TWI596264B - Reinforcement jacket and concrete columns of the reinforcement method - Google Patents

Description

Reinforcement jacket and concrete column reinforcement method

The disclosure relates to a method for reinforcing a reinforcing jacket and a concrete column.

Taiwan has an island-type climate, with a hot summer climate, strong winter winds, large temperature difference between day and night, high humidity, and even salt in the air in coastal areas, which can cause serious chloride and corrosion and other symptoms of sea sand houses, resulting in structures. Defects such as cracks and flaking, which may cause dumping or collapse and endanger public safety. In addition, Taiwan is located in the Pacific Rim seismic zone between the Eurasian plate and the Philippine plate. It is a region with frequent global earthquakes, structural reinforcement for bridges and existing buildings, and improved seismicity of public buildings in new cases. It is a matter of urgency.

According to an assessment report by the Federal Highway Administration (FHWA), there are more than 240,000 bridges with serious loss of function in the United States, accounting for 42% of the bridges in the United States. It is estimated that 500 bridges must be repaired. More than 100 million US dollars, so the repair of bridges has become an important issue for developed countries. Taiwan faces the same problem. Take the bridge structure as an example. At present, there are about 18,000 existing bridges in Taiwan, and the number is increasing. The average bridge age is more than 20 years. These bridges are aging, cracked, damaged, aged and repaired. In the case of overloaded vehicles and environmental corrosion, the function of the bridge has become increasingly serious, and the function of the bridge has been reduced. The service life has been greatly shortened. In 2008, due to the typhoon, the Houfeng Bridge was accidentally broken. In addition to the casualties, the company was faced with traffic disruption and diversion. It costs a lot of social costs.

FIG. 1 illustrates a conventional manual process for reinforcing and reinforcing a fiber composite material. For bridges with insufficient earthquake resistance, reinforcement repair is more economical than demolition and reconstruction. Although there are quite a lot of reinforcement methods used in bridge columns, the new trend of reinforcement technology is to apply fiber-reinforced polymer composite (FRP) to civil engineering. The base structure is reinforced. After the Great Hanshin Earthquake in 1955, Japan’s post-disaster repair and anti-seismic measures to improve the seismic resistance of old buildings prompted the use of carbon fiber in the reinforcement of civil construction materials. According to statistics, in 2008, Japan’s carbon fiber reinforcement fabrics were about 1.2 million square meters. The amount of Kevlar or Twaron reinforced fabric is about 300,000 square meters.

Figure 2 illustrates a conventional reinforcement procedure using a fiber composite jacket. Conventional fiber composite jackets are manufactured by using various fiber composite molding methods, such as Sheet Molding Coumpont, pultrusion, and winding, which are usually provided for the lap joint of the jacket. There are certain ways.

3 and 4 illustrate a conventional one-piece jacket 10 by a conventional winding method. The conventional winding method is to continuously wind the fiber 13 on a mold 11 to form a jacket 10 having an inner diameter larger than the outer diameter of the reinforcement, which uses an extra circumference as a lap. One-piece jacket is prepared by the winding method. If it is cut into two pieces, the curvature of the jacket is larger than the curvature of the reinforcement, so there is a loose or inconsistency, which affects the reinforcing effect.

Figures 5 and 6 illustrate a conventional two-piece jacket 20. The mat mold forming method and the pultrusion forming method are designed by the mold, and the two parts are generally combined, and the degree of the joint portion 21 is relatively good. However, the jacket lap joint method prepared by these methods has a common characteristic that the lap portion 21 and the jacket body 23 are both composite structures in which the fiber composite material has been hardened and reacted. When the jacket 20 is to be combined and pressed, it is necessary to The adhesion of the lap portion 21 using an adhesive, and the adhesion of both sides of the polymer composite structure depends mainly on the strength of the adhesive itself and the adhesion to the adhesion surface. The strength of the adhesive comes from the tensile strength of itself and the strength of the shear force. This strength is usually only 1% to 10% compared with the strength of the composite. If the thickness of the adhesive exceeds a certain thickness, the adhesive will appear. The failure mode belongs to the tensile and shear failure of the adhesive itself.

The degree of surface wetting of the adhesive and whether the adhesive reacts with the bonding surface to affect the strength of the bonding strength. In short, the better the wetting effect of the adhesive on the adhesive surface, the better the bonding strength. The more the chemical reaction between the adhesive and the bonding surface, the better the bonding strength. Therefore, the polymer resin of the fiber composite material has been Close to 100% of the reaction procedure, the surface and the adhesive are difficult and rarely produce a bridge chemical reaction, then the force is mainly physical adhesion, chemical adhesion is very small, the conventional two-piece jacket fiber The composite material has nearly 100% reaction procedure, which is the type, and its strength is weaker.

The present disclosure provides a reinforcing jacket comprising a body comprising a fiber composite material impregnated with resin; and a lap portion disposed on a side of the body, the lap portion comprising a fiber composite material not impregnated with resin and the fiber composite The material is in the shape of a sap.

The present disclosure provides a method for reinforcing a concrete column, which comprises covering the concrete column with at least one reinforcing jacket, wherein the reinforcing jacket comprises a body comprising a fiber composite material impregnated with resin; and a lap portion disposed on the body On the side, the lap includes a fiber composite material that is not impregnated with resin and the fiber composite material has a succulent shape. Thereafter, the resin is applied to the lap portion such that the fiber composite material of the lap portion cross-links with the resin.

The technical features and advantages of the present disclosure have been broadly described above, and the detailed description of the present disclosure will be better understood. Other technical features and advantages of the subject matter of the claims of the present disclosure will be described below. It is to be understood by those of ordinary skill in the art that the present invention may be <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; It is to be understood by those of ordinary skill in the art that this invention is not limited to the scope of the present disclosure as defined by the appended claims.

7 is a flow chart showing the preparation of the reinforcing jacket 40 according to an embodiment of the present invention, and FIGS. 8 to 12 illustrate a method of preparing the reinforcing jacket 40 according to an embodiment of the present invention. In one embodiment of the invention, a fiber composite (e.g., carbon fiber unidirectional pre-knit) 31 is first cut according to the desired size and number of layers of the laminate, and the two sheets are cut to be slightly larger than the carbon fiber unidirectional pre-knit 31. PET film (not shown) wherein the fiber composite comprises carbon fiber, fiberglass, Kevlar or Twaron. After that, the epoxy resin was blended, and the A and B agents were mixed in proportion and thoroughly stirred and defoamed under vacuum. In one embodiment of the present invention, the fiber unidirectional pre-knit 31 can be roughly divided into a body 33 and a peripheral portion 35.

Referring to FIG. 9, the epoxy resin 37 is poured onto the first PET film, and the epoxy resin is evenly coated on the PET film with a doctor blade, and then a piece of fiber unidirectional pre-knit 31 is placed, wherein the body 33 and the PET are The film is overlapped; after that, the epoxy resin 37 is poured onto the body 33 of the fiber unidirectional pre-knit 31 and the epoxy resin is uniformly coated with a doctor blade, and then the second PET film is coated on the body 33, and the blade is used in the PET. The epoxy resin 37 is evenly distributed on the film to complete a reinforcing material 30, and the two PET films are applied to the lower surface of the carbon fiber unidirectional pre-knit 31 to flatten the carbon fiber unidirectional pre-knit 31.

Referring to Figures 10 and 11, the reinforcing material 30 is applied to a mold 39 and wound with a tension of 3 to 6 kgf in a forward polypropylene (OPP) tape (width of 2 to 10 cm, thickness 0.2 to 0.4 mm). The forward polypropylene coats the surface of the reinforcing material 30 as much as possible. Thereafter, depending on the reaction conditions of the epoxy resin, the epoxy resin is allowed to stand for about 12 to 24 hours to complete the bridging crosslinking reaction and hardening (or baking in an oven at 130 ° C for about 90 minutes, and the epoxy resin hardening reaction is completed). The reinforcing jacket 40 is completed by removing the forward polypropylene tape, demolding, and trimming the burrs, as shown in FIG.

The reinforcing jacket 40 is a cylindrical one-piece jacket, and includes a body 41 and a lap 43. The body 41 includes a fiber composite material 31 impregnated with an epoxy resin 37. The lap portion 43 is disposed on a side of the body 41, and includes a fiber composite material 31 not impregnated with an epoxy resin and the fiber composite material 31 has a stalk shape. The width of the lap portion 43 is between 10 and 30% of the circumference of the body 41.

13 to 15 illustrate a method of preparing a reinforcing jacket 50 according to another embodiment of the present invention. If the reinforcing cylinder is a circular cylinder, a reinforcing jacket 50 (shown in FIG. 13) may be formed by two semi-cylindrical jackets 50A and 50B, wherein the sub-jackets 50A and 50B each include a The laps 53 are disposed on the side of the body 41. The sub-jackets 50A and 50B can each include a first lap 53A and a second lap 53B respectively disposed on opposite sides of the body 51. (As shown in FIG. 14), when combined, the lap joints 53A and 53B are coupled to form a cylindrical reinforcing jacket 50 (as shown in FIG. 15).

16 to 18 illustrate a method of preparing a reinforcing jacket 60 according to another embodiment of the present invention. If the reinforcing cylinder is a rectangular cylinder, a reinforcing jacket 60 (shown in FIG. 16) may be formed by two U-shaped (semi-rectangular cylindrical) sub-jackets 60A and 60B, wherein the sub-jacket 60A And the laps 60A and 60B each include a first lap portion 63A and a second lap portion 63B, respectively disposed on the body 41. The opposite sides (as shown in FIG. 17) are coupled to form a rectangular column-shaped reinforcing jacket 60 (as shown in FIG. 18) by the combination of the overlapping portions 63A and 63B.

Fig. 19 is a view showing a reinforcing flow chart of a concrete column according to an embodiment of the present invention, and Fig. 20 is a view showing a reinforcing method of a concrete column (e.g., a cylindrical RC concrete column) 80 according to an embodiment of the present invention. In an embodiment of the present invention, the reinforcing method of the concrete column 80 is firstly prepared for construction (the inspection of the site site, the measurement and customization of the jacket size and the preparation of the material) and the repairing project (cleaning the surface of the RC concrete column) Dust removal, crack filling, paint removal and other damage repair works to make the surface flat).

After that, the epoxy resin is coated on the surface of the cylinder, and the remaining cylinders are uniformly coated on the surface of the cylinder with epoxy resin except for the reserved overlapping position, and the thickness of the epoxy resin is about 0.1 mm to 0.4 mm, wherein The epoxy resin glass has a transfer temperature (Tg) of 50 ° C to 100 ° C and a viscosity of 50,000 to 150,000 cps (centipoise centipoises). Next, the reinforcing jacket 40 (the reinforcing jacket 50 may also be coated) the concrete column 70, and the same epoxy resin as the body 41 is applied to the overlapping portion 43 and the corresponding cylindrical surface, and the epoxy resin is scraped with a doctor blade. Both of the coatings allow the resin to sufficiently wet the fibers of the lap portion 43.

After that, the OPP belt is wound around the reinforcing jacket 40 from the center to the sides, so that the outer surface of the reinforcing jacket 40 is covered by the OPP, and the tension of 3 to 6 kgf is applied when the OPP is wound, so that the reinforcing clamp is applied. The sleeve 40 fits snugly against the concrete column 70. The width of the OPP tape is preferably 2 to 10 cm and the thickness is 0.2 to 0.4 mm. When the OPP is wound, the entire reinforcing jacket 40 should be covered as much as possible. After 24 hours of curing, the OPP belt can be removed to complete the reinforcement project.

Figure 21 illustrates a method of reinforcing a concrete column (e.g., a cylindrical RC concrete column) 70 in accordance with another embodiment of the present invention. As shown in FIG. 20, the reinforcing jacket 40A of the reinforcing method of FIG. 21 includes a first overlapping portion 43 and a second overlapping portion 45 respectively disposed on adjacent sides of the body 41, wherein The second lap 45 is used to reinforce the base of the concrete column 70.

Figure 22 illustrates a method of reinforcing a concrete column (e.g., a rectangular RC concrete column) 80 in accordance with another embodiment of the present invention. In an embodiment of the present invention, the reinforcing method of the concrete column 80 is firstly prepared for construction (the inspection of the site site, the measurement and customization of the jacket size and the preparation of the material) and the repairing project (cleaning the surface of the RC concrete column) Dust removal, crack filling, paint removal and other damage repair works to make the surface flat).

After that, the epoxy resin is coated on the surface of the cylinder, and the remaining cylinders are uniformly coated on the surface of the cylinder with epoxy resin except for the reserved overlapping position, and the thickness of the epoxy resin is about 0.1 mm to 0.4 mm, wherein The epoxy resin glass has a transfer temperature (Tg) of 50 ° C to 100 ° C and a viscosity of 50,000 to 150,000 cps (centipoise centipoises). Next, the reinforcing jacket 60 is coated with the concrete column 80, and the same epoxy resin as the body 61 is applied to the overlapping portion 63 and the corresponding cylindrical surface, and the epoxy resin is coated with a doctor blade to sufficiently wet the resin. The fibers of the lap 63.

After that, the OPP belt is wound around the reinforcing jacket 40 from the center to the sides, so that the outer surface of the reinforcing jacket 60 is covered by the OPP, and the tension of 3 to 6 kgf is applied when the OPP is wound, so that the reinforcing clamp is applied. The sleeve 60 fits snugly against the concrete column 80. The width of the OPP tape is preferably 2 to 10 cm and the thickness is 0.2 to 0.4 mm, and the entire reinforcing jacket 60 should be covered as much as possible when the OPP is wound. After 24 hours of curing, the OPP belt can be removed to complete the reinforcement project.

The reinforcing jacket of the invention forms an integrated composite structure by bridging the cross-linking chemical reaction with the epoxy resin of the lap joint, and the composite structure is formed when the reinforcing cylinder is damaged by the reinforcing pillar. There is a lap joint failure at the lap joint, and the number of fibers at the lap joint is large or thick, including a better reinforcing effect. In addition, the reinforcing jacket of the present invention becomes less obvious due to the subsequent interface, and the transmission of the force during the load will be transmitted by the fiber having a larger modulus in the fiber composite material than by the polymer glue of the adhesive next to the surface. The failure mode of the load is changed to the failure mode of the entire composite material, thus including the optimum adhesion strength.

The technical content and the technical features of the present disclosure have been disclosed as above, but it should be understood by those skilled in the art that the disclosure and disclosure of the present disclosure should be made without departing from the spirit and scope of the disclosure as defined by the appended claims. Can be used for various substitutions and modifications. For example, many of the processes disclosed above may be implemented in different ways or in other processes, or a combination of the two.

Moreover, the scope of the present invention is not limited to the particular process, machine, manufacture, composition, means, method or method of the particular embodiments disclosed. It should be understood by those of ordinary skill in the art that, in light of the teachings of the present disclosure, the process, the machine, the manufacture, the composition of the material, the device, the method, or the steps, whether present or future developers, The revealer performs substantially the same function in substantially the same manner, and achieves substantially the same result, and can also be used in the present disclosure. Accordingly, the scope of the following claims is intended to cover such <RTIgt; </ RTI> processes, machines, manufactures, compositions, devices, methods or steps.

10‧‧‧One-piece jacket

11‧‧‧Mold

13‧‧‧Fiber

20‧‧‧Two-piece jacket

21‧‧‧ lap joint

23‧‧‧Ontology

30‧‧‧Reinforcing materials

31‧‧‧Fiber composite

33‧‧‧Ontology

35‧‧‧External Department

37‧‧‧Resin

39‧‧‧Mold

40‧‧‧Reinforcement jacket

41‧‧‧Ontology

43‧‧‧ lap joint

50. . . Reinforcement jacket

50A. . . Subjacket

50B. . . Subjacket

51. . . Ontology

53. . . Lap

53A. . . Lap

53B. . . Lap

60. . . Reinforcement jacket

60A. . . Subjacket

60B. . . Subjacket

61. . . Ontology

63. . . Lap

63A. . . Lap

63B. . . Lap

70. . . Concrete column

80. . . Concrete column

The technical features and advantages of the present disclosure are fully understood by reference to the foregoing description and the accompanying drawings.

FIG. 1 illustrates a conventional manual process for reinforcing a fiber composite material; FIG. 2 illustrates a conventional reinforcing process using a fiber composite jacket; and FIGS. 3 and 4 illustrate a conventional one-piece jacket; FIG. 6 and FIG. 6 illustrate a conventional two-piece jacket; FIG. 7 illustrates a flow chart for preparing a reinforcing jacket according to an embodiment of the present invention; and FIGS. 8 to 12 illustrate a method for preparing a reinforcing jacket according to an embodiment of the present invention; 15 to illustrate a method for preparing a reinforcing jacket according to another embodiment of the present invention; FIGS. 16 to 18 illustrate a method for preparing a reinforcing jacket according to another embodiment of the present invention; and FIG. 19 illustrates a concrete column according to an embodiment of the present invention. FIG. 20 illustrates a reinforcing method of a concrete column (for example, a cylindrical RC concrete column) according to an embodiment of the present invention; and FIG. 21 illustrates a concrete column (for example, a cylindrical RC concrete column) according to another embodiment of the present invention. A reinforcing method; and FIG. 22 illustrates a reinforcing method of a concrete column (for example, a rectangular RC concrete column) according to another embodiment of the present invention.

40. . . Reinforcement jacket

41. . . Ontology

43. . . Lap

70. . . Concrete column

Claims (22)

A reinforcing jacket comprising: a body comprising a fiber composite material impregnated with resin, and a first PET film and a second PET film respectively disposed on opposite surfaces of the fiber composite material of the resin impregnated resin; and a lap joint And disposed on a side of the body, the lap portion comprises a fiber composite material not impregnated with resin and the fiber composite material has a stalk shape. The reinforcing jacket of claim 1, comprising a first lap portion and a second lap portion respectively disposed on opposite sides of the body. The reinforcing jacket of claim 1, wherein the system has a cylindrical shape. The reinforcing jacket of claim 3, wherein the width of the overlapping portion is between 10 and 30% of the circumference of the body. The reinforcing jacket of claim 1, wherein the system has a rectangular column shape. The reinforcing jacket of claim 5, wherein the width of the overlapping portion is between 10% and 30% of the length of the side of the body. The reinforcing jacket of claim 1, wherein the system is semi-cylindrical. The reinforcing jacket according to claim 1, wherein the system has a semi-rectangular column shape. The reinforcing jacket of claim 1, comprising a first lap portion and a second lap portion respectively disposed on adjacent sides of the body. The reinforcing jacket of claim 1, wherein the resin comprises epoxy Resin. A reinforcing method for a concrete column, comprising the steps of: coating the concrete column with at least one reinforcing jacket, wherein the reinforcing jacket comprises: a body comprising a fiber composite material impregnated with resin, and a first PET film and a first Two PET films respectively disposed on two opposite surfaces of the fiber composite material of the resin impregnated; and a lap portion disposed on a side of the body, the lap portion comprising a fiber composite material not impregnated with the resin and the fiber composite material being The resin is coated on the lap so that the fiber composite material of the lap portion cross-links with the resin. The method for reinforcing a concrete column according to claim 11, further comprising the step of coating a resin on the surface of the concrete column. The method for reinforcing a concrete column according to claim 11, wherein the resin comprises an epoxy resin having a viscosity of between 50,000 and 150,000 cps and a glass transition temperature of between 50 and 100 °C. The method for reinforcing a concrete column according to claim 11, wherein the method further comprises: wrapping the reinforcing jacket with a belt. The reinforcing method of the concrete column according to the invention of claim 11, wherein the reinforcing jacket comprises a first overlapping portion and a second overlapping portion, respectively disposed on opposite sides of the body. A method for reinforcing a concrete column according to claim 11 of the patent application, wherein the The system is cylindrical. The method for reinforcing a concrete column according to claim 16, wherein the width of the lap portion is between 10 and 30% of the circumference of the body. The method for reinforcing a concrete column according to claim 11, wherein the system has a rectangular column shape. The method for reinforcing a concrete column according to claim 18, wherein the width of the lap portion is between 10% and 30% of the length of the side of the body. For the reinforcing method of the concrete column according to Item 11 of the patent application, two reinforcing jackets are used, and the system of each reinforcing jacket is semi-cylindrical. For the reinforcement method of the concrete column as described in claim 11, the two reinforcing jackets are used, and the system of each reinforcing jacket is semi-rectangular. The method for reinforcing a concrete column according to claim 11, wherein the reinforcing jacket comprises a first overlapping portion and a second overlapping portion respectively disposed on adjacent sides of the body.