CN106917517B - Construction method of prestress high-strength fiber cloth reinforced column member - Google Patents
Construction method of prestress high-strength fiber cloth reinforced column member Download PDFInfo
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- CN106917517B CN106917517B CN201710164216.5A CN201710164216A CN106917517B CN 106917517 B CN106917517 B CN 106917517B CN 201710164216 A CN201710164216 A CN 201710164216A CN 106917517 B CN106917517 B CN 106917517B
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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
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
Abstract
The invention relates to a construction method of a prestress high-strength fiber cloth reinforced column member, which comprises the following steps: (1) applying primer to the reinforcing part of the column member to be reinforced; (2) Winding one end of the cut fiber cloth on a steel rod for 2-3 layers, and gluing the other end of the cut fiber cloth by using glue to form a cloth ring; (3) locating and forming a straight groove on the long side of the reinforcing part; (4) Placing the steel bar in the straight groove, and winding fiber cloth on the reinforcing part of the column member to be reinforced; (5) Stretching the fiber cloth by using a stretching device, wherein a rack of the stretching device is clamped at the upper end and the lower end of a steel rod through a bayonet arranged at the tail end of the rack, and the cloth ring end of the fiber cloth is stretched; (6) coating glue on the fiber cloth; (7) after the glue is solidified, detaching the tensioning device; and (8) repairing and filling the straight groove. The construction method of the prestress high-strength fiber cloth reinforced column member can realize winding and tensioning of the fiber cloth on the column member to be reinforced, so that the fiber cloth is firmly wound, the reinforcing effect is good, the operation is simple and convenient, and the efficiency is high.
Description
Technical Field
The invention relates to a construction method of a prestress high-strength fiber cloth reinforced column member.
Background
The method for reinforcing the high-strength fiber composite material is a novel structure reinforcing technology which is recently developed, and generally uses polymeric resin to adhere fiber cloth to the surface of a member, so that the inner structure of the member and an outer fiber material work together to bear external load, thereby achieving the purpose of reinforcing and reinforcing. However, due to the secondary stress of the reinforcing structure, the fiber material can not exert the advantage of high strength before the structure is cracked, and the reinforcing effect is poor.
Disclosure of Invention
In view of the defects of the prior art, the technical problem to be solved by the invention is to provide a construction method for reinforcing a column member by using prestressed high-strength fiber cloth.
In order to solve the technical problems, the technical scheme of the invention is as follows: a construction method of a prestress high-strength fiber cloth reinforced column member comprises the following steps: (1) applying primer to the reinforcing part of the column member to be reinforced; (2) Winding one end of the cut fiber cloth on a steel rod for 2-3 layers, and gluing the other end of the cut fiber cloth by using glue to form a cloth ring; (3) locating and forming a straight groove on the long side of the reinforcing part; (4) Placing the steel bar in the straight groove, and winding fiber cloth on the reinforcing part of the column member to be reinforced; (5) Stretching the fiber cloth by using a stretching device, wherein a rack of the stretching device is clamped at the upper end and the lower end of a steel rod through a bayonet arranged at the tail end of the rack, and the cloth ring end of the fiber cloth is stretched; (6) coating glue on the fiber cloth; (7) after the glue is solidified, detaching the tensioning device; and (8) repairing and filling the straight groove.
Preferably, before step (1), the reinforced part of the column member to be reinforced needs to be polished, and the surface is repaired and leveled by a repairing material; if the structural corner exists in the column member to be reinforced, polishing a round chamfer angle of 20-30mm on the structural corner, and then determining the sizes of the fiber cloth and the steel rod and the pre-stress target value of tensioning.
Preferably, the tensioning device comprises a frame, a steel bar fixedly connected with one end of the fiber cloth is clamped at the tail end of the frame, a movable seat body is arranged at the front end of the frame, a rod body fixedly connected with a cloth ring of the fiber cloth is arranged on the movable seat body, and the movable seat body performs forward tensioning motion relative to the frame through horizontal screw rod adjustment.
Preferably, in the step (5), the rod body of the movable seat body on the tensioning device passes through the cloth ring of the fiber cloth, and the frame of the tensioning device is clamped at the upper end and the lower end of the steel rod through the bayonet arranged at the tail end of the frame.
Preferably, the frame includes the angle steel of vertical extension, the upper and lower end symmetry welding of angle steel has the limiting plate of vertical extension, all weld on the limiting plate and hold the power board that extends towards the rod iron side, hold the end of power board and all set firmly the bayonet socket.
Preferably, the angle between the holding plate and the limiting plate is 80-90 degrees, the bayonet faces the straight groove on the side face of the column member to be reinforced, and the outer sides of the two holding plates are connected into a whole through the vertically extending reinforcing plate.
Preferably, the movable seat body is located at the inner side of the frame, the movable seat body is in a U-shaped structure with an opening facing the steel bar, the bar body is a vertical screw bolt bolted on the U-shaped opening of the movable seat body, and a lock nut is screwed at the bottom end of the vertical screw bolt.
Preferably, the horizontal screw rod sequentially passes through the movable seat body and the angle steel and then is connected through an adjusting nut, the adjusting nut is positioned at the side of the angle steel, and the head part of the horizontal screw rod is positioned at the side of the movable seat body; a pressure sensor is arranged between the horizontal screw rod and the movable seat body.
Preferably, clamping pieces positioned on the inner side of the frame are arranged between the rod body and the steel rod, the number of the clamping pieces is two, the clamping pieces vertically extend, the clamping pieces are clamped with each other through clamping piece bolts and clamping piece nuts, and a fiber cloth penetrating channel is formed between the two clamping pieces.
Preferably, the steel bar comprises a cylindrical bar body, rectangular clamping rods are symmetrically and fixedly arranged at the upper end and the lower end of the bar body, and the shape of the bayonet is matched with the clamping rods.
Compared with the prior art, the invention has the following beneficial effects: the construction method of the prestress high-strength fiber cloth reinforced column member can be used for winding and tensioning the fiber cloth on the column member to be reinforced, so that the fiber cloth is firmly wound, the reinforcing effect is good, the operation is simple and convenient, and the efficiency is high.
The invention will be described in further detail with reference to the drawings and the detailed description.
Drawings
Fig. 1 is a schematic view of the construction of the tensioning device of the present invention.
Fig. 2 is a schematic view showing the structure of the tensioning device according to the present invention with steel bars removed.
Fig. 3 is a second schematic view of the structure of the tensioning device of the present invention.
Fig. 4 is a schematic view of a tensioning device according to the present invention.
Fig. 5 is a schematic view of the structure of the steel bar according to the present invention.
Detailed Description
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1 to 5, a construction method of a prestressed high-strength fiber cloth reinforced column member is characterized in that: the construction method comprises the following steps: (1) applying primer to the reinforcing portion of the column member 22 to be reinforced; (2) Winding one end of the cut fiber cloth 2 on a steel bar 3 for 2-3 layers, and gluing the other end of the cut fiber cloth with glue to form a cloth ring; (3) locating and forming a straight groove 4 on the long side of the reinforcing part; (4) Placing the steel bar in the straight groove, and winding fiber cloth on the reinforcing part of the column member to be reinforced; (5) Tensioning the fiber cloth by adopting a tensioning device, wherein a rack of the tensioning device is clamped at the upper end and the lower end of a steel rod through a bayonet arranged at the tail end of the rack, the cloth ring end of the fiber cloth is tensioned, and pretension force is applied to enable the fiber cloth to be wound on a column member to be reinforced like a tightening waistband; (6) coating glue on the fiber cloth; (7) After the glue is solidified, the tensioning device is disassembled, the tensioning device can be repeatedly utilized, a self-balancing system is formed by applying the pretension force of a single column member to be reinforced, no external load is added to the original structure column, and the tensioning device is suitable for tensioning and anchoring single-layer or multi-layer fiber cloth; and (8) repairing and filling the straight groove.
In the embodiment of the invention, before the step (1), the reinforced part of the column member to be reinforced needs to be polished, and the surface is repaired and leveled by a repairing material; if the structural corner exists in the column member to be reinforced, polishing a round chamfer angle of 20-30mm on the structural corner, and then determining the sizes of the fiber cloth and the steel rod and the pre-stress target value of tensioning.
In the embodiment of the invention, the repairing material can be cement or the like.
In the embodiment of the invention, the tensioning device comprises a frame 1, a steel rod 3 fixedly connected with one end of a fiber cloth 2 is clamped at the tail end of the frame, the front end of the frame is provided with a movable seat body 5, a rod body fixedly connected with a cloth ring of the fiber cloth is arranged on the movable seat body, and the movable seat body is adjusted by a horizontal screw rod 6 to perform forward tensioning movement relative to the frame.
In the embodiment of the invention, in the step (5), the rod body of the movable seat body on the tensioning device passes through the cloth ring of the fiber cloth, and the frame of the tensioning device is clamped at the upper end and the lower end of the steel rod through the bayonet arranged at the tail end of the frame, so that the steel rod end is clamped on the frame in the tensioning process, the sliding cannot be influenced by the tension force, the tensioning efficiency is high, the effect is good, and the force transmission path is clear.
In the embodiment of the invention, the frame comprises vertically extending angle steel 7, longitudinally extending limiting plates 8 are symmetrically welded at the upper end and the lower end of the angle steel, holding plates 9 extending towards the steel bar side are welded on the limiting plates, and bayonets 10 are fixedly arranged at the tail ends of the holding plates.
In the embodiment of the invention, the angle between the force holding plate and the limiting plate is 80-90 degrees, the bayonet faces the straight groove on the side surface of the column member to be reinforced, and the outer sides of the two force holding plates are connected into a whole through the vertically extending reinforcing plate 11.
In the embodiment of the invention, the movable seat body is positioned at the inner side of the frame, the movable seat body is in a U-shaped structure with an opening facing a steel rod, the rod body is a vertical screw rod 12 bolted on the U-shaped opening of the movable seat body, and the bottom end of the vertical screw rod is in threaded connection with a locking nut 13; when the movable seat is used, the other end of the fiber cloth is glued by glue to form a cloth ring 14, and after the vertical screw rod passes through the cloth ring, the vertical screw rod is locked on the movable seat body by the locking nut, so that the tension is facilitated.
In the embodiment of the invention, the horizontal screw rod sequentially passes through the movable seat body and the angle steel and then is connected through the adjusting nut 15, the adjusting nut is positioned at the side of the angle steel, and the head part of the horizontal screw rod is positioned at the side of the movable seat body; a pressure sensor 16 is arranged between the horizontal screw and the movable seat body, and tension prestress in the fiber cloth can be displayed and controlled through the pressure sensor.
In the embodiment of the invention, two clamping pieces 17 which are positioned at the inner side of the frame are arranged between the rod body and the steel rod, the two clamping pieces vertically extend, the two clamping pieces are clamped by a clamping piece bolt 18 and a clamping piece nut 19, and a fiber cloth penetrating channel is formed between the two clamping pieces; when the fiber cloth is used, the other end (stretching end) of the fiber cloth can penetrate through the two clamping pieces, the clamping pieces clamp the cloth ring gluing position of the stretching end of the fiber cloth, and the cloth ring gluing position is prevented from being stretched too much under the stress.
In the embodiment of the invention, the steel bar comprises a cylindrical bar body 20, rectangular clamping rods 21 are symmetrically and fixedly arranged at the upper end and the lower end of the bar body, the shape of the bayonet is matched with the clamping rods, and the cylindrical bar body is used for winding fiber cloth.
In the embodiment of the invention, the high-strength fiber cloth is wound and stuck on the column member to be reinforced in the circumferential direction, so that the ultimate bearing capacity and the ductility of the column member to be reinforced (such as a reinforced concrete column or a masonry structure column) can be improved; the fiber cloth is applied with a certain pretension force, so that the material utilization rate of the fiber cloth and the cracking load of the component can be improved, the crack width of the component can be reduced, the axial pressure limit bearing capacity of the component can be further improved, the fiber cloth can be used for reinforcing structures in underwater or humid environments, structures or components such as circular, rectangular and square section building structural columns and piers which mainly bear axial pressure can be reinforced, the occurrence and development of cracks can be delayed and reduced, the bearing capacity and the ductility performance of the fiber cloth can be improved, and the utilization efficiency of high-strength fiber cloth materials can be improved.
The specific implementation process comprises the following steps:
embodiment one: the column members to be reinforced are brick masonry columns: 756mm in height, 240mm by 370mm in column cross section; the strength grade of the common baked brick for masonry is MU20, and the strength grade of the masonry mortar is M10; the reinforcement mode adopts prestress fiber cloth strip type reinforcement, the net distance of the cloth strip is 80mm, the width of the high-strength carbon fiber cloth is 100mm, and the standard tensile strength value is 3470MPa; the section of the steel bar is phi 10mm and the length is 180mm.
The method comprises the following specific steps:
the first step: the portion to be reinforced of the brickwork column 22 is polished, the surface is repaired and leveled by the repairing material, and the corners of the column are polished to form chamfers of 20 mm.
And a second step of: cutting the fiber cloth into cloth strips 2 with the length of 1600mm, winding one end of the fiber cloth 2 around the steel rod 3 for 2-3 circles, coating matched glue of the fiber cloth, turning over the other end of the fiber cloth 2 by 120mm, and gluing the fiber cloth by the glue to form a cloth ring 14; the straight channel locations are located on the brickwork posts 22.
And a third step of: after ensuring that the two ends of the fiber cloth 2 are well adhered, surrounding the manufactured fiber cloth at a preset position of a column member to be reinforced, wherein a steel rod 3 is arranged in a straight groove, and a rod body 12 on a movable seat body 5 passes through a cloth ring 14;
fourth step: the clamping ends of the holding plates 9 of the tensioning device are clamped with the upper end 21 and the lower end 21 of the steel bar.
Fifth step, the method comprises the following steps; the clamping piece 17 is used for clamping the gluing part of the stretching end cloth ring of the fiber cloth.
Sixth step: the horizontal screw rod 6 sequentially passes through the movable seat body 5 and the angle steel 7 and is connected with the movable seat body through the adjusting nut 15.
Seventh step: the adjusting nut 15 on the horizontal screw is screwed, and the stress in the fiber cloth is displayed and controlled to reach the preset design stress through the pressure sensor 16, and in the embodiment, the stretching stress of the stretching end is controlled to be 600MPa.
Eighth step: after tensioning, the fiber cloth 2 is coated with matched glue.
Ninth step: and after the glue is thoroughly solidified, the tensioning device is dismounted.
Tenth step: the straight groove is repaired by cement, and the straight groove is filled with carbon fiber cloth matched glue.
The test result shows that the ultimate strength of the test column with the control stress of 600MPa in the fiber cloth is 10.59MPa, which is improved by 15% compared with the ultimate strength of 9.25MPa of the reinforced column in the common mode, and is improved by 46% compared with the ultimate strength of 7.31MPa of the unreinforced column, which shows that the construction method of the prestress high-strength fiber cloth reinforced column member is effective.
The present invention is not limited to the above-described preferred embodiments, and any person can obtain various other forms of construction methods for the prestressed high-strength fiber cloth reinforcement column member in light of the present invention. All equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.
Claims (9)
1. A construction method of a prestress high-strength fiber cloth reinforced column member is characterized by comprising the following steps: the construction method comprises the following steps: (1) applying primer to the reinforcing part of the column member to be reinforced; (2) Winding one end of the cut fiber cloth on a steel rod for 2-3 layers, and gluing the other end of the cut fiber cloth by using glue to form a cloth ring; (3) locating and forming a straight groove on the long side of the reinforcing part; (4) Placing the steel bar in the straight groove, and winding fiber cloth on the reinforcing part of the column member to be reinforced; (5) Stretching the fiber cloth by using a stretching device, wherein a rack of the stretching device is clamped at the upper end and the lower end of a steel rod through a bayonet arranged at the tail end of the rack, and the cloth ring end of the fiber cloth is stretched; (6) coating glue on the fiber cloth; (7) after the glue is solidified, detaching the tensioning device; (8) repairing and filling the straight groove; the tensioning device comprises a frame, a steel rod fixedly connected with one end of the fiber cloth is clamped at the tail end of the frame, a movable seat body is arranged at the front end of the frame, a rod body fixedly connected with a cloth ring of the fiber cloth is arranged on the movable seat body, and the movable seat body performs forward tensioning motion relative to the frame through horizontal screw rod adjustment.
2. The construction method of the prestress high-strength fiber cloth reinforced column member according to claim 1, wherein: before the step (1), polishing the reinforced part of the column member to be reinforced, and repairing the surface with a repairing material; if the structural corner exists in the column member to be reinforced, polishing a round chamfer angle of 20-30mm on the structural corner, and then determining the sizes of the fiber cloth and the steel rod and the pre-stress target value of tensioning.
3. The construction method of the prestress high-strength fiber cloth reinforced column member according to claim 1, wherein: in the step (5), a rod body of the movable seat body on the tensioning device penetrates through a cloth ring of the fiber cloth, and a rack of the tensioning device is clamped at the upper end and the lower end of the steel rod through a bayonet arranged at the tail end of the rack.
4. The construction method of the prestress high-strength fiber cloth reinforced column member according to claim 1, wherein: the frame includes the angle steel of vertical extension, the upper and lower end symmetry welding of angle steel has the limiting plate of vertical extension, all weld on the limiting plate and hold the power board towards the extension of steel bar side, hold the end of power board and all set firmly the bayonet socket.
5. The construction method of the prestressed high-strength fiber cloth reinforced column member according to claim 4, wherein: the angle between the holding plate and the limiting plate is 80-90 degrees, the bayonet faces the straight groove on the side face of the column member to be reinforced, and the outer sides of the two holding plates are connected into a whole through the vertically extending reinforcing plate.
6. The construction method of the prestress high-strength fiber cloth reinforced column member according to claim 1, wherein: the movable seat body is located at the inner side of the frame, the movable seat body is of a U-shaped structure with an opening facing the steel bar, the bar body is a vertical screw bolt connected to the U-shaped opening of the movable seat body in a bolting mode, and a lock nut is connected to the bottom end of the vertical screw bolt in a screwed mode.
7. The construction method of the prestressed high-strength fiber cloth reinforced column member according to claim 4, wherein: the horizontal screw rod sequentially penetrates through the movable seat body and the angle steel and then is connected through an adjusting nut, the adjusting nut is positioned at the side of the angle steel, and the head of the horizontal screw rod is positioned at the side of the movable seat body; a pressure sensor is arranged between the horizontal screw rod and the movable seat body.
8. The construction method of the prestress high-strength fiber cloth reinforced column member according to claim 1, wherein: clamping pieces positioned on the inner side of the frame are arranged between the rod body and the steel rod, the number of the clamping pieces is two, the clamping pieces vertically extend, the clamping pieces are clamped with each other through clamping piece bolts and clamping piece nuts, and a fiber cloth penetrating channel is formed between the two clamping pieces.
9. The construction method of the prestressed high-strength fiber cloth reinforced column member according to claim 4, wherein: the steel bar comprises a cylindrical bar body, rectangular clamping rods are symmetrically and fixedly arranged at the upper end and the lower end of the bar body, and the shape of the bayonet is matched with the clamping rods.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710164216.5A CN106917517B (en) | 2017-03-20 | 2017-03-20 | Construction method of prestress high-strength fiber cloth reinforced column member |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710164216.5A CN106917517B (en) | 2017-03-20 | 2017-03-20 | Construction method of prestress high-strength fiber cloth reinforced column member |
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| CN106917517B true CN106917517B (en) | 2023-05-05 |
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Families Citing this family (3)
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| CN108505761B (en) * | 2018-03-28 | 2020-12-11 | 中建八局第三建设有限公司 | Plugging method for prefabricated column bottom reserved grouting joint |
| CN109537475B (en) * | 2018-11-26 | 2023-07-14 | 山东交通学院 | Method for reinforcing capping beam by using carbon fiber and reinforcing structure |
| CN109826112B (en) * | 2019-02-27 | 2023-12-26 | 南京曼卡特科技有限公司 | Multilayer carbon fiber cloth prestressing force ground tackle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101736912B (en) * | 2009-12-03 | 2012-05-09 | 吴智深 | Anchorage method based on technique of bonding and reinforcement outside prestressed fiber cloth |
| CN102121316B (en) * | 2011-01-12 | 2012-12-12 | 北京交通大学 | Construction method for reinforcing circular structures by pre-tensioned high-strength fiber cloth |
| CN102644384B (en) * | 2012-03-12 | 2014-08-06 | 河海大学 | Anchoring device for reinforcing reinforced concrete beam by using FRP (Fiber Reinforce Plastic) strip and using method thereof |
| CN204311761U (en) * | 2014-12-15 | 2015-05-06 | 重庆交通大学 | A kind of prestressed carbon cloth reinforced concrete column tensioning equipment |
| CN105064694B (en) * | 2015-08-06 | 2017-04-12 | 湖南大学 | Tensioning device for applying pretensioning force to fiber cloth materials and tensioning method of tensioning device |
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