JPH0949337A - Fall preventive handrail - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fall from an opening part for a stair part by arranging a pressing body to be sandwiched and installed between a flange and a fitting notch lower edge part in an upper surface wall lower part so as to be vertically freely movable, and installing a horizontal lever between a column main body whose lower end part is inserted and arranged in an inserting arranging cylinder. SOLUTION: At a building site where a frame is composed of a column of H shape steel and a beam C, an installing part 5 to a beam part C is composed of an inserting arranging cylinder 7 of a column main body 4, an upper surface wall 10 integrally formed in an inserting arranging cylinder 7 side part and a pair of side surface walls 11a. In this case, a fitting notch 14a to a flange F of the beam part C is arranged on the side surface walls 11a, and a pressing body to sandwich and install the flange F with a lower edge part of the fitting notch 14a is arranged in a lower part the upper surface wall 10 so as to be vertically freely movable. It is arranged and fixed in large numbers in a prescribed position of the beam part C, and a lower end part of the column main body 4 is inserted and arranged in the inserting arranging cylinder 7, and a column 2 is installed on the periphery of an opening part, and a horizontal lever is installed between the column main body 4 so as to be freely extensible and contractible. Therefore, a falling preventive handrail can be temporarily constructed in a peripheral part of an opening part for stairs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention handrail that is temporarily installed around an opening formed in a floor of a multi-story building made of steel.

[0002]

2. Description of the Related Art Conventionally, at a construction site of a steel-framed multi-storied building, a floor plate such as a deck plate is laid across the beams so that the stairs are connected to each other. Since it is constructed in a later process, the floor plate is not laid on the corresponding part and it is left in an open state, so a fall accident from such an opening is likely to occur, which is very dangerous.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a fall prevention handrail which can be easily attached and fixed to a beam portion arranged around a stairway opening portion.

[0004]

SUMMARY OF THE INVENTION The present invention is based on the above-mentioned prior art, and in view of the very dangerous problem that there is an opening for stairs in the floor at the construction site, it is considered that the H-shaped steel columns and beams are used. In a construction site where a frame is constructed, a mounting portion to a beam portion is constituted by an insertion cylinder of a pillar main body, and an upper surface wall and a pair of side walls integrally formed on the side portion of the insertion cylinder. Is formed in the side wall, and a pressing body for sandwiching the flange with the lower edge of the fitting cut is vertically movably arranged in the lower part of the top wall, and the mounting portion is provided with an opening for stairs. A large number of columns are mounted and fixed at predetermined positions, the lower end of the column body is inserted into the insertion tube, and a large number of columns are erected around the opening and can be expanded and contracted between the column bodies. By installing a horizontal rail, a handrail is temporarily installed around the opening for the stairs. Problems are those that were resolved cents.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a stairway portion for connecting each layer in a construction site of a steel-framed multi-story building in which a frame is composed of columns and beams of H-shaped steel. The fall prevention handrail 1 is provided around the opening B formed on the floor of each layer for installing A. The fall prevention handrail 1 has a corner portion of the opening B (when the interval is long, The columns 2, 2a ... Standing upright at appropriate intermediate positions, and the horizontal rods 3, 3a ... Stretchable between the columns 2, 2a ... And the columns 2, 2a. It is composed of a pipe-shaped strut body 4 and a mounting portion 5 which is detachably mounted on the lower end portion of the strut body 4 and is mounted and fixed to a beam portion C forming an opening B.

Further, the mounting portion 5 includes an insertion tube 7 of the column main body 4,
It is formed by integrally molding the mounting portion main body 8 to the beam portion C, and the insertion tube 7
A stopper screw 9, which is a butterfly screw, is screwed into the upper part of the shaft from the outside, and the tip of the stopper screw 9 is inserted into the insertion tube 7.
It projects from the inner peripheral surface.

The mounting portion main body 8 of the mounting portion 5 is composed of an upper surface wall 10 and a pair of side wall surfaces 11 and 11a. An adjusting bolt 12 is vertically inserted into the upper surface wall 10 and a lower end portion of the adjusting bolt 12 is also inserted. The pressing body 13 is mounted on the side walls, and the side walls 11 and 11a are horizontally formed with fitting notches 14 and 14a which open at the front end face portions.

The pressing body 13 has a base portion 15 whose outer surface is a circumferential surface.
A flange 15a is formed at the lower end, and triangular ribs 16, 16a are provided on the outer peripheral surface of the base 15 at predetermined intervals.

Further, circular depressions 17 and 18 are formed in the centers of the upper and lower surfaces of the pressing body 13, and a spring insertion hole 19 is formed in the center of the pressing body 13 and positions corresponding to both sides of the spring insertion hole 19 are formed. Guide holes 20 and 20a are formed longitudinally in the guide holes 20 and 20a, respectively, and the guide holes 20 and 20a are stepped holes having locking step portions 21 and 21a at their lower portions.

Further, the lower end of the adjusting bolt 12 is inserted into the circular recess 17 on the upper surface side of the pressing body 13, and the tip ends of the fixing screws 22 and 22a horizontally screwed into the upper outer surface of the pressing body 13 from the outside. ,
The pressing bolt 13 is fitted and fixed to the lower end portion of the adjusting bolt 12 by being fitted into a fitting groove 23 provided around the lower end side outer peripheral portion of the adjusting bolt 12.

Mounting screws 24, 24a are provided in the guide holes 20, 20a.
Is vertically movably inserted, and the lower ends of the mounting screws 24, 24a are
The fitting body 25 is screwed into the upper surface of the fitting body 25 housed in the circular recess 18 on the lower surface side of the pressing body 13 so that the fitting body 25 can be retracted from the lower surface of the pressing body 13 and the locking step of the guide holes 20, 20a. Part 21, 21a
The screw heads 26, 26a of the mounting screws 24, 24a abut on the fitting body.
I try not to drop 25.

A compression spring 27 is housed in the spring insertion hole 19 of the pressing body 13, and the upper end of the compression spring 27 is the lower end of the adjusting bolt 12 inserted in the circular recess 17 on the upper surface side of the pressing body 13. And the lower end is fitted into a spring counterbore 28 recessed in the center of the upper surface of the fitting body 25, and the compression spring 27 causes the fitting body 25 to
Is pushing downwards.

Further, when the pressing body 13 is at the uppermost position, the lower surface of the fitting body 25 is located at substantially the same position as the upper edges of the fitting notches 14 and 14a or at the upper position.

Further, insert plates 3 projecting downward are provided at both ends of the extendable and retractable horizontal rods 3, 3a.
0 and 30a are fixed, and the lower end portions of the insertion plates 30 and 30a are bent inward to form retaining pieces 34 and 34a, while the horizontal rods 3 are provided on the upper end portion and the middle portion of the column main body 4. , 3a ... Inserting plates 29, 29a for inserting the inserting plates 30, 30a are provided, and each of the attaching parts 29, 29a is provided on three sides of the column body 4 with the inserting plates 30 for the horizontal rods 3, 3a. , 30a are formed in the vertical direction so that the insertion parts 32, 32a.

Numeral 33 is a ring-shaped stopper provided at the lower portion of the pillar main body 4, and the stopper 33 is brought into contact with the upper end of the insertion cylinder 7 when the pillar main body 4 is inserted into the insertion cylinder 7. The vertical position of the pillar body 4 is regulated, and the stopper screw 9
The support body 4 is fixed by screwing in and making the tip of the stopper screw 9 abut.

Next, the operation of the fall prevention handrail according to the present invention will be described. First, as shown in FIG. 2, in the mounting portion 5, the lower surface of the fitting body 25 is at least the same as the upper edge portions of the fitting notches 14 and 14a. Adjust the adjusting bolt 12 so that it is in the position.

A fitting notch formed in the side wall 11 or 11a of the mounting portion main body 8 in the mounting portion 5 is formed at the edge portion of the upper flange F of the beam portion C forming the opening portion B on the side of the opening portion B.
When 14 and 14a are fitted, and then the adjusting bolt 12 protruding above the upper surface wall 10 is rotated in the screw-in direction by a wrench or the like to move the adjusting bolt 12 downward, first, the lower surface of the fitting body 25 becomes the flange F.
Abutting on the upper surface, the locking step portion 21 in the guide holes 20, 20a,
The screw heads 26, 26a of the mounting screws 24, 24a that were in a locked state with respect to 21a are disengaged, and the mounting screws 24, 24a are moved upward with respect to the guide holes 20, 20a, that is, the fitting body 25 is stopped. The compression spring 27 is compressed as it is, and only the pressing body 13 moves downward and gradually retracts into the circular recess 18.

Next, the adjusting bolt 12 is moved downward until the fitting body 25 is completely retracted so that the lower surface of the pressing body 13 contacts the upper surface of the flange F and the lower surface of the flange F contacts the lower edges of the fitting notches 14 and 14a. Then, the flange F is sandwiched between the lower surface of the pressing body 13 and the lower edges of the fitting notches 14 and 14a, and a predetermined position of the beam C such as a corner of the opening B (added between the corners when the distance is long). A large number of mounting parts 5 are attached and fixed to.

Further, in the case of the beam portion C having the bolt hole H in the upper flange F, the pressing body 13 is moved downward so that the fitting body 25 is fitted in the bolt hole H, and the mounting portion 5 is beamed. Attach and fix to part C.

Next, the support body 4 is inserted into the insertion tube 7 of the mounting portion 5.
The lower end portion of the column is inserted, and the stopper screw 9 is screwed into the column body to fix the column body 4 so that the column body 4 is erected, and the insertion plates 30, 30a at both ends of the horizontal rods 3, 3a.
Of the columns 2, 2a, ...
After being inserted into the insertion portions 32, 32a of the 9, 29a, the horizontal rods 3, 3a are contracted, and the insertion plates 30, 30a are pressed against the inner surfaces of the mounting portions 29, 29a. Are fixed to the columns 2, 2a, and the horizontal rods 3, 3a are installed between the adjacent columns 2, 2a, and the three sides except the side of the stairs A around the opening B (the stairs A If there is a wall side of the room, the fall prevention handrail 1 is temporarily installed on two sides).

Further, even if an impact is applied to the horizontal rods 3, 3a, ..., the insertion plates 30, 30a are attached to the mounting portion 29, by the retaining pieces 34, 34a.
It does not come out of 29a, and the side rods 3, 3a ... do not fall off.

When the fall prevention handrail 1 is to be removed, the steps opposite to the above are carried out to first remove the horizontal rods 3, 3a ... From the columns 2, 2a. Is removed, and the mounting portion 5 is removed from the beam portion C to remove it.

The bolt hole H of the beam portion C is not newly provided in order to install the fall prevention handrail 1 of the present invention, but is already formed at the manufacturing stage of the steel material to be the beam portion C. It is used for the purpose of connecting members when constructing a building, and the bolt holes H are used to prevent the falling handrail 1
It is applied and used for mounting the mounting portion 5 of the.

[0024]

In summary, according to the present invention, in an opening for stairs formed in the floor of each layer of a building site of a multi-layer building having a frame made of H-shaped steel, the opening is arranged around the opening A. A large number of stanchions 2, 2a in which a stanchion body 4 is removably inserted in the mounting part 5 to the beam part C, and the lateral rods 3 and 3a are expandable between
Since the pillars 2 and 2a and the horizontal rods 3 and 3a are provided, the rail-shaped fall prevention handrail 1 can be formed.
Is attached to three sides of the opening B (two sides when the stair A is on the wall side of the room), a fall accident from the opening B can be prevented, and the horizontal rods 3, 3a ... By making it free, it is possible to cope with the difference in the distance between the columns 2, 2a ... Due to the difference in the size of the opening B.

The mounting portion 5 has a top wall 10 and a pair of side walls 11 and 11a integrally formed on the side of the insertion tube 7 of the column main body 4, and a pressing body 13 is arranged below the top wall 10 so as to be vertically movable. Along with setting
Mating notches 14 and 14a that open at the front end of the side walls 11 and 11a
Since the mounting portion 5 is formed with the lower surface of the pressing body 13 and the fitting notch 1
4, 14a Since the upper flange F of the beam portion C is sandwiched and fixedly attached to the beam portion C at the lower edge portion, if the thickness of the flange F of the beam portion C is smaller than the width of the fitting notches 14 and 14a. ,
The mounting portion 5 can be attached and fixed to the beam portion C regardless of the wall thickness.

Further, since the pressing body 13 is attached to the lower end of the adjusting bolt 12 which is vertically inserted into the upper surface wall 10, the pressing body 13 is moved up and down simply by turning the bolt head of the adjusting bolt 12 protruding from the upper surface of the upper surface wall 10. Therefore, the work of attaching and fixing the mounting portion 5 to the beam portion C can be facilitated.

Further, since the fitting body 25 for the bolt hole H formed in the upper flange F of the beam portion C is provided so as to be retractable from the lower surface of the pressing body 13, the beam portion C forming the opening portion A If the flange F has bolt holes H used for joining, etc.,
The mounting portion 5 can be mounted by fitting the fitting body 25 into the bolt hole H, so that the lateral displacement of the columns 2, 2a ... Can be prevented, and the flange F does not have the bolt hole H. However, since the upper surface of the flange F can be reliably pressed by the lower surface of the pressing body 13 by immersing in the pressing body 13, the bolt hole H
It can be used for both beam portions C regardless of the presence or absence of the above, and its practical effect is extremely great.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a fall prevention handrail according to the present invention is attached to a beam portion.

FIG. 2 is a front view of a mounting portion.

FIG. 3 is a longitudinal sectional view of an essential part showing a mounting state of the mounting portion to the beam portion.

FIG. 4 is a longitudinal cross-sectional view of a main part showing a mounting state on a beam portion having a bolt hole in a flange of the mounting portion.

FIG. 5 is a plan view showing an installed state of a fall prevention handrail.

6 is a sectional view taken along line YY of FIG.

FIG. 7 is a sectional view taken along line ZZ in FIG.

FIG. 8 is a plan view of an essential part showing a mounted state of a horizontal rod.

9 is a front view of FIG. 8. FIG.

[Explanation of symbols]

 2, 2a ... Struts 3, 3a ... Horizontal rod 4 Strut body 5 Mounting part 7 Insertion cylinder 10 Top wall 11, 11a Side wall 12 Adjusting bolt 13 Pressing body 14, 14a Fitting notch 25 Fitting body A Opening C Beam portion F flange

Claims (3)

[Claims] 1. An opening for a stairway formed in a floor of each layer of a multi-story building having a frame made of H-shaped steel, and a strut attached to a beam portion arranged around the opening. An expandable and contractible horizontal rod is installed between a large number of pillars in which the main body is detachably inserted, and the mounting portion is integrally formed with a top wall and a pair of side walls on the side of the pillar body where the pillar is inserted. A fall prevention handrail, characterized in that a pressing body is arranged in the lower part so as to be movable up and down, and a fitting notch opening at a front end face portion of a side wall is formed. 2. The fall prevention handrail according to claim 1, wherein the pressing body is attached to the lower end of the adjusting bolt which is vertically inserted into the upper surface wall. 3. The fall prevention handrail according to claim 1 or 2, wherein a fitting body into a bolt hole formed in a flange above the beam portion is provided so as to be retractable from the lower surface of the pressing body.