Reinforcing steel plate assembly and method for reinforcing existing structure

Abstract

To provide a reinforcing steel plate assembly and a reinforcing method of an existing structure, capable of pressing in a reinforcing steel plate assembly body, without being influenced by sediment.SOLUTION: A reinforcement steel plate assembly assembled from a plurality of reinforcement steel plates used for seismic reinforcement of a columnar existing structure, the reinforcement steel plate assembly comprising: a reinforcement steel plate assembly body in which the plurality of reinforcement steel plates are joined and assembled into a tubular shape having a cross-sectional shape similar to a cross-sectional shape of the existing structure and separated from the cross-sectional shape of the existing structure by a certain distance; The structure includes a plurality of spacers for securing a space to be filled with a filler between the structure and the existing structure, a bearing supported by the spacers in a lateral direction and rotatable in a vertical direction, and a bearing cover provided along a lateral side surface of the bearing.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a reinforced steel plate assembly assembled from a plurality of reinforcing steel plates used for seismic reinforcement of existing columnar structures such as bridge piers, and a method for reinforcing existing structures using the same, and more particularly to a reinforced steel plate assembly with bearing spacers and a method for reinforcing existing structures using the same. [Background technology]

[0002] Conventionally, RC lining and steel plate lining methods have been known as methods for seismic reinforcement of existing RC bridge piers. However, these methods require the installation of earth retaining walls and temporary cofferdams such as steel sheet piles, and the excavation and drainage of the cofferdam to secure work space. As a result, under the severe constraints directly below the existing structure, the steel sheet piles are short and require many joints, which makes construction difficult, lengthy, and expensive.

[0003] In order to solve these problems, Patent Document 1 discloses a reinforced steel plate assembly proposed by the applicant of the present application, which is assembled from multiple reinforcing steel plates and used to seismically reinforce existing columnar structures, and which is characterized by comprising: a reinforced steel plate assembly main body assembled into a cylindrical shape in which the multiple reinforcing steel plates are joined together to form a cross-sectional shape similar to that of the existing structure and spaced a certain distance apart; multiple spacers protruding inward from the inner circumferential surface to ensure space between the assembly and the existing structure for filling with filler material; and a roller supported horizontally on at least one of the multiple spacers and rotatable vertically. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-69845 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the reinforcing steel plate assembly described in Patent Document 1 has a problem in that earth and sand enters the rollers from the side and gets caught between the rollers, preventing the rollers from rotating.

[0006] Therefore, the present invention was devised in consideration of the above-mentioned problems, and its purpose is to provide a reinforcing steel plate assembly and a method for reinforcing an existing structure in which the reinforcing steel plate assembly body can be pressed in without being affected by soil and sand. [Means for solving the problem]

[0007] The reinforcing steel plate assembly of claim 1 is a reinforcing steel plate assembly assembled from a plurality of reinforcing steel plates used for seismic reinforcement of existing columnar structures, and is characterized by comprising: a reinforcing steel plate assembly main body assembled into a cylindrical shape in which a plurality of the reinforcing steel plates are joined together to form a cross-sectional shape similar to that of the existing structure and spaced a certain distance apart; a plurality of spacers protruding inward from the inner surface of the reinforcing steel plate assembly main body to ensure space between the reinforcing steel plate assembly main body and the existing structure for filling with filler material; bearings journaled laterally by the spacers and rotatable vertically; and bearing covers provided along the lateral sides of the bearings.

[0008] The reinforced steel plate assembly of claim 2 is the reinforced steel plate assembly of claim 1, characterized in that the number of spacers provided per area of ​​the inner surface of the reinforced steel plate assembly body increases depending on either or both of the earth pressure and water pressure acting from the outside.

[0009] The reinforcing steel plate assembly of claim 3 is the reinforcing steel plate assembly of claim 1, characterized in that the number of spacers provided per area of ​​the inner surface of the reinforcing steel plate assembly body increases downward.

[0010] A method for reinforcing an existing structure according to a fourth aspect of the present invention is characterized in that the spacer has a cross-sectional shape perpendicular to the lateral direction that is tapered so that the width decreases downward.

[0011] The method for reinforcing an existing structure according to claim 5 is a method for reinforcing an existing structure by installing the reinforcing steel plate assembly according to any one of claims 1 to 4 around an existing columnar structure, and is characterized by including a press-in step of abutting the bearing against the existing structure and rotating it to press-in the reinforcing steel plate assembly. [Effects of the Invention]

[0012] According to the inventions of claims 1 to 5, the reinforcing steel plate assembly includes a bearing cover provided along the side surface of the bearing, which makes it possible to prevent soil and sand from entering from the side surface of the bearing, and therefore the reinforcing steel plate assembly body can be press-fitted without being affected by soil and sand.

[0013] In particular, according to the invention of claim 2, the number of spacers provided per area of ​​the inner circumferential surface of the reinforced steel plate assembly body increases depending on either or both of the earth pressure and water pressure acting from the outside. Therefore, by providing an appropriate number of bearings in appropriate locations, unnecessary bearings can be eliminated, thereby reducing the manufacturing cost of the reinforced steel plate assembly.

[0014] In particular, according to the invention of claim 3, the number of spacers provided per area of ​​the inner peripheral surface of the reinforced steel plate assembly body increases downward. Therefore, since more bearings are provided downward where the pressure acting from the outside is higher, unnecessary bearings can be eliminated, and the manufacturing cost of the reinforced steel plate assembly can be further reduced.

[0015] In particular, according to the invention of claim 4, the spacer has a tapered cross section perpendicular to the horizontal direction, the width of which decreases downward. This makes it possible to reduce the resistance to the earth and sand being pressed in by grading the area of ​​contact with the spacer in the pressing-in direction during pressing-in, and reduces the burden on the spacer, allowing the reinforcing steel plate to be pressed in more safely.

[0016] In particular, according to claim 5, the method for reinforcing an existing structure includes a press-fitting step of rotating a bearing in contact with the existing structure and press-fitting the reinforcing steel plate assembly. This allows the bearing to conform to the irregularities of the outer peripheral surface of the existing structure when it comes into contact with the existing structure during press-fitting, thereby reducing the bias of the external pressure applied to the reinforcing steel plate assembly and transmitting it to the existing structure. This not only further reduces the risk of damage to the existing structure, but also further reduces press-fitting resistance, allowing the reinforcing steel plates to be smoothly press-fitted while maintaining a predetermined distance. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a side view showing a bridge pier reinforced with a reinforcing steel plate assembly according to an embodiment of the present invention. [Figure 2] FIG. 2 is a view showing a part of a cross section perpendicular to the press-fitting direction of the reinforcing steel plate assembly according to the embodiment of the present invention. [Figure 3] FIG. 3 is a view showing the inner peripheral surface of the reinforcing steel plate assembly according to the embodiment of the present invention. [Figure 4] Fig. 4 is an enlarged view of part A in Fig. 2. Fig. 4(a) is a top view of a spacer according to an embodiment of the present invention. Fig. 4(b) is a left side view of a spacer according to an embodiment of the present invention. Fig. 4(c) is a right side view of a spacer according to an embodiment of the present invention. Fig. 4(d) is a front view of a spacer according to an embodiment of the present invention. [Figure 5] Fig. 5(a) is a perspective view showing the configuration of a spacer according to an embodiment of the present invention, and Fig. 5(b) is a perspective view showing a welding surface of the spacer according to an embodiment of the present invention. [Figure 6] Fig. 6(a) is a perspective view of a bearing according to an embodiment of the present invention, and Fig. 6(b) is a plan view showing the interior of the bearing according to an embodiment of the present invention. [Figure 7] FIG. 7 is a flowchart showing the steps of the method for reinforcing an existing structure according to this embodiment. [Figure 8] FIG. 8 is a process explanatory diagram showing the reaction steel plate installation process of the method for reinforcing an existing structure according to this embodiment. [Figure 9] FIG. 9 is a process explanatory diagram showing the press-fitting device installation process of the method for reinforcing an existing structure according to this embodiment. [Figure 10] FIG. 10 is a process explanatory diagram showing the reinforcing steel plate assembling process of the method for reinforcing an existing structure according to this embodiment. [Figure 11] FIG. 11 is a process explanatory diagram showing the press-fitting process of the method for reinforcing an existing structure according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of a reinforcing steel plate assembly and a method for reinforcing an existing structure according to the present invention will be described in detail with reference to the drawings.

[0019] [Reinforced steel plate assembly] First, a reinforced steel plate assembly according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6. In this embodiment, a reinforced concrete pier P1 of an existing bridge B1 will be described as an example of an existing structure to be seismically reinforced. FIG. 1 is a side view showing a pier reinforced with a reinforced steel plate assembly 1 according to an embodiment of the present invention. FIG. 2 is a diagram showing a portion of a cross section perpendicular to the press-fit direction z of the reinforced steel plate assembly 1 according to an embodiment of the present invention. FIG. 3 is a diagram showing an inner peripheral surface 3a of the reinforced steel plate assembly 1 according to an embodiment of the present invention. As shown in FIG. 1, the pier P1 is installed on a slope SG, and an external pressure acts on the side of the pier P1, with the soil pressure on the mountain side being higher than the soil pressure on the valley side. Furthermore, an external pressure acting on the side of the pier P1 is an earth pressure that is higher in the press-fit direction z.

[0020] 1 and 2, the reinforced steel plate assembly 1 according to this embodiment is composed of a reinforced steel plate assembly main body 3 to which a plurality of reinforced steel plates 2 are joined, a plurality of spacers 4 and stiffeners 7 protruding inward from the inner peripheral surface of the reinforced steel plate assembly main body 3, and a bearing 5 that is journaled on the plurality of spacers 4 and is rotatable in the vertical direction. As shown in Fig. 2, the gap between the reinforced 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-hardening material that hardens by a hydration reaction, and the filler 6 hardens, thereby integrating the reinforced steel plate assembly 1 and the pier P1.

[0021] (reinforced steel plate) The reinforcing steel plate 2 is a rectangular (oblong) steel plate with a predetermined thickness (9 mm in the illustrated embodiment) according to the structural design. Of course, 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.

[0022] (Reinforced steel plate assembly body) The reinforcing steel plate assembly body 3 is assembled into a cylindrical shape with a cross-sectional shape similar to that of the pier P1, spaced a certain distance from the outer peripheral side surface of the pier P1, by welding the end faces of multiple reinforcing steel plates 2 together. In this embodiment, the reinforcing steel plates 2 are welded together, but they may also be joined mechanically by rivets, bolts, or the like.

[0023] Furthermore, the pier P1 has, for example, a rectangular (oblong) horizontal cross section, and the horizontal cross section of the reinforcing steel plate assembly main body 3 also has a rectangular (oblong) shape. A gap G1 is formed 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, with the gap G1 being filled with a filler material 6.

[0024] (stiffener) As shown in Figure 3, the stiffener 7 is a member that protrudes inward from the inner peripheral surface 3a of the reinforcing steel plate assembly main body 3 toward the pier P1 side. The stiffener 7 is a vertically extending strip-shaped member that is suspended inward from the inner peripheral surface 3a of the reinforcing steel plate assembly main body 3 toward the pier P1 side. The stiffener 7 has the function of improving the strength of the reinforcing steel plate assembly main body 3.

[0025] (spacer) The spacer 4 is made of a predetermined steel material according to the required strength, such as buckling prevention function, and is a member that protrudes inward toward the pier P1 side from the inner peripheral surface 3a of the reinforcing steel plate assembly body 3. This spacer 4 has the function of securing a space between the inner peripheral surface 3a and the pier P1 to fill with the filler material 6, and the function of preventing the reinforcing steel plate 2 from buckling when the reinforcing steel plate assembly 1 is pressed in.

[0026] The spacers 4 are provided so that the number per unit area of ​​the inner peripheral surface 3a increases depending on either or both of the external earth pressure and water pressure. The spacers 4 may be provided on the inner peripheral surface 3a of the reinforced steel plate assembly main body 3 so that the number is greater on the mountain side and its side of the pier P1, where higher earth pressure is applied by the slope SG, than on the valley side, where the earth pressure is relatively light. As shown in FIG. 3, the spacers 4 may be provided so that the number per unit area of ​​the inner peripheral surface 3a increases in the press-fitting direction z. The spacers 4 may be provided at any position and in any number. The spacers 4 may have any shape depending on the installation position.

[0027] As shown in FIG. 2, the spacer 4 is provided so that the gap b between the stiffener 7 and the pier P1 is larger than the gap a between the spacer 4 and the pier P1.

[0028] Fig. 4 is an enlarged view of part A in Fig. 2. Fig. 4(a) is a top view of a spacer 4 according to an embodiment of the present invention. Fig. 4(b) is a left side view of a spacer 4 according to an embodiment of the present invention. Fig. 4(c) is a right side view of a spacer 4 according to an embodiment of the present invention. Fig. 4(d) is a front view of a spacer 4 according to an embodiment of the present invention. Fig. 5(a) is a perspective view showing a configuration of a spacer 4 according to an embodiment of the present invention. Fig. 5(b) is a perspective view showing a welding surface 41b of a spacer 4 according to an embodiment of the present invention.

[0029] The spacer 4 includes an L-shaped angle 41 attached to the inner circumferential surface 3a of the reinforced steel plate assembly main body 3, and a bearing 5 attached to the L-shaped angle 41 via a bolt 42, a nut 43, and a washer 44. The bolts 42, nuts 43, and washers 44 used in the spacer 4 may be different from each other depending on the attachment position on the inner circumferential surface 3a of the reinforced steel plate assembly main body 3. The bolts 42, nuts 43, and washers 44 may be different from each other so that their diameters increase toward the press-fit direction z of the inner circumferential surface 3a of the reinforced steel plate assembly main body 3, for example.

[0030] (L-shaped angle) The L-shaped angle 41 has a welding surface 41b attached to the inner circumferential surface 3a of the reinforced steel plate assembly main body 3, and an attachment surface 41a bent into an L shape from the end of the welding surface 41b. The L-shaped angle 41 may be attached by welding the outer periphery of the welding surface 41b to the inner circumferential surface 3a of the reinforced steel plate assembly main body 3. Furthermore, L-shaped angles 41 of different thicknesses may be used depending on the position at which they are attached to the inner circumferential surface 3a of the reinforced steel plate assembly main body 3. L-shaped angles 41 of different thicknesses may be used so that they become thicker, for example, toward the press-fit direction z of the inner circumferential surface 3a of the reinforced steel plate assembly main body 3.

[0031] The mounting surface 41a is formed in a tapered shape such that the lower part of the cross section perpendicular to the lateral direction x tapers downward in the press-fitting direction z, with the width in the vertical direction y becoming smaller.

[0032] (bearing) The bearing 5 is attached to the mounting surface 41a of the L-shaped angle 41 via a bolt 42, a nut 43, and a washer 44, and is journaled in the horizontal direction x. The bearing 5 is vertically rotatable in the press-fitting direction z, and is configured to significantly reduce frictional resistance between the spacer 4 and the pier P1 when the reinforced steel plate assembly 1 is press-fitted. Different bearings 5 ​​may be used depending on the position at which they are attached to the inner circumferential surface 3a of the reinforced steel plate assembly main body 3. For example, bearings 5 ​​with different model numbers may be used along the press-fitting direction z of the inner circumferential surface 3a of the reinforced steel plate assembly main body 3 to improve durability.

[0033] FIG. 6(a) is a perspective view of a bearing 5 according to an embodiment of the present invention. FIG. 6(b) is a view showing the interior of the bearing 5 according to an embodiment of the present invention. The bearing 5 includes an inner ring 54 fixed to the bolts 42, rolling elements 53 provided on the outside of the inner ring 54, an outer ring 52 provided on the outside of the rolling elements 53, and bearing covers 51 provided along both side surfaces in the lateral direction x. In the bearing 5, the rolling elements 53 sandwiched between the inner ring 54 fixed to the bolts 42 and the rotatable outer ring 52 roll in the rotational direction, causing the outer ring 52 to rotate. The bearing 5 has bearing covers 51 provided on both side surfaces, making it possible to prevent soil and sand from entering through the side surfaces of the bearing 5. This allows the reinforced steel plate assembly main body 3 to be press-fitted without being affected by soil and sand.

[0034] [Methods for reinforcing existing structures] Next, a method for reinforcing an existing structure according to an embodiment of the present invention will be described with reference to FIGS. 7 to 11. An example will be described in which the reinforcing steel plate assembly 1 described above is installed around a reinforced concrete pier P1 of an existing bridge B1 constructed on the aforementioned sloping ground SG to reinforce the existing bridge B1. FIG. 7 is a flowchart showing each step of the method for reinforcing an existing structure according to this embodiment, and FIG. 8 is a process explanatory diagram showing the reaction steel plate installation process of the method for reinforcing an existing structure according to this embodiment. FIG. 9 is a process explanatory diagram showing the press-fit device installation process of the method for reinforcing an existing structure according to this embodiment. FIG. 10 is a process explanatory diagram showing the reinforcing steel plate assembly process of the method for reinforcing an existing structure according to this embodiment. FIG. 11 is a process explanatory diagram showing the press-fit process of the method for reinforcing an existing structure according to this embodiment.

[0035] (1. Reaction steel plate installation process) As shown in FIGS. 7 and 8, in the method for reinforcing an existing structure according to this embodiment, first, a reaction steel plate installation step is carried out in which a reaction steel plate S1 is installed on a bridge pier P1, which is an existing structure.

[0036] Specifically, in this process, a post-installed anchor is installed on the top of the pier P1, and then the reaction steel plate S1 is fixed and installed by bolting it to the post-installed anchor.

[0037] (2. Press-fit device installation process) 7 and 9, the method for reinforcing an existing structure according to this embodiment next involves a press-in device installation step in which a press-in device M1 is attached to and installed on the reaction steel plate S1 installed in the previous step. Fig. 9 is a process explanatory diagram showing the press-in device installation step of the method for reinforcing an existing structure according to this embodiment.

[0038] Specifically, in this process, the press-in device M1 is supported and fixed to the top of the pier P1 by bolting to the reaction steel plate S1. Of course, the method of supporting and fixing the press-in device M1 to the pier P1 is not limited to bolting, and any method of fixing may be used.

[0039] This press-fitting device M1 is a hydraulically driven linear motion mechanism, and is composed of a plurality of telescopic jacks M10 that press-fit the aforementioned reinforcing steel plate assembly 1, and a pressing jig M11 made of steel that transmits the pressure of these telescopic jacks M10 evenly to the reinforcing steel plate assembly 1.

[0040] (3. Reinforced steel plate assembly process) 7 and 10, the method for reinforcing an existing structure according to this embodiment next involves a reinforcing steel plate assembling process for assembling one stage of reinforcing steel plate assemblies 1 on a sloping ground SG. Fig. 10 is a process explanatory diagram showing the reinforcing steel plate assembling process in the method for reinforcing an existing structure according to this embodiment.

[0041] Specifically, in this process, the left and right end faces of the reinforcing steel plates 2 are welded together to assemble one stage of reinforcing steel plate assemblies 1 into a rectangular tube-like shape spaced a certain distance from the outer peripheral side face of the pier P1. In this embodiment, since the cross-sectional shape of the pier P1 is rectangular (rectangular), the reinforcing steel plate assemblies 1 are assembled to form a rectangular frame with a similar cross-sectional shape. Of course, if the cross-sectional shape of the pier P1 is circular, elliptical, or oval, the reinforcing steel plates 2 are assembled to form a cross-sectional shape similar to that cross-sectional shape. Furthermore, the joining of the end faces of the reinforcing steel plates 2 is not limited to welding, and they may also be joined mechanically by rivets, bolts, or the like.

[0042] (4. Press-fit process) As shown in Figures 7 and 11, the method for reinforcing an existing structure according to this embodiment next involves a press-in process, in which the reinforcing steel plate assembly 1 assembled in the pre-reinforcing steel plate assembly process is pressed into the ground around the pier P1 using a press-in device M1 attached to the top of the pier P1 in the pre-press-in device installation process. At this time, soil and sand that has infiltrated into the gap G1 between the inner peripheral surface 3a of the reinforcing steel plate assembly body 3 and the pier P1 is removed by spraying high-pressure water using a water jet or the like. Figure 11 is a process explanatory diagram showing the press-in process of the method for reinforcing an existing structure according to this embodiment.

[0043] (Repeated assembly of reinforcing steel plates and press-fitting) As shown in Figure 7, in the method for reinforcing an existing structure according to this embodiment, the aforementioned reinforcing steel plate assembly process and press-in process are then repeated multiple times to complete the reinforcing steel plate assembly 1, and the lower end of the reinforcing steel plate assembly 1 is pressed in until it reaches a predetermined depth according to the structural design (see Figure 1).

[0044] 3, the spacers 4 may be provided so that the number per unit area of ​​the inner peripheral surface 3a is increased depending on either or both of the external earth pressure and water pressure. For example, the spacers 4 may be provided on the inner peripheral surface 3a of the reinforced steel plate assembly main body 3 so that the number is greater on the mountain side and its side of the pier P1, which is subjected to higher earth pressure due to the slope SG, than on the valley side, where the earth pressure is relatively light. Also, as shown in FIG. 3, the spacers 4 may be provided so that the number per unit area of ​​the inner peripheral surface 3a is increased in the press-fitting direction z. Any number of spacers 4 may be provided at any position.

[0045] At this time, in the press-in process, the bearing 5 is abutted against the pier P1 and rotated, reducing the pressure with which the spacer 4 is pressed against the pier P1, and the reinforcing steel plate assembly 1 is pressed in while following the unevenness of the outer surface of the pier P1.

[0046] In this way, by attaching the spacer 4 to the inner peripheral surface 3a of the reinforced steel plate assembly main body 3, it is possible to ensure the necessary distance between the reinforced steel plate assembly main body 3 and the pier P1. Furthermore, by attaching the spacer 4 to the inner peripheral surface 3a of the reinforced steel plate assembly main body 3, when the spacer 4 comes into contact with the pier P1, it is possible to reduce the resistance at the time of contact, frictional resistance, and press-fit resistance.

[0047] Furthermore, the reinforcing steel plate assembly 1 is provided with a large number of spacers 4 per area of ​​the inner peripheral surface 3a in response to either or both of the external earth pressure and water pressure. Therefore, even when press-in is performed on a slope SG and in a state where uneven earth pressure (biased pressure) is acting due to the depth in the press-in direction z, the risk of the spacers 4 interfering with the pier P1 and damaging the pier P1 can be reduced.

[0048] (5. Cleaning process) As shown in FIG. 7, in the reinforcing method for an existing structure according to this embodiment, a cleaning step is then carried out to clean the gap G1, which is the clearance at the time of press-fitting.

[0049] Specifically, in this process, soil and floating matter adhering to the inner surface 3a of the reinforcing steel plate assembly main body 3, the surface of the pier P1, and the gap G1 are washed away and cleaned by spraying high-pressure water using a water jet or the like.

[0050] (6. Filler filling process) As shown in FIG. 7, in the reinforcing method for an existing structure according to this embodiment, a filler filling step is next carried out in which the filler 6 is filled into the gap G1 (see FIG. 2, etc.).

[0051] In this process, the gap G1 that has been cleaned in the pre-cleaning process is filled with a filler 6 made of a cement-based time-hardening material that hardens through a hydration reaction, such as mortar or concrete. Note that the filler 6 to be filled is not limited to a cement-based time-hardening material, and it can also be a filler made by mixing a filler or the like with a resin-based adhesive, such as an epoxy resin.

[0052] After the filler filling step is completed, a predetermined curing period is allowed for the time-hardening material (filler 6) to harden, and the reinforcing steel plate assembly 1 and the pier P1 are integrated together. This completes the method for reinforcing an existing structure according to this embodiment.

[0053] According to the reinforcing steel plate assembly and reinforcing method for an existing structure according to the present embodiment described above, as exemplified, a structure to be reinforced, such as a pier P1, is installed on sloping ground SG, etc., and even under conditions of external biased pressure, the reinforcing steel plate assembly 1 can be pressed in to reinforce the pier P1 without damaging the pier P1, which is the structure. Furthermore, compared to conventional reinforcement methods, temporary construction work to ensure working space, such as retaining earth, is not required, improving the ease of construction and economic efficiency of reinforcement work even under difficult conditions of biased pressure.

[0054] Furthermore, according to the reinforcing steel plate assembly and the method for reinforcing an existing structure of this embodiment, a bearing 5 is provided between the spacer 4 and the pier P1, which reduces press-in resistance and allows the reinforcing steel plate assembly 1 to be pressed in smoothly, allowing the press-in work to be carried out safely and in a short time.

[0055] Although the method for reinforcing an existing structure according to the embodiment of the present invention has been described in detail above, the above-described and illustrated embodiments are merely specific examples for carrying out the present invention, and therefore the technical scope of the present invention should not be interpreted as being limited by them.

[0056] In particular, the case where a reinforcing structure such as a bridge pier P1 is installed on a sloping ground SG and is subjected to external earth pressure has been described as an example. However, this invention is not limited to cases where an external earth pressure acts on a structure, and can also be suitably applied to cases where there is an imbalance in either or both of the external earth pressure and water pressure, causing the external pressure to act on the structure.

[0057] Furthermore, although a reinforced concrete bridge pier P1 with a rectangular cross section has been described as an example of a structure to be reinforced with steel plates, it goes without saying that the present invention is not limited to structures with a rectangular cross section, but can also be applied to structures with a circular, elliptical, or oval cross section. Furthermore, structures to be reinforced with steel plates are not limited to bridge piers or concrete structures, and the present invention can be applied to any columnar structure that can be reinforced by press-fitting steel plates onto the outside for seismic reinforcement. [Explanation of symbols]

[0058] 1: Reinforced steel plate assembly 2: Reinforced steel plate 3: Reinforced steel plate assembly 3a: Inner surface 4: Spacer 5: Bearings 6: Filling material 7: Stiffener 41: L-shaped angle 41a: Mounting surface 41b: Welding surface 42: Bolt 43: Nut 44: Washer 51: Bearing cover 52: Outer ring 53: Rolling element 54: Insider M1: Press-fit device M10: Telescopic jack M11: Pressing jig G1: Gap B1: Existing bridge P1: Pier (structure) SG: Slope

Claims

1. A reinforcing steel plate assembly assembled from a plurality of reinforcing steel plates used for seismic reinforcement of an existing columnar structure, a reinforcing steel plate assembly body in which a plurality of the reinforcing steel plates are joined together to form a cylindrical assembly having a cross-sectional shape similar to the cross-sectional shape of the existing structure and spaced a certain distance apart; a plurality of spacers that protrude inward from the inner circumferential surface of the reinforcing steel plate assembly body and that secure a space between the reinforcing steel plate assembly body and the existing structure into which a filler material is to be filled; a bearing supported laterally by the spacer and rotatable up and down; a bearing cover provided along the lateral side of the bearing. A reinforced steel plate assembly comprising:

2. The number of spacers provided per area of ​​the inner circumferential surface of the reinforcing steel plate assembly body increases in response to either or both of earth pressure and water pressure acting from the outside.

2. The reinforcing steel plate assembly according to claim 1,

3. The number of the spacers provided per unit area of ​​the inner circumferential surface of the reinforcing steel plate assembly body increases downward.

2. The reinforcing steel plate assembly according to claim 1,

4. The spacer has a cross-sectional shape perpendicular to the lateral direction that tapers downward in width.

2. The reinforcing steel plate assembly according to claim 1,

5. A method for reinforcing an existing structure by installing the reinforcing steel plate assembly according to any one of claims 1 to 4 around an existing columnar structure, a press-fitting step of rotating the bearing in contact with the existing structure and press-fitting the reinforcing steel plate assembly; A method for reinforcing an existing structure, characterized by:

Images