Anchorage structure and anchorage structure manufacturing method

Abstract

To provide an anchorage structure that can secure anticorrosion property of PC steel material.SOLUTION: An anchorage structure comprises multiple PC steel members that are arranged inside a concrete member and an anchorage device that anchors the aforesaid PC steel members to the aforesaid concrete member. Each of the aforesaid multiple PC steel members comprises twisted PC steel wires that are tensioned and anchored at the end face of the aforesaid concrete member, a resin layer covering the outer peripheral surface of the aforesaid twisted PC steel wires, and a sheath covering the outside of the aforesaid resin layer. The aforesaid anchorage device comprises multiple wedges that grip each end part of the aforesaid twisted PC steel wires exposed from the aforesaid resin layer and the aforesaid sheath, and an anchor disk that has multiple wedge holes into which each of the aforesaid wedges is individually engaged.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present disclosure relates to an anchoring structure and a method for manufacturing the anchoring structure.

Background Art

[0002] In concrete structures such as bridges, prestressed concrete (PC) members in which PC steel materials are arranged inside concrete members are used. The PC steel material is fixed to the concrete member in a tensioned state by a fixture attached to the end of the PC steel material. The tension of the PC steel material is maintained by the fixture, and compressive stress is applied to the concrete member.

[0003] Patent Document 1 discloses a prestressing material for prestressed concrete. This prestressing material is a collective cable composed of a plurality of PC steel wires covered with a sheath. A resin formulation that cures after the collective cable is tensioned is pre-filled between the collective cable and the sheath.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The above-mentioned prestressing material is directly embedded in the concrete when the concrete member is placed. The collective cable is tensioned after the concrete has hardened. The resin formulation cures after the collective cable is tensioned, thereby integrating the collective cable and the concrete member. The resin formulation has time-dependent curability, which cures over time after the collective cable is tensioned.

[0006] The above-mentioned prestressing wires are configured such that the entire assembled cable is covered with a sheath, and the outer peripheral surfaces of the individual wires are not covered. That is, each wire is a bare PC steel wire.

[0007] When the assembled cable is tensioned, the plurality of wires are tightened toward the center of the assembled cable. Therefore, lateral pressure acts on the wire arranged outside the center wire due to contact between the wire arranged outside the center wire and the wire arranged at the center of the assembled cable. Since each wire is a bare PC steel wire, the wires come into direct contact with each other. At the location where the lateral pressure acts, fretting occurs on the wires due to rubbing between the wires. Therefore, there is a risk of the wires breaking due to fretting fatigue.

[0008] In particular, for an assembled cable arranged in a bent state, bending stress is added in addition to the above-mentioned lateral pressure. Therefore, fretting fatigue is more likely to occur in the wires, and it is more likely to cause the wires to break.

[0009] Even if the above resin composition is filled between the wires, the resin composition cannot prevent fretting of the wires. This resin composition is in an uncured state when the assembled cable is tensioned and is flowed by the above-mentioned lateral pressure. Therefore, the resin composition cannot prevent contact between the wires and does not function as a buffer material between the wires.

[0010] Another problem with the above-mentioned tension member is that in the fixing structure for fixing the assembled cable to the concrete member, the corrosion resistance of the end portions of the PC steel wires forming the assembled cable cannot be ensured. In the above-mentioned fixing structure, since a fixing tool is attached to the end portion of each PC steel wire, it is necessary to arrange the PC steel wires so that they are separated from each other. Therefore, at the end portion of the tension member, the resin composition and the sheath are removed, and the end portions of the PC steel wires are exposed over a certain length. That is, the end portions of the PC steel wires are not covered by the sheath from the end portion of the sheath to the portion where the fixing tool is attached.

[0011] In the above-mentioned fixing structure, the end portions of the PC steel wires exposed from the sheath may corrode. It is necessary to perform an anti-corrosion treatment to prevent corrosion of the end portions of the PC steel wires, which is time-consuming. For the anti-corrosion treatment, for example, methods such as applying resin or injecting grout are adopted. When performing the anti-corrosion treatment with grout, excess moisture separated from the grout may penetrate into the inside of the PC steel wire from the gaps between the steel wires constituting the PC steel wire, and the steel wires may corrode.

[0012] One of the objectives of the present disclosure is to provide a fixing structure capable of ensuring the corrosion resistance of PC steel materials.

Means for Solving the Problems

[0013] The fixing structure of the present disclosure includes a plurality of PC steel materials arranged inside a concrete member, and a fixing tool for fixing the plurality of PC steel materials to the concrete member. Each of the plurality of PC steel materials includes a PC steel wire fixed to the end face of the concrete member in a tensioned state, a resin layer covering the outer peripheral surface of the PC steel wire, and a sheath covering the outside of the resin layer. The fixing tool includes a plurality of wedges for gripping the respective end portions of the PC steel wires exposed from the resin layer and the sheath, and an anchor disk having a plurality of wedge holes into which each of the plurality of wedges is individually fitted.

Effects of the Invention

[0014] The fixing structure of the present disclosure can ensure the corrosion resistance of PC steel materials.

Brief Description of the Drawings

[0015]

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Modes for Carrying Out the Invention

[0016] [Description of Embodiments of the Present Disclosure] First, the embodiments of the present disclosure will be listed and described.

[0017] (1) The fixing structure of the present disclosure includes a plurality of PC steel materials disposed inside a concrete member, and a fixture that fixes the plurality of PC steel materials to the concrete member. Each of the plurality of PC steel materials includes a PC steel wire fixed to an end face of the concrete member in a tensioned state, a resin layer covering an outer peripheral surface of the PC steel wire, and a sheath covering an outside of the resin layer. The fixture includes a plurality of wedges that grip respective end portions of the PC steel wire exposed from the resin layer and the sheath, and an anchor disk having a plurality of wedge holes into which each of the plurality of wedges is individually fitted.

[0018] In each of the plurality of PC steel materials, the outside of the PC steel wire is covered with a sheath. In the fixing structure of the present disclosure, at an end portion of the PC steel material, the PC steel wire is not exposed from the resin layer and the sheath except for an end portion gripped by the wedge. Therefore, the fixing structure of the present disclosure can ensure the corrosion resistance of the PC steel material.

[0019] Further, the sheath prevents the PC steel wires constituting adjacent PC steel materials from directly contacting each other. By functioning as a buffer material between the PC steel wires, the sheath suppresses the fretting fatigue of the PC steel material.

[0020] (2) In the fixing structure of (1) above, the plurality of PC steel materials may be arranged in parallel with each other.

[0021] Compared with a plurality of PC steel materials arranged randomly, when the PC steel wires are tensioned, the lateral pressure described above is less likely to occur in the plurality of PC steel materials arranged in parallel. If the lateral pressure is less likely to occur, fretting is less likely to occur in the PC steel wires, and the fretting fatigue of the PC steel material can be further suppressed.

[0022] (3) In the fixing structure of (1) or (2) above, further, a duct embedded inside the concrete member and into which the plurality of PC steel materials are inserted, and grout filled in a gap between the duct and the plurality of PC steel materials may be provided.

[0023] In the configuration where the PC steel material is disposed in the duct, after the placement of the concrete member is completed, the PC steel material is inserted into the duct embedded in the concrete member. Therefore, the PC steel material may be prepared according to the timing when the placement of the concrete member is completed. Even if the period until the placement of the concrete member is completed is long, by preparing the PC steel material immediately before inserting it into the duct, it is easy to tension the PC steel wire before the resin layer hardens.

[0024] When the resin layer hardens after the tension of the PC steel wire, the PC steel wire is integrated with the sheath. That is, the PC steel wire, the resin layer, and the sheath that constitute the PC steel material are integrated. When the grout hardens, the sheath and the duct are integrated. By these integrations, the plurality of PC steel materials and the grout in the duct and the concrete member outside the duct are integrated, so that the plurality of PC steel materials and the concrete member are integrated.

[0025] (4) The manufacturing method of the fixing structure of the present disclosure includes a step of arranging a plurality of PC steel materials having PC steel wires inside a concrete member, a step of tensioning the PC steel wires, and a step of fixing the PC steel wires to the end face of the concrete member by a fixing tool. Each of the plurality of PC steel materials includes a resin layer covering the outer peripheral surface of the PC steel wire and a sheath covering the outside of the resin layer. The resin layer is hardened after the tension of the PC steel wire. The fixing tool includes a plurality of wedges that grip the respective end portions of the PC steel wires exposed from the resin layer and the sheath, and an anchor disk having a plurality of wedge holes into which each of the plurality of wedges is individually fitted.

[0026] In each of the plurality of PC steel materials, the outside of the PC steel wire is covered by the sheath. In the manufacturing method of the fixing structure of the present disclosure, at the end of the PC steel material, the PC steel wire is not exposed from the resin layer and the sheath except for the end portion gripped by the wedge. Therefore, the manufacturing method of the fixing structure of the present disclosure can ensure the corrosion resistance of the PC steel material.

[0027] (5) In the method for manufacturing the fixing structure according to (4) above, in the step of arranging the plurality of PC steel materials, the plurality of PC steel materials may be arranged in parallel with each other.

[0028] In the manufacturing method of the fixing structure according to (5) above, a plurality of PC steel materials are arranged in parallel. When the wires of the plurality of PC steel materials arranged in parallel are tensioned, the above-mentioned lateral pressure is less likely to occur. If the lateral pressure is less likely to occur, fretting is less likely to occur in the PC steel wires, and the fretting fatigue of the PC steel materials can be more effectively suppressed.

[0029] (6) In the method for manufacturing the fixing structure according to (4) or (5) above, before the step of arranging the plurality of PC steel materials, a step of embedding a duct inside the concrete member, and after the step of arranging the plurality of PC steel materials, a step of filling the duct with grout may be provided. In the step of arranging the plurality of PC steel materials, the plurality of PC steel materials are inserted into the duct all at once.

[0030] In the manufacturing method of the fixing structure according to (6) above, after the casting of the concrete member is completed, PC steel materials are inserted into the duct embedded in the concrete member. Therefore, it is only necessary to prepare the PC steel materials in accordance with the timing when the casting of the concrete member is completed. Even if the period until the casting of the concrete member is completed is long, by preparing the PC steel materials immediately before inserting them into the duct, it is easy to tension the PC steel wires before the resin layer hardens.

[0031] [Details of Embodiments of the Present Disclosure] A specific example of the fixing structure according to the embodiment will be described below. The same reference numerals in the drawings indicate the same objects. The sizes of the members shown in each drawing are expressed for the purpose of clarifying the description and do not necessarily represent actual dimensional relationships. It should be noted that the present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0032] (Concrete member) As shown in FIGS. 11 and 12, the fixing structure of the embodiment includes a plurality of PC steel materials 1 and a fixture 5. The plurality of PC steel materials 1 are fixed to the concrete member 100 by the fixture 5. Prior to a specific description of the fixing structure, with reference to FIG. 1, the concrete member 100 will be described. The concrete member 100 is used for a concrete structure. In this example, the concrete structure is a bridge. The concrete member 100 is a floor slab in the bridge. The floor slab is installed on the main girder spanned between the bridge piers. The X direction in the figure is the direction along the length of the concrete member 100, which is the direction along the length of the bridge in this example. The Y direction is the direction along the width of the concrete member 100, which is the direction along the width of the bridge in this example. The Z direction is the direction along the thickness of the concrete member 100, which is the direction along the height of the bridge in this example.

[0033] As shown in FIGS. 1 and 2, inside the concrete member 100, PC cables 2 are arranged along the X direction. The PC cable 2 is a bundle of a plurality of PC steel materials 1. In this example, the PC cable 2 is directly embedded inside the concrete member 100. As shown in FIG. 1, a plurality of PC cables 2 are arranged at intervals in the Y direction. In FIGS. 1 and 2, each PC cable 2 is illustrated as being composed of one PC steel material 1, but actually, as shown in FIG. 3, each PC cable 2 is composed of a plurality of PC steel materials 1. FIG. 2 shows a cross section parallel to the X-Z plane. FIG. 3 shows a cross section orthogonal to the X direction.

[0034] The concrete member 100 may be formed by assembling a formwork at the construction site and placing concrete, or it may be a precast member. A precast member is one in which concrete has been cured in a factory in advance. Also, when the concrete member 100 is a large one with a long length in the X direction, the concrete member 100 may be cast in segments, or it may be a combination of a plurality of precast members. Casting in segments means placing concrete in multiple times.

[0035] (PC steel material) The plurality of PC steel materials 1 that make up the PC cable 2 are arranged inside the concrete member 100. The plurality of PC steel materials 1 reinforce the concrete member 100 by applying compressive stress to the concrete member 100. Each of the plurality of PC steel materials 1 includes, as shown in FIG. 4, a PC steel wire 10, a resin layer 12 that covers the outer peripheral surface of the PC steel wire 10, and a sheath 14 that covers the outside of the resin layer 12.

[0036] 〈PC steel wire〉 The PC steel wire 10 is fixed to the end face of the concrete member 100 in a tensioned state by the fasteners 5 shown in FIGS. 11 and 12. The PC steel wire 10 is formed by combining a plurality of steel wires 11. The number and diameter of the steel wires 11 that make up the PC steel wire 10 are appropriately set according to the tensile strength required for the PC steel wire 10. The tensile strength of the PC steel wire 10 is, for example, 1700 MPa or more, and further 2200 MPa or more. The more the number of steel wires 11 or the larger the diameter of the steel wires 11, the thicker the PC steel wire 10 and the greater the breaking load of the PC steel wire 10. The number of steel wires 11 is, for example, 2 or more and 37 or less. If the number of steel wires 11 is 37 or less, it is easy to suppress the outer diameter of the PC steel wire 10 from becoming too large. That is, it is easy to suppress the outer diameter of the PC steel material 1 from becoming too large. If the number of steel wires 11 is 37 or less, the PC steel wire 10 is easy to bend. Therefore, it is easy to wind the PC steel material 1 around a drum or to arrange the PC steel material 1 in a bent state. The number of steel wires 11 may be further 2 or more and 20 or less. The diameter of the steel wire 11 is, for example, 2 mm or more and 6 mm or less. If the diameter of the steel wire 11 is 6 mm or less, the PC steel wire 10 is easy to bend. The diameter of the steel wire 11 may be further 2.5 mm or more and 5.5 mm or less. The diameters of the respective steel wires 11 that make up the PC steel wire 10 may be the same or different.

[0037] The outer diameter of the PC steel wire 10 is, for example, 12 mm or more and 32 mm or less. If the outer diameter of the PC steel wire 10 is 32 mm or less, it is easy to miniaturize the PC steel material 1. If the PC steel material 1 is small, the thickness of the concrete member 100 can be reduced. In addition, it is easy to wind the PC steel material 1 around a drum or arrange the PC steel material 1 in a bent state. The outer diameter of the PC steel wire 10 may be further 15 mm or more and 30 mm or less. The outer diameter of the PC steel wire 10 means the diameter of the circumscribed circle of the PC steel wire 10.

[0038] 〈Resin layer〉 The resin layer 12 covers the outer peripheral surface of the PC steel wire 10. The resin constituting the resin layer 12 is, for example, a moisture-curing type or heat-curing type resin that cures with time. The moisture-curing type resin or heat-curing type resin is, for example, the moisture-curing type epoxy resin or heat-curing type epoxy resin described in the Japan Society of Civil Engineers standard "Quality Standard (Draft) for Epoxy Resin for Pregrout PC Steel Materials (JSCE-E 146-2010)" established in 2010. The resin layer 12 in this example is made of a moisture-curing type epoxy resin. This moisture-curing type epoxy resin has bisphenol A type epoxy resin as the main component and also contains a ketimine derivative, calcium oxide, silica, etc. The moisture-curing type epoxy resin is, for example, the product name "Moisture-curing type pregrout resin (MC-MKII)" of Sumitomo Electric Industries, Ltd. The "II" in the product name means the Roman numeral "2". The resin layer 12 is in an uncured state before the tension of the PC steel wire 10 and is cured after the tension of the PC steel wire 10. When the resin layer 12 cures, the PC steel wire 10 and the resin layer 12 adhere, and the PC steel wire 10 and the sheath 14 are integrated. The resin layer 12 may be made of a heat-curing type epoxy resin. This heat-curing type epoxy resin contains bisphenol A type epoxy resin and methylene bisphenol type epoxy resin and also contains dicyandiamide, talc, etc. The heat-curing type epoxy resin is, for example, the product name "Heat-curing type pregrout resin" of Sumitomo Electric Industries, Ltd. When the resin layer 12 is composed of a heat-curing type resin, the curing of the heat-curing type resin is promoted by the heat of reaction generated by the hydration reaction when the concrete cures.

[0039] The resin layer 12 is formed, for example, by applying a resin that cures over time to the outer peripheral surface of the PC steel wire 10 or by extrusion coating the resin that cures over time.

[0040] 〈Sheath〉 The sheath 14 covers the outside of the resin layer 12. The sheath 14 is composed of resin. The sheath 14 in this example is made of polyethylene resin, specifically high-density polyethylene resin. The polyethylene sheath 14 has high durability. On the outer peripheral surface of the sheath 14, uneven portions are formed in which ridges and valleys are alternately arranged in the direction along the length of the PC steel material 1. When the resin layer 12 cures, the uneven portions engage with the surrounding concrete, whereby the PC steel material 1 is integrated with the concrete member 100.

[0041] The sheath 14 protects the PC steel wire 10. The sheath 14 prevents the PC steel wires 10 that constitute adjacent PC steel materials 1 from directly contacting each other. By functioning as a buffer material between the PC steel wires 10, rubbing between the PC steel wires 10 can be avoided. Therefore, fretting fatigue of the PC steel material 1 can be suppressed. Further, the sheath 14 has a function of preventing corrosion of the PC steel wire 10. The sheath 14 prevents surplus moisture separated from the concrete from penetrating into the interior of the PC steel material 1.

[0042] The thickness of the sheath 14 is, for example, 2 mm or more and 5 mm or less. If the thickness of the sheath 14 is 2 mm or more, it is easy to protect the PC steel wire 10. If the thickness of the sheath 14 is 5 mm or less, it is easy to miniaturize the PC steel material 1. The thickness of the sheath 14 may be further 2.5 mm or more and 4.5 mm or less.

[0043] The sheath 14 is formed, for example, by extrusion coating resin on the outside of the resin layer 12. The sheath 14 in this example has two ribs 14r. The two ribs 14r are provided at point-symmetrical positions on the outer peripheral surface with respect to the center of the sheath 14.

[0044] 〈Number of PC steel materials〉 The number of PC steel materials 1 that make up one PC cable 2 is appropriately set according to the strength level required for the concrete member 100. In one PC cable 2, the combined strength level of all the PC steel materials 1 is, for example, 1860 MPa or more, further 2000 MPa or more, 2200 MPa or more. When the composition of all the PC steel materials 1 is the same, the greater the number of PC steel materials 1, the higher the strength level. The number of PC steel materials 1 is, for example, 2 or more and 37 or less. If the number of PC steel materials 1 is 37 or less, it is easy to arrange the PC cable 2 inside the concrete member 100. The number of PC steel materials 1 may further be 2 or more and 20 or less. The composition of each of the plurality of PC steel materials 1 may be the same or different.

[0045] As shown in FIG. 3, the PC cable 2 in this example is composed of two PC steel materials 1. The number of steel wires 11 that make up the PC steel wire 10 is 19. The seven steel wires 11 arranged at the center of the PC steel wire 10 have the same diameter. Among the twelve steel wires 11 arranged on the outer periphery of the center part, those with a larger diameter and those with a smaller diameter than the steel wires 11 in the center part are alternately arranged around the axis of the PC steel wire 10. The outer diameter of the PC steel wire 10 is 29 mm.

[0046] 〈Arrangement of PC Steel Materials〉 The plurality of PC steel materials 1 are arranged in parallel with each other. Being arranged in parallel means that the plurality of PC steel materials 1 are arranged linearly without being twisted. Compared with the plurality of PC steel materials 1 that are twisted, when the PC steel wire 10 is tensioned, the above-mentioned lateral pressure is less likely to occur in the plurality of PC steel materials 1 arranged in parallel. Therefore, fretting is less likely to occur in the PC steel wire 10, and the fretting fatigue of the PC steel material 1 can be more effectively suppressed.

[0047] In the above example described with reference to FIGS. 1 to 3, the PC steel material 1 is directly embedded in the concrete. As shown in FIGS. 5 to 7, the PC steel material 1 may be inserted into a duct 3 embedded inside the concrete member 100. The duct 3 is arranged inside the concrete member 100 along the X direction. The duct 3 is filled with grout 4. The grout 4 is, for example, cement milk in which cement and water are mixed. The concrete member 100 in this example is divided into a first section 101, a second section 102, and a third section 103 and cast in segments as shown in FIG. 6. In this example, as shown in FIG. 5, a plurality of ducts 3 are provided inside the concrete member 100, and a plurality of PC steel materials 1 are respectively inserted into each duct 3. In FIGS. 5 and 6, it is illustrated that one PC steel material 1 is inserted into each duct 3, but actually, as shown in FIG. 7, a plurality of PC steel materials 1 are inserted into each duct 3. FIG. 6 shows a cross section parallel to the X-Z plane. FIG. 7 shows a cross section orthogonal to the X direction.

[0048] (Duct) The duct 3 is embedded inside the concrete member 100. The duct 3 is a cylindrical member. A plurality of PC steel materials 1 are inserted into the duct 3. The shape of the duct 3 in this example is cylindrical.

[0049] The duct 3 is composed of, for example, resin or metal. The duct 3 made of resin is lightweight and can reduce the weight of the concrete member 100. Also, the duct 3 made of resin does not rust, for example, by reacting with moisture in the concrete or moisture that has penetrated inside the concrete member 100. The resin constituting the duct 3 is, for example, polyethylene resin or polyvinyl chloride resin. The duct 3 in this example is made of polyethylene resin, specifically high-density polyethylene resin. The duct 3 made of polyethylene has high durability. The duct 3 made of metal is less likely to deform or collapse compared to the duct 3 made of resin. The metal constituting the duct 3 is, for example, steel or stainless steel.

[0050] The porosity of the duct 3 is, for example, 30% or more and 60% or less. The porosity of the duct 3 means the ratio of the space in the internal space of the duct 3 where no plurality of PC steel materials 1 are arranged in a cross-section orthogonal to the X direction. That is, the porosity of the duct 3 is the ratio of the space filled with the grout 4 in the internal space of the duct 3. The porosity of the duct 3 is the ratio obtained by dividing the area obtained by subtracting the total cross-sectional area of the plurality of PC steel materials 1 from the cross-sectional area of the internal space of the duct 3 by the cross-sectional area of the internal space of the duct 3. If the porosity of the duct 3 is 30% or more, it is easy to fill the grout 4 in a state where a plurality of PC steel materials 1 are inserted into the duct 3. Also, if the porosity of the duct 3 is 30% or more, a sufficient amount of the grout 4 can be filled, and it is easy for the grout 4 to integrate the plurality of PC steel materials 1 and the duct 3. If the porosity of the duct 3 is 60% or less, it is not necessary to make the duct 3 excessively large or to excessively increase the amount of the grout 4 used. The porosity of the duct 3 may further be 45% or more and 55% or less.

[0051] The inner diameter of the duct 3 is appropriately set according to the number and diameter of the PC steel materials 1 inserted into the duct 3. The inner diameter of the duct 3 is, for example, 60 mm or more and 140 mm or less. If the inner diameter of the duct 3 is 60 mm or more, it is easy to insert a plurality of PC steel materials 1. If the inner diameter of the duct 3 is 140 mm or less, it is easy to miniaturize the duct 3. If the duct 3 is small, it is easy to install the duct 3 inside the concrete member 100. The inner diameter of the duct 3 may be, for example, 70 mm or more and 130 mm or less. The thickness of the duct 3 is appropriately set so that the duct 3 has a predetermined strength. The thickness of the duct 3 is, for example, 4 mm or more and 10 mm or less, and further 5 mm or more and 8 mm or less.

[0052] (Grout) The grout 4 is filled in the gap between the duct 3 and the plurality of PC steel materials 1. When the grout 4 hardens, the grout 4 adheres to the plurality of PC steel materials 1 and the duct 3, and the plurality of PC steel materials 1 and the duct 3 are integrated. By integrating the plurality of PC steel materials 1 and the duct 3, the plurality of PC steel materials 1 and the concrete member 100 are integrated. The load-bearing performance of the concrete member 100 in the state where the plurality of PC steel materials 1 and the concrete member 100 are integrated is improved. Therefore, the bearing capacity of the concrete member 100 can be increased, and cracks are less likely to occur in the concrete member 100.

[0053] The plurality of PC steel materials 1 inserted into one duct 3 correspond to the above-described PC cable 2. The number of PC steel materials 1 inserted into one duct 3 is, for example, 2 or more and 37 or less. If the number of PC steel materials 1 is 37 or less, it is easy to insert the plurality of PC steel materials 1 into the duct 3. The number of PC steel materials 1 may be further 2 or more and 20 or less. The configuration of each of the plurality of PC steel materials 1 may be the same or different. When the duct 3 is filled with the grout 4, by the hardening of the resin layer 12 of each PC steel material 1, the uneven portions formed on the outer peripheral surface of the sheath 14 of each PC steel material 1 mesh with the surrounding grout 4, whereby each PC steel material 1 is integrated with the grout 4.

[0054] In the example shown in FIG. 7, two PC steel materials 1 are arranged in the duct 3. The configuration of the PC steel material 1 is the same as the configuration of the PC steel material 1 shown in FIG. 3. The inner diameter of the duct 3 is 80 mm. The porosity of the duct 3 is 57.0%.

[0055] FIG. 8 shows an example in which three PC steel materials 1 are arranged in the duct 3. In the example shown in FIG. 8, the number of steel wires 11 constituting the PC steel wire 10 is 19. The seven steel wires 11 arranged at the center of the PC steel wire 10 have the same diameter. The twelve steel wires 11 arranged on the outer periphery of this center part are alternately arranged around the axis of the PC steel wire 10 with those having a larger diameter and those having a smaller diameter than the steel wires 11 at the center part. The outer diameter of the PC steel wire 10 is 25.4 mm. The inner diameter of the duct 3 is 80 mm. The porosity of the duct 3 is 50.5%.

[0056] FIG. 9 shows an example in which seven PC steel materials 1 are arranged in the duct 3. In the example shown in FIG. 9, the number of steel wires 11 constituting the PC steel wire 10 is seven. The seven steel wires 11 have the same diameter. The outer diameter of the PC steel wire 10 is 15.2 mm. The inner diameter of the duct 3 is 80 mm. The porosity of the duct 3 is 56%.

[0057] FIG. 10 shows an example in which 19 PC steel materials 1 are arranged in the duct 3. In the example shown in FIG. 10, the number of steel wires 11 constituting the PC steel wire 10 is 19. The seven steel wires 11 arranged at the center of the PC steel wire 10 have the same diameter. Twelve steel wires 11 arranged on the outer periphery of the center part are alternately arranged around the axis of the PC steel wire 10 in a thicker diameter and a thinner diameter than the steel wires 11 in the center part. The outer diameter of the PC steel wire 10 is 17.8 mm. The inner diameter of the duct 3 is 127 mm. The porosity of the duct 3 is 38%.

[0058] <Fixing structure> (Fastener) With reference to FIGS. 11 and 12, an example of the fixing structure will be described. In the example shown in FIGS. 11 and 12, similar to the above-described example described with reference to FIGS. 5 to 7, a plurality of PC steel materials 1 are inserted into the duct 3 and the duct 3 is filled with grout 4. For the configuration of each part of the PC steel material 1, refer to FIG. 7 as necessary. The fastener 5 is a member that fixes a plurality of PC steel wires 10 to the end face of the concrete member 100. The fastener 5 includes a plurality of wedges 51, an anchor disk 52, and a cap 53. The fastener 5 is attached to the ends of a plurality of PC steel materials 1. The respective ends of the plurality of PC steel materials 1 protrude from the end face of the concrete member 100. FIG. 11 shows a cross section parallel to the X-Y plane. FIG. 12 shows a cross section parallel to the X-Z plane. In FIGS. 11 and 12, the hatching of the grout 4 and the concrete member 100 is omitted.

[0059] 〈Wedge〉 The wedge 51 individually grips the end portions of each of the plurality of PC steel materials 1. The number of wedges 51 is the same as the number of PC steel materials 1. The end portions of the PC steel materials 1 gripped by the wedges 51 have the resin layer 12 and the sheath 14 removed, and the PC steel wire 10 is exposed. The wedge 51 grips the outer peripheral surface of the PC steel wire 10 exposed from the resin layer 12 and the sheath 14. The shape of the wedge 51 is a frustum of a cone. On the inner peripheral surface of the wedge 51, irregularities for gripping the PC steel wire 10 are formed. The wedge 51 is configured by combining a plurality of divided pieces. In this example, the number of divided pieces is 2. The material of the wedge 51 is, for example, steel.

[0060] At the end portion of the PC steel material 1, the end portion of the PC steel wire 10 is covered with the resin layer 12 and the sheath 14 up to the portion gripped by the wedge 51. Therefore, the corrosion resistance at the end portion of the PC steel wire 10 can be ensured. As will be described later, among the end portions of the PC steel wire 10, the portion protruding from the wedge 51 is covered with the rust preventive material 58 filled in the cap 53. Therefore, the corrosion resistance is ensured over the entire length of the PC steel wire 10.

[0061] 〈Anchor disk〉 The anchor disk 52 has a plurality of wedge holes 52a into which each of the plurality of wedges 51 is individually fitted. The wedge holes 52a penetrate the anchor disk 52. The wedge holes 52a are frustum-shaped holes corresponding to the shape of the wedge 51. When the wedge 51 is fitted into the wedge hole 52a, the PC steel wire 10 is tightened by the wedge 51. The shape of the anchor disk 52 is a disk shape. The material of the anchor disk 52 is, for example, steel.

[0062] The anchor disk 52 is disposed on the end face of the concrete member 100. The anchor disk 52 is fixed to the first end face of the rib cast anchor 54 described later. The anchor disk 52 transmits the tension force of the tensioned PC steel wire 10 to the rib cast anchor 54 as a compressive force.

[0063] 〈Rib Cast Anchor〉 The rib cast anchor 54 transmits the compressive force transmitted from the anchor disk 52 to the concrete member 100. The rib cast anchor 54 is formed in a frustum-shaped cylindrical shape. Inside the rib cast anchor 54, the ends of a plurality of PC steel materials 1 are inserted. The material of the rib cast anchor 54 is, for example, steel or cast iron.

[0064] The rib cast anchor 54 is embedded in the end of the concrete member 100. The rib cast anchor 54 has a first end face to which the anchor disk 52 is fixed and a second end face to which a trampet sheath 55 described later is connected. The first end face of the rib cast anchor 54 is exposed from the end face of the concrete member 100 and is in contact with the peripheral edge of the anchor disk 52.

[0065] 〈Trampet Sheath〉 The trampet sheath 55 is disposed between the rib cast anchor 54 and the duct 3. The trampet sheath 55 is formed in a frustum-shaped cylindrical shape. The trampet sheath 55 has a first end connected to the rib cast anchor 54 and a second end opposite to the first end. The inner diameter of the first end of the trampet sheath 55 is larger than the inner diameter of the second end. That is, the trampet sheath 55 flares from the second end toward the first end. Inside the trampet sheath 55, the ends of a plurality of PC steel materials 1 are inserted. The plurality of PC steel materials 1 disposed in the trampet sheath 55 are arranged so as to spread from the second end toward the first end.

[0066] In this example, a joint sheath 56 for connecting between the trampet sheath 55 and the duct 3 is provided. The joint sheath 56 is formed in a cylindrical shape. Inside the joint sheath 56, the ends of a plurality of PC steel materials 1 drawn from the end of the duct 3 are inserted. The joint sheath 56 is connected so as to partially overlap the outer peripheral surface of the second end of the trampet sheath 55 and the outer peripheral surface of the end of the duct 3.

[0067] On the outer peripheral surface of the joint sheath 56, a grout injection port 57 shown in FIG. 12 is provided. The grout injection port 57 is for injecting the grout 4 into the joint sheath 56. A hose (not shown) is attached to the grout injection port 57. The hose extends from the grout injection port 57 to the outside of the concrete member 100.

[0068] The rib cast anchor 54, the trumpet sheath 55, and the joint sheath 56 are arranged in a formwork when the concrete member 100 is placed, and are buried together with the duct 3 inside the concrete member 100.

[0069] 〈Cap〉 The cap 53 covers the anchor disk 52, a plurality of wedges 51 exposed from the anchor disk 52, and the respective end portions of a plurality of PC steel wire ropes 10 protruding from the anchor disk 52. The inside of the cap 53 is filled with an anti-rust material 58. The anti-rust material 58 has a function of preventing corrosion of the anchor disk 52, each wedge 51, and the end portions of the PC steel wire ropes 10 protruding from each wedge 51. The material of the cap 53 is, for example, steel. The anti-rust material 58 is composed of, for example, grout or resin. The resin constituting the anti-rust material 58 is, for example, an epoxy resin. In FIGS. 11 and 12, the hatching of the anti-rust material is omitted.

[0070] The PC steel wire rope 10 is covered with the resin layer 12 and the sheath 14 except inside the cap 53. The PC steel wire rope 10 inside the cap 53 is protected against corrosion by the anti-rust material 58. From the process of preparing the PC steel material 1 to the process of fixing the PC steel wire rope 10, the PC steel wire rope 10 is protected against corrosion without being exposed to the outside over its entire length.

[0071] As shown in FIG. 12, the cap 53 of this example has an injection port 53a and a discharge port 53b for filling the anti-rust material 58 inside the cap 53. The anti-rust material 58 is injected from the injection port 53a. When the excess anti-rust material 58 is discharged from the discharge port 53b, the filling of the anti-rust material 58 into the cap 53 is completed.

[0072] The cap 53 in this example is fixed to the anchor disk 52 by bolts 59 shown in FIGS. 11 and 12. As shown in FIG. 13, the anchor disk 52 is formed with bolt holes 59a into which the tip ends of the bolts 59 are screwed.

[0073] <Method for manufacturing the fixing structure> The fixing structure can be manufactured by the manufacturing method shown below. The manufacturing method of the fixing structure includes the first to third steps shown below. Each step will be described in detail.

[0074] (First step) The first step is a step of arranging a plurality of PC steel materials 1 having wires 10 made of PC steel inside the concrete member 100. When the PC steel material 1 is directly embedded in the concrete as shown in FIGS. 1 and 2, the first step is performed as follows. Assemble a formwork for pouring concrete. Place the PC cable 2 composed of a plurality of PC steel materials 1 inside the formwork. After placing the PC cable 2, pour concrete into the formwork and place the concrete member 100. After the concrete has hardened, remove the formwork.

[0075] When the PC steel material 1 is arranged in the duct 3 as shown in FIGS. 5 and 6, the manufacturing method of the fixing structure includes a step of embedding the duct 3 inside the concrete member 100 before the first step. In the step of embedding the duct 3, after assembling the formwork, the duct 3 is arranged inside the formwork. After arranging the duct 3, concrete is poured into the formwork to cast the concrete member 100. In the first step, a plurality of PC steel materials 1 are inserted into the duct 3 provided in the concrete member 100. When inserting a plurality of PC steel materials 1 into the duct 3, the plurality of PC steel materials 1 may be inserted collectively or the PC steel materials 1 may be inserted individually one by one. The insertion work of the PC steel material 1 is performed, for example, by using a winch to pull the PC steel material 1 into the duct 3. When inserting a plurality of PC steel materials 1 into the duct 3 collectively, for example, the plurality of PC steel materials 1 are gathered by fixing a fitting to the end. A wire rope is attached to this fitting. By pulling this wire rope with a winch, the plurality of PC steel materials 1 are collectively pulled into the duct 3. By inserting a plurality of PC steel materials 1 collectively, the plurality of PC steel materials 1 can be inserted efficiently.

[0076] In the first step, for example, a plurality of PC steel materials 1 are arranged in parallel with each other.

[0077] As shown in FIG. 5, when a plurality of ducts 3 are provided in the concrete member 100, the adjacent ducts 3 are arranged at an interval of a certain value or more. Since the ducts 3 are arranged at an interval, the space between the ducts 3 is easily filled with concrete. Also, since the ducts 3 are arranged at an interval, it is easy to secure a space into which the vibrator is inserted. The vibrator is a machine used when casting the concrete member 100. The vibrator is inserted into the concrete poured into the formwork and vibrates the concrete in the uncured state to remove unnecessary bubbles from the concrete. The interval between the ducts 3 is, for example, 40 mm or more.

[0078] When the concrete member 100 is placed in sections, as shown in FIG. 6, the placing sections are divided into a first section 101, a second section 102, and a third section 103, and placed for each section. In the sectional placing, a duct 3 having a length extending over the total length of a plurality of placing sections is prepared. The duct 3 is arranged in the formwork, and concrete is sequentially placed around the duct 3.

[0079] The PC steel material 1 has a length corresponding to the total length of the concrete member 100. In the configuration in which the PC steel material 1 is arranged in the duct 3, the plurality of PC steel materials 1 may be prepared in accordance with the timing when the placing of the concrete member 100 is completed. Therefore, it is possible to avoid the resin layer 12 from curing before the tensioning of the PC steel wire 10. For example, in sectional placing, the period required for placing concrete from the first placing section to the final placing section is long. In this example, the duct 3 is embedded inside the concrete member 100 by placing concrete in all the placing sections. Thereafter, the plurality of PC steel materials 1 are inserted into the duct 3. With such a configuration, even if the period until the sectional placing of the concrete member 100 is completed is long, it is possible to tension the PC steel wire 10 by preparing immediately before inserting the PC steel material 1 into the duct 3. On the other hand, in the configuration in which the PC steel material 1 is directly embedded in the concrete, it is necessary to arrange the PC steel material 1 in the formwork when placing the concrete member 100. Therefore, there is a possibility that the resin mixture may cure before the sectional placing of the concrete member 100 is completed, and the PC steel wire 10 cannot be tensioned.

[0080] Further, when the PC steel material 1 is arranged in the duct 3, the manufacturing method of the fixing structure includes a step of filling the duct 3 with grout 4 after the first step. The filling operation of the grout 4 is performed in a state where a plurality of PC steel materials 1 are inserted into the duct 3. By filling the duct 3 with the grout 4, the duct 3 and the plurality of PC steel materials 1 are integrated by the grout 4. That is, the concrete member 100 and the plurality of PC steel materials 1 are integrated. For the grout 4, for example, cement milk is used.

[0081] (Second step) The second step is the step of tensioning wire 10 from the PC steel. When tensioning wire 10 from a plurality of PC steels, wire 10 from the plurality of PC steels may be tensioned collectively and simultaneously, or wire 10 from each PC steel may be tensioned individually one by one. The tensioning operation of wire 10 from the PC steel is performed by pulling wire 10 from the PC steel using a jack. The tensioning operation of wire 10 from the PC steel is performed after the concrete has hardened. By tensioning wire 10 from a plurality of PC steels collectively, the working time can be shortened, and wire 10 from the plurality of PC steels can be tensioned efficiently. Also, by tensioning wire 10 from a plurality of PC steels collectively, variations in the tension of wire 10 from each PC steel are less likely to occur.

[0082] The step of filling the grout 4 into the above-described duct 3 and the step of tensioning wire 10 from the PC steel may be interchanged. That is, the filling of the grout 4 may be performed before the tensioning of wire 10 from the PC steel, or may be performed after the tensioning of wire 10 from the PC steel.

[0083] (Third step) The third step is the step of fixing the tensioned wire 10 from the PC steel to the concrete member 100. When fixing wire 10 from a plurality of PC steels, wire 10 from the plurality of PC steels may be fixed collectively and simultaneously, or wire 10 from each PC steel may be fixed individually one by one. The fixing operation of the PC steel material 1 is to fix wire 10 from the PC steel to the end face of the concrete member 100 using the fixing tool 5.

[0084] In this example, wire 10 from a plurality of PC steels is fixed collectively and simultaneously by the above-described fixing tool 5. By fixing wire 10 from a plurality of PC steels collectively, the working time can be shortened, and wire 10 from the plurality of PC steels can be fixed efficiently. Also, by performing the tensioning and fixing of wire 10 from a plurality of PC steels simultaneously, it is possible to suppress uneven loads being applied to components such as the anchor disk 52.

[0085] <Intermediate fixing structure> Referring to FIG. 14, an example of an intermediate fixing structure for connecting a second PC steel material 1B to a first PC steel material 1A fixed to a first concrete member 100A will be described. The second PC steel material 1B is a PC steel material fixed to a second concrete member (not shown). In FIG. 14, one each of the first PC steel material 1A and the second PC steel material 1B is shown, but actually, similar to the fixing structure described above with reference to FIGS. 11 and 12, the number of the first PC steel material 1A and the second PC steel material 1B is two each. A first fixture 5A is attached to the end of the first PC steel material 1A. The first fixture 5A includes a first wedge 51A and a first anchor disk 52A. A second fixture 5B is attached to the end of the second PC steel material 1B. The second fixture 5B includes a second wedge 51B and a second anchor disk 52B. The configurations of the first wedge 51A and the first anchor disk 52A, and the second wedge 51B and the second anchor disk 52B are generally the same as the configurations of the wedge 51 and the anchor disk 52 in the fixture 5 described above. At each end of the first PC steel material 1A and the second PC steel material 1B, the end of the PC steel wire 10 gripped by the wedge 51 is exposed from the resin layer 12 and the sheath 14.

[0086] The intermediate fixing structure shown in FIG. 14 includes a spacer 61, a coupler sleeve 62, and a coupler sheath 63. In the example shown in FIG. 14, an anchor plate 60 is embedded in the end of the first concrete member 100A. The first anchor disk 52A is arranged to contact the anchor plate 60.

[0087] The end of the PC steel wire 10 in the first PC steel material 1A and the end of the PC steel wire 10 in the second PC steel material 1B are arranged to abut against each other. The spacer 61 is a member arranged to surround the end of the PC steel wire 10 in the first PC steel material 1A and the end of the PC steel wire 10 in the second PC steel material 1B from the outside. In this example, the spacer 61 is fixed to the second anchor disk 52B by bolts 61a.

[0088] The coupler sleeve 62 is a cylindrical member arranged to surround the first anchor disk 52A and the second anchor disk 52B from the outside. The coupler sleeve 62 has a first end where the first anchor disk 52A is disposed and a second end where the second anchor disk 52B is disposed. The first end of the coupler sleeve 62 is open so that the first anchor disk 52A can be inserted. An internal thread portion 62a is provided on the inner peripheral surface of the first end of the coupler sleeve 62. An external thread portion 52b is provided on the outer peripheral surface of the first anchor disk 52A. The coupler sleeve 62 and the first anchor disk 52A are connected by coupling the internal thread portion 62a and the external thread portion 52b. A wall surface that contacts the end face of the second anchor disk 52B is provided at the second end of the coupler sleeve 62. The wall surface of the second end supports the tension acting on the wire 10 from the PC steel of the second PC steel material 1B. An opening 62b into which the end of the second PC steel material 1B is inserted is formed in this wall surface. The inner diameter of the opening 62b is a dimension corresponding to the outer diameter of the second PC steel material 1B, that is, the outer diameter of the sheath 14, and is smaller than the opening at the first end of the coupler sleeve 62.

[0089] The coupler sheath 63 is a cylindrical member in which the coupler sleeve 62 is housed. The coupler sheath 63 has a first end connected to the anchor plate 60 and a second end provided with an opening 63a into which the end of the second PC steel material 1B is inserted. The inner diameter of the opening 63a is larger than the outer diameter of the second PC steel material 1B and smaller than the opening at the first end of the coupler sheath 63. The inner diameter of the first end of the coupler sheath 63 is larger than the outer diameter of the coupler sleeve 62, and the coupler sheath 63 is longer than the coupler sleeve 62. A water stop material 63b is disposed between the opening 63a and the second PC steel material 1B. The first end of the coupler sheath 63 is fixed to the anchor plate 60 by bolts (not shown).

[0090] The coupler sheath 63 is filled with a rust preventive material (not shown). The rust preventive material is filled between the coupler sleeve 62 and the coupler sheath 63. The same material as the above-described rust preventive material 58 can be used for the rust preventive material. The filling operation of the rust preventive material is performed after the coupler sheath 63 is attached to the outside of the coupler sleeve 62. The coupler sheath 63 has an inlet (not shown) for filling the rust preventive material into the coupler sheath 63. The inlets are provided at the second end of the coupler sheath 63 and on the outer peripheral surface of the coupler sheath 63, respectively.

[0091] The coupler sheath 63 is provided with a float 64 for checking the filling state of the rust preventive material in the coupler sheath 63. When the rust preventive material fills the coupler sheath 63, the rust preventive material is filled into the float 64. By visually checking the situation inside the float 64 from the outside of the float 64, it is possible to check whether the coupler sheath 63 is filled with the rust preventive material. Three floats 64 are provided at the upper part of the coupler sheath 63.

[0092] The assembly procedure of the above-described intermediate fixing structure will be described. After tensioning the PC wire 10 from the PC steel of the first PC steel member 1A, the first fixing tool 5A is attached to the end of the tensioned PC wire 10. The coupler sheath 63 and the coupler sleeve 62 are sequentially fitted onto the outer periphery of the second PC steel member 1B, and the coupler sheath 63 and the coupler sleeve 62 are temporarily placed at a position away from the end of the second PC steel member 1B (the right side in FIG. 14). The operation of arranging the coupler sheath 63 and the coupler sleeve 62 is performed before the second fixing tool 5B is attached to the end of the PC wire 10 in the second PC steel member 1B. After attaching the second fixing tool 5B to the end of the PC wire 10 in the second PC steel member 1B, the spacer 61 is fixed to the second anchor disk 52B. The end of the PC wire 10 in the second PC steel member 1B is inserted into the spacer 61. The coupler sleeve 62 is moved in the direction approaching the anchor plate 60, and the second anchor disk 52B and the first anchor disk 52A are sequentially stored in the coupler sleeve 62 from the first end of the coupler sleeve 62. The female screw portion 62a of the coupler sleeve 62 is coupled to the male screw portion 52b of the first anchor disk 52A to fix the coupler sleeve 62 to the outside of the second anchor disk 52B and the first anchor disk 52A. By connecting the coupler sleeve 62 to the first anchor disk 52A, the end of the PC wire 10 in the first PC steel member 1A is inserted into the spacer 61. After connecting the coupler sleeve 62, the coupler sheath 63 is moved in the direction approaching the anchor plate 60, and the coupler sheath 63 is attached to the outside of the coupler sleeve 62. The first end of the coupler sheath 63 is fixed to the anchor plate 60. After attaching the coupler sheath 63, the inside of the coupler sheath 63 is filled with a rust preventive material. The filling state of the rust preventive material is confirmed by visually observing the situation inside the float 64 from the outside of the float 64.

Explanation of Signs

[0093] 1 PC steel member 1A First PC steel member, 1B Second PC steel member 10 PC wire 11 Steel wire 12 Resin layer 14 Sheath, 14r Rib 2 PC Cable 3 Duct 4 Grout 5 Fastener 51 Wedge 52 Anchor Disk 52a Wedge Hole 53 Cap 53a Injection Port, 53b Discharge Port 54 Rib Cast Anchor 55 Trumpet Sheath 56 Joint Sheath 57 Grout Injection Port 58 Rust Preventive 59 Bolt 59a Bolt Hole 5A First Fastener, 5B Second Fastener 51A First Wedge, 51B Second Wedge 52A First Anchor Disk, 52B Second Anchor Disk 52b Male Thread Portion 60 Anchor Plate 61 Spacer 61a Bolt 62 Coupler Sleeve 62a Female Thread Portion, 62b Opening 63 Coupler Sheath 63a Opening, 63b Water Stop Material 64 Float 100 Concrete Member, 100A First Concrete Member 101 First Section, 102 Second Section, 103 Third Section

Claims

1. A plurality of PC steel bars disposed inside a concrete member, and a fixture for fixing the plurality of PC steel bars to the concrete member, wherein each of the plurality of PC steel bars comprises a PC steel wire fixed to an end face of the concrete member in a tensioned state, a resin layer covering an outer peripheral surface of the PC steel wire, and a sheath covering an outside of the resin layer, the fixture comprising a plurality of wedges for gripping respective end portions of the PC steel wire exposed from the resin layer and the sheath, and an anchor disk having a plurality of wedge holes into which the plurality of wedges are individually fitted, a fixing structure.

2. The fixing structure according to claim 1, wherein the plurality of PC steel bars are arranged in parallel with each other.

3. Furthermore, a duct embedded inside the concrete member and into which the plurality of PC steel bars are inserted, and grout filled in a gap between the duct and the plurality of PC steel bars, the fixing structure according to claim 1 or claim 2.

4. A step of arranging a plurality of PC steel bars having PC steel wires inside a concrete member, a step of tensioning the PC steel wires, and a step of fixing the PC steel wires to an end face of the concrete member by a fixture, wherein each of the plurality of PC steel bars comprises a resin layer covering an outer peripheral surface of the PC steel wire, and a sheath covering an outside of the resin layer, the resin layer being cured after tensioning of the PC steel wire, the fixture comprising a plurality of wedges for gripping respective end portions of the PC steel wire exposed from the resin layer and the sheath, and an anchor disk having a plurality of wedge holes into which the plurality of wedges are individually fitted, a method for manufacturing a fixing structure.

5. In the step of arranging the plurality of PC steel bars, the plurality of PC steel bars are arranged in parallel with each other, the method for manufacturing a fixing structure according to claim 4.

6. Before the step of arranging the plurality of PC steel bars, a step of embedding a duct inside the concrete member, and after the step of arranging the plurality of PC steel bars, a step of filling the duct with grout, wherein in the step of arranging the plurality of PC steel bars, the plurality of PC steel bars are inserted into the duct all at once, the method for manufacturing a fixing structure according to claim 4 or claim 5.

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