Self-prestressed multi-layer CFRP unidirectional plate cable tensioning anchorage device and construction method thereof

Abstract

The application discloses a self-pre-tightening multi-layer CFRP unidirectional plate cable tensioning anchorage device and a construction method thereof, the hole groups on the anchor block adopt symmetrical self-anchoring design, a single extrusion insert plate is arranged in each hole channel, the extrusion insert plate and the side wall of the hole channel form extrusion force in the radial direction towards the center of the plane of the anchor block, so that the CFRP unidirectional plate is clamped and anchored by using friction. The multiple extrusion hole groups are arranged in a ring-shaped symmetrical manner, and the stress distribution in the anchor block is optimized. In use, a preset friction force is formed by pressing the extrusion insert plate by using a top pressing piece to realize extrusion pre-tightening of the CFRP unidirectional plate, and the initial self-locking capacity of the anchorage device is improved. The self-pre-tightening multi-layer CFRP unidirectional plate cable tensioning anchorage device realizes large-tonnage anchoring of multiple CFRP unidirectional plates, the volume and self-weight of the anchor block are reduced while the anchoring tonnage is increased, and the adaptability of the anchorage device is increased. The application solves the problem that the existing CFRP anchoring system is mostly single-layer (single-piece) anchoring and it is difficult to realize large-tonnage anchoring in building construction.

Description

Technical Field

[0001] This invention relates to the technical field, specifically to a self-pre-tightened multi-layer CFRP unidirectional plate cable tensioning anchor and its construction method. Background Technology

[0002] Currently, the lightweight and high strength of carbon fiber reinforced plastic (CFRP) composites offer new possibilities for cable material selection, especially in spatial structure cable systems and bridge cable engineering. Compared to CRRP reinforcement, CFRP sheets offer a relatively large surface area, which is beneficial for the design flexibility of anchorages.

[0003] A well-designed CFRP one-way slab anchoring system is key to fully utilizing the superior tensile properties of CFRP sheets. Existing CFRP anchoring systems are mostly single-layer (single-piece) anchors, making it difficult to achieve large-tonnage anchoring. While increasing the number of anchors can increase the anchoring tonnage, it significantly increases the size of the anchoring system, thus limiting its application in engineering projects. Therefore, there is an urgent need in practical engineering for a compact and efficient multi-layer (multi-piece) CFRP sheet anchoring system.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, a self-pre-tightening multi-layer CFRP unidirectional plate cable tensioning anchor and its construction method are provided to solve the problem that existing CFRP anchoring systems in building construction are mostly single-layer (single-block) anchoring, making it difficult to achieve large-tonnage anchoring.

[0006] To achieve the above objectives, a self-pre-tightened multi-layer CFRP unidirectional plate-cable tensioning anchor is provided, comprising:

[0007] An anchor block has an inlet end and an outlet end opposite to each other. The outlet end has a receiving groove, and the inlet end has multiple extrusion holes. The multiple extrusion holes are equally spaced along the circumferential direction of the center of the plane of the anchor block. Each extrusion hole includes multiple channels, which penetrate the bottom of the receiving groove. The multiple channels are arranged radially along the center of the plane, and each channel is arranged circumferentially along the center of the plane. The diameter of the multiple channels in each extrusion hole gradually increases from the center of the plane towards the outer edge of the anchor block.

[0008] A compression insert, the shape of which is adapted to the shape of the inner cavity of the channel, one end of which is movably inserted into the channel, the other end of which extends into the receiving groove, and a clamping space is formed between one side of the compression insert and one side wall of the channel.

[0009] A CFRP unidirectional plate is inserted into each clamping space of the multiple extrusion hole groups;

[0010] A top pressure member, which is adjustablely installed in the receiving groove, abuts against the other end of the extrusion insert in the group of extrusion holes to cause the extrusion insert to slide toward the inlet end. The extrusion insert presses the CFRP one-way plate toward the side wall of the channel, so that the CFRP one-way plate is locked to the anchor block.

[0011] Furthermore, the anchor block is cylindrical, and the outer edges of the inlet end and the outlet end of the anchor block extend along the end face direction to form a reinforcing flange. The thickness of the reinforcing flange at the outlet end is greater than the groove depth of the receiving groove.

[0012] Furthermore, the receiving groove is cylindrical, the inner wall of the receiving groove is formed with internal threads, the pressing member is formed with external threads, and the pressing member is threadedly connected to the receiving groove.

[0013] Furthermore, the extrusion plate has a first end and a second end opposite to each other, and the thickness of the extrusion plate gradually increases from the first end to the second end.

[0014] Furthermore, the extrusion plate has a planar side and an inclined side facing each other, the inclined side being set at an angle to the planar side.

[0015] Furthermore, the magnitude of the inclination angle θ of the inclined plane satisfies formula (1), formula (1):

[0016]

[0017] Wherein, μ1 is the coefficient of friction between the CFRP one-way plate and the inner wall of the channel;

[0018] μ2 is the coefficient of friction between the extrusion plate and the inner wall of the channel.

[0019] Furthermore, after the top pressing member abuts against the other end of the extrusion insert plate in the group of multiple extrusion holes, the frictional force f generated between the extrusion insert plate and the CFRP one-way plate during the abutting process of the top pressing member;

[0020]

[0021] Wherein, F is the pre-tightening pressure of the abutment member pressing against the extrusion plate.

[0022] This invention provides a construction method for a self-pre-tightening multi-layer CFRP unidirectional plate cable tensioning anchor, comprising the following steps:

[0023] The anchor block is fixedly installed at one end of the building component;

[0024] A CFRP one-way plate is respectively inserted into each channel of the extrusion hole group at the inlet end of the anchor block;

[0025] One end of a compression insert is movably inserted into the channel, and the other end of the compression insert extends into the receiving groove. A clamping space is formed between one side of the compression insert and one side wall of the channel, so that the CFRP unidirectional plate is received in the clamping space.

[0026] Install the top pressure member into the receiving groove of the anchor;

[0027] Adjust the position of the top pressure member in the receiving groove so that the top pressure member abuts against the other end of the extrusion insert plate in the group of multiple extrusion holes so that the extrusion insert plate slides toward the entrance end of the anchor block. The extrusion insert plate presses the CFRP one-way plate toward the side wall of the channel so that the CFRP one-way plate is locked to the anchor block to achieve the pre-tightening self-anchoring of the CFRP one-way plate.

[0028] The CFRP unidirectional plate is tensioned while the position of the top pressure member in the receiving groove is adjusted so that the top pressure member abuts against the other end of the extrusion insert plate in the group of multiple extrusion holes to prevent stress relaxation of the CFRP unidirectional plate.

[0029] The beneficial effects of this invention are as follows: The self-pre-tightening multi-layer CFRP unidirectional plate and cable tensioning anchor of this invention features a symmetrical self-anchoring design with holes on the anchor block. Each hole contains a single extrusion plate, which forms a compressive force with the sidewall of the hole in the radial direction toward the center of the anchor block, thereby clamping the CFRP unidirectional plate and anchoring it using friction. The multiple extrusion holes are arranged symmetrically around the circumference, optimizing the stress distribution within the anchor block. In use, the top pressure member presses against the extrusion plate to achieve pre-tightening of the CFRP unidirectional plate, forming a preset frictional force and improving the initial self-locking capability of the anchor. This self-pre-tightening multi-layer CFRP unidirectional plate and cable tensioning anchor of the present invention enables large-tonnage anchoring of multiple CFRP unidirectional plates, increasing the anchoring tonnage while reducing the volume and weight of the anchor block, thus increasing the adaptability of the anchor. Attached Figure Description

[0030] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0031] Figure 1 This is a schematic diagram of the structure of a self-pre-tightened multilayer CFRP unidirectional plate cable tensioning anchor according to an embodiment of the present invention.

[0032] Figure 2 This is an exploded structural diagram of a self-pre-tightened multilayer CFRP unidirectional plate cable tensioning anchor according to an embodiment of the present invention.

[0033] Figure 3 This is a cross-sectional view of the anchor block according to an embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram of the outlet end of the anchor block according to an embodiment of the present invention.

[0035] Figure 5 This is a schematic diagram of the pre-tightening state of the top pressure component according to an embodiment of the present invention.

[0036] Figure 6 This is a schematic diagram of the extrusion insert plate according to an embodiment of the present invention. Detailed Implementation

[0037] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] Reference Figures 1 to 6 As shown, the present invention provides a self-pre-tightened multi-layer CFRP unidirectional plate cable tensioning anchor, comprising: an anchor block 1, a compression insert 2, a CFRP unidirectional plate 3, and a top pressure member 4.

[0040] Specifically, anchor block 1 has an inlet end and an outlet end. Combined Figure 3 and Figure 5 The anchor block has a receiving groove a at its outlet end. Multiple extrusion hole groups B are formed at the inlet end of the anchor block. These extrusion hole groups B are evenly spaced along the circumferential direction of the center of the plane of the anchor block 1. Each extrusion hole group B includes multiple channels b. The channels b penetrate the bottom of the receiving groove a. The channels b are arranged radially along the center of the plane. Each channel b is arranged circumferentially along the center of the plane. The cross-section of the channels is rectangular. The length of the channels b in each extrusion hole group gradually increases from the center of the plane towards the outer edge of the anchor block 1.

[0041] During installation, the CFRP one-way plate 3 is inserted through the hole at the inlet end of the anchor block and extends toward the outlet end, with the CFRP one-way plate 3 extending to the bottom of the receiving groove a at the outlet end of the anchor block.

[0042] The shape of the extrusion plate 2 is adapted to the shape of the inner cavity of the channel b. The outer dimensions of the extrusion plate are smaller than the outer dimensions of the channel.

[0043] See Figure 5 One end of each extrusion insert 2 is movably inserted into the channel b. The other end of each extrusion insert 2 extends into the receiving groove a. A clamping space is formed between one side of the extrusion insert 2 and one side wall of the channel b. A CFRP unidirectional plate 3 is inserted into each clamping space of the multi-channel extrusion hole group B.

[0044] The top pressure member 4 is adjustablely installed in the receiving groove a. The top pressure member 4 abuts against the other end of the extrusion plate 2 in the multi-extrusion hole group B so that the extrusion plate 2 slides toward the inlet end.

[0045] Because the shape of the extrusion insert is adapted to the shape of the channel, the extrusion insert is wedge-shaped. During installation, after the CFRP one-way plate is inserted into the channel at the inlet end of the anchor block, the extrusion insert is inserted into the channel at the inlet end of the anchor block from the receiving groove at the outlet end of the anchor block. Therefore, as the wedge-shaped extrusion insert slides towards the inlet end of the anchor block, it compresses the CFRP one-way plates on both sides and the inner wall of the channel, causing the friction between the CFRP one-way plates and the extrusion insert and the inner wall of the channel to continuously increase, thereby pre-tightening and self-anchoring the CFRP one-way plate in the anchor block.

[0046] After the extrusion plate 2 slides toward the inlet end, it presses the CFRP one-way plate 3 against the side wall of the channel b, thus locking the CFRP one-way plate 3 to the anchor block 1. As the depth of the extrusion plate inserted into the channel increases, the locking and anchoring force of the anchor block on the extrusion plate also increases.

[0047] See Figure 3 and Figure 5 As shown, the anchor block preferably has a regular shape. In this embodiment, the anchor block 1 is cylindrical. The outer edges of the inlet and outlet ends of the anchor block 1 respectively extend along the end face direction to form reinforcing flanges 11. The thickness of the reinforcing flange 11 at the outlet end is greater than the groove depth of the receiving groove a.

[0048] In a preferred embodiment, the receiving groove a is cylindrical. The inner wall of the receiving groove a has internal threads. The pressing member 4 has external threads. The pressing member 4 is threadedly connected to the receiving groove a.

[0049] In some embodiments, during the pre-tightening process before the CFRP one-way plate, the pressure member calculates the frictional force between the CFRP one-way plate and the anchor block by the depth of the screw-in receiving groove.

[0050] In a preferred embodiment, the extrusion insert 2 has a first end 21 and a second end 22 opposite to each other in its length direction. The thickness of the extrusion insert 2 gradually changes, making it a variable diameter plate. The thickness of the extrusion insert 2 gradually increases from the first end to the second end.

[0051] In a preferred embodiment, the extrusion insert 2 has a planar side c and an inclined side d opposite each other in its thickness direction. The inclined side d is set at an angle to the planar side c. The inclination θ of the inclined side is the angle formed between the inclined side and the planar side.

[0052] Preferably, the inclination angle θ of the inclined plane side d satisfies formula (1), formula (1):

[0053]

[0054] In this embodiment, the inclination angle θ of the inclined side d is 2.86°, μ1 is the friction coefficient between the CFRP one-way plate 3 and the inner wall of the channel b, and the friction coefficient is 0.3; μ2 is the friction coefficient between the extrusion insert plate 2 and the inner wall of the channel b, and the friction coefficient is 0.1.

[0055] In addition, after the top pressing member 4 abuts against the other end of the extrusion insert 2 in the multi-extrusion hole group B, the frictional force f generated between the extrusion insert 2 and the CFRP one-way plate 3 during the abutting process of the top pressing member 4.

[0056]

[0057] Wherein, F is the pre-tightening pressure of the abutment member pressing against the compression plate 2.

[0058] In this embodiment, the diameters of the anchor blocks from bottom to top (from the inlet end to the outlet end) are 270mm, 210mm, and 230mm, respectively, and the heights are 50mm, 150mm, and 100mm, respectively. Inside the anchor block, according to the number of CFRP one-way plates to be anchored, six groups of extrusion holes are sequentially arranged along the circumference of the anchor block. The six groups of extrusion holes are evenly spaced and arranged in a regular hexagonal pattern. Each group of extrusion holes includes six channels, wherein the six channels in each group are divided into three groups. The two channels in each group are of equal size, and the width (L) of the three groups of channels is equal and increases in a stepped manner. An interval of approximately 10mm is maintained between adjacent channels to ensure the strength of the anchor block.

[0059] The lengths of the channels are equal to or slightly greater than the width of the CFRP unidirectional sheet. Specifically, the lengths of the three sets of channels are 25mm, 60mm, and 90mm, respectively. The dimensions of the end of the channel connecting to the bottom of the receiving groove are 10mm×25mm, 10mm×60mm, and 10mm×90mm, respectively. The dimensions of the channels are 2mm greater than the thickness of the CFRP unidirectional sheet.

[0060] The specific dimensions of the extruded insert are as follows: Figure 6 As shown (unit: mm), the width of the extrusion plate and the angle of the bevel side are completely aligned with the channel, and the length of the extrusion plate is greater than the axial depth of the channel, which facilitates the application of pre-tightening force.

[0061] This invention provides a construction method for a self-pre-tightening multi-layer CFRP unidirectional plate cable tensioning anchor, comprising the following steps:

[0062] S1: Fix anchor block 1 to one end of the building component.

[0063] S2: A CFRP one-way plate 3 is respectively inserted into each channel b in the extrusion hole group B at the entrance end of the anchor block 1.

[0064] S3: One end of a compression insert 2 is movably inserted into the channel b, and the other end of the compression insert 2 extends into the receiving groove a. A clamping space is formed between one side of the compression insert 2 and one side wall of the channel b, so that the CFRP unidirectional plate 3 is received in the clamping space.

[0065] S4: Install the top pressure member 4 into the anchoring receiving groove a.

[0066] S5: Adjust the position of the top pressure member 4 in the receiving groove a so that the top pressure member 4 abuts against the other end of the extrusion insert 2 in the multi-extrusion hole group B so that the extrusion insert 2 slides toward the entrance end of the anchor block 1. The extrusion insert 2 extrudes the CFRP one-way plate 3 toward the side wall of the hole b so that the CFRP one-way plate 3 is locked to the anchor block 1 to achieve the pre-tight self-anchoring of the CFRP one-way plate 3.

[0067] S6: Tension the CFRP one-way plate 3, and at the same time adjust the position of the top pressure member 4 in the receiving groove a, so that the top pressure member 4 abuts against the other end of the extrusion insert plate 2 in the multi-extrusion hole group B to prevent stress relaxation of the CFRP one-way plate 3.

[0068] The self-pre-tightening multi-layer CFRP unidirectional plate-cable tensioning anchorage of the present invention features a symmetrical self-anchoring design with a group of holes on the anchor block. Each hole contains a single extrusion plate, which forms a compressive force with the sidewall of the hole in the radial direction toward the center of the anchor block, thereby clamping the CFRP unidirectional plate and anchoring it using friction. The multiple extrusion holes are arranged symmetrically around the circumference, optimizing the stress distribution within the anchor block. In use, the top pressure member presses against the extrusion plate to achieve pre-tightening of the CFRP unidirectional plate, forming a preset frictional force and improving the initial self-locking capability of the anchorage. The self-pre-tightening multi-layer CFRP unidirectional plate-cable tensioning anchorage of the present invention enables large-tonnage anchoring of multiple CFRP unidirectional plates. While increasing the anchoring tonnage, it reduces the volume and weight of the anchor block, thereby increasing the adaptability of the anchorage. Furthermore, the polygonal CFRP plate anchoring distribution design provides similar wind vibration characteristics in all directions, making it more suitable for cable-stayed bridges, suspension bridges, and spatial cable structures.

[0069] The self-pre-tightening multi-layer CFRP unidirectional plate-cable tensioning anchorage of the present invention achieves one-time anchoring of multi-layer CFRP unidirectional plates, significantly improving efficiency. The compressive forces generated during anchoring within the anchor blocks can self-balance, resulting in higher efficiency than a single anchor. Compared to a single CFRP plate, the group anchors of the multi-layer CFRP unidirectional plates in the self-pre-tightening multi-layer CFRP unidirectional plate-cable tensioning anchorage of the present invention have greater stiffness and less deformation. The compressive forces between the groups of holes interact, resulting in uniform pressure on the CFRP unidirectional plates, further improving efficiency and making it more economical than a group of independent anchors.

[0070] The integrated anchor block of the self-pre-tightening multi-layer CFRP unidirectional plate cable tensioning anchor of the present invention can be externally machined for use in building structure connection assembly.

[0071] The self-pre-tightening multi-layer CFRP unidirectional plate and cable tensioning anchor of the present invention has mutually balanced forces in the circumferential direction of the anchor block. The widths of the multi-layer CFRP unidirectional plates are different, and the cross-sections are symmetrical, resulting in better theoretical efficiency.

[0072] The self-pre-tightening multi-layer CFRP unidirectional plate cable tensioning anchor of the present invention can be installed in one construction. After the CFRP unidirectional plate cable is tensioned, the position of the top pressure member is adjusted to press against the CFRP unidirectional plate tensioning, thereby locking the CFRP unidirectional plate. The entire anchor is permanently embedded in the building structure, and the top pressure member acts as a sealing member to close the receiving groove, thereby improving the durability and protection of the entire anchor.

[0073] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A self-pre-tightening multi-layer CFRP unidirectional plate-cable tensioning anchor, characterized in that, include: An anchor block has an inlet end and an outlet end opposite to each other. The outlet end has a receiving groove, and the inlet end has multiple extrusion holes. The multiple extrusion holes are equally spaced along the circumferential direction of the center of the plane of the anchor block. Each extrusion hole includes multiple channels that penetrate the bottom of the receiving groove. The multiple channels are arranged radially along the center of the plane, and each channel is arranged circumferentially along the center of the plane. The diameter of the multiple channels in each extrusion hole group gradually increases from the center of the plane towards the outer edge of the anchor block. A compression insert, the shape of which is adapted to the shape of the inner cavity of the channel, one end of which is movably inserted into the channel, and the other end of which extends into the receiving groove, forming a clamping space between one side of the compression insert and one side wall of the channel; the compression insert has a first end and a second end opposite to each other, and the thickness of the compression insert gradually increases from the first end to the second end; the compression insert has a planar side and a sloped side opposite to each other, and the sloped side is set at an angle to the planar side; the inclination angle θ of the sloped side satisfies formula (1), formula (1): Wherein, μ1 is the coefficient of friction between the CFRP one-way plate and the inner wall of the channel; μ2 is the coefficient of friction between the extrusion insert plate and the inner wall of the channel; A CFRP unidirectional plate is inserted into each clamping space of the multiple extrusion hole groups; A top pressure member, which is adjustablely installed in the receiving groove, abuts against the other end of the extrusion insert in the group of extrusion holes to cause the extrusion insert to slide toward the inlet end. The extrusion insert presses the CFRP one-way plate toward the side wall of the channel, so that the CFRP one-way plate is locked to the anchor block.

2. The self-pre-tightening multi-layer CFRP unidirectional plate and cable tensioning anchor according to claim 1, characterized in that, The anchor block is cylindrical, and the outer edges of the inlet end and the outlet end of the anchor block extend along the end face direction to form reinforced flanges.

3. The self-pre-tightening multi-layer CFRP unidirectional plate and cable tensioning anchorage according to claim 1, characterized in that, The receiving groove is cylindrical, the inner wall of the receiving groove has an internal thread, the pressing member has an external thread, and the pressing member is threadedly connected to the receiving groove.

4. The self-pre-tightened multi-layer CFRP unidirectional plate and cable tensioning anchor according to claim 1, characterized in that, After the top pressing member abuts against the other end of the extrusion insert in the group of multiple extrusion holes, the frictional force f generated between the extrusion insert and the CFRP one-way plate during the abutting process of the top pressing member; Wherein, F is the pre-tightening pressure of the abutment member pressing against the extrusion plate.

5. A construction method for a self-pre-tightening multi-layer CFRP unidirectional plate cable tensioning anchor as described in any one of claims 1 to 4, characterized in that, Includes the following steps: The anchor block is fixedly installed at one end of the building component; A CFRP one-way plate is respectively inserted into each channel of the extrusion hole group at the inlet end of the anchor block; One end of a compression insert is movably inserted into the channel, and the other end of the compression insert extends into the receiving groove. A clamping space is formed between one side of the compression insert and one side wall of the channel, so that the CFRP unidirectional plate is received in the clamping space. The top pressure component is installed in the receiving groove of the anchor block; Adjust the position of the top pressure member in the receiving groove so that the top pressure member abuts against the other end of the extrusion insert plate in the group of multiple extrusion holes so that the extrusion insert plate slides toward the entrance end of the anchor block. The extrusion insert plate presses the CFRP one-way plate toward the side wall of the channel so that the CFRP one-way plate is locked to the anchor block to achieve the pre-tightening self-anchoring of the CFRP one-way plate. The CFRP unidirectional plate is tensioned while the position of the top pressure member in the receiving groove is adjusted so that the top pressure member abuts against the other end of the extrusion insert plate in the group of multiple extrusion holes to prevent stress relaxation of the CFRP unidirectional plate.

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