JP4337361B2 - Steel plate joining method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steel plate joining method and apparatus.
[0002]
[Prior art]
In general, as a floor slab for a bridge, a composite floor slab is widely used in which a plurality of bottom steel plates are installed on a main girder and joined, and concrete is placed on the joined bottom steel plates.
[0003]
In the conventional case, the bottom steel plate is usually joined to the bottom steel plate and the splice plate in a state in which the bottom steel plate is installed on the main girder and then the splice plate is attached to the upper surface side of the joint portion of the adjacent bottom steel plates. A bolt such as a high-tensile bolt is inserted into the bolt hole drilled in the bottom steel plate, and a nut is fastened to the screw portion of the bolt projecting to the upper surface side of the splice plate.
[0004]
However, in the conventional method for joining bottom steel plates of floor slabs as described above, it is necessary to install a work scaffold on the lower surface side of the bottom steel plate, which increases the construction man-hours associated with the scaffold installation and increases the construction cost. Had.
[0005]
Conventionally, for example, those shown in FIGS. 5 (a) and 5 (b) exist to eliminate such drawbacks, and this is performed in advance before the bottom steel plate 1 is installed on the main girder. The bolt 4 is inserted into the bolt hole 3 in the joint 2 of the bottom steel plate 1 so that the head 4a is located on the lower surface side of the bottom steel plate 1, and the inner diameter of the circular washer is inserted into the screw portion 4b of the bolt 4. A bolt drop-preventing metal fitting 5 having a threaded portion is screwed to the portion, and the bottom steel plate 1 through which the bolt 4 is inserted is laid on the main girder, and then the joint portion 2 of the bottom steel plates 1 adjacent to each other. From the upper surface side, the bolt 4 is inserted into the hole 6 of the filler plate 7 and the bolt hole 9 of the splice plate 8 through the filler plate 7 in which the hole 6 for receiving the bolt drop prevention metal fitting 5 is formed. Attach it so that it It is obtained so as to tighten the nut 10 with respect to the bolt 4 from the upper surface side of the chair plate 8. In FIG. 5, reference numeral 11 denotes a washer interposed between the splice plate 8 and the nut 10. (For example, refer to Patent Document 1.)
[0006]
In order to eliminate the above-mentioned drawbacks, for example, there are conventional ones as shown in FIGS. 6 (a) to 6 (e) and FIG. 7, which are shown in FIG. 6 (a). As shown, before the bottom steel plate 1 is installed on the main girder, the bolt 4 is inserted into the joint 3 of the bottom steel plate 1 so that the head 4a is positioned on the lower surface side of the bottom steel plate 1 in advance. 7 and a bolt drop prevention fitting 12 having a shape as shown in FIG. 7 is fitted to the threaded portion 4b of the bolt 4, and the bottom steel plate 1 into which the bolt 4 is inserted is installed on the main girder. After that, as shown in FIG. 6B, the splice plate 8 is inserted from the upper surface side of the joint portion 2 of the bottom steel plates 1 adjacent to each other so that the bolt 4 is inserted into the bolt hole 9 of the splice plate 8. Attach, then, as shown in FIG. A washer 11 is fitted to the bolt 4 from the upper surface side of the splate 8 and the nut 10 is temporarily tightened. From this state, the bolt drop prevention metal fitting 12 locked to the threaded portion 4b of the bolt 4 is By pulling the pulling wire 13 in the lateral direction, the nut 4 is pulled out from the threaded portion 4b of the bolt 4 as shown in FIG. 6 (d), and thereafter, as shown in FIG. It is tightened up to. (For example, see Patent Document 2.)
[0007]
[Patent Document 1]
JP-A-11-324199 (page 4, FIG. 1)
[Patent Document 2]
JP 2001-279854 A (3rd to 4th pages, FIG. 2 and FIG. 4)
[0008]
[Problems to be solved by the invention]
However, in the case of the one disclosed in Patent Document 1, a special order product such as the bolt drop prevention metal fitting 5 in which the inner diameter portion of the circular washer is threaded is required, and an extra member such as a filler plate 7 is required. On the other hand, the bolt drop prevention metal fitting 5 that is substantially the same as the nut must be sufficiently fastened to the screw portions 4b of all the bolts 4, and the work of installing the filler plate 7 must also be performed. There was a problem that it took considerable time and labor.
[0009]
Moreover, in the case of what was disclosed by patent document 2, it is the bolt fall prevention metal fitting 12 which has the very special shape latched with respect to the thread part 4b of the volt | bolt 4 at three points, and the tension | pulling wire 13 was assembled | attached. However, when manufacturing such a bolt drop prevention fitting 12, the number of parts increases and the number of steps for assembling the tension wire 13 to the fitting itself is also required, which increases the manufacturing cost. Since the bolt drop prevention metal fitting 12 is locked only at three points with respect to the screw portion 4b of the bolt 4, when the bottom steel plate 1 is installed on the main girder, the screw drop portion 4b of the bolt 4 is caused by vibration or the like. There is a high possibility of falling off, and when the bolt drop prevention metal fitting 12 locked to the threaded portion 4b of the bolt 4 is finally pulled out and removed, the pulling wire 13 is detached from the metal fitting or cut off. There is also, it can be said to have a problem in terms of reliability.
[0010]
In view of such circumstances, the present invention prevents the dropping of the bolt inserted through the bolt hole in the joining portion of the steel plate efficiently and reliably by using an inexpensive part having a very simple structure. Further, it is an object of the present invention to provide a steel plate joining method and apparatus that can eliminate the need for installing a work scaffold on the lower surface side of the steel plate.
[0011]
[Means for Solving the Problems]
The present invention is a steel plate joining method constructed by joining adjacent steel plates,
Before installing the steel plate on the girder, insert the bolt into the bolt hole in the joint of the steel plate so that its head is located on the lower surface side of the steel plate,
A thin plate made of plastic is formed with an engagement portion that has an inner diameter that substantially matches the valley diameter of the screw portion of the bolt and that can be fitted to the screw portion of the bolt. Forming a cracked part so as to have an arc shape exceeding the circle, and a bolt drop prevention piece formed with a handle part on the side opposite to the cracked part of the thin plate is fitted to the screw part of the bolt,
After the steel plate in which the bolt is inserted and the bolt drop prevention piece is fitted to the screw portion of the bolt is installed on the girders, the splice plate is connected to the joint portion of the adjacent steel plates from the upper surface side of the splice plate. A bolt is inserted into the bolt hole so that the nut is temporarily tightened to the bolt from the upper surface side of the splice plate, and the bolt drop prevention piece fitted to the screw portion of the bolt is attached to the handle portion. The steel plate joining method is characterized in that it is removed from the screw portion of the bolt by pinching and twisting so that the thin plate is deformed, and the nut is tightened.
[0012]
[0013]
[0014]
[0015]
Further, the present invention is a steel plate joining apparatus constructed by joining adjacent steel plates,
Before installing the steel plate on the girder, in advance, a bolt inserted so that its head is located on the lower surface side of the steel plate with respect to the bolt hole in the joint portion of the steel plate,
A thin plate made of plastic is formed with an engagement portion that has an inner diameter that substantially matches the valley diameter of the screw portion of the bolt and that can be fitted to the screw portion of the bolt. It is formed by forming a cracked part so as to have an arc shape exceeding the circle, and forming a handle part on the opposite side to the cracked part of the thin plate, and is fitted to a screw part of a bolt inserted into the steel plate and A bolt drop prevention piece that can be removed from the threaded portion of the bolt by pinching the handle and twisting it so that the thin plate deforms,
It is formed of a plate in which a bolt hole into which the bolt can be inserted is formed, and the steel plate in which the bolt is inserted and a bolt drop prevention piece is fitted to the screw portion of the bolt is installed on a girder, A splice plate attached so that a bolt is inserted into the bolt hole from the upper surface side with respect to a joint portion of steel plates adjacent to each other;
The present invention relates to a steel plate joining apparatus comprising a nut that is fastened to a bolt from the upper surface side of the splice plate.
[0016]
[0017]
[0018]
[0019]
According to the above means, the following operation can be obtained.
[0020]
When configured as described above, the bolt drop prevention piece should be an inexpensive part having a very simple structure that can be detached from the screw part of the bolt simply by pinching the handle part and twisting it so that the thin plate is deformed. In addition, an extra member such as the filler plate in the conventional example is unnecessary, and the bolt can be easily attached to the screw portion.
[0021]
In particular, the bolt drop prevention piece is formed on the thin plate with an engagement portion that has an inner diameter that substantially matches the valley diameter of the thread portion of the bolt and that can be fitted to the thread portion of the bolt. Since the engagement portion of the fall prevention piece, which has an arc shape exceeding at least a semicircle, is securely fitted to the screw portion of the bolt, it seems to be locked at three points with respect to the screw portion of the bolt in the conventional example. Compared to other types of bolt drop prevention metal fittings, there is almost no possibility that the bolt drop prevention piece will fall off the threaded part of the bolt due to vibrations, etc. Since there is no separate part like this, there is no fear that it will come off or break, and the reliability will be improved.
[0022]
Further, since the bolt drop prevention piece has a handle portion on the opposite side of the thin cracked portion of the thin plate, when the bolt drop prevention piece is attached to or detached from the screw portion of the bolt, the handle portion is pinched. Thus, it is possible to make it easier to perform the twisting operation so that the thin plate is deformed, which is advantageous in making the operation smoother.
[0023]
Furthermore, by forming a thin plate of plastic, because you have configured bolts fall prevention piece, low cost allows manufacturing the bolts fall prevention piece than than metals, moreover, there is no fear of corrosion, over a long period Can be reused.
[0024]
That is, in the steel plate joining method and apparatus of the present invention, by using the bolt drop prevention piece as described above, it is not necessary to install a work scaffold on the lower surface side of the steel sheet, and an increase in the number of construction steps accompanying the scaffold installation can be avoided. At the same time, construction costs can be reduced.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0026]
1 to 3 show an example of an embodiment of the present invention. In the drawings, the parts denoted by the same reference numerals as those in FIGS. 5 and 6 represent the same thing and are twisted to the threaded portion 4b of the bolt 4. A bolt drop prevention piece 14 (see FIG. 2) that can be freely removed is prepared, and before the bottom steel plate 1 is installed on the main girder, the bolt 4 is inserted into the bolt hole 3 in the joint 2 of the bottom steel plate 1 in advance. The head 4a is inserted so that the bottom steel plate 1 is positioned on the lower surface side of the bottom steel plate 1, and a bolt drop prevention piece 14 that is removable by being screwed into the screw portion 4b of the bolt 4 is fitted (FIG. 1 (a)). )), The bottom steel plate 1 in which the bolt 4 is inserted and the bolt drop prevention piece 14 is fitted to the screw portion 4b of the bolt 4 is installed on the main girder, and then the joint portion 2 of the adjacent bottom steel plates 1 is joined. Against the splice plate 8 from the upper surface side. The bolt 4 is inserted into the bolt hole 9 of the plate 8 (see FIG. 1B), and the washer 11 is fitted to the bolt 4 from the upper surface side of the splice plate 8 and the nut 10 is temporarily tightened. (See FIG. 1 (c)), the bolt drop prevention piece 14 locked to the threaded portion 4b of the bolt 4 is removed from the threaded portion 4b of the bolt 4 by twisting (see FIG. 1 (d)), and the nut 10 is tightened (see FIG. 1 (e)).
[0027]
In the case of this illustrated example, the bolt drop prevention piece 14 is formed on a plastic thin plate 14a having a thickness of about 1 to 2 [mm], as shown in FIG. An engagement portion 14b having a matching inner diameter D and capable of being fitted to the screw portion 4b of the bolt 4 is formed, and the tip crack portion 14c is formed so that the engagement portion 14b has an arc shape exceeding at least a semicircle. The grip portion 14d is formed on the opposite side of the thin plate 14a to the tip crack portion 14c.
[0028]
For example, as shown in FIG. 3, the splice plate 8 has an overall length L of about 1 [m], a width W of about 210 [mm], and a pitch P of the bolts 4 of about 150 [mm]. When the bolt 4 is linearly arranged in this way, only one type of bolt drop prevention piece 14 with the handle portion 14d protruding from the end edge of the splice plate 8 may be prepared. However, for example, as shown in FIG. 4, when the splice plate 8 in which the bolts 4 are arranged in a staggered manner is used, two types of bolt drop prevention pieces 14 having different lengths of the handle portion 14d may be prepared. good.
[0029]
Next, the operation of the illustrated example will be described.
[0030]
When configured as described above, the bolt drop prevention piece 14 can be made of an inexpensive part having a very simple structure that is detachable from the threaded portion 4b of the bolt 4 simply by twisting. An extra member such as the filler plate 7 (see FIG. 5) in the example is unnecessary, and the bolt 4 can be easily attached to the screw portion 4b.
[0031]
In particular, in the illustrated example, the thin plate 14 a is formed with an engagement portion 14 b that has an inner diameter D that substantially matches the valley diameter of the screw portion 4 b of the bolt 4 and that can be fitted to the screw portion 4 b of the bolt 4. At the same time, the bolt drop prevention piece 14 is formed by forming the cracked portion 14c so that the engagement portion 14b has an arc shape exceeding at least a semicircle, and therefore, at least half of the bolt drop prevention piece 14 is formed. Since the engaging portion 14b having an arc shape exceeding the circle is surely fitted to the screw portion 4b of the bolt 4, it is locked at three points with respect to the screw portion 4b of the bolt 4 in the conventional example. When compared with the type of bolt drop prevention metal fitting 12 (see FIG. 7), the bolt drop prevention piece 14 may fall off the screw part 4b of the bolt 4 due to vibration or the like when the bottom steel plate 1 is installed on the main girder. There is almost no conventional Pull wire 13 (see FIG. 7) because another part does not exist it eliminates at all fear of or cut off, such as, so that the reliability is enhanced in.
[0032]
In the illustrated example, the bolt drop prevention piece 14 is formed by forming the handle portion 14d on the opposite side of the thin crack portion 14c of the thin plate 14a. When attaching / detaching to / from the screw portion 4b, the handle portion 14d is pinched so that the operation of twisting the thin plate 14a to be deformed can be facilitated, which is advantageous in making the operation smoother.
[0033]
Furthermore, in the illustrated example, the bolt fall prevention piece 14 is formed by forming the thin plate 14a from plastic, so that the bolt fall prevention piece 14 can be manufactured at a lower cost than metal, and corrosion is also caused. Therefore, it can be reused for a long time.
[0034]
That is, in the illustrated example, by using the bolt fall prevention piece 14 as described above, it is not necessary to install a work scaffold on the lower surface side of the bottom steel plate 1, and an increase in construction man-hours associated with the scaffold installation can be avoided. Construction costs can also be reduced.
[0035]
In addition, in order to make the surface contact between the head 4a of the bolt 4 and the bottom steel plate 1 more reliable, a washer (not shown) is inserted between the head 4a of the bolt 4 and the bottom steel plate 1. Anyway.
[0036]
Thus, when the floor slab is constructed, the bolt 4 inserted through the bolt hole 3 in the joint portion of the bottom steel plate 1 can be efficiently and reliably prevented from dropping by using an inexpensive part having a very simple structure. It is possible to eliminate the need to install a work scaffold on the lower surface side of the bottom steel plate 1.
[0037]
The steel plate joining method and apparatus of the present invention are not limited to the above-described examples, and the outer shape of the bolt drop prevention piece 14 is not limited to a circle but may be an ellipse or a polygon. The tip crack portion 14c is not limited to the shape in which the tip side is widened as shown in FIG. 2, but may be a simple slit shape, and is constructed by laying and joining a plurality of steel plates on the beam. Needless to say, various modifications can be made without departing from the gist of the present invention.
[0038]
【The invention's effect】
As described above, according to the steel plate joining method and apparatus of the present invention as described above, the bolts inserted through the bolt holes in the joined portions of the steel plates are simply dropped using inexpensive parts having a very simple structure. Therefore, it is possible to effectively and surely prevent it, and to achieve an excellent effect that it is not necessary to install a work scaffold on the lower surface side of the steel plate.
[Brief description of the drawings]
FIG. 1 is a side view showing a procedure of a joining process of an example of an embodiment for carrying out the present invention.
FIG. 2 is a plan view of a bolt drop prevention piece according to an example of an embodiment of the present invention.
FIG. 3 is an overall plan view of a splice plate in an example of an embodiment for carrying out the present invention.
FIG. 4 is a partial plan view showing another example of a splice plate.
5A and 5B are diagrams showing an example of the prior art, in which FIG. 5A is a plan view, and FIG.
FIG. 6 is a side view showing a procedure of another conventional joining process.
FIG. 7 is a perspective view showing a bolt drop prevention fitting used in another conventional example.
[Explanation of symbols]
1 Bottom steel plate (steel plate)
2 Joint part 3 Bolt hole 4 Bolt 4a Head 4b Screw part 8 Splice plate 9 Bolt hole 10 Nut 14 Bolt fall prevention piece 14a Thin plate 14b Engagement part 14c Tip crack part 14d Handle part D Inner diameter

Claims (2)

A steel plate joining method constructed by joining adjacent steel plates,
Before installing the steel plate on the girder, insert the bolt into the bolt hole in the joint of the steel plate so that its head is located on the lower surface side of the steel plate,
A thin plate made of plastic is formed with an engagement portion that has an inner diameter that substantially matches the valley diameter of the screw portion of the bolt and that can be fitted to the screw portion of the bolt. Forming a cracked part so as to have an arc shape exceeding the circle, and a bolt drop prevention piece formed with a handle part on the side opposite to the cracked part of the thin plate is fitted to the screw part of the bolt,
After the steel plate in which the bolt is inserted and the bolt drop prevention piece is fitted to the screw portion of the bolt is installed on the girders, the splice plate is connected to the joint portion of the adjacent steel plates from the upper surface side of the splice plate. A bolt is inserted into the bolt hole so that the nut is temporarily tightened to the bolt from the upper surface side of the splice plate, and the bolt drop prevention piece fitted to the screw portion of the bolt is attached to the handle portion. A steel plate joining method, wherein the steel plate is removed from the threaded portion of the bolt by pinching and twisting so that the thin plate is deformed, and the nut is tightened. A steel plate joining apparatus constructed by joining adjacent steel plates,
Before installing the steel plate on the girder, in advance, a bolt inserted so that its head is located on the lower surface side of the steel plate with respect to the bolt hole in the joint portion of the steel plate,
A thin plate made of plastic is formed with an engagement portion that has an inner diameter that substantially matches the valley diameter of the screw portion of the bolt and that can be fitted to the screw portion of the bolt. It is formed by forming a cracked part so as to have an arc shape exceeding the circle, and forming a handle part on the opposite side to the cracked part of the thin plate, and is fitted to a screw part of a bolt inserted into the steel plate and A bolt drop prevention piece that can be removed from the threaded portion of the bolt by pinching the handle and twisting it so that the thin plate deforms,
It is formed of a plate in which a bolt hole into which the bolt can be inserted is formed, and the steel plate in which the bolt is inserted and a bolt drop prevention piece is fitted to the screw portion of the bolt is installed on a girder, A splice plate attached so that a bolt is inserted into the bolt hole from the upper surface side with respect to a joint portion of steel plates adjacent to each other;
A steel plate joining apparatus comprising: a nut that is fastened to a bolt from an upper surface side of the splice plate.

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