JP6855151B1 - Reinforcement steel plate assembly and existing structure reinforcement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing steel plate assembly and a method for reinforcing an existing structure, which do not require temporary work for securing a work space such as earth retaining and can press-fit a reinforcing steel plate even when an unbalanced pressure acts. SOLUTION: In a reinforcing steel plate assembly 1 assembled from a plurality of reinforcing steel plates 2 used for seismic reinforcement of a columnar existing structure (pier P1), a plurality of reinforcing steel plates 2 are joined to form an existing structure ( A reinforcing steel plate assembly main body 3 assembled in a tubular shape having a similar cross-sectional shape separated from the cross-sectional shape of the pier P1) by a certain distance, and projecting inward from the inner peripheral surface 3a of the reinforcing steel plate assembly main body 3. A plurality of spacers 4 for securing a space for filling the filler 6 with the existing structure (pier P1), and at least one of these plurality of spacers 4 are axially supported in the horizontal direction in the vertical direction. Is provided with a rotatable roller 5. [Selection diagram] Fig. 2

Description

The present invention relates to a reinforcing steel plate assembly assembled from a plurality of reinforcing steel plates used for seismic retrofitting of a columnar existing structure such as a pier, and a method for reinforcing the existing structure using the same. The present invention relates to a reinforcing steel plate assembly with a steel plate and a method for reinforcing an existing structure using the same.

Conventionally, as a seismic retrofitting method for existing RC piers, an RC winding method, a steel plate winding method, and the like are known. However, these construction methods required the installation of earth retaining and temporary deadlines such as steel sheet piles, excavation within the deadlines, and drainage to secure a work space. For this reason, under severe constraint conditions directly under the existing structure, the steel sheet pile is short and requires many joint constructions, which causes problems such as difficulty in construction, long construction period, and high construction cost. ..

In order to solve such a problem, in Patent Document 1, a steel plate is wound around an existing RC pier proposed by the applicant of the present application, press-fitted, and integrated with the existing pier by an underwater non-separable non-shrink mortar. A press-fitting device for seismic retrofitting of existing RC piers for seismic retrofitting and a steel plate press-fitting method using the same are disclosed (paragraphs [0026] to [0030] in the specification of Patent Document 1, FIGS. 8 to 8 of the drawing. See FIG. 14 and the like).

The press-fitting device described in Patent Document 1 and the steel plate press-fitting method using the same do not require temporary work for securing a work space such as earth retaining with steel sheet piles and temporary deadlines, and excavation is performed with steel plates and existing piers. Because it is limited to a small gap, the construction cost and construction period can be reduced, and it is also environmentally friendly. In addition, since it is a press-fitting method, it has an excellent feature that reinforcement work can be performed even under construction conditions such as embankments that cannot be excavated.

Further, in Patent Document 2, a buckling prevention member is provided on the reinforcing steel plate, and a spacer for forming a predetermined gap between the side wall of the pier and the reinforcing steel plate when the buckling prevention material is press-fitted by the press-fitting device. A reinforcing structure of a columnar structure and a method of reinforcing the columnar structure are disclosed (see paragraph [0037] of the specification of Patent Document 2, FIGS. 1 to 4, 9, 10 and the like). ..

The reinforcing structure of the columnar structure and the method of reinforcing the columnar structure described in Patent Document 2 receive the reaction force of the telescopic jack because the bending moment acting at the time of press-fitting the steel plate can be received by the arm and the bearing plate and transmitted to the pier. It had the excellent feature that the structure on the side could be miniaturized to make it an economically inexpensive press-fitting device.

However, the press-fitting device described in Patent Document 1, the steel plate press-fitting method using the same, and the reinforcing structure of the columnar structure and the reinforcing method of the columnar structure described in Patent Document 2 are earth pressure (unbalanced pressure) on slopes and the like. When the reinforcing steel plate is press-fitted in a state where is acting, the earth pressure (unbalanced pressure) on the mountain side acts on the reinforcing steel plate, so that the reinforcing steel plate is pushed to the valley side and protrudes into the existing structure inside the reinforcing steel plate. There was a problem that the spacers interfered and damaged the existing structure. Further, there is a problem that the spacer interferes with the existing structure, which causes a press-fitting resistance and hinders the press-fitting of the reinforcing steel plate.

In order to solve such a problem, it is conceivable to install earth retaining so as not to apply earth pressure to the reinforcing steel plate, but it is restricted to install earth retaining under narrow working conditions such as slopes. There are many conditions, and there is a problem that workability and economic efficiency deteriorate.

Japanese Unexamined Patent Publication No. 2012-167744 Japanese Unexamined Patent Publication No. 2014-141829

Therefore, the present invention has been devised in view of the above-mentioned problems, and the purpose of the present invention is that temporary work for securing a work space such as earth retaining is not required, and an unbalanced pressure acts. Also, it is an object of the present invention to provide a method for reinforcing a reinforcing steel plate assembly and an existing structure capable of press-fitting a reinforcing steel plate.

The reinforcing steel plate assembly according to claim 1 is a reinforcement assembled from a plurality of reinforcing steel plates used as seismic reinforcement of a columnar existing structure in which one or both of earth pressure and hydraulic pressure acting from the outside are biased. A steel plate assembly body, wherein a plurality of the reinforcing steel plates are joined to form a tubular shape having a similar cross-sectional shape separated from the cross-sectional shape of the existing structure by a certain distance, and the above-mentioned A plurality of spacers projecting inward from the inner peripheral surface of the main body of the reinforced steel sheet assembly to secure a space for filling the filler with the existing structure, and lateral to at least one of the plurality of spacers. The spacer is provided with a roller that is axially supported in the direction and is rotatable in the vertical direction, the roller is provided only on the side where the pressure acting from the outside is high, and the spacer is a spacer with a roller to which a roller is attached to an inner end. It is characterized in that it is provided with two types of spacers, one is a spacer without a roller and the other is not attached with a roller at the inner end.

The reinforced steel plate assembly according to claim 2 is the reinforced steel plate assembly according to claim 1, wherein the roller is attached to the spacer via a spring material.

Method for reinforcing existing structures according to claim 3 is a method for reinforcing existing structures to reinforce by installing reinforcing steel assembly according to claim 1 or 2 around the columnar existing structures, the It has a press-fitting step of press-fitting the reinforced steel sheet assembly, and in the press-fitting step, the roller is brought into contact with the existing structure and rolled to reduce the pressure at which the spacer is pressed against the existing structure and press-fitted. It is characterized by that.

The method for reinforcing an existing structure according to claim 4 is a method for reinforcing an existing structure by installing and reinforcing the reinforcing steel plate assembly according to claim 2 around the columnar existing structure. It has a press-fitting step of press-fitting the assembly, and in the press-fitting step, the roller is brought into contact with the existing structure and rotated to reduce the pressure at which the spacer is pressed against the existing structure, and the press-fitting is performed. It is characterized in that the roller is urged by a spring material so as to press against the existing structure, and the reinforcing steel plate assembly is press-fitted while following the unevenness of the outer peripheral surface of the existing structure.

According to the inventions according to claims 1 to 4 , a reinforcing structure such as a pier is installed on a slope or the like, and the reinforcing steel plate is press-fitted without damaging the structure even under conditions where an unbalanced pressure acts from the outside. Reinforcement work can be carried out. Further, according to the inventions of claims 1 to 4 , since the roller is provided between the spacer and the existing structure, the press-fitting resistance can be suppressed and the press-fitting of the reinforcing steel plate can be smoothly performed. According to the inventions of claims 1 to 4 , temporary work for securing a work space such as earth retaining is not required, and the workability and economic efficiency of the reinforcement work are improved even under difficult conditions. .. Further, according to the inventions of claims 1 to 4, since the rollers are provided only on the side where the pressure acting from the outside is high, unnecessary rollers are reduced while exerting the above-mentioned working effects, and the reinforcing steel plate is reinforced. The manufacturing cost of the assembly can be reduced. Further, according to the invention of claim 2, since two types of spacers, a spacer with a roller and a spacer without a roller, are provided, the reinforcing steel plate assembly is reinforced at an appropriate position even when an unbalanced pressure is applied to the reinforcing steel plate assembly during press fitting. The steel plate assembly can be guided and press-fitted.

In particular, according to the invention of claim 2 , since the roller is attached to the spacer via the spring material, the external pressure applied to the reinforcing steel plate assembly follows the unevenness of the outer peripheral surface of the existing structure with the spring material. It can be transmitted to the existing structure with less bias. Therefore, not only the risk of damaging the existing structure can be further reduced, but also the press-fitting resistance can be further suppressed, and the press-fitting of the reinforcing steel sheet can be smoothly performed.

In particular, according to the invention of claim 3 , since the roller is brought into contact with the existing structure and rolled to reduce the pressure at which the spacer is pressed against the existing structure and press-fitted, the press-fitting resistance is suppressed and the reinforcing steel plate is reinforced. Can be pressed in smoothly.

In particular, according to the invention of claim 4 , the spring material urges the roller to press against the existing structure and press-fits the roller while following the unevenness of the outer peripheral surface of the existing structure. It is possible to reduce the bias of the external pressure applied to the existing structure and transmit it to the existing structure. Therefore, not only the risk of damaging the existing structure can be further reduced, but also the press-fitting resistance can be further suppressed, and the press-fitting of the reinforcing steel sheet can be smoothly performed.

FIG. 1 is a side view showing a pier reinforced by the reinforced steel plate assembly according to the embodiment of the present invention. FIG. 2 is a horizontal cross-sectional view showing a pier reinforced with the same reinforced steel plate assembly. FIG. 3 is an enlarged view of part A of FIG. FIG. 4 is an enlarged view of part B of FIG. FIG. 5 is a cross-sectional view taken along the line CC of FIG. FIG. 6 is a flowchart showing each step of the method for reinforcing the existing structure according to the present embodiment. FIG. 7 is a process explanatory view showing a reaction force steel plate installation process of the method for reinforcing an existing structure according to the present embodiment. FIG. 8 is a process explanatory view showing a press-fitting device installation process of the method for reinforcing the existing structure according to the present embodiment. FIG. 9 is a process explanatory view showing a reinforcing steel plate assembling process of the method for reinforcing the existing structure according to the present embodiment. FIG. 10 is a process explanatory view showing a press-fitting process of the method for reinforcing the existing structure according to the present embodiment.

Hereinafter, an embodiment of a method for reinforcing a reinforcing steel plate assembly and an existing structure according to the present invention will be described in detail with reference to the drawings.

[Reinforcing steel plate assembly]
First, the reinforcing steel plate assembly according to the embodiment of the present invention will be described with reference to FIGS. 1 to 5. In the present embodiment, the reinforced concrete pier P1 of the existing bridge B1 will be illustrated and described as an existing structure for seismic retrofitting. FIG. 1 is a side view showing a pier P1 reinforced by the reinforced steel plate assembly 1 according to the embodiment of the present invention, and FIG. 2 is a horizontal cross section of the pier P1 reinforced by the reinforced steel plate assembly 1 according to the present embodiment. It is a figure. Further, as shown in FIG. 1, this pier P1 is installed on a slope SG, and an unbalanced earth pressure in which the earth pressure on the mountain side is higher than the earth pressure on the valley side acts as an external pressure on the pier P1. There is.

As shown in FIGS. 1 and 2, the reinforcing steel plate assembly 1 according to the present embodiment has a reinforcing steel plate assembly main body 3 to which a plurality of reinforcing steel plates 2 are joined and an inner circumference of the reinforcing steel plate assembly main body 3. It is composed of a plurality of spacers 4, ..., 4 projecting inward from the surface, and a roller 5 that is axially supported by the plurality of spacers 4 and is rotatable in the vertical direction. As shown in FIG. 2, the gap between the reinforcing steel plate assembly 1 and the pier P1 which is an existing structure is filled with a filler 6 such as mortar or concrete which is a time-curing material that is cured by a hydration reaction. The reinforcing steel plate assembly 1 and the pier P1 are integrated.

(Reinforcing steel plate)
The reinforcing steel plate 2 is a rectangular (rectangular) steel plate having a predetermined thickness (9 mm in the figure) according to the structural design. Of course, it goes without saying that the shape and thickness of the reinforcing steel plate 2 may be appropriately set according to the cross-sectional shape and structural design of the existing structure to be reinforced.

(Reinforcing steel plate assembly body)
The reinforcing steel plate assembly main body 3 is assembled into a tubular shape having a cross-sectional shape similar to the cross-sectional shape of the pier P1 which is separated from the outer peripheral side surface of the pier P1 by a certain distance by welding and joining the end faces of the plurality of reinforcing steel plates 2. ing. In the present embodiment, the reinforcing steel plates 2 are joined by welding, but mechanical joining such as rivet joining or bolt joining may be used.

Further, as shown in FIGS. 1 and 2, the pier P1 exemplified as the existing structure has a rectangular cross section (rectangular), and the cross-sectional shape of the reinforcing steel plate assembly main body 3 is also rectangular (rectangular). It has become. A gap G1 is formed at a certain distance (100 mm in this embodiment) between the inner peripheral surface 3a of the reinforcing steel plate assembly main body 3 and the outer peripheral side surface of the pier P1, and the gap G1 is filled with the filler 6. There is.

(Spacer)
The spacer 4 is made of a predetermined steel material according to the required strength such as a buckling prevention function, and has a strip shape extending vertically from the inner peripheral surface 3a of the reinforcing steel plate assembly main body 3 to the inside on the pier P1 side. It is a member in which a flat plate steel material 42 extending in the vertical direction is vertically joined to the inner end of the inner surface of the steel material 41. The spacer 4 has a function of securing a space for filling the filler 6 between the inner peripheral surface 3a and the pier P1 and a function of preventing the reinforcing steel plate 2 from buckling when the reinforcing steel plate assembly 1 is press-fitted. doing.

Further, the spacer 4 is provided with two types of spacers, a spacer 4a with a roller to which the roller 5 described later is attached to the inner end, and a spacer 4b without a roller to which such a roller 5 is not attached to the inner end. ing. As shown in FIG. 2, spacers 4a with rollers are provided on the mountain side and the side surface side of the pier P1 to which high earth pressure is applied due to the slope SG, and spacers 4b without rollers are provided on the valley side where the earth pressure is relatively small. It is provided.

FIG. 3 is an enlarged view of part A of FIG. 2, and FIG. 4 is an enlarged view of part B of FIG. Further, FIG. 5 is a cross-sectional view taken along the line CC of FIG. As shown in FIGS. 3 and 5, the protruding length L1 of the spacer 4a with rollers is about 53 mm, which is about half of the gap G1, and as shown in FIG. 4, the protruding length of the spacer 4b without rollers is about 53 mm. L2 is about 90 mm with a play of about 10 mm, which is slightly shorter than the gap G1.

(roller)
As shown in FIG. 3, the roller 5 has a pair of spring materials 7 made of coil springs and a pair of L-shaped angles 8 which are a pair of angle steel materials on the inner surface of the flat plate steel material 42 which is the inner end of the spacer 4a with rollers. It is attached via. Needless to say, the spring material 7 is not limited to the coil spring, and may be another spring material such as a leaf spring.

Specifically, a spring material 7 is interposed between the flat plate steel material 42 of the spacer 4a with rollers and the pair of L-shaped angles 8, and the rollers 5 are horizontally (horizontally) axial to the L-shaped angles 8. It is supported. Therefore, the roller 5 is vertically rotatable, and has a structure in which the frictional resistance between the spacer 4a with rollers and the pier P1 at the time of press fitting of the reinforcing steel plate assembly 1 is extremely reduced. Further, it is possible to prevent the stress from being concentrated on the convex portion of the outer peripheral side surface of the pier P1 and a part of the rollers 5 due to the unevenness of the outer peripheral side surface of the pier P1 by the spring material 7.

[Reinforcement method for existing structures]
Next, a method of reinforcing the existing structure according to the embodiment of the present invention will be described with reference to FIGS. 6 to 10. An example will be described in which the above-mentioned reinforcing steel plate assembly 1 is installed and reinforced around the reinforced concrete pier P1 of the existing bridge B1 constructed on the above-mentioned slope SG. FIG. 6 is a flowchart showing each process of the method for reinforcing the existing structure according to the present embodiment, and FIG. 7 is a process description showing the process for installing the reaction force steel plate of the method for reinforcing the existing structure according to the present embodiment. It is a figure.

(1. Steel plate installation process for reaction force)
As shown in FIGS. 6 and 7, in the method of reinforcing the existing structure according to the present embodiment, first, a reaction force steel plate installation step of installing the reaction force steel plate on the bridge pier P1 which is the existing structure is performed.

Specifically, in this step, a post-construction anchor is installed on the upper part of the pier P1, and then bolted to the construction anchor to fix and install the reaction force steel plate S1.

(2. Press-fitting device installation process)
As shown in FIGS. 6 and 8, in the method of reinforcing the existing structure according to the present embodiment, next, the press-fitting device installation step of attaching the press-fitting device M1 to the reaction force steel plate S1 installed in the previous step is performed. Do. FIG. 8 is a process explanatory view showing a press-fitting device installation process of the method for reinforcing the existing structure according to the present embodiment.

Specifically, in this step, the press-fitting device M1 is supported and fixed on the upper part of the bridge pier P1 by bolting to the reaction force steel plate S1. Of course, the support and fixing of the press-fitting device M1 to the pier P1 is not limited to bolt joints, and it goes without saying that the press-fitting device M1 may be fixed in any way.

This press-fitting device M1 is a linear motion mechanism driven by flood control, and a plurality of telescopic jacks M10 for press-fitting the above-mentioned reinforcing steel plate assembly 1 and the pressure of these telescopic jacks M10 are evenly transmitted to the reinforcing steel plate assembly 1. It is composed of a pressing jig M11 made of a steel material and the like.

(3. Reinforcing steel sheet assembly process)
As shown in FIGS. 6 and 9, in the method of reinforcing the existing structure according to the present embodiment, next, a reinforcing steel plate assembling step of assembling one stage of the reinforcing steel plate assembly 1 on the slope SG is performed. FIG. 9 is a process explanatory view showing a reinforcing steel plate assembling process of the method for reinforcing the existing structure according to the present embodiment.

Specifically, in this step, the left and right end faces of the above-mentioned reinforced steel plate 2 are welded and joined to form a reinforced steel plate assembly 1 for one stage in a square tubular shape separated from the outer peripheral side surface of the pier P1 by a certain distance. assemble. In the present embodiment, since the cross-sectional shape of the pier P1 is rectangular (rectangular), the pier P1 is assembled so as to have a rectangular frame having a similar cross-sectional shape. Of course, when the cross-sectional shape of the pier P1 is circular, oval, or oval, it is assembled so that the cross-sectional shape is similar to the cross-sectional shape. Further, the joining of the end faces of the reinforcing steel plates 2 is not limited to welding joining, and may be mechanically joined such as rivet joining or bolt joining.

(4. Press-fitting process)
As shown in FIGS. 6 and 10, in the method of reinforcing the existing structure according to the present embodiment, the pre-reinforced steel plate is assembled by using the press-fitting device M1 attached to the upper part of the pier P1 in the pre-press-fitting device installation step. A press-fitting process is performed in which the reinforcing steel plate assembly 1 assembled in the process is press-fitted into the ground around the pier P1. At this time, the earth and sand that has invaded the gap G1 between the inner peripheral surface 3a of the reinforcing steel plate assembly main body 3 and the pier P1 is discharged by injecting high-pressure water using a water jet or the like. FIG. 10 is a process explanatory view showing a press-fitting process of the method for reinforcing the existing structure according to the present embodiment.

(Reinforced steel plate assembly → Repeated press fitting)
As shown in FIG. 6, in the method of reinforcing the existing structure according to the present embodiment, the above-mentioned reinforcing steel plate assembling step and press-fitting step are then repeated a plurality of times to complete the reinforcing steel plate assembly 1 and to complete the reinforcing steel plate. Press-fit until the lower end of the assembly 1 reaches a predetermined depth according to the structural design (see FIG. 1).

At this time, in the reinforcing steel plate assembling step, the above-mentioned spacer 4 extending in the vertical direction is attached to the inner peripheral surface 3a of the reinforcing steel plate assembly main body 3 by welding or the like for each predetermined number of steps of the reinforcing steel plate 2. Further, as shown in FIG. 2, a spacer 4a with rollers is joined to the mountain side and the side surface side of the pier P1 to which high earth pressure is applied, and a spacer 4b without rollers is joined to the valley side.

At this time, in the press-fitting step, the roller 5 is brought into contact with the pier P1 and rotated to reduce the pressure of the spacer 4a with rollers pressed against the pier P1 and press-fitted, and the roller 5 is pressed against the pier P1 by the spring material 7. The reinforcing steel plate assembly 1 is press-fitted while following the unevenness of the outer peripheral surface of the pier P1.

By attaching the spacer 4 to the inner peripheral surface 3a of the reinforcing steel plate assembly main body 3 in this way, it is possible to obtain high rigidity that does not buckle against the penetration resistance of the ground when the reinforcing steel plate assembly 1 is press-fitted. be able to. Therefore, in the press-fitting process, it is possible to prevent the reinforcing steel plate assembly 1 from being pressed in the vertical direction and buckling.

Further, in the reinforcing steel plate assembly 1, spacers 4a with rollers, that is, rollers 5 are installed on the mountain side and the side surface side of the pier P1 to which high earth pressure is applied. Therefore, even when press-fitting is performed in a state where unbalanced earth pressure (unbalanced pressure) acts on slope SG or the like, it is possible to reduce the possibility that the spacer 4 interferes with the pier P1 and damages the pier P1.

Further, since the reinforcing steel plate assembly 1 is provided with two types of spacers, a spacer 4a with a roller and a spacer 4b without a roller, the reinforcing steel plate assembly 1 is positioned at an appropriate position even when an unbalanced pressure is applied to the reinforcing steel plate assembly 1 during press fitting. The reinforcing steel plate assembly 1 can be guided and press-fitted.

Further, by rotating and press-fitting the roller 5 of the spacer 4a with a roller at the time of press-fitting, the frictional resistance between the bridge pier P1 and the spacer 4 at the time of press-fitting the reinforcing steel plate assembly 1 is extremely reduced. Therefore, the press-fitting operation in the press-fitting process can be performed smoothly, safely and in a short time.

In addition, the roller 5 of the spacer 4a with a roller is attached via a spring material 7, and stress is concentrated on the convex portion of the outer peripheral side surface of the pier P1 and a part of the rollers 5 due to the unevenness of the outer peripheral side surface of the pier P1. This can be prevented by being dispersed by the spring material 7. Therefore, the press-fitting operation in the press-fitting process can be performed more smoothly, safely and in a short time.

(5. Cleaning process)
As shown in FIG. 6, in the method of reinforcing the existing structure according to the present embodiment, next, a cleaning step of cleaning the gap G1 which is a clearance at the time of press fitting is performed.

Specifically, in this step, the earth and sand and suspended matter adhering to the inner peripheral surface 3a of the reinforcing steel plate assembly main body 3 and the surface of the pier P1 and the gap G1 are washed away by injecting high-pressure water using a water jet or the like. And wash.

(6. Filler filling process)
As shown in FIG. 6, in the method of reinforcing the existing structure according to the present embodiment, a filler filling step of filling the above-mentioned gap G1 (see FIG. 2 and the like) with the above-mentioned filler 6 is then performed.

In this step, the gap G1 that has been cleaned and cleaned in the pre-cleaning step is filled with a filler 6 made of a time-curing material that is cured by a hydration reaction of a cement-based material such as mortar or concrete. The filler 6 to be filled is not limited to the cement-based time-curing material, and may be a filler in which a resin-based adhesive such as an epoxy-based resin is mixed with a filler or the like.

After the filler filling step is completed, the filler 6 is cured after a predetermined curing period in which the curing material (filler 6) is cured over time, and the reinforcing steel plate assembly 1 and the pier P1 are integrated. This completes the method for reinforcing the existing structure according to the present embodiment.

According to the method for reinforcing the reinforcing steel plate assembly and the existing structure according to the present embodiment described above, as illustrated, the reinforcing structure such as the pier P1 is installed on the sloping ground SG or the like, and the biased pressure acts from the outside. Even under the conditions, the reinforcing steel plate assembly 1 can be press-fitted to reinforce the pier P1 without damaging the pier P1 which is a structure. In addition, compared to the conventional reinforcement method, temporary work for securing a work space such as earth retaining is not required, and the workability and economy of the reinforcement work are improved even under difficult conditions where unbalanced pressure acts. ..

Then, according to the method for reinforcing the reinforcing steel plate assembly and the existing structure according to the present embodiment, since the roller 5 is provided between the spacer 4 and the pier P1, the press-fitting resistance is suppressed and the press-fitting of the reinforcing steel plate assembly 1 is performed. Can be performed smoothly, and press-fitting work can be performed safely and in a short time. Further, since the reinforcing steel plate assembly 1 is provided with two types of spacers, a spacer 4a with a roller and a spacer 4b without a roller, the reinforcing steel plate assembly 1 is positioned at an appropriate position even when an unbalanced pressure is applied to the reinforcing steel plate assembly 1 during press fitting. The reinforcing steel plate assembly 1 can be guided and press-fitted.

Further, according to the method for reinforcing the reinforcing steel plate assembly and the existing structure according to the present embodiment, the spring material 7 urges the roller 5 to press against the existing structure to cause unevenness on the outer peripheral surface of the existing structure. Since the press-fitting is performed while following the above, the bias of the external pressure applied to the reinforcing steel plate assembly can be reduced and transmitted to the existing structure. Therefore, not only the risk of damaging the existing structure can be further reduced, but also the press-fitting resistance can be further suppressed, and the press-fitting of the reinforcing steel sheet can be smoothly performed.

The method of reinforcing the existing structure according to the embodiment of the present invention has been described in detail above, but all of the above-mentioned or illustrated embodiments show one embodiment embodied in carrying out the present invention. Not too much. Therefore, the technical scope of the present invention should not be construed in a limited manner by these.

In particular, a case where a reinforcing structure such as a pier P1 is installed on a slope SG and an unbalanced earth pressure acts from the outside has been described as an example. However, the present invention is preferably applied not only when the unbalanced earth pressure acts on the structure but also when there is a bias in either or both of the earth pressure and the water pressure acting from the outside and the unbalanced pressure acts on the structure. Can be applied.

Further, as a structure to be reinforced with a steel plate, a reinforced concrete pier P1 having a rectangular cross-sectional shape has been described as an example, but the cross-sectional shape is not limited to a rectangular one, and the cross-sectional shape is circular, elliptical, or oval. It goes without saying that it can also be applied to things. Further, the structure to be reinforced with the steel plate is not limited to the pier and the concrete structure, and the present invention can be applied as long as it is a columnar structure capable of press-fitting the steel plate to the outside as seismic reinforcement. it can.

1: Reinforcing steel plate assembly 2: Reinforcing steel plate 3: Reinforcing steel plate assembly 3a: Inner peripheral surface 4: Spacer 4a: Spacer with roller 4b: Spacer without roller 41: Strip-shaped steel material 42: Flat steel material 5: Roller 6: Filler 7 : Spring material 8: L-shaped angle (island steel)
M1: Press-fitting device M10: Telescopic jack M11: Pressing jig G1: Gap B1: Existing bridge P1: Pier (structure)
SG: Slope

Claims (4)

A reinforcing steel plate assembly assembled from a plurality of reinforcing steel plates used for seismic reinforcement of a columnar existing structure in which one or both of earth pressure and water pressure acting from the outside are biased.
A reinforcing steel plate assembly main body assembled in a tubular shape in which a plurality of the reinforcing steel plates are joined to form a similar cross-sectional shape separated from the cross-sectional shape of the existing structure by a certain distance.
A plurality of spacers that are projected inward from the inner peripheral surface of the reinforcing steel plate assembly main body and secure a space for filling the filler with the existing structure.
At least one of these plurality of spacers is provided with a roller that is axially supported in the horizontal direction and is rotatable in the vertical direction.
The rollers are provided only on the side where the pressure acting from the outside is high, and there are two types of spacers, a spacer with a roller with a roller attached to the inner end and a spacer without a roller with no roller attached to the inner end. A reinforced steel plate assembly characterized by being provided. The reinforcing steel plate assembly according to claim 1, wherein the roller is attached to the spacer via a spring material. A method for reinforcing an existing structure by installing and reinforcing the reinforcing steel plate assembly according to claim 1 or 2 around a columnar existing structure.
It has a press-fitting process for press-fitting the reinforcing steel sheet assembly.
The press-fitting step is a method for reinforcing an existing structure, which comprises rotating the roller in contact with the existing structure to reduce the pressure at which the spacer is pressed against the existing structure and press-fitting the roller. A method for reinforcing an existing structure by installing and reinforcing the reinforcing steel plate assembly according to claim 2 around the columnar existing structure.
It has a press-fitting process for press-fitting the reinforcing steel sheet assembly.
In the press-fitting step, the roller is brought into contact with the existing structure and rotated to reduce the pressure at which the spacer is pressed against the existing structure, and the roller is press-fitted into the existing structure with the spring material. A method for reinforcing an existing structure, which comprises press-fitting the reinforcing steel plate assembly while urging the existing structure to follow the unevenness of the outer peripheral surface of the existing structure.

Images