JP2011080524A - Plate joining tool and plate joining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plate joining tool used to mutually join steel sheet-concrete composition slabs for use in a structure such as a road bridge, capable of dispensing with an operation from the lower side in construction, and a joining method using the joining tool. <P>SOLUTION: The plate joining tool 1 includes a bolt 2 and a circular stopper 3 which can be elastically suitable for a thread part of the bolt 2 from the side. The stopper 3 includes a projection composed of a part of a thread ridge to be meshed with the thread groove of the bolt 2 on its inner circumference in an integrated manner. In joining of plates by use of this tool, the bolt 2 is inserted to a bolt hole provided in a joint region of a composite plate slab 10 to be joined from the lower surface side, and the stopper 3 is elastically fitted, from the side, to the thread part of the bolt 2 protruded to the upper surface side of the composite plate slab. Such composite plate slabs 10 are carried in a construction site, and mutually butted, a splice plate 15 is placed on the joint region, and the protruding portion of each bolt 2 is inserted to a bolt hole of the splice plate 15 and fastened by a nut 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a joining tool suitable for use for joining together steel plates and concrete composite slab steel plates used in structures such as road bridges.

  Steel plates and concrete floor slabs used for structures such as road bridges are those in which concrete is placed on the bottom steel plate, and the bottom steel plate is used as a formwork for concrete placement, and as it is. Used as a floor slab together. For this reason, when steel plate / concrete composite floor slabs are used as floor slabs for bridges, etc., there is no need for formwork for placing concrete during construction, and a scaffold for removing the formwork is built under the floor slab. It is not necessary and is widely adopted because it can reduce the cost of construction.

  In the construction using the steel plate / concrete composite floor slab, a plurality of steel plate / concrete composite floor slabs are arranged and the bottom steel plates are joined and connected to each other to form a floor slab such as a bridge as a whole. This joining is performed using a bolt such as a tensile bolt. FIG. 4 shows a conventional joining method. A joining plate (connecting plate) in which the bottom steel plates 10 of the steel plate / concrete composite floor slabs are abutted with each other at a slight interval and a plurality of bolt holes are formed in two rows. 15 is placed on the connecting portion (butting portion), the bolt holes provided in the splicing plate 15 and the bolt holes provided in the bottom steel plate 10 are overlapped, the bolt 2 is inserted, and the nut 5 is tightened. Is done.

  However, in this way, in order to join steel plate / concrete composite floor slabs together in the field, bolts are inserted from below into bolt holes previously formed in the composite floor slab, and nuts are screwed into the bolts from above. Because it has to be tightened, a working scaffold is required on the underside of the floor slab (an anticorrosion coating must be applied after construction, which is also necessary for this purpose), and the construction is costly There was a point.

  A plate-joining bolt that solves this problem is disclosed in Patent Document 1 below. The bolt disclosed in Patent Document 1 is provided with a node bulging in the outer diameter direction at an axially intermediate portion of the bolt, and formed with screw portions on both sides of the node.

  The joining method using the bolt described in Patent Document 1 is as follows. First, a bolt hole is provided in a joint portion of a steel plate / concrete slab, which is a plate material to be joined, and the bolt with the node is inserted into the bolt hole from above. Since this bolt is provided with a node having a diameter that does not pass through the bolt hole at the upper and lower intermediate portions, this node is caught at the entrance of the bolt hole and does not fall off. In this state, a nut is screwed onto a bolt protruding below the plate material and tightened. Thus, the bolt is fixed to the plate material.

  The steel plate / concrete composite slab to which the knotted bolts are fixed is brought into the construction site, and a plurality of the steel plates / concrete composite slabs are lined up and joined together to be integrated. At the time of this joining, the joining parts of the floor slabs are made to face each other, an attachment plate provided with a plurality of bolt holes is placed thereon, and the bolts projecting upward from the floor slabs on both sides are placed in those bolt holes. Insert and tighten with nuts. As a result, a plurality of floor slabs are integrated to form a floor slab having a predetermined width.

  By the way, the knotted bolt described in the above-mentioned Patent Document 1 can be fixed to a plate material such as a steel plate / concrete floor slab in advance at the factory, and painted on the entire lower surface of the floor slab including the bolt head. Therefore, it is not necessary to perform bolting or painting work from the lower side at the construction site, and the construction can be performed only by the work on the upper side of the floor slab. For this reason, it is not necessary to build a scaffold under the floor slab at the time of construction, and the work at the site is easy, but the bolt used for this has a node formed in the middle part and screws (usually on both sides) Since this is a bolt with a reverse thread), there is a problem that the manufacturing cost of the bolt itself is extremely high, and the construction cost is increased accordingly.

  In Patent Document 2, a high-strength bolt is inserted into the bolt hole of the bottom steel plate from the lower surface side, and the high-strength bolt is fixed with a primary nut. A method of disposing an attachment plate, inserting a bolt into the attachment plate, and tightening a secondary nut from the upper surface side of the attachment plate is disclosed. According to this method, since the bolt is held by the primary nut, there is no possibility that the bolt falls off from the bottom steel plate.

  However, in the technique disclosed in Patent Document 2, since two nuts, a primary nut and a secondary nut, must be screwed from the top of each bolt, it takes time and effort to tighten the nut. There is.

JP 2004-176909 A JP 2006-207116 A

  In view of the above, the present invention eliminates the need to work from the lower side at the construction site, can easily and easily join plate materials, and uses a plate material joining tool that does not require expensive bolts, and uses this An object of the present invention is to provide a method for joining plate materials.

In order to solve the above problems, the present invention employs the following configuration. That is, the plate material joining tool according to the present invention includes a bolt and an arcuate stopper that can be elastically fitted to a screw portion of the bolt from the side surface, and the stopper is disposed on an inner peripheral portion thereof. A protrusion comprising a part of a thread that meshes with a screw groove of the bolt is integrally formed. The protrusions may be continuous as a whole, or a plurality of protrusions may be provided at intervals. In particular, it is preferable to provide three protrusions.

  Moreover, the board | plate material joining method concerning this invention is a method of joining board | plate materials using the said board | plate material joining tool, Comprising: A bolt is inserted into the bolt hole provided in the junction part of the board | plate material which should be joined from the lower surface side of this board | plate material. And a step of elastically fitting the stopper of the plate material joining tool from the side surface to the screw portion of the bolt projecting to the upper surface side of the plate material, and turning the stopper to turn the head of the bolt to the lower surface of the plate material. And a joint plate having a bolt hole placed on the joint portion of the plate materials to be joined to each other, and a protruding portion of the bolt fixed to the plate material in the bolt hole. Both plate materials are joined through an inserting step and a step of screwing and tightening a nut to a bolt protruding from the upper surface side of the attachment plate. It is preferable that the bolt hole of the attachment plate has a size that allows the stopper to be accommodated therein.

  Since this plate material joining tool includes a stopper that can be engaged with and fixed to the screw groove of the bolt by elastically fitting to the screw portion of the bolt from the side of the bolt. The bolt can be easily and reliably fixed to the plate material by fitting the stopper to the screw portion on the upper side of the plate material of the bolt inserted from below. Since the inward projection provided on the stopper forms part of the thread that is screwed onto the bolt, turning the stopper fitted on the bolt in the tightening direction causes the stopper to be placed on the plate surface. It can be firmly fixed in close contact with. The bolt itself may be a commonly used bolt, and since the structure of the stopper is simple, the overall cost can be reduced.

  In addition, since the above-mentioned stopper can be fitted at an arbitrary position in the upper and lower middle part of the bolt, by fitting the stopper near the surface of the plate material, even if it is not rotated as many as the nut, It is convenient because it can be tightened with a slight rotation.

  Further, according to the plate material joining method according to the present invention, the fastener is fitted to the bolt using elasticity from the side surface of the upper surface side protruding portion of the bolt inserted into the bolt hole of the plate material from the lower surface side. Since the bolt can be fixed to the plate material, the operation of fixing the bolt to the plate material can be easily and reliably performed at the factory, and the bolt insertion operation from the lower surface of the plate material is unnecessary at the construction site. This eliminates the need for a work scaffold on the lower surface side of the plate material, and enables safe and economical work.

  Hereinafter, embodiments of the present invention will be specifically described. The figure shows one embodiment of the present invention. This plate material joining tool 1 includes a bolt 2, a stopper 3, a washer 4, and a nut 5. The nut 5 is a hexagonal nut, and the washer is a normal ring-shaped washer.

  Although the said bolt 2 may be a commercially available bolt normally used for this kind of application, it is preferable to use a high strength bolt, and it is particularly preferable to use a torcia type high strength bolt as shown in FIG. The bolt 2 has a rounded shape with a rivet-like head, is easy to paint, and has an aesthetic appearance after construction.

  The dimensions of the bolt 2 may be optimized depending on the application, but the bolt often used for joining this type of floor slab has a nominal thread size of M22, and the length of the threaded portion is 40 mm. In the drawing, the dimension D is 38.5 mm, and H is 14 mm.

  As shown in FIG. 2, the stopper 3 has a substantially ring-shaped outer shape, and a part thereof is cut out in a horseshoe shape to form an opening 6. Three protrusions 7 are provided on the inner peripheral portion of the stopper 3. The protrusion 7 has a wedge-shaped cross section as shown in FIG. 2 (b), and its tip has the same shape and dimensions as the cross-sectional shape of the thread of the nut screwed into the bolt. In other words, the protrusion 7 serves as a tooth that meshes with the groove of the bolt. For this reason, the three protrusions 7 are slightly shifted from each other in the thickness direction so as to fit the lead of the screw. In addition, the protrusion 7 may be a continuous thread, or a plurality of protrusions 7 may be provided at intervals. The number of protrusions 7 may be one or two depending on circumstances, and may be four or more, but is most preferably three. The cross-sectional shape of the portion other than the protrusion 7 is a rectangle, but the cross-sectional shape of this portion may be other than the rectangle if there is no problem in strength. In addition, the stopper 3 may be obtained by cutting out the outer periphery of a thin nut having a thickness of about 5 mm or less (the number of threads is, for example, 1 to 3) into a horseshoe shape. In this case, the thickness of the stopper 3 may be thinner than the thickness of the attachment plate.

  The stopper 3 is made of a steel material having a predetermined strength and elasticity, such as carbon steel (SK5M) or alloy steel, and it is preferable to use spring steel from the viewpoint of elasticity. Dimensional examples of what is used for the bolt 22 of M22 described above, the outer diameter A in FIG. 2 is φ26, the inner diameter is φ21, the thickness t is 3 mm, the width d is 2.5 mm, the angle α is 30 degrees, the protrusion width w Is 5 mm. Further, the inner diameter E of the opening 6 is a size that can be fitted into the screw portion of the bolt 2 by using elasticity from the side and is not easily removed after fitting, and is used for the M22 bolt. In the illustrated example, it is 16.5 mm.

  Next, the method of using the plate material joining tool 1 will be described with reference to an example in which the plate material joining tool 1 is used for joining steel plates / concrete composite slabs.

  First, the bolt 2 is inserted into the bolt hole provided in the joint portion of the steel plate / concrete composite floor slab (hereinafter referred to as “synthetic floor slab”) 10 from the lower surface side. It is preferable that the inner diameter of the bolt hole of the composite floor slab 10 is slightly larger than the outer diameter of the shaft portion of the bolt 2 and does not cause backlash. For example, if the diameter of the shaft portion of the bolt 2 is 22 mm, it may be about 24.5 mm, which is about 2.5 mm larger than that. In a state where the head of the bolt 2 is in close contact with the lower surface of the steel plate of the composite floor slab, the stopper 3 is driven from the side into the screw portion of the bolt protruding to the upper surface side of the composite floor slab. Since this stopper 3 has elasticity and a part of the outer periphery thereof is open on the horseshoe, when the opening 6 is applied from the side to the shaft of the bolt and hit with a hammer or the like, the opening 6 is formed. It is elastically pushed open and can be easily fitted to the bolt.

In this fitted state, the protrusion 7 of the stopper 3 is engaged with the thread groove of the bolt 2. Since the head of the bolt 2 is not necessarily firmly attached to the lower surface of the composite floor slab 10 simply by fitting the stopper 3, the stopper 3 is turned so that the head is sufficiently firmly attached. It advances to the axial direction of the volt | bolt 2, and it presses on the upper surface of the synthetic floor slab 10. FIG. In this case, it may be rotated by applying a rotational force to the end of the opening 6 of the stopper 3 or may be rotated using a tool such as a torque wrench. Since the stopper 3 has elasticity, it is possible to prevent the tightening of the composite floor slab 10 and the bolt 2 from being loosened when the stopper 3 is completely in close contact.

  In addition, in order to make rotation of the stopper 3 easy, you may form the plane (wrench flat) for wrench in the outer peripheral part of this stopper 3 in multiple places.

  Rust prevention coating is applied to the entire lower surface of the composite floor slab 10 to which the bolt 2 is fixed. When painting is completed, the composite floor slab 10 with bolts is carried into the construction site. Then, a plurality of composite floor slabs 10 are arranged side by side in a predetermined place so that the connecting portions of adjacent composite floor slabs face each other.

  An attachment plate 15 is arranged on the composite floor slab 10 arranged in parallel. At this time, the bolts 2 protruding from the upper surfaces of the composite floor slabs 10 on both sides are inserted into the screw holes provided in advance on the attachment plate 15. It is necessary to provide a plurality of bolt holes in at least two rows in the attachment plate 15 so that the bolts 2 of the adjacent composite floor slabs 10 are respectively inserted.

  In addition, when the stopper 3 is interposed between the upper surface of the composite floor slab 10 and the lower surface of the attachment plate 15, a torcross at the time of tightening is generated, and the adhesion between them is impaired. The bolt hole of the attachment plate 15 is made larger than the outer diameter of the stopper 3 so that the stopper 3 is accommodated in the hole. For this purpose, it is necessary to make the thickness of the stopper 3 smaller than the thickness of the attachment plate 15. Specifically, when the thickness of the attachment plate 15 is 6 mm, the thickness of the stopper 3 may be about 3 mm.

  If the size of the bolt hole of the attachment plate 15 is too small, it is difficult to fit the stopper 3 into the bolt hole. On the other hand, if the size of the bolt 3 is too large, rattling may occur. It is preferable to make it several mm (for example, 2 mm) larger than the outer diameter. Specifically, when the outer diameter of the stopper 3 is 26 mm, the hole diameter of the attachment plate 15 may be about 28.5 mm at the maximum.

  When the contact plate 15 is arranged so as to connect the composite floor slabs 10 on both sides, the nut 5 is screwed to the thread portion of the bolt 2 protruding from the upper surface side of the contact plate 15 via the washer 4. As a result, the plurality of composite floor slabs 10 are joined and connected to each other.

  Since the plate material joining tool 1 can drive the stopper 3 from the side surface along the surface of the member into which the bolt 2 is inserted as described above, the work is quick. The stopper 3 is tightened by a method such as hooking a rotary tool on the end of the horseshoe-shaped opening, and usually only by one turn. Since the stopper 3 has elasticity, once it is tightened, it is not loosened by some vibrations due to the characteristics of the spring. Further, by adopting a high-strength steel type such as alloy steel or spring steel, the strength of the protrusion 7 can be increased, and the stopper 3 can be slid to be less likely to be damaged, thereby effectively preventing the bolt from falling off. Can do.

  According to the construction method using this plate material joining tool 1, the work of inserting and fixing bolts from the lower surface of the plate material can be performed in the factory, so that the lower surface side of the plate material can also be painted in the factory. This makes it possible to work safely and quickly without requiring a special scaffold at the construction site. Further, as described above, a bolt having a complicated shape is not used, and the bolt is fixed by driving a stopper from the side of the bolt, so that the operation is simple and can be performed quickly.

It is an external view showing one Example of the board | plate material joining tool concerning this invention. They are a top view (a), a left side view (b), and a right side view (c) of the stopper. It is sectional drawing showing the state which fixed the synthetic floor slab and the attachment board using the board | plate material joining tool of this invention. It is sectional drawing showing the conventional joining method.

DESCRIPTION OF SYMBOLS 1 Board | plate material joining tool 2 Bolt 3 Stopper 5 Nut 6 Opening part 7 Protrusion 10 Composite plate plate 15 Attachment plate

Claims (4)

A bolt and an arcuate stopper that can be elastically fitted to the threaded portion of the bolt from the side, and the stopper has a thread that engages with a thread groove of the bolt on the inner periphery thereof. A plate material joining tool characterized by integrally forming protrusions comprising a part. The plate material joining tool according to claim 1, wherein three protrusions are provided at intervals. It is a method of joining plate materials using the plate material joining tool according to claim 1 or 2, wherein a bolt is inserted from a lower surface side of the plate material into a bolt hole provided in a joint portion of the plate materials to be joined. Then, the stopper of the plate material joining tool is elastically fitted from the side surface to the screw portion of the bolt protruding to the upper surface side of the plate material, and the head of the bolt is firmly attached to the lower surface of the plate material by turning the stopper. And placing a connecting plate having a bolt hole thereon, and inserting a protruding portion of a bolt fixed to the plate material into the bolt hole. A plate material joining method comprising: joining both plate materials through a step and a step of screwing and tightening a nut to a bolt protruding to the upper surface side of the attachment plate. 4. The method for joining plate members according to claim 3, wherein the bolt hole of the attachment plate is sized to accommodate a stopper therein.

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