Embedded FRP rib anchoring device
By designing an embedded FRP rib anchoring device, the guide assembly, annular enclosure and screwing section structure is used to solve the problem of premature peeling of FRP materials and concrete protective layer, which improves the bonding strength, delays peeling failure, and reduces the reinforcement cost.
Patent Information
- Application Number
- CN202421774779.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-07-25
AI Technical Summary
In near-surface mounting reinforcement technology, premature peeling of FRP material and concrete protective layer leads to reinforcement failure. The main damage mechanism is that the end bending cracks and shear cracks at the FRP ribs intersect, and further expand along the FRP ribs, causing the FRP ribs to peel off together with the concrete protective layer.
An embedded FRP bar anchoring device is designed, including a steel wire tow, fastener, one, fastener, two and guide assembly. Through the guide assembly, the steel wire tow is guided when it passes through the FRP bar, forming an annular enclosure and a screwing section, increasing the bonding strength between the steel wire tow and concrete, and preventing cracks from developing along the length of the FRP bar.
It effectively improves the bonding strength between the steel wire tow and concrete, delays and even avoids the peeling failure of the concrete protective layer, reduces the economic cost of reinforcement projects, and is suitable for the reinforcement of positive and negative bending moment zones of concrete structures.
Smart Images
Figure CN222810518U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of structural reinforcement, in particular to an embedded FRP tendon anchoring device. Background Art
[0002] Carbon fiber reinforced polymer (CFRP) material has the advantages of high tensile strength, light weight, strong corrosion resistance, etc., and is a very promising reinforcement material. At present, the mainstream reinforcement technologies are mainly external bonding reinforcement technology and near-surface installation reinforcement technology. Among these two reinforcement technologies, CFRP materials are widely used in strengthening and repairing reinforced concrete structures and masonry structures.
[0003] In the near-surface installation reinforcement technology, first fill the pre-sawn groove on the tension side of the reinforced concrete member with an appropriate amount of mortar or epoxy resin glue, then place the FRP bar in the groove, continue to fill with mortar or epoxy resin glue until the FRP bar is completely wrapped, and finally smooth the surface. Compared with the external bonding reinforcement technology, in the near-surface installation technology, the FRP-concrete and FRP-steel interfaces have stronger bonding properties, which can avoid or delay the premature peeling of the FRP bars and improve their strength contribution rate. At the same time, the near-surface installation reinforcement technology can strengthen certain specific components, such as cantilever components and structures that are severely corroded. In addition, since the FRP material is wrapped by the filling material, it can avoid or reduce damage caused by accidental impact, fire and mechanical damage, so the reinforcement technology has higher durability. This feature also makes this technology particularly suitable for reinforcing the negative bending moment area of reinforced concrete beams.
[0004] However, a large number of tests have shown that near-surface installation reinforcement technology often fails due to premature peeling of the FRP material and the concrete cover. The main failure mechanism is that the bending crack and the shear crack intersect at the end of the FRP tendon and then further extend along the FRP tendon, causing the FRP tendon to peel off together with the concrete cover.
[0005] Therefore, in view of the above problems, an embedded FRP tendon anchoring device is proposed to solve the above problems. Utility Model Content
[0006] In view of the deficiencies in the prior art, the utility model develops an embedded FRP tendon anchoring device, which improves the bonding strength between the steel wire bundle and the concrete, delays or even avoids the peeling failure of the concrete protective layer, and greatly reduces the economic cost of the reinforcement project.
[0007] The technical solution to the technical problem solved by the utility model is as follows: the utility model provides an embedded FRP tendon anchoring device, including a steel wire bundle, a fastener one, a fastener two and a guide assembly, the guide assembly including a connecting hose, a connecting rod and an adjusting member, the adjusting member is rotatably connected to the connecting hose through the connecting rod, the connecting hose passes through the steel wire bundle, the two free ends of the steel wire bundle pass through the fastener one to form an annular encirclement and a twisting section, the annular encirclement surrounds the FRP tendon, and the two free ends of the twisting section away from the fastener one pass through the fastener two.
[0008] As an optimization, the adjusting part includes a guide plate, sliding plate one, sliding plate two and an arc plate. Sliding plate one and sliding plate two are slidably arranged in the guide plate. An arc plate is respectively arranged at the bottom of sliding plate one and sliding plate two, and the two arc plates are arranged opposite to each other.
[0009] As an optimization, T-shaped clamping blocks are arranged on both the sliding plate 1 and the sliding plate 2, and a T-shaped clamping groove is arranged on the guide plate along the length direction of the guide plate, and the T-shaped clamping block is slidably arranged in the T-shaped clamping groove.
[0010] As an optimization, an insertion plate and an insertion groove are respectively arranged at the ends of the sliding plate 1 and the sliding plate 2 close to each other, and the insertion plate and the insertion groove are plugged into each other along the length direction of the guide plate.
[0011] As an optimization, long holes are provided on the insertion plate and the insertion slot along the length direction of the guide plate, and adjusting bolts are provided in the long holes.
[0012] As an optimization, a mounting hole is opened on the guide plate, the mounting hole is located in the middle of a side of the guide plate away from the arc plate, and a baffle is set through the mounting hole at one end of the connecting rod away from the connecting hose.
[0013] As an optimization, the annular encirclement and the twisting section can be bent to form an angle α, where ɑ is 0°-60°.
[0014] As an optimization, the outer cross-section shape of fastener 1 and fastener 2 is square, and the inner cross-section shape is consistent with the shape of the steel wire bundle.
[0015] The effects provided in the utility model content are only the effects of the embodiments, not all the effects of the utility model. The above technical solution has the following advantages or beneficial effects:
[0016] The guide assembly is provided to facilitate guiding of the steel wire bundle when it passes through the FRP bar. The device can firmly fix the FRP bar. The twisting section at the bottom of the steel wire bundle is twisted and has a rough surface, which can increase the friction of the steel wire bundle when it is pulled out of the concrete, further improve the bonding strength between the steel wire bundle and the concrete, and prevent cracks from developing along the length of the FRP bar, thereby delaying or even avoiding the failure of the concrete protective layer to peel off. The device has a compact structure and is easy to construct. After reinforcement, the FRP bar and the anchor device are flush with the concrete surface, and the surface of the structure is flat, which does not affect the normal use of the structure. At the same time, it is suitable for reinforcement in the positive bending moment zone and the negative bending moment zone of the concrete structure, which can greatly reduce the economic cost of the reinforcement project. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.
[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0019] Figure 2 It is a structural schematic diagram of the adjusting member of the utility model;
[0020] Figure 3 It is a side view of the adjusting member of the utility model;
[0021] Figure 4 It is the installation diagram of the utility model.
[0022] In the figure, 1, wire bundle; 11, annular encirclement; 12, tightening section; 2, fastener 1; 3, fastener 2; 4, connecting hose; 5, connecting rod; 51, baffle; 6, adjusting member; 61, guide plate; 611, mounting hole; 62, sliding plate 1; 63, sliding plate 2; 64, arc plate; 65, T-shaped block; 66, T-shaped slot; 67, insert plate; 68, insert slot; 69, long hole; 7, FRP rib; 8, adjusting bolt; 9, epoxy resin glue. DETAILED DESCRIPTION
[0023] In order to clearly illustrate the technical features of this solution, the utility model is described in detail below through specific implementation methods and in combination with the accompanying drawings. The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. In addition, the utility model can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. It should be noted that the components illustrated in the accompanying drawings are not necessarily drawn to scale. The utility model omits the description of known components and processing technologies and processes to avoid unnecessary limitations on the utility model. The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0024] like Figures 1 to 4 As shown, an embedded FRP bar anchoring device includes a steel wire bundle 1, a fastener 1 2, a fastener 2 3 and a guide assembly, the guide assembly includes a connecting hose 4, a connecting rod 5 and an adjusting member 6, the adjusting member 6 is rotatably connected to the connecting hose 4 through the connecting rod 5, the connecting hose 4 is arranged through the steel wire bundle 1, the two free ends of the steel wire bundle 1 are arranged through the fastener 1 2 to form an annular encirclement 11 and a twisting section 12, the annular encirclement 11 surrounds the FRP bar 7, and the two free ends of the twisting section 12 away from the fastener 1 2 are arranged through the fastener 2 3. The end of the twisting section 12 is welded, and the cross section is larger than the inner cross section of the fastener 2 3, which can prevent the fastener 2 3 from falling off the steel wire bundle 1.
[0025] By setting a guide component, it is convenient to guide the steel wire bundle 1 when it passes through the FRP bar 7. The device can firmly fix the FRP bar 7. The twisting section 12 at the bottom of the steel wire bundle 1 is twisted and has a rough surface, which can increase the friction of the steel wire bundle when it is pulled out of the concrete, further improve the bonding strength between the steel wire bundle 1 and the concrete, and prevent cracks from developing along the length direction of the FRP bar 7, thereby delaying or even avoiding the failure of the concrete protective layer to peel off. The device has a compact structure and is easy to construct. After reinforcement, the FRP bar 7 and the anchoring device are flush with the concrete surface, and the surface of the structure is flat, which does not affect the normal use of the structure. At the same time, it is suitable for reinforcement in the positive bending moment zone and the negative bending moment zone of the concrete structure, which can greatly reduce the economic cost of the reinforcement project.
[0026] In this embodiment, the adjusting member 6 includes a guide plate 61, a sliding plate 1 62, a sliding plate 2 63 and an arc plate 64. The sliding plate 1 62 and the sliding plate 2 63 are slidably arranged in the guide plate 61. An arc plate 64 is respectively arranged at the bottom of the sliding plate 1 62 and the sliding plate 2 63, and the two arc plates 64 are arranged opposite to each other.
[0027] The first sliding plate 62 and the second sliding plate 63 are both provided with a T-shaped clamping block 65 . The guide plate 61 is provided with a T-shaped clamping groove 66 along the length direction of the guide plate 61 . The T-shaped clamping block 65 is slidably disposed in the T-shaped clamping groove 66 .
[0028] An insertion plate 67 and an insertion groove 68 are respectively disposed at the ends of the sliding plate 1 62 and the sliding plate 2 63 that are close to each other. The insertion plate 67 and the insertion groove 68 are mutually plugged and disposed along the length direction of the guide plate 61 .
[0029] The insertion plate 67 and the insertion groove 68 are both provided with a long hole 69 along the length direction of the guide plate 61 , and an adjusting bolt 8 is arranged in the long hole 69 .
[0030] The guide plate 61 is provided with a mounting hole 611, which is located in the middle of one side of the guide plate 61 away from the arc plate 64. The end of the connecting rod 5 away from the connecting hose 4 passes through the mounting hole 611 to set a baffle 51. When the guide assembly is in use, the steel wire bundle 1 is first passed through the connecting hose 4, and then the sliding plate 1 62 and the sliding plate 2 63 are moved relative to each other, driving the arc plate 64 to surround the FRP rib 7, and the insert plate 67 and the insert groove 68 are plugged into each other, and then the sliding plate 1 62 and the sliding plate 2 6 are fixed in the long hole 69 by using the adjusting bolt 8, and then the position of the two arc plates 64 is fixed, which is convenient for guiding.
[0031] The annular encircling ring 11 and the twisting section 12 can be bent to form an angle α, ɑ is 0°-60°. The annular encircling ring 11 and the twisting section 12 of the steel wire bundle 1 are bent at a certain angle, so that the pulling force that the steel wire bundle 1 needs to bear is converted into the combined force of shear force and pulling force, thereby improving the utilization rate of the steel wire bundle 1. In addition, according to the actual engineering situation, the steel wire bundle angle can be freely bent and adjusted, and the steel wire bundle 1 can be extended under the stirrup, which plays a role in enhancing anchoring, further improving anchoring efficiency, and delaying the peeling of the concrete protective layer.
[0032] The outer cross-section of the fastener 1 2 and the fastener 2 3 is square, and the inner cross-section is consistent with the shape of the steel wire bundle 1. The friction between the fastener 1 2 and the fastener 2 3 and the steel wire bundle 1 can be further increased after tightening, preventing relative displacement after reinforcement and affecting the reinforcement effect.
[0033] Steps for using this device:
[0034] (1) Use the guide assembly to install the two ends of the FRP bar 7 on the upper part of the steel wire bundle 1 of the anchoring device, move the fastener 2 upward, and tighten the steel wire bundle 1 to make it reliably connected to the FRP bar 7;
[0035] (2) Use a cutting machine to cut out the corresponding groove on the tensile side of the reinforced concrete structure according to the size of FRP bar 7, and use an impact drill to drill a hole at the end of the groove. The hole depth should refer to the anchor device, and the surface should be processed and dust should be removed;
[0036] (3) Fill the groove about halfway with mortar or epoxy resin glue 9;
[0037] (4) Place the FRP reinforcement 7 and the anchoring device in the groove, and place the anchoring device in the corresponding hole;
[0038] (5) injecting mortar or epoxy resin glue 9 or self-compacting concrete into the hole to fix the anchor device;
[0039] (6) Continue to fill the groove with mortar or epoxy resin glue 9 until the FRP reinforcement 7 and the anchoring device are completely covered and flush with the concrete surface, and then smooth the surface.
[0040] Although the specific implementation methods of the utility model are described above in conjunction with the accompanying drawings, this does not limit the scope of protection of the utility model. On the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.
Claims
1. An embedded FRP tendon anchoring device, characterized by: It comprises a steel wire bundle (1), a first fastener (2), a second fastener (3) and a guide assembly, The guide assembly comprises a connecting hose (4), a connecting rod (5) and an adjusting member (6). The adjusting member (6) is rotatably connected to the connecting hose (4) via the connecting rod (5). The connecting hose (4) is arranged through the steel wire bundle (1), and the two free ends of the steel wire bundle (1) are arranged through the fastener one (2) to form an annular encircling ring (11) and a twisting section (12), the annular encircling ring (11) surrounds the FRP rib (7), and the two free ends of the twisting section (12) away from the fastener one (2) are arranged through the fastener two (3).
2. The embedded FRP tendon anchoring device according to claim 1 is characterized in that: The adjusting member (6) comprises a guide plate (61), a sliding plate 1 (62), a sliding plate 2 (63) and an arc plate (64). The sliding plate 1 (62) and the sliding plate 2 (63) are slidably arranged in the guide plate (61). An arc plate (64) is respectively arranged at the bottom of the sliding plate 1 (62) and the sliding plate 2 (63). The two arc plates (64) are arranged opposite to each other.
3. The embedded FRP tendon anchoring device according to claim 2 is characterized in that: The first sliding plate (62) and the second sliding plate (63) are both provided with a T-shaped clamping block (65), and the guide plate (61) is provided with a T-shaped clamping groove (66) along the length direction of the guide plate (61), and the T-shaped clamping block (65) is slidably arranged in the T-shaped clamping groove (66).
4. The embedded FRP tendon anchoring device according to claim 2 is characterized in that: An insertion plate (67) and an insertion groove (68) are respectively arranged at the ends of the sliding plate 1 (62) and the sliding plate 2 (63) close to each other. The insertion plate (67) and the insertion groove (68) are mutually plugged and arranged along the length direction of the guide plate (61).
5. The embedded FRP tendon anchoring device according to claim 4 is characterized in that: The insertion plate (67) and the insertion groove (68) are both provided with a long hole (69) along the length direction of the guide plate (61), and an adjusting bolt (8) is arranged in the long hole (69).
6. The embedded FRP tendon anchoring device according to claim 3 is characterized in that: The guide plate (61) is provided with a mounting hole (611), which is located at the middle of a side of the guide plate (61) away from the arc-shaped plate (64), and an end of the connecting rod (5) away from the connecting hose (4) passes through the mounting hole (611) to provide a baffle (51).
7. The embedded FRP tendon anchoring device according to claim 1 is characterized in that: The annular encircling ring (11) and the twisting section (12) can be bent to form an angle α, where α is 0°-60°.
8. The embedded FRP tendon anchoring device according to claim 1 is characterized in that: The outer cross-section of the fastener 1 (2) and the fastener 2 (3) is a square, and the inner cross-section is consistent with the shape of the steel wire bundle (1).