Cable structure and method for manufacturing cable structure

Abstract

To provide a new cable structure in which a tendon is installed in an insertion hole provided in a concrete structure of a bridge.SOLUTION: A cable structure comprises: a metal pipe disposed in an insertion hole provided in a concrete structure of a bridge; a resin pipe disposed in the metal pipe; a first filler disposed between the metal pipe and the resin pipe; and a tendon disposed in the resin pipe.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a cable structure and a method for manufacturing a cable structure. [Background technology]

[0002] Patent Document 1 describes an outer cable fixing structure for fixing an end of an outer cable to a cross beam in a prestressed concrete bridge in which an outer cable is inserted through an outer cable insertion hole that penetrates the cross beam in the bridge axis direction, as follows: The fixing body is attached to one end face of the cross girder in the bridge axis direction via a filler layer, the fixing body comprises a first tubular member for inserting the external cable therethrough, and a precast concrete block cast so as to bury the first tubular member; The present invention discloses an external cable anchoring structure characterized in that the precast concrete block is made of high-strength fiber-reinforced concrete. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-263879 A Summary of the Invention [Problem to be solved by the invention]

[0004] In prestressed concrete bridges, it has been conventional to provide spare holes, which are insertion holes for inserting tendons into cross beams, etc., in consideration of the need to replace tendons or place additional tendons for reinforcement in widening work and the like after construction is completed (see Patent Document 1).

[0005] Additional tendons are generally installed in the reserve holes via plastic pipes, but the size of the reserve holes may be large compared to the size of the tendons, resulting in a gap between the plastic pipe and the reserve holes, and the size of the gap may become large.

[0006] Also, when installing tendons in new prestressed concrete bridges, the tendons are installed in the insertion holes via plastic pipes so that they can be easily replaced when they deteriorate over time or are damaged, etc. Even when installing tendons in new prestressed concrete bridges, gaps can sometimes occur between the plastic pipes and the insertion holes.

[0007] If a gap occurs between the plastic pipe and the insertion hole, depending on the size of the gap, when force is applied to the tendon installed in the insertion hole, the tendon or plastic pipe may vibrate or displace, which may cause damage to the insertion hole or the bridge structure. Also, when tension is applied to the tendon, a force may be applied to the plastic pipe in tapered areas, causing it to expand outward. For this reason, depending on the size of the gap between the plastic pipe and the insertion hole, the insertion hole may not be able to suppress the expansion of the plastic pipe, which may cause the plastic pipe to be damaged.

[0008] Therefore, an object of the present disclosure is to provide a new cable structure in which a tendon is installed in an insertion hole provided in a concrete structure of a bridge. [Means for solving the problem]

[0009] The cable structure of the present disclosure includes a metal tube disposed in an insertion hole provided in a concrete structure of a bridge; A resin pipe disposed within the metal pipe; a first filler disposed between the metal pipe and the resin pipe; and a tendon disposed within the resin pipe. Effect of the Invention

[0010] According to the present disclosure, it is possible to provide a new cable structure in which a tendon is installed in an insertion hole provided in a concrete structure of a bridge. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a cross-sectional view taken along a plane passing through tendons in a bridge including a cable structure according to one embodiment of the present disclosure. [Diagram 2] FIG. 2 is an enlarged view of area A in FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line CC in FIG. [Figure 4] FIG. 4 is an explanatory diagram of a tendon having a corrosion protection coating. [Figure 5A] FIG. 5A is an explanatory diagram of a rubber sheet. [Figure 5B] FIG. 5B is a side view of the rubber sheet shown in FIG. 5A. [Figure 6] FIG. 6 is a cross-sectional view taken along line CC in FIG. 2 when the cable structure has a first release material and a second release material. [Figure 7A] FIG. 7A is a flow diagram of a method for manufacturing a cable structure according to one embodiment of the present disclosure. [Figure 7B] FIG. 7B is a flow diagram of a method for manufacturing a cable structure according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The embodiments for carrying out the invention are described below.

[0013] [Description of the embodiments of the present disclosure] First, the embodiments of the present disclosure will be described. In the following description, the same or corresponding elements are denoted by the same reference numerals, and the same description thereof will not be repeated.

[0014] (1) A cable structure according to one aspect of the present disclosure includes: a metal tube disposed in an insertion hole provided in a concrete structure of a bridge; A resin pipe disposed within the metal pipe; a first filler disposed between the metal pipe and the resin pipe; and a tendon disposed within the resin pipe.

[0015] According to a cable structure according to an aspect of the present disclosure, a new cable structure can be provided in which a first filler is disposed between a resin tube in which a tendon is installed and an insertion hole.

[0016] According to a cable structure according to an aspect of the present disclosure, by disposing a first filler between a metal pipe and a plastic pipe, the gap between the metal pipe and the plastic pipe can be filled with the first filler. Therefore, even if a force is applied to the tendon, the tendon and the plastic pipe can be restricted from vibrating or displacing, and damage to the insertion hole and the bridge structure can be prevented. Furthermore, even if an outward expanding force is applied to the plastic pipe when tension is applied to the tendon installed in the plastic pipe, since the first filler is disposed around the plastic pipe, the expansion of the plastic pipe can be suppressed by the first filler, and damage to the plastic pipe can be prevented.

[0017] (2) In (1), the tension member is gripped by a fastener at a first end of the insertion hole, The insertion hole may further include a rubber sheet disposed along an outer periphery of the resin tube at a second end located opposite to the first end.

[0018] Since the tension material is not gripped by the fixing device at the second end of the insertion hole, when an external force is applied, it is prone to vibration, displacement, etc. near the second end of the insertion hole.

[0019] A cable structure according to one embodiment of the present disclosure has a rubber sheet arranged along the outer periphery of the resin tube at the second end of the insertion hole, so that even if force is applied to the tensioning material, it is possible to prevent the metal tube, the first filler, etc. from being damaged by the force applied to them.

[0020] (3) In the configuration of (2), the metal tube is exposed from the insertion hole at the second end of the insertion hole, The first filler may also be disposed in at least a part of the portion of the metal pipe exposed from the insertion hole.

[0021] Since the tension material is not gripped by the fixing device at the second end of the insertion hole, when an external force is applied, it is prone to vibration, displacement, etc. near the second end of the insertion hole.

[0022] Therefore, by configuring the metal tube to be exposed from the insertion hole at the second end of the insertion hole, when an external force is applied to the tensioning material, vibration and displacement of the tensioning material can be suppressed, and damage to the bridge structure, etc. can be prevented.

[0023] Since the first filler is filled in at least a part of the portion of the metal pipe exposed from the insertion hole, vibration and displacement of the tendon can be suppressed even if force is applied to the tendon at the second end of the insertion hole, and therefore damage to the metal pipe or the like due to vibration of the tendon can be prevented in the vicinity of the second end of the insertion hole.

[0024] (4) In any one of (1) to (3), a first release material may be disposed on the outer surface of the resin tube.

[0025] After installation, the tendons may need to be replaced if they deteriorate over time or if they are damaged by external forces, etc. By disposing the first release material on the outer surface of the plastic pipe, the tendons installed in the insertion holes can be easily removed together with the plastic pipe, making it easy to replace the tendons, etc.

[0026] (5) In any one of (1) to (4), a second release material may be disposed on the inner surface of the metal tube.

[0027] By arranging the second release material on the inner surface of the metal pipe, it becomes possible to easily remove the first filler, the resin pipe, and the tensioning material from the metal pipe, making it easy to replace the tensioning material, etc.

[0028] (6) In any one of (1) to (5), the cable may further include a second filler disposed between the tendon and the resin pipe.

[0029] By further including a second filler disposed between the tendon and the plastic pipe, it is possible to suppress vibration and displacement of the tendon inside the plastic pipe even when an external force is applied to the tendon, thereby preventing damage to the tendon due to friction between the tendons and damage to the plastic pipe due to displacement of the tendon.

[0030] (7) In any one of (1) to (6), the tendon may have a corrosion-resistant coating on its surface.

[0031] By providing the tendon with an anticorrosive coating on its surface, the tendon can be prevented from corroding and other problems and its durability can be increased.

[0032] (8) A method for manufacturing a cable structure according to an aspect of the present disclosure includes: a resin pipe installation step of installing a resin pipe in a metal pipe disposed in an insertion hole provided in a concrete structure of a bridge; and a first filler filling step of filling a gap between the metal pipe and the resin pipe with a first filler.

[0033] According to the manufacturing method for a cable structure according to one aspect of the present disclosure, a new cable structure can be manufactured in which a first filler is disposed between a resin tube in which a tendon is installed and an insertion hole.

[0034] According to the manufacturing method of the cable structure according to one aspect of the present disclosure, a structure in which the first filler is disposed between the metal pipe and the resin pipe can be obtained by carrying out the resin pipe installation step and the first filler filling step. By disposing the first filler between the metal pipe and the resin pipe, the gap between the metal pipe and the resin pipe can be filled with the first filler. Therefore, even if a force is applied to the tendon, the tendon and the resin pipe can be restricted from vibrating or displacing, and the insertion hole and the bridge frame can be prevented from being damaged. In addition, even if an outward expanding force is applied to the resin pipe when the tendon is installed in the resin pipe and tension is introduced to the tendon, the first filler is disposed around the resin pipe, so that the expansion of the resin pipe can be suppressed by the first filler, and the resin pipe can be prevented from being damaged.

[0035] (9) In the method according to (8), in the first filler filling step, the first filler is supplied from a supply port connected to the gap between the metal pipe and the resin pipe; The gas in the gap between the metal pipe and the resin pipe may be exhausted from an exhaust port provided separately from the supply port at a position higher than the supply port.

[0036] By filling the first filler through the supply port while discharging gas between the metal pipe and the resin pipe through an exhaust port located at a higher position than the supply port, the first filler can be filled without any gaps between the metal pipe and the resin pipe.

[0037] (10) In the method (8) or (9), a tendon installation step of installing a tendon in the plastic pipe; The method may further include a tensioning step of applying tension to the tendons.

[0038] By carrying out the tendon installation step and tensioning step, a cable structure can be obtained in which tendons with tension introduced into the resin pipe are arranged.

[0039] [Details of the embodiment of the present disclosure] A specific example of a cable structure and a method for manufacturing a cable structure according to an embodiment of the present disclosure (hereinafter referred to as the present embodiment) will be described below with reference to the drawings. Note that the present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0040] In this specification, there are cases where the names of components are described with '1', '2', etc. added to them, such as 'first end', 'second end', 'first metal pipe end', and 'second metal pipe end'. '1', '2', etc. are written merely to distinguish between the components and to prevent confusion during description, and do not represent placement, priority, etc. For this reason, when there is no particular risk of confusion, they can be simply written as 'end', 'metal pipe end', etc. [Cable structure] A configuration example of a cable structure of this embodiment will be described. The cable structure of this embodiment means a structure in which tension members are inserted and fixed via resin pipes into insertion holes provided in concrete structures (concrete members) such as cross beams, bulkheads, and column capitals of a prestressed concrete bridge. For this reason, the cable structure of this embodiment can also be referred to as a cable fixing structure or the like.

[0041] In the cable structure of this embodiment, the entire tendon except for the end portion may be disposed inside the concrete structure. The cable structure of this embodiment may also have an external cable structure in which at least a portion of the tendon is disposed outside the concrete structure. In this case, the cable structure of this embodiment may also be referred to as an external cable structure, an external cable anchoring structure, etc.

[0042] Fig. 1 is a cross-sectional view of a bridge 10 including a cable structure of this embodiment, taken along a plane passing through a tendon 11. The X-axis in Figs. 1 and 2 is an axis along the bridge axis, and an axis along the length of the bridge. The Y-axis is an axis perpendicular to the bridge axis, and an axis along the width of the bridge. The Z-axis is an axis along the height.

[0043] The tendons 11 of the cable structure of this embodiment shown in Fig. 1 are arranged along the bridge axis. However, the tendons 11 can be arranged according to the direction of the compressive force to be applied to the concrete structure, and are not limited to this form. The tendons 11 pass through deflection sections 13 provided in the lower deck 15, and both ends are inserted into insertion holes 21 (see Fig. 2) provided in the cross beams of the concrete structure 12, and fixed with fasteners.

[0044] The tendons 11 can be disposed within a space 16 located between an upper deck 14 and a lower deck 15, i.e., within the bridge 10.

[0045] In FIG. 1, the bridge piers 17 and other parts are partially omitted.

[0046] Fig. 2 shows an enlarged view of region A in Fig. 1. In the following description, the cable structure of this embodiment will be described using region A. However, insertion holes provided in other concrete structures 12, such as region B, may have the same structure.

[0047] FIG. 3 shows a cross-sectional view taken along line CC in FIG.

[0048] 2 and 3, a cable structure 20 of this embodiment has a metal pipe 22 arranged in an insertion hole 21 of a concrete structure 12 such as a cross beam of a bridge 10, and a resin pipe 23 arranged in the metal pipe 22. The cable structure 20 of this embodiment also has a first filler 24 arranged between the metal pipe 22 and the resin pipe 23, and a tendon 11 arranged in the resin pipe 23.

[0049] Each member of the cable structure 20 of this embodiment will be described below. (Insertion hole) The insertion hole 21 is provided in the concrete structure 12. In Fig. 1, the insertion hole 21 is arranged along the X-axis which is the bridge axis, but is not limited to this form. The insertion hole 21 can be arranged according to the tendon 11 to be arranged in the insertion hole 21.

[0050] The insertion hole 21 is a through hole provided in the concrete structure 12, and is a hole through which the tendon 11 is inserted.

[0051] The insertion hole 21 is a through hole provided in the concrete structure 12, and has a first end 21A that corresponds to an opening exposed from the concrete structure 12, and a second end 21B.

[0052] The shape of the insertion hole 21 is not particularly limited, and may be, for example, bent at one or more points along the longitudinal direction. The cross-sectional shape of the insertion hole 21 in a plane perpendicular to the longitudinal direction is also not particularly limited, and may be, for example, circular. The circular shape includes a perfect circle and an ellipse. The cross-sectional shape of the insertion hole 21 in a plane perpendicular to the longitudinal direction does not need to be constant, and the shape and size may differ depending on the position along the longitudinal direction of the insertion hole 21. (metal tube) The metal pipe 22 is a pipe provided to protect the insertion hole 21, which is a through hole provided in the concrete structure 12, and is provided in advance along the inner surface 211 (see FIG. 3) of the insertion hole 21. The inner surface 211 of the insertion hole 21 and the outer surface 221 of the metal pipe 22 can be configured to be in direct contact with each other.

[0053] The metal pipe 22 is a pipe made of metal, and although the material is not particularly limited, it may be made of, for example, steel in consideration of costs, etc. Therefore, the metal pipe 22 may be, for example, a steel pipe.

[0054] The inner diameter D22 of the metal tube 22 is not particularly limited, but can be, for example, 80 mm or more and 200 mm or less. The inner diameter D22 of the metal tube 22 can be evaluated at any cross section perpendicular to the longitudinal direction of the metal tube 22, and when the cross section is elliptical, the average value of the lengths of the major axis and the minor axis can be the inner diameter D22 of the metal tube 22. The surface of the metal tube 22 may be plated, painted with resin, or the like.

[0055] At the second end 21B of the insertion hole 21, the metal pipe 22 can be configured to be exposed from the insertion hole 21. In other words, at the second end 21B of the insertion hole 21, the metal pipe 22 can be made longer than the insertion hole 21, and the second metal pipe end 22B of the metal pipe 22 can be configured to protrude from the concrete structure 12.

[0056] The metal tube 22 has two longitudinal ends, a first metal tube end 22A and a second metal tube end 22B, and the fixing device 25 for the tendon 11 is provided at the first metal tube end 22A. The second metal tube end 22B is the end of the metal tube 22 that is located opposite the end where the fixing device 25 for the tendon 11 is provided.

[0057] Since the tendon 11 is not gripped by the fixing device 25 at the second end 21B of the insertion hole 21, when an external force is applied, the tendon 11 is prone to vibration, displacement, etc. near the second end 21B of the insertion hole 21. Therefore, by configuring the metal tube 22 to be exposed from the insertion hole 21 at the second end 21B of the insertion hole 21, when an external force is applied to the tendon 11, it is possible to suppress displacement of the tendon 11 and prevent damage to the concrete structure 12, etc. (Resin pipe) The plastic tube 23 is a tube that can be placed around the outer periphery of the tension member 11 to protect the tension member 11 when it is inserted into the insertion hole 21, and also to make it easier to remove the tension member 11 when replacing the tension member 11, etc.

[0058] The material of the resin pipe 23 is not particularly limited, but is preferably made of polyolefin resin, and more preferably made of polyethylene, in consideration of costs, flexibility when inserted into the insertion hole 21, etc. The resin pipe 23 may contain additives, etc., as necessary, in addition to the resin such as polyolefin.

[0059] The outer diameter D23 of the resin pipe 23 may be smaller than the inner diameter D22 of the metal pipe 22, and may be, for example, 70 mm or more and 180 mm or less. The outer diameter D23 of the resin pipe 23 can be evaluated at any cross section perpendicular to the longitudinal direction of the resin pipe 23, and when the cross section is elliptical, the outer diameter D23 of the resin pipe 23 can be the average value of the lengths of the major axis and the minor axis.

[0060] In the cable structure 20 of this embodiment, the resin pipe 23 disposed in the insertion hole 21 can be disposed around the outer periphery of the tendon 11 in one layer. (First filler) The tendon 11 is placed in the insertion hole 21 via a plastic pipe 23. The size of the plastic pipe 23 is selected according to the size of the tendon 11, so if the size of the insertion hole 21 or the metal pipe 22 placed in the insertion hole 21 is large compared to the size of the tendon 11, a gap will be generated between the plastic pipe 23 and the metal pipe 22. For this reason, when force is applied to the tendon 11, there is a risk that the insertion hole 21 or the bridge frame will be damaged.

[0061] Therefore, it is considered to fill the gap between the resin pipe 23 and the metal pipe 22 and fix the resin pipe 23 inside the metal pipe 22. As a method of fixing the resin pipe 23 inside the metal pipe 22, it is considered to place an annular member on the outer periphery of the resin pipe 23. However, the resin pipe 23 may include a portion that is tapered as shown in FIG. 2, for example. Also, the metal pipe 22 and the resin pipe 23 may have a shape that is bent at multiple points along the length. For this reason, it has been difficult to select and install an annular member of an appropriate size.

[0062] Therefore, in the cable structure 20 of this embodiment, as shown in Figs. 2 and 3, the first filler 24 is arranged between the metal tube 22 and the resin tube 23. According to the cable structure 20 of this embodiment, a new cable structure can be obtained in which the first filler 24 is arranged between the resin tube 23 in which the tendon 11 is installed and the insertion hole 21. According to the cable structure 20 of this embodiment, by arranging the first filler 24 between the metal tube 22 and the resin tube 23, the gap between the metal tube 22 and the resin tube 23 can be filled with the first filler 24. Therefore, even if a force is applied to the tendon 11, the tendon 11 and the resin tube 23 are restricted from vibrating or displacing, and the insertion hole 21 and the bridge frame can be prevented from being damaged. Furthermore, even if an outward expanding force is applied to the resin tube 23 when tension is introduced to the tendon 11 installed in the resin tube 23, the expansion of the resin tube 23 can be suppressed by the first filler 24 since the first filler 24 is arranged around the resin tube 23. Therefore, damage to the resin pipe 23 can be prevented.

[0063] The material of the first filler 24 is not particularly limited, and is preferably a material that has fluidity, i.e., a liquid material, when filled between the metal pipe 22 and the resin pipe 23. By using a material that has fluidity when filled, the gap between the metal pipe 22 and the resin pipe 23 can be easily filled regardless of its shape, and it is possible to prevent a gap from remaining between the metal pipe 22 and the resin pipe 23. The first filler 24 is preferably a material that solidifies and becomes solid after being filled between the metal pipe 22 and the resin pipe 23.

[0064] 2, the resin pipe 23 may have a tapered shape in which the outer diameter gradually increases near the first end 21A of the insertion hole 21. The resin pipe 23 may also have a shape that is bent at multiple points along the length. For this reason, the shape of the region between the metal pipe 22 and the resin pipe 23 where the first filler 24 is filled tends to be complex.

[0065] Therefore, by using a material as the first filler 24 that is liquid when filled and becomes solid after filling, the first filler 24 can be easily filled regardless of the shape of the space between the metal pipe 22 and the resin pipe 23.

[0066] The material of the first filler 24 is not particularly limited, but is preferably a non-shrink grout agent, and for example, one or more types selected from cement mortar, epoxy resin mortar, water glass grout, etc. can be used.

[0067] It is preferable that the first filler 24 fills the entire gap between the metal pipe 22 and the resin pipe 23. When a rubber sheet 26 is disposed on the outer periphery of the resin pipe 23, it is preferable that the first filler 24 fills the entire gap excluding the rubber sheet 26.

[0068] 2, the metal tube 22 can be configured to be exposed from the insertion hole 21 at the second end 21B of the insertion hole 21. In this case, the first filler 24 may also be filled in at least a part of the portion 22C of the metal tube 22 exposed from the insertion hole 21.

[0069] Since the first filler 24 is filled in at least a part of the portion 22C exposed from the insertion hole 21 of the metal tube 22, vibration and displacement of the tendon 11 can be suppressed even when force is applied to the tendon 11 at the second end 21B of the insertion hole 21. Therefore, damage to the metal tube 22 and the like due to vibration of the tendon 11 in the vicinity of the second end 21B of the insertion hole 21 can be prevented. (Tension material) There are no particular limitations on the type of tendon 11, and any tendon capable of introducing tension to the concrete structure 12 such as the main girder may be used. Examples of tendon 11 include one or more types selected from PC steel strands, PC steel rods, carbon fiber composite cables, etc. Note that the "PC" in PC steel strands, etc., is an abbreviation for "prestressed concrete."

[0070] The number of tendons 11 in the cable structure 20 of the present embodiment is not particularly limited, and may be one or may be multiple as shown in Figs.

[0071] The tendon 11 may have an anticorrosive coating 41 on its surface, as shown in Fig. 4. Fig. 4 is a cross-sectional view of the tendon 11 in a plane perpendicular to the longitudinal direction of the PC steel strand when the tendon 11 is a PC steel strand.

[0072] The material of the anticorrosion coating 41 is not particularly limited, and may be, for example, one or more types selected from zinc plating, resin, etc. The anticorrosion coating 41 may be composed of multiple layers, such as zinc plating and a resin coating.

[0073] The resin may be, for example, a thermosetting resin, and is preferably one or more types selected from epoxy resin, polyethylene resin, and the like.

[0074] By providing the anticorrosive coating 41 on the surface of the tendon 11, the installed tendon 11 can be prevented from corroding and the like, and its durability can be increased.

[0075] The tendon 11 is gripped and fixed at a first end 21A of the insertion hole 21 by a fixing device 25. The end of the tendon 11 gripped by the fixing device 25 may be referred to as a first tendon end 11A.

[0076] The cable structure 20 of the present embodiment has a structure in which the tendons 11 are fixed, and therefore includes the first tendon end portion 11A of the tendons 11.

[0077] The cable structure of this embodiment may further include an optional member. (rubber sheet) The cable structure 20 of the present embodiment may further include a rubber sheet 26 disposed along the outer periphery of the resin tube 23 at the second end 21B located opposite to the first end 21A of the insertion hole 21.

[0078] As shown in FIG. 2, the metal tube 22 can be exposed from the second end 21B of the insertion hole 21, and the rubber sheet 26 can be said to be arranged along the outer periphery of the resin tube 23 at the second metal tube end 22B of the metal tube 22.

[0079] Since the tension member 11 is not gripped by the fixing device 25 at the second end 21B of the insertion hole 21, when an external force is applied, it is prone to vibration, displacement, etc. near the second end 21B of the insertion hole 21.

[0080] The cable structure 20 of this embodiment has a rubber sheet 26 arranged along the outer periphery of the resin tube 23 at the second end 21B of the insertion hole 21, so that even if force is applied to the tension member 11, it is possible to prevent the metal tube 22, the first filler 24, etc. from being damaged by the force applied thereto.

[0081] The shape of the rubber sheet 26 is not particularly limited, but may be, for example, a plate-shaped rubber sheet as shown in Figures 5A and 5B. Figure 5B is a side view of the rubber sheet 26 of Figure 5A as viewed along the block arrow D.

[0082] 5A and 5B has recesses 26A and protrusions 26B at its ends, and can be wrapped around the outer periphery of resin pipe 23 with the longer sides of rubber sheet 26 aligned. Then, recesses 26A and protrusions 26B fit together, allowing rubber sheet 26 to be evenly positioned around the outer periphery of resin pipe 23.

[0083] 5A and 5B, the shapes of the recessed portion 26A and the protruding portion 26B are not limited to those shown in Fig. 5A and 5B, and may be any shape, and it is also possible to provide a plurality of recessed portions 26A and protruding portions 26B. Also, it is also possible to provide a rectangular shape or the like without providing the recessed portion 26A and the protruding portion 26B.

[0084] The rubber sheet 26 may be wound spirally around the outer periphery of the resin pipe 23 and fixed thereto with an adhesive, tape or the like.

[0085] The material of the rubber sheet 26 is not particularly limited, but for example, a material having a rubber hardness of HDA 15 or more and HDA 70 or less can be used. The notation of rubber hardness is in accordance with JIS K 7215 (1986).

[0086] The material of the rubber sheet 26 may be one or more selected from the group consisting of chloroprene rubber, ethylene propylene diene rubber (EPDM rubber), and nitrile rubber (NBR).

[0087] The thickness T26 of the rubber sheet 26 is not particularly limited, but can be, for example, 5 mm or more and 40 mm or less. By making the thickness T26 of the rubber sheet 26 5 mm or more, even if a force is applied to the tendon 11 and the resin pipe 23 is displaced, the rubber sheet 26 can absorb the force applied from the resin pipe 23 to the first filler 24, and the first filler 24 and the like can be prevented from being damaged.

[0088] If the thickness T26 of the rubber sheet 26 is excessively large, there is a concern that the workability may decrease when installing the rubber sheet 26 along the outer periphery of the resin pipe 23. In contrast, by setting the thickness T26 of the rubber sheet 26 to 40 mm or less, the weight of the rubber sheet 26 can be suppressed and the workability can be improved.

[0089] The length L26 of the rubber sheet 26 along the longitudinal direction is not particularly limited, and can be selected according to the outer periphery of the resin pipe 23 so as to cover the resin pipe 23 along the outer periphery of the resin pipe 23. The length L26 of the rubber sheet 26 along the longitudinal direction can be, for example, 240 mm or more and 580 mm or less.

[0090] The width W26 of the rubber sheet 26 is not particularly limited, but can be selected so as to protect the metal tube 22, the resin tube 23, the first filler 24, etc. at the second end 21B of the insertion hole 21. For example, W26 can be 5 cm or more and 20 cm or less. (1st mold release material, 2nd mold release material) The cable structure 20 of the present embodiment may further include a first release material 61 disposed on the outer surface 231 of the resin tube 23, as shown in Fig. 6. Fig. 6 is a cross-sectional view taken along line CC in Fig. 2 when the cable structure 20 includes the first release material 61 and the second release material 62.

[0091] After installation, the tendon 11 may need to be replaced if it deteriorates over time or if it is damaged by an external force, etc. By disposing the first release material 61 on the outer surface 231 of the plastic pipe 23, the tendon 11 installed in the insertion hole 21 can be easily removed together with the plastic pipe 23, and replacement of the tendon 11, etc. can be easily performed.

[0092] The material of the first release material 61 is not particularly limited, but may be one or more selected from, for example, mineral oil, and synthetic resins such as polyethylene (PE) and polytetrafluoroethylene (PTFE).

[0093] When the first release material 61 is a mineral oil, the mineral oil can be applied to the outer surface 231 of the resin pipe 23. When the first release material 61 is a synthetic resin, it may be made into a sheet and wrapped around the outer surface 231 of the resin pipe 23, or it may be made into a tape and wound spirally around the outer surface 231 of the resin pipe 23.

[0094] When the first release material 61 is placed on the outer surface 231 of the resin pipe 23, it is preferable that the entire outer surface 231 of the resin pipe 23 is covered by the first release material 61, at least in the portion of the outer surface 231 of the resin pipe 23 where the first filler 24 is placed.

[0095] In addition, the cable structure 20 of the present embodiment may further include a second release material 62 disposed on the inner surface 222 of the metal tube 22 .

[0096] By arranging the second release material 62 on the inner surface 222 of the metal tube 22, it becomes possible to easily remove the first filler 24, the resin tube 23, and the tensioning material 11 from the metal tube 22, and replacement of the tensioning material 11, etc. can be easily performed.

[0097] The material of the second release material 62 is not particularly limited, but may be one or more selected from, for example, mineral oil, and synthetic resins such as polyethylene (PE) and polytetrafluoroethylene (PTFE).

[0098] When the second release material 62 is a mineral oil, the mineral oil can be applied to the inner surface 222 of the metal tube 22. When the second release material 62 is a synthetic resin, it may be formed into a sheet and placed on the inner surface 222 of the metal tube 22.

[0099] When the second release material 62 is placed on the inner surface 222 of the metal tube 22, it is preferable that the entire inner surface 222 of the metal tube 22 is covered by the second release material 62, at least in the portion of the inner surface 222 of the metal tube 22 where the first filler 24 is placed. (Second filler) The cable structure 20 of the present embodiment may further include a second filler 27 disposed between the tendon 11 and the resin tube 23 .

[0100] By further including the second filler 27 disposed between the tendon 11 and the plastic tube 23, it is possible to suppress vibration and displacement of the tendon 11 within the plastic tube 23 even when an external force is applied to the tendon 11. This makes it possible to prevent the tendon 11 from rubbing against each other and being damaged, and to prevent the plastic tube 23 from being damaged due to the displacement of the tendon 11.

[0101] The material of the second filler 27 is not particularly limited, and it is preferable that the second filler 27 is a material that has fluidity, i.e., a liquid material, when filled between the tendon 11 and the plastic pipe 23. By using a material that has fluidity when filled, the gap between the tendon 11 and the plastic pipe 23 can be easily filled regardless of its shape, and it is possible to prevent a gap from remaining between the tendon 11 and the plastic pipe 23. The second filler 27 is preferably a material that coagulates and becomes solid after being filled between the tendon 11 and the plastic pipe 23.

[0102] A plurality of tendons can be used as the tendons 11. The plastic pipe 23 can have a tapered shape in which the outer diameter gradually increases near the first end 21A of the insertion hole 21, as shown in Fig. 2, for example, or can have a shape that is bent at a plurality of points along the length. For this reason, the space between the tendons 11 and the plastic pipe 23 is likely to have a complex shape.

[0103] Therefore, by using a material as the second filler 27 that is liquid when filled and becomes solid after filling, the second filler 27 can be easily filled regardless of the shape of the space between the tendon 11 and the plastic pipe 23.

[0104] The material of the second filler 27 is not particularly limited, but is preferably a non-shrink grout agent, and for example, one or more types selected from cement mortar, epoxy resin mortar, water glass grout, etc. can be used.

[0105] It is preferable that the second filler 27 is filled in the entire gap between the tendon 11 and the plastic pipe 23 . (fixtures, anchor plates) The cable structure 20 of this embodiment may also have a fastener 25 that grips the first tendon end 11A of the tendon 11.

[0106] The configuration of the fixing device 25 is not particularly limited, and various fixing devices can be used depending on the type of the tension member 11, etc. For example, when the cable structure 20 of this embodiment has a plurality of tension members 11, a fixing device 25 capable of collectively holding the plurality of tension members 11 can be used as shown in Fig. 2, or a fixing device can be provided for each tension member 11.

[0107] The cable structure 20 of the present embodiment may also have an anchor plate 28 disposed between the fixing device 25 and the concrete structure 12 to support a load applied to the fixing device 25. In FIG. 2, an example is shown in which a first supply port 281 for supplying the first filler 24 between the metal pipe 22 and the resin pipe 23 and a first exhaust port 282 are provided on the anchor plate 28, but the present invention is not limited to this embodiment. For example, when supplying the first filler 24, a form (not shown) provided at the second metal pipe end 22B of the metal pipe 22, a first supply port for supplying the first filler 24 to the metal pipe 22, etc., and a first exhaust port for discharging gas between the metal pipe 22 and the resin pipe 23 may be provided. (Grout cap) In the cable structure 20 of this embodiment, the second filler 27 can also be arranged around the first tendon end 11A of the tendon 11 in order to protect the first tendon end 11A of the tendon 11. For this reason, the cable structure 20 of this embodiment can also have a grout cap 29 that has a function as a formwork for filling the second filler 27 and can protect the first tendon end 11A and the second filler 27.

[0108] The grout cap 29 may be provided with a second supply port 291 for supplying a second filler into the grout cap 29 or between the tendon 11 and the plastic pipe 23, and a second exhaust port 292 for discharging gas from inside the grout cap 29, etc. However, the installation positions of the second supply port 291 and the second exhaust port 292 are not particularly limited, and they may be installed at any position other than the grout cap 29, such as the outer surface of the plastic pipe 23. [Method of manufacturing cable structure] Next, a method for manufacturing the cable structure of the present embodiment will be described. According to the method for manufacturing the cable structure of the present embodiment, the cable structure according to one aspect of the present disclosure can be manufactured. Therefore, the description of the matters that have already been described will be omitted.

[0109] The method for producing the cable structure of the present embodiment can be carried out according to a flow 70 shown in FIG. 7A, and can include the following resin pipe installation step (S1) and first filler filling step (S2).

[0110] Each step will be described below. (1) Resin pipe installation process (S1) In the resin pipe installation process (S1), a resin pipe 23 can be installed in a metal pipe 22 arranged in an insertion hole 21 provided in a concrete structure 12 of a bridge 10.

[0111] 2, the insertion hole 21, the metal pipe 22, and the plastic pipe 23 may be bent at multiple locations along their length. Also, the plastic pipe 23 may have a tapered shape depending on the arrangement of the tendons 11. For this reason, it is preferable to divide the plastic pipe 23 into multiple members along its length, and in the plastic pipe installation step (S1), connect the divided members of the plastic pipe 23 one by one while inserting them into the insertion hole 21. There are no particular limitations on the method for connecting the divided members of the plastic pipe 23, and they may be connected using an adhesive, various connecting members, or the like. (2) First filler filling step (S2) In the first filler filling step (S2), the gap (gap) between the metal pipe 22 and the resin pipe 23 can be filled with the first filler .

[0112] In the first filler filling step (S2), for example, the first filler 24 can be supplied from a first supply port 281 which is a supply port connected to the gap between the metal pipe 22 and the resin pipe 23. At this time, gas in the gap between the metal pipe 22 and the resin pipe 23 can be exhausted from a first exhaust port 282 which is an exhaust port connected to the gap between the metal pipe 22 and the resin pipe 23 and which is provided separately from the first supply port 281 at a position higher than the first supply port 281.

[0113] By filling the first filler 24 while discharging gas between the metal pipe 22 and the resin pipe 23 from the first exhaust port 282, which is an exhaust port provided at a higher position than the first supply port 281, which is a supply port, the first filler 24 can be filled between the metal pipe 22 and the resin pipe 23 without any gaps.

[0114] According to the manufacturing method of the cable structure of this embodiment, a new cable structure can be manufactured in which the first filler 24 is disposed between the resin pipe 23 in which the tendon 11 is installed and the insertion hole 21. According to the manufacturing method of the cable structure of this embodiment, by carrying out the resin pipe installation step (S1) and the first filler filling step (S2), a structure can be made in which the first filler 24 is disposed between the metal pipe 22 and the resin pipe 23, as shown in Figs. 2 and 3. By disposing the first filler 24 between the metal pipe 22 and the resin pipe 23, the gap between the metal pipe 22 and the resin pipe 23 can be filled with the first filler 24. Therefore, even if a force is applied to the tendon 11, the tendon 11 and the resin pipe 23 are restricted from vibrating or displacing, and the insertion hole 21 and the bridge frame can be prevented from being damaged. Furthermore, even if an outward expanding force is applied to the plastic pipe 23 when the tendon 11 is installed in the plastic pipe 23 and tension is applied to the tendon 11, the first filler 24 arranged around the plastic pipe 23 can suppress the expansion of the plastic pipe 23. Therefore, damage to the plastic pipe 23 can be prevented.

[0115] The method for manufacturing a cable structure according to the present embodiment may include a tendon installation step (S3) and a tensioning step (S4) as shown in flow 700 in Fig. 7B. In addition, the method may further include a second filler filling step (S5). (3) Tensile installation process (S3) In the tendon installation step (S3), the tendon 11 can be installed in the plastic pipe 23. (4) Tension process (S4) In the tensioning step (S4), tension can be introduced to the tendons 11. The method of introducing tension to the tendons 11 is not particularly limited, and a jack can be connected to the tendons 11 and tension can be introduced to the tendons 11 by the jack.

[0116] In the tensioning process, it is preferable to introduce tension into the tendons 11 while measuring the tension introduced into the tendons 11 and the amount of displacement of the tendons 11 and creating a tension control chart.

[0117] The tendon installation step (S3) and the tensioning step (S4) may be performed before the first filler filling step (S2).

[0118] By carrying out the tendon installation step (S3) and the tensioning step (S4), a cable structure 20 can be obtained in which tendon 11 with tension introduced into resin pipe 23 is arranged. (5) Second filler filling step (S5) In the second filler filling step (S5), for example, after a grout cap 29 is installed so as to cover the first tendon end 11A of the tendon 11 (grout cap installation step), the second filler 27 can be supplied from the second supply port 291. At this time, the second filler 27 can be filled in the grout cap 29 and in the gap between the tendon 11 and the resin pipe 23.

[0119] In addition, while the second filler 27 is being supplied, it is preferable to exhaust gas in the grout cap 29 and in the gap between the tendon 11 and the resin pipe 23 from a second exhaust port 292 connected to the grout cap 29 and the gap between the tendon 11 and the resin pipe 23. It is preferable that the second exhaust port 292 is provided separately from the second supply port 291 at a position higher than that of the second supply port 291. By exhausting gas in the grout cap 29 and in the gap between the tendon 11 and the resin pipe 23 from the second exhaust port 292, the second filler 27 can be filled into the grout cap 29 and the like without leaving any gaps.

[0120] By carrying out the tension member installation process (S3), the tensioning process (S4), and the second filler filling process (S5), a configuration can be achieved in which the tension member 11 is placed in the plastic pipe 23 and the second filler 27 is placed between the plastic pipe 23 and the tension member 11.

[0121] By further including the second filler 27 disposed between the tendon 11 and the plastic tube 23, it is possible to suppress vibration and displacement of the tendon 11 within the plastic tube 23 even when an external force is applied to the tendon 11. This makes it possible to prevent the tendon 11 from rubbing against each other and being damaged, and to prevent the plastic tube 23 from being damaged due to the displacement of the tendon 11. (6) First mold release material placement process, second mold release material placement process The manufacturing method of the cable structure of this embodiment may further include a first release material placement process of placing a first release material 61 on the outer surface 231 of the resin tube 23, and a second release material placement process of placing a second release material 62 on the inner surface 222 of the metal tube 22.

[0122] In the first release material applying step and the second release material applying step, the release material can be applied or applied to the outer surface 231 of the resin pipe 23 or the inner surface 222 of the metal pipe 22 depending on the type of release material.

[0123] The timing of performing the first release material placing step and the second release material placing step is not particularly limited, but for example, the first release material placing step can be performed before or after the resin pipe installation step (S1). The second release material placing step can be performed before the resin pipe installation step (S1). [Explanation of symbols]

[0124] 10 Bridges 11 Tensor material 11A 1st tendon end 12 Concrete Structures 13 Deflection section 14 Upper floor plate 15 Lower floor version 16 Space 17 Pier Area A B area XX axis (bridge axis) YY axis ZZ axis 20 Cable structure 21 Insertion hole 21A 1st end 21B 2nd end 211 Inner surface 22 Metal tube D22 Inner diameter 221 External surface 222 Inner surface 22A 1st metal tube end 22B 2nd metal tube end 22C Part exposed from the insertion hole of the metal pipe 23 Plastic pipe D23 Outer diameter 231 External surface 24 First Filler 25 Fixture 26 Rubber Sheet 26A Recess 26B Convex T26 Thickness L26 Length W26 width D Block Arrow 27 Second Filler 28 Anchor Plate 281 1st supply port 282 First exhaust port 29 Grout Cap 291 2nd supply port 292 Second exhaust port 41 Anticorrosive coating 61 1st release material 62 Second release material 70 Flow 700 Flow S1 Resin pipe installation process S2 First filler filling process S3 Tensile installation process S4 Tension process S5 Second filler filling process

Claims

1. A metal pipe disposed in an insertion hole provided in a concrete structure of a bridge; A resin pipe disposed within the metal pipe; a first filler disposed between the metal pipe and the resin pipe; and a tension member disposed within the resin pipe.

2. The tendon is gripped by a fastener at a first end of the insertion hole, The cable structure according to claim 1 , further comprising a rubber sheet disposed along an outer periphery of the resin tube at a second end portion of the insertion hole located opposite to the first end portion.

3. The metal tube is exposed from the insertion hole at the second end of the insertion hole, The cable structure according to claim 2 , wherein the first filler is also disposed in at least a part of the portion of the metal tube exposed from the insertion hole.

4. The cable structure according to claim 1 , further comprising a first release material disposed on an outer surface of the resin pipe.

5. The cable structure according to claim 1 , further comprising a second release material disposed on an inner surface of the metal tube.

6. The cable structure according to claim 1 , further comprising a second filler disposed between the tendon and the resin tube.

7. The cable structure according to claim 1 , wherein the tendons have an anticorrosive coating on a surface thereof.

8. a resin pipe installation process for installing a resin pipe into a metal pipe disposed in an insertion hole provided in a concrete structure of a bridge; and a first filler filling step of filling a gap between the metal pipe and the resin pipe with a first filler.

9. In the first filler filling step, the first filler is supplied from a supply port connected to the gap between the metal pipe and the resin pipe, 9. The method for manufacturing a cable structure according to claim 8, further comprising the step of discharging gas from the gap between the metal pipe and the resin pipe through an exhaust port provided separately from the supply port at a position higher than the supply port.

10. a tendon installation step of installing a tendon in the resin pipe; The method for producing a cable structure according to claim 8 or 9, further comprising a tensioning step of applying tension to the tendons.

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