JP2004176909A - Bolt for joining plates, and method for joining plates using the bolt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bolt for joining plates and a method for joining the plates using the bolt for eliminating the need for working space at the lower surface side of the plate by allowing clamping work to be made only from the upper side of the plate when joining the plates, such as a steel sheet used for a steel construction including a road bridge/a steel sheet in a concrete composite floor panel, by bolts at a construction site. <P>SOLUTION: In the case of the composite floor panel, a plurality of steel sheets 5 are fixed to each splice plate 11 being arranged to cover junction sections 9, 9 that are close to and oppose the plurality of steel sheets 5. A bolt 1 for joining the steel sheets for performing friction junction flatly is formed by providing screw sections 2, 2a at both the sides, and providing a joint section 4 with a size so that it can pass a bolt hole 10 being provided on the splice plate 11 and does not pass a bolt hole 6 being provided on the steel sheet 5 between the screw sections 2, 2a. Since the bolt 1 is not pulled out of the steel sheet 5, it can be easily fixed by a nut 8 from the lower surface side of the steel sheet 5 in advance, the steel sheets 5 can be connected each other for joining via the splice plate 11 by work only from the upper surface side of the steel sheet 5 at the construction site, thus greatly reducing execution costs. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a bolt for connecting and frictionally joining plates such as a steel plate on a bottom surface of a steel plate / concrete composite slab used for a steel structure such as a road bridge and a joining method of the plate using the bolt.

  A steel plate / concrete composite slab used for steel structures such as road bridges is a concrete floor plate in which the steel plate on the bottom is part of the cross section of the concrete floor plate. It is also used as a formwork for casting. Therefore, the work of removing the formwork after concrete casting can be omitted, and a scaffold and support work for removing the mold under the floor plate are not required, and the cost advantage at the time of construction is great.

  In the composite floor slab, as shown in FIG. 9D, a plurality of steel plates 21, 21 a are usually attached to the attachment plate 25 by fastening parts such as bolts 22, 22, nuts 23, 23 and washers 24, 24. The steel plates on the bottom surface of the composite floor slab are formed by being friction-joined together. The procedure of this joining is as follows.

  First, as shown in FIG. 9 (a), on one steel plate 21 to be joined, bolt holes 26 and 27 provided on one side half of the contact plate 25 are provided in the steel plate 21 and the contact plate 25, respectively. The bolts 22 are inserted from the lower side of the steel plate 21, and the washer 24 and the nut 23 are fitted from above the attachment plate 25. Then, the nut 23 is tightened from above the steel plate 21, and the attachment plate 25 is fixed to one of the steel plates 21. Next, as shown in FIG. 9B, the other steel plate 21a to be joined is brought close to the one steel plate 21 to which the attachment plate 25 is fixed, and bolts provided on each of the steel plate 21 and the attachment plate 25 are provided. The other half of the attachment plate 25 is overlapped so that the holes 26a and 27a coincide with each other, and the bolt 22 is inserted from the lower surface of the steel plate 21a as shown in FIG. 9C. Then, as shown in FIG. 9D, a washer 24 and a nut 23 are fitted to the bolt 22, and the nut 23 is tightened and tightened from the upper surface side of the steel plate 21a, and the attachment plate 25 is fixed to the steel plate 21a. I do. In this way, as a result of the attachment plates 25 being fixed to the respective steel plates 21 and 21a, the steel plates 21 and 21a are friction-joined by the bolts 22 and the nuts 23 via the attachment plates 25.

  However, when the steel plates are joined to each other using the bolts 22 as described above, the bolts 22 are inserted through the lower surfaces of the steel plates 21 and 21a, and the washers 24 and the nuts 23 are held while the bolts 22 are not dropped. Since it is necessary to fit and tighten, the joining operation cannot be performed only from the upper surface side of the steel plates 21 and 21a. For this reason, a scaffolding is also provided on the lower surface side of the steel plates 21 and 21a at the erection site, a bolt 22 is inserted therefrom, and the construction procedure of fastening from the upper surface side of the steel plates 21 and 21a has to be performed. This eliminates one of the aforementioned cost advantages of the composite slab, which eliminates the need for a scaffold under the floorboard due to the elimination of the frame removal operation.

  In order to solve such a problem, as a method of eliminating the work from the lower surface side of the steel plate at the erection site, as shown in FIG. Ribs 28 and 28 are provided, and the ribs 28 and 28 are fastened to each other with bolts 29 and nuts 30. Also, as shown in FIG. A method in which the nut 30 is welded in advance and the nut 30 is welded in advance to the other steel plate 21a, the bolt 29 is inserted through the connection plate 31 into the other steel plate 21a, and the nut 30a is tightened by tightening. As shown in FIG. 10 (c), nuts 30 and 30 are welded to both steel plates 21 and 21 in advance, respectively, and bolts 29 are inserted from above to fasten the attachment plate 25 to both steel plates 21. Fixed, a method of joining the steel plates 21, 21 have been disclosed (e.g., see Patent Document 1).

  Similarly, as a method for eliminating the work from the lower surface side of the steel plate at the erection site, the following steel plate joining method is disclosed (for example, see Patent Document 2). That is, as shown in FIG. 11A, first, bolts 29, 29 are inserted from the lower surfaces of the steel plates 21, 21 to be joined, and bolt screw portions 29 a, which protrude from the upper surfaces of the steel plates 21, 21. By mounting the drop prevention member 32 to which the pulling wire 32a is attached on the side surface of the 29a, all the bolts 29 are held so as not to fall off from the steel plate 21. Then, at the construction site, as shown in FIG. 11B, the attachment plate 25 having the bolt holes 27 on both sides thereof is inserted into the bolt holes 27 through the respective bolt screw portions 29a, and the steel plate 21, The nut 30 is disposed just above the joining portions 33, 33 of the mounting member 21 and the nut 30 is attached to all the bolt screw portions 29a protruding above the bolt holes 27 of the attaching plate 25 as shown in FIG. The contact plate 25 is loosely fitted and is temporarily fixed so that the fall prevention member 32 can be easily removed. Next, as shown in FIG. 11D, when the drop prevention member 32 is pulled out from the bolt screw portion 29a with the pulling wire 32a, the bolt 29 does not come off and is stopped by the nut 30 as shown in FIG. Can be Finally, as shown in FIG. 11 (e), the steel plates 21, 21 can be joined via the attachment plate 25 by tightening the nut 30 into the bolt screw portion 29 a.

JP-A-2000-47616 ([0008] to [0015]) JP 2001-279854 A ([0016] to [0029])

  However, in the joining method shown in FIG. 10A of Patent Document 1, the bolt 28 itself may be fatigued and broken due to a kind of lever reaction force, that is, a bending stress using the main girder that bridges the composite slab as a fulcrum. In addition, there is shown a test result in which fatigue fracture of the steel plate 21 occurs due to local bending for forming a rib 28 at an end functioning as a connection flange (see Non-Patent Document 3).

Guideline for Steel Structure Design PART (B) Composite Structure (Public Works Institute of Japan, 1997, pp. 181-182)

  Further, in the joining method of FIG. 10B, it is necessary to weld a connecting plate to one steel plate 21 and to weld a nut 30 to the lower surface of the other steel plate 21a in correspondence with a bolt 29 insertion point. Also, in the joining method shown in FIG. 10C, it is necessary to weld the nuts 30 to the lower surfaces of the two steel plates 21 in correspondence with the places where the bolts 29 are inserted. Accompanied by

  On the other hand, in the joining method shown in FIGS. 11 (a) to 11 (e) shown in Patent Document 2, in order to tighten the nut 30 from one direction on the upper surface side to the screw portion of the bolt 29 inserted from the lower surface side of the steel plate 21 in advance. For the bolt 30, it is necessary to use a high-strength one-side bolt whose price is 10 times or more that of a normal high-strength bolt, and the construction cost increases. In addition, the fall prevention member 32 must be separately provided and attached and detached to all bolts for joining the steel plate 21, which is complicated.

  Therefore, an object of the present invention is to use a bolt such as a steel plate or a steel plate of a concrete composite slab used for a steel structure such as a road bridge at an erection site using a bolt, for example, only from the upper surface side of the plate material. It is an object of the present invention to provide a bolt for joining plate materials and a method for joining plate materials using the bolts, which enables the fastening operation of the plate material and does not require a work space on the lower surface side of the plate material.

  In order to solve the above problems, the present invention employs the following configuration.

  That is, a plate material joining bolt for joining a plurality of plate materials in a pile has threaded portions on both sides thereof, and a bulge having a size not passing through the bolt hole of at least one of the laminated plate materials between the threaded portions. It was formed by providing a knot.

  With this configuration, even if a bolt is inserted from the upper surface side into each of the bolt holes whose centers coincide with each other in the plurality of stacked plate members, the node does not pass through at least one of the bolt holes. The bolts are held by the plate material and do not fall, even when the plate material is stacked vertically or obliquely. Then, a nut can be fastened simply and easily by first tightening a nut into one of the threaded portions of the joining bolt having threaded portions on both sides that protrude from the lower surface of the plate material. Thereby, the plate members can be joined by a fastening operation only from the upper surface side, and the joining operation is simplified.

  The plate material is a steel plate, and the steel plate is opposed so that a joint thereof is close to the steel plate, and an adhering plate is overlapped so as to cover the joint, and the nodes are provided on the steel plate and the adjoining plate, respectively. It can be formed in a size that does not pass through one bolt hole.

  In this way, even if a bolt is inserted into the bolt hole provided in the steel plate or the attachment plate from the upper surface side, the node does not pass through the bolt hole as described above, and the bolt is held and dropped. do not do. Then, the nut can be fastened simply and easily by first tightening a nut into one of the screw portions of the joining bolt having screw portions on both sides that protrude from the lower surface side of the steel plate or the attachment plate. Further, an attachment plate provided with a bolt hole having a size large enough to pass through the joint portion is disposed on a steel plate so as to cover the joining portion from above the fixed bolt, and protrudes to the upper surface side of the attachment plate. By fitting a nut to the other threaded portion of the bolt and tightening it from the upper surface side of the steel plate, the attachment plate and the steel plate can be fixed without deteriorating the steel plate material.

  A plurality of plate members are opposed to each other such that their joint portions are close to each other, and a plate material joining bolt to be joined via an abutting plate arranged so as to cover the joint portion is screwed to the shaft portion. It is also possible to provide a hook ring formed so that the hook ring does not pass through at least one of the bolt holes provided in the plate member or the attachment plate.

  Even if a bolt is inserted into the bolt hole provided in the plate material or the attachment plate from the lower surface side, as described above, the hook ring does not pass through the bolt hole, and the bolt is held and does not drop. Also in this case, the plate members can be joined by a fastening operation only from the upper surface side, and the joining operation is simplified. In addition, since the bolt head is located on the lower outer surface of the plate material that is visible to the public, and the nut does not appear to protrude, the appearance is improved.

  It is preferable that the plate joining bolt is a torcia-type high-strength bolt.

  If a torcia-type high-strength bolt is used as the joining bolt, the round bolt head is located on the lower outer surface of the steel plate 5 that is visible to the public, so that it looks like a rivet joint, and the appearance is aesthetic. Excellent in design.

  When the plate material is a steel plate, a pair of steel plates to be bonded is tightened with a nut from the upper surface side of the pair of steel plates. Since it is possible to connect and join through the intermediary, the fastening operation after the erection can be performed only from the upper surface side. As a result, there is no need to provide a scaffold on the lower side of the steel plate, and the work is performed only from the upper side, so that the construction cost of composite slabs etc. involving the joining work of the steel plate can be significantly reduced and the safety is improved Work environment is improved.

  It is preferable that the height in the axial direction of the node is formed equal to or less than the thickness of the contact plate.

  With this configuration, the washer inserted into the bolt always comes into contact with the upper surface of the attachment plate, and the nut can be tightened from above to stably fix the attachment plate to each steel plate.

  It is desirable that the direction of the thread of the threaded portion provided on both sides of the bolt is formed in the same direction.

  With this configuration, when the nut is tightened from the upper surface side of the plate material such as a steel plate to the other screw portion provided on the bolt, the bolt projecting to the lower surface side thereof is fixed in advance to the plate material such as the steel plate. It is possible to prevent the nut tightened in one of the screw portions from being loosened.

  It is desirable that the height of the hook ring in the axial direction be equal to or less than the thickness of the attachment plate.

  In this case, even in the case of the joining bolt provided with the hook ring, the inserted washer always comes into contact with the upper surface of the attachment plate, and a nut is tightened from above to stabilize the attachment plate to each steel plate. Can be fixed.

  The bolts for joining plate materials provided with the above-described knots are inserted into bolt holes provided in each of the plate materials to be joined, and the knot portions of the bolts are applied, and a nut is attached to one of the screw portions protruding from the lower surface side of the plate material. A first step of tightening and fixing the bolts to the plate material in advance, and a joint portion of the plate materials being brought close to each other and opposed to each other, and the nodes thereof pass through corresponding to the bolts fixed to the plate material in the first step. An attachment plate provided with a bolt hole having a size is disposed on a plate from above the bolt so as to cover the joint, and then the upper surface of the plate is fixed with a nut fitted to the other thread of the bolt fixed to the plate. The plate members can be joined by a method of tightening from the side and a second step of fixing the attachment plate and the respective plate members.

  As described above, in the first step, the joints provided on the bolts fit into the bolt holes of the plate material such as a steel plate, so that the bolts do not fall out, and the nuts are tightened from the lower surface side of the plate material, and the bolts are removed from the plate material. Can be fixed to Then, in the second step, after the erection, the attachment plate and the plate member arranged so as to cover the joint portion of the plate member can be fixed by tightening the plate member with a nut from the upper surface side. Therefore, the plate members can be connected and joined via the attachment plate by a fastening operation only from the upper surface side of the plate members.

  The plate joining bolt provided with the above-mentioned hook ring is inserted from below into a bolt hole provided in each of the plate members to be joined, and fitted around the bolt hole from above by screw connection to the shaft of the bolt. A first step of applying the inserted hook ring and fixing the bolt to the plate in advance, and a joining portion of the plate being brought close to and opposed to each other, and a contact plate is attached from above the bolt fixed to the plate in the first step. After arranging on the plate material so as to cover the joint portion, a nut is fitted to a screw portion of the bolt fixed to the plate material, and tightened from the upper surface side of the plate material to fix the attachment plate and each plate material. The plate material can be joined by the method comprising the steps of:

  In this way, in the first step, the hook ring fitted into the shaft portion of the bolt by screw connection hits around the bolt hole of the plate material such as a steel plate, so that the bolt does not come off and the nut is removed from the lower surface side of the plate material. The bolt can be fixed to the plate by tightening. Then, in the second step, after the erection, the attachment plate and the plate member arranged so as to cover the joint portion of the plate member can be fixed by tightening the plate member with a nut from the upper surface side. Therefore, the plate members can be connected and joined via the attachment plate by a fastening operation only from the upper surface side of the plate members.

  An attachment plate is provided below one plate to be joined, and a joint portion of the plate is located in the middle of the attachment plate, and a bolt hole provided in the plate and a bolt hole provided on one side of the attachment plate are provided. The plate material joining bolt provided with the above-mentioned knot portion is inserted from above the plate material, and the knot portion is applied to one of the bolt holes provided in the plate material and the abutment plate, respectively. The bolt for connecting the plate material is inserted into the bolt hole provided on the side from above, and the node is applied to the bolt hole, and these bolts are attached to one of the screw portions protruding from the lower surface side of the attachment plate by a nut. A first step of tightening and fixing in advance to the attachment plate, and the other plate material to be joined to the attachment plate such that the joint portion is close to and opposed to the joint portion of the one plate material, Overlap the bolts inserted into the other side from above, and cover the joints of these plates. After arranging another attachment plate from above each bolt fixed to the attachment plate, tightening from the upper surface side of the plate material with a nut fitted to the other screw portion projecting from the upper surface, the upper surface of the plate material and The plate material can also be joined by the method including the second step of fixing the attachment plates to the lower surface.

  In this way, since a plate material such as a steel plate can be joined to both surfaces thereof via the contact plates, the number of friction surfaces increases, that is, the friction force at the contact interface increases, and the joining state becomes more stable. I do.

  An attachment plate is provided below one plate to be joined, and a joint portion of the plate is located in the middle of the attachment plate, and a bolt hole provided in the plate and a bolt hole provided on one side of the attachment plate are provided. The plate material joining bolt provided with the above-mentioned hook ring was inserted from below the abutment plate and provided around the bolt hole provided in the plate material by screw connection to the shaft portion of the bolt from above the bolt hole. A hook ring is applied, the plate material joining bolt is inserted from below into the bolt hole provided on the other side of the attachment plate, and a hook ring fitted onto the shaft of the bolt by screw connection from above is applied, A first step of fixing these bolts to the attachment plate in advance, and attaching the other plate material to be joined to the attachment plate so that the joint thereof is opposed to the joint of the one plate material in the vicinity thereof. From the top of the bolt inserted into the other side, After placing another contact plate from above each of the bolts fixed to the contact plate so as to cover the joint portion of these plate members, a nut fitted to the screw portion of the bolt protruding from the upper surface thereof The plate material can also be joined by a method of tightening the plate material from the upper surface side and fixing the attachment plate to the upper and lower surfaces of the plate material, respectively.

  Even in the case of using the bolt provided with the hook ring, since a plate material such as a steel plate can be joined to both surfaces of the bolt via the contact plates, the number of friction surfaces increases, that is, the friction force at the contact interface increases. Therefore, the joining state is more stable.

  As described above, according to the present invention, a bolt having a threaded portion on both sides and a bulged joint between the threaded portions is provided for joining a plate material such as a steel plate used for a steel plate / concrete composite slab or the like. In the case of the composite floor slab, even if a bolt is inserted through the steel plate from above, the node hits the bolt hole, the bolt is held and does not fall, and the bolt is placed on the lower surface of the steel plate. Can be easily fixed. At the erection site, the steel plate can be connected and joined via the attachment plate only by fastening work from the upper surface side of the steel plate, so that there is no need to provide a scaffold on the lower surface side of the steel plate, which involves the work of joining the steel plate. The construction cost of the composite floor slab and the like can be greatly reduced, and since the work is performed only from the upper surface side of the steel plate, the work environment is improved, such as safety is improved.

  As described above, a torcia-type high-strength bolt provided with a hook ring on a shaft portion of the bolt by screw connection can be used for joining the plate members, and the plate members are joined by a fastening operation only from the upper surface side. Because the round bolt head of the torcia-type high-strength bolt is located on the lower surface of the joined plate material that is visible to the public, the appearance is improved and the design is excellent.

  Hereinafter, an embodiment of the present invention will be described with reference to the attached FIGS.

  FIG. 1 shows a plate material of the present invention, that is, a bolt 1 for joining steel plates, and threaded portions 2 and 2a in the same direction are formed on both sides of the bolt 1 for joining steel plates. Between these male screws 2 and 2a, there is provided a node 4 having a diameter D at a central portion larger than the diameter d of the bolt shaft portion 3, and the surface of the node portion 4 is formed from the central portion to the shaft portions 3 on both sides from the central portion. It is formed in an axially symmetric plane in a tapered shape toward the side. Normally, a high-strength bolt is used as the bolt 1 together with the washer 7 and the nut 8.

  FIGS. 2A to 2C show a procedure for joining the steel plates 5 and 5 of the composite floor slab by using the bolts 1 of the double-threaded type with the joints. FIG. 2A shows that bolts 1 and 1 are inserted into the respective steel plates 5 and 5 from above, and the joints 4 and 4 are fitted into bolt holes 6 and 6 provided in the steel plates 5 and 5 and hit. , Nuts 8 fitted to the threaded parts 2, 2 of the bolts 1, 1 projecting from the lower surface side of the bolts 1, 2 through washers 7, 7, and fix the bolts 1, 1 to the steel plates 5, 5 in advance. 3 shows a state after the first step in which the joints 9 of the steel plates 5 are brought close to and opposed to each other.

  FIGS. 2B and 2C show that, in the second step, the attachment plate 11 provided with the bolt holes 10, 10 of a size that allows the joints 4, 4 of the bolts 1, 1 to pass through is attached to the bolts 1, 1. (FIG. 2 (b)), and placed on the steel plates 5, 5 so as to cover the joints 9, 9, and then wash the washer to the other threaded portions 2a, 2a of the fixed bolts 1, 1, respectively. The nuts 8a, 8a are fitted via the nuts 7a, 7a, and tightened from the upper surface side of the steel plates 5, 5 to fix the attachment plate 11 and the respective steel plates 5, 5 (FIG. 2 (c)). Things.

As shown in FIG. 2 (a), the diameter D of the node portion 4 of the bolt 1, for fall prevention, formed larger than the diameter d ₀ of the bolt holes 6 provided on the steel plate 5, also, the bolt Since the diameter d _{0 of the} hole 6 is formed larger than the diameter d of the bolt shaft 3, the diameters D, d ₀ , and d have a relationship of D> d ₀ > d. It is sufficient that the diameter D of the node 4 is at least about 1 mm larger than the diameter d ₀ of the bolt hole 6. In addition, the height H of the node portion 4 needs to be smaller than the plate thickness t of the attachment plate 11 shown in FIGS. 2B and 2C. The node portion 4 may be formed in a cylindrical shape having a size such that the outer peripheral surface thereof is not tapered but does not pass through a bolt hole.

  The embodiment of the present invention is configured as described above, and its operation will be described below.

Since the bolt 1 is a double-screw type bolt provided with the node 4 having a diameter D larger than the diameter d ₀ of the bolt hole 6 provided in the steel plate 5, as shown in FIG. Even if the bolt 1 is inserted from the upper side of each steel plate 5, the bolt 1 does not come off and is tightened with the nut 8 via the washer 7 from the lower surface side of the steel plate 5, and the bolt 1 can be easily fixed to the steel plate 5 in advance. .

  Further, since the joint 4 is formed in a tapered axially symmetrical surface from the center portion of the joint portion 4 to the bolt shaft portions 3 on both sides, the tapered axially symmetrical surface is fitted into the bolt hole 6 and hits. 1 is located at the center of the bolt hole 6. Thereby, it becomes easy to arrange the contact plate 11 on the steel plate 5 through the joint portion 4, and the gap between the diameter of the bolt hole 10 provided in the contact plate 11 and the outer diameter D of the joint portion 4 can be reduced. The steel plate 5 and the attachment plate 11 are less likely to be shifted from each other.

  Further, as shown in FIGS. 2B and 2C, the height H of the node portion 4 is equal to the height of the plate 11 of the attachment plate 11 arranged so as to cover the joint 9 of the steel plate 5 from above the bolt 1. Since the thickness is smaller than t, the washer 7a inserted into the bolt 1 comes into contact with the upper surface of the attachment plate 11, and the nut 8a is tightened from above to fix the attachment plate 11 to each steel plate 5 stably. . In this way, the steel plates 5, 5 can be joined via the attachment plate 11.

  Since the fastening operation for fixing the attachment plate 11 to each steel plate 5 can be performed only by tightening the nut 8a from the upper side of the steel plate 5, it is not necessary to provide a scaffold on the lower surface side of the steel plates 5, 5. (5) The construction cost of the composite floor slab and the like involving the joining operation can be significantly reduced, and the working environment is improved, for example, the safety is improved.

  Hereinafter, as an example, a description will be given of a slip test result of a joint portion of a steel sheet joined using the present invention.

  3 (a) and 3 (b) show a specimen 12 used for the slip test. As shown in FIG. 4, the specimen 12 has male screws 2a, 2a (M22 , Pitch 2.5, grade F10T), a bolt 1a in which a joint 4a is formed between these threaded portions 2a, 2a, and washers 7, 7a, nuts 8a, 8b are used as fastening members, As described above, the steel plates 5a and 5b are opposed to each other with the joining portions 9a and 9b close to each other, and are joined via the attachment plate 11. The node portion 4a is formed in a columnar shape, and chamfers 4b and 4b are provided on both ends facing the bolt hole, and each has a tapered shape narrowing toward the bolt shaft portion 3a. The dimensions of the specimen 12 and the bolt 1a are shown in FIGS.

  The diameter of the node 4a is about 3 mm, which is about 25 mm larger than the diameter of the shaft 3a of the bolt 1a, and the diameter of the bolt holes 6a and 6b provided in the steel plates 5a and 5b is 24.5 mm. The shaft portion 3a passes through the bolt holes 6a and 6b, but does not pass through the node portion 4a. Therefore, when assembling the specimen 12, the shaft portion 3a does not fall off the steel plates 5a and 5b as described above. I have. Further, the attachment plate 11 is provided with bolt holes 13 having a diameter of 26.5 mm so that the attachment plate 11 can be disposed on the steel plates 5a and 5b after passing through the node portion 4a. Then, depending on the degree of tightening of the nuts 8a and 8b, one steel plate 5a of the specimen 12 is fixed and the other steel plate 5b is a sliding side, and the bolts 1a on either side are primarily tightened with a predetermined torque. After that, the nut 8a is further rotated by 120 ° on the fixed side, and the nut 8b is rotated by 90 ° on the sliding side to complete the tightening.

  As shown in Table 1, the specimen 12 has three different surface states for the friction surface, that is, the respective contact surfaces between the steel plate 5a and the contact plate 11, and three specimens are provided for each surface state. Was subjected to the test. The base treatment is a treatment in which surface roughness is finished to about 10 μm Rz according to JIS B 0601 by grid blasting or shot blasting. The thick-film-type inorganic zinc-rich paint process is a coating process using an airless coating machine with a target film thickness of 75 μm. The blast treatment is a treatment in which the surface roughness is finished to 50 μmRy or more by grid blasting or shot blasting after the hot-dip galvanizing treatment.

The specimen 12, vertically set in a tensile tester, gradually increasing the load P, the load at the time in which the steel plate 5a and the spliced plate 11 started sliding, i.e. to determine the slip load P _S. Then, the slip coefficient μ was calculated by the following equation.
μ = P _S / (m ・ n ・ N)
Here, m: number of friction surfaces n: number of bolts N: axial force of introduced bolt In the case of this embodiment, the number m of friction surfaces and the number n of bolts are 2 respectively.

  Table 2 shows the magnitude of the calculated slip coefficient μ. From Table 2, it was confirmed that the slip coefficient μ was 0.40 or more, which is the acceptable value, in any of the specimens 12 in any surface state.

  5 (a) to 5 (d) show another embodiment. In this embodiment, as shown in FIG. 5 (d), the upper and lower surfaces of the steel plates 5, 5 are attached to each other. The plates 11, 11a are fixed. First, as shown in FIG. 5A, the joint 4 of the bolt 1 is formed larger than one bolt hole 10a provided in the lower attachment plate 11a, and has the same size as the bolt hole 10a. One of the steel plates 5 to be joined having the bolt holes 6 is positioned such that the joint portion 9 is located at the middle of the contact plate 11a, and the bolt hole 6 of the steel plate 5 and one of the bolt holes 10a of the contact plate 11a are connected to each other. And the bolt 1 is inserted from above. The bolt 1 has its node 4 fitted into the bolt hole 6 of the steel plate 5 and remains without falling off. The other bolt 1a provided with the node 4a is inserted into the other bolt hole 10b of the same size as the bolt hole 10a of the attachment plate 11a, and the node 4a is inserted into the bolt hole 10b of the attachment plate 11a. It fits and stays in place as well.

  Next, as shown in FIG. 5B, the nuts 8a, 8a are tightened from the lower surface side of the attachment plate 11a via washers 7a, 7a, and the respective bolts 1, 1a are fixed to the attachment plate 11a. I do. After that, it is an on-site work, and as shown in FIG. 5 (c), the other steel plate 5a to be connected, which has a bolt hole 6a larger than the joint portion 4a of the bolt 1a, is passed from above the bolt 1a, and the attachment plate is attached. 11a. Then, as shown in FIG. 5 (d), the upper contact plate 11 provided with bolt holes 10 and 10c large enough to pass through the joints 4 and 4a is passed through the bolts 1 and 1a so as to pass through the steel plates 5 and 5a. After stacking, the nuts 8, 8 are tightened via washers 7, 7, respectively, in the fastening work from the upper side of the steel plates 5, 5a, so that the upper and lower attachment plates 11, 11a and the steel plates 5, 5a And are fixed together.

  Also in this case, the steel plates 5, 5a can be joined via the attachment plates 11, 11a provided above and below. Since the steel plates 5, 5a are fixed at the joints 9, 9 via the upper and lower contact plates 11, 11a, the number of friction surfaces increases, that is, the friction force at the contact interface increases, and the slip coefficient μ increases. And the bonding state is more stable.

  FIG. 6 shows a plate material of another embodiment, that is, a steel plate joining bolt 1b. The joining bolt 1b is a torcia-type high-strength bolt having a round bolt head 14, and the illustration of a pin tail portion is omitted. ing. The bolt 1b has a hook ring 15 fitted on the shaft portion 3 by screw connection, and is used as a set together with the washer 7 and the nut 8 when joining steel plates.

  When a torcia-type high-strength bolt provided with a pin tail portion is used as the bolt 1b (a set of the Japan Road Association Standard "Torcia-type high-strength bolt for frictional joining, hexagon nut, flat washer"), the tightening of the bolt is completed. Since it can be confirmed by the breakage of the pin tail, it is possible to prevent forgetting to tighten, and since the tightening is performed using a dedicated wrench, the work can be easily performed with low noise.

  FIGS. 7A to 7C show a procedure of joining the steel plates 5 and 5 of the composite slab using the torcia-type high-strength bolt provided with the hook ring 15 as the plate joining bolt 1b. It is. Illustration of the pin tail portion is omitted. FIG. 7A shows that the bolts 1b, 1b are inserted from below into the bolt holes 6, 6 provided in the respective steel plates 5, 5, and fitted into the shaft portion 3 of the bolt 1b from above by screwing. The state after the first step in which the hook ring 15 is applied around the bolt holes 6, 6 and the bolts 1b, 1b are fixed to the steel plates 5, 5 in advance to prevent the bolts from falling is shown.

  FIGS. 7B and 7C show that, in the second step, the attachment plate 11 provided with the bolt holes 10 and 10 large enough to allow the hooking ring 15 to pass therethrough is inserted from above the bolts 1b and 1b (FIG. 7). 2 (b)), after being arranged on the steel plates 5 so as to cover the joints 9, 9, the screws 2, 2 of the bolts 1 b, 1 b fixed respectively to the steel plates 5, 5 via the washers 7, 7. Nuts 8 and 8 are fitted and tightened from the upper side of the steel plates 5 and 5 to fix the attachment plate 11 and the respective steel plates 5 and 5 (FIGS. 7C and 7D). It is. In the torcia-type high-strength bolt, as is well known, the pin tail portion (not shown) is automatically threaded after the tightening torque of the nuts 8 reaches a predetermined value.

As shown in FIG. 7 (a), the diameter (outer diameter) D of the hook ring 15 fitted into the shaft portion 3 of the bolt 1b by screw connection is a bolt hole 6 provided in the steel plate 5 to prevent falling. is the larger than the diameter d _0, the diameter d ₀ of the bolt holes 6, because it is larger than the diameter d of the bolt shank 3, these diameters D, d _0, d magnitude relationship Is D> d ₀ > d. It is sufficient that the diameter D of the hook ring 15 is at least about 1 mm larger than the diameter d ₀ of the bolt hole 6. According to the Japan Road Bridge Specification, the diameter d ₀ of the bolt hole 6 is specified to be 2.5 mm larger than the diameter d of the bolt shaft 3, so that the diameter D of the hook ring 15 is What is necessary is just to form it about 3.5 mm larger than the diameter d of the shaft part 3. Also, the height Ha of the hook ring 15 needs to be smaller than the thickness t of the attachment plate 11, as shown in FIGS. 7B and 7C. In addition, the length L (see FIG. 6) of the non-threaded portion under the bolt neck needs to be smaller than the thickness t _{0 of the} steel plate 5.

  Even in this case, the plate members can be connected and joined via the attachment plate 11 by the fastening operation only from the upper surface side of the steel plate 5, and the joining operation is simplified. Moreover, since the bolt head 14 uses a high-strength bolt of a round torcia-type high-strength bolt type, the round bolt head is located on the lower outer surface of the steel plate 5 that can be seen, so that it is similar to rivet bonding. It looks good, gives rise to aesthetic appearance, and is excellent in design.

  FIGS. 8A to 8C show another embodiment of the joining method using the torcia-type high-strength bolts (pin tail portions are not shown) provided with the hook rings 15 and 15a as the joining bolts 1b and 1c. It is shown. In this embodiment, as in the case shown in FIG. 5, the attachment plates 11 and 11a are fixed to the upper and lower surfaces of the steel plates 5 and 5a (FIG. 8C). First, as shown in FIG. 8 (a), one steel plate 5 to be joined is positioned such that its joint 9 is located in the middle of the attachment plate 11a, and the bolt hole 6 of the steel plate 5 and one of the attachment plates 11a And the bolt 1b is inserted from below. Next, a hook ring 15 formed so as not to pass through the bolt hole 6 of the steel plate 5 is fitted into the shaft portion 3 of the bolt 1b by screw connection and applied around the bolt hole 6 of the steel plate 5, and the steel plate 5 and The bolt 1b is prevented from dropping by being fixed to the attachment plate 11a. Then, the other bolt 1c is inserted into the other bolt hole 10b of the same size as the bolt hole 10a of the attachment plate 11a, and the hook ring 15a having a size not passing through the bolt hole 10b is connected to the shaft of the bolt 1c. 3a is fitted around the bolt hole 10b, and is fixed to the attachment plate 11a to prevent falling. After that, the work will be on-site work.

As shown in FIG. 8B, the other steel plate 5a to be connected having the bolt hole 6a larger than the outer diameter of the hook ring 15a is passed from above the bolt 1c and overlaps the attachment plate 11a. Then, as shown in FIG. 8 (c), the upper attachment plate 11 provided with bolt holes 10 and 10c of a size that can pass through the hook rings 15 and 15a is passed through the bolts 1b and 1c, and the joining portion 9, After covering the steel plates 5 and 5a so as to cover the nuts 9, the nuts 8 and 8 are tightened through the washers 7 and 7, respectively, by fastening work from the upper side of the steel plates 5 and 5a, and The contact plates 11, 11a and the steel plates 5, 5a are integrally fixed. The length L (see FIG. 6) of the non-threaded portion below the neck of the bolt is smaller than the sum (t ₀ + t) of the thickness of the steel plate 5 and the contact plate 11a for the bolt 1b, and the contact plate 11a for the bolt 1c. Must be smaller than the plate thickness t. As in the case of FIG. 7, after the nuts 8, 8 have been tightened, the pin tail portion (not shown) is automatically threaded.

  Also in this case, the steel plates 5, 5a can be joined via the attachment plates 11, 11a provided above and below. Since the steel plates 5, 5a are fixed at the joints 9, 9 via the upper and lower contact plates 11, 11a, the number of friction surfaces increases, that is, the friction force at the contact interface increases, and the slip coefficient μ decreases. As a result, the bonding state is more stable, and as described above, the appearance is also beautiful and the design is excellent.

Instead of the torcia-type high-strength bolt, the hook ring may be provided on a normal high-strength bolt having a hexagonal bolt head and used as the above-mentioned plate material joining bolt.

  The above-described embodiments shown in FIGS. 2, 5, 7, and 8 all show a case in which a steel plate and an adhering plate are vertically stacked and a joining bolt is inserted in a vertical direction. For example, the present invention can also be applied to a case where a steel plate and an attachment plate are stacked obliquely, and a joining bolt is inserted in an oblique direction.

  INDUSTRIAL APPLICABILITY The present invention can be used for joining steel plate / concrete composite slabs having a high load bearing capacity and excellent durability, which are used as steel structures such as road bridges for supporting traffic loads. It greatly contributes to streamlining and labor saving.

Front view of a plate material joining bolt according to an embodiment of the present invention (A)-(c) Explanatory drawing which shows the joining process of the steel plate using the said bolt same as the above. (A) Front view of specimen for slip test (b) Side view of the same FIG. 3 is a front view of a bolt used for joining the steel plate and the contact plate of the specimen for slip test in FIG. 3. (A)-(d) Explanatory drawing which shows the joining process of the steel plate of other embodiment. Front view of plate material joining bolt of another embodiment (A)-(c) Explanatory drawing which shows the joining process of the steel plate using the bolt of FIG. (A)-(c) Explanatory drawing which shows the joining process of the steel plate of other embodiment same as the above. Explanatory drawing which shows the joining process of the general steel plate of a prior art (A) Explanatory drawing which shows the structural example of the joining part of steel plates of the prior art (b) Same as above (c) Same as above (A)-(e) Explanatory drawing which shows the order of the joining process of the steel floor board of a prior art.

Explanation of reference numerals

1, 1a, 1b, 1c: Bolt 2, 2a: Screw part 3, 3a: Shaft part 4, 4a: Joint part 5, 5a, 5b: Steel plate 6, 6a: Bolt hole 7, 7a: Washer 8, 8a: Nut 9: Joints 10, 10a, 10b, 10c: Bolt holes 11, 11a: Abutment plate 12: Specimen 13: Bolt holes 14: Bolt head 15: Hook ring D: Hook ring outer diameter d: Shaft diameter d ₀ : Bolt hole diameter H: Nodal height Ha: Hook ring height t: Plate thickness

Claims (11)

A plate material joining bolt for joining a plurality of plate materials by overlapping, wherein the bolt has a threaded portion on both sides thereof, and has a size not passing through a bolt hole of at least one of the laminated plate materials between the threaded portions. A bolt for joining plate materials, characterized in that a bulged joint portion is provided. The plate material is a steel plate, and the steel plate is opposed so that a joint thereof is close to the steel plate, and an adhering plate is overlapped so as to cover the joint, and the nodes are provided on the steel plate and the adjoining plate, respectively. The bolt for joining plate materials according to claim 1, wherein the bolt has a size not passing through one of the bolt holes. A plurality of plate members are opposed to each other such that their joints are close to each other, and are plate material joining bolts joined via an attachment plate arranged so as to cover the joints, wherein the bolts are attached to the shaft portions thereof. It is provided with a hook ring which is screwed, and the hook ring has a size that does not pass through at least one of the bolt holes provided in the plate material or the attachment plate. bolt. The bolt for joining plate materials according to claim 3, wherein the bolt for joining plate materials is a torcia-type high-strength bolt. The plate material joining bolt according to claim 1, wherein an axial height of the node portion is equal to or less than a thickness of the attachment plate. The bolt according to any one of claims 1, 2, and 5, wherein the thread directions of the threaded portions provided on both sides of the bolt are formed in the same direction. The plate material joining bolt according to claim 3, wherein an axial height of the hook ring is equal to or less than a thickness of the attachment plate. The plate material joining bolt according to any one of claims 1, 2, 5, and 6 is inserted into a bolt hole provided in each of the plate materials to be joined, and a node portion of the bolt is applied, and protrudes from the lower surface side of the plate material. A first step of tightening a nut into one of the threaded portions and fixing the bolt to the plate in advance, and a joining portion of the plate being brought close to and opposed to each other, and above the bolt fixed to the plate in the first step. After placing the attachment plate on the plate material so as to cover the joining portion, the nut attached to the other screw portion of the bolt fixed to the plate material is tightened from the upper surface side of the plate material with the attachment plate, respectively. And a second step of fixing the plate material. The plate material joining bolt according to any one of claims 3, 4, and 7, which is inserted from below into a bolt hole provided in each of the plate materials to be joined, and around the bolt hole, the shaft of the bolt from above. A first step in which a hook ring fitted by screw connection is applied to the portion and the bolt is fixed to the plate in advance, and a bolt fixed to the plate in the first step in which the joints of the plate are brought close to each other and opposed to each other. After placing the attachment plate on the plate material so as to cover the joining portion from above, a nut is fitted to the screw portion of the bolt fixed to the plate material, and tightened from the upper surface side of the plate material to attach the attachment plate to each of the screws. And a second step of fixing the plate material. An attachment plate is provided below one plate to be joined, and a joint portion of the plate is located in the middle of the attachment plate, and a bolt hole provided in the plate and a bolt hole provided on one side of the attachment plate are provided. 7. One of the bolt holes in which the bolt for joining a plate material according to any one of claims 1, 2, 5, and 6 is inserted from above the plate material, and the joints are provided in the plate material and the attachment plate. , The plate joining bolts are inserted from above into the bolt holes provided on the other side of the attachment plate, and the joints are applied to the bolt holes, and these bolts are projected to the lower surface side of the attachment plate. A first step of fastening a nut to one of the threaded portions and fixing the same to the attachment plate in advance, and the other plate to be joined is opposed to the joint of the one plate in close proximity to the joint of the one plate. On the attachment plate from above the bolt inserted into the other side, and further, After placing another contact plate from above each of the bolts fixed to the contact plate so as to cover the joint portion of the plate member, from the upper surface side of the plate material with a nut fitted to the other screw portion protruding from the upper surface thereof A second step of tightening and fixing the attachment plates to the upper surface and the lower surface of the plate material, respectively. An attachment plate is provided below one plate to be joined, and a joint portion of the plate is located in the middle of the attachment plate, and a bolt hole provided in the plate and a bolt hole provided on one side of the attachment plate are provided. 8. The plate material joining bolt according to any one of claims 3, 4, and 7, which is inserted from below the attachment plate, around a bolt hole provided in the plate material, and from above the shaft portion of the bolt. , A bolt ring provided on the other side of the abutment plate is inserted into the bolt hole provided on the other side of the attachment plate, and the plate material joining bolt is inserted from below the bolt hole, and is fitted into a shaft portion of the bolt from above. A first step of applying these hooking rings to fix these bolts to the contact plate in advance, and setting the other plate to be joined so that the joint thereof is close to and opposed to the joint of the one plate. Weight from above the bolt inserted into the other side of the attachment plate Further, after placing another contact plate from above each of the bolts fixed to the contact plate so as to cover the joint portion of these plate members, the other contact plate was fitted to the screw portion of the bolt projecting from the upper surface thereof. A second step of tightening the plate from the upper surface side with a nut and fixing the attachment plates to the upper surface and the lower surface of the plate material, respectively.