CN110029594B - Construction method for reinforcing concrete beam by using multiple layers of prestressed fiber cloth - Google Patents

Construction method for reinforcing concrete beam by using multiple layers of prestressed fiber cloth Download PDF

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CN110029594B
CN110029594B CN201910296160.8A CN201910296160A CN110029594B CN 110029594 B CN110029594 B CN 110029594B CN 201910296160 A CN201910296160 A CN 201910296160A CN 110029594 B CN110029594 B CN 110029594B
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fiber cloth
anchor
tensioning
fixed
end support
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CN110029594A (en
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王强
李柏林
卢春玲
朱万旭
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Guilin University of Technology
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Guilin University of Technology
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements

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  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
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  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)

Abstract

The invention discloses a construction method for reinforcing a concrete beam by using multiple layers of prestressed fiber cloth. The tensioning and anchoring device for the multi-layer prestressed fiber cloth reinforced beam comprises a fixed end support, a tensioning end support, a fixed end anchor, a tensioning end anchor, a clamping piece, an anchoring short screw, an anchoring long screw, a chemical bolt, fiber cloth, a prestress applying frame and a jack. The stretching and anchoring of the fiber cloth are realized through the stretching device and the anchoring device of the multi-layer prestressed fiber cloth reinforced beam. The construction method is convenient to operate, large prestress can be applied, the stress of the multi-layer fiber cloth is uniform and equal in length, and meanwhile, the prestress applying frame can be repeatedly used.

Description

Construction method for reinforcing concrete beam by using multiple layers of prestressed fiber cloth
Technical Field
The invention relates to a construction method for reinforcing a concrete beam by using multiple layers of prestressed fiber cloth, which realizes the reinforcing construction of the concrete beam by using a tensioning and anchoring device of the multiple layers of prestressed fiber cloth and belongs to the field of reinforcing of building bridge engineering.
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 only a single-layer or double-layer prestressed fiber cloth is adopted to reinforce a concrete structure, and the construction method for reinforcing the concrete beam by using the multiple layers of prestressed fiber cloth is less 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 construction method is complicated, the screw rod at the tensioning end is long, the fiber cloth slides greatly after prestress is applied, and the anchoring property is poor.
Disclosure of Invention
The invention provides a construction method for reinforcing a concrete beam by using multiple layers of prestressed fiber cloth, which aims to solve the problems that the multiple layers of prestressed fiber cloth are unequal in length, uneven in stress, complicated in construction method and low in anchoring efficiency in a concrete structure reinforced by the multiple layers of prestressed fiber cloth. The fiber cloth anchoring device in the construction method adopts the clamping piece and the winding type anchorage, has more reasonable structural stress, can bear larger prestress, can ensure that each layer of fiber cloth has equal length and good anchoring effect, and can fully utilize the performance of the fiber cloth.
The method comprises the following specific steps:
(1) the tensioning and anchoring device for the multilayer 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 prestress 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 anchor at the tensioning end is in a rectangular shape, each anchor end is provided with a circular anchor hole IV used for being connected with the fixed end support, each circular anchor hole IV of the anchor at the tensioning end comprises a hexagonal hole and a circular hole, the depth of the hexagonal hole is equal to the sum of the thickness of a hexagonal bulge of the prestress applying frame and the thickness of an anchor head of the anchoring long screw rod, an anchor body of the anchor at the tensioning end comprises a sleeve plate and two wedge-shaped plates which are respectively a sleeve plate III, the wedge-shaped plates I and II are provided with a rectangular through seam II between the sleeve plate III and the wedge-shaped plate I, and a wedge-shaped through seam is arranged between the wedge-shaped plates I and 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 made of 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.
(2) Determining a reinforcing position and processing the concrete surface, wherein the method comprises the following steps:
Figure DEST_PATH_IMAGE002
determining a reinforcement position on the reinforced concrete beam; 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.
Figure DEST_PATH_IMAGE004
And (3) polishing, hole filling and other treatment are carried out on the concrete surface within the reinforcing range of the reinforced concrete beam, and then a layer of epoxy glue layer is uniformly coated on the surface of the concrete surface.
(3) The length of the required fiber cloth is determined according to the length of the reinforcing member and the number of layers of the required fiber cloth, and then cutting is performed.
(4) Connecting the fiber cloth cut in the step (3) with a tensioning end anchorage device and a fixed end anchorage device, and comprises the following steps:
Figure 800742DEST_PATH_IMAGE002
and (3) passing one end of the fiber cloth through a rectangular through seam II of the tensioning end anchorage device after bypassing the sleeve plate III of the tensioning end anchorage device, aligning the two ends of the fiber cloth, and sleeving the sleeve plate III of the tensioning end anchorage device by one layer of the fiber cloth.
Figure 794106DEST_PATH_IMAGE004
And 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 by the two layers of fiber cloth.
Figure DEST_PATH_IMAGE006
And then the fiber cloth with two aligned ends bypasses 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.
Figure DEST_PATH_IMAGE008
And continuously pulling the fiber cloth with the 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 at the moment, sleeving the sleeve plate II of the fixed-end anchorage by the two layers of fiber cloth.
Figure DEST_PATH_IMAGE010
And (3) 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.
Figure DEST_PATH_IMAGE012
And uniformly smearing fiber cloth bonding glue on the fiber cloth end head which penetrates out of the wide side of the wedge-shaped through seam II and is aligned with the two ends of the wedge-shaped through seam II. Meanwhile, fiber cloth bonding glue is uniformly coated on the contact surfaces of the two clamping pieces and the ends of the fiber cloth.
Figure DEST_PATH_IMAGE014
And clamping the fiber cloth ends with two aligned ends by using two clamping pieces, wedging the clamping pieces into a wedge-shaped through seam II of the tensioning end anchorage device, and finishing the connection of the fiber cloth with the tensioning end anchorage device and the fixed end anchorage device after the bonding glue of the fiber cloth is cured.
(5) The fixed end support and the tensioning end support are assembled on the reinforcing beam, and the method comprises the following steps:
Figure 204227DEST_PATH_IMAGE002
eight chemical bolt holes for installing the fixed end support and the tensioning end support are drilled in the reinforcing position of the beam to be reinforced, the chemical pipe is arranged after the holes are cleaned, the chemical bolt is screwed in by an electric drill until the chemical flows out, and the chemical bolt is implanted after the gel is hardened.
Figure 941239DEST_PATH_IMAGE004
And respectively penetrating the elliptical through hole I of the fixed end support and the elliptical through hole II of the tensioning end support through chemical bolts, and then screwing nuts on the chemical bolts to fix the fixed end support and the tensioning end support to the surface of the reinforcing beam.
(6) And the fixed end anchorage is connected with the fixed end support.
The circular anchor hole III of the fixed-end anchor is aligned with the circular anchor hole I of the fixed-end support, the two anchoring short screw rods are respectively penetrated into the circular anchor hole I of the fixed-end support and the circular anchor hole III of the fixed-end anchor, and nuts on the two anchoring short screw rods are simultaneously screwed down to complete connection of the fixed-end anchor and the fixed-end support.
(7) The tension end anchorage device is connected with the tension end support.
And aligning the circular anchor holes IV at the two ends of the anchorage device at the tensioning end with the circular anchor holes II at the two sides of the support at the tensioning end. And respectively penetrating the two anchoring long screws through the anchor holes of the anchorage devices at the tensioning ends, and embedding the anchor heads of the anchoring long screws into the hexagonal holes. And then the two anchoring long screws respectively penetrate into the circular anchor holes II on the two sides of the tensioning end support, and the nuts are screwed into the anchoring long screws without being screwed down, so that the connection between the tensioning end anchorage device and the tensioning end support is completed.
(8) Installing a prestress applying frame and a jack, and tensioning and anchoring the fiber cloth, wherein the method comprises the following steps:
Figure 464624DEST_PATH_IMAGE002
the bottom of the jack is tightly attached to the trapezoidal baffle of the support at the tensioning end, and the jack is tightly attached to the bottom surface of the beam.
Figure 363310DEST_PATH_IMAGE004
And (3) clamping the hexagonal convex body on the door-shaped opening end of the prestress applying frame into the hexagonal hole of the tensioning end anchorage device, and enabling the jack piston to extend out to be propped against the tail baffle plate of the prestress applying frame.
Figure 604936DEST_PATH_IMAGE006
And pushing the prestress applying frame by using a jack to enable the tensioning end anchorage device to move towards the tensioning end support connected with the tensioning end anchorage device so as to apply prestress to the fiber cloth. After the prestress is applied to a specified value, nuts on the two anchoring long screws are respectively screwed down. And (5) returning oil to the jack, and removing the prestress applying frame and the jack.
Figure 470605DEST_PATH_IMAGE008
And (3) uniformly coating a layer of resin impregnating adhesive on the surface of the fiber cloth to finish the reinforcement of the reinforced concrete beam.
Compared with the prior art, the application can obtain the following technical effects:
1. the reinforcing device in the construction method adopts a reinforcing method combining winding and clip anchoring, so that the problem that the fiber cloth of each layer is not equal in length in the reinforcing process of the multi-layer prestressed fiber cloth can be effectively solved; 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. The construction of the even number layers of the prestressed fiber cloth reinforced beam with more than 4 layers can be conveniently realized by adopting the combination of the tension end anchorage and the fixed end anchorage in the construction method.
3. After the prestressed fiber cloth reinforcing device in the construction method is utilized to stretch and anchor 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 construction method is convenient to stretch the multi-layer prestressed fiber cloth. 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
Figure 114076DEST_PATH_IMAGE002
Schematic representation.
FIG. 19 connecting step of fiber cloth with tension end anchorage and fixed end anchorage
Figure 449242DEST_PATH_IMAGE004
Schematic representation.
FIG. 20 connecting step of fiber cloth with tension end anchorage and fixed end anchorage
Figure 647005DEST_PATH_IMAGE006
Schematic representation.
FIG. 21 connecting step of fiber cloth with tension end anchorage and fixed end anchorage
Figure 725820DEST_PATH_IMAGE008
Schematic representation.
FIG. 22 connecting step of fiber cloth with tension end anchorage and fixed end anchorage
Figure 223797DEST_PATH_IMAGE010
Schematic representation.
FIG. 23 connecting step of fiber cloth with tension end anchorage and fixed end anchorage
Figure 588920DEST_PATH_IMAGE012
-
Figure 539558DEST_PATH_IMAGE014
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. 1-28, this embodiment utilizes a stretch-draw and anchor device of multilayer prestressing force fibre cloth reinforcing beam to the reinforced concrete roof beam is the reinforcement object, adopts eight layers of prestressing force carbon fibre cloth to consolidate it, and the carbon fibre cloth is wide 150mm, and concrete construction steps are as follows:
(1) the tensioning and anchoring device for the multilayer prestressed fiber cloth reinforced beam 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 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.
The fixed end support 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.
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.
The fixed end anchorage device 2A is in a cuboid 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.
The anchorage device 2B at the tensioning end is in a cuboid 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.
The prestress applying frame 4 is a door-shaped frame and is made of Q235B grade or above high-quality steel. 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.
(2) Determining a reinforcing position and processing the concrete surface, wherein the method comprises the following steps:
Figure 890905DEST_PATH_IMAGE002
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.
Figure 243389DEST_PATH_IMAGE004
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.
(3) 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.
(4) Connecting the fiber cloth cut in the step (3) with a tensioning end anchorage device and a fixed end anchorage device, and comprises the following steps:
Figure 185937DEST_PATH_IMAGE002
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).
Figure 217347DEST_PATH_IMAGE004
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).
Figure 637964DEST_PATH_IMAGE006
Then the fiber cloth 8 with two aligned ends is wound around the sleeve plate of the anchor 2B at the tensioning endIII 2B21, and then penetrates out of the rectangular through seam II 2B2 of the tensioning end anchorage device 2B, and at the moment, the three layers of fiber cloth 8 are sleeved on a sleeve plate III 2B21 of the tensioning end anchorage device 2B (see fig. 20).
Figure 579375DEST_PATH_IMAGE008
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)
Figure 692825DEST_PATH_IMAGE010
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).
Figure 211531DEST_PATH_IMAGE012
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).
Figure 435839DEST_PATH_IMAGE014
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).
(5) The fixed end support and the tensioning end support are assembled on the reinforcing beam, and the method comprises the following steps:
Figure 497336DEST_PATH_IMAGE002
eight holes for installing the fixed end support 1A and the tension end support 1B are drilled at the reinforcing position of the beam to be reinforcedAnd (3) cleaning the chemical bolt holes, then placing a chemical tube, screwing the chemical bolt 7 into the chemical bolt by using an electric drill until the chemical flows out, and completing the implantation of the chemical bolt after the gel is hardened.
Figure 250528DEST_PATH_IMAGE004
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).
(6) 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).
(7) The tension end anchorage device is connected with the tension end support. And aligning circular anchor holes IV (2B 1) at two ends of the tensioning end anchorage device 2B with circular anchor holes II 1B2 at two sides of the tensioning end support 1B. 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).
(8) Installing a prestress applying frame and a jack, and tensioning and anchoring the fiber cloth, wherein the method comprises the following steps:
Figure 663055DEST_PATH_IMAGE002
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 (see figure 27).
Figure 691054DEST_PATH_IMAGE004
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.
Figure 466112DEST_PATH_IMAGE006
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.
Figure 655784DEST_PATH_IMAGE008
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)

1. A construction method for reinforcing a concrete beam by using multiple layers of prestressed fiber cloth is characterized by comprising the following specific steps:
(1) the tensioning and anchoring device for the multilayer prestressed fiber cloth reinforced beam is arranged and 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 prestress 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 a circular anchor hole I for connecting a fixed end anchor is formed in each of two sides of the fixed end support; 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 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; 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 at the fixed end is in a cuboid shape, the anchor end is respectively provided with a round anchor hole III which is used for being connected with the fixed end support, the anchor body consists of two sleeve plates which are respectively 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 anchor at the tensioning end is in a cuboid shape, each anchor end is provided with a circular anchor hole IV used for being connected with the fixed end support, each circular anchor hole IV of the anchor at the tensioning end consists of a hexagonal hole and a circular hole, the depth of the hexagonal hole is equal to the sum of the thickness of a hexagonal bulge of the prestress applying frame and the thickness of an anchor head for anchoring the long screw rod, an anchor body of the anchor at the tensioning end consists of a sleeve plate and two wedge-shaped plates which are respectively 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 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 heads of the fiber cloth are 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 made of 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, Q235B grade and above high-quality steel is adopted, two hexagonal bulges are respectively arranged at two ends of the door-shaped opening end of the prestress applying frame and used for being clamped into the hexagonal holes at two ends of the tensioning end anchorage device, and a baffle plate is arranged at the tail part of the prestress applying frame and used for abutting against a piston of the jack;
the jack is a hydraulic jack, and the front end of the jack is a piston;
(2) determining a reinforcing position and processing the concrete surface, wherein the method comprises the following steps:
determining a reinforcement position on the reinforced concrete beam; popping up a position range needing to be reinforced by prestressed fiber cloth on the surface of the ink line;
polishing, hole filling and other treatment are carried out on the concrete surface within the reinforcing range of the reinforced concrete beam, and then a layer of epoxy glue layer is uniformly coated on the surface of the concrete surface;
(3) determining the length of the required fiber cloth according to the length of the reinforcing member and the number of layers of the required fiber cloth, and then cutting;
(4) connecting the fiber cloth cut in the step (3) with a tensioning end anchorage device and a fixed end anchorage device, and comprises the following steps:
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;
uniformly coating fiber cloth bonding glue on fiber cloth end heads which penetrate out of the wide side of the wedge-shaped through seam II and are aligned at two ends; meanwhile, fiber cloth bonding glue is uniformly coated on the contact surfaces of the two clamping pieces and the ends of the fiber cloth;
clamping the fiber cloth end with two aligned ends by using two clamping pieces, wedging the clamping pieces into a wedge-shaped through seam II of the tensioning end anchorage device, and completing the connection of the fiber cloth with the tensioning end anchorage device and the fixed end anchorage device after the fiber cloth bonding glue is cured;
(5) the fixed end support and the tensioning end support are assembled on the reinforcing beam, and the method comprises the following steps:
drilling eight chemical bolt holes for installing a fixed end support and a stretching end support at the reinforcing position of the beam to be reinforced, placing a medicament pipe after cleaning the holes, screwing the chemical bolts into the chemical bolts by using an electric drill until the medicament flows out, and completing the implantation of the chemical bolts after the gel is hardened;
respectively penetrating the oval through hole I of the fixed end support and the oval through hole II of the tensioning end support through chemical bolts, and then screwing nuts on the chemical bolts to fix the fixed end support and the tensioning end support to the surface of the reinforcing beam;
(6) the fixed end anchorage is connected with the fixed end support;
aligning a circular anchor hole III of the fixed-end anchor with a circular anchor hole I of the fixed-end support, respectively penetrating two anchoring short screw rods into the circular anchor hole I of the fixed-end support and the circular anchor hole III of the fixed-end anchor, and simultaneously screwing nuts on the two anchoring short screw rods to complete the connection of the fixed-end anchor and the fixed-end support;
(7) the tensioning end anchorage device is connected with the tensioning end support;
aligning circular anchor holes IV at two ends of an anchorage device at a tensioning end with circular anchor holes II at two sides of a support at the tensioning end; respectively penetrating the two anchoring long screws through anchor holes of an anchorage device at the tensioning end, and embedding anchor heads of the anchoring long screws into hexagonal holes; then the two anchoring long screw rods are respectively penetrated into the circular anchor holes II on the two sides of the tensioning end support, and the nuts are screwed into the anchoring long screw rods without being screwed down, so that the connection between the tensioning end anchorage device and the tensioning end support is completed;
(8) installing a prestress applying frame and a jack, and tensioning and anchoring the fiber cloth, wherein the method comprises the following steps:
the bottom of a jack is tightly attached to the trapezoidal baffle of the tensioning end support, and the jack is tightly attached to the bottom surface of the beam;
the hexagonal bulge on the door-shaped opening end of the prestress applying frame is clamped into a hexagonal hole of an anchorage device at a tensioning end, and a jack piston extends out to be propped against a tail baffle of the prestress applying frame;
pushing the prestress applying frame by using a jack to enable the tensioning end anchorage device to move towards a tensioning end support connected with the tensioning end anchorage device so as to apply prestress to the fiber cloth; after the prestress is applied to a specified value, nuts on the two anchoring long screws are respectively screwed down; returning oil to the jack, and removing the prestress applying frame and the jack;
and (3) uniformly coating a layer of resin impregnating adhesive on the surface of the fiber cloth to finish the reinforcement of the reinforced concrete beam.
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