Strengthening Steel Structure of Reinforced Concrete Buildings

Abstract

The present invention relates to a seismic reinforcement structure for a building that can improve the seismic performance of a building by elastically connecting a column and a beam installed in the building to mitigate vibrations generated at the connection point between the column and the beam. The characteristic configuration thereof comprises: a column coupling plate installed on the front of the column in a plate shape, wherein a plurality of coupling holes are formed in the portion corresponding to the column and a plurality of first guide holes are formed at regular intervals along the longitudinal direction in the center portion of the front; a beam coupling plate installed on the front of the beam in a plate shape, wherein a plurality of fastening holes are formed in the portion corresponding to the beam and a plurality of second guide holes are formed at regular intervals along the longitudinal direction in the center portion of the front; a support bracket having a plurality of fixing plates provided on the rear side with connecting holes corresponding to the first guide holes, a plurality of first elastic plates provided on the rear side adjacent to the fixing plates, and a pair of spaced-apart fixing rings provided on the front side, which is coupled to the front of the column coupling plate so as to adjust its position through a bolt coupled to the connecting hole; and The device comprises a connecting bracket having a plurality of connecting plates formed with insertion holes corresponding to second guide holes on an upper surface, a plurality of second elastic plates on an upper surface adjacent to the connecting plates, and a pair of spaced connecting rings on a lower surface, which is connected to the front surface of the beam connecting plate so as to be adjacent to the support bracket through a bolt connected to the insertion holes, and an elastic spring installed such that at least one of them is connected to the fixing ring and the connecting ring.

Description

Technology Field

[0001] The present invention relates to a seismic reinforcement structure for buildings, and more specifically, to a seismic reinforcement structure for buildings that can improve the seismic performance of a building by elastically connecting a column and a beam installed in a building to mitigate vibrations occurring at the connection point between the column and the beam. Background Technology

[0003] Many buildings are constructed and provided to enable people to live in complex residential spaces or lead various daily lives, and such buildings are typically constructed using reinforced concrete.

[0004] Such buildings are constructed above ground, and during the construction process, structures made of reinforced steel are firmly connected, after which the building is solidly constructed above ground through a concrete pouring process using formwork.

[0005] At this time, during the construction process, multiple structures consisting of columns and beams are installed to prevent the building from shaking due to external impacts and to maintain a sturdy state, and such columns and beams are made of sturdy metal materials.

[0006] Furthermore, in recent years, seismic design structures have become essential to prevent damage to buildings caused by earthquakes occurring on the ground; consequently, buildings are being constructed with seismic reinforcement structures applied to components such as the connections between columns and beams and the walls to enhance seismic performance.

[0007] For example, in the past, a seismic reinforcement structure method capable of reinforcing the connection between the columns and beams of a building was proposed, as described in literature (1).

[0008] However, conventional seismic reinforcement structures such as the one described in document (1) had a problem in that it was difficult to use them by adjusting the installation location of the reinforcement structure connected to the column and beam according to the connection state of the column and beam, and even when installed on the column and beam, it was difficult to increase seismic reinforcement efficiency by firmly connecting the connection part of the column and beam. Prior art literature

[0010] (1) Republic of Korea registered patent No. 10-1862038 (May 23, 2018) The problem to be solved

[0011] The present invention has been devised to solve the aforementioned problems, and the objectives of the present invention are as follows.

[0012] First, even when installed on the columns and beams of a building, it is designed to flexibly adapt to the shape of the connection points between the columns and beams, ensuring stable installation and use.

[0013] Second, it can be installed and used to connect the columns and beams of a building without complex configuration, and once installed, it ensures that the installed position is firmly maintained for use.

[0014] Third, the support bracket installed on the column and the connecting bracket installed on the beam are maintained in a firmly connected state through the composition of elastic springs, support springs, and elastic wires, thereby enabling seismic reinforcement of the building.

[0015] Fourth, the support bracket installed on the column and the connecting bracket installed on the beam are configured to be connected by an installation bracket, thereby firmly supporting the connection between the column and the beam of the building and enabling seismic reinforcement of the building. means of solving the problem

[0017] To achieve the above objective, the present invention relates to a seismic reinforcement structure connected to a column and a beam of a building, comprising: a column coupling plate installed on the front of the column, wherein a plurality of coupling holes are formed in the portion corresponding to the column and a plurality of first guide holes are formed at regular intervals along the length direction in the center portion of the front; a beam coupling plate installed on the front of the beam, wherein a plurality of fastening holes are formed in the portion corresponding to the beam and a plurality of second guide holes are formed at regular intervals along the length direction in the center portion of the front; a support bracket having a plurality of fixing plates provided on the rear surface with connecting holes corresponding to the first guide holes, a plurality of first elastic plates provided on the rear surface adjacent to the fixing plates, and a pair of spaced-apart fixing hooks provided on the front surface so as to be coupled to the front of the column coupling plate so as to be position-adjustable through a bolt coupled to the connecting holes; and a plurality of connecting plates provided on the upper surface with insertion holes corresponding to the second guide holes, a plurality of second elastic plates provided on the upper surface adjacent to the connecting plates, and a pair of connecting hooks on the lower surface It may be configured to include a connecting bracket that is spaced apart and coupled to the front surface of the beam coupling plate so as to be positioned adjacent to the supporting bracket through a bolt coupled to the insertion hole, and an elastic spring installed to be connected to at least one of the fixing ring and the connecting ring.

[0018] At this time, the support bracket may be further provided with a first support bracket having an elongated first support hole on the front surface adjacent to the beam, and the connecting bracket may be further provided with a second support bracket having an elongated second support hole on the lower surface adjacent to the column, and the first support bracket and the second support bracket may be configured such that when the support bracket and the connecting bracket are installed, a bolt inserted into the first support hole is coupled to the second support hole to firmly maintain the installation position of the support bracket and the connecting bracket.

[0019] Additionally, the support bracket may further have a first mounting hole formed on the front surface adjacent to the end facing the first support bracket, and the connecting bracket may further have a second mounting hole formed on the lower surface adjacent to the end facing the second support bracket, and an installation bracket may further be installed in the first mounting hole and the second mounting hole, wherein the installation bracket includes a first installation plate equipped with a first installation hole corresponding to the first mounting hole, a second installation plate equipped with a second installation hole corresponding to the second mounting hole, and a third installation plate connecting the first installation plate and the second installation plate, wherein a protruding bracket protruding from the upper surface, with a catch hole formed at both ends in the longitudinal direction, may be provided, and when the installation bracket is installed in the first mounting hole and the second mounting hole, a support spring may be configured to be connected to the fixing ring and the catch hole and the connecting ring and the catch hole.

[0020] Additionally, a first fastening plate with a first through hole formed at both ends in the longitudinal direction is provided protruding between the fixed rings, and a second fastening plate with a second through hole formed at both ends in the longitudinal direction is provided protruding between the connecting rings, and the fixed rings and the first through hole, the connecting rings and the second through hole, and the first through hole and the second through hole can be configured to be connected by an elastic wire. Effects of the invention

[0022] The present invention as described above can achieve the following effects.

[0023] First, even when installed on the columns and beams of a building, it flexibly adapts to the shape of the connection points between the columns and beams, enabling stable installation and use.

[0024] Second, it can be installed and used to connect the columns and beams of a building without a complex configuration, and once installed, it can be used while maintaining the installed position firmly.

[0025] Third, seismic reinforcement of the building can be achieved by maintaining a firmly connected state between the support bracket installed on the column and the connecting bracket installed on the beam through the composition of elastic springs, support springs, and elastic wires.

[0026] Fourth, the support bracket installed on the column and the connecting bracket installed on the beam are configured to be connected by the installation bracket, thereby firmly supporting the connection between the column and the beam of the building and enabling seismic reinforcement of the building. Brief explanation of the drawing

[0028] FIG. 1 is a cross-sectional view illustrating the state in which the seismic reinforcement structure for a building according to the present invention is installed at the connection point between a column and a beam. FIG. 2 is another cross-sectional view illustrating the state in which the seismic reinforcement structure for a building according to the present invention is installed at the connection point between a column and a beam. FIG. 3 is another cross-sectional view illustrating the state in which the seismic reinforcement structure for a building according to the present invention is installed at the connection point between a column and a beam. FIG. 4 is another cross-sectional view illustrating the state in which the seismic reinforcement structure for a building according to the present invention is installed at the connection point between a column and a beam. FIG. 5 is a cross-sectional view illustrating the state in which the seismic reinforcement structure for a building according to the present invention is installed at the connection point between a column and a beam. FIG. 6 is another cross-sectional view illustrating the state in which the seismic reinforcement structure for a building according to the present invention is installed at the connection point between a column and a beam. Specific details for implementing the invention

[0029] Terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but rather should be interpreted in a sense and concept consistent with the technical spirit of the invention, based on the principle that "the inventor may appropriately define the concept of a term to best describe his invention."

[0030] In addition, the embodiments described in this specification and the configurations illustrated in the drawings are merely preferred embodiments of the present invention and do not represent all technical concepts of the present invention; therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0031] In addition, regarding the description of the support bracket, the part where the connection is made from the direction of the column to the direction of the support bracket will be referred to as the front side, and regarding the description of the connecting bracket, the part where the connection is made from the direction of the beam to the direction of the connecting bracket will be referred to as the bottom side.

[0032] Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings.

[0033] As shown in FIGS. 1 to 6, the present invention relates to a seismic reinforcement structure connected to a column (1) and a beam (2) of a building, comprising: a column coupling plate (10) installed on the front of the column (1) in a plate shape, wherein a plurality of coupling holes (11) are formed in a portion corresponding to the column (1) and a plurality of first guide holes (12) are formed at regular intervals along the length direction in a portion of the front center; a beam coupling plate (20) installed on the front of the beam (2) in a plate shape, wherein a plurality of fastening holes (21) are formed in a portion corresponding to the beam (2) and a plurality of second guide holes (22) are formed at regular intervals along the length direction in a portion of the front center; a plurality of fixing plates (31) having connecting holes (31a) corresponding to the first guide holes (12) are provided on the rear, a plurality of first elastic plates (32) are provided on the rear adjacent to the fixing plates (31), and a pair of fixing rings (33) are provided spaced apart on the front. The structure comprises a support bracket (30) that is positionally adjustable and coupled to the front surface of the column coupling plate (10) through a bolt (P) coupled to the connecting hole (31a), a plurality of connecting plates (41) having an insertion hole (41a) corresponding to the second guide hole (22) formed on the upper surface, a plurality of second elastic plates (42) provided on the upper surface adjacent to the connecting plates (41), and a pair of connecting rings (43) spaced apart on the lower surface, and a connecting bracket (40) that is positionally adjustable and coupled to the front surface of the beam coupling plate (20) adjacent to the support bracket (30) through a bolt (P) coupled to the insertion hole (41a), and an elastic spring (47) installed to be connected to at least one of the fixing ring (33) and the connecting ring (43).

[0034] The above column connecting plate (10) is configured in a plate shape that is fixedly installed on the front surface of the column (1), and is fixedly installed on the front surface of the column (1) through a bolt (P) connected to the connecting hole (11).

[0035] In addition, the column connecting plate (10) is configured such that a plurality of first guide holes (12) are formed at regular intervals along the length direction, and the fixing plate (31) of the support bracket (30), which will be described in detail below, can be connected to the first guide holes (12).

[0036] Additionally, the beam connecting plate (20) is configured in a plate shape that is fixedly installed on the front surface of the beam (2) connected to the column (1), and is fixedly installed on the front surface of the beam (2) through a bolt (P) connected to the fastening hole (21).

[0037] At this time, the above-mentioned connecting plate (20) is configured such that a plurality of second guide holes (22) are formed at regular intervals along the length direction, and the connecting plate (41) of the connecting bracket (40), which will be described in detail below, can be connected to the second guide holes (22).

[0038] The above configuration is configured such that the column connecting plate (10) and the beam connecting plate (20) are respectively connected at the connection point between the column (1) and the beam (2) of the building, and the user sets the location where the support bracket (30) and the connecting bracket (40) are to be installed in advance, thereby connecting the column connecting plate (10) and the beam connecting plate (20) so that the installation of the support bracket (30) and the connecting bracket (40) can be easily achieved.

[0039] In addition, as shown in FIGS. 1 to 6, the support bracket (30) is configured such that a plurality of fixing plates (31) are provided on the rear side, each having a connecting hole (31a) formed therein that corresponds to the first guide hole (12) of the column coupling plate (10), and a bolt (P) coupled to the connecting hole (31a) is coupled to the first guide hole (12), thereby allowing the support bracket (30) to be installed on the column coupling plate (10).

[0040] In addition, the support bracket (30) is provided with a plurality of first elastic plates (32) on the rear side adjacent to the fixing plate (31), so that even when the fixing plate (31) is connected to the first guide hole (12), the rear side of the support bracket (30) is not excessively pressed against one side of the column (1) and damage is prevented, and stable installation can be achieved, and a pair of fixing rings (33) are provided spaced apart on the front side.

[0041] And the above connecting bracket (40) is installed on the beam connecting plate (20) at a position spaced apart from the support bracket (30), and a plurality of connecting plates (41) are provided on the upper surface, each having an insertion hole (41a) formed corresponding to the second guide hole (22) of the beam connecting plate (20), so that a bolt (P) coupled to the insertion hole (41a) is coupled to the second guide hole (22), thereby configuring the connecting bracket (40) to be installed on the front surface of the beam connecting plate (20).

[0042] In addition, the connecting bracket (40) is configured such that a plurality of second elastic plates (42) are provided on an upper surface adjacent to the connecting plate (41), thereby preventing the upper surface of the connecting bracket (40) from being excessively in contact with one side of the beam (2) and ensuring stable installation even when the connecting plate (41) is connected to the second guide hole (22), and a pair of connecting rings are provided spaced apart on the lower surface.

[0043] To explain the above configuration in more detail, when a column connecting plate (10) and a beam connecting plate (20) are respectively installed on the column (1) and the beam (2), the fixing plate (31) of the support bracket (30) is positioned to surround the first guide hole (12) of the column connecting plate (10), and then the support bracket (30) can maintain a firmly installed position through a bolt (P) connected to the connecting hole (31a) of the fixing plate (31). Additionally, the connecting plate (41) of the connecting bracket (40) is positioned to surround the second guide hole (22) of the beam connecting plate (20), and then a bolt (P) connected to the insertion hole (41a) of the connecting plate (41) is connected to the second guide hole (22), thereby allowing the connecting bracket (40) to maintain a firmly installed position.

[0044] In addition, even when such a combination is formed, the installation position of the support bracket (30) can be adjusted by controlling the connection position of the fixing plate (31) connected to the first guide hole (12) according to the user's choice, and the installation position of the connecting bracket (40) can be adjusted by controlling the connection position of the connecting plate (41) connected to the second guide hole (22), thereby making it easy to install the support bracket (30) and the connecting bracket (40) according to the form of connection between the column (1) and the beam (2) or the location to be installed.

[0045] And after the support bracket (30) and the connecting bracket (40) are installed, at least one elastic spring (47) is configured to be connected to the fixing ring (33) and the connecting ring (43), so that the support bracket (30) and the connecting bracket (40) are firmly elastically supported through the configuration of the elastic spring (47), thereby firmly supporting the connection between the columns and beams of the building and enabling seismic reinforcement of the building.

[0046] Meanwhile, as shown in FIGS. 1 to 6, the support bracket (30) is further configured with a first support bracket (34) having a long first support hole (34a) on the front surface adjacent to the beam (2), and the connecting bracket (40) is further configured with a second support bracket (44) having a long second support hole (44a) on the bottom surface adjacent to the column (1), and the first support bracket (34) and the second support bracket (44) are configured such that when the support bracket (30) and the connecting bracket (40) are installed, a bolt (P) inserted into the first support hole (34a) is coupled to the second support hole (44a) to firmly maintain the installation position of the support bracket (30) and the connecting bracket (40).

[0047] With the above configuration, when the support bracket (30) and the connecting bracket (40) are respectively installed on the front of the column (1) and the beam (2), the first support bracket (34) and the second support bracket (44) are positioned to form an overlapping shape, and then the bolt (P) connected to the first support hole (34a) is connected to the second support hole (44a) to firmly connect the first support bracket (34) and the second support bracket (44), thereby allowing the installation position of the support bracket (30) and the connecting bracket (40) to be firmly maintained. Furthermore, since the first support hole (34a) and the second support hole (44a) are formed in an elongated shape, even if the installation position of the support bracket (30) and the connecting bracket (40) moves slightly, the connection part of the first support bracket (34) and the second support bracket (44) is prevented from being damaged and a stable connection can be maintained.

[0048] Additionally, as shown in FIGS. 1 to 6, the support bracket (30) has a first mounting hole (35) further formed on the front surface adjacent to the end facing the first support bracket (34), and the connecting bracket (40) has a second mounting hole (45) further formed on the lower surface adjacent to the end facing the second support bracket (44); an installation bracket (50) is further installed in the first mounting hole (35) and the second mounting hole (45); the installation bracket (50) comprises a first installation plate (51) equipped with a first installation hole (51a) corresponding to the first mounting hole (35), a second installation plate (52) equipped with a second installation hole (52a) corresponding to the second mounting hole (45), and a bracket connecting the first installation plate (51) and the second installation plate (52), with both ends in the longitudinal direction on the upper surface The third mounting plate (53) is provided with a protruding bracket (53a) having a catch hole (53a-1) formed therein, and when the mounting bracket (50) is installed in the first mounting hole (35) and the second mounting hole (35), a support spring (54) is configured to be connected to the fixing ring (33) and the catch hole (53a-1) and to the connecting ring (43) and the catch hole (53a-1).

[0049] This is configured such that, after the support bracket (30) and the connecting bracket (40) are installed, the bolt (P) coupled to the first installation hole (51a) and the second installation hole (52a) is coupled to the first seating hole (35) and the second seating hole (45), thereby connecting the support bracket (30) and the connecting bracket (40) to the installation bracket (50) as shown in FIGS. 5 and 6. After this connection is made, the locking hole (53a-1) of the protruding bracket (53a) provided on the upper surface of the third installation plate (53) and the fixing ring (33) and the connecting ring (43a) are respectively connected by a support spring (54), thereby firmly maintaining the installation position of the support bracket (30) and the connecting bracket (40) while firmly supporting the connection between the column (1) and the beam (2) of the building through the elastic force of the support spring (54), thereby the building It is configured to enable seismic reinforcement.

[0050] Additionally, a first fastening plate (36) with a first through hole (36a) formed at both ends in the longitudinal direction is provided protruding between the fixed rings (33), and a second fastening plate (46) with a second through hole (46a) formed at both ends in the longitudinal direction is provided protruding between the connecting rings (43), and the fixed rings (33) and the first through hole (36a), the connecting rings (43) and the second through hole (46a), and the first through hole (36a) and the second through hole (46a) are connected by an elastic wire (60).

[0051] As shown in FIG. 6, this configuration allows the connection between the fixed ring (33) and the first through hole (36a), the connecting ring (43) and the second through hole (46a), and the first through hole (36a) and the second through hole (46a) to be more firmly supported by an elastic wire (60), thereby enabling the seismic reinforcement efficiency of the building to be further increased.

[0052] Meanwhile, in the present invention, at least one elastic spring (36) is connected to the fixing ring (33) and the connecting ring (43), and the locking hole (53a-1) of the protruding bracket (53a) is connected to the fixing ring (33) and the connecting ring (43) by a support spring (54), and the fixing ring (33) and the first through hole (36a), the connecting ring (43) and the second through hole (46a), and the first through hole (36a) and the second through hole (46a) are connected by an elastic wire (60). However, as shown in FIGS. 5 and 6, after the present invention is installed on the column (1) and beam (2) of a building, the elastic spring (36) is connected to the fixing ring (33), the connecting ring (43), the first fastening plate (36), the second fastening plate (46), and the protruding bracket (53a). Of course, the user can adjust the connection position of the support spring (54) and elastic wire (60) to more firmly support the connection part of the column (1) and beam (2) of the building.

[0053] Although the present invention has been illustrated and described in relation to specific embodiments, it will be obvious to those skilled in the art that the present invention can be variously modified and changed without departing from the gist or scope of the invention as provided by the following claims. Explanation of the symbols

[0055] 1: Column 2: Beam 10: Column connecting plate 11: Connecting hole 12: 1st guide hole 20: Beam connecting plate 21: Fastening hole 22: Second guide hole 30: Support bracket 31: Fixing plate 31a: Connecting hole 32: First elastic plate 33: Fixing hook 34: First support bracket 34a: First support hole 35: First seating hole 36: First fastening plate 36a: First penetration hole 40: Connecting bracket 41: Connecting plate 41a: Insertion hole 42: Second elastic plate 43: Connecting link 44: Second support bracket 45: Second set-up work 46: Second fastening plate 46a: Second penetration hole 47: Elastic spring 50: Installation bracket 51: First installation plate 51a: 1st installation hole 52: 2nd installation plate 52a: 2nd installation work 53: 3rd installation plate 53a: Protruding bracket 53a-1: Locking hole 54: Support spring 60: Elastic wire P: Bolt

Claims

Claim 1 In a seismic reinforcement structure connected to a column (1) and a beam (2) of a building, a column coupling plate (10) is installed on the front of the column (1) in a plate shape, having a plurality of coupling holes (11) formed in a portion corresponding to the column (1) and a plurality of first guide holes (12) formed at regular intervals along the length direction in a portion of the front center, a beam coupling plate (20) is installed on the front of the beam (2) in a plate shape, having a plurality of fastening holes (21) formed in a portion corresponding to the beam (2) and a plurality of second guide holes (22) formed at regular intervals along the length direction in a portion of the front center, and a plurality of fixing plates (31) are provided on the rear side, each having a connecting hole (31a) formed corresponding to the first guide hole (12), and a plurality of first elastic plates (32) are provided on the rear side adjacent to the fixing plates (31), and a pair of fixing rings (33) are provided spaced apart on the front side and connected to the connecting hole (31a). The structure comprises a support bracket (30) which is positionally adjustable and coupled to the front surface of the column coupling plate (10) via a bolt (P), a plurality of connecting plates (41) having insertion holes (41a) corresponding to the second guide holes (22) formed on the upper surface, a plurality of second elastic plates (42) having an upper surface adjacent to the connecting plates (41), and a pair of connecting rings (43) spaced apart on the lower surface, and a connecting bracket (40) which is positionally adjustable and coupled to the front surface of the beam coupling plate (20) adjacent to the support bracket (30) via a bolt (P) coupled to the insertion holes (41a), and an elastic spring (47) installed to be connected to at least one of the fixing rings (33) and the connecting rings (43), wherein the support bracket (30) is a first support bracket (34) having an elongated first support hole (34a) on the front surface adjacent to the beam (2). The connecting bracket (40) is further provided with a second supporting bracket (44) having a long second supporting hole (44a) on the lower surface adjacent to the column (1), and when the first supporting bracket (34) and the second supporting bracket (44) are installed, the connecting bracket (40) and the first supporting bracket (34) and the second supporting bracket (44) are installed.A seismic reinforcement structure for a building, characterized in that a bolt (P) inserted into the first support hole (34a) is coupled to the second support hole (44a) to firmly maintain the installation position of the support bracket (30) and the connecting bracket (40). Claim 2 delete Claim 3 In claim 1, the support bracket (30) further has a first mounting hole (35) formed on the front surface adjacent to the end facing the first support bracket (34), and the connecting bracket (40) further has a second mounting hole (45) formed on the lower surface adjacent to the end facing the second support bracket (44), and an installation bracket (50) is further installed in the first mounting hole (35) and the second mounting hole (45), and the installation bracket (50) comprises a first installation plate (51) equipped with a first installation hole (51a) corresponding to the first mounting hole (35), a second installation plate (52) equipped with a second installation hole (52a) corresponding to the second mounting hole (45), and a connecting bracket having a catch hole (53a-1) formed at both ends in the longitudinal direction on the upper surface. A seismic reinforcement structure for a building, characterized by including a third mounting plate (53) having a protruding bracket (53a) provided, and when the mounting bracket (50) is installed in the first mounting hole (35) and the second mounting hole (35), a support spring (54) is configured to be connected to the fixing ring (33) and the hook hole (53a-1) and the connecting ring (43) and the hook hole (53a-1). Claim 4 A seismic reinforcement structure for a building, characterized in that, in the first paragraph, a first fastening plate (36) with a first through hole (36a) formed at both ends in the longitudinal direction is provided protruding between the fixed rings (33), and a second fastening plate (46) with a second through hole (46a) formed at both ends in the longitudinal direction is provided protruding between the connecting rings (43), and the fixed rings (33) and the first through hole (36a), the connecting rings (43) and the second through hole (46a), and the first through hole (36a) and the second through hole (46a) are configured to be connected by an elastic wire (60).

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