CN112922349A - Post-tensioning unbonded prestressed reinforcement beam upper tensioning construction method - Google Patents
Post-tensioning unbonded prestressed reinforcement beam upper tensioning construction method Download PDFInfo
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- CN112922349A CN112922349A CN202110068864.7A CN202110068864A CN112922349A CN 112922349 A CN112922349 A CN 112922349A CN 202110068864 A CN202110068864 A CN 202110068864A CN 112922349 A CN112922349 A CN 112922349A
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- 238000010276 construction Methods 0.000 title claims abstract description 46
- 230000002787 reinforcement Effects 0.000 title claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 75
- 239000010959 steel Substances 0.000 claims abstract description 75
- 238000000034 method Methods 0.000 claims description 22
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 239000004570 mortar (masonry) Substances 0.000 claims description 6
- 229910021538 borax Inorganic materials 0.000 claims description 5
- 239000004328 sodium tetraborate Substances 0.000 claims description 5
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 8
- 238000009435 building construction Methods 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 9
- 238000004873 anchoring Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 7
- 239000011513 prestressed concrete Substances 0.000 description 4
- 239000004567 concrete Substances 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 210000002435 tendon Anatomy 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
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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
- E04G21/121—Construction of stressing jacks
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention provides a post-tensioning unbonded prestressed reinforcement beam tensioning construction method, which belongs to the technical field of building construction.A prestressed steel strand is pre-embedded in a prestressed beam, and a tensioning end of the prestressed steel strand extends outwards from a tensioning groove arranged at the beam top of the prestressed beam; conveying the tensioning equipment to the prestressed beam; tensioning the tensioning end of the prestressed steel strand by using tensioning equipment; thereby achieving the technical effect of quickly and safely completing the tensioning construction.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a post-tensioning unbonded prestressed reinforcement beam tensioning construction method.
Background
The cast-in-place post-tensioned prestressed concrete structure is one of the main structures of the prestressed concrete structure. The post-tensioning unbonded prestressed concrete technology is characterized in that prestress is built for a concrete structure through procedures of pipeline pre-embedding, rib penetrating, tensioning and the like so as to meet design requirements.
In the prior art, in the implementation process of the post-tensioning unbonded prestressing technology, the tensioning end of a prestressed tendon (prestressed steel strand) is arranged under a beam. When tensioning operation is carried out, an operation platform needs to be built under a beam by using a scaffold, then a jack is conveyed to the operation platform, a guide chain is fixed on a floor slab at the upper part of a tensioning end, and the jack is fixed by the guide chain to carry out slow tensioning on the prestressed tendons; the disadvantages are as follows:
1. the tensioning process needs to be completed by multiple persons, the operation process is complicated, and the risk coefficient is high;
2. when the anchor is sealed after tensioning, a secondary template is required, the anchor sealing operation difficulty is high, and the anchor sealing quality is not easy to control.
Therefore, a post-tensioning unbonded prestressed reinforcement beam upper tensioning construction method which is safe, reliable and high in construction efficiency is needed.
Disclosure of Invention
The invention aims to provide a post-tensioning unbonded prestressed reinforcement beam tensioning construction method, which improves the tensioning construction efficiency by performing post-tensioning unbonded prestressed tensioning construction on a beam.
The invention also discloses a post-tensioning unbonded prestressed reinforcement beam tensioning construction method, which comprises the following steps:
s1, pre-burying prestressed steel strands in the prestressed beam, wherein the tensioning ends of the prestressed steel strands extend outwards from a tensioning groove arranged at the beam top of the prestressed beam; the prestressed steel strand is pre-embedded at the bottom of the prestressed beam at the midspan section of the prestressed beam; pre-burying a prestressed steel strand at the beam top of the prestressed beam at the section of the fulcrum of the prestressed beam;
s2, conveying the tensioning equipment to the prestressed beam;
and S3, tensioning the tensioning end of the prestressed steel strand by using tensioning equipment.
Further, preferably, post-cast strips are arranged in the prestressed beams, and a prestressed steel strand is arranged between every two adjacent post-cast strips.
Further, it is preferable that the step S3 further includes: and according to the arrangement sequence of the post-cast strip, carrying out tensioning operation on the tensioning ends of the pre-stressed steel strands corresponding to the post-cast strip, lapping the tensioning ends of the adjacent pre-stressed steel strands, and carrying out tensioning operation on the lapped tensioning ends.
Further, preferably, the method for performing the stretching operation on the overlapped stretching end comprises the following steps: and tensioning the tensioning ends of the prestressed steel strands which are mutually overlapped in a manner of adding armpits at two ends in the horizontal direction.
Further, preferably, the method further comprises an anchor sealing step, wherein the anchor sealing step comprises: and filling the tensioning end of the prestressed steel strand with mortar until the tail end of the tensioning end is flush with the floor slab.
Further, preferably, the fixed end of the prestressed steel strand is fixed by adopting a single steel strand anchor backing plate.
Further, preferably, the surface of the prestressed steel strand is coated with a borax coating.
As mentioned above, the tensioning construction method on the post-tensioning unbonded prestressed reinforcement beam of the invention realizes the completion of the tensioning construction on the beam by arranging the tensioning end of the prestressed steel strand on the prestressed beam, thereby achieving the technical effect of safely and quickly completing the tensioning construction; moreover, the process of sealing the anchor on the beam is simple and convenient to operate, and labor and materials are saved.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description and appended claims, taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is a scene schematic diagram of a tensioning construction method on a post-tensioning unbonded prestressed reinforcement beam according to an embodiment of the invention.
Wherein the content of the first and second substances,
1. a prestressed beam; 2. post-pouring a belt; 3. pre-stressed steel strands; 31. stretching the end; 32. and a fixed end.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
According to the post-tensioning unbonded prestressed reinforcement beam tensioning construction method, the tensioning ends of the prestressed steel strands are arranged on the prestressed beam, so that tensioning construction and anchor sealing construction are completed on the beam, and the technical effect of safely and quickly completing the tensioning construction is achieved.
Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a general description of a tension construction method on a post-tensioning unbonded prestressed reinforcement beam. Specifically, fig. 1 is a schematic view of a post-tensioning unbonded prestressed reinforcement beam tensioning construction method according to an embodiment of the present invention; as shown in figure 1 of the drawings, in which,
the invention discloses a post-tensioning unbonded prestressed reinforcement beam tensioning construction method, which comprises the following steps:
s1, pre-burying a prestressed steel strand 3 in the prestressed beam 1, wherein a tensioning groove is formed in the beam top of the prestressed beam 1, and a tensioning end 31 of the prestressed steel strand 1 extends outwards from the tensioning groove; the prestressed steel strand 3 is pre-embedded at the bottom of the prestressed beam at the midspan section of the prestressed beam 1; at the section of the fulcrum of the prestressed beam 1, the prestressed steel strand 3 is pre-embedded at the top of the prestressed beam.
It should be noted that the prestressed steel strand 3 is made of a high-carbon steel wire rod, is subjected to surface treatment and then is cold-drawn into steel wires, and then a certain number of steel wires are stranded into strands according to a steel strand structure, and is formed through a stabilization treatment process for stress relief. And ordinary prestressed steel strands are adopted for manufacturing unbonded prestressed steel strands (unbonded steel strands), and high-density polyethylene (HDPE) is coated with anticorrosive grease or paraffin.
In a specific implementation process, when the tensioning groove is arranged at the midspan section of the prestressed beam 1, the tensioning groove is arranged in a positive bending moment mode, and when the tensioning groove is arranged at the fulcrum section of the prestressed beam 1, the tensioning groove is arranged in a negative bending moment mode. The wire harness of the prestressed steel strand 3 is arranged in a curve shape, and the shape of the tension groove is adjusted, so that the tension groove is set to be in positive bending moment due to the positive bending moment effect at the midspan section position of the prestressed beam 1, and the prestressed steel strand 3 is arranged at the position, close to the beam bottom, of the prestressed beam. Because the cross section of the fulcrum of the prestressed beam 1 has a negative bending moment effect, the tensioning groove is set to be the negative bending moment, so that the prestressed steel strand 3 is arranged at the position, close to the beam top, of the prestressed beam to resist the negative bending moment effect.
During construction, pre-burying a prestressed steel strand 3 in a template of the prestressed beam 1, and arranging a tensioning end of the prestressed steel strand 3 at the position of the top of the beam end. And after the concrete reaches the specified strength, tensioning and anchoring the prestressed steel strands, and finally grouting and anchoring.
The prestressed steel strand 3 is tensioned at the upper part of the top of the beam end of the prestressed beam 1, and the prestressed steel strand 3 penetrates out of the top of the beam, so that the increase of construction steps caused by opening holes at the beam side or the beam bottom is avoided; thereby facilitating the installation of the fixed end 32 and the tensioning end 31 of the prestressed steel strand 3.
S2, conveying the tensioning equipment to the prestressed beam 1; and S3, tensioning the tensioning end of the prestressed steel strand 3 by using tensioning equipment.
The upper part of the prestressed beam 1 is tensioned, only the tensioning equipment needs to be lifted to the floor by a tower crane, workers can convey the tensioning equipment to the tensioning end 31 by a trolley, and the conveying of the jack can be realized by only three workers. No additional auxiliary equipment is needed, and no additional operating platform is needed. In the tensioning process, a portable jack is adopted to tension the steel strands one by one, and then the steel strands are fixed one by one. And finishing tensioning by constructors according to construction requirements. The tensioning construction process is simple and convenient, the tensioning quality is easy to control, and the tensioning construction operation is safer.
Specifically, the anchor sealing step includes: and filling the tensioning end of the prestressed steel strand 3 with mortar until the tail end of the tensioning end is flush with the floor slab. In the prior art, a secondary formwork needs to be erected when the prestressed beam is anchored under the beam, mortar with the same label as the prestressed beam is used for anchoring, and secondary repairing treatment needs to be carried out on the surface of the prestressed beam after anchoring is finished. And the tensioning anchor at the upper part of the beam is directly filled with mortar with the same grade as the floor slab until the tensioning anchor is level with the floor slab, and the surface layer after the anchor is sealed by the decoration surface layer is not required to be specially treated and is leveled, so that the anchor sealing process is simple and convenient, the labor cost and the material cost are saved, and the tensioning construction engineering quality is improved.
In a specific embodiment, post-cast strips are arranged in the prestressed beam 1, and a prestressed steel strand 3 is arranged between every two adjacent post-cast strips. In order to further improve the tensioning construction efficiency, the tensioning ends of the prestressed steel strands corresponding to the post-cast strip are tensioned according to the arrangement sequence of the post-cast strip, the tensioning ends of the adjacent prestressed steel strands are lapped, and the lapped tensioning ends are tensioned. The method for performing tensioning operation on the overlapped tensioning end comprises the following steps: and tensioning the tensioning ends of the prestressed steel strands which are mutually overlapped in a manner of adding armpits at two ends in the horizontal direction. Specifically, the prestressed steel strands 3 are independently arranged at the position of the post-cast strip, segmented tensioning is carried out according to division of the post-cast strip, effective lap joint is carried out, and the prestressed steel strands 3 at the positions of two sides of the post-cast strip can be tensioned and anchored in advance. The prestress steel strands 3 are separately arranged on two sides of the post-cast strip, and then segmented tensioning is carried out according to division of the post-cast strip. The complete separation of the early-stage structure construction and the post-cast strip construction can be realized. And the two ends of the horizontal direction are provided with armpits, the opposite prestressed steel strands are stretched in a crossed manner, namely, the triangle of the armpits is in the horizontal plane, namely, the armpits can be seen from the top view or the bottom view. The tensioning end is tensioned in a mode that two ends of the tensioning end are haunched in the horizontal direction, prestress is further improved, and tensioning construction efficiency is improved.
In a specific embodiment, the fixed end 32 of the prestressed steel strand 3 is fixed by a single strand anchor pad. In a specific implementation process, when the fixed end of a certain node is dense, the fixed end is fixed in a single steel strand anchor backing plate mode. The strength of the anchor backing plate must meet the requirement of compressive stress during prestress tensioning construction. In the post-tensioned structure, in the prestressed concrete, an appropriate anchoring device corresponding to the prestressed steel strand 3 is used in order to maintain the prestress and transmit the tensile force of the steel strand into the concrete. In the construction process, the anchorage device at the top end of the prestressed steel strand degree is assembled with the bearing plate and the spiral rib, the anchor backing plate is arranged between the embedded pipe and the anchoring device, and the prestressed steel strand penetrates through the embedded pipe and is fixed through the anchoring device.
In a particular embodiment, the surface of the prestressed steel strands 3 is coated with a borax coating. In a specific implementation process, the surface of the prestressed steel strand 3 is covered with a lubricating coating, and the lubricating coating can comprise any one of a lime coating, a borax coating, a water glass coating, a phosphate coating and a yellowing coating. The lubricating coating of the prestressed steel strand is selected as the borax coating, so that the technical effects of further improving the mechanical properties of the drawn steel wire and reducing the consumption of the die can be achieved.
In conclusion, the invention relates to a post-tensioning unbonded prestressed reinforcement beam upper tensioning construction method, which adopts a beam upper tensioning mode, has simple and convenient tensioning process, easily controlled tensioning quality and higher safety; the upper part of the beam is tensioned and anchored and is directly filled with mortar with the same grade as the floor slab until the upper part of the beam is level with the floor slab. The anchor sealing process is simple and convenient, labor cost and material cost are saved, and the tensioning construction engineering quality is improved.
The post-tensioning unbonded prestressed reinforcement beam up-tensioning construction method meets the national existing technical standard, and achieves the technical effects of reducing construction procedures, lowering construction cost and reducing potential safety hazards.
However, it will be appreciated by those skilled in the art that various modifications may be made to the post-tensioning unbonded prestressed reinforcement beam tensioning method provided by the present invention without departing from the scope of the present invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (7)
1. A post-tensioning unbonded prestressed reinforcement beam tensioning construction method is characterized by comprising the following steps:
s1, pre-burying a prestressed steel strand in the prestressed beam, wherein the tensioning end of the prestressed steel strand extends outwards from a tensioning groove arranged at the beam top of the prestressed beam; the prestressed steel strand is pre-buried at the bottom of the prestressed beam at the midspan section of the prestressed beam; the prestressed steel strand is pre-embedded at the beam top of the prestressed beam at the section of the fulcrum of the prestressed beam;
s2, conveying a tensioning device to the prestressed beam;
and S3, tensioning the tensioning end of the prestressed steel strand by using the tensioning equipment.
2. The post-tensioning unbonded prestressed reinforcement beam tensioning construction method according to claim 1,
post-cast strips are arranged in the prestressed beams, and a prestressed steel strand is arranged between every two adjacent post-cast strips.
3. The post-tensioning unbonded prestressed reinforcement beam tensioning construction method as claimed in claim 2, wherein the step S3 further comprises:
and according to the arrangement sequence of the post-cast strip, carrying out tensioning operation on the tensioning ends of the pre-stressed steel strands corresponding to the post-cast strip, overlapping the tensioning ends of the adjacent pre-stressed steel strands, and carrying out tensioning operation on the overlapped tensioning ends.
4. The method for tensioning construction on a post-tensioning unbonded prestressed reinforcement beam as claimed in claim 3, wherein the method for tensioning the overlapped tensioning ends comprises:
and tensioning the tensioning ends of the prestressed steel strands which are mutually overlapped in a manner of adding armpits at two ends in the horizontal direction.
5. The post-tensioning unbonded prestressed reinforcement beam tensioning construction method according to claim 1,
an anchor blocking step is further included after the step S3, and the anchor blocking step includes:
and filling the tensioning end of the prestressed steel strand by using mortar until the tail end of the tensioning end is flush with the floor slab.
6. The post-tensioning unbonded prestressed reinforcement beam tensioning construction method according to claim 1,
and the fixed end of the prestressed steel strand is fixed by adopting a single steel strand anchor backing plate mode.
7. The post-tensioning unbonded prestressed reinforcement beam tensioning construction method according to claim 6, characterized in that,
and the surface of the prestressed steel strand is covered with a borax coating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110068864.7A CN112922349A (en) | 2021-01-19 | 2021-01-19 | Post-tensioning unbonded prestressed reinforcement beam upper tensioning construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110068864.7A CN112922349A (en) | 2021-01-19 | 2021-01-19 | Post-tensioning unbonded prestressed reinforcement beam upper tensioning construction method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101016790A (en) * | 2007-02-06 | 2007-08-15 | 同济大学 | Large span prestressed beam using bonded and non-bonded hybrid reinforcement design method |
| CN103790385A (en) * | 2014-02-26 | 2014-05-14 | 中国建筑第八工程局有限公司 | Construction method for tensioning prestressed structure |
| CN107299711A (en) * | 2017-08-08 | 2017-10-27 | 浙江华展工程研究设计院有限公司 | The late poured band structure of prestressed concrete panel |
| CN108708498A (en) * | 2018-07-09 | 2018-10-26 | 上海建工集团股份有限公司 | A kind of external prestressing strengthening concrete frame beam structure and its construction method |
| CN210032336U (en) * | 2019-04-09 | 2020-02-07 | 中铁四局集团建筑工程有限公司 | Slow-bonding prestressed tendon beam jacking tensioning assembly |
-
2021
- 2021-01-19 CN CN202110068864.7A patent/CN112922349A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101016790A (en) * | 2007-02-06 | 2007-08-15 | 同济大学 | Large span prestressed beam using bonded and non-bonded hybrid reinforcement design method |
| CN103790385A (en) * | 2014-02-26 | 2014-05-14 | 中国建筑第八工程局有限公司 | Construction method for tensioning prestressed structure |
| CN107299711A (en) * | 2017-08-08 | 2017-10-27 | 浙江华展工程研究设计院有限公司 | The late poured band structure of prestressed concrete panel |
| CN108708498A (en) * | 2018-07-09 | 2018-10-26 | 上海建工集团股份有限公司 | A kind of external prestressing strengthening concrete frame beam structure and its construction method |
| CN210032336U (en) * | 2019-04-09 | 2020-02-07 | 中铁四局集团建筑工程有限公司 | Slow-bonding prestressed tendon beam jacking tensioning assembly |
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