Method for manufacturing a fastening structure

Abstract

Provided is a method for manufacturing a fastening structure that can be easily released from fastening by a rotating body such as a bolt or nut for fastening a structure. 【Solution means】The manufacturing method of the present disclosure includes step S10 and step S6. Step S10 is a molding step of molding a curable material 80 that cures when a predetermined condition is satisfied, using a molding tool 100 into a predetermined shape including a portion that supports a release jig for releasing the fastening by the rotating body 1, which is a nut into which a bolt for fastening a structure is inserted, so that the side surface of the rotating body 1 is buried. Step S6 is a curing step of curing the curable material 80 molded in step S10 (molding step). Step S10 Then, a curable material 80 is disposed on at least a part of the periphery of the rotating body 1, and by pressing the curable material 80 disposed around the rotating body 1 against a forming jig 100, the curable material 80 enclosing the rotating body 1 is formed into the predetermined shape.

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a fastening structure. According to the method

Background Art

[0002] For the protection of bolts and nuts for fastening structures, predetermined processing may be performed on the bolts and nuts. As a bolt protection technique, Patent Document 1 describes "a rust-proof bolt head cap having a closed upper end and an opening at the lower end, which is covered on the bolt head, and a skirt portion covered on a washer located under the bolt head is continuously provided under a main body portion covered on the bolt head. The main body portion and the skirt portion are formed of a flexible material, and a lower end contact portion that contacts the surface of the bolt fastening portion is formed at the lower end of the skirt portion. At least one of the inner peripheral surfaces of the main body portion and the skirt portion forms an annular shape continuously in the circumferential direction, and ribs that are deformed by pressing against the outer peripheral surface of the bolt head or the washer are formed, and a plurality of the ribs are arranged at intervals in the vertical direction."

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the structure described in Patent Document 1, a cap is arranged to cover the bolt head. The cap is made of a flexible material. Therefore, even if an attempt is made to rotate the cap using a release tool (such as a wrench) for releasing the fastening of the bolt, the force applied by the release tool escapes, and the bolt inside the cap cannot be rotated. ​The problem to be solved by the present disclosure is a method for manufacturing a fastening structure that can easily release the fastening by a rotating body such as a bolt or a nut for fastening a structure. According to the method Provided.

Means for Solving the Problem

[0005] The manufacturing method of the fastening structure of the present disclosure includes a molding step of molding a curable material that cures when a predetermined condition is satisfied, across at least a part of the side surface of a rotating body that can fasten a structure by rotation in one direction and can release the fastening of the structure by rotation in the other direction, and the surface of the structure facing the rotating body, using a molding tool into a predetermined shape including a portion that supports a release tool for releasing the fastening by the rotating body, and a curing step of curing the curable material molded in the molding step. In the molding step, the curable material is disposed at least in part around the rotating body, and by pressing the curable material disposed around the rotating body against the molding jig, the curable material enclosing the rotating body is molded into the predetermined shape.

Advantages of the Invention

[0006] According to the present disclosure, a method for manufacturing a fastening structure that can easily release the fastening by a rotating body such as a bolt or a nut for fastening a structure can be provided. According to the method Provided.

Brief Description of the Drawings

[0007]

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Embodiments for Carrying Out the Invention

[0008] Hereinafter, a mode for carrying out the present disclosure (referred to as an embodiment) will be described with reference to the drawings. In the description of the following one embodiment, descriptions of other embodiments applicable to the one embodiment will be made as appropriate. The present disclosure is not limited to the following one embodiment, and different embodiments can be combined with each other or arbitrarily modified within a range not significantly impairing the effects of the present disclosure. Also, the same members will be denoted by the same reference numerals, and redundant descriptions will be omitted. Further, those having the same function will be given the same name. The illustrated content is merely schematic, and for the convenience of illustration, it may be changed from the actual configuration within a range not significantly impairing the effects of the present disclosure, or the illustration of some members may be omitted or modified between the drawings. Also, in the same embodiment, it is not always necessary to include all the configurations.

[0009] FIG. 1 is a flowchart for explaining a manufacturing method of a fastening structure 10 of the present disclosure (hereinafter, abbreviated as the manufacturing method of the present disclosure as appropriate). The manufacturing method of the present disclosure is a method for manufacturing a fastening structure 10 that can easily execute the release of the fastening of the structure 50 by the rotating body 1. The manufacturing method of the present disclosure is also a method for constructing the fastening structure 10 for the structure 50 (FIG. 2), a method for protecting the rotating body 1, a method for arranging the hard members, and the like.

[0010] In this specification, the rotating body 1 is a nut into which the bolt 2 is inserted. However, the rotating body 1 is not limited to a nut, and may be a bolt 2 or a stud bolt (not shown). In the case of a stud bolt, nuts are inserted into both ends of the stud bolt, for example. The rotating body 1 of the present disclosure may be only one of the nuts arranged at both ends, or both nuts. Also, the structure 50 is, for example, a structure such as a flange, but is not limited thereto, and may be, for example, a structure with an internal thread cut.

[0011] FIG. 2 is a side view of the fastening structure 10 of the present disclosure. FIG. 3 is a perspective view of the fastening structure 10 of the present disclosure. The fastening structure 10 is installed on a structure 50 and includes a rotating body 1, a bolt 2, and a rigid member 3 that encloses the rotating body 1 and the bolt 2. The rotating body 1 is a structure that can fasten the structure 50 by rotating in one direction (for example, counterclockwise) and can release the fastening of the structure 50 by rotating in the other direction (for example, clockwise). The rigid member 3 preferably completely covers the entire rotating body 1 and the bolt 2, but it is not necessarily required to completely cover the entire rotating body 1 and the bolt 2. It is sufficient to enclose the rotating body 1 to the extent that at least the side surface 11 of the rotating body 1 is covered (for example, at least a part of the side surface 11 is buried in the height direction). By rotating the rotating body 1 in a predetermined direction, the fastening can be released. However, it is preferable to cover the entire side surface 11. Thereby, when the curable material 80 and the bolt 2 are slightly peeled off, it is possible to suppress water from entering these gaps and the progress of crevice corrosion.

[0012] Details will be described later, but the rigid member 3 is formed into a predetermined shape such as a regular hexagonal prism. Therefore, by covering the rigid member 3 with a socket 60 having an inner surface of the predetermined shape and rotating the socket 60 using a release jig 70 (described later) such as a power tool, the rotating body 1 enclosed in the rigid member 3 can be rotated. That is, the rotating body 1 rotates together with the rigid member 3 in a plane parallel to the extending direction of the structure 50. Thereby, the fastening to the structure 50 can be released.

[0013] Note that when releasing the fastening, it may be arranged on the side opposite to the arrangement side of the release jig 70 (such as a power tool) that supports the rigid member 3, and a pressing jig (not shown) such as a wrench may be engaged with a member (not shown) that supports the rotation of the rotating body 1. Thereby, the entire fastening structure 10 can be suppressed from rotating (rotating around), and it can be easily released. Regarding the "member that supports the rotation" mentioned here, for example, when the rotating body 1 is a nut, the member is, for example, the head of a bolt arranged on the side opposite to the nut via the structure 50 (such as a flange).

[0014] Returning to FIG. 1, the manufacturing method of the present disclosure includes steps S1 to S6. Among these, steps S1 to S4 constitute step S10. Therefore, the manufacturing method of the present disclosure also includes step S10. Step S10 is a molding step of molding the curable material 80 into a predetermined shape using the molding jig 100 across at least a part of the side surface 11 of the rotating body 1 and the surface of the structure 50 facing the rotating body 1. In the example of the present disclosure, the curable material 80 is disposed across the side surface 11 and the surface that exists in the vicinity of the rotating body 1 and exists on the outer periphery of the rotating body 1 among the surfaces of the structure 50. The curable material 80 is molded so as to cover the side surface 11 and the structure 50. The predetermined shape is a shape including a portion that supports the release jig 70. By curing the curable material 80, the above-mentioned hard member 3 is formed. The release jig 70 is a jig (tool) for releasing the fastening by the rotating body 1, and is, for example, at least one of a pipe wrench, a spanner, a power tool, a socket 60 rotatable by a power tool, and the like.

[0015] The curable material 80 is a material that cures when a predetermined condition is satisfied. Therefore, the curable material 80 has plasticity when being filled into the molding jig 100 (when being disposed. When the rotating body 1 is enclosed), but loses plasticity when a predetermined condition is satisfied and changes into the hard member 3. The specific hardness of the hard member 3 is not particularly limited, but it is preferably a hardness such that the hard member 3 does not deform when rotated by the release jig 70. Specific examples of the curable material 80 include, for example, one-component or two-component mixed epoxy putty, a resin that cures by light irradiation such as ultraviolet rays, a material that cures over time (concrete, gypsum, etc.), a green sheet that cures by sintering, and the like.

[0016] In step S1, a curable material 80 is disposed on at least a part of the periphery of the rotating body 1. The disposition can be carried out, for example, by winding (disposing) a flat curable material 80 around the entire circumference of the rotating body 1. In this case, the curable material 80 is disposed on the entire periphery of the rotating body 1, but only a part may also be sufficient. Further, the disposition can also be carried out by disposing a flat curable material 80, for example, on each of one end side and the other end side in the radial direction of the rotating body 1 between the fixing portion 101 described later and the rotating body 1. In this case, the curable material 80 is disposed on a part of the periphery of the rotating body 1. Furthermore, when the curable material 80 is disposed between the fixing portion 101 and the rotating body 1, it can be disposed in any form such that it contacts the fixing portion 101 but does not contact the rotating body 1, or it does not contact the fixing portion 101 but contacts the rotating body 1, or it does not contact both the fixing portion 101 and the rotating body 1.

[0017] Step S2 is a step of disposing the molding jig 100 at a predetermined position with respect to the rotating body 1. In other words, step S2 is a step of disposing the molding jig 100 such that the rotating body 1 fits between the housings 110 and 111. First, the structure of the molding jig 100 will be described, and then the curable material 80 will be described.

[0018] FIG. 4 is an upper perspective view of the molding jig 100 and is a schematic view of a state in which the fixing portion 102 (first fixing portion) and the fixing portion 103 (second fixing portion) are released from contact. FIG. 5 is a lower perspective view of the molding jig 100 in the state of FIG. 4. FIG. 6 is an upper perspective view of the molding jig 100 in the state of FIG. 4 viewed from a direction different from that of FIG. 4.

[0019] The molding jig 100 is a molding jig that can be used in the manufacturing method of the present disclosure. The molding jig 100 is used when molding the curable material 80 that encloses the rotating body 1. The molding jig 100 is a molding jig that can mold the curable material 80 such that the central axis of the curable material 80 after molding substantially coincides (may be completely coincident) with the central axis of the rotating body 1, and even at the portion where the thickness of the curable material 80 is minimum, it preferably has the minimum necessary thickness for rotating the rotating body 1. The molding jig 100 includes a fixing portion 101 and a wall portion 104. Further, the molding jig 100 includes a housing 110, a housing 111, and a housing 112.

[0020] The housing 110 and the housing 112 are fixedly arranged so as not to be relatively movable via a pair of shafts 113. On the other hand, the housing 111 disposed between the housing 110 and the housing 112 is inserted through the shaft 113 and is movable along the shaft 113 between the housing 110 and the housing 112. A drive unit 108 fixed to the housing 112 is connected to the housing 111.

[0021] The housing 110 is provided with a fixing portion 102 of the fixing portion 101, a wall portion 104, a roof 105, and a handle 106. The housing 111 is provided with a fixing portion 103 of the fixing portion 101 and a wall portion 104. The housing 112 is provided with a drive unit 108. All of these are provided in the forming jig 100 as described above.

[0022] The housing 110 has a semi-circular shape with a recessed radial portion, and the wall portion 104 and the fixing portion 101 are provided on the inner wall of the recessed portion. The fixing portion 101 stands upright from the wall portion 104.

[0023] The fixing portion 101 is a structure (protrusion, convex portion) that supports at least one of the side surfaces of a part in the height direction on the side surface 11 of the rotating body 1 or the side surface 21 of a bolt 2 which is an example of a member having a shaft L2 that protrudes above the rotating body 1 and coincides with the rotation axis L1 of the rotating body 1. In the example of the present disclosure, the fixing portion 101 aligns by sandwiching (contacting) the rotating body 1 between the fixing portion 102 and the fixing portion 103. By alignment, the rotation axis L1 and the central axis L3 coincide. However, the fixing portion 101 may be a structure that supports a portion (a part of the bolt 2. Side surface 21) that protrudes above the rotating body 1 among the bolts 2 having the shaft L2 as described above. With the fixing portion 101, the rotating body 1 can be arranged at the center of the plurality of fixing portions 101, and alignment can be performed. Further, the rotation axis L1 of the rotating body 1 and the central axis L3 of the curable material 80 can be made to coincide, and the rotation at the time of release of fastening can be stabilized.

[0024] The fixing part 101 includes a fixing part 102 (first fixing part) and a fixing part 103 (second fixing part) that is drivable (movable) with respect to the fixing part 102 and is arranged opposite to the fixing part 102.

[0025] The fixing part 101 has a shape corresponding to the rotating body 1 and supports the side surface 11 of the rotating body 1 by contacting the side surface 11 of the rotating body 1. At this time, the molding jig 100 is fixed to the rotating body 1. In one embodiment, the rotating body 1 is a nut having a regular hexagonal prism shape as described above.

[0026] The fixing part 101 is partially provided in the circumferential direction of the wall part 104 (the circumferential direction of the rotating body 1). By doing so, since the curable material 80 can be filled in the portion where the fixing part 101 is not provided, the amount of the curable material 80 to be filled can be increased, and the strength of the hard member 3 can be improved. In the example of the present disclosure, the fixing part 101 includes four fixing parts 102 and 103 having a side surface shape bent at an angle of 120° so that four of the six upper corners of the regular hexagonal prism can be fixed (supported, contacted). Among these, two fixing parts 102 are provided in the housing 110. The remaining two fixing parts 103 (second fixing parts) are provided in the housing 111. The fixing part 103 is a structure that is provided in the housing 111, is drivable with respect to the fixing part 102, and is arranged opposite to the fixing part 102. Note that the fixing part 101 may be provided over the entire circumferential direction of the rotating body 1.

[0027] The wall part 104 is arranged in the remaining part in the height direction of the rotating body 1 (the remaining part other than the installation location of the fixing part 101), and is a structure that is separated from the side surface 11 of the rotating body 1 when the rotating body 1 is fixed by the fixing part 101. Therefore, the wall part 104 is arranged so as to surround the rotating body 1 on the side of the rotating body 1.

[0028] The wall portion 104 has a shape similar to the shape of the entire side surface 11 of the rotating body 1. In the illustrated example, it is a regular hexagonal prism shape larger than the dimensions of the rotating body 1. Specifically, the wall portion 104 provided in the housing 110 and the wall portion 104 provided in the housing 111 form a wall portion 104 in a regular hexagon shape when viewed from above. Therefore, a semi-regular hexagon formed by cutting through two opposite corners out of six corners is formed by the wall portion 104 provided in the housing 110, and the remaining semi-regular hexagon is formed by the wall portion 104 provided in the housing 111.

[0029] However, the shape of the wall portion 104 (i.e., the rigid member 3) does not necessarily have to be a shape similar to the shape of the side surface 11 of the rotating body 1. For example, when the shape of the side surface 11 of the entire rotating body 1 is not a general-purpose shape, a non-similar shape is preferable. That is, for example, by molding the curable material 80 into a shape (e.g., the side surface shape of a regular hexagonal prism) that can fit a general-purpose socket 60, the rotating body 1 can be easily rotated using a power tool.

[0030] The installation height of the fixing portion 101 in the wall portion 104 is, for example, the upper half in the height direction of the wall portion 104, but it is not limited to this. Although details will be described later, after the rotating body 1 is supported by the fixing portion 101, the curable material 80 is filled (arranged) in the space 121 between the side surface 11 of the rotating body 1 and the wall portion 104.

[0031] Also, the protruding height of the fixing portion 101 from the wall portion 104 is the same for any of the fixing portions 101. Therefore, all the fixing portions 101 have the same shape. For this reason, when the fixing portion 102 (first fixing portion) and the fixing portion 103 (second fixing portion) support the side surface 11 of the rotating body 1, the distance between the wall portion 104 and the side surface 11 of the rotating body 1 is the same throughout the entire circumferential direction of the rotating body 1. By doing so, the thickness of the rigid member 3 generated by the curing of the curable material 80 can be made the same throughout the entire circumferential direction. As a result, when rotating the rotating body 1 from the outside with the release jig 70, force can be easily transmitted evenly to the entire rotating body 1, making it easier to rotate the rotating body 1.

[0032] However, the distance between the wall portion 104 and the side surface 11 of the rotating body 1 (the thickness of the curable material 80) does not have to be the same throughout the circumferential direction of the rotating body 1. That is, although details will be described later, when rotating, if the rigid member 3 has a rigidity that allows the rigid member 3 to rotate, it does not have to be the same distance.

[0033] The surfaces of the wall portion 104 and the fixing portion 101 (the portion of the molding jig 100 that contacts the curable material 80) are subjected to a mold release property improvement process for the curable material 80. The curable material 80 is a material that cures when the above-mentioned predetermined conditions are satisfied. By performing the mold release property improvement process, when removing the molding jig 100 after filling and molding the curable material 80, the molding jig 100 can be easily removed.

[0034] Specific examples of the mold release property improvement process include, for example, providing a texture on the surface, forming the surface with a material having low affinity with the curable material 80, etc. Materials having low affinity with the curable material 80 are, for example, polytetrafluoroethylene, polyethylene, wax, fats and oils, etc. Further, specific examples of the mold release property improvement process also include forming the surface with a water-containing material such as polyvinyl chloride, applying a filler to the surface, etc. Also, a film (for example, a disposable film) etc. may be attached to the wall portion 104, and by removing the curable material 80 from the molding jig 100 and further peeling off the film after curing, adhesion to the molding jig 100 can be suppressed.

[0035] The roof 105 is provided in the molding jig 100 and is a structure that covers the contact portion 120 (described later) between the housing 110 (the first housing) and the housing 111. By providing the roof 105, it is possible to suppress the curable material 80 from protruding to the outside so as to cross over the contact portion 120. In the example of the present disclosure, since there are two contact portions 120, the roof 105 is provided at two locations.

[0036] The housing 110 is provided with a handle 106 on the side opposite to the arrangement side of the structure 50 as viewed from the housing 110. Thereby, while the constructor holds the handle 106, the driving unit 108 can be operated to bring the housing 111 closer to the housing 110. Also, it is possible to prevent the housing 110 from shifting from the central position of the rotating body 1 when the driving unit 108 is being operated. Furthermore, after the curable material 80 is molded by the molding jig 100, the molding jig 100 is opened, the adhesion between the curable material 80 and the molding jig 100 is broken, and then it can be easily lifted. In addition, since the installation side of the handle 106 is upward as viewed from the structure 50, it is easy to distinguish between the upper surface (the side surface where the handle 106 is installed) and the lower surface of the molding jig 100.

[0037] The driving unit 108 is a driving mechanism that makes the housing 110 having the fixing portion 102 and the housing 111 having the fixing portion 103 arranged to face the fixing portion 102 abut or separate from each other. The driving unit 108 is provided in the molding jig 100 and is, for example, a screw mechanism. By the constructor rotationally driving the driving unit 108, the relative position of the housing 111 with respect to the housing 110 can be changed, and the housing 111 can be abutted against the housing 110. Note that the space 121 formed between the housing 110 and the housing 111 is filled with the curable material 80.

[0038] The driving unit 108 has a structure capable of electrically driving the housing 111 (the second housing). The housing 111 is, for example, drivable with respect to the housing 110 by the driving unit 108. By having a structure capable of being electrically driven, the housing 111 can be moved with a large torque in a state where the curable material 80 is filled in the molding jig 100, and the curable material 80 can be molded.

[0039] Details will be described later with reference to FIG. 12 and the like. When the rotating body 1 is supported by the fixing portion 101, the fixing portion 102 first supports the rotating body 1 among the fixing portion 101 or the fixing portion 102. And, among the side surfaces 1101 of the housing 110 (first housing), the side surface 1103 on the side opposite to the side surface 1102 on the installation side of the housing 111 (second housing) includes a curved surface. By doing so, the housing 110 to be installed first can be formed into a rounded shape, and the degree of freedom of installation can be increased compared to the case including corners. For example, in the case of the structure 50 in which a plurality of rotating bodies 1 are arranged adjacent to each other, or in the case of the structure 50 in which the rotating body 1 is arranged in a deep place, by appropriately rotating the housing 110, it is easy to insert the rotating body 1 between the fixing portion 102 and the fixing portion 103.

[0040] FIG. 7 is an upper perspective view of the molding jig 100 and is a schematic view of a state in which the housing 110 and the housing 111 are in contact with each other. FIG. 8 is a lower perspective view of the molding jig 100 and is a schematic view of a state in which the housing 110 and the housing 111 are in contact with each other.

[0041] The housing 110 includes a corner 107 at a portion facing the housing 111. The corner 107 is disposed below the roof 105. The corner 107 is provided at a portion corresponding to the corner of a regular hexagon. Further, the housing 111 includes a convex portion 114 that gradually narrows toward the tip at a portion facing the housing 110 (particularly the corner 107). The convex portion 114 abuts against the corner 107. The contact portion 120 between the corner 107 and the convex portion 114 is disposed below the roof 105. For this reason, the constructor cannot visually recognize the contact portion 120 from above. Also, a space 121 (however, open at the top and bottom) is formed between the housing 110 and the housing 111 with the periphery closed. The rotating body 1 and the curable material 80 are disposed in the space 121.

[0042] FIG. 9 is a perspective view from above of the molding jig 100, and is a schematic view showing a state in which the molding jig 100 is fixed to the rotating body 1. FIG. 10 is a perspective view from below of the molding jig 100, and is a schematic view showing a state in which the molding jig 100 is fixed to the rotating body 1. FIG. 11 is a cross-sectional view of the molding jig 100, and is a schematic view showing a state in which the molding jig 100 is fixed to the rotating body 1. In FIGS. 9 to 11, for simplicity of illustration, the curable material 80 is not shown. Further, in FIG. 11, for convenience of illustration, part of the structure of the molding jig 100 is omitted and deformed.

[0043] The molding jig 100 is fixed by bringing the fixing portion 101 of the molding jig 100 into contact with four of the six corners of the regular hexagonal prism of the rotating body 1. And when the molding jig 100 is fixed, the positioning and molding operations are completed simultaneously. The fixing is performed at approximately the upper half (the fixing portion is approximately 50% in the height direction) of the side surface 11 of the rotating body 1. A space 121 is formed between the side surface 11 of the rotating body 1 and the wall portion 104. The curable material 80 is disposed in the space 121 through an opening formed above the molding jig 100. In other words, the curable material 80 is in the space 121 at this time. However, the curable material 80 may be disposed first and the molding jig 100 may be installed from above.

[0044] FIG. 12 is a process diagram showing the manufacturing method of the present disclosure using the molding jig 100, and is a schematic view showing a state in which the molding jig 100 is disposed so as to sandwich the rotating body 1 with the curable material 80 disposed around it. In FIGS. 12 to 14, for simplicity of illustration, the molding jig 100 is shown in a simplified manner.

[0045] As described above, in step S1, the curable material 80 is disposed in contact with the rotating body 1 (which may be the molding jig 100). In the example of FIG. 12, the curable material 80 is disposed over the entire circumferential direction of the rotating body 1. When the curable material 80 is disposed, it is preferable that the drive unit 108 is controlled so that the housing 111 is at the position farthest from the housing 110.

[0046] The thickness of the curable material 80 to be configured is preferably the same throughout the circumferential direction of the rotating body 1. However, it is not necessary to be exactly the same thickness. For example, when the curable material 80 is arranged (wrapped) around the rotating body 1, it may be the same thickness with an accuracy that seems the same to the constructor's eye. The curable material 80 may be, for example, a curable material 80 having no shape, which is scooped along the wall portion 104 using, for example, a painted work glove, a spatula, etc., or a curable material 80 formed into a sheet shape having a predetermined thickness may be arranged along each wall portion 104.

[0047] Also, in step S10 (specifically steps S1, S2), the curable material 80 is preferably arranged across the rotating body 1 and the structure 50 so as to cover at least a part of the side surface 11 of the rotating body 1 and the structure 50. That is, the curable material 80 is preferably arranged so as to reach the structure 50 arranged below the molding jig 100, that is, so as to cover from the upper end to the base of the rotating body 1. Thereby, it is possible to suppress the intrusion of foreign matters such as air and water into the gap formed between the rotating body 1 and the surface of the structure 50, and it is possible to suppress deterioration such as rust and crevice corrosion.

[0048] In the example of the present disclosure, the curable material 80 is arranged to contact the rotating body 1, but it may be arranged to contact the molding jig 100 (for example, the fixing portion 101) instead of the rotating body 1. In this case, for example, two flat curable materials 80 are arranged on the respective opposing fixing portions 102, 103, and the rotating body 1 is arranged between them, so that the curable material 80 can be molded around the rotating body 1.

[0049] Returning to FIG. 1, step S3 is a step of pressing the molding jig 100 against the curable material 80. Step S4 is a step of operating the drive unit 108 to tighten the molding jig 100 (bringing the housing 111 closer to the housing 110). By step S4, at least the side surface 11 of the curable material 80 is buried in the curable material 80, and the curable material 80 is formed into the predetermined shape on the side of the rotating body 1. In steps S3 and S4, by pressing the curable material 80 disposed around the rotating body 1 against the molding jig 100, the curable material 80 enclosing the rotating body 1 is formed into a predetermined shape.

[0050] FIG. 13 is a process diagram showing the manufacturing method of the present disclosure using the molding jig 100, and is a schematic diagram showing a state in which the molding jig 100 is pressed against the curable material 80. The pressing can be performed, for example, by an operator pulling the entire molding jig 100 in a direction in which the housing 111 moves away from the rotating body 1. By the pressing, the curable material 80 between the housing 110 and the rotating body 1 overflows to the outside of the housing 110, for example, from the side of the housing 110.

[0051] FIG. 14 is a process diagram showing the manufacturing method of the present disclosure using the molding jig 100, and is a schematic diagram showing a state in which the curable material 80 is formed by the molding jig 100. By an operator operating the drive unit 108, the housing 111 moves toward the rotating body 1. Then, the housing 111 abuts against the housing 110, and the abutting portion 120 is formed. By the generation of the abutting portion 120, the curable material 80 is densely formed in the space 121 between the housing 110 and the housing 111. At the same time, the side surface 81 of the curable material 80 is formed into the shape of the wall portions 104 of the housings 110 and 111. Also, as described above, the distance between the side surface 11 of the rotating body 1 and the wall portion 104 is equal throughout the circumferential direction of the rotating body 1. Therefore, the thickness of the curable material 80 is also equal throughout the circumferential direction of the rotating body 1. Further, the positioning of the rotating body 1 with respect to the entire curable material 80 is also performed.

[0052] The excess curable material 80 leaks as excess material 82 into the space 122 adjacent to the space 121. The leaked curable material 80 is appropriately removed.

[0053] Like steps S1 to S4, in step S10 (the molding step), a curable material 80 having a predetermined thickness, for example, is disposed between the molding jig 100 and the rotating body 1. Then, by pressing the molding jig 100 against the curable material 80 disposed around the rotating body 1, the curable material 80 enclosing the rotating body 1 is molded into the predetermined shape. By doing so, it becomes easy to make the thickness of the curable material 80 formed around the rotating body 1 uniform.

[0054] Note that the molding jig 100 is not limited to the method of sandwiching the rotating body 1 as in the example of the present disclosure. For example, it may be a jig of a method (snowball manufacturing machine method) of putting the curable material 80 and the rotating body 1 into one mold and molding them like a snowball. Further, the molding jig 100 may be, for example, a jig (a general mold method jig) that can be molded by disposing the molding jig so as to surround the rotating body 1, then filling the inside with the curable material 80, and then removing the molding jig. Furthermore, the molding jig 100 may be a jig (a die-cutting method jig) that can be molded by covering the curable material 80 enclosing the rotating body 1 with a molding jig having a closed top surface and removing the protruding portion.

[0055] Returning to FIG. 1, in step S5, the molding jig 100 is removed from the curable material 80 by the constructor. The removal can be performed, for example, by the constructor pulling up the handle 106 upward. At the time of removal, the curable material 80 may be cured or uncured. That is, the curable material 80 may be cured inside the molding jig 100, or may be cured in the removed state. In the present disclosure, after the end of step S10 and before being completely cured (it may be somewhat cured), the molding jig 100 is removed.

[0056] FIG. 15 is a perspective view of the curable material 80 molded using the molding jig 100. In step S10 (the molding step), the curable material 80 is molded into a shape having side surfaces 81 which are a pair of opposing planes. By doing so, the rotating body 1 can be rotated using a release jig 70 that sandwiches the side surfaces 81 which are a pair of opposing planes. Also, generally available tools (general-purpose tools) can be used.

[0057] As described above, the shape of the wall portion 104 in the molding jig 100 becomes the shape of the side surface 81 (side surface 31 of the hard member 3) of the curable material 80. Therefore, by making the shape of the wall portion 104 into a desired shape such as a regular hexagon, a cylindrical shape (described later), etc., the side surface 11 shape of the curable material 80 and the hard member 3 can be made into a desired shape such as a regular hexagonal prism, a cylinder, etc. Note that the desired shape is not limited to these examples, and may be a rectangular prism such as a quadrangular prism, an elliptical cylinder, a star shape, etc. Further, in order to facilitate hooking the release jig 70, the surface of the hard member 3 may be appropriately provided with grooves, ribs, unevenness, etc.

[0058] In step S10 (molding process), the side surface 81 of the molded curable material 80 and the side surface 11 of the rotating body 1 are parallel. By doing so, the usage amount of the curable material 80 can be minimized, and the cost of the curable material 80 can be reduced. However, the side surface 81 and the side surface 11 do not have to be parallel.

[0059] Also, the thickness of the curable material 80 arranged along the side surface 81 is preferably such that the hard member 3 generated by the curing of the curable material 80 has a rigidity sufficient to withstand the rotation by the release jig 70. Among them, depending on the type of the hard member 3, there is also a hard member in which moisture can penetrate from the surface of the hard member 3 into the hard member 3 when the structure 50 including the rotating body 1 is used. For this reason, even when moisture penetrates into the hard member 3 during the use of the structure 50, it is also preferable to have a thickness such that the penetrated moisture does not reach the rotating body 1.

[0060] Furthermore, in step S10, at least the portion of the side surface 81 of the curable material 80 that supports the release jig 70 is formed to be parallel to the rotation axis L1 of the rotating body 1. In the illustrated example, the release jig 70 (specifically, the socket 60) supports the entire side surface 81. By doing so, when the rotating body 1 is rotated about the rotation axis L1, the release jig 70 can be hooked on the side surface 81 parallel to the rotation axis L1, and the rotating body 1 can be easily rotated. Among them, it is preferable that the rotation axis L1 of the rotating body 1 and the central axis L3 (central axis and rotation axis of the hard member 3) of the curable material 80 coincide or substantially coincide.

[0061] When the release jig 70 is hooked on the side surface 31 of the hard member 3 to rotate the rotating body 1, the rotation axis L1 is a straight line passing through the portion that becomes the rotation center of the rotating body 1 and extending in a direction perpendicular to the structure 50. If the hard member 3 is a cylinder, the rotation axis L1 is a straight line passing through the center of the circle; if the hard member 3 is a regular hexagonal prism, the rotation axis L1 is a straight line passing through the center of the regular hexagon.

[0062] Also, when the molding jig 100 is removed, the side surface 81 of the curable material 80 generally has a shape (for example, a similar shape) corresponding to the shape of the side surface 11 of the rotating body 1. However, the curable material 80 does not exist at the site where the fixing portion 101 was present. For this reason, the shape of the curable material 80 is a shape having a portion 83 in which four upper corners are cut out in the shape of the fixing portion 101, as shown in FIG. 15, among the regular hexagonal prisms corresponding to the regular hexagonal prism-shaped rotating body 1. However, when the fixing portion 101 fixes (supports) the bolt 2 or the like, there may be a case where the cut-out portion 83 does not exist in the height portion of the rotating body 1.

[0063] Therefore, after removing the molding jig 100, preferably before the curable material 80 is completely cured, it is preferable to fill (embed) the curable material 80 in the cut-out portion 83. Thereby, the thickness of the curable material 80 can be made uniform also in the height direction around the rotating body 1. However, when the height of the fixing portion 101 is small (for example, 50% or less, preferably 20% or less in terms of the height ratio) with respect to the height of the rotating body 1, it may not be necessary to fill the curable material 80.

[0064] Also, when filling the cut-out portion 83, it is preferable to further fill the curable material 80 in the height direction so as to embed (enclose) the bolt 2 protruding above the rotating body 1. By further filling the curable material 80 so as to embed the bolt 2, the structure shown in FIG. 2 etc. (a structure in which the rotating body 1 and the bolt 2 are completely covered with a hard member) can be obtained. When further filling the curable material 80 in the height direction, it is preferable to fill it so as to have the same shape as the shape of the side surface 81 of the curable material 80 that has already been formed.

[0065] Returning to FIG. 1, step S6 is a curing step of curing the curable material 80 formed in step S10. By step S6, a fastening structure 10 (FIG. 2) in which at least the side surface 11 of the rotating body 1 is covered with a hard material is obtained. The specific method of curing is not particularly limited and may be appropriately determined according to the type of the curable material 80.

[0066] The fastening structure 10 can be applied to any use. For example, as the structure 50 provided with the fastening structure 10, there are a pump (for example, a joint portion (flange, etc.) between pipes), a bridge (a joint portion by high-strength bolts, etc.), a ship (a joint portion between hull parts, a structure assembling portion to the hull, etc.), a plant facility such as a factory and a power plant (a joint portion of a building and equipment in general), an offshore structure (a wind turbine, a gas plant, etc.), a dam (a joint portion of parts of a gate facility, etc.), a tunnel (a structure assembling portion for an anchor bolt, an exposed portion of a nut, etc.).

[0067] Also, the fastening structure 10 may be used in any environment. Among them, for example, it is suitable for use in an environment where the metal rotating body 1 may rust. This is because in the fastening structure 10, corrosion (rust, etc.) of the rotating body 1 is suppressed. Further, corrosion includes, for example, crevice corrosion occurring between a bolt and a nut, between the rotating body 1 and the structure 50, etc. For this reason, the fastening structure 10 may be installed in an environment where water (salt water) containing salt such as seawater and brackish water directly contacts the fastening structure 10, or in an environment exposed to an atmosphere containing vapor of salt water. Also, not limited to salt water, for example, in addition to a natural environment such as acid rain, an artificial environment such as a corrosive gas such as hydrogen sulfide in a plant facility, an environment where an antifreeze agent is sprayed on a road, etc., it may be installed in an environment exposed to a component (gas, liquid or solid) that causes corrosion.

[0068] FIG. 16 is a perspective view of a formed curable material 80 according to another embodiment. In the example shown in FIG. 16, the curable material 80 is formed hollow. Also, a bolt 2 that supports the rotation of a rotating body 1 that is a nut projects above the rotating body 1. Further, the bolt 2 does not rotate even when the rotating body 1 rotates. And the curable material 80 contacts the side surface 11 of the rotating body 1 but does not contact the bolt 2. That is, a space 85 is formed between the inner surface 84 of the curable material 80 and the bolt 2. The space 85 is not limited to being hollow and may be filled with a member other than the curable material 80 or the like. For this reason, the curable material 80 is formed so as to cover the rotating body 1 and the bolt 2 in a state of not contacting the bolt 2 and contacting the side surface 11 of the rotating body 1. The curable material 80 is formed, for example, as a regular hexagonal prism, a cylindrical shape, etc. on the side of the rotating body 1 and the bolt 2, and has, for example, a hemispherical shape approximately above the bolt 2.

[0069] As described above, by supporting the side of the hard member 3 with the release jig 70 and rotating the rotating body 1 from the outside of the hard member 3, the fastening structure 10 is released. Therefore, the hard member 3 also rotates as the rotating body 1 rotates. This is because the hard member 3 and the rotating body 1 are in contact (preferably in close contact) with each other with a strength such that the force of the release jig 70 can be applied to the rotating body 1. Therefore, by forming the bolt 2 that does not rotate when the rotating body 1 rotates so as not to contact the curable material 80, the hard member 3 does not contact the bolt 2. As a result, when the hard member 3 is rotated, a force for peeling the hard member 3 from the bolt 2 (rotating against the contact force at the contact surface) is not required when the hard member 3 contacts the bolt 2, and the rotating body 1 can be rotated with a light force.

[0070] In addition, since both the rotating body 1 and the bolt 2 can be entirely covered with the curable material 80, the gap formed between the rotating body 1 and the bolt 2 can also be covered with the curable material 80. Thereby, the intrusion of fluid (liquid, gas) into the gap can be suppressed, and crevice corrosion can be suppressed. Also, as described above, since the curable material 80 is disposed so as to cover the rotating body 1 and the structure 50, the gap formed between the rotating body 1 and the structure 50 can also be covered with the curable material 80. Furthermore, the gap formed between the bolt 2 and the structure 50 can also be covered with the curable material 80. By these means, the intrusion of fluid (liquid, gas) into the gap can also be suppressed, and crevice corrosion can be suppressed.

[0071] To prevent crevice corrosion, it is only necessary to fill the gap, but it is more preferable to cover the whole because the bonding surface is wider and the curable material becomes integrated, making it easier to prevent detachment. On the other hand, when the rotating body 1 and the structure 50 are made of dissimilar metals, in the case of a structure that covers only a part of the rotating body 1, when a part of the structure 50 is exposed due to peeling of the coating film or the like, the possibility of dissimilar metal contact corrosion occurring is high. Therefore, it is also preferable in terms of preventing this.

[0072] FIG. 17 is a perspective view of a fastening structure 10 according to another embodiment. In the embodiment shown in FIG. 17, in step S10 (FIG. 1. Forming step), at least a part (all in the illustrated example) of the curable material 80 is formed into a cylindrical shape. Therefore, the hard member 3 that has passed through step S6 also has at least a part having a cylindrical shape. By providing the cylindrical hard member 3, the fastening of the rotating body 1 can be released by rotating the cylindrical portion using a releasing jig 70 such as a pipe wrench. In this case, the hard member 3 can be rotated by the releasing jig 70 biting into the side surface 31 of the cylinder.

[0073] FIG. 18 is a perspective view of a fastening structure 10 according to yet another embodiment. Also in the embodiment shown in FIG. 18, similar to the regular hexagonal prism embodiment shown in FIG. 2 above, in step S10 (the forming step), the curable material 80 is formed into a shape having a pair of opposing flat surfaces, and the side surface 81 of the formed curable material 80 and the side surface 11 of the rotating body 1 are parallel. Specifically, the hard member 3 obtained by curing the curable material 80 has side surfaces 31 connecting semi-cylindrical bodies on two opposing surfaces of a rectangular prism such as a cuboid. By having such a structure, the hard member 3 can be rotated by inserting the side surfaces 31, which are a pair of flat surfaces, into a release jig 70 such as a spanner, and the rotating body 1 can be rotated. Also, the side surfaces 31 (flat surfaces and curved surfaces) and the rotation axis L1 of the rotating body 1 are parallel.

[0074] FIG. 19 is a perspective view showing a plurality of fastening structures 10 arranged in a structure 50. A plurality (for example, a large number) of fastening structures 10 may be arranged in the structure 50 as shown in FIG. 19. Therefore, it is preferable that the release of the fastening structure 10 be performed simply and quickly. Thus, it is preferable to use a general-purpose socket 60 and a release jig 70 such as a power tool to release the fastening structure 10. Since the socket 60 is used integrally with the power tool, it is a part of the release jig 70. Therefore, the release jig 70 includes, for example, a power tool and a general-purpose socket 60 that can be rotated by the power tool. The general-purpose socket 60 is, for example, a socket for a power tool into which a regular hexagonal prism can be fitted. Thus, in the example of FIG. 19, the hard member 3 has the shape of a regular hexagonal prism. However, the socket 60 may not be used. When the socket 60 is not used, the release jig 70 is, for example, a general-purpose tool (spanner, wrench, etc.).

[0075] FIG. 20 is a flowchart for explaining a method for releasing the fastening structure 10 of the present disclosure (hereinafter, appropriately referred to as the release method of the present disclosure). FIG. 20 will be described by taking as an example the case where a plurality of fastening structures 10 shown in FIG. 19 above are arranged. The release method of the present disclosure includes steps S11 to S13.

[0076] In step S11, the socket 60 (a part of the release jig 70) is placed over each of the fastening structures 10. Thereby, the release jig 70 supports the hard surface (e.g., the side surface 31 of the hard member 3) of the fastening structure 10. Usually, the inside of the hard member 3 is also hard. Therefore, step S11 (the support step) is a step of supporting the fastening structure 10 having the predetermined shape and the hard surface that is disposed across at least a part of the side surface 11 of the rotating body 1 and the surface of the structure 50 facing the rotating body 1 with the release jig 70. In the illustrated example, the rotating body 1 is a nut. The release jig 70 is a jig for releasing the fastening of the rotating body 1 as described above. The side surface 31 supported by the release jig 70 only needs to be supported to such an extent that a force is applied to the side surface 31 by the rotation of the release jig 70 during rotation in the subsequent step S12 and the rotating body 1 rotates. That is, in step S11, it is preferable that there is no gap between the electric tool and the socket 60 and between the socket 60 and the rotating body 1, but a gap that does not hinder rotation is allowed.

[0077] In step S12, the socket 60 is rotated by an electric tool. That is, step S12 (the rotation step) is a step of rotating the fastening structure 10 (particularly the hard member 3) in the fastening release direction of the structure 50 in a state where the fastening structure 10 is supported by the release jig 70 (an electric tool such as a socket wrench and the socket 60). By this step, the fastening structure 10 is released and the rotating body 1 is loosened (step S13).

[0078] After step S13, the rotating body 1 such as a nut and the bolt are detached from the structure 50. The hard member 3 may adhere to the rotating body 1 and the bolt. Therefore, depending on the type of the hard member 3 (curable material 80), the hard member 3 can be removed by, for example, boiling, dissolution using a solvent, combustion, or the like. In particular, since the rotating body 1 and the bolt are small, they can be easily removed.

Explanation of Reference Numerals

[0079] 1 Rotating body 10 Fastening structure 100 Molding jig 101 Fixed part 102 Fixed part (First fixed part) 103 Fixed part (Second fixed part) 104 Wall part 105 Roof 106 Handle 107 Corner 108 Driving part 11 Side surface 110 Housing (First housing) 111 Housing (Second housing) 112 Housing 113 Shaft 114 Convex part 120 Contact part 121 Space 122 Space 2 Bolt 21 Side surface 3 Rigid member 50 Structure 60 Socket 70 Release jig 80 Curable material 81 Side surface 82 Excess material 83 Notched part 84 Inner surface 85 Space L1 Rotation axis L2 Axis L3 Central axis S1 Step S10 Step (Forming process) S11 Step (Support process) S12 Step (Rotation process) S13 Step S2 Step S3 Step S4 Step S5 Step S6 Step (Hardening process)

Claims

1. a molding process in which a hardening material that hardens when a predetermined condition is satisfied is molded by using a molding jig into a predetermined shape including a portion that supports a release jig that releases the fastening by the rotating body, the hardening material being disposed across a side surface of a rotating body that can fasten a structure by rotating in one direction and can release the fastening by rotating in the other direction and at least a portion of a surface of the structure that faces the rotating body; A hardening step of hardening the hardenable material molded in the molding step, In the molding step, the hardenable material is disposed around at least a portion of the periphery of the rotating body, The hardenable material disposed around the rotor is pressed against the molding jig, so that the hardenable material containing the rotor is molded into the predetermined shape. A method for manufacturing a fastening structure comprising the steps of:

2. In the forming step, at least a portion of the hardenable material is formed into a cylindrical shape. The method for manufacturing the fastening structure according to claim 1 .

3. In the molding step, the hardenable material is molded so that at least a portion of the side surface of the hardenable material that supports the release tool is parallel to the rotation axis of the rotor. The method for manufacturing the fastening structure according to claim 1 .

4. The molding jig is a fixing portion that supports at least one of a side surface of a part in a height direction of the side surface of the rotating body or a side surface of a member that protrudes above the rotating body and has an axis that coincides with the rotation axis of the rotating body; a wall portion that is spaced apart from a side surface of the rotating body when the fixing portion is fixed to the rotating body. The method for manufacturing the fastening structure according to claim 1 .

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