the upper end of the lower connecting ring 6 is embedded on the adjusting sleeve 7, so that the upper connecting ring 8 can be extended/retracted when the adjusting sleeve 7 is rotated) in the fixing device 5 on a prestressed bar, rotating the adjusting sleeve 7 and jacking the prestressed bar among all the fixing sleeves 2 to a designed height (the thickness of a steel bar or a prestressed reinforced concrete protective layer in a concrete member needs to be accurate, and the fixing device 5 can adjust the position of the prestressed bar according to the thickness of the protective layer required by design, thereby ensuring that the position of the prestressed bar 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 fixing a hole mold or foam, a spiral bar and a pressure bearing plate on the common steel bar by using binding wires;
5) Pouring concrete;
6) After the strength of the concrete reaches 85% of the design strength, removing the hole molds, cleaning Zhang Lakong, calibrating prestress tensioning equipment, and then installing an anchorage device at a tensioning end for tensioning;
7) Cutting off redundant prestressed tendons after tensioning is finished, performing anticorrosion treatment on the anchorage device, removing loose concrete and floating sand in Zhang Lacao, then washing the concrete and floating sand completely with water, removing redundant water in Zhang Lacao, 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 with 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 15mm.
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 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 tensioning end of the prestressed tendon on the common steel bar by using a binding wire;
4) Clamping a lower connecting ring in a fixing device on a common steel bar, then rotating an adjusting sleeve to clamp an upper connecting ring in the fixing device on a prestressed tendon, rotating the adjusting sleeve and jacking the prestressed tendon among all the fixing sleeves to a designed height, and then fixing a hole die or foam, a spiral tendon and a pressure-bearing plate on the common steel bar by using a binding wire;
5) Pouring concrete;
6) After the strength of the concrete reaches 85% of the design strength, removing the hole molds, cleaning Zhang Lakong, calibrating prestress tensioning equipment, and then installing an anchorage device at a tensioning end for tensioning;
7) Cutting off redundant prestressed tendons after tensioning is finished, performing anticorrosion treatment on the anchorage device, removing loose concrete and floating sand in Zhang Lacao, then washing the concrete and floating sand completely with water, removing redundant water in Zhang Lacao, 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 with a polishing machine;
the upper connecting ring is spirally connected to the adjusting sleeve, and the upper end of the lower connecting ring is embedded in the adjusting sleeve.
2. The construction method according to claim 1, wherein when the prestressed reinforcement is laid in the step 1), positioning points are drawn in advance according to drawings and design requirements, then 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 prestressed tendon is required to horizontally deflect by no more than 50mm and vertically deflect by no 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 CN113802773A (en) | 2021-12-17 |
| CN113802773B true CN113802773B (en) | 2023-04-14 |
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| CN202111069697.4A Active CN113802773B (en) | 2021-09-13 | 2021-09-13 | Construction method of large-diameter slow-bonding prestressed tendon in large-span member |
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Family Cites Families (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 |
| JP3762717B2 (en) * | 2002-04-30 | 2006-04-05 | 住友電工スチールワイヤー株式会社 | PC steel fixed structure |
| CN2799743Y (en) * | 2005-06-21 | 2006-07-26 | 杨清晨 | Cast-in-place concrete precise regulator and controller |
| CN101289890B (en) * | 2008-05-27 | 2010-08-11 | 东南大学 | Steel stranded line rapid traction joint |
| CN102852092B (en) * | 2012-10-10 | 2015-07-15 | 中铁上海工程局集团有限公司 | 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 |
| US9638353B2 (en) * | 2014-11-03 | 2017-05-02 | A.L. Patterson, Inc. | Clip for supporting a prestressed cable along a dovetail slot in a cement casting |
| 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 |
| CN112411884B (en) * | 2020-10-10 | 2021-09-24 | 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 |
| CN112832512B (en) * | 2021-01-07 | 2022-05-27 | 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 |
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| CN113802773A (en) | 2021-12-17 |
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