CN101701497B - Method for strengthening concrete column by pre-stressed fiber cloth - Google Patents
Method for strengthening concrete column by pre-stressed fiber cloth Download PDFInfo
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- CN101701497B CN101701497B CN2009101912085A CN200910191208A CN101701497B CN 101701497 B CN101701497 B CN 101701497B CN 2009101912085 A CN2009101912085 A CN 2009101912085A CN 200910191208 A CN200910191208 A CN 200910191208A CN 101701497 B CN101701497 B CN 101701497B
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Abstract
The invention discloses a method for strengthening a concrete column by pre-stressed fiber cloth, using a tensioning device with a connecting-rod structure, which is capable of rapidly carrying out tensioning movement, and having the advantages of simple and convenient operation and high work efficiency. More particularly, the fiber cloth can obtain high enough tension and correspondingly, the concrete column can obtain high enough radial compressive pre-stress by applying smaller transverse tension, thereby achieving the purposes of strengthening the concrete column and preventing surface longitudinal cracks from being generated and expanded and reducing the requirements for the tensioning device and process. The tensioning device of the invention has the advantages that the stress of the fiber cloth is uniform and the tensioning effect is good during the tensioning process, and the damage of the tensioning operation to the original concrete structure is low; and the invention can greatly save the construction cost, reduce the construction risk and reduce the construction period. Therefore, the invention is of significant benefits to technology and economics in an overall manner.
Description
Technical field
The invention belongs to the structural engineering field, particularly a kind of method of strengthening concrete column by pre-stressed fiber cloth.
Background technology
When concrete column produces longitudinal crack owing to external influences such as supporting capacity deficiency or thermal stresseses, can paste cloth at its hoop and reinforce, the development with the constraint longitudinal crack improves its supporting capacity and application life.
Cloth (particularly carbon fiber) is owing to have excellent physics characteristic and good cementability, durability and corrosion resistance, and have advantages such as intensity is higher, volume is little, in light weight, being used widely aspect the reinforced concrete tension surface, more have superiority than other structural strengthening concrete structures.
In the prior art, for bringing into play its high-intensity advantage, usually carbon cloth is sticked on surface of concrete structure again applying under the prestressing force condition, can effectively improve the utilization rate of cloth, the generation and the development of restriction concrete member external crack better simultaneously is beneficial to the supporting capacity that improves member and increases the service life.Carbon cloth is applied prestressed job practices generally adopt,, reach the purpose of stretch-draw cloth by vertically applying pulling force at the cloth two ends along the vertical tension technology of cloth.The construction equipment structure of the vertical tension technology of cloth and construction technology are too complicated, improve difficulty of construction, reduce operating efficiency, and difficulty need to obtain bigger stretching force.Existing anchorage style causes loss of prestress easily simultaneously, and anchoring effect is poor.
Therefore, the method that needs a kind of strengthening concrete column by pre-stressed fiber cloth, employed device structure is simply light, high efficiency, simple to operate easy, can utilize less power to make cloth reach bigger stretching force, save construction cost, and reduce concrete structure to be caused new damage because the stretch-draw cloth needs.
Summary of the invention
In view of this, the method that the purpose of this invention is to provide a kind of strengthening concrete column by pre-stressed fiber cloth, employed device structure is simply light, the tension operation high efficiency, simple to operate easy, can execute less transverse stretching power, make cloth reach bigger vertical stretching force, obtain required prestressing force, reach concrete column is reinforced, suppress the purpose that the concrete column longitudinal crack produces and develops better, save construction cost, reduce engineering risk, the reduction of erection time, have significant Technological Economy comprehensive benefit.
The method of strengthening concrete column by pre-stressed fiber cloth of the present invention may further comprise the steps:
A. arrange tensioning equipment: described tensioning equipment comprises support and two groups of stretch-draw mechanisms that are arranged on the support, every group of stretch-draw mechanism includes connecting rod, tension rod and cloth turning-bar, described connecting rod is two, two connecting rod bottoms are fixedly connected to form plane frame structure by tension rod, the top is articulated in support, the cloth turning-bar between the pin joint of tension rod and connecting rod and two ends be connected with two connecting rods respectively, described two groups of stretch-draw mechanism lateral attitudes lay respectively at the both sides of support relatively; The frame bottom end face is provided with the draw-in groove parallel with tension rod, and the cross section of described draw-in groove and concrete column surface local are fitted shape and are stuck in and make tension rod be parallel to concrete column on the concrete column;
B. arrange cloth: with cloth along the concrete column circumferential arrangement, the cloth free end is walked around through the medial surface of tension rod and is pressed between the medial surface of cloth and tension rod after the cloth turning-bar turns round 180 °, to utilize the free end of frictional force anchoring fiber cloth;
C. transverse stretching: tension rod is applied inside external force, tension rod is inwardly rotated around the pin joint of connecting rod, tension rod medial surface extrusion fiber cloth free end and cloth itself, cloth free end and cloth itself produces frictional force the cloth free end played fixation, simultaneously cloth carried out transverse stretching;
D. anchoring: after treating that cloth is fitted by stretch-draw mechanism and concrete column surface, carry out anchoring by ground tackle.
Further, in the steps d, ground tackle comprises anchor bolt and pressing plate, and the anchoring section of cloth is pressed in the concrete column surface by pressing plate by anchor bolt, and the anchoring section of described cloth forms the wedge structure of thickening gradually to the end, and described wedge structure extends pressing plate;
Further, the wedge structure of described cloth extands rearward to anchoring section, and described wedge structure is by bonding the forming of two-layer at least cloth;
Further, described concrete column 10 cross sections are rectangle, and the cross section of described draw-in groove is a right angle type, among the step a, tensioning equipment is two, is arranged in concrete column 10 diagonal angles, among the step b, described cloth 9 is two sections and lays respectively between two tensioning equipments around the concrete column surface;
Further, support comprises longitudinal load-bearing beam and two support bars, form the portal frame structure by the fixedly connected support that makes of longitudinal load-bearing beam between the top of described two support bars, the longitudinal load-bearing beam is parallel to tension rod, draw-in groove on the support is arranged on the bottom of two support bars, and described two rod hinge connections are on the longitudinal load-bearing beam;
Further, hinged between described connecting rod and the longitudinal load-bearing beam is that single-degree-of-freedom is hinged, hinge axes parallel longitudinal direction carrier bar;
Further, the cross section of described cloth turning-bar is circular;
Further, the tension rod outer surface of described platy structure longitudinally fixedly installs at least one load bar;
Further, tension rod is a platy structure, and platy structure inner surface cross section is a rounding off;
Further, fixedly install on the described longitudinal load-bearing beam and be laterally hinged with ear, described connecting rod is hinged on the longitudinal load-bearing beam by being laterally hinged with ear; The bottom of described support bar is provided with base, and draw-in groove is arranged on the base.
The invention has the beneficial effects as follows: the method for strengthening concrete column by pre-stressed fiber cloth of the present invention, adopt the tensioning equipment of bar linkage structure, can carry out the stretch-draw action rapidly, easy and simple to handle easy, high efficiency, can execute less transverse stretching power, make cloth obtain enough big stretching force, correspondingly make concrete column obtain enough big radially compressive pre-stress, reach concrete column is reinforced, prevents that the surface longitudinal crackle from producing and the purpose of development, reduced tensioning equipment and technological requirement; Equipment stretching process cloth of the present invention is stressed, and evenly stretch-draw is effective, and tension operation is little to former concrete structure damage, can save construction cost greatly, reduces engineering risk, the reduction of erection time, has significant Technological Economy comprehensive benefit.
Description of drawings
Below in conjunction with drawings and Examples the present invention is further described.
The tensioning equipment structural representation that Fig. 1 uses for the present invention;
Fig. 2 be Fig. 1 along A-A to sectional view;
Fig. 3 is a tensioning equipment arrangement schematic diagram of the present invention;
Fig. 4 is a cloth anchor structure schematic diagram of the present invention.
The specific embodiment
The tensioning equipment structural representation that Fig. 1 uses for the present invention, Fig. 2 be Fig. 1 along A-A to sectional view, Fig. 3 is a tensioning equipment arrangement schematic diagram of the present invention, Fig. 4 is a cloth anchor structure schematic diagram of the present invention, as shown in the figure: the method for the strengthening concrete column by pre-stressed fiber cloth of present embodiment may further comprise the steps:
A. arrange tensioning equipment: described tensioning equipment comprises support and two groups of stretch-draw mechanisms that are arranged on the support, every group of stretch-draw mechanism includes connecting rod 2, tension rod 8 and cloth turning-bar 6, described connecting rod 2 is two, two connecting rod 2 bottoms are fixedly connected to form plane frame structure by tension rod 8, the top is articulated in support, cloth turning-bar 6 between the pin joint of tension rod 8 and connecting rod 2 and two ends be connected with two connecting rods 2 respectively, described two groups of stretch-draw mechanism lateral attitudes lay respectively at the both sides of support relatively; The frame bottom end face is provided with the draw-in groove parallel with tension rod 8, and the cross section of described draw-in groove and concrete column 10 surface locals are fitted shape and are stuck in and make tension rod 8 be parallel to concrete column on the concrete column 10; The cross sectional shape of draw-in groove is different and different according to the concrete column shape of cross section, if the concrete column shape of cross section is a rectangle, then the draw-in groove cross section is the right angle, if the concrete column shape of cross section is circular, then the draw-in groove cross section is an arc, guarantees that draw-in groove can be stuck in the concrete column surface;
B. arrange cloth: with cloth 9 along concrete column 10 circumferential arrangement, cloth 9 free ends are walked around through the medial surface of tension rod 8 and are pressed between the medial surface of cloth 9 and tension rod 8 after cloth turning-bar 6 turns round 180 °, to utilize the free end of frictional force anchoring fiber cloth 9;
C. transverse stretching: tension rod 8 is applied inside external force (direction of arrow among the figure), adopt the punching jack to realize in the present embodiment, certainly, also can adopt other force mechanism to realize; Tension rod 8 is inwardly rotated around the pin joint of connecting rod 2, tension rod 8 medial surface extrusion fiber cloth free ends and cloth 9 are own, cloth free end and cloth 9 itself produce frictional force the cloth free end are played fixation, simultaneously cloth are carried out transverse stretching;
D. anchoring: after treating that cloth 9 is fitted with certain prestressing force by stretch-draw mechanism and concrete column 10 surfaces, carry out anchoring by ground tackle.
In the steps d of present embodiment, ground tackle comprises anchor bolt 12 and pressing plate 11, the anchoring section of cloth 9 is pressed in concrete column 10 surfaces by pressing plate 11 by anchor bolt 12, and the anchoring section of described cloth 9 forms the wedge structure of thickening gradually to the end 91, and described wedge structure 91 extends pressing plate 11; Be beneficial to increase anchoring frictional force, can guarantee that the pre-stressed fiber cloth after the anchoring is not deviate from from ground tackle, prevent loss of prestress, thereby guarantee anchoring effect.
In the present embodiment, the wedge structure 91 of described cloth 9 extands rearward to anchoring section, and described wedge structure 91 adopts four layers of realization by bonding the forming of two-layer at least cloth in the present embodiment, easy to make, saves cost.
In the present embodiment, described concrete column 10 cross sections are rectangle, and the cross section of described draw-in groove is a right angle type, among the step a, tensioning equipment is two, is arranged in concrete column 10 diagonal angles, among the step b, described cloth 9 is two sections and lays respectively between two tensioning equipments around the concrete column surface; Avoid because cloth is long in the stretching process and the frictional force between the concrete column excessive, prevent that prestress distribution is inhomogeneous, thereby guarantee the stretch-draw effect.
In the present embodiment, support comprises longitudinal load-bearing beam 4 and two support bars 1, form the portal frame structure by the longitudinal load-bearing beam 4 fixedly connected supports that make between the top of described two support bars 1, longitudinal load-bearing beam 4 is parallel to tension rod 8, draw-in groove on the support is arranged on the bottom of two support bars 1, and described two connecting rods 2 are hinged on the longitudinal load-bearing beam 4; Simple and light, force-bearing situation is good, and is easy to use.
In the present embodiment, fixedly install on the described longitudinal load-bearing beam 4 and be laterally hinged with ear 3, described connecting rod 2 is hinged on the longitudinal load-bearing beam 4 by being laterally hinged with ear 3; Adopt hinged ear structure, be beneficial to installation and removal, can increase the slewing area of connecting rod 2, use reliable; The bottom of described support bar 1 is provided with base 13, and draw-in groove is arranged on the base 13, guarantees that tensioning equipment is stuck in the steadiness on the concrete column 10, thereby guarantees the stretch-draw effect.
In the present embodiment, hinged between described connecting rod 2 and the longitudinal load-bearing beam 4 is that single-degree-of-freedom is hinged, hinge axes parallel longitudinal direction carrier bar; Increase mechanism's rigidity, thereby guarantee the reliability of tension operation.
In the present embodiment, tension rod 8 is a platy structure, rounding off between platy structure inner surface and the bottom end face; Be beneficial to the protection cloth in the stretching process and be without prejudice, guarantee consolidation effect.
In the present embodiment, the cross section of described cloth turning-bar 6 is circular, guarantees not destroy cloth, thereby guarantees the stretch-draw effect.
In the present embodiment, tension rod 8 outer surfaces of described platy structure longitudinally fixedly install at least one load bar; Be that two load bars (being load bar 5 and load bar 7 among the figure) are set up in parallel in the present embodiment, bear lateral pressure, guarantee the intensity of tension rod, thereby guarantee the stretch-draw effect by the load bar.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. the method for a strengthening concrete column by pre-stressed fiber cloth is characterized in that: may further comprise the steps:
A. arrange tensioning equipment: described tensioning equipment comprises support and two groups of stretch-draw mechanisms that are arranged on the support, every group of stretch-draw mechanism includes connecting rod, tension rod and cloth turning-bar, described connecting rod is two, two connecting rod bottoms are fixedly connected to form plane frame structure by tension rod, the top is articulated in support, the cloth turning-bar between the pin joint of tension rod and connecting rod and two ends be connected with two connecting rods respectively, described two groups of stretch-draw mechanism lateral attitudes lay respectively at the both sides of support relatively; The frame bottom end face is provided with the draw-in groove parallel with tension rod, and the cross section of described draw-in groove and concrete column surface local are fitted shape and are stuck in and make tension rod be parallel to concrete column on the concrete column;
B. arrange cloth: with cloth along the concrete column circumferential arrangement, the cloth free end is walked around through the medial surface of tension rod and is pressed between the medial surface of cloth and tension rod after the cloth turning-bar turns round 180 °, to utilize the free end of frictional force anchoring fiber cloth;
C. transverse stretching: tension rod is applied inside external force, tension rod is inwardly rotated around the pin joint of connecting rod, tension rod medial surface extrusion fiber cloth free end and cloth itself, cloth free end and cloth itself produces frictional force the cloth free end played fixation, simultaneously cloth carried out transverse stretching;
D. anchoring: after treating that cloth is fitted by stretch-draw mechanism and concrete column surface, carry out anchoring by ground tackle.
2. the method for strengthening concrete column by pre-stressed fiber cloth according to claim 1, it is characterized in that: in the steps d, ground tackle comprises anchor bolt and pressing plate, the anchoring section of cloth is pressed in the concrete column surface by pressing plate by anchor bolt, the anchoring section of described cloth forms the wedge structure of thickening gradually to the end, and described wedge structure extends pressing plate.
3. the method for strengthening concrete column by pre-stressed fiber cloth according to claim 2, it is characterized in that: the wedge structure of described cloth extands rearward to anchoring section, and described wedge structure is by bonding the forming of two-layer at least cloth.
4. the method for strengthening concrete column by pre-stressed fiber cloth according to claim 3, it is characterized in that: described concrete column cross section is a rectangle, the cross section of described draw-in groove is a right angle type, among the step a, tensioning equipment is two, be arranged in the concrete column diagonal angle, among the step b, described cloth is two sections and lays respectively between two tensioning equipments around the concrete column surface.
5. the method for strengthening concrete column by pre-stressed fiber cloth according to claim 4, it is characterized in that: support comprises longitudinal load-bearing beam and two support bars, form the portal frame structure by the fixedly connected support that makes of longitudinal load-bearing beam between the top of described two support bars, the longitudinal load-bearing beam is parallel to tension rod, draw-in groove on the support is arranged on the bottom of two support bars, and described two rod hinge connections are on the longitudinal load-bearing beam.
6. the method for strengthening concrete column by pre-stressed fiber cloth according to claim 5 is characterized in that: between described connecting rod and the longitudinal load-bearing beam hinged for single-degree-of-freedom hinged, hinge axes parallel longitudinal direction carrier bar.
7. the method for strengthening concrete column by pre-stressed fiber cloth according to claim 6 is characterized in that: the cross section of described cloth turning-bar is for circular.
8. the method for strengthening concrete column by pre-stressed fiber cloth according to claim 7, it is characterized in that: described tension rod outer surface longitudinally fixedly installs at least one load bar.
9. the method for strengthening concrete column by pre-stressed fiber cloth according to claim 8, it is characterized in that: tension rod is a platy structure, platy structure inner surface cross section is a rounding off.
10. the method for strengthening concrete column by pre-stressed fiber cloth according to claim 9, it is characterized in that: fixedly install on the described longitudinal load-bearing beam and be laterally hinged with ear, described connecting rod is hinged on the longitudinal load-bearing beam by being laterally hinged with ear; The bottom of described support bar is provided with base, and draw-in groove is arranged on the base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101912085A CN101701497B (en) | 2009-10-23 | 2009-10-23 | Method for strengthening concrete column by pre-stressed fiber cloth |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101912085A CN101701497B (en) | 2009-10-23 | 2009-10-23 | Method for strengthening concrete column by pre-stressed fiber cloth |
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| CN101701497A CN101701497A (en) | 2010-05-05 |
| CN101701497B true CN101701497B (en) | 2011-04-20 |
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| CN2009101912085A Expired - Fee Related CN101701497B (en) | 2009-10-23 | 2009-10-23 | Method for strengthening concrete column by pre-stressed fiber cloth |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929254B (en) * | 2010-09-01 | 2011-09-28 | 中南大学 | Method for lapping and anchoring fiber sheet around rod to reinforce structural component |
| CN102373810B (en) * | 2011-11-22 | 2013-03-20 | 河北建筑工程学院 | Method for reinforcing wooded pillar by using prestressed basaltic fiber cloth |
| CN103556864B (en) * | 2013-11-25 | 2015-09-09 | 江苏省电力公司扬州供电公司 | A kind of electric pole laser-adjusting device and method of operating thereof |
| CN103790394B (en) * | 2014-02-19 | 2015-08-19 | 重庆交通大学 | Cylindrical concrete column is laid the method for prestressed carbon cloth |
| CN103806673B (en) * | 2014-02-19 | 2015-09-02 | 重庆交通大学 | For the carbon cloth tensioning equipment of reinforcement of concrete post punishment |
| CN110318558B (en) * | 2019-07-31 | 2023-06-06 | 南方工程检测修复技术研究院 | Prestress application device of prestress FRP reinforced cylindrical structure and construction method thereof |
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