CN219887648U - CFRP plate forward tensioning and anchoring device with multiple degrees of freedom adjustment - Google Patents

Abstract

The utility model discloses a CFRP plate forward tensioning and anchoring device with multiple degrees of freedom adjustment, which comprises an anchoring seat, a steering block, an installation seat and a CFRP anchor, wherein the steering block is rotationally connected with the anchoring seat through a first direction rotating shaft, the installation seat is rotationally connected with the steering block through a second direction rotating shaft, the CFRP anchor is in sliding connection with the installation seat through a traction screw, a prestress adjusting mechanism is detachably arranged between the CFRP anchor and the installation seat, the prestress adjusting mechanism is used for adjusting the sliding position of the CFRP anchor, and a locking nut is further arranged on the traction screw. The effect is as follows: in the process of applying prestress to the CFRP plate by the prestress adjusting mechanism, the CFRP anchor can adaptively adjust the included angle of the CFRP anchor relative to the structural member to be reinforced under the action of the first direction rotating shaft, so that stress concentration between the CFRP plate and the CFRP anchor caused by section change and material rigidity change is effectively solved, external force perpendicular to the plane of the CFRP plate is eliminated, and brittle failure of the CFRP plate is prevented while prestress is effectively applied.

Description

CFRP plate forward tensioning and anchoring device with multiple degrees of freedom adjustment

Technical Field

The utility model relates to the technical field of external prestress reinforcement applied in civil engineering, in particular to a CFRP plate forward tensioning and anchoring device with multiple degrees of freedom adjustment.

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 active reinforcement method is necessarily applied to a matched tensioning system, for example, chinese patent application ZL202010702249.2 discloses a tensioning and anchoring device of a prestressed CFRP plate reinforcing beam and a using method thereof, wherein the tensioning and anchoring device comprises a CFRP plate, an anchoring assembly and a tensioning assembly; the tensioning assembly comprises a tensioning smooth bore, a second clamp, a limiting plate and a tensioning mechanism; the contact surfaces of the expansion plate and the second clamp are provided with saw teeth with opposite directions. According to the CFPR plate, the two groups of clamps fixedly clamped at the two ends of the CFRP plate are arranged in the two groups of sliding bores to apply prestress, so that the eccentricity of the tensioning force can be prevented, the self-locking of the CFPR plate after the prestress is applied is realized through the mutual cooperation of the saw teeth between the telescopic plate and the second clamp, and the retraction of the CFPR plate is limited.

However, the above-mentioned patent has the following drawbacks in engineering applications:

(1) The CFRP plate is always attached to the outer surface of the structural member to be reinforced (namely body surface prestress is applied) in the tensioning process, so that the CFRP plate is closer to the neutral axis of the structural member to be reinforced, and the reinforcing effect is poor;

(2) When reinforcing materials with larger eccentricity are arranged, due to poor shearing resistance of the CFRP plate, when the CFRP plate is subjected to external force perpendicular to the plane of the CFRP plate, brittle fracture of the carbon fiber reinforced composite material is easy to occur, so that a hogging moment which can be provided for a structural member to be reinforced is very limited, and therefore, the technical problem of mid-span downwarping of the structural member to be reinforced cannot be effectively solved;

(3) The patent also carries out pasting construction after tensioning is completed, the reinforcement needs to be singly polished, cleaned and the like, the CFRP plate is pasted with the surface of the structural member to be reinforced through structural adhesive, the working procedure is complicated, and the cost is high;

(4) The bonding requirement is high, and peeling failure is easy to occur due to unsatisfactory bonding effect or aging of bonding glue.

Disclosure of Invention

The utility model aims to provide a CFRP plate forward tensioning and anchoring device with multiple degrees of freedom adjustment, which can avoid brittle fracture of a CFRP plate with larger eccentricity when the CFRP plate is arranged, so as to effectively improve the reinforcing effect, provide enough hogging moment for a to-be-reinforced member, and pointedly solve the technical problems of mid-span downwarping of the to-be-reinforced member and the like.

In order to achieve the above purpose, the utility model provides a CFRP plate forward tensioning and anchoring device with multiple degrees of freedom adjustment, which is characterized in that: the CFRP anchor is in sliding connection with the mounting seat through a traction screw, a prestress adjusting mechanism is detachably arranged between the CFRP anchor and the mounting seat, the prestress adjusting mechanism is used for adjusting the sliding position of the CFRP anchor on the traction screw, and a locking nut used for locking the sliding position of the CFRP anchor is further arranged on the traction screw; wherein: the central axis of the first direction rotating shaft is orthogonal to the central axis of the second direction rotating shaft.

Still further, the CFRP anchor includes a sliding seat slidably provided on the traction screw and an anchor body hung forward or backward on the sliding seat.

Furthermore, the anchor body is hung on the sliding seat in front, and a passage hole for the CFRP plate to penetrate is reserved on the sliding seat.

Still further, prestressing force adjustment mechanism includes cavity jack and butt piece, the cavity jack cup joints through fixation nut on the traction screw rod, butt piece butt is in between the output of cavity jack and the CFRP ground tackle.

Furthermore, the abutting block adopts a hollow frame structure, the hollow frame structure is sleeved on the traction screw rod through holes formed in two sides, the traction screw rod in the hollow frame structure is connected with the locking nut, and the size of the locking nut is smaller than that of the through holes.

Still further, the CFRP anchor is one of a flat plate anchor, a wedge anchor, or a wave anchor.

Still further, a multi-layered CFRP plate anchor interface is provided in the CFRP anchor.

Compared with the prior art, the utility model has the remarkable effects that:

1. according to the utility model, the reinforcement materials with larger eccentricity can be arranged, on one hand, the CFRP plate can be far away from the neutral axis of the structural member to be reinforced, so that the effect of prestress application is improved, and the technical problem of mid-span downwarping of the structural member to be reinforced is solved in a targeted manner; the other side prestress adjusting mechanism can avoid prestress loss by locking the position of the CFRP anchor on the traction screw through the lock nut after tensioning the CFRP reinforcement to target prestress, so that construction is more convenient; meanwhile, the prestress adjusting mechanism can be easily disassembled after the CRRP anchorage device is locked, so that the construction cost is reduced;

2. in the process of applying prestress to the CFRP plate by the prestress adjusting mechanism, the CFRP anchor can adaptively adjust the included angle of the CFRP anchor relative to the structural member to be reinforced under the action of the first direction rotating shaft, so that stress concentration between the CFRP plate and the CFRP anchor caused by section change and material rigidity change is effectively solved, external force vertical to the plane of the CFRP plate is eliminated, and brittle failure of the CFRP plate is prevented while prestress is effectively applied;

3. the CFRP anchorage device can adaptively turn under the action of the second-direction rotating shaft so as to automatically adjust to balance in the tensioning process of the CFRP plate, the force transmission path is clear and direct, and the axial tension of the CFRP plate can be always ensured, so that the CFRP plate is ensured not to be bent, and the CFRP plate is uniformly stressed so as to avoid damage and even fracture in the tensioning process;

4. the CFRP reinforcement is not required to be adhered in the whole process, so that the construction is more convenient, and the cost performance is higher;

5. the anchor body can be freely replaced according to the actual condition of the structural member to be processed, the reinforcement form of the CFRP plate, the prestress application size and other factors, so that the universality of the end fixing system is obviously improved, and the application range is wider;

6. the system has wide application prospect, not only can be used for external prestress reinforcement, but also can be used for new structures, such as steel structures, concrete structures, wooden structures, combined structures and the like.

Drawings

In order to more clearly illustrate the embodiments of the utility model 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 utility model, 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 overall structure of the first embodiment;

fig. 2 is a perspective view of the first embodiment;

FIG. 3 is a view showing a usage state of the embodiment at a viewing angle;

FIG. 4 is a view showing a use state of the embodiment under another view angle;

reference numerals in the drawings: 1-anchor seat, 2-CFRP plate, 3-CFRP anchor, 4-traction screw, 5-prestressing force adjustment mechanism, 6-lock nut, 7-steering block, 8-mount seat, 10-slide seat, 11-anchor body, 12-access port, 13-cavity jack, 14-butt piece, 15-fixation nut, 16-first direction pivot, 17-second direction pivot, 18-structure to be reinforced, 19-supporting mechanism.

Detailed Description

Embodiments of the present utility model 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 utility model and should not be construed as limiting the utility model.

In the description of the present utility model, 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 utility model 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 utility model. Furthermore, in the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Fig. 1 and 2 show a first embodiment of the utility model: the utility model provides a CFRP board 2 stretch-draw anchor with adjustable every single move which characterized in that: the CFRP anchor comprises an anchor seat 1, a steering block 7, an installation seat 8 and a CFRP anchor 3, wherein the steering block 7 is rotationally connected with the anchor seat 1 through a first direction rotating shaft 16, the installation seat 8 is rotationally connected with the steering block 7 through a second direction rotating shaft 17, the CFRP anchor 3 is slidably connected with the installation seat 8 through a traction screw 4, a prestress adjusting mechanism 5 is further detachably arranged between the CFRP anchor 3 and the installation seat 8, the prestress adjusting mechanism 5 is used for adjusting the sliding position of the CFRP anchor 3 on the traction screw 4, and a locking nut 6 used for locking the sliding position of the CFRP anchor 3 is further arranged on the traction screw 4; wherein: the central axis of the first direction rotating shaft 16 is orthogonal to the central axis of the second direction rotating shaft 17.

In specific implementation, the CFRP anchor 3 includes a sliding seat 10 and an anchor body 11, the sliding seat 10 is slidably disposed on the traction screw 4, the anchor body 11 is forward hung on the sliding seat 10, and a passage opening 12 through which the CFRP plate 2 passes is reserved on the sliding seat 10. In other embodiments, the anchor body 11 may also be hung on the sliding seat 10 (not shown in the drawing), and when the anchor body 11 is hung on the sliding seat 10, no passage opening 12 is required to be reserved.

As can be seen from fig. 2, the prestress adjusting mechanism 5 includes a hollow jack 13 and an abutment block 14, the hollow jack 13 is sleeved on the traction screw 4 through a fixing nut 15, and the abutment block 14 abuts between the output end of the hollow jack and the CFRP anchor 3. Preferably, in order to facilitate the constructor to dismantle the abutment block 14 after the prestressing force is applied, the abutment block 14 adopts a hollow frame structure, the hollow frame structure is sleeved on the traction screw 4 through holes formed in two sides, the traction screw 4 in the hollow frame structure is connected with the locking nut 6, and the size of the locking nut 6 is smaller than that of the through holes.

In this embodiment, the CFRP anchor 3 is 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 requirements of structures with different tonnages, a single-layer CFRP plate 2 anchor interface or a multi-layer CFRP plate 2 anchor interface can be arranged in the CFRP mould. It should be noted that the application object of the CFRP anchor 3 is not limited to the CFRP plate 2, and in fact, the CFRP anchor 3 may be a CFRP cable anchor 3, a CFRP grid anchor 3, or the like, according to different construction environments and different forms of the structural members 18 to be reinforced.

The principles of the present utility model are explained below with reference to examples:

referring to fig. 3 and 4, before the prestressing force is applied, two ends of the CFRP plate 2 are respectively fixed on the structural member 18 to be reinforced through end anchoring devices, at least one of the two end anchoring devices is a forward tensioning anchoring device; the supporting mechanisms 19 of the CFRP plates 2 are then arranged at predetermined intervals on the structural members 18 to be reinforced; after the arrangement of the supporting mechanism 19 is completed, the sliding position of the CFRP anchor 3 on the traction screw 4 is adjusted through the prestress adjusting mechanism 5 to realize the external prestress application of the structural member 18 to be reinforced, and after the target prestress is reached, the CFRP anchor 3 is locked on the traction screw 4 through the locking nut 6, so that the prestress loss can be avoided; after the lock nut 6 locks the CFRP anchorage device 3, the prestress adjusting mechanism 5 is removed, and the construction can be completed.

In summary, the present utility model can arrange the reinforcing material with larger eccentricity, on one hand, the CFRP plate 2 can be far away from the neutral axis of the structural member 18 to be reinforced, so as to improve the effect of applying the prestress, and thus, the technical problem of mid-span downwarping of the structural member 18 to be reinforced is solved pointedly; after the CFRP reinforcement is tensioned to target prestress, the prestress adjusting mechanism 5 on the other side locks the position of the CFRP anchor 3 on the traction screw 4 through the locking nut 6, so that prestress loss can be avoided, and construction is more convenient; meanwhile, the prestress adjusting mechanism 5 can be easily disassembled after the CRRP anchorage device 3 is locked, so that the construction cost is reduced; in the process of applying prestress to the CFRP plate 2 by the prestress adjusting mechanism 5, the CFRP anchor 3 can adaptively adjust the included angle of the CFRP anchor 3 relative to the structural member 18 to be reinforced under the action of the first direction rotating shaft 16, so that stress concentration between the CFRP plate 2 and the CFRP anchor 3 caused by section change and material rigidity change is effectively conducted, external force vertical to the plane of the CFRP plate 2 is eliminated, and brittle fracture of the CFRP plate 2 is prevented while prestress is effectively applied; the CFRP anchor 3 can adaptively turn under the action of the second direction rotating shaft 17 so as to automatically adjust to balance in the tensioning process of the CFRP plate 2, the force transmission path is clear and direct, and the axial tension of the CFRP plate 2 can be always ensured, so that the inside of the CFRP plate 2 is ensured not to be bent, the CFRP plate 2 is uniformly stressed, and the CFRP plate is prevented from being damaged or even broken in the tensioning process; the CFRP reinforcement is not required to be adhered in the whole process, so that the construction is more convenient, and the cost performance is higher; the anchor body 11 can be freely replaced according to the actual condition of the structural member to be processed, the reinforcement form of the CFRP plate 2, the prestress application size and other factors, so that the universality of the end fixing system is obviously improved, and the application range is wider; the system has wide application prospect, not only can be used for external prestress reinforcement, but also can be used for new structures, such as steel structures, concrete structures, wooden structures, combined structures and the like.

The above disclosure is only a preferred embodiment of the present utility model, and it should be understood that the scope of the utility model 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 utility model.

Claims (7)

1. A CFRP plate forward tensioning anchoring device with multiple degrees of freedom adjustment is characterized in that: the CFRP anchor is in sliding connection with the mounting seat through a traction screw, a prestress adjusting mechanism is detachably arranged between the CFRP anchor and the mounting seat, the prestress adjusting mechanism is used for adjusting the sliding position of the CFRP anchor on the traction screw, and a locking nut used for locking the sliding position of the CFRP anchor is further arranged on the traction screw; wherein: the central axis of the first direction rotating shaft is orthogonal to the central axis of the second direction rotating shaft.

2. The multi-degree of freedom tuned CFRP plate forward tensioning anchor of claim 1 wherein: the CFRP anchor comprises a sliding seat and an anchor body, wherein the sliding seat is slidably arranged on the traction screw rod, and the anchor body is hung on the sliding seat forwards or backwards.

3. The multi-degree of freedom tuned CFRP plate forward tensioning anchor of claim 2 wherein: the anchor body is hung on the sliding seat in front, and a passage port for the CFRP plate to penetrate is reserved on the sliding seat.

4. The multi-degree of freedom tuned CFRP plate forward tensioning anchor of claim 1 wherein: the prestress adjusting mechanism comprises a hollow jack and an abutting block, the hollow jack is sleeved on the traction screw rod through a fixing nut, and the abutting block abuts between the output end of the hollow jack and the CFRP anchorage device.

5. The multi-degree of freedom tuned CFRP plate forward tensioning anchor of claim 4 wherein: the butt piece adopts hollow frame structure, and it is through the through-hole cover that both sides were seted up locate on the traction screw rod be connected with on the traction screw rod in the hollow frame structure lock nut, just lock nut's size is less than the through-hole.

6. The multi-degree of freedom tuned CFRP plate forward tensioning anchor of any one of claims 1-5 wherein: the CFRP anchor is one of a flat anchor, a wedge anchor or a wave anchor.

7. The multi-degree of freedom tuned CFRP plate forward tensioning anchor of claim 6 wherein: the CFRP anchor is provided with a plurality of layers of CFRP plate anchor interfaces.