CN114892549B - Expansion filling type external prestress CFRP material reinforcing system and construction method thereof - Google Patents
Expansion filling type external prestress CFRP material reinforcing system and construction method thereof Download PDFInfo
- Publication number
- CN114892549B CN114892549B CN202210569407.0A CN202210569407A CN114892549B CN 114892549 B CN114892549 B CN 114892549B CN 202210569407 A CN202210569407 A CN 202210569407A CN 114892549 B CN114892549 B CN 114892549B
- Authority
- CN
- China
- Prior art keywords
- cfrp
- reinforcement
- structural member
- prestress
- anchor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000004918 carbon fiber reinforced polymer Substances 0.000 title claims abstract description 127
- 238000010276 construction Methods 0.000 title claims abstract description 43
- 239000000463 material Substances 0.000 title claims abstract description 31
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims abstract description 96
- 230000002787 reinforcement Effects 0.000 claims abstract description 76
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000000338 in vitro Methods 0.000 claims abstract description 5
- 238000004873 anchoring Methods 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 7
- 230000002829 reductive effect Effects 0.000 abstract description 6
- 230000035882 stress Effects 0.000 description 14
- 239000012779 reinforcing material Substances 0.000 description 8
- 238000005452 bending Methods 0.000 description 7
- 230000001360 synchronised effect Effects 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004643 material aging Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses an expansion filling type in-vitro prestress CFRP material reinforcing system and a construction method thereof, wherein the expansion filling type in-vitro prestress CFRP material reinforcing system comprises a structural member to be reinforced and a CFRP reinforcing member, two ends of the CFRP reinforcing member are respectively connected with the structural member to be reinforced through end fixing mechanisms, at least one supporting mechanism is arranged on the structural member to be reinforced, a backing plate and a steering block are arranged between the supporting mechanism and the CFRP reinforcing member, and a prestress adjusting mechanism is detachably arranged on the supporting mechanism. The effect is as follows: according to the invention, only one section of CFRP reinforcement is utilized to realize external prestress reinforcement, so that only a fixing mechanism is arranged at the end part of one section of CFRP reinforcement, the number of anchors required by construction is greatly reduced, the process of tensioning the CFRP reinforcement is simplified, the construction cost is reduced, and the construction efficiency is improved.
Description
Technical Field
The invention relates to the technical field of external prestressing force application in civil engineering, in particular to an expansion filling type external prestressing force CFRP material reinforcing system and a construction method thereof.
Background
The concrete structural member or the steel structural member in engineering structures of modern buildings, traffic, bridges and the like has huge potential safety hazards due to the conditions of insufficient bearing capacity or cracking and the like caused by environmental corrosion, material aging, change of structural functions and the like or natural disasters.
The existing reinforcement methods for engineering components are divided into two major categories from the principle of action, namely a passive reinforcement method and an active reinforcement method. Passive reinforcement refers to directly adding tensile (or shear) reinforcing materials in the tensile (or shear) weak area of a member, for example: and (3) sticking a steel plate, sticking a high-strength fiber composite material (carbon fiber and aramid fiber) and the like. The reinforcing material only bears the internal force caused by the live load and the post-load, and compared with the original stressed member, the strain (stress) of the reinforcing material is relatively lagged. In particular, the scheme of directly sticking high-strength fiber composite materials is adopted, so that the high tensile property of the reinforcing material is difficult to play a role. Therefore, the passive reinforcement method cannot reduce the deformation of the original structure and cannot close the crack. Active reinforcement refers to the application of a pre-stress to a reinforcing material disposed in a region of tension (or shear) weakness of a member. The reinforcing material is actively stressed, so that the problem of strain (stress) hysteresis of the post-reinforcing material is fundamentally solved, the high tensile property of the reinforcing material can be fully exerted, the utilization efficiency of the material is improved, and the bending-resistant bearing capacity and the normal working performance of the reinforced member are both obviously improved.
The Chinese patent invention ZL201711297399.4 discloses a CFRP plate multipoint support prestress reinforcement structure component and a prestress application method thereof, wherein the structure component comprises: the structural member is a metal structural member suitable for bearing load; the CFRP plate is arranged on the structural member and is provided with at least two connecting points connected to the structural member; the supporting device is arranged on the structural member and located between the two connecting points, the supporting device comprises an adjusting screw and a supporting piece, the adjusting screw is rotatably arranged on the structural member, the supporting piece is in threaded fit with the adjusting screw, the distance between the supporting piece and the structural member is adjustable when the adjusting screw rotates, the supporting piece is supported on the CFRP plate, and the supporting piece can jack up the CFRP plate to deform towards a direction away from the structural member when the distance between the supporting piece and the structural member is increased.
The above-described structural assembly has the following drawbacks during the prestressing process:
(1) The screw belongs to an elongated member, the screw is easy to be pressed and unstably pressed in the jacking process, and the construction is dangerous;
(2) When the multipoint support is formed, a plurality of screws are required to lift up simultaneously, the synchronous lifting uniformity is difficult to ensure by manual operation, and the carbon fiber plate is easy to be stressed unevenly;
(3) The screw jacking force is very limited, large tonnage cannot be realized, and engineering application scenes are limited;
(4) The end part adopts a flat plate clamping mode, so that the anchoring efficiency is low, and the prestress loss is larger;
(5) The support rod is screwed by bolts, so that the prestress loss is large, and the construction is difficult;
(6) The lack of steering measures at the end portions can easily bend or twist the CFRP plate, so that the CFRP plate is damaged or even broken.
In view of this, chinese patent No. ZL201911310457.1 discloses a reinforced mounting system for a combined beam string of CFRP sheet material, which comprises a beam body, n+1 CFRP sheets, n fixing brackets and 2n+2 anchors, n is a positive integer greater than or equal to 1, the beam body is horizontally arranged, the fixing brackets are arranged on the lower surface of the beam body, two anchors are hinged to the lower end of the fixing brackets, two hinge seats are further arranged at two ends of the lower surface of the beam body, the fixing brackets are positioned between the two hinge seats, two hinge seats are respectively hinged with one anchor, a CFRP sheet is arranged between each hinge seat and the adjacent fixing bracket, a CFRP sheet is also arranged between the adjacent two fixing brackets, and two ends of the CFRP sheet are clamped on the corresponding anchors. According to the CFRP sheet stretching device, the vertical load is dispersed through the support, so that the local stress of a structural part is relieved, the stress is relatively dispersed in the CFRP sheet stretching process by utilizing the hinge seat, the CFRP sheet is prevented from being sheared and damaged, and the CFRP sheet is guaranteed to be uniformly stressed.
However, the CFRP sheet in the above system adopts a segmented anchoring method, and the following problems still exist in construction:
(1) The CFRP sheet is divided into a plurality of sections, each section needs 2 anchors, and the number of the anchors is large, the operation is complex and the cost is high;
(2) The CFRP sheets are arranged in a segmented mode, prestress tensioning is needed to be carried out on each segment, construction steps are multiple and complex, and prestress is difficult to keep consistent;
(3) By adopting sectional type, each section has prestress loss, and the nodes are not regulated;
(4) If CFRP sheet prestress tensioning of adjacent segments is not synchronous, unbalanced force is generated on the fixing bracket, and adverse effects may be caused. If synchronous tensioning is adopted, all the segments need to be synchronously tensioned, so that the construction is difficult and the application is difficult.
Disclosure of Invention
The invention aims to provide an expanded packing type external prestress CFRP material reinforcing system, which only adopts a section of continuous CFRP reinforcement to realize reinforcement, so that a fixing mechanism is only required to be arranged at the end part of a section of CFRP reinforcement, and only a section of CFRP reinforcement is required to be tensioned when prestress is applied, thereby greatly reducing the number of anchorage devices required by construction, reducing the tensioning difficulty and being beneficial to improving the construction efficiency; another object of the present invention is to provide a construction method of a reinforcement system based on the aforementioned expanded-stuffing-type in vitro prestressed CFRP material.
In order to achieve the above purpose, the present invention firstly provides an expanding packing type external prestress CFRP material reinforcement system, which comprises a structural member to be reinforced and a CFRP reinforcement, wherein the key point is that both ends of the CFRP reinforcement are respectively connected with the structural member to be reinforced through end fixing mechanisms, at least one supporting mechanism is arranged on the structural member to be reinforced, a backing plate and a steering block are arranged between the supporting mechanism and the CFRP reinforcement, and a prestress adjusting mechanism is also detachably arranged on the supporting mechanism.
Still further, prestressing force adjustment mechanism includes U type and prop, jack and traction screw, U type prop with supporting mechanism detachable connection just the backing plate the turning to the piece with CFRP reinforcement is located between the linking arm that U type propped, traction screw with turn to the piece detachable connection, the jack is connected U type prop with traction screw between, and pass through the jack drives traction screw adjusts the height that turns to the piece.
Still further, the traction screw is provided with two at least, offer on the bottom plate of U type props and be used for the interlude the via hole of traction screw the fixed counter-force board that is provided with between the traction screw, the jack butt is in between counter-force board and the bottom plate of U type props.
Still further, the supporting mechanism includes base and at least one spinal branch vaulting pole the upper end of bracing piece is fixed through the connecting plate wait to consolidate on the structure spare, the lower extreme of bracing piece with the base is connected detachably connect on the base prestressing force adjustment mechanism.
Still further, the end fixing mechanism includes an anchor seat and an anchor for anchoring the CFRP reinforcement, the anchor being rotatably connected with the anchor seat.
Still further, the CFRP reinforcement is one or a combination of more of CFRP plates, CFRP cables or CFRP grids, and the anchor is any one of a flat plate anchor, a wedge anchor or a wave anchor.
Further, the CFRP reinforcement is formed by overlapping a plurality of CFRP plates, and the anchor is correspondingly provided with anchor interfaces of the CFRP plates.
Based on the structure described above, the invention also provides a construction method, which is characterized by comprising the following steps:
s1: two ends of the CFRP reinforcement are respectively arranged on the structural member to be reinforced through end fixing mechanisms;
s2: a supporting mechanism is arranged between the two end fixing mechanisms at a preset interval;
S3: placing the CFRP reinforcement in a prestress adjusting mechanism and connecting the steering block with the prestress adjusting mechanism;
S4: the prestress adjusting mechanism is arranged on the supporting mechanism, and the height of the steering block is adjusted through the prestress adjusting mechanism;
s5: filling a backing plate in a gap between the steering block and the supporting mechanism;
s6: and (5) dismantling the prestress adjusting mechanism.
Further, before filling the pad plates in step S5, adhesive glue is applied to the upper and lower surfaces of each pad plate.
Further, the structural member to be reinforced is any one of a metal structural member, a concrete structural member, a wood structural member or a combined structural member.
Compared with the prior art, the invention has the remarkable effects that:
1. According to the invention, only one section of CFRP reinforcement is utilized to realize external prestress reinforcement, so that only a fixing mechanism is arranged at the end part of one section of CFRP reinforcement, the number of anchorage devices required by construction is greatly reduced, the process of tensioning the CFRP reinforcement is simplified, the construction cost is reduced, and the construction efficiency is improved;
2. in the prestress application process, the steering block can limit the CFRP reinforcement to bend in a certain curvature radius, so that the CFRP reinforcement is prevented from being damaged or even broken due to excessive bending;
3. The prestress is transversely applied through the prestress adjusting mechanism taking the jack as main equipment, so that on one hand, large-tonnage construction can be realized, on the other hand, the construction speed is high, time and labor are saved, and the construction efficiency is high;
4. The prestress is transversely applied through the prestress adjusting mechanism, on one hand, after the CFRP reinforcement is tensioned to the target prestress by the prestress adjusting mechanism, the prestress loss can be avoided through filling the backing plates with different sizes, and the construction is more convenient; on the other hand, the prestress adjusting mechanism can be easily disassembled after the cushion plate is filled, so that the construction cost is further reduced;
5. After the prestressing force is applied, the oblique downward pulling force acting on the two ends of the structural member to be reinforced through the end fixing mechanism provides the negative bending moment for resisting the load and the axial pressure for inhibiting the crack, and meanwhile, the jacking force vertically transmitted by the stay bar plays a role in elastic support, so that the technical problem of mid-span downwarping of the structural member to be reinforced is solved pertinently;
6. the anchor device can adaptively adjust the included angle of the CFRP reinforcement material relative to the structural member to be reinforced in the process of applying prestress to the CFRP reinforcement material so as to effectively concentrate longitudinal stress caused by bending of the CFRP reinforcement relative to the anchor device and eliminate the notch effect of the end part of the CFRP reinforcement, thereby avoiding the end part damage of the CFRP reinforcement and being more suitable for large-tonnage structure construction; meanwhile, when aiming at large tonnage construction, the CFRP reinforcement can be formed by compounding a plurality of layers of CFRP plates, and the reinforcement effect can be greatly improved by matching with corresponding anchors;
7. The anchor can be replaced freely according to the actual condition of the structural member to be reinforced, the reinforcing form of the CFRP material, the prestress application and other factors, so that the universality of the end fixing mechanism is improved, and the application range is wider;
8. the supporting rods are fixedly connected with the structural member to be reinforced through the connecting plates, so that the stress area of the structural member to be reinforced can be increased, vertical loads are dispersed, and deformation or damage of the structural member to be reinforced and/or the supporting mechanism caused by improper local stress is avoided.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the structure of a reinforcement system according to the first embodiment after the prestress adjusting mechanism is removed;
FIG. 2 is a schematic view showing the structure of the reinforcing system in a tensioned state in the first embodiment;
Fig. 3 is a partial enlarged view of a portion a in fig. 2;
Fig. 4 is a partial enlarged view of a portion B in fig. 2;
FIG. 5 is a flow chart of the construction method in the first embodiment;
1-structural member to be reinforced, 2-CFRP reinforcement, 3-end fixing mechanism, 4-supporting mechanism, 5-backing plate, 6-steering block, 7-prestress adjusting mechanism, 71-U-shaped support, 72-jack, 73-traction screw, 74-counter force plate, 41-base, 42-supporting rod, 31-anchor seat and 32-anchor.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, in the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Fig. 1 to 4 show a first embodiment of the present invention: the utility model provides an external prestressing force CFRP material reinforcement system of expansion packing formula, includes wait to consolidate structural component 1 and CFRP reinforcement 2, CFRP reinforcement 2 both ends respectively through tip fixed establishment 3 with wait to consolidate structural component 1 to be provided with at least one supporting mechanism 4 on waiting to consolidate structural component 1 supporting mechanism 4 with be provided with backing plate 5 and steering block 6 between the CFRP reinforcement 2, still detachable is provided with prestressing force adjustment mechanism 7 on the supporting mechanism 4.
Referring to fig. 2 and 3, in the embodiment, the prestress adjusting mechanism 7 includes a U-shaped support 71, a jack 72 and a traction screw 73, the U-shaped support 71 is detachably connected with the support mechanism 4, the backing plate 5, the steering block 6 and the CFRP reinforcement 2 are located between the connecting arms of the U-shaped support 71, the traction screw 73 is detachably connected with the steering block 6, the jack 72 is connected between the U-shaped support 71 and the traction screw 73, and the jack 72 drives the traction screw 73 to adjust the height of the steering block 6.
In the present embodiment, in order to effectively limit the pulling direction of the steering block 6, at least two of the traction screws 73 are provided, a through hole for inserting the traction screws 73 is formed in the bottom plate of the U-shaped stay 71, a reaction plate 74 is fixedly provided between the traction screws 73, and the jack 72 is abutted between the reaction plate 74 and the bottom plate of the U-shaped stay 71.
As can be seen from fig. 3, in order to disperse the load applied to the supporting mechanism 4 when the supporting mechanism is abutted against the structural member 1 to be reinforced, the supporting mechanism 4 comprises a base 41 and at least one supporting rod 42, the lower end of the supporting rod 42 is connected with the base 41, the upper end of the supporting rod 42 is fixed on the structural member 1 to be reinforced through a connecting plate, and the prestress adjusting mechanism 7 is detachably connected on the base 41. Preferably, four support rods 42 are provided, the upper ends of the four support rods 42 are respectively connected with the structural member 1 to be reinforced through a connecting plate, and the lower ends of the four support rods 42 are connected to the base 41 in a folding manner.
As shown in fig. 4, in order to adapt the anchor 32 to its pitch angle during tensioning, the end fixing means 3 comprises an anchor mount 31 and an anchor 32 for anchoring the CFRP reinforcement 2, the anchor 32 being rotatably connected to the anchor mount 31.
In this embodiment, the anchor 32 is any one of a flat anchor, a wedge anchor, or a wave anchor. The anchoring form may take the form of one or more of adhesive, clip or friction anchors. Preferably, in order to meet the construction requirement of the large tonnage structure, the CFRP reinforcement 2 is formed by stacking multiple layers of CFRP plates, and the anchor 32 is correspondingly provided with an anchor interface of the multiple layers of CFRP plates. It will be appreciated that, in practical applications, the CFRP reinforcement 2 may be one or more combinations of CFRP plates, CFRP cables or CFRP grids, such as a CFRP plate-CFRP grid composite, multiple CFRP cable windings, multiple layers of CFRP plates, etc., in order to meet different construction requirements.
Referring to fig. 5, based on the above-described structure, the present embodiment further provides a construction method, which includes the following steps:
s1: two ends of the CFRP reinforcement 2 are respectively arranged on the structural member 1 to be reinforced through end fixing mechanisms 3;
s2: a supporting mechanism 4 is arranged between the two end fixing mechanisms 3 at a predetermined interval;
S3: placing the CFRP reinforcement 2 in the prestressing adjustment mechanism 7 and connecting the steering block 6 and the prestressing adjustment mechanism 7;
S4: the prestress adjusting mechanism 7 is arranged on the supporting mechanism 4, and the height of the steering block 6 is adjusted through the prestress adjusting mechanism 7;
S5: filling a gap between the steering block 6 and the supporting mechanism 4 with a backing plate 5;
S6: the prestressing force adjustment mechanism 7 is removed.
In the specific implementation, in order to improve the stability of the system, before the cushion plates 5 are filled in step S4, adhesive glue is smeared on the upper and lower surfaces of each cushion plate 5. Preferably, an adhesive is applied between the CFRP and the diverter block.
It will be appreciated that the structural member 1 to be reinforced is any one of a metal structural member, a concrete structural member, a wood structural member or a composite structural member adapted to bear load.
It should be noted that the initial length, tensile control stress, and elastic modulus of the CFRP material, as well as the support mechanism height and the horizontal distance of the end fixing mechanism to the support mechanism can be measured by the instrument during construction. Knowing the initial length, tensile control stress and modulus of elasticity of the CFRP material, as well as the support mechanism height and the horizontal distance of the end fixing mechanism to the support mechanism, the total thickness of the required packing pad can be calculated according to the following formula. ( This example is typical of two support mechanisms, other examples being: single support mechanism, more than two support mechanisms, parabolic ropes, etc., and the like )
Wherein: t-total thickness of the filling backing plate;
l—initial length of CFRP material;
h, the height of the supporting mechanism;
s-horizontal distance from the end fixing mechanism to the supporting mechanism;
sigma-CFRP material tension control stress;
Alpha 1、α2 -stretching the included angle between the front and rear CFRP materials and the beam bottom;
E-elastic modulus of CFRP material;
epsilon-strain value of CFRP material.
In summary, in the invention, only one section of CFRP reinforcement 2 is used to realize external prestress reinforcement, so that only a fixing mechanism is needed to be arranged at the end part of one section of CFRP reinforcement 2, thereby greatly reducing the number of anchors 32 required for construction, facilitating the simplification of the process of tensioning the CFRP reinforcement 2, reducing the construction cost and improving the construction efficiency; in the prestressing process, the steering block 6 can limit the CFRP reinforcement 2 to bend in a certain curvature radius, so that the CFRP reinforcement 2 is prevented from being damaged or even broken due to excessive bending; the prestress is transversely applied through the prestress adjusting mechanism 7 taking the jack 72 as main equipment, so that on one hand, large-tonnage construction can be realized, on the other hand, the construction speed is high, time and labor are saved, and the construction efficiency is high; the prestress is transversely applied through the detachably arranged prestress adjusting mechanism 7, so that on one hand, the clear space around the structural member 1 to be reinforced can be fully utilized, and the prestress application is more efficient; the other side prestress adjusting mechanism 7 can avoid prestress loss by filling the cushion plates 5 with different sizes after tensioning the CFRP reinforcement 2 to target prestress, so that construction is more convenient; meanwhile, the prestress adjusting mechanism 7 can be easily detached after the cushion plate 5 is filled, so that the construction cost is further reduced; after the prestressing force is applied, the oblique downward pulling force acting on the two ends of the structural member 1 to be reinforced through the end fixing mechanism 3 provides a negative bending moment for resisting load and axial pressure for inhibiting cracks, and meanwhile, the jacking force vertically transmitted by the stay bar plays a role in elastic support, so that the technical problem of mid-span downward deflection of the structural member 1 to be reinforced is solved pertinently; the anchor 32 can adaptively adjust the included angle of the CFRP reinforcement material relative to the structural member 1 to be reinforced in the process of applying prestress to the CFRP reinforcement material so as to effectively concentrate longitudinal stress caused by bending of the CFRP reinforcement 2 relative to the anchor 32 and eliminate the notch effect of the end part of the CFRP reinforcement 2, thereby avoiding the end part damage of the CFRP reinforcement 2 and being more suitable for large-tonnage structure construction; meanwhile, when aiming at large tonnage construction, the CFRP reinforcement 2 can be formed by compounding a plurality of layers of CFRP plates, and the matched corresponding anchorage 32 can greatly improve the reinforcement effect; the anchor 32 can be freely replaced according to the actual condition of the structural member 1 to be reinforced, the reinforcing form of the CFRP material, the prestress application and other factors, so that the universality of the end fixing mechanism 3 is improved, and the application range is wider; the supporting rod 42 is fixedly connected with the structural member 1 to be reinforced through the connecting plate, so that the stress area of the structural member 1 to be reinforced can be increased, and the vertical load is dispersed, so that the deformation or damage of the structural member 1 to be reinforced and/or the supporting mechanism 4 caused by improper local stress is avoided.
The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.
Claims (9)
1. The expanding packing type in-vitro prestress CFRP material reinforcing system comprises a structural member to be reinforced and a CFRP reinforcing member, and is characterized in that two ends of the CFRP reinforcing member are respectively connected with the structural member to be reinforced through end fixing mechanisms, at least one supporting mechanism is arranged on the structural member to be reinforced, a backing plate and a steering block are arranged between the supporting mechanism and the CFRP reinforcing member, and a prestress adjusting mechanism is also detachably arranged on the supporting mechanism;
The prestress adjusting mechanism comprises a U-shaped support, a jack and a traction screw, wherein the U-shaped support is detachably connected with the supporting mechanism, the base plate, the steering block and the CFRP reinforcement are located between connecting arms of the U-shaped support, the traction screw is detachably connected with the steering block, the jack is connected between the U-shaped support and the traction screw, and the height of the steering block is adjusted by the traction screw driven by the jack.
2. The expanded filled-type in-vitro prestressed CFRP material reinforcing system according to claim 1, wherein at least two traction screws are arranged, through holes for penetrating the traction screws are formed in the bottom plate of the U-shaped support, a counter-force plate is arranged between the traction screws, and the jack is abutted between the counter-force plate and the bottom plate of the U-shaped support.
3. The expanded filled ex-vivo prestressed CFRP material reinforcement system of claim 1 or 2 wherein said support means comprises a base and at least one support bar, the upper end of said support bar being secured to said structural member to be reinforced by a connecting plate, the lower end of said support bar being connected to said base, said prestressing means being removably connected to said base.
4. The expanded filled ex-vivo prestressed CFRP material reinforcement system of claim 1 wherein said end-securing means includes an anchor mount and an anchor for anchoring said CFRP reinforcement, said anchor being rotatably connected to said anchor mount.
5. The expanded filled ex-vivo prestressed CFRP material reinforcement system of claim 4 wherein said CFRP reinforcement is one or a combination of more of CFRP plates, CFRP cables or CFRP mesh and said anchor is any one of a flat plate anchor, a wedge anchor or a wave anchor.
6. The expanded-packed extracorporeal prestressed CFRP material reinforcement system of claim 4, wherein said CFRP reinforcement is formed by laminating a plurality of CFRP plates, and wherein said anchor is provided with anchor joints of the plurality of CFRP plates.
7. The construction method of the expanded filled extra-corporeal prestressed CFRP material reinforcing system of any one of claims 1-6, including the steps of:
s1: two ends of the CFRP reinforcement are respectively arranged on the structural member to be reinforced through end fixing mechanisms;
s2: a supporting mechanism is arranged between the two end fixing mechanisms at a preset interval;
S3: placing the CFRP reinforcement in a prestress adjusting mechanism and connecting the steering block with the prestress adjusting mechanism;
S4: the prestress adjusting mechanism is arranged on the supporting mechanism, and the height of the steering block is adjusted through the prestress adjusting mechanism;
s5: filling a backing plate in a gap between the steering block and the supporting mechanism;
s6: and (5) dismantling the prestress adjusting mechanism.
8. The construction method according to claim 7, wherein adhesive is applied to the upper and lower surfaces of each of the pad plates before the pad plates are padded in step S5.
9. The method according to claim 8, wherein the structural member to be reinforced is any one of a metal structural member, a concrete structural member, a wooden structural member, and a composite structural member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210569407.0A CN114892549B (en) | 2022-05-24 | 2022-05-24 | Expansion filling type external prestress CFRP material reinforcing system and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210569407.0A CN114892549B (en) | 2022-05-24 | 2022-05-24 | Expansion filling type external prestress CFRP material reinforcing system and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114892549A CN114892549A (en) | 2022-08-12 |
| CN114892549B true CN114892549B (en) | 2024-05-14 |
Family
ID=82724379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210569407.0A Active CN114892549B (en) | 2022-05-24 | 2022-05-24 | Expansion filling type external prestress CFRP material reinforcing system and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114892549B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101838971A (en) * | 2009-03-17 | 2010-09-22 | 上海建泰预应力工程有限公司 | Construction method for carrying out external prestressing strengthening on bridge by transverse tensioning method |
| CN106522114A (en) * | 2016-10-28 | 2017-03-22 | 同济大学 | Concrete structure prestress reinforcing device adopting CFRP cloth |
| CN106544962A (en) * | 2016-10-28 | 2017-03-29 | 同济大学 | The prestress reinforced construction method of xoncrete structure |
| CN107842210A (en) * | 2017-12-08 | 2018-03-27 | 清华大学 | The construction package and its method for applying prestressing force of CFRP plate multi-point support prestressed reinforcements |
| KR20200000908A (en) * | 2018-06-26 | 2020-01-06 | 전주대학교 산학협력단 | Continuous Steel Girder System with adjustable CFRP member |
| CN113914655A (en) * | 2021-11-18 | 2022-01-11 | 河海大学 | External transverse tension prestress implementation device and reinforcing beam member construction method thereof |
-
2022
- 2022-05-24 CN CN202210569407.0A patent/CN114892549B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101838971A (en) * | 2009-03-17 | 2010-09-22 | 上海建泰预应力工程有限公司 | Construction method for carrying out external prestressing strengthening on bridge by transverse tensioning method |
| CN106522114A (en) * | 2016-10-28 | 2017-03-22 | 同济大学 | Concrete structure prestress reinforcing device adopting CFRP cloth |
| CN106544962A (en) * | 2016-10-28 | 2017-03-29 | 同济大学 | The prestress reinforced construction method of xoncrete structure |
| CN107842210A (en) * | 2017-12-08 | 2018-03-27 | 清华大学 | The construction package and its method for applying prestressing force of CFRP plate multi-point support prestressed reinforcements |
| KR20200000908A (en) * | 2018-06-26 | 2020-01-06 | 전주대학교 산학협력단 | Continuous Steel Girder System with adjustable CFRP member |
| CN113914655A (en) * | 2021-11-18 | 2022-01-11 | 河海大学 | External transverse tension prestress implementation device and reinforcing beam member construction method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114892549A (en) | 2022-08-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113454306B (en) | Integral lifting construction method and device for arch structure | |
| CN109750791B (en) | Assembled large cantilever steel structure | |
| CN217538018U (en) | Horizontal tensioning system of external prestressing force CFRP material of formula of pushing down | |
| CN107842210A (en) | The construction package and its method for applying prestressing force of CFRP plate multi-point support prestressed reinforcements | |
| KR20040008236A (en) | Prestressing method with large eccentricity and no axial force by simple tensioning, the device for it, and the PSC beam utilizing the method and the device | |
| CN110541580A (en) | prestressed carbon fiber plate anchorage device system | |
| CN212478635U (en) | Lightweight prestressing force carbon fiber plate ground tackle | |
| CN114892549B (en) | Expansion filling type external prestress CFRP material reinforcing system and construction method thereof | |
| KR101209063B1 (en) | Pre-stressed girder by plate and method thereof | |
| CN109235924A (en) | The double rod prior-warning device and ductility of pre-stress FRP ruggedized construction regulate and control method | |
| CN218758965U (en) | Top bracing type reinforcing device for carbon fiber cable reinforced member | |
| CN110984615B (en) | CFRP sheet combination beam string reinforcing and mounting system | |
| CN114892548B (en) | Down-pressure type external prestress CFRP material reinforcing system and construction method thereof | |
| CN114809704B (en) | Tightening type external prestress CFRP material reinforcing system and construction method | |
| CN110984614A (en) | CFRP sheet clamping anchorage device with adjustable angle | |
| EP2336455A1 (en) | Construction systeme for strengthening an existing structure with tension sheets and a respective anchoring device and method therefore | |
| CN214738755U (en) | Independent external prestress loading device applied to metal beam | |
| CN217680729U (en) | Expansion filling type external prestress CFRP material transverse tensioning system | |
| CN116427627A (en) | Parallel-open CFRP plate anchoring system and construction method thereof | |
| CN207296461U (en) | The steel plate tensioned anchorage system of pre-stressed steel plate reinforced concrete beam | |
| CN218757049U (en) | System for be used for linear adjustment of steel construction bridge overlength ropeless district cantilever construction | |
| CN219753698U (en) | Packed anchoring device for forward tensioning of CFRP plate | |
| CN116771152A (en) | CFRP plate horizontal direction secondary adjustment tensioning construction method and system | |
| CN219794702U (en) | Multi-degree-of-freedom adjustable secondary tensioning type CFRP plate forward tensioning and anchoring device | |
| CN212404858U (en) | Device for supporting rigid suspension cable by using existing suspension rod |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |