CN101713252B - Method for reinforcing concrete structure by using prestressed fiber cloth - Google Patents
Method for reinforcing concrete structure by using prestressed fiber cloth Download PDFInfo
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- CN101713252B CN101713252B CN2009101914964A CN200910191496A CN101713252B CN 101713252 B CN101713252 B CN 101713252B CN 2009101914964 A CN2009101914964 A CN 2009101914964A CN 200910191496 A CN200910191496 A CN 200910191496A CN 101713252 B CN101713252 B CN 101713252B
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Abstract
The invention discloses a method for reinforcing concrete structure by using prestressed fiber cloth. The fiber cloth anchorage and tension stressed region adopts a wedge structure which is opposite to the prestressing direction; the tensioning equipment using a simple structure with tension counterforce beams and tension rods has the advantages of simple structure, light weight and simple operation; and the anchorage and tension stressed region in the wedge structure enables the fiber cloth to be stressed uniformly in the process of tensioning and anchorage, and the fiber cloth can not be damaged when large tensioning force is applied, so that the fiber cloth reaches large longitudinal tensioning force without prestressing loss, thereby inhibiting the production and development of longitudinal cracks in concrete posts. The tensioning operation of the invention can do little damage to the original concrete structure, and thus, the invention can greatly save the construction cost, reduce the engineering risk and shorten the construction period, and has obvious technical and economic comprehensive benefits.
Description
Technical field
The invention belongs to the structural engineering field, particularly a kind of method of reinforcing concrete structure by using prestressed 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 because cloth needs bigger stretching force, existing anchoring measure and tensioning equipment are difficult to obtain bigger stretching force, otherwise can cause the cloth damage; Existing tensioning equipment and anchoring measure simultaneously is inhomogeneous to the stretch-draw and the anchoring of cloth, causes loss of prestress after the anchoring easily, and anchoring effect is poor.
Therefore, the method that needs a kind of reinforcing concrete structure by using prestressed fiber cloth, employed device structure is simply light, high efficiency, simple to operately easily save construction cost, in stretch-draw and the anchoring process to the cloth uniform force application, apply big stretching force and also can not cause the cloth damage, can't cause loss of prestress.
Summary of the invention
In view of this, the method that the purpose of this invention is to provide a kind of reinforcing concrete structure by using prestressed fiber cloth, employed device structure is simply light, simple to operate easy, to the cloth uniform force application, apply big stretching force and also can not cause the cloth damage in stretch-draw and the anchoring process, make cloth reach bigger vertical stretching force, can't cause loss of prestress, suppress the purpose that the concrete column longitudinal crack produces and develops better, joint
About construction cost reduces engineering risk, the reduction of erection time, has significant Technological Economy comprehensive benefit.
The method of reinforcing concrete structure by using prestressed fiber cloth of the present invention may further comprise the steps:
A. arrange tensioning equipment: described tensioning equipment comprises stretch-draw reaction beam, tension rod and stretch-draw junction plate, described stretch-draw reaction beam comprises clamped beam section and stretch-draw beam section, described clamped beam section is fixedly installed on the concrete post and treats the concrete post surface that reinforced surface is adjacent, stretch-draw beam section is along laterally extending concrete post surface, described tension rod is parallel to the concrete post and treats that reinforced surface one end slidably passes stretch-draw beam section and connects the stretch-draw junction plate, and other end threaded engagement is provided with tensioning nut;
B. arrange cloth: cloth is treated the reinforced surface lateral arrangement along the concrete post, one end forms first anchoring section by the first ground tackle anchoring, the other end and stretch-draw junction plate are fixedly connected to form the stretch-draw section, and described cloth treats that with the concrete post the relative one side of reinforced surface scribbles bonding agent; Described first ground tackle comprises the first anchoring pressing plate and is fixedly installed on first anchor bolt that the concrete post is treated reinforced surface, the described first anchoring pressing plate is pressed on the concrete post by first anchor bolt with cloth first anchoring section and treats reinforced surface, described first anchoring section forms the wedge structure of thickening gradually to the end, and the thick end of described first anchoring section extends the first anchoring pressing plate; Described stretch-draw junction plate is a clamp region, and described stretch-draw junction plate is clamped the stretch-draw section by the stretch-draw bolt, and described stretch-draw section forms and the opposite wedge structure of first anchoring section thickening direction, and stretch-draw Duan Houduan extends the stretch-draw junction plate;
C. vertically stretch-draw: make tension rod apply vertical stretching force and reach the setting pulling force to cloth by screwing tensioning nut;
D. anchoring is finished: cloth is carried out anchoring near stretch-draw junction plate place by second ground tackle and is formed second anchoring section, described second ground tackle comprises the second anchoring pressing plate and is fixedly installed on second anchor bolt that the concrete post is treated reinforced surface, the described second anchoring pressing plate is pressed on the concrete post by second anchor bolt with second anchoring section and treats reinforced surface, described second anchoring section forms and the opposite wedge structure of first anchoring section thickening direction, and the thick end of described second anchoring section extends the second anchoring pressing plate;
E. roll extrusion is pasted: by the pressure of stepless action in the cloth external surface, make that cloth is closely connected treats reinforced surface in the concrete post.
Further, among the step a, angle steel before tensioning equipment also comprises, described before the interior angle of an angle steel along vertically being stuck in one jiao on concrete post and near the inboard pressure-bearing surface of stretch-draw reaction beam;
Further, be linked with auxiliary straight angle steel, be used for supplemental support stretch-draw junction plate, and the stretch-draw junction plate is kept with straight by the stretch-draw cloth preceding angle steel lower end.
Further, the wedge structure of described cloth first anchoring section, second anchoring section and stretch-draw section forms by the crisscross lay-up bonding of cloth;
Further, among the described step c, stretch-draw reaches 102% of design pulling force at least when finishing, and static determinacy is returned to the design pulling force at least after 2 minutes;
Further, in the steps d, after finishing, anchoring removes tensioning equipment;
Also comprise step f: after treating that bonding agent reaches design strength, remove the first anchoring pressing plate and the second anchoring pressing plate, and the outer excess fiber cloth of excision design sticking area, by designing requirement external surface is carried out protective treatment;
Further, along the stretch-draw reaction beam strip through-hole is set vertically, described clamped beam section is bolted to concrete post surface by what pass strip through-hole, and described tension rod passes stretch-draw beam section by strip through-hole;
Further, tensioning nut near stretch-draw beam section outer surface, is provided with plane bearing between described tensioning nut and the globular hinge structure by the globular hinge structure;
Further, on the described tension rod pulling force sensor is set, the signal output part of described pulling force sensor connects the pulling force signal processing system, and described pulling force signal processing system connects data output apparatus.
The invention has the beneficial effects as follows: the method for reinforcing concrete structure by using prestressed fiber cloth of the present invention, cloth anchoring and stretch-draw stress area adopt with prestress square to opposite wedge structure, adopt the tensioning equipment of comparatively simple stretch-draw reaction beam and tension rod structure, device structure is simply light, simple to operate easy, the anchoring of wedge structure and stretch-draw stress area make in stretch-draw and the anchoring process the cloth uniform force application, apply big stretching force and also can not cause the cloth damage, make cloth reach bigger vertical stretching force, can't cause loss of prestress, suppress the purpose that the concrete column longitudinal crack produces and develops better; Tension operation of the present invention 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.
Fig. 1 installs structural representation behind the tensioning equipment for the present invention;
Fig. 2 is that Figure 1A is to view;
Fig. 3 is that Figure 1B is to view.
The specific embodiment
Fig. 1 installs structural representation behind the tensioning equipment for the present invention, Fig. 2 be Figure 1A to view, Fig. 3 be Figure 1B to view, as shown in the figure: the method for the reinforcing concrete structure by using prestressed fiber cloth of present embodiment may further comprise the steps:
A. arrange tensioning equipment: described tensioning equipment comprises stretch-draw reaction beam 8, tension rod 16 and stretch-draw junction plate 6, described stretch-draw reaction beam 8 comprises clamped beam section 8a and stretch-draw beam section 8b, described clamped beam section 8a is fixedly installed on concrete post 1 and treats the concrete post surface 1b that reinforced surface 1a is adjacent, stretch-draw beam section 8b is along laterally extending concrete post surface 1b, described tension rod 16 is parallel to the concrete post and treats that reinforced surface 1a one end slidably passes stretch-draw beam section 8b and connects stretch-draw junction plate 6, other end threaded engagement is provided with tensioning nut 10, described tensioning nut 10 is near stretch-draw beam section 8b outer surface, and outer surface is meant a side for the treatment of reinforced surface 1a dorsad;
B. arrange cloth: cloth 2 is treated reinforced surface 1a lateral arrangement along concrete post 1, one end forms the first anchoring section 2a by the first ground tackle anchoring, the other end and stretch-draw junction plate 6 are fixedly connected to form stretch-draw section 2c, described cloth 2 treats that with concrete post 1 the relative one side of reinforced surface 1a scribbles bonding agent, and the present embodiment bonding agent adopts and is coated with the epoxy cement slurry; Described first ground tackle comprises the first anchoring pressing plate 14 and is fixedly installed on first anchor bolt 13 that concrete post 1 is treated reinforced surface 1a, the described first anchoring pressing plate 14 is pressed on concrete post 1 by first anchor bolt 13 with cloth 2 first anchoring section 2a and treats reinforced surface 1a, the described first anchoring section 2a forms the wedge structure of thickening gradually to the end, and the thick end of the described first anchoring section 2a extends the first anchoring pressing plate 14; Described stretch-draw junction plate 6 is a clamp region, and described stretch-draw junction plate 6 is clamped stretch-draw section 2c by stretch-draw bolt 5, and described stretch-draw section 2c forms and the opposite wedge structure of first anchoring section 2a thickening direction, and the thick end of stretch-draw section 2c extends stretch-draw junction plate 6; After the installation, cloth 2 horizontal hairs are parallel with the first anchoring pressing plate, 14 end edge and stretch-draw junction plate 6 end edge, and cloth is evenly stressed when guaranteeing stretch-draw;
C. vertically stretch-draw: make tension rod apply vertical stretching force and reach the setting pulling force to cloth by screwing tensioning nut; Vertically be with respect to cloth vertically for;
D. anchoring is finished: cloth 2 is carried out anchoring near stretch-draw junction plate 6 places by second ground tackle and is formed the second anchoring section 2b, described second ground tackle comprises the second anchoring pressing plate 4 and is fixedly installed on second anchor bolt 3 that concrete post 1 is treated reinforced surface 1a, the described second anchoring pressing plate 4 is pressed on concrete post 1 by second anchor bolt 3 with the second anchoring section 2b and treats reinforced surface 1a, the described second anchoring section 2b forms and the opposite wedge structure of first anchoring section 2a thickening direction, and the thick end of the described second anchoring section 2b extends the second anchoring pressing plate 4;
E. roll extrusion is pasted: by the pressure of stepless action in cloth 2 external surfaces, make that cloth 2 is closely connected treats reinforced surface 1a in concrete post 1; Present embodiment adopts cylinder to roll repeatedly, design sticking area carbon cloth is satisfied invade the stain requirement; Check carbon cloth and treat the closely connected situation of reinforced surface 1a, if exist the part slightly not closely connected, then available large-scale syringe infusion epoxy resin is guaranteed reliable bonding; If not closely connected zone is long, then should increases pressing plate and make it closely connected.
In the present embodiment, among the step a, an angle steel 7 before tensioning equipment also comprises, the interior angle edge of a described preceding angle steel 7 vertically is stuck in 1 one jiaos on concrete post and near stretch-draw reaction beam 8 inboard pressure-bearing surfaces, inboard pressure-bearing surface is meant the side of stretch-draw reaction beam near concrete post surface 1b; An angle steel 7 can prevent effectively that 8 pairs of concrete posts of stretch-draw reaction beam from causing damage for 1 jiao before when stretch-draw, thereby the functional performance and the outward appearance that guarantee concrete post 1 are not destroyed.
In the present embodiment, be linked with auxiliary straight angle steel 12, be used for supplemental support stretch-draw junction plate, and the stretch-draw junction plate is kept with straight by the stretch-draw cloth preceding angle steel 7 lower ends.
In the present embodiment, the wedge structure of described cloth 2 first anchoring section 2a, the second anchoring section 2b and stretch-draw section 2c forms by cloth 2 crisscross lay-up bondings; Guarantee stress.
In the present embodiment, among the described step c, in the stretching process, stretch-draw cloth stage by stage 2 is to builder's tonnage, and present embodiment adopts five-stage stretch-draw, stops after per stage stretch-draw afterwards observing more than 30 seconds having or not abnormal conditions, if do not have, then continues stretch-draw; Otherwise search reason and in time be adjusted to normal operative condition.
In the present embodiment, among the described step c, stretch-draw reaches 102% of design pulling force at least when finishing, and static determinacy is returned to the design pulling force at least after 2 minutes; To reduce relaxation loss.
In the present embodiment, in the steps d, after finishing, anchoring removes tensioning equipment;
Also comprise step f: after treating that bonding agent reaches design strength, remove the first anchoring pressing plate 14 and the second anchoring pressing plate 4, and the outer excess fiber cloth of excision design sticking area, by designing requirement external surface is carried out protective treatment.
In the present embodiment, along stretch-draw reaction beam 8 strip through-hole 8c is set vertically, described clamped beam section 8a is fixed on concrete post surface 1b by the bolt 17 that passes strip through-hole 8c, and described tension rod 16 passes stretch-draw beam section 8b by strip through-hole 8c; Can adjust the lateral attitude of stretch-draw reaction beam 8, thereby make the versatility of tensioning equipment stronger along concrete post surface 1b.
In the present embodiment, tensioning nut 10 near stretch-draw beam section outer surface, is provided with plane bearing 11 between described tensioning nut 10 and the globular hinge structure 9 by globular hinge structure 9; Globular hinge structure 9 makes tensioning nut 10 with automatic adaptation tension rod and the imperfect vertical situation of stretch-draw beam section outer surface, centering compliance is stronger, guarantee the stressed uniformity of stretching process cloth, plane bearing 11 can reduce by screwing the frictional force that nut reaches the stretch-draw purpose, thereby reduces construction power.
In the present embodiment, on the described tension rod 16 pulling force sensor 15 is set, the signal output part of described pulling force sensor 15 connects pulling force signal processing system (not marking among the figure), described pulling force signal processing system connects data output apparatus, in the work progress, carry out stretch-draw according to pulling force data comparatively intuitively, be beneficial to and guarantee the stretch-draw quality.
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 (9)
1. the method for a reinforcing concrete structure by using prestressed fiber cloth is characterized in that: may further comprise the steps:
A. arrange tensioning equipment: described tensioning equipment comprises stretch-draw reaction beam, tension rod and stretch-draw junction plate, described stretch-draw reaction beam comprises clamped beam section and stretch-draw beam section, described clamped beam section is fixedly installed on the concrete post and treats the concrete post surface that reinforced surface is adjacent, stretch-draw beam section is along laterally extending concrete post surface, described tension rod is parallel to the concrete post and treats that reinforced surface one end slidably passes stretch-draw beam section and connects the stretch-draw junction plate, and other end threaded engagement is provided with tensioning nut;
B. arrange cloth: cloth is treated the reinforced surface lateral arrangement along the concrete post, one end forms first anchoring section by the first ground tackle anchoring, the other end and stretch-draw junction plate are fixedly connected to form the stretch-draw section, and described cloth treats that with the concrete post the relative one side of reinforced surface scribbles bonding agent; Described first ground tackle comprises the first anchoring pressing plate and is fixedly installed on first anchor bolt that the concrete post is treated reinforced surface, the described first anchoring pressing plate is pressed on the concrete post by first anchor bolt with cloth first anchoring section and treats reinforced surface, described first anchoring section forms the wedge structure of thickening gradually to the end, and the thick end of described first anchoring section extends the first anchoring pressing plate; Described stretch-draw junction plate is a clamp region, and described stretch-draw junction plate is clamped the stretch-draw section by the stretch-draw bolt, and described stretch-draw section forms and the opposite wedge structure of first anchoring section thickening direction, and stretch-draw Duan Houduan extends the stretch-draw junction plate;
C. vertically stretch-draw: make tension rod apply vertical stretching force and reach the setting pulling force to cloth by screwing tensioning nut;
D. anchoring is finished: cloth is carried out anchoring near stretch-draw junction plate place by second ground tackle and is formed second anchoring section, described second ground tackle comprises the second anchoring pressing plate and is fixedly installed on second anchor bolt that the concrete post is treated reinforced surface, the described second anchoring pressing plate is pressed on the concrete post by second anchor bolt with second anchoring section and treats reinforced surface, described second anchoring section forms and the opposite wedge structure of first anchoring section thickening direction, and the thick end of described second anchoring section extends the second anchoring pressing plate;
E. roll extrusion is pasted: by the pressure of stepless action in the cloth external surface, make that cloth is closely connected treats reinforced surface in the concrete post.
2. the method for reinforcing concrete structure by using prestressed fiber cloth according to claim 1 is characterized in that: among the step a, an angle steel before tensioning equipment also comprises, described before the interior angle of an angle steel along vertically being stuck in one jiao on concrete post and near the inboard pressure-bearing surface of stretch-draw reaction beam.
3. the method for reinforcing concrete structure by using prestressed fiber cloth according to claim 2, it is characterized in that: among the described step a, be linked with auxiliary straight angle steel preceding angle steel lower end, be used for supplemental support stretch-draw junction plate and the stretch-draw junction plate is kept with straight by the stretch-draw cloth.
4. the method for reinforcing concrete structure by using prestressed fiber cloth according to claim 3 is characterized in that: the wedge structure of described cloth first anchoring section, second anchoring section and stretch-draw section forms by the crisscross lay-up bonding of cloth.
5. the method for reinforcing concrete structure by using prestressed fiber cloth according to claim 4 is characterized in that: among the described step c, reach 102% of design pulling force during the stretch-draw end at least, and static determinacy is returned to the design pulling force at least after 2 minutes.
6. the method for reinforcing concrete structure by using prestressed fiber cloth according to claim 5 is characterized in that: in the steps d, remove tensioning equipment after anchoring is finished;
Also comprise step f: after treating that bonding agent reaches design strength, remove the first anchoring pressing plate and the second anchoring pressing plate, and the outer excess fiber cloth of excision design sticking area, by designing requirement external surface is carried out protective treatment.
7. the method for reinforcing concrete structure by using prestressed fiber cloth according to claim 6, it is characterized in that: strip through-hole vertically is set along the stretch-draw reaction beam, described clamped beam section is bolted to concrete post surface by what pass strip through-hole, and described tension rod passes stretch-draw beam section by strip through-hole.
8. the method for reinforcing concrete structure by using prestressed fiber cloth according to claim 7 is characterized in that: tensioning nut near stretch-draw beam section outer surface, is provided with plane bearing between described tensioning nut and the globular hinge structure by the globular hinge structure.
9. the method for reinforcing concrete structure by using prestressed fiber cloth according to claim 8, it is characterized in that: on the described tension rod pulling force sensor is set, the signal output part of described pulling force sensor connects the pulling force signal processing system, and described pulling force signal processing system connects data output apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101914964A CN101713252B (en) | 2009-11-17 | 2009-11-17 | Method for reinforcing concrete structure by using prestressed fiber cloth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101914964A CN101713252B (en) | 2009-11-17 | 2009-11-17 | Method for reinforcing concrete structure by using prestressed fiber cloth |
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| Publication Number | Publication Date |
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| CN101713252A CN101713252A (en) | 2010-05-26 |
| CN101713252B true CN101713252B (en) | 2011-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101914964A Expired - Fee Related CN101713252B (en) | 2009-11-17 | 2009-11-17 | Method for reinforcing concrete structure by using prestressed fiber cloth |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102733618B (en) * | 2012-06-04 | 2014-09-10 | 河海大学 | Device and method for reinforcing concrete beams by prestressing fiber reinforce plastic (FRP) cloth material |
| CN102926551B (en) * | 2012-10-24 | 2015-02-18 | 广东工业大学 | Device and method for reinforcing flexural concrete member |
| CN102922602B (en) * | 2012-11-08 | 2014-10-08 | 东南大学 | Process for preparing prefabricated intelligent fiber reinforce plastic (FRP)-concrete composite structure |
| CN104775629B (en) * | 2015-04-14 | 2017-05-31 | 沈阳工业大学 | The method and apparatus of autocontrol fiber cloth prestressed stretch-draw |
| CN105569349B (en) * | 2015-12-25 | 2017-03-29 | 广东工业大学 | A kind of fiber cloth prestress application apparatus and method |
| CN107780596B (en) * | 2017-09-29 | 2020-10-30 | 马鞍山十七冶工程科技有限责任公司 | Anchoring structure system of FRP cloth and structural concrete and construction method thereof |
| CN108843039B (en) * | 2018-06-22 | 2020-09-11 | 北京建筑大学 | Method for reinforcing beam by prestressed carbon fiber plate |
| CN110410100B (en) * | 2019-07-13 | 2021-07-09 | 新疆大学 | Method for reinforcing left coal pillar on room-and-pillar coal face by using prestressed fiber cloth |
| 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 |
| CN112942146B (en) * | 2021-02-03 | 2023-02-03 | 中国建筑第八工程局有限公司 | Weld fatigue resistance reinforcing structure and reinforcing method thereof |
| CN115012670B (en) * | 2022-05-19 | 2024-06-28 | 上海师范大学 | Multi-layer anchoring connection method for fiber reinforced concrete beam column node |
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2009
- 2009-11-17 CN CN2009101914964A patent/CN101713252B/en not_active Expired - Fee Related
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Granted publication date: 20110810 Termination date: 20131117 |