Bearing plate, anchoring structure

Abstract

To provide a bearing plate that facilitates the alignment of the fixing device. [Solution] A bearing plate disposed between a fixing device installed at the end of a tensioning member and a concrete structure, wherein the bearing plate has a first end facing the concrete structure, a second end located opposite the first end and facing the fixing device, and a through hole that penetrates between the first end and the second end and into which the tensioning member is inserted, the second end having a recess for fitting a part of the fixing device, and the opening of the through hole at the second end is located within the recess.

Description

Technical Field

[0001] The present disclosure relates to a pressure plate and a fixing structure.

Background Art

[0002] Patent Document 1 discloses a pressure plate that forms part of a fixture for introducing prestress into a concrete structure using a pre-grouted PC tendon.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Concrete structures have the characteristic of being weak against tensile forces. Therefore, in order to control the tensile stress when the concrete structure receives a load and prevent cracks and the like from occurring, tendons are used by applying a compressive force to the concrete structure in advance.

[0005] When installing a tendon in a concrete structure and applying a compressive force to the concrete structure, for example, after installing a fixture or a pressure plate at the end of the tendon, a tensile force is introduced into the tendon.

[0006] The pressure plate is a plate-like member disposed between the fixture and the concrete structure, and has a through-hole for inserting the tendon. The pressure plate supports the fixture, and the tensile force introduced into the tendon is transmitted to the concrete structure by the fixture and the pressure plate, and a compressive force is applied to the concrete structure.

[0007] Typically, the inner diameter of the through-holes in the bearing plate is considerably larger than the outer diameter of the tensioning member, making it difficult to determine the precise position of the anchoring device installed on the tensioning member. Therefore, aligning the anchoring device on the bearing plate to its designed position sometimes required the skills of the operator.

[0008] If the position of the anchoring device on the bearing plate deviates from the design position, the anchoring device cannot apply compressive force evenly to the bearing plate, and consequently, the compressive force on the concrete structure may not be applied evenly, potentially causing variations in the magnitude of the compressive force depending on the location. Variations in the compressive force applied to the concrete structure can lead to a shortened lifespan of the concrete structure.

[0009] Therefore, there was a need for a bearing plate that could easily align the anchoring device installed on the bearing plate.

[0010] The purpose of this disclosure is to provide a bearing plate that facilitates the alignment of the fixing device. [Means for solving the problem]

[0011] The bearing plate of the present disclosure is a bearing plate disposed between a fixing device installed at the end of a tensioning member and a concrete structure, wherein the bearing plate has a first end facing the concrete structure, a second end located opposite the first end and facing the fixing device, and a through hole that penetrates between the first end and the second end and into which the tensioning member is inserted, the second end having a recess for fitting a part of the fixing device, and the opening of the through hole at the second end is located within the recess. [Effects of the Invention]

[0012] According to this disclosure, a bearing plate that facilitates the alignment of the fixing device can be provided. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 is an explanatory diagram of an anchoring structure using a bearing plate according to one aspect of the present disclosure, and is a cross-sectional view taken along the central axis of the tensioning member. [Figure 2] Figure 2 is a cross-sectional view of a bearing plate according to one embodiment of the present disclosure. [Figure 3] Figure 3 is a cross-sectional view of a bearing plate according to one aspect of the present disclosure. [Figure 4] Figure 4 is a top view of a bearing plate according to one embodiment of the present disclosure. [Figure 5] Figure 5 is a top view of a bearing plate according to one embodiment of the present disclosure. [Figure 6] Figure 6 is an explanatory diagram of a fixing structure having a cap according to one aspect of the present disclosure, and is a cross-sectional view taken in a plane along the central axis of the tensioning member. [Figure 7] Figure 7 is an explanatory diagram of one example of a cap configuration. [Figure 8] Figure 8 is an explanatory diagram of other cap configuration examples. [Modes for carrying out the invention]

[0014] The implementation methods are described below.

[0015] [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.

[0016] (1) A bearing plate according to one aspect of the present disclosure is a bearing plate disposed between a fixing device installed at the end of a tensioning member and a concrete structure, wherein the bearing plate has a first end facing the concrete structure, a second end located opposite the first end and facing the fixing device, and a through hole that penetrates between the first end and the second end and into which the tensioning member is inserted, the second end has a recess for fitting a part of the fixing device, and the opening of the through hole at the second end is located within the recess.

[0017] The pressure plate according to one aspect of the present disclosure has a recess for fitting a part of the fixture at the second end facing the fixture, so that the alignment of the fixture at the second end of the pressure plate can be facilitated and the burden on the operator during construction can be reduced.

[0018] (2) In (1), the second end portion may have a convex portion that surrounds the recess and protrudes more than other portions.

[0019] Since the pressure plate according to one aspect of the present disclosure has a convex portion that surrounds the recess at the second end portion, by placing concrete in the formwork with the convex portion applied to the formwork, the entire pressure plate can be easily installed in the concrete structure. By installing the pressure plate in the concrete structure, the exposed surface of the pressure plate can be reduced, and the work of rust prevention treatment for the pressure plate can be reduced.

[0020] After installing the tensioning material, in order to protect the fixture and the like, it is required to place concrete around the fixture so as to have a predetermined thickness. By installing the pressure plate in the concrete structure, it becomes possible to reduce the thickness of the concrete placed around the fixture as compared with the case where the pressure plate is installed on the surface of the concrete structure.

[0021] (3) In (2), when the second end portion is viewed along the central axis of the through hole, the convex portion may be arranged annularly along the outer periphery of the recess.

[0022] Normally, since the shape of the surface of the fixture facing the pressure plate is circular, by arranging the convex portions annularly, it becomes easier to install the fixture in the recess.

[0023] (4) In (2) or (3), the convex portion may be divided into a plurality along the outer periphery of the recess.

[0024] Since the convex portion is divided into a plurality, the amount of material required for the convex portion and the pressure plate can be reduced, and the cost and weight can be reduced.

[0025] (5) An anchoring structure according to one aspect of the present disclosure comprises an anchoring device installed at the end of a tensioning member that introduces tension to a concrete structure, and a bearing plate disposed between the anchoring device and the concrete structure, wherein the bearing plate has a first end facing the concrete structure, a second end located opposite the first end and facing the anchoring device, and a through hole that penetrates between the first end and the second end and into which the tensioning member is inserted, the second end has a recess into which a part of the anchoring device is fitted, the opening of the through hole at the second end is located in the recess, and a part of the anchoring device is fitted into the recess.

[0026] The bearing plate of the anchoring structure according to one aspect of this disclosure has a recess at its second end facing the anchoring device for fitting a part of the anchoring device. Therefore, the positioning of the anchoring device at the second end of the bearing plate can be easily adjusted, and the burden on the worker during installation can be reduced.

[0027] Furthermore, according to one aspect of the anchoring structure of this disclosure, it becomes possible to position the anchoring device at the second end of the bearing plate in the position specified in the design. As a result, the tensioning material and anchoring device can apply compressive force evenly to the bearing plate and the concrete structure, thereby extending the lifespan of the concrete structure.

[0028] (6) In (5), the entire bearing plate is placed within the concrete structure, and in a cross section along the central axis of the tensioning member, the position of the surface of the recess that supports the anchoring device and the position of the surface of the concrete structure on which the bearing plate is placed, along the longitudinal direction of the tensioning member, may be different.

[0029] By positioning the entire bearing plate within a concrete structure, the exposed portion of the bearing plate can be reduced, thereby decreasing the amount of rust prevention treatment required for the bearing plate.

[0030] After the tensioning material is installed, concrete is required to be poured around the anchoring device to a specified thickness from the bearing plate in order to protect the anchoring device. By installing the bearing plate within the concrete structure, it becomes possible to reduce the thickness of the concrete poured around the anchoring device compared to when the bearing plate is installed on the surface of the concrete structure.

[0031] (7) In (5) or (6), a cap may be further provided to cover the exposed portion of the fixing device and the exposed portion of the bearing plate.

[0032] By covering the exposed parts of the fixing device and the bearing plate with caps, these parts can be protected by the caps. Furthermore, rust prevention treatment can be omitted for the exposed parts of the fixing device and the bearing plate, thereby increasing productivity.

[0033] (8) In (7), the cap has at least a first cap and a second cap along the longitudinal side of the tensioning member, and the first cap may cover only the exposed portion of the tensioning member and a portion of the end face and side of the fixing device.

[0034] By forming the cap from multiple components, such as a first cap and a second cap, it can be easily replaced even if a part of the cap is damaged. Furthermore, since tensioning materials and the ends of fixing devices can have complex shapes, forming the cap from multiple components can increase the productivity of cap production.

[0035] Furthermore, conventionally, caps were sometimes used to protect the ends of tensioning materials, covering both the ends of the tensioning materials and a portion of the fixing device. Therefore, by forming the cap from multiple components, it becomes possible to combine it with conventionally used products to create the cap, thereby reducing costs.

[0036] (9) In (7) or (8), there may be a gap between the inner wall of the cap and the side surface of the fixing device.

[0037] By creating a gap between the inner wall of the cap and the side of the fixing device, the ease of installation of the cap can be improved.

[0038] The space between the cap and the fixing device can also be filled with resin. Therefore, by having a gap between the inner wall of the cap and the side of the fixing device, the gap can be easily filled with resin.

[0039] (10) In any of (7) to (9). The cap may further have a fastener for fixing it to the fixing device.

[0040] By securing the cap to the fixing device with a fastener, the cap can be firmly fixed to the fixing device, preventing the cap from falling off or water or other substances from entering between the cap and the fixing device.

[0041] [Details of the embodiments of this disclosure] Specific examples of bearing plates and anchoring structures according to one embodiment of this disclosure (hereinafter referred to as "this embodiment") will be described below with reference to the drawings. The present invention is not limited to these examples and is intended to be shown in the claims, with all modifications in the sense and scope equivalent to the claims being included.

[0042] In this specification, the names of components and parts may be described with prefixes such as "first," "second," etc., such as "first end," "second end," "first cap," and "second cap." These prefixes are merely used to identify each component and prevent confusion during description, and do not indicate arrangement, priority, or anything of the sort. Therefore, if there is no particular risk of confusion, they can simply be described as "end" or "cap."

[0043] Furthermore, the drawings used in this explanation are schematic representations illustrating configuration examples such as the arrangement of components included in a bearing plate or anchoring structure according to one embodiment of this disclosure, and do not accurately show the lengths of each part or their ratios. [Bearing plate] (1) Regarding the installation method of the bearing plate Before describing the bearing plate of this embodiment, the installation method of the bearing plate of this embodiment will be explained using Figure 1. In Figure 1, the X-axis is the axis along the longitudinal side of the tensioning member 13, and the YZ plane is the plane perpendicular to the longitudinal side of the tensioning member 13.

[0044] Figure 1 is an explanatory diagram showing the state in which tension force is introduced to a tensioning member 13 placed within a concrete structure 11, and the tensioning member 13 is fixed to the concrete structure 11 by an anchoring device 14. It schematically shows a cross-sectional view of the tensioning member 13 along the central axis CA1. Figure 1 also serves as an explanatory diagram of the anchoring structure 10 using the bearing plate 15 of this embodiment, and will be used when explaining the anchoring structure.

[0045] The tensioning member 13 may be placed within the concrete structure 11 so as to be in direct contact with the concrete structure 11, or it may be placed within a sheath 12 installed within the concrete structure 11. Grout may be filled between the sheath 12 and the tensioning member 13. Examples of grout include cement milk and resin-based grout.

[0046] The tensioning material 13 is a tensioning material for introducing prestress, specifically compressive force, to the concrete structure 11. It can be a PC steel material such as a PC steel strand made by twisting together multiple strands, a PC steel bar, or a carbon fiber composite material. As the tensioning material, a pre-grouted PC steel material can also be used, in which a sheath is attached to the PC steel material in advance and resin is filled between the sheath and the PC steel material. The "PC" in the above-mentioned PC steel strand, etc., stands for prestressed concrete.

[0047] In Figure 1, the end portion 13A of the tensioning member 13 along its longitudinal direction is held by the fixing device 14.

[0048] The structure of the fixing device 14 is not particularly limited and can be selected according to the type of tensioning material 13, etc. The fixing device 14 shown in Figure 1 has a male cone 141 and a female cone 142. The tensioning material 13 is inserted into the frustoconical, i.e., tapered through hole 142A of the female cone 142. The fixing device 14 is then fixed to the tensioning material 13 by press-fitting the male cone 141 between the tensioning material 13 and the female cone 142 within the through hole 142A.

[0049] The tensioning member 13 is pulled along its longitudinal direction, and tension is applied to it. As a result, a force is applied to the tensioning member 13 that causes it to contract along its longitudinal direction.

[0050] A bearing plate 15 is positioned between the concrete structure 11 and the anchoring device 14. The bearing plate 15 is installed on the surface 11A from which the tensioning member 13 is removed from the concrete structure 11, and can support the tensioning force introduced into the tensioning member 13. The bearing plate 15 has a through hole 151 in the center through which the tensioning member 13 passes, and is also called a casting plate.

[0051] The bearing plate 15 supports the anchoring device 14 and transmits the force applied to the tensioning member 13, which is trying to contract along its length, to the concrete structure 11, thereby applying a compressive force to the concrete structure 11. (2) Regarding the bearing plate As explained with reference to Figure 1, the bearing plate 15 of this embodiment can be positioned between the anchoring device 14 installed on the end 13A of the tensioning member 13 that introduces tension to the concrete structure 11, and the concrete structure 11. The bearing plate 15 can transmit the tension introduced to the tensioning member 13 as a compressive force to the concrete structure 11 together with the anchoring device 14.

[0052] Figures 2 and 3 show examples of cross-sectional views of the bearing plate 15 of this embodiment as seen from the plane passing through the through-hole 151, and Figures 4 and 5 show examples of top views of the bearing plate 15 of this embodiment. Figure 4 is a view of the second end 15B along the central axis CA2 of the through-hole 151 in Figure 2, that is, a view of the second end 15B along the block arrow 20. The cross-sectional view along line BB in Figure 4 corresponds to Figure 2.

[0053] Figures 3 and 5 are modified examples of the configuration shown in Figures 2 and 4, respectively. Therefore, the bearing plate of this embodiment will be explained mainly using Figures 2 and 4, and Figures 3 and 5 will be used as needed.

[0054] The bearing plate 15 of this embodiment has a first end 15A that faces the concrete structure 11 when installed on the concrete structure 11, and a second end 15B that is located opposite the first end 15A and faces the anchoring device 14.

[0055] As is clear from Figures 2 and 3, the first end portion 15A and the second end portion 15B may be flat surfaces, but they may also include recesses 152, etc., that are relatively lower than adjacent members, and thus have irregularities on their surfaces. (Through hole) The bearing plate 15 of this embodiment has a through hole 151 that penetrates between the first end 15A and the second end 15B, into which the tensioning member 13 is inserted.

[0056] The inner diameter D151 of the through hole 151 is not particularly limited. The inner diameter D151 of the through hole 151 only needs to be larger than the outer diameter of the tensioning member 13 inserted into the through hole 151, for example, it may be 1.1 times or more the outer diameter of the tensioning member 13, or 1.2 times or more. By making the inner diameter D151 of the through hole 151 1.1 times or more the outer diameter of the tensioning member 13 inserted into the through hole 151, the workability when inserting the tensioning member 13 into the through hole 151 can be improved. In addition, it is possible to prevent the tensioning member 13 from coming into contact with the inner circumferential surface of the through hole 151 and being damaged.

[0057] The upper limit of the inner diameter D151 of the through hole 151 is not particularly limited, but may be 2.0 times or less the outer diameter of the tensioning member 13 inserted into the through hole 151, or 1.8 times or less. By setting the inner diameter D151 of the through hole 151 to 2.0 times or less the outer diameter of the tensioning member 13 inserted into the through hole 151, the strength of the bearing plate 15 can be increased and its durability can be improved.

[0058] Therefore, the inner diameter D151 of the through hole 151 may be, for example, 1.1 times or more and 2.0 times or less the outer diameter of the tensioning member 13, or 1.2 times or more and 1.8 times or less. (recess) The second end portion 15B of the bearing plate 15 in this embodiment may have a recess 152 into which a part of the fixing device 14 is fitted, that is, into which a part of the fixing device 14 is inserted. The opening 151A of the through hole 151 in the second end portion 15B can be positioned within the recess 152.

[0059] The bearing plate 15 has a recess 152 at its second end 15B, which faces the anchoring device 14, into which a part of the anchoring device 14 can be fitted. This makes it easy to align the anchoring device 14 at the second end 15B of the bearing plate 15, thereby reducing the burden on workers during installation.

[0060] The recess 152 represents a portion that is relatively lower than the adjacent member. For this reason, as shown in Figures 2 and 4, for example, the second end portion 15B may have a protrusion 153 that surrounds the recess 152 and protrudes more than other parts of the second end portion 15B, and the recess 152 may be defined by the protrusion 153.

[0061] Furthermore, as shown in Figure 3, the recess 152 may be a portion of the second end 15B that is relatively lower than the other parts, i.e., a recessed portion.

[0062] The depth L152 of the recess 152 is not particularly limited, and should be such that when the fixing device 14 is placed on the second end 15B of the bearing plate 15, the worker can easily identify the recess 152 and easily fit a part of the fixing device 14 into the recess 152.

[0063] The depth L152 of the recess 152 may be, for example, 1 mm or more and 20 mm or less, 3 mm or more and 20 mm or less, or 2 mm or more and 5 mm or less. By making the depth L152 of the recess 152 1 mm or more, when the fixing device 14 is placed on the second end 15B of the bearing plate 15, the worker can easily identify the recess 152 and easily fit a part of the fixing device 14 into the recess 152.

[0064] By making the depth L152 of the recess 152 20 mm or less, the workability when fitting a part of the fixing device 14 into the recess 152 can be improved. In addition, the time required to process the recess 152 when manufacturing the fixing device 14 can be shortened, thereby increasing productivity.

[0065] The inner diameter D152 of the recess 152 is not particularly limited. The inner diameter D152 of the recess 152 only needs to be larger than the outer diameter of the fixing device 14 inserted into the recess 152, for example, it may be 1.01 times or more the outer diameter of the fixing device 14, or 1.05 times or more. By making the inner diameter D152 of the recess 152 1.01 times or more the outer diameter of the fixing device 14 fitted into the recess 152, the workability when inserting the fixing device 14 into the recess 152 can be improved.

[0066] The upper limit of the inner diameter D152 of the recess 152 is not particularly limited, but may be 1.2 times or less the outer diameter of the fixing device 14 inserted into the recess 152, or 1.1 times or less. By making the inner diameter D152 of the recess 152 1.2 times or less the outer diameter of the fixing device 14 inserted into the recess 152, the gap between the recess 152 and the fixing device 14 can be reduced, and the amount of displacement after the fixing device 14 is fitted into the recess 152 can be reduced, thereby improving the installation accuracy of the fixing device 14.

[0067] Therefore, the inner diameter D152 of the recess 152 may be, for example, 1.01 times or more and 1.2 times or less the outer diameter of the fixing device 14, or 1.05 times or more and 1.1 times or less.

[0068] The bottom surface 152A of the recess 152 can be given a different color or pattern from the rest of the recess. By giving the bottom surface 152A of the recess 152 a different color or pattern from the rest of the recess, it becomes possible to visually confirm that the fixing device 14 is fitted inside the recess 152. (Convex part) As shown in Figures 2 and 4, the second end portion 15B of the bearing plate 15 may have a protrusion 153 that surrounds the recess 152 and protrudes more than the other portion. The recess 152 is a portion that is relatively lower than the adjacent protrusion 153 and is defined by the protrusion 153.

[0069] In this embodiment, the bearing plate 15 has a protrusion 153 surrounding a recess 152 at the second end 15B. By placing the protrusion 153 against the formwork and pouring concrete into the formwork, the entire bearing plate 15 can be easily installed inside the concrete structure 11. By installing the bearing plate 15 inside the concrete structure 11, the exposed portion of the bearing plate 15 can be reduced, and the work required for rust prevention treatment of the bearing plate 15 can be reduced.

[0070] After installing the tensioning member 13, it is required to pour concrete around the anchoring device 14 to a predetermined thickness from the bearing plate 15 in order to protect the anchoring device 14, etc. By installing the bearing plate 15 inside the concrete structure 11, it becomes possible to reduce the thickness of the concrete poured around the anchoring device 14 compared to when the bearing plate 15 is installed on the surface of the concrete structure 11.

[0071] As shown in Figure 4, when the second end 15B is viewed along the central axis CA2 of the through hole 151, the convex portion 153 may be arranged in an annular shape along the outer circumference of the concave portion 152.

[0072] Since the surface of the fixing device 14 facing the bearing plate 15 is normally circular, arranging the convex portion 153 in a ring makes it easier to install the fixing device 14 in the recess 152.

[0073] When the second end portion 15B is viewed along the central axis CA2 of the through hole 151, the protrusion 153 may have a continuous shape as shown in Figure 4, but as shown in Figure 5, the protrusion 153 may be divided into multiple parts along the outer circumference of the recess 152. That is, the protrusion 153 may be divided by gaps 50 such as slits.

[0074] Because the protrusion 153 is divided into multiple parts, the amount of material required for the protrusion 153 and the bearing plate 15 can be reduced, thereby reducing costs and weight. (3) Materials for the bearing plate The material of the bearing plate is not particularly limited, but metal materials can be used. Examples of bearing plate materials include iron and steel, and carbon steel can also be used. Using carbon steel as the material for the bearing plate can increase its strength and hardness.

[0075] As the carbon steel, one or more types selected from chromium-molybdenum steel (SCM), ductile cast iron (FCD), general structural rolled steel (SS), welded structural rolled steel (SM), machine structural carbon steel (SC), etc. may be used.

[0076] The bearing plate may have a plating coating or the like on its surface. [Fixing structure] The fixing structure of this embodiment will now be described.

[0077] The anchoring structure in this embodiment is a structure for fixing and anchoring the tensioning member 13 to the concrete structure 11.

[0078] Therefore, as shown in Figure 1, the anchoring structure 10 of this embodiment includes an anchoring device 14 installed at the end 13A of a tensioning member 13 that introduces tension to the concrete structure 11, and a bearing plate 15 positioned between the anchoring device 14 and the concrete structure 11.

[0079] The fixing device 14 and the bearing plate 15 have already been explained, so their explanation will be omitted here.

[0080] In the anchoring structure 10 of this embodiment, the bearing plate 15 has a recess 152 at its second end 15B. In the anchoring device structure 10, a part of the anchoring device 14 is fitted into the recess 152 of the bearing plate 15.

[0081] The bearing plate 15 of the anchoring structure according to one aspect of this disclosure has a recess 152 at a second end 15B facing the anchoring device 14 into which a part of the anchoring device 14 is fitted. Therefore, the positioning of the anchoring device 14 at the second end 15B of the bearing plate can be easily made, and the burden on the worker during installation can be reduced.

[0082] Furthermore, according to one aspect of the anchoring structure of this disclosure, it becomes possible to position the anchoring device 14 at the second end 15B of the bearing plate 15 in the position specified in the design. As a result, the tensioning material and anchoring device can apply compressive force evenly to the bearing plate and the concrete structure, thereby extending the lifespan of the concrete structure.

[0083] As shown in Figure 1, in the anchoring structure 10 of this embodiment, the bearing plate 15 may be entirely placed inside the concrete structure 11. In the anchoring structure 10 of this embodiment, the position of the bottom surface 152A, which is the surface that supports the anchoring device 14 in the recess 152, and the surface 11A of the concrete structure 11 on which the bearing plate 15 is placed, along the longitudinal direction of the tensioning member 13 may be different in a cross-section along the central axis CA1 of the tensioning member 13. The position along the longitudinal direction of the tensioning member 13 refers to the position along the X-axis in Figure 1.

[0084] In the anchoring structure 10 of this embodiment, the entire bearing plate 15 is placed inside the concrete structure 11, which reduces the exposed portion of the bearing plate 15 and thus reduces the amount of rust prevention treatment work required for the bearing plate 15.

[0085] After installing the tensioning member 13, it is required to pour concrete around the anchoring device 14 to a predetermined thickness from the bearing plate 15 in order to protect the anchoring device 14, etc. By installing the bearing plate 15 inside the concrete structure 11, it becomes possible to reduce the thickness of the concrete poured around the anchoring device 14 compared to when the bearing plate 15 is installed on the surface of the concrete structure 11.

[0086] The statement that the entire bearing plate 15 is located within the concrete structure 11 means that the portion of the bearing plate 15 from the first end 15A to the second end 15B is located within the concrete structure 11. However, this does not exclude the possibility that, for example, a portion of the surface of the protrusion 153 included in the second end 15B may be exposed from the concrete structure 11. (cap) As shown in Figure 6, the fixing structure 10 of this embodiment may have a cap 61 that covers the exposed portion 601 of the fixing device 14 and the exposed portion 602 of the bearing plate 15.

[0087] Figure 6 is an explanatory diagram showing the anchoring structure 10 shown in Figure 1, but with an additional cap 60; therefore, explanations of matters explained using Figure 1 are omitted. Figure 6 schematically shows a cross-sectional view of the tensioning member 13 along the central axis CA1.

[0088] By covering the exposed portion 601 of the fixing device 14 and the exposed portion 602 of the bearing plate 15 with the cap 61, the exposed portion 601 of the fixing device 14 and the exposed portion 602 of the bearing plate 15 can be protected by the cap 61. In addition, rust prevention treatment can be omitted for the exposed portion 601 of the fixing device 14 and the exposed portion 602 of the bearing plate 15, thereby increasing productivity.

[0089] The exposed portion 601 of the fixing device 14 is the side surface 14A and the end surface 14B of the fixing device 14.

[0090] Figures 7 and 8 show side views of the cap 61.

[0091] As shown in Figure 7, the cap 61 may be formed from a single component, but as shown in Figure 8, the cap 61 may have at least a first cap 81 and a second cap 82 along the longitudinal side of the tensioning member 13. The first cap 81 can cover only the exposed portion 603 of the tensioning member 13, the end face 14B of the fixing device 14, and a portion of the side surface 14A (see Figure 6). The second cap 82 can cover a portion of the side surface 14A of the fixing device 14.

[0092] By forming the cap 61 from multiple components, such as a first cap 81 and a second cap 82, the cap 61 can be easily replaced even if a part of it is damaged. Furthermore, since the ends of the tensioning material 13 and the fixing device 14 may have complex shapes, forming the cap 61 from multiple components can increase the productivity of the cap 61.

[0093] Furthermore, conventionally, a cap was sometimes used to protect the end 13A of the tensioning member 13, covering both the end 13A of the tensioning member 13 and a portion of the fixing device 14. Therefore, by forming the cap 61 from multiple components, it is possible to combine it with conventionally used products to create the cap 61, thereby reducing costs.

[0094] Figure 8 shows an example in which the cap 61 is formed from two components, a first cap 81 and a second cap 82. However, the cap 61 may be formed from three or more components. However, if the cap 61 is divided into an excessive number of components, the workability when installing the cap 61 may decrease. Therefore, the cap 61 may be formed from three or fewer components.

[0095] The shape of the cap 61 is not particularly limited, and its shape can be selected so as to cover the exposed portion 603 of the tensioning member 13, the exposed portion 601 of the fixing device 14, and the exposed portion 602 of the bearing plate 15.

[0096] Therefore, the cap 61 can have a shape that conforms to the outer shape of the tensioning member 13, the anchoring device 14, and the bearing plate 15. For example, if an exposed portion 602, which is part of the protrusion 153 of the bearing plate 15, is exposed from the concrete structure 11, the cap 61 can have a flange 611 so that it can cover the exposed portion 602. The flange 611 can be arranged planarly on the part of the cap 61 that faces the bearing plate 15.

[0097] The inner wall 61A of the cap 61 may be in direct contact with the side surface 14A of the fixing device 14, but as shown in Figure 6, there may be a gap 62 between the inner wall 61A of the cap 61 and the side surface 14A of the fixing device 14. In other words, the cap 61 may be larger in size than the outer diameter of the fixing device 14.

[0098] By having a gap 62 between the inner wall 61A of the cap 61 and the side surface 14A of the fixing device 14, the workability when installing the cap 61 can be improved.

[0099] The space between the cap 61 and the fixing device 14 can also be filled with resin. Therefore, by having a gap 62 between the inner wall 61A of the cap 61 and the side surface 14A of the fixing device 14, the gap 62 can be easily filled with resin.

[0100] The material of the cap 61 is not particularly limited, and various synthetic resins such as polyolefin resin and polyvinyl chloride resin can be used. (Fixing fixture) As described above, a filler such as resin can be filled between the cap 61 and the fixing device 14, so the cap 61 may be fixed to the fixing device 14 by the filler.

[0101] From the viewpoint of firmly fixing the cap 61 to the fixing device 14 and preventing moisture or the like from entering between the cap 61 and the fixing device 14, the fixing structure 10 may further have a fixing device 63 for fixing the cap 61 to the fixing device 14.

[0102] By fixing the cap 61 to the fixing device 14 with the fastener 63, the cap 61 can be firmly secured to the fixing device 14, preventing the cap 61 from falling off or water or other substances from entering between the cap 61 and the fixing device 14.

[0103] The fastener 63 is not particularly limited and can have an annular shape and be formed to tighten the cap 61 and press against the fixing device 14. The material of the fastener 63 is not particularly limited and can be various synthetic resins such as polyolefin resin or polyvinyl chloride resin.

[0104] Although embodiments have been described in detail above, the invention is not limited to any particular embodiment, and various modifications and changes are possible within the scope described in the claims. [Explanation of Symbols]

[0105] 10 Fixing Structure 11. Concrete structures 11A Surface (Surface of concrete structure) 12 sheaths 13 Tensors 13A end 14 Fixing device 14A Side 14B End face 141 Oscone 142 Mescone 142A through hole 15. Bearing plate 151 Through hole D151 Inner diameter of through hole CA2 center axis 151A opening 152 recess D152 Inner diameter of recess 152A Bottom surface (surface supporting the fixing device) L152 Depth 153 Convex part 15A 1st end 15B 2nd end 20 Block Arrows 50 gaps 601 Exposed part of the fixing device 602 Exposed portion of the bearing plate 603 Exposed portion of tensioning material 61 Cap 61A Inner wall 611 Flange 62 gaps 63 Fixtures 81 First Cap 82 Second Cap

Claims

1. A bearing plate is placed between a fixing device installed at the end of a tensioning member and a concrete structure, The bearing plate has a first end facing the concrete structure, A second end is located opposite the first end and faces the fixing device, It has a through hole that penetrates between the first end and the second end and into which the tensioning member is inserted, The second end has a recess for fitting a part of the fixing device, The opening of the through hole at the second end is a bearing plate positioned within the recess.

2. The bearing plate according to claim 1, wherein the second end portion has a protrusion that surrounds the recess and protrudes more than the other portion.

3. The bearing plate according to claim 2, wherein when the second end is viewed along the central axis of the through hole, the convex portion is arranged in an annular manner along the outer circumference of the concave portion.

4. The bearing plate according to claim 2 or 3, wherein the convex portion is divided into a plurality of parts along the outer circumference of the concave portion.

5. An anchoring device installed at the end of a tensioning member that introduces tension into a concrete structure, The device comprises the aforementioned anchoring device and a bearing plate positioned between it and the concrete structure, The bearing plate has a first end facing the concrete structure, A second end is located opposite the first end and faces the fixing device, It has a through hole that penetrates between the first end and the second end and into which the tensioning member is inserted, The second end has a recess for fitting a part of the fixing device, The opening of the through hole at the second end is located within the recess. A part of the aforementioned fixing device is a fixing structure fitted into the recess.

6. The bearing plate is entirely placed within the concrete structure. The anchoring structure according to claim 5, wherein, in a cross-section along the central axis of the tensioning member, the position of the surface supporting the anchoring device in the recess and the position of the surface of the concrete structure on which the bearing plate is placed are different along the longitudinal direction of the tensioning member.

7. The fixing structure according to claim 5 or claim 6, further comprising a cap that covers the exposed portion of the fixing device and the exposed portion of the bearing plate.

8. The cap has at least a first cap and a second cap along the longitudinal direction of the tensioning member. The fixing structure according to claim 7, wherein the first cap covers only the exposed portion of the tensioning material and a portion of the end face and side surface of the fixing device.

9. The fixing structure according to claim 7, wherein there is a gap between the inner wall of the cap and the side surface of the fixing device.

10. The fixing structure according to claim 7, further comprising a fixing device for fixing the cap to the fixing device.

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