JP2008285941A - Backing steel member fixing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing structure of a backing steel member for mounting a handrail of a rising ALC wall easily constructible in a dry method while reducing cost with few members. <P>SOLUTION: An anchor pipe threaded on the inside of the upper end and provided at its lower part with a through hole for inserting an anchor rod is embedded in a lightweight cellular concrete panel, and a handrail fixing backing steel member formed of a bored strip steel plate is placed on the upper end face of the lightweight cellular concrete panel. A bolt penetrating a hole is screwed with a threaded part on the inside of the upper end of the anchor pipe to fix the handrail fixing backing steel member to the upper end face of the lightweight cellular concrete panel. A handrail support member is welded and fixed to the handrail fixing backing steel member to mount the handrail to the upper end face of the rising lightweight cellular concrete wall. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a handrail attachment structure for attaching a handrail to a rising wall such as a veranda, a balcony, a parapet, a corridor, and a staircase, which is configured using a lightweight cellular concrete panel (hereinafter referred to as an ALC panel). .

ALC panels are used for building walls, floors, roofs, and the like. Among these, when the ALC panel is used as a rising wall of a veranda or a staircase, the ALC panel used as the rising wall is provided with a substantially central portion in the width direction and a lower portion in the height direction and a lower intermediate portion. In addition, a structure that is attached to and supported by a building frame via a panel mounting bracket or the like is employed. As an example, a rising wall mounting structure as shown in FIG. 9 is known.
In the mounting structure of the rising wall shown in FIG. 9, two anchors 31 and 32 are embedded in the ALC panel 1 used as a veranda wall, and the embedded position is in the vertical direction with the lower portion of the ALC panel 1. It is located at the center of the ALC panel 1 in the width direction at two locations with the intermediate portion. The position of the intermediate part is usually located slightly below the center point of the ALC panel. The ALC panel 1 is attached to the building frame 7 via the mounting bracket 5 and the bolt 6 at two locations of the anchors 31 and 32.
The anchors 31 and 32 embedded in the ALC panel 1 are long L-shaped plates, have a length of 1/3 or more of the lateral width of the ALC panel 1, and one anchor nut at the center. It is the structure provided only.
An L-shaped angle 8 is welded and fixed to a building housing 7 such as a beam at the position on the inner surface side of the ALC panel 1 at the height of the anchor 31, and the back surface of the upright plate 8 a is inside the ALC panel 1. It is provided so as to contact the side surface.

Further, the lower fore edge surface 1e of the ALC panel 1 is placed on an L-shaped receiving angle 10, and is installed so that the inner side surface of the upright plate 10a is in contact with the inner side surface of the ALC panel 1, The lower edge surface 1e of the ALC panel 1 is received. The mounting bracket 5 is fixed to the upright plate 8 a of the L-shaped angle 8 and the upright plate 10 a of the L-shaped receiving angle 10 corresponding to the positions of the anchors 31 and 32 of the ALC panel 1.
According to this mounting structure, sufficient mounting strength can be easily provided, and the rising wall can be easily mounted on the building frame with a small number of mounting members (see, for example, Patent Document 1).

In this case, the rising wall is often provided with a handrail at the upper end of a veranda, a staircase, a corridor, etc. In addition to the basic structure of the panel, the side edge surfaces of the panel are slidably in contact with each other. There is known a structure in which an anchor member is planted at or near the center of the upper edge of the panel in the width direction of the panel, and a steel plate for attaching a handrail column is fixed to the anchor member.
As an example, as shown in FIG. 10, in addition to the above contents, it is disclosed that the anchor member and the panel base material are filled and fixed with a cement-based bonding material. Furthermore, in order to efficiently fix the steel plate to the anchor member with a nut, it has been disclosed to use a steel plate having a hole in advance (for example, see Patent Document 2).

In the example of the handrail attachment structure shown in FIG. 10, the ALC panel 1 does not use mortar or the like, and the side edge surfaces 1c are in direct contact with each other so as to be slidable. The joint portion 18 of the ALC panel 1 forms a real joint where the unevenness provided on the side edge 1c is engaged.
An anchor member 20 for fastening the handrail attachment member 19 is planted in the center portion in the lateral width direction of the upper edge surface 1d of the ALC panel 1. A male screw is threaded on the upper portion 20a of the anchor member 20, and the portion protrudes from the upper edge surface 1d of the ALC panel 1, and the remaining portion is formed in a hole drilled in the ALC panel 1 such as mortar. The adhesive member 21 is filled and fixed. As the handrail mounting member 19, a strip steel plate having a predetermined thickness provided with a hole 29 that penetrates the upper portion 20 a of the anchor member 20 is used. The anchor member 20 is penetrated through the hole 29, and the anchor member 20 A nut 23 is screwed onto the upper portion 20a via a washer 22, and is laid and fixed on the upper edge surface 1d.

A handrail support member 24 is welded and fixed at a predetermined interval on the upper surface of the handrail attachment member 19, and a headboard 25 through which the handrail support member 24 penetrates is placed on the handrail attachment member 19. A handrail 26 is fixed to the upper end portion of the handrail support member 24. The handrail support member 24 may be fixed to the upper surface of the handrail attachment member 19 using a locking member such as a screw.
With such a structure, when the handrail mounting member 19 is fastened, if the nut 23 is screwed and fixed to the male screw provided on the upper portion 20a of the anchor member 20, the structure is simple and the fixing work is easy. Can be fastened with sufficient tightness.

  As another example of the handrail mounting structure, as shown in FIG. 11, the mortar is poured into a void portion in the joint portion formed by abutting the panel side facets with each other, and the mortar is made of a steel bar such as a joint reinforcement. There is disclosed a structure in which an embedded member is inserted from above the ALC panel, a steel plate is fixed to the embedded member with a latch such as a nut, and a handrail column is fixed to the steel plate (for example, Patent Documents). 3).

In the example of FIG. 11, mortar is used as an adhesive member in the cylindrical gap M in the joint 18 formed by abutting the side edge surfaces 1c of the ALC panel 1 in which the semicylindrical recess 17 is formed. To cure the mortar. As a result, the adjacent ALC panels are integrated, and the joint portion 18 of the ALC panel 1 has strength, and also plays a role of distributing the load applied to the ALC panel to the adjacent panels.
When the mortar is poured, an anchor member 20 serving as a locking bracket having a screw portion formed at the upper end portion is prepared in advance, and the upper portion in the joint portion 18 between the ALC panels 1, 1, 1. The anchor member 20 is fixed with mortar by embedding the screw portion so as to protrude from the upper edge surface 1d of the ALC panel 1.
FIG. 12 is an external perspective view showing an example of the anchor member 20 used at this time. The anchor member 20 shown in FIG. 12 is formed by providing a threaded portion 36b at the upper end of a steel bar 36 and pressing a lower portion to form a plate-like portion 36a. If such an anchor member is used, the plate-like portion 36a is firmly fixed in the mortar, and it becomes easy to fix the handrail attaching member to the upper end portion by screwing with a screw cutting portion 36b.
Next, the handrail mounting member 19 is locked to the anchor member 20, which is a locking fitting protruding from the upper edge surface 1 d of the ALC panel 1, and is laid and fixed on the upper edge surface 1 d of the ALC panel 1. The handrail support member 24 is fixed to the handrail attachment member 19. More specifically, a handrail mounting member 19 made of a steel strip having a hole 29 is prepared in advance, and the anchor member 20 (locking metal fitting) is passed through the hole 29 of the handrail mounting member 19. Then, the handrail mounting member 19 is laid and fixed on the upper edge surface 1d of the ALC panel 1 by screwing the nut 23 onto the threaded portion of the anchor member upper portion 20a from above the handrail mounting member 19.

In the example of FIG. 11, as in the example of Patent Document 2, it is disclosed that a steel plate in which a hole through which an embedded anchor member penetrates is used in advance and a handrail mounting member is directly welded to the steel plate. .
By using such an anchor member as a locking bracket and laying and fixing the handrail mounting member using a nut, it is possible to mount with fewer members, so the cost is further reduced, and the installation work It will be easier.
In addition, even if the ALC panel is shaken, the handrail mounting member will stick to the upper edge of the ALC panel and will not lift up at all. In addition, since the load applied to the ALC panel is distributed to the adjacent panels, the ALC wall structure with a more sturdy handrail is assumed.
In addition, since the mortar solidifies several times the strength of the ALC panel after solidification and integrates the adjacent ALC panels, the anchor member is said to be a stronger anchor for the handrail part and the handrail attachment member.

In Patent Document 2, a cement-based binder is used, and in Patent Document 3, mortar is used to fix the anchor member to the ALC. In this case, it became a wet construction method in which materials and water were mixed and applied on site, and had the following problems.
-It requires a lot of work because it requires preparation and kneading of water and powder.
・ When filling a hole or round groove with cement-based binder or mortar, the site is likely to get dirty.
・ A curing period is required, and the construction period becomes longer.
In addition, in Patent Document 3,
-It is necessary to remove the powder adhering to the inner surface of the hole in which the anchor member is implanted in order to ensure the adhesive strength between the cement-based binder and the ALC, but the operation is complicated.
There were issues such as.
Japanese Patent Laid-Open No. 09-203151 JP 2000-129773 A JP 09-317120 A

  The present invention has been made in order to solve the above-mentioned problems, and when attaching a handrail to the top end of a rising wall constructed of an ALC panel, fixing a handrail base that can stably obtain a necessary fixing strength in a dry type To propose a structure.

In order to solve the above-mentioned problems, the present invention is a structure in which a base steel material for attaching a handrail is fixed to an upper end small edge surface of a rising wall constructed of a lightweight cellular concrete panel, and has an internal thread portion on the inner surface of one end. An anchor pipe with a through hole at the end is embedded in the lightweight cellular concrete panel with the female thread part on the upper side and the through hole on the lower side so that the female thread part is exposed at the upper edge of the lightweight cellular concrete panel. The anchor rod is inserted into the through hole of the pipe so as to be perpendicular to the panel surface, and the bolt that penetrates the hole of the base steel material for handrail attachment is screwed into the female thread part. A base steel material fixing structure for attaching a handrail in which the steel material is fixed to the upper edge surface of the lightweight cellular concrete panel was adopted.
In order to solve the above problems, the fixing structure of the present invention is a flat steel in which the base steel material has a hole, and the bolt has a head having a diameter larger than the screw diameter and larger than the hole diameter of the base steel material. The base steel material for attaching a handrail is screwed to the female thread portion of the anchor pipe so that the bolt penetrates the hole of the base steel material and the head of the bolt presses the base steel material.

The fixing structure of the present invention is a flat steel in which the base steel material is cut to a length corresponding to a predetermined pitch, the bolt has a head having a diameter larger than the screw diameter, and the base steel material has a predetermined pitch. Multiple bolts are laid out at intervals, a washer is placed on the upper surface of the end gap of adjacent base steel materials, and the bolts are anchored so that the heads of bolts that penetrate the holes in the washers press the base steel materials through the washers. It is good also as a fixed structure of the handrail attachment base steel material screwed by the internal thread member of a pipe.
Alternatively, the base steel material is a flat steel cut to a length corresponding to a predetermined pitch matched to the anchor pipe, and the bolt head has a flat plate portion perpendicular to the screw shaft, and the central portion of the flat plate portion Has a concave portion corresponding to the attachment for screwing, and a bolt is attached to a female screw member of an anchor pipe that is opened in a gap between adjacent ends of a plurality of base steel materials laid at a predetermined pitch and spaced apart from each other. It is good also as a fixed structure of the handrail mounting base steel material screwed by the internal thread member so that the flat plate part of a bolt may press down the base steel material.

  Further, in the fixing structure of the base steel material according to the present invention, the base steel material is a flat steel, and the bolt has a flat plate portion perpendicular to the screw shaft at the head of the bolt, and a screw for screwing at the center of the flat plate portion. It has a concave part corresponding to the attachment of the tool, the flat plate part of the bolt is pressed against the upper edge of the lightweight cellular concrete panel and fixed, the bolt is screwed to the female screw member of the anchor pipe, and the bolt flat plate It is good also as a fixed structure of the base steel material for handrail attachment by which the base steel material is laid on the upper surface of the part, and is fixed by welding.

  In the present invention, at least a part of the surface of the anchor pipe and the anchor rod may be covered with a rubber material.

  According to the present invention, the bolt for fastening the base steel material for attaching the handrail is not in direct contact with the ALC panel, and the stress of the bolt is dispersed by the anchor pipe and transmitted to the ALC panel. A handrail with sufficient strength can be easily and securely attached to the upper facet. Moreover, it can be attached only by dry-type work, and the field can be cleaned up. Furthermore, it is not necessary to wait for the mortar to harden and install a handrail by attaching it dry, which can lead to an increase in construction speed, and the construction cost can be suppressed as a whole.

(First embodiment)
FIG. 1 is an external perspective view showing an example of a state in which a handrail is attached to a rising ALC wall according to the present invention.
In the handrail attachment structure shown in FIG. 1, a base steel material 9 for handrail attachment is placed on the upper edge surface 1 d of the ALC panel 1, and the anchor pipe 2 embedded in the ALC panel 1 with bolts 3 is threaded. It is fixed by screwing. The handrail support member 24 is welded and fixed to the base steel material 9 for attaching the handrail, and the handrail 26 is attached to the upper edge surface 1d of the ALC panel 1.

FIG. 2 is a perspective view for explaining a construction method of the handrail base mounting structure according to the first embodiment of the present invention.
On the top edge surface 1d of the ALC panel 1, a threaded portion 2b provided on the upper end 2a of the anchor pipe 2 embedded in the ALC panel 1 is exposed.
Here, the anchor pipe 2 has an outer shape that is 1/8 to 1/4 of the thickness of the ALC panel 1, is made of a steel pipe having a length of about 25 to 35 cm, and is threaded inside the upper end 2a. And a threaded portion 2b for fixing a base steel material 9 for handrail attachment later with a bolt is provided, and a through hole 2c for inserting an anchor rod 4 for preventing pulling out is provided below the anchor pipe 2. Is perforated. FIG. 3 shows the structure of the anchor pipe 2, (a) is a side view, and (b) is a front view.

One method for embedding the anchor pipe 2 in the ALC panel 1 is to mold the anchor pipe 2 in which the anchor rod 4 is inserted into the through-hole 2c in advance when light-weight cellular concrete is injected into the mold and cured. There is a method to set it in the frame.
As another method, after hardening the lightweight cellular concrete to obtain the ALC panel, the anchor pipe 2 and the anchor rod 4 are inserted into a predetermined position on the upper edge surface 1d and the surface 1a of the ALC panel 1 using a drill. It is also possible to use a method in which a hole is drilled and then the anchor pipe 2 is inserted from the upper edge surface 1d of the ALC panel 1 and the anchor rod 4 is further inserted from the surface 1a of the ALC panel 1 into the through hole 2c.

Next, the base steel material 9 for handrail attachment which consists of a strip steel plate is mounted in the center part of the thickness direction of the upper edge surface 1d of each ALC panel 1 so that it may become parallel to the ALC panel surface 1a. In the base steel material 9 for attaching the handrail, holes 9a for inserting bolts are provided in advance in accordance with the embedding pitch of the anchor pipe 2. The width of the base steel material 9 for attaching the handrail is preferably slightly narrower than the width of the ALC panel 1. Further, the length of the base steel material 9 for attaching the handrail may be the same as the length of one ALC panel 1, but in terms of strength, it is preferable to have a length corresponding to several ALC panels. More preferred.
After placing the base steel material 9 for attaching the handrail on the upper edge surface 1d of the ALC panel 1, the bolt 3 is passed through the hole 9a of the base steel material 9 for attaching the handrail and screwed into the threaded portion 2b of the anchor pipe 2. The base steel material 9 for attaching the handrail is fixed to the upper edge surface 1 d of the ALC panel 1.

After fixing the base steel material for attaching the handrail to the upper edge of the ALC panel 1, as shown in the conventional method, a handrail support member (not shown) is fixed to the base steel material for attaching the handrail by welding, and the rising wall made of the ALC panel What is necessary is just to attach a handrail to.
At this time, it is preferable from the viewpoint of strength and construction work to attach a handrail support member bracket for fixing the handrail support member to the base steel material 9 for handrail attachment in advance. As the handrail support member bracket, when the handrail support member has a pipe shape, a protrusion that is thinner than the inner diameter of the pipe can be used, and when the handrail support member has a rod shape, a pipe having an inner diameter larger than the outer diameter of the rod can be used.

FIG. 4 is a cross-sectional view of the base steel material fixing structure in the first embodiment.
The upper end 2a of the anchor pipe is preferably located at least 10 mm inside the upper edge surface 1d of the ALC panel 1. This is because if the upper end corner of the anchor pipe 2 is in contact with the end of the ALC panel 1, the anchor pipe 2 is easily chipped when a load is applied in the horizontal direction.
Further, by tightening the bolt 3, the anchor bar 4 comes into close contact with the upper edge surface 1d of the ALC panel, and the fixing strength is increased.

(Second Embodiment)
FIG. 5 is a perspective view for explaining a construction method of the handrail base mounting structure according to the second embodiment of the present invention. Also in this embodiment, the same anchor pipe 2 as used in the first embodiment is used, and it is embedded in the ALC panel 1 in the same manner as in the first embodiment.
That is, the base steel material 12 for handrail attachment which consists of a strip steel plate is mounted in the center part of the thickness direction of the upper edge surface 1d of the ALC panel 1 so that it may become parallel to the ALC panel surface 1a. The base steel material 12 for attaching the handrail is placed so that a gap is formed at a position where the upper end of the anchor pipe 2 embedded in the ALC panel 1 is exposed, and a plurality of pieces are placed over the entire length of the upper edge surface 1d of the ALC panel 1. Put.
Next, the plate 13 having the long holes 13a for inserting bolts is placed so as to straddle the adjacent both ends 12a and 12b of the base steel material 12 for attaching the handrail. The plate 13 is welded and fixed to the surface of the base steel material 12 for handrail attachment.

An anchor pipe 2 is inserted and embedded in the ALC panel 1 from the upper fore edge surface 1 d, and a threaded portion 2 b threaded on the inner surface of the upper end 2 a of the anchor pipe 2 is formed in the upper end edge surface 1 d of the ALC panel 1. Exposed. The bolt 3 is passed through the long hole 13 a of the plate 13 and screwed into the threaded portion 2 b and tightened to fix the base steel material 12 for handrail attachment to the upper edge surface 1 d of the ALC panel 1.
After the base steel material 12 for handrail attachment is fixed to the upper edge surface 1d of the ALC panel 1, the handrail support member 24 is welded and fixed to the base steel material 12 for handrail attachment, as in the first embodiment. Stand up and attach a handrail to the ALC wall.

(Third embodiment)
FIG. 6 is a perspective view for explaining the construction method of the handrail foundation mounting structure according to the third embodiment of the present invention. Also in this embodiment, the same anchor pipe 2 as used in the first embodiment is used, and it is embedded in the ALC panel 1 and used in the same manner as in the first embodiment.
That is, the base steel material 12 for handrail attachment which consists of a strip steel plate is mounted in the center part of the thickness direction of the upper edge surface 1d of the ALC panel 1 so that it may become parallel to the ALC panel surface 1a. The base steel material 12 for attaching the handrail is placed so that a gap 12a is formed at the position where the upper end of the anchor pipe 2 embedded in the ALC panel 1 is exposed, and a plurality of steel sheets 12 are provided over the entire length of the upper edge surface 1d of the ALC panel 1. Place.
An anchor pipe 2 is inserted and embedded in the ALC panel 1 from the upper fore edge surface 1 d, and a threaded portion 2 b threaded on the inner surface of the upper end 2 a of the anchor pipe 2 is formed in the upper end edge surface 1 d of the ALC panel 1. Exposed.
Bolts 38 are inserted into the threaded portions 2b of the anchor pipe 2 through the gaps 12a of the base steel material 12 and screwed together. The head of the bolt 38 forms a flat plate portion 38a perpendicular to the bolt axis, and a concave portion 38b that matches the attachment of the screwing tool is machined at the center of the flat plate portion 38a. Workability is better when tightened with an electric tool or wrench. After the base steel material 12 is fastened and fixed with the bolts 38, the portion where the flat plate portion 38a contacts the base steel material 12 is fixed by welding.

(Fourth embodiment)
FIG. 7: is a perspective view explaining the construction method of the handrail base | substrate attachment structure which concerns on the 4th Embodiment of this invention, (a) is a figure explaining a construction procedure, (b) shows the state after construction. FIG. Also in this embodiment, the same anchor pipe 2 as used in the first embodiment is used, and it is embedded in the ALC panel 1 and used in the same manner as in the first embodiment.
An anchor pipe 2 is inserted and embedded in the ALC panel 1 from the upper fore edge surface 1d, and a threaded portion 2b threaded on the inner surface of the upper end 2a of the anchor pipe 2 is exposed to the upper fore edge surface 1d of the ALC panel 1. is doing.
A bolt 38 similar to that used in the third embodiment is screwed into the threaded portion 2b of the anchor pipe 2 and is tightened by using a power tool such as a drill or a wrench as in the third embodiment. Thereafter, the base steel material 12 is placed on the upper surface of the flat plate portion 38a of the bolt 38 head, and the portion where the flat plate portion 38a and the base steel material 12 are in contact is fixed by welding. In the figure, numeral 39 indicates a weld bead.

(Fifth embodiment)
FIG. 8 shows the structure of the fifth embodiment of the anchor pipe and anchor rod used in the present invention, wherein (a) shows the anchor pipe and (b) shows the anchor rod. The anchor pipe and the anchor bar according to the fifth embodiment are covered with a rubber material.
The anchor pipe 201 shown in FIG. 8A is covered with a rubber material 202 having a thickness of about 1.2 mm from the upper end to about half the length. The anchor rod 204 in FIG. 8B is covered with a rubber material 202 over its entire length. The through hole 201c of the anchor pipe 201 needs to have a large diameter in consideration of the thickness of the rubber material.
By using the anchor pipe and anchor bar covered in this way, it is possible to relieve the intensive stress generated in the part of the panel in contact with the hardware.

It is an external appearance perspective view which shows the state which attached the handrail to the ALC panel by this invention. It is a perspective view explaining the handrail attachment structure concerning a 1st embodiment of the present invention. It is a figure explaining the structure of the anchor pipe used for this invention, Comprising: (a) is a front view, (b) shows a side view. It is sectional drawing explaining the fixing structure of the base steel material for handrail attachment which concerns on 1st Embodiment of this invention. It is a perspective view explaining the fixation structure of the base steel material for handrail attachment which concerns on the 2nd Embodiment of this invention. It is a perspective view explaining the fixation structure of the base steel material for handrail attachment which concerns on the 3rd Embodiment of this invention. It is a perspective view explaining the fixation structure of the base steel material for sliding attachment which concerns on the 4th Embodiment of this invention. It is a figure which shows the structure of 5th Embodiment of the anchor pipe and anchor rod used by this invention, Comprising: (a) is an external appearance perspective view of an anchor pipe, (b) is an external appearance perspective view of an anchor rod. It is a perspective view explaining an example of the attachment structure of the conventional standing wall. It is a figure explaining an example of the conventional handrail attachment structure. It is a figure explaining the other example of the conventional handrail attachment structure. It is a figure which shows an example of the conventional embedding member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lightweight aerated concrete (ALC) panel 1a ALC panel surface 1c Side edge face 1d Upper edge face 1e Lower edge face 2, 201 Anchor pipe 2a Upper end 2b Threaded part 2c, 201c Through-hole 3, 6, 36, 38 Bolt 38a Flat part 38b Concave part 4, 20 Anchor rod 5, 34 Mounting bracket 7 Building housing 8 L-shaped angle 9, 12 Base steel 9a Hole part 13a, Long hole 10 Receiving angle 13 Plate 17 Concave line 18 Joint part 19 For handrail attachment Member 20 Anchor member 21 Adhesive member 22 Washer 23 Nut 24 Handrail support member 25 Kasagi 26 Handrail 29 Hole 31, 32 Anchor 33 Underlying steel material 39 Welding beat 202 Rubber material

Claims (6)

  A base steel material for attaching handrails is fixed to the top edge of the rising wall constructed of lightweight cellular concrete panels, and an anchor pipe with an internal thread at one end and a through hole at the other end The light-weight cellular concrete panel is embedded in the lightweight cellular concrete with the female thread on the top and the through-hole on the bottom so that the female thread is exposed on the upper edge of the lightweight cellular concrete panel. The bolt which penetrated the hole part of the base steel material for handrail attachment to the female screw part is screwed, and by tightening the bolt, the base steel material is fixed to the top edge of the lightweight cellular concrete panel. A base steel material fixing structure for attaching a handrail, characterized in that:   The base steel material is a flat steel having a hole, the bolt has a head having a diameter larger than the screw diameter and larger than the hole diameter of the base steel material, and the bolt penetrates through the hole of the base steel material. The base steel material fixing structure for handrail attachment according to claim 1, wherein the head portion is screwed into a female thread portion of an anchor pipe so as to press the base steel material.   The base steel material is a flat steel cut to a length corresponding to a predetermined pitch, the bolt has a head having a diameter larger than the screw diameter, and a plurality of base steel materials are laid at intervals with a predetermined pitch, The washer is placed on the upper surface of the end gap between adjacent base steel materials, and the bolt is screwed into the female screw member of the anchor pipe so that the head of the bolt that penetrates the hole of the washer presses the base steel material through the washer. The base steel material fixing structure for handrail attachment according to claim 1, wherein the structure is fixed.   The base steel material is a flat steel cut to a length corresponding to a predetermined pitch matched to the anchor pipe, the bolt head has a flat plate portion perpendicular to the screw shaft, It has a concave part corresponding to the attachment for screwing, and a bolt is screwed into the female thread member of the anchor pipe that is opened in the gap between the adjacent ends of a plurality of base steel materials laid at intervals with a predetermined pitch. The base steel material fixing structure for handrail attachment according to claim 1, wherein the flat plate portion of the bolt is screwed into the female screw member so as to press down the base steel material.   The base steel material is flat steel, the bolt head has a flat plate portion perpendicular to the screw shaft, and the flat plate portion has a concave portion corresponding to the attachment of the screwing tool. The flat plate part of the bolt is pressed and fixed to the upper edge of the lightweight cellular concrete panel, the bolt is screwed into the female thread member of the anchor pipe, and the base steel material is laid on the upper surface of the bolt flat plate part and fixed by welding. The base steel material fixing structure for attaching a handrail according to claim 1, wherein:   The base steel material fixing structure for handrail attachment according to claim 1, wherein at least a part of the surface of the anchor pipe and the anchor bar is covered with a rubber material.