JP7240255B2 - Floor panel fastening structure and floor panel bolt fastening method - Google Patents

Description

The present invention relates to a floor panel fastening structure and a floor panel bolt fastening method.

Conventionally, a floor panel is known in which both ends in the longitudinal direction are fixed to floor beams using bolts (see, for example, Patent Document 1). In this prior art, a stud bolt fixed to the floor beam is inserted into a through hole of the floor panel, and a nut is fastened to the stud bolt to fix the floor panel to the floor beam.
Moreover, when fixing the floor panel to the floor joist, bolts instead of stud bolts are passed through the floor panel from above and fastened to the floor girders.

JP 2009-102832 A

However, when stud bolts are used as in Patent Document 1, the floor panel is transported so that the stud bolts provided in the floor beams in an upright state are passed through the bolt through-holes formed through the floor panel. is difficult and time-consuming. That is, when a floor panel is transported over the floor beams of a building, it is common practice to tie the floor panel with a wire or the like, lift it up with a lifting device, and transport it. In this case, a gap is required to remove the string hung on the floor panel. It is to be manually moved to the installation position of . Therefore, the work is time-consuming, resulting in an increase in construction period and cost.

On the other hand, when bolts are passed through the floor panel and fastened to the floor beam after the floor panel is transported to the proper installation position, the following problems arise.
That is, as shown in FIG. 7, when the worker 01 rotates the head of the bolt 03 on the upper side of the floor panel 02 to fasten it to the frame such as the floor beam 04, it is necessary to prevent the nut from rotating along with the bolt. There is In this case, when the worker 01 performs the fastening work by himself, he/she puts his/her hand under the floor panel 02 as shown in the figure to stop the nut from rotating along with the bolt.
Therefore, when the bolt 03 is provided in the center of the width direction of the floor panel 02, the installation position of the bolt 03 is limited to a position where the operator 01 can turn his hand as described above, and the width of the floor panel 02 is limited. The dimensions are limited to reach the center. Moreover, during this fastening work, the worker 01 leans over the floor panel 02 as shown in the figure. We need a way to ensure that.

In order to solve the above problem, the workers 01, 01 are placed on both the upper and lower sides of the floor panel 02, and the two work together. However, in this case, the number of manpower required increases, and in addition, the work must be done while coordinating the start and end of the fastening operation on the upper floor and the lower floor, which requires time and effort, and the construction period and time are shortened. lead to increased costs.

The present disclosure has been made by focusing on the above-mentioned conventional problems, and by enabling the fastening of bolts by working from one side of the floor panel, it is possible to improve the degree of freedom in terms of the dimensions of the floor panel. It is an object of the present invention to provide a floor panel fastening structure and a floor panel bolt fastening method capable of enhancing work safety and suppressing construction period and cost.

In order to achieve the above object, the floor panel fastening structure of the present disclosure includes:
A floor panel fastening structure in which the floor panel is fastened to the frame of the building by using a bolt passing through the floor panel with its head upward and a nut engaged with the threaded portion of the bolt projecting downward from the floor panel. and
A bolt through hole formed vertically through the floor panel for the threaded portion to pass through; ,
A rotation restricting structure is provided between the counterbore and the head to restrict rotation of the head ,
The rotation restricting structure includes a washer eccentrically provided on the head of the bolt and fixed to the bolt, and the counterbore provided eccentrically in the bolt through hole,
The counterbore has a diameter larger than that of the washer, and can accommodate the head and the washer so as to be rotatable with the screw portion penetrating the bolt through hole,
In addition, both the eccentricity amounts are determined by the portion where the outer circumference of the washer does not interfere with the inner circumference of the counterbore and the bolt is rotated at a large interval, and the outer circumference of the washer interferes with the inner circumference of the counterbore. It is set so as to be able to form a narrow space for restricting the rotation of the bolt .

Also, the floor panel bolt fastening method of the present disclosure performs the following steps.
The head and the washer are arranged in the counterbore, the screw portion of the bolt is passed through the bolt through hole of the floor panel, and the fixing plate is attached to the screw portion projecting downward from the floor panel. after mounting, mounting a nut on the threaded portion from the underside of the fixing plate, and placing the fixing plate in the disengaged position.
arranging the floor panel at a predetermined installation position on the frame;
The fixing plate is rotated from the bottom side of the floor panel to the engagement position with respect to the threaded portion, and the nut is rotated in the tightening direction so that the outer circumference of the washer and the inner circumference of the counterbore are rotated. a step of fastening the floor panel to the frame by interfering with and restricting the rotation of the head.

In the floor panel fastening structure and floor panel bolt fastening method disclosed in the present disclosure, it is possible to fasten the bolts from one of the upper and lower sides of the floor panel, thereby improving the degree of freedom in terms of dimensions of the floor panel and improving the safety of the work. can be improved, and the construction period and cost can be suppressed.

Fig. 3 is a perspective view showing a state in which the floor panel 20 of Embodiment 1 is laid over the floor beams 12, 12; FIG. 4 is a cross-sectional view showing a main part of the floor panel 20 used in the floor panel fastening structure of Embodiment 1; FIG. 4 is an explanatory diagram of an eccentricity of a washer 32 in a bolt 30 used in the floor panel fastening structure of Embodiment 1; 4 is an explanatory diagram showing the relationship between a washer 32 and a counterbore 22 in the floor panel fastening structure of Embodiment 1. FIG. 4 is an explanatory diagram showing the relationship between a washer 32 and a counterbore 22 in the floor panel fastening structure of Embodiment 1. FIG. 4 is a perspective view showing the floor panel 20 in the floor panel fastening structure of Embodiment 1 during transportation. FIG. FIG. 4 is an explanatory diagram of a state in which the floor panel 20 to which the floor panel fastening structure of Embodiment 1 is applied is transported to a predetermined installation position of the floor beam 12; FIG. 4 is an explanatory diagram of a state in which the suspension metal fitting 50 is removed from the floor panel 20 to which the floor panel fastening structure of Embodiment 1 is applied, and the head 31 and the washer 32 of the bolt 30 enter the counterbore 22; FIG. 4 is an explanatory diagram of a state in which the floor panel 20 is fixed to the floor beam 12 by fastening bolts 30 with the floor panel fastening structure of Embodiment 1; FIG. 4 is an explanatory diagram of a problem to be solved by the floor panel fastening structure of Embodiment 1;

Hereinafter, an embodiment for realizing a floor panel fastening structure and a floor panel bolt fastening method according to the present disclosure will be described based on the drawings.
The floor panel fastening structure and the floor panel bolt fastening method of Embodiment 1 are used for fixing the floor panel 20 forming the floor FL of the building 1 shown in FIG.

The floor panel 20 is installed while being bridged over the floor beams 12 , 12 of the building 1 . Channel steel or the like can be used as the floor beam 12, and in the first embodiment, H-shaped steel having an upper flange 12a and a lower flange 12b is used.

(Description of floor panel fixing structure)
Next, a structure for fixing the floor panel 20 to the floor beam 12 will be described.
As shown in FIG. 1, the floor panel 20 is formed in a rectangular plate shape having a length that can be bridged over the floor beams 12, 12. A plurality of floor panels 20 are arranged in parallel in a direction along the floor beams 12 to form the floor FL. It is formed. In the floor panel 20, bolt through-holes 21 for vertically penetrating the screw portions 33 of the bolts 30 shown in FIG. The material of the floor panel 20 is not particularly limited, and known materials such as precast concrete panels and wooden panels can be used. In Embodiment 1, a lightweight cellular concrete panel (ALC panel) is used as the floor panel 20 .

The bolt through-holes 21 are arranged in the longitudinal direction of the floor panel 20 so as to be located inside the upper flanges 12a of the floor beams 12 when spanning the floor beams 12 , 12 . In addition, it is arranged in the center of the floor panel 20 in the width direction perpendicular to the longitudinal direction of the floor panel 20 (see FIG. 1). Further, at the upper end of the bolt through-hole 21, a recessed counterbore 22 capable of accommodating a head 31 of a bolt 30 and a washer 32, which will be described later, is formed.

As shown in FIGS. 4A and 4B, the counterbore 22 and the bolt through hole 21 are formed in a circular shape when viewed from above. Further, as shown in FIG. With respect to the central axis c21 of the through hole 21, the position is shifted in the direction orthogonal to the axis, that is, formed eccentrically. Specifically, the counterbore 22 has a diameter of about 60 mm and a depth of about 10 mm, and the bolt through hole 21 has a diameter of about 15 mm and a central axis thereof extending from the central axis of the counterbore 22 by about 7 mm. They are staggered. Also, the counterbore 22 is formed to have a depth larger than the vertical dimension of the sum of the head 31 of the bolt 30 and the washer 32, which will be described later.

The floor panel 20 is fixed to the floor joist 12 by means of a bolt 30 inserted through the bolt through-hole 21 and a fixing plate 40 and nut 34 supported by the lower end of the bolt 30. The details will be explained.
As shown in FIG. 3, the bolt 30 is provided with a doughnut disk-shaped washer 32 having a hole 32a formed therein under a hexagonal head 31. As shown in FIG. The washer 32 is fixed to one or both of the head portion 31 and the screw portion 33 by welding. The head portion 31 and the threaded portion 33 are formed coaxially with the central axis c30 of the bolt 30, while the central axis c32 of the washer 32 is perpendicular to the central axis c30 of the bolt 30. are staggered. Specifically, the screw portion 33 has a diameter of about 10 mm, the washer 32 has an outer diameter of about 50 mm, and the inner hole 32a has an inner diameter of about 15 mm. The inner peripheral surface of the hole 32a of the washer 32 is fixed to the bolt 30 in contact with the outer periphery of the base end portion of the screw portion 33, and the central axis c32 of the washer 32 is 2.5 mm from the central axis c30 of the bolt 30. Somewhat eccentric.

The outer diameter dimension of the washer 32 and the eccentricity of the washer 32 in the bolt 30 and the inner diameter dimension and eccentricity of the counterbore 22 are set so as to have the following relationship. That is, when the head 31 and the washer 32 can be accommodated in the countersunk hole 22 with the threaded portion 33 inserted into the bolt through-hole 21, when the bolt 30 is rotated, the outer circumference of the washer 32 and the washer 32 may be separated from each other during rotation. It is set so as to interfere with the inner periphery of the trench 22 to restrict the rotation of the bolt 30. - 特許庁Therefore, as shown in FIG. 4A, compared with the dimension ma32 from the central axis c30 of the threaded portion 33 to the farthest outer peripheral position of the washer 32, The dimension ma22 to the inner peripheral position is larger, and the dimension mi22 to the inner peripheral position closest to the central axis c21 is smaller.

In order to fix the floor panel 20, as shown in FIG. 6A, a fixing plate 40 is attached to the threaded portion 33 of the bolt 30 projecting downward from the floor panel 20, and then a nut 34 is engaged.
The fixing plate 40 is formed of a metal plate material, and is formed in a two-stepped shape by a base portion 41 and an engaging piece portion 42 positioned below the base portion 41 . A bolt insertion hole 41 a through which the threaded portion 33 of the bolt 30 is inserted is formed in the base portion 41 . Therefore, the fixing plate 40 moves along the screw portion 33 integrally with the nut 34 when the nut 34 is tightened.

The base portion 41 is rotatably attached to the threaded portion 33 of the bolt 30 . Further, the base portion 41 is formed in a size that does not interfere with the upper flange 12a of the floor beam 12 in the vertical direction when it is attached to the screw portion 33 .

The engagement piece portion 42 extends radially from the base portion 41, and in a state in which the base portion 41 is in contact with the back surface of the floor panel 20, the step (base portion 41) and radial length are set. That is, by rotating the base portion 41 with respect to the screw portion 33, the fixing plate 40 can be vertically aligned with the floor beam 12 when the floor panel 20 is bridged over the floor beam 12 as shown in FIGS. 6A and 6B. It is mounted movably between a non-engaging position where it does not engage and an engaging position where it engages in the vertical direction as shown in FIG. 6C.

Therefore, when fixing the floor panel 20 to the floor beam 12, the head 31 and the washer 32 of the bolt 30 are housed in the counterbore 22 as shown in FIG. 6B. Then, as shown in FIG. 6C, the fixing plate 40 is engaged with the floor panel 20 by fastening the nut 34 with the engagement piece 42 positioned below the upper flange 12a of the floor beam 12. The upper flange 12a is sandwiched between the joint piece 42 and the base 41 of the fixing plate 40 is arranged close to the upper flange 12a at the same time. As a result, the floor panel 20 can be fixed to the floor beam 12 while being restricted from moving in the vertical direction and the longitudinal direction of the floor panel 20 with respect to the floor beam 12 .

The bolts 30 are also used for carrying the floor panel 20 in the first embodiment.
That is, when the floor panel 20 is transported, as shown in FIG. 6A, the suspension fitting 50 is inserted between the lower surface of the washer 32 of the bolt 30 and the surface 20a of the floor panel 20 and engaged. Then, the hanging fitting 50 is hooked to a lifting device 100 of a lifting device such as a crane, and the floor panel 20 is transported to a predetermined installation position over the floor beams 12, 12 of the building 1. - 特許庁

Here, the suspending metal fitting 50 will be briefly described.
The suspension metal fitting 50 is formed of a metal plate material, and as shown in FIG. That is, when the bolt engaging piece 51 is positioned horizontally, the hanging piece 52 is formed in a shape that rises obliquely.

The bolt engaging piece 51 is formed with a threaded portion insertion hole 51a. The threaded portion insertion hole 51a is formed from the open end of the edge on the hanging piece 52 side to the central position of the bolt engaging piece 51, and has a width that allows the threaded portion 33 of the bolt 30 to be inserted. The width is smaller than the diameter of the head 31 and the washer 32 .

The hanging piece 52 is formed with a head insertion hole 52a and a locking hole 52b. The head insertion hole 52a is formed continuously with the threaded portion insertion hole 51a at the edge portion that is continuous with the bolt engaging piece 51, and has a rectangular shape that allows the head 31 of the bolt 30 and the washer 32 to be inserted therethrough. Opened in shape. The locking hole 52b is circularly opened at a position slightly away from the bolt engaging piece 51 from the center of the hanging piece 52. As shown in FIG.

Next, the procedure of fixing the floor panel 20 to the floor beams 12, 12 after the floor panel 20 is laid over the floor beams 12, 12 as shown in FIG.

First, the bolt 30 and the fixing plate 40 are attached to the floor panel 20 . In this case, with the head 31 and washer 32 of the bolt 30 facing up, the threaded portion 33 is passed through the bolt through-hole 21 of the floor panel 20 from above, as shown in FIG. 6A.

Next, the fixing plate 40 is attached to the screw portion 33 . That is, the screw portion 33 projecting from the lower end of the bolt through hole 21 is inserted into the bolt through hole 41 a of the base portion 41 . Further, a nut 34 is fitted under the fixing plate 40 from the distal end side of the threaded portion 33 so as to be engaged therewith.
The mounting position of this nut 34 is such that when the bolt 30 is pulled up from the floor panel 20 and the fixing plate 40 is brought into contact with the rear surface of the floor panel 20, the hanging metal fitting 50 is positioned between the washer 32 and the surface 20a of the floor panel 20. The bolt engagement piece 51 of is positioned to form a gap into which it can be inserted. Also, the fixing plate 40 is placed in the non-engaging position.

Next, the suspension fitting 50 is engaged with the insert bolt 30 between the washer 32 and the surface 20 a of the floor panel 20 . Then, a hanging tool 100 of a lifting device such as a crane (not shown) is hooked to the locking hole 52b of the hanging piece 52 of the hanging metal fitting 50, and the floor beams 12, 12 of the building 1 are bridged at a predetermined installation position. transport to That is, since the floor panel 20 is not tied with strings, the floor panel 20 can be directly arranged at a predetermined installation position of the floor beam 12 . At this time, since the fixing plate 40 is arranged at the non-engaging position, the floor panel 20 can be bridged over the floor beams 12 without interfering with the upper flanges 12a of the floor beams 12 .

Next, the suspending metal fitting 50 is removed from the bolt 30 . Here, when the hanging metal fitting 50 is removed, the bolt 30 moves downward due to its own weight, and as shown in FIG. The fixed plate 40 is lowered to a position lower than the upper flange 12a of the floor beam 12. - 特許庁

Next, fastening work is performed using the fixing plate 40 and the nut 34 . This fastening work is performed from below the floor panel 20 . For example, when installing the floor panel 20 as the floor FL of the second floor, the work starts from the first floor.

In this fastening work, first, the fixing plate 40 is rotated around the bolt 30 from the non-engagement position shown in FIG. 6A to the engagement position shown in FIG. It is arranged below the flange 12a. At this point, the engaging piece 42 is separated below the upper flange 12a.

Next, the nut 34 is rotated in the tightening direction to narrow the distance between the head 31 and the nut 34 and fixing plate 40, and as shown in FIG. and the engaging piece 42 to fix the floor panel 20.例文帳に追加

When the nut 34 is rotated in the tightening direction from below in this manner, the bolt 30 also rotates together with the screw portion 33 due to frictional resistance at first. Therefore, as shown in FIG. 4A, the portion of the dimension ma32 where the distance between the central axis c30 of the bolt 30 and the outer periphery of the washer 32 is large corresponds to the dimension between the central axis c21 of the bolt through-hole 21 and the inner periphery of the counterbore 22. When the ma 22 is positioned at a large position, the washer 32 rotates with respect to the counterbore 22 .

However, after that, as shown in FIG. 4B, the distance between the central axis c30 of the bolt 30 and the outer periphery of the washer 32, which has a large dimension ma32, narrows the distance between the central axis c21 of the bolt through-hole 21 and the inner periphery. When approaching the location (location of dimension mi22), the outer periphery of the washer 32 interferes with the inner periphery of the counterbore 22, and from this point on, the rotation of the bolt 30 is restricted, and the nut 34 is pulled against the threaded portion 33. It can be rotated and fastened. Thereby, the floor panel 20 can be fixed to the floor beam 12 .

In this way, the floor panel 20 can be fixed to the floor beam 12 by one worker by tightening the nuts 34 from below the floor panel 20 . Therefore, as shown in FIG. 7, the worker 01 does not need to reach for the bolts 30 and nuts 34 above and below the floor panel 20 with both hands, and the floor panel 20 is not restricted in terms of its dimensions. There is no need to guarantee safety against the fall of a person. Further, even if the size of the floor panel 20 is increased, workers are not required for the upper and lower sides of the floor panel 20, and workability is excellent, and construction period and cost can be reduced.

(Effect of Embodiment)
The effects of the floor panel fastening structure of the first embodiment are enumerated below.
(1) The floor panel fastening structure of Embodiment 1 consists of a bolt 30 that penetrates the floor panel 20 with its head 31 upward, and a nut 34 that is engaged with a threaded portion 33 of the bolt 30 projecting downward from the floor panel 20. is used to fasten the floor panel 20 to the floor beam 12 as the frame of the building. A bolt through hole 21 is formed vertically through the floor panel 20 and allows the screw portion 33 of the bolt 30 to pass therethrough, and a head portion 31 of the bolt 30 is formed at the upper end of the bolt through hole 21. A counterbore 22 is provided, and a rotation restricting structure for restricting rotation of the head 31 is provided between the counterbore 22 and the head 31 of the bolt 30. - 特許庁
Therefore, when the nut 34 is tightened, the bolt 30 is restricted from rotating together by the rotation restricting structure, and the fastening can be performed only from the side of the floor panel 20 where the nut 34 is provided. Therefore, it is possible to tighten the bolts 30 from one of the upper and lower sides of the floor panel 20, thereby improving the dimensional freedom of the floor panel 20 and enhancing the safety of the work. Moreover, compared to the case where workers are arranged above and below the floor panel 20 and work in cooperation with each other, the construction period and cost can be suppressed.

(2) The rotation restricting structure of the floor panel fastening structure of Embodiment 1 includes a washer 32 provided eccentrically on the head 31 of the bolt 30, a counterbore 22 provided eccentrically on the bolt through-hole 21, and the counterbore 22 can accommodate the head 31 and the washer 32 with the threaded portion 33 passing through the bolt through-hole 21, and the eccentricity of the bolt 30 is The outer periphery of the washer 32 is set so as to interfere with the inner periphery of the counterbore 22 to restrict rotation.
Therefore, the rotation of the bolt 30 can be restricted by a simple configuration in which the washer 32 is eccentric to the bolt 30 and the counterbore 22 is eccentric to the bolt through hole 21 . Therefore, compared with the case where the counterbore 22 is provided with a separate member such as a stopper that engages with the head portion 31, the above effect (1) can be obtained at a low cost.

(3) In the floor panel fastening structure of Embodiment 1, the bolt through-holes 21 and the bolts 30 are provided at positions that do not overlap with the floor beams 12 as the building frame in the horizontal direction, and the screws 33 are provided with nuts 34. A fixing plate 40 is mounted adjacent to the fastening direction. The fixing plate 40 is formed movably along the threaded portion 33 and includes an engaging piece portion 42 as an engaging portion capable of engaging with the floor beam 12. It is provided rotatably around a threaded portion 33 at an engagement position where it engages with the beam 12 and a non-engagement position where it does not engage with the floor beam 12 .
Therefore, compared to the method in which the bolts 30 are inserted into the holes formed through the floor beams 12 and then the nuts 34 are tightened, the work of inserting the bolts 30 through the holes is required when installing the floor panel 20. It is unnecessary and has excellent workability.

(4) In the floor panel fastening structure of Embodiment 1, the washer 32 has a hole 32a having a larger diameter than the threaded portion 33 at the axial center thereof, and the inner circumference of the hole 32a is the base of the threaded portion 33. It is welded to the bolt 30 while being in contact with the outer circumference of the end.
Therefore, it is easy to set the eccentricity of the washer 32, and the manufacturability is excellent.

(5) In the floor panel fastening structure of Embodiment 1, the bolts 30 are used for transporting the floor panel 20 so that the slinging work of the floor panel 20 can be omitted. Also by this, the construction period and cost can be reduced.

(6) The floor panel bolt fastening method of Embodiment 1 executes the following steps.
The head 31 and the washer 32 are arranged in the countersunk hole 22 , the screw portion 33 of the bolt 30 is passed through the bolt through hole 21 of the floor panel 20 , and the fixing plate 40 is attached to the screw portion 33 projecting downward from the floor panel 20 . , mounting the nut 34 on the threaded portion 33 from below the fixing plate 40, and placing the fixing plate 40 in the non-engaging position.
A step of arranging the floor panel 20 at a predetermined installation position of the floor beam 12 of the building 1 .
The fixing plate 40 is rotated from the lower side of the floor panel 20 to the engagement position with respect to the screw portion 33, and the nut 34 is rotated in the tightening direction so that the outer circumference of the washer 32 and the inner circumference of the counterbore 22 are connected. a step of fixing the floor panel 20 to the floor beam 12 by interfering with each other to restrict the rotation of the head 31 .
Therefore, when the nut 34 is rotated, the head 31 of the bolt 30 and the washer 32 can be prevented from rotating together without being restrained from above. can be done with Therefore, as explained with reference to FIG. 7, one worker 01 stretches his hand above and below the floor panel 02 to stop the nut from rotating along with the bolt, and two workers 01 and 01 stretch the floor panel 02 to prevent the nut from rotating. There is no need to work in cooperation with the upper and lower parts of 02. Therefore, the labor and time required for the work can be shortened, the construction period and cost can be reduced, and the safety of the worker 01 can be easily ensured.

The floor panel fastening structure and the floor panel bolt fastening method of the present disclosure have been described above based on the embodiments. However, the specific configuration of the floor panel fastening structure of the present disclosure is not limited to these embodiments, and any combination of the embodiments without departing from the gist of each claim. , design changes and additions are permitted.

For example, in the embodiment, an example in which the floor panel fastening structure and the floor panel bolt fastening method are applied to the steel frame building 1 is shown. However, this method of transporting floor panels is applicable to conventionally constructed buildings and unit buildings as long as the floor panels are laid over the floor beams.

Further, in the embodiment, as a rotation restricting structure for restricting the rotation of the bolt 30 when the nut 34 is tightened, the washer 32 eccentrically attached to the bolt 30 and the counterbore 22 eccentrically attached to the bolt through hole 21 are arranged in opposite directions. Although the outer circumference of the washer 32 and the inner circumference of the counterbore 22 abut against each other to restrict the rotation when the washer 32 rotates, the present invention is not limited to this. For example, when the head 31 rotates, both the engaging piece protruding from the head 31 of the bolt 30 or the washer 32 in the outer peripheral direction and the stopper provided in the counterbore 22 may be attached at a certain position. It is also possible to use a structure in which the is engaged to restrict the rotation.

Further, in the embodiment, an example in which the suspension metal fitting 50 is engaged with the bolt 30 and transported is shown, but the present invention is not limited to this, and the transport may be carried out by so-called slinging. In that case, the bolts 30 may be passed through the floor panel 20 after the floor panel 20 is transported.

Also, in the embodiment, an example in which the floor panel 20 is fixed using the fixing plate 40 is shown, but the structure for fixing the floor panel 20 is not limited to this. For example, the floor panel 20 may be fixed by passing the bolt 30 through a hole formed in the building frame such as the floor beam 12 and fastening the nut 34 to the threaded portion 33 of the bolt 30 . In this case as well, when fastening the nut 34 from below the floor panel 20, it is possible to restrict the rotation of the head 31 and the washer 32 for fastening. Alternatively, a plate having a shape different from that of the fixing plate 40 shown in the embodiment may be used.

12 Floor beams (framework)
12a Upper flange 20 Floor panel 21 Bolt through hole 22 Counterbore 30 Bolt 31 Head 32 Washer 33 Threaded portion 34 Nut 40 Fixing plate 42 Engaging piece (engaging portion)
c21 (of bolt through-hole 21) central axis c22 (of counterbore 22) central axis c30 (of bolt 30 (head 31 and screw portion 33)) central axis c32 (of washer 32) central axis c33 central axis FL floor

Claims (3)

A floor panel fastening structure in which the floor panel is fastened to the frame of the building by using a bolt passing through the floor panel with its head upward and a nut engaged with the threaded portion of the bolt projecting downward from the floor panel. and
A bolt through hole formed vertically through the floor panel for the threaded portion to pass through; ,
A rotation restricting structure is provided between the counterbore and the head to restrict rotation of the head ,
The rotation restricting structure includes a washer eccentrically provided on the head of the bolt and fixed to the bolt, and the counterbore provided eccentrically in the bolt through hole,
The counterbore has a diameter larger than that of the washer, and can accommodate the head and the washer so as to be rotatable with the thread portion passing through the bolt through hole,
In addition, both eccentricity amounts are determined by a portion where the outer circumference of the washer does not interfere with the inner circumference of the counterbore and the bolt is rotated at a large interval, and the outer circumference of the washer interferes with the inner circumference of the counterbore. The floor panel fastening structure is set so as to be able to form a narrow space for restricting the rotation of the bolt . In the floor panel fastening structure according to claim 1 ,
The bolt through hole and the bolt are provided at a position that does not overlap the skeleton in the horizontal direction,
A fixing plate is attached to the screw portion adjacent to the fastening direction of the nut,
The fixing plate includes an engaging portion that is movably formed along the threaded portion and engageable with the skeleton, an engaging position where the engaging portion engages with the skeleton; A floor panel fastening structure provided so as to be rotatable about the threaded portion at a non-engaging position where the frame is not engaged. A floor panel bolt fastening method using the floor panel fastening structure according to claim 2 ,
The head and the washer are arranged in the counterbore, the screw portion of the bolt is passed through the bolt through hole of the floor panel, and the fixing plate is attached to the screw portion projecting downward from the floor panel. after mounting, mounting a nut on the threaded portion from below the fixing plate, and placing the fixing plate in the disengaged position;
arranging the floor panel at a predetermined installation position of the skeleton;
The fixing plate is rotated from the bottom side of the floor panel to the engagement position with respect to the threaded portion, and the nut is rotated in the tightening direction so that the outer circumference of the washer and the inner circumference of the counterbore are rotated. a step of fastening while restricting the rotation of the head by interfering with and fixing the floor panel to the skeleton;
A floor panel bolt fastening method comprising :

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