JPH0526331Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to fastening fittings for corrugated steel plates.
It mainly relates to fasteners for corrugated steel sheets used in waterways, passageways, and other various structures.

"Prior Art" The present applicant has developed a fastening fitting for corrugated steel plates that can be fastened by one worker from either the inside or outside of the joint.
It is proposed in the issue.

The significance of this proposal is that, for example, unlike the conventional method disclosed in Japanese Patent Publication No. 55-10770, in which the connection between plates can be made only from either side, the sleeve attached to the bolt can be attached to the plate by rotating the bolt. It is possible to fasten corrugated steel plates, which was impossible with fasteners of the type that crimped the plates from both sides, by pressing and crushing them against the edges of the holes in between to form a flange.

In other words, with the conventional fasteners mentioned above, it is an absolute condition that the sleeve end should definitely abut against the perforated edge between the plates, but this prerequisite is not met with corrugated steel plates, so the conventional type Even with these fasteners, it is not possible to fasten corrugated steel plates. In other words, it is extremely difficult to match holes in corrugated steel plates, so for example, a 26mm loose hole is usually set for an M20 bolt, and it is highly unlikely that these holes will match during construction. There is a special situation in which it is technically impractical to caulk these to match.

However, in the case of the above-mentioned conventional type, there is a member intervening to caulk and match the holes and guide the sleeve to the edge of the hole, but in the case of the above-mentioned corrugated steel sheet, it is Since it is impossible to match the holes by caulking, it is not possible to insert such a caulking member.

Therefore, the corrugated steel plate must be able to be tightly fitted to the edge of the hole by being deformed when it is loosely fitted into the hole.

The applicant's existing proposal mentioned above satisfied these requirements.

In other words, the sleeve, which is loosely fitted into the hole, is expanded and deformed by the cone nut, and even in the loosely fitted state, it is locked against the edge of the hole.

``Problems to be Solved by the Invention'' However, in the previously proposed fasteners for corrugated steel plates, there is a limit to the degree of expansion of the sleeve, which inconveniences the applicable corrugated steel plates.

In other words, if the inclination of the taper of the corn nut that bites into the sleeve is set too steeply, the friction at the contact surface with the sleeve will increase, making it impossible to bite and the sleeve will turn as one with the corn nut. Since this occurs, there is a limit and it cannot be expanded beyond a certain level.

Types of corrugate board thickness are 2.7mm, 3.2mm, 4.0
mm, 5.3mm, 6.0mm, and 7.0mm, as the thickness increases, the force required to maintain the connection increases. If a load exceeding the proof strength of the metal fitting is applied, the sleeve will shrink due to insufficient strength (insufficient expansion) and will eventually become disengaged. Under these circumstances, the applicable plate thickness is 2.7mm.
There is a problem that it cannot be applied to plate thicknesses of 3.2 mm and 4.0 mm or more.

In order to obtain a large degree of expansion, the only solution is to increase the maximum diameter of the cone nut or increase the wall thickness of the sleeve. However, both of the above-mentioned measures are inappropriate because they are restricted by the need to insert the hole into the corrugated steel plate.

The present invention was devised in view of these problems with the conventional technology, and its purpose is to provide a method that does not cause any inconvenience when installing into the borehole, and with the same diameter as before. , Existing parts can be used with the same specifications, and the degree of expansion can be increased from 4.0 mm.
The present invention aims to provide a fastening fitting that can achieve the strength required for a plate with a thickness of 7.0 mm.

"Means for Solving the Problems" In order to achieve the above object, the fastening fitting in the present invention has a tapered part in which the inner diameter of the tip part becomes larger toward the open end, and the fastening fitting in the present invention has a tapered part in which the inner diameter of the tip part increases toward the open end. a main sleeve having a plurality of expansion slits, one of which passes through the base, and an engagement groove provided at the base end; The main sleeve has a tapered part whose inner diameter becomes larger toward the opening end, and has a plurality of expansion slits extending from the opening toward the base in series with the main sleeve. The sub-sleeve is arranged, the bottom is formed into a curved surface that matches the curved surface of the corrugated steel plate, and the stopper has a hole into which the base of the main sleeve is inserted, and the four peripheries of the rectangular bottom plate are covered with gold tops. a locking member that is bent downward so that it can be held and has a bolt hole in the center from which a locking pawl that fits into the engagement groove of the main sleeve hangs; and a tapered part of the opening at the tip of the sub-sleeve. The main feature is that it consists of a cone nut that is screwed onto the tip of a bolt that is inserted into the hole.

"Operation" The corn nut that moves with the rotation of the bolt pushes the sub-sleeve, the sub-sleeve pushes the main sleeve, and when they come to a dead end, the corn nut bites into the sub-sleeve, the sub-sleeve bites into the main sleeve, and the sub-sleeve and main The sleeves expand together in a stacked manner. This is equivalent to the main sleeve undergoing expansion with double thickness. As a result,
Strength is significantly increased, providing sufficient strength for plates with a thickness of 4.0 mm or more.

"Example" This will be explained in detail below based on the drawings.

FIG. 1 is a partially cutaway side view of the assembled fastener, where A is a view from the convex side of the corrugated steel plate and B is a view from the concave side. The main sleeve 1 is formed with a tapered part 2 in which the inner diameter of the distal end becomes larger toward the open end, and four slits 3 extending from the open end toward the base end are provided. In the example shown, the ends of the three slits 3 are formed into round holes 4 to prevent the sleeve from cracking when it is expanded, but the remaining one is made through to allow for expansion within the hole. There is. A base engagement groove 6 for a locking pawl, which will be described later, is carved in the base of the sleeve 3.

In the illustrated example, the groove 6 is provided in the punch-through portion of the punch-through sleeve 3.

In the embodiment, the sleeve 1 is made of a steel plate formed into a pipe shape, so a slit 3 with a round hole is formed in the steel plate in advance.
3 and an engaging groove 6 is provided at the end of the slit, and then processed into a pipe.

The rotation preventing member 8 attached to the base of the main sleeve 1 has four peripheral edges 10, 10 of a rectangular seat plate 9 bent downward. Further, a bolt hole 12 is provided in the center of the seat plate 9, and a locking pawl 13 is provided in the bolt hole 12, which is formed outward of the hole diameter and directed downward.

When the locking pawl 13 engages with the base engaging groove 6, the sleeve 1 is prevented from rotating.

Furthermore, a pad 14 is provided on the lower surface of the seat plate 9 and is held between four peripheral edges 10, 10, and a hole 15 into which the sleeve 1 can be inserted is provided in the pad 14. The pad 14 is provided with a concave bottom 14a to be joined to the convex surface of the tube and a convex bottom 14b to be joined to the concave portion of the tube so that the bottom surface of the pad 14 matches the curved surface of the corrugated steel plate.

Thus, a seat is provided that adapts to the uneven surface of the corrugate.

The sub-sleeve 5 is formed with a tapered part 5a in which the outer diameter of the proximal end becomes smaller toward the open end, and a tapered part 5b in which the inner diameter becomes larger towards the open end at the other distal end. , four slits 5c extending in the axial direction from the tip opening end,...
is provided. The tapered portion 5a is in an engaging relationship with the tapered portion 2.

Although the illustrated example shows a case where there is only one sub-sleeve 5, a plurality of sub-sleeves 5 may be arranged in series as required.

Thus, the sub-sleeve 5 becomes an interposition between the main sleeve 1 and the corn nut, which expands into the main sleeve 1 while being pushed by the corn nut, which will be described later.

Next, the bolt 16 to be inserted into the sleeve has a hexagonal head 1
7, and the diameter becomes larger toward the tip of the threaded part,
A cone nut 18 is screwed into engagement with the tapered portion 5b at the tip of the sub-sleeve.

The cone nut 18 has a tapered portion 18a and a parallel portion 1.
8b, and a small diameter relief part 1 at the tip of the parallel part.
8c is formed.

In the drawings, reference numerals 30 and 30 indicate corrugated steel plates to be fastened with the fasteners of the present invention, which have mounting holes 31 and 31 into which the fasteners are inserted, and have a shape in which concave and convex surfaces are alternately repeated. Reference numeral 40 denotes a stopper that engages with the rotation preventing member 8 of the fastener to prevent the sleeve from rotating together, and has a hexagonal cross section, for example. Reference numeral 41 denotes a socket that is fitted into the hexagonal head 17 of the bolt to rotate the bolt.

The fastener first inserts the base of the sleeve 1 through the hole 15 of the stopper 14 of the rotation stopper 8, engages the base engagement groove 6 with the locking pawl 13 of the seat plate 9, and then Attach the cone nut 18 to the tapered portion 5b, and remove the bolt 16 from the base of the sleeve group.
Insert the bolt and screw the tip of the bolt into the cone nut 18 to assemble.

Next, in order to fasten the corrugated steel plates, a mounting hole 31 provided at the joint of the corrugated steel plates 30, 30,
31 are butted against each other, the sleeve group is inserted into the mounting holes 31, 31 from the cone nut 18 side, and the stopper 14 of the rotation preventing member 8 is joined to the joint portion. At this time, if the joint of the corrugated steel plate is a convex surface, the pad 1
4 has a concave bottom 14a, and if the joint is a concave surface, the pad 14 has a convex bottom 14b.

Next, the stopper 40 is fitted to the rotation prevention member 8 protruding from the corrugated steel plates 30, 30, and the socket 41 is fitted to the hexagonal head 17 of the bolt 16. When the rotation prevention member 8 is fixed with the stopper 40 to ensure the connection between the rotation prevention member 8 and the sleeve 1, and then the bolt 16 is rotated, only the cone nut 18 is raised, and the sleeve group is pushed back by the cone nut 18. The cone nut 18 is expanded from the distal end while engaging and intervening with the proximal sleeve, and when the cone nut 18 reaches near the lower part of the corrugated steel plate, all the sleeves are fully expanded and the corrugated steel plate is concluded. This aspect is clearly illustrated in FIG.

As shown, the main sleeve 1 expands last.
Since the degree of expansion is with the interposition of the sub-sleeve 5, it is much larger than the case without intervention (indicated by the two-dot chain line in the figure), which was drawn for comparison reference, even though the diameter of the fitting is the same. be.

``Effect of the invention'' As described above, according to the present invention, the sleeve could be expanded to a large extent without using the inconvenient means of increasing the diameter of the metal fittings, which would have been impossible to achieve with a plate thickness of 4 mm.
The above-described high-strength fastening is possible, and the degree of expansion can be adjusted by adjusting the number of sub-sleeves, which is extremely convenient in practice.

[Brief explanation of drawings]

Figures 1A and 1B are partially cutaway side views of the assembled fastener; A is from the convex side of the corrugated steel plate;
B is a case where the fasteners are attached from the same recess side. Figure 2 A and B are sleeve groups, A is a front view, B is a sectional view, Figure 3 A, B, and C are rotation preventing members, A is a plan view, and B is attached to a convex part of a corrugated steel plate. FIG. 4A and FIG. 4B show a cone nut screwed onto a bolt, A is a front view, and B is a sectional view. Figures A and B show the construction status.
A is a side view in which the fastener is attached from the convex side of the corrugated steel plate, and B is a side view in which the fastener is attached from the concave side. FIG. 6 is a diagram showing the state when the slit is expanded. 1...Main sleeve, 2...Tapered portion, 3...
...Slit, 4...Round hole, 5...Sub sleeve,
5a, 5b...Tapered portion, 5c...Slit, 6
... Base engagement groove, 8 ... Rotating member, 9 ... Square seat plate, 10 ... Side plate, 12 ... Bolt hole, 13
... Locking pawl, 14 ... Button, 14a ... Bottom of recess, 14b ... Bottom of convexity, 15 ... Hole, 16 ... Bolt, 17 ... Hexagonal head, 18 ... Corn nut,
30...Corrugated steel plate, 31...Mounting hole, 40
...stopper, 41...socket.

Claims (1)

[Scope of utility model registration request] The tip has a tapered part in which the inner diameter becomes larger toward the open end, and a plurality of expansion slits from the open end to the base, and any one of the slits
One is a main sleeve that is formed by penetrating the base and has an engagement groove at the base end, and the other is a main sleeve whose outer diameter is tapered so that it can be fitted into the tapered opening at the tip of the main sleeve, and whose inner diameter is at the open end. a sub-sleeve disposed in series on the distal end side of the main sleeve, the sub-sleeve having a tapered part that becomes larger in diameter toward the base, and a plurality of expansion slits extending from the distal opening toward the base; A metal plate is formed into a curved surface and has a hole into which the base of the main sleeve is inserted, and the four peripheral edges of the rectangular bottom plate are bent downward so that the top of the metal can be held, and the main sleeve is formed in the center. A corrugate consisting of a locking member having a bolt hole with a hanging pawl that fits into the engagement groove of the sleeve, and a cone nut that is screwed onto the tip of the bolt that fits into the tapered part of the tip opening of the sub-sleeve. Fasteners for steel plates.