Device for measuring the condition of reinforcing materials, method for measuring the condition of reinforcing materials, method for manufacturing a device for measuring the condition of reinforcing materials

Abstract

The objective is to provide a device for measuring the condition of multiple reinforcing materials installed on a slope, which can be easily used to measure their condition. [Solution] The system has optical fibers with protective members arranged along the surface of the slope, Multiple reinforcing members are driven into the slope so as to intersect with the slope, and the optical fiber with protective member is arranged so as to pass through the area where the multiple reinforcing members are located. The optical fiber with the protective member comprises a linear protective member and a first optical fiber. A reinforcing material condition measuring device wherein at least a portion of the first optical fiber is arranged along the longitudinal side of the protective member and a portion of its surface is covered by the protective member.

Description

[Technical Field]

[0001] The present disclosure relates to a reinforcing material condition measuring apparatus, a reinforcing material condition measuring method, and a method for manufacturing a reinforcing material condition measuring apparatus. [Background Art]

[0002] Patent Literature 1 discloses an apparatus used for measuring a tensile force acting on a tendon anchored to a bearing member via an anchoring member at an end of a concrete member, the tensile force measuring apparatus comprising: a hydraulic spacing means for spacing the anchoring member apart from the bearing member; a hydraulic pressure supply means for supplying hydraulic pressure to the hydraulic spacing means; an oil amount detecting means for measuring a change in the amount of oil supplied from the hydraulic pressure supply means to the hydraulic spacing means; and a pressure measuring means for measuring the hydraulic pressure acting on the hydraulic spacing means. [Prior Art Document] [Patent Document]

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2002-257654 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] Conventionally, a plurality of reinforcing materials are arranged so as to intersect with a slope.

[0005] A tensile force is introduced into the reinforcing material, and a compressive force is applied to the natural ground including the slope, thereby maintaining the shape of the slope and preventing the occurrence of landslides and the like. However, after the reinforcing material is installed, the tensile force introduced into the reinforcing material may decrease. From the viewpoint of enhancing the shape stability of the slope and continuously preventing the occurrence of landslides and the like, measuring the tensile force introduced into the reinforcing material has been conventionally performed as disclosed, for example, in Patent Document 1.

[0006] However, conventional tension measuring devices often require a lot of work to perform measurements, and measuring tension and other parameters for multiple reinforcing materials is time-consuming and difficult.

[0007] Therefore, the purpose of this disclosure is to provide a reinforcing material condition measuring device that can easily measure the condition of multiple reinforcing materials installed on a slope. [Means for solving the problem]

[0008] The reinforcing material condition measuring device of the present disclosure has an optical fiber with a protective member arranged along the surface of a slope, wherein a plurality of reinforcing materials are driven into the slope so as to intersect with the slope, the optical fiber with the protective member is arranged so as to pass through the area in which the plurality of reinforcing materials are arranged, the optical fiber with the protective member has a linear protective member and a first optical fiber, at least a portion of the first optical fiber is arranged along the longitudinal side of the protective member and a portion of its surface is covered by the protective member. [Effects of the Invention]

[0009] According to this disclosure, a device for measuring the condition of multiple reinforcing materials installed on a slope can be provided that allows for easy measurement of the condition of those materials. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a perspective view of a reinforcing material condition measuring device according to one embodiment of the present disclosure, installed on a slope. [Figure 2] Figure 2 is a schematic cross-sectional view along line BB in Figure 1. [Figure 3A] Figure 3A is a schematic cross-sectional view of an optical fiber with a protective component, viewed from a plane perpendicular to the longitudinal side. [Figure 3B] Figure 3B is a schematic cross-sectional view of an optical fiber with a protective component, viewed from a plane perpendicular to the longitudinal side. [Figure 3C] Figure 3C is a schematic cross-sectional view of an optical fiber with a protective component, viewed from a plane perpendicular to the longitudinal side. [Figure 4] Figure 4 is an explanatory diagram of the fixing member. [Modes for carrying out the invention]

[0011] The implementation methods are described below.

[0012] [Description of Embodiments in this Disclosure] The embodiments of this disclosure are first listed and described. In the following description, the same or corresponding elements are denoted by the same reference numerals, and the same description of them is not repeated.

[0013] (1) A reinforcing material condition measuring device according to one aspect of the present disclosure has an optical fiber with a protective member arranged along the surface of a slope, wherein a plurality of reinforcing materials are driven into the slope so as to intersect with the slope, the optical fiber with the protective member is arranged so as to pass through the area in which the plurality of reinforcing materials are arranged, the optical fiber with the protective member has a linear protective member and a first optical fiber, at least a portion of the first optical fiber is arranged along the longitudinal side of the protective member and a portion of its surface is covered by the protective member.

[0014] In one aspect of this disclosure, a reinforcement material condition measuring device is configured such that a protective optical fiber, positioned along the surface of a slope, passes through an area where multiple reinforcements are located. By emitting scattered light from a first optical fiber within the protective optical fiber, the strain distribution along the longitudinal direction of the first optical fiber can be measured. Since the measured strain distribution reflects the axial force and tension forces of the multiple reinforcements, the axial force and tension forces of the reinforcements can be easily measured solely by emitting scattered light to the first optical fiber.

[0015] In an optical fiber with a protective component, a portion of the surface of the first optical fiber is covered by the protective component, thereby protecting the first optical fiber and preventing damage.

[0016] (2) In (1) above, the protective member may be a metal wire.

[0017] By using a metal wire as the protective member, the toughness of the protective member formed of the metal wire can be improved, and breakage of the protective member and the first optical fiber disposed on the protective member can be particularly prevented.

[0018] (3) In (2) above, the metal wire includes a stranded wire obtained by stranding metal element wires, and the first optical fiber may be disposed in a twist groove of the stranded wire.

[0019] Since the metal wire includes the stranded wire, the metal wire can be easily bent. Therefore, the optical fiber with the protective member can be easily deformed in accordance with the arrangement of the plurality of reinforcing members, and the optical fiber with the protective member can be easily arranged in a region where the plurality of reinforcing members are arranged.

[0020] Further, by disposing the first optical fiber in the twist groove of the stranded wire obtained by stranding the metal element wires, the first optical fiber can be protected and breakage thereof can be prevented.

[0021] (4) In any one of (1) to (3) above, the present invention may include a plurality of said optical fibers with protective members.

[0022] By including a plurality of optical fibers with protective members, it becomes possible to measure one or more types selected from axial force and tensile force for a large number of reinforcing members.

[0023] (5) In any one of (1) to (4) above, pressure receiving plates are respectively disposed at ends of said plurality of reinforcing members, and said optical fiber with protective member may be disposed so as to pass through a region sandwiched between said pressure receiving plate and said slope for said plurality of reinforcing members.

[0024] By arranging the optical fiber with protective components to pass through the area sandwiched between the pressure plate and the slope, the first optical fiber of the optical fiber with protective components can strongly receive the axial force and tension applied to the reinforcing material via the pressure plate, enabling particularly accurate measurements.

[0025] (6) In any of (1) to (5) above, at least a portion of the plurality of reinforcing members may be fiber-optic reinforcing members having a second optical fiber arranged along the longitudinal side of the reinforcing member.

[0026] A reinforcing material condition measuring device according to one aspect of this disclosure has a second optical fiber arranged along the longitudinal direction of the reinforcing material, which allows for more precise measurement of the axial force of the reinforcing material.

[0027] By combining the first and second optical fibers to measure axial force and tension caused by reinforcing materials, the labor required for measurement can be reduced while more accurately measuring and detecting the condition of the reinforcing materials and abnormalities in the slope.

[0028] (7) In any of (1) to (6) above, the measurement unit may further include a scattered light measuring device connected to the first optical fiber.

[0029] A reinforcing material condition measuring device according to one aspect of this disclosure has a measuring unit that includes a scattered light measuring device connected to a first optical fiber, thereby enabling easy measurement of strain and other properties along the longitudinal direction of the first optical fiber.

[0030] (8) The above (7) may have a positioning unit that identifies the position of the reinforcing material on the first optical fiber from the strain distribution along the longitudinal direction of the first optical fiber measured by the measuring unit.

[0031] The strain distribution measured by the first optical fiber of the optical fiber with protective material shows increased strain in the areas where reinforcing materials are placed, allowing the location of the reinforcing materials to be identified from the strain distribution. The positioning unit identifies the location of the reinforcing materials based on the strain distribution along the longitudinal direction of the first optical fiber, thereby accurately determining the axial force and tension of each reinforcing material.

[0032] (9) In (7) or (8) above, the measurement unit may have a calculation unit that performs measurements multiple times at predetermined timings and calculates one or more types of changes over time selected from the axial force and tension force due to the multiple reinforcing members from the change in the strain distribution along the longitudinal direction of the first optical fiber measured by the measurement unit.

[0033] The measurement unit performs multiple measurements, and the calculation unit calculates one or more types of changes over time selected from the axial force and tension force applied to multiple reinforcing members based on the changes in strain distribution, thereby allowing us to observe changes in axial force, etc., due to the reinforcing members.

[0034] (10) The system may further include an alarm unit that issues an alarm when the range of change over time of one or more types selected from the axial force and tension force due to the plurality of reinforcing members calculated by the calculation unit exceeds a specified value.

[0035] The reinforcing material condition measuring device according to one aspect of this disclosure has an alarm unit, which makes it possible to quickly notify the operator or manager if a problem occurs in the axial force or tension state of the reinforcing material.

[0036] (11) A method for measuring the condition of a reinforcing material according to one aspect of the present disclosure comprises a first measurement step of emitting scattered light from a measuring unit including a scattered light measuring device to a first optical fiber having a protective member that is arranged along the surface of a slope in which a plurality of reinforcing materials are driven and that passes through the region in which the plurality of reinforcing materials are arranged, and measuring one or more types selected from axial force and tension force applied to the plurality of reinforcing materials, wherein the protective member has a linear protective member and the first optical fiber, and at least a portion of the first optical fiber is arranged along the longitudinal side of the protective member and a portion of its surface is covered by the protective member.

[0037] In a method for measuring the condition of reinforcing materials according to one aspect of this disclosure, scattered light can be emitted into a first optical fiber of an optical fiber with a protective member, which is positioned along the surface of a slope and passing through an area in which multiple reinforcing materials are arranged. By emitting scattered light into the first optical fiber of the optical fiber with a protective member, the strain distribution can be measured along the longitudinal direction of the first optical fiber. Since the measured strain distribution reflects the axial force and tension of the multiple reinforcing materials, the axial force and tension of the reinforcing materials can be easily measured by emitting scattered light into the first optical fiber alone.

[0038] In an optical fiber with a protective component, a portion of the surface of the first optical fiber is covered by the protective component, thereby protecting the first optical fiber and preventing damage.

[0039] (12) In (11) above, at least a portion of the plurality of reinforcing members is a fiber-optic reinforcing member having a second optical fiber arranged along the longitudinal side of the reinforcing member, and if the measurement value measured in the first measurement step is outside a predetermined range, the second measurement step may further include measuring one or more selected from the axial force and tension force along the longitudinal side of the fiber-optic reinforcing member using the second optical fiber of the fiber-optic reinforcing member.

[0040] In the second measurement process, the axial force and other parameters of the reinforcing material can be evaluated particularly accurately by measuring them along the longitudinal direction of the reinforcing material.

[0041] (13) In (11) above, at least a portion of the plurality of reinforcing members is a fiber-optic reinforcing member having a second optical fiber arranged along the longitudinal direction of the reinforcing member, and further comprises a second measurement step of measuring one or more selected from axial force and tension force along the longitudinal direction of the fiber-optic reinforcing member using the second optical fiber of the fiber-optic reinforcing member, and if the measured value measured in the second measurement step is outside a predetermined range, the first measurement step may be performed.

[0042] By combining the first and second measurement processes, and performing the first measurement process only when an abnormality is detected in the measurement values ​​from the second process, the labor required for measurement can be reduced while more accurately measuring and detecting the condition of reinforcing materials, slope abnormalities, etc.

[0043] (14) A method for manufacturing a reinforcing material condition measuring device according to one aspect of the present disclosure includes a step of arranging an optical fiber with a protective member so as to be along the surface of a slope in which a plurality of reinforcing materials are driven and so as to pass through the region in which the plurality of reinforcing materials are arranged, wherein the optical fiber with a protective member comprises a linear protective member and a first optical fiber, and at least a portion of the first optical fiber is arranged along the longitudinal side of the protective member and a portion of its surface is covered by the protective member.

[0044] A method for manufacturing a reinforcement material condition measuring device according to one aspect of this disclosure allows for the installation of an optical fiber with a protective member along the surface of a slope in which multiple reinforcements are driven and passing through the area in which the multiple reinforcements are arranged. With the reinforcement material condition measuring device manufactured in this way, the strain distribution along the longitudinal direction of the first optical fiber can be measured by emitting scattered light in the first optical fiber of the optical fiber with the protective member. Since the measured strain distribution reflects the axial force and tension force due to the multiple reinforcements, the axial force and tension force due to the reinforcements can be easily measured by emitting scattered light into the first optical fiber alone.

[0045] In an optical fiber with a protective component, a portion of the surface of the first optical fiber is covered by the protective component, thereby protecting the first optical fiber and preventing damage.

[0046] (15) The above (14) may include a spraying step in which mortar or concrete is sprayed to cover the optical fiber with the protective member.

[0047] By implementing a spraying process, a concrete structure can be manufactured that covers the optical fiber with protective components. This protects the first optical fiber and the slope, and improves the shape stability of the slope.

[0048] [Details of the embodiments of this disclosure] Specific examples of a reinforcing material condition measuring device, a reinforcing material condition measuring method, and a method for manufacturing a reinforcing material condition measuring device according to one embodiment of this disclosure (hereinafter referred to as "this embodiment") will be described below with reference to the drawings. However, the present invention is not limited to these examples and is intended to be shown in the claims, with all modifications within the meaning and scope of equivalence to the claims included.

[0049] In this specification, the names of components may be described with prefixes such as "first," "second," etc. For example, they may be described as "optical fiber with first protective component" or "optical fiber with second protective component." The prefixes "first" and "second" added to "optical fiber with protective component" are merely used to identify each component and prevent confusion during description, and do not indicate arrangement or priority. When there is no risk of confusion or when referring to them collectively, they may be described as "optical fiber with protective component."

[0050] [1] Reinforcement material condition measuring device An example of the configuration of the reinforcing material condition measuring device (hereinafter also referred to as the "measuring device") of this embodiment will be explained with reference to Figures 1, 2, 3A, 3B, 3C, and 4.

[0051] Figure 1 is a perspective view of the reinforcing material condition measuring device of this embodiment installed on a slope.

[0052] Figure 2 is a schematic cross-sectional view along line BB in Figure 1.

[0053] Figures 3A, 3B, and 3C are schematic cross-sectional views of an optical fiber with a protective component, viewed in a plane perpendicular to the longitudinal side.

[0054] Figure 4 is an explanatory diagram of the fixing member.

[0055] As shown in Figures 1 and 2, the measuring device 10 of this embodiment may have optical fibers 11 with protective members arranged along the surface of the slope 100.

[0056] Multiple reinforcing members 20 are driven into the slope 100 so as to intersect with the slope 100, and the optical fiber 11 with a protective member can be positioned to pass through the area where the multiple reinforcing members 20 are located.

[0057] The optical fiber 11 with a protective member may include, for example, a protective member 31 and a first optical fiber 32, as shown in Figure 3A. The first optical fiber 32 can measure one or more forces selected from the axial force and tension force due to the reinforcing member 20.

[0058] In this embodiment, the measuring device 10 has an optical fiber with a protective member positioned along the surface of the slope, and is arranged so as to pass through an area where multiple reinforcing members are placed. By emitting scattered light from the first optical fiber of the optical fiber with the protective member, the strain distribution can be measured along the longitudinal direction of the first optical fiber. Since the measured strain distribution reflects the axial force and tension forces of the multiple reinforcing members, the axial force and tension forces of the reinforcing members can be easily measured simply by emitting scattered light to the first optical fiber.

[0059] In this specification, "slope" means a slope, and includes, for example, artificial slopes created by cutting or filling. (1) Optical fiber with protective component (1-1) Arrangement of optical fibers with protective members on slopes The arrangement of the optical fiber 11 with protective members on the slope 100 is not particularly limited, but for example, as shown in Figure 1, the optical fiber 11 with protective members can be arranged along the surface of the slope 100 and pass through the area where multiple reinforcing members 20 are arranged.

[0060] The optical fiber 11 with protective members can be placed between the concrete structure 22 and the slope 100, and may be positioned to pass through the natural ground (the outermost layer of soil) which is the surface of the slope 100.

[0061] The measuring device 10 of this embodiment can measure the axial force and tension force due to the reinforcing material 20. For this reason, the optical fiber 11 with protective member may be arranged to pass through a region where the influence of the axial force and tension force due to the reinforcing material is significant.

[0062] Figure 2 shows a cross-sectional view along line BB in Figure 1, which is a cross-section passing through the reinforcing member 20. As shown in Figure 2, pressure-receiving plates 21 are installed at each end 20A of the multiple reinforcing members 20. Therefore, the concrete structure 22 and the pressure-receiving plates 21 are arranged on the surface of the slope 100.

[0063] The pressure plate 21 has anchoring devices inside for fixing the end 20A of the reinforcing material 20 (not shown), and it receives the axial force and tension force of the reinforcing material 20, applying pressure to compress the concrete structure 22 and the slope 100.

[0064] Therefore, the optical fiber 11 with the protective member may be positioned to pass through the region being subjected to pressure by the pressure receiving plate 21. Specifically, the optical fiber 11 with the protective member may be positioned within region A1. Region A1 is the region sandwiched between the straight line L211A, which has an angle θ of 45 degrees with respect to the perpendicular line L212A passing through the end 21A of the pressure receiving plate 21, and the straight line L211B, in a cross-section passing through the central axis of the reinforcing member 20 as shown in Figure 2.

[0065] Furthermore, the optical fiber 11 with protective member may be placed within region A2. Region A2 is the area between the perpendicular line L212A and the perpendicular line L212B passing through the end 21A of the pressure receiving plate 21 in a cross-section passing through the central axis of the reinforcing member 20 as shown in Figure 2. In other words, the optical fiber 11 with protective member may be placed for multiple reinforcing members 20 so as to pass through the area between the pressure receiving plate 21 and the slope 100.

[0066] By arranging the optical fiber 11 with protective member to pass through the area sandwiched between the pressure receiving plate 21 and the slope 100, the first optical fiber 32 of the optical fiber 11 with protective member can strongly receive the axial force and tension applied to the reinforcing material 20 via the pressure receiving plate 21. For this reason, the measuring device of this embodiment can measure the axial force and tension applied to the reinforcing material 20 with particular accuracy.

[0067] The optical fiber 11 with protective member may also have a folded portion 111 within the slope 100.

[0068] Since the optical fiber with protective members has multiple folded sections 111, a single optical fiber with protective members 11 can be arranged to pass through an area where many reinforcing members 20 are installed. This makes it possible to increase the number of reinforcing members 20 that can measure axial force and tension force.

[0069] The measuring device 10 of this embodiment may also have multiple optical fibers with protective members, such as the first optical fiber with protective member 11A and the second optical fiber with protective member 11B shown in Figure 1.

[0070] The measuring device 10 of this embodiment has multiple optical fibers 11 with protective members, making it possible to measure one or more types of forces selected from axial force and tension force for a large number of reinforcing members 20. (1-2) Regarding protective components Figures 3A, 3B, and 3C show cross-sectional views of the optical fiber 11 with protective members in a plane perpendicular to its longitudinal side.

[0071] For example, as shown in Figure 3A, the optical fiber 11 with a protective member may have a linear protective member 31 and a first optical fiber 32. In the optical fiber 11 with a protective member, at least a portion of the first optical fiber 32 may be arranged along the longitudinal side of the protective member 31, and a portion of its surface may be covered by the protective member 31.

[0072] In the optical fiber 11 with a protective member, a portion of the surface of the first optical fiber 32 is covered by the protective member 31, thereby protecting the first optical fiber 32 and preventing damage.

[0073] Therefore, the protective member 31 may have a groove or cavity that serves as an optical fiber housing portion 33 for arranging the first optical fiber 32.

[0074] As shown in Figure 3A, the protective member 31 may have a groove along its longitudinal side that serves as an optical fiber housing portion 33, and the first optical fiber 32 may be housed in the groove.

[0075] Furthermore, as shown in Figure 3B, the protective member 31 may have a columnar cavity along its longitudinal side as an optical fiber housing section 33. In the case of Figure 3B, since the first optical fiber 32 is placed in the cavity which is the optical fiber housing section 33 of the protective member 31, the first optical fiber 32 will be completely covered by the protective member 31.

[0076] As shown in Figure 3C, the protective member 31 includes a stranded wire 34 made by twisting together individual wires 341, and the first optical fiber 32 may be placed in the twist groove 35 of the stranded wire 34.

[0077] Because the protective member 31 includes stranded wire 34, the protective member 31 can be easily bent. Therefore, the optical fiber 11 with the protective member can be easily deformed to match the arrangement of the multiple reinforcing members 20, and the optical fiber 11 with the protective member can be easily placed in the area where the multiple reinforcing members 20 are arranged.

[0078] If the protective member 31 includes a stranded wire 34, the material of the individual wires 341 is not particularly limited and may be made of resin or metal. However, from the viewpoint of increasing the toughness of the protective member 31, the individual wires 341 may be made of metal. For this reason, the protective member 31 may include a stranded wire 34 made by twisting together metal individual wires 341, and the first optical fiber 32 may be placed in the twist groove 35 of the stranded wire 34.

[0079] Even when the strands 341 are made of metal, i.e., when the protective member 31 is a metal wire, the protective member 31 includes stranded wires 34, which allows the protective member 31 to be easily bent. Therefore, the optical fiber 11 with the protective member can be easily deformed to match the arrangement of the multiple reinforcing members 20, and the optical fiber 11 with the protective member can be easily placed in the area where the multiple reinforcing members 20 are arranged.

[0080] Furthermore, by placing the first optical fiber 32 in the twist groove 35 of the stranded wire 34, which is made up of twisted strands 341, the first optical fiber can be protected and prevented from being damaged. By placing the first optical fiber 32 in the twist groove 35 of the stranded wire 34, which is made up of twisted metal strands 341, the first optical fiber can be particularly protected and prevented from being damaged.

[0081] As shown in Figure 3C, the first optical fiber 32 may be arranged so that it is entirely contained within a region enclosed by a tangent L30 of two adjacent strands 341 along the outer circumference of the stranded fiber 34, and two adjacent strands 341 along the outer circumference of the stranded fiber 34. The tangent L30 is a tangent that is in contact with the outer circumference of the stranded fiber 34. The two strands 341 that form the above region are the two strands 341 that are in contact with the tangent L30.

[0082] By positioning the first optical fiber 32 within the region enclosed by the tangent L30 and two adjacent strands 341 along the outer circumference of the stranded wire 34, the first optical fiber 32 is protected by the two strands 341, making it difficult for other components to directly contact the first optical fiber 32. As a result, it becomes difficult for external forces to be directly applied to the first optical fiber 32, and damage to the first optical fiber 32 can be particularly prevented.

[0083] As shown in Figures 3A and 3C, by exposing a portion of the first optical fiber 32 while a portion of the first optical fiber 32 is covered by the protective member 31, the first optical fiber 32 can be easily taken out at any point on the protective member 31 and connected to the scattered light measuring device. Furthermore, even if the first optical fiber 32 is cut or otherwise damaged, reconnection work can be easily performed.

[0084] The number of strands 341 in the stranded wire 34 and its structure are not particularly limited. For example, the number of strands 341 in the stranded wire 34 may be 7 or 19. When the number of strands 341 in the stranded wire 34 is 7, the structure of the stranded wire 34 can be a single-layer stranded structure in which 6 outer strands 341B are spirally twisted around a single central strand 341A, as shown in Figure 3C. In this case, the outer strands 341B are located on the outermost edge of the stranded wire 34. Figure 3C shows an example in which the central strand 341A and the outer strands 341B have the same strand diameter, but the invention is not limited to this form. For example, the strand diameter of the central strand 341A and the strand diameter of the outer strands 341B may be different.

[0085] The material of the protective member 31 is not particularly limited, but it may be made of metal in order to protect the first optical fiber 32. That is, the protective member 31 may be made of metal, or for example, a metal wire. By making the protective member 31 of metal, for example a metal wire, the toughness of the protective member 31, which is a metal wire, can be increased, and damage to the protective member 31 and the first optical fiber 32 placed on the protective member 31 can be particularly prevented.

[0086] The type of metal used for the metal wire 31 is not particularly limited, but for example, one or more types selected from aluminum, aluminum alloys, steel, etc. can be used.

[0087] The first optical fiber 32 can also be fixed to the protective member 31 with resin or the like. In this case, an ultraviolet-curing resin may be used as the resin.

[0088] To protect the protective member 31 and the first optical fiber 32, at least a portion of the surface of the protective member 31 and the first optical fiber 32 can be covered with a corrosion-resistant coating.

[0089] The material for the corrosion-resistant coating is not particularly limited, but for example, a resin with excellent corrosion resistance can be used. Examples of resins used for the corrosion-resistant coating include one or more selected from epoxy resins, polyethylene resins, etc. The corrosion-resistant coating may have multiple layers, and the material of each layer may be different or the same. (1-3) Regarding the first optical fiber As the first optical fiber 32, for example, one formed of a core and a cladding may be used. Examples of materials for the core and cladding include plastic and quartz glass. As the first optical fiber, one or more types selected from optical fiber strands having a primary coating on the outer circumference of the cladding, optical fiber cores having a secondary coating, and optical fiber cords having a reinforcing material on the outer circumference of the secondary coating and an outer sheath covering the outer circumference of the reinforcing material may be used.

[0090] Examples of primary coating materials include UV-curing resins. Examples of secondary coating materials include flame-retardant polyester elastomers. Examples of reinforcing materials include glass fibers, carbon fibers, and aramid fibers. Examples of outer covering materials include flame-retardant polyolefins such as flame-retardant polyethylene, flame-retardant crosslinked polyolefins such as flame-retardant crosslinked polyethylene, and heat-resistant vinyl.

[0091] The type of optical fiber used as the first optical fiber is not particularly limited and can be selected according to the type of measurement parameter to be measured (such as strain), the measurement method, and the type of scattered light used during measurement. For example, one or more types of optical fibers selected from single-mode optical fibers, multimode optical fibers, and polarization-maintaining optical fibers may be used as the first optical fiber.

[0092] The outer diameter of the first optical fiber 32 is not particularly limited, but for example, it may be 1.5 mm or less, or 1.0 mm or less.

[0093] By making the outer diameter of the first optical fiber 32 1.5 mm or less, the installation of the first optical fiber 32 can be easily facilitated. Alternatively, the first optical fiber 32 may be placed in the optical fiber housing section 33 of the protective member 31, but this prevents the size of the optical fiber housing section 33 from becoming excessively large.

[0094] The lower limit of the outer diameter of the first optical fiber 32 is not particularly limited, but the outer diameter of the first optical fiber 32 may be 0.235 mm or more, or 0.8 mm or more. The durability of the first optical fiber 32 can be increased by making the outer diameter of the first optical fiber 32 0.235 mm or more. When the first optical fiber 32 is installed and fixed on a measurement surface such as a slope, heat and external forces may be applied to the first optical fiber. However, by making the outer diameter of the first optical fiber 32 0.235 mm or more, it is possible to prevent the first optical fiber 32 from being damaged when it is installed or otherwise installed.

[0095] The number of first optical fibers 32 in the optical fiber 11 with protective member is not particularly limited; for example, as shown in Figures 3A and 3B, the optical fiber 11 with protective member may have only one first optical fiber 32.

[0096] However, since the first optical fiber 32 may break when installing the optical fiber 11 with protective material or after installation, the optical fiber 11 with protective material may have multiple optical fibers.

[0097] Specifically, as shown in Figure 3C, for example, the optical fiber 11 with a protective member may have two or more first optical fibers 32.

[0098] In the optical fiber 11 with protective member shown in Figure 3C, the first optical fiber 321 and the second optical fiber 322 are arranged in the twist grooves 35 of the stranded wire 34, which is the protective member 31. The arrangement of the first optical fiber 321 and the second optical fiber 322 in the stranded wire 34 is not particularly limited; they may be arranged in the same twist groove 35 or in different twist grooves 35. For example, as shown in Figure 3C, the first optical fiber 321 and the second optical fiber 322 may be arranged in twist grooves 35 at opposing positions in a cross section perpendicular to the longitudinal side of the stranded wire 34. (2) Fixing member The measuring device 10 of this embodiment may have a fixing member that fixes at least a portion of the optical fiber 11 with a protective member to the slope 100.

[0099] Since at least a portion of the optical fiber 11 with protective material is fixed by a fixing member, it is possible to prevent the optical fiber 11 with protective material from being displaced after installation. Therefore, the positional accuracy when measuring strain, etc., after the optical fiber 11 with protective material is installed can be improved.

[0100] Figure 4 shows an example configuration when the slope 100 is viewed from above in the vertical direction, i.e., along block arrow A in Figure 1, and the measuring device 10 has a fixing member 41. In Figure 4, the concrete structure 22 is omitted from the description.

[0101] The fixing member 41 can be placed, for example, on the surface of the slope 100. The fixing member 41 can also have a grid shape in at least a portion of it, as shown in Figure 4.

[0102] Note that the grid shape is not limited to the rectangular grid shape shown in Figure 4, but may also be a rhombus, polygon, or other shape.

[0103] If the fixing member 41 has a grid shape, the number of points of contact between the fixing member 41 and the optical fiber 11 with protective member can be increased, making it easier to fix the optical fiber 11 with protective member to the fixing member 41.

[0104] Mortar or cement can be sprayed onto the slope 100 and the optical fiber 11 with protective members, and then covered with a concrete structure 22. If the fixing member 41 has a grid shape, the fixing member 41 can also support the concrete structure 22.

[0105] The material of the fixing member 41 is not particularly limited, but for example, metal may be used. Examples of metals include steel, stainless steel, aluminum, and aluminum alloys. (3) Scattered light measuring device The measuring device 10 of this embodiment may further include a measuring unit 12 which includes a scattered light measuring device connected to the first optical fiber 32.

[0106] The measuring device 10 has a measuring section 12 that includes a scattered light measuring device connected to the first optical fiber 32, allowing for easy measurement of strain and other parameters along the longitudinal direction of the first optical fiber 32. Furthermore, one or more types of axial force and tension forces from multiple reinforcing members 20 can be determined from the strain distribution along the longitudinal direction of the first optical fiber 32. The scattered light measuring device does not need to be constantly connected to the first optical fiber 32; it may be detachable and connected only during measurement.

[0107] If the measuring device 10 has multiple first optical fibers 32, the scattered light measuring device may have a switching device that switches the optical fiber emitting and irradiating scattered light so that the first optical fiber 32 to be measured can be switched.

[0108] The measuring unit 12 may perform measurements multiple times at predetermined intervals. The predetermined intervals are not particularly limited, but for example, measurements may be performed at predetermined fixed intervals, or measurements may be performed at specific times such as in the morning and at night within a specific period such as a day, a month, or a year.

[0109] The method for measuring strain and other parameters using a scattered light measuring device will be explained in the section on measurement methods. (4) Calculation section The measuring device 10 of this embodiment may further include a calculation unit 13.

[0110] If the measurement unit 12 performs measurements multiple times, the calculation unit 13 may calculate one or more types of time-dependent changes selected from the axial force and tension force due to the multiple reinforcing members 20, based on the changes in the strain distribution along the longitudinal direction of the first optical fiber 32 measured by the measurement unit 12.

[0111] The measurement unit 12 performs measurements multiple times at predetermined intervals, and the calculation unit 13 calculates one or more types of changes over time selected from the axial force and tension force applied to the multiple reinforcing members 20 based on the change in strain distribution, thereby allowing the changes in axial force, etc., due to the reinforcing members to be observed.

[0112] The calculation unit 13 may include a CPU, which is an arithmetic processing unit for performing necessary calculations, RAM or ROM, which are main memory devices, auxiliary storage devices, input / output interfaces, and display devices, which are output devices. The CPU, main memory, auxiliary storage devices, input / output interfaces, and output devices of the calculation unit 13 can be interconnected by a bus. All of the above components of the calculation unit 13 do not need to be housed in the same enclosure; for example, the auxiliary storage device and display device may be provided externally. The auxiliary storage device is a storage device such as an SSD or HDD.

[0113] CPU stands for Central Processing Unit, RAM stands for Random Access Memory, and ROM stands for Read Only Memory. SSD stands for Solid State Drive, and HDD stands for Hard Disk Drive.

[0114] Input / output interfaces include wired or wireless interfaces for exchanging measurement data. Examples of input / output interfaces include interfaces for exchanging measurement data with the scattered light measuring device of the measurement unit 12, and interfaces for controlling the alarm unit 14. Furthermore, for example, when receiving measurement values ​​calculated at a remote location, the input / output interface may have a communication port for transmitting the measurement values ​​to the remote location via a network.

[0115] Furthermore, input / output interfaces may include user interfaces such as a touch panel, keyboard, and operation buttons for selecting data to be calculated by the calculation unit 13.

[0116] The main memory and auxiliary memory can also store programs for calculating strain and other parameters from the measurement data measured by the measurement unit 12. Furthermore, the main memory and auxiliary memory can store data on strain and other parameters calculated by the calculation unit 13, and can be used to calculate changes in strain and other parameters over time.

[0117] The calculation unit 13 may be formed by, for example, a personal computer (PC). Therefore, each part of the calculation unit 13 may be executed collaboratively by software and hardware in an information processing device such as a personal computer, by having the CPU execute a program that has been stored in advance. (5) Alarm section The measuring device 10 of this embodiment may further include an alarm unit 14. The alarm unit 14 can issue an alarm when one or more types of changes over time, selected from the axial force and tension force due to the multiple reinforcing members 20 calculated by the calculation unit 13, exceed a specified value.

[0118] The measuring device 10 of this embodiment has an alarm unit 14, which makes it possible to quickly notify the operator or manager if a problem occurs with the axial force or tension force caused by the reinforcing material 20.

[0119] The alarm unit 14 may have, for example, a display, lamp, buzzer, etc., to issue an alarm so that an operator or manager can recognize that a change in the state of the axial force, etc., of the reinforcing material 20 has occurred. The alarm unit 14 may be placed, for example, within the calculation unit 13 and function as the display, etc., of the calculation unit 13. (6)Location specifying section As shown in Figure 1, the measuring device 10 of this embodiment may also have a concrete structure 22 that is positioned to cover the slope 100 and the optical fiber 11 with protective members.

[0120] The concrete structure 22 can be manufactured by spraying mortar or cement onto the slope 100 or the optical fiber 11 with protective members, and allowing the mortar or cement to harden.

[0121] If the optical fiber 11 with protective material is covered by a concrete structure 22 or the like, the optical fiber 11 with protective material becomes invisible from the outside due to the concrete structure 22.

[0122] Therefore, the measuring device 10 of this embodiment may have a positioning unit 15 that identifies the position of the reinforcing material 20 on the first optical fiber 32 from the strain distribution along the longitudinal direction of the first optical fiber 32, which is measured by the measuring unit 12.

[0123] The strain distribution measured by the first optical fiber 32 of the optical fiber 11 with protective member shows increased strain in the area where the reinforcing material 20 is placed, allowing the location of the reinforcing material 20 to be identified from the strain distribution. The position identification unit 15 identifies the location of the reinforcing material 20 based on the strain distribution along the longitudinal direction of the first optical fiber 32, thereby accurately determining the axial force and tension of each reinforcing material 20.

[0124] The measuring device 10 of this embodiment may have a recording unit 16 that records positional information of the optical fibers with protective members 11, such as the arrangement of the optical fibers with protective members 11 on the slope 100 and the order of the reinforcing materials 20 on the optical fibers with protective members 11.

[0125] The position identification unit 15 may also take into account the position information of the first optical fiber 32 held by the recording unit 16, and determine the position of the reinforcing material 20 on the first optical fiber 32 from the strain distribution along the longitudinal direction of the first optical fiber 32.

[0126] The position identification unit 15 can accurately determine the position of the reinforcing material 20 on the first optical fiber 32 by taking into account the position information of the protected optical fiber 11 held by the recording unit 16 and determining the position of the reinforcing material 20 from the strain distribution along the longitudinal direction of the first optical fiber 32.

[0127] The location identification unit 15 and the recording unit 16 may be provided separately or as an integrated device. Alternatively, the calculation unit 13, the location identification unit 15, and the recording unit 16 may be integrated as a single device, either partially or entirely. For example, the recording unit 16 may be formed by an auxiliary storage device or the like provided by the calculation unit 13, and the location identification unit 15 may be formed by a CPU, main memory, auxiliary storage device, input / output interface, output device, etc., provided by the calculation unit 13.

[0128] The position identification unit 15 and the recording unit 16, like the calculation unit 13, may have a CPU, which is an arithmetic processing unit for performing necessary calculations, RAM or ROM, which are main memory devices, auxiliary memory devices, input / output interfaces, display devices, etc. Since the CPU and the like were explained in the calculation unit 13, the explanation will be omitted here.

[0129] The location identification unit 15 and the recording unit 16 may be formed by, for example, a personal computer (PC). Therefore, each part of the location identification unit 15 and the recording unit 16 may be realized through the cooperation of software and hardware, with the CPU executing a pre-stored program in an information processing device such as a personal computer. (7) Reinforcement Multiple reinforcing members 20 can be arranged so as to intersect the slope 100.

[0130] The reinforcing material 20 can apply compressive force to the ground including the slope 100, and by placing multiple reinforcing materials 20 on the slope 100, the shape of the slope 100 can be maintained and landslides and other problems can be prevented.

[0131] Ground anchors or rock bolts can be used as reinforcing material 20.

[0132] At least some of the multiple reinforcing members 20 can be fiber-optic reinforcing members 200 having a second optical fiber 23 arranged along the longitudinal direction of the reinforcing member 20. Alternatively, all of the reinforcing members 20 can have a second optical fiber 23 arranged along the longitudinal direction of the reinforcing member 20.

[0133] The first optical fiber 32 of the protective optical fiber 11 in the measuring device 10 of this embodiment can be used to measure one or more types of axial force and tension force selected from multiple reinforcing members 20. Since the measuring device 10 has a second optical fiber 23 arranged along the longitudinal side of the reinforcing member 20, if an abnormality is detected in the axial force or tension force of the reinforcing member 20 measured using the first optical fiber 32, for example, the strain distribution along the longitudinal side of the reinforcing member 20 where the abnormality was detected can be measured. For this reason, the measuring device 10 of this embodiment, having a second optical fiber 23 arranged along the longitudinal side of the reinforcing member 20, can measure the axial force and other forces of the reinforcing member 20 with greater precision.

[0134] The order of measurement is not limited to the above configuration. For example, one or more types of axial force and tension force selected from those along the longitudinal direction of the optical fiber-attached reinforcing material 200 can be measured using the second optical fiber 23. If an abnormality is detected in the axial force or tension force of the reinforcing material 20 measured using the second optical fiber 23, one or more types of axial force and tension force selected from those of multiple reinforcing materials 20 may be measured using the first optical fiber 32.

[0135] By combining the first optical fiber 32 and the second optical fiber 23 to measure the axial force and tension force of the reinforcing material 20, the labor required for measurement can be reduced while more accurately measuring and detecting the condition of the reinforcing material 20 and any abnormalities in the slope.

[0136] The strain distribution along the longitudinal direction of the second optical fiber 23 of the reinforcing material 20 may be measured by the measurement unit 12 including a scattered light measuring device, or a separate measurement unit for the reinforcing material including a scattered light measuring device may be provided to perform the measurement.

[0137] The second optical fiber 23 of the reinforcing material 20 can be the same optical fiber as the first optical fiber 32 described in the description of the optical fiber 11 with protective member, so its description is omitted.

[0138] The second optical fiber 23 can also be protected by covering a portion of its surface with a reinforcing material 20, for example. Specifically, if the reinforcing material 20 is a PC steel strand, the second optical fiber 23 may be placed in the strand groove of the strand. PC in PC steel strand is an abbreviation for Prestressed Concrete. [2] Method for measuring the condition of reinforcing materials The method for measuring the condition of the reinforcing material in this embodiment (hereinafter also referred to as the "measurement method") will now be described. The measurement method in this embodiment can be carried out using, for example, a measuring device according to one aspect of this disclosure. For this reason, some of the matters described in relation to the measuring device will be omitted from the explanation. (1) First measurement process The measurement method of this embodiment may include a first measurement step.

[0139] In the first measurement step, scattered light is emitted from the measurement unit 12, which includes a scattered light measuring device, into the first optical fiber 32 of the optical fiber 11 with a protective member, and one or more types of axial force and tension force applied to multiple reinforcing members 20 can be measured.

[0140] The optical fiber 11 with protective members may be positioned along the surface of the slope 100 in which the multiple reinforcing members 20 are driven, and passing through the area in which the multiple reinforcing members 20 are arranged.

[0141] The optical fiber 11 with a protective member may include, for example, a linear protective member 31 and a first optical fiber 32. At least a portion of the first optical fiber 32 is arranged along the longitudinal side of the protective member 31, and a portion of the surface of the first optical fiber 32 may be covered by the protective member 31.

[0142] In the first measurement step of the measurement method of this embodiment, scattered light can be emitted from a first optical fiber 32 having a protective member attached to an optical fiber 11 that is positioned along the surface of the slope 100 and passing through an area where multiple reinforcing members 20 are arranged. By emitting scattered light from the first optical fiber 32, the strain distribution along the longitudinal side of the first optical fiber 32 can be measured. Since the measured strain distribution reflects the axial force and tension force due to the multiple reinforcing members 20, the axial force and tension force due to the reinforcing members 20 can be easily measured by emitting scattered light from the first optical fiber 32 alone.

[0143] In the optical fiber 11 with a protective member, a portion of the surface of the first optical fiber 32 is covered by the protective member 31, thereby protecting the first optical fiber 32 and preventing damage.

[0144] The method for measuring strain and other values ​​using the first optical fiber 32 in the first measurement process will be explained below. (Regarding strain measurement) When measuring strain in the first measurement step, the strain at any position along the longitudinal direction of the first optical fiber, or the strain distribution along the longitudinal direction of the first optical fiber, can be measured. Furthermore, one or more types of axial force and tension force from multiple reinforcing members 20 can be determined from the strain distribution along the longitudinal direction of the first optical fiber 32.

[0145] The scattered light used for measuring strain is not particularly limited, but for example, one or more types selected from Brillouin scattered light, Rayleigh scattered light, and Raman scattered light may be used.

[0146] The strain measurement method is not particularly limited, but examples include one or more selected from BOCDA (Brillouin Optical Correlation Domain Analysis), BOTDR (Brillouin Optical Time Domain Reflectometry), FBG (Fiber Bragg Grating), BOTDA (Brillouin Optical Time Domain Analysis), BOCDR (Brillouin Optical Correlation Domain Reflectometry), etc.

[0147] The number of first optical fibers used when measuring strain in the first measurement step can be selected according to the measurement method. For example, when the measurement method is BOCDA or BOTDA, the number of first optical fibers should be an even number of two or more, while when the measurement method is BOTDR, FBG, or BOCDR, the number of first optical fibers may be one or more. (Regarding temperature measurement) In the first measurement step, temperature can also be measured. When measuring temperature in the first measurement step, the measurement step can measure the temperature at any position along the longitudinal direction of the first optical fiber, or the temperature distribution along the longitudinal direction of the first optical fiber.

[0148] The scattered light used for temperature measurement is not particularly limited, but for example, one or more types selected from Brillouin scattered light, Rayleigh scattered light, and Raman scattered light may be used.

[0149] The temperature measurement method is not particularly limited, but examples include one or more selected from BOCDA, BOTDR, FBG, BOTDA, BOCDR, ROTDR (Raman Optical Time Domain Reflectmeter), etc.

[0150] The number of first optical fibers used when measuring temperature in the first measurement step can be selected according to the measurement method, etc. For example, when the measurement method is BOCDA or BOTDA, the number of first optical fibers should be an even number of two or more, while when the measurement method is BOTDR, FBG, BOCDR, or ROTDR, the number of first optical fibers may be one or more. (2) Judgment process The measurement method of this embodiment may also include a determination step that determines the state of axial force and tension force due to the multiple reinforcing members 20 based on the measured values ​​obtained in the first measurement step.

[0151] The measurement method of this embodiment can also be performed repeatedly at predetermined intervals, for example. In the determination step, one or more types of changes over time selected from the axial force and tension force applied to the reinforcing material measured in the first measurement step are determined, and if the amount of change exceeds a predetermined value, it can be determined that there is an abnormality in the axial force, etc. In the determination step, if the amount of change is less than the predetermined value, it can be determined that there is no abnormality in the axial force, etc. and that it is normal.

[0152] The measurement method of this embodiment may further include any optional steps. (3) Correction process The measurement method of this embodiment may further include a correction step.

[0153] In the correction process, the strain measured in the first measurement process can be corrected using the temperature measured in the first measurement process.

[0154] In the correction process, the corrected strain can be calculated using, for example, the following equation (1).

[0155] (Corrected strain (%)) = (Measured strain (%)) - (Measured temperature (°C)) × (Temperature coefficient (% / °C)) ... (1) In equation (1), the "measured temperature" can be replaced with the temperature change from a reference temperature.

[0156] The temperature coefficient can be calculated in advance, for example, using the same optical fiber used for measurement, based on the relationship between a known temperature and a known strain.

[0157] By performing a correction process, the measured strain and strain distribution can be corrected by temperature, allowing for particularly accurate strain measurement. (4) Second measurement process At least some of the multiple reinforcing members may be fiber-optic reinforcing members 200 having a second optical fiber arranged along the longitudinal side of the reinforcing member.

[0158] In this case, the measurement method of this embodiment may further include a second measurement step. The conditions for performing the second measurement step are not particularly limited, but for example, it may be performed when the measured value measured in the first measurement step is outside a predetermined range. The second measurement step may also be performed when it is determined in the determination step that there is an abnormality in the axial force of the reinforcing material 20, etc.

[0159] In the second measurement step, for example, one or more types of forces selected from the axial force and tension force along the longitudinal direction of the optical fiber-equipped reinforcing material 200 may be measured using the second optical fiber 23 of the optical fiber-equipped reinforcing material 200. By measuring the axial force, etc. along the longitudinal direction of the reinforcing material in the second measurement step, the axial force, etc. of the reinforcing material 20 can be evaluated particularly accurately.

[0160] If the results of the second measurement process show no abnormalities in the axial force or tension of the reinforcing member 20, the measurement results from the first measurement process may be corrected. If abnormalities are found in the axial force or other aspects of the reinforcing member 20 as a result of the second measurement process, the reinforcing member 20 may be replaced or the tension or other aspects may be reintroduced.

[0161] The order in which the first and second measurement steps are performed is not limited to the above configuration.

[0162] For example, if the measurement value obtained in the second measurement step is outside a predetermined range, the first measurement step may be performed.

[0163] If the results of the first measurement process show no abnormalities in the axial force or tension of the reinforcing material 20, the second measurement process may be repeated, or the measurement results from the second measurement process may be corrected. If the results of the first measurement process show abnormalities in the measured values ​​of the axial force or tension of the reinforcing material 20, the reinforcing material 20 may be replaced, or the tension may be reintroduced.

[0164] In the first measurement step, strain and other parameters can be measured over a wider area of ​​the slope surface 100 than in the second measurement step. Therefore, information about the reinforcing material 20 and its surroundings can be obtained, and abnormalities in the slope can be detected.

[0165] Therefore, by combining the first measurement process and the second measurement process, and performing the first measurement process only when an abnormality is detected in the measurement value during the second measurement process, the labor required for measurement can be reduced while more accurately measuring and detecting the condition of the reinforcing material 20 and any abnormalities in the slope. (5) Measurement process for concrete structures The measurement method of this embodiment may also include a concrete structure measurement step.

[0166] In the concrete structure measurement process, Rayleigh scattered light can be emitted from a second optical fiber positioned along the longitudinal side of the reinforcing material 20, and the Poisson strain of the concrete structure 22 due to fluctuations in the tension of the reinforcing material 20 can also be measured. [3] Method for manufacturing a device for measuring the condition of reinforcing materials The method for manufacturing the measuring device of this embodiment will now be described. According to the method for manufacturing the measuring device of this embodiment, a measuring device according to one aspect of the present disclosure can be manufactured. For this reason, some of the matters described in the measuring device and measurement method will be omitted. (1) Optical fiber placement process, fixing member installation process The manufacturing method of the measuring device of this embodiment may include a step of arranging optical fibers with protective members.

[0167] In the optical fiber placement process with protective members, the optical fiber 11 with protective members can be placed along the surface of the slope 100 in which multiple reinforcing members 20 are driven, and passing through the area in which the multiple reinforcing members 20 are placed.

[0168] The optical fiber with protective member 11 used in the optical fiber with protective member placement process may have a linear protective member 31 and a first optical fiber 32. At least a portion of the first optical fiber 32 may be arranged along the longitudinal side of the protective member 31, and a portion of its surface may be covered by the protective member 31.

[0169] According to the reinforcing material condition measuring device manufactured by the manufacturing method of this embodiment, the strain distribution along the longitudinal direction of the first optical fiber 32 can be measured by emitting scattered light into the first optical fiber 32 of the optical fiber 11 with a protective member. Since the measured strain distribution reflects the axial force and tension of multiple reinforcing materials, the axial force and tension of the reinforcing materials can be easily measured simply by emitting scattered light into the optical fiber.

[0170] In the optical fiber 11 with a protective member, a portion of the surface of the first optical fiber 32 is covered by the protective member 31, thereby protecting the first optical fiber 32 and preventing damage.

[0171] In the optical fiber placement process with protective members, for example, as shown in Figure 1, the optical fiber 11 with protective members can be placed on the surface of the slope 100 so as to have a folded portion 111. Alternatively, in the optical fiber placement process with protective members, multiple optical fibers 11 with protective members can be placed along the surface of the slope 100.

[0172] In the process of arranging optical fibers with protective members, the method of arranging and fixing the optical fibers 11 with protective members on the slope 100 is not particularly limited, but they may be fixed, for example, by fixing members 41 that have been previously installed on the surface of the slope 100.

[0173] When the fixing member 41 is placed on the surface of the slope 100, the manufacturing method of the measuring device in this embodiment may also include a fixing member placement step in which the fixing member 41 is placed along the surface of the slope 100. In the fixing member placement step, the fixing member 41 can be placed along the surface of the slope 100 and fixed in place. (2) Optical fiber position recording process with protective member The manufacturing method of the measuring device in this embodiment may also include a step for recording the position of an optical fiber with a protective member.

[0174] The optical fiber with protective member position recording process can record the position of the optical fiber with protective member on the slope 100. The position of the optical fiber with protective member 11 recorded in the optical fiber with protective member position recording process can be recorded and stored, for example, in a recording unit 16 of a measuring device according to one aspect of this disclosure.

[0175] The manufacturing method of the measuring device in this embodiment includes a step for recording the position of the optical fiber with a protective member, and by recording the position information of the optical fiber 11 with a protective member on the slope 100, the position of the reinforcing member 20 on the first optical fiber 32 can be identified with particular accuracy. Therefore, the state of the reinforcing member 20, such as its axial force, can be evaluated with particular accuracy using the measurement results of the reinforcing member 20, such as its axial force, obtained in the measurement step. (3) Spraying process The manufacturing method of the measuring device of this embodiment may also include a spraying step.

[0176] In the spraying process, mortar or concrete can be sprayed to cover the slope 100 and the optical fiber 11 with protective members. Once the sprayed mortar or concrete hardens, it can be formed into a concrete structure 22.

[0177] By performing a spraying process, a concrete structure 22 can be manufactured to cover the optical fiber 11 with protective material. This protects the first optical fiber 32 and the slope 100, and improves the shape stability of the slope 100. [Explanation of symbols]

[0178] 10. Measuring device (device for measuring the condition of reinforcing material) 100 slope 11. Optical fiber with protective components 11A Optical fiber with first protective component 11B Optical fiber with second protective component 111 Folded section 12 Measuring part 13 Calculation Section 14 Alarm section 15 Location identification part 16 Records Section 20 Reinforcement material 200 Fiber optic reinforcement 21 Pressure plate 21A end 22 Concrete structures 23. Second Optical Fiber L211A straight line L211B straight line L212A Perpendicular line L212B Perpendicular line θ angle A1 area A2 area L30 tangent 31 Protective component 32 First Optical Fiber 321 First Optical Fiber 322 First Optical Fiber 33 Optical fiber housing 34 stranded wire 341 strands 341A Center wire 341B Perimeter wire 35 twisted grooves 41 Fixing member

Claims

1. It has optical fibers with protective members arranged along the surface of the slope, Multiple reinforcing members are driven into the slope so as to intersect with the slope, and the optical fiber with protective member is arranged so as to pass through the area where the multiple reinforcing members are located. The optical fiber with the protective member comprises a linear protective member and a first optical fiber. A reinforcing material condition measuring device wherein at least a portion of the first optical fiber is arranged along the longitudinal side of the protective member, and a portion of its surface is covered by the protective member.

2. The reinforcing material condition measuring device according to claim 1, wherein the protective member is a metal wire.

3. The aforementioned metal wire includes a stranded wire made by twisting together individual metal wires. The reinforcing material condition measuring device according to claim 2, wherein the first optical fiber is arranged in the twist groove of the stranded wire.

4. The reinforcing material condition measuring device according to any one of claims 1 to 3, comprising a plurality of optical fibers with the protective member.

5. A reinforcement condition measuring device according to any one of claims 1 to 3, wherein a pressure receiving plate is placed at each end of the plurality of reinforcing members, and the optical fiber with protective member is arranged so as to pass through the area sandwiched between the pressure receiving plate and the slope for the plurality of reinforcing members.

6. The reinforcing material condition measuring device according to any one of claims 1 to 3, wherein at least a portion of the plurality of reinforcing materials is a fiber-optic reinforcing material having a second optical fiber arranged along the longitudinal direction of the reinforcing material.

7. The reinforcing material condition measuring device according to any one of claims 1 to 3, further comprising a measuring unit including a scattered light measuring device connected to the first optical fiber.

8. The reinforcing material state measuring device according to claim 7, further comprising a positioning unit that identifies the positions of the plurality of reinforcing materials on the first optical fiber from the strain distribution along the longitudinal direction of the first optical fiber measured by the measurement unit.

9. The aforementioned measuring unit performs measurements multiple times at predetermined intervals. The reinforcing material state measuring device according to claim 7, further comprising a calculation unit that calculates one or more types of changes over time selected from the axial force and tension force due to the plurality of reinforcing materials, based on the change in the strain distribution along the longitudinal direction of the first optical fiber measured by the measurement unit.

10. The reinforcing material condition measuring device according to claim 9, further comprising an alarm unit that issues an alarm when one or more types of changes in the range of change over time, selected from the axial force and tension force of the plurality of reinforcing materials calculated by the calculation unit, exceed a specified value.

11. The first optical fiber, which has a protective member attached and is positioned along the surface of a slope where multiple reinforcing members are driven in, and passes through the area where the multiple reinforcing members are arranged, emits scattered light from a measuring unit including a scattered light measuring device, and measures one or more types selected from the axial force and tension force applied to the multiple reinforcing members, The optical fiber with the protective member comprises a linear protective member and the first optical fiber. A method for measuring the condition of a reinforcing material, wherein at least a portion of the first optical fiber is arranged along the longitudinal side of the protective member, and a portion of its surface is covered by the protective member.

12. At least a portion of the plurality of reinforcing members is a fiber-optic reinforcing member having a second optical fiber arranged along the longitudinal side of the reinforcing member, The method for measuring the condition of a reinforcing material according to claim 11, further comprising a second measurement step, in which, if the measured value obtained in the first measurement step is outside a predetermined range, one or more types selected from axial force and tension force along the longitudinal direction of the reinforcing material with optical fibers are measured using the second optical fiber of the reinforcing material with optical fibers.

13. At least a portion of the plurality of reinforcing members is a fiber-optic reinforcing member having a second optical fiber arranged along the longitudinal side of the reinforcing member, A method for measuring the condition of a reinforcing material according to claim 11, further comprising a second measurement step of measuring one or more selected from axial force and tension force along the longitudinal direction of the reinforcing material with optical fibers using the second optical fiber having the reinforcing material with optical fibers, and if the measured value measured in the second measurement step is outside a predetermined range, the first measurement step is performed.

14. The process includes a step of arranging optical fibers with protective members so as to be along the surface of a slope where multiple reinforcing members have been driven in, and so as to pass through the area where the multiple reinforcing members are arranged. The optical fiber with the protective member comprises a linear protective member and a first optical fiber. A method for manufacturing a reinforcing material condition measuring device, wherein at least a portion of the first optical fiber is arranged along the longitudinal side of the protective member, and a portion of its surface is covered by the protective member.

15. A method for manufacturing a reinforcing material condition measuring device according to claim 14, comprising a spraying step of spraying mortar or concrete so as to cover the optical fiber with the protective member.

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