JPH10184652A - Fall preventing member and method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce danger such as fall of a bolt or a nut by providing at least two holding parts formed so as to be fitted to the head part of a bolt and a nut, and connecting the each holding parts to the other any holding part. SOLUTION: This fall preventing member is formed so that it is fitted to bolts and nuts by tightening force of annular holding parts 2 corresponding to the sizes of the bolt head part 30 and the nut to be prevented from falling and intended to contract by elastic return, and a plurality of the holding parts 2 are in order of adjoining one connected together through connecting parts 4. The member is integratedly molded out of elastic material, ethylenepropylene series rubber material and the like are used, material of excellent relaxation characteristic of permanent strain and weather resistance is desirable, and usability is improved by making the connecting part 4 a little softer than the holding part 2. When the member is fitted to the bolt head parts 30, even if some bolt would be broken and broken away, displacement over a fixed quantity can be restrained by restraint from the adjoining other holding part 2. Hence, danger such as fall of a bolt or a nut can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member for preventing a bolt or a nut from falling and a method for preventing the member from falling.

[0002]

2. Description of the Related Art Bridges (for example, road viaducts and railway bridges)
As shown in FIG. 8, bolts 3 and nuts are connected to beams and girder joints of structures such as buildings and buildings (for example, buildings), but these bolts 3 and nuts are exposed in a bare state. May be. This exposed bolt 3
It is very dangerous since the nuts and nuts may break or loosen under shearing force due to the repeated vibrations of the structure and fall off and fall on sidewalks, roadways or private houses, causing accidents and damage.

In order to avoid this danger, use is made of bolts 3 of sufficient strength in consideration of the safety factor in design to suppress the breakage, and similarly, the nut itself is devised to prevent loosening from the bolts 3. . However, due to various conditions such as the usage environment,
Actually, the bolt 3 may be broken or the nut may be loosened.

[0004] Therefore, usually, the bolts 3 and nuts are regularly inspected for fatigue and the like, and those having defects are replaced. However, there is still a risk of falling off before the inspection time has arrived.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a member for preventing a fall or a method for preventing the fall of a bolt or a nut which can reduce the risk of falling.

[0006]

In order to solve the above-mentioned problems, the present invention employs the following technical means.

[0007] The fall prevention member of the present invention includes at least two grip portions formed so as to correspond to and be attached to a head or a nut of a bolt whose fall is to be prevented, and to each of the grip portions. Is characterized in that it is in a connected state with any other gripping part. It may be formed integrally with an elastic material.

When each of the holding portions of the drop prevention member is attached to the head or the nut of the corresponding bolt, even if any of the bolts breaks or the nut is loosened and tries to disengage, the head of the bolt or the nut is removed. The displacement from a certain level or more can be suppressed by restraint from another gripping part connected to the gripping part attached to the nut.

According to the fall prevention method of the present invention, a curable adhesive is applied between the heads or nuts of the bolts to prevent the fall, and the range in which these can be relatively displaced is limited. It is characterized by.

When a curable adhesive is applied between the heads of the bolts or the nuts according to this drop prevention method, even if one of the bolts breaks or the nut is loosened and tries to come off, the other bolt heads are removed. Alternatively, the range that can be relatively displaced by the curable adhesive applied between the nut and the nut can be limited.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the drawings showing embodiments.

As shown in FIGS. 1 to 6, a fall prevention member 1 of this embodiment has a plurality of gripping portions 2 connected in order. The grip portion 2 is formed in a ring shape with a slightly smaller diameter so as to correspond to the head portion 30 or the nut of the bolt 3 to be prevented from falling and to be attached thereto. That is, it is formed so as to correspond to the size of the head 30 or the nut of the bolt 3 for which the fall is to be prevented, and to be attached thereto by the tightening force of the annular grip portion 2 which is elastically restored and contracts. Instead of an annular shape, it may be formed in the same shape (hexagonal shape) as the contour of the bolt 3 or nut to be attached.

In this embodiment, the plurality of grips 2 are sequentially connected to the adjacent grips by the link 4, but it is sufficient if at least two grips 2 are provided. Further, depending on the arrangement of the bolts 3 and nuts to be prevented from falling, it is also possible to make a connection state with any other grip part 2 instead of the adjacent grip part 2.

The drop prevention member 1 is integrally formed of an elastic material. In this embodiment, an ethylene propylene rubber material is used as the elastic material. However, other known rubbers and elastomers can be selected. Here, since the fall prevention member 1 is usually used for a long period of time, an elastic material having excellent permanent strain relaxation characteristics is preferable. Further, since it is often used in a state of being exposed to an external environment such as a bridge, an elastic material having excellent weather resistance is preferable. Further, if the connecting portion 4 is formed to be slightly softer by changing the composition of the grip portion 2 and the rubber material, the usability is good.

In this embodiment, in order to correspond to the high tension bolt 3 and the nut of M-22, the inner diameter of the annular grip portion 2 is 36 mm, its outer diameter is 42 mm, and its width is 7 mm.
The cross-sectional dimension of the connecting part 4 was set to 5 mm square, and the distance between the gripping parts 2 (the center of both sides) was set to 85 mm so as to correspond to the distance between the bolts 3 and the nuts to prevent falling.

In this embodiment, the entirety of the fall prevention member is integrally formed of a rubber material. However, it is not always necessary that the entirety of the fall prevention member be an elastic body, and only each grip portion 2 is formed of an elastic material. May be connected with a metal material or the like.

Next, the usage of the fall prevention member 1 will be described. As shown in FIGS. 4 to 6, the fall prevention member 1 having the above structure is attached to the head 30 of the bolt 3 fixed to the joining plate 5 of a seam such as a bridge (only the surface on the bolt 3 side). And the nut side is not shown). Then, even if one of the bolts 31 breaks (or the nut is loosened) due to various conditions such as the use environment and tries to be removed, this bolt 3
Grip 2 attached to the head 30 (or nut) of the
Due to the constraint from the other gripping part 2 adjacent to the gripping part 2 in a connected state, the displacement of a certain degree or more can be suppressed. In other words, the bolt 3 or the nut to be disengaged can be restrained from being displaced by a certain amount or more by the restraint from the other gripping part 2 which is connected to the gripping part 2 attached thereto. There is an advantage that danger can be reduced.

FIG. 7 shows another embodiment of the fall prevention member 1 according to the present invention. The difference from the above embodiment will be mainly described. In this embodiment, since the connecting portions 4 between the gripping portions 2 are connected in a zigzag shape, even if there is a slight difference in the interval between the bolts 3 and the nuts, it is possible to further cope with the expansion and contraction.

Next, an embodiment of the fall prevention method of the present invention will be described (not shown). A curable adhesive is applied between the bolt heads or nuts to prevent falling. This limits the range in which they can be relatively displaced. Then, even if one of the bolts breaks or the nut loosens and tries to come off, the range of relative displacement by the curable adhesive applied to the other bolt head or nut can be limited. Therefore, there is an advantage that the danger of falling of the bolts and nuts can be reduced even by this method.

[0020]

The present invention has the above-described configuration and has the following effects.

Since the bolt or the nut to be detached can be restrained from being displaced by a certain amount or more by restraining it from the other gripping portion connected to the gripping portion attached to the bolt or the nut,
It is possible to provide a fall prevention member that can reduce the risk of the bolts and nuts falling.

Since the range of relative displacement can be limited by the curable adhesive applied between the bolt head and the nut, a drop prevention method that can reduce the danger of the bolt or nut falling is provided. You can do it.

[Brief description of the drawings]

FIG. 1 is a front view illustrating an embodiment of a fall prevention member according to the present invention.

FIG. 2 is a bottom view of the fall prevention member of FIG. 1;

FIG. 3 is a partially enlarged perspective view of the fall prevention member of FIG. 1;

FIG. 4 is a partial cross-sectional view illustrating a use state of the fall prevention member of FIG. 1;

FIG. 5 is a partial front view illustrating a use state of the fall prevention member of FIG. 1;

FIG. 6 is a perspective view illustrating a use state of the fall prevention member of FIG. 1;

FIG. 7 is a partially enlarged perspective view illustrating another embodiment of the fall prevention member of the present invention.

FIG. 8 is a perspective view illustrating a connection state of a joint of a structure.

[Explanation of symbols]

 2 Gripping part 3 Bolt 30 Head

Claims (3)

[Claims] At least two gripping portions are provided corresponding to and attached to a head or a nut of a bolt whose fall is to be prevented, and each of the gripping portions is any other gripping portion. A member for preventing fall, which is in a connected state with a part. 2. The fall prevention member according to claim 1, wherein the member is integrally formed of an elastic material. 3. A fall prevention method, wherein a curable adhesive is applied between the heads or nuts of the bolts to prevent the fall, thereby limiting the range in which these can be relatively displaced. Method.