Connection structure for columnar members

Abstract

To provide a connection structure for wooden handrail posts, brackets, and suspension posts that is easy to install, has no restrictions on the installation location, and is robust. [Solution] The handrail post 2 has a housing section 21 which includes a flange housing hole 213 drilled into the bottom surface of the handrail post 2, a through shaft hole 212 drilled vertically upward from inside the flange housing hole 213, and a fastening hole 211 drilled from the front so as to communicate with the through shaft hole. The fastener 3 is composed of a flanged bolt 31, a nut 32, and a washer 33. The flanged bolt 31 has a shaft portion 311 and a flange portion 312, and the bottom surface of the flange portion 312 abuts against the floor 1 and is fixed to the floor 1. When the handrail post 2 is fixed on the upper surface of the floor 1, the fastener 3 does not penetrate into the interior of the floor 1, and its entirety is stored inside the housing section 21.

Description

Technical Field

[0001] The present invention relates to a connection structure for fixing a columnar member such as a handrail post of a handrail installed indoors to a surface to be joined of a column such as a floor.

Background Art

[0002] In a handrail located at a position adjacent to an indoor atrium, when the end of the handrail is at a position that cannot be fixed to a wall, the end portion is made to stand on its own only by the handrail post. For a handrail post located at such a position, for example, a tenon is provided at the lower end, a tenon hole is drilled in the floor beam to insert the tenon, and a drift pin is driven through the tenon and the tenon hole from the side surface of the floor beam for fixation, which is a method that has been adopted (Non-Patent Document 1, Non-Patent Document 2). While this method provides a neat finish and enables firm fixation, it requires advanced skills for joint processing, and in addition, when the position where the handrail post is to be erected on the floor beam is at a joint portion with another beam, there is a problem that the joint processing becomes even more difficult.

[0003] As a method for fixing a handrail post to a floor that does not require joint processing on a floor beam, for example, a method is known in which a column support is fixed to the upper surface of a floor material with wood screws or the like, a fitting portion that matches the shape of the column support is recessed in the bottom surface of the leg portion of the handrail post, the column support is inserted into the fitting portion, and a fixing screw is screwed in from the side surface of the handrail post toward the column support for fixation. (Patent Document 1)

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Non-Patent Documents

[0005]

Non-Patent Document 1

[0006] However, in the method using the column support described above, the column support is housed in a penetration portion provided on the bottom surface of the leg of the handrail support. Therefore, the material of the column support must be a material with a moderate hardness that allows the fixing screws to penetrate (Patent Document 1 states "aluminum or other metal or fiber-reinforced plastic"), and it is considered difficult to provide sufficient strength (for example, strength that can withstand repeated leaning by a person).

[0007] Furthermore, Patent Document 1 discloses a variation of the above-mentioned method using a column support, in which the column support is made of a different metal material, fixing bolts are used instead of fixing screws, the fixing bolts are inserted through bolt holes drilled in the side surface of the handrail support, and then screwed into screw holes formed in the column support to fix it in place. However, with this method, it is difficult to align the bolt holes and screw holes, and there is a risk that the handrail support may become loose due to wood shrinkage caused by drying over time.

[0008] This invention was made in view of the above-mentioned conventional problems, and aims to provide a handrail support connection structure that has no restrictions on the installation location, is easy to install and does not require advanced skills from the installer, is durable, has a good aesthetic appearance and can be firmly fixed. [Means for solving the problem]

[0009] The handrail support post connection structure according to an embodiment of the present invention that solves the above problems is: A connection structure for fixing a handrail support post onto the upper surface of the floor using fasteners fixed to the floor, The aforementioned fastener consists of a flanged bolt having a shaft portion and a flange portion, a washer, and a nut. The flanged bolt is fixed to the floor by the bottom surface of the flange contacting the floor. The aforementioned handrail support post has a housing portion comprising a flange housing hole drilled into the bottom surface of the handrail support post, a through-shaft hole drilled vertically upward from inside the flange housing hole, and a fastening hole drilled from the front so as to communicate with the through-shaft hole. In the state in which the handrail support is fixed to the upper surface of the floor, the fixing device is characterized in that it does not penetrate into the interior of the floor, and the entire device is stored inside the housing. [Effects of the Invention]

[0010] The handrail support structure of the present invention is configured as described above, using a fixing device fixed to the upper surface of the floor and a handrail support having a housing inside, wherein the fixing device is fastened inside the handrail support to secure the handrail support. By using this structure, there are no restrictions on the installation location due to the floor structure, it is possible to finish with a good aesthetic appearance, and it is possible to provide a strong and durable handrail support connection structure that does not require advanced skills from the installer. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 shows (A) a front view and (B) a cross-sectional view (AA) of the handrail support post of the first embodiment of the present invention, fixed to the floor. [Figure 2] Figure 2 shows (A) a front view of a nut, a crescent washer, and a flanged bolt forming a fastener according to an embodiment of the present invention, (B) a plan view of the crescent washer, and (C) a plan view of the flanged bolt. [Figure 3] Figure 3 shows (A) a front view, (B) a bottom view, and (C) a cross-sectional view AA of a handrail support post according to an embodiment of the present invention. [Figure 4]Figure 4 is a perspective view showing the procedure for fixing a handrail post according to an embodiment of the present invention to a floor, where (A) shows the step of securing a flanged bolt to the floor, (B) shows the step of attaching the handrail post to the flanged bolt, and (C) shows the step of fastening the handrail post and the flanged bolt with a nut. [Figure 5] Figure 5 is (A) a plan view and (B) an A-A cross-sectional view showing a state in which a bracket according to the second embodiment of the present invention is fixed to a wall surface. [Figure 6] Figure 6 is (A) a front view and (B) an A-A cross-sectional view showing a state in which a suspension hanger according to the third embodiment is fixed to the lower surface of a beam. [Mode for Carrying Out the Invention]

[0012] The structure of the handrail post according to the embodiment of the present invention will be described below with reference to the drawings. First, the basic configuration of the connection portion between the handrail post and the floor according to the present embodiment will be described using Figure 1. (First Embodiment)

[0013] As shown in Figure 1(A), the handrail post 2 is erected on the upper surface of the floor 1. This handrail post 2 is an example of the columnar member according to the present invention, and the floor 1 is an example of the joined surface according to the present invention. The material of the handrail post 2 is wood, and as shown in Figure 1(B), it has an accommodating portion 21 inside, which is constituted by a fastening hole 211, a through-shaft hole 212 and a flange portion accommodating hole 213 from top to bottom. As shown in Figure 1(A), the fastening hole 211 is drilled in the front face of the handrail post 2, and is covered with a wooden plug 22. The material of the wooden plug 22 does not necessarily need to be wood as long as it harmonizes with the surface of the handrail post 2 in terms of appearance.

[0014] As shown in Figure 1(B), in the state where the handrail post 2 is fixed to the floor 1, the entire fixture 3 is stored inside the accommodating portion 21.

[0015] Next, the configuration of the fixture 3 according to the present embodiment will be described with reference to Figure 1 and Figure 2. As shown in Figure 2, the fixture 3 is composed of a flanged bolt 31, a nut 32, and a washer 33, and as described above, the fixture 3 is in a state of being stored inside the housing portion 21 when the handrail post 2 is fixed to the floor 1.

[0016] As shown in Figure 2(A), the flanged bolt 31 has a disc-shaped flange portion 312 and an elongated cylindrical shaft portion 311, wherein the lower end of the shaft portion 311 is welded to the center of the flange portion 312, and threads are formed on part or the entirety of the upper end side of the side surface of the shaft portion 311 so as to be screwable into the nut 32. The planar shape of the flange portion 312 is a perfect circle as shown in Figure 2(C), and a plurality of screw holes 314 are bored so as to surround the shaft portion 311. As shown in Figure 1(A), the flanged bolt 31 is fixed to the floor 1 by a wood screw (not shown) screwed in from the screw hole 314 in a state where the handrail post 2 is fixed.

[0017] The washer 33 of the present embodiment is a "half-moon washer" which is a columnar body having a substantially half-moon shape in front view as shown in Figure 2(A), and has a substantially square shape with substantially equal lateral width and longitudinal width in plan view as shown in Figure 2(B). As shown in Figure 2(B), the bolt hole 331 of the washer 33 is bored substantially at the center in plan view with a diameter slightly larger than the diameter of the shaft portion 311 of the flanged bolt 31. The planar shape of the washer 33 does not necessarily need to be substantially square, and may be, for example, a rectangle other than a substantially square. However, in consideration of cost, it is preferable that the planar shape is a square with equal left-right width and depth length in front view, or a rectangle with a slightly longer depth direction, because the material volume can be saved while ensuring strength.

[0018] Next, the configuration of the handrail support 2 according to this embodiment will be explained using Figure 3. As shown in Figure 3(A), fastening holes 211 are formed in the left and right center of the front of the handrail support 2. In this embodiment, the fastening holes 211 are so-called "blind holes" that do not penetrate the handrail support 2, and are drilled to a size that can accommodate at least a washer 33 and a nut 32. In this embodiment, by making the fastening holes 211 blind holes, only one side of the handrail support 2 can be covered with a wooden plug 22, leaving the other side as bare material. Furthermore, the amount of material missing from the handrail support 2 in the flat cross-section portion of the fastening hole 211 is smaller than if it were a through hole, thus avoiding a reduction in the strength of the handrail support 2, which is desirable. Furthermore, in this embodiment, the vertical cross-sectional shape of the fastening hole 211 is a perfect circle, and its radius is equal to the radius of the arc portion of the washer 33, which is a crescent-shaped washer, when viewed from the front. However, the vertical cross-sectional shape of the fastening hole 211 is not limited to a perfect circle. If the shape of the washer 33 is other than a crescent-shaped washer, and its lower surface coincides with the bottom surface of the fastening hole 211, the vertical cross-sectional shape of the fastening hole 211 may be a shape other than a perfect circle, such as a rectangle.

[0019] As shown in Figure 3(B), a flange housing hole 213 for accommodating the flange portion 312 of the flanged bolt 31 is carved into the center of the bottom surface of the handrail support 2. The flange housing hole 213 is a cylindrical space that is the same as or slightly larger than the outer shape of the disc-shaped flange portion 312, and the circular shape of its bottom surface is the same as or slightly larger than the circular shape of the flange portion 312 in plan view, and its height is carved to be the same as or slightly higher than the height of the flange portion 312.

[0020] The through-hole 212 is a space for accommodating the shaft portion 311 of the flanged bolt 31. As shown in Figures 3(B) and 3(C), it is drilled vertically upward from the center of the bottom view of the flange portion accommodating hole 213 through the inside of the handrail support 2 and communicates with the fastening hole 211. That is, as shown in Figure 3(C), the fastening hole 211 and the flange portion accommodating hole 213 communicate inside the handrail support 2 via the through-hole 212, and these communicating fastening hole 211, through-hole 212, and flange portion accommodating hole 213 together form the accommodating portion 21.

[0021] Next, the procedure for fixing the handrail support post of the embodiment of the present invention to the floor will be explained using Figure 4. The first step is to place the flanged bolt 31 in a predetermined position on the floor 1, and to screw the wood screw 4 into the floor 1 through the screw hole 34, as shown in Figure 4(A), thereby fixing the flanged bolt 31 to the floor 1.

[0022] When screwing the wood screw 4 into the floor 1, depending on the structure of the floor 1, it may interfere with beam support fittings or the like inside the floor 1, preventing it from being screwed all the way in. In such cases, in the embodiment of the present invention, the flange portion can be rotated around the center of the shaft portion 311 to move the position of the screw hole 314, thereby avoiding interference with the beam support fittings or the like. That is, since the fastener 3 including the flanged bolt 31 is installed on the upper surface of the floor 1 and does not penetrate into the interior of the floor 1, the fastener 3 does not interfere with beam support fittings or the like inside the floor 1, and it is possible to fix the flanged bolt 31 to the floor 1 by avoiding interference between the beam support fittings or the wood screw 4 and the like simply by moving the screw hole 314. Thus, since the flange portion 312 is perfectly circular in plan view, it is easy to rotate the flanged bolt 311 to the position of the screw hole 314 after positioning it, and interference between the beam support fittings or the wood screw 4 and the like can be easily avoided.

[0023] The second step, as shown in Figure 4(B), is to insert the shaft portion 311 of the flanged bolt 31 fixed to the floor 1 into the through-hole 212 at the bottom of the handrail support 2. At this time, when the upper end of the shaft portion 311 of the flanged bolt 31 reaches the fastening hole 211, a washer 33 and a nut 32 are inserted through the front opening of the fastening hole 211, the upper end of the shaft portion 311 that has reached the fastening hole 211 is inserted through the washer 33, and the nut 32 is screwed on.

[0024] When screwing this nut 32 onto the upper end of the shaft portion 311, the final adjustment of the front angle of the handrail support 2 is performed. In carrying out this procedure, the outer shape of the flanged bolt 31 and the internal shapes of the flange housing hole 213 and through shaft hole 212 are almost identical, and both are rotating bodies, so the final adjustment of the front angle of the handrail support 2 can be easily performed.

[0025] The third step is to fully fasten the nut 32 and cover the opening of the fastening hole 211 with the wooden plug 22, as shown in Figure 4(C), to achieve a good aesthetic finish. At this time, the plan view shape of the washer 33 is a rectangle in which the width and height are approximately equal or the height is longer, and the lower surface of the washer 33 is in contact with the inner surface of the fastening hole 211 with the same curved surface, so that it can firmly withstand a strong horizontal load applied to the upper end of the handrail support 2 from any direction.

[0026] Thus, in the third step, the handrail support 2 is fastened by clamping the inside of the handrail support 2 with the flange 312 and nut 32 from the longitudinal direction of the handrail support 2, so that loosening due to wood shrinkage does not occur, and it can be used safely for a long period of time. (Second Embodiment)

[0027] Next, the basic configuration of the connection between the bracket 2 and the wall surface 1 according to this embodiment will be explained using Figure 5. This bracket 2 is an example of a columnar member according to the present invention, and the wall surface 1 is an example of a surface to be joined according to the present invention. In this embodiment, the wall surface 1 does not necessarily have to be a state in which wall material such as gypsum board has been installed, and may be a vertical surface such as a column or stud that serves as the base for the wall surface.

[0028] As shown in the plan view of Figure 5(A), the bracket 2 is attached to the wall surface 1. The material of the bracket 2 is wood, and as shown in the cross-sectional view AA of Figure 5(B), it has a housing section 21 inside, which is composed of a fastening hole 211, a through-shaft hole 212, and a flange housing hole 213 from top to bottom. The fastening hole 211 is drilled in the upper surface of the bracket 2, as shown in Figure 5(A), and is covered with a wooden plug 22. The surface on which the fastening hole 211 is drilled may be the side or bottom surface depending on the use of the bracket. Possible uses for the bracket 2 include, for example, support for a girder of an outdoor rain shield, or support for a shelf board of an indoor shelf. For these uses, the position of the fastening hole 211 on the upper surface of the bracket 2 is relatively inconspicuous, but if there is an intention to show the upper surface of the bracket 2, the position of the fastening hole 211 can be on the side or bottom surface of the bracket 2. Furthermore, the material of the wooden plug 22 does not necessarily have to be wood, as long as it harmonizes aesthetically with the surface of the bracket 2. As shown in Figure 5(B), with the bracket 2 fixed to the wall surface 1, the entire fastener 3 is stored inside the housing section 21.

[0029] Next, the configuration of the fastener 3 according to this embodiment will be explained using Figures 5 and 2. As shown in Figure 2, the fastener 3 is composed of a flanged bolt 31, a nut 32, and a washer 33, just like in the first embodiment, and as described above, the fastener 3 is stored inside the housing section 21 when the bracket 2 is fixed to the wall surface 1.

[0030] The configuration of the flanged bolt 31, nut 32, and washer 33 is the same as in the first embodiment. As shown in Figure 5(A), the flanged bolt 31 is fixed to the wall surface 1 by a wood screw (not shown) screwed into the screw hole 314 while the bracket 2 is fixed.

[0031] Next, the configuration of the columnar member 2, which is the bracket 2, according to this embodiment will be explained using Figure 3. In this embodiment, Figure 3(A) is a plan view of the bracket 2, Figure 3(B) is a front view, and Figure 3(C) is a cross-sectional view along line AA. The surface shown in the front view of the bracket 2 is the surface that faces the wall surface, which is the surface to be joined in this embodiment. The configuration of the bracket 2 in this embodiment is the same as that of the handrail support 2 in the first embodiment, including the internal fastening hole 211, through-shaft hole 212, and flange housing hole 213.

[0032] Next, the procedure for fixing the columnar member 2, which is the bracket 2 according to this embodiment, to the wall surface, which is the surface to be joined in this embodiment, will be explained using Figure 4. In this embodiment, in each diagram of Figure 4, the lower side is the direction of the wall surface, which is the surface to be joined.

[0033] In the first step, as shown in Figure 4(A), the flanged bolt 31 is positioned at a predetermined location on the wall surface 1, and the wood screw 4 is screwed into the wall surface 1 through the screw hole 34 to fix the flanged bolt 31 to the wall surface 1. When screwing the wood screw 4 into the wall surface 1, depending on the structure of the wall surface 1, it may interfere with beam support fittings or the like inside the wall surface 1, preventing it from being screwed all the way to the back of the wall surface 1. In such cases, in the embodiment of the present invention, the flange portion is rotated around the center of the shaft portion 311 as an axis to move the position of the screw hole 314, thereby avoiding interference with the beam support fittings or the like. That is, since the fixing device 3 including the flanged bolt 31 does not penetrate into the interior of the wall surface 1, the fixing device 3 does not interfere with beam support fittings or the like inside the wall surface 1, and it is possible to fix the flanged bolt 31 to the wall surface 1 by avoiding interference between the beam support fittings or the like and the wood screw 4 simply by moving the screw hole 314. Thus, since the flange portion 312 is perfectly circular in plan view, it is easy to rotate the flanged bolt 31 by the position of the screw hole 314 after positioning it, and interference between the beam support fitting and the wood screw 4 can be easily avoided.

[0034] In the second step, as shown in Figure 4(B), the shaft portion 311 of the flanged bolt 31 fixed to the wall surface 1 is inserted into the through-hole 212. When the tip of the shaft portion 311 of the flanged bolt 31 reaches the fastening hole 211, the washer 33 and nut 32 are inserted through the front opening of the fastening hole 211. The upper end of the shaft portion 311 that has reached the fastening hole 211 is then inserted through the washer 33, and the nut 32 is screwed on.

[0035] When screwing the nut 32 onto the upper end of the shaft portion 311, the final adjustment of the angles of each face of the arm 2 other than the end face is performed. In carrying out this procedure, the outer shape of the flanged bolt 31 and the internal shapes of the flange housing hole 213 and the through-shaft hole 212 are almost identical and both are rotating bodies, so the final adjustment of the angles of each face of the arm 2 can be easily performed.

[0036] In the third step, as shown in Figure 4(C), the nut 32 is fully tightened, and the opening of the fastening hole 211 is covered with the wooden plug 22 to give it a good appearance. At this time, the plan view shape of the washer 33 is a rectangle in which the width and length are approximately equal or the length is longer, and the lower surface of the washer 33 is in contact with the inner surface of the fastening hole 211 with the same curved surface, so the bracket 2 can firmly withstand strong vertical loads. In this way, in the third step, the inside of the bracket 2 is fastened by sandwiching it between the flange 312 and the nut 32 from the longitudinal direction of the bracket 2, so loosening due to wood shrinkage does not occur, and it can be used safely for a long period of time. (Third embodiment)

[0037] Next, using Figure 6, the basic configuration of the connection portion between the support beam and the lower surface of the beam according to this embodiment will be explained. This support beam 2 is an example of a columnar member according to the present invention, and the lower surface of the beam 1 is an example of a surface to be joined according to the present invention. In this embodiment, the lower surface of the beam 1 includes the lower surface of joists, etc., and the ceiling surface directly attached to the lower surface of the beam, joists, etc.

[0038] As shown in the front view of Figure 6(A), the suspension post 2, which is an example of a columnar member according to this embodiment, is attached to the lower surface 1 of a beam, which is an example of a surface to be joined. The material of this beam is wood, and as shown in the cross-sectional view AA of Figure 6(B), it has a housing section 21 inside, which is composed of a flange housing hole 213, a through shaft hole 212, and a fastening hole 211 from top to bottom. The fastening hole 211 is drilled in the front of the suspension post 2, as shown in Figure 6(A), and is covered with a wooden plug 22. A common use of the suspension post 2 is as a vertical columnar member that suspends the lintel of a transom in a Japanese-style room.

[0039] As shown in Figure 6(B), with the suspension support 2 fixed to the lower surface 1 of the beam, the entire fastener 3 is stored inside the housing section 21.

[0040] Next, the configuration of the fastener 3 according to this embodiment will be explained using Figures 6 and 2. As shown in Figure 2, the fastener 3 is composed of a flanged bolt 31, a nut 32, and a washer 33, just like in the first and second embodiments, and as described above, the fastener 3 is stored inside the housing section 21 when the bracket 2 is fixed to the wall surface 1.

[0041] The configuration of the flanged bolt 31, nut 32, and washer 33 is the same as in the first and second embodiments. As shown in Figure 6(A), the flanged bolt 31 is fixed to the lower surface 1 of the beam by a wood screw (not shown) screwed into the screw hole 314 when the suspension support 2 is fixed.

[0042] Next, the configuration of the columnar member 2, the suspension support 2, according to this embodiment will be explained using Figure 3. In this embodiment, Figure 3(A) and Figure 3(C) are rotated 180 degrees vertically, with Figure 3(A) being a front view of the suspension support 2, Figure 3(B) being a top view, and Figure 3(C) being a cross-sectional view along line AA. The configuration of the suspension support 2 in this embodiment is the same as that of the handrail support 2 in the first embodiment and the arm 2 in the second embodiment, including the internal fastening holes 211, through-shaft holes 212, and flange housing holes 213.

[0043] Next, the procedure for fixing the columnar member 2, which is the suspension support 2 according to this embodiment, to the lower surface of the beam, which is the surface to be joined in this embodiment, will be explained using Figure 4. In this embodiment, each diagram in Figure 4 is oriented so that the lower side is the direction of the lower surface of the beam, which is the surface to be joined (the outer shape of the beam is not shown).

[0044] In the first step, as shown in Figure 4(A), the flanged bolt 31 is positioned at a predetermined location on the lower surface 1 of the beam, and the wood screw 4 is screwed into the lower surface 1 of the beam through the screw hole 34 to fix the flanged bolt 31 to the lower surface 1 of the beam. When screwing the wood screw 4 into the lower surface 1 of the beam, depending on the structure of the beam, it may interfere with beam support fittings etc. inside the beam, and may not be able to be screwed all the way into the beam. In such cases, in the embodiment of the present invention, by rotating the flange portion around the center of the shaft portion 311 as an axis and moving the position of the screw hole 314, interference with the beam support fittings etc. can be avoided. That is, since the fastener 3 including the flanged bolt 31 does not penetrate into the interior of the beam, the fastener 3 does not interfere with beam support fittings etc. inside the beam, and it is possible to fix the flanged bolt 31 to the wall surface 1 by avoiding interference between the beam support fittings etc. and the wood screw 4 simply by moving the screw hole 314. Thus, since the flange portion 312 is perfectly circular in plan view, it is easy to rotate the flanged bolt 31 by the position of the screw hole 314 after positioning it, and interference between the beam support fitting and the wood screw 4 can be easily avoided.

[0045] In the second step, as shown in Figure 4(B), the shaft portion 311 of the flanged bolt 31 fixed to the lower surface 1 of the beam is inserted into the through-hole 212. When the tip of the shaft portion 311 of the flanged bolt 31 reaches the fastening hole 211, the washer 33 and nut 32 are inserted through the front opening of the fastening hole 211. The upper end of the shaft portion 311 that has reached the fastening hole 211 is then inserted through the washer 33, and the nut 32 is screwed on.

[0046] When screwing the nut 32 onto the upper end of the shaft portion 311, the final adjustment of the angles of each face of the suspension bundle 2 other than the end face is performed. In carrying out this procedure, the outer shape of the flanged bolt 31 and the internal shapes of the flange housing hole 213 and the through shaft hole 212 are substantially the same and both are rotating bodies, so the final adjustment of the angles of each face of the suspension bundle 2 can be easily performed.

[0047] In the third step, as shown in Figure 4(C), the nut 32 is fully tightened, and the opening of the fastening hole 211 is covered with the wooden plug 22 to give it a good appearance. At this time, the plan view shape of the washer 33 is a rectangle in which the width and length are approximately equal or the length is longer, and the lower surface of the washer 33 is in contact with the inner surface of the fastening hole 211 with the same curved surface, so it can firmly withstand a strong horizontal load applied to the lower end of the support beam 2 from any direction. In this way, in the third step, the support beam 2 is fastened by sandwiching the inside of the support beam 2 with the flange portion 312 and the nut 32 from the longitudinal direction of the support beam 2, so loosening due to wood shrinkage does not occur, and it can be used safely for a long period of time. [Industrial applicability]

[0048] This invention can be applied to the connection structure of columnar members such as handrail posts. [Explanation of Symbols]

[0049] 1. Surfaces to be joined (floor, wall, underside of beam) 2. Columnar members (handrail posts, brackets, suspension posts) 21 Storage Unit 211 Fastening hole 212 Shaft hole 213 Flange housing hole 22 Wood plug 3 Fixtures 31 Flanged bolt 311 Shaft 312 Guard section 314 screw holes 32 nuts 33 Half-moon washer 4 wood screws

Claims

1. A connection structure for fixing a handrail support post onto the upper surface of the floor using fasteners fixed to the floor, The aforementioned fastener comprises a flanged bolt and a nut. The flanged bolt has a shaft portion and a flange portion, and the bottom surface of the flange portion abuts against the floor and is fixed to the floor. The aforementioned handrail support post is A flange housing hole is provided in the bottom surface of the handrail support post to accommodate the flange portion of the flanged bolt, A through-hole is drilled from the inside of the flange housing hole toward vertically upward, and accommodates a part of the shaft portion of the flanged bolt, A fastening hole is drilled from the side of the handrail support so as to communicate with the through-hole, and accommodates the upper end of the shaft portion of the flanged bolt and the nut, A handrail support post connection structure characterized by having a housing section equipped with the following.

2. The handrail support connection structure according to claim 1, characterized in that when the handrail support is fixed on the upper surface of the floor, the fixing device does not penetrate into the interior of the floor, and the entire device is stored inside the housing.

3. The handrail support connection structure according to claim 1, characterized in that the fastener comprises a washer provided between the opening on the upper end side of the through-shaft hole and the nut.

4. The fastening holes are circular in front view and drilled parallel to the floor surface. The washer is characterized by having a columnar shape with a roughly crescent-shaped base that fits onto the outer circumference of the circle. The handrail support post connection structure according to claim 3.

5. The length of the washer in the depth direction when the handrail support is fixed is characterized by being approximately the same as or slightly longer than the length in the left-right direction. The handrail support post connection structure according to claim 4.

6. The handrail support post connection structure according to claims 1 to 5, characterized in that the flange portion of the flanged bolt has a circular shape in plan view.

7. A connection structure in which the end of a columnar member is fixed to the surface to be joined using a fastener fixed to the surface to be joined, The aforementioned fastener comprises a flanged bolt and a nut. The flanged bolt has a shaft portion and a flange portion, and the bottom surface of the flange portion abuts against the surface to be joined and is fixed to the surface to be joined. The columnar member is, A flange portion receiving hole is provided on the end face of the columnar member on the side facing the joining surface, for accommodating the flange portion of the flanged bolt, A through-hole is drilled to communicate with the flange housing hole and accommodates at least a portion of the shaft portion of the flanged bolt, A fastening hole is drilled from the side of the columnar member so as to communicate with the through-hole, and at least the tip of the shaft portion of the flanged bolt is exposed. A columnar member connection structure characterized by having a housing section equipped with the following.

8. The columnar member connection structure according to claim 7, characterized in that the surface to be joined is a vertical surface.

9. The columnar member connection structure according to claim 7, characterized in that the surface to be joined is the ceiling surface or the lower surface of a horizontal member.

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