JP6943363B2 - Exterior member mounting method - Google Patents

Description

In the present invention, a nut is screwed into an exterior member attached to a mounted portion on a side surface of a building and a bolt extending from one side of the mounted portion and inserted into a bolt insertion hole on the other side to form the exterior. The present invention relates to an exterior member mounting method for mounting a member to the mounted portion.

A method of extending the attachment of an exterior member such as an exterior panel to a mounted portion on the side of a building from one side and screwing a nut into a bolt inserted into a bolt insertion hole on the other side (in the present application, this method is referred to as "bolt". In the case of performing by "fastening"), the frictional force of the bearing surface of the bolt and nut should be as much as possible in order to exhibit suitable followability to interlayer displacement due to thermal expansion and contraction of the outer wall member and earthquake. It is important to make the size smaller so as to preferably allow displacement of the exterior member in the in-plane direction (direction perpendicular to the bolt axis direction).
However, if the tightening force of the nut with respect to the bolt is set to be small in order to minimize the frictional force on the seat surface at the bolt fastening portion, the restraint of the exterior member in the bolt axial direction becomes insufficient, and in the worst case, wind pressure, etc. Due to the vibration of the exterior member and the loosening of the nut due to the vibration, the exterior member may fall off.
Further, as a conventional method for suppressing loosening of the nut at the bolt fastening portion, a method of adopting a detent nut such as a preveling torque type (see, for example, Patent Document 1) or a double nut is adopted. A method (see, for example, Patent Document 2) is known.

Utility Model Registration No. 3163716 Japanese Unexamined Patent Publication No. 2003-138997

In order to stably attach the exterior members to the side surface of the building by bolting without being affected by aging of the building, it is necessary to prevent the nuts from loosening even under harsh conditions. .. However, the above-mentioned conventional method for preventing the nut from loosening while exhibiting suitable followability may not be able to sufficiently prevent the nut from loosening.
Further, when a double nut is used for bolt fastening, it is necessary to tighten the nut by a method called a reverse rotation method in order to prevent the nut from loosening. In such a reverse rotation method, after tightening each of the first nut and the second nut to the bolt with a specified torque, it is necessary to fix the second nut and rotate the first nut in the reverse direction by a specified amount. That is, when the reverse rotation method is adopted, it is necessary to manage the tightening torque of the first nut and the second nut, the reverse rotation torque of the first nut, etc., and the exterior member requires tightening work of many nuts. In the installation work of, there is a problem that workability deteriorates and construction management becomes complicated.

In view of this situation, the main subject of the present invention is to attach the exterior member to the side surface of the building without being affected by aging of the building when the exterior member is attached to the mounted portion on the side surface of the building by bolting. The point is to provide a technology that can be installed easily and stably.

The first characteristic configuration of the present invention is to screw a nut into an exterior member attached to a mounted portion on a side surface of a building and a bolt extending from one side of the mounted portion and inserted into a bolt insertion hole on the other side. It is an exterior member mounting method of mounting the exterior member to the mounted portion.
The nut is a double nut composed of a first nut screwed into the bolt and a second nut screwed into the bolt following the first nut.
The second nut is a preveling torque type detent nut having a friction piece for generating preveling torque on the follow-up side opposite to the advancing direction side at the time of screwing .
By manually tightening the first nut screwed into the bolt, the tightening force of the first nut is in-plane while preventing the bolt from being displaced in the bolt insertion hole in the axial direction. Displacement is within the allowable setting range
The point is that the second nut screwed into the bolt is tightened in a state where the rotation of the first nut screwed into the bolt is blocked, and the fastening by the double nut is completed.

According to this configuration, when attaching the exterior member to the attached portion on the side surface of the building by fastening the bolt, the nut to be screwed into the bolt is a double nut, and the first nut of the double nut is a general-purpose product or the like. By using the preveling torque type detent nut as the second nut, it is possible to prevent the nut from loosening while simplifying the nut tightening work. Therefore, the exterior member can be easily and stably fixed to the side surface of the building by bolting without being affected by aging of the building.
That is, by tightening the first nut so as to reduce the frictional force with generated displacement or the like of the exterior member for receiving from the building to weaken More Me Teshime, can be simplified tightening the nut. Further, in order to exhibit suitable followability to thermal expansion and contraction and interlayer displacement of the outer wall member, the frictional force of the bearing surface of the bolt and nut is minimized, and the displacement of the exterior member in the in-plane direction is preferable. Can be tolerated. The preveling torque generated by the preveling torque type detent nut as the second nut almost reliably prevents the double nut from loosening, and reliably prevents the exterior member and the bolts and nuts that fasten it from falling off. can do.

According to this configuration, the first nut tighten more weakened Me Teshime, within the above setting range of weakening a clamping force of the first nut screwed to the bolt. As a result, it is possible to prevent the bolt from being displaced in the axial direction in the bolt insertion hole and to reliably restrain the behavior of the exterior member in the axial direction. Further, it is possible to allow the bolt to be displaced in the in-plane direction in the bolt insertion hole having a diameter slightly larger than the diameter of the bolt to prevent an excessive stress from being applied from the bolt to the exterior member in the in-plane direction. can. Therefore, it is possible to prevent damage to the exterior member due to the stress.

With a normal double nut, the double nut is prevented from loosening by performing so-called wing squeezing that rotates the first nut slightly in the reverse direction when tightening the second nut. However, according to this configuration, the second nut is prevented from loosening. Since is a preveling torque type detent nut, it is possible to prevent the double nut from loosening simply by tightening the second nut while the rotation of the first nut is blocked. From this, it is possible to surely prevent the exterior member and the bolts and nuts for fastening the exterior member from falling off while further simplifying the nut tightening work.

In the second characteristic configuration of the present invention, the exterior member is an exterior panel.
The point is that the bolt insertion hole is formed by an elongated hole.

According to this configuration, since the bolt insertion hole is formed as an elongated hole, the in-plane direction (bolt axial direction) of the exterior panel in the bolt insertion hole is formed even when heat shrinkage or interlayer displacement of the exterior panel occurs. It is possible to secure so-called displacement followability such that the displacement of the bolt in the direction (perpendicular to the vertical direction) is appropriately allowed. Therefore, even if the bolt is displaced in the in-plane direction, it is possible to prevent an unreasonable stress from being applied to the exterior panel from the bolt in the in-plane direction by having the displacement followability, and the exterior panel due to the stress. Damage can be prevented.

Front view showing the bolted mounting condition of the exterior panel to the building Side view showing the schematic configuration of the attachment part of the exterior panel to the building Perspective view showing a double nut portion in a mounting portion of an exterior panel to a building Enlarged perspective view showing the screwed portion of the second nut with respect to the bolt.

An embodiment of the present invention will be described with reference to the drawings.
In the method of attaching the exterior member of the present embodiment, as shown in FIGS. 1 and 2, the exterior panel W (an example of the exterior member) is attached to the bracket 5 (an example of the attached portion) fixed to the side surface side of the building S. On the other hand, it is configured as a method of attaching by a bolt fastening portion 20.

The exterior panel W is composed of, for example, a vertically long rectangular plate-shaped member as shown in FIG. 1A, and a plurality of the exterior panels W are attached to the front side of the building S in parallel.
The exterior panel W is attached to the building S, for example, by bolt fastening portions 20 arranged at the four corners of the exterior panel W.

The bolt fastening portion 20 is configured as a portion for fastening the bracket 2 fixed to the exterior panel W and the bracket 5 fixed to the building S with bolts 21 and nuts 22 and 23.
As shown in FIG. 2, the bracket 2 fixed to the exterior panel W has a fixing plate portion 2A extending in the vertical direction along the rear surface Wa of the exterior panel W and rearward (from the lower end portion of the fixing plate portion 2A). The support plate portion 2B that is bent in the right direction in FIG. 2 and extends in the horizontal direction, and the support plate portion 2B that is bent upward from the rear end portion (the right end portion in FIG. 2) and vertically. It is configured as a substantially U-shaped metal fitting including a mounting plate portion 2C extending in the direction. Then, the fixing plate portion 2A of the bracket 2 is fixed to the rear surface Wa of the exterior panel W by the screw 1, and in that state, the mounting plate portion 2C of the bracket 2 is attached to the bracket 5 fixed to the building S with the bolt 21 and It is attached by nuts 22 and 23.

As shown in FIG. 2, the bracket 5 fixed to the building S has a fixing plate portion 5A extending horizontally along the downward mounting surface Sa provided in the building S and a front end of the fixing plate portion 5A. A mounting plate portion 5B that is bent downward from a portion (the left end portion in FIG. 2) and extends in the vertical direction, and a mounting plate portion 5B that is bent forward (to the left in FIG. 2) from the lower end portion of the mounting plate portion 5B. It is configured as a substantially Z-shaped metal fitting including a support plate portion 5C extending in the horizontal direction. Then, the fixing plate portion 5A of the bracket 5 is fixed to the mounting surface Sa of the building S by the screw 4, and in that state, the bracket 2 fixed to the mounting plate portion 5B of the bracket 5 and the exterior panel W is bolted 21. And attached by nuts 22 and 23.

A bolt 11 is fixed to the support plate portion 2B of the bracket 2 by nuts 12 and 13 with the tip of the screw portion 11a protruding downward. Then, the tip of the screw portion 11a of the bolt 11 is in contact with the upper surface of the support plate portion 5C of the bracket 5.
That is, in the support plate portion 2B, the amount of protrusion of the bolt 11 downward from the screw portion 11a can be adjusted by changing the vertical fixing position of the bolt 11 by the nuts 12 and 13. As a result, when attaching the bracket 2 fixed to the exterior panel W side to the bracket 5 fixed to the building S side, the vertical position of the bracket 2 can be easily adjusted by adjusting the protrusion amount of the bolt 11. Can be adjusted.

The bolt fastening portion 20 has the bracket 5 in a state where the rear surface of the mounting plate portion 2C of the bracket 2 fixed to the exterior panel W is in contact with the front surface of the mounting plate portion 5B of the bracket 5 fixed to the building S. It is configured to attach the bracket 2 to the.
Specifically, as shown in FIGS. 2 and 3, a round hole-shaped bolt insertion hole 2Ca formed in the mounting plate portion 2C and an elongated bolt insertion hole extending vertically extending in the mounting plate portion 5B are formed. By inserting the bolt 21 into the 5Ba from the front side and screwing the nuts 22 and 23 into the bolt 21 from the rear side, the bracket 5 and the bracket 2 are fastened by the bolt fastening portion 20.

In the bolt fastening portion 20, the nuts 22 and 23 are double nuts including a first nut 22 screwed into the bolt 21 and a second nut 23 screwed into the bolt 21 following the first nut 22. It is configured.
Further, as shown in FIG. 3, the second nut 23 is configured as a preveling torque type detent nut having a friction piece 24a for generating a preveling torque on the follow-up side (upper side in FIG. 3).
The friction piece 24a is formed on a friction ring 24 made of a highly elastic metal such as spring steel. The friction ring 24 is configured to have an annular ring portion 24b and a friction piece 24a protruding from two positions on the inner peripheral side thereof. Then, the friction ring 24 is fitted into the tubular crimped portion 23a formed on the upper surface of the second nut 23, the crimped portion 23a is bent inward, and the end portion of the crimped portion 23a is placed on the upper surface of the ring portion 24b. By abutting the friction ring 24, the friction ring 24 is fixed to the upper surface of the second nut 23 with the friction piece 24a protruding inward.
As a result, as shown in FIG. 4, when the second nut 23 is screwed into the bolt 21, the friction piece 24a engages with the thread of the bolt 21, and the frictional resistance with the thread acts as a detent. The detent torque to be exerted will be generated.

Details of the tightening work of the nuts 22 and 23 at the bolt fastening portion 20 will be described below.
First, the first nut 22 is screwed into the bolt 21 inserted into the round hole-shaped bolt insertion hole 2Ca and the long hole-shaped bolt insertion hole 5Ba. The tightening force of the first nut 22 is set so that the elongated bolt insertion hole 5Ba can be displaced in the in-plane direction while preventing the bolt 21 from being displaced in the axial direction in the bolt insertion holes 2Ca and 5Ba. It is said to be within the range. Since the setting range of such a tightening force is relatively weak (small), the operator can tighten the first nut 22 by hand tightening or the like.

Next, the second nut 23 configured as the preveling torque type detent nut is screwed into the bolt 21 to which the first nut 22 is tightened. The second nut 23 is tightened to a specified torque while the rotation of the first nut 22 is blocked. Then, by tightening the second nut 23, the fastening with the double nut is completed, and it is not necessary to rotate the first nut 22 in the reverse direction.
The second nut 23 tightened in this way is strong due to the synergistic effect of the detent torque generated between the threads of the bolt 21 and the frictional force generated between the first nut 22. The detent work will be exerted, and the loosening of the nuts 22 and 23 will be almost certainly prevented.
On the other hand, since the tightening force of the first nut 22 is within the weak setting range, the bolt 21 in the elongated bolt insertion hole 5Ba is allowed to be displaced in the in-plane direction. As a result, as shown in FIG. 1B, even when the exterior panel W is displaced between layers due to thermal expansion and contraction, an earthquake, etc., the bolt 21 for attaching the exterior panel W is placed in the elongated bolt insertion hole 5Ba. Can be displaced relatively freely in the in-plane direction. Therefore, it is possible to prevent an unreasonable stress from being applied from the bolt 21 to the exterior panel W in the in-plane direction, and to prevent damage to the exterior panel W due to the stress.

The anti-loosening effect was verified by an axial right-angled vibration impact test (NAS type) for the fastening methods in each of the embodiments of Example 1, Comparative Example 1, and Comparative Example 2 of the present invention as shown below.
The conditions for the axial right-angled vibration impact test are as follows.
Vibration frequency: 1780 rpm
Vibration table vibration acceleration: 19.5G
Vibration table stroke: 11 mm
Impact stroke: 19.0 mm

Regarding the bolts and nuts used in Example 1, Comparative Example 1, and Comparative Example 2, the nominal diameter x pitch is M16 x 2.0, the material is SUS304, and the shape type is 3 types (chamfering on both sides). Something).
The preveling torque type detent nut used in Example 1 and Comparative Example 1 was U-NUT (FUN coat) manufactured by Fuji Precision Co., Ltd.

(Example 1)
In the form of a double nut in which the first nut and the second nut are screwed into the bolt in order, the first nut is a general nut and the second nut is a preveling torque type detent nut. A test (NAS formula) was carried out.
In the first embodiment, the first nut is screwed to the intermediate position of the bolt by hand tightening, and the second nut is fixed to a predetermined torque (38N) with the first nut fixed by a spanner.・ Tightened with m) to complete the fastening with nuts.

(Comparative Example 1)
A shaft orthogonal vibration impact test (NAS type) was carried out in the form of a single nut in which one nut was screwed into a bolt, and the nut was used as a preveling torque type detent nut. In Comparative Example 1, the preveling torque type detent nut was screwed into the intermediate position of the bolt to complete the fastening with the nut. Moreover, in this test, one kind of preveling torque type detent nut was used.

(Comparative Example 2)
In addition to the form of a double nut in which the first nut and the second nut are screwed into the bolt in order, a shaft right angle vibration impact test (NAS type) was conducted with the first nut and the second nut as general nuts, respectively. ..
In Comparative Example 2, the first nut is screwed to the intermediate position of the bolt by hand tightening, and the second nut is fixed to a predetermined torque (10N) with the first nut fixed by a spanner. -Tightened with m), then with the second nut fixed with a spanner, the first nut was rotated in the reverse direction with the specified torque (5 Nm) to complete the fastening with the nut.

(Test results)
The results of the axial right-angled vibration impact test (NAS type) in the above Examples, Comparative Example 1, and Comparative Example 2 will be described below.
In the double nut fastening method using the preveling torque type detent nut of Example 1 as the second nut, no looseness of the nut could be confirmed even when the vibration cycle was set to 30,000 cycles.
In the fastening method using a single nut using the preveling torque type detent nut of Comparative Example 1, when the vibration cycle was set to 30,000 cycles, the nut was loosened (shifted) by 30 °.
In the double nut fastening method using only the general nut of Comparative Example 2, the nut loosened and fell off when the vibration cycle was 5000 cycles.
Based on the above test results, the fastening method using a double nut using the preveling torque type detent nut as the second nut as in Example 1 is a single method using the preveling torque type detent nut as in Comparative Example 1. It was confirmed that a sufficient anti-loosening effect can be exhibited even under harsh conditions as compared with the fastening method using only nuts and double nuts such as Comparative Example 2.

[Another Embodiment]
Other embodiments of the present invention will be described. It should be noted that the configurations of the respective embodiments described below are not limited to being applied independently, but can also be applied in combination with the configurations of other embodiments.

(1) In the above embodiment, the preveling torque type detent nut, which is the second nut 23, is configured to have the friction ring 24 made of metal, but the second nut 23 is screwed or screwed into the bolt 21. Other forms may be used as long as the preveling torque required for returning is generated for a long period of time.

(2) In the above embodiment, the first nut 22 is manually tightened to the bolt 21, but of course, the first nut 22 may be tightened with a tool such as a wrench or a spanner.

(3) In the above embodiment, after the tightening of the second nut 23 with respect to the bolt 21 is completed, the fastening with the double nut is completed without rotating the first nut 22 in the reverse direction, but the first nut 22 is slightly rotated in the reverse direction. This may be configured to increase the frictional force between the first nut 22 and the second nut 23.

(4) In the above embodiment, the exterior panel W has been described as an example of an exterior member attached to the side surface of the building S, but in the present invention, the exterior member other than the exterior panel may be attached to the side surface of the building as the exterior member. Applicable. Further, although the bolt insertion hole 5Ba of the bracket 5 through which the bolt 21 for attaching the exterior panel W to the building S is inserted is formed in a long hole shape, it may be formed in a round hole shape.

2Ca bolt insertion hole 5 bracket (attached part)
5Ba Bolt insertion hole 20 Bolt fastening 21 Bolt 22 1st nut 23 2nd nut 24a Friction piece S Building Sa Mounting surface W Exterior panel (exterior member)

Claims (2)

A nut is screwed into an exterior member to be attached to a mounted portion on the side of a building and a bolt extending from one side of the mounted portion and inserted into a bolt insertion hole on the other side, and the exterior member is attached to the mounting portion. It is a method of attaching an exterior member to be attached to the attachment part.
The nut is a double nut composed of a first nut screwed into the bolt and a second nut screwed into the bolt following the first nut.
The second nut is a preveling torque type detent nut having a friction piece for generating preveling torque on the follow-up side opposite to the advancing direction side at the time of screwing .
By manually tightening the first nut screwed into the bolt, the tightening force of the first nut is in-plane while preventing the bolt from being displaced in the bolt insertion hole in the axial direction. Displacement is within the allowable setting range
While preventing rotation of said first nut screwed to the bolt, and tightening the second nut screwed on the bolt, the exterior member mounting method for completing the fastening by the double nut. The exterior member is an exterior panel.
The method for attaching an exterior member according to claim 1 , wherein the bolt insertion hole is formed of an elongated hole.

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