JP6789092B2 - Strut reinforcement method and heating system - Google Patents

Description

The present invention relates to a reinforcing method and a heating system for reinforcing a support column including an obstacle such as a rib.

In recent years, the need for measures against aging of lighting pillars and sign pillars attached to roads has been advocated.
As the foundation structure of these metal pipe columns, there are those embedded in the foundation concrete and those bolted to the foundation concrete by the base plate structure.

For example, in Patent Document 1, as a reinforcing method for performing rust-preventive treatment and anti-corrosion treatment of columns, a field-cured soft carbon fiber-reinforced prepreg and a carbon fiber-reinforced plastic plate in which a fiber-reinforced prepreg is wound around a column to cure a resin are used. The method of strengthening the structure is disclosed.

Japanese Unexamined Patent Publication No. 1-197532 Japanese Unexamined Patent Publication No. 2000-18473

However, the method of reinforcing the columns has the following problems.
That is, in the support method for reinforcing the support disclosed in the above publication, no consideration is given to obstacles such as ribs provided on the outer peripheral surface of the support.

Therefore, when heating is performed using a normal band heater or hot air generator to cure the resin contained in the attached carbon fiber reinforced prepreg, heat is transferred to the bottom of the column, iron ribs, or the ground, and the resin is transferred. However, uniform heating cannot be performed, and there is a possibility that curing failure of the resin may occur.

In particular, it is difficult to efficiently transfer heat to the resin impregnated with the reinforcing fibers to cure the resin around obstacles such as ribs.

An object of the present invention is that when reinforcing a support column including obstacles such as ribs, the outer peripheral portion of the support column can be uniformly heated to effectively cure the resin impregnated in the reinforcing fibers. To provide a reinforcing method and a heating system.

The method for reinforcing the support column according to the first invention is a method for reinforcing the outer peripheral portion of the support column including obstacles by using reinforcing fibers, and includes a reinforcing fiber arranging step, a heating member mounting step, and a curing step. It has. In the reinforcing fiber arranging step, the reinforcing fibers impregnated with the uncured resin are arranged on the outer peripheral portion of the column. In the heating member mounting step, the strip-shaped heating member is wound around the outer peripheral surface of the reinforcing fiber. In the curing step, the heating system for driving the heating member is driven, and the first region is relative to the second region of the reinforcing fibers arranged at a position closer to the obstacle in the longitudinal direction of the column than the first region of the reinforcing fibers. The resin impregnated in the reinforcing fibers is cured by heating at a higher heating temperature.

Here, for example, in order to reinforce the outer peripheral portion of a column in which an obstacle such as a rib is arranged on the outer peripheral surface, when heat is applied to the resin impregnated in the reinforcing fiber to cure it, the outer peripheral surface of the reinforcing fiber is applied. It is higher than the second region of the reinforcing fiber arranged in the vicinity of the obstacle and higher than the first region arranged at a position away from the obstacle from the band-shaped heating member wound around the obstacle. The heating temperature is given.

Here, the columns to be reinforced include, for example, columns such as lighting lights and traffic lights installed at the roadside. Obstacles in the strut include ribs provided at the lower end of the strut, a box-shaped portion provided in the middle, and a portion protruding from the outer peripheral surface of the strut.

The second region of the reinforcing fiber arranged near the obstacle in the support column is provided near the lower end portion of the support column, for example, when the obstacle is a rib provided at the lower end portion of the support column. The first region is provided, for example, at a position adjacent to the upper side of the second region.

Further, as the heating member, for example, a band-shaped band heater containing a nichrome wire (heating wire) inside can be used.

Further, as the reinforcing fibers used for reinforcing the columns, for example, glass fibers, carbon fibers, acrylic fibers and the like can be used.

Further, as the resin impregnated in the reinforcing fibers, for example, a resin such as an epoxy resin, an acrylic resin, or an unsaturated polyester can be used.

In addition, in order to give a heating temperature higher than that of the first region to the second region in the heating member, for example, the first region and the second region are independently controlled separately to make a difference in the heating temperature. You may. Alternatively, if the first part and the second part of the heating member corresponding to the first region and the second region of the reinforcing fiber are used, for example, the density of the nichrome wire may be different between the first part and the second part.

As a result, for example, even when the outer peripheral portion of the support column including an obstacle such as a rib is reinforced, another region (first region) is compared with the region (second region) of the reinforcing fiber arranged in the vicinity of the obstacle. ) Can be heated at a higher temperature. Therefore, for example, even when heat is dissipated from an obstacle such as a rib and the temperature in the vicinity of the obstacle is difficult to rise, the reinforcing fibers are impregnated by applying sufficient heat to the region in the vicinity of the obstacle. It is possible to suppress the occurrence of poor curing of the resin.

As a result, when reinforcing the support column including obstacles such as ribs, the outer peripheral portion of the support column can be uniformly heated to effectively cure the resin impregnated in the reinforcing fibers.

The support method for reinforcing the support according to the second invention is a method for reinforcing the support according to the first invention, and the second region is a reinforcing fiber arranged in the vicinity of an obstacle provided near the lower end of the support. The first region is a region of reinforcing fibers adjacent to the second region in the longitudinal direction of the strut.

Here, with respect to the support column having an obstacle provided near the lower end portion, the second region of the reinforcing fiber is arranged near the obstacle, and the first region is arranged at a position adjacent above the obstacle.

As a result, for example, even when an obstacle such as a rib is provided near the lower end of the column, the second region to be heated at a high temperature is arranged near the connecting portion between the rib and the outer peripheral surface. The resin can be cured by heating the two regions substantially evenly with the first region.

The method for reinforcing the columns according to the third invention is the method for reinforcing the columns according to the first or second invention, and in the curing step, the first region and the second region of the reinforcing fibers are independent by the heating system. The heating is controlled.

Here, the heat applied from the heating member is controlled independently in the first region and the second region of the reinforcing fiber.

Thereby, for example, in the second region of the reinforcing fiber which is easily affected by heat radiation from obstacles such as ribs, the second region is independently controlled so as to be heated to substantially the same temperature as the first region. Can be done.

When the first region and the second region of the reinforcing fiber are independently heated and controlled, for example, the set temperature for the second region may be set higher than that of the first region. Alternatively, using a heating member in which the density of the nichrome wire in the portion with respect to the second region is higher than that in the portion with respect to the first region so that the second region is heated more than the first region even when the same current is applied. May be good.

The method for reinforcing the columns according to the fourth invention is a method for reinforcing the columns according to any one of the first to third inventions, and the curing step is performed in the first region and the second region in the longitudinal direction of the columns. It is performed by using a heating member divided into a plurality of parts so as to correspond to.

Here, as the heating member, a split structure is adopted in which a plurality of parts are arranged at positions corresponding to the first region and the second region of the reinforcing fiber and can be split in the longitudinal direction of the column.

Thereby, the heating control can be performed in the above-mentioned curing step by using the heating member that can be divided into the first part corresponding to the first region and the second part corresponding to the second region.

The support method for reinforcing the support according to the fifth invention is the method for reinforcing the support according to any one of the first to fourth inventions, and the heating member includes a nichrome wire for heat generation arranged inside and a nichrome wire for heat generation. It has a first portion arranged at a position corresponding to the first region of the reinforcing fiber and a second portion arranged at a position corresponding to the second region. The second part has a higher wiring density of nichrome wire than the first part.

Here, in the structure of the heat generating member that generates heat by passing an electric current through the nichrome wire provided inside, the first part that applies heat to the second region arranged in the vicinity of an obstacle such as a rib is the first part. It is configured so that the density of the nichrome wire is higher than that of the second part in which heat is applied to one region.

As a result, even when the same current is passed through the heating member, more heat is applied to the second region than in the first region, and the resin of the reinforcing fibers arranged in the vicinity of the obstacle is effectively cured. Can be made to.

The method for reinforcing the columns according to the sixth invention is a method for reinforcing the columns according to any one of the first to fifth inventions, and in the heating member attaching step, the heating member is temporarily reinforced by using a temporary fixture. After stopping, the heating member is tightened with a tightening tool in a state where the outer peripheral surface of the reinforcing fiber is wound.

Here, when the heating member is attached to the outer peripheral surface of the reinforcing fiber attached to the reinforcing portion of the column, the heating member is temporarily fixed by using a temporary fixing tool, and then the heating member is tightened by a fastener.

Here, the temporary fixing tool has, for example, an engaging portion including a lever member in which a ring-shaped member is rotatably supported, and a so-called engaged portion in which the ring-shaped member is locked. Snap locks and the like can be used.

Further, as the tightening tool, for example, a screw or the like whose tightening force for tightening the outer peripheral surface of the reinforcing fiber by the heating member can be adjusted can be used.

As a result, the heating member can be easily fixed to the outer peripheral surface of the reinforcing fiber attached to the reinforcing portion of the column by using the temporary fixing tool and the tightening tool.

The support method for reinforcing the support according to the seventh invention is the method for reinforcing the support according to any one of the first to sixth inventions, and is the outer peripheral surface of the support or the reinforcing fiber before the reinforcing fiber arranging step. An adhesive application step of applying an adhesive is further provided on the inner peripheral surface of the above.

Here, as a preliminary step for arranging the reinforcing fibers on the outer peripheral surface of the column, an adhesive for adhering the outer peripheral surface of the column and the inner peripheral surface of the reinforcing fiber is applied.

Here, as the adhesive to be applied, for example, a resin such as epoxy having a viscosity that does not drip in the reinforcing fiber arranging step can be used.

The adhesive to be applied may be applied to either the outer peripheral surface of the column or the inner peripheral surface of the reinforcing fiber, but may be applied to both surfaces.

As a result, the adhesive force of the adhesive can be utilized when the reinforcing fibers are attached to the outer peripheral surface of the column.

The heating system according to the eighth invention is a heating system that heats and cures an uncured resin impregnated in the reinforcing fibers when the outer peripheral portion of the support column including obstacles is reinforced with the reinforcing fibers. It is provided with a heating member that generates heat, a fixing portion, and a control portion. The fixing portion is fixed in a state where the heating member is wound around the outer peripheral surface of the column. The control unit heats the second region of the reinforcing fiber arranged at a position closer to the obstacle in the longitudinal direction of the column than the first region of the reinforcing fiber at a heating temperature higher than that of the first region.

Here, for example, in order to reinforce the outer peripheral portion of a column in which an obstacle such as a rib is arranged on the outer peripheral surface, when heat is applied to the resin impregnated in the reinforcing fiber to cure it, the outer peripheral surface of the reinforcing fiber is applied. It is higher than the second region of the reinforcing fiber arranged in the vicinity of the obstacle and higher than the first region arranged at a position away from the obstacle from the band-shaped heating member wound around the obstacle. The heating temperature is given.

Here, the columns to be reinforced include, for example, columns such as lighting lights and traffic lights installed at the roadside. Obstacles in the strut include ribs provided at the lower end of the strut, a box-shaped portion provided in the middle, and a portion protruding from the outer peripheral surface of the strut.

The second region of the reinforcing fiber arranged near the obstacle in the support column is provided near the lower end portion of the support column, for example, when the obstacle is a rib provided at the lower end portion of the support column. The first region is provided, for example, at a position adjacent to the upper side of the second region.

Further, as the heating member, for example, a band-shaped band heater containing a nichrome wire (heating wire) inside can be used.

Further, as the reinforcing fibers used for reinforcing the columns, for example, glass fibers, carbon fibers, acrylic fibers and the like can be used.

Further, as the resin impregnated in the reinforcing fibers, for example, a resin such as an epoxy resin, an acrylic resin, or an unsaturated polyester can be used.

In addition, in order to give a heating temperature higher than that of the first region to the second region in the heating member, for example, the first region and the second region are independently controlled separately to make a difference in the heating temperature. You may. Alternatively, if the first part and the second part of the heating member corresponding to the first region and the second region of the reinforcing fiber are used, for example, the density of the nichrome wire may be different between the first part and the second part.

As a result, for example, even when the outer peripheral portion of the support column including an obstacle such as a rib is reinforced, another region (first region) is compared with the region (second region) of the reinforcing fiber arranged in the vicinity of the obstacle. ) Can be heated at a higher temperature. Therefore, for example, even when heat is dissipated from an obstacle such as a rib and the temperature in the vicinity of the obstacle is difficult to rise, the reinforcing fibers are impregnated by applying sufficient heat to the region in the vicinity of the obstacle. It is possible to suppress the occurrence of poor curing of the resin.

As a result, when reinforcing the support column including obstacles such as ribs, the outer peripheral portion of the support column can be uniformly heated to effectively cure the resin impregnated in the reinforcing fibers.

The heating system according to the ninth invention is the heating system according to the eighth invention, and the second region is a region of reinforcing fibers arranged in the vicinity of an obstacle provided near the lower end of the column. The first region is a region of reinforcing fibers adjacent to the second region in the longitudinal direction of the column.

Here, with respect to the support column having an obstacle provided near the lower end portion, the second region of the reinforcing fiber is arranged near the obstacle, and the first region is arranged at a position adjacent above the obstacle.

As a result, for example, even when an obstacle such as a rib is provided near the lower end of the column, the second region to be heated at a high temperature is arranged near the connecting portion between the rib and the outer peripheral surface. The resin can be cured by heating the two regions substantially evenly with the first region.

The heating system according to the tenth invention is the heating system according to the eighth or ninth invention, and the control unit independently heats and controls the first region and the second region of the reinforcing fiber.

Here, the control unit independently controls the heat applied from the heating member in the first region and the second region of the reinforcing fiber.

Thereby, for example, in the second region of the reinforcing fiber which is easily affected by heat radiation from obstacles such as ribs, the second region is independently controlled so as to be heated to substantially the same temperature as the first region. Can be done.

When the first region and the second region of the reinforcing fiber are independently heated and controlled, for example, the set temperature for the second region may be set higher than that of the first region. Alternatively, using a heating member in which the density of the nichrome wire in the portion with respect to the second region is higher than that in the portion with respect to the first region so that the second region is heated more than the first region even when the same current is applied. May be good.

The heating system according to the eleventh invention is the heating system according to any one of the eighth to tenth inventions, and the heating member is arranged at a position corresponding to the first region in the longitudinal direction of the column. It has a divided structure including a first part and a second part arranged at a position corresponding to the second region.

Here, as the heating member, the reinforcing fibers are arranged at positions corresponding to the first region and the second region, respectively, and include a plurality of parts (parts 1 and 2) that can be divided in the longitudinal direction of the column. The structure is adopted.

Thereby, the above-mentioned heating control can be performed by using the heating member that can be divided into the first part corresponding to the first region and the second part corresponding to the second region.

The heating system according to the twelfth invention is the heating system according to the eleventh invention, and the heating member further has a nichrome wire for heat generation arranged inside. The second part has a higher wiring density of nichrome wire than the first part.

Here, in the structure of the heat generating member that generates heat by passing an electric current through the nichrome wire provided inside, the first part that applies heat to the second region arranged in the vicinity of an obstacle such as a rib is the first part. It is configured so that the density of the nichrome wire is higher than that of the second part in which heat is applied to one region.

As a result, even when the same current is passed through the heating member, more heat is applied to the second region than in the first region, and the resin of the reinforcing fibers arranged in the vicinity of the obstacle is effectively cured. Can be made to.

The heating system according to the thirteenth invention is a heating system according to any one of the eighth to twelfth inventions, and the fixing portion is a temporary fixing tool for temporarily fixing the heating member on the outer peripheral surface of the reinforcing fiber. It has a tightening tool for tightening the heating member temporarily fixed by the temporary fixing tool toward the outer peripheral surface of the reinforcing fiber.

Here, when the heating member is attached to the outer peripheral surface of the reinforcing fiber attached to the reinforcing portion of the column, the heating member is temporarily fixed by using a temporary fixing tool, and then the heating member is tightened by a fastener.

Here, the temporary fixing tool has, for example, an engaging portion including a lever member in which a ring-shaped member is rotatably supported, and a so-called engaged portion in which the ring-shaped member is locked. Snap locks and the like can be used.

Further, as the tightening tool, for example, a screw or the like whose tightening force for tightening the outer peripheral surface of the reinforcing fiber by the heating member can be adjusted can be used.

As a result, the heating member can be easily fixed to the outer peripheral surface of the reinforcing fiber attached to the reinforcing portion of the column by using the temporary fixing tool and the tightening tool.

According to the support method for reinforcing a support according to the present invention, when reinforcing a support including obstacles such as ribs, the outer peripheral portion of the support is uniformly heated to effectively cure the resin impregnated in the reinforcing fibers. be able to.

The perspective view which shows the structure of the support column which is reinforced by the support column reinforcement method which concerns on one Embodiment of this invention. A side view showing a state in which the support column of FIG. 1 is installed in the ground. FIG. 5 is a perspective view showing a configuration of a heating system attached to a support column in order to heat a resin impregnated in a reinforcing fiber that reinforces the support column of FIG. FIG. 5 is a perspective view showing a configuration of a heating system attached to a support column in order to heat a resin impregnated in a reinforcing fiber that reinforces the support column of FIG. FIG. 3 is a cross-sectional view showing a configuration of a fixed band, a heat soaking plate, and a band heater included in the heating system shown in FIGS. 3 and 4. The front view which shows the structure of the heating system shown in FIG. 3 and FIG. The front view which shows the structure of the fixing band included in the heating system of FIG. The front view which shows the state which the band heater included in the heating system of FIG. 6 is attached to the outer peripheral surface of the reinforcing fiber wound around the column. The flowchart which shows the flow of the reinforcement method of the column which concerns on one Embodiment of this invention.

The method of reinforcing the columns according to the embodiment of the present invention will be described below with reference to FIGS. 1 to 9.

The method for reinforcing the columns according to the present embodiment is a method for reinforcing a predetermined portion of the columns 50 shown in FIG. 1, and is carried out by using a heating system 10 described later.

(Structure of support column 50 to be reinforced)
The column 50 to be reinforced in the present embodiment is a tubular or columnar structure, for example, a column structure such as an illumination column and a sign column. As shown in FIG. 1, the support column 50 includes a cylindrical tube column portion 51, four ribs 52, and a base portion 53. Then, as shown in FIG. 2, the support column 50 is erected in a state where the lower end portion including the rib 52 and the base portion 53 is buried in soil or asphalt.

The column 50 to be reinforced may be an existing one or a newly installed one. Further, when the reinforcement target is the existing support column 50, the outer peripheral surface or the like may have already deteriorated.

When the existing support column 50 is to be reinforced, the reinforcement process is performed by digging up the soil or the like covering the lower part of the support column 50 buried in the ground.

The material of the support column 50 is not particularly limited, and examples thereof include a metal, a resin, and a cured mortar product.

The cross-sectional shape of the support column 50 is not particularly limited, and includes, for example, any shape including a circle and a polygon. Further, the support column 50 may have a solid structure or a hollow structure.

In the present embodiment, the reinforcing structure of the column 50 is impregnated with a resin described later on the entire circumference of the outer peripheral surface 51a of the pipe column 51 in the vicinity of the lower end portion of the column 50 buried in soil or the like in the longitudinal direction. It is configured by being covered with reinforcing fibers 20.

As shown in FIG. 1, the pipe column portion 51 is a cylindrical structure made of metal or the like, and four ribs 52 are joined to the lower end portion of the outer peripheral surface 51a by welding. Further, a base portion 53 is joined to the lower end of the pipe column portion 51 by welding.

Further, as shown in FIG. 2, the pipe column portion 51 has a lower end portion including the rib 52 and the base portion 53 buried in the ground.

As shown in FIG. 1, the four ribs 52 are provided at intervals of about 90 degrees in the circumferential direction so as to project along a direction substantially perpendicular to the outer peripheral surface 51a of the pipe column portion 51. Further, the four ribs 52 are joined to the base portion 53 and the outer peripheral surface 51a of the pipe column portion 51 by welding, respectively.

Here, these four ribs 52 serve as obstacles when the reinforcing fibers 20 described later are attached and fixed.

Further, as shown in FIG. 2, the four ribs 52 are buried in the ground in a state where the support columns 50 are installed.

The number of ribs 52, the installation interval, and the like are not limited to four and 90 degree intervals, and may be provided, for example, at six and 60 degree intervals.

As shown in FIG. 1, the base portion 53 is a base plate that supports the support column 50 at the lower end portion thereof, and is arranged along a direction substantially perpendicular to the axial direction of the pipe column portion 51.

Then, as shown in FIG. 2, the base portion 53 is buried in the ground together with the rib 52 in a state where the support column 50 is installed.

Then, in the method of reinforcing the support column 50 of the present embodiment, the resin impregnated by winding the reinforcing fiber 20 around the portion of the outer peripheral surface 51a of the pipe column portion 51 corresponding to the ground GL shown in FIG. The support column 50 is reinforced by curing the support column 50.

Since the periphery of the outer peripheral surface 51a of the pipe column portion 51 in the buried state corresponding to the ground GL is easily deteriorated, it is reinforced by the following reinforcement method using the heating system 10.

(Structure of heating system 10)
The heating system 10 of the present embodiment is used in a method of reinforcing the main support column 50 in order to reinforce a predetermined portion of the support column 50, and is impregnated with the reinforcing fibers 20 wound around the outer peripheral surface 51a of the pipe column portion 51. The uncured matrix resin is heated and cured.

More specifically, as shown in FIGS. 3 and 4, the heating system 10 is formed on a reinforcing fiber 20 wound around a portion corresponding to the ground GL on the outer peripheral surface 51a of the pipe column portion 51 in the buried state. Heat the impregnated matrix resin.

In this embodiment, in particular, in order to effectively heat and cure the matrix resin impregnated in the reinforcing fibers 20 arranged in the vicinity of the portion of the outer peripheral surface 51a of the support column 50 where obstacles such as ribs 52 are provided. In addition, it has the following configuration.

As the matrix resin impregnated in the reinforcing fiber 20, epoxy resin, dicyandiamide (DICY-7), 2-phenyl-4,5-dihydroxymethylimidazole 2PHZ-PW, and polymethacrylic acid ester-based organic fine particles may be used. it can.

Further, the reinforcing fiber 20 contains glass fiber as a fiber material.
Further, as shown in FIGS. 3 and 4, the reinforcing fibers 20 have a first region 20a arranged in the vicinity of the rib 52 in the longitudinal direction of the support column 50 and a second region 20a arranged adjacent to the upper side of the first region 20a. It has a region 20b.

The first region 20a is a region of the reinforcing fiber 20 arranged on the upper side, and is heated by the band heater 13a.

The second region 20b is a region of the reinforcing fibers 20 arranged in the vicinity of the rib 52, the base portion 53, and the like where the applied heat is easily dissipated, and is heated by the band heater 13b.

As shown in FIGS. 3 and 4, the heating system 10 includes three fixing bands (fixing portions) 11, a heat equalizing plate 12, upper and lower band heaters (heating members) 13a and 13b, and a control unit 15 (FIG. 3). 6 etc.).

(Fixed band 11)
The three fixing bands 11 are cylindrical fixing members, each having a split structure that can be divided into two parts. The fixing band 11 is arranged on the outermost peripheral side of the heating system 10 in order to fix the band heaters 13a, 13b and the like arranged on the inner peripheral side. Then, as shown in FIGS. 3 and 4, three fixing bands 11 are arranged at predetermined intervals in the longitudinal direction of the support column 50.

Each of the three fixing bands 11 has a snap lock (temporary fastener) 11a and a tightening screw (tightening tool) 11b on the outer peripheral surface of the band.

As shown in FIGS. 3 and 7, the snap lock 11a is provided with one or two snap locks 11 along the longitudinal direction of the support column 50 in order to temporarily fix the fixing band 11 to the outer peripheral surface of the reinforcing fiber 20. The snap lock 11a has an engaging portion including a lever member in which the ring-shaped member is rotatably supported, and an engaged portion in which the ring-shaped member is locked.

As a result, one end of the fixing band 11 divided into two can be easily connected by locking the ring-shaped member to the engaged portion and rotating the lever member.

Of the three fixed bands 11, the fixed band 11 arranged at the center of the support column 50 in the longitudinal direction has a longer length in the longitudinal direction of the support column 50 than the fixed bands 11 arranged vertically. Therefore, the fixing band 11 arranged at the center is provided with two snap locks 11a along the longitudinal direction of the support column 50.

Further, since the snap lock 11a has a general structure, detailed description thereof will be omitted here.

As shown in FIG. 4, two tightening screws 11b are provided on the outer peripheral surface of the fixing band 11 on the opposite side of the snap lock 11a along the longitudinal direction of the support column 50. Then, the tightening screw 11b is rotated in a screwed state to adjust the gap in the circumferential direction of the fixing bands 11 and 11 divided into two in the circumferential direction.

As a result, the inner diameter of the fixing band 11 temporarily fixed by the snap lock 11a can be adjusted, and the band heater 13 can be tightened by the fixing band 11.

That is, the tightening screw 11b adjusts the tightening force by adjusting the gap in the circumferential direction of the two-divided fixing band 11 by tightening the fixing band 11 temporarily fixed by the snap lock 11a toward the inner diameter side.

A heat equalizing plate 12 is attached to the inner peripheral surface side of the band heaters 13a and 13b arranged on the inner peripheral surface side of the fixed band 11.

(Heat plate 12)
The heat equalizing plate 12 is formed by using a copper plate material having a thickness t of 0.3 mm and a thermal conductivity of 372 W / m · K. Then, as shown in FIG. 5, the heat equalizing plate 12 is provided so as to fill the gap between the parts in the circumferential direction of the band heaters 13a and 13b that can be divided into two.

Further, the heat equalizing plate 12 is arranged on the inner peripheral side of the band heaters 13a and 13b divided into two, and the band heaters 13a and 13b are arranged in advance so as to protrude from one end in the circumferential direction of the band heaters 13a and 13b. It is fixed to the inner peripheral surface of 13b.

As a result, the other band heaters 13b, 13a divided into two in the circumferential direction are arranged so as to cover the outer peripheral surface of the portion of the heat soaking plate 12 protruding from the end portion of the band heaters 13a, 13b.

(Band heaters 13a, 13b)
The band heaters (heating members) 13a and 13b are band-shaped members including a heat-generating portion such as a nichrome wire inside, and are wound around the outer peripheral surface of the reinforcing fiber 20 as shown in FIG. Then, the band heaters 13a and 13b heat and cure the matrix resin impregnated in the reinforcing fibers 20 in a state of being wound around the outer peripheral surface of the reinforcing fibers 20.

The band heaters 13a and 13b have a structure divided into two in the circumferential direction of the support column 50. Then, the band heaters 13a and 13b are attached so as to cover the reinforcing portion on the outer peripheral surface 51a of the support column 50 by the adhesive applied to the inner peripheral surface side.

Further, as shown in FIG. 6, the band heater (first part) 13a heats the first region 20a of the reinforcing fiber 20 arranged at a position corresponding to the region above the reinforcing portion in the support column 50. It is arranged at a position away from the rib 52. That is, the band heater 13a is arranged above the band heater 13b.

As shown in FIG. 6, the band heater (second part) 13b is used to heat the second region 20b of the reinforcing fiber 20 arranged at a position corresponding to the region below the reinforcing portion in the support column 50. As shown in 8, it is arranged in the vicinity of the rib 52 of the support column 50.

Then, as shown in FIGS. 6 and 8, the band heaters 13a and 13b are connected to the control unit 15 via the lead wires 13c connected to the outer peripheral surface.

As shown in FIGS. 5 and 6, the lead wire 13c is an electrode portion provided on the outer peripheral surface of the band heaters 13a and 13b in order to supply an electric current to a heating portion such as a nichrome wire in the band heaters 13a and 13b. It is connected to and is led out to the outside of the fixed band 11.

(Control unit 15)
As shown in FIGS. 6 and 8, the control unit 15 is connected to the upper band heater 13a and the lower band heater 13b via the lead wires 13c and 13c.

Further, in the control unit 15, the amount of heat applied from the lower band heater 13b to the second region 20b of the reinforcing fiber 20 is applied from the upper band heater 13a to the first region 20a of the reinforcing fiber 20. The heating is controlled so that the amount of heat exceeds the amount of heat generated.

Specifically, the upper band heater 13a is heated and controlled at 1,250 W (220 V), and the lower band heater 13b is heated and controlled by 1,500 W (220 V), which is larger than the upper band heater 13a.

Here, the second region 20b of the reinforcing fiber 20 is arranged in the vicinity of the rib 52 of the support column 50. Therefore, when the band heater 13b to the second region 20b is heated at the same temperature as the band heater 13a, heat is dissipated from the ribs 52 and the like, and the second region 20b reaches the same temperature as the first region 20a. It is difficult to heat.

Therefore, in the heating system 10 of the present embodiment, as shown in FIG. 8, the second region 20b of the reinforcing fibers 20 arranged in the vicinity of the rib 52 is adjacent to the second region 20b of the second region 20b. Heating control is performed at a temperature higher than one region 20a.

At this time, the control unit 15 independently controls the band heaters 13a and 13b in order to separately heat and control the first region 20a and the second region 20b of the reinforcing fiber 20.

As a result, when the outer peripheral surface 51a of the support column 50 including obstacles such as ribs 52 is reinforced, it is higher than the first region 20a with respect to the second region 20b of the reinforcing fibers 20 arranged in the vicinity of the ribs 52. Can be heated at temperature.

Therefore, even when heat is dissipated from the rib 52 or the like and the temperature of the second region 20b is difficult to rise, the reinforcing fiber 20 is impregnated by applying sufficient heat to the second region 20b in the vicinity of the rib 52. It is possible to suppress the occurrence of curing failure of the matrix resin.

<Reinforcement method of support column 50>
As described above, the method for reinforcing the support column 50 of the present embodiment is carried out according to the flowchart shown in FIG. 9 in order to reinforce a predetermined portion of the support column 50.

Specifically, in the method of reinforcing the support column 50 of the present embodiment, heat is applied to the uncured matrix resin impregnated in the reinforcing fiber 20 wound around the outer peripheral surface 51a of the pipe column portion 51 to cure it. , Reinforce the column 50.

First, in step S1, adhesion for attaching the reinforcing fiber 20 to the outer peripheral surface 51a of the support column 50 on the inner peripheral surface side (outer peripheral surface 51a side of the support column 50) of the reinforcing fiber 20 impregnated with the uncured matrix resin. The agent is applied.

Further, as the adhesive, for example, a room temperature curable epoxy resin adhesive (Esdyne Joiner WG) can be used. The coating amount is, for example, 1,600 g / m ² .

Next, in step S2, the reinforcing fiber 20 coated with the adhesive on the inner peripheral surface side is attached to the reinforcing portion on the outer peripheral surface 51a of the support column 50.

In the present embodiment, the reinforcing fibers 20 extend the range from the vicinity of the four ribs 52 protruding from the outer peripheral surface 51a to the upper part thereof, centering on the portion corresponding to the ground GL (see FIG. 2) on the outer peripheral surface 51a of the support column 50. It will be reinforced.

Next, in step S3, a silicon-based release sheet (not shown) is attached to the outer peripheral surface of the reinforcing fiber 20 wound around the outer peripheral surface 51a of the support column 50.

In the release sheet, after the matrix resin impregnated in the reinforcing fibers 20 is cured by using the band heaters 13a and 13b described later, the outer peripheral surface of the reinforcing fibers 20 and the inner peripheral surface of the band heaters 13a and 13b are formed. It is used to prevent adhesion.

Next, in step S4, the band heaters 13a and 13b are temporarily fixed to the outer peripheral surface of the reinforcing fiber 20 by using the snap lock 11a and the tightening screw 11b provided on the fixing band 11.

Specifically, band heaters 13a and 13b are contact-arranged on the outer peripheral surface of the reinforcing fiber 20, and temporarily fixed by using three fixing bands 11 from the outer peripheral surface side thereof.

When temporarily fixing the band heaters 13a and 13b with the fixing band 11, the fixing band 11 is wound with the band heaters 13a and 13b attached to the outer peripheral surface of the reinforcing fiber 20, and the snap lock 11a is locked first. -After fixing, loosely tighten the tightening screw 11b.

Next, in step S5, the tightening screws 11b of the fixing band 11 are tightened, and the band heaters 13a and 13b are tightened toward the reinforcing fibers 20 arranged on the inner peripheral surface side. The tightening torque of the tightening screw 11b is about 0.5 to 1.5 Nm.

Next, in step S6, the band heaters 13a and 13b are heated to a predetermined temperature. In the present embodiment, heating control is performed until the band heaters 13a and 13b are in the range of 150 to 180 ° C.

At this time, the upper band heater 13a is heated and controlled at 1,250 W (220 V), and the lower band heater 13b is heated and controlled at 1,500 W (220 V), which is larger than the upper band heater 13a. To.

As a result, the second region 20b of the reinforcing fiber 20 can be heated from the lower band heater 13b at a temperature higher than that of the upper band heater 13a.

Next, in step S7, the surface temperature of the reinforcing fiber 20 is measured, and the band heaters 13a and 13b are independently heated and controlled until the surface temperature of the reinforcing fiber 20 arranged in the vicinity of the rib 52 exceeds 130 ° C. To.

Next, in step S8, after being heated to a predetermined temperature by the band heaters 13a and 13b, heating is continued until a predetermined time elapses. In this embodiment, the predetermined time is set to 10 minutes.

As a result, the reinforcing fibers 20 that have been heated for a predetermined time are heated by the lower band heater 13b arranged in the vicinity of the ribs 52 of the support columns 50 at a heating temperature higher than that of the upper band heater 13a. Therefore, in the reinforcing fiber 20, sufficient heat is applied to the second region 20b in the vicinity of the rib 52 as in the case of the first region 20a, and the impregnated matrix resin is cured.

As a result, in the support column 50 having an obstacle such as a rib 52 on the outer peripheral surface 51a, it is possible to suppress the occurrence of curing failure of the matrix resin in the second region 20b of the reinforcing fiber 20 provided in the portion close to the rib 52. ..

Next, in step S8, after loosening the tightening screw 11b of the fixing band 11 and removing the fixing band 11, the band heaters 13a and 13b and the release sheet are removed from the outer peripheral surface of the reinforcing fiber 20.

According to the method for reinforcing the support column 50 of the present embodiment, as described above, when the outer peripheral surface 51a of the support column 50 including obstacles such as the rib 52 is reinforced, the reinforcing fibers 20 arranged in the vicinity of the rib 52 The second region 20b can be heated at a higher temperature than the first region 20a.

Therefore, even when heat is dissipated from the rib 52 or the like and the temperature of the second region 20b is difficult to rise, the reinforcing fiber 20 is impregnated by applying sufficient heat to the second region 20b in the vicinity of the rib 52. It is possible to suppress the occurrence of curing failure of the matrix resin.

[Other Embodiments]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the invention.

(A)
In the above embodiment, the heating temperature of the lower band heater 13b close to the rib 52 in the longitudinal direction of the support column 50 is set higher than that of the upper band heater 13a, and the band heater 13a and the band heater 13b are heated independently. An example of control has been described. However, the present invention is not limited to this.

For example, a heating system including a band heater in which the wiring density of the nichrome wire contained in the lower band heater is higher than the wiring density of the nichrome wire contained in the upper band heater may be used.

Even in this case, since the amount of heat applied from the lower band heater near the obstacle such as the rib can be increased as compared with the upper band heater, the reinforcing fiber arranged in the vicinity of the obstacle such as the rib can be used. On the other hand, it can be sufficiently heated.

(B)
In the above embodiment, the step of temporarily fixing and tightening the band heaters 13a and 13b to the outer peripheral surface of the reinforcing fiber 20 is carried out by using the snap lock 11a and the tightening screw 11b as temporary fixing tools included in the fixing band 11. Was explained. However, the present invention is not limited to this.

For example, the band heater may be fixed by using other fixing members in addition to the combination of the snap lock and the tightening screw.

(C)
In the above embodiment, when the reinforcing fiber 20 is arranged on the outer peripheral surface 51a of the support column 50, an adhesive is applied to the inner peripheral surface side of the reinforcing fiber 20, and the reinforcing fiber 20 is placed on the support column 20 by utilizing the adhesive force of the adhesive. An example of fixing to 50 reinforcing points has been described. However, the present invention is not limited to this.

For example, the reinforcing fibers may be fixed to the outer peripheral surface of the column by curing the matrix resin impregnated in the reinforcing fibers without using an adhesive.

Further, even when an adhesive is used, it may be applied to the outer peripheral surface side of the column instead of the inner peripheral surface side of the reinforcing fiber. Alternatively, an adhesive may be applied to both the inner peripheral surface of the reinforcing fiber and the outer peripheral surface of the column.

(D)
In the above embodiment, an example in which four ribs 52 are provided as obstacles at the time of reinforcement on the outer peripheral surface 51a of the support column 50 has been described. However, the present invention is not limited to this.

For example, the number of ribs provided on the outer peripheral surface of the column is not limited to four, and may be another number such as 5, 6, 8, or the like.

In addition to the ribs, the present invention can also be applied to the reinforcement of a support column in which a box-shaped portion provided in the middle of the support column, a portion protruding from the outer peripheral surface of the support column, etc. are provided as obstacles. Is.

(E)
In the above embodiment, an example in which an epoxy resin is used as the matrix resin impregnated in the reinforcing fiber 20 has been described. However, the present invention is not limited to this.

For example, other thermosetting resins such as unsaturated polyester, acrylic resin, vinyl ester resin, alkyd resin, amino resin, urethane resin, phenol resin, and silicon resin may be used.

(F)
In the above embodiment, an example in which glass fiber is used as the fiber material contained in the reinforcing fiber 20 has been described. However, the present invention is not limited to this.

For example, the fiber material contained in the reinforcing fiber is not limited to glass fiber, and for example, metal fiber and other inorganic fibers; carbon fiber, aramid fiber, polyvinyl alcohol fiber, vinyl chloride fiber, acrylic fiber, polyester fiber, etc. Polyurethane fiber, polyethylene fiber, polypropylene fiber, polystyrene fiber, acetate fiber and other organic synthetic fibers; hemp and bamboo and other natural fibers; and rayon and other regenerated fibers may be selected and used.

Further, as the fiber material contained in the above-mentioned reinforcing fibers, one type of fiber material may be used alone, or a plurality of types of fiber materials may be used in combination.

(G)
In the above embodiment, an example in which a copper plate material having a thickness t of 0.3 mm is used as the heat equalizing plate 12 has been described. However, the present invention is not limited to this.

For example, in addition to copper, a heat equalizing plate formed of another metal such as aluminum may be used as long as it is a metal having a high thermal conductivity of 200 W / m · K or more.

In the method for reinforcing a column of the present invention, when reinforcing a column containing obstacles such as ribs, the outer peripheral portion of the column can be uniformly heated to effectively cure the resin impregnated in the reinforcing fibers. Therefore, it can be widely applied to the method of reinforcing various pillars such as lighting pillars and sign pillars attached to roads.

10 Heating system 11 Fixed band (fixed part)
11a Snap lock (temporary fastener)
11b Tightening screw (tightening tool)
12 Heat soaking plate 13a Band heater (heating member, part 1)
13b band heater (heating member, part 2)
13c Lead wire 15 Control unit 20 Reinforcing fiber 20a First area 20b Second area 50 Strut 51 Pipe column 51a Outer peripheral surface 52 Ribs (obstacles)
53 Base GL ground (ground level)
S step

Claims (13)

It is a method of reinforcing the outer peripheral portion of the support column including obstacles by using reinforcing fibers.
A reinforcing fiber arranging step of arranging a reinforcing fiber impregnated with an uncured resin on the outer peripheral portion of the support column,
A heating member mounting process in which a band-shaped heating member is wound around the outer peripheral surface of the reinforcing fiber and mounted.
The first region of the reinforcing fiber, which drives the heating system for driving the heating member and is arranged at a position closer to the obstacle in the longitudinal direction of the support column than the first region of the reinforcing fiber. A curing step of heating at a heating temperature higher than one region to cure the resin impregnated in the reinforcing fibers, and
How to reinforce the stanchions that are equipped with. The second region is a region of the reinforcing fiber arranged in the vicinity of the obstacle provided near the lower end of the support.
The first region is a region of the reinforcing fiber adjacent to the second region in the longitudinal direction of the strut.
The method for reinforcing a support according to claim 1. In the curing step, the first region and the second region of the reinforcing fiber are independently heated and controlled by the heating system.
The method for reinforcing a support according to claim 1 or 2. The curing step is performed using the heating member divided into a plurality of parts in the longitudinal direction of the column so as to correspond to the first region and the second region.
The method for reinforcing a support column according to any one of claims 1 to 3. The heating member is arranged in a nichrome wire for heat generation arranged inside, a first part arranged at a position corresponding to the first region of the reinforcing fiber, and a position corresponding to the second region. With the second part,
The second part has a higher wiring density of the nichrome wire than the first part.
The method for reinforcing a support column according to any one of claims 1 to 4. In the heating member attaching step, after temporarily fixing the heating member with a temporary fixing tool, the heating member is tightened with a fastener in a state where the outer peripheral surface of the reinforcing fiber is wound.
The method for reinforcing a support column according to any one of claims 1 to 5. Prior to the reinforcing fiber arranging step, an adhesive applying step of applying an adhesive to the outer peripheral surface of the support column or the inner peripheral surface of the reinforcing fiber is further provided.
The method for reinforcing a support column according to any one of claims 1 to 6. A heating system that heats and cures an uncured resin impregnated in the reinforcing fibers when the outer peripheral portion of the support column including obstacles is reinforced with reinforcing fibers.
A heating member that generates heat and
A fixing portion for fixing the heating member in a wound state on the outer peripheral surface of the support column,
A control unit that heats a second region of the reinforcing fiber arranged at a position closer to the obstacle in the longitudinal direction of the column than the first region of the reinforcing fiber at a heating temperature higher than that of the first region. When,
The heating system is equipped with. The second region is a region of the reinforcing fiber arranged in the vicinity of the obstacle provided near the lower end of the support.
The first region is a region of the reinforcing fiber adjacent to the second region in the longitudinal direction of the strut.
The heating system according to claim 8. The control unit independently heats and controls the first region and the second region of the reinforcing fiber.
The heating system according to claim 8 or 9. The heating member has a divided structure including a first portion arranged at a position corresponding to the first region in the longitudinal direction of the support column and a second portion arranged at a position corresponding to the second region. Have, have
The heating system according to any one of claims 8 to 10. The heating member further has a nichrome wire for heat generation arranged inside.
The second part has a higher wiring density of the nichrome wire than the first part.
The heating system according to claim 11. The fixing portion tightens the temporary fixing tool that temporarily fixes the heating member on the outer peripheral surface of the reinforcing fiber and the heating member that is temporarily fixed by the temporary fixing tool toward the outer peripheral surface of the reinforcing fiber. Has a fastener,
The heating system according to any one of claims 8 to 12.

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