JP4397474B2 - Building unit fastening tool, building unit and fastening method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a building unit fastening tool such as a balcony unit and a living room unit, a building unit, and a fastening method thereof.
[0002]
[Prior art]
Conventionally, when installing a building unit on a foundation or a lower floor building unit (lower structure), the hollow columns of the building unit are fastened to the lower structure with bolts. As described in Japanese Patent Application No. 7-22634), the end of the fastening tool is provided with a bolt holding part that holds the bolt with a strong magnetic force, and the bolt held by this bolt holding part is opened from the opening of the hollow column. There is one that is inserted into the hollow column and screwed into the connecting portion on the lower structure side.
[0003]
Further, in this prior art, in order to confirm the completion of the fastening by the fastening tool, a torque wrench is engaged with the tool engaging portion provided in the operation portion of the fastening tool, thereby giving a necessary fastening torque to the bolt, The fastening completion of bolts is managed by providing a fastening torque confirmation device that ejects ink with a fastening torque confirmation mark on the upper surface of the column by this torque.
[0004]
[Problems to be solved by the invention]
However, the prior art has the following problems.
(1) In order to manage the completion of bolt fastening, it is essential to use a torque wrench and to additionally provide a fastening torque confirmation device, which requires complicated construction management.
[0005]
(2) In order to hold the bolt on the fastening tool, it is essential to provide a complicated bolt holding portion capable of turning on / off a strong magnetic force, and the holding of the bolt is complicated.
[0006]
The subject of this invention is managing the fastening torque of a volt | bolt simply and reliably.
[0007]
Another object of the present invention is to simply and reliably hold the bolt at the tip of the fastening tool.
[0008]
[Means for Solving the Problems]
The present invention described in claim 1 is a building unit fastening tool used when a building unit is mounted on a lower structure and the bottom of the hollow structure of the building unit is fastened to the lower structure with a bolt. As an applied bolt, the head is divided into upper and lower parts, and has a narrow constricted part between the upper and lower heads, a bolt holding part, and an operation part for rotating the bolt holding part , , and a shaft portion extending between the operation unit bolt holding portion, the bolt holding portion, the head portion and the receiving on the bolt, engages the upper head and the rotational operation direction angle a hole-shaped engagement hole, to receive the lower head of the bolt, and Maruanajo Hikakarigoana portion does not engage with the lower head and the rotational operation direction, engaging holes and Hikakarigoana Is provided between the two portions, and is engaged with the constricted portion of the bolt to hold the upper head of the bolt in the engagement hole portion in the axial direction. It is obtained by the so and a stop portion.
[0010]
The present invention according to claim 2 is a method for fastening the building unit to the lower structure using the fastening tool according to claim 1, and is not engaged with the engagement hole portion of the bolt holding portion of the fastening tool. Insert each of the upper and lower heads of the bolt into each of the holes, and lock the bolt holding portion to the constricted portion of the bolt to hold the bolt. Inserted into the hollow structure through the upper opening of the hollow structure, the bolt held in the bolt holding part is initially set in the connection part on the lower structure side, and is further screwed with a predetermined tightening amount. After tightening, the bolt holding part is rotated so as to give a fastening torque to the bolt until the constricted part of the bolt is cut, and the bolt holding part of the fastening tool is extracted from the upper opening of the hollow structure, and the bolt holding Of the bolt remaining in the engagement hole The head in which they were taken out from the bolt holding portion.
[0015]
[Action]
(a) The bolt holding portion of the fastening tool is rotated by the operation portion in a state where the upper head portion of the bolt is received in the engagement hole portion and the lower head portion is received in the non-engagement hole portion. Therefore, the operating torque applied to the operating part is applied to the upper head of the bolt, and if this operating torque exceeds the required fastening torque, the narrow neck between the upper and lower heads of the bolt is twisted and broken. Let me. That is, the bolt is surely fastened with a fastening torque determined by the cross section of the constricted portion, and the completion of the fastening can be easily and reliably confirmed by the presence or absence of the lack of the upper head.
[0016]
In addition, the bolt holding part of the fastening tool is configured such that the non-engagement part is only held with respect to the lower head while the upper part of the bolt is held in the engagement hole part by the turning operation after the torsional fracture of the constriction part of the bolt. It will be idle.
[0017]
(b) The bolt holding portion holds the bolt easily and reliably by locking the locking portion provided between the engaging hole portion and the non-engaging hole portion to the constricted portion of the bolt.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view showing a method of fastening a balcony unit to a lower floor building unit, FIG. 2 is a front view showing a fastening tool, FIG. 3 shows a fastening bolt, and FIG. (B) is a front view, (C) is a side view, FIG. 4 shows a guide plate provided on a hollow handrail, (A) is a plan view, (B) is a sectional view, and FIG. 5 is a fastening tool. The front view which shows the bolt holding procedure of the bolt holding part of FIG. 6, FIG. 6 shows the insertion state of a fastening tool, (A) is a whole perspective view, (B) is a principal part enlarged view, FIG. (A) is a perspective view showing an initial setting state by the first mark, (B) is a perspective view showing a fastening completion state by the second mark, and FIG. 8 is a view from the bolt holding portion of the fastening tool. It is a front view which shows the upper head collection | recovery procedure.
[0022]
FIGS. 1-8 shows one Embodiment to which this invention was applied in construction of a unit building (FIG. 6), and mounts the balcony unit 2 on the lower-floor building unit 1 as a lower structure. And the bottom part of the hollow handrail 3 (hollow structure) of this balcony unit 2 is fastened to the lower-floor building unit 1 by the bolt 10 operated by the fastening tool 20.
[0023]
As shown in FIG. 3, the bolt 10 applied to the present embodiment has a head portion 11 and a screw portion 12. The head portion 11 is vertically divided into two parts, and between the upper head portion 11 </ b> A and the lower head portion 11 </ b> B. A narrow constriction portion 11C is provided, and a washer (spring washer 14, flat washer 14a) is incorporated in advance in a washer mounting portion 13 between the head portion 11 and the screw portion 12 without being dropped. Further, the bolt 10 includes a columnar guided portion 15 having an outer diameter substantially the same as that of the washers 14 and 14a between the head 11 and the washers 14 and 14a.
[0024]
However, the fastening tool 20 includes a bolt holding portion 21, a handle-like operation portion 22, and a shaft portion 23, as shown in FIG.
[0025]
As shown in FIG. 2, the bolt holding portion 21 is attached to the shaft portion 23 by a cap screw 24 so as to be replaceable, and is inserted into the handrail 3 from the upper opening 3 </ b> A (FIG. 6) of the handrail 3. As shown in FIG. 5, the bolt holding portion 21 has a box spanner shape, receives the upper head portion 11 </ b> A of the bolt 10, and engages with the upper head portion 11 </ b> A in the rotational operation direction of the fastening tool 10. 21 A of joint holes and the lower head part 11B of the volt | bolt 10 are received, and the lower head part 11B and the round hole-like non-engagement hole part 21B which does not engage in the rotation operation direction of the fastening tool 20 (it idles) are provided. is doing. Further, as shown in FIG. 5, the bolt holding portion 21 is engaged with the constricted portion 11C of the bolt 10 between the engaging hole portion 21A and the non-engaging hole portion 21B to hold the bolt 10 in the axial direction. It has a locking portion 21C. The locking portion 21 </ b> C can be configured by a machine screw 26 that is screwed with an L-shaped bar spanner 25. The locking portion 21 </ b> C can be constituted by a ball, a locking claw or the like incorporated in the inner surface of the bolt holding portion 21 in addition to the small screw 26.
[0026]
When the bolt holding unit 21 is inserted into the handrail 3, the operation unit 22 is outside the handrail 3 and enables the bolt holding unit 21 to be rotated. As shown in FIG. 2, the operation unit 22 includes a handle 28 that can be attached and detached with a cap screw 27 and can be manually operated, and a tool engagement unit 29 that can use a torque wrench or the like is coaxial with the shaft unit 23. It is possible to operate it electrically.
[0027]
The shaft portion 23 extends between the bolt holding portion 21 and the operation portion 22 and connects the bolt holding portion 21 and the operation portion 22. The shaft portion 23 includes a first mark 31 and a second mark 32 at two positions in the axial direction of the intermediate portion. The first mark 31 indicates that the bolt 10 held in the bolt holding part 21 is initially set in the connecting part 1A on the lower floor building unit 1 side, and the position with the top plate 5 as an animal on the handrail 3 side. Discrimination is possible based on the relationship (position match). The second mark 32 can determine that the bolt 10 is screwed to the connecting portion 1A of the lower-floor building unit 1 with a predetermined tightening amount based on the positional relationship (position matching) with the upper surface plate 5 described above. To do.
[0028]
At this time, as shown in FIGS. 1 and 6, the lower-floor building unit 1 has a taper shaft shape on a hollow column or beam (ceiling beam) constituting a portion (connection portion 1 </ b> A) on which the balcony unit 2 is mounted and connected. The joint pin 4 is integrated, and the top surface of the joint pin 4 is provided with a female screw 4A. On the other hand, the handrail 3 of the balcony unit 2 is provided with the above-described opening 3A in the upper plate 5 provided on the upper part of the hollow column or beam (ceiling beam and floor beam), and the fastening tool 20 can be inserted therein. The bottom plate 6 is attached to the bottom, and the bottom plate 6 can be fastened to the connecting portion 1 </ b> A of the lower floor building unit 1 with a bolt 10. The bottom plate 6 is provided with a tapered hole-like recess 6A into which the joint pin 4 is fitted, and a bolt insertion hole 6B that matches the female screw 4A of the joint pin 4 is provided on the top surface of the bottom plate 6. A bolt 10 for fastening the handrail 3 of the balcony unit 2 to the lower floor building unit 1 is inserted into the bolt insertion hole 6B.
[0029]
Furthermore, in the handrail 3 of the balcony unit 2, the guide plate 7 is provided in the intermediate part. As shown in FIG. 4, the guide plate 7 is a bolt guide taper 7A for guiding the bolt 10 held by the fastening tool 20 to the set position with the connecting portion 1A (the female thread 4A of the joint pin 4) of the lower floor building unit 1. And a bolt guide hole 7B at the center of the bolt guide taper 7A. The diameter of the bolt guide hole 7 </ b> B is set slightly larger than the outer diameter of the washer 14 and the guided portion 15 of the bolt 10 held by the fastening tool 20. The guide plate 7 may be attached to the bottom plate 6 with legs. The taper angle θ (FIG. 4B) of the bolt guide taper 7A of the guide plate 7 is approximately 45 degrees or more so that the bolt 10 is naturally slid by the weight of the fastening tool 20 and guided to the bolt guide hole 7B. Is good.
[0030]
Hereinafter, the fastening procedure using the fastening tool 20 will be described.
(1) The head 11 of the bolt 10 is held on the bolt holding portion 21 of the fastening tool 20 (FIG. 5). The upper head portion 11A of the bolt 10 is inserted into the engagement hole portion 21A of the bolt holding portion 21 and the lower head portion 11B of the bolt 10 is inserted into the non-engagement hole portion 21B of the bolt holding portion 21 and the bolt 10 is inserted into the constricted portion 11C of the bolt 10 The locking portion 21C (the small screw 26) of the holding portion 21 is locked using the spanner 25, and the bolt 10 is held at the tip of the fastening tool 20 without dropping off.
[0031]
(2) The bolt holding portion 21 of the fastening tool 20 is inserted into the handrail 3 through the opening 3A of the handrail 3 as shown in FIG. 6, and the bolt 10 held on the bolt holding portion 21 is inserted into the bottom plate 6 of the handrail 3. It passes through the bolt insertion hole 6B and is initially set in the connecting portion 1A (the female screw 4A of the joint pin 4) on the lower floor building unit 1 side. In the process of inserting the bolt holding portion 21, the bolt 10 held by the bolt holding portion 21 is guided by the bolt guide taper 7A and the bolt guide hole 7B of the guide plate 7 of the handrail 3 and guided to the connecting portion 1A. . At this time, the first mark 31 provided on the shaft portion 23 of the fastening tool 20 is identified on the upper surface plate 5 on the handrail 3 side as shown in FIG. Confirm by matching.
[0032]
(3) When it is confirmed that the bolt 10 held by the bolt holding part 21 of the fastening tool 20 is initially set to the connection part 1A (the female thread 4A of the joint pin 4) of the lower floor building unit 1, the operation part 22 Are used to rotate the bolt holding portion 21 and the bolt 10, screw the bolt 10 into the female screw 4 </ b> A of the joint pin 4, and attach the bottom plate 6 of the handrail 3 to the joint pin 4 at the connecting portion 1 </ b> A of the lower building unit 1. Conclude. At this time, when the second mark 32 provided on the shaft portion 23 of the fastening tool 20 coincides with the upper surface plate 5 on the handrail 3 side and further moves downward, the bolt 10 is connected to the female thread 4A of the joint pin 4. It is determined that the screwing is completed with a predetermined tightening amount. Thereafter, the turning operation of the fastening tool 20 is continued, and the constricted portion 11C of the bolt 10 is tightened until it is torsionally broken by applying an operation torque exceeding the necessary fastening torque.
[0033]
(4) When the constricted portion 11C of the bolt 10 is broken by the turning operation of the fastening tool 20 and the tightening operation becomes lighter, the fastening tool 20 is removed from the handrail 3 (FIG. 8). At this time, in the engagement hole portion 21A of the bolt holding portion 21 of the fastening tool 20, the cut upper head portion 11A is still held with the portion of the constricted portion 11C locked to the locking portion 21C. The small screw 26 constituting the locking portion 21C of the bolt holding portion 21 of the fastening tool 20 is removed with a spanner 25, and the upper head portion 11A is collected from the engagement hole portion 21A for confirmation of fastening completion.
[0034]
In addition, the lower head part 11B with which the bolt 10 fastened to the connection part 1A (the female screw 4A of the joint pin 4) of the lower-floor building unit 1 is the repair of the fastening failure of the bolt 10, and the balcony unit from the lower-floor building unit 1 2 is used to remove the bolt 10 from the connecting portion 1A of the lower-floor building unit 1 when separating the two.
[0035]
Therefore, according to the present embodiment, there are the following operations.
(1) The bolt holding portion 21 of the fastening tool 20 receives the upper head portion 11A of the bolt 10 in the engagement hole portion 21A and the lower head portion 11B in the non-engagement hole portion 21B. Is rotated. Accordingly, the operation torque applied to the operation unit 22 is applied to the upper head 11A of the bolt 10, and when this operation torque exceeds the required fastening torque, the fine torque between the upper head 11A and the lower head 11B of the bolt 10 is reduced. The diameter constricted portion 11C is twisted and broken. That is, the bolt 10 is surely fastened with a fastening torque determined by the cross section of the constricted portion 11C, and the completion of the fastening can be easily and reliably confirmed by the presence or absence of the upper head portion 11A.
[0036]
It should be noted that the bolt holding portion 21 of the fastening tool 20 moves the non-engaging portion down while holding only the upper head portion 11A in the engaging hole portion 21A by the turning operation after the torsional fracture of the constricted portion 11C of the bolt 10. It will be simply idle with respect to the hole.
[0037]
(2) The bolt holding portion 21 is configured to lock the bolt 10 easily and easily by locking the locking portion 21C provided between the engaging hole portion 21A and the non-engaging hole portion 21B to the constricted portion 11C of the bolt 10. Hold securely.
[0038]
(3) The fact that the bolt 10 held by the bolt holding part 21 is initially set in the connecting part 1A on the lower floor balcony unit 21 side on the shaft part 23 of the fastening tool 20 and the upper surface plate 5 on the hollow handrail 3 side, It is determined from the positional relationship between the first mark 31 that can be determined from the positional relationship between and the top plate 5 on the side of the hollow handrail 3 that the bolt 10 is screwed to the connecting portion 1A with a predetermined tightening amount. The second mark 32 is provided. Accordingly, the operator can easily and reliably manage the initial setting of the bolt 10 and the confirmation of the tightening amount by using the first mark 31 and the second mark 32.
[0039]
(4) When the bottom of the hollow structure of the balcony unit 2 is fastened to the lower floor balcony unit 2 with the bolt 10, the guide plate 7 is provided in the middle of the hollow structure so that the bolt 10 held by the fastening tool 20 is Guidance can be easily and reliably guided to the set position with the connecting portion 1A on the lower floor building unit 1 side, and operability can be improved.
[0040]
(5) Since the bolt 10 is provided with the guided part 15 having substantially the same outer diameter as the washers 14, 14a, the bolt 10 is extended over the long range from the connecting part 1A on the lower floor balcony unit 2 side to With the bolt guide hole 7B provided on the guide plate 4) and with a little play, the guide plate 7 can guide the ball without any difficulty.
[0041]
In the bolt 10, the washers 14, 14a can be received by the guided portion 15, and the head 11 (upper head 11A, lower head 11B) can be made smaller in diameter than the washers 14, 14a. The bolt holding portion 21 of the fastening tool 20 can be thinned, and the present invention can also be applied to the case where the opening 3A of the hollow structure (handrail 3) is small.
[0042]
Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration of the present invention is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. Is included in the present invention. For example, in the implementation of the present invention, the building unit is not limited to a balcony unit, but may be other units such as a living room unit and a roof unit. Further, the lower structure is not limited to the lower floor building unit but may be a foundation or the like.
[0043]
【The invention's effect】
As described above, according to the present invention, the fastening torque of the bolt can be managed easily and reliably.
[0044]
Further, according to the present invention, the bolt can be easily and reliably held at the tip of the fastening tool.
FIG. 1 is a cross-sectional view showing a method of fastening a balcony unit to a lower floor building unit of a hollow handrail.
FIG. 2 is a front view showing a fastening tool.
FIG. 3 shows a fastening bolt, (A) is a front view showing a state where a washer is mounted, (B) is a front view, and (C) is a side view.
4A and 4B show a guide plate provided on a hollow handrail, where FIG. 4A is a plan view and FIG. 4B is a cross-sectional view.
FIG. 5 is a front view showing a procedure for holding a bolt on a bolt holding portion of a fastening tool.
6A and 6B show an insertion state of a fastening tool, where FIG. 6A is an overall perspective view and FIG. 6B is an enlarged view of a main part.
7A and 7B show marks provided on the shaft portion of the fastening tool, wherein FIG. 7A is a perspective view showing an initial setting state using a first mark, and FIG. 7B is a perspective view showing a tightening completion state using a second mark. FIG.
FIG. 8 is a front view showing an upper head recovery procedure from a bolt holding portion of a fastening tool.
[Explanation of symbols]
1 Lower-floor building unit (lower structure)
1A Connection 2 Balcony unit (building unit)
3 Hollow handrail (hollow structure)
3A Opening 10 Bolt 11 Head 11A Upper head 11B Lower head 11C Constriction 12 Screw part 20 Fastening tool 21 Bolt holding part 21A Engagement hole 21B Non-engagement hole 21C Locking part 22 Operation part 23 Shaft part

Claims (2)

In the building unit fastening tool used when mounting the building unit on the lower structure and fastening the bottom of the hollow structure of the building unit to the lower structure with a bolt,
As an applicable bolt, use a head whose head is divided into upper and lower parts and a narrow neck between the upper and lower heads.
A bolt holding part, an operating part for rotating the bolt holding part, and a shaft part extending between the bolt holding part and the operating part,
A bolt holding portion receives the upper head of the bolt, receives a square hole-like engagement hole that engages the upper head in the rotational operation direction, and receives the lower head of the bolt. And a round hole-shaped non-engagement hole portion that is not engaged in the rotation operation direction, and is provided between the engagement hole portion and the non-engagement hole portion, and is locked to a constricted portion of the bolt to A building unit fastening tool comprising a locking portion that holds the portion in the engagement hole portion in the axial direction. A fastening method to a substructure of a building unit using the fastening tool according to claim 1,
The upper and lower heads of the bolt are inserted into the engaging hole and the non-engaging hole of the bolt holding part of the fastening tool, and the locking part of the bolt holding part is locked to the constricted part of the bolt. Hold the bolt,
The bolt holding portion of the fastening tool is inserted into the hollow structure from the upper opening of the hollow structure, and the bolt held by the bolt holding portion is initially set at the connection portion on the lower structure side, and further, The bolt holding portion is rotated so as to give a fastening torque to the bolt until the constricted portion of the bolt is cut.
A method for fastening a building unit, wherein a bolt holding portion of a fastening tool is extracted from an upper opening of a hollow structure, and an upper head portion of a bolt remaining in an engagement hole portion of the bolt holding portion is taken out from the bolt holding portion.

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