JP2000087946A - High-friction washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extremely reduce the number of high strength bolts by enlarging a frictional force between steel materials. SOLUTION: A washer body 1C having a bolt insertion hole 1B at the center of a disc 1A is formed with satin-like recessed and projecting parts 1D on both contact pressure surfaces 1A1, 1A2. Each the recessed and projecting part 1D comprises plural projecting parts and recessed parts formed side-by-side. The washer body 1C is manufactured by forging or casting and is hardened by using a special steel or by quenching.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-friction washer suitable for high-strength bolt friction joining of steel having a novel structure. In particular, it is suitable for the following points. 1. It is used for high-strength bolted friction joints at columns, beams, small beams, studs, braces, and joints of buildings or structures constructed of steel. It can contribute to resource saving, labor saving and energy saving.

[0002]

2. Description of the Related Art Conventional high-strength bolt friction joints,
The friction coefficient at the connection is about 0.45.

[0003]

The above-mentioned prior art has the following problems. 1. The number of high-strength bolts 8 used for joints and connections between steel materials is large. 2. The attached steel plate 8A used for the friction joint and the connection is also inevitably large, which is inconvenient to handle and transport. 3. Friction joint, beam (large) base material 2 at connection, beam (small)
There are many perforations in the base material 3 and the attached steel plate 8A, which takes much time and effort. Similarly, a large number of perforations in the base material cause a reduction in base material strength. 4. On the friction surface, in order to secure a friction coefficient, it is necessary to carefully treat and protect the mutual surfaces of the base metal and the attached steel plate. 5. In the case where there is a difference in the thickness of the steel materials to be connected, the construction is performed by using a filler steel (filler) 8B. However, a plurality of steel plates are used, and the number of friction surfaces is increased. There is a situation where the reliability of joints and connections is lost. 6. There is a market in the market where the friction is increased by applying irregularities in the shape of wires or annual rings to the steel plate for connection, but the steel plate is in accordance with the dimensions of the connection steel and has tailor-made properties It is unavoidable and leaves inefficient processing and distribution. For this reason, the attached steel plate cannot be made into an off-the-shelf product or mass-produced, resulting in high costs. The present invention has been made in view of such problems of the conventional technology, and has as its object to provide the following. It enables resource saving, labor saving, low cost, energy saving, and high-speed construction.

[0004]

Means for Solving the Problems In order to achieve the above object, the present invention is as follows. That is,
According to the present invention, a bolt through hole 1B is provided at the center of the disk 1A.
In the washer body 1C having an opening, the one contact pressure surface 1A1 and the other contact pressure surface 1A2 of the washer body 1C are formed with a satin-shaped uneven portion 1D, and the satin-shaped uneven portion 1D is in an adjacent state. Projections 1D1 grouped by
And the concave portion 1D2, and the convex portion 1D1 is formed in a pyramid shape protruding outward in a state parallel to the high-strength bolt 1E penetrating into the bolt through hole 1B, and the concave portion 1D2 is formed in the bolt through hole 1B. A high-friction washer which is formed in an inverted pyramid shape depressed inward in a state parallel to the high-strength bolt 1E to be penetrated, and is made by forging or casting and hardened by special steel or quenching. It is.

The operation is as follows. 1. The procedure may be in accordance with the usage of general high-strength bolts, but a high friction washer 1
Into the respective high-strength bolts and tighten the high-strength bolts. 2. Uneven portion 1 of hardened high friction washer 1
D is set into the base material and the attached steel plate, and the steel portion of the deformed portion caused by the set portion 1D1 being set into the recess 1D2 is fitted into the set 1D2 to be integrated with no gap. Tighten the high strength bolt 1E. 3. With a fixed tightening torque, a predetermined high frictional force can be obtained, and a high frictional joining strength can be achieved. In FIG. 5, reference numeral 2 denotes a beam (large) base material, 3 denotes a beam (small) base material, 4 denotes a flange outer side plate steel material, 5 denotes a flange inner side plate steel material, and 6 denotes a web side plate steel material.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on embodiments with reference to the drawings. 1 is a high friction washer of the present invention. In a washer body 1C in which a bolt through hole 1B is opened at the center of the disc-shaped 1A, the one contact pressure surface 1A1 and the other contact pressure surface 1A2 of the washer body 1C are formed with a satin-like uneven portion 1D. The concave-convex portion 1D is composed of a convex portion 1D1 and a concave portion 1D2 which are grouped adjacently. And
The convex portion 1D1 is formed in a pyramid shape protruding outward in a state parallel to the high-strength bolt 1E penetrating the bolt through-hole 1B, and the concave portion 1D2 is formed of a high-strength bolt 1E penetrating into the bolt through-hole 1B. Are formed in the shape of an inverted pyramid which is depressed inward in a state parallel to. The washer body 1C is made by forging or casting, and is hardened by special steel or quenching. The washer body 1C is configured as a donut-shaped disk.

[0007]

EXAMPLE The washer body 1C has a thickness of about 4 mm as a standard thickness, and a through hole 1B for a high-strength bolt is made larger by about 1 mm than the diameter of the high-strength bolt. The contact pressure surface due to the high-strength bolt tightening varies depending on the diameter of the high-strength bolt, the thickness of the attached steel plate, and the like. The coefficient of friction is intended to be increased by the uneven portion having a pear-like shape. Width 1c for stabilization of washer body 1C in the form of an outer ring on the outside of this uneven portion
A ring-shaped high-friction washer is formed while leaving a smooth portion of about m. The pear-shaped irregularities are formed in a pyramid shape, and the base length of the pyramid is about 3 to 4 mm. The height at the convex part of the pyramid vertex and the depth at the concave part are 1.5
mm. Since the uneven portion of the contact pressure surface portion is a portion that is embedded by the high-strength bolt tightening force between the attached steel plate and the base material, hardness is required, and the washer body is hardened by special steel or quenching, and the unevenness of the unevenness is increased. The formation is performed by forging or casting.

[0008]

Since the present invention is configured as described above, the following effects can be obtained. 1. By increasing the frictional force between the steel materials, the number of fastening high-strength bolts can be extremely reduced. A. The coefficient of friction is more than twice as large as the current general one, and the number of high-strength bolts can be reduced to about half. B. The splice plate steel material of the joint and the connection can be made smaller and lighter in the above ratio, and can be easily handled. 2. By reducing the number of high-strength bolts to be tightened,
Splice plate steel materials used for joints and connections can be miniaturized and handled.
Very convenient for transportation. Further, the labor for drilling can be extremely reduced, and a decrease in base material strength can be suppressed. 3. In order to increase the friction coefficient of the friction surface between the steel materials, elaborate processing and protection are limited to general surface treatment, and can be omitted. 4. In the case where there is a difference in the thickness between the steel materials to be connected, the construction is currently carried out using a filler steel (filler), but if various thicknesses are prepared for the high friction washer 1 of the present invention, the filling is possible. Material steel can be omitted. Filler steel (filler) in which the thickness of the steel materials to be joined is made different by a plurality of plates can be omitted by using a variable thickness high friction washer. Construction distrust caused by multiple sheets of filler steel (filler) is excluded.

[0009] 5. A steel plate for connection is provided with irregularities in a linear or annual ring shape to increase the coefficient of friction in the market. However, since it is provided on the large base plate itself, it is inconvenient for transportation and installation. However, the high friction washer 1 of the present invention
Is convenient because it can be handled like general parts such as bolts, nuts and washers, and enables easy and easy use. 6. Although the above-mentioned steel plate material has a property that must be made to order, the high friction washer 1 of the present invention can be mass-produced as an off-the-shelf product and can be a low-cost product. 7. Since the concave and convex portions 1D mechanically dig into the base steel and base metal surfaces, no special processing or protection of the friction contact pressure surface is required. 8. The high friction washer of the present invention has a certain thickness (4 m
m or more), and a bending moment is generated due to the shearing force and thickness appropriate for high-strength bolts of various diameters and strengths.
The frictional force is mainly borne by the uneven portion 1D provided on the contact bottom surface,
By providing a smooth circular portion around the periphery, a shearing force appropriate for frictional force is transmitted, and the bending moment due to the thickness is stabilized by the performance of the entire donut-shaped disk.

[Brief description of the drawings]

FIG. 1 is a plan view.

FIG. 2 is a front view.

FIG. 3 is a sectional view taken along line AA.

FIG. 4 is an enlarged view of a main part of the above.

FIG. 5 is a front view of a main part showing a use state.

FIG. 6 is a plan view of the same.

FIG. 7 is a sectional view taken along line BB.

FIG. 8 is a sectional view taken along line CC.

FIG. 9 is an enlarged sectional view of a main part taken along line DD.

FIG. 10 is an enlarged view of a main part in FIG.

FIG. 11 is an enlarged view of a main part in FIG. 5;

FIG. 12 is a longitudinal sectional view of the above.

FIG. 13 is a front view of a main part showing a use state of a conventional one.

FIG. 14 is a plan view of the same.

FIG. 15 is a sectional view taken along line EE.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High friction washer 1A Disc shape 1B Bolt through-hole 1C Washer body 1A1 One contact pressure surface 1A2 The other contact pressure surface 1D Rinchi-shaped uneven part 1D1 Convex part 1D2 Concave part 1E High strength bolt

Claims (1)

[Claims] In a washer body (1C) in which a bolt through hole (1B) is opened at the center of a disk shape (1A), one contact pressure surface (1C) of the washer body (1C) is provided.
A1) and the other contact pressure surface (1A2) are formed with a satin-like uneven portion (1D).
The protrusions (1D1) and the recesses (1D1) grouped adjacently
2), the convex portion (1D1) is formed in a pyramid shape protruding outward in a state parallel to the high-strength bolt (1E) penetrating into the bolt through hole (1B), and the concave portion (1D1).
2) is formed in the shape of an inverted pyramid depressed inward in a state parallel to the high-strength bolt (1E) penetrating into the bolt through-hole (1B), and the washer body (1C) is formed by forging or casting. High friction washer characterized by being hardened by special steel or quenching.