JP2009121646A - Steel plate joining method and bolt temporary fixing nut used for this method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a bolt held in advance in a bolt hole from co-rotating when fastening a nut. <P>SOLUTION: This bolt temporary fixing nut 13 having an outside diametrical dimension of a diameter a little larger than the bolt hole 3 of a bottom steel plate 1, is screwed in a shaft part 5a of the bolt 5. The bolt temporary fixing nut 13 is forcibly pushed in the bolt hole 3 of the bottom steel plate 1 together with the bolt 5. The bolt temporary fixing nut 13 is fixed in close contact to the inside of the bolt hole 3 by restoring force from a state of being compressed in the radial direction by a clearance between an inner peripheral surface of the bolt hole 3 and the bolt 5. Then, the bolt 5 is fastened in the bolt temporary fixing nut 13, and is temporarily fixed so as not to rotate the bolt 5 by fastening axial force. Then, after placing a splice plate 2 on the bottom steel plate 1, the nut 6 is fastened to the bolt 5, and the bottom steel plate 1 and the splice plate 2 are joined. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a steel plate joining method used for joining overlapping portions of steel plates using bolts, and a bolt temporary fixing nut used in the method.

  In recent years, as a floor slab for constituting a bridge, the formwork forming the lower surface of the concrete layer of the floor slab is used as a panel-shaped bottom steel plate, and concrete is directly placed inside the bottom steel plate, thereby Synthetic floor slabs of the type in which steel plates and concrete layers are joined together have come to be used.

  In order to construct this type of composite floor slab, first, after arranging the bottom steel plates in the radial direction on the main girder, it is necessary to connect the adjacent bottom steel plates.

  When connecting the adjacent bottom steel plates, usually, as shown in FIG. 9, the bottom steel plates are arranged in a state in which the contact plate 2 is placed over the butt end portions of the adjacent bottom steel plates 1. Bolts (high-strength bolts) 5 are inserted from the lower surface side of the bottom steel plate 1 into the bolt holes 3 and 4 drilled in the overlapping portion of 1 and the attachment plate 2. After that, the washer 7 is fitted to the tip of the bolt 5 protruding above the attachment plate 2 and then the nut 6 is screwed and tightened so that each of the bottoms as the overlapping portion of the steel plates is secured. The overlapping portions of the steel plate 1 and the attachment plate 2 are joined by bolts 5 so that the butt ends of the adjacent bottom steel plates 1 are connected to each other via the attachment plate 2.

  When the overlapping portion of the bottom steel plate 1 and the attachment plate 2 is joined using the bolt 5 as described above, the bolt 5 inserted through the bolt holes 3 and 4 from the lower surface side of the bottom steel plate 1 is dropped. It was necessary to screw and tighten the nut 6 from the upper side of the attachment plate 2 while being held so as not to fall.

  Therefore, as a technique for eliminating the work from the lower surface side of the bottom steel plate at the construction site of the bottom steel plate 1 of the composite floor slab, a bolt 5 inserted from below into the bolt hole 3 of the bottom steel plate 1 is used. It has been considered that the bolt hole 3 is held so as not to fall off through a required jig.

  FIGS. 10A, 10B and 10C show a conventionally proposed hook ring 8 as an example of a jig for holding the bolt 5 in the bolt hole 3 of the bottom steel plate 1 so as not to fall off. .

  The hook ring 8 has a slightly larger outer diameter than the bolt hole 3 formed in the bottom steel plate 1 and has a length dimension (height dimension) in the axial direction of the attachment plate 2. An internal thread portion (not shown) for screwing onto the shaft portion 5a of the bolt 5 is provided on the inner peripheral surface of a ring-shaped member having a dimension smaller than the plate thickness. As a result, as shown in FIG. 10 (a), after the bolts 5 are respectively inserted from below into the bolt holes 3 provided at the butt end portions of the adjacent bottom steel plates 1, the shafts 5a of the respective bolts 5 are inserted into the shaft portions 5a. The hook ring 8 is fitted by screw connection from above, and the hook ring 8 is applied around the bolt hole 3 of each bottom steel plate 1 so that the bolt 5 in the bottom steel plate 1 is bolted in advance. Can be held in a state in which the fall is prevented.

  Therefore, thereafter, as shown in FIG. 10 (b), an attachment plate formed by drilling a bolt hole 4 large enough to allow the hook ring 8 to pass above the butt end of each bottom steel plate 1. 2 is placed from above so that the bolt 5 held in the bolt hole 3 of each bottom steel plate 1 is inserted into the bolt hole 4 from above, and then the bolt 5 as shown in FIG. In addition, by fitting the nut 6 from above through the washer 7 and tightening from above the attachment plate 2, the joining operation of the attachment plate 2 to each bottom steel plate 1, that is, the above-described operation via the attachment plate 2 is performed. The connection work of the bottom steel plates 1 can be performed only from the top side of the bottom steel plate 1 (see, for example, Patent Document 1).

  Further, as shown in FIGS. 11 (a) and 11 (b), a bolt 12 used for joining a bottom steel plate (not shown) is previously held in a hole 10 provided in a haunch plate 9 for constituting a composite floor slab and is prevented from falling off. As the temporary stopper drop-off prevention body 11 for the purpose, the first inner diameter portion 11a provided on one side on which the bolt 12 is inserted and the first inner diameter portion 11a are continuous with the other. An inner diameter is provided with a second inner diameter portion 11b that is inclined toward the center so that the end portion on the side of the bolt 12 has a smaller diameter than the threaded portion of the bolt 12 so as to hold the inserted bolt 12 tightly. And flange-shaped end portions 11c and 11d formed to protrude out of the hole 10 of the haunch plate 9 at both ends on the one side and the other side, and flange-shaped end portions 11c at both ends. And shape in the center of 11d Temporary fixing of a configuration comprising a substantially cylindrical elastic body having an outer shape central portion 11e that is inserted into the hole 10 of the haunch plate 9 and having an outer shape portion that can be held in close contact with the haunch plate 9. Conventional drop-off prevention bodies 11 have been proposed. According to the temporary stopper drop-off prevention body 11, after inserting the temporary stopper drop-off prevention body 11 into the hole 10 of the haunch plate 9 from the other flange-shaped end portion 11 d side, the bolt 12 is connected to one side. Is inserted into the inner diameter portions 11a and 11b, the inner diameter portion 11b inclined to the center is pushed from the inside by the bolt 12, and the other flange-shaped end portion 11d is elastically deformed to one side, It is said that the hunch plate 9 is sandwiched in cooperation with the flange-like end portion 11c on the one side, thereby preventing idle rotation of the bolt 12 (see, for example, Patent Document 2).

  By the way, as a rust prevention treatment on the lower surface side of the bottom steel plate 1 which is the back surface of the composite floor slab as shown in FIG. 9, zinc spraying was originally considered, but in recent years, on the lower surface side of the bottom steel plate 1. In many cases, the entire surface is painted.

  Therefore, in order to make it unnecessary to perform the painting work from the lower surface side of the bottom steel plate 1 at the construction site of the bottom steel plate 1, the applicant assigns a bolt to the bolt hole 3 of the bottom steel plate 1 in a factory or the like. It is considered that the preliminary coating is performed over the entire lower surface of the bottom steel plate 1 including the heads of the bolts 5 with the 5 inserted and held.

JP 2004-176909 A Japanese Patent No. 3976093

  However, as shown in Patent Document 1, using the hook ring 8, the method proposed for holding the bolt 5 in a state in which the bolt 5 is prevented from falling off in advance in the bolt hole 3 of the bottom steel plate 1, as described above. When the nut 6 is fastened to the bolt 5 held in the bolt hole 3 at the construction site of the bottom steel plate 1, there is a possibility that the bolt 5 may rotate together.

  That is, generally, the inner diameter of the bolt hole 3 has a margin with respect to the diameter of the shaft portion 5 a of the bolt 5. For this reason, the hook ring 8 adapted to be fitted to the shaft portion 5a of the bolt 5 by screw connection is only the outer peripheral edge portion of the lower end surface thereof, and the upper end portion of the bolt hole 3 on the upper surface of the bottom steel plate 1. Therefore, the contact area between the lower surface of the hook ring 8 and the upper surface of the bottom steel plate 1 is limited to be small.

  Therefore, when it is difficult to increase the frictional force between the bottom steel plate 1 and the hook ring 8, the nut 6 is screwed onto the bolt 5 held in the bolt hole 3 of the bottom steel plate 1 and tightened. In fact, there is a concern that the bolt 5 may be co-rotated.

  Therefore, after the bolt 5 is held in the bolt hole 3 of the bottom steel plate 1 in the factory or the like in a state in which the bolt 5 is prevented from falling off using the hook ring 8, the bottom steel plate 1 including the head of the bolt 5 is included. Even if pre-coating is performed on the entire lower surface of the bolt, if the rotation of the bolt 6 occurs when the nut 6 is tightened to the bolt 5, the coating film is cracked or peeled off. It has been difficult to perform preliminary coating on the entire lower surface of the bottom steel plate 1.

  Therefore, conventionally, in a factory or the like, prior coating is performed only in the area excluding the peripheral portion of the bolt hole 3 on the lower surface of the bottom steel plate 1. After joining the bottom steel plates 1 to each other by joining the butt end portions of the bottom steel plates 1 using the bolts 5 of the joining plates 2, unpainted portions around the bolt holes 3 on the bottom surface of the bottom steel plates 1. It was necessary to paint the head of the bolt 5.

  Further, in the technique disclosed in Patent Document 1, the bolt 5 is inserted into the bolt hole 3 of the bottom steel plate 1 from below and the head 5b is held, and the shaft of the bolt 5 is placed above the bottom steel plate 1. It is necessary to hang the hook ring 8 on the portion 5a and screw it in. At this time, it is necessary to hold both the head 5b of the bolt 5 and the hook ring 8 so that the head 5b of the bolt 5 and the hook ring 8 do not rotate together. Need to be done at the same time, and manpower is required. Moreover, it is necessary to individually screw the hook ring 8 into the shaft portion 5a of the bolt 5 inserted into each bolt hole 3 at the position of the numerous bolt holes 3 provided in the bottom steel plate 1. Therefore, the fact is that the working efficiency is low.

  According to the technique disclosed in Patent Document 2, the operation of temporarily fixing the bolt 12 to the hole 10 of the haunch plate 9 so as not to drop off is first performed in the hole 10 of the haunch plate 9 with the one of the haunch plate 9. From the side surface (the lower surface side in the figure), the temporary fixing drop-off prevention body 11 is inserted from the other flange-shaped end portion 11d side, and then the temporary fixing drop-off prevention from the same side with respect to the haunch plate 9. Since it can be implemented by inserting the bolts 12 into the inner diameter portions 11a and 11b of the body 11, simultaneous work on both sides of the haunch plate 9 can be made unnecessary.

  However, the temporary fixing drop-off preventing body 11 shown in Patent Document 2 holds the bolt 12 by being in close contact with the outer periphery of the bolt 12 by the elasticity of the temporary fixing drop-out preventing body 11 as an elastic body. Since the bolt 12 is not screwed into the bolt 12, the temporary fastening of the bolt 12 is not based on the tightening axial force, and is thus temporarily secured to the hole 12 of the haunch plate 9. It is not possible to reliably prevent displacement of the bolt 12 in the rotational direction and axial direction.

  Therefore, the technique shown in Patent Document 2 cannot be used as a temporary fixing method of a bolt for carrying out a method of pre-painting the head of the bolt and its surroundings with the bolt temporarily fixed. It is.

  Therefore, in the present invention, when joining overlapping portions of two steel plates using bolts, the bolts can be attached to the bolt holes of one steel plate without requiring simultaneous work on both sides of the one steel plate. The bolt can be held so as not to fall off, and the bolt can be prevented from co-rotating even when the nut is tightened. It is intended to provide a steel plate joining method that can be pre-painted together with the steel plate surface around the head of the bolt, and a bolt temporary fixing nut used in the method.

  In order to solve the above-described problem, the present invention corresponds to claim 1 and includes a bolt hole in one of the two stacked steel sheets to be joined using a bolt. The bolt that is screwed with a bolt temporary fixing nut having a large outer diameter is pushed in from one side of one steel plate together with the bolt temporary fixing nut, and the bolt temporary fixing nut is fixed to this bolt hole. Then, the bolt is tightened against a bolt temporary fixing nut fixed inside the bolt hole, and the bolt is temporarily fixed to the one steel plate in advance. By placing the other steel plate with a bolt hole larger than the outer diameter of the bolt temporary fixing nut on the side surface, and screwing the nut onto the bolt from the outside, and tightening the two sheets, Laminated steel sheet The steel plate bonding method for engagement.

  Further, in accordance with claim 2, a temporary bolt that has a required outer diameter larger than that of the bolt hole is provided in the bolt hole of one of the two stacked steel plates to be joined using a bolt. The bolt on which the fixing nut is screwed is pushed together with the bolt temporary fixing nut from one side surface of one of the steel plates, and the bolt temporary fixing nut is fixed to the bolt hole. A region including the head of the bolt on one side of the one steel plate, the bolt is tightened in advance with respect to the bolt temporary fixing nut to be fixed, and the bolt is temporarily fixed to the one steel plate in advance. Then, the other steel plate having a bolt hole larger than the outer diameter of the bolt temporary fixing nut is arranged on the other side of the one steel plate, and the nut is attached to the bolt from the outside. Screw and tighten By kicking it, and the steel sheet joining method of joining the two superimposed steel plates.

  Further, in accordance with claim 3, a bolt hole of one of the two stacked steel plates to be joined using a bolt has a lock having a required outer diameter larger than the bolt hole. A bolt that is screwed with a bolt temporary fixing nut having a protruding portion for use is connected to the bolt temporary fixing nut, and a locking protruding portion of the bolt temporary fixing nut is provided from one side of one steel plate. Press until it passes through the bolt hole of the one steel plate and comes out to the other side, and then locked to the outer peripheral edge of the bolt hole on the other side of the one steel plate by the locking projection. The bolt is fastened to the one steel plate in advance by tightening the bolt with respect to the bolt temporary fixing nut, and then the other side of the one steel plate is used to lock the bolt temporary fixing nut. Drill a bolt hole larger than the outer diameter of the protrusion. To place the other steel plate, by tightening by screwing the nut from the outside to the bolt, the steel sheet joining method of joining the two superimposed steel plates.

  Further, in accordance with claim 4, the bolt hole of one of the two stacked steel plates to be joined using bolts has an outer diameter larger than the bolt hole by a required dimension. A bolt which is screwed with a bolt temporary fixing nut having a locking protrusion, and together with the bolt temporary fixing nut, a locking protrusion of the bolt temporary fixing nut from one side of one steel plate. Is pushed in until it passes through the bolt hole of the one steel plate and comes out to the other side surface, and then locked to the outer peripheral edge portion of the bolt hole on the other side surface of the one steel plate by the locking projection. The bolt is tightened against the bolt temporary fixing nut, the bolt is temporarily fixed to the one steel plate in advance, and then the region including the head of the bolt on one side of the one steel plate is preceded. After painting and then one steel above On the other side surface, the other steel plate having a bolt hole larger than the outer diameter of the locking projection of the bolt temporary fixing nut is disposed, and the nut is screwed onto the bolt from the outside and tightened. Thus, a steel plate joining method for joining the two superposed steel plates is adopted.

  Corresponding to claim 5, a bolt temporarily fixed to temporarily fix a bolt, which is passed through a bolt hole of one of the two stacked steel plates to be joined using a bolt, to the one steel plate. The nut has a cylindrical shape having an outer diameter that is larger than the bolt hole of the one steel plate, and has an internal thread portion that is screwed onto the shaft portion of the bolt on the inner peripheral surface. By being pushed into the bolt hole of the one steel plate while being screwed to the shaft portion, it can be fixed in the bolt hole by the restoring force of elastic deformation compressed in the radial direction at the gap between the bolt hole and the bolt. A bolt temporary fixing nut having the structure as described above.

  Further, in the bolt temporary fixing nut having the above-described configuration, ring-shaped grooves are provided at a plurality of positions in the axial center direction on the outer peripheral surface.

  Corresponding to claim 7, a bolt temporarily fixed to temporarily fix a bolt passed through a bolt hole of one steel plate of two superposed steel plates to be joined using a bolt to the one steel plate. In the nut, the outer diameter of one end portion in the axial direction is made smaller than the bolt hole of the one steel plate, and at the intermediate portion in the axial direction, the outer diameter is larger than the bolt hole of the one steel plate and It has a locking projection that can be elastically deformed to the shaft center side, and has an internal thread portion that is screwed to the shaft portion of the bolt on the inner peripheral surface, and is screwed to the shaft portion of the bolt. The locking protrusion protrudes into the bolt hole by pushing into the bolt hole of the one steel plate from one side until the locking protrusion passes through the bolt hole of the one steel plate and comes out to the other side. Bolts having a structure that can be locked and fixed And nut.

  In the bolt temporary fixing nut having the above-described configuration, a cylinder having the same diameter as or slightly larger than the bolt hole of one of the two stacked steel plates on the other end side in the axial direction from the locking projection. It is set as the structure which provided the part.

According to the present invention, the following excellent effects are exhibited.
(1) A bolt temporary fixing nut having an outer diameter larger than that of the bolt hole is screwed into a bolt hole of one of the two stacked steel plates to be joined using a bolt. The bolt is pushed together with the bolt temporary fixing nut from one side surface of one steel plate, the bolt temporary fixing nut is fixed to the bolt hole, and then the bolt temporary fixing nut fixed to the inside of the bolt hole. The bolt is tightened against the steel plate, and the bolt is temporarily fixed to the one steel plate in advance, and then a bolt hole larger than the outer diameter of the bolt temporary fixing nut is formed on the other side surface of the one steel plate. A steel plate joining method for joining the two superposed steel plates, or by using bolts, by arranging the other steel plate with the holes drilled and screwing and tightening nuts to the bolts from the outside. A bolt temporary fixing nut having a locking projection having an outer diameter larger than the bolt hole is screwed into a bolt hole of one of the two stacked steel plates. The bolt is fixed together with the bolt temporary fixing nut so that the locking projection of the bolt temporary fixing nut passes through the bolt hole of the one steel plate and exits to the other side from one side of the one steel plate. And then tightening the bolt against a bolt temporary fixing nut that is locked to the outer peripheral edge of the bolt hole on the other side of the one steel plate by the locking protrusion. Is temporarily fixed to the one steel plate, and then the other steel plate in which a bolt hole larger than the outer diameter of the locking projection of the bolt temporary fixing nut is formed on the other side of the one steel plate. Place the above-mentioned bolt from the outside Since the steel plate joining method is to join the two superposed steel plates by screwing the nuts into the bolts, the operation of screwing the bolt temporary fixing nuts to the bolts is performed in the bolt holes of the one steel plate. It can be carried out at a place different from the work site for temporarily fixing. Therefore, the work efficiency of the work of screwing the bolt temporary fixing nut onto the bolt can be increased. Further, when the bolt is temporarily fixed to the bolt hole of the one steel plate, the simultaneous operation on both sides of the one steel plate can be eliminated. As a result, it is possible to expect the effect of reducing labor and manpower.
(2) The bolt can be temporarily fixed to the bolt hole of the one steel plate in a state in which rotation is prevented by a large tightening axial force against the bolt temporary fixing nut. Therefore, the joining operation of the other steel plate to the one steel plate can be performed only by the operation from the other side surface of the one steel plate in which the bolt is temporarily fixed to the bolt hole. In addition, when a nut is screwed and tightened to a bolt that is temporarily fixed to the bolt hole of the one steel plate, it is possible to prevent a possibility that the bolt will rotate together.
(3) In the steel plate joining method according to (1), after a bolt is temporarily fixed to one steel plate, a region including the head portion of the bolt on one side surface of the one steel plate is pre-painted, and then the one side By joining the other steel plate to the other side surface of the steel plate, it is possible to prevent the occurrence of cracking or peeling in the preceding coating applied to the one side surface of the one steel plate, Only the work from the other side of the steel sheet can be performed to join the other steel sheet to the one steel sheet.
(4) In the bolt temporary fixing nut for temporarily fixing the bolt passed through the bolt hole of one of the two stacked steel plates to be joined using the bolt to the one steel plate, the one steel plate A cylindrical shape having an outer diameter larger than that of the bolt hole and having a female screw portion for screwing onto the bolt shaft portion on the inner peripheral surface and screwed to the bolt shaft portion. By pressing the bolt into the bolt hole of one of the steel plates, a temporary bolt is constructed that can be fixed in the bolt hole by a restoring force of elastic deformation compressed in the radial direction at the gap between the bolt hole and the bolt. By using the fixing nut, the bolt formed by screwing the bolt temporary fixing nut is pushed into the bolt hole from one side of the one steel plate, and the bolt is dropped into the bolt hole of the one steel plate. The bolt can be temporarily fixed to the bolt hole of the one steel plate in a state in which the bolt is prevented from rotating by tightening the bolt with respect to the bolt temporary fixing nut. Tightening of the bolt to the bolt temporary fixing nut can be performed from the side surface of either one of the above steel plates, and, as described above, both the surfaces of the one steel plate can be used for temporarily fixing the bolt to the bolt hole of the one steel plate. Bolt temporary fixing nut that can exhibit the effect of eliminating the need for simultaneous work on the side can be realized.
(5) By adopting a structure in which ring-shaped grooves are provided at a plurality of locations in the axial center required interval on the outer peripheral surface, the bolt shaft of one steel plate is screwed onto the bolt shaft from one side. When the bolt temporary fixing nut is pushed in, the hook-shaped protrusion formed between adjacent grooves on the outer peripheral surface of the bolt temporary fixing nut is elastically deformed so as to be turned to one side of the one steel plate. After that, when tightening the bolt with respect to the bolt temporary fixing nut, the direction in which the bolt-shaped protrusions on the outer peripheral surface of the bolt temporary fixing nut are turned when being pushed into the bolt hole Therefore, the bolt temporary fixing nut can be reliably fixed to the inside of the bolt hole.
(6) In a bolt temporary fixing nut for temporarily fixing a bolt, which is passed through a bolt hole of one of the two stacked steel plates to be joined using a bolt, to the one steel plate, in the axial direction The outer diameter of one end is smaller than the bolt hole of the one steel plate, and the diameter is larger than the bolt hole of the one steel plate and can be elastically deformed in the axial direction in the middle portion in the axial direction. Provided with a locking projection and an internal thread portion on the inner peripheral surface for screwing onto the shaft portion of the bolt, and the bolt hole of the one steel plate in a state of being screwed onto the shaft portion of the bolt. The locking projection is locked to the bolt hole by pressing the locking projection from one side until it passes through the bolt hole of the one steel plate and comes to the other side. Bolt temporary fixing nut having a configuration that can be made Then, by inserting a bolt temporary fixing nut screwed into the bolt shaft portion from one side surface into the bolt hole of one steel plate until the locking protruding portion comes out to the other side surface, The bolt hole can be held so as not to fall, and further, the bolt is prevented from rotating in the bolt hole of the one steel sheet by tightening the bolt against the bolt temporary fixing nut. It is possible to realize a bolt temporary fixing nut capable of exhibiting the effect that it can be temporarily fixed with the.
(7) A cylindrical portion having the same diameter as or slightly larger than the bolt hole of one of the two stacked steel plates is provided on the other end side in the axial direction from the locking projection. By adopting a configuration, a bolt temporary fixing nut screwed to the shaft portion of the bolt is pushed into the bolt hole of one steel plate from one side surface, and the locking protrusion is connected to the other side of the bolt. In such a state that the bolts are arranged so as to come out, free rotation of the bolt temporary fixing nuts can be prevented. Therefore, since the bolt can be tightened with respect to the bolt temporary fixing nut from the side surface of one of the one steel plates, the work of temporarily fixing the bolt to the bolt hole of one steel plate Simultaneous work on both sides can be eliminated.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIGS. 1 (a), (b), (c) to FIG. 3 show an embodiment of a steel plate joining method of the present invention and a bolt temporary fixing nut used in the method as two superposed steel plates. The case where it is applied to the joint portion between the bottom steel plate 1 and the splicing plate 2 of the same composite floor slab as shown is as follows.

  That is, the bolt temporary fixing nut 13 of the present invention has an inner diameter of the bolt hole 3 of the bottom steel plate 1 to which the bolt 5 used for joining the bottom steel plate 1 and the attachment plate 2 is to be temporarily fixed as shown in FIG. As a cylindrical shape having a larger outer diameter than a required dimension, a female thread portion 14 for screwing the shaft portion 5a of the bolt 5 on the inner peripheral surface is provided. Specifically, the bolt temporary fixing nut 13 has an outer diameter set to a size that is, for example, about 0.5 mm larger than the inner diameter of the bolt hole 3 of the bottom steel plate 1. When the inner diameter of the bolt hole 3 of the bottom steel plate 1 is 25 mm, the outer diameter of the temporary bolt fixing nut 13 is set to about 25.5 mm.

  Further, on the outer peripheral surface of the bolt temporary fixing nut 13, a ring-shaped groove 15 is provided at a required interval position in the axial center direction, and the inner diameter of the groove 15 is required to be larger than the inner diameter of the bolt hole 3 of the bottom steel plate 1. A plurality of protrusions 16 having a depth such that the size is reduced are formed between the adjacent grooves 15.

  The female screw portion 14 of the bolt temporary fixing nut 13 has a region where no screw is engraved in the lower neck portion in the vicinity of the head 5b of the bolt 5, or an incomplete screw thread in the lower neck portion. Even if the bolt is present, the bolt temporary fixing nut 13 to be screwed to the shaft portion 5a of the bolt 5 is required at one end in the axial direction near the bolt head portion 5b than the head portion 5b of the bolt 5. It is provided so that it can be screwed to a position separated by a gap of dimensions, for example, a position separated by about 2 to 3 mm.

  The dimension of the bolt temporary fixing nut 13 in the axial direction ensures a sufficient tightening axial force for temporarily fixing the bolt 5 as will be described later, at least in the axial direction of the internal thread portion 14 on the inner peripheral surface. It is set so that the necessary number of threads can be arranged. Further, in the state where the bolt temporary fixing nut 13 is screwed into the shaft portion 5a of the bolt 5 to a position away from the head portion 5b as described above, the shaft on the side opposite to the bolt head 5b in the bolt temporary fixing nut 13 is provided. It is assumed that the distance from the bolt head 5b at the other end in the central direction is set to a dimension equal to or smaller than the sum of the thickness of the bottom steel plate 1 and the thickness of the attachment plate 2. When using the washer 7 having an inner diameter larger than the outer diameter of the bolt temporary fixing nut 13 as the washer 7 fitted to the bolt 5 when the bottom steel plate 1 and the attachment plate 2 are joined, The bolt head at the other end in the axial direction of the bolt temporary fixing nut 13 with the bolt temporary fixing nut 13 screwed into the shaft 5a of the bolt 5 to a position separated from the head 5b by a predetermined dimension as described above. The axial center dimension of the bolt temporary fixing nut 13 is set so that the distance from 5b is equal to or less than the sum of the thickness of the bottom steel plate 1, the thickness of the attachment plate 2 and the thickness of the washer 7. That's fine.

  Furthermore, the bolt temporary fixing nut 13 is made of, for example, a synthetic resin or a soft metal compared to the bottom steel plate 1 and the bolt 5 such as brass, copper, or aluminum so as to allow a required elastic deformation. As made. Thus, the bolt temporary fixing nut 13 is screwed into the bolt hole 3 of the bottom steel plate 1 together with the bolt 5 in a state where the bolt temporary fixing nut 13 is screwed into a predetermined position in the shaft portion 5a of the bolt 5 as described above. The temporary fixing nut 13 can be forcibly pushed in, and the radial direction generated in the portion of the bolt temporary fixing nut 13 forcedly pushed into the gap between the bolt hole 3 and the bolt 5 of the bottom steel plate 1. The outer peripheral surface of the bolt temporary fixing nut 13 is brought into close contact with the inner peripheral surface of the bolt hole 3 of the bottom steel plate 1 by the restoring force of the compression elastic deformation of the bolt, and the bolt temporary fixing nut 13 is placed inside the bolt hole 3. Can be fixed.

  A taper portion 17 having a chamfered corner is provided on the outer peripheral portion of the other axial end portion of the bolt temporary fixing nut 13 so that the outer diameter of the other axial end portion of the bottom steel plate 1 is reduced. It is thinner than the inner diameter of the bolt hole 3. Thereby, workability | operativity when pushing the bolt temporary fixing nut 13 into the bolt hole 3 of the said bottom steel plate 1 together with this volt | bolt 5 in the state attached to the axial part 5a of the volt | bolt 5 as mentioned above can be improved. It is like that.

  By using the bolt temporary fixing nut 13 having the above-described configuration, the bottom steel plate 1 and the splicing plate 2 of the composite floor slab as two superposed steel plates are joined, and the adjacent bottom steel plates are similar to those shown in FIG. In the case of connecting the butt end portions 1 through the attachment plate 2, first, bolts used for joining the bottom steel plate 1 and the attachment plate 2 as shown in FIG. 5. For example, the bolt temporary fixing nut 13 is screwed onto a shaft portion 5a of a Torcia-type bolt (high-strength bolt) 5, and one end in the axial direction of the bolt temporary fixing nut 13 near the bolt head 5b. And the bolt head 5b is screwed to a position where the distance is about 2 to 3 mm.

  Next, as shown in FIG. 1 (b), the bolt head 5b is connected to the bolt hole 3 of the bottom steel plate 1 together with the bolt temporary fixing nut 13 in which the bolt 5 is screwed in advance from below. Forcibly push down to the position where it touches the bottom surface of the bottom steel plate 1. As a result, the outer peripheral surface of the bolt temporary fixing nut 13 is deformed by the restoring force of the bolt temporary fixing nut 13 that is compressed and elastically deformed in the radial direction between the bolt 5 and the bolt hole 3 of the bottom steel plate 1. The bolt temporary fixing nut 13 is fixed inside the bolt hole 3 by being brought into close contact with the inner peripheral surface of the bolt hole 3 of the steel plate 1. Therefore, the bolt 5 screwed to the bolt temporary fixing nut 13 fixed to the bolt hole 3 of the bottom steel plate 1 is held without falling in a state of being inserted into the bolt hole 3 of the bottom steel plate 1. It becomes like this.

  Next, the bolt 5 is rotated in the tightening direction. Specifically, on the upper side of the bottom steel plate 1, the tip of the Torcia bolt 5 inserted through the bolt hole 3 from below is used to tighten the bolt 5 using a general-purpose box wrench or the like. The bolt 5 is tightened against the bolt temporary fixing nut 13 fixed inside the bolt hole 3 of the bottom steel plate 1. When the bolt 5 is a normal hexagon bolt (high-strength bolt), the head of the bolt 5 may be rotated in the tightening direction by work from the bottom side of the bottom steel plate 1. .

  The behavior of the bolt temporary fixing nut 13 in the process of FIG. 1B will be described in detail. First, when the bolt temporary fixing nut 13 is screwed into the bolt 5 and is pushed into the bolt hole 3 of the bottom steel plate 1. As shown in FIG. 2 (a), the female threaded portion 14 on the inner circumferential surface is pushed upward by the shaft portion 5a of the bolt 5 screwed to the female threaded portion 14, while the outer circumferential surface of the bolt temporary fixing nut 13 And the inner peripheral surface of the bolt hole 3 of the bottom steel plate 1, friction acts, so that each flange-shaped protrusion 16 provided on the outer peripheral surface of the bolt temporary fixing nut 13 turns the outer peripheral portion downward ( It is deformed to tilt). Thereafter, when the bolt 5 is tightened with respect to the bolt temporary fixing nut 13, the head 5b abuts against the lower surface of the bottom steel plate 1 to prevent upward displacement as shown in FIG. Since a downward force acts on the internal thread portion 14 of the inner peripheral surface of the bolt temporary fixing nut 13 by the shaft portion of the bolt 5 that is applied, each hook-shaped protrusion on the outer peripheral surface of the bolt temporary fixing nut 13 A compressive force is applied to the portion 16 along the direction of turning (inclined direction) when the bolt 16 is pushed into the bolt hole 3. For this reason, each bolt-shaped protrusion of the bolt temporary fixing nut 13 is applied. The adhesion of the outer peripheral surface of the portion 16 to the inner peripheral surface of the bolt hole 3 is increased, and the bolt temporary fixing nut 13 is more reliably fixed to the inner side of the bolt hole 3. Therefore, the bolt 5 is temporarily fixed to the bolt hole 3 of the bottom steel plate 1 in a state in which the rotation is prevented by the strong tightening axial force generated by tightening the bolt temporary fixing nut 13. Become.

  After the bolt 5 is temporarily fixed as described above, the bolt temporary fixing nut 13 is inserted into the bolt hole 3 at a factory or the like as shown by a two-dot chain line in FIG. On the lower surface side of the bottom steel plate 1 to which the bolts 5 are temporarily fixed via the above, the preceding coating is applied over the entire surface including the heads 5b of the bolts 5. Reference numeral 18 denotes a coating film.

  After that, the bottom steel plate 1 having the bolt 5 temporarily fixed in the bolt hole 3 and the preceding coating on the lower surface side is carried into the construction site, and the bottom steel plate 1 is arranged in the span direction on the main girder. After installation, as shown in FIG. 1 (c) (only one bottom steel plate 1 is shown in FIG. 1 (c)) above the butt ends of adjacent bottom steel plates 1, each bottom steel plate 1 is shown. The attachment plate 2 formed by drilling a bolt hole 4 having a required dimension larger than the outer diameter of the bolt temporary fixing nut 13 at a position corresponding to the bolt hole 3 is mounted from above. Bolts 5 temporarily fixed to the bolt holes 3 of the bottom steel plate 1 are inserted into the bolt holes 4 respectively.

  Thereafter, a nut 6 is fitted to the shaft portion 5a of each bolt 5 protruding upward from the attachment plate 2 via a washer 7, and the nut 6 is tightened with respect to the bolt 5 to thereby The overlapping portions of the bottom steel plate 1 and the attachment plate 2 are joined by bolts 5 respectively.

  In general, when the male screw and the female screw are screwed together, some play is provided between the screw thread and the screw groove. Therefore, even if the shaft portion of the bolt 5 is slightly extended when the nut 6 is tightened with respect to the bolt 5, the thread of the shaft portion 5 a of the bolt 5 is formed on the bottom steel plate 1 as shown in FIG. Since the displacement is made inside the play of the thread groove of the female thread portion 14 of the bolt temporary fixing nut 13 fixed inside the bolt hole 3, the elongation of the bolt 5 is not restricted at all. Thereby, the joining of the bottom steel plate 1 and the contact plate 2 by the bolt 5 and the nut 6 is surely performed by a predetermined tightening axial force. Therefore, the butt end portions of the adjacent bottom steel plates 1 are connected to each other via the splicing plate 2.

  Thus, according to the steel plate joining method of the present invention, the screwing operation of the bolt temporary fixing nut 13 with respect to the bolt 5 can be performed at a place different from the site where the bolt 5 is temporarily fixed with respect to the bottom steel plate 1. The working efficiency of the screwing operation of the bolt temporary fixing nut 13 with respect to the bolt 5 can be increased.

  Further, the bolt 5 into which the bolt temporary fixing nut 13 is screwed is pushed together with the bolt temporary fixing nut 13 into the bolt hole 3 of the bottom steel plate 1 so that the bolt 5 is bottomed through the bolt temporary fixing nut 13. It can hold | maintain so that it may not fall to the bolt hole 3 of the steel plate 1. FIG. Further, the bolt 5 is tightened into the bolt temporary fixing nut 13 fixed to the bolt hole 3 of the bottom steel plate 1 when the bolt 5 is a Torcia type, and when the bolt 5 is a hexagonal bolt, the head is fixed. It is only necessary to rotate the part in the tightening direction of the bolt 5. Therefore, simultaneous work on both the upper and lower sides of the bottom steel plate 1 becomes unnecessary, and labor and manpower can be reduced.

  Further, the bolt 5 is temporarily inserted into the bolt hole 3 of the bottom steel plate 1 in a state where the bolt 5 is prevented from rotating by a large tightening axial force against the bolt temporary fixing nut 13 fixed inside the bolt hole 3 of the bottom steel plate 1. Can be fixed.

  Therefore, when the nut 6 is tightened from the upper side of the attachment plate 2 to the bolt 5 temporarily fixed to the bolt hole 3 of the bottom steel plate 1 at the construction site of the bottom steel plate 1, The possibility of co-rotation can be prevented beforehand. For this reason, as described above, since it becomes possible to perform a pre-painting including the head portion 5b of the bolt 5 attached to the bolt hole 3 on the lower surface side of the bottom steel plate 1 at a factory or the like, The painting work from the lower surface side of the bottom steel plate 1 after the installation of the bottom steel plate 1 can be made unnecessary, and a work requiring a scaffold under the bottom steel plate 1 or using an aerial work vehicle It is possible to eliminate the work to be performed.

  Next, FIG. 4 shows another example of the bolt temporary fixing nut as another embodiment of the present invention. In the same configuration as the bolt temporary fixing nut 13 shown in FIG. Are omitted, and the outer peripheral surface is a bolt temporary fixing nut 13a which is a flat cylindrical surface in the axial direction.

  In the bolt temporary fixing nut 13a according to the present embodiment having the above-described configuration, the bolt 5 is forcibly pushed into the bolt hole 3 of the bottom steel plate 1 together with the bolt 5 in a state of being screwed into the shaft portion 5a of the bolt 5. In this case, there is no portion that can be bent and deformed like the hook-shaped protrusion 16 in the bolt temporary fixing nut 13 shown in FIG. Therefore, the bolt temporary fixing nut 13a of the present embodiment has an outer diameter that is larger than the inner diameter of the bolt hole 3 of the bottom steel plate 1 and is outside the bolt temporary fixing nut 13 shown in FIG. It is set to be slightly smaller than the diameter dimension, or the material of the bolt temporary fixing nut 13a is made to be a material whose allowance for elastic deformation is slightly larger than that of the bolt temporary fixing nut 13 shown in FIG. do it.

  Other configurations are the same as those shown in FIG. 3, and the same components are denoted by the same reference numerals.

  Also with the bolt temporary fixing nut 13a of the present embodiment having the above configuration, the bolt is fixed by being pushed into the bolt hole 3 of the bottom steel plate 1 by the same procedure as shown in FIGS. The bolt 5 is temporarily fixed to the bolt hole 3 of the bottom steel plate 1 through the bolt temporary fixing nut 13a, and the subsequent joining of the bottom steel plate 1 and the attachment plate 2 with the bolt 5 and the nut 6 can be performed.

Therefore, the present embodiment can provide the same effects as those of the above embodiment.
Moreover, since the bolt temporary fixing nut 13a can be made into a simple structure, the effect of reducing the manufacturing cost of the bolt temporary fixing nut 13a can be expected.

  Next, FIGS. 5 (a), (b), (c) and FIG. 6 show still another embodiment of the present invention, which is as follows.

  That is, the bolt temporary fixing nut 19 in the present embodiment has a bolt 5 on the inner peripheral surface of a cylindrical member 20 having an outer diameter smaller than the inner diameter of the bolt hole 3 of the bottom steel plate 1 as shown in FIG. A female screw portion 14 is provided for screwing onto the shaft portion 5a.

  The central portion of the outer peripheral surface of the cylindrical member 20 in the axial direction is in the axial direction that is closer to the bolt head 5b from one of the axial directions that are closer to the tip of the shaft 5a when screwed into the bolt shaft 5a. A taper-like locking projection 21 having a diameter larger than the inner diameter of the bolt hole 3 of the bottom steel plate 1 is gradually increased toward the other end of the steel plate. Provide.

  Further, on the other end side in the axial direction of the locking projection 21, a cylindrical portion 22 having the same diameter as the inner diameter of the bolt hole 3 of the bottom steel plate 1 or a slightly larger outer diameter is provided. The cylindrical member 20 is attached so as to extend to the other axial end side of the cylindrical member 20 so as to have a required dimension, and between the other axial end portion of the locking projection 21 and the cylindrical portion 22, Alternatively, a slightly tapered step portion 23 is provided. In addition, a required width in the radial direction is provided between the taper-shaped locking projection 21 near the other end in the axial direction and between the inner peripheral surface of the cylindrical portion 22 and the outer peripheral surface of the cylindrical member 20. The space 22a is provided so as to allow elastic deformation of the locking projection 21 toward the other axial end and the cylindrical portion 22 toward the axial center.

  The axial dimension of the bolt temporary fixing nut 19 is set so that the length dimension from the stepped portion 23 to one axial end of the cylindrical member 20 is equal to or less than the thickness of the attachment plate 2. It shall be. A washer 7 having an inner diameter larger than the outer diameter of the cylindrical member 20 of the bolt temporary fixing nut 19 is used as the washer 7 fitted to the bolt 5 when the bottom steel plate 1 and the attachment plate 2 are joined. In this case, the length from the step 23 of the bolt temporary fixing nut 19 to one end in the axial direction of the cylindrical member 20 is not more than the sum of the thickness of the attachment plate 2 and the thickness of the washer 7. It should be set as follows.

  The material of the bolt temporary fixing nut 19 is the same as that of the bolt temporary fixing nut 13 in the embodiment shown in FIGS.

  5 (a), (b), (c) and FIG. 6, the same components as those shown in FIGS. 1 (a), (b), (c) to FIG. 3 are denoted by the same reference numerals.

  Using the bolt temporary fixing nut 19 having the above-described configuration, the bottom steel plate 1 and the splicing plate 2 of the composite floor slab as two superposed steel plates are joined, and the butt ends of the adjacent bottom steel plates 1 are joined together. When connecting via the attachment plate 2, the bolt (high strength bolt) 5 used for joining the bottom steel plate 1 and the attachment plate 2 as shown in FIG. The bolt temporary fixing nut 19 is screwed onto the shaft portion 5a, and is screwed until the cylindrical portion 22 is disposed at a position separated from the bolt head portion 5b by the thickness of the bottom steel plate 1. To do.

  Next, as shown in FIG. 5 (b), the bolt 5 is screwed from below into the bolt hole 3 of the bottom steel plate 1 together with the bolt temporary fixing nut 19 previously screwed together with the head 5b of the bolt 5. Is pushed to a position where it touches the lower surface of the bottom steel plate 1. Thereby, the bolt temporary fixing nut 19 is pushed to a position where the cylindrical portion 20 is arranged inside the upper end of the bolt hole 3 of the bottom steel plate 1, and at this time, the bolt 20 is pushed into the bolt hole 3 of the bottom steel plate 1. When the tapered protruding protrusion 21 that has been elastically deformed to the axial center once passes through the bolt hole 3 of the bottom steel plate 1, it is radially outside above the bottom steel plate 1. The shape will be restored to open in the direction. Therefore, the stepped portion 23 provided between the locking projection 21 and the cylindrical portion 22 disposed inside the bolt hole 3 of the bottom steel plate 1 is the bolt hole 3 on the upper surface of the bottom steel plate 1. The bolt 5 that is screwed to the bolt temporary fixing nut 19 is held without being dropped while being inserted into the bolt hole 3 of the bottom steel plate 1. Become so. At this time, since the outer peripheral surface of the cylindrical portion 22 of the bolt temporary fixing nut 19 is in contact with the inner peripheral surface of the bolt hole 3 of the bottom steel plate 1, free rotation of the bolt temporary fixing nut 19 is also restricted. .

  Next, when the bolt 5 is rotated in the tightening direction, the free rotation is limited and the bolt on the upper surface of the bottom steel plate 1 is provided by the step portion 23 provided on the other axial end side of the locking projection 21. The bolt 5 is tightened with respect to the bolt temporary fixing nut 19 locked to the peripheral edge of the hole 3. Thereby, the bolt 5 is temporarily fixed to the bolt hole 3 of the bottom steel plate 1 in a state where rotation is prevented by a strong tightening axial force generated with respect to the bolt temporary fixing nut 19.

  After temporarily fixing the bolt 5 to the bolt hole 3 of the bottom steel plate 1 as described above, according to the same procedure as shown in FIGS. As shown by a two-dot chain line in FIG. 5 (b), the head 5b of the bolt 5 is provided on the lower surface side of the bottom steel plate 1 in which the bolt 5 is temporarily fixed to the bolt hole 3 via the bolt temporary fixing nut 19. After the preliminary coating is performed over the entire surface including the bottom steel plate 1, the bottom steel plate 1 is carried into the construction site, and the bottom steel plate 1 is arranged in the span direction on the main girder. Thereafter, as shown in FIG. 5 (c), the attachment plate 2 formed with a bolt hole 4 having a required dimension larger than the outer diameter of the locking projection 21 of the bolt temporary fixing nut 19 is placed from above. Then, after the bolt 5 temporarily fixed to the bolt hole 3 of the bottom steel plate 1 is inserted into the bolt hole 4 of the attachment plate 2, the washer 7 is attached to the shaft portion 5 a of the bolt 5. By tightening the nut 6 after fitting, the overlapping portions of the bottom steel plate 1 and the joining plate 2 are joined by the bolts 5, and the butt end portions of the adjacent bottom steel plates 1 are joined to each other by the joining plate. 2 is connected.

  Also in this embodiment, the same effects as those of the embodiment shown in FIGS. 1 (a), (b), (c) to FIG. 3 can be obtained.

  FIGS. 7 (a), (b), (c) and FIG. 8 show still another embodiment of the present invention, which is as follows.

  That is, the bolt temporary fixing nut 24 in the present embodiment has a bolt 5 on the inner peripheral surface of a cylindrical member 25 having an outer diameter smaller than the inner diameter of the bolt hole 3 of the bottom steel plate 1 as shown in FIG. A female screw portion 14 is provided for screwing onto the shaft portion 5a.

  One end side of the cylindrical member 25 in the axial direction has a cross-sectional chevron-shaped ring shape bent outward in the radial direction at an intermediate portion in the axial direction, and the outer diameter of the top is the bottom steel plate 1. A locking projection 26 that is larger than the inner diameter of the bolt hole 3 by a required dimension is integrally attached.

  Further, on one end side in the axial direction of the locking projection 26, a cylindrical portion having the same diameter as the inner diameter of the bolt hole 3 of the bottom steel plate 1 or a slightly larger outer diameter and extending the required dimension in the axial direction. 27 is attached integrally.

  The axial center dimension of the bolt temporary fixing nut 24 is such that the bolt temporary fixing nut 24 that is locked to the peripheral edge portion of the bolt hole 3 on the upper surface of the bottom steel plate 1 by the locking projection 26 as described later. On the other hand, when the bolt 5 is tightened from the lower surface side of the bottom steel plate 1, the protruding amount from the upper surface of the bottom steel plate 1 at the other axial end of the cylindrical member 25 is the plate of the attachment plate 2. It is set to be less than the thickness dimension. A washer 7 having an inner diameter larger than the outer diameter of the cylindrical member 25 of the bolt temporary fixing nut 24 is used as the washer 7 fitted to the bolt 5 when the bottom steel plate 1 and the attachment plate 2 are joined. In this case, the protruding amount from the upper surface of the bottom steel plate 1 at the other axial end of the cylindrical member 25 in the state where the bolt 5 is tightened is the thickness of the attachment plate 2 and the thickness of the washer 7. It may be set so that the dimension is less than or equal to the sum of.

  The material of the bolt temporary fixing nut 24 is the same as that of the bolt temporary fixing nut 13 in the embodiment shown in FIGS.

  7 (a), (b), (c) and FIG. 8, the same components as those shown in FIGS. 1 (a), (b), (c) and FIG.

  Using the bolt temporary fixing nut 24 having the above-described configuration, the bottom steel plate 1 and the splicing plate 2 of the composite floor slab as two superposed steel plates are joined, and the butt end portions of the adjacent bottom steel plates 1 are joined together. When connecting via the attachment plate 2, first, at a factory or the like, as shown in FIG. 7A, the shaft portion 5 a of the bolt 5 used for joining the bottom steel plate 1 and the attachment plate 2, The bolt temporary fixing nut 24 is screwed from one end side in the axial direction, and is screwed until the cylindrical portion 27 is arranged at a position separated from the bolt head portion 5b by the thickness of the bottom steel plate 1. To.

  Next, as shown in FIG. 7 (b), the bolt 5 is screwed from below into the bolt hole 3 of the bottom steel plate 1 together with the bolt temporary fixing nut 24 that has been screwed in advance. Is pushed to a position where it touches the lower surface of the bottom steel plate 1. Thereby, the said bolt temporary fixing nut 24 is pushed in to the position where the said cylindrical part 27 is distribute | arranged inside the upper end part of the bolt hole 3 of the bottom steel plate 1. FIG. At this time, after being pushed into the bolt hole 3 of the bottom steel plate 1, the locking projection 26 as the cross-sectional shape chevron is once elastically deformed so as to be crushed to the axial side, and then the bottom steel plate. When passing through one bolt hole 3, the shape of the locking protrusion 26 that has been elastically deformed is restored to protrude radially outward above the bottom steel plate 1. . Therefore, since this locking protrusion 26 is locked to the peripheral edge of the bolt hole 3 on the upper surface of the bottom steel plate 1, the bolt 5 screwed to the bolt temporary fixing nut 24 is And it comes to hold | maintain without falling in the state penetrated by the bolt hole 3 of the bottom steel plate 1. FIG. At this time, since the outer peripheral surface of the cylindrical portion 27 of the bolt temporary fixing nut 24 is in contact with the inner peripheral surface of the bolt hole 3 of the bottom steel plate 1, free rotation of the bolt temporary fixing nut 24 is also restricted.

  Next, when the bolt 5 is rotated in the tightening direction, the free rotation is restricted, and the bolt provisional portion that is locked to the peripheral edge portion of the bolt hole 3 on the upper surface of the bottom steel plate 1 by the locking protrusion 26 is provided. The bolt 5 is fastened to the fixing nut 24, and the temporary locking bolt 26 is fixed by the biting of the locking protrusion 26 into the gap between the bolt hole 3 and the bolt 5 of the bottom steel plate 1. The bolt 5 is temporarily fixed to the bolt hole 3 of the bottom steel plate 1 in a state in which the rotation is prevented by the strong tightening axial force generated with respect to the fixing nut 24.

  After the bolt 5 has been temporarily fixed as described above, the same procedure as that shown in FIGS. As indicated by a chain line, the entire surface including the head 5b of the bolt 5 is preliminarily coated on the lower surface side of the bottom steel plate 1 in which the bolt 5 is temporarily fixed to the bolt hole 3 via the bolt temporary fixing nut 24. 7 (c), the bottom steel plate 1 and the components placed thereon are mounted using bolts 5 and nuts 6 temporarily fixed in the bolt holes 3 of the bottom steel plate 1 as shown in FIG. What is necessary is just to connect the butt | matching edge parts of the adjacent bottom steel plates 1 via the said joining plate 2 by joining the overlapping part with the contact plate 2. FIG.

  Also in this embodiment, the same effects as those of the embodiment shown in FIGS. 1 (a), (b), (c) to FIG. 3 can be obtained.

  In addition, this invention is not limited only to the said embodiment, The volt | bolt temporary fixing in embodiment of FIG. 1 (a) (b) (c) thru | or FIG. 3, and embodiment of FIG. The outer diameter of the nut 24 may be any material as long as it can be fixed inside the bolt hole 3 by being pushed into the bolt hole 3 of the bottom steel plate 1 together with the bolt 5 while being screwed into the bolt 5. Alternatively, the ratio of setting the diameter larger than the bolt hole 3 of the bottom steel plate 1 may be increased or decreased from 0.5 mm according to the diameter dimension of the bolt hole 3 of the bottom steel plate 1 to be temporarily fixed with the bolt 5. .

  Moreover, the groove | channel 15 provided in the outer peripheral surface of the bolt temporary fixing nut 13 in embodiment of FIG. 1 (A) (B) (C) thru | or FIG. 3, and the hook-shaped protrusion formed between adjacent grooves 15 The width dimension of 16, the arrangement interval in the axial direction, the number of arrangements, the depth dimension, and the like may be appropriately changed according to the size of the bolt temporary fixing nut 13.

  In each of the above-described embodiments, all of the bottom steel plate 1 are assumed on the assumption that the preceding coating is performed on the lower surface side of the bottom steel plate 1 including the head 5b of the bolt 5 temporarily fixed to the bolt hole 3. The procedure for temporarily fixing the bolt 5 to the bolt hole 3 via the bolt temporary fixing nuts 13, 13 a, 18, and 24 has been described in a factory or the like. Is a state in which the bolt 5 is prevented from dropping through the bolt temporary fixing nuts 13, 13 a, 18, and 24 into the bolt hole 3 of the bottom steel plate 1 on the ground at the site where the bottom steel plate 1 is installed. Holding or temporarily fixing, then, the bottom steel plate 1 is arranged in the span direction on the main beam, and the attachment plate 2 is placed on the upper side of the butt ends of the adjacent bottom steel plates 1 from above. The bolt hole 4 of the bottom steel plate 1 is inserted into the bolt hole 4 of the splicing plate 2. The bolts 5 held or temporarily fixed to the bolts 5 are respectively inserted, and nuts 6 are fitted to the shaft portions 5a of the bolts 5 projecting upward from the attachment plate 2 via washers 7, By tightening the nut 6 with respect to the bolt 5, the overlapping portions of the bottom steel plate 1 and the attachment plate 2 may be joined by the bolt 5, respectively. In this case, it can be expected that the work of inserting the bolt 5 into the bolt hole 3 of the bottom steel plate 1 at a high place can be omitted.

  The steel plate joining method of the present invention may be applied to a joining portion between the bottom steel plate 1 and the attachment plate 2 when painting is not required on the lower surface side of the bottom steel plate 1. Furthermore, when joining two steel plates using bolts, if it is desired to attach the bolts to the bolt holes provided in one of the steel plates in advance so as not to drop out, the bottom steel plate 1 is attached. You may apply to the junction part of any steel plates other than the board 2. FIG.

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

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a steel plate joining method of the present invention and a bolt temporary fixing nut used in the method. (A) shows a state where a bolt temporary fixing nut is screwed into a bolt, and (B) shows a bottom steel plate. (C) is a partially cut schematic side view showing a state where a bolt is temporarily fixed to a bolt hole via a bolt temporary fixing nut, and (c) a state where an attachment plate is joined to a bottom steel plate. FIG. 1 is an enlarged view of a bolt temporary fixing nut portion when the steel plate joining method of FIG. 1 is carried out. (A) is a case where a bolt temporary fixing nut screwed into a bolt is pushed together with a bolt into a bolt hole of a bottom steel plate. (B) shows the state in which the bolt is tightened against the bolt temporary fixing nut, and (c) shows the state in which the bolt is stretched by tightening the nut for fixing the attachment plate to the bolt. FIG. It is a partially cutaway side view which expands and shows the volt | bolt temporary fixing nut in FIG. It is a partially cut side view which shows the modification of a bolt temporary fixing nut as other form of implementation of this invention. FIG. 5 shows another embodiment of the present invention, where (A) shows a state where a bolt temporary fixing nut is screwed into a bolt, and (B) shows a temporary fixing of the bolt to the bolt hole of the bottom steel plate via the bolt temporary fixing nut. (C) is a partially cut schematic side view showing a state in which a splicing plate is joined to a bottom steel plate. FIG. 6 is a partially cutaway side view showing the bolt temporary fixing nut in FIG. 5 in an enlarged manner. FIG. 5 shows another embodiment of the present invention, where (A) shows a state where a bolt temporary fixing nut is screwed into a bolt, and (B) shows a temporary fixing of the bolt to the bolt hole of the bottom steel plate via the bolt temporary fixing nut. (C) is a partially cut schematic side view showing a state in which a splicing plate is joined to a bottom steel plate. It is a partially cutaway side view which expands and shows the volt | bolt temporary fixing nut in FIG. It is a cut side view which shows the general connection structure through the joining board of the butt | matching edge parts of the bottom steel plate of an adjacent synthetic floor slab. An outline of an example of a conventionally proposed method for holding the bolt in the bolt hole of the bottom steel plate is shown. (A) shows a state in which the bolt is held in the bolt hole of the bottom steel plate. (C) is a cut side view showing a state in which an attachment plate is placed on the upper side of an adjacent bottom steel plate, and (c) is a cut side view showing a state in which the adjacent bottom steel plates are connected via an attachment plate. An outline of a conventionally proposed method for holding a bolt for joining a bottom steel plate so as not to drop off in a hole provided in a haunch plate for constituting a composite slab is shown. A cut side view showing a state in which a bolt is held in a hole, (b) is a cut side view showing a temporary stopper drop-off preventing body used for holding the bolt.

Explanation of symbols

1 Bottom steel plate (one steel plate)
2 Connecting plate (the other steel plate)
3 Bolt hole 4 Bolt hole 5 Bolt 5a Shaft portion 5b Head 6 Nut 13, 13a Temporary bolt fixing nut 14 Female thread portion 15 Groove 19 Bolt temporary fixing nut 21 Locking protrusion 22 Cylindrical portion 24 Bolt temporary fixing nut 26 Locking Projecting part 27 Cylindrical part

Claims (8)

  A bolt in which a bolt temporary fixing nut having an outer diameter larger than that of the bolt hole is screwed into a bolt hole of one of the two stacked steel plates to be joined using a bolt. The bolt temporary fixing nut is pushed together with the bolt temporary fixing nut from one side surface to fix the bolt temporary fixing nut to the bolt hole, and then the bolt temporary fixing nut fixed to the inner side of the bolt hole. Tighten the bolt and temporarily fix the bolt to the one steel plate in advance, and then drill a bolt hole larger than the outer diameter of the bolt temporary fixing nut on the other side of the one steel plate. A steel plate joining method comprising: joining the two superposed steel plates by disposing the other steel plate and screwing and tightening a nut to the bolt from the outside.   A bolt in which a bolt temporary fixing nut having an outer diameter larger than that of the bolt hole is screwed into a bolt hole of one of the two stacked steel plates to be joined using a bolt. The bolt temporary fixing nut is pushed together with the bolt temporary fixing nut from one side surface to fix the bolt temporary fixing nut to the bolt hole, and then the bolt temporary fixing nut fixed to the inner side of the bolt hole. The bolt is tightened, the bolt is temporarily fixed to the one steel plate in advance, and then an area including the head portion of the bolt on one side surface of the one steel plate is preliminarily painted, and then the one By placing the other steel plate having a bolt hole larger than the outer diameter of the bolt temporary fixing nut on the other side of the steel plate, and screwing the nut to the bolt from the outside to tighten the steel plate, 2 Steel sheet joining method characterized by bonding the steel overlay.   A temporary bolt is provided with a locking protrusion having an outer diameter larger than that of the bolt hole in the bolt hole of one of the two stacked steel sheets to be joined using a bolt. Together with the bolt temporary fixing nut, the locking projection of the bolt temporary fixing nut passes through the bolt hole of the one steel plate together with the bolt temporary fixing nut. Until it comes out to the other side, and then the bolt against the bolt temporary fixing nut that is locked to the outer peripheral edge of the bolt hole on the other side of the one steel plate by the locking projection The bolt is temporarily fixed to the one steel plate in advance, and then a bolt hole larger than the outer diameter of the locking protrusion of the bolt temporary fixing nut is provided on the other side surface of the one steel plate. Place the other steel plate drilled with By tightening from the outside by screwing the nut onto the bolt, the steel sheet joining method characterized by joining the two superimposed steel plates.   A temporary bolt is provided with a locking protrusion having an outer diameter larger than that of the bolt hole in the bolt hole of one of the two stacked steel sheets to be joined using a bolt. Together with the bolt temporary fixing nut, the locking projection of the bolt temporary fixing nut passes through the bolt hole of the one steel plate together with the bolt temporary fixing nut. Until it comes out to the other side, and then the bolt against the bolt temporary fixing nut that is locked to the outer peripheral edge of the bolt hole on the other side of the one steel plate by the locking projection Then, the bolt is preliminarily fixed to the one steel plate, and then the region including the head portion of the bolt on one side of the one steel plate is pre-painted. On the other side, By placing the other steel plate with a bolt hole larger than the outer diameter of the locking projection of the constant nut and screwing the nut onto the bolt from the outside, tightening the two sheets A steel plate joining method, comprising joining steel plates.   A bolt temporary fixing nut for temporarily fixing a bolt, which is passed through a bolt hole of one of the two stacked steel plates to be joined using a bolt, to the one steel plate, the bolt hole of the one steel plate It has a cylindrical shape having a larger outer diameter than the required dimension, and has an internal thread portion on the inner peripheral surface to be screwed to the shaft portion of the bolt. It is characterized in that it can be fixed in the bolt hole by the elastic deformation restoring force compressed in the radial direction at the gap between the bolt hole and the bolt hole by being pushed into the bolt hole of the steel plate. Bolt temporary fixing nut.   The bolt temporary fixing nut according to claim 5, wherein ring-shaped grooves are provided at a plurality of positions in the axial direction on the outer peripheral surface.   One end in the axial direction of a bolt temporary fixing nut for temporarily fixing a bolt passed through a bolt hole of one of the two stacked steel plates to be joined using a bolt to the one steel plate The outer diameter of the part is smaller than the bolt hole of the one steel plate, and the middle part in the axial direction has a larger diameter than the bolt hole of the one steel plate and can be elastically deformed toward the shaft side. Provided with a projecting portion, and having an internal thread portion for screwing onto the shaft portion of the bolt on the inner peripheral surface, and one side surface in the bolt hole of the one steel plate in a state of being screwed to the shaft portion of the bolt By pushing the locking projection from the side until it passes through the bolt hole of the one steel plate and comes to the other side, the locking projection can be locked and fixed in the bolt hole. Bolt temporary fixing nut characterized by having   8. A cylindrical portion having the same diameter as or slightly larger than the bolt hole of one of the two stacked steel plates, on the other end side in the axial direction from the locking projection. Bolt temporary fixing nut described.

Images