Fixture installation method

Abstract

To effectively install a fixture 10.SOLUTION: A fixture installation method for installing a fixture 10 comprising a female member 12, a male member 15, and a bearing plate member 11 to one end part of a concrete structure 1A by use of a fixture installation jig 20, wherein the fixture installation jig 20 comprises a main body part 30 having a cylinder member 31, a first fixation member 40 which fixes the cylinder member 31 to the female member 12, an elastic member 50 which energizes the male member 15 toward a first through hole 13, and a second fixation member B which fixes the female member 12 to the bearing plate member 11, and the fixture installation method includes a fitting process of performing, in no particular order, work to fit the bearing plate member 11 to one end part E1 of a frame mold and work to fit the cylinder member 31 to the female member 12 with the first fixation member 40, a tension material insertion process of inserting the tension material 5 into a sheath pipe 4, and a tensile force introduction process of operating a tension device 6 to fit the male member 15 into the first through hole 13.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a fastener installation method. [Background technology]

[0002] The post-tensioning method is a conventional method for introducing prestress into concrete structures. In this method, prestress is introduced into the concrete structure by inserting tendons such as PC strands into sheath pipes embedded in concrete, installing anchors and jacks on the tendons to apply tension, and then injecting grout into the sheath pipes.

[0003] For example, Patent Document 1 discloses a jig (hereinafter referred to as a "fixer installation jig") for installing a fixing device used in a post-tensioning method. The fixing device installation jig described in Patent Document 1 includes a cylindrical housing fixed to the female cone of the fixing device, and a coil spring disposed within the internal space of the housing and biasing the male cone of the fixing device toward the female cone. The fixing device installation jig described in Patent Document 1 is configured so that when a tendon is inserted into the female cone, the male cone is pushed out of the female cone by the insertion force of the tendon and expands in diameter, and when the tendon penetrates the male cone, the coil spring pushes the male cone back toward the female cone. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-137878 Summary of the Invention [Problem to be solved by the invention]

[0005] When installing a fixture using the above-mentioned fixture installation jig, it is important to ensure that the tension material is securely inserted into and penetrates the male cone, and that the male cone that the tension material has penetrated is securely pushed back toward the female cone.

[0006] For example, if the elastic force of the coil spring is too large compared to the insertion force of the tensioning material, the male cone will not be pushed out of the female cone. If the male cone is not pushed out of the female cone, the male cone will not expand, resulting in the problem of the tensioning material not being able to be inserted into the male cone. On the other hand, if the elastic force of the coil spring is too small, the tensioning material can be easily inserted into the male cone, but the male cone will not be able to be pushed back into the female cone. If tension is applied to the tensioning material in this state, the tensioning material that has protruded the required amount from the male cone will be pulled back, or the components that make up the male cone will come apart, resulting in the problem of the fixing device not being installed correctly. In other words, to effectively install the fixing device using the above-mentioned fixing device installation jig, it is important to set the elastic force (spring constant) of the coil spring.

[0007] The technology disclosed herein has been made in consideration of the above circumstances, and aims to provide a technology that can effectively install a fixing device on a tendon. [Means for solving the problem]

[0008] The fastener installation method of the present disclosure includes: a female member (12) having a first through hole (13) through which a tendon (5) passes, a male member (15) having a second through hole (16) and capable of being fitted into the first through hole (13), and a bearing plate member (11) having an insertion hole (11A) into which the tendon (5) is inserted, the second through hole (16) being configured so that its inner diameter can be expanded to be larger than the outer diameter of the tendon (5) when at least a portion of the male member (15) is pushed out of the first through hole (13) by a predetermined amount, the method comprising: installing a fastener (10) at one end (E1) of a concrete structure (1A) constructed by a cast-in-place construction method using a fastener installation jig (20), The fixing tool installation jig (20) is a main body portion (30) having a tubular member (31) capable of receiving at least a portion of the female member (12); a first fixing member (40) provided on the cylindrical member (31) and fixing the cylindrical member (31) that receives the female member (12) to the female member (12); an elastic member (50) that is contractibly accommodated inside (34) of the tubular member (31) and that is capable of transmitting an elastic force that urges the male member (15) toward the first through hole (13) when the tubular member (31) is fixed to the female member (12); and a second fixing member (B) for fixing the female member (12) to the support plate member (11), The fastener installation method includes: an attachment work process in which, in any order, an attachment work of the support plate member (11) to which the female member (12) is fixed by the second fixing member (B) to one end (E1) of a formwork for constructing the concrete structure (1A) and an attachment work of the tubular member (31) to the female member (12) by the first fixing member (40) are performed; a tendon insertion step of inserting the tendon (5) into the sheath pipe (4) from the other end (E2) of the concrete structure (1A) after fresh concrete has been poured into the formwork, and passing the tendon (5) through the insertion hole (11A), the first through hole (13), and the second through hole (16) in this order; and a tension introducing step of operating a tensioning device (6) attached to the other end of the tensioning material (5) to introduce tension into the tensioning material (5), thereby fitting the male member (15) into the first through hole (13). It is characterized by:

[0009] The fastener installation method of the present disclosure includes: a female member (12) having a first through hole (13) through which a tendon (5) passes, a male member (15) having a second through hole (16) and capable of being fitted into the first through hole (13), and a support plate member (11) having an insertion hole (11A) into which the tendon (5) is inserted, the second through hole (16) being configured so that its inner diameter can be expanded to be larger than the outer diameter of the tendon (5) when at least a portion of the male member (15) is pushed out of the first through hole (13) by a predetermined amount, the method comprising: installing a fastener (10) at one end (E1) of a concrete structure (1B) constructed by a precast segment construction method using a fastener installation jig (20); The fixing tool installation jig (20) is a main body portion (30) having a tubular member (31) capable of receiving at least a portion of the female member (12); a first fixing member (40) provided on the cylindrical member (31) and fixing the cylindrical member (31) that receives the female member (12) to the female member (12); an elastic member (50) that is contractibly accommodated inside (34) of the tubular member (31) and that is capable of transmitting an elastic force that urges the male member (15) toward the first through hole (13) when the tubular member (31) is fixed to the female member (12); and a second fixing member (B) for fixing the female member (12) to the support plate member (11), The fastener installation method includes: an attachment work step of attaching the support plate member (11) to which the female member (12) is fixed by the second fixing member (B) to one end (E1) of a one-end precast concrete member (2A) that forms one end of the concrete structure (1B) among a plurality of precast concrete members (2A to 2C) that constitute the concrete structure (1B), and attaching the tubular member (31) to the female member (12) by the first fixing member (40); a tendon insertion process in which, after arranging the plurality of precast concrete sections (2A to 2C) at predetermined positions, the tendon (5) is inserted into the sheath tube (4) from the other end (E2) of the other end side precast concrete member (2C) that forms the other end of the concrete structure (1B), and the tendon (5) is passed through the insertion hole (11A), the first through hole (13), and the second through hole (16) in this order; and a tension introducing step of operating a tensioning device (6) attached to the other end of the tensioning material (5) to introduce tension into the tensioning material (5), thereby fitting the male member (15) into the first through hole (13). It is characterized by:

[0010] The fastener installation method of the present disclosure includes: A method for installing a fastener (10) comprising: a female member (12) having a first through hole (13) through which a tendon (5) passes; and a male member (15) having a second through hole (16) and capable of being fitted into the first through hole (13), wherein the second through hole (16) is configured so that its inner diameter can be expanded to be larger than the outer diameter of the tendon (5) when at least a portion of the male member (15) is pushed out of the first through hole (13) by a predetermined amount, at one end (E1) of a concrete structure (1A) constructed by a cast-in-place construction method, using a fastener installation jig (20), The fixing tool installation jig (20) is a main body portion (30) having a tubular member (31) capable of receiving at least a portion of the female member (12); a fixing member (40) provided on the cylindrical member (31) for fixing the cylindrical member (31) that receives the female member (12) to the female member (12); an elastic member (50) that is contractibly accommodated inside (34) of the tubular member (31) and configured to be capable of transmitting an elastic force that urges the male member (15) toward the first through hole (13) when the tubular member (31) is fixed to the female member (12), and the maximum value of the elastic force is set to an elastic force that, when the tension member (15) inserted into the first through hole (13) with a predetermined insertion force is transmitted to the male member (15) positioned in the first through hole (13), allows the male member (15) to move from the first through hole (13) until the male member (15) reaches at least the specific state, while making the amount of protrusion of the tension member (5) that has passed through the second through hole (16) from the male member (15) at least equal to the diameter of the tension member (5); The fastener installation method includes: an attachment work process in which an operation of attaching the female member (12) to one end (E1) of a formwork for constructing the concrete structure (1A) and an operation of attaching the tubular member (31) to the female member (12) using the fixing member (40) are performed in any order; a tendon insertion step of inserting the tendon (5) into the sheath pipe (4) from the other end (E2) of the concrete structure (1A) after fresh concrete has been poured into the formwork, and passing the tendon (5) through the insertion hole (11A), the first through hole (13), and the second through hole (16) in this order; and a tension introducing step of operating a tensioning device (6) attached to the other end of the tensioning material (5) to introduce tension into the tensioning material (5), thereby fitting the male member (15) into the first through hole (13). It is characterized by:

[0011] The fastener installation method of the present disclosure includes: A method for installing a fastener (10) comprising: a female member (12) having a first through hole (13) through which a tendon (5) passes; and a male member (15) having a second through hole (16) and capable of being fitted into the first through hole (13), wherein the second through hole (16) is configured so that its inner diameter can be expanded to be larger than the outer diameter of the tendon (5) when at least a portion of the male member (15) is pushed out of the first through hole (13) by a predetermined amount, at one end (E1) of a concrete structure (1B) constructed by a precast segment construction method, using a fastener installation jig (20), The fixing tool installation jig (20) is a main body portion (30) having a tubular member (31) capable of receiving at least a portion of the female member (12); a fixing member (40) provided on the cylindrical member (31) for fixing the cylindrical member (31) that receives the female member (12) to the female member (12); an elastic member (50) that is contractibly accommodated inside (34) of the tubular member (31) and configured to be capable of transmitting an elastic force that urges the male member (15) toward the first through hole (13) when the tubular member (31) is fixed to the female member (12), and the maximum value of the elastic force is set to an elastic force that, when the tension member (15) inserted into the first through hole (13) with a predetermined insertion force is transmitted to the male member (15) positioned in the first through hole (13), allows the male member (15) to move from the first through hole (13) until the male member (15) reaches at least the specific state, while making the amount of protrusion of the tension member (5) that has passed through the second through hole (16) from the male member (15) at least equal to the diameter of the tension member (5); The fastener installation method includes: an attachment work step of attaching the female member (12) to one end (E1) of a one-end precast concrete member (2A) that forms one end of the concrete structure (1B) among a plurality of precast concrete members (2A to 2C) that constitute the concrete structure (1B), and attaching the tubular member (31) to the female member (12) using the fixing member (40); a tendon insertion process in which, after arranging the plurality of precast concrete members (2A to 2C) at predetermined positions, the tendon (5) is inserted into the sheath tube (4) from the other end (E2) of the other end side precast concrete member (2C) that forms the other end of the concrete structure (1B), and the tendon (5) is passed through the insertion hole (11A), the first through hole (13), and the second through hole (16) in this order; and a tension introducing step of operating a tensioning device (6) attached to the other end of the tensioning material (5) to introduce tension into the tensioning material (5), thereby fitting the male member (15) into the first through hole (13). A method for installing a fastener.

[0012] In another aspect of the present disclosure, a fastener installation method includes: The fixing tool installation jig (20) is The tension member further includes a pressure plate member (60) that has a third through hole (61) through which the tension member (5) passes, is housed in the interior (34) of the tubular member (31) so as to be movable in the axial direction, is disposed between the male member (15) and the elastic member (50), and is configured to be able to transmit the elastic force of the elastic member (50) to the male member (15). It is desirable.

[0013] In another aspect of the present disclosure, a fastener installation method includes: The fixing tool installation jig (20-2) is a guide tube (90) that is arranged concentrically with the insertion hole (11A) and is fixed to a surface of the support plate member (11) opposite to the female member (12), and into which the tension member (5) can be inserted; The guide tube (90) is inserted into one end of the sheath tube (4) into which the tension member (5) is inserted from the other end side, and the inner surface of the end opposite to the support plate member (11) is chamfered. It is desirable.

[0014] In another aspect of the present disclosure, a fastener installation method includes: The main body (30) is provided on one end side of the cylindrical member (31) and includes a cover member (32) on which one end of the elastic member (50) is seated. The tubular member (31) is formed such that, when fixed to the female member (12), the length from one end face of the male member (15) fitted into the first through hole (13) to the inner surface of the cover member (32) is approximately equal to the diameter of the tension member (5). It is desirable.

[0015] In another aspect of the present disclosure, a fastener installation method includes: The fixing tool installation jig (20-1) is a sensor (80) provided on the cover member (32) and configured to transmit a detection signal when a tip of the tendon (5) passing through the first through hole (13) and the second through hole (16) comes into contact with the sensor; and an alarm device (85) that, upon receiving the detection signal transmitted from the sensor (80), generates light or sound to notify that the tension member (5) has been inserted to a desired position. It is desirable.

[0016] In another aspect of the present disclosure, a fastener installation method includes: The elastic member (50) is a plurality of coil springs (50-1 to 50-4), and the plurality of coil springs (50-1 to 50-4) are arranged in parallel inside the cylindrical member (34). It is desirable.

[0017] In the above description, to aid in understanding the present disclosure, the symbols used in the embodiments are added in parentheses to components corresponding to the embodiments, but each component is not limited to the embodiment defined by the symbol. [Effects of the Invention]

[0018] According to the technology of the present disclosure, the anchor can be effectively installed on the tendon. [Brief explanation of the drawings]

[0019] [Figure 1] (A) is a schematic cross-sectional view showing an example of a fastener installed in a concrete structure constructed by a cast-in-place method. (B) is a schematic cross-sectional view showing an example of a fastener installed in a concrete structure constructed by a precast segment method. [Figure 2] FIG. 2 is a schematic cross-sectional view of a fixing tool. [Figure 3] FIG. 2 is a schematic perspective view of a male cone. [Figure 4] 10A and 10B are schematic diagrams illustrating a conventional procedure for installing a fixing tool without using a fixing tool installation jig. [Figure 5] FIG. 2 is a cross-sectional view showing a schematic view of a fixing tool installation jig according to the present embodiment. [Figure 6] FIG. 2 is a schematic perspective view showing a fixing tool installation jig according to the present embodiment. [Figure 7] 10A to 10C are schematic diagrams illustrating a method for installing a fixing tool using a fixing tool installation jig according to the present embodiment. [Figure 8] 10A to 10C are schematic diagrams illustrating a method for installing a fixing tool using a fixing tool installation jig according to the present embodiment. [Figure 9] 10A to 10C are schematic diagrams illustrating a method for installing a fixing tool using a fixing tool installation jig according to the present embodiment. [Figure 10] 10A to 10C are schematic diagrams illustrating a method for installing a fixing tool using a fixing tool installation jig according to the present embodiment. [Figure 11] FIG. 10 is a flow chart illustrating a method for installing a fixing tool using the fixing tool installation jig according to the present embodiment. [Figure 12] 10 is a schematic cross-sectional view showing a fixing tool installation jig according to Modification 1. FIG. [Figure 13] FIG. 10 is a schematic cross-sectional view showing a fixing tool installation jig according to Modification 2. [Figure 14] FIG. 10 is a schematic cross-sectional view showing a fixing tool installation jig according to Modification 3. [Figure 15] 10 is a schematic diagram illustrating the arrangement of coil springs in a fixing tool installation jig according to Modification 3. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, the fastener installation method according to this embodiment will be described with reference to the accompanying drawings.

[0021] [Fixing device overview] First, before describing the fastener installation method according to this embodiment, an overview of the fastener to be installed in a concrete structure will be described.

[0022] FIG. 1(A) is a schematic cross-sectional view showing an example of a fastener 10 installed in a concrete structure 1A constructed by a cast-in-place construction method. The concrete structure 1A shown in FIG. 1(A) is constructed by pouring fresh concrete into a formwork (not shown) at a construction site. FIG. 1(B) is a schematic cross-sectional view showing an example of a fastener 10 installed in a concrete structure 1B constructed by a precast segment construction method. The concrete structure 1B shown in FIG. 1(B) is constructed by joining multiple precast concrete members 2A-2C that have been transported to the construction site. In the illustrated example, three precast concrete members 2A-2C are joined, but the number of precast concrete members may be two, four or more.

[0023] 1(A) and 1(B), a sheath pipe 4 is embedded in concrete structures 1A and 1B from one end E1 to the other end E2. In the illustrated example, the sheath pipe 4 is embedded in a straight line, but it may also be embedded in a curved line.

[0024] Tendons 5 are inserted into the sheath tubes 4 to apply prestress to the concrete structures 1A and 1B. The tendons 5 may be, for example, prestressed concrete (PC) steel wires made by twisting together multiple steel wires, or PC steel bars. To improve durability, the tendons 5 may be painted, coated, plated, or otherwise treated. One end of the tendon 5 is fixed to one end E1 of the concrete structures 1A and 1B by a fixing device 10. One end of the tendon 5 may be chamfered. A tensioning device 6, such as a hydraulic jack, is attached to the other end of the tendon 5 via the fixing device 10.

[0025] The fixing device 10 includes a bearing plate (bearing plate member) 11, a female cone (female member) 12, and a male cone (male member) 15. Specifically, as shown in FIG. 2, the bearing plate 11 is formed in a rectangular plate shape, and an insertion hole 11A is provided in the approximate center thereof, penetrating the bearing plate 11 in the plate thickness direction. A tendon 5 is inserted into the insertion hole 11A. The insertion hole 11A may be chamfered. The bearing plate 11 may be embedded in one end E1 of the concrete structures 1A, 1B in advance, or may be disposed at one end E1 of the concrete structures 1A, 1B when the fixing device 10 is installed. The bearing plate 11 is sometimes also called an anchor plate.

[0026] The female cone 12 is formed, for example, in a cylindrical shape, and has a through hole (first through hole) 13 that penetrates in the axial direction. The through hole 13 has a tapered inner circumferential surface whose hole diameter increases from the concrete structures 1A, 1B side toward the opposite side. The female cone 12 is disposed on the surface of the bearing plate 11 opposite to the concrete structures 1A, 1B so that the through hole 13 is concentric with the insertion hole 11A.

[0027] The male cone 15 is formed in a generally truncated cone shape and has a through-hole (second through-hole) 16 that penetrates in the axial direction. The tendon 5 is inserted into the through-hole 16. For example, as shown in FIG. 3, the male cone 15 is formed by combining multiple members 15A to 15C in the circumferential direction to form a generally truncated cone shape. When the members 15A to 15C are combined in the circumferential direction, the male cone 15 has a tapered outer peripheral surface that corresponds to the tapered inner peripheral surface of the through-hole 13. In other words, the male cone 15 is configured to be able to fit into the through-hole 13 of the female cone 12. The circumferentially adjacent members 15A to 15C are preferably connected by fitting ring members 17 made of resin, steel springs, or the like into grooves provided at the end portions on the enlarged diameter side. The number of members 15A to 15C that make up the male cone 15 is not limited to three as shown in the illustrated example, and may be two, four, or more.

[0028] [Conventional fixture installation procedure without using a fixture installation jig] When installing the anchoring device 10 on one end side of the tendon 5, first insert the tendon 5 into the sheath tube 4 from the other end E2 side of the concrete structures 1A, 1B (see Figures 1(A) and (B)). At this time, as shown in Figure 4(A), the tendon 5 penetrates the insertion hole 11A of the support plate 11 and is inserted until it protrudes a predetermined length from one end E1 of the concrete structures 1A, 1B. There are no particular restrictions on the amount of protrusion of the tendon 5, but it should protrude at least longer than the axial length of the female cone 12.

[0029] Once the tendon 5 has been protruded, as shown in Figure 4(B), the tendon 5 is inserted into the through hole 13 of the female cone 12, and the female cone 12 is disposed in a position where it contacts the bearing plate 11. Next, as shown in Figure 4(C), the tendon 5 is inserted into the through hole 16 of the male cone 15, and at least a part of the male cone 15 is inserted into the through hole 13 of the female cone 12.

[0030] After the male cone 15 is inserted into the through-hole 13, as shown in FIG. 4(D), a cylindrical jig 19 is placed on one end of the male cone 15, and the cylindrical jig 19 is struck with a hammer HM or the like to push the male cone 15 into the through-hole 13 of the female cone 12. In this state, the tensioning device 6 (see FIGS. 1(A) and 1(B)) attached to the other end of the tendon 5 is activated to apply tension to the tendon 5. This causes the male cone 15 to fit into the through-hole 12, which has a tapered inner circumferential surface of the female cone 12, completing the installation of the fixing device 10. One end of the tendon 5 protrudes a predetermined amount from the male cone 15 while fixed by the fixing device 10. Hereinafter, the length of the portion of the tendon 5 protruding from the male cone 15 is referred to as the excess length LE (see FIG. 4(D)). It is desirable that the excess length LE be approximately equal to the diameter of the tendon 5.

[0031] Here, as shown by the dashed lines in Figures 1(A) and 1(B), consider a case where there is an obstacle OB such as an existing concrete structure on one end E1 side of the concrete structures 1A and 1B (i.e., on the back side of the fixing device 10), making it impossible to secure sufficient working space.

[0032] In the installation work of the conventional fixing tool 10, it is necessary to strike the male cone 15 with a hammer HM or the like while the cylindrical jig 19 is in contact with the male cone 15 (see FIG. 4(D)). Therefore, if there is not enough working space available on the back side of the fixing tool 10, it is not possible to insert the cylindrical jig 19 or swing the hammer HM, which creates the problem of not being able to push the male cone 15 into the female cone 12.

[0033] Furthermore, in the installation work of the conventional fastener 10, it is necessary to insert the tension member 5 into the female cone 12 and hold the female cone 12 in a position where it contacts the bearing plate 11 (see FIG. 4(B)). Since such holding of the female cone 12 is usually performed by a worker's hand, the fastener 10 cannot be installed if the worker cannot reach it. Even if the worker can reach it, it is difficult to continuously hold the female cone 12 in the desired position or to evenly press each of the members 15A to 15C of the male cone 15 into the female cone 12, which creates the problem of not being able to install the fastener 10 correctly.

[0034] The fixture installation jig and the fixture installation method according to this embodiment solve these problems. The fixture installation jig will be described in detail below.

[0035] [Fixing fixture installation jig] Fig. 5 is a schematic cross-sectional view showing the fixing tool installation jig 20 according to this embodiment. Fig. 6 is a schematic perspective view showing the fixing tool installation jig 20 according to this embodiment.

[0036] As shown in Figures 5 and 6, the fixing tool installation jig 20 mainly comprises a main body 30, a fixing member (first fixing member) 40, a coil spring (elastic member) 50, a pressure plate (pressure plate member) 60, and a regulating member 70.

[0037] The main body 30 is formed in a cylindrical shape with one end closed and the other end open, and includes a tubular member 31 and a cover member 32. The material of the main body 30 is preferably metal, and examples of materials that can be used include steel, stainless steel, and aluminum, or a combination of multiple materials. The shape of the tubular member 31 may be cylindrical, as shown in the illustration, or may be a rectangular tube. There are no particular restrictions on the thickness of the main body 30, but it is desirable that the wall thickness of the main body 30 be rigid enough to prevent deformation when the tension member 5 contacts the cover member 32 with a predetermined insertion force.

[0038] The coil spring 50, the pressure plate 60, etc. are housed in the internal space 34 defined by the cylindrical member 31 and the inner surface of the cover member 32. The shape of the internal space 34 is not particularly limited as long as it can house the coil spring 50 and the pressure plate 60. The cylindrical member 31 is preferably provided with a plurality of windows 33 (shown in FIG. 6) at predetermined intervals in the circumferential direction.

[0039] The main body portion 30 is fixed to the fixing device 10 by receiving a part of the female cone 12 inside the cylindrical member 31. For this reason, the inner diameter of the cylindrical member 31 is formed larger than the outer diameter of the female cone 12. Hereinafter, the part of the cylindrical member 31 that receives the female cone 12 will be referred to as the fixed cylindrical portion 36. Furthermore, the part of the cylindrical member 31 other than the fixed cylindrical portion 36, i.e., the part that receives the coil spring 50 and the pressure plate 60, will be referred to as the receiving cylindrical portion 37.

[0040] The fixing member 40 fixes the main body portion 30 to the female cone 12 of the fixing device 10. The fixing member 40 is preferably a male screw that screws into a female threaded hole that penetrates the tubular member 31 of the main body portion 30, and detachably fixes the main body portion 30 to the female cone 12. The fixing member 40 is provided on the open end side of the tubular member 31, i.e., on the fixed tubular portion 36. The shape of the male screw is not particularly limited, but it is desirable for the screw head exposed to the outside of the fixed tubular portion 36 to have a tool hole such as a hexagonal socket, a Phillips groove, a flathead groove, etc. The number of fixing members 40 is also not particularly limited, but it is desirable to provide at least three fixing members 40 (four evenly spaced in the illustrated example) at predetermined intervals around the circumferential direction of the fixed tubular portion 36 so that the main body portion 30 fixed to the female cone 12 does not move radially. When the fixing member 40 is tightened, the main body portion 30 can be fixed to the female cone 12, and when the fixing member 40 is loosened, the main body portion 30 can be removed from the female cone 12.

[0041] The fixing members 40 may be provided with a clamp lever 41. It is not necessary for all fixing members 40 to be provided with the clamp lever 41; only some of the fixing members 40 may be provided with the clamp lever 41. In the example shown in FIG. 6, of the four fixing members 40, two adjacent fixing members 40 are provided with the clamp lever 41. When the fixing tool installation jig 20 is installed in a location where the working space (the space behind the fixing tool 10) is narrow, it is desirable to install the fixing tool installation jig 20 with the clamp lever 41 facing in a direction that allows a worker to reach in. When installed in this manner, the fixing tool installation jig 20 can be easily removed by turning the clamp lever 41 to loosen the two fixing members 40.

[0042] The coil spring 50 is accommodated in the internal space 34 of the main body 30 so as to be able to contract. Specifically, one end of the coil spring 50 abuts against the inner surface of the cover member 32 of the main body 30. The inner surface of the cover member 32 is preferably provided with a generally cylindrical protrusion 32A that protrudes toward the internal space 34. The outer diameter of the protrusion 32A is smaller than the inner diameter of the coil spring 50. The coil spring 50 is stably seated on the inner surface of the cover member 32 by receiving the protrusion 32A on its one end side. The outer diameter of the coil spring 50 is smaller than the inner diameter of the tubular member 31 so that the coil spring 50 can be accommodated in the internal space 34. Furthermore, a tension member 5 is inserted into the coil spring 50. For this reason, the inner diameter of the coil spring 50 is larger than the outer diameter of the tension member 5.

[0043] In this embodiment, the tension member 5 is inserted until one end (tip) thereof abuts against the inner surface of the protrusion 32A of the cover member 32. It is desirable that the amount by which the tension member 5 protrudes from the male cone 15, i.e., the slack length LE of the tension member 5 (see FIG. 4(D)), be approximately the same as the diameter of the tension member 5. For this reason, the main body 30 is formed so that, with the fixed tubular portion 36 fixed to the female cone 12, the length L from one end face of the male cone 15 inserted into the through hole 13 to the inner surface of the protrusion 32A is at least approximately equal to the diameter of the tension member 5. With this configuration, simply by inserting the tension member 5 until it abuts against the protrusion 32A, the slack length LE can be easily adjusted to a desired length that is approximately equal to the diameter of the tension member 5. Furthermore, by making the main body 30 the minimum necessary size to set the excess length LE of the tension member 5 to the desired length, it becomes possible to effectively install the fixing device 10 using the fixing device installation jig 20 even in a narrow space where there are obstacles or the like on the back side of the fixing device 10. The lower limit of the space in which the fixing device 10 can be set is the sum of the axial length of the female cone 12, the axial length of the accommodating tube portion 37, and the thickness of the cover member 32.

[0044] The other end of the coil spring 50 contacts the surface of the pressing plate 60 facing the internal space 34. It is preferable that the surface of the pressing plate 60 facing the internal space 34 be provided with a generally cylindrical protrusion 60A that protrudes toward the internal space 34. The outer diameter of the protrusion 60A is smaller than the inner diameter of the coil spring 50. The coil spring 50 is stably seated on the pressing plate 60 by receiving the protrusion 60A on its other end side. Note that, although the present embodiment uses the coil spring 50 as the elastic member, it is also possible to use other members, such as a leaf spring, as long as they can transmit an elastic force that urges the male cone 15 toward the female cone 12.

[0045] The pressure plate 60 functions to transmit the elastic force of the coil spring 50 evenly to the male cone 15. The pressure plate 60 is preferably made of a metal, such as steel, stainless steel, or aluminum. The pressure plate 60 is an annular plate material, and has a through hole 61 at its center. The tension member 5 is inserted into the through hole 61. For this reason, the inner diameter of the through hole 61 is larger than the outer diameter of the tension member 5. The inner diameter of the through hole 61 is also smaller than the outer diameter of the coil spring 50 so that the other end of the coil spring 50 is seated on the pressure plate 60.

[0046] The restricting member 70 functions to restrict the pressure plate 60 from moving toward the open end of the main body 30 due to the elastic force of the coil spring 50. By providing such a restricting member 70, the position of the pressure plate 60 is stabilized. The restricting member 70 is provided in the accommodating tubular portion 37 of the tubular member 31.

[0047] The restricting member 70 is not particularly limited as long as it has a configuration that can restrict the movement of the pressing plate 60. For example, a male screw can be used as the restricting member 70. Specifically, a female screw hole that penetrates the tubular housing portion 37 can be provided in the tubular housing portion 37, and a male screw inserted into the female screw hole can serve as the restricting member 70. In this case, the male screw restricting member 70 can be made to protrude from the female screw hole into the inside of the tubular housing portion 37. If the restricting member 70 is a male screw, the pressing plate 60 and the coil spring 50 can be easily removed from the main body portion 30 by loosening the male screw, and these can also be replaced.

[0048] When the restricting member 70 is a male screw, it is desirable that the male screw has a tool hole such as a hexagonal hole, a Phillips groove, a flat-head groove, or the like in the head of the screw exposed to the outside from the casing cylindrical portion 37, similar to the fixing member 40 described above. There is no particular limitation on the number of restricting members 70, but it is desirable to provide at least three restricting members 70 at predetermined intervals around the circumferential direction of the casing cylindrical portion 37 so that the movement of the pressing plate 60 can be stably restricted. In this embodiment, four restricting members 70 are arranged at equal intervals around the circumferential direction.

[0049] [Fixing fixture installation method] Next, a method for installing the fixing device 10 using the fixing device installation jig 20 according to this embodiment will be described with reference to Figures 7 to 11. Below, an installation method will be described as an example when sufficient working space cannot be secured on one end E1 side of the concrete structures 1A, 1B (i.e., on the back side of the fixing device 10).

[0050] <Installation process: S100 in Figure 11> 7, when an obstacle OB such as another concrete structure is adjacent to one end E1 of concrete structures 1A, 1B, it is difficult for workers to insert their hands into the narrow space between one end 1E of these concrete structures 1A, 1B and the obstacle OB to perform work. In this embodiment, to enable installation of fixing device 10 even in such a narrow space, fixing device 10 and fixing device installation jig 20 are attached in advance to one end 1E of concrete structures 1A, 1B.

[0051] Specifically, the female cone 12 is fixed to the support plate 11 with a bolt B (second fixing member), and the support plate 11 integrated with the female cone 12 is embedded in advance in one end 1E of the concrete structures 1A, 1B. The bolt B is inserted into a bolt insertion hole provided in the support plate 11 and screwed into a female threaded hole provided in the end of the female cone 12.

[0052] In the case of concrete structure 1A constructed by the cast-in-place method, fresh concrete can be poured into the formwork after the bearing plate 11 with the female cone 12 fixed thereto is attached to the formwork and the fastener installation jig 20 is attached to the female cone 12. The order of the work of fixing the female cone 12 to the bearing plate 11 and the work of attaching the fastener installation jig 20 to the female cone 12 can be any.

[0053] In the case of a concrete structure 1B constructed using the precast segment construction method, a bearing plate 11 with a female cone 12 fixed thereto can be embedded in one end of the precast concrete member 2A (the precast concrete member at one end) when the member is manufactured in a factory. Alternatively, the bearing plate 11 with the female cone 12 fixed thereto by bolt B can be installed after the concrete in the precast concrete member 2A has hardened. In this case, the bolt B is countersunk so that it does not protrude from the bearing plate 11, and the bearing plate 11 is received in a recess provided at the end of the precast concrete member 2A, and the bearing plate 11 is fixed to the precast concrete member 2A by bolts or the like. The fastener installation jig 20 can be attached to the female cone 12 in the factory, or after transportation to the construction site and before the precast concrete members 2A-2C are placed in their desired positions.

[0054] <Tendon Insertion Process: S200 in Figure 11> Once the anchoring device 10 and the anchoring device installation jig 20 have been attached to one end 1E of the concrete structures 1A, 1B, as shown in Figure 8, the tendon 5 is inserted into the insertion hole 11A of the bearing plate 11 and reaches the male cone 15. The inner diameter of the through hole 16 of the male cone 15 is smaller than the outer diameter of the tendon 5 when the male cone 15 is inserted into the through hole 13 of the female cone 12. Therefore, when the tendon 5 reaches the male cone 15, the insertion force of the tendon 5 causes the male cone 15 to move against the elastic force of the coil spring 50.

[0055] As shown in Figure 9, when the pressure plate 60 is pressed by the male cone 15, the coil spring 50 is compressed. As the coil spring 50 is compressed, the elastic force of the coil spring 50 and the insertion force of the tension member 5 become approximately equal, and the extrusion movement of the male cone 15 stops. When the male cone 15 reaches an inserted state (a specific state of the present disclosure) in which it is extruded a predetermined amount from the through hole 13 of the female cone 12, the inner diameter of the through hole 16 of the male cone 15 becomes more likely to expand. If the insertion of the tension member 5 continues in this state, the tension member 5 can easily pass through the male cone 15.

[0056] As shown in Figure 10, when the tension member 5 penetrates the male cone 15 and the pressure plate 60 and one end of the tension member 5 abuts against the protrusion 32A of the cover portion 32, the insertion of the tension member 5 is stopped. When the insertion of the tension member 5 is stopped, the male cone 15 is pushed back by the elastic force of the coil spring 50 transmitted via the pressure plate 60. In other words, the male cone 15 is inserted to some extent into the through-hole 13 of the female cone 12.

[0057] <Tensioning step: S300 in Figure 11> Once the male cone 15 has been inserted into the through-hole 13 of the female cone 12, the anchor installation jig 20 attached to the anchor 10 is retrieved by turning the clamp lever 41 to loosen the fixing member 40. Once the anchor installation jig 20 has been retrieved, the tensioning device 6 (see Figures 1(A) and (B)) attached to the other end of the tendon 5 is activated to apply tension to the tendon 5. This causes the male cone 15 to fit into the through-hole 13 of the female cone 12, completing the installation of the anchor 10. Once the anchor 10 has been installed, grout is injected into the sheath pipe 4 to secure the tendon 5 in place. Note that the anchor installation jig 20 does not necessarily have to be retrieved and may be left attached to the anchor 10.

[0058] To reliably install the fastener 10 using the fastener installation jig 20 of this embodiment, it is important to set the spring constant K, i.e., the elastic force, of the coil spring 50. For example, if the elastic force of the coil spring 50 is too large relative to the insertion force of the tension member 5, the coil spring 50 will be difficult to compress. When the coil spring 50 is difficult to compress, the male cone 15 will not be able to move to the state shown in FIG. 9 . That is, the male cone 15 will not be sufficiently pushed out of the female cone 12, making it difficult for the through hole 16 of the male cone 15 to expand in diameter, resulting in the problem of the tension member 5 not being able to pass through the male cone 15. On the other hand, if the elastic force of the coil spring 50 is too small relative to the frictional force, etc., generated between the through hole 16 of the male cone 15 and the outer surface of the tension member 5, the coil spring 50 will be difficult to restore its original shape. When the coil spring 50 is difficult to restore its original shape, the male cone 15 will not be able to move to the state shown in FIG. 10 . That is, the male cone 15 will not be pushed back into the through hole 13 of the female cone 12. In this state, if tension is applied to the tension member 5, the tension member 5 will be pulled out of the male cone 15, making it impossible to secure the desired excess length LE, or the components 15A to 15C will come apart, making it impossible to install the fixing device 10 correctly.

[0059] In this embodiment, the maximum value of the elastic force of the coil spring 50 is set based on an elastic force that allows the male cone 15 to move when the insertion force of the tendon 5 inserted into the through hole 13 is transmitted to the male cone 15, at least until the male cone 15 reaches an inserted state in which it is pushed out of the through hole 13 by a predetermined amount (i.e., a state in which the through hole 16 is easily enlarged), while making the amount of protrusion (i.e., excess length LE) of the tendon 5 that has passed through the through hole 16 from the male cone 15 at least approximately equal to the diameter of the tendon 5. When the insertion work is performed manually by an operator, the insertion force of a typical operator may be used as the basis, and when a device such as a wire feeding machine is used, the feeding force of the device may be used as the basis. Furthermore, the minimum value of the elastic force of the coil spring 50 is set based on the elastic force that can push the male cone 15 back toward the female cone 12 against the frictional force generated between the inner circumferential surface of the through hole 16 and the outer circumferential surface of the tension member 5 when the tension member 5 penetrates the male cone 15 and the insertion force of the tension member 5 is no longer transmitted to the male cone 15. The frictional force can be found by conducting experiments, simulations, etc. depending on the type of tension member 5.

[0060] That is, the fastener installation jig 20 according to this embodiment is configured so that, while the tendon 5 is being inserted, the male cone 15 is reliably pushed out of the female cone 12 by the insertion force of the tendon 5 to expand its diameter, and after the tendon 5 is inserted, the male cone 15 is reliably pushed back toward the female cone 12 by the elastic force of the coil spring 50. This reliably prevents the fastener 10 from being installed in a state where the tendon 5 does not penetrate the male cone 15 or where the male cone 15 is not pushed back into the through-hole 13 of the female cone 12. In other words, the fastener 10 can be properly installed on one end side of the tendon 5 simply by inserting the tendon 5 into the sheath tube 4 from the other end E2 side of the concrete structures 1A, 1B.

[0061] Furthermore, according to the fastener installation method using the fastener installation jig 20 of this embodiment, the fastener 10 and the fastener installation jig 20 are attached to one end E1 of the concrete structures 1A and 1B in advance. Then, the tendon 5 is inserted into the sheath tube 4 from the other end E2 of the concrete structures 1A and 1B. After that, the tensioning device 6 is activated to apply tension to the tendon 5. This allows the fastener 10 to be properly installed on one end of the tendon 5. In other words, installation of the fastener 10 can be completed solely by working on the other end E2 of the concrete structures 1A and 1B. This allows the fastener 10 to be reliably installed even when sufficient work space is not available on the one end E1 side (the back side of the fastener 10) of the concrete structures 1A and 1B. Furthermore, since work in a narrow space is not required, it is possible to reliably improve workability while shortening the construction period and reducing the number of workers required.

[0062] The present disclosure is not limited to the above-described embodiments, and can be appropriately modified and implemented within the scope of the present disclosure.

[0063] [Variation 1] 12 is a schematic cross-sectional view showing a fastener installation jig 20-1 according to Modification 1. Modification 1 is provided with a detection means for detecting whether the tension member 5 has passed through the through-hole 16 of the male cone 15 and been securely inserted to the desired insertion position. Specifically, the fastener installation jig 20-1 according to Modification 1 includes a touch sensor 80 (the sensor of the present disclosure) and a light-emitting unit 85 (the notification device of the present disclosure).

[0064] The touch sensor 80 has a male thread on the sensor body 81. The touch sensor 80 is attached by screwing the sensor body 81 into a female threaded hole provided in the lid portion 32 of the main body 30. A sensor portion 82 is provided at the tip of the sensor body 81. The touch sensor 80 is attached to the lid portion 32 so that the sensor portion 82 protrudes slightly toward the internal space 34 beyond the inner surface of the convex portion 32A. When the tip of the tension member 5 that has passed through the male cone 15 abuts against the sensor portion 82, the touch sensor 80 transmits a detection signal to the light-emitting portion 85 via the cable 86. Note that the connection between the touch sensor 80 and the light-emitting portion 85 is not limited to a wired connection using the cable 86, and may be a wireless connection.

[0065] The light-emitting unit 85 includes a light-emitting element such as an LED (Light Emitting Diode). The power source for the light-emitting unit 85 may be a storage battery (not shown), or may be power generated by a generator or the like on-site. The light-emitting unit 85 emits light when it receives a detection signal from the touch sensor 80.

[0066] According to the fastener installation jig 20-1 of the first modification, when the tendon 5 penetrates the male cone 15 and comes into contact with the sensor portion 82 of the touch sensor 80, the light-emitting portion 85 emits light. That is, on-site workers can easily determine whether the tendon 5 has been inserted and protruded from the male cone 15 by the required amount of surplus length LE by looking at the light-emitting portion 85, without having to directly see the fastener 10 arranged in a narrow space. This makes it possible to more reliably install the fastener 10 even in a narrow space, and also improves workability.

[0067] The method of notifying the worker of the insertion of the tension member 5 is not limited to the light emitted by the light-emitting unit 85, but sound from a speaker or the like can also be used. Also, instead of the touch sensor 80, it is possible to provide an odorant or the like on the protrusion 32A of the lid 32, which will scatter odorous particles when the tension member 5 comes into contact with it.

[0068] [Variation 2] 13 is a schematic cross-sectional view showing a fixing device installation jig 20-2 according to Modification 2. Modification 2 has a guide tube 90 provided at the end of the sheath tube 4 on the support plate 11 side for guiding the tension member 5 into the insertion hole 11A of the support plate 11.

[0069] The guide tube 90 has an outer diameter smaller than the inner diameter of the sheath tube 4, and is housed inside the sheath tube 4. One end of the guide tube 90 is preferably fixed to the support plate 11 by welding or the like. The guide tube 90 has an inner diameter larger than the outer diameter of the tendon 5. The tendon 5 can be inserted inside the guide tube 90.

[0070] The other end of the guide tube 90 is provided with a tapered surface 91 that expands in diameter toward the other end. The tip of the tendon 5 is chamfered. That is, when the tip of the tendon 5 reaches the guide tube 90, the chamfered portion at the tip of the tendon 5 comes into contact with the tapered surface 91. This effectively prevents the tendon 5 from hitting the edge of the guide tube 90 and becoming unable to be inserted.

[0071] The guide tube 90 is fixed to the support plate 11 so as to be concentric with the insertion hole 11A. In other words, the axis of the sheath tube 4 and the axis of the insertion hole 11A are configured to approximately coincide with each other. As a result, the fixing device installation jig 20-2 of modified example 2 effectively prevents misalignment of the axis when inserting the tendon 5, making it possible to easily insert the tendon 5 into the insertion hole 11A.

[0072] [Variation 3] Fig. 14 is a schematic cross-sectional view showing a fixing tool installation jig 20-3 according to Modification 3. Fig. 15 is a schematic diagram illustrating the arrangement of coil springs in fixing tool installation jig 20-3 according to Modification 3. Modification 3 has a plurality of coil springs arranged in parallel as elastic members. The number of coil springs is not particularly limited, but in the illustrated example, four coil springs 50-1 to 50-4 are provided.

[0073] The four coil springs 50-1 to 50-4 are arranged at equal intervals in the circumferential direction inside the main body 30. The spring constants k1 to k4 of the coil springs 50-1 to 50-4 are preferably set so that the sum of the spring constants k1 to k4 of the coil springs 50-1 to 50-4 is approximately equal to the spring constant K of the coil spring 50 (k1 + k2 + k3 + k4 ≈ K). That is, as in the above embodiment, the male cone 15 is reliably pushed out from the female cone 12 by the insertion force of the tension member 5 to expand its diameter while the tension member 5 is being inserted, and after the tension member 5 is inserted, the male cone 15 is reliably pushed back toward the female cone 12 by the elastic force of the coil springs 50-1 to 50-4.

[0074] As a result, the fastener installation jig 20-3 of Modification 3 can reliably prevent the fastener 10 from being installed when the tendon 5 is not inserted into the male cone 15 or when the male cone 15 is not pushed back into the female cone 12. In other words, the fastener 10 can be correctly installed on one end side of the tendon 5 simply by inserting the tendon 5 into the sheath tube 4 from the other end E2 side of the concrete structures 1A, 1B. Furthermore, by arranging multiple coil springs 50-1 to 50-4 in parallel, the elastic force of each coil spring 50-1 to 50-4 is distributed and transmitted to the male cone 15 via the pressing plate 60, and it becomes possible to approximately evenly press each member 15A to 15C of the male cone 15 into the through hole 16 of the female cone. [Explanation of symbols]

[0075] 1A, 1B... concrete structure, E1... one end, E2... other end, 2A to 2C... precast concrete member, 4... sheath pipe, 5... tension member, 6... tensioning device, 10... anchoring tool, 11... bearing plate, 11A... insertion hole, 12... female cone, 13... through hole, 15... male cone, 16... through hole, 17... ring member, 20, 20-1, 20-2, 20-3... anchoring tool installation jig, 30... main body, 31... cylindrical member, 32 ...Cover member, 32A...protrusion, 33...window portion, 34...internal space, 36...fixed cylindrical portion, 37...accommodating cylindrical portion, 40...fixing member, 41...clamp lever, 50, 50-1, 50-2, 50-3, 50-4...coil spring, 60...pressure plate, 60A...protrusion, 70...regulating member, B...bolt, 80...touch sensor, 81...sensor main body, 82...sensor portion, 85...light emitting portion, 86...cable, 90...guide tube, 91...tapered surface

Claims

1. a female member having a first through hole for passing a tendon therethrough, a male member having a second through hole and capable of being fitted into the first through hole, and a bearing plate member having an insertion hole into which the tendon is inserted, wherein the second through hole is configured so that its inner diameter can be expanded to be larger than the outer diameter of the tendon when at least a portion of the male member is pushed out of the first through hole by a predetermined amount, the method comprising: installing a fastener at one end of a concrete structure constructed by a cast-in-place method using a fastener installation jig; The fixing tool installation jig is a main body portion having a tubular member capable of receiving at least a portion of the female member; a first fixing member provided on the cylindrical member and configured to fix the cylindrical member, which receives the female member, to the female member; an elastic member that is accommodated in the tubular member in a contractible manner and that is capable of transmitting an elastic force that urges the male member toward the first through hole when the tubular member is fixed to the female member; a second fixing member for fixing the female member to the support plate member, The fastener installation method includes: an attachment work process in which, in any order, an operation of attaching the support plate member to which the female member is fixed by the second fixing member to one end of a formwork for constructing the concrete structure and an operation of attaching the tubular member to the female member by the first fixing member are performed; a tendon insertion step of inserting the tendon into a sheath pipe from the other end of the concrete structure after fresh concrete has been poured into the formwork, and passing the tendon through the insertion hole, the first through hole, and the second through hole in this order; and a tensioning force introducing step of operating a tensioning device attached to the other end side of the tensioning material to introduce tension into the tensioning material, thereby fitting the male member into the first through hole. A method for installing a fastener.

2. a female member having a first through hole for passing a tendon therethrough, a male member having a second through hole and capable of being fitted into the first through hole, and a bearing plate member having an insertion hole into which the tendon is inserted, wherein the second through hole is configured so that its inner diameter can be expanded to be larger than the outer diameter of the tendon when at least a portion of the male member is pushed out of the first through hole by a predetermined amount, the method comprising: installing a fastener at one end of a concrete structure constructed by a precast segment construction method using a fastener installation jig; The fixing tool installation jig is a main body portion having a tubular member capable of receiving at least a portion of the female member; a first fixing member provided on the cylindrical member and configured to fix the cylindrical member, which receives the female member, to the female member; an elastic member that is accommodated in the tubular member in a contractible manner and that is capable of transmitting an elastic force that urges the male member toward the first through hole when the tubular member is fixed to the female member; a second fixing member for fixing the female member to the support plate member, The fastener installation method includes: an attachment work process in which the bearing plate member, to which the female member is fixed by the second fixing member, is attached to one end of one end side precast concrete member that forms one end of the concrete structure out of the plurality of precast concrete members that make up the concrete structure, and the tubular member is attached to the female member by the first fixing member; a tendon insertion process in which, after arranging the plurality of precast concrete members in predetermined positions, the tendon is inserted into a sheath tube from the other end of the other end precast concrete member that forms the other end of the concrete structure, and the tendon is passed through the insertion hole, the first through hole, and the second through hole in that order; and a tensioning force introducing step of operating a tensioning device attached to the other end side of the tensioning material to introduce tension into the tensioning material, thereby fitting the male member into the first through hole. A method for installing a fastener.

3. A method for installing a fastener comprising: a female member having a first through hole through which a tendon passes; and a male member having a second through hole and capable of being fitted into the first through hole, wherein the second through hole is configured so that its inner diameter can be expanded to be larger than the outer diameter of the tendon when at least a portion of the male member is pushed out of the first through hole by a predetermined amount, at one end of a concrete structure constructed by a cast-in-place method, using a fastener installation jig, The fixing tool installation jig is a main body portion having a tubular member capable of receiving at least a portion of the female member; a fixing member provided on the cylindrical member and configured to fix the cylindrical member, which receives the female member, to the female member; an elastic member that is contractibly accommodated inside the tubular member and configured to be able to transmit an elastic force that urges the male member toward the first through hole when the tubular member is fixed to the female member, and the maximum value of the elastic force is set to an elastic force that, when the tension member inserted into the first through hole with a predetermined insertion force is transmitted to the male member positioned in the first through hole, allows the male member to move from the first through hole until the male member reaches at least the specific state, while making the amount of protrusion of the tension member that has passed through the second through hole from the male member at least equal to the diameter of the tension member, The fastener installation method includes: an attachment work process in which an operation of attaching the female member to one end of a form for constructing the concrete structure and an operation of attaching the tubular member to the female member using the fixing member are performed in any order; a tendon insertion step of inserting the tendon into a sheath pipe from the other end of the concrete structure after fresh concrete has been poured into the formwork, and passing the tendon through the insertion hole, the first through hole, and the second through hole in this order; and a tensioning force introducing step of operating a tensioning device attached to the other end side of the tensioning material to introduce tension into the tensioning material, thereby fitting the male member into the first through hole. A method for installing a fastener.

4. A method for installing a fastener comprising: a female member having a first through hole through which a tendon passes; and a male member having a second through hole and capable of being fitted into the first through hole, wherein the second through hole is configured so that its inner diameter can be expanded to be larger than the outer diameter of the tendon when at least a portion of the male member is pushed out of the first through hole by a predetermined amount, at one end of a concrete structure constructed by a precast segment construction method, using a fastener installation jig; The fixing tool installation jig is a main body portion having a tubular member capable of receiving at least a portion of the female member; a fixing member provided on the cylindrical member and configured to fix the cylindrical member, which receives the female member, to the female member; an elastic member that is contractibly accommodated inside the tubular member and configured to be able to transmit an elastic force that urges the male member toward the first through hole when the tubular member is fixed to the female member, and the maximum value of the elastic force is set to an elastic force that, when the tension member inserted into the first through hole with a predetermined insertion force is transmitted to the male member positioned in the first through hole, allows the male member to move from the first through hole until the male member reaches at least the specific state, while making the amount of protrusion of the tension member that has passed through the second through hole from the male member at least equal to the diameter of the tension member, The fastener installation method includes: an attachment work process in which the female member is attached to one end of a precast concrete member that forms one end of the concrete structure among a plurality of precast concrete members that constitute the concrete structure, and the tubular member is attached to the female member using the fixing member; a tendon insertion process in which, after arranging the plurality of precast concrete members in predetermined positions, the tendon is inserted into a sheath tube from the other end of the other end precast concrete member that forms the other end of the concrete structure, and the tendon is passed through the insertion hole, the first through hole, and the second through hole in that order; and a tensioning force introducing step of operating a tensioning device attached to the other end side of the tensioning material to introduce tension into the tensioning material, thereby fitting the male member into the first through hole. A method for installing a fastener.

5. The fastener installation method according to claim 1 or 2, The fixing tool installation jig is The tensioner further includes a pressure plate member that has a third through hole through which the tension member passes, is accommodated inside the tubular member so as to be movable in the axial direction, and is disposed between the male member and the elastic member so as to be able to transmit the elastic force of the elastic member to the male member. A method for installing a fastener.

6. The fastener installation method according to claim 1 or 2, The fixing tool installation jig is a guide tube, which is arranged concentrically with the insertion hole and fixed to a surface of the support plate member opposite the female member, and into which the tension member can be inserted; The guide tube is inserted into one end of the sheath tube into which the tension member is inserted from the other end side, and the inner surface of the end opposite to the support plate member is chamfered. A method for installing a fastener.

7. The fastener installation method according to claim 1 or 2, the main body portion is provided on one end side of the cylindrical member and includes a cover member on which one end of the elastic member is seated, The tubular member is formed so that, when fixed to the female member, the length from one end surface of the male member inserted into the first through hole to the inner surface of the cover member is approximately equal to the diameter of the tendon. A method for installing a fastener.

8. The fastener installation method according to claim 1 or 2, The fixing tool installation jig is a sensor provided on the cover member, the sensor transmitting a detection signal when a tip of the tendon passing through the first through hole and the second through hole comes into contact with the tendon; and an alarm device that, upon receiving the detection signal transmitted from the sensor, generates light or sound to notify that the tension member has been inserted to a desired position. A method for installing a fastener.

9. The fastener installation method according to claim 1 or 2, The elastic member is a plurality of coil springs, and the plurality of coil springs are arranged in parallel inside the cylindrical member. A method for installing a fastener.

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