CN111155784B - Prestressed FRP plate reverse tensioning anchor assembly and application method thereof - Google Patents
Prestressed FRP plate reverse tensioning anchor assembly and application method thereof Download PDFInfo
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- CN111155784B CN111155784B CN202010061550.XA CN202010061550A CN111155784B CN 111155784 B CN111155784 B CN 111155784B CN 202010061550 A CN202010061550 A CN 202010061550A CN 111155784 B CN111155784 B CN 111155784B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000011148 porous material Substances 0.000 claims description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 10
- 238000004873 anchoring Methods 0.000 description 8
- 230000002787 reinforcement Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003733 fiber-reinforced composite Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- E04G23/0244—Increasing or restoring the load-bearing capacity of building construction elements of beams at places of holes, e.g. drilled in them
-
- 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
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
- E04G2023/0262—Devices specifically adapted for anchoring the fiber reinforced plastic elements, e.g. to avoid peeling off
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a prestressed FRP plate reverse tensioning anchor assembly and a use method thereof, wherein the assembly comprises a tensioning end assembly and a fixed end assembly, and the tensioning end assembly comprises a tensioning end pedestal, a tensioning end anchor, a pedestal attachment, an anchor attachment, a counter-force top plate, a tensioning screw and a jack; the application method of the assembly comprises the following steps: (S1) a fixed tension end mount and a fixed end mount; (S2) a stationary mount attachment and an anchor attachment; (S3) fixing the FRP plate; (S4) securing the fixed end anchor and the tension end anchor; (S5) passing the tensioning screw through the anchor attachment, the pedestal attachment and the counter-force top plate; (S6) a jack is arranged between the anchorage attachment and the counter-force top plate, and pretension force is applied to the FRP plate; (S7) removing the pedestal attachment, the anchor attachment, the counter-force top plate and the jack. The assembly can uniformly apply prestress to the FRP plate, reduces construction space, has simple device structure and is convenient for practical application.
Description
Technical Field
The invention relates to an anchoring assembly and a using method thereof, in particular to a prestressed FRP plate reverse tensioning anchoring assembly and a using method thereof.
Background
The fiber reinforced composite FRP has the advantages of light weight, high strength, good durability, convenient construction and the like, and the externally-attached FRP plate is widely applied to reinforcement of engineering structures. Experiments and engineering practice results show that FRP plates are only externally attached to the surface of a structure for reinforcement, FRP peeling failure frequently occurs, meanwhile, the reinforcement effect is very limited due to secondary stress and other reasons, the high-strength characteristic of the FRP cannot be fully exerted, and the FRP is passively reinforced. The external prestress anchoring technology and the FRP reinforcing technology are combined, so that the high-strength characteristic of the FRP material can be fully exerted, the utilization rate of the FRP is improved, the problem of stripping of the end part of the FRP plate can be well solved, the reinforcing effect is improved, and the FRP plate belongs to active reinforcement. The conventional prestress FRP plate reinforcement technology mostly adopts a forward tensioning method, tensioning platforms are arranged at two ends of a beam to be reinforced or jack baffles are arranged to complete tensioning work, the method needs a large operation space, the actual reinforcement length is reduced, and meanwhile, construction is limited due to limited space in the application of actual engineering. Patent document with publication number CN106193643a discloses a prestressed CFRP plate tensioning anchoring device for reinforcing steel beams and composite beams, the anchoring device uses a penetrating jack to be positioned at the outer side of the tensioning device, so that the construction space can be reduced, but the device adopts double jack construction, uneven force of jacks at two sides is easy to generate in the tensioning process, so that the tensioning is unbalanced, the applied prestress is difficult to achieve the expected effect, meanwhile, the penetrating jack is inconvenient to install and detach, the construction difficulty is increased, in addition, the device has wider width, more complex structure and larger steel consumption.
Disclosure of Invention
The invention aims to: the invention aims to provide a prestressed FRP plate reverse tensioning anchor assembly which can uniformly apply prestress to an FRP plate, saves construction space and is convenient for construction.
The technical scheme is as follows: the invention relates to a prestressed FRP plate reverse tensioning anchoring assembly, which comprises a tensioning end assembly and a fixed end assembly, wherein the tensioning end assembly comprises a tensioning end pedestal, tensioning end anchors, pedestal attachments, anchor attachments, a counter-force top plate, tensioning screws and jacks; the fixed end assembly comprises a fixed end pedestal and a fixed end anchorage.
The jack is a single small hydraulic jack, a group of first circular tunnels are formed in the side face of a vertical top plate of a tensioning end pedestal, a group of first internal threaded holes are formed in the bottom face of the vertical top plate, a pedestal attachment piece is provided with first additional internal threaded holes with the same diameter as the first internal threaded holes on the tensioning end pedestal, a tensioning end anchor is composed of an anchor cup and a wedge-shaped clamping piece, a pair of second circular tunnels corresponding to the first circular tunnels on the tensioning end pedestal are symmetrically formed in two sides of the anchor cup, a group of second internal threaded holes are formed in the bottom face of the tensioning end anchor, a group of second internal threaded holes with the same diameter as the second internal threaded holes on the tensioning end anchor are formed in the side face of the anchor attachment piece, a sliding tunnel corresponding to the first internal threaded holes on the tensioning end attachment piece is symmetrically arranged on the side face of the pedestal attachment piece, tensioning ends are threaded sections at two sides of the tensioning end, a tensioning middle section is formed by utilizing a first tensioning nut and a second tensioning end nut and the second tensioning end socket, the counter-force fixing end and the wedge-shaped clamping piece are respectively connected with the first tensioning end nut and the wedge-shaped clamping piece, and the counter-shaped anchoring end and the counter-force nut are connected with the wedge-shaped clamping piece through the first tensioning end and the wedge-shaped clamping piece.
The application method of the prestressed FRP plate reverse tensioning anchor assembly comprises the following steps:
(S1) fixing the tension end stand and the fixed end stand to the beam to be reinforced;
(S2) securing the abutment attachment and the anchor attachment to the tensioning end abutment and the tensioning end anchor;
(S3) clamping one end of the FRP plate in a tensioning end anchor, and fixing the other end in a fixed end anchor;
(S4) fixedly connecting the fixed end anchor with the fixed end pedestal through a nut by utilizing the fixed end fixing screw, fixing the tensioning end fixing screw on the tensioning end anchor through the nut, penetrating the tensioning end fixing screw through the tensioning end pedestal, and sleeving a fixing nut at the tail end;
(S5) two tensioning screws penetrate through two sides of the anchorage attachment and are screwed into the pedestal attachment, and the counter-force top plate is fixed on the tensioning screws;
(S6) a jack is arranged between the anchor attachment and the counter-force top plate, the jack pushes the anchor attachment to drive the tension end anchor to move, and pretension force is applied to the FRP plate;
and (S7) after the tensioning design value is reached, locking a fixing nut at the tail end of a fixing screw at the tensioning end, stopping oil supply by the jack, taking down the jack after the pushing force is released, and then removing the pedestal attachment, the anchor attachment and the counter-force top plate.
In the step S1, the tensioning end pedestal and the fixing end pedestal are fixed on the beam to be reinforced through high-strength bolts, welding or anchor bolts.
The beneficial effects are that: compared with the prior art, the invention has the remarkable advantages that: 1. the FRP plate can be uniformly tensioned and prestressed; 2. the jack is positioned at the inner side of the anchor, so that the operation space required by construction can be obviously reduced, and the jack is convenient to use in practical application; 3. the tensioning anchor assembly is light, the steel consumption is small, and the jack is directly placed between the anchor accessory and the counter-force top plate, so that the tensioning anchor assembly is convenient to use and detach.
Drawings
FIG. 1 is a front elevational view of the structure of the present invention;
FIG. 2 is a bottom view of the structure of the present invention;
FIG. 3 is a schematic view of a tensioning end bench;
FIG. 4 is a schematic diagram of a fixed end stage;
FIG. 5 is a schematic view of a tensioning end anchor construction;
FIG. 6 is a schematic illustration of a fixed end anchor configuration;
FIG. 7 is a schematic view of a pedestal attachment;
FIG. 8 is a schematic view of an anchor attachment configuration;
FIG. 9 is a schematic view of a reaction top plate structure;
FIG. 10 is a schematic view of the FRP plate and beam structure after completion of the tensioning.
Detailed Description
As shown in fig. 1 to 9, the reverse tension anchoring assembly of the prestress FRP plate comprises a tension end assembly and a fixed end assembly, the tension end assembly comprises a tension end pedestal 2, a tension end anchor 3, a pedestal attachment 4, an anchor attachment 5, a counter-force top plate 6, a tension screw 8 and a jack 9, the tension end pedestal 2 consists of a bottom plate 2-1 and a vertical top plate 2-2, 3 reinforcing ribs 2-3 are further arranged, a group of first circular holes are arranged on the side surface of the vertical top plate 2-2 of the tension end pedestal 2, a group of first internal threaded holes are arranged on the bottom surface of the vertical top plate 2-2, a first additional internal threaded hole with the same diameter as the first internal threaded holes on the tension end pedestal 2 is arranged on the pedestal attachment 4, the pedestal attachment 4 is fixedly connected below the tension end pedestal 2 through bolts, the tension end anchor 3 consists of an anchor cup 3-1 and a wedge-shaped clamping piece 3-2, the FRP plate 1 is clamped by mechanical friction force generated by extrusion between the anchor cup 3-1 and the wedge-shaped clamping piece 3-2, a pair of second circular pore canals corresponding to the first circular pore canals on the tensioning end pedestal 2 are symmetrically arranged on two sides of the anchor cup 3-1, a group of second internal threaded holes are arranged on the bottom surface of the tensioning end anchor 3, a second additional internal threaded hole with the same diameter as the second internal threaded hole on the tensioning end anchor 3 is arranged at the corresponding position of the anchor attachment 5, the tensioning end pedestal 2 and the tensioning end anchor 3 are connected through a tensioning end fixing screw rod 7 and are fixed at the opposite positions by nuts, the anchor attachment 5 is fixedly connected below the tensioning end anchor 3 by bolts, the side surface of the tensioning end anchor attachment 4 is symmetrically provided with a first tensioning pore canal positioned outside the first additional internal threaded hole, the side surfaces of the anchor attachment 5 are symmetrically provided with sliding holes corresponding to the first stretching holes on the pedestal attachment 4, the two sides of the counter-force top plate 6 are symmetrically provided with second stretching holes corresponding to the first stretching holes and the sliding holes, the first stretching holes are internal thread holes, the two ends of the stretching screw 8 are thread sections, the middle is smooth section, the two stretching screws 8 respectively pass through the first stretching holes on the two sides of the pedestal attachment 4 in sequence, the sliding holes of the anchor attachment 5 are connected with the second stretching holes of the counter-force top plate 6, the stretching screw 8 is fixed with the first stretching holes and the second stretching holes by utilizing a first counter-force nut 12 and a second counter-force nut 13, the jack 9 applies prestress to the FRP plate 1 by pushing the stretching end 3 and the anchor attachment 5, and the jack 9 is a single-branch small hydraulic jack; the fixed end assembly comprises a fixed end pedestal 10 and fixed end anchors 11, wherein the fixed end pedestal 10 consists of a fixed end bottom plate 10-1 and a fixed end vertical top plate 10-2, 3 fixed end reinforcing ribs 10-3 are arranged, first circular holes are formed in two sides of the fixed end vertical top plate 10-2, the fixed end anchors 11 consist of fixed end anchor cups 11-1 and fixed end wedge-shaped clamping pieces 11-2, second circular holes corresponding to the first circular holes are symmetrically formed in two sides of the fixed end anchor cups 11-1, and fixed end fixing screws 15 penetrate through the first circular holes and the second circular holes to connect the fixed end pedestal 10 with the fixed end anchors 11 and fix the relative positions by means of nut locking.
When in use, the tensioning end pedestal 2 and the fixing end pedestal 10 are fixed on the lower flange of the H-shaped steel beam to be reinforced by high-strength bolts, the pedestal attachment 4 and the anchor attachment 5 are respectively fixed on the tensioning end pedestal 2 and the tensioning end anchor 3 by bolts, the two ends of the FRP plate 1 are respectively wedged into the anchor cup 3-1 and the fixing end anchor cup 11-1 by the wedge-shaped clamping piece 3-2 and the fixing end wedge-shaped clamping piece 11-2, the FRP plate 1 is clamped by means of mechanical friction, the fixing end anchor 11 is fixedly connected with the fixing end pedestal 10 by nuts by the fixing end fixing screw 15, the fixing end fixing screw 7 is fixed on the tensioning end anchor 3 by nuts, the relative positions of the tensioning end pedestal 2 and the tensioning end anchor 3 are fixed, the tensioning end fixing screw 7 passes through the tensioning end pedestal 2, the fixing nuts 14 are sleeved at the ends, the tensioning screw rod 8 passes through the sliding hole of the anchorage attachment 5 to be screwed into the first tensioning hole of the pedestal attachment 4, the first counter-force nut 12 is screwed on the outer side of the pedestal attachment 4, then the counter-force top plate 6 passes through the tensioning screw rod 8, the second counter-force nuts 13 are screwed on the two sides of the counter-force top plate 6, the jack 9 is arranged between the anchorage attachment 5 and the counter-force top plate 6, the jack 9 is started to push the anchorage attachment 5 to drive the tension end anchorage 3 to move, the pretension force is applied to the FRP plate 1, the monitor is used for monitoring the applied jacking force, when the applied jacking force enables the FRP plate 1 to reach the tensioning design value, the end fixing nut 14 of the tension end fixing screw rod 7 is locked, the jack 9 is controlled to stop oil supply, the jack 9 is firstly taken down after the jacking force is released, then the pedestal attachment 4, the anchorage attachment 5 and the counter-force top plate 6 are sequentially taken down, a schematic diagram of the FRP plate and beam structure after tensioning is shown in FIG. 10.
Claims (1)
1. The application method of the prestress FRP plate reverse tensioning anchor assembly is characterized in that the prestress FRP plate reverse tensioning anchor assembly comprises a tensioning end assembly and a fixed end assembly, the tensioning end assembly comprises a tensioning end pedestal (2), a tensioning end anchor (3), two pedestal attachment pieces (4), two anchor attachment pieces (5), a counter-force top plate (6), tensioning screws (8) and jacks (9), the tensioning end pedestal (2) consists of a bottom plate (2-1), reinforcing ribs (2-3) and vertical top plates (2-2), the tensioning end pedestal (2) and the tensioning end anchor (3) are connected through tensioning end fixing screws (7), the pedestal attachment pieces (4) are fixedly connected below the tensioning end pedestal (2), the tensioning screws (8) penetrate through the two pedestal attachment pieces (4) and the two side end portions of the anchor attachment pieces (5) and are connected with the top plates (6) respectively, and the jacks (9) are arranged between the anchor attachment pieces (5) and the counter-force anchor attachment pieces (6) and the FRP plate (1) through the tensioning end fixing screws (7); the fixed end assembly comprises a fixed end pedestal (10) and a fixed end anchorage (11);
the side surface of the pedestal attachment (4) is symmetrically provided with a first stretching pore channel positioned outside the first additional internal threaded hole, the side surface of the anchor attachment (5) is symmetrically provided with a sliding pore channel corresponding to the first stretching pore channel on the pedestal attachment (4), and two sides of the counter-force top plate (6) are symmetrically provided with a second stretching pore channel corresponding to the first stretching pore channel and the sliding pore channel;
the method comprises the following steps:
(S1) fixing a tensioning end pedestal (2) and a fixed end pedestal (10) on a beam to be reinforced;
(S2) fixing the pedestal attachment (4) and the anchor attachment (5) on the tensioning end pedestal (2) and the tensioning end anchor (3);
(S3) clamping one end of the FRP plate (1) in the tensioning end anchor (3), and fixing the other end in the fixed end anchor (11);
(S4) fixedly connecting a fixed end anchor (11) with a fixed end pedestal (10) through a nut by utilizing a fixed end fixing screw (15), fixing a tensioning end fixing screw (7) on a tensioning end anchor (3) through the nut, penetrating the tensioning end fixing screw (7) through the tensioning end pedestal (2), and sleeving a fixing nut (14) at the tail end;
(S5) two tensioning screws (8) penetrate through two sides of the anchor attachment (5) and are screwed into the pedestal attachment (4), and the counter-force top plate (6) is fixed on the tensioning screws (8);
(S6) a jack (9) is arranged between the anchorage additional piece (5) and the counter-force top plate (6), the anchorage additional piece (5) is pushed by the jack (9) to drive the tension end anchorage device (3) to move, and pretension force is applied to the FRP plate (1);
and (S7) locking a terminal fixing nut (14) of a tensioning end fixing screw (7) after reaching a tensioning design value, stopping oil supply of the jack (9), taking down the jack (9) after releasing the pushing force, and then removing the pedestal attachment (4), the anchor attachment (5) and the counter-force top plate (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010061550.XA CN111155784B (en) | 2020-01-19 | 2020-01-19 | Prestressed FRP plate reverse tensioning anchor assembly and application method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010061550.XA CN111155784B (en) | 2020-01-19 | 2020-01-19 | Prestressed FRP plate reverse tensioning anchor assembly and application method thereof |
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| CN111155784A CN111155784A (en) | 2020-05-15 |
| CN111155784B true CN111155784B (en) | 2024-03-26 |
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Families Citing this family (1)
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| CN113431367A (en) * | 2021-06-30 | 2021-09-24 | 中国建筑第八工程局有限公司 | FRP plate structure for reinforcing member and reinforcing method thereof |
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|---|---|---|---|---|
| KR101531132B1 (en) * | 2014-04-29 | 2015-06-23 | 장성호 | Apparatus for extentional tension |
| CN105569372A (en) * | 2016-02-04 | 2016-05-11 | 广东工业大学 | Device and method for enhancing composite reinforced concrete through prestress fiber |
| CN105926949A (en) * | 2016-05-20 | 2016-09-07 | 北京特希达科技有限公司 | In-site tensioning system and method for reinforcing slab plate of integral prestress fiber board |
| CN108843037A (en) * | 2018-06-07 | 2018-11-20 | 桂林理工大学 | A kind of prestressed fiber cloth reinforced girder tensioning anchor and its construction method |
| CN111155783A (en) * | 2020-01-19 | 2020-05-15 | 河海大学 | Prestressed FRP plate reverse tensioning anchoring assembly and use method thereof |
| CN212359200U (en) * | 2020-01-19 | 2021-01-15 | 河海大学 | Reverse stretch-draw anchor subassembly of prestressing force FRP board |
| CN212359199U (en) * | 2020-01-19 | 2021-01-15 | 河海大学 | Reverse stretch-draw anchor subassembly of prestressing force FRP board |
-
2020
- 2020-01-19 CN CN202010061550.XA patent/CN111155784B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101531132B1 (en) * | 2014-04-29 | 2015-06-23 | 장성호 | Apparatus for extentional tension |
| CN105569372A (en) * | 2016-02-04 | 2016-05-11 | 广东工业大学 | Device and method for enhancing composite reinforced concrete through prestress fiber |
| CN105926949A (en) * | 2016-05-20 | 2016-09-07 | 北京特希达科技有限公司 | In-site tensioning system and method for reinforcing slab plate of integral prestress fiber board |
| CN108843037A (en) * | 2018-06-07 | 2018-11-20 | 桂林理工大学 | A kind of prestressed fiber cloth reinforced girder tensioning anchor and its construction method |
| CN111155783A (en) * | 2020-01-19 | 2020-05-15 | 河海大学 | Prestressed FRP plate reverse tensioning anchoring assembly and use method thereof |
| CN212359200U (en) * | 2020-01-19 | 2021-01-15 | 河海大学 | Reverse stretch-draw anchor subassembly of prestressing force FRP board |
| CN212359199U (en) * | 2020-01-19 | 2021-01-15 | 河海大学 | Reverse stretch-draw anchor subassembly of prestressing force FRP board |
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