JP2000002226A - Protector for foundation bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a foundation bolt, which fixes a structure for an outdoor setting such as a power transmission steel tower to a foundation, such that a fixing nut threadedly engaged with the foundation bolt cannot be loosened. SOLUTION: A locking ring 4 is installed on an outer circumference of a fixing nut 2 threadedly engaged with a protruding part of a foundation bolt 1 upward from a foundation 10 such that the locking ring 4 is projected outward in a radial direction. An outside of the fixing nut 2 is covered with a cover tube 5, while plural locking pawls 5c, 5c... in a circumferential edge of a lower part of the cover tube 5 are bent inward in the radial direction so as to be engaged with the locking ring 4. Thereby, the cover tube 5 is prevented from coming off upward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protector used to protect a foundation bolt for fixing various structures on a foundation.

[0002]

2. Description of the Related Art Many architectural structures and mechanical structures are fixed via foundation bolts on a foundation constructed by casting concrete in the ground. The foundation bolt has one side buried in the foundation for an appropriate length, and is provided with an external thread portion on the other side protruding above the foundation, and fixing of a target structure is performed by fixing the foundation onto the foundation. This is achieved by clamping a part (leg) of the structure inserted into the protrusion of the bolt between the base and the base by tightening a fixing nut screwed into the male screw.

The fixing nut is provided with appropriate measures to prevent loosening due to an unavoidable external force acting after fixing. Generally, other fixing means to be screwed into the male screw portion of the foundation bolt are used. A nut (lock nut) is tightened to one side of the fixed nut to prevent loosening due to the repulsive force between the two nuts.

[0004]

The foundation structure using the foundation bolts as described above is widely used for structures installed outdoors, such as transmission towers, etc. However, in consideration of the convenience of regular maintenance work including checking the fixing condition, such as whether the fixing nut has deteriorated over time and whether the fixing nut has become loose, expose the foundation including the foundation bolts to the outside. Generally, it is in a state of being done.

[0005] However, the above-mentioned power transmission tower is often installed in a mountainous area that is hard to see, and it is vulnerable to the loosening operation of the fixing nut by artificial operation based on malicious intent. If such an operation is performed, there is a possibility that the tower will collapse with the break of the transmission line, and a serious accident such as a power failure in the surrounding area may occur. The collapse of the steel tower, which seems to be caused by such a cause, actually occurred in Kagawa Prefecture at the beginning of this year, and there is a long-awaited need for measures to reliably prevent the loosening operation of the fixing nut.

[0006] Conventionally, in some steel towers, measures have been taken to prevent the access by anyone other than those concerned by surrounding the foundation with a protective fence made of a wire mesh, and this measure has a great expense. For this reason, it is implemented only for important facilities such as a steel tower attached to the substation equipment and a steel tower for high-voltage transmission lines, and it is a fact that most of the steel towers are not provided with any measures.

[0007] For this type of foundation structure, measures to prevent loosening implemented as described above include wind, vibration, and the like.
It is effective against loosening of the fixing nut due to external force acting on the tower itself, but has no effect on the loosening operation performed directly on the fixing nut, preventing the occurrence of the accident described above. I can't get it.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is impossible to loosen a fixing bolt screwed to a foundation bolt for fixing a structure installed outdoors, such as a transmission tower, to a foundation. It is an object of the present invention to provide a protective device having a simple configuration that can reliably protect the device.

[0009]

According to the present invention, there is provided a protector for a foundation bolt according to the present invention, wherein a part of a structure is sandwiched between the foundation and the foundation by tightening a fixing nut screwed into a projection on the foundation. A protection device for protecting a base bolt to be pressure-fixed so that the fixing nut cannot be loosened. The locking ring is attached to a part of the fixing nut so as to project radially outward. It has a cylindrical shape that covers the outside of the nut,
A cover cylinder having a plurality of retaining claws at a plurality of positions in a circumferential direction thereof, the retaining claws being engaged with the locking ring by being bent inward in the radial direction.

[0010] In the present invention, a locking ring that projects outward in the radial direction is attached to a fixing nut that is screwed into a projecting portion of the base bolt onto the base and tightens and fixes the structure to the base. A cover cylinder is placed on the outside of the cover cylinder, a plurality of retaining claws provided on the cover cylinder are bent inward to engage with the locking ring, and the outside of the fixing nut is irremovably covered by the cover cylinder, and the fixing nut is fixed. To prevent loosening operation from outside.

Further, the cover cylinder is provided with a window hole formed so that the fixing nut can be seen.

In the present invention, a window hole is provided in the cover cylinder which covers the outside of the fixing nut, and the fixing state including the loosening of the fixing nut can be inspected through the window hole.

The locking ring is a ring made of an elastic material having a notch at one location in the circumferential direction. The inner diameter is expanded by expanding the notch and wound around the outer periphery of the fixing nut. There is a feature.

According to the present invention, the locking ring is constituted by a ring made of an elastic material with a part thereof being cut off, so that the locking ring can be retrofitted to an existing foundation bolt.

The locking ring is characterized in that a part of the locking ring is sandwiched between the fixed nut and a lock nut that acts to prevent the locking ring from being loosened. It is characterized in that it is integrally provided around the outside of a washer interposed therebetween.

According to the present invention, a structure to be newly fixed on a foundation is targeted, and a locking ring is sandwiched between a fixing nut and a lock nut or between a fixing nut and a structure. The cover tube is firmly attached, and the cover tube is securely prevented from coming off by engagement with the stopper claw.

Further, the locking ring is mounted so as to freely rotate around the axis of the base bolt, and furthermore, a holding nut for fittingly holding the locking ring in a freely rotatable manner is provided with the fixing nut. And a lock nut that acts to prevent loosening of the lock nut.

In the present invention, when a rotational force is applied from the outside to the cover cylinder which covers the outside of the fixing nut so that it cannot be removed, the rotational force is engaged with the retaining claw inside the cover cylinder. Absorption without transmitting to the fixing nut due to ring rotation prevents the fixing nut from being indirectly loosened by the rotation operation of the cover cylinder, and further reliably prevents the fixing nut from being loosened from the outside of the cover cylinder. . Further, a holding nut for fitting and holding such a locking ring is provided separately from the fixing nut and the lock nut, so that it can be retrofitted to the base bolt in a state of being fixedly fastened by the fixing nut and the lock nut.

Further, the locking ring has a displacing portion that is elastically displaced radially inward by contacting each of the plurality of retaining claws inside the cover cylinder when the locking ring is moved in the mounting direction. It is characterized by the following.

According to the present invention, when the cover cylinder is attached to the outside of the fixing nut, the retaining claw inside the cover cylinder comes into contact with the displacement portion provided on the locking ring attached to the fixing nut. The displacement portion elastically displaces inward in the radial direction to allow the passage of the retaining claw, and after this passage, the displacement portion returns elastically and engages with the corresponding retaining claw to prevent the cover cylinder from coming out. To be restrained. Accordingly, the cover cylinder can be attached by using a cover cylinder in which retaining claws are formed in advance, and placing the cover cylinder on the head of the foundation bolt to which the locking ring is attached.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. FIG. 1 is a perspective view showing a state before mounting a protection device (hereinafter simply referred to as a protection device) for a foundation bolt according to the present invention, and FIG. 2 is a side sectional view showing the same usage condition.

In the drawing, reference numeral 1 denotes a foundation bolt. As shown in FIG. 2, a part of the foundation bolt 1 is buried in a foundation 10 constructed by casting concrete in the ground, and a male screw is formed on an outer periphery of an upper part protruding on the foundation 10. Become
The leg 11 of the structure inserted into the upper part is clamped between the foundation 10 by tightening the fixing nut 2 screwed into the male screw part, and is used to fix the structure on the foundation 10. Can be

Reference numeral 3 in the figure denotes a lock nut. The lock nut 3 is screwed from above the fixing nut 2 to the male screw portion of the foundation bolt 1, and as shown in FIG. It is tightened on the upper part of the fixed nut 2 clamped between them, and in this state, it acts to prevent the fixed nut 2 from being loosened by the repulsive force applied between them.

The protector according to the present invention, which is used to loosen the fixing nut 2 to protect the base bolt 1 from inoperability, comprises a locking ring 4 and a cover cylinder 5. As shown in FIG. 1, the locking ring 4 is a ring-shaped member having a part cut off in the circumferential direction, is made of a metal material having a high elasticity such as spring steel, and is opposed via the missing part. Near the end, a pair of operation holes 4a, 4a are formed as through holes penetrating in the thickness direction.

The locking ring 4 configured as described above has working ends that can be fitted into the operation holes 4a, 4a, respectively, and is appropriately expanded so that the width of these working ends can be expanded. By using a jig, the missing portion can be expanded to expand the inner diameter. In this state, the base bolt 1 is inserted through the lock nut 3 to the outside of the fixed nut 2 to release the expansion. As a result, as shown by a two-dot chain line in FIG. 1, the fixing nut 2 is wound around an intermediate portion and attached in a manner to project radially outward.

As shown in FIG. 2, the inner diameter side of the locking ring 4 is reduced in thickness over the entire circumference, and is wound around the fixed nut 2 by the elastic restoring force accompanying the release of the expansion of the missing portion. When this is done, the outer surface of the fixed nut 2 is firmly gripped so that no displacement occurs in the axial direction.

On the other hand, as shown in FIG. 1, the cover cylinder 5 has a bottom having a large-diameter cylindrical portion 5b having a diameter larger than that of the small-diameter cylindrical portion 5a whose one side is closed. A plurality of retaining claws 5c, 5c,... Having an appropriate width are formed on the peripheral edge of the large-diameter cylindrical portion 5b on the opening side so as to be substantially equally distributed in the circumferential direction.

The cover cylinder 5 configured as described above covers the outside of the fixed nut 2 around which the locking ring 4 is wound and the outside of the lock nut 3 with the opening side of the large-diameter cylindrical portion 5b facing downward. Overlaid. FIG. 3 shows this state, in which the cover cylinder 5 covered on the outside of the fixing nut 2 and the lock nut 3 is fixed by the fixing nut 2 to the leg portion 11.
Are placed in a state where the tips of the retaining claws 5c, 5c...

The cover cylinder 5 covered on the outer side of the fixing nut 2 as described above, as shown by an open arrow in FIG. By applying a downward impact with the impact tool,
By folding the retaining claws 5c, 5c,... Radially inward between the upper surfaces of the legs 11, the use state shown in FIG. 2 is realized. As shown in FIGS. 1 and 3, each of the retaining claws 5c, 5c,... Is such that the distal end faces inward in a range where it does not come into contact with the locking ring 4 when the fixing nut 2 is inserted outside. , So that the inward bending caused by the impact is surely generated.

The small-diameter cylindrical portion 5a has an inner diameter slightly larger than the outer diameters of the fixed nut 2 and the lock nut 3, and when the hitting is applied in the state shown in FIG. Performs a guide action to prevent
Further, in the use state shown in FIG. 2, the cover cylinder 5 performs a function of preventing displacement in the radial direction.

In the state of use of the protective device according to the present invention obtained by mounting the locking ring 4 and the cover tube 5 as described above, as shown in FIG. 2, the tips of the retaining claws 5c, 5c. When the cover ring 5 enters the inside of the outer periphery of the locking ring 4 and is pulled upward to remove the cover cylinder 5, these retaining claws 5c, 5c,... Engage the locking ring 4 from below to prevent the removal. Therefore, it is difficult to loosen and operate the fixing nut 2 and the lock nut 3 from outside. Generally, a plurality of foundation bolts 1 are used for fixing the structure on the foundation 10. By using the protective device of the present invention for each of these, artificial loosening based on malicious intent can be achieved. The risk of operation being performed can be avoided beforehand.

In the above embodiment, a ring having a notch in the circumferential direction is used as the locking ring 4, and the fixing nut 2 is tightened as shown in FIG. Can be retrofitted, and can be easily applied to the foundation of an existing structure.

FIGS. 4 to 6 show a second embodiment of the protective equipment according to the present invention.
FIG. 4 is a perspective view showing a state before attachment, as in FIG. 1, FIG. 5 is a side sectional view showing a use state, similarly to FIG. 2, and FIG. FIG. 3 is a side sectional view showing an intermediate state in which a cover tube 5 is placed outside a fixing nut 2 similarly to FIG. 3.

The protective device shown in these figures also includes a fixing nut 2 and a lock nut 2 for screwing the leg 11 of the structure inserted into the upper part of the foundation bolt 1 projecting from the foundation 10 into the upper part of the foundation bolt 1. In the basic structure for clamping and fixing between the base 10 and the base 3 by tightening, the nut 3 is used to protect the fixing nut 2 from being loosened and cannot be loosened. It comprises a locking ring 4 attached in an aspect, and a cover cylinder 5 which is placed outside the fixed nut 2 and the lock nut 3 so as to cover them.

The locking ring 4 shown in this embodiment is different from the locking ring 4 shown in FIGS. 1 to 3 in that a shaft hole has a hollow hole 4b slightly larger than the outer diameter of the foundation bolt 1. ,
Further, a flange portion 4c is formed by bending an outer peripheral edge thereof at a substantially right angle toward one side in the axial direction, and is configured as a ring-shaped member having an L-shaped cross-sectional shape as shown in FIGS. Have been.

As shown in FIG. 4, the locking ring 4 having the above-described structure is used to lock the base bolt 1 before the lock nut 3 is screwed.
The center hole 4b is inserted into the top of the fixing nut 2 and the flange 4c is placed on the fixing nut 2 with the flange 4c facing downward. In this state, the lock nut 3 is screwed and tightened, as shown in FIGS. As described above, the peripheral portion of the hollow 4b is mounted between the fixing nut 2 and the lock nut 3.

By this attachment, the locking ring 4 can be firmly fixed without any positional displacement in the axial direction. However, since this mounting needs to be performed with the lock nut 3 not mounted, a new base 10 is required.
It is easy to apply to the structure installed on the top,
It is difficult to apply to an existing structure in which the lock nut 3 is tightened.

Further, the cover cylinder 5 shown in FIGS.
3 is a cylindrical member having substantially the same diameter over the entire length unlike the cover cylinder 5 shown in FIG.
As shown in FIG. 7, a window hole 5d is formed to be folded inward over an appropriate length, and through the folded portion, the inside can be seen. On the other hand, on the periphery of the opening on the other side, a plurality of retaining claws 5c, 5c,... Having an appropriate width are formed substantially equally in the circumferential direction, similarly to the cover cylinder 5 shown in FIGS. ing.

The cover cylinder 5 constructed as described above has the fixing nut 2 and the lock nut to which the locking ring 4 is attached as shown in FIG. 3 are placed on the outer surface of the leg 3 so as to cover them and fastened by the fixing nut 2 with the tips of the retaining claws 5c, 5c. A downward impact is applied to the opening on the other side which has been turned upward as shown by an open arrow in the drawing, so that the retaining claw 5 is located between the upper surface of the leg 11 and the upper surface.
c, 5c ... are bent inward in the radial direction. At the time of this impact, it is desirable to place a piece of wood that can cover the window hole 5d that opens upward, and to apply an even impact to the entire cover tube 5 via the piece of wood.

Each of the retaining claws 5c, 5c,..., As in the embodiment shown in FIGS. 1 to 3, is provided within a range where it does not come into contact with the locking ring 4 when the fixing nut 2 is inserted outside. The distal end is curved in advance so that it faces inward, so that the inward bending caused by the impact is reliably generated. In addition, the folded portion that surrounds the window hole 5d has an inner diameter that is slightly larger than the outer diameters of the fixed nut 2 and the lock nut 3, and when the blow is applied in the state shown in FIG. A guide action for preventing a fall is performed, and in a use state shown in FIG. 5, a shift preventing action for the cover cylinder 5 in the radial direction is performed.

As shown in FIG. 5, in the state of use of the protective device obtained by mounting the locking ring 4 and the cover tube 5 as described above, the tips of the retaining claws 5c, 5c. Inward from the outer periphery of the locking ring 4 and is opposed to a flange 4c provided around the outer periphery of the locking ring 4 from below,
When the cover cylinder 5 is pulled upward to be removed, these retaining claws 5c, 5c... Engage with the lower edge of the flange 4c to prevent the removal. It becomes difficult to loosen the lock nut 3, and the risk of an artificial loosening operation based on malicious intention can be avoided.

The locking ring 4 shown in this embodiment is clamped and fixed between the fixing nut 2 and the lock nut 3, and has a flange 4c provided around the outer peripheral edge of the locking ring 4. Since it acts as a rib for increasing the strength in the thickness direction, it can strongly resist the pulling force of the cover cylinder 5 applied through the retaining claws 5c.

The cover cylinder 5 has a window hole 5d which opens upward in the use state shown in FIG.
The lock nut 3 inside can be seen through 5d,
Inspection of the fixed state including the temporal loosening of the lock nut 3 can be performed while the mounted state of the cover cylinder 5 is maintained. As shown in FIG. 5, only a small gap exists between the inner surface of the folded portion that borders the inside of the window hole 5d and the outer periphery of the lock nut 3, and the lock nut extends from the upper portion of the window hole 5d. Operation 3 cannot be performed. The locking ring 4 and the cover cylinder 5 as described above are similar to those shown in FIGS.
Needless to say, the combination can be changed as appropriate with the locking ring 4 and the cover cylinder 5 shown in FIG.

FIGS. 7 and 8 are side sectional views showing the third and fourth embodiments of use of the protector according to the present invention. The embodiment shown in FIG. 7 uses an expandable locking ring 4 as shown in FIGS. 1 to 3, and a wedge-shaped inner peripheral edge of the locking ring 4 is fixed to the fixing nut 2 and the lock nut 3. Are fitted and engaged with gaps formed on the outer periphery of the boundary portion. The illustrated cover tube 5 that covers the outside of the fixed nut 2 and the lock nut 3 is the same as the cover tube 5 shown in FIGS. 1 to 3, but has a window hole 5 d at the top as shown in FIGS. 4 to 6. May be used.

In this embodiment, while using the locking ring 4 that can be retrofitted to the existing base, the movement of the locking ring 4 in the axial direction after the attachment is reliably restrained, and the cover cylinder 5 It is possible to strongly resist the removal of the sheet. However, the locking ring 4 attached in this manner is opposed to the retaining claws 5c, 5c,... Bent inward at the lower part of the cover tube 5 with a distance therebetween, as shown in the drawing. A spacer ring 6 is interposed below the locking ring 4, and the retaining claws 5 c, 5 c... Come into contact with the locking ring 4 via the spacer ring 6 when the cover cylinder 5 is pulled up.

The lower edge of the spacer ring 6 is provided with a flange 6a which is inclined slightly upward and projects outward. The flange 6a is bent by hitting the upper portion of the cover tube 5 as described above. The tips of the retaining claws 5c, 5c ... are received in the lower part of the flange 6a.

In the embodiment shown in FIG. 8, the peripheral edge of the washer 7 interposed between the lower surface of the fixing nut 2 and the upper surface of the leg 11 to be fastened by this is connected to the upper surface of the leg 11. By projecting outward with a gap therebetween, a locking ring 4 is formed integrally with the washer 7, and at the lower edge of the cover cylinder 5 that covers the outside of the fixed nut 2 and the lock nut 3. The distal ends of the retaining claws 5c, 5c,... Bent inward are received in the lower position of the locking ring 4. The illustrated cover tube 5 is the cover tube 5 shown in FIGS.
However, as shown in FIGS. 4 to 6, it is also possible to use a cover cylinder 5 having a window hole 5d formed in the upper part.

In this configuration, the locking ring 4 is firmly restrained at the lower portion of the fixed nut 2, and the cover cylinder 5 can be reliably prevented from falling off by the retaining claws 5c, 5c,. The locking ring 4 also serves as a washer 7 originally required for securely fastening the fixing nut 2, and the number of parts can be reduced. However, in order to realize this configuration, it is necessary to remove the fixing nut 2, so that it is difficult to apply it to the foundation of an existing structure.

FIG. 9 is a side sectional view showing the use state of the fifth embodiment of the protective equipment according to the present invention. In the embodiment shown in this figure, a part of the peripheral surface of the cover cylinder 5 that covers the outside of the fixed nut 2 and the lock nut 3 is bent inward to form a plurality of retaining claws 5c, 5c. Fixing nut 2
The cover cylinder 5 is prevented from coming off by engaging the locking ring 4 projecting outward from the lower side from the lower position, and the upper portion of the foundation bolt 1 is protected from being loosened by the fixing nut 2.

FIG. 10 is a perspective view showing the appearance of the cover tube 5 shown in FIG. 9, FIG. 10 (a) shows a state before the retaining claws 5c, 5c... Are bent, and FIG. , Respectively, showing the state after bending. As shown in FIG. 10 (a), the middle part of a pair of horizontal sides parallel to the lower edge is connected to the peripheral wall of the cover cylinder 5 by a vertical side at a position away from the lower edge by a predetermined length in the height direction. Are formed at four places in the circumferential direction (only two places are shown in the figure), and the retaining claws 5c, 5c ... press on both sides of the vertical side. By folding the part sandwiched between the horizontal sides inward,
It is formed as shown in FIG.

The retaining claws 5c, 5c,... Are formed so that the cuts formed at positions opposed to each other in the radial direction can be clamped from the outside of the cover cylinder 5 and an inward force can be applied thereto. It can be realized using an appropriate jig.

The retaining claws 5c, 5c,.
The locking ring 4 engaged with the inside of the cover cylinder 5 in FIG.
As shown in the figure, the peripheral edge of the washer interposed between the fixed nut 2 and the lock nut 3 is extended outwardly over an appropriate width to be integrally formed with the washer. The positions where the claws 5c, 5c,... Are formed are as follows: when the upper edge of each of the claws 5c is placed on the upper surface of the leg 11 to be fixed, the cover cylinder 5 is placed on the lower surface of the locking ring 4. Are set to face each other.

The cover tube 5 thus configured is the same as that shown in FIG.
As shown in the figure, the upper part of the base bolt 1 to which the fixing nut 2 and the lock nut 3 are tightened can be covered with almost no gap between the base bolt 1 and the upper surface of the leg 11. Thereby, for example, the cover tube 5 is pushed up by means of pushing up the cover tube 5 with a bur having a tip inserted into the gap.
Is difficult to remove.

Further, between the inner surface of the cover tube 5 and the fixed nut 2 and the lock nut 3, spacer cylinders 7a and 7b each having a short cylindrical shape are interposed so as to fill the annular gap therebetween. However, these prevent the cover tube 5 from falling down due to an impact applied from the outside in the use state shown in FIG. 9, and make it more difficult to remove the cover tube 5. With such a configuration, it is possible to more reliably prevent the loosening operation of the fixing nut 2 due to malicious intention.

FIG. 11 is a side sectional view showing a use state of the sixth embodiment of the protective equipment according to the present invention, and FIG. 12 is a perspective view showing an appearance of a cover tube 5 used in this embodiment. FIG. In this embodiment, as in the embodiment shown in FIGS. 9 and 10, a part of the peripheral surface of the cover tube 5 is bent inward to form a plurality of retaining claws 5c, and these are fixed. The cover ring 5 is prevented from coming off by engaging the locking ring 4 projecting outside the nut 2 from the lower position from the lower position, and the upper part of the foundation bolt 1 is protected so that the fixing nut 2 cannot be loosened. The difference from the fifth embodiment shown in FIGS. 9 and 10 lies in the formation of the retaining claws 5c.

FIG. 12 (a) shows a state before the retaining claws 5c are bent, and FIG. 12 (b) shows a state after the bending. As shown in FIG.
The peripheral wall has a gate-shaped structure formed by connecting a downward vertical side substantially perpendicular to this side on both sides of a horizontal side parallel to the lower edge at a position separated from the lower edge by a predetermined height in the height direction. Notches are provided at four locations in the circumferential direction (only two locations are shown in the figure), and the retaining claws 5c, 5c,. Accordingly, as shown in FIG. 12B, the upper part of the cut is formed to protrude inward.

When the cover cylinder 5 is placed on the upper surface of the leg portion 11 to be fixed and the retaining claws 5c, 5c... Are bent, the retaining claws 5c, 5c. As shown in (1), the upper edge is set to be opposed to the lower surface of the locking ring 4 with a slight gap. Further, between the inner surface of the cover tube 5 and the fixed nut 2 and the lock nut 3, spacer cylinders 7a and 7b each having a short cylindrical shape are interposed so as to fill an annular gap therebetween. However, in the use state shown in FIG. 11, the cover cylinder 5 is prevented from falling down due to an impact applied from the outside.

With the above configuration, the cover cylinder 5 shown in FIGS. 11 and 12 is difficult to remove from the outside similarly to the cover cylinder 5 shown in FIGS. 9 and 10, and the loosening operation of the fixing nut 2 based on malicious intent is made easier. It can be reliably prevented.

FIG. 13 is a perspective view of a main part showing an example of a jig used to fold the retaining claws 5c shown in FIG. The jig 8 is used by being attached to a head portion H of a crimping tool used for attaching a crimp terminal to an end of a wiring in electric wiring work.
A support fitting having a support hole 80 having a hole diameter corresponding to the outer diameter of the cover cylinder 5 in the center thereof
81, and a pressing piece 83 attached to the working end 82 of the head portion H projecting into the support hole 80.

The working end 82 of the head portion H to which the pressing piece 83 is attached advances and retreats on the radial line of the support hole 80 by the operation of a hydraulic or electric drive source (not shown) attached to the head portion H. It is done. The folding of the retaining claws 5c, 5c,... Using the jig 8 is performed by covering the support fitting 81 on the outside of the cover cylinder 5 with the pressing piece 83 retracted. The retaining claws 5c on the circumference of the cylinder 5
.. Are positioned in the circumferential direction such that the tip of the pressing piece 83 is aligned with any of the formation positions, and the pressing piece 83 is caused to protrude while supporting the other side of the cover cylinder 5 by the inner surface of the support hole 80. This can be easily realized by pressing the corresponding formation portion of the retaining claw 5c from outside.

The pressing piece 83 shown in FIG. 13 is configured as a cutting blade having a predetermined width in the circumferential direction of the support hole 80, and by using such a pressing piece 83, the peripheral surface of the cover cylinder 5 is formed. This notch can be bent to form the retaining claw 5c while forming the notch in the hole, and as shown in FIG. 12, there is no need to previously form a gate-shaped notch, An appropriate number of retaining claws 5c, 5c,...

FIG. 14 is a side sectional view showing a use state of the seventh embodiment of the protective equipment according to the present invention. The protector shown in this figure is similar to the protectors shown in the first to sixth embodiments, except that the leg 11 of the structure inserted into the upper part of the base bolt 1 protruding from the base 10 is attached to the base bolt. In a basic structure in which the fixing nut 2 and the lock nut 3 screwed to the upper portion of the base 1 are clamped and fixed between the base 10 by tightening the fixing nut 2, the fixing nut 2 is used to protect the fixing nut 2 from being undone. It comprises a locking ring 4 attached to a part of the nut 2 so as to protrude outward in the radial direction, and a cover cylinder 5 which covers the fixing nut 2 and the lock nut 3 so as to cover them. .

The cover cylinder 5 has a bottomed cylindrical shape, and is provided with a plurality of retaining claws 5c, 5c,.
To protect the upper part of the foundation bolt 1 from being unfastened by loosening the fixing nut 2. The stopper pawls 5c press the gate-shaped cuts at a plurality of positions in the circumferential direction provided at the corresponding positions from the outside, similarly to the cover tube 5 shown in the sixth embodiment, and the upper edge thereof. The part is formed to protrude inward.

The feature of this embodiment resides in the manner in which the locking ring 4 is attached.
Are fitted and held by a holding nut 9 which is fastened and fixed to the top of the holding nut 9. The holding nut 9 is provided with a small-diameter fitting part 9a coaxially connected to one side thereof. The fitting part 9a is provided on the top of the base bolt 1 to which the fixing nut 2 and the lock nut 3 are screwed. The nut 9a is screwed down, and is fastened and fixed so that the end face of the fitting portion 9a is in contact with the upper surface of the lock nut 3.

As in the case of the locking ring 4 used in the second embodiment shown in FIGS. 4 to 6, the locking ring 4 is formed by pivoting the outer peripheral edge of a disk having a hollow 4b in the shaft center. A flange 4c is provided by being bent at a substantially right angle toward one side in the longitudinal direction, and is configured as a ring having an L-shaped cross section.The fitting portion 9a of the holding nut 9 is inserted through the hollow hole 4b, Retaining nut 9
And the lock nut 3 is attached with the flange 4c facing downward.

The hollow hole 4b of the locking ring 4 is a circular hole having a slightly larger diameter than the fitting portion 9a of the holding nut 9, and the thickness of the locking ring 4 is equal to that of the fitting portion 9a. The length of the retaining ring 4 is set smaller than the axial length, and the locking ring 4 attached as described above is not fitted between the opposing surfaces of the retaining nut 9 and the lock nut 3, and the fitting portion 9a of the retaining nut 9 is not pressed. , The rotation of the base bolt 1 around the axis is possible, and only the movement in the axial direction is restricted between the opposing surfaces of the holding nut 9 and the lock nut 3.

With the above configuration, in the protective device shown in FIG. 14, when a force is applied from the outside to pull the cover cylinder 5 upward, the retaining claws 5c, 5c,.
The upper edge of the cover cylinder 5 abuts against the flange 4c of the locking ring 4 from below and pushes it up, and the locking ring 4 abuts the lower surface of the holding nut 9, whereby the cover cylinder 5 is irremovably restrained. As a result, the loosening operation of the fixing nut 2 based on malicious intention can be reliably prevented.

The collar 4c provided around the locking ring 4
Is opposed to the inner surface of the cover cylinder 5 with a slight gap, and has an effect of preventing the cover cylinder 5 from falling down due to an impact applied from the outside. Further, since the locking ring 4 is held by the holding nut 9 so as to be rotatable around the axis, even when a turning force is applied from outside to remove the cover cylinder 5, this turning force is applied to the holding nut 9. There is no fear that the retaining nut 9 is absorbed by the idle rotation of the locking ring 4 and loosened. Accordingly, it becomes more difficult to remove the cover cylinder 5 from the outside, and the loosening operation of the fixing nut 2 based on malicious intention can be more reliably prevented.

In FIG. 14, the locking ring 4 is held by a holding nut 9 provided separately from the fixing nut 2 and the lock nut 3. 2 or a part of the lock nut 3. However, in this case, the fixing ring 4 is attached to the fixing nut 2 or the lock nut 3.
Therefore, it is difficult to apply the method to an existing structure in which both nuts 2 and 3 are tightened.

FIG. 15 is a side sectional view showing the use state of the eighth embodiment of the protective equipment according to the present invention. The protective equipment shown in this figure is similar to the protective equipment shown in the first to seventh embodiments.
The leg 11 of the structure inserted into the upper part of the foundation bolt 1 protruding from the foundation 10 is tightened by the fixing nut 2 and the lock nut 3 screwed into the upper part of the foundation bolt 1.
And used to protect the fixed nut 2 from being loosened so as to prevent the loosening operation of the fixed nut 2, and to a part of the fixed nut 2 which is mounted so as to project radially outward. Retaining ring 4 and fixing nut 2
And a cover cylinder 5 which is provided outside the lock nut 3 so as to cover them.

The cover cylinder 5 is, like the cover cylinder 5 shown in the sixth and seventh embodiments, an upper edge of a gate-shaped cut provided at a predetermined distance from the opening side edge of the bottomed cylinder. Are provided in the circumferential direction by protruding inward, and these are engaged with the locking ring 4 from below so that the upper part of the foundation bolt 1 cannot be loosened by the fixing nut 2. It is configured to be protected.

Further, similarly to the seventh embodiment, the locking ring 4 is freely rotatably held by a small-diameter fitting portion 9a connected to a holding nut 9 which is fastened and fixed to the upper surface of the lock nut 3. The engagement with the cover cylinder 5 is maintained against the upward pulling force and the rotational force applied around the shaft in the use state, and the cover cylinder 5 is irremovably restrained. .

The feature of this embodiment resides in the configuration of the locking ring 4 that performs the above-described operation. The locking ring 4 has an annular shape in which a recess is formed on one side over the entire circumference. A lower ring 40 to be formed, an upper ring 41 attached to the lower ring 40 so as to close the opening side of the recess, and a displacement spring 42 incorporated inside the recess so as to be elastically displaceable in a radial direction. It is provided with.

FIG. 16A is an exploded perspective view of the locking ring 4, and FIG. 16B is a perspective view showing the assembled state. As shown in the figure, the lower ring 40 is provided with an inner flange 43 and an outer flange 44 by bending the inner and outer peripheries of the hollow disk toward one side in the axial direction at substantially right angles to provide an inner flange 43 and an outer flange 44. It is a ring of U-shaped cross section formed with a recess for accommodating the spring 42. At four locations in the circumferential direction, notches 45, 45. Is formed.

The upper ring 41 is provided on the inner ring of the lower ring 40.
A hollow hole disc-shaped member having a hollow hole 46 at the center thereof capable of being fitted to the outside of 43 and having an outer diameter substantially equal to the outer flange 44 of the lower ring 40. Lower ring
40, four notches 47, 47,... Corresponding to the notches 45, 45,.

Further, the displacement spring 42 is formed by forming a narrow band made of a metal material having high elasticity such as spring steel into a multiple spiral shape, and as shown in FIG. It is configured as a spring having a large outer diameter. The displacement spring 42 configured as described above can be elastically deformed so as to reduce the outer diameter by the action of a force from the outer peripheral side, and as shown by arrows in FIG. It is pushed into the recess formed between the edges 43 and 44 and housed.

As described above, the locking ring 4 is provided with the upper ring 41 above the lower ring 40 housing the displacement spring 42, the notches 45, 45... And the notches 47, 47 of the latter. Are positioned and placed so that they are aligned in the circumferential direction, and FIG. 16 (b)
As shown in the figure, the lower ring protrudes above the upper ring 41
The lower ring 40 and the upper ring 41 are integrated with each other by caulking the tip of the inner flange 43 of the 40 inward in the radial direction.

On the outer periphery of the locking ring 4 configured as described above, the notches 45, 45,... Provided on the lower ring 40 and the upper ring 41, respectively, and the notches 47, 47,. And four openings are formed in the lower ring.
The displacement springs 42 housed in the recesses 40 are exposed to the outside from each of these openings, and can be elastically displaced radially inward by an external force applied to these exposed portions.

FIGS. 17 (a) and 17 (b) are views for explaining the operation of the locking ring 4. FIG. When this locking ring 4 is used, a cover cylinder 5 in which retaining claws 5c, 5c... Are formed in advance outside the fixed nut 2 and the lock nut 3 to which the locking ring 4 is attached, The use state shown in FIG. 15 can be obtained. As described above, the locking ring 4 is provided with exposed portions of the displacement spring 42 at four locations on the outer periphery, and the projected portions of the cover cylinder 5 and the retaining claws 5c are aligned with the exposed portions. In this state, when a downward pushing force is applied as indicated by an arrow in the drawing, the displacement spring 42 in contact with the retaining claw 5c is pressed inward in the radial direction. 17 (b), it is displaced inward as shown by the white arrow to allow the retaining claw 5c to pass through.

When the retaining claw 5c passes through the exposed portion of the outer periphery of the locking ring 4, the displacement spring 42 is released from contact with the retaining claw 5c and elastically returns outward in the radial direction. Is kept in contact with the outer flange 44 of the lower ring 40.
The outer diameter of the resiliently restored displacement spring 42 is sufficiently larger than the inner diameter of the retaining claw 5c as shown in FIG. 15, and when an upward pulling force is subsequently applied to the cover cylinder 5, the retaining claw 5c Is engaged with the lower surface of the displacement spring 42 or the lower ring 41,
The locking ring 4 pushed up by this makes the fixing nut 9
By contacting the lower surface of the cover cylinder 5, the cover tube 5 is restrained from falling out.

As described above, in the above embodiment, since the locking ring 4 is provided with the displacement portion (displacement spring 42) which can be elastically displaced radially inward, the retaining claws 5c, The cover cylinder 5 formed with 5c... Can be retrofitted by covering the head of the base bolt 1 to which the locking ring 4 is attached. Therefore, as in the other embodiments, the retaining claws 5c, 5c,
It is no longer necessary to form 5c ..., and the intended purpose is to loosen the fixing bolt 2 on the head of the foundation bolt 1 to protect it from operation by two-step operation of putting the cover cylinder 5 after attaching the locking ring 4. Can be easily achieved.

It is needless to say that the displacement portion provided on the locking ring 4 is not limited to the displacement spring 42 shown in the figure, but may have any configuration as long as it can be elastically displaced radially inward.

[0083]

As described in detail above, in the protection device for a foundation bolt according to the present invention, a locking ring projecting outward in the radial direction is attached to a fixing nut screwed to the foundation bolt protruding above the foundation. A cover cylinder is placed over the outside of the fixing nut, and a retaining claw formed by bending a part of the cover cylinder inward at a plurality of locations in the circumferential direction is engaged with the locking ring. Is covered with a cover cylinder so that it cannot be removed.This makes it possible to protect the foundation bolts of the structure so that the fixing nut cannot be loosened, even with a simple structure. It is possible to avoid it effectively and prevent the collapse of the structure from occurring.

Further, since the window hole is provided in the cover cylinder which covers the outside of the fixing nut, it is possible to easily inspect the fixing state including the loosening of the fixing nut through the window hole.

Further, since the locking ring is formed by a ring made of an elastic material having a notch at one location in the circumferential direction, it is possible to expand the inner diameter by expanding the notch and mount it around the outer periphery of the fixing nut. It becomes possible to retrofit existing structures to foundation bolts.

Also, since the locking ring is clamped between the fixing nut and the lock nut or between the fixing nut and the structure, it is firmly mounted in which the movement of the locking ring after the mounting is securely restrained. Thus, it is possible to reliably prevent the cover tube from coming off, and it is possible to more effectively avoid the danger of the loosening operation of the fixing nut due to malicious intention.

Further, since the locking ring is attached so as to freely rotate around the axis of the base bolt, the rotational force applied from the outside to the cover cylinder is absorbed by the rotation of the locking ring, and the fixing nut is rotated by rotating the cover cylinder. Is not indirectly loosened, and removal of the cover cylinder can be prevented more reliably. In addition, because the freely rotatable locking ring is fitted and held on the holding nut provided separately from the fixing nut and the lock nut, it can be retrofitted to existing equipment where the fixing nut and the lock nut are tightened. It becomes possible.

Further, since the locking ring having the above-mentioned function is provided with a displacement portion which comes into contact with the retaining claw when the cover cylinder is moved in the mounting direction and is elastically displaced inward in the radial direction, the locking ring is provided. It is said that the procedure of placing a cover cylinder with a retaining claw formed in advance on the head of the foundation bolt to which it has been attached makes it easy to install it on existing equipment and prevents the artificial loosening operation of the fixing nut due to malicious intent. The present invention has excellent effects such that the intended purpose can be easily achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state before a protective device according to the present invention is attached.

FIG. 2 is a side sectional view showing a use state of the protector according to the present invention.

FIG. 3 is a side sectional view showing an intermediate state in which a cover cylinder is placed outside a fixing nut in the protective equipment according to the present invention.

FIG. 4 is a perspective view showing a state before attachment of a protector according to a second embodiment of the present invention.

FIG. 5 is a side sectional view showing a state of use of the protection device shown in FIG. 4;

FIG. 6 is a side sectional view showing an intermediate state in which a cover cylinder is placed outside a fixing nut in the protective device shown in FIG. 4;

FIG. 7 is a side sectional view showing a use state of a third embodiment of the protective equipment according to the present invention.

FIG. 8 is a side sectional view showing a use state of a fourth embodiment of the protective equipment according to the present invention.

FIG. 9 is a side sectional view showing a use state of a fifth embodiment of the protective equipment according to the present invention.

FIG. 10 is a perspective view showing an appearance of a cover tube used in the embodiment shown in FIG.

FIG. 11 is a side sectional view showing a use state of a sixth embodiment of the protective equipment according to the present invention.

FIG. 12 is a perspective view showing an appearance of a cover tube used in the embodiment shown in FIG.

FIG. 13 is a perspective view of a main part showing an example of a jig used for folding a retaining claw of the cover cylinder shown in FIG. 12;

FIG. 14 is a side sectional view showing a use state of a seventh embodiment of the protective equipment according to the present invention.

FIG. 15 is a side sectional view showing a use state of an eighth embodiment of the protective equipment according to the present invention.

FIG. 16 is a perspective view of a locking ring used in the embodiment shown in FIG.

FIG. 17 is an operation explanatory view of the locking ring shown in FIG. 16;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foundation bolt 2 Fixing nut 3 Lock nut 4 Locking ring 5 Cover cylinder 5c Retaining claw 5d Window hole 40 Lower ring 41 Upper ring 42 Displacement spring

Claims (8)

[Claims] 1. A bolt for clamping and fixing a part of a structure between the foundation and the base by tightening a fixing nut screwed to a protrusion on the foundation so that the fixing nut cannot be loosened. A protective device for protecting, wherein a locking ring attached to a part of the fixing nut in a manner protruding outward in the radial direction, and a cylindrical shape covering an outer side of the fixing nut, and A cover for a base bolt, comprising: a cover cylinder having a plurality of retaining claws which engage with the locking ring by bending at a plurality of positions in a circumferential direction thereof. 2. The base bolt protection device according to claim 1, wherein the cover cylinder includes a window hole formed so that the fixing nut can be seen. 3. The locking ring is a ring made of an elastic material having a notch at one position in a circumferential direction, and is expanded around the notch to expand the inner diameter and wind around the outer periphery of the fixing nut. The protection device for a foundation bolt according to claim 1 or 2, wherein the protection device is a base bolt. 4. The foundation bolt according to claim 1, wherein said locking ring is partially fitted between said fixing nut and a lock nut which acts to prevent loosening thereof. Protective equipment. 5. The protection of a foundation bolt according to claim 1, wherein the locking ring is integrally provided around a washer interposed between the fixing nut and a structure. Utensils. 6. The locking ring according to claim 1, wherein the locking ring is freely rotatable around an axis of the foundation bolt.
Protective equipment for the foundation bolt described. 7. The protection device for a base bolt according to claim 6, wherein a retaining nut for fittingly retaining the retaining ring is provided separately from the fixing nut and a lock nut for preventing the fixing nut from loosening. . 8. The locking ring includes a displacing portion that is elastically displaced radially inward by contacting each of a plurality of retaining claws inside the cover cylinder when the locking ring moves in the mounting direction of the cover cylinder. The protection device for a foundation bolt according to any one of claims 1 to 7, comprising: