Connector, connection structure, and method for manufacturing connection structure

Abstract

To provide a connector which enables a new PC steel material to be connected to an end part of an existing PC steel material even when a thread part is not formed on the perimeter of a fixed part for gripping the existing PC steel material.SOLUTION: A connector 10 for connecting a first PC steel material 12 and a second PC steel material comprises: a female member 16 that has a first through hole 161 capable of accommodating a first fixed part 15 that grips the first PC steel material; a male member 17 constituted to be insertable between the first fixed part and an inner peripheral surface of the first through hole; and a joint 18 that has a first male thread part 183 on a lateral face on a first end part 18A side in a longer direction and a second male thread part 184 on a lateral face on a second end part 18B side located opposite to the first end part in the longer direction. When an aperture of the first through hole on the side where the first fixed part is inserted is regarded as a first aperture, the first through hole has a first female thread part 162 to be engaged with the first male thread part, on an inner peripheral surface on the side of a second aperture located opposite to the first aperture.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a connector, a connection structure, and a method for manufacturing a connection structure. [Background technology]

[0002] Patent Document 1 describes a first wedge that grips a first PC steel strand, a first socket having a tapered hole into which the first wedge is fitted; a second wedge that grips the second prestressing steel strand; a second socket having a tapered hole into which the second wedge is fitted; a coupler sleeve that connects the first socket and the second socket in a state where the ends of the first prestressing steel strand and the second prestressing steel strand are butted against each other; a metallic coupler sheath that covers the periphery of the coupler sleeve and forms a filling space for the filler between the coupler sheath and the sleeve; the first socket has a male thread portion on its outer periphery, The coupler sleeve has an inner periphery at one end thereof having a female thread portion that screws into the male thread portion, The other end of the coupler sleeve has a bottom portion against which the second socket is abutted, and the bottom portion has a through hole through which the second PC steel strand is drawn out, which is a connection structure for PC steel strands. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-45280 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, in order to expand the width of an already constructed bridge girder or a building, a conventional connection structure has been used in which the ends of new prestressing steel members to be used in the expanded section are connected to the ends of existing prestressing steel members buried in the bridge girder or building using connectors.

[0005] The connection structure for PC steel strands disclosed in Patent Document 1 is based on the premise that a male thread is formed on the outer periphery of the first socket that holds the PC steel strands. However, in bridge girders and the like that were not constructed with expansion in mind, there are cases where a thread is not formed on the outer periphery of the anchor that holds the PC steel.

[0006] Therefore, the present disclosure aims to provide a connector that enables new PC steel to be connected to the end of existing PC steel even when a threaded portion is not formed on the outer periphery of the fixing device that holds the existing PC steel. [Means for solving the problem]

[0007] According to one aspect of the present disclosure, there is provided a connector for connecting a first PC steel member and a second PC steel member, comprising: a female member having a first through hole capable of accommodating a first fixing tool that grips the first PC steel member; a male member configured to be insertable between the first fixing tool and the inner circumferential surface of the first through hole; a joint including a first male threaded portion on a side surface of a first end portion in the longitudinal direction and a second male threaded portion on a side surface of a second end portion located opposite the first end portion in the longitudinal direction, When the opening of the first through hole on the side where the first fixing device is inserted is defined as the first opening, the first through hole provides a connector having a first female thread portion that engages with the first male thread portion on the inner surface of the second opening side located opposite the first opening. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a connector that enables new PC steel to be connected to the end of existing PC steel, even if a threaded portion is not formed on the outer periphery of the fixing device that holds the existing PC steel. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an explanatory diagram of a connector according to one embodiment of the present disclosure. [Figure 2A] FIG. 2A is an explanatory diagram of a connector according to another embodiment of the present disclosure. [Figure 2B] FIG. 2B is a bottom view of the joint of the connector shown in FIG. 2A. [Figure 3] FIG. 3 is an explanatory diagram of a connection structure according to one embodiment of the present disclosure. [Figure 4] FIG. 4 is a flow diagram of a method for manufacturing a connection structure according to one embodiment of the present disclosure. [Figure 5] FIG. 5 is an explanatory diagram of a configuration example in which a connection structure according to an embodiment of the present disclosure is installed on a bridge pier. DETAILED DESCRIPTION OF THE INVENTION

[0010] The embodiments for carrying out the invention are described below.

[0011] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. In the following description, the same or corresponding elements will be denoted by the same reference numerals, and the same description will not be repeated.

[0012] (1) A connector according to one embodiment of the present disclosure is a connector for connecting a first prestressing concrete steel member and a second prestressing concrete steel member, a female member having a first through hole capable of accommodating a first fixing tool that grips the first PC steel member; a male member configured to be insertable between the first fixing tool and the inner circumferential surface of the first through hole; a joint including a first male threaded portion on a side surface of a first end portion in the longitudinal direction and a second male threaded portion on a side surface of a second end portion located opposite the first end portion in the longitudinal direction, When the opening of the first through hole on the side where the first fixing device is inserted is defined as the first opening, the first through hole has a first female thread portion that engages with the first male thread portion on the inner surface on the second opening side located opposite the first opening.

[0013] A second male threaded portion is provided on the side surface of the second end of the joint. The joint is then fixed to a first fixing device that grips the first prestressing chain member via a female member and a male member. Therefore, even if the side surface of the first fixing device is not threaded, by installing a connector according to one embodiment of the present disclosure in the first fixing device, it is possible to connect the end of a new second prestressing chain member to the end of an existing first prestressing chain member using the second male threaded portion.

[0014] (2) The joint may be configured so that the first end of the joint comes into contact with the male member when the first end of the joint is inserted into the first through hole.

[0015] By configuring the first end of the joint to come into contact with the male component when the first end of the joint is inserted into the first through-hole of the female component, the male component can be firmly and evenly pressed between the first fixing device and the inner circumferential surface of the first through-hole. This allows the female component to be more firmly fixed to the first fixing device, thereby enhancing the strength of the connection structure manufactured using the connector according to one embodiment of the present disclosure.

[0016] (3) A protrusion may be provided on the first end of the joint.

[0017] By providing the protrusion, when the joint is inserted into the first through-hole of the female component, the male component can be more firmly pressed between the first fixing device and the inner circumferential surface of the first through-hole, which allows the female component to be more firmly fixed to the first fixing device, thereby making the connection structure manufactured using the connector according to one embodiment of the present disclosure stronger.

[0018] (4) One or more selected from the first male thread portion and the second male thread portion may be colored.

[0019] By coloring one or more selected from the first male threaded portion and the second male threaded portion, it is possible to easily confirm that the first male threaded portion is fully screwed into the first female threaded portion regardless of the brightness of the work area. In addition, because it is easy to visually confirm that the first male threaded portion is fully screwed into the first female threaded portion, the connector according to one embodiment of the present disclosure can be easily installed regardless of the worker's level of skill.

[0020] (5) further comprising a sleeve including a second through hole; The second through hole is a second female thread portion that is arranged on an inner circumferential surface of the second through hole on a third opening side and that engages with the second male thread portion of the joint; The second through hole may also have a third female thread portion that engages with a third male thread portion provided on the outer periphery of a second fixing device that grips the second PC steel material, and is arranged on the inner surface of a fourth opening side that is located opposite the third opening side of the second through hole.

[0021] Because the connector has a sleeve, the second anchor and the joint can be easily connected by bringing them close together and rotating the sleeve to change their position, making it easy to manufacture a connection structure that connects the first and second prestressing steel members.

[0022] (6) A connection structure according to one embodiment of the present disclosure is a connection structure connecting a first PC steel member and a second PC steel member, The first PC steel member; The second PC steel member; a connector that connects a first fixing device that grips the first PC tendon and a second fixing device that grips the second PC tendon, The connector comprises: a female member having a first through hole capable of accommodating the first fixing tool; a male member configured to be insertable between the first fixing tool and the inner circumferential surface of the first through hole; a joint having a first male threaded portion on a side surface of a first end portion in a longitudinal direction and a second male threaded portion on a side surface of a second end portion located opposite the first end portion in the longitudinal direction; a sleeve including a second through hole; When an opening of the first through hole on a side into which the first fixing tool is inserted is defined as a first opening, the first through hole has a first female thread portion that fits with the first male thread portion on an inner circumferential surface on a second opening side located opposite to the first opening, The second through hole is a second female thread portion that is arranged on an inner circumferential surface of the second through hole on a third opening side and that engages with the second male thread portion of the joint; The second through hole has a third female thread portion that is arranged on the inner surface of a fourth opening side, which is located opposite the third opening, and that engages with a third male thread portion provided on the outer periphery of the second fixing device.

[0023] In a connection structure according to one embodiment of the present disclosure, by installing a connector on the first fixing device that grips the first PC steel member, a connection structure can be achieved even if no threads are formed on the outer surface of the first fixing device.

[0024] The outer diameter of the connector used in the connection structure according to one embodiment of the present disclosure is, for example, largest at the female member portion. The outer diameter of the female member portion is the sum of the outer diameter of the first fixing device to be accommodated, the thickness of the male member that secures the first fixing device, and the thickness of the wall portion of the female member, which has the wall thickness necessary to support the second PC steel. Furthermore, there is no need to provide various components around the female member for connecting it to other components. Therefore, the outer diameter of the connector can be reduced, and the connection structure according to one embodiment of the present disclosure using this connector can be applied to places with limited installation space, such as bridges.

[0025] (7) A manufacturing method of a connection structure according to one aspect of the present disclosure is a manufacturing method of a connection structure in which a first prestressing concrete member and a second prestressing concrete member are connected by a connector, the manufacturing method comprising: The connector comprises: a female member having a first through hole capable of accommodating a first fixing tool that grips the first PC steel member; a male member configured to be insertable between the first fixing tool and the inner circumferential surface of the first through hole; a joint having a first male threaded portion on a side surface of a first end portion in a longitudinal direction and a second male threaded portion on a side surface of a second end portion located opposite the first end portion in the longitudinal direction; a sleeve including a second through hole; When an opening of the first through hole on a side into which the first fixing tool is inserted is defined as a first opening, the first through hole has a first female thread portion that fits with the first male thread portion on an inner circumferential surface on a second opening side located opposite to the first opening, The second through hole is a second female thread portion that is arranged on an inner circumferential surface of the second through hole on a third opening side and that engages with the second male thread portion of the joint; a third female thread portion that is arranged on the inner peripheral surface of the second through hole on the side of a fourth opening that is located opposite the third opening, and that engages with a third male thread portion that is provided on the outer periphery of a second fixing tool that grips the second PC steel member, The method for manufacturing the connection structure includes: a first installation step of inserting the first fixing tool that grips the first PC tendon into the first through hole from the first opening side of the first through hole of the female member; a second installation step of inserting a male member between the first fixing tool and an inner circumferential surface of the first through hole of the female member; a third installation step of installing the joint on the female member by inserting the first end side of the joint from the second opening side of the first through hole and screwing the first male thread portion of the joint into the first female thread portion of the first through hole; a connecting step of connecting the second fixing device and the joint by the sleeve, In the connection process, the second female thread portion arranged on the inner surface of the second through hole of the sleeve is engaged with the second male thread portion of the joint, and the third female thread portion arranged on the inner surface of the second through hole of the sleeve is engaged with the third male thread portion of the second fixing device.

[0026] According to a manufacturing method for a connection structure according to one embodiment of the present disclosure, by installing a connector on the first fixing device that grips the first PC steel member, a connection structure can be formed even if no threads are formed on the outer surface of the first fixing device.

[0027] The outer diameter of a connector used in a manufacturing method for a connection structure according to one embodiment of the present disclosure is, for example, largest at the female member portion. The outer diameter of the female member portion is the sum of the outer diameter of the first fixing device to be housed, the thickness of the male member that secures the first fixing device, and the thickness of the wall portion of the female member, which has the wall thickness required to support the second PC steel. Furthermore, there is no need to provide various components around the female member for connecting it to other components. This allows the outer diameter of the connector to be reduced, and a connection structure using this connector can be applied to places with limited installation space, such as bridges.

[0028] (8) In the third installing step, the first male threaded portion may be screwed into the first female threaded portion until the first male threaded portion is no longer visible from the outside.

[0029] By screwing the first male threaded portion into the first female threaded portion until it is no longer visible from the outside, the entire first joint portion can be housed within the first through-hole of the female member. This ensures a sufficient joining distance between the joint portion and the female member, and increases the joining strength between the joint and the female member.

[0030] (9) In the connecting step, the second fixing device and the joint may be connected by the sleeve so that the second fixing device and the joint are in contact with each other.

[0031] By connecting the second fixing device and the joint with the sleeve so that the second fixing device and the joint are in contact with each other, it is possible to increase the total joint distance between the second female thread and the third female thread of the sleeve and the second male thread of the joint and the third male thread of the second fixing device 33. This makes it possible to achieve a particularly strong connection structure.

[0032] [Details of the embodiments of the present disclosure] Specific examples of a connector, a connection structure, and a method for manufacturing a connection structure according to one embodiment of the present disclosure (hereinafter referred to as the "present embodiment") will be described below with reference to the drawings. Note that the present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0033] 〔connector〕 The connector according to this embodiment will be described below with reference to FIGS.

[0034] The connector of this embodiment relates to a connector for connecting a first prestressing steel member and a second prestressing steel member.

[0035] Fig. 1 is a schematic cross-sectional view of the connector of this embodiment, taken along a plane passing through the central axis CA of the first prestressing steel member 12. Fig. 2A is a schematic cross-sectional view of a modified version of the connector of this embodiment, taken along a plane passing through the central axis CA of the first prestressing steel member 12. Fig. 2B is a bottom view of a joint of the connector shown in Fig. 2A. Fig. 3 is an explanatory diagram of the connection structure of this embodiment.

[0036] 1, 2A, and 3, the longitudinal direction of the first prestressing steel member 12 is the X-axis, and the plane perpendicular to the longitudinal direction of the first prestressing steel member 12 is the YZ plane.

[0037] Before describing the connector of this embodiment, a first fixing device to which the connector of this embodiment is applied and a first PC steel member gripped by the first fixing device will be described. (1) First anchor, first PC steel As shown in Figure 1, a first prestressing steel member 12, which is an existing prestressing steel member, is buried inside a concrete structure 11. The first prestressing steel member 12 can be placed inside the concrete structure 11 via a sheath 13, for example, and grout can be filled between the first prestressing steel member 12 and the sheath 13.

[0038] The first prestressing steel member 12 is a prestressing steel member for introducing prestress, specifically compressive force, into the concrete structure 11, and may be a prestressing steel strand made of multiple strands twisted together, a prestressing steel rod, etc. The PC in the prestressing steel member, prestressing steel strand, and prestressing steel rod all stand for prestressed concrete.

[0039] The surface of the PC steel member may be coated with a resin such as an epoxy resin, if necessary.

[0040] The end 12A side of the first PC steel member 12 is held by the first fixing device 15 via a support plate 14, which is a plate-shaped body with a through hole in the center for passing the first PC steel member 12 through.

[0041] The bearing plate 14 is sometimes called a casting plate or an anchor plate. The bearing plate 14 is a thick piece of steel, and is capable of supporting the tension force introduced into the first PC strand 12. The bearing plate 14 can be buried within the concrete structure 11 as shown in Figure 1, or can be placed on the surface of the concrete structure 11.

[0042] The configuration of the first fixing tool 15 is not particularly limited, but the first fixing tool 15 can have, for example, a first female cone 151 and a first male cone 152.

[0043] The outer shape of the first female cone 151 is not particularly limited, and may have, for example, a cylindrical shape. The first female cone 151 may have a chamfered portion or the like at the end, so it does not have to be a perfect cylindrical shape.

[0044] The first female cone 151 may have a through hole along its central axis in which the first PC steel member 12 and the first male cone 152 are disposed.

[0045] The through hole of the first female cone 151 can have a tapered surface whose diameter increases from the end on the concrete structure 11 side toward the end 12A of the first PC steel member 12.

[0046] The first male cone 152 may have multiple male cone segments split circumferentially when viewed from the end 12A of the first PC tendon 12 along the central axis of the first PC tendon 12, i.e., when viewed along the X-axis in the figure. When multiple male cone segments are combined, the first male cone 152 has an outer shape corresponding to the through hole with a tapered surface of the first female cone 151, and may have, for example, a truncated cone shape. When multiple male cone segments are combined, the first male cone 152 may have a through hole along its central axis for passing and gripping the first PC tendon 12.

[0047] The inner surface of the through hole that the first male cone 152 has along its central axis can be formed with irregularities to firmly grip the first PC steel member 12, and for example, a female thread surface can be formed thereon.

[0048] When the first PC steel member 12 is fixed by the first fixing device 15, the first female cone 151 is installed so that the first PC steel member 12 passes through the through hole of the first female cone 151. At this time, the first female cone 151 is installed so that the opening of the smaller size of the through hole of the first female cone 151 is positioned on the concrete structure 11 side.

[0049] Then, the first male cone 152 is inserted between the inner circumferential surface of the through hole of the first female cone 151 and the first PC steel member 12. The first male cone 152 functions as a wedge, tightening the first PC steel member 12 and fixing the first fixing device 15 to the first PC steel member 12.

[0050] PC steel strands are used by being embedded in concrete structures such as bridge girders. By applying tension to the PC steel strands embedded in the concrete structure, compressive force is applied to the concrete structure, making it prestressed concrete, which can partially or completely counteract the tensile stress that occurs when a load is applied to the concrete structure. Making a concrete structure prestressed concrete can prevent cracks from occurring in the concrete structure.

[0051] For example, when expanding the width of an already constructed bridge girder, it is preferable to connect the ends of the prestressing tendons embedded in the already constructed bridge girder with the ends of the prestressing tendons to be used in the expanded section using connectors to form a connection structure. The above connection structure refers to a structure in which the longitudinal ends of the existing prestressing tendons and the newly installed prestressing tendons are butted together and connected using connectors. This connection structure eliminates the need to install additional components to secure the new prestressing tendons to be used in the expanded section, for example by demolishing part of the already constructed bridge girder.

[0052] However, in bridge girders and the like that were not constructed with expansion in mind, there are cases where the fixing devices that hold the prestressing tendons do not have threaded portions formed on the periphery, making it impossible to form a connection structure. Therefore, the inventors of the present invention studied a connector that can connect to new prestressing tendons even when the fixing devices that hold existing prestressing tendons embedded in a concrete structure do not have threaded portions formed on the periphery.

[0053] As a result, it was found that by attaching the connector of this embodiment to the first fixing device that grips the first end side of the first PC steel, a connection structure can be formed with the second PC steel used in the expansion section even if a threaded portion is not formed on the side of the first fixing device.

[0054] The connector of this embodiment may have a female member, a male member, and a joint. Each member of the connector of this embodiment will be described below. (2) About the connector components (2-1) Female member The female member 16 of the connector 10 of this embodiment can have a first through-hole 161 capable of accommodating the first fixing tool 15 that grips the first PC steel member 12. (First through hole) The inner diameter and shape of the first through-hole 161 can be selected so that the first fixing tool 15 can be accommodated therein.

[0055] In the first through hole 161 of the female member 16, the opening on the side where the first fastener 15 is inserted, i.e., the inserting side, is referred to as the first opening 161A. The first opening 161A is located on the first end 16A side of the female member 16 that is located on the concrete structure 11 side as shown in FIG. 1. The first through hole 161 can have a second opening 161B located on the opposite side to the first opening 161A, i.e., on the second end 16B side.

[0056] In addition, when it is necessary to distinguish the first end 16A and the second end 16B of the female member 16 from the first end 18A and the second end 18B of the joint described later, they can also be referred to as the first female member end, the second female member end, etc.

[0057] As described above, the first opening 161A of the first through-hole 161 is an opening on the side where the first fixing tool 15 is inserted. Therefore, the inner diameter D161A of the first opening 161A can be made larger than the outer diameter D15 of the first fixing tool 15 so that the first fixing tool 15 can be inserted and accommodated.

[0058] Furthermore, the second opening 161B of the first through hole 161 is an opening for inserting a first end 18A side of the joint 18, which will be described later. For this reason, it is preferable that the inner diameter D161B of the second opening 161B of the first through hole 161 is equal to or greater than the outer diameter D1811 of the joint 18 on the first end 18A side.

[0059] As described above, the inner diameter D161A of the first opening 161A and the inner diameter D161B of the second opening 161B can be selected. Therefore, the inner diameter D161A of the first opening 161A and the inner diameter D161B of the second opening 161B may be different.

[0060] The first through-hole 161 may have two or more regions with different inner diameters or shapes. For example, as shown in Fig. 1, the first through-hole 161 may have a first region 1611 located on the first opening 161A side and a second region 1612 located on the second opening 161B side.

[0061] First inner peripheral surface 16C, which is the inner peripheral surface of first region 1611, can be tapered so that when, for example, male member 17 described below is inserted between first fixing device 15 and first inner peripheral surface 16C of female member 16, first fixing device 15 can be tightened and connector 10 can be fixed to the first fixing device. Because male member 17 is inserted from the second opening 161B side, first inner peripheral surface 16C is preferably tapered so that the diameter increases from the first opening 161A side toward the second opening 161B side.

[0062] The shape and size of the second region 1612 can be selected so that a first end 18A side of the joint 18, which will be described later, can be inserted therein.

[0063] As described above, the second opening 161B is an opening for inserting the first end 18A side of the joint 18. Then, the joint 18 is fixed to the female member 16. For this reason, the female member 16 can have, on the second inner circumferential surface 16D on the second opening 161B side, a first female thread portion 162 that mates with a first male thread portion 183 provided on the first end 18A side of the joint 18. (jig hole) As will be described later, a joint 18, which will be described later, can be inserted and screwed into a first through-hole 161 of the female member 16. When screwing in the joint 18, it is preferable to also hold the female member 16 so that it does not rotate.

[0064] Therefore, the female member 16 may have a jig hole 163 for fixing a jig to the female member 16 when, for example, screwing the joint 18 into the first through hole 161 of the female member 16. The arrangement, number, etc. of the jig holes 163 are not particularly limited, but it is preferable to provide them on the outer surface of the female member 16, for example. (2-2) Male member The male member 17 is configured so as to be insertable between the first fixing tool 15 and the first inner circumferential surface 16C of the first through-hole 161 of the female member 16.

[0065] The male member 17 is inserted between the first fixing tool 15 and the female member 16 to function as a wedge, thereby fixing the female member 16 to the first fixing tool 15.

[0066] As shown in Figure 1, the male member 17 can have multiple male member segments 171, 172 divided along the circumferential direction. Although an example in which the male member 17 is divided into two male member segments is shown here, the male member 17 can also be divided into three or more male member segments. The male member can also be formed from a single member without being divided.

[0067] When multiple male member segments 171, 172 are combined, male member 17 has a through-hole along its central axis, i.e., the X-axis in the figure, for accommodating and gripping at least a portion of first fixing device 15. The surface of male member 17 facing first fixing device 15, i.e., the surface in contact with first fixing device 15, may be formed with irregularities, or may be formed with a female thread surface, for example, to firmly grip first fixing device 15.

[0068] The size of the through hole of the male member 17 can be selected so as to accommodate the first fixing device 15 therein.

[0069] JIS G 3536 (2014) specifies a PC steel strand having an outer diameter of 21.8 mm, which is made by twisting together 19 strands (PC steel wires). A cylindrical fastener having a maximum diameter of 60 mm to 70 mm in a cross section perpendicular to the central axis is generally used to grip the end of the PC steel strand having an outer diameter of 21.8 mm. When the first fastener 15 is the above-described fastener, the size of the through hole of the male member 17 can be selected so as to accommodate a cylindrical first fastener 15 having a maximum diameter of 60 mm to 70 mm in a cross section perpendicular to the central axis.

[0070] As described above, the male member 17 can be configured so as to be insertable between the outer periphery 151A of the first fixing tool 15 and the first inner circumferential surface 16C of the first through hole 161 of the female member 16. Therefore, when multiple male member segments 171, 172 are combined, the male member 17 can have an outer shape corresponding to the first inner circumferential surface 16C of the first through hole 161 of the female member 16. Therefore, the outer surface along the length direction of the first through hole 161, i.e., the X-axis direction in FIG. 1, can have a tapered shape that widens from the first opening 161A side to the second opening 161B side of the female member 16. Therefore, the male member 17 can have an outer shape, for example, a truncated cone shape.

[0071] 1, a slit or the like can be provided in the male member 17 along the X-axis direction in Fig. 1. By providing the slit in the male member 17, the male member 17 can be easily deformed when inserted between the first fixing tool 15 and the first inner circumferential surface 16C of the first through-hole 161 of the female member 16, and the female member 16 can be more firmly fixed to the first fixing tool 15. (2-3) Joint The joint 18 can have a first male threaded portion 183 on a side surface 18C on the first longitudinal end 18A side, and a second male threaded portion 184 on a side surface 18D on the second longitudinal end 18B side, which is located opposite the first longitudinal end 18A.

[0072] The joint 18 is a member for connecting the female member 16 fixed to the first fixing device 15 to another member such as the sleeve 31 described below. For this reason, the joint 18 can have a first male thread portion 183 for fixing to the female member 16 as described above, and a second male thread portion 184 for connecting to another member such as the sleeve 31.

[0073] The joint 18 can have a first joint portion 1811 disposed on the first end portion 18A side and a second joint portion 1812 disposed on the second end portion 18B side. As shown in FIG. 1, the first joint portion 1811 and the second joint portion 1812 can have a cylindrical outer shape, and their respective outer diameters can be selected to match the first through-hole 161 of the female member 16 and the sleeve 31 (described later). Therefore, the outer diameters of the first joint portion 1811 and the second joint portion 1812 can be the same or different. A first male thread portion 183 and a second male thread portion 184 can be disposed on a side surface 18C of the first joint portion 1811 and a side surface 18D of the second joint portion 1812, respectively. Therefore, the cylindrical shape described above does not have a strict geometrical meaning. (First joint part) The first joint part 1811 can be inserted into the first through hole 161 from the second opening 161B side of the female member 16. Therefore, the outer diameter D1811 of the first joint part 1811 can be sized to correspond to the inner diameter D161B of the second opening 161B of the first through hole 161 of the female member 16, and for example, the outer diameter D1811 and the inner diameter D161B can be made equal.

[0074] The first male threaded portion 183 can be configured to be able to mate (screw-fit) with the first female threaded portion 162 of the female member 16 .

[0075] When the joint 18 is installed in the female member 16, it is preferable that the entire first joint portion 1811 is housed in the first through-hole 161 of the female member 16. In other words, when the joint 18 is installed in the female member 16, it is preferable that the third end 18E of the first joint portion 1811 located on the second end 18B side coincides with the second end 16B of the female member 16.

[0076] This is because by accommodating the entire first joint portion 1811 within the first through hole 161 of the female member 16, a sufficient joining distance between the joint 18 and the female member 16 can be ensured, thereby increasing the joining strength between the joint 18 and the female member 16.

[0077] Therefore, it is preferable that the first joint part 1811 is configured so that it can be easily confirmed that the first male threaded part 183 provided on the side surface 18C of the first joint part 1811 is completely screwed into the first female threaded part 162 provided in the first through hole 161 of the female member 16.

[0078] Specifically, for example, it is preferable that one or more selected from the first male thread portion 183 and the second male thread portion 184 be colored, and it is particularly preferable that the first male thread portion 183 be colored.

[0079] If the first male thread portion 183 is colored, it can be confirmed that the first male thread portion 183 has been completely screwed into the first female thread portion 162 when the color of the first male thread portion 183 becomes invisible.

[0080] If the second male threaded portion 184 is colored, when the colored portion of the second male threaded portion 184 reaches the second end 16B of the female member 16, it can be confirmed that the first male threaded portion 183 has been completely screwed into the first female threaded portion 162.

[0081] The work of installing the connector 10 of this embodiment in the first fixing device 15 may be performed in a dark space surrounded by a concrete structure 11 or the like. For this reason, by coloring one or more selected from the first male thread portion 183 and the second male thread portion 184, it is possible to easily confirm that the first male thread portion 183 is completely screwed into the first female thread portion 162, regardless of the brightness of the work area. Furthermore, because it is easy to visually confirm that the first male thread portion 183 is completely screwed into the first female thread portion 162, the connector of this embodiment can be easily installed regardless of the worker's level of skill.

[0082] When one or more selected from the first male thread portion 183 and the second male thread portion 184 are colored, the color is not particularly limited as long as it is a color different from the color of the uncolored members located nearby. However, from the viewpoint of particularly improving visibility, it is preferable that the color be a warm color or a fluorescent color.

[0083] In the connector 10 shown in Figure 1, when the joint 18 is inserted into the first through hole 161 of the female member 16 and screwed in, the joint 18 and the male member 17 are not in contact with each other, but this is not limited to such a configuration.

[0084] For example, the first end 18A of the joint 18 can be configured to come into contact with the male member 17 when inserted into the first through-hole 161 of the female member 16.

[0085] As described above, by inserting the male member 17 between the outer periphery 151A of the first fixing device 15 and the first inner periphery 16C of the first through-hole 161 of the female member 16, the male member 17 functions as a wedge and secures the female member 16 to the first fixing device 15. However, if the male member 17 is not inserted sufficiently, or if the male member 17 is configured with multiple male member segments 171, 172 and the multiple male member segments 171, 172 are not evenly inserted, the force securing the female member 16 to the first fixing device 15 may be reduced. If the force securing the female member 16 to the first fixing device 15 is insufficient, the male member 17 or the female member 16 may come off the first fixing device 15 when tension is applied to the second prestressing tendon after connection.

[0086] In contrast, by configuring the first end 18A of the joint 18 to come into contact with the male member 17 when the first end 18A side of the joint 18 is inserted into the first through-hole 161 of the female member 16, the male member 17 can be pressed firmly and evenly between the outer periphery 151A of the first fixing device 15 and the first inner circumferential surface 16C of the first through-hole 161. This allows the female member 16 to be more firmly fixed to the first fixing device 15, and the connection structure manufactured using the connector of this embodiment can be made stronger. (Convex part) Also, as in the case of connector 20 shown in FIG. 2A, for example, first end 18A of joint 18 may be provided with protrusion 21.

[0087] By providing the protrusion 21, when the joint 18 is screwed into the first through-hole 161 of the female member 16, the male member 17 can be more firmly pressed between the first fixing device 15 and the first inner circumferential surface 16C of the first through-hole 161. This allows the female member 16 to be more firmly fixed to the first fixing device 15, and the connection structure manufactured using the connector of this embodiment can be made stronger.

[0088] The protrusion 21 can be provided on the first end 18A of the joint 18, specifically the portion facing the male component 17, and its shape is not particularly limited. FIG. 2B shows a bottom view of the joint 18 having the protrusion 21, i.e., a view seen from the first end 18A side along the X-axis. As shown in FIG. 2B, the protrusion 21 can have an annular shape. While FIG. 2B shows the protrusion 21 as a continuous annular shape, it can also be formed, for example, in a dotted line shape.

[0089] Connector 20 shown in FIG. 2A can be configured in the same manner as connector 10 described with reference to FIG. 1, except that joint 18 is provided with protrusion 21. (Second joint) The second joint part 1812 is a member for connecting to other members such as the sleeve 31 described later. Therefore, the outer diameter D1812 of the second joint part 1812 can be selected according to the member to be connected, and can be set to a size corresponding to the inner diameter of a third opening 311A ​​of the sleeve 31 described later, for example, or can be set equal to the inner diameter of the third opening 311A.

[0090] A second male thread portion 184 is provided on a side surface 18D of the joint 18 on the second end portion 18B side, specifically, on the side surface 18D of the second joint portion 1812. The joint 18 is fixed to the first fixing device 15, which grips the first prestressing chain steel 12, via the female member 16 and the male member 17. Therefore, even if the side surface of the first fixing device 15 is not threaded, by installing the connector 10 of this embodiment on the first fixing device 15, it is possible to connect the end portion of a new second prestressing chain steel to the end portion 12A of the existing first prestressing chain steel 12 using the second male thread portion 184. (Through hole) The joint 18 may have a through hole 182 along the central axis as needed, so that when installed in the female member 16, it does not interfere with the first prestressing steel member 12 gripped by the first fixing device 15 housed in the female member 16. The inner diameter of the through hole 182 may be equal to or greater than the outer diameter of the first prestressing steel member 12. (jig hole) As shown in FIG. 1, the joint 18 has a first male threaded portion 183 and a second male threaded portion 184 on the side surface 18C and the side surface 18D, and therefore, when installing the joint 18 on the female member 16, it may be difficult for the worker to hold the joint 18 and screw the first male threaded portion 183 into the first female threaded portion 162.

[0091] Therefore, the joint 18 may have a jig hole 185 for fixing a jig to the joint 18 when the first male threaded portion 183 is screwed into the first female threaded portion 162 .

[0092] 2A , when joint 18 has protrusion 21 on first end 18A, by attaching a jig to jig holes 163 and 185 and screwing joint 18, male member 17 can be press-fit deeper between outer periphery 151A of first fixing device 15 and first inner circumferential surface 16C of first through hole 161 of female member 16. As a result, female member 16 can be firmly fixed to first prestressing steel member 12, and the female member 16 can be prevented from slipping from first fixing device 15 when tension is applied to the second prestressing steel member after connection.

[0093] The arrangement and number of the jig holes 185 are not particularly limited, but it is preferable to provide them on the second end 18B side, for example. (2-4) Sleeve The connector of this embodiment may further include a sleeve 31 having a second through hole 311 .

[0094] The sleeve 31 will be described using Figure 3. Figure 3 is a schematic cross-sectional view of a connection structure 30 connecting a first prestressing steel member 12 and a second prestressing steel member 32, taken along a plane passing through the central axis CA of the first prestressing steel member 12.

[0095] The sleeve 31 can have a cylindrical shape and can connect the joint 18 to a second fixing device 33 that grips the second PC steel member 32.

[0096] The second through hole 311 can have a second female thread portion 321 that is arranged on the inner circumferential surface 31A of the second through hole 311 on the third opening 311A ​​side and that mates with the second male thread portion 184 of the joint 18.

[0097] The second through hole 311 can have a third female thread portion 322 that engages with a third male thread portion 333 provided on the outer periphery 33A of the second fixing device 33 that grips the second PC steel material 32, and is arranged on the inner surface 31B on the side of the fourth opening 311B, which is located opposite the third opening 311A ​​of the second through hole 311.

[0098] The inner surface of the second through hole 311 may be provided with a female thread portion that continues from the third opening 311A ​​side to the fourth opening 311B, and the female thread portion may be configured to include the above-mentioned second female thread portion 321 and third female thread portion 322.

[0099] The sleeve 31 is initially attached to the outer periphery 33A of the second fixing device 33, and the second fixing device 33 can be positioned, for example, so that the end face of the second fixing device 33 on the end 32A side of the second PC steel member 32 comes into contact with the second end 18B of the joint 18. In Figure 3, a pressing plate 34 that holds down the second male cone 332 is positioned on the second fixing device 33, and therefore the various components are positioned so that the end face 35A of the bolt 35 that secures the pressing plate 34 comes into contact with the second end 18B of the joint 18.

[0100] Then, by rotating the sleeve 31, the sleeve 31 is moved toward the joint 18, and the second female thread portion 321 of the sleeve 31 is fitted into the second male thread portion 184 of the joint 18, thereby fixing the second fixing device 33 to the first fixing device 15 via the connector 10. In other words, a connection structure 30 can be created that connects the first PC steel member 12 and the second PC steel member 32.

[0101] As described above, the second fixing device 33 is positioned so that the end face of the second fixing device 33 contacts the second end 18B of the joint 18, and then the sleeve 31 is rotated to displace the position of the sleeve 31, thereby connecting the second fixing device 33 to the joint 18. For this reason, it is preferable that the second male thread portion 184 and the third male thread portion 333 have threads in the same direction.

[0102] The second male thread portion 184 and the third male thread portion 333 are threaded in the same direction, meaning that the threads are configured to have the same direction, for example, the second male thread portion 184 is a right-handed thread and the third male thread portion 333 is a right-handed thread.

[0103] As described above, it is preferable that the first male threaded portion 183 be threaded in the same direction as the second male threaded portion 184 and the third male threaded portion 333 so that the connection between the joint 18 and the female member 16 does not loosen when the sleeve 31 is rotated.

[0104] As described above, because connector 10 has sleeve 31, second fixing device 33 and joint 18 can be easily connected by bringing them close together and then rotating sleeve 31 to displace the position of sleeve 31. This makes it easy to manufacture a connection structure that connects first PC steel member 12 and second PC steel member 32.

[0105] The configuration of the second fixing tool 33 is not particularly limited, but may have a second female cone 331 and a second male cone 332, similar to the first fixing tool 15. The second female cone 331 and the second male cone 332 may be configured in the same manner as the first female cone 151 and the first male cone 152, respectively, and therefore a description thereof will be omitted.

[0106] The second fixing device 33 is a fixing device that grips the second prestressing steel member 32, which is the prestressing steel member on the new installation side, and therefore can have the third male thread portion 333 on the outer periphery 33A as described above.

[0107] The second fixing device 33 is preferably shipped from the factory already attached to the second prestressing steel member 32, for example. For this reason, a retaining plate 34 can be attached to prevent the second male cone 332 of the second fixing device 33 from coming off. The retaining plate 34 can have a plate portion 341 that contacts the second male cone 332 and a through-hole portion 342 through which the second prestressing steel member 32 passes. The retaining plate 34 can be fixed to the second fixing device 33 with bolts 35. (3) Connector materials The material of the connector of this embodiment is not particularly limited, and can be selected according to the strength required when connecting the first PC steel member 12 and the second PC steel member 32, etc.

[0108] The material of the connector of this embodiment is preferably a metal material, and more preferably one or more types selected from, for example, chromium-molybdenum steel, carbon steel, etc. Examples of chromium-molybdenum steel include alloy steel for mechanical structures such as SCM435 and SCM415, and examples of carbon steel include carbon steel for mechanical structures such as S45C. [Connection structure] Next, the connection structure of this embodiment will be described.

[0109] The connection structure of this embodiment connects a first prestressing steel member and a second prestressing steel member, and may include the above-mentioned connector that connects the first prestressing steel member, the second prestressing steel member, a first anchoring device that grips the first prestressing steel member, and a second anchoring device that grips the second prestressing steel member. Therefore, the details already explained about the connector will not be explained here.

[0110] The connection structure of this embodiment can have, for example, a connection structure 30 shown in Fig. 3. Therefore, the description will be given with reference to Fig. 3.

[0111] The connection structure 30 of this embodiment is a structure in which a second prestressing steel member 32 is connected to a first prestressing steel member 12, whose longitudinal end 12A is held by a first fixing device 15. The connection structure 30 may include the first prestressing steel member 12, the first fixing device 15, a connector 100, the second prestressing steel member 32, and a second fixing device 33. The connector 100 may have a female member 16, a male member 17, a joint 18, and a sleeve 31. The connector 100 has the same configuration as the connector 10 of FIG. 1 except for the sleeve 31. The joint 18 of the connector 100 may be configured to have a protrusion 21, as in the connector 20 shown in FIG. 2.

[0112] The connection structure 30 of this embodiment may further be configured such that a cap 36 is provided to cover the connector 10, and a filler is filled from either a first pipe 361 or a second pipe 362 provided on the side of the cap 36. The material of the filler is not particularly limited, and various fillers can be used, for example, one or more types selected from epoxy resin, pre-grout resin, wax, cement grout, asphalt, etc.

[0113] In the connection structure 30 of this embodiment, by installing a connector 100 on the first fixing device 15 that grips the first PC steel member 12, a connection structure can be formed even if no threads are formed on the outer surface of the first fixing device 15.

[0114] The outer diameter of the connector 100 used in the connection structure 30 of this embodiment is largest, for example, at the female member 16. The outer diameter of the female member 16 is the sum of the outer diameter of the first fixing device 15 to be accommodated, the thickness of the male member 17 that secures the first fixing device 15, and the thickness of the wall portion of the female member 16, which has a wall thickness necessary to support the second PC steel member 32. Furthermore, there is no need to provide various components around the female member 16 for connecting to other components. This allows the outer diameter of the connector 10 to be reduced, and the connection structure of this embodiment using the connector 10 can be applied to places with limited installation space, such as bridges. [Method of manufacturing the connection structure] A method for manufacturing the connection structure of this embodiment will be described.

[0115] In the method for manufacturing the connection structure of this embodiment, the connection structure described above can be manufactured using the connector described above, and therefore, some of the matters already described for the connector and the connection structure will not be described again.

[0116] The manufacturing method of the connection structure of this embodiment relates to a manufacturing method of a connection structure in which a first PC steel member and a second PC steel member are connected by a connector. The manufacturing method of the connection structure of this embodiment can be carried out according to the flowchart shown in Figure 4, and can include the following first installation step (S1), second installation step (S2), third installation step (S3), and connection step (S4).

[0117] Each step will be described below. (1) First installation process (S1) In the first installation step (S1), a first fixing tool 15 that grips the first PC steel member 12 can be inserted into the first through hole 161 from the first opening 161A side of the first through hole 161 of the female member 16.

[0118] The first PC tendon 12 is a PC tendon already installed in the concrete structure 11. Therefore, in the first installation step (S1), as shown in FIG. 3 , the female member 16 is placed over the first fixing device 15 exposed from the concrete structure 11, and the female member 16 can be installed so that the first fixing device 15 is positioned within the first through hole 161 of the female member 16. From the viewpoint of stabilizing the connection structure 30, it is preferable to install the female member 16 so that the first end 16A of the female member 16 contacts the support plate 14.

[0119] When the first installation step (S1) is carried out, an installation jig for the female member 16 can be placed in the jig hole 163 as needed, and the female member 16 can be supported by the installation jig. (2) Second installation process (S2) In the second installation step (S2), the male member 17 can be inserted between the first fixing tool 15 and the first inner circumferential surface 16C of the first through-hole 161 of the female member 16.

[0120] In the second installation step (S2), by inserting the male member 17 between the first fixing tool 15 and the first inner circumferential surface 16C of the first through-hole 161 of the female member 16, the male member 17 functions as a wedge, connecting the first fixing tool 15 and the female member 16. In other words, by performing the second installation step (S2), the female member 16 can be fixed to the first fixing tool 15.

[0121] As described above, the male member 17 can also be configured by combining multiple male member segments 171, 172. In this case, in the second installation step (S2), the multiple male member segments 171, 172 are inserted between the first fixing tool 15 and the first inner circumferential surface 16C of the first through-hole 161 of the female member 16.

[0122] In the second installation process (S2), a hammer or various jigs can be used to press the male member 17, and the male member 17 can be pressed into between the first fixing device 15 and the first inner surface 16C of the first through hole 161 of the female member 16.

[0123] As described above, when the male member 17 has multiple male member segments 171, 172, it is preferable that the multiple male member segments 171, 172 are evenly inserted between the first fixing device 15 and the first inner surface 16C of the first through hole 161 of the female member 16. (3) Third installation process (S3) In the third installation process (S3), the first end 18A side of the joint 18 can be inserted from the second opening 161B side of the first through hole 161, and the first male thread portion 183 of the joint 18 can be screwed into the first female thread portion 162 of the first through hole 161.

[0124] As described above, the joint 18 has the first male thread portion 183 on the first end portion 18A side. Therefore, the joint 18 can be installed on the female member 16 by screwing the first male thread portion 183 of the joint 18 into the first female thread portion 162 of the first through hole 161 that the female member 16 has.

[0125] 3, joint 18 has first male thread portion 183 and second male thread portion 184 on side surface 18C and side surface 18D, and therefore when installing joint 18 on female member 16, it may be difficult for an operator to hold joint 18 and screw first male thread portion 183 into first female thread portion 162. Therefore, joint 18 may have jig hole 185 for fixing a jig to joint 18 when screwing first male thread portion 183 into first female thread portion 162.

[0126] Then, in the third installation step (S3), an installation jig for joint 18 can be installed in joint 18 via jig hole 185. The worker can then rotate joint 18 using the installation jig for joint 18 and screw the first male thread portion 183 of joint 18 into the first female thread portion 162 of the first through hole 161. At this time, the installation jig for female member 16 can also be placed in jig hole 163 of female member 16, and the worker can grip the installation jig for female member 16 to prevent female member 16 from rotating.

[0127] In the third installation step (S3), when installing the joint 18 on the female member 16, it is preferable that the entire first joint portion 1811 of the joint 18 is housed in the first through-hole 161 of the female member 16. In other words, when installing the joint 18 on the female member 16, it is preferable that the third end 18E of the first joint portion 1811 located on the second end 18B side coincides with the second end 16B of the female member 16. Therefore, in the third installation step (S3), it is preferable that the first male threaded portion 183 is screwed into the first female threaded portion 162 until the first male threaded portion 183 is no longer visible from the outside.

[0128] By screwing the first male threaded portion 183 into the first female threaded portion 162 until the first male threaded portion 183 is no longer visible from the outside, the entire first joint portion 1811 can be housed within the first through-hole 161 of the female member 16. This ensures a sufficient joining distance between the joint 18 and the female member 16, and increases the joining strength between the joint 18 and the female member 16.

[0129] As described above, it is also possible to configure the first joint part 1811 so that it can be easily confirmed that the first male threaded portion 183 provided on the side surface 18C of the first joint part 1811 has been completely screwed into the first female threaded portion 162 provided in the first through-hole 161 of the female member 16. Specifically, for example, it is also possible to configure the first male threaded portion 183 and / or the second male threaded portion 184 to be colored. In this case, it is particularly preferable that the first male threaded portion 183 be colored.

[0130] If the first male thread portion 183 is colored, it can be confirmed that the first male thread portion 183 has been completely screwed into the first female thread portion 162 when the color of the first male thread portion 183 becomes invisible.

[0131] If the second male threaded portion 184 is colored, when the colored portion of the second male threaded portion 184 reaches the second end 16B of the female member 16, it can be confirmed that the first male threaded portion 183 has been completely screwed into the first female threaded portion 162.

[0132] The work of installing the connector 10 of this embodiment in the first fixing device 15 may be performed in a dark space surrounded by a concrete structure 11 or the like. For this reason, by coloring one or more selected from the first male thread portion 183 and the second male thread portion 184, it is possible to easily confirm that the first male thread portion 183 is completely screwed into the first female thread portion 162, regardless of the brightness of the work area. Furthermore, because it is easy to visually confirm that the first male thread portion 183 is completely screwed into the first female thread portion 162, the connector of this embodiment can be easily installed regardless of the worker's level of skill.

[0133] In the connection structure 30 shown in FIG. 3, the joint 18 and the male member 17 are not in contact with each other, but the present invention is not limited to this.

[0134] In the third installation step (S3), the joint 18 can be configured so that when the joint 18 is inserted into the first through-hole 161 of the female member 16, the first end 18A of the joint 18 comes into contact with the male member 17.

[0135] As described above, by inserting the male member 17 between the outer periphery 151A of the first fixing device 15 and the first inner periphery 16C of the first through-hole 161 of the female member 16, the male member 17 functions as a wedge and secures the female member 16 to the first fixing device 15. However, if the male member 17 is not inserted sufficiently, or if the male member 17 is configured with multiple male member segments 171, 172 and the multiple male member segments 171, 172 are not evenly inserted, the force securing the female member 16 to the first fixing device 15 may be reduced. If the force securing the female member 16 to the first fixing device 15 is insufficient, the male member 17 or the female member 16 may come off the first fixing device 15 when tension is applied to the second prestressing tendon after connection.

[0136] In contrast, by configuring the joint 18 so that the first end 18A of the joint 18 comes into contact with the male member 17 when the joint 18 is inserted into the first through-hole 161 of the female member 16, the male member 17 can be pressed firmly and evenly between the outer periphery 151A of the first fixing device 15 and the first inner circumferential surface 16C of the first through-hole 161. This allows the female member 16 to be more firmly fixed to the first fixing device 15, and the connection structure manufactured using the connector of this embodiment can be made stronger.

[0137] In the third installation step (S3), for example, as in the case of the connector 20 shown in FIG. 2A, a protrusion 21 may be provided on the first end 18A side of the joint 18.

[0138] By providing the protrusion 21, when the joint 18 is inserted into the first through-hole 161 of the female member 16, the male member 17 can be more firmly pressed between the first fixing device 15 and the first inner circumferential surface 16C of the first through-hole 161. This allows the female member 16 to be more firmly fixed to the first fixing device 15, making the connection structure stronger. (4) Connection process (S4) In the connecting step (S4), the second female thread portion 321 arranged on the inner circumferential surface of the second through hole 311 of the sleeve 31 can be fitted with the second male thread portion 184 of the joint 18. At this time, the third female thread portion 322 arranged on the inner circumferential surface of the second through hole 311 of the sleeve 31 can be fitted with the third male thread portion 333 of the second fixing tool 33.

[0139] At the start of the connecting step (S4), the sleeve 31 can be attached to the outer periphery 33A of the second fixing device 33. Then, for example, the second fixing device 33 can be positioned so that the end face of the second fixing device 33 on the end 32A side of the second PC steel member 32 is close to the second end 18B of the joint 18.

[0140] Then, by rotating the sleeve 31, the sleeve 31 is moved toward the joint 18, and the second female thread portion 321 of the sleeve 31 is fitted into the second male thread portion 184 of the joint 18, thereby fixing the second fixing device 33 to the first fixing device 15 via the connector 10. In other words, a connection structure 30 can be created that connects the first PC steel member 12 and the second PC steel member 32.

[0141] In the connecting step S4, it is preferable to displace the position of the sleeve 31 until it can no longer move forward, for example, until it comes into contact with the third end 18E of the joint 18.

[0142] In the connecting step (S4), it is preferable to connect the second fixing device 33 and the joint 18 by the sleeve 31 so that the second fixing device 33 and the joint 18 come into contact. By connecting the second fixing device 33 and the joint 18 by the sleeve 31 so that the second fixing device 33 and the joint 18 come into contact, it is possible to increase the total joint distance between the second female thread 321 and the third female thread 322 of the sleeve 31 and the second male thread 184 of the joint 18 and the third male thread 333 of the second fixing device 33. This makes it possible to achieve a particularly strong connection structure.

[0143] Therefore, in the connection step (S4), before rotating the sleeve 31, it is preferable to position the second fixing device 33 so that the end face of the second fixing device 33 facing the joint 18 contacts the second end 18B of the joint 18.

[0144] The end surface of the second fixing tool 33 also includes the presser plate 34 installed on the second fixing tool 33 and the bolt 35 that secures the presser plate 34. In FIG. 3, the second fixing tool 33 is provided with the presser plate 34 that holds down the second male cone 332, and therefore the components are arranged so that the end surface 35A of the bolt 35 that secures the presser plate 34 contacts the second end 18B of the joint 18. (5) Cap installation process The manufacturing method of the connection structure of this embodiment may also include a cap installation step of installing a cap 36 so as to cover the connector 10 as described above, as shown in FIG.

[0145] Furthermore, the manufacturing method of the connection structure of this embodiment may further include a filling step of filling a filler from either the first pipe 361 or the second pipe 362 provided on the side surface of the cap 36. The material of the filler is not particularly limited, and various fillers can be used, for example, one or more types selected from epoxy resin, pre-grout resin, wax, cement grout, asphalt, etc.

[0146] According to the manufacturing method of the connection structure of this embodiment, by installing a connector 100 on the first fixing device 15 that grips the first PC steel member 12, a connection structure can be formed even if no threads are formed on the outer surface of the first fixing device 15.

[0147] The outer diameter of the connector 10 used in the manufacturing method of the connection structure of this embodiment is largest, for example, at the female member 16. The outer diameter of the female member 16 is the sum of the outer diameter of the first fixing device 15 to be housed, the thickness of the male member 17 that secures the first fixing device 15, and the thickness of the wall portion of the female member 16, which has a wall thickness necessary to support the second PC steel member 32. Furthermore, there is no need to provide various components around the female member 16 for connecting it to other components. This allows the outer diameter of the connector 10 to be reduced, and the connection structure of this embodiment using the connector 10 can be applied to places with limited installation space, such as bridges. [Example of connection structure] 5 shows a configuration example in which the connection structure 30 of this embodiment is provided on an existing bridge to widen it, but the present invention is not limited to these configuration examples.

[0148] In Figure 5, area 51 is the existing area, which is an existing bridge. The thickness L511 of the bridge deck 511 is 45 mm, and rebars with a diameter of 13 mm extend left and right in the figure in this deck. The first anchoring device 15 that held the first PC steel member 12 with a nominal diameter of 21.8 mm installed in area 51 is installed on the side of the bridge in area 51, which is the existing area.

[0149] In FIG. 5, area 52 is the expansion area, which is the area where the bridge will be newly expanded.

[0150] When manufacturing the expansion portion, the previously described connector 100 was used for the first fixing device 15 to manufacture a connection structure 30 having a new second PC steel member 32 and a second fixing device 33. Although detailed illustration of the connection structure 30 is omitted in Figure 5, the previously described cap 36 is provided on the outer periphery, and a filler material is filled inside the cap 36.

[0151] Although the expansion section is constrained by the size of the existing bridge, the connection structure described above allows the size of the connection structure to be reduced, and it was confirmed that the connection structure can be manufactured even under the above constraints. [Explanation of symbols]

[0152] 10, 20, 100 Connectors 11 Concrete structures 12 1st PC steel material 12A end 13 Sheath 14 Bearing plate 15 First fixing device D15 Outer diameter of first fixing tool 151 First Female Cone 151A outer circumference 152 First Oscone 16 Female member 16A 1st end 16B 2nd end 16C 1st inner surface 16D 2nd inner surface 161 First through hole 161A 1st opening 1611 First area 1612 Second area D161A First opening inner diameter 161B 2nd opening D161B Second opening inner diameter 162 First female thread 163 Jig hole 17 Male member 171, 172 Male member split piece 18 joints 1811 First joint D1811 Outer diameter of first joint 1812 Second joint D1812 Outer diameter of second joint 18A 1st end 18B 2nd end 18C, 18D side 18E 3rd end 182 Through hole 183 First male thread 184 Second male thread 185 Jig hole 21 Convex part 30 Connection structure 31 Sleeve 311 Second Through Hole 311A 3rd opening 31A Inner surface 311B 4th opening 31B Inner surface 321 Second female thread 322 Third female thread 32 2nd PC steel material 32A end 33 Second fixing device 331 Second Female Cone 332 Second Oscone 33A outer circumference 333 Third male thread 34 Presser plate 341 Board part 342 Through-hole section 35 volts 35A end face 36 Cap 361 First Pipe 362 Second Pipe CA center axis S1 1st installation process S2 2nd installation process S3 3rd installation process S4 connection process 51 areas 511 Floor slab L511 Thickness 52 areas

Claims

1. A connector for connecting a first PC steel member and a second PC steel member, a female member having a first through hole capable of accommodating a first fixing tool that grips the first PC steel member; a male member configured to be insertable between the first fixing tool and an inner circumferential surface of the first through hole; a joint including a first male threaded portion on a side surface of a first end portion in the longitudinal direction and a second male threaded portion on a side surface of a second end portion located opposite the first end portion in the longitudinal direction, When the opening of the first through hole on the side where the first fixing device is inserted is defined as the first opening, the first through hole has a first female thread portion that engages with the first male thread portion on the inner surface of the second opening side located opposite the first opening.

2. 2. The connector according to claim 1, wherein the first end of the joint is configured to contact the male member when the first end side of the joint is inserted into the first through hole.

3. The connector according to claim 1 or 2, wherein the first end of the joint is provided with a protrusion.

4. The connector according to claim 1 , wherein at least one selected from the first male thread portion and the second male thread portion is colored.

5. a sleeve including a second through hole; The second through hole is a second female thread portion that is arranged on an inner circumferential surface of the second through hole on a third opening side and that mates with the second male thread portion of the joint; A connector as described in any one of claims 1 to 4, having a third female threaded portion that engages with a third male threaded portion provided on the outer periphery of a second fixing device that grips the second PC steel material, and is arranged on the inner surface of a fourth opening side located opposite the third opening of the second through hole.

6. A connection structure in which a first PC steel member and a second PC steel member are connected, The first PC steel member; The second PC steel member; a connector for connecting a first fixing device that grips the first PC steel member and a second fixing device that grips the second PC steel member, The connector comprises: a female member having a first through hole capable of accommodating the first fixing tool; a male member configured to be insertable between the first fixing tool and an inner circumferential surface of the first through hole; a joint having a first male threaded portion on a side surface of a first end portion in a longitudinal direction and a second male threaded portion on a side surface of a second end portion located opposite to the first end portion in the longitudinal direction; a sleeve including a second through hole; When an opening of the first through hole on a side into which the first fixing tool is inserted is defined as a first opening, the first through hole has a first female thread portion that fits with the first male thread portion on an inner circumferential surface on a second opening side located opposite to the first opening, The second through hole is a second female thread portion that is arranged on an inner circumferential surface of the second through hole on a third opening side and that mates with the second male thread portion of the joint; A connection structure having a third female thread portion that engages with a third male thread portion provided on the outer periphery of the second fixing device, and is arranged on the inner surface of a fourth opening side that is located opposite the third opening of the second through hole.

7. A manufacturing method of a connection structure in which a first PC steel member and a second PC steel member are connected by a connector, The connector comprises: a female member having a first through hole capable of accommodating a first fixing tool that grips the first PC steel member; a male member configured to be insertable between the first fixing tool and an inner circumferential surface of the first through hole; a joint having a first male threaded portion on a side surface of a first end portion in a longitudinal direction and a second male threaded portion on a side surface of a second end portion located opposite to the first end portion in the longitudinal direction; a sleeve including a second through hole; When an opening of the first through hole on a side into which the first fixing tool is inserted is defined as a first opening, the first through hole has a first female thread portion that fits with the first male thread portion on an inner circumferential surface on a second opening side located opposite to the first opening, The second through hole is a second female thread portion that is arranged on an inner circumferential surface of the second through hole on a third opening side and that mates with the second male thread portion of the joint; a third female thread portion that is arranged on an inner peripheral surface of the second through hole on the side of a fourth opening that is located opposite the third opening, and that engages with a third male thread portion that is provided on an outer periphery of a second fixing tool that grips the second PC steel member, The method for manufacturing the connection structure includes: a first installation step of inserting the first fixing tool, which grips the first PC steel member, into the first through hole from the first opening side of the first through hole of the female member; a second installation step of inserting a male member between the first fixing tool and an inner circumferential surface of the first through hole of the female member; a third installation step of installing the joint on the female member by inserting the first end side of the joint from the second opening side of the first through hole and screwing the first male thread portion of the joint into the first female thread portion of the first through hole; a connecting step of connecting the second fixing device and the joint by the sleeve, In the connection process, the second female threaded portion arranged on the inner surface of the second through hole of the sleeve is engaged with the second male threaded portion of the joint, and the third female threaded portion arranged on the inner surface of the second through hole of the sleeve is engaged with the third male threaded portion of the second fixing device.

8. The method for manufacturing a connection structure according to claim 7 , wherein in the third installation step, the first male threaded portion is screwed into the first female threaded portion until the first male threaded portion is no longer visible from the outside.

9. 9. The method for manufacturing a connection structure according to claim 7 or 8, wherein in the connecting step, the second fixing device and the joint are connected by the sleeve so that the second fixing device and the joint are in contact with each other.

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