JP2000145744A - Flange connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent connection of flanges from being released or loosened, by covering a head part of a bolt or a nut with a cap, in a flange connecting structure for connecting flanges to each other by using a bolt and a nut. SOLUTION: A first nut 7 is tightened from above, and a second nut 8 is tightened from above it. At this time, the second nut 8 presses the first nut 7 from behind to lock the first nut 7. A cap 9 is put on the second nut 8 from above and bent inward at a cut 11 so that the end 9a may be beyond a stepped part 8a of the second nut, and the cup 9 is fixed to the second nut 8. Therefore, the second nut 8 is covered with the cap 9, and the second nut 8 can not be removed by being directly turned from the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange connection structure, and more particularly to a flange connection structure in which flanges are connected to each other by using bolts and nuts.

[0002]

2. Description of the Related Art Conventionally, in a steel tower, for example, a leg is formed by connecting flanges provided at ends of leg elements thereof with bolts and nuts while connecting the flanges. Has become. And
After the tower was constructed, the bolt and nut means were typically left exposed.

[0003]

Incidentally, in the above-mentioned conventional steel tower, the bolts and nuts may be detached arbitrarily and the connection of the flange may be loosened or loosened. In such a case, there is a possibility that the tower may collapse. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a flange connection structure that can prevent a flange from being disconnected or loosened without permission.

[0004]

According to the present invention, in order to achieve the above object, in a flange connection structure in which flanges are connected to each other by using bolts and nuts,
The head or nut of the bolt is covered with a cap.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a flange connection structure according to the present invention will be described in detail with reference to the accompanying drawings.
1 to 5 show one embodiment of a flange connection structure according to the present invention. The flange connection structure of the present embodiment is applied to a steel tower 1 as shown in FIG. The steel tower 1 has its legs 2 constituted by a plurality of leg elements 3. At the end of each leg element 3, a flange 4 is provided. Each flange 4 has a plurality of bolt insertion holes 5 formed therein. Furthermore, in the flange connection structure of this embodiment, in order to connect the flanges 4 and 4 of the vertically adjacent leg elements 3 and 3 in the steel tower 1, the bolt 6 and the first fastening first to the bolt are performed. A nut 7, a second nut 8 acting to prevent rotation of the first nut,
And a cap 9 for covering the nut.

[0006] The bolt 6 and the first nut 7 have the same shape as a normal one. On the other hand, the upper portion of the second nut 8 has a shape similar to that of a normal nut, but has a structure including a step 8a at the lower portion. The step 8 a is formed by reducing the diameter of the lower part of the second nut 8. In the upper part of the second nut 8, a second female screw hole 1 having a small diameter penetrating the central female screw hole 8b is provided.
3 is formed, and a detent bolt 10 is screwed into the second female screw hole. As shown in FIG. 5, the cap 9 has a cut 11 in the inner peripheral surface near the end 9a. The top 9b of the cap 9 is curved so as to protrude upward, and a female screw hole 12 is formed in the center of the top. The female screw hole 12 is formed with a pitch and a diameter different from those of a normal screw.

Next, the procedure for connecting the flanges 4, 4 of the vertically adjacent leg elements 3, 3 in the steel tower 1 will be described with reference to FIG. First, the bolt insertion holes 5 and 5 are also matched while the flanges 4 and 4 of the vertically adjacent leg elements 3 and 3 are matched. Then, from below, the bolt insertion holes 5,
5 are respectively inserted into the bolts 6 and the screw portions 5 of the bolts are inserted.
3A, the first nut 7 is fastened from above in FIG. 3, and the second nut 8 is further
Are concluded respectively. At this time, the second nut 8 presses the first nut 7 from behind (in FIG. 3, above), so that the first nut 7 prevents rotation of the first nut 7. At this time, the bolt 1 in the second nut 8
By tightening 0, the rotation of the second nut with respect to the bolt 6 is stopped.

Further, using a jig (not shown) or the like, FIG.
The cap 9 is folded inward at the cut 11 so that the cap 9 is put on the second nut 8 from above and the end 9a is also inserted into the step 8a of the second nut. Fix it to the second bolt 8.
As a result, the second nut 8 is covered with the cap 9 and cannot be removed by directly turning the second nut 8 from the outside. When the cap 9 is fixed to the second nut 8 as described above, a positioning pin (not shown) provided in the jig in advance in the female screw hole 12 provided in the top 9a of the cap. May be inserted to perform the fixing work. Thereby, the fixing operation of the cap 9 can be performed smoothly without deforming the shape of the cap. After the cap 9 is fixed to the second nut 8, the female screw hole 12 in the top 9b of the cap is fixed.
Is sealed using a suitable resin material or metal material. This prevents rainwater from entering the inside of the cap 9 and causing rust. The top 9 of the cap 9
The female screw hole 12b may of course be sealed with a suitable resin material or metal material when the cap is manufactured.

When the second nut 8 is to be removed, first, as shown in FIG.
The member that seals the female screw hole 12 is removed with a drill or the like, and then the bolt 16 is screwed into the female screw hole. Bolt 1
Numeral 6 corresponds to the female screw hole 12 of the cap 9 and has a pitch and a diameter different from those of a normal bolt. Next, the bolt 16 is screwed into the second bolt 8 side, and the top 9b of the cap 9 is gradually separated from the second bolt 8, so that the end 9a of the cap is fixed to the second bolt 8. From the step 8a. Thereby, the cap 9 can be removed from the second nut 8, and the second nut and the first nut 7 can also be removed.

FIG. 6 shows another example of a cap that can be employed in the above embodiment. For convenience of explanation, in FIG. 6, components having the same functions as those shown in FIG. 5 are denoted by the same reference numerals. The cap 9 of the present embodiment is formed such that the top 9b projects upward in FIG. 6 in a substantially conical shape. Cap 9 in this example
Has the same function and effect as the cap 9 shown in FIG. FIG. 7 shows still another example of the cap that can be employed in the above embodiment. For convenience of description, in FIG. 7, components having the same functions as those shown in FIG. 5 are denoted by the same reference numerals. The cap 9 of the present embodiment has a top 9b formed in a planar shape. Also in the cap 9 of this example, the same operation and effect as those of the cap 9 shown in FIG.

In this embodiment, an example in which the present invention is applied to a steel tower has been described. However, the present invention is not limited to this, and it is essentially a structure having a flange and having to connect the flanges. If there is, it can be applied to anything. In the above embodiment, the nut is covered with the cap. However, the present invention is not limited to this.
The square head of the bolt may be covered with a cap. Further, in the above embodiment, the second nut is covered with the cap, but the present invention is not limited to this, and if there is no second nut, the first nut may be covered. Further, if there is a third nut, the third nut may be covered. In short, the outermost nut may be covered by the cap.

[0012]

As described above, according to the flange connection structure of the present invention, in the flange connection structure in which the flanges are connected to each other by using the bolt and nut means, the head or the nut of the bolt is connected. Since it is configured to be covered by a cap, the bolt or nut cannot be turned unless the cap is destroyed,
Therefore, it is possible to prevent the flange from being disconnected or loosened without permission.

[Brief description of the drawings]

FIG. 1 is a view showing a leg of a steel tower to which an embodiment of the present invention is applied.

FIG. 2 is an enlarged view showing a portion surrounded by a circle indicated by an arrow A in FIG.

FIG. 3 is an enlarged cross-sectional view showing a main part of one embodiment of the flange connection structure according to the present invention, particularly showing a state where a second bolt is covered with a cap.

FIG. 4 is an enlarged cross-sectional view showing a main part of one embodiment of a flange connection structure according to the present invention, particularly showing a state when a cap is removed from a second bolt.

FIG. 5 is a cross-sectional view showing a cap used in an embodiment of the flange connection structure according to the present invention.

FIG. 6 is a sectional view showing another example of a cap that can be employed in the flange connection structure according to the present invention.

FIG. 7 is a sectional view showing still another example of a cap that can be employed in the flange connection structure according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel tower 2 Leg 3 Leg element 4 Flange 5 Bolt insertion hole 6 Bolt 7 First nut 8 Second nut 8a Step 9 Cap 10 Detent bolt 11 Notch

Claims (4)

[Claims] 1. A flange connection structure in which flanges are connected to each other by means of bolts and nuts, wherein a head or a nut of the bolt is covered with a cap. 2. After fastening the nut to the bolt,
Further, a second nut is fastened, and the second nut is covered with the cap. 3. The second nut has a step, and the end of the cap is penetrated into the step,
The flange connection structure according to claim 2, wherein the cap is fixed to the second bolt. 4. The cap according to claim 1, wherein a cut is formed in an inner peripheral surface near an end of the cap, and the end is bent inward at the cut.
The flange connection structure according to any one of the above.