Push-in jig, and installation method of anchorage device

Abstract

To effectively push a male member into a female member.SOLUTION: An anchorage device 10 comprises: a female member 12 having a first through hole 13 through which a tension member 5 penetrates; and a male member 15 having a second through hole 16 through which the tension member 5 penetrates and which holds the tension member 5 by being pushed into the first through hole 13. A jig 20 is used to push the male member 15 into the first through hole 13 when installing the anchorage device 10 in an opposing space S between an end E1 of a structure 1 and an immovable object OB. The jig 20 comprises a wedge member 30 formed in a wedge shape that becomes thinner towards a tip side and having a tapered surface 31. When the wedge member 30 is inserted into the opposing space S from its tip side with the tapered surface 31 facing the male member 15, the tapered surface 31 transmits a force in a pushing direction to the male member 15, while one surface 32 at the immovable object OB side receives a reaction force from the immovable object OB, to push the male member 15 into the first through hole 13.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a pressing jig and a method for installing a fixing tool, and to a technique suitable for pressing a male cone (male member) of a fixing tool into a female cone (female member). [Background technology]

[0002] The post-tensioning method is a conventional method for introducing prestress into concrete structures. In this method, tendons such as PC strands are inserted into sheath pipes embedded in concrete, and anchors and jacks are installed on the tendons to apply tension to introduce prestress. After that, grout is injected into the sheath pipes to secure the tendons in place.

[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] Typically, the installation of a fastener is performed by attaching a male cone to the tip of a tension member through which a female cone has passed, and then striking the male cone with a hammer or the like to push the male cone into the female cone. However, if there is an obstacle behind the fastener and sufficient working space is not available, it is not possible to strike the male cone, resulting in the problem of not being able to install the fastener correctly. While the fastener installation jig described in Patent Document 1 can be used, it must be installed in a narrow space, which requires effort and time. Another problem is that it cannot be used in spaces that are too small to fit the fastener installation jig.

[0006] The technology of the present disclosure has been made in consideration of the above circumstances, and aims to provide a technology that can effectively push a male member (male cone) of a fixing tool into a female member (female cone). [Means for solving the problem]

[0007] The pushing jig (20) of the present disclosure includes: a jig (20) used to push the male member (15) into the first through hole (13) when installing a fixing device (10) in an opposing space (S) between an end (E1) of the structure (1) and an immovable object (OB), the fixing device (10) comprising: a female member (12) having a first through hole (13) through which a tension member (5) to be inserted into the interior (4) of the structure (1) passes; and a male member (15) having a second through hole (16) through which the tension member (5) passes and which is pushed into the first through hole (13) to hold the tension member (5) in the second through hole (16), The wedge member (30) is formed in a wedge shape that becomes thinner toward the tip side, and has a tapered surface (31) on at least a part of its side surface. When the wedge member (30) is inserted into the opposing space (S) from its tip end side so that the tapered surface (31) faces either the stationary object (OB) or the male member (15), one surface (32) on the stationary object (B) side receives a reaction force directly or indirectly from the stationary object (OB), while the other surface (31) on the male member (15) side transmits a force in a pushing direction to the male member (15) directly or indirectly, thereby pushing the male member (15) into the first through hole (13). It is characterized by:

[0008] Another embodiment of the present disclosure provides a pressing tool (20): a first wedge member (30) as the wedge member (30); a second wedge member (40) provided so as to be able to slide on the first wedge member (30), The first wedge member (30) is inserted into the opposing space (S) so that the first tapered surface (31) as the tapered surface (31) becomes the other surface (31) that indirectly transmits the force in the pushing direction, and the surface (32) opposite to the first tapered surface (31) becomes the one surface (32) that receives the reaction force from the stationary object (OB), The second wedge member (40) has a second tapered surface (41) that slides against the first tapered surface (31) as the first wedge member (30) is inserted into the opposing space (S), and is disposed in the opposing space (S) so that a surface (42) opposite to the second tapered surface (41) comes into contact with the end surface of the male member (15). It is desirable.

[0009] In another embodiment of the present disclosure, a pressing jig (20) is provided. The first wedge member (30) and the second wedge member (40) each have a notch (38, 48) for receiving the tendon (5) protruding from the male member (15) into the opposing space (S). It is desirable.

[0010] Another embodiment of the present disclosure provides a pressing tool (20): The first wedge member (30) has both side surfaces (33, 34) opposed to each other across the first tapered surface (31) thereof, and the second wedge member (40) has both side surfaces (43, 44) opposed to each other across the second tapered surface (41) thereof, and the pair of guide plate members (50A, 50B) support the both side surfaces (33, 34) of the first wedge member (30) so as to be slidable along the inclination direction of the tapered surfaces (31, 41). It is desirable.

[0011] Another embodiment of the present disclosure provides a pressing tool (20): A rod member (60) for inserting the first wedge member (30) into the opposing space (S) is connected to the end of the first wedge member (30) opposite to the tip side. It is desirable.

[0012] Another embodiment of the present disclosure provides a pressing tool (20): A resin plate member (42A) that contacts the end face of the male member (15) is provided on a surface (42) of the second wedge member (40) opposite to the second tapered surface (41). It is desirable.

[0013] The method for installing a fixing tool using a pressing jig according to the present disclosure includes: With the tendon (5) passing through the first through hole (13) and the second through hole (16) and the male member (15) inserted into the first through hole (13), a spacer member (SP) for transmitting the reaction force to the one surface (32) of the first wedge member (30) is disposed between the male member (15) and the stationary object (OB); The second wedge member (40) is disposed in the opposing space (S) so that a surface (42) opposite to the second tapered surface (41) contacts the end surface of the male member (15), The first wedge member (30) is inserted into the opposing space (S) so that the first tapered surface (31) is in sliding contact with the second tapered surface (41) while the one surface (32) receives the reaction force from the stationary object (OB) via the spacer member (SP), and a force in the pushing direction is transmitted from the second wedge member (40) to the male member (15), thereby pushing the male member (15) into the first through hole (13). It is characterized by:

[0014] 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]

[0015] According to the technique of the present disclosure, the male member (male cone) of the fixing tool can be effectively pressed into the female member (female cone). [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic cross-sectional view showing an example of a fastener installed in a concrete structure. [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 to 10C are schematic diagrams illustrating a procedure for installing a conventional fixing tool that does not use a pressing jig. [Figure 5] FIG. 1 is a schematic perspective view showing a pressing jig according to the present embodiment. [Figure 6] FIG. 2 is a cross-sectional view showing a schematic view of a pressing jig according to the present embodiment. [Figure 7] 10A to 10C are schematic diagrams illustrating a method for installing a fixing tool using a pressing jig according to the present embodiment. [Figure 8] 10A to 10C are schematic diagrams illustrating a method for installing a fixing tool using a pressing jig according to the present embodiment. [Figure 9] 10A to 10C are schematic diagrams illustrating a method for installing a fixing tool using a pressing jig according to the present embodiment. [Figure 10] 10A to 10C are schematic diagrams illustrating a method for installing a fixing tool using a pressing jig according to the present embodiment. [Figure 11] 10A to 10C are schematic diagrams illustrating a method for installing a fixing tool using a pressing jig according to the present embodiment. [Figure 12] FIG. 10 is a schematic perspective view showing a pressing jig according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, a pressing jig according to this embodiment will be described with reference to the accompanying drawings.

[0018] [Fixing device overview] First, before describing the pushing jig according to this embodiment, an outline of the fixing tool to be installed in the concrete structure will be described.

[0019] Fig. 1 is a schematic cross-sectional view showing an example of a fastener 10 installed in a concrete structure 1. As shown in Fig. 1, a sheath pipe 4 is embedded in the concrete structure 1 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. The concrete structure 1 may be either cast-in-place or precast concrete.

[0020] A tendon 5 that applies prestress to the concrete structure 1 is inserted into the sheath tube 4. The tendon 5 may be, for example, a PC (prestressed concrete) steel wire made by twisting together multiple steel wires, or a PC steel rod. One end of the tendon 5 is fixed to one end E1 of the concrete structure 1 by an anchor 10. A tensioning device 6 such as a hydraulic jack is attached to the other end of the tendon 5 via the anchor 10.

[0021] The fixing device 10 includes a bearing plate 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 that penetrates the bearing plate 11 in the plate thickness direction is provided in the approximate center. A tendon 5 is inserted into the insertion hole 11A. The bearing plate 11 may be embedded in one end E1 of the concrete structure 1 in advance, or may be disposed at one end E1 of the concrete structure 1 when the fixing device 10 is installed. The bearing plate 11 is sometimes also called an anchor plate.

[0022] 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 expands from the concrete structure 1 side toward the opposite side. The female cone 12 is disposed on the surface of the bearing plate 11 opposite to the concrete structure 1 so that the through hole 13 is concentric with the insertion hole 11A.

[0023] 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 members 15A to 15C that are adjacent to each other in the circumferential direction are preferably connected by fitting a ring member 17 made of resin or the like into a recessed groove provided at the end on the expanded 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.

[0024] [Conventional installation procedure for fasteners without using a push-in 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 structure 1 (see FIG. 1). At this time, as shown in FIG. 4(A), the tendon 5 penetrates the insertion hole 11A of the bearing plate 11 and is inserted until it protrudes a predetermined length from the one end E1 of the concrete structure 1. There is no particular restriction on the protrusion amount of the tendon 5, but it should protrude at least longer than the axial length of the female cone 12.

[0025] 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.

[0026] After the male cone 15 is inserted into the through-hole 13, as shown in FIG. 4(D), a cylindrical jig 19, for example, 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 FIG. 1) attached to the other end of the tendon 5 is activated to apply tension to the tendon 5. As a result, the male cone 15 is fitted into the through-hole 13, which has a tapered inner circumferential surface of the female cone 12, and the tendon 5 is held in the through-hole 16 of the male cone 15, thereby 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 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.

[0027] Here, as shown by the dashed line in Figure 1, consider a case where there is an obstacle OB such as an existing concrete structure on one end E1 side of the concrete structure 1 (i.e., the back side of the fixing device 10), and sufficient working space cannot be secured in the opposing space S.

[0028] In the installation work of a conventional fixing tool 10, it is necessary to strike the male cone 15 with a hammer HM or the like while a cylindrical jig 19 is placed against the male cone 15 (see FIG. 4(D)). For this reason, if there is insufficient working space behind the fixing tool 10, it is not possible to insert the cylindrical jig 19 or swing the hammer HM, and it is not possible to press the male cone 15 into the female cone 12. If tension is applied to the tendon 5 when the male cone 15 is not sufficiently pressed into the female cone 12, the tendon 5 will be pulled out of the male cone 15, making it impossible to secure the desired slack length LE, or the components 15A to 15C will come apart, resulting in the problem of not being able to install the fixing tool 10 correctly.

[0029] The pressing jig according to this embodiment solves these problems. Details of the pressing jig will be described below.

[0030] [Push-in jig] Fig. 5 is a schematic perspective view showing the pressing jig 20 according to this embodiment. Fig. 6 is a schematic cross-sectional view showing the pressing jig 20 according to this embodiment.

[0031] As shown in Figures 5 and 6, the pressing jig 20 mainly comprises a first wedge member 30, a second wedge member 40, a pair of guide plates 50A, 50B, and a rod member 60. In the following description, the longitudinal direction of the rod member 60 is referred to as the "vertical direction," and among the directions perpendicular to the longitudinal direction of the rod member 60, the side of the first wedge member 30 is referred to as the "rear" and the side of the second wedge member 40 is referred to as the "front." Furthermore, the direction perpendicular to the front-rear direction and the vertical direction is referred to as the "lateral direction" or "width direction." Note that these directions are defined for convenience in the description and do not limit the directions in which the pressing jig 20 is actually used.

[0032] The first wedge member 30 is formed into a wedge shape with its lateral side becoming thinner toward the lower end (tip side). The first wedge member 30 is preferably made of a metal, such as steel, stainless steel, or aluminum, but a resin material such as FRP can also be used. The first wedge member 30 has a first tapered surface 31 that is inclined at a predetermined angle relative to its rear surface 32. Opposing lateral sides 33 and 34 of the first wedge member 30 across the first tapered surface 31 are provided with female threaded holes (not shown) that threadably engage with male threads of a support member 70, which will be described later. The first wedge member 30 is slidably supported by a pair of guide plates 50A and 50B via the support member 70.

[0033] The second wedge member 40 is formed into a wedge shape with its lateral side becoming thinner toward the upper end. The second wedge member 40 is preferably made of a metal, such as steel, stainless steel, or aluminum, but a resin material such as FRP can also be used. The second wedge member 40 has a second tapered surface 41 that is inclined at a predetermined angle relative to its front surface 42. Opposing lateral sides 43 and 44 of the second wedge member 40 across the second tapered surface 41 are provided with female threaded holes (not shown) that threadably engage with male threads of a support member 80, which will be described later. The second wedge member 40 is slidably supported by a pair of guide plates 50A and 50B via the support member 80.

[0034] The first wedge member 30 and the second wedge member 40 are configured such that the first tapered surface 31 and the second tapered surface 41 are in contact with each other when supported by a pair of guide plates 50A, 50B. The inclination angles of the first tapered surface 31 and the second tapered surface 41 are preferably set to the same angle. The widths of the first wedge member 30 and the second wedge member 40 are preferably formed to be larger than the outer diameter of the male cone 15 (see FIG. 2). The lengths (thicknesses) of the first wedge member 30 and the second wedge member 40 in the front-rear direction are not particularly limited, but it is desirable that the thickest portions be slightly longer than the outer diameter of the tendon 5. With this configuration, when the male cone 15 is pushed in as described below, the excess length LE of the tendon 5 can be made approximately equal to the outer diameter of the tendon 5. Furthermore, by making the first wedge member 30 and the second wedge member 40 to have the minimum necessary thickness, it becomes possible to insert the pressing jig 20 into a narrow space.

[0035] A first cutout 38 that opens downward is provided at approximately the center in the width direction of the first wedge member 30. Similarly, a second cutout 48 that opens downward is provided at approximately the center in the width direction of the second wedge member 40. The first cutout 38 and the second cutout 48 are formed in a U-shape that curves upward and convexly when viewed from the front of the first wedge member 30 and the second wedge member 40. The width of the first cutout 38 and the second cutout 48 is formed larger than the outer diameter of the tendon 5. In other words, the first cutout 38 and the second cutout 48 are configured to be able to receive the tendon 5. The curved portion 48A on the upper end side of the second cutout 48 is formed with an inner diameter slightly larger than the outer diameter of the tendon 5. The pushing jig 20 is configured so that it can be stably placed on the tendon 5 by seating the curved portion 48A of the second cutout portion 48 on the tendon 5.

[0036] The guide plates 50A, 50B are formed in the shape of long rectangular plates. The material of the guide plates 50A, 50B is preferably metal, such as steel, stainless steel, or aluminum. The length of the longitudinal direction (vertical direction) of the guide plates 50A, 50B is not particularly limited, but is preferably formed to have approximately the same length as the longitudinal direction of the first wedge member 30 and the second wedge member 40. The length of the guide plates 50A, 50B in the direction perpendicular to the longitudinal direction (front-rear direction) is also not particularly limited, but is preferably formed to have approximately the same length as the thickest portion of the first wedge member 30 and the second wedge member 40 in the front-rear direction.

[0037] The guide plates 50A and 50B are each provided with a pair of guide grooves 51 and 52 that extend parallel to each other at a predetermined distance. The guide grooves 51 and 52 are inclined with respect to the long sides of the guide plates 50A and 50B at approximately the same inclination angle as the first tapered surface 31 and the second tapered surface 41. The first wedge member 30 is slidably supported in the upper first guide groove 51 via a support member 70. The second wedge member 40 is slidably supported in the lower second guide groove 52 via a support member 80. In other words, the first wedge member 30 and the second wedge member 40 are configured to be slidable along the guide grooves 51 and 52 with the tapered surfaces 31 and 41 in sliding contact with each other.

[0038] The support members 70, 80 support the first wedge member 30 and the second wedge member 40 on the guide plates 50A, 50B. The support members 70, 80 are, for example, bolts that screw into female threaded holes provided in the lateral surfaces 33, 34, 43, 44 of the first wedge member 30 and the second wedge member 40, respectively. A pair of support members 70, 80 is provided for each of the first guide groove 51 and the second guide groove 52. The pair of support members 70, 80 is disposed at a distance shorter than the longitudinal length of each guide groove 51, 52, and supports the first wedge member 30 and the second wedge member 40 so that they can slide along the guide plates 50A, 50B. In this way, by supporting the first wedge member 30 and the second wedge member 40 by the pair of support members 70, 80, respectively, the first wedge member 30 and the second wedge member 40 can be stably supported in the guide grooves 51, 52. The form of the support members 70, 80 is not limited to bolts, and forms other than bolts can be used as long as they are configured to support the first wedge member 30 and the second wedge member 40 so that they can slide.

[0039] Incidentally, it is also possible to provide only the guide grooves 51 in the guide plates 50A, 50B, and to configure the second wedge member 40 to be fixed to the guide plates 50A, 50B. However, if the first wedge member 30 is supported by a pair of support members 70 relative to the relatively short guide groove 51, although stability is achieved, the stroke of the first wedge member 30 becomes shorter, thereby reducing the forward movement amount of the second wedge member 40 (i.e., the pushing amount of the male cone 15), which will be described later. In this case, it is possible to consider making the guide grooves 51 longer. However, if the guide grooves 51, which are inclined relative to each side of the guide plates 50A, 50B, are made longer, the lengths of the guide plates 50A, 50B in the front-to-back and up-to-down directions also become longer, resulting in an increase in the size of the entire pushing jig 20.

[0040] In this embodiment, two guide grooves 51, 52 extending parallel to each other are provided in the guide plates 50A, 50B, and the first wedge member 30 and the second wedge member 40 are configured to be able to slide relative to each other with respect to the guide plates 50A, 50B. This effectively lengthens the relative stroke of the first wedge member 30, while effectively ensuring the forward movement amount of the second wedge member 40, i.e., the pushing amount of the male cone 15. Furthermore, the lengths of the guide plates 50A, 50B in the front-to-rear and up-to-down directions can be minimized (at least approximately the same lengths as the first wedge member 30 and the second wedge member 40), which also makes it possible to reduce the size of the entire pushing jig 20.

[0041] The rod member 60 is formed in an elongated shape and has a male threaded portion 61 at the lower end and a tubular portion 62 at the upper end. The lower end of the male threaded portion 61 is connected to the upper end of the first wedge member 30. The male threaded portion 61 can be connected by threading onto a nut N (not shown) attached to the upper end of the first wedge member 30 by welding or the like. A female thread (not shown) is provided inside at least the lower end of the tubular portion 62, and the upper end of the male threaded portion 61 is threaded onto the female threaded portion. The rod member 60 is configured so that its overall length can be changed by adjusting the degree of engagement between the tubular portion 62 and the male threaded portion 61. Note that the overall length of the rod member 60 can be further increased by connecting multiple threaded rods having male threads with joints or the like. Furthermore, the configuration for adjusting the overall length of the rod member 60 can be configured using a configuration other than a threaded rod. Furthermore, the rod member 60 does not necessarily have to have a configuration for adjusting its overall length.

[0042] [Fixing fixture installation method] Next, a method for installing the fixing tool 10 using the pushing jig 20 according to this embodiment will be described with reference to Figures 7 to 11. Below, an example of an installation method will be described in which sufficient working space cannot be secured on the one end E1 side of the concrete structure 1 (i.e., the back side of the fixing tool 10).

[0043] <Advance preparation> 7, when an obstacle OB such as another concrete structure is adjacent to one end 1E of the concrete structure 1, it is difficult for a worker to insert his or her hand into the opposing space S and continuously hold the female cone 12 at the desired position of the bearing plate 11 (for example, a position where the axes of the through hole 13 and the insertion hole 11A are approximately aligned). In this embodiment, it is desirable to attach the bearing plate 11 and the female cone 12 to one end 1E of the concrete structure 1 in advance.

[0044] Specifically, the female cone 12 is fixed to the bearing plate 11 with bolts B, and the bearing plate 11 integrated with the female cone 12 is embedded in advance at one end 1E of the concrete structure 1. When constructing the concrete structure 1 using a cast-in-place method, fresh concrete can be poured into the formwork with the bearing plate 11 with the female cone 12 fixed thereto attached to the formwork. When constructing the concrete structure 1 using a precast segment method, the bearing plate 11 with the female cone 12 fixed thereto can be embedded when the precast concrete member is manufactured in a factory.

[0045] <1st process> As shown in Figure 8, in the first step, the tendon 5 is inserted into the insertion hole 11A of the support plate 11 and into the through hole 13 of the female cone 12. The tip of the tendon 5 protruding from the through hole 13 of the female cone 12 is inserted into the through hole 16 of the male cone 15, thereby temporarily holding the male cone 15 to the tendon 5. At this time, the male cone 15 is inserted to some extent into the through hole 13 of the female cone 12, with the tendon 5 protruding from the back side of the male cone 15. Furthermore, a spacer SP for adjusting the gap is placed between the tip of the tendon 5 protruding from the male cone 15 and the obstacle OB, i.e., on the back side of the male cone 15. At this time, the distance between the front surface of the spacer SP and the rear surface of the male cone 15 is set to at least a distance that allows the lower end of the second wedge member 40 (see Figure 9) to be inserted between them. The shape and structure of the spacer SP may be any as long as it allows the first wedge member 30 (see Figure 9) to obtain a reaction force from the obstacle OB, and for example, a rectangular piece of wood (such as a batten) or a rectangular piece of steel may be used.

[0046] <Second process> 9, in the second step, the second wedge member 40 of the pushing jig 20 is placed from above between the spacer SP and the male cone 15. Specifically, the second wedge member 40 is set so that the tension member 5 protruding from the male cone 15 is received in the second cutout portion 48 of the second wedge member 40 and the inner surface of the curved portion 48A is seated on the outer peripheral surface of the tension member 5. This operation can be performed by an operator while holding the rod member 60 of the pushing jig 20.

[0047] <3rd process> 10 , in the third step, the first wedge member 30 is pushed downward by striking the upper end of the rod member 60 with a hammer or the like (not shown). When the first wedge member 30 is pushed downward, the rear surface 32 receives a reaction force from the immovable obstacle OB via the spacer SP, and the first tapered surface 31 slides against the second tapered surface 41, moving the second wedge member 40 forward. As a result, a pushing force is transmitted from the second wedge member 40 to the male cone 15, and the male cone 15 moves forward, allowing the male cone 15 to be pushed into the through-hole 13 of the female cone 12.

[0048] If the male cone 15 is sufficiently pressed into the through hole 13 before the support member 70 reaches the lower end of the guide groove 51, the pushing down of the first wedge member 30 (i.e., the hammering) is terminated. On the other hand, as shown in FIG. 10 , if the male cone 15 is not sufficiently pressed into the through hole 13 when the support member 70 reaches the lower end of the guide groove 51, the hammering is continued. Continuing the hammering moves the guide groove 52 relative to the support member 80, as shown in FIG. 11 . That is, the first wedge member 30 is pushed downward integrally with the guide plates 50A and 50B. This further pushes the second wedge member 40 toward the male cone 15, making it possible to reliably press the male cone 15 into the through hole 13 of the female cone 12.

[0049] Once the male cone 15 has been pushed into the through-hole 13 of the female cone 12, the tensioning device 6 (see Figure 1) 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 fix the tendon 5 in place.

[0050] According to the present embodiment described above in detail, the pushing jig 20 includes a pair of wedge members 30, 40 with their tapered surfaces 31, 41 in contact with each other, and is configured so that when the first wedge member 30 is pressed down with the second wedge member 40 in surface contact with the rear surface of the male cone 15, the second wedge member 40 is pushed toward the male cone 15. This makes it possible to reliably push the male cone 15 into the through-hole 13 of the female cone 12 even when there is insufficient working space on the rear side of the male cone 15 for using a hammer or the like. Furthermore, because the male cone 15 can be pushed in with the front surface 42 of the second wedge member 40 in surface contact with the end surface of the male cone 15, it is possible to effectively prevent the components 15A-15C of the male cone 15 from coming apart during pushing, and it is possible to easily and correctly install the fixing device 10.

[0051] 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.

[0052] For example, as shown in Figure 12, a resin plate member 42A may be attached to the front surface 42 of the second wedge member 40. In this way, providing the resin plate member 42A at the portion that contacts the end face of the male cone 15 can effectively prevent breakage or damage to the male cone 15. It is also possible to make the second wedge member 40 itself out of resin.

[0053] Furthermore, in the above embodiment, the spacer SP is described as being used, but if the first wedge member 30 can directly receive a reaction force from the obstacle OB, the spacer SP can be omitted. Furthermore, the pushing jig 20 has been described as being used by being disposed in the opposing space S with the first wedge member 30 at the rear and the second wedge member 40 at the front, but these positions can also be reversed. Depending on the space behind the male cone 15 and the shape of the obstacle OB, the pushing jig 20 can be used without the second wedge member 40, and the male cone 15 can be pushed in by only the first wedge member 30. [Explanation of symbols]

[0054] 1...concrete structure, E1...one end, E2...other end, 4...sheath tube, 5...tensioning member, 6...tensioning device, 10...fixing tool, 11...bearing plate, 11A...insertion hole, 12...female cone, 13...through hole, 15...male cone, 16...through hole, 17...ring member, 20...pushing jig, 30...first wedge member, 31...first tapered surface, 32...rear surface, 33, 34... Lateral surface, 38...first cutout portion, 40...second wedge member, 41...second tapered surface, 42...front surface, 43, 44...lateral surface, 48...second cutout portion, 48A...curved portion, 50A, 50B...guide plate, 51, 52...guide groove, 60...rod member, 61...male thread portion, 62...tubular portion, 70, 80...support member, N...nut, SP...spacer, B...bolt, S...opposing space

Claims

1. A fixing device includes a female member having a first through hole through which a tension member to be inserted into a structure passes, and a male member having a second through hole through which the tension member passes and which is pushed into the first through hole to hold the tension member in the second through hole, the fixing device being used to push the male member into the first through hole when installing the fixing device in a space facing an end of the structure and an immovable object, The wedge member is formed in a wedge shape that becomes thinner toward the tip side, and has a tapered surface on at least a part of its side surface, When the wedge member is inserted into the opposing space from its tip end so that the tapered surface faces either the stationary object or the male member, one surface on the stationary object side receives a reaction force directly or indirectly from the stationary object, while the other surface on the male member side directly or indirectly transmits a force in a pushing direction to the male member, thereby pushing the male member into the first through hole. A pressing jig characterized by:

2. The pressing jig according to claim 1, a first wedge member as the wedge member; a second wedge member provided so as to be able to slide on the first wedge member, the first wedge member is inserted into the opposing space so that a first tapered surface as the tapered surface becomes the other surface that indirectly transmits the force in the pushing direction, and a surface opposite to the first tapered surface becomes the one surface that receives the reaction force from the stationary object, The second wedge member has a second tapered surface that comes into sliding contact with the first tapered surface as the first wedge member is inserted into the opposing space, and is disposed in the opposing space so that a surface opposite to the second tapered surface comes into contact with an end surface of the male member. A pressing jig characterized by:

3. The pressing jig according to claim 2, The first wedge member and the second wedge member each have a notch for receiving the tendon protruding from the male member into the opposing space. A pressing jig characterized by:

4. The pressing jig according to claim 2, a pair of guide plate members that support both side surfaces of the first wedge member that face each other across the first tapered surface and both side surfaces of the second wedge member that face each other across the second tapered surface so that the guide plate members can slide along the inclination direction of the tapered surfaces; A pressing jig characterized by:

5. The pressing jig according to claim 2, A rod member for inserting the first wedge member into the opposing space is connected to an end portion of the first wedge member opposite to the tip side. A pressing jig characterized by:

6. The pressing jig according to claim 3, A resin plate member that comes into contact with the end face of the male member is provided on the surface of the second wedge member opposite to the second tapered surface. A pressing jig characterized by:

7. A method for installing a fixing tool using the pressing jig according to claim 2 or 3, comprising: a spacer member for transmitting the reaction force to the one surface of the first wedge member between the male member and the stationary object in a state in which the tendon is passed through the first through hole and the second through hole and the male member is inserted into the first through hole; the second wedge member is disposed in the opposing space so that the surface opposite to the second tapered surface contacts the end surface of the male member; The first wedge member is inserted into the opposing space so that the first tapered surface is in sliding contact with the second tapered surface while the one surface receives the reaction force from the stationary object via the spacer member, and a force in a pushing direction is transmitted from the second wedge member to the male member, thereby pushing the male member into the first through hole. A method for installing a fastener, comprising:

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