JP2010164129A - Bolt fastening method and fastening bolt device used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the need for coating work after bolt fastening work. <P>SOLUTION: A stepped washer 13 in which a center part 14a on one end side in an axial center direction projects from an outer peripheral part 14b is mounted in an underhead part of a bolt 5 with a relative rotational displacement prevented via a washer fixing jig 16 with the other end surface 15 in the axial center direction brought into close contact with a bolt head 5b. A fastening bolt device 12 is formed by precoating the bolt head 5b, the other end surface 15 in the axial center direction and outer peripheral surface of the stepped washer 13 exposed therearound, and a surface of an outer peripheral part 14b on one end side in the axial center direction and by sticking a packing 17 on the surface of an outer peripheral part 14b on one end side in the axial center direction from above a coating film 18. A shaft part 5a of the bolt 5 is passed through a bolt hole 3 in one steel plate 1 having a surface precoated except the periphery of the bolt hole 3. A center part 14a on one end side in the axial center direction of the stepped washer 13 is brought into close contact with an uncoated part of one steel plate 1. A nut 6 is fastened with the packing 17 sandwiched between the outer peripheral part 14b on one end side in the axial center direction and coated films 18, 18a on one steel plate 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bolt fastening method for fastening a fastening object such as a laminated steel plate with a bolt, and a fastening bolt device used in the method.

  As a method for joining steel plates (including steel plates constituting steel members) with a steel structure such as a steel bridge, a fastening method using high-strength bolts is widely used.

  As fastening using this type of high-strength bolt, for example, when performing bolt fastening of two superposed steel plates, as shown in FIG. Bolt holes 3 and 4 are respectively drilled at corresponding positions of 2, and high-strength bolts 5 are inserted into the bolt holes 3 and 4 of the steel plates 1 and 2 from the outside of one steel plate 1. Then, after fitting the washer 7 to the tip of the shaft portion 5a of the high-strength bolt 5 projecting to the outside of the other steel plate 2, the nut 6 is screwed and tightened to tighten the high-strength bolt 5 A bolting force is applied to the two stacked steel plates 1 and 2 by applying a clamping force from both sides to the two stacked steel plates 1 and 2 by an axial force.

  By the way, in the steel structure, the surface of the steel structure may be coated over the entire surface in accordance with various purposes such as rust prevention or landscape viewpoint. A bolt head 5b of the high-strength bolt 5 that is exposed on the surface of the one steel plate 1 after the two superposed steel plates 1 and 2 are fastened, and the bolt head on the surface of the one steel plate 1 The periphery of the bolt hole 3 around 5b cannot be pre-painted and must be painted after the bolt fastening operation.

  That is, after applying the whole surface of the bolt head 5b of the high strength bolt 5 or the surface of the one steel plate 1, the bolt head 5b of the high strength bolt 5 and the surface of the one steel plate 1 When the high-strength bolt 5 and the nut 6 are fastened with the coating film interposed therebetween, the axial force of the high-strength bolt 5 is released due to the creep of the coating film, and the two laminated steel plates 1, 2 There is a possibility that the bolt fastening portion of the steel plate will not be in a healthy state.

  Therefore, conventionally, the surface around the bolt hole 3 of the one steel plate 1 is left uncoated or coated with inorganic zinc rich paint, and one of the bolt holes 3 and 4 of the two steel plates 1 and 2 Insert the high-strength bolt 5 that is not painted or rust-proofed with a primer from the outside of the steel plate 1, and tighten the nut 6 to the tip of the shaft portion 5 a of the high-strength bolt 5 to perform the above two 11 (b), the bolt head 5b of the high strength bolt 5 and the bolt head 5b on the surface of the one steel plate 1 are I'm trying to paint the surrounding area. Reference numeral 8 denotes a coating film formed by the above-described painting operation, and 5 c denotes a pin tail that is broken when the nut 6 is finally tightened by the high-strength bolt 5.

  For the purpose of facilitating the automation of the bolt fastening operation by the robot, as shown in FIGS. 12 (A), (B) and (C), the opening end of the surface opposite to the surface in contact with the bolt head 9b is shown. A washer 10 provided with a packing locking counterbore 10a over the entire periphery thereof and an annular shape fitted into the counterbore 10a of the washer 10 has an inner diameter that is greater than the outer diameter of the shaft 9a of the bolt 9. The washer 10 in which the packing 11 is fitted in the counterbore 10a is used in a posture in which the counterbore 10a faces the bolt head 9b side. The idea of holding the washer 10 in a state in which the washer 10 is prevented from coming off via the packing 11 by being fitted to the shaft portion 9a of the bolt 9 has been conventionally proposed (see, for example, Patent Document 1).

  Further, after passing the sword tip bolt provided on the tight frame of the folded plate roof through the folded plate roof material (folded plate main body), a nut is screwed into the sword tip bolt and tightened, thereby folding the sword tip bolt onto the tight frame. When attaching a plate roof material, it is widely practiced to provide waterproofing by inserting a packing between a washer attached to the shaft portion of the sword tip bolt and the surface of the folded plate roof material (for example, , See Patent Document 2).

Japanese Patent No. 2755555 Japanese Patent Publication No. 8-16486

  However, at the bolt fastening portion of the two superposed steel plates 1 and 2 with the conventional high-strength bolt 5 shown in FIGS. 11 (a) and 11 (b), the bolt head 5b of the high-strength bolt 5 and one of the surroundings thereof. Since the work of painting the surface of the steel plate 1 needs to be performed as an on-site painting work after the bolt fastening work, the painting work posture is limited according to the arrangement of the bolt fastening portions of the two superposed steel sheets 1 and 2 above. In addition, it is difficult to keep the working environment constant because it is affected by temperature and humidity. Furthermore, it takes time and labor to carry in and out the painting device to the bolt fastening site of the two laminated steel plates 1 and 2, and it is necessary to build a scaffold until the painting work is completed, The actual situation is that the work period is long because the work process of on-site painting is required.

  Therefore, at the bolt fastening portion of the superposed steel plate with the high-strength bolt, the bolt head 5b of the high-strength bolt 5 and the surface of the one steel plate 1 as the fastening target surface are around the bolt head 5b. Although it is desired that the area can be pre-painted so that the on-site painting work after the bolt fastening operation can be omitted, no effective method has been proposed so far.

  In Patent Document 1, it is shown that the washer 10 is held on the shaft portion 9a of the bolt 9 through the packing 11 in a state in which the washer 10 is prevented from coming off, but the relative rotation of the bolt 9 and the washer 10 is described. Since the idea of preventing the displacement is not shown at all, even if the bolt head 9b and the washer 10 of the bolt 9 are pre-painted, if the washer 10 is rotationally displaced relative to the bolt 9, the coating is not performed. The film breaks. Moreover, since the washer 10 has a simple annular shape, it is assumed that the surface and the outer peripheral surface exposed around the bolt head 9b of the bolt 9 are painted except for the surface in contact with the fastening object of the washer. However, there is a problem that continuity with the coating film formed by performing the previous coating on the surface to be fastened cannot be obtained.

  Patent Document 2 discloses the idea of interposing a packing between a washer fitted on the shaft portion of the sword tip bolt and the folded plate roofing material. However, the axial force of the sword tip bolt passes through the packing and the folding is performed. It has a structure that can be transmitted to the roofing material. Therefore, since the axial force escapes due to the creep of the packing, the configuration shown in Patent Document 2 is applied to a bolt fastening portion where a fastening force is applied by a large axial force like a fastening portion using a high-strength bolt. It is not applicable.

  Therefore, the present invention eliminates the need for on-site painting work after the bolt fastening operation of the bolt head of the high-strength bolt and the fastening target surface on which the bolt head is arranged at the bolt fastening portion using the high-strength bolt. It is an object of the present invention to provide a bolt fastening method and a fastening bolt device used for the method.

  In order to solve the above-mentioned problem, the present invention can correspond to claim 1, and the surface on the side to be brought into contact with the fastening object can be closely attached to the surface of the fastening object from the center side to the required diameter at the lower part of the bolt. In addition, a stepped washer that allows a gap to be formed between the outer peripheral side and the surface of the object to be fastened, and a surface of the stepped washer opposite to the surface to be brought into contact with the object to be fastened are bolts. Installed in close contact with the seat surface of the head so as not to be relatively rotationally displaced via a washer fixing jig, and then exposing the outer surface of the bolt head and the stepped washer exposed to the outer peripheral side from the bolt head. The part is pre-painted before the bolt is tightened, and then the outer diameter of the part smaller than the outer diameter of the stepped washer around the bolt hole of the object to be fastened and close to the fastening object of the stepped washer. The surface coating is applied to the area excluding the circular area with a larger diameter. The bolt hole with the stepped washer is inserted through the bolt hole of a certain fastening object, and the portion of the stepped washer that can be in close contact with the fastening object is brought into close contact with the surface of the fastening object, and The fastening object is fastened with bolts with a ring-shaped packing sandwiched between the preceding coating part and the surface coating part of the fastening object on the outer peripheral side of the portion to be brought into close contact with the fastening object of the stepped washer. Bolt fastening method.

  In the above, a washer fixing jig is interposed between the outer peripheral surface of the bolt neck lower portion and the inner peripheral surface of the hole of the stepped washer, and the washer fixing jig is connected to the outer peripheral surface of the bolt neck lower portion. The stepped washer is attached to the lower neck of the bolt so as to be in close contact with the inner peripheral surface of the hole of the stepped washer.

  Further, in each of the above configurations, the outer periphery of the bolt head and the exposed portion of the stepped washer exposed to the outer peripheral side from the bolt head are pre-painted and then the outer periphery of the portion that can be in close contact with the fastening object of the stepped washer After attaching a ring-shaped packing from the top of the coating film to the preceding coating location on the side, the bolt shaft with the stepped washer attached to the bolt hole of the fastening object that has been surface-coated in a predetermined area It is a method to make it pass.

  Further, in accordance with claim 4, the surface to be brought into contact with the fastening object can be in close contact with the surface of the fastening object from the center side to the required diameter, and the outer peripheral side has a gap between the surface of the fastening object. What is the surface on the side where the stepped washer that can be formed is brought into contact with the fastening object of the stepped washer on the lower neck portion of the bolt having a head having an outer diameter smaller than the outer diameter of the stepped washer The opposite surface is attached so as not to be relatively rotationally displaced via a washer fixing jig in a state where the opposite surface is in close contact with the seat surface of the bolt head, and the outer surface of the bolt head and the outer surface exposed from the bolt head are exposed to the outer side. A bolt with a stepped washer formed by painting an exposed portion of the stepped washer, and a fastening bolt having a ring-shaped packing having a diameter that is the same as or slightly smaller than the outer diameter of the stepped washer A device.

  Further, in the above configuration, the washer fixing jig is interposed between the outer peripheral surface of the lower part of the bolt neck and the inner peripheral surface of the hole of the stepped washer, and the outer peripheral surface of the lower part of the bolt neck. And it is set as the structure which makes it closely_contact | adhere to the inner peripheral surface of the hole of a stepped washer.

  Further, in the above-described configuration, the washer fixing jig is formed by surrounding the annular jig body having an inner diameter larger than the outer diameter dimension of the bolt neck lower part and an outer diameter larger than the inner diameter dimension of the hole of the stepped washer. The inner peripheral side protrusions projecting inward to a radial position smaller than the outer diameter dimension of the bolt neck lower part and the outer diameter position larger than the inner diameter dimension of the stepped washer hole at the required direction spacing It is set as the structure formed by providing the outer peripheral side protrusion part which protrudes in direction alternately.

According to the present invention, the following excellent effects are exhibited.
(1) The surface on the side of the bolt to be brought into contact with the fastening object can be in close contact with the surface of the fastening object from the center side to the required diameter, and a gap is formed between the outer peripheral side and the surface of the fastening object. The stepped washer made to be able to be relatively fixed through the washer fixing jig with the surface of the stepped washer opposite to the surface to be brought into contact with the fastening object being in close contact with the seating surface of the bolt head. Next, the outer surface of the bolt head and the exposed portion of the stepped washer exposed to the outer peripheral side from the bolt head are pre-painted before fastening the bolt, and then the fastening object A surface coating is applied to an area excluding a circular area having a diameter smaller than the outer diameter of the stepped washer and larger than the outer diameter of the portion that can be in close contact with the fastening object of the stepped washer. Attach the above stepped washer to the bolt hole of a certain fastening object. The portion of the stepped washer that is in close contact with the fastening object of the stepped washer is brought into close contact with the surface of the fastening object, and at the outer peripheral side of the part of the stepped washer that is in close contact with the fastening object. Since the bolt fastening method is to fasten the fastening object with a bolt with the ring-shaped packing sandwiched between the preceding painting part and the surface painting part of the fastening object, the axial force of the bolt is the bolt head. Further, it can be transmitted to the fastening object via the stepped washer without interposing a coating film. In addition, between the coating area of the part of the outer peripheral side of the part to be brought into close contact with the surface of the fastening object on the surface of the stepped washer that comes into contact with the fastening object, and the coating film of the surface coating part of the fastening object With the sandwiched ring-shaped packing, it is possible to eliminate the possibility that the unpainted portion of the stepped washer and the unpainted portion around the bolt hole on the surface of the fastening object are exposed to the outside.
(2) Therefore, the bolt head of the bolt used for fastening and the field painting work after the bolt fastening work on the surface of the fastening object can be eliminated. Therefore, at the site of the bolt fastening work, the carrying-in / out work of the coating apparatus is not necessary, and the scaffold can be quickly removed after the bolt fastening work, and the construction period can be shortened.
(3) In addition, the painting operation of the predetermined portion of the bolt head and the stepped washer of the bolt and the painting operation of the predetermined portion of the surface of the fastening object can all be performed by prior painting at a factory or the like. The working environment can be stabilized and the coating quality can be improved.
(4) A washer fixing jig is interposed between the outer peripheral surface of the bolt neck lower portion and the inner peripheral surface of the hole of the stepped washer, and the washer fixing jig is stepped with the outer peripheral surface of the bolt neck lower portion. In a state in which the relative rotational displacement of the stepped washer to the lower part of the bolt neck is prevented by attaching the stepped washer to the lower part of the bolt neck in close contact with the inner peripheral surface of the hole of the washer. Can be easily implemented.
(5) Preliminary coating on the outer peripheral side of the portion where the outer surface of the bolt head and the exposed portion of the stepped washer exposed to the outer peripheral side from the bolt head can be in close contact with the fastening object of the stepped washer Attach a ring-shaped packing from the top of the paint film to the location, and then insert the bolt shaft with the above stepped washer into the bolt hole of the fastening object whose surface is coated in a predetermined area. By doing this, the surface of the stepped washer that comes into contact with the object to be fastened is contacted with the surface of the object to be fastened, and the portion of the outer peripheral side of the part to be brought into close contact with the surface of the object to be fastened, The work of sandwiching the packing between the coating films can be easily and reliably performed, and the effect of reducing labor and labor when performing the bolt fastening methods (1) and (4) above is expected. it can.
(6) A step in which the surface to be brought into contact with the fastening object can be in close contact with the surface of the fastening object from the center side to the required diameter, and the outer peripheral side can form a gap with the surface of the fastening object. The bolt head has a surface on the opposite side to the surface of the stepped washer that is brought into contact with the fastening object on the neck lower part of the bolt having a head having an outer diameter smaller than the outer diameter of the stepped washer. The stepped washer is exposed to the outer surface of the bolt head and the outer side of the bolt head, and is attached so as not to be relatively rotationally displaced via a washer fixing jig in close contact with the seat surface of the bolt. Since it is a bolt device with a stepped washer formed by coating, and a fastening bolt device having a structure comprising a ring-shaped packing having a diameter that is the same as or slightly smaller than the outer diameter of the stepped washer, Easy implementation of the bolt fastening method of 1) The ability.
(7) A washer fixing jig is interposed between the outer peripheral surface of the bolt neck lower part and the inner peripheral surface of the hole of the stepped washer so as to be elastically deformed. By adopting a configuration in which the inner surface of the hole of the washer is brought into close contact with the bolt, it is possible to easily realize mounting in a state in which relative rotational displacement of the stepped washer to the lower part of the bolt neck is prevented.
(8) Necessary circumferential spacing of an annular jig body having an inner diameter larger than the outer diameter of the bolt neck and an outer diameter larger than the inner diameter of the hole of the stepped washer And projecting outward to a radial position larger than the inner diameter dimension of the hole of the stepped washer, and an inner circumferential projection projecting inward to a radial position smaller than the outer diameter dimension of the bolt neck lower part. By adopting a configuration in which the outer peripheral side protrusions are alternately provided, the outer periphery of the lower part of the bolt neck is utilized by using the restoring force when the jig body as a ring of the washer fixing jig is elastically deformed inward and outward. The inner protrusion on the surface and the outer protrusion on the inner surface of the hole in the step washer can be closely attached to prevent relative rotational displacement of the step washer to the bottom of the bolt neck. Can be easily installed via the washer fixing jig. .

BRIEF DESCRIPTION OF THE DRAWINGS The bolt apparatus for fastening used for the bolt fastening method of this invention is shown, (A) is the state which isolate | separated each structural member, (B) is a general | schematic cutting side view which respectively shows the state which assembled each structural member. . FIG. 2 is an enlarged view of an example of a washer fixing jig in the apparatus of FIG. 1, (A) is a plan view showing a state where no external force is acting, and (B) is a step and an outer peripheral surface of a shaft portion of a high-strength bolt. It is a top view which shows the state interposed in the clearance gap with the internal peripheral surface of the hole of a washer. FIG. 3 is a side view of the inner peripheral protrusion and the outer peripheral protrusion provided on the washer fixing jig in FIG. 2, and (A) is an end of the inner peripheral protrusion and the outer peripheral protrusion that are separated in the axial direction. FIG. 2 (b) shows the case where diagonal notches are provided at the edges, and FIG. 2B shows the case where diagonal notches are provided at both ends in the axial direction of the inner peripheral protrusion and the outer peripheral protrusion. It is the figure seen from the AA arrow direction. Fig. 1 shows the manufacturing procedure of the device in Fig. 1. (a) shows a state where a washer fixing jig is attached to the lower part of the neck of the high-strength bolt, and (b) shows a state where the washer fixing jig is attached to the lower part of the neck of the high-strength bolt. It is a general | schematic cut side view which shows the state which attached the stepped washer. In the manufacturing procedure of the apparatus of FIG. 1, the stepped washer shown in FIG. 4 (b) is attached using the tightening force of the nut against the shaft portion of the high-strength bolt, and the masking film is used. It is a schematic cut | disconnection side view which shows the state which masked the end surface and bolt axial part of the axial center one end side center part of a washer. FIG. 6 is a partially cut schematic side view showing a state where the bolt head of the high-strength bolt and a predetermined portion of the stepped washer are coated in the state shown in FIG. 5 in the manufacturing procedure of the apparatus of FIG. 1. 1 is a schematic cut side view showing a state in which prior coating is performed on a predetermined portion of the surface of a steel plate to be fastened when the device of FIG. 1 is manufactured and a bolt to be fastened is fastened by the manufactured fastening bolt device. FIG. In the procedure of the bolt fastening method performed using the apparatus of FIG. 1, the process following FIG. 7 is shown and it is a schematic cut side view which shows the state which fastened the two laminated steel plates with the axial force of the high strength bolt. . As another embodiment of the present invention, the bolt fastening method of the present invention is applied to replacement of a high-strength bolt with a bolt head exposed on the surface of a steel plate and an existing coating film formed around the bolt head. (B) shows a state in which the existing high-strength bolt is removed, and (b) shows a state in which the apparatus shown in FIG. FIG. As another embodiment of the present invention, the bolt fastening method of the present invention is applied to replacement of a high-strength bolt with a bolt head exposed on the surface of a steel plate and an existing coating film formed around the bolt head. (B) is a stepped washer in which the outer diameter of the central part at one axial end is thinner than the outer diameter of the bolt head. It is a general | schematic cut side view which shows the state which manufactured the apparatus of FIG. Fig. 2 shows a bolt fastening state of two superposed steel plates using a high strength bolt that is generally used in the prior art. (A) is a schematic side view of the fastening portion and (b) is a bolt head of a high strength bolt. It is a general | schematic cutting side view which shows the state which gave the coating around it. A conventional method for attaching a washer to a shaft portion of a bolt in advance is shown. (A) is a schematic side view, (B) is a view of the washer viewed from the tip side of the bolt, and (C) is ( It is a BB direction arrow enlarged view of b).

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  1 (a) (b) to FIG. 8 show two embodiments of the bolt fastening method of the present invention and the fastening bolt device used in the method, as shown in FIGS. 11 (b) and 11 (b). An application example when the stacked steel plates 1 and 2 are set as fastening objects is shown as follows.

  That is, FIGS. 1 (a) (b) to 3 (a) (b) show the fastening bolt device 12 used in the bolt fastening method of the present invention, and the surface on the side in contact with the fastening object is the center. As a stepped washer 13 that can be in close contact with the surface of the fastening object from the side to the required diameter and that can form a gap with the surface of the fastening object, for example, the side that contacts the fastening object A stepped washer 13 having a configuration in which a central portion 14a on one end side in the axial center direction is provided with a step projecting a required dimension from the outer peripheral portion 14b is provided with an outer portion smaller than the diameter of the outer peripheral portion of the stepped washer 13. On the outer periphery of the shaft portion 5a at the bottom of the neck of the high-strength bolt 5 having a bolt head 5b having a diameter, the axial direction other than the surface of the stepped washer 13 on the side opposite to the surface to be brought into contact with the fastening object The end surface 15 is disposed in close contact with the seat surface (inner surface) of the bolt head 5b. The stepped lock washer 13 is attached while preventing relative rotational displacement through the washer fixing jig 16 into high-strength bolts 5.

  Further, the outer surface of the bolt head 5b of the high-strength bolt 5, the other axial end surface 15 exposed around the bolt head 5b by the stepped washer 13, the outer peripheral surface of the stepped washer 13 and the shaft A series of coating films 18 are provided by coating on the surface of the outer peripheral portion 14b on the one end side in the central direction.

  Further, the packing 17 is concentrically attached from the top of the coating film 18 to the surface side of the outer peripheral portion 14b on one end side in the axial direction of the stepped washer 13.

  More specifically, the stepped washer 13 has an outer diameter larger than the bolt head 5b of the high strength bolt 5 and a required thickness dimension in the axial direction, and a central portion 14a on one end side in the axial direction. The outer peripheral portion 14b is located closer to the other end in the axial direction with respect to the required dimension, and the other axial end surface 15 has a flat shape.

  As shown in FIG. 2 (a), the washer fixing jig 16 is made of a material having required elasticity, for example, a resin such as polypropylene, for example, from the axial direction dimension (thickness dimension) of the stepped washer 13. The axial dimension is slightly smaller and the inner diameter dimension x is slightly larger (x> a) than the outer diameter dimension a (see FIG. 1 (a)) of the shaft portion 5a at the lower neck of the high-strength bolt 5, and the outer An annular jig body 16a having a diameter y slightly smaller than an inner diameter dimension b of the hole of the stepped washer 13 (see FIG. 1 (a)) (y <b) is provided. The inner circumferential dimension x1 (x1 <a) slightly smaller than the outer diameter dimension a of the shaft portion 5a at the lower part of the neck of the high-strength bolt 5 An inner peripheral protrusion 16b protruding in the direction is provided, and an outer peripheral surface of the jig body 16a is provided. An outer diameter dimension x1 (a little larger than the inner diameter dimension b of the hole of the stepped washer 13 at a circumferentially required interval position (four positions in the figure) that is shifted in the circumferential direction from the inner circumferential projection 16b. The outer peripheral side protrusion 16c that protrudes outward to a position where x1> b) is provided. As a result, the washer fixing jig 16 is connected to the outer peripheral surface of the shaft portion 5a at the lower part of the neck of the high-strength bolt 5 and the inner peripheral surface of the hole of the stepped washer 13 as shown in FIG. If the inner peripheral side protrusions 16b are provided in the jig body 16a, the inner peripheral side protrusions 16b are connected to the necks of the high-strength bolts 5. By contacting the outer peripheral surface of the lower shaft portion 5a, the annular jig body 16a is elastically deformed outward in the radial direction, while each jig-side protrusion 16c is provided on the jig body 16a. In the portion, the jig body 16a is elastically deformed inward in the radial direction by the outer peripheral projections 16c coming into contact with the inner peripheral surface of the stepped washer 13. Therefore, the inner circumferential and outer circumferential projections 16b and 16c are provided at the predetermined locations in the circumferential direction by the restoring force of the annular jig body 16a that is alternately elastically deformed in the inner and outer directions. The side protrusions 16b are brought into close contact with the outer peripheral surface of the shaft portion 5a at the bottom of the high-strength bolt 5 so that the relative displacement of the washer fixing jig 16 with respect to the high-strength bolt 5 can be prevented. The outer peripheral projections 16c are firmly brought into close contact with the inner peripheral surface of the hole of the stepped washer 13 so that the relative rotational displacement of the washer fixing jig 16 with respect to the stepped washer 13 can be prevented. Thus, the stepped washer 13 can be attached to the shaft portion 5a at the lower part of the neck of the high-strength bolt 5 via a washer fixing jig 16 while preventing relative rotational displacement.

  Further, as shown in FIG. 3 (a), the inner peripheral projections 16b and the outer peripheral projections 16c of the washer fixing jig 16 have edge portions separated from each other in the axial direction, for example, FIG. In (a), the lower end edge part of the inner peripheral side protrusion part 16b and the upper end edge part of the outer peripheral side protrusion part 16c are provided with oblique notches inclined at a required angle from the axial direction. Accordingly, when the washer fixing jig 16 is fitted to the shaft portion 5a of the high strength bolt 5, the high strength bolt 5 can be fitted by fitting from the side where the notch is provided in the inner peripheral projection 16b. The inner peripheral projection 16b of the washer fixing jig 16 can be guided on the outer periphery of the shaft portion 5a. Furthermore, with respect to the washer fixing jig 16 that has been moved to the lower neck along the shaft portion 5a of the high-strength bolt 5, the stepped washer from the side where the notches of the outer peripheral projections 16c are provided. By pressing 13, each outer peripheral projection 16 c of the washer fixing jig 16 can be guided to the inside of the stepped washer 13. Therefore, the labor required for attaching the stepped washer 13 via the washer fixing jig 16 to the shaft portion 5a at the lower part of the neck of the high strength bolt 5 can be reduced.

  In addition, as shown in FIG. 3 (b), diagonally inclined at a required angle from the axial direction at both end edges in the axial direction of the protrusions 16b, 16c on the inner peripheral side and the outer peripheral side of the washer fixing jig 16. It is good also as a structure which provided each notch. In this way, when the washer fixing jig 16 is fitted on the outer periphery of the shaft portion 5a of the high-strength bolt 5, it is not necessary to consider the orientation of the washer fixing jig 16 in the axial direction. This can be further improved.

  The packing 17 is made of a flexible material that does not allow air and water to pass therethrough, for example, rubber such as silicon rubber, and the thickness dimension in a state where no external force is applied to the packing 17 is one end in the axial direction of the stepped washer 13. It is configured to be larger than the projecting dimension of the axial center one end side central portion 14a projecting from the side outer peripheral portion 14b. Thus, the end face of the central portion 14a in the axial direction one end side of the stepped washer 13 is arranged in a state where the packing 17 is concentrically disposed on the surface side of the outer peripheral portion 14b in the axial direction one end of the stepped washer 13. When closely attached to the surface of a required steel plate to be fastened, the gap is formed on the outer peripheral side between the surface of the required steel plate and the outer peripheral portion 14b on one end side in the axial direction of the stepped washer 13. The packing 17 is sandwiched and compressed, and the compressed packing 17 comes into close contact with both the surface of the required steel plate and the outer peripheral portion 14b on one end side in the axial direction of the stepped washer 13 so that the inner side of the packing 17 This space can be blocked from the outside while maintaining water-tightness and airtightness.

  In addition, the same components as those shown in FIGS. 11A and 11B are denoted by the same reference numerals.

  When using the fastening bolt device of the present invention having the above-described configuration to fasten the two laminated steel plates 1 and 2 similar to those shown in FIGS. First, as shown in FIG. 4A, the washer fixing jig 16 is fitted to the outer periphery of the shaft portion 5a at the lower neck portion of the high strength bolt 5.

  Next, the stepped washer 13 is arranged so as to be loosely fitted to the shaft portion 5a of the high-strength bolt 5 from the axial direction other end surface 15 side, and as shown in FIG. The washer 13 is forcibly fitted to the outer periphery of the washer fixing member 16 attached to the lower part of the neck of the high strength bolt 5, and the axially other end surface 15 of the stepped washer 13 is attached to the bolt of the high strength bolt 5. The stepped washer 13 is attached to the lower part of the neck of the high-strength bolt 5 through the washer fixing jig 16 so as to prevent relative rotational displacement so as to be in close contact with the head 5b.

  Next, the end surface of the axial center one end side central portion 14 a that is a surface to be brought into close contact with the fastening object of the stepped washer 13 and the shaft portion 5 a of the bolt 5 are masked.

  In addition, the stepped washer 13 is fitted on the outer periphery of the washer fixing jig 16 attached to the lower part of the neck of the high strength bolt 5 in the process shown in FIG. In order to allow the end face 15 to be in close contact with the bolt head 5b of the high-strength bolt 5 and the masking work of the end face of the one end side central portion 14a and the bolt shaft portion 5a simultaneously and easily. For example, as shown in FIG. 5, after the stepped washer 13 is loosely fitted on the shaft portion 5a of the high strength bolt 5 to which the washer fixing jig 16 is attached, A masking film 19 provided with a bolt insertion hole (not shown) and a washer 7 may be fitted into the shaft portion 5a of the bolt 5 in this order, and the nut 6 may be screwed to tighten the nut 6. By doing so, the stepped washer 13 is pushed together with the washer 7 and the masking film 19 to the bolt head 5b side by the tightening force of the nut 6 tightened on the shaft portion 5a of the high-strength bolt 5, and the step The washer 13 is fitted to the outer periphery of the washer fixing jig 16 attached to the lower part of the bolt neck, and the axially other end surface 15 of the stepped washer 13 is easily brought into close contact with the bolt head 5b of the high strength bolt 5. be able to. Further, the masking film 19 sandwiched between the stepped washer 13 and the washer 7 can be masked by being brought into close contact with the end surface of the central portion 14a on one end side in the axial direction of the stepped washer 13. At the same time, the masking film 19 that spreads out of the washer 7 and the nut 6 can mask the bolt shaft portion 5a.

  After masking the end face of the central portion 14a in the axial direction of the stepped washer 13 and the bolt shaft portion 5a as described above, the bolt head 5b of the high-strength bolt 5 as shown in FIG. A portion of the stepped washer 13 that is exposed around the bolt head 5b at the axially other end surface 15; an outer peripheral surface of the stepped washer 13; and a surface of the axially one end outer peripheral portion 14b. Further, of the two superposed steel plates 1 and 2 to be fastened, the same coating as the desired coating on the surface of one steel plate 1 (see FIG. 1 (a)) where the bolt head 5b is finally arranged. Pre-paint. As a result, a series of coatings from the bolt head 5b of the high-strength bolt 5 to the exposed portion of the axially other end surface 15 of the stepped washer 13 and the outer peripheral surface to the surface of the axially outer peripheral portion 14b. A film 18 is formed. In addition, since the end face of the central portion 14a in the axial direction where the axial force of the high-strength bolt 5 acts on the stepped washer 13 is masked in advance, the shaft in the coating step is performed. There is no problem even if the coating is performed up to the outer peripheral surface of the central portion 14a in the axial direction protruding from the outer peripheral portion 14b in the axial direction.

  Thereafter, the nut 6 and the washer 7 and the masking film 19 are removed, and the coating film 18 on the surface of the outer peripheral portion 14b in the axial center direction of the stepped washer 13 is cured, and as shown in FIG. The fastening bolt device 12 of the present invention is manufactured by attaching the packing 17 to the surface side of the outer peripheral portion 14b on the one end side in the center direction from above the coating film 18 through a seal (not shown). As described above, if the packing 17 is pasted on the coating film 18 formed on the surface of the outer peripheral portion 14b on the one end side in the axial direction, the packing 17 is attached to the stepped portion in the bolt fastening operation described later. Since it becomes possible to easily and reliably perform the operation of sandwiching at a predetermined position between the outer peripheral portion 14b on the one end side in the axial direction of the washer 13 and the surface of the fastening object, This is advantageous for reducing labor.

  On the other hand, on the surface of one steel plate 1 to be arranged in a state where the bolt head 5b of the high-strength bolt 5 used for fastening is exposed among the two stacked steel plates 1 and 2 to be fastened. As shown in FIG. 7, it is larger than the outer diameter of the central portion 14a in the axial direction one end side of the stepped washer 13 around the bolt hole 3 provided in the one steel plate 1 at a factory or the like in advance. In addition, the pre-coating is performed on the entire surface excluding the circular area having a diameter smaller than the inner diameter of the packing 17. Reference numeral 18a denotes a coating film formed by the preceding coating.

  Thereafter, as shown in FIG. 8, one steel plate 1 subjected to the above-mentioned pre-coating is placed at the position of the bolt holes 3, 4 on the steel plates 1, 2 at the site of fastening work with the other steel plate 2. In a state where the two bolts 3 and 4 are arranged and overlapped, the shaft portion 5a of the high-strength bolt 5 of the fastening bolt device 12 of the present invention is inserted into the bolt holes 3 and 4 from the outside of the one steel plate 1, and the other After fitting the washer 7 to the tip of the shaft portion 5a of the high-strength bolt 5 that protrudes outside the steel plate 2, the nut 6 is screwed, and in the same manner as tightening the nut to a normal torcia-type high-strength bolt, Using a predetermined tool, the nut 6 is tightened with a predetermined torque at which the pin tail 5c of the high-strength bolt 5 is broken. Thereby, when the axial force of the high-strength bolt 5 is applied by tightening the nut 6, the end surface of the central portion 14a in the axial direction one end side where the stepped washer 13 is not coated is Since the steel plate 1 comes into close contact with the surface of the unpainted portion at the peripheral edge of the bolt hole 3 of the steel plate 1, the axial force of the high-strength bolt 5 is applied from the bolt head 5b and the nut 6 to the stepped washer 13 and the washer. 7, the two laminated steel plates 1 and 2 can be acted as tightening forces from both sides, so that the two laminated steel plates 1 and 2 are bolted by this tightening force. At this time, since the coating film is not interposed in the axial force transmission path, there is no possibility that the axial force is lost due to the creep of the coating film.

  Further, the stepped washer 13 is attached to the shaft portion 5a of the high-strength bolt 5 with a washer fixing jig 16 in a state in which relative rotational displacement is prevented. Damage to the coating head 18 provided on the surface of the bolt head 5b of the high-strength bolt 5 and the exposed portion, the outer peripheral surface, and the outer peripheral portion 14b on the one end side in the axial direction of the stepped washer 13 In addition, the coating film 18a is formed on the surface of the outer peripheral portion 14b on the one end side in the axial direction where the coating film 18 is provided and the surface of the one steel plate 1 is formed by preceding coating. The packing 17 is interposed in a compressed state, and the packing 17 is applied to the coating 18 on the outer circumferential portion 14b in the axial direction of the stepped washer 13 and the coating 18a of the one steel plate 1. The above steps located inside the packing 17 The central portion 14a on the one end side in the axial direction of the washer 13 and the unpainted portion of the peripheral edge portion of the bolt hole 3 of the one steel plate 1 are connected to the outside of the packing 17 in a state in which waterproofness and airtightness are ensured. Since it will be interrupted | blocked, the possibility that this unpainted part may be exposed is eliminated.

  Thus, according to the bolt fastening method of the present invention and the fastening bolt device used in the method, the bolt head 5b of the high-strength bolt 5 used for fastening the two laminated steel plates 1 and 2, and the one of the above The work of painting the periphery of the bolt hole 3 of the steel sheet 1 after the bolt fastening work can be made unnecessary. Therefore, at the bolt fastening work site of the two laminated steel plates 1 and 2, the work of carrying in / out the coating apparatus is not required, the scaffold can be quickly removed after the bolt fastening work, and the construction period is shortened. Can be achieved.

  Furthermore, the painting operation of the predetermined portion of the bolt head 5b and the stepped washer 13 of the high-strength bolt 5 and the coating operation of the predetermined portion of the one steel plate 1 can all be performed in advance by a factory or the like. Therefore, the working environment can be stabilized and the coating quality can be improved.

  Next, as another embodiment of the present invention, FIGS. 9 (a) and 9 (b) show the bolt fastening method and the fastening bolt device of the present invention on the surface of the steel plate on the bolt head exposed on the surface of the steel plate. The example applied when replacing | exchanging the high strength volt | bolt in which the coating film connected to the coating film provided in is already constructed is shown.

  That is, for example, as shown in FIG. 11 (b), two superposed steel plates 1 and 2 are bolted by high-strength bolts 5, and the surface of one steel plate 1 and the one steel plate 1 are When the high strength bolt 5 is removed from the bolt head 5b of the high strength bolt 5 exposed on the surface, as shown in FIG. The existing coating film 8 is cut around the bolt head 5b of the force bolt 5.

  In this case, as shown in FIG. 9 (B), the fastening bolt device 12 of the present invention is manufactured in the same procedure as shown in FIGS. 4 (A), (B) to FIG. ), The existing coating film 8 remaining on the surface of the one steel plate 1 is centered on the bolt hole 3 provided in the one steel plate 1, and the fastening bolt of the present invention is used. The coating film 8 in the circular section having a diameter larger than the outer diameter dimension of the central portion 14a on one end side in the axial center direction of the stepped washer 13 in the apparatus 12 and smaller than the inner diameter of the packing 17 is removed, and the one steel sheet is removed. The surface of the base material 1 is exposed.

  In addition, the operation | work which removes the coating film 8 in the predetermined division centering on the said bolt hole 3 of said one steel plate 1 is normally work from the surface side in which the coating film 8 of said one steel plate 1 is provided. If it is difficult to access the work site from the surface side of the one steel plate 1 such as the lower surface side of the bridge, the bolt holes 3 and 4 of the two superposed steel plates 1 and 2 are inserted. The other steel plate 2 on the back side of the one steel plate 1 using a tool, for example, a tool with a file attached to the tip of an L-shaped or J-shaped arm through which the bolt holes 3 and 4 can be inserted. You may make it perform the removal operation | work of the coating film 8 in the said predetermined division from the side.

  After forming the predetermined unpainted section from which the coating film 8 is removed around the bolt hole 3 of one steel plate 1 as described above, the two superposed steel plates are similar to those shown in FIG. After the shaft portion 5a of the high-strength bolt 5 of the fastening bolt device 12 of the present invention is inserted into the bolt holes 3 and 4 of 1 and 2 from the outside of the one steel plate 1, the outside of the other steel plate 2 is inserted. The washer 7 is fitted to the tip of the shaft portion 5a of the high-strength bolt 5 protruding to the end, and the nut 6 is screwed to tighten the nut 6 with a predetermined torque. Thereby, the end surface of the axial direction one end side central part 14a where the stepped washer 13 of the fastening bolt device 12 of the present invention is not coated is the uncoated section around the bolt hole 3 of the one steel plate 1. In order to come into close contact with the surface of the steel sheet without interposing a coating film, the axial force of the high-strength bolt 5 can be applied to the two laminated steel plates 1 and 2 as tightening force from both sides. become able to.

  Furthermore, the coating film 18 provided on the back surface of the outer peripheral portion 14b in the axial direction of the stepped washer 13 of the fastening bolt device 12 of the present invention, and the existing coating film 8 on the surface of the one steel plate 1 Since the packing 17 is interposed therebetween and comes into close contact with each of the coating films 18 and 8, the axial center one end side central portion 14a of the stepped washer 13 located inside the packing 17 and The unpainted portion provided at the peripheral edge of the bolt hole 3 of the one steel plate 1 can be shut off from the outside of the packing 17 in a state where water-tightness and airtightness are ensured. Can be eliminated.

  Next, FIG. 10 (a) (b) shows an existing coating film on the bolt head exposed on the surface of the steel plate as shown in FIG. 9 (b) (b) as still another embodiment of the present invention. FIG. 10 shows an application example when the high-strength bolt in which the steel is installed is replaced. As shown in FIG. 10 (a), the two stacked steel plates are the same as shown in FIG. 9 (a). After removing the high-strength bolt 5 on which the existing coating film is applied to the bolt head 5b exposed on the surface of one of the steel plates 1 of 1 and 2, as shown in FIG. (B) When the fastening bolt device 12 of the present invention is manufactured in the same procedure as shown in FIG. 7 to FIG. 7, the outer diameter dimension of the central portion 14a in the axial direction one end side is the stepped washer 13. Fastening of the present invention using a stepped washer 13 having a required dimension smaller than the outer diameter of the bolt head 5b of the high strength bolt 5 So as to produce a bolt device 12. As a result, in the stepped washer 13, the end surface of the central portion 14 a on the one end side in the axial direction is in contact with the bolt head 5 b of the existing high-strength bolt 5 on the surface of the one steel plate 1. The film 8 can be brought into close contact with the peripheral edge portion of the unpainted bolt hole 3.

  The outer diameter of the stepped washer 13 and the inner diameter of the packing 17 constituting the fastening bolt device 12 of the present invention are larger than the outer diameter of the bolt head 5b of the high-strength bolt 5. Thus, after the existing high-strength bolt 5 is removed, the existing coating film 8 remaining on the surface of the one steel plate 1 and the coating on the surface of the outer circumferential portion 14b in the axial direction of the stepped washer 13 are applied. It is assumed that the packing 17 can be sandwiched between the membrane 18.

  Therefore, after that, as shown in FIG. 8, the high strength of the fastening bolt device 12 of the present invention is applied to the bolt holes 3 and 4 of the two stacked steel plates 1 and 2 from the outside of the one steel plate 1. After inserting the shaft portion 5a of the bolt 5, the nut 6 is screwed onto the tip of the shaft portion 5a of the high-strength bolt 5 protruding outside the other steel plate 2, and the nut 6 is screwed. When the nut 6 is tightened with a predetermined torque, the end surface of the central portion 14a in the axial direction end side where the stepped washer 13 of the fastening bolt device 12 of the present invention is not coated is the one steel plate 1. In order to come into close contact with the surface of the peripheral edge of the bolt hole 3 where the existing coating film 8 does not exist, the axial force of the high-strength bolt 5 is applied to the two layers without interposing the coating film. The laminated steel plates 1 and 2 can act as tightening forces from both sides. Kill as to become.

  Furthermore, between the coating film 18 provided in the axial direction one end side outer peripheral part 14b of the step washer 13 of the fastening bolt device 12 of the present invention and the existing coating film 8 on the surface of the one steel plate 1. Since the packing 17 is interposed and comes into close contact with both of the coating films 18 and 8, the axial center one end side central portion 14a of the stepped washer 13 located inside the packing 17 and the above In the peripheral part of the bolt hole 3 of one steel plate 1, when the existing high-strength bolt 5 is removed, the non-painted portion formed by the existing coating 8 being cut off ensures water-tightness and airtightness. In this state, it can be shielded from the outside of the packing 17 and the possibility that the unpainted portion is exposed can be solved.

  In addition, this invention is not limited only to said each embodiment, The step washer 13 can closely_contact | adhere to the surface of a fastening object from the center side to a required diameter from the side made to contact a fastening object. If the outer peripheral side can form a gap with the surface of the fastening object, for example, the outer peripheral part of the axial direction one end side outside the central part 14a in the axial direction that can be in close contact with the fastening object. The shape of the other end side in the axial direction may be a shape of the high-strength bolt 5 used for fastening. Any shape that can receive an axial force from the bolt head 5b may be used, and for example, a shape other than the illustrated shape may be used, such as a shape in which a central portion on the other end side in the axial center direction protrudes from the outer peripheral portion.

  In the washer fixing jig 16, the number of protrusions 16b and 16c on the inner peripheral side and the outer peripheral side provided in the circumferential direction of the jig main body 16a may be appropriately changed. In addition, by interposing within the thickness dimension of the stepped washer 13 between the outer peripheral surface of the lower portion of the neck of the high strength bolt 5 and the inner peripheral surface of the hole of the stepped washer 13 in an elastically deformed state, Due to the restoring force, the high strength bolt 5 is brought into close contact with both the outer peripheral surface of the neck lower portion and the inner peripheral surface of the hole of the stepped washer 13, and the stepped washer 13 is relatively attached to the lower neck portion of the high strength bolt 5. As long as it can be mounted in a state where rotational displacement is prevented, it may be made of resin other than polypropylene, and further, an arbitrary material having elasticity may be used. Furthermore, structures other than those shown in FIGS. 2A and 2B and FIGS. 3A and 3B may be used.

  The packing 17 is made of a flexible material that does not allow air and water to pass through. When the compression is sandwiched between the outer peripheral portion 14b in the axial direction of the stepped washer 13 and the surface of the fastening object, the packing 17 is restored. In the state where the inner space of the packing 17 is kept watertight and airtight by being in close contact with both the outer peripheral portion 14b on the one end side in the axial center direction of the stepped washer 13 and the surface of the fastening object. Any material can be used as long as it can be blocked from the outside.

  The thickness dimension and diameter dimension of the stepped washer 13, the axial dimension one end side center part 14 a diameter dimension, the protruding amount from the axial center one end side outer peripheral part 14 b, the thickness dimension and diameter dimension of the packing 17, the coating films 8, 18, The thickness dimension of 18a is a convenient dimension for illustration, and may be appropriately changed according to the size of the high-strength bolt 5 actually used, the properties of the paint, and the like.

  When coating the bolt head 5b of the high-strength bolt 5 and the stepped washer 13 at a predetermined location, the end surface of the central portion 14a in the axial direction and the bolt that are the surfaces to be brought into close contact with the fastening object of the stepped washer 13 If the shaft portion 5a can be masked, masking can be performed by any method other than the method in which the masking film 19 is brought into close contact with the central portion 14a in the axial direction of the stepped washer 13 by the nut 6 screwed to the bolt shaft portion 5a. May be.

  Of course, various modifications can be made without departing from the scope of the present invention.

1 Steel plate (object to be fastened)
3 Bolt hole 5 Bolt 5a Shaft part 5b Bolt head 6 Nut 8 Coating film 13 Stepped washer 14a Axis direction one end side central part 14b Axial direction one end outer peripheral part 15 Axial direction other end face 16 Washer fixing jig 16a Jig Main body 16b Inner peripheral protrusion 16c Outer peripheral protrusion 17 Packing 18, 18a Coating film

Claims (6)

  The surface of the bolt that is in contact with the object to be fastened can be in close contact with the surface of the object to be fastened from the center side to the required diameter, and the outer peripheral side can form a gap with the surface of the object to be fastened. The stepped washer is relatively rotationally displaced via a washer fixing jig with the surface opposite to the surface of the stepped washer coming into contact with the object to be fastened in close contact with the seating surface of the bolt head. Next, the outer surface of the bolt head and the exposed portion of the stepped washer exposed to the outer peripheral side from the bolt head are pre-painted before fastening the bolt, and then the bolt hole of the fastening object The fastening object is surface-coated in a region excluding a circular area having a diameter smaller than the outer diameter of the stepped washer and larger than the outer diameter of the portion that can be in close contact with the fastening object of the stepped washer. Bolt with the above stepped washer attached to the bolt hole of the object. The portion of the stepped washer that can be in close contact with the fastening object is brought into close contact with the surface of the fastening object, and the portion of the stepped washer that is in close contact with the fastening object A bolt fastening method, wherein a fastening object is fastened with a bolt in a state where a ring-shaped packing is sandwiched between a preceding painting part and a surface coating part of the fastening object.   A washer fixing jig is interposed between the outer peripheral surface of the lower part of the bolt neck and the inner peripheral surface of the hole of the stepped washer, and the washer fixing jig is attached to the outer peripheral surface of the lower part of the bolt neck and the hole of the stepped washer. The bolt fastening method according to claim 1, wherein a stepped washer is attached to a lower part of the bolt neck so as to be in close contact with the inner peripheral surface of the bolt.   After the preceding painting of the outer surface of the bolt head and the exposed portion of the stepped washer exposed to the outer peripheral side from the bolt head, in the preceding coating location on the outer peripheral side of the portion that can be in close contact with the fastening object of the stepped washer, A ring-shaped packing is applied from above the coating film, and then the shaft portion of the bolt to which the stepped washer is attached is inserted through the bolt hole of the fastening object whose surface is coated in a predetermined region. The bolt fastening method according to 1 or 2.   A stepped washer that allows the surface to be brought into contact with the object to be fastened to be in close contact with the surface of the object to be fastened from the center side to the required diameter and that the outer peripheral side can form a gap with the surface of the object to be fastened. The surface of the bolt head having a surface opposite to the surface to be brought into contact with the fastening object of the stepped washer at the lower neck portion of the bolt having a head having an outer diameter smaller than the outer diameter of the stepped washer Attach to the outer surface of the bolt head and the exposed portion of the stepped washer exposed to the outer peripheral side from the bolt head. A fastening bolt device comprising: a bolt with a stepped washer, and a ring-shaped packing having a diameter that is the same as or slightly smaller than the outer diameter of the stepped washer.   A washer fixing jig is interposed between the outer peripheral surface of the lower part of the bolt neck and the inner peripheral surface of the hole of the stepped washer so that the outer peripheral surface of the lower part of the bolt neck and the stepped washer The fastening bolt device according to claim 4, wherein the fastening bolt device is brought into close contact with an inner peripheral surface of the hole.   The washer-fixing jig is disposed at a required interval in the circumferential direction of an annular jig body having an inner diameter larger than the outer diameter dimension of the bolt neck lower part and an outer diameter larger than the inner diameter dimension of the hole of the stepped washer. An inner peripheral protrusion that protrudes inward to a radial position smaller than the outer diameter dimension of the bolt neck lower part, and an outer peripheral protrusion that protrudes outward to a radial position larger than the inner diameter dimension of the hole of the stepped washer. The fastening bolt device according to claim 5, wherein the parts are alternately provided.

Images