CN110029593B

CN110029593B - Stretching and anchoring device for multilayer prestressed fiber cloth reinforced beam

Info

Publication number: CN110029593B
Application number: CN201910295755.1A
Authority: CN
Inventors: 卢春玲; 李柏林; 王强; 朱万旭
Original assignee: Guilin University of Technology
Current assignee: Guilin University of Technology
Priority date: 2019-04-12
Filing date: 2019-04-12
Publication date: 2020-12-22
Anticipated expiration: 2039-04-12
Also published as: CN110029593A

Abstract

The invention discloses a stretching and anchoring device for a multilayer prestressed fiber cloth reinforced beam. Comprises a fixed end support, a tensioning end support, a fixed end anchorage, a tensioning end anchorage, a clamping piece, an anchoring long screw, an anchoring short screw, a chemical bolt, fiber cloth, a prestress applying frame and a jack. The fixed end support and the tensioning end support are T-shaped bodies, and the fixed end anchorage and the tensioning end anchorage are cuboid. The fixed end support and the tensioning end support are fixed on the beam to be reinforced through chemical anchor bolts. The fixed end anchorage device is connected with the fixed end support through the anchoring short screw rod. The tension end anchorage device is connected with the tension end support through the anchoring long screw rod. The fiber cloth is clamped by the two clamping pieces and wedged into the wedge-shaped through seam in the anchor at the tensioning end, so that the fiber cloth is anchored. The tensioning and anchoring device is simple in structure, convenient to operate, even in stress of the multi-layer fiber cloth, capable of applying high prestress, and reusable in prestress applying frame.

Description

Stretching and anchoring device for multilayer prestressed fiber cloth reinforced beam

Technical Field

The invention relates to a stretching and anchoring device for a multilayer prestressed fiber cloth reinforced beam, which can be used for reinforcing a concrete beam and belongs to the field of building bridge engineering reinforcement.

Background

The fiber composite reinforced material has the characteristics of high unidirectional tensile strength, light weight, high elastic modulus, small volume, corrosion resistance and the like, and the cross section and the load of the original structural member are not greatly increased after the reinforcement, so the fiber composite reinforced material is widely applied to the reinforcement of a concrete structure. In the prior art, a non-prestressed reinforcement method is mostly adopted, or a single-layer prestressed fiber cloth is only adopted to reinforce a concrete structure, and the tensioning and anchoring devices for reinforcing the concrete beam by the multi-layer prestressed fiber cloth are fewer and the applied prestress is smaller.

The patent application with publication number CN 106013835 a discloses a multi-layer carbon fiber cloth tensioning and anchoring device and method for reinforcing concrete structure, the device is used for reinforcing the multi-layer carbon fiber cloth and has the following defects: 1. in the process of winding the carbon fiber cloth, the lengths of the layers of the fiber cloth are not easy to be equal; 2. the device is comparatively loaded down with trivial details to carbon cloth's tensioning equipment, and the tensioning end screw rod is longer, and the fibre cloth slides great after applying prestressing force, and anchoring nature is relatively poor.

Disclosure of Invention

The invention aims to provide a tensioning and anchoring device for a multi-layer prestressed fiber cloth reinforced beam. The device adopts clamping piece and wound form ground tackle, and its structural stress is more reasonable, can bear great prestressing force, guarantees that each layer fibre cloth is isometric and the anchor is effectual, can make full use of the performance of fibre cloth.

The problems of unequal lengths of the multiple layers of fiber cloth, uneven stress, complicated construction method and low anchoring efficiency exist in the multi-layer prestressed fiber cloth reinforced concrete structure, and in order to solve the problems, the technical scheme adopted by the invention is as follows:

a tensioning and anchoring device for a multi-layer prestressed fiber cloth reinforced beam comprises a fixed end support, a tensioning end support, a fixed end anchor, a tensioning end anchor, two clamping pieces, two anchoring short screws, two anchoring long screws, eight chemical bolts, fiber cloth, a prestressed applying frame and a jack.

The fixed end support is a T-shaped body, four oval through holes I for mounting chemical bolts are formed in the fixed end support, and circular anchor holes I for connecting the fixed end anchor are formed in two sides of the fixed end support.

The tensioning end support is a T-shaped body, four oval through holes II for mounting chemical bolts are formed in the tensioning end support, two sides of the tensioning end support are respectively provided with a round anchor hole II for connecting with a tensioning end anchor, and a trapezoidal baffle is arranged on the tensioning end support and used for abutting against a jack.

The anchor body is composed of two sleeve plates, namely a sleeve plate I and a sleeve plate II, and a rectangular through seam I is arranged between the sleeve plate I and the sleeve plate II.

The tensioning end anchorage device is in a cuboid shape, and the anchor ends are respectively provided with a circular anchor hole IV used for being connected with the fixed end support; the round anchor hole IV of the anchor at the tensioning end consists of a hexagonal hole and a round hole, and the depth of the hexagonal hole is equal to the sum of the thickness of the hexagonal bulge of the prestress applying frame and the thickness of the anchor head of the anchoring long screw rod; the anchor body of the tensioning end anchorage device consists of a sleeve plate and two wedge-shaped plates, namely a sleeve plate III, a wedge-shaped plate I and a wedge-shaped plate II; a rectangular through seam II is arranged between the sleeve plate III and the wedge-shaped plate I, and a wedge-shaped through seam is arranged between the wedge-shaped plate I and the wedge-shaped plate II and used for inserting the clamping piece.

The clamping pieces are wedge-shaped blocks, the fiber cloth is clamped between the two clamping pieces and wedged into the wedge-shaped through seam in the anchor at the tensioning end, and the end of the fiber cloth is fixed.

The fixed end support, the tensioning end support, the fixed end anchorage, the tensioning end anchorage and the clamping piece are made of Q235B grade or above high-quality steel; the anchoring short screw and the anchoring long screw are both 12.9-grade high-strength anchor rods, and the shearing stress resistance grade of the anchor rods is 12.9 GPa.

The prestress applying frame is a door-shaped frame made of Q235B grade or above high-quality steel, hexagonal protrusions are arranged at two ends of the door-shaped opening end of the prestress applying frame and used for being clamped into hexagonal holes at two ends of an anchorage device at a tensioning end, and a baffle is arranged at the tail of the prestress applying frame and used for abutting against a piston of a jack.

The jack is a hydraulic jack, and the front end of the jack is a piston.

Compared with the prior art, the application can obtain the following technical effects:

1. the reinforcing device adopts a reinforcing method combining winding and clip anchoring, and can effectively solve the problem that the fiber cloth of each layer is unequal in length in the reinforcing process of the multi-layer fiber cloth; and by utilizing the pulley lever principle, the total prestress is uniformly distributed on each layer of fiber cloth, so that the force at the anchoring position of the clamping piece is reduced, and the anchoring reliability is greatly improved.

2. By adopting the combination of the tension end anchorage and the fixed end anchorage, the construction of the prestressed fiber cloth reinforced beam with even number of layers above 4 can be conveniently realized.

3. After the prestressed fiber cloth reinforcing device is used for tensioning and anchoring the fiber cloth, the reinforcing effect is good, the prestress loss is small, and the appearance of the reinforced concrete beam after being reinforced is not changed greatly.

4. The prestressed fiber cloth tensioning device is simple in structure and convenient to operate. The prestress is applied to the fiber cloth by the jack, and compared with a prestress application mode of manually screwing the tension screw, the prestress application efficiency and the prestress application size are obviously improved. And the tensioning device can be recycled, and the economy is better.

Drawings

Fig. 1 is a schematic view of the overall structure of a prestressed fiber cloth reinforced concrete beam tensioning and anchoring device.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a front view of fig. 2.

FIG. 4 is a schematic view of a fixed end mount.

Fig. 5 is a schematic view of a tension end support.

FIG. 6 is a schematic view of a fixed end anchor.

Fig. 7 is a front view of fig. 6.

Fig. 8 is a top view and a partial cross-sectional view of fig. 6.

FIG. 9 is a front view of a tension end anchor and clip.

FIG. 10 is a rear view of the tension end anchor and clip.

FIG. 11 is a top view and partial cross-sectional view of a tension end anchor.

FIG. 12 is a schematic view of a tensioning end anchor, clamping piece, anchoring long screw and tensioning end support.

Fig. 13 is a front view of fig. 12.

Fig. 14 is a schematic view of an anchor short screw and an anchor long screw.

Fig. 15 is a schematic view of a chemical bolt.

FIG. 16 is a schematic view of the wound combination of the tension end anchorage, the fixed end anchorage and the fiber cloth.

Fig. 17 is a top view of fig. 16.

FIG. 18 connecting step of fiber cloth with tension end anchorage and fixed end anchorage

Schematic representation.

FIG. 19 connecting step of fiber cloth with tension end anchorage and fixed end anchorage

Schematic diagram of。

FIG. 20 connecting step of fiber cloth with tension end anchorage and fixed end anchorage

Schematic representation.

FIG. 21 connecting step of fiber cloth with tension end anchorage and fixed end anchorage

Schematic representation.

FIG. 22 connecting step of fiber cloth with tension end anchorage and fixed end anchorage

Schematic representation.

FIG. 23 connecting step of fiber cloth with tension end anchorage and fixed end anchorage

-

Schematic representation.

FIG. 24 is a schematic view showing the completion of the connection of the fiber cloth to the tension end anchorage and the fixed end anchorage.

FIG. 25 is a schematic view of a prestressing force applying frame and jacks.

FIG. 26 is a schematic view of the installation of the fixed end support and the tensile end support of the prestressed fiber cloth reinforced concrete beam.

Fig. 27 is a schematic view of a prestressing force applying process of the prestressed fiber cloth reinforced concrete beam.

Fig. 28 is a schematic view showing the completion of reinforcement of a prestressed fiber cloth reinforced concrete beam.

The labels in the figure are:

1A-a fixed end support, 1A 1-an oval through hole I, 1A 2-a circular anchor hole I; 1B-a tensioning end support, 1B 1-an oval through hole II, 1B 2-a round anchor hole II and 1B 3-a trapezoidal baffle; 2A-a fixed end anchorage device, 2A 1-a circular anchorage hole III, 2A 21-a sleeve plate I, 2A 22-a sleeve plate II and 2A 2-a rectangular through seam I; 2B-tensioning end anchorage, 2B 1-circular anchor holes IV, 2B 11-hexagonal holes and 2B 12-circular holes; 2B 21-sleeve plate III, 2B 31-wedge-shaped plate I, 2B 32-wedge-shaped plate II and 2B 2-rectangular through seam II; 2B 3-wedge shaped hole; 3-a clamping piece; 4-prestress application frame, 41-hexagonal convex body and 42-baffle plate; jack, 51-piston; 6A-anchoring short screw rod, 6B-anchoring long screw rod; 7-chemical bolt; 8-fiber cloth; 9-concrete beam.

Detailed Description

The invention is described in detail below with reference to the drawings and the detailed description.

Example (b):

as shown in fig. 1 to 28, in this embodiment, by using the tensioning and anchoring device for a multi-layer prestressed carbon fiber cloth reinforced beam of the present invention, a reinforced concrete beam is used as a reinforced object, eight layers of prestressed carbon fiber cloth are used to reinforce the reinforced concrete beam, and the width of the carbon fiber cloth is 150mm, which is specifically as follows:

a stretching and anchoring device of a multilayer prestressed fiber cloth reinforced beam comprises a fixed end support 1A, a stretching end support 1B, a fixed end anchor 2A, a stretching end anchor 2B, two clamping pieces 3, two anchoring short screw rods 6A, two anchoring long screw rods 6B, eight chemical bolts 7, fiber cloth 8, a prestressed applying frame 4 and a jack 5.

As shown in fig. 4, the fixed end holder 1A is a T-shaped body. Four oval through holes I1A 1 for mounting chemical bolts 7 are provided, and two sides are respectively provided with a circular anchor hole I1A 2 for connecting with a fixed end anchor 2A.

As shown in fig. 5, the tensioning end support 1B is a T-shaped body. Four oval through holes II 1B1 for installing chemical bolts 7 are arranged on the lifting jack, two sides of the lifting jack are respectively provided with a round anchor hole II 1B2 for connecting with a tensioning end anchor 2B, and a trapezoidal baffle plate 1B3 for abutting against the lifting jack 5 is arranged on the lifting jack.

As shown in fig. 6 to 8, the fixed-end anchorage 2A has a rectangular parallelepiped shape. The anchor end respectively has a circular anchor eye III 2A1 that is used for linking to each other with fixed end support 1A, and the anchor body comprises two lagging, is lagging I2A21 and lagging II2A22 respectively, has a rectangle to lead to seam I2A2 between lagging I2A21 and lagging II2A 22.

As shown in fig. 9 to 11, the tension-end anchorage 2B has a rectangular parallelepiped shape. The anchor ends each have a circular anchor opening IV 2B1 for connection to the fixed end support 1B. The round anchor hole IV 2B1 of the tension end anchor 2B consists of a hexagonal hole 2B11 and a round hole 2B12, and the depth of the hexagonal hole 2B11 is equal to the sum of the thickness of the hexagonal bulge 41 of the prestress applying frame 4 and the thickness of the anchor head 6B1 of the anchor long screw 6B. The anchor body of the tension end anchor 2B consists of a sleeve plate III 2B21, a wedge plate I2B 31 and a wedge plate II 2B 32. A rectangular through seam II 2B2 is arranged between the sleeve plate III 2B21 and the wedge plate I2B 31, and a wedge-shaped through seam 2B3 is arranged between the wedge plate I2B 31 and the wedge plate II 2B32 and used for inserting the clamping piece 3.

The clamping pieces 3 are wedge-shaped blocks, the fiber cloth 8 is clamped between the two clamping pieces 3 and wedged into the wedge-shaped through seam 2B3 in the tensioning end anchorage device 2B, and the fiber cloth 8 is anchored.

The fixed end support 1A, the tensioning end support 1B, the fixed end anchorage 2A, the tensioning end anchorage 2B and the clamping piece 3 are made of Q235B grade or above high-quality steel. The anchoring short screw 6A and the anchoring long screw 6B both adopt 12.9-grade high-strength anchor rods, and the shearing stress resistance grade of the anchor rods is 12.9 GPa.

As shown in fig. 25, the prestress applying frame 4 is a portal frame made of high-quality steel material of grade Q235B or more. The two ends of the door-shaped opening end are respectively provided with a hexagonal convex body 41 which is used for being clamped into hexagonal holes 2B11 at the two ends of the tensioning end anchorage device 2B, and the tail part of the door-shaped opening end is provided with a baffle plate 42 which is used for abutting against a piston 51 of a jack 5.

The jack 5 is a hydraulic jack, and the front end of the jack is a piston 51.

The anchoring and tensioning device of the multi-layer prestressed fiber cloth reinforced beam realizes the tensioning of the fiber cloth 8 through the tensioning device of the multi-layer prestressed fiber cloth reinforced beam; the anchoring of the fiber cloth 8 is realized by the anchoring device of the prestressed fiber cloth reinforced beam.

When the reinforced concrete beam is reinforced, the method specifically comprises the following steps:

(1) and determining a reinforcing position and processing the surface of the concrete.

The step (1) as described above includes the steps of:

determining a reinforcement position on the reinforced concrete beam 9; and popping up a position range needing to be reinforced by prestressed fiber cloth on the surface of the fiber cloth by using ink lines.

And (3) polishing, filling holes and the like on the concrete surface within the reinforcing range of the reinforced concrete beam 9, and then uniformly coating an epoxy adhesive layer on the surface.

(2) The length of the required fiber cloth 8 is determined according to the length of the reinforcing member and the number of layers of the required fiber cloth, and then cut.

(3) And (3) connecting the fiber cloth cut in the step (2) with a tensioning end anchorage device and a fixed end anchorage device.

The step (3) as described above includes the steps of:

one end of the fiber cloth 8 bypasses the sleeve plate III 2B21 of the anchorage device 2B at the tensioning end, then penetrates out of the rectangular through seam II 2B2 of the anchorage device 2B at the tensioning end, and then the two ends of the fiber cloth 8 are aligned, and at the moment, one layer of fiber cloth is sleeved on the sleeve plate III 2B21 of the anchorage device 2B at the tensioning end (see fig. 18).

The ends of the fiber cloth 8 with aligned two ends pass through the rectangular through-slit I2A2 of the fixed-end anchorage 2A and then pass around the sheathing I2A21 of the fixed-end anchorage 2A, and at the moment, the two layers of fiber cloth 8 are sheathed on the sheathing I2A21 of the fixed-end anchorage (see fig. 19).

Then the fiber cloth 8 with two aligned ends is wound around the sleeve plate III 2B21 of the anchorage device 2B at the tensioning end and then penetrates out of the rectangular through seam II 2B2 of the anchorage device 2B at the tensioning end, and at the moment, three layers of fibersThe wib 8 is looped over the strap III 2B21 of the tension end anchorage 2B (see FIG. 20).

The fiber cloth 8 with two aligned ends is continuously pulled to the fixed end anchorage device 2A, passes through the rectangular through seam I2A2 of the fixed end anchorage device 2A again and then bypasses the sleeve plate II2A22 of the fixed end anchorage device 2A, and at the moment, the sleeve plate II2A22 of the fixed end anchorage device is sleeved by the two layers of fiber cloth 8. (see FIG. 21)

The fiber cloth 8 with the two aligned ends is put in from the narrow side and out from the wide side of the wedge-shaped through slot II 2B3 of the tensioning end anchorage 2B (see figure 22).

Fiber cloth bonding glue is uniformly coated on the ends of the fiber cloth 8 which penetrates out of the wide side of the wedge-shaped through seam II 2B3 and is aligned with the two ends of the fiber cloth. Meanwhile, fiber cloth bonding glue is uniformly coated on the contact surfaces 8 of the two clamping pieces 3 and the ends of the fiber cloth (see fig. 23).

Clamping the ends of the fiber cloth 8 with two aligned ends by using two clamping pieces 3, wedging the clamping pieces 3 into a wedge-shaped through seam II 2B3 of the tensioning end anchorage device 2B (see figure 23), and completing the connection of the fiber cloth 8 with the tensioning end anchorage device 2B and the fixed end anchorage device 2A after the bonding glue of the fiber cloth is cured (see figure 24).

(4) And assembling the fixed end support and the tensioning end support on the reinforcing beam.

The step (4) as described above includes the steps of:

eight chemical bolt holes for installing the fixed end support 1A and the stretching end support 1B are drilled at the reinforcing position of the beam to be reinforced,after cleaning the hole, placing a medicament tube, screwing the chemical bolt 7 into the medicament tube by using an electric drill until the medicament flows out, and completing the implantation of the chemical bolt after the gel is hardened;

the elliptical through holes i 1A1 of the fixed end support 1A and the elliptical through holes ii 1B1 of the tensile end support 1B are respectively passed through the chemical bolts 7, and then nuts on the chemical bolts 7 are tightened to fix the fixed end support 1A and the tensile end support 1B to the reinforcing beam surface (see fig. 26).

(5) And the fixed end anchorage is connected with the fixed end support.

Aligning circular anchor hole III 2A1 of fixed end anchor 2A with circular anchor hole I1A 2 of fixed end support 1A, respectively penetrating two anchor short screw rods 6A into circular anchor hole I1A 2 of fixed end support 1A and circular anchor hole III 2A1 of fixed end anchor 2A, simultaneously screwing down nuts on two anchor short screw rods 6A, and completing the connection of fixed end anchor 2A and fixed end support 1A (see fig. 27).

(6) The tension end anchorage device is connected with the tension end support.

And aligning the circular anchor holes IV 2B1 at the two ends of the anchorage device 2B at the tensioning end with the circular anchor holes II 1B2 at the two sides of the support 1B at the tensioning end. Two anchoring long screws 6B respectively penetrate through the anchor holes 2B1 of the tensioning-end anchorage, and the anchor heads 6B1 of the anchoring long screws 6B are embedded into the hexagonal holes 2B 11. And then the two anchoring long screws 6B are respectively penetrated into the circular anchor holes II 1B2 on the two sides of the tensioning end support 1B, and the nuts are screwed into the anchoring long screws 6B without screwing, so that the connection between the tensioning end anchorage device 2B and the tensioning end support 1B is completed (see figure 27).

(7) And installing a prestress applying frame and a jack, and tensioning and anchoring the fiber cloth.

The step (7) as described above includes the steps of:

the bottom of the jack 5 is tightly attached to the trapezoidal baffle 1B3 of the tensioning end support 1B, and the jack 5 is tightly attached to the bottom surface of the beam (seeSee fig. 27).

The hexagonal protrusions 41 on the door-shaped open end of the prestress applying frame 4 are snapped into the hexagonal holes 2B12 of the tension end anchors 2B, and the jack piston 51 is extended against the end stop 42 of the prestress applying frame 4.

And pushing the prestress applying frame 4 by using a jack 5 to enable the tensioning end anchorage device 2B to move towards the tensioning end support 1B connected with the tensioning end anchorage device, and applying prestress to the fiber cloth 8. When the prestress is applied to a prescribed value, the nuts on the two anchor long screws 6B are respectively tightened. The jack 5 is returned with oil, and the prestress-applying frame 4 and the jack 5 are removed.

And (3) uniformly brushing a layer of resin impregnating adhesive on the surface of the fiber cloth 8 to finish the reinforcement of the reinforced concrete beam 9 (see fig. 28).

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the invention relates may make certain modifications or additions to, or may substitute for, the described embodiments without departing from the spirit of the invention or exceeding the scope as defined in the following claims.

Claims

1. The utility model provides a stretch-draw and anchor device of multilayer prestressing force fibre cloth reinforcing beam which characterized in that: the device comprises a fixed end support (1A), a tensioning end support (1B), a fixed end anchor (2A), a tensioning end anchor (2B), two clamping pieces (3), two anchoring short screws (6A), two anchoring long screws (6B), eight chemical bolts (7), fiber cloth (8), a prestress applying frame (4) and a jack (5);

the fixed end support (1A) is a T-shaped body, four oval through holes I (1A 1) for mounting chemical bolts (7) are formed in the fixed end support, and two sides of the fixed end support are respectively provided with a circular anchor hole I (1A 2) for connecting with a fixed end anchor (2A); the middle of the fixed end support is provided with a through hole I, and the oval through holes I are uniformly distributed on two sides of the through hole I;

the tensioning end support (1B) is a T-shaped body, four oval through holes II (1B 1) for mounting chemical bolts (7) are formed in the tensioning end support, two sides of the tensioning end support are respectively provided with a circular anchor hole II (1B 2) for connecting with a tensioning end anchor (2B), and a trapezoidal baffle (1B 3) is arranged on the tensioning end support and used for abutting against a jack (5); a through hole II is formed in the middle of the tensioning end support, and the oval through holes II are uniformly distributed on two sides of the through hole II;

the anchor (2A) is cuboid, each anchor end is provided with a circular anchor hole III (2A 1) used for being connected with the fixed end support (1A), the anchor body consists of two sleeve plates which are respectively a sleeve plate I (2A 21) and a sleeve plate II (2A 22), and a rectangular through seam I (2A 2) is arranged between the sleeve plate I (2A 21) and the sleeve plate II (2A 22);

the tensioning end anchorage device (2B) is cuboid, the anchor ends are respectively provided with a round anchor hole IV (2B 1) used for being connected with the fixed end support (1B), the round anchor hole IV (2B 1) of the tensioning end anchorage device (2B) consists of a hexagonal hole (2B 11) and a round hole (2B 12), and the depth of the hexagonal hole (2B 11) is equal to the sum of the thickness of a hexagonal bulge body (41) of the prestress applying frame (4) and the thickness of an anchor head (6B 1) of the anchoring long screw rod (6B); the anchor body of the tensioning end anchor (2B) consists of a sleeve plate III (2B 21), a wedge plate I (2B 31) and a wedge plate II (2B 32) which are respectively a sleeve plate and two wedge plates; a rectangular through seam II (2B 2) is arranged between the sleeve plate III (2B 21) and the wedge-shaped plate I (2B 31), and a wedge-shaped through seam (2B 3) is arranged between the wedge-shaped plate I (2B 31) and the wedge-shaped plate II (2B 32) and is used for inserting the clamping piece (3); the clamping piece (3) is a wedge-shaped block;

one end of the fiber cloth bypasses a sleeve plate III of the anchorage device at the tensioning end and then penetrates out of a rectangular through seam II of the anchorage device at the tensioning end, and then the two ends of the fiber cloth are aligned, and at the moment, the sleeve plate III of the anchorage device at the tensioning end is sleeved with a layer of fiber cloth; the end heads of the fiber cloth with two aligned ends penetrate through the rectangular through seam I of the fixed-end anchorage device and then bypass the sleeve plate I of the fixed-end anchorage device, and at the moment, the sleeve plate I of the fixed-end anchorage device is sleeved with the two layers of fiber cloth; then the fiber cloth with two aligned ends is wound around the sleeve plate III of the anchorage device at the tensioning end and then penetrates out of the rectangular through seam II of the anchorage device at the tensioning end, and at the moment, the three layers of fiber cloth are sleeved on the sleeve plate III of the anchorage device at the tensioning end; continuously pulling the fiber cloth with two aligned ends to the fixed end anchorage, passing through the rectangular through seam I of the fixed end anchorage again and then bypassing the sleeve plate II of the fixed end anchorage, and then sleeving the sleeve plate II of the fixed end anchorage by the two layers of fiber cloth; enabling the fiber cloth with two aligned ends to enter from the narrow side of the wedge-shaped through seam II of the anchorage device at the tensioning end and penetrate out from the wide side; the fiber cloth (8) is clamped between the two clamping pieces (3) and wedged into a wedge-shaped through seam (2B 3) in the anchor (2B) at the tensioning end, so that the fiber cloth (8) is anchored;

the fixed end support (1A), the tensioning end support (1B), the fixed end anchor (2A), the tensioning end anchor (2B) and the clamping piece (3) are made of Q235B grade or above high-quality steel; the anchoring short screw rod (6A) and the anchoring long screw rod (6B) both adopt 12.9-grade high-strength anchor rods, and the shearing stress resistance grade of the anchor rods is 12.9 GPa;

the prestress applying frame (4) is a door-shaped frame and is made of Q235B grade or above high-quality steel; both ends of the door-shaped opening end of the lifting jack are respectively provided with a hexagonal convex body (41) which is used for being clamped into hexagonal holes (2B 11) at both ends of an anchorage device (2B) at a tensioning end, and the tail part of the lifting jack is provided with a baffle plate (42) which is used for abutting against a piston (51) of the lifting jack (5);

the jack (5) is a hydraulic jack, and the front end of the jack is a piston (51).