CN112854800A - Method for improving static load anchoring performance of prestressed carbon plate - Google Patents
Method for improving static load anchoring performance of prestressed carbon plate Download PDFInfo
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- CN112854800A CN112854800A CN202110014328.9A CN202110014328A CN112854800A CN 112854800 A CN112854800 A CN 112854800A CN 202110014328 A CN202110014328 A CN 202110014328A CN 112854800 A CN112854800 A CN 112854800A
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- 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
Abstract
The invention discloses a method for improving static load anchoring performance of a prestressed carbon plate, which comprises the following steps: preparing materials; mounting copper wires; assembling an anchorage device; cleaning and curing the structural adhesive; and (6) pre-tightening treatment. The method can effectively exert the strength of the carbon plate, improve the static load anchoring performance of the prestressed carbon plate, ensure the safety and stability of the reinforced structure and improve the reinforcing performance.
Description
Technical Field
The invention relates to the technical field of building reinforcement, in particular to a method for improving static load anchoring performance of a prestressed carbon plate.
Background
The prestress carbon fiber plate reinforcing technology combines the characteristics of high tensile strength (more than or equal to 2400MPa) and external prestress of the carbon fiber plate, and is a process for reinforcing and reinforcing concrete members in the fields of bridges, highways and civilian use. The prestressing reinforcement technique is to apply a carbon fiber sheet to a certain tensile stress (e.g., 1150MPa) in advance, and then to adhere it to a reinforcing member, and to permanently maintain the prestressing.
Patent CN111735679A discloses a sample preparation method for tensile strength test of carbon fiber plate, which emphasizes that the effect of improving the tensile strength of carbon fiber plate is achieved by controlling the thickness of the support, the thickness of the glue layer, and the length of the anchoring reinforcing sheet. However, the method is only used for testing the strength of the carbon fiber plate in a laboratory environment, in practical engineering application, the application width of the carbon fiber plate is far larger than the width range in the patent, and the improvement of the anchoring static load performance of the carbon fiber plate is limited in the anchoring of the practical prestressed carbon fiber plate by adopting the testing method in the patent.
The actual engineering experience and scientific research show that the anchoring efficiency of the anchorage device is the premise of effectively exerting the high strength of the carbon fiber plate. The carbon fiber plate is a brittle material, and in actual construction, because the size of the carbon fiber plate is large, the anchoring performance of the existing anchorage device is insufficient, stress concentration often occurs, the carbon fiber plate is damaged and peeled off in advance or is pulled out from the anchorage device, and the strength of the carbon fiber plate can be exerted by only 50% -80%. Therefore, in actual construction, the carbon fiber plate is often broken in advance without being stretched to a set stress, so that the safety and the stability are greatly reduced.
Disclosure of Invention
In view of the above-mentioned defects or shortcomings in the prior art, it is desirable to provide a method for improving the static load anchoring performance of a prestressed carbon plate, which can effectively exert the strength of the carbon plate, ensure the safety and stability of the reinforced structure, and improve the reinforcing performance.
The invention provides a method for improving static load anchoring performance of a prestressed carbon plate, which comprises the following steps:
preparing materials, cutting a long-strip-shaped carbon fiber plate, performing sand blasting on the upper surface and the lower surface of an end part anchoring part of the carbon fiber plate, performing sand blasting on an anchoring part of a wedge block made of hard 7075 aluminum alloy, erasing floating ash on the sand blasting parts of the carbon fiber plate and the wedge block, performing rinsing on the sand blasting parts of the carbon fiber plate and the wedge block by using uniformly mixed K-801 two-component structural adhesive, wherein the rinsing is to smear the K-801 two-component structural adhesive to form a uniform thin layer, and then repeatedly scraping until no macroscopic colloid particles exist;
mounting copper wires, namely uniformly coating a layer of K-801 two-component structural adhesive on a sand blasting part of the wedge block, then immediately arranging a plurality of copper wires at equal intervals on the surface of the wedge block coated with the K-801 two-component structural adhesive, wherein the copper wires are not disturbed, the axial direction of each copper wire is perpendicular to the length direction of the carbon fiber plate, the diameter of each copper wire is 0.4-0.5mm, the length of each copper wire is greater than the width of the wedge block, and the interval between every two adjacent copper wires is 20-40 mm;
assembling an anchorage device, wherein the anchorage device is assembled on the carbon fiber plate by adopting the K-801 two-component structural adhesive;
cleaning and curing the structural adhesive, namely cleaning and curing the redundant K-801 two-component structural adhesive between the anchorage device and the carbon fiber plate;
and (4) pre-tightening treatment, namely pre-tightening treatment is carried out on the anchorage device, and the installation is completed.
Preferably, the width of the carbon fiber sheet in the material preparation step is 100mm or 50 mm.
Preferably, the step of assembling the anchorage device specifically includes that two ends of the carbon fiber plate penetrate through two anchor heads in a one-to-one correspondence mode, the anchor heads are respectively close to the middle of the carbon fiber plate, large openings of wedge-shaped hole channels of the anchor heads face outwards, the wedge blocks are attached to anchoring parts of the carbon fiber plate, the wedge blocks on the upper surface and the lower surface of the anchoring parts of the carbon fiber plate are guaranteed to be symmetrical, thin ends of the wedge blocks face the anchor heads, then the end portions of the carbon fiber plate and the wedge blocks are wrapped together through plastic films, and the carbon fiber plate and the wedge blocks are symmetrically distributed and clamped on two sides of the wedge blocks through dovetail clamps.
Preferably, the steps of cleaning and curing the structural adhesive specifically comprise: and after the K-801 two-component structural adhesive is initially dried and becomes plasticine by hand, removing the dovetail clamp, removing the adhesive and the plastic film extruded from the periphery of the wedge block, and standing for no less than 48 hours.
Preferably, the pre-tightening treatment step specifically comprises: and moving the anchor head to sleeve the anchor head on the corresponding wedge block, jacking the wedge block into a wedge-shaped hole in the anchor head by adopting an anchor head mounting tool, pre-tightening the wedge block and the anchor head, and finishing mounting.
Preferably, the distance between adjacent copper wires in the copper wire installation step is 30 mm.
Preferably, the anchoring parts of the carbon fiber plate and the wedge block in the material preparation step are subjected to sand blasting treatment by adopting 60-80-mesh black corundum; the sand blasting pressure of the carbon fiber plate is 0.2-0.3MPa, and the sand blasting pressure of the wedge block is 0.45-0.55MPa
Compared with the prior art, the invention has the beneficial effects that:
the method improves the anchoring of the carbon fiber plate by the technical means of sand blasting the anchoring parts of the carbon fiber plate and the wedge block, rinsing the sand blasting parts, introducing copper wires to control the thickness of the adhesive layer, selecting the hard 7075 aluminum alloy wedge block and the like. In the actual construction of the reinforcing operation, an excellent anchoring effect is formed on the large-size carbon fiber plate, the static load anchoring performance of the prestressed carbon plate is improved, the structural strength of the carbon fiber plate in the reinforcing system can be fully exerted, and the performance of the carbon fiber plate prestressed reinforcing system is further improved.
It should be understood that the statements herein reciting aspects are not intended to limit the critical or essential features of any embodiment of the invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a flow chart of a method for improving the static load anchoring performance of a prestressed carbon plate.
FIG. 2 is a schematic view of the construction of the anchor;
FIG. 3 is a schematic top view of the anchor;
FIG. 4 is a schematic cross-sectional view of the anchor assembly process;
FIG. 5 is a cross-sectional view of the anchor.
Reference numbers in the figures: 11. a carbon fiber sheet; 12. a wedge block; 13. a copper wire; 14. an anchor head; 15. a wedge-shaped channel.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 to 5, an embodiment of the present invention provides a method for improving static load anchorage performance of a prestressed carbon plate, including the following steps:
s11 material preparation, cutting a long carbon fiber plate 11 with the width of 50mm or 100mm, performing sand blasting treatment on the upper surface and the lower surface of an end part anchoring part of the carbon fiber plate 11 by adopting 60-80-mesh black corundum, wherein the sand blasting pressure is 0.2MPa, performing sand blasting treatment on an anchoring part of a wedge block 12 made of hard 7075 aluminum alloy by adopting 60-80-mesh black corundum, the sand blasting pressure is 0.45MPa, wiping floating ash on the sand blasting parts of the carbon fiber plate 11 and the wedge block 12, performing rinsing on the sand blasting parts of the carbon fiber plate 11 and the wedge block 12 by using uniformly mixed K-801 two-component structural adhesive, wherein the rinsing is to form a uniform thin layer by adopting the K-801 two-component structural adhesive, and then repeatedly scraping by adopting a wallpaper knife until no colloid particles visible to naked eyes exist;
s12, mounting copper wires, uniformly coating a layer of K-801 two-component structural adhesive on a sand blasting part of the wedge block 12, then immediately arranging a plurality of copper wires 13 at equal intervals on the surface of the wedge block 12 coated with the K-801 two-component structural adhesive, wherein the surface cannot be disturbed, the axial direction of each copper wire 13 is perpendicular to the length direction of the carbon fiber plate 11, the diameter of each copper wire 13 is 0.45mm, the length of each copper wire 13 is greater than the width of the wedge block 12, and the interval between every two adjacent copper wires 13 is 30 mm;
s13, assembling an anchorage device, enabling two ends of the carbon fiber plate 11 to correspondingly penetrate through two anchor heads 14 one by one, enabling the anchor heads 14 to be close to the middle of the carbon fiber plate 11 respectively, enabling large openings of wedge-shaped hole channels 15 of the anchor heads 14 to face outwards, attaching wedge blocks 12 to anchoring parts of the carbon fiber plate 11, ensuring that wedge blocks 12 on the upper surface and the lower surface of the anchoring parts of the carbon fiber plate 11 are symmetrical, enabling thin ends of the wedge blocks 12 to face the anchor heads 14, wrapping the end parts of the carbon fiber plate 11 and the wedge blocks 12 together through plastic films, and clamping the end parts of the wedge blocks 12 on two sides of the wedge blocks;
s14, cleaning and curing the structural adhesive, removing the dovetail clamp after the K-801 two-component structural adhesive is initially dried and is changed into a plasticine shape by hand touch, removing the adhesive and the plastic film extruded from the periphery of the wedge block 12, and standing for not less than 48 hours;
s15 pre-tightening treatment, moving the anchor head 14 to sleeve the anchor head on the corresponding wedge block 12, pushing the wedge block 12 into the wedge-shaped hole 15 in the anchor head 14 by adopting an anchor head mounting tool, pre-tightening the wedge block 12 and the anchor head 15, and completing the mounting.
The application mainly solves the technical problem of the carbon fiber plate in the actual construction process. The size (usually 50mm or 100mm wide) of the carbon fiber plate in actual construction is much bigger than the size (12.5 mm wide) of the tensile strength detection sample of the carbon fiber plate, the large-size carbon fiber plate has higher anchoring difficulty, and the thickness of the glue layer is more difficult to control.
This application has obtained the prestressing force carbon fiber plate anchoring performance who optimizes more through many-sided technological improvement for the tensile strength of carbon fiber plate has obtained more abundant performance. In order to make the technical effect of each technical point more intuitive, a series of orthogonal experimental comparisons were performed, as shown in tables 1 to 4.
TABLE 1 influence of carbon fiber plate and wedge block sand blasting surface rinsing on anchorage device static load anchoring performance
Wherein each group of data is tested with 5 carbon fiber plates, and the average value of the ultimate tensile stress and the anchor device efficiency coefficient is obtained.
It can be easily found from table 1: the rinsing of the sand blasting parts of the wedge block and the carbon fiber plate has great influence on the static load anchoring performance of the prestressed carbon plate, the width of the rinsed prestressed carbon plate is 50mm, the static load anchoring performance of the prestressed carbon plate with the thickness of 3mm is improved by 23.5 percent compared with that of the prestressed carbon plate without rinsing, the width of the rinsed prestressed carbon plate is 100mm, and the static load anchoring performance of the prestressed carbon plate with the thickness of 2mm is improved by 20.7 percent compared with that of the prestressed carbon plate without rinsing. In addition, the effect of the non-rinse influence of the surface of the carbon fiber plate is obviously higher than that of mechanical blocks. From the destruction form of carbon fiber board, mechanical piece and carbon fiber board do not rinse, all follow the slippage in the mechanical piece before the carbon fiber board reaches the ultimate pulling force, have taken place abnormal damage.
Meanwhile, the carbon plate with small width is more sensitive to the performance of the static load anchorage device, because the smaller the width is, the more uniform the load distribution on the surface of the carbon fiber plate is, the condition of local stress concentration cannot occur, and the larger the ultimate tensile stress is.
The purpose of rinsing is mainly two: firstly, floating ash and floating oil remained on the surfaces of the wedge block and the carbon plate are removed, and the effective bonding area of the structural adhesive, the carbon fiber plate and the anchoring part of the wedge block is prevented from being influenced; secondly, a layer of structural adhesive is coated on the anchoring parts of the carbon fiber plate and the wedge block in advance, and the structural adhesive is infiltrated into the capillary holes of the rough surface in advance, so that the subsequent interface bonding performance is improved. The initial curing time of the structural adhesive is 3-5min, the structural adhesive is difficult to flow after being initially cured, if the structural adhesive is not rinsed in advance, the carbon fiber plate is difficult to be fully infiltrated in a short time after being coated on the surface of the wedge block, and in addition, the active groups on the surface of the carbon fiber plate are few, so that the bonding capacity between the mechanical block and the surface of the carbon fiber plate is greatly reduced if the structural adhesive is not fully infiltrated.
TABLE 2 influence of copper wire placement and orientation on anchorage static load anchorage
Wherein each group of data is tested with 5 carbon fiber plates, and the average value of the ultimate tensile stress and the anchor device efficiency coefficient is obtained.
By comparing the data in table 2, it can be easily found that: the anchoring performance of the bonding surface is greatly influenced after the copper wire is laid on the bonding surface. Compared with the situation that no copper wire is arranged, the static load anchoring performance of the prestressed carbon plate with the width of 50mm and the thickness of 3mm is improved by 9.5% to the maximum extent when the copper wire is arranged along the stress direction and compared with the situation that no copper wire is arranged, the static load anchoring performance of the prestressed carbon plate with the thickness of 3mm is improved by 11% to the maximum extent when the data of 1 and 4 are 100mm in width and the static load anchoring performance of the prestressed carbon plate with the thickness of 2mm is; compared with the copper wire which is not arranged, the static load anchoring performance of the prestressed carbon plate is improved by 25% and 22% respectively when the copper wire is arranged in the direction perpendicular to the stress direction; compared with the copper wire arranged along the stress direction, the static load anchoring performance of the prestressed carbon plate is improved by 19.3% and 15.1% to the maximum extent. In addition, the spacing of the copper wires has some influence on the static load anchorage performance seen in the stress direction, wherein the spacing is 50mm wide by 20mm, the 3mm thick carbon plate is best in performance, the spacing is 100mm wide by 30mm, and the 2mm thick carbon plate is best in performance.
The damage mode shows that the carbon fiber plate without the copper wire on the bonding surface is pulled out of the wedge block to slip, and the carbon fiber plate with the copper wire is damaged from the integral loose wire section at the middle or edge part. The reason for this analysis is: compare in not putting the copper wire, place the copper wire after, through the extrusion of forked tail clamp, the colloid thixotropy is better, and the thickness control of glue film is more even, and distribution at atress in-process stress is more even.
And a copper wire is also placed, and the width of the anchoring part of the carbon fiber plate is 50mm, and the length of the anchoring part of the carbon fiber plate is 150 mm. According to the damage form of the carbon fiber plates, the copper wires are laid along the stress direction, and the carbon fiber plates with the distance of 10mm are finally damaged to show that the carbon plates on the part in the width direction are slipped and slightly split, so that the effective bonding area is reduced due to the fact that the copper wires are laid in too many numbers. The spacing is 20mm wide and is 100mm wide, the copper wire part clamped in the middle of the 2mm thick carbon plate has slight splitting phenomenon, the carbon plate is 50mm wide and 3mm thick, the edge part of the carbon plate is split, and the carbon plate has slight slipping phenomenon. The spacing is 30 mm's 100mm wide, and the whole burst of splitting takes place to split back in the 2mm thick carbon plate edge position, and 50mm are wide, and 3mm thick carbon plate edge position splits and the carbon plate has slight slippage phenomenon. And the copper wire is laid in the direction perpendicular to the stress direction, the carbon fiber plate is not damaged in advance at the front edge part of the damage, and the whole middle section is damaged.
The analysis reason is that the carbon fiber plates with the copper wires laid along the stress direction are small in distance, the number of the laid copper wires is large, and the effective bonding area is slightly reduced. After the interval increases, the splitting all takes place for carbon plate edge part position, and its edge part is difficult to effectively guarantee to bond and glue film thickness, and when external load was enough big, take place stress concentration, the stress concentration appears in the destruction in advance. And the copper wire is laid to the perpendicular to atress direction, and its glue film thickness compares in laying more evenly of copper wire along the atress direction, and during the carbon fiber board atress, stress distribution is more even.
TABLE 3 influence of the arrangement distance of adjacent copper wires on the static load anchoring performance of the anchorage
Wherein each group of data is tested with 5 carbon fiber plates, and the average value of the ultimate tensile stress and the anchor device efficiency coefficient is obtained.
By comparison in table 3, the failure modes of the carbon fiber sheet are all the breaking of the loose filaments at the middle part or the edge part. When the arrangement distance of the copper wires is between 20 and 40mm, the static load performance of the anchorage device of the prestressed carbon plate is changed slightly, and after the distance is larger than 40mm, only 1 to 3 copper wires can be stored at the sand blasting part (with the length of 150mm) of the wedge block, so that the uniformity of the thickness of the glue layer is difficult to effectively ensure.
TABLE 4 influence of wedges of different materials on the static load anchorage performance of anchorage device
Wherein each group of data is tested with 5 carbon fiber plates, and the average value of the ultimate tensile stress and the anchor device efficiency coefficient is obtained.
From table 4, it is found that the wedge material has a large influence on the anchoring performance, and the wedge anchoring performance of the hard 7075 aluminum alloy material is better than that of 40Cr and 2011 aluminum alloys. The data show that for the hard 7075 aluminum alloy and the 2011 aluminum alloy, the static load anchoring performance of the prestressed carbon plate with the width of 50mm and the thickness of 3mm is improved by 45.8 percent, and the static load anchoring performance of the prestressed carbon plate with the width of 100mm and the thickness of 2mm is improved by 50 percent. For hard 7075 aluminum alloy and 40Cr materials, the static load anchoring performance of the prestressed carbon plate is respectively improved by 31% and 32%.
From the damage form, we find that the 2011 aluminum alloy is soft, and after the aluminum alloy is subjected to large stress, the wedge block at the front end is extruded and deformed and then props against the tensioning baffle plate, so that the aluminum alloy is deformed and then is pulled out from the anchorage device, and abnormal damage is caused. And the 40Cr wedge block causes the carbon fiber plate at the front end of the anchorage device to be split due to the notch effect at the front end of the wedge block, so that loose wires are formed and abnormal damage is caused.
The static load anchoring performance eta a of the prestressed carbon fiber plate is calculated according to the following formula:
ηa＝FTu/Fptk；
Fptk＝Apk×fptk；
wherein: apk is the sectional area (mm) of the prestressed carbon fiber plate2) For example: a carbon fiber plate with a width of 100mm and a thickness of 2mm and a sectional area of 200mm2；
fptk is the ultimate tensile strength of the prestressed carbon fiber plate is 2400 MPa;
fptk is the nominal ultimate tensile stress (kN) of the prestressed carbon fiber plate;
FTu is the measured ultimate tensile stress (kN) of the prestressed carbon fiber plate.
In conclusion, through comparison and verification of a plurality of tests, the method provided by the application has the advantage that the reinforcing performance of the large-size carbon fiber plate is greatly improved. The method has the advantages that the method is applied to actual construction, a good effect is achieved, and the performance of a prestressed carbon plate reinforcing system is greatly improved.
In the description of the present specification, the terms "connect", "mount", "fix", and the like are to be understood in a broad sense, for example, "connect" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description of the present application, the description of the terms "one embodiment," "some embodiments," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. A method for improving the static load anchoring performance of a prestressed carbon plate is characterized by comprising the following steps:
preparing materials, cutting a long-strip-shaped carbon fiber plate, performing sand blasting on the upper surface and the lower surface of an end part anchoring part of the carbon fiber plate, performing sand blasting on an anchoring part of a wedge block made of hard 7075 aluminum alloy, erasing floating ash on the sand blasting parts of the carbon fiber plate and the wedge block, performing rinsing on the sand blasting parts of the carbon fiber plate and the wedge block by using uniformly mixed K-801 two-component structural adhesive, wherein the rinsing is to smear the K-801 two-component structural adhesive to form a uniform thin layer, and then repeatedly scraping until no macroscopic colloid particles exist;
mounting copper wires, namely uniformly coating a layer of K-801 two-component structural adhesive on a sand blasting part of the wedge block, then immediately arranging a plurality of copper wires at equal intervals on the surface of the wedge block coated with the K-801 two-component structural adhesive, wherein the copper wires are not disturbed, the axial direction of each copper wire is perpendicular to the length direction of the carbon fiber plate, the diameter of each copper wire is 0.4-0.5mm, the length of each copper wire is greater than the width of the wedge block, and the interval between every two adjacent copper wires is 20-40 mm;
assembling an anchorage device, wherein the anchorage device is assembled on the carbon fiber plate by adopting the K-801 two-component structural adhesive;
cleaning and curing the structural adhesive, namely cleaning and curing the redundant K-801 two-component structural adhesive between the anchorage device and the carbon fiber plate;
and (4) pre-tightening treatment, namely pre-tightening treatment is carried out on the anchorage device, and the installation is completed.
2. The method for improving the static load anchorage performance of the prestressed carbon plate as claimed in claim 1, wherein the width of the carbon fiber plate in the material preparation step is 100mm or 50 mm.
3. The method for improving the static load anchoring performance of the prestressed carbon plate as recited in claim 2, wherein the step of assembling the anchorage device specifically includes passing two ends of the carbon fiber plate through two anchor heads in a one-to-one correspondence manner, so that the anchor heads are respectively close to the middle portions of the carbon fiber plate, large openings of wedge-shaped hole channels of the anchor heads are outward, attaching the wedge blocks to anchoring portions of the carbon fiber plate, ensuring that the wedge blocks on the upper and lower sides of the anchoring portions of the carbon fiber plate are symmetrical, thin ends of the wedge blocks face the anchor heads, wrapping the end portions of the carbon fiber plate and the wedge blocks together with plastic films, and clamping the end portions of the wedge blocks on two sides of the wedge blocks in a symmetrical distribution manner by using dovetail clamps.
4. The method for improving the static load anchoring performance of the prestressed carbon plate as recited in claim 3, wherein the steps of cleaning and curing the structural adhesive are specifically as follows: and after the K-801 two-component structural adhesive is initially dried and becomes plasticine by hand, removing the dovetail clamp, removing the adhesive and the plastic film extruded from the periphery of the wedge block, and standing for no less than 48 hours.
5. The method for improving the static load anchoring performance of the prestressed carbon plate as claimed in claim 4, wherein the pre-tightening treatment step is specifically as follows: and moving the anchor head to sleeve the anchor head on the corresponding wedge block, jacking the wedge block into a wedge-shaped hole in the anchor head by adopting an anchor head mounting tool, pre-tightening the wedge block and the anchor head, and finishing mounting.
6. The method for improving the static load anchoring performance of the prestressed carbon plate as recited in claim 5, wherein the pitch of the adjacent copper wires in said copper wire installation step is 30 mm.
7. The method for improving the static load anchoring performance of the prestressed carbon plate as recited in claim 6, wherein the carbon fiber plate and the wedge block in the material preparation step are both subjected to sand blasting treatment by using 60-80 mesh black corundum; the sand blasting pressure of the carbon fiber plate is 0.2-0.3MPa, and the sand blasting pressure of the wedge block is 0.45-0.55 MPa.
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Application publication date: 20210528 |