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

Abstract

The application discloses a kind of self-prestressed multi-piece CFRP unidirectional plate cable tensioning anchorage devices and construction methods thereof, the hole group on its anchor block adopts matrix type self-anchoring design, single extrusion insert plate is arranged in each hole, and the side wall of extrusion insert plate and hole forms extrusion force in the thickness direction towards CFRP unidirectional plate, so as to clamp CFRP unidirectional plate and anchor using friction, and optimize stress distribution in anchor block.In use, a preset friction force is formed by pressing extrusion insert plate with top pressure piece to realize extrusion pre-tightening of CFRP unidirectional plate, and the initial self-locking capacity of anchorage device is improved.The self-prestressed multi-piece CFRP unidirectional plate cable tensioning anchorage device of the application realizes large-tonnage anchoring of multi-piece CFRP unidirectional plate, reduces the volume and dead weight of anchor block while increasing anchoring tonnage.The application solves the problem that existing CFRP anchoring system is mostly single-layer (single-piece) anchoring in building construction, and it is difficult to realize large-tonnage anchoring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field, and particularly relates to a self-prestressed multi-piece CFRP unidirectional plate cable tensioning anchorage device and a construction method thereof. BACKGROUND

[0002] At present, the lightweight and high strength of carbon fiber reinforced plastic (CFRP) provides a new possibility for the selection of cable materials, especially in the space structure cable system and bridge cable engineering. Compared with CRRP bars, CFRP plates can provide a relatively large surface area, which is beneficial to the designability of the anchorage device.

[0003] A well-designed CFRP unidirectional plate anchoring system is the key to fully exert the superior tensile properties of the CFRP plate. The existing CFRP anchoring system is mostly single-layer (single-piece) anchoring, which is difficult to achieve large-tonnage anchoring. Increasing the number of anchorage devices to increase the anchoring tonnage will significantly increase the volume of the anchoring system, thereby limiting its application in engineering. Therefore, a small and efficient multi-layer (multi-piece) CFRP plate anchoring system is urgently needed in actual engineering.

[0004] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present application and should not be taken as an acknowledgment or any form of suggestion that this information forms prior art that is publicly known. SUMMARY

[0005] In order to overcome the defects of the prior art, a self-prestressed multi-piece CFRP unidirectional plate cable tensioning anchorage device and a construction method thereof are provided to solve the problem that the existing CFRP anchoring system is mostly single-layer (single-piece) anchoring, which is difficult to achieve large-tonnage anchoring in building construction.

[0006] To achieve the above-mentioned purpose, a self-prestressed multi-piece CFRP unidirectional plate cable tensioning anchorage device is provided, comprising:

[0007] An anchor block has an inlet end and an outlet end opposite to each other, the outlet end is provided with a receiving groove, and the inlet end is provided with a plurality of extrusion hole groups arranged in a matrix, each extrusion hole group comprises a plurality of hole channels, the hole channels penetrate the groove bottom of the receiving groove, a plurality of hole channels are arranged at equal intervals, and the hole diameter of the hole channels gradually decreases from the outlet end to the inlet end;

[0008] An extrusion insert plate is shaped to fit the shape of the inner cavity of the hole channel, one end of the extrusion insert plate is movably inserted into the hole channel, the other end of the extrusion insert plate extends into the receiving groove, and a clamping space is formed between one side of the extrusion insert plate and one side wall of the hole channel;

[0009] CFRP unidirectional plate, each of a plurality of said extrusion hole groups is inserted with a said CFRP unidirectional plate in each clamping space;

[0010] The top pressure piece is adjustably installed in the accommodating groove, and the top pressure piece abuts against the other end of the extrusion insert plate in a plurality of said extrusion hole groups to make the extrusion insert plate slide towards the entrance end, and the extrusion insert plate extrudes the CFRP unidirectional plate towards the side wall of the hole channel, so that the CFRP unidirectional plate is locked to the anchor block.

[0011] Further, the anchor block is cylindrical, and the outer edges of the entrance end and the exit end of the anchor block are respectively extended along the end face direction to form reinforcing flanges.

[0012] Further, the accommodating groove is cylindrical, and the inner wall of the accommodating groove is formed with an internal thread, and the top pressure piece is formed with an external thread, and the top pressure piece is threadedly connected to the accommodating groove.

[0013] Further, the extrusion insert plate has opposite first and second ends, and the plate thickness of the extrusion insert plate gradually increases from the first end to the second end.

[0014] Further, the extrusion insert plate has opposite planar and inclined sides, and the inclined side is arranged at an angle to the planar side.

[0015] Further, the inclination angle θ of the inclined side satisfies formula (1), and the formula (1) is:

[0016]

[0017] Wherein, μ1 is the friction coefficient between the CFRP unidirectional plate and the inner wall of the hole channel;

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

[0019] Further, after the top pressure piece abuts against the other end of the extrusion insert plate in a plurality of said extrusion hole groups, the friction force f generated between the extrusion insert plate and the CFRP unidirectional plate during the abutting process of the top pressure piece;

[0020]

[0021] Wherein, F is the pre-tightening pressure of the abutting piece against the extrusion insert plate.

[0022] The present application provides a construction method of a self-pre-tightening multi-piece CFRP unidirectional plate cable tensioning anchor device, characterized in that it comprises the following steps:

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

[0024] A CFRP unidirectional plate is respectively arranged in each hole of the extrusion hole group at the inlet end of the anchor block;

[0025] One end of an extrusion plug is movably inserted into the hole, and the other end of the extrusion plug extends into the accommodating groove, and a clamping space is formed between one side wall of the hole and one side of the extrusion plug, so that the CFRP unidirectional plate is accommodated in the clamping space;

[0026] A pressing member is installed in the accommodating groove of the anchor;

[0027] The position of the pressing member in the accommodating groove is adjusted, so that the pressing member abuts against the other end of the extrusion plug in the extrusion hole group to make the extrusion plug slide towards the inlet end of the anchor block, the extrusion plug extrudes the CFRP unidirectional plate towards the one side wall of the hole, so that the CFRP unidirectional plate is locked to the anchor block to achieve the pre-tightening self-anchoring of the CFRP unidirectional plate;

[0028] The CFRP unidirectional plate is tensioned, and the position of the pressing member in the accommodating groove is adjusted, so that the pressing member abuts against the other end of the extrusion plug in the extrusion hole group to prevent stress relaxation of the CFRP unidirectional plate.

[0029] The self-pre-tightening multi-piece CFRP unidirectional plate cable tensioning anchor of the present application has the following beneficial effects: the hole group on the anchor block adopts a matrix self-anchoring design, a single extrusion plug is arranged in each hole, the extrusion plug and the side wall of the hole form extrusion force in the thickness direction of the CFRP unidirectional plate, thereby clamping and anchoring the CFRP unidirectional plate by friction, and optimizing the stress distribution in the anchor block. In use, the extrusion pre-tightening of the CFRP unidirectional plate is realized by the pressing of the extrusion plug against the extrusion plug, a preset friction force is formed, and the initial self-locking capacity of the anchor is improved. The self-pre-tightening multi-piece CFRP unidirectional plate cable tensioning anchor realizes large-tonnage anchoring of multiple CFRP unidirectional plates, and reduces the volume and self-weight of the anchor block while increasing the anchoring tonnage. BRIEF DESCRIPTION OF DRAWINGS

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

[0031] Figure 1 The structure of the self-pre-tightening multi-piece CFRP unidirectional plate cable tensioning anchor of the present application is shown in the figure.

[0032] Figure 2This is an exploded structural diagram of a self-pre-tightened multi-piece 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-tightening multi-piece CFRP unidirectional plate cable tensioning anchor, comprising: anchor block 1, extrusion insert 2, CFRP unidirectional plate 3 and top pressure member 4.

[0040] In this embodiment, the anchor block is integrally formed by external machining. Specifically, the anchor block 1 has an inlet end and an outlet end. The outlet end of the anchor block 1 has a receiving groove a. The inlet end of the anchor block 1 has multiple extrusion hole groups B. The multiple extrusion hole groups B are arranged in a matrix. Each extrusion hole group B includes multiple channels b. Preferably, each extrusion hole group includes four channels, wherein the four channels are divided into two groups, and the two channels in each group are spaced apart. The channels b penetrate the bottom of the receiving groove a. The multiple channels b are equally spaced. The diameter of the channels gradually decreases from the outlet end to the inlet end. The cross-section of the channel is rectangular. The length of the cross-section of the channel b gradually decreases from the outlet end to the inlet end 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. One end of the extrusion plate 2 is movably inserted into the channel b. The other end of the extrusion plate 2 extends into the receiving groove a. A clamping space is formed between one side of the extrusion plate 2 and one side wall of the channel b.

[0043] A CFRP unidirectional plate 3 is inserted in each clamping space of the multi-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, causing the extrusion plate 2 to slide toward the inlet end. As the extrusion plate 2 slides toward the inlet end, the extrusion plate 2 presses against the side wall of the hole b, causing the CFRP one-way plate 3 to be locked to the anchor block 1.

[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] As a preferred embodiment, the extrusion plug 2 has a first end and a second end opposite to each other in the length direction of the extrusion plug 2. The thickness of the extrusion plug 2 gradually increases from the first end of the extrusion plug 2 to the second end of the extrusion plug 2. The gradually changing thickness of the extrusion plug 2 is a variable-diameter plate.

[0051] As a preferred embodiment, the extrusion plug 2 has a planar side c and an inclined side d opposite to each other in the thickness direction of the extrusion plug 2. The inclined side d is arranged at an angle to the planar side c. The inclination angle θ of the inclined side d, i.e. the included angle between the inclined side d and the planar side c.

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

[0053]

[0054] wherein, in the present embodiment, the inclination angle θ of the inclined side d is 2.86°, μ1 is the friction coefficient between the CFRP unidirectional plate 3 and the inner wall of the hole b, and the friction coefficient is 0.3; μ2 is the friction coefficient between the extrusion plug 2 and the inner wall of the hole b, and the friction coefficient is 0.1.

[0055] In addition, after the pressing member 4 presses against the other end of the extrusion plug 2 in the plurality of extrusion hole groups B, the friction force f between the extrusion plug 2 and the CFRP unidirectional plate 3 generated during the pressing process of the pressing member 4;

[0056]

[0057] wherein, F is the pre-tightening pressure of the pressing member pressing against the extrusion plug 2.

[0058] The diameters of the anchor block from bottom to top (from the inlet end of the anchor block to the outlet end of the anchor block) are 270 mm, 210 mm, and 230 mm, respectively, and the heights are 50 mm, 150 mm, and 100 mm, respectively. The inside of the anchor block is provided with hole groups according to the number of CFRP unidirectional plates to be anchored.

[0059] In the present embodiment, four extrusion hole groups are arranged in the anchor block, and the four extrusion hole groups are arranged in a rectangular manner. Each hole group includes four hole channels, and the four hole channels have the same size. The four hole channels are divided into two groups, and each group has two hole channels. The two groups of hole channels are arranged at intervals. The adjacent hole channels are spaced apart by about 10 mm to ensure the strength of the anchor block. An extrusion plug is arranged in each hole channel. The extrusion plug and the side wall of the hole channel in the thickness direction of the extrusion plug extrude each other, thereby frictionally anchoring the CFRP unidirectional plate. Meanwhile, the hole groups on the equal sides of the anchor block are symmetrically arranged, thereby optimizing the stress distribution in the anchor.

[0060] The length of the hole is equal to or slightly greater than the width of the CFRP unidirectional plate 50mm. The size of the hole connected to the bottom of the accommodating groove is 10mm*50mm, and the size of the hole is greater than the size of the CFRP unidirectional plate by 2mm, while ensuring the stiffness of the intersection of the guide section and the actuating section of the extrusion plug plate.

[0061] The specific size of the extrusion plug plate is as shown in the table (unit: mm), the width of the extrusion plug plate and the angle of the inclined side are completely matched with the hole, and the length of the extrusion plug plate is greater than the axial hole depth of the hole, so that the pre-tightening force can be easily applied. Figure 6

[0062] The present application provides a construction method of a self-pre-tightening multi-piece CFRP unidirectional plate cable tensioning anchor, comprising the following steps:

[0063] The anchor block 1 is fixedly installed at one end of the building component;

[0064] A CFRP unidirectional plate 3 is respectively arranged in each hole b of the extrusion hole group B on the inlet end of the anchor block 1;

[0065] One end of an extrusion plug plate 2 is movably inserted into the hole b, the other end of the extrusion plug plate 2 extends into the accommodating groove a, and the side of the extrusion plug plate 2 and the side wall of the hole b form a clamping space, so that the CFRP unidirectional plate 3 is accommodated in the clamping space;

[0066] A pressing piece 4 is installed in the accommodating groove a of the anchor;

[0067] The position of the pressing piece 4 in the accommodating groove a is adjusted, so that the pressing piece 4 abuts against the other end of the extrusion plug plate 2 in the multi-extrusion hole group B to make the extrusion plug plate 2 slide towards the inlet end of the anchor block 1, the extrusion plug plate 2 extrudes the CFRP unidirectional plate 3 towards the side wall of the hole b, so that the CFRP unidirectional plate 3 is locked to the anchor block 1 to realize the pre-tightening self-anchoring of the CFRP unidirectional plate 3;

[0068] The CFRP unidirectional plate 3 is tensioned, and the position of the pressing piece 4 in the accommodating groove a is adjusted, so that the pressing piece 4 abuts against the other end of the extrusion plug plate 2 in the multi-extrusion hole group B to prevent stress relaxation of the CFRP unidirectional plate 3.

[0069] ​The self-pre-tightening multi-piece CFRP unidirectional plate cable tensioning anchor of the application adopts a matrix self-anchoring design for the hole groups on the anchor block, a single extrusion insert plate is arranged in each hole, the extrusion insert plate and the sidewall of the hole form an extrusion force in the thickness direction of the CFRP unidirectional plate, thereby clamping the CFRP unidirectional plate and anchoring by friction, and the stress distribution in the anchor block is optimized. In use, the CFRP unidirectional plate is extruded and pre-tightened by the top pressure piece pressing against the extrusion insert plate to form a preset friction force, thereby improving the initial self-locking capacity of the anchor. The self-pre-tightening multi-piece CFRP unidirectional plate cable tensioning anchor of the application realizes large-tonnage anchoring of multiple CFRP unidirectional plates, while increasing the anchoring tonnage, the volume and self-weight of the anchor block are reduced, thereby increasing the adaptability of the anchor, which can be applied to cable-stayed bridges, suspension bridges and spatial cable structures.

[0070] The self-pre-tightening multi-piece CFRP unidirectional plate cable tensioning anchor of the application realizes one-time anchoring of multiple layers of CFRP unidirectional plates, the efficiency is greatly improved, and the extrusion forces generated by the anchoring inside the anchor block can be self-balanced, which is higher than the efficiency of single anchoring. Compared with a single CFRP plate, the rigidity of the group anchor of the multiple layers of CFRP unidirectional plates of the self-pre-tightening multi-piece CFRP unidirectional plate cable tensioning anchor of the application is large, the deformation is small, the extrusion forces between the hole groups interact, the pressure of the CFRP unidirectional plates is uniform, the efficiency is better, and the anchor is more economical than a group of independent anchors.

[0071] The integrated anchor block of the group anchor of the multiple layers of CFRP unidirectional plates of the self-pre-tightening multi-piece CFRP unidirectional plate cable tensioning anchor of the application can be externally machined for building structure connection assembly.

[0072] The self-pre-tightening multi-piece CFRP unidirectional plate cable tensioning anchor of the application is installed by one-time construction, after the CFRP unidirectional plate cable is tensioned, the position of the top pressure piece is adjusted to press against the CFRP unidirectional plate tensioning, thereby locking the CFRP unidirectional plate, the entire anchor is buried in the building structure as a permanent structure, the top pressure piece serves as a sealing element for sealing the containing groove, and the durability and protection of the entire anchor are improved.

[0073] The above description is only the preferred embodiment of the application and the explanation of the applied technical principles. It should be understood by those skilled in the art that the application range involved in the application is not limited to the technical solutions formed by the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or equivalent features without departing from the inventive concept. For example, the technical solutions formed by replacing the above features with the technical features disclosed in the application (but not limited to) having similar functions.

Claims

1. A self-prestressing multi-piece CFRP unidirectional plate cable tensioning anchorage, characterized in that, The application relates to an anchor block, an extrusion plug and a CFRP unidirectional plate. The anchor block has opposite inlet and outlet ends, the outlet end is provided with a containing groove, the inlet end is provided with a plurality of extrusion hole groups arranged in a matrix, each of the extrusion hole groups comprises a plurality of hole channels, the hole channels penetrate through the groove bottom of the containing groove, the hole channels are arranged at equal intervals, and the hole diameters of the hole channels gradually decrease from the outlet end to the inlet end. The extrusion plug is movably inserted into the hole channel, the other end of the extrusion plug extends into the containing groove, and a clamping space is formed between one side of the extrusion plug and one side wall of the hole channel. The extrusion plug has opposite first and second ends, the plate thickness of the extrusion plug gradually increases from the first end to the second end. The extrusion plug has opposite planar and inclined sides, the inclined side is arranged at an angle with the planar side. The CFRP unidirectional plate is inserted into each clamping space of the plurality of extrusion hole groups.

2. The self-prestressing multi-strand CFRP unidirectional sheet cable tensioning anchorage according to claim 1, characterized in that, The top pressing piece is movably installed in the containing groove of the anchor block, and the other end of the extrusion plug is abutted against the top pressing piece to make the extrusion plug slide towards the inlet end.

3. The self-prestressing multi-strand CFRP unidirectional sheet cable tensioning anchorage device according to claim 1, characterized in that, The anchor block is cylindrical, and reinforcing flanges are formed on the outer edges of the inlet and outlet ends along the end face directions.

4. The self-prestressing multi-strand CFRP unidirectional sheet cable tensioning anchorage device according to claim 1, characterized in that, The containing groove is cylindrical, the inner wall of the containing groove is provided with an internal thread, the top pressing piece is provided with an external thread, and the top pressing piece is threadedly connected to the containing groove. The friction force f between the extrusion plug and the CFRP unidirectional plate is generated during the abutting process of the top pressing piece.

5. A construction method of the self-prestressing multi-plate CFRP unidirectional cable tension anchor according to any one of claims 1 to 4, characterized in that, The application further relates to a method for fixing a building component. The anchor block is fixedly installed at one end of a building component. A CFRP unidirectional plate is inserted into each hole channel of the extrusion hole groups on the inlet end of the anchor block. One end of the extrusion plug is movably inserted into the hole channel, the other end of the extrusion plug extends into the containing groove, and a clamping space is formed between one side of the extrusion plug and one side wall of the hole channel. The top pressing piece is installed in the containing groove of the anchor block. Adjusting the position of the top pressing piece in the accommodating groove, so that the top pressing piece abuts against the other end of the extrusion insert plate in the plurality of extrusion hole groups to make the extrusion insert plate slide towards the entrance end of the anchor block, and the extrusion insert plate extrudes the CFRP unidirectional plate towards the one side wall of the hole, so that the CFRP unidirectional plate is locked to the anchor block to achieve the pre-tightening self-anchoring of the CFRP unidirectional plate; Tensioning the CFRP unidirectional plate, while adjusting the position of the top pressing piece in the accommodating groove, so that the top pressing piece abuts against the other end of the extrusion insert plate in the plurality of extrusion hole groups to prevent stress relaxation of the CFRP unidirectional plate.

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