JP7760331B2 - Rail fixing structure - Google Patents

Description

The present invention relates to a rail fixing structure.

Fixing structures for fixing racks such as server racks to rails laid on the floor are known (see, for example, Patent Documents 1 to 5). The fixing structure disclosed in Patent Document 1 has a nut member placed inside the rail and a fixing bolt that is tightened into the nut member to fix the rack to the rail.

The nut member is rectangular and is dropped into the rail through an opening in the top surface of the rail. A fixing bolt on the rack is tightened into a threaded hole formed in the longitudinal center of the nut member through the opening in the rail. At this time, the nut member rotates together with the fixing bolt. As a result, the nut member rotates 90 degrees relative to the rail, and both longitudinal ends of the nut member come into contact with the inner wall surface of the rail. This limits the rotation of the nut member relative to the rail. In this state, when the fixing bolt is tightened further into the threaded hole of the nut member, both longitudinal ends of the nut member engage with the undersides of the lips on both sides of the opening in the rail, securing the rack to the rail.

JP 2017-172239 A International Publication No. 2017/022137 JP 2017-066692 A Japanese Patent Application Laid-Open No. 2017-089353 Japanese Patent Application Laid-Open No. 2007-198026

However, with the fixing structure disclosed in Patent Document 1, once the nut member is dropped into the rail, it cannot be held down by hand, and the nut member tends to move when the fixing bolt is tightened into the threaded hole of the nut member. This makes tightening the fixing bolt into the threaded hole of the nut member time-consuming.

The present invention takes the above into consideration and aims to provide a rail processing structure that makes it easy to secure objects to rails.

The rail fixing structure described in claim 1 comprises: a rail laid on the floor, the rail having a pair of lip portions forming an upper surface and an opening formed between the tip ends of the pair of lip portions; a fixed object placed on the rail; a base portion non-rotatably disposed inside the rail, with both end portions respectively engaging the undersides of the pair of lip portions; a fixing member having a male thread portion that protrudes above the rail through the opening from a portion of the base portion offset to one side in the width direction of the rail from the center of the base portion when viewed longitudinally; and a nut member that is tightened onto the male thread portion to fix the fixed object to the male thread portion.

According to the rail fixing structure of claim 1, the rail has a pair of lip portions forming the upper surface and an opening formed between the tip ends of the pair of lip portions. An object to be fixed is placed on the rail. This object to be fixed is fixed to the rail by a fixing member and a nut member.

The fixing member has a base portion and a male thread portion. The base portion of this fixing member is non-rotatably positioned inside the rail, and both end portions are engaged with the undersides of the pair of lip portions. Furthermore, when viewed from the longitudinal direction of the rail, the male thread portion of the fixing member protrudes above the rail through an opening from a location offset from the center of the base portion to one side in the rail width direction. By tightening a nut member onto this male thread portion, the fixing object is fixed to the male thread portion.

In this invention, the fixing member has a base portion and a male thread portion, so there is no need to attach the male thread portion to the base portion located inside the rail through an opening in the rail.

As mentioned above, the male threaded portion protrudes from a portion of the base portion that is offset from the center to one side of the rail's width when viewed from the longitudinal direction of the rail. Therefore, in this invention, when the base portion is dropped into an opening in the rail, by inserting the base portion into the opening from the end on the other side of the rail's width, the male threaded portion is less likely to interfere with one lip portion of the rail's width. This makes it easy to position the base portion inside the rail.

The base portion is also positioned inside the rail so that it cannot rotate. In other words, the base portion is unable to rotate when dropped into the rail through the opening. This prevents the nut member and base portion from rotating together when tightening the nut member onto the male threaded portion protruding upward from the rail opening. This makes it easy to tighten the nut member onto the male threaded portion.

The rail fixing structure described in claim 2 is the rail fixing structure described in claim 1, wherein the male thread portion is fixed to the base portion.

According to the rail fixing structure of claim 2, the male threaded portion is fixed to the base portion. This allows the nut member to be tightened onto the male threaded portion protruding upward from the opening in the rail with one hand, without having to hold down the male threaded portion. This makes it even easier to tighten the nut member onto the male threaded portion.

The rail fixing structure described in claim 3 is the rail fixing structure described in claim 1 or claim 2, in which the rail is embedded in the floor with the pair of lip portions exposed from the upper surface of the floor.

According to the rail fixing structure of claim 3, the rail is embedded in the floor with a pair of lip portions exposed from the upper surface of the floor. The present invention is particularly effective for such embedded rails, because with embedded rails, it is impossible or difficult to insert the base portion into the rail from the longitudinal end of the rail.

The rail fixing structure described in claim 4 is the rail fixing structure described in any one of claims 1 to 3, wherein, when viewed in the longitudinal direction of the rail, the pair of lip portions are inclined so that they are positioned downward toward the opening.

According to the rail fixing structure of claim 4, when viewed in the longitudinal direction of the rail, the pair of lip portions are inclined so that they are positioned downward toward the opening. When the pair of lip portions are inclined in this manner, the width of the opening between the pair of lip portions is wider than when the pair of lip portions are not inclined. This makes it even easier to position the base portion inside the rail.

The rail fixing structure described in claim 5 is the rail fixing structure described in any one of claims 1 to 4, wherein the fixing member includes a base member having a through hole at a position offset from the center to one side in the width direction of the rail when viewed in the longitudinal direction of the rail, the base member having both end portions that engage with the pair of lip portions, and a bolt member having the male thread portion that passes through the through hole and a head portion that is provided at the end of the male thread portion and engages with the underside of the base member.

According to the rail fixing structure of claim 5, the fixing member has a base member as a base portion and a bolt member. The base member has a through hole at a position offset from the center to one side in the rail width direction when viewed in the longitudinal direction of the rail, and both ends are engaged with a pair of lip portions. The bolt member has a male thread portion that passes through the through hole and a head portion that is provided at the end of the male thread portion and engages with the underside of the base member.

In this way, the present invention allows for the formation of a fixing member with a simple structure.

As described above, the present invention makes it easy to secure an object to a rail.

1 is an elevation view showing a pair of rails and a rack to which a rail fixing structure according to one embodiment is applied. FIG. 2 is a plan view of the rack shown in FIG. 1 . 2 is a cross-sectional view showing the rail, the fixing member, and the nut member shown in FIG. 1. FIG. 4 is a plan view of the rail, fixing member, and nut member shown in FIG. 3 . 4A and 4B are cross-sectional views corresponding to FIG. 3, illustrating the process of dropping the fixing member into the inside of the rail. 4A and 4B are cross-sectional views corresponding to FIG. 3, illustrating the process of dropping the fixing member into the inside of the rail. 4 is a cross-sectional view corresponding to FIG. 3, showing a modified example of the rail shown in FIG. 3. FIG.

One embodiment will be described below with reference to the drawings.

(rail fixing structure)
1 shows a pair of rails 40 to which the rail fixing structure according to this embodiment is applied, and a rack 10. The pair of rails 40 are laid substantially parallel to one another on a floor 30 of a server room or the like. A bracket 20 for the rack 10 is fixed to the pair of rails 40 via fixing members 50 and nut members 70.

(rack)
The rack 10 is, for example, a server rack that is installed on a floor 30 and is installed on a pair of rails 40. The rack 10 includes a housing 12, a plurality of casters 14 (four in this embodiment), and a pair of brackets 20.

The housing 12 is box-shaped and is placed on a pair of rails 40. A number of casters 14 and a pair of brackets 20 are attached to the underside 12L of the housing 12.

A number of casters 14 are attached to the four corners of the underside 12L of the housing 12. These casters 14 support the underside 12L of the housing 12 in a state where it is raised above the floor 30. As shown in FIG. 2, the casters 14 are positioned so that they do not overlap with the pair of rails 40 in a plan view. The casters 14 can be omitted as appropriate.

The pair of brackets 20 are attached to the underside 12L of the housing 12. The pair of brackets 20 are also arranged along the pair of rails 40. As shown in FIG. 1, the brackets 20 are formed, for example, from L-shaped steel.

The bracket 20 has a vertical wall portion 22 that extends downward from the underside 12L of the housing 12, and a flange portion 24 that extends laterally from the lower end of the vertical wall portion 22 and is placed on the rail 40. The bracket 20 is an example of a fixed object.

(rail)
As shown in Figure 3, each rail 40 is an embedded rail (embedded rail) that is embedded in the floor 30. Specifically, the floor 30 is a reinforced concrete slab. A groove 32 with a rectangular cross section is formed in the upper surface of the floor 30. A pair of fixing hardware 34 is attached to the bottom surface 32L of the groove 32.

The pair of fixing hardware 34 is formed, for example, from L-shaped steel and is arranged opposite each other in the width direction of the groove 32. The pair of fixing hardware 34 is fixed to the bottom surface 32L of the groove 32 by anchor bolts 36 and nuts 37 embedded in the floor 30. The anchor bolts 36 and nuts 37 allow the level of the pair of fixing hardware 34 to be adjusted.

The lower part of the rail 40 is positioned between the upper parts of the pair of fixing hardware 34. The lower part of the rail 40 is fixed to the upper parts of this pair of fixing hardware 34 by welding or the like. The rail 40 is formed, for example, from lip channel steel.

The rail 40 is a long member with a C-shaped cross section and an opening 48 formed on its upper surface. In other words, the rail 40 is a long member with an open C-shaped cross section and an opening 48 formed on its upper surface. The rail 40 has a bottom wall portion 42, a pair of side wall portions 44, and a pair of lip portions 46.

The bottom wall 42 is disposed substantially horizontally and forms the underside of the rail 40. A pair of side walls 44 are provided at both ends of the bottom wall 42 in the width direction of the rail 40 (direction of arrow W, hereinafter referred to as the "rail width direction").

The pair of side walls 44 face each other in the rail width direction (arrow W direction) and form the side surfaces of the rail 40 (open cross-section portion). A pair of lip portions 46 are provided at the upper ends of the pair of side walls 44.

A pair of lip portions 46 extend inward from the upper ends of the pair of side wall portions 44 and form the upper surface of the rail 40 (open cross-sectional portion). An opening 48 extending in the longitudinal direction of the rail 40 is formed between the tip ends 46T of the pair of lip portions 46. When viewed from the longitudinal direction of the rail 40, the pair of lip portions 46 are inclined so that they are positioned downward toward the opening 48.

The rail 40 is embedded in a cement-based filler 38 such as grout or mortar that has been filled into the groove 33, with a pair of lip portions 46 and an opening 48 exposed from the top surface of the floor 30.

The pair of lip portions 46 are formed symmetrically when viewed from the longitudinal direction of the rail 40, and the opening 48 is located in the center of the rail width.

(Fixing member)
The fixing member 50 has a base member 52 and a bolt member 60. In the following, unless otherwise specified, the configuration of the fixing member 50 and the nut member 70 will be described based on the posture in which the fixing member 50 is fixed to the rail 40.

As shown in Figure 4, the base member (base plate) 52 is formed of a metal plate or the like and has a rectangular shape in a plan view. This base member 52 is arranged inside the rail 40 so that it cannot rotate.

More specifically, when the base member 52 is positioned substantially horizontally inside the rail 40, the diagonal length F of the base member 52 is longer than the distance P between the inner wall surfaces of the pair of side wall portions 44 (F>P) so that rotation of the base member 52 around the vertical axis is restricted. This prevents the base member 52 from rotating when the nut member 70 is tightened onto the male thread portion 62 of the bolt member 60 (described below).

The planar shape and size of the base member 52 are not limited to those described above. The planar shape and size of the base member 52 can be changed as appropriate as long as the pair of side walls 44 can restrict rotation of the base member 52 around the vertical axis when the base member 52 is positioned horizontally inside the rail 40.

As shown in Figure 3, when viewed from the longitudinal direction of the rail 40, the ends 52E1 and 52E2 on both sides of the base member 52 in the rail width direction (arrow W direction) are engaged with the undersides of the pair of lip portions 46. This prevents the base member 52 from slipping out of the opening 48 of the rail 40.

A through hole 54 is formed in the base member 52. The through hole 54 is a circular hole that penetrates the base member 52 in the vertical direction (thickness direction). When viewed from the longitudinal direction of the rail 40, this through hole 54 is positioned offset to one side in the rail width direction (arrow W direction) from the center C of the base member 52. The male thread portion 62 of the bolt member 60 is inserted into this through hole 54.

(Bolt component)
The bolt member 60 has a male threaded portion 62 and a head portion 64 provided at the end of the male threaded portion 62. The male threaded portion 62 is inserted into the through-hole 54 of the base member 52 from below. When viewed in the longitudinal direction of the rail 40, the male threaded portion 62 is positioned at a position shifted to one side in the rail width direction from the center C of the base member 52.

The head 64 of the bolt member 60 is engaged with the underside of the base member 52 and fixed to the underside of the base member 52 by welding or the like. This allows the male thread portion 62 of the bolt member 60 to be fixed to the base member 52 via the head 64.

The male thread portion 62 of the bolt member 60 protrudes above the rail 40 through the opening 48 and penetrates the flange portion 24 of the bracket 20 in the vertical direction. Specifically, the flange portion 24 rests on a pair of lip portions 46 of the rail 40.

A mounting hole 26 is formed in the flange portion 24. The mounting hole 26 is a circular through-hole that penetrates the flange portion 24 in the vertical direction (thickness direction). A male thread portion 62 is inserted into this mounting hole 26 from below.

A nut member 70 is fastened via a washer 72 to the male thread portion 62 that protrudes upward from the flange portion 24. The nut member 70 is engaged with the upper surface of the flange portion 24 via the washer 72. The base member 52, the pair of lip portions 46, and the flange portion 24 are clamped from both the top and bottom between the nut member 70 and the head 64 of the bolt member 60, thereby fixing the flange portion 24 to the rail 40.

As shown in FIG. 5A, when the rail 40 is viewed in the longitudinal direction, the width of the base member 52 (hereinafter referred to as the "lateral width V") is set to satisfy the following formulas (1) and (2).
B<V<P (1)
V<K (2)
however,
B: Opening width of the opening 48 P: Distance between the inner wall surfaces of the pair of side wall portions 44 of the rail 40 K: Distance between the tip end 46T of the lip portion 46 on one side in the rail width direction and the lower corner 43 on the other side in the rail width direction of the rail 40

As a result, as shown in Figures 5(A), 5(B), 6(A), and 6(B), when viewing the rail 40 in the longitudinal direction, the base member 52 can be inserted into the opening 48 of the rail 40 from the other end 52E2 side, and the base member 52 can be dropped into the interior of the rail 40.

Furthermore, as shown in FIG. 3, when the base member 52 is positioned horizontally inside the rail 40, the ends 52E1 and 52E2 on both sides of the base member 52 can engage with the undersides of the pair of lip portions 46.

Furthermore, as mentioned above, the male thread portion 62 of the bolt member 60 is positioned at a position offset from the center C of the base member 52 to one side in the rail width direction when viewed from the longitudinal direction of the rail 40. This allows one end portion 52E1 of the base member 52 to be inserted into the opening 48 of the rail 40 with the male thread portion 62 in contact with the tip end 46T of the lip portion 46 on the other side in the rail width direction, as shown in Figure 5 (B).

In other words, when viewing the rail 40 in the longitudinal direction, the male thread portion 62 is positioned offset from the center C of the base member 52 to one side in the rail width direction so that one end 52E1 of the base member 52 can be inserted into the opening 48 of the rail 40 with the male thread portion 62 in contact with the tip 46T of the lip portion 46 on the other side in the rail width direction.

As shown in FIG. 5B, when the rail 40 is viewed in the longitudinal direction, the distance d (eccentricity) from the center C of the base member 52 to the center of the male thread portion 62 is set to satisfy, for example, the following equation (3).
V/2+R-Bsinθ<d<V/2-R (3)
however,
R: Radius of the male thread portion 62 θ: Inclination angle of a straight line connecting the tip end 46T of the lip portion 46 on one side in the rail width direction and the lower corner 43 of the rail 40 on the other side in the rail width direction with respect to the bottom wall portion 42 when viewing the rail 40 in the longitudinal direction

(Construction method for rail fixing structure)
Next, an example of a method for constructing the rail fixing structure according to this embodiment will be described.

(Drop-in process)
First, the dropping step will be described. In the dropping step, the base member 52 is inserted into the opening 48 of the rail 40 from the other end 52E2 side, as shown in Fig. 5A.

Next, as shown in Figure 5(B), the other end 52E2 of the base member 52 is moved toward the lower corner 43 on the other side of the rail 40 in the rail width direction so that one end 52E1 of the base member 52 does not interfere with the tip 46T of the lip portion 46 on one side of the rail width direction.

Next, as shown in Figure 6(A), the base member 52 is rotated around the other end 52E2 of the base member 52 so that one end 52E1 is lowered. As a result, as shown in Figure 6(B), one end 52E1 of the base member 52 passes through the opening 48, and the base member 52 is dropped inside the rail 40.

As a result, the top surface of the head 64 of the bolt member 60 rests on the upper surface of the bottom wall portion 42 of the rail 40, and the base member 52 assumes a substantially horizontal position. In this state, the male thread portion 62 of the bolt member 60 protrudes above the rail 40 through the opening 48. In other words, the overall length L of the bolt member 60 is greater than the height H of the side wall portion 44 of the rail 40 (L > H).

(Tightening process)
Next, the tightening process will be described. In the tightening process, first, as shown in Figure 6 (B), the flange portion 24 of the bracket 20 is placed on the pair of lip portions 46 of the rail 40. At this time, the male thread portion 62 of the bolt member 60 is inserted into the mounting hole 26 of the flange portion 24. Next, the nut member 70 is tightened onto the male thread portion 62.

Here, the head 64 of the bolt member 60 is fixed to the underside of the base member 52 by welding or the like. Furthermore, when the base member 52 attempts to rotate around the bolt member 60, the ends 52E1 and 52E2 on both sides of the base member 52 interfere with the inner wall surfaces of the pair of side wall portions 44 of the rail 40. As a result, co-rotation of the nut member 70 and the base member 52 is suppressed.

In this state, when the nut member 70 is further tightened onto the male thread portion 62 of the bolt member 60, the bolt member 60 and base member 52 rise relative to the rail 40. Then, as shown in Figure 3, one end 52E1 and the other end 52E2 of the base member 52 engage with the lower surfaces of the pair of lip portions 46, respectively, and the flange portion 24 is fixed to the rail 40.

(effect)
Next, the operation of this embodiment will be described.

As shown in FIG. 3, in this embodiment, the rail 40 has a pair of lip portions 46 that form the upper surface, and an opening 48 formed between the tip ends 46T of the pair of lip portions 46. The flange portion 24 of the bracket 20 is also disposed on the rail 40. This flange portion 24 is fixed to the rail 40 by a fixing member 50 and a nut member 70.

The fixing member 50 includes a base member 52 and a bolt member 60. The base member 52 is non-rotatably positioned inside the rail 40, and its opposite ends 52E1, 52E2 are engaged with the undersides of the pair of lip portions 46, respectively. This prevents the base member 52 from slipping out of the opening 48 in the rail 40.

Furthermore, when viewed in the longitudinal direction of the rail 40, the male thread portion 62 of the bolt member 60 protrudes above the rail 40 through the opening 48 from a location offset to one side in the rail width direction from the center C of the base member 52. The flange portion 24 of the bracket 20 is fixed to the male thread portion 62 by tightening a nut member 70 onto the male thread portion 62.

Here, the fixing member 50 has a base member 52 and a bolt member 60, and the base member 52 is placed inside the rail 40 with the bolt member 60 attached to the base member 52 in advance. Therefore, in this embodiment, there is no need to attach the bolt member 60 to the base member 52 placed inside the rail 40.

Furthermore, as described above, the male thread portion 62 of the bolt member 60 protrudes from a portion of the base member 52 that is offset from the center C to one side in the rail width direction when viewed from the longitudinal direction of the rail 40. Therefore, in this embodiment, when the base member 52 is dropped into the interior of the rail 40 through the opening 48, by inserting the base member 52 into the opening 48 from the other end 52E2 side, the male thread portion 62 is less likely to interfere with the tip end 46T of the lip portion 46 on the other side in the rail width direction. This makes it easy to position the base member 52 inside the rail 40.

Furthermore, in this embodiment, when viewed in the longitudinal direction of the rail 40, the pair of lip portions 46 are inclined so that they are positioned downward as they approach the opening 48. As a result, in this embodiment, the width of the opening 48 between the pair of lip portions 46 is wider than when the pair of lip portions 46 are not inclined. This makes it even easier to position the base member 52 inside the rail 40.

In addition, in this embodiment, the base member 52 is positioned inside the rail 40 so that it cannot rotate. In other words, the base member 52 is unable to rotate when it is dropped into the rail 40 through the opening 48. This prevents the base member 52 from rotating together when the nut member 70 is tightened onto the male thread portion 62 of the bolt member 60 that protrudes upward from the opening 48 of the rail 40. Therefore, the nut member 70 can be easily tightened onto the male thread portion 62.

Furthermore, the male threaded portion 62 of the bolt member 60 is fixed to the base member 52 via the head portion 64. As a result, when tightening the nut member 70 onto the male threaded portion 62 protruding upward from the opening 48 of the rail 40, for example, the nut member 70 can be tightened onto the male threaded portion 62 with one hand without having to hold the male threaded portion 62 with one hand. This makes it even easier to tighten the nut member 70 onto the male threaded portion 62.

Furthermore, the rail 40 is embedded in the floor 30 with the opening 48 exposed from the top surface of the floor 30. This embodiment is particularly effective for such embedded rails 40. This is because with embedded rails 40, it is not possible or difficult to insert the base member 52 into the interior of the rail 40 from the longitudinal end of the rail 40.

In this embodiment, the fixing member 50 includes a base member 52 and a bolt member 60. The base member 52 has a through hole 54 at a location offset from the center to one side in the rail width direction when viewed longitudinally of the rail 40, and both end portions 52E1, 52E2 are engaged with the undersides of the pair of lip portions 46. The bolt member 60 has a male threaded portion 62 that passes through the through hole 54 and a head portion 64 that is provided at the end of the male threaded portion 62 and engages with the underside of the base member 52.

In this way, in this embodiment, the fixing member 50 can be formed with a simple configuration.

(Modification)
Next, a modification of the above embodiment will be described.

In the above embodiment, the pair of lip portions 46 of the rail 40 are inclined. However, for example, as in the modified example shown in Figure 7, the pair of lip portions 46 may be substantially horizontal rather than inclined. Furthermore, when viewing the rail 40 in the longitudinal direction, the width V of the base member 52 and the distance S from the other end 52E2 of the base member 52 to the center of the male thread portion 62 can be calculated using the following equations (4) and (5). For convenience, the plate thicknesses of the rail 40 and base member 52 are ignored in the following calculations.

however,
S': distance from the other end of the base member in the rail width direction to the outer circumferential surface of the male thread portion, X: rail width, Y: rail height, Z: width of the rail lip portion, W: diameter of the male thread portion.

In addition, in the above embodiment, the bolt member 60 is fixed to the base member 52. However, the bolt member 60 does not necessarily have to be fixed to the base member 52; for example, the male threaded portion 62 may be rotatably inserted into the through-hole 54 of the base member 52. In this case, for example, the nut member 70 may be tightened onto the male threaded portion 62 while holding the male threaded portion 62 of the bolt member 60 by hand.

Furthermore, in the above embodiment, the male thread portion 62 of the bolt member 60 passes through the through hole 54 of the base member 52. However, for example, a stud bolt as a male thread portion may be fixed by welding or the like to the upper surface of the base member 52 as a base portion.

Furthermore, in the above embodiment, the rail 40 is formed with a C-shaped cross section. However, the rail 40 only needs to have a closed upper cross section of a C-shaped cross section. For example, flange portions extending outward may be provided at the upper ends of the pair of side wall portions 44 of the rail 40.

Furthermore, in the above embodiment, the rails 40 are embedded in the floor 30. However, the rails 40 are not limited to being embedded, and may be rails laid on the upper surface of the floor 30.

Furthermore, in the above embodiment, the fixed object is the bracket 20 for the rack 10. However, the fixed object is not limited to the bracket 20 for the rack 10, and may be the frame of the rack 10 or other components fixed to the rail 40.

The above describes one embodiment of the present invention, but the present invention is not limited to this embodiment. One embodiment and various modified examples may be used in appropriate combination, and the present invention can of course be implemented in various forms without departing from the spirit of the present invention.

20 Bracket (fixed object)
30 Floor 40 Rail 46 Lip portion 46T Tip portion 48 Opening 50 Fixing member 52 Base member (base portion)
52E1 One end of the base member (end of the base)
52E2 Other end of base member (end of base)
54 Through-hole 60 Bolt member 62 Male thread portion 64 Head 70 Nut member C Center (center of base member)

Claims (5)

a rail having a pair of lip portions forming an upper surface and an opening formed between tip ends of the pair of lip portions, the rail being laid on a floor;
a fixed object disposed on the rail;
a fixing member including a base portion that is non-rotatably disposed inside the rail, and whose opposite ends are engaged with the lower surfaces of the pair of lip portions, and a male screw portion that protrudes above the rail through the opening from a portion of the base portion that is shifted to one side in the width direction of the rail from the center of the base portion when viewed in the longitudinal direction of the rail;
a nut member that is fastened to the male screw portion and fixes the object to the male screw portion;
A rail fixing structure comprising: The male thread portion is fixed to the base portion.
The rail fixing structure according to claim 1 . The rail is embedded in the floor with the pair of lip portions exposed from the upper surface of the floor.
The rail fixing structure according to claim 1 or 2. When viewed from the longitudinal direction of the rail, the pair of lip portions are inclined so as to be positioned downward toward the opening.
The rail fixing structure according to any one of claims 1 to 3. The fixing member is
a base member as the base portion, which has a through hole at a position shifted from the center to one side in the width direction of the rail when viewed from the longitudinal direction of the rail, and whose both end portions are engaged with the pair of lip portions,
a bolt member having the male screw portion that passes through the through hole and a head portion that is provided at an end of the male screw portion and engages with the lower surface of the base member;
having
The rail fixing structure according to any one of claims 1 to 4.