CN108843040B - Carbon fiber plate inner curved surface clamping type anchorage device - Google Patents
Carbon fiber plate inner curved surface clamping type anchorage device Download PDFInfo
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- CN108843040B CN108843040B CN201810653356.3A CN201810653356A CN108843040B CN 108843040 B CN108843040 B CN 108843040B CN 201810653356 A CN201810653356 A CN 201810653356A CN 108843040 B CN108843040 B CN 108843040B
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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
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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
- 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
Abstract
The invention relates to a carbon fiber plate inner curved surface clamping type anchorage device which comprises an upper clamping plate and a lower clamping plate, wherein the upper clamping plate is fixedly connected with the lower clamping plate through a bolt; the surface of the upper clamping plate, which is opposite to the lower clamping plate, is in the shape of an inner curved surface, a through hole is formed between the inner curved surface of the upper clamping plate and the inner curved surface of the lower clamping plate, and a carbon fiber plate is clamped in the through hole; the height of the through hole is gradually increased from the middle position to the two ends of the through hole along the longitudinal direction, and the height of the through hole is increased to the end part of the through hole and is the same as the thickness of the clamped carbon fiber plate. The carbon fiber plate inner curved surface clamping type anchorage can avoid the carbon fiber plate from being subjected to overlarge shear stress; the problem of stress relaxation can be effectively solved, so that the carbon fiber plate is always in a stable and lasting good stress state; when the anchoring system bears a large load, a plurality of anchors can be connected in series to share the tensile force on the carbon fiber plate; the anchor has the advantages of simple structure, convenient manufacture and construction and strong practicability.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to a carbon fiber plate inner curved surface clamping type anchorage device.
Background
The carbon fiber plate has the outstanding advantages of high tensile strength, light dead weight, corrosion resistance, low looseness and the like, and can replace the traditional materials for reinforcing the reinforced concrete beam, such as steel plates, steel wires, reinforced concrete and the like. When the reinforced concrete beam is reinforced by the carbon fiber plates, the carbon fiber plates are usually anchored and fixed at two ends of the bottom surface of the beam.
At present, the commonly used carbon fiber plate anchor is provided with a clamping piece type anchor and a clamping plate type anchor, and the two types of anchors have the following defects: (1) the height of the through hole formed by the clamping plate is unchanged along the longitudinal direction, although the extrusion force of the anchoring area is larger, the extrusion force at the loaded end is suddenly changed to zero, so that the transverse shear stress of the section of the loaded end is very large, the stress is concentrated, and the carbon fiber plate is easily sheared off and even disconnected; (2) although the existing clamping plate type anchorage can adjust the extrusion force distribution of an anchoring area by adjusting the force of a bolt so as to enable the stress of a carbon fiber plate to be reasonable, the change of the force of the bolt is difficult to control in the actual operation; (3) the stress relaxation problem of the anchorage device is difficult to solve, although the clamping plate type anchorage device has an inner conical hole, the self-locking can be realized by sliding in the inner conical hole through the clamping plate, and a large number of tests prove that: after the stress is relaxed, the carbon fiber plate and the clamping piece are usually directly slipped, but the clamping piece and the inner conical hole are not slipped, so that the self-locking can not be realized in practice; (4) when the carbon fiber plate anchoring system is used for reinforcing a beam, if the load borne by the beam is large or the span of the beam is large, the tensile force borne by the carbon fiber plate is also large, only anchorage devices which are fixed at two ends of the beam are difficult to bear, at the moment, a plurality of anchorage devices are required to be arranged at the bottom of the beam, the anchorage devices are connected in series to share the tensile force, the existing anchorage devices can rarely realize the series connection function, even if a plurality of anchorage devices can be realized, but because the existing anchorage device structure has the problem of overlarge shearing force, the carbon fiber plate is easily cut off no matter how many anchorage devices are connected in series.
The above disadvantages cause the existing anchors to have poor anchoring performance, and some anchors have good anchoring performance, but have complex structures, which bring inconvenience to the manufacture and assembly, so that it is urgently needed to develop an anchor which has simple structure, good anchoring performance and is convenient to manufacture and assembly.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a carbon fiber plate inner curved surface clamping type anchorage device which comprises an upper clamping plate and a lower clamping plate, wherein the upper clamping plate is fixedly connected with the lower clamping plate through a bolt; the surface of the upper clamping plate, which is opposite to the lower clamping plate, is in the shape of an inner curved surface, a through hole is formed between the inner curved surface of the upper clamping plate and the inner curved surface of the lower clamping plate, and a carbon fiber plate is clamped in the through hole; the height of the through hole is gradually increased from the middle position to the two ends of the through hole along the longitudinal direction, and the height of the through hole is increased to the end part of the through hole and is the same as the thickness of the clamped carbon fiber plate.
Preferably, the middle area of the upper clamping plate and the lower clamping plate along the longitudinal direction is provided with an inner curved surface clamping area; and bolt fixing areas are arranged in the areas of the two side edge parts of the upper clamping plate and the lower clamping plate along the longitudinal direction.
In any of the above schemes, preferably, the inner curved surface clamping area of the upper clamping plate and the inner curved surface clamping area of the lower clamping plate are respectively provided with an inner curved surface.
In any of the above schemes, preferably, the intersection line of the inner curved surface of the upper clamping plate and the vertical longitudinal section of the anchor is an arc line, the arc line is determined by three points, and the three points are a point in the middle of the arc line and points at two ends of the arc line. Specifically, the three points are the intersection point of the arc line and the middle position of the inner curved surface of the upper clamping plate and the intersection point of the arc line and the two ends of the inner curved surface of the upper clamping plate.
In any of the above schemes, preferably, the intersection line of the inner curved surface of the lower clamping plate and the vertical longitudinal section of the anchor is an arc line, the arc line is determined by three points, and the three points are a point in the middle of the arc line and points at two ends of the arc line. Specifically, the three points are the intersection point of the arc line and the middle position of the inner curved surface of the lower clamping plate and the intersection point of the arc line and the two ends of the inner curved surface of the lower clamping plate.
In any of the above schemes, preferably, several layers of carbon fiber plates can be clamped in the through holes, and the total thickness of the carbon fiber plates is not more than 2 cm. At least one layer of carbon fiber plate is clamped in the through hole, and the thickness of the layer of carbon fiber plate is not more than 2 cm; if the plurality of layers of carbon fiber plates are clamped in the through holes, the total thickness of the plurality of layers of carbon fiber plates is not more than 2 cm. The thickness of the carbon fiber plate is determined according to specific construction conditions or the production specification of a manufacturer.
In any of the above embodiments, it is preferable that the length of the upper and lower clamping plates is 50 to 60 times the total thickness of the carbon fiber plate.
In any of the above aspects, it is preferable that the upper plate and the lower plate have a thickness of 2 to 5cm at both end positions in the longitudinal direction.
In any of the above aspects, it is preferable that the thickness of the upper and lower nip plates at both end positions in the longitudinal direction is 0.5 times the width of the carbon fiber plate and is in the range of 2 to 5 cm. The width of the carbon fiber plate is determined according to specific construction conditions or production specifications of manufacturers, and the thickness of the two ends of the upper clamping plate and the lower clamping plate is optimally 0.5 times of the width of the carbon fiber plate, but is ensured to be in the range of 2-5 cm.
In any of the above aspects, it is preferable that a difference between a thickness of the upper plate and the lower plate at a middle position and a thickness of the plate at both ends in the longitudinal direction is 10 to 15% of a total thickness of the carbon fiber plate.
In any of the above aspects, it is preferable that the compression amount of the carbon fiber sheet at the center position of the through hole is 10 to 15%.
In any of the above aspects, preferably, the bolt fixing area of the upper clamping plate and the bolt fixing area of the lower clamping plate are provided with a plurality of bolt holes.
In any of the above schemes, preferably, the bolt fixing areas on both sides of the upper clamping plate are respectively opposite to the bolt fixing areas on both sides of the lower clamping plate, and a positioning cushion plate is arranged between the opposite upper and lower bolt fixing areas.
In any of the above schemes, preferably, the positioning cushion plate is provided with bolt holes corresponding to the upper clamping plate and the lower clamping plate.
In any of the above solutions, preferably, the positioning pad is made of a steel plate, and the thickness of the positioning pad is the same as the total thickness of the carbon fiber plate.
In any of the above schemes, preferably, the surface of the through hole is roughened, for example, by a method of scoring, sand blasting, etc., and then an epoxy resin adhesive is applied after the roughening.
The carbon fiber plate inner curved surface clamping type anchorage device has the following beneficial effects:
(1) a through hole is formed between the inner curved surface of the upper clamping plate and the inner curved surface of the lower clamping plate, the middle position of the through hole is narrowest, the height of the through hole is gradually increased from the middle position to the two ends along the longitudinal direction, the height of the through hole is increased to the same as the thickness of the clamped carbon fiber plate, the extrusion force applied to the carbon fiber plate in the anchoring area is the largest at the middle position of the anchoring area, and is gradually reduced towards the two ends of the anchoring area, and the extrusion force at the loading end approaches zero; according to the distribution characteristics of the extrusion force in the anchoring area, the transverse shear stress borne by the carbon fiber plate is the largest at the end part of the anchorage device, and is gradually reduced to zero inwards, although the shear stress of the section of the loaded end is larger relative to the middle position of the anchoring area, in the range capable of being borne by the carbon fiber plate, compared with the shear stress concentration at the end part of the anchorage device in the prior art, the shear stress generated at the end part of the anchorage device is much smaller;
(2) the thickness of the positioning cushion plate is the same as that of the carbon fiber plate, the required through hole can be formed only by pressing the upper clamping plate and the lower clamping plate to be tightly attached to the positioning cushion plate, and the carbon fiber plate is clamped by the through hole, so that the operation is simple, and the force of the bolt does not need to be controlled and adjusted; if the through hole clamps the multiple layers of carbon fiber plates, the thickness of the positioning cushion plate is the same as the total thickness of the multiple layers of carbon fiber plates;
(3) in the range from the middle position of the through hole to the free end of the through hole, the carbon fiber plate is subjected to friction along the inner surfaces of the upper clamping plate and the lower clamping plate and resistance perpendicular to the inner surfaces, so that the carbon fiber plate is difficult to slide, and the stress characteristic can effectively avoid the sliding problem caused by stress relaxation; meanwhile, the extrusion force borne by the carbon fiber plate can be durable and effective within the range from the middle position of the through hole to the loading end; the front section and the rear section of the through hole work cooperatively, so that the carbon fiber plate is ensured to be in a long-term stable good stress state;
(4) when the carbon fiber plate inner curved surface clamping type anchorage device is used for reinforcing a concrete beam, a plurality of anchorage devices can be connected in series through the carbon fiber plates and are fixed at the bottom of the concrete beam, so that the overlarge tension borne by the carbon fiber plates is shared, and the problem of connection failure between the anchorage devices and the concrete due to overlarge tension is solved.
The invention also provides a method for reinforcing the beam by the prestressed carbon fiber plate, which comprises the following steps in sequence:
the method comprises the following steps: calculating the length of the carbon fiber plate for reinforcement according to the length of the beam to be reinforced, the material characteristics of the carbon fiber plate and the magnitude of the tension control stress, marking and intercepting;
step two: marking punching positions on the side surface of the beam to be reinforced according to the design positions of the tensioning end anchor backing plate, the fixed end anchor backing plate, the middle anchor backing plate I and the middle anchor backing plate II, wherein the marked punching positions correspond to holes of expansion bolts on the tensioning end anchor backing plate, the fixed end anchor backing plate, the middle anchor backing plate I and the middle anchor backing plate II, inserting an expansion pipe after drilling, and filling paste resin adhesive into the holes;
step three: before the resin adhesive is not solidified, screwing in an expansion bolt, and fixing a tensioning end anchor backing plate, a fixed end anchor backing plate, a middle anchor backing plate I and a middle anchor backing plate II at the designed positions;
step four: fixing the tensioning backing plate on the tensioning end anchor backing plate by using a tensioning backing plate bolt;
step five: anchoring one end of a carbon fiber plate on a carbon fiber plate anchorage device I at a tensioning end by using a clamping bolt, bolting a steel rod on a connecting steel plate, and bolting the connecting steel plate on one end of the carbon fiber plate anchorage device I at the tensioning end;
step six: clamping the carbon fiber plate by using a carbon fiber plate anchorage device II, a carbon fiber plate anchorage device III and a carbon fiber plate anchorage device IV, keeping the carbon fiber plate in a loose state, and then respectively connecting the carbon fiber plate with the bottom surfaces of the fixed end anchor backing plate, the middle anchor backing plate I and the middle anchor backing plate II;
step seven: the steel rod penetrates through a tensioning hole of the tensioning baffle, and then the carbon fiber plate anchorage device II is clamped and fixed on the bottom surface of the fixed end anchor backing plate;
step eight: symmetrically tensioning the steel rod by using a jack, clamping a carbon fiber plate anchorage device III when the tensioning stress reaches 40% of the tensioning control stress, and fixing the carbon fiber plate anchorage device III at the bottom of the middle anchor backing plate I; continuously stretching the steel rod, clamping the carbon fiber plate anchorage device IV when the stretching stress reaches 115% of the stretching control stress, and fixing the carbon fiber plate anchorage device IV at the bottom of the middle anchor backing plate II; unloading the jack, and fixing the carbon fiber plate anchorage device I at the bottom of the tensioning end anchor backing plate through a fixing bolt when the tensioning stress reaches the tensioning control stress; after the carbon fiber plate anchorage device III or the carbon fiber plate anchorage device IV is clamped and fixed, if the jack is about to reach the limit stroke, the jack is timely adjusted back to enable the initial stroke to be zero, and then tensioning is continued;
step nine: and (4) unloading the jack, and unloading the tensioning base plate and the connecting steel plate to finish the reinforcement of the beam to be reinforced.
And in the fourth step, during tensioning, fixedly connecting the tensioning backing plate with the tensioning end anchor backing plate by using a tensioning backing plate bolt, and after tensioning is finished, dismounting the tensioning backing plate bolt to separate the tensioning backing plate from the tensioning end anchor backing plate.
And step eight, symmetrically tensioning the steel rod by using jacks, namely simultaneously tensioning all the jacks so as to avoid tension eccentricity. When the jack is unloaded, the carbon fiber plate anchorage device I cannot be completely unloaded, and when the tension stress is unloaded to reach the tension control stress, the carbon fiber plate anchorage device I is fixed at the bottom of the tension end anchorage backing plate through the fixing bolt.
Preferably, the carbon fiber plate anchorage device I, the carbon fiber plate anchorage device II, the carbon fiber plate anchorage device III and the carbon fiber plate anchorage device IV have the same structure, and the structure is any one of the carbon fiber plate inner curved surface clamping type anchorage devices.
The method for reinforcing the beam by the prestressed carbon fiber plate has the following beneficial effects:
(1) a plurality of carbon fiber plate anchorage devices are connected in series at equal intervals at the bottom of a beam to be reinforced, and the carbon fiber plate anchorage devices are sequentially screwed through stretching the carbon fiber plates in a grading manner, so that each anchorage device shares a part of pulling force, thereby avoiding the defects that the pulling force of an anchorage point is too large and the anchorage point is easy to damage and lose efficacy due to the fact that only the anchorage at two ends bears the pulling force, being applicable to the reinforcement of long-span bridges, and enabling the prestress to be effective for a long time through reliable anchorage measures.
(2) The anchor backing plate is fixed on the side face by the bolt, so that the problem of difficult drilling caused by the intensive stress steel bars at the bottom when the beam bottom is fixed is solved; the bending moment generated by the anchor backing plate under the action of the tensile force of the bottom carbon fiber plate is beneficial to offsetting the bending moment generated by external load on the beam, and the prestress efficiency is improved.
(3) The steel rod is connected with the anchorage device at the tensioning end, the steel rod is tensioned by the jack, and if the jack reaches the limit stroke in the tensioning process, the jack can be adjusted back when any carbon fiber plate anchorage devices connected in series are sequentially clamped and fixed, so that the initial stroke of the jack is zero, and the carbon fiber plate can be tensioned again, and the problem that the stroke of the jack cannot meet the tensioning stroke of the carbon fiber plate can be solved.
Drawings
FIG. 1 is a schematic plan view of a preferred embodiment of a carbon fiber plate inside surface clamp anchor according to the present invention;
FIG. 2 is a schematic cross-sectional view A-A of the embodiment of FIG. 1 of a carbon fiber plate inside surface clamp anchor according to the present invention;
FIG. 3 is a schematic cross-sectional view B-B of the embodiment of FIG. 1 of a carbon fiber plate inside surface clamp anchor according to the present invention;
FIG. 4 is a schematic cross-sectional view C-C of the embodiment of FIG. 1 of a carbon fiber plate inside surface clamp anchor according to the present invention;
FIG. 5 is a front view of the carbon fiber panel inside surface clamping type anchorage of the embodiment shown in FIG. 1 before tensioning for reinforcing the beam in accordance with the present invention;
FIG. 6 is a bottom view of the method of reinforcing a beam in the embodiment of FIG. 1 of a carbon fiber plate inside surface clamp anchor according to the present invention;
FIG. 7 is a front view of the carbon fiber panel inside surface clamping anchor of the embodiment of FIG. 1 after tensioning for a method of reinforcing a beam according to the present invention;
FIG. 8 is a three-dimensional view of a tensioned pad of the method of reinforcing a beam in the embodiment of FIG. 1 of a carbon fiber panel inside surface clamp anchor according to the present invention;
FIG. 9 is a three-dimensional view of a tension end anchor pad of the method of reinforcing a beam in the embodiment of FIG. 1 of a carbon fiber plate inside surface clamp anchor according to the present invention;
FIG. 10 is a three-dimensional view of a fixed end anchor pad of the method of reinforcing a beam in the embodiment of FIG. 1 of a carbon fiber panel inside surface grip anchor according to the present invention.
The figures are labeled as follows:
1-an upper clamping plate, 2-a lower clamping plate, 3-a bolt, 4-an inner curved surface of the upper clamping plate, 5-an inner curved surface of the lower clamping plate, 6-a through hole, 7-a carbon fiber plate, 8-an inner curved surface clamping area, 9-a bolt fixing area and 10-a positioning base plate;
11-1-tensioning end anchor backing plate, 11-2-fixed end anchor backing plate, 11-3-intermediate anchor backing plate I, 11-4-intermediate anchor backing plate II, 12-tensioning backing plate, 13-1-carbon fiber plate anchor I, 13-2-carbon fiber plate anchor II, 13-3-carbon fiber plate anchor III, 13-4-carbon fiber plate anchor IV, 14-expansion bolt, 15-tensioning backing plate bolt, 16-bolt hole, 17-fixing bolt, 18-clamping bolt, 19-steel rod, 20-tensioning baffle plate, 21-connecting steel plate, 22-jack, 23-beam to be reinforced and 24-carbon fiber plate.
Detailed Description
In order that the invention may be further understood, the invention will now be described in detail with reference to specific examples.
The first embodiment is as follows:
as shown in fig. 1 to 4, an embodiment of the clamping type anchorage device for the inner curved surface of the carbon fiber plate according to the invention comprises an upper clamping plate 1 and a lower clamping plate 2, wherein the upper clamping plate 1 and the lower clamping plate 2 are fixedly connected through a bolt 3; the surface of the upper clamping plate 1 opposite to the surface of the lower clamping plate 2 is in an inner curved surface shape, a through hole 6 is formed between the inner curved surface 4 of the upper clamping plate and the inner curved surface 5 of the lower clamping plate, and a carbon fiber plate 7 is clamped in the through hole 6; the height of the through hole 6 is gradually increased from the middle position to the two ends along the longitudinal direction, and the height of the through hole 6 is increased to the end part of the through hole and is the same as the thickness of the clamped carbon fiber plate 7.
An inner curved surface clamping area 8 is arranged in the middle area of the upper clamping plate 1 and the lower clamping plate 2 along the longitudinal direction; the upper clamping plate 1 and the lower clamping plate 2 are provided with bolt fixing areas 9 along the longitudinal two side edge areas.
The inner curved surface clamping area of the upper clamping plate and the inner curved surface clamping area of the lower clamping plate are respectively provided with an inner curved surface. The intersection line of the inner curved surface of the upper clamping plate and the vertical longitudinal section of the anchorage device is an arc line, the arc line is formed by three points, and the three points are a point in the middle of the arc line and points at two ends of the arc line; the intersection line of the inner curved surface of the lower clamping plate and the vertical longitudinal section of the anchorage device is an arc line, the arc line is formed by three points, and the three points are a point in the middle of the arc line and points at two ends of the arc line.
And a layer of carbon fiber plate is clamped in the through hole, and the thickness of the carbon fiber plate is 2 cm. The length of the upper clamping plate and the lower clamping plate is 50 times of the thickness of the carbon fiber plate. The thickness of the upper clamping plate and the lower clamping plate along the longitudinal two ends is 2 cm. The difference between the thickness of the middle position of the upper clamping plate and the lower clamping plate along the longitudinal direction and the thickness of the two end positions is 10% of the thickness of the carbon fiber plate. The compression amount of the carbon fiber plate at the center of the through hole is 10%.
The bolt fixing area of the upper clamping plate and the bolt fixing area of the lower clamping plate are provided with a plurality of bolt holes. The bolt fixing areas on the two sides of the upper clamping plate are opposite to the bolt fixing areas on the two sides of the lower clamping plate respectively, and a positioning base plate 10 is arranged between the opposite upper and lower bolt fixing areas. The positioning base plate 10 is provided with bolt holes corresponding to the upper clamp plate 1 and the lower clamp plate 2. The positioning base plate 10 is made of a steel plate, and the thickness of the positioning base plate 10 is the same as that of the carbon fiber plate 7. And (3) performing rough treatment on the surface of the through hole, such as scoring, sand blasting and the like, and smearing epoxy resin glue after the rough treatment.
The carbon fiber plate inner curved surface clamping type anchorage device has the following beneficial effects:
(1) a through hole is formed between the inner curved surface of the upper clamping plate and the inner curved surface of the lower clamping plate, the middle position of the through hole is narrowest, the height of the through hole is gradually increased from the middle position to the two ends along the longitudinal direction, the height of the through hole is increased to the same as the thickness of the clamped carbon fiber plate, the extrusion force applied to the carbon fiber plate in the anchoring area is the largest at the middle position of the anchoring area, and is gradually reduced towards the two ends of the anchoring area, and the extrusion force at the loading end approaches zero; according to the distribution characteristics of the extrusion force in the anchoring area, the transverse shear stress borne by the carbon fiber plate is the largest at the end part of the anchorage device, and is gradually reduced to zero inwards, although the shear stress of the section of the loaded end is larger relative to the middle position of the anchoring area, in the range capable of being borne by the carbon fiber plate, compared with the shear stress concentration at the end part of the anchorage device in the prior art, the shear stress generated at the end part of the anchorage device is much smaller;
(2) the thickness of the positioning cushion plate is the same as that of the carbon fiber plate, the required through hole can be formed only by pressing the upper clamping plate and the lower clamping plate to be tightly attached to the positioning cushion plate, and the carbon fiber plate is clamped by the through hole, so that the operation is simple, and the force of the bolt does not need to be controlled and adjusted; if the through hole clamps the multiple layers of carbon fiber plates, the thickness of the positioning cushion plate is the same as the total thickness of the multiple layers of carbon fiber plates;
(3) in the range from the middle position of the through hole to the free end of the through hole, the carbon fiber plate is subjected to friction along the inner surfaces of the upper clamping plate and the lower clamping plate and resistance perpendicular to the inner surfaces, so that the carbon fiber plate is difficult to slide, and the stress characteristic can effectively avoid the sliding problem caused by stress relaxation; meanwhile, the extrusion force borne by the carbon fiber plate can be durable and effective within the range from the middle position of the through hole to the loading end; the front section and the rear section of the through hole work cooperatively, so that the carbon fiber plate is ensured to be in a long-term stable good stress state;
(4) when the carbon fiber plate inner curved surface clamping type anchorage device is used for reinforcing a concrete beam, a plurality of anchorage devices can be connected in series through the carbon fiber plates and are fixed at the bottom of the concrete beam, so that the overlarge tension borne by the carbon fiber plates is shared, and the problem of connection failure between the anchorage devices and the concrete due to overlarge tension is solved.
As shown in fig. 5 to 10, an embodiment of the method for reinforcing a beam by a prestressed carbon fiber plate according to the present invention comprises the following steps in the order named:
the method comprises the following steps: calculating the length of the carbon fiber plate for reinforcement according to the length of the beam to be reinforced, the material characteristics of the carbon fiber plate and the magnitude of the tension control stress, marking and intercepting;
step two: marking punching positions on the side surface of the beam 23 to be reinforced according to the design positions of the tensioning end anchor backing plate 11-1, the fixed end anchor backing plate 11-2, the middle anchor backing plate I11-3 and the middle anchor backing plate II 11-4, wherein the marked punching positions correspond to holes of expansion bolts 14 on the tensioning end anchor backing plate 11-1, the fixed end anchor backing plate 11-2, the middle anchor backing plate I11-3 and the middle anchor backing plate II 11-4, inserting an expansion pipe after drilling, and filling pasty resin adhesive into the holes;
step three: before the resin adhesive is not solidified, an expansion bolt 14 is screwed in, and a tensioning end anchor backing plate 11-1, a fixed end anchor backing plate 11-2, an intermediate anchor backing plate I11-3 and an intermediate anchor backing plate II 11-4 are fixed at designed positions;
step four: fixing a tensioning backing plate 12 on a tensioning end anchor backing plate 11-1 by using a tensioning backing plate bolt 15;
step five: one end of a carbon fiber plate 24 is anchored on the carbon fiber plate anchorage device I13-1 at the tensioning end by a clamping bolt 18, a steel rod 19 is bolted on a connecting steel plate 21, and the connecting steel plate 21 is bolted on one end of the carbon fiber plate anchorage device I13-1 at the tensioning end;
step six: clamping a carbon fiber plate 24 by using a carbon fiber plate anchorage device II 13-2, a carbon fiber plate anchorage device III 13-3 and a carbon fiber plate anchorage device IV 13-4, keeping the carbon fiber plate in a loose state, and then respectively connecting the carbon fiber plate 24 to the bottom surfaces of a fixed end anchor backing plate 11-2, an intermediate anchor backing plate I11-3 and an intermediate anchor backing plate II 11-4;
step seven: the steel rod 19 penetrates through a tensioning hole of a tensioning baffle 20, and then the carbon fiber plate anchorage device II 13-2 is clamped and fixed on the bottom surface of the fixed end anchor backing plate 11-2;
step eight: symmetrically tensioning the steel rods 19 by using a jack 22, clamping a carbon fiber plate anchorage device III 13-3 when the tensioning stress reaches 40% of the tensioning control stress, and fixing the carbon fiber plate anchorage device III at the bottom of the middle anchor backing plate I11-3; continuously stretching the steel rod 19, clamping the carbon fiber plate anchorage IV 13-4 when the stretching stress reaches 115% of the stretching control stress, and fixing the carbon fiber plate anchorage at the bottom of the middle anchor backing plate II 11-4; unloading the jack 22, and fixing the carbon fiber plate anchorage I13-1 at the bottom of the tensioning end anchor backing plate 11-1 through the fixing bolt 17 when the tensioning stress reaches the tensioning control stress; after the carbon fiber plate anchorage device III or the carbon fiber plate anchorage device IV is clamped and fixed, if the jack is about to reach the limit stroke, the jack is timely adjusted back to enable the initial stroke to be zero, and then tensioning is continued;
step nine: and (4) unloading the jack 22, and unloading the tensioning base plate 12 and the connecting steel plate 21 to finish the reinforcement of the beam 23 to be reinforced.
And in the fourth step, during tensioning, fixedly connecting the tensioning backing plate with the tensioning end anchor backing plate by using a tensioning backing plate bolt, and after tensioning is finished, dismounting the tensioning backing plate bolt to separate the tensioning backing plate from the tensioning end anchor backing plate. In the eighth step, symmetrically tensioning the steel rod by using jacks, namely simultaneously tensioning all the jacks to avoid tension eccentricity; when the jack is unloaded, the carbon fiber plate anchorage device I cannot be completely unloaded, and when the tension stress is unloaded to reach the tension control stress, the carbon fiber plate anchorage device I is fixed at the bottom of the tension end anchorage backing plate through the fixing bolt. Bolt holes 16 are arranged at the bottom of the tensioning cushion plate 12. Carbon fiber board ground tackle I, carbon fiber board ground tackle II, carbon fiber board ground tackle III, carbon fiber board ground tackle IV have the same structure, and this structure is the carbon fiber board inner curved surface centre gripping formula ground tackle of this embodiment.
The method for reinforcing the beam by the prestressed carbon fiber plate comprises the steps of sequentially connecting a plurality of carbon fiber plate inner curved surface clamping type anchorage devices in series by stretching the carbon fiber plate in a grading manner, fixing the carbon fiber plate inner curved surface clamping type anchorage devices to anchor backing plates wrapping the bottom of the beam, fixing the anchor backing plates on the side surface of the beam by using bolts, and fixing a set of carbon fiber plate inner curved surface clamping type anchorage devices at the bottom of each anchor backing plate. The carbon fiber plate anchor devices are sequentially screwed through tensioning the carbon fiber plates in a grading manner, so that each anchor device shares a part of pulling force, the defects that the pulling force is too large at an anchoring point and the anchor point is easy to damage and fail due to the fact that only the anchors at two ends bear the pulling force are avoided, and the method can be used for reinforcing a long-span bridge. The anchor backing plate is fixed on the side face through the bolt, so that the problem that drilling is difficult due to the fact that bottom stressed steel bars are dense when the beam bottom is fixed is solved. The bending moment generated by the anchor backing plate under the action of the tensile force of the bottom carbon fiber plate is beneficial to offsetting the bending moment generated by external load on the beam, and the prestress efficiency is improved. The method utilizes the prestressed series anchorage device, is suitable for reinforcing long-span bridges, and adopts reliable anchoring measures to ensure that the prestress is effective for a long time.
Example two:
according to another embodiment of the carbon fiber plate inner curved surface clamping type anchorage device, the structure, the connection relation among all parts, the working principle, the method for reinforcing the beam, the beneficial effects and the like are the same as those of the first embodiment, and the difference is that: the length of the upper clamping plate and the lower clamping plate is 55 times of the thickness of the carbon fiber plate; the thickness of the upper clamping plate and the lower clamping plate at the two ends along the longitudinal direction is 4 cm; the difference between the thickness of the middle position of the upper clamping plate and the lower clamping plate along the longitudinal direction and the thickness of the two end positions is 11% of the thickness of the carbon fiber plate; the compression amount of the carbon fiber plate at the center of the through hole is 11%.
Example three:
according to another embodiment of the carbon fiber plate inner curved surface clamping type anchorage device, the structure, the connection relation among all parts, the working principle, the method for reinforcing the beam, the beneficial effects and the like are the same as those of the first embodiment, and the difference is that: the length of the upper clamping plate and the lower clamping plate is 60 times of the thickness of the carbon fiber plate; the thickness of the upper clamping plate and the lower clamping plate at the two ends along the longitudinal direction is 5 cm; the difference between the thickness of the middle position of the upper clamping plate and the lower clamping plate along the longitudinal direction and the thickness of the two end positions is 12% of the thickness of the carbon fiber plate; the compression amount of the carbon fiber plate at the center of the through hole is 12%.
Example four:
according to another embodiment of the carbon fiber plate inner curved surface clamping type anchorage device, the structure, the connection relation among all parts, the working principle, the method for reinforcing the beam, the beneficial effects and the like are the same as those of the first embodiment, and the difference is that: and two layers of carbon fiber plates are clamped in the through holes, and the total thickness of the two layers of carbon fiber plates is 2 cm. The length of the upper clamping plate and the lower clamping plate is 50 times of the total thickness of the carbon fiber plate; the thickness of the upper clamping plate and the lower clamping plate at the two ends along the longitudinal direction is 2 cm; the difference between the thickness of the middle position of the upper clamping plate and the lower clamping plate along the longitudinal direction and the thickness of the two end positions is 13% of the total thickness of the carbon fiber plate; the compression amount of the carbon fiber plate at the center of the through hole is 13%.
Example five:
according to another embodiment of the carbon fiber plate inner curved surface clamping type anchorage device, the structure, the connection relation among all parts, the working principle, the method for reinforcing the beam, the beneficial effects and the like are the same as those of the fourth embodiment, and the difference is that: three layers of carbon fiber plates are clamped in the through holes, and the total thickness of the three layers of carbon fiber plates is 2 cm. The length of the upper clamping plate and the lower clamping plate is 55 times of the total thickness of the carbon fiber plate; the thickness of the upper clamping plate and the lower clamping plate at the two ends along the longitudinal direction is 3.5 cm; the difference between the thickness of the middle position of the upper clamping plate and the lower clamping plate along the longitudinal direction and the thickness of the two end positions is 14% of the total thickness of the carbon fiber plate; the compression amount of the carbon fiber plate at the center of the through hole is 14%.
Example six:
according to another embodiment of the carbon fiber plate inner curved surface clamping type anchorage device, the structure, the connection relation among all parts, the working principle, the method for reinforcing the beam, the beneficial effects and the like are the same as those of the first embodiment, and the difference is that: four layers of carbon fiber plates are clamped in the through holes, and the total thickness of the four layers of carbon fiber plates is 2 cm. The length of the upper clamping plate and the lower clamping plate is 60 times of the total thickness of the carbon fiber plate; the thickness of the upper clamping plate and the lower clamping plate at the two ends along the longitudinal direction is 5 cm; the difference between the thickness of the middle position of the upper clamping plate and the lower clamping plate along the longitudinal direction and the thickness of the two end positions is 15% of the total thickness of the carbon fiber plate; the compression amount of the carbon fiber plate at the center of the through hole is 15%.
It will be appreciated by those skilled in the art that any combination of the inventive aspects and embodiments of the carbon fiber panel cambergrip anchor of the present invention, including the inventive aspects and embodiments of the present description and illustrated in the accompanying drawings, is not intended to be limited to the details and to provide a concise description without departing from the spirit and scope of the claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. The utility model provides a carbon fiber plate inner curved surface centre gripping formula ground tackle, includes punch holder and lower plate, the punch holder with pass through bolt fixed connection between the lower plate, its characterized in that: the surface of the upper clamping plate, which is opposite to the lower clamping plate, is in the shape of an inner curved surface, a through hole is formed between the inner curved surface of the upper clamping plate and the inner curved surface of the lower clamping plate, and a carbon fiber plate is clamped in the through hole; the height of the through hole is gradually increased from the middle position to the two ends of the through hole along the longitudinal direction, the height of the through hole is increased to the same as the thickness of the clamped carbon fiber plate, and an inner curved surface clamping area is arranged in the middle area of the upper clamping plate and the lower clamping plate along the longitudinal direction; the upper plate with lower plate sets up the bolt fastening district along fore-and-aft both sides limit portion region, the bolt fastening district of upper plate with the bolt fastening district of lower plate sets up a plurality of bolt hole, the bolt fastening district of upper plate both sides with the bolt fastening district of lower plate both sides is relative respectively, and sets up the location backing plate between the relative upper and lower bolt fastening district.
2. The carbon fiber plate inner curved surface clamping type anchorage device as claimed in claim 1, wherein: the inner curved surface clamping area of the upper clamping plate and the inner curved surface clamping area of the lower clamping plate are respectively provided with an inner curved surface.
3. The carbon fiber plate inner curved surface clamping type anchorage device as claimed in claim 2, wherein: the intersection line of the inner curved surface of the upper clamping plate and the vertical longitudinal section of the anchorage device is an arc line, the arc line is formed by three points, and the three points are a point in the middle of the arc line and points at two ends of the arc line.
4. The carbon fiber plate inner curved surface clamping type anchorage device as claimed in claim 2, wherein: the intersection line of the inner curved surface of the lower clamping plate and the vertical longitudinal section of the anchorage device is an arc line, the arc line is formed by three points, and the three points are a point in the middle of the arc line and points at two ends of the arc line.
5. The carbon fiber plate inner curved surface clamping type anchorage device as claimed in claim 1, wherein: a plurality of layers of carbon fiber plates can be clamped in the through holes, and the total thickness of the carbon fiber plates is not more than 2 cm.
6. The carbon fiber plate inner curved surface clamping type anchorage device as claimed in claim 5, wherein: the length of the upper clamping plate and the lower clamping plate is 50-60 times of the total thickness of the carbon fiber plate.
7. The carbon fiber plate inner curved surface clamping type anchorage device as claimed in claim 6, wherein: the thickness of the upper clamping plate and the lower clamping plate at the two longitudinal ends is 2-5 cm.
8. The carbon fiber plate inner curved surface clamping type anchorage device as claimed in claim 7, wherein: the difference between the thickness of the middle position and the thickness of the two end positions of the upper clamping plate and the lower clamping plate along the longitudinal direction is 10-15% of the total thickness of the carbon fiber plate.
9. The carbon fiber plate inner curved surface clamping type anchorage device as claimed in claim 8, wherein: the compression amount of the carbon fiber plate at the center of the through hole is 10-15%.
10. The carbon fiber plate inner curved surface clamping type anchorage device as claimed in claim 1, wherein: the positioning base plate is provided with bolt holes corresponding to the upper clamping plate and the lower clamping plate.
11. The carbon fiber plate inner curved surface clamping type anchorage device as claimed in claim 10, wherein: the positioning base plate is made of a steel plate, and the thickness of the positioning base plate is equal to the total thickness of the carbon fiber plate.
12. The carbon fiber plate inner curved surface clamping type anchorage device as claimed in claim 1, wherein: and performing rough treatment on the surface of the through hole, and then coating epoxy resin glue after the rough treatment.
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| CN201810653356.3A CN108843040B (en) | 2018-06-22 | 2018-06-22 | Carbon fiber plate inner curved surface clamping type anchorage device |
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| CN110145072A (en) * | 2019-01-23 | 2019-08-20 | 卡本科技股份有限公司 | A kind of assembled anchorage and operating method |
| CN115478707B (en) * | 2022-09-30 | 2023-06-16 | 中国人民解放军陆军工程大学 | High-bearing extrusion type anchorage device suitable for multi-layer carbon fiber plate cables and application method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322152A (en) * | 2011-09-29 | 2012-01-18 | 重庆大学 | Prestressed carbon fiber board tensioning system and tension reinforcing method |
| CN103075014A (en) * | 2013-02-06 | 2013-05-01 | 全恩懋 | Tensional anchoring system for secondary clamping of prestressed sheets |
| CN104141363A (en) * | 2014-06-04 | 2014-11-12 | 兰州铁信土建新技术有限公司 | Rear combined clamping type prestress anchor |
| CN205189428U (en) * | 2015-12-11 | 2016-04-27 | 招商局重庆交通科研设计院有限公司 | Push -pull system is opened to bent panel mount carbon fiber plate ground tackle |
| CN105781123A (en) * | 2016-05-06 | 2016-07-20 | 西南交通大学 | Mechanical gripping anchor for carbon fiber plate and reinforcing device |
| CN205421954U (en) * | 2016-03-30 | 2016-08-03 | 陕西通宇新材料有限公司 | Multi coated carbon fiber sheet stretch -draw anchor |
-
2018
- 2018-06-22 CN CN201810653356.3A patent/CN108843040B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322152A (en) * | 2011-09-29 | 2012-01-18 | 重庆大学 | Prestressed carbon fiber board tensioning system and tension reinforcing method |
| CN103075014A (en) * | 2013-02-06 | 2013-05-01 | 全恩懋 | Tensional anchoring system for secondary clamping of prestressed sheets |
| CN104141363A (en) * | 2014-06-04 | 2014-11-12 | 兰州铁信土建新技术有限公司 | Rear combined clamping type prestress anchor |
| CN205189428U (en) * | 2015-12-11 | 2016-04-27 | 招商局重庆交通科研设计院有限公司 | Push -pull system is opened to bent panel mount carbon fiber plate ground tackle |
| CN205421954U (en) * | 2016-03-30 | 2016-08-03 | 陕西通宇新材料有限公司 | Multi coated carbon fiber sheet stretch -draw anchor |
| CN105781123A (en) * | 2016-05-06 | 2016-07-20 | 西南交通大学 | Mechanical gripping anchor for carbon fiber plate and reinforcing device |
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