JP3024935B2 - Method of extending work safety net in steel structure and net mounting rod used in this method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work for constructing a steel structure, in which a work safety net is stretched in a space surrounded by front, rear, left and right beams at a required height when a frame is completed. The present invention relates to a method and a net mounting rod used in the method.

[0002]

2. Description of the Related Art As described above, when a work safety net is stretched in a space surrounded by front, rear, left and right beams in a steel structure, conventionally, as shown in FIG.
A bar member R extending parallel to the beam member 1 is provided between the vertical frame portions 7 of the substantially upward U-shaped scaffolding board bridging frame 4 suspended on the front, rear, left and right beam members 1 at predetermined intervals in the longitudinal direction. The bar R is connected to the inside and outside of the frame 4 and the end of the safety net 3 is separated from the outside bar R of the frame 4 by the scaffold. The safety net 3 is stretched in the space by passing the lower side of the board suspension frame and tying it over the inner rod material R.

[0003]

In the conventional method as described above, it takes a great deal of time and effort to tie a required portion of the net to a bar connected between the vertical frames of the scaffolding frame. , Had difficulty in the work of stretching the safety net. Furthermore, according to the conventional method, when a heavy object or a worker accidentally falls on the safety net 3, the connecting portion (encircled by an arrow F) between the horizontal frame portion 6 and the inner vertical frame portion 7 of each scaffolding board bridging frame 4 is enclosed. 11), the falling load of the heavy object or the like acts intensively, and the connecting portion is broken, whereby the inner vertical frame 7 falls down as shown by the phantom line in FIG. There was the problem of causing a major accident.

[0004] It is an object of the present invention to provide a method for easily and quickly mounting a safety net, and a net mounting rod used for the method.

[0005]

The invention according to claim 1 is
A method of stretching a work safety net 3 in a space 2 surrounded by front, rear, left and right beams 1a to 1d in a steel structure K, and suspending the beams at predetermined intervals in the longitudinal direction of the beams 1a to 1d. Utilizing a substantially upward U-shaped scaffolding board bridging frame 4, the scaffolding board bridging frame 4 is provided between the horizontal frame portions 6, 6.
A net mounting rod 1 extending in parallel with each of the beam members 1a to 1d and provided with a net hook 13 at required intervals in the longitudinal direction.
2 and a net hook 1 for the net mounting rod 12
3 hangs a required portion of the work safety net 3
It is characterized by being stretched.

According to a second aspect of the present invention, there is provided a net mounting rod 12 for a work safety net tensioner,
A mounting rod main body 15, a plurality of net hooks 13 provided at required intervals in the longitudinal direction of the mounting rod main body 15,
Consists removable hook 16, 16 Metropolitan provided on both ends in the mounting杆本body 15, each net hook bracket 13, upper and lower
Are formed in a pair of linear bodies 1 formed in a substantially W-shape in opposite directions.
3a, 13a, and both linear bodies 13a, 13a
And is attached to the mounting rod body 15 in an integrated state.
Fits slidably in the hand direction and has a square tubular mounting rod
A pair of net ropes on both sides on the left and right sides of the body 15
It is characterized in that the parts 17, 17 are formed .

[0007] The invention according to claim 3, in net mounting rod 12 for working safety net tension, the mounting rod 12
Is a mounting rod main body 15 and a longitudinal position of the mounting rod main body 15.
A plurality of net hooks 18 provided at required intervals;
Removable hooks provided at both ends of the mounting rod body 15
The end ring 1 is fixed to the mounting rod body 15 at a fixed position.
8a, wherein both ends of the ring 18a form a net rope engaging / disengaging portion 19 on the upper surface side of the mounting rod body 15.

[0008] The invention according to claim 4 is the net mounting rod 12 for working safety net tension, the mounting rod 12
Is a mounting rod main body 15 and a longitudinal position of the mounting rod main body 15.
A plurality of net hooks 20 provided at intervals required;
Removable hooks provided at both ends of the mounting rod body 15
Consists Prefecture 16,16, each net latching fitting 20 consists having ends shaped ring 20a that is pivotally mounted to be raised and lowered with respect to the side surface of the mounting杆本body 15 in place of the mounting杆本body 15, the ring It is characterized in that both ends of 20a form a net rope engaging / disengaging portion 21.

[0009] The invention according to claim 5 is the net mounting rod 12 for working safety net tension, the mounting rod 12
Is a mounting rod main body 15 and a longitudinal position of the mounting rod main body 15.
A plurality of net hooks 22 to 2 provided at intervals required
4 and a mounting / dismounting mechanism provided at both ends of the mounting rod body 15.
Hooks 16, 16 and each net hook 22
24 includes a pair of linear bodies 22a, 22a to 24a, 24a each having at least a distal end portion formed in an L-shape, and both linear bodies 22a, 22a to 24a, 24a are located at fixed positions of the mounting rod body 15. It is characterized by being fixed in different directions from each other to form the net rope engaging / disengaging portions 25 to 27.

According to a sixth aspect of the present invention, in the net mounting rod 12 for tensioning the safety net for work according to any one of the second to fifth aspects, the mounting rod main bodies 15 are nested with each other in a telescopic manner. It is characterized by being formed by a plurality of members 15a and 15b.

[0012]

1 and 2 are a cross-sectional view and a vertical cross-sectional view of a required story portion of a middle- or high-rise steel structure K, respectively, and show front, rear, left and right beam members 1a, 1b, 1 of the story portion.
4 shows a state in which a work safety net 3 is stretched over a space 2 surrounded by c and 1d, and FIG. 3 is an enlarged detailed view of FIG.
FIG. In these figures, reference numeral 4 denotes a scaffold plate bridging frame suspended at predetermined intervals in the longitudinal direction of each of the beams 1a to 1d, and three frames are suspended for each of the beams 1a to 1d. Reference numeral 5 denotes a scaffold plate bridged between the scaffold plate bridge frames 4 adjacent to each other in the longitudinal direction of the beam. Each beam 1
a to 1d are made of H-shaped steel.

As shown in FIGS. 3 and 4, each of the scaffold plate bridging frames 4 has a horizontal frame 6 made of steel pipes and steel pipes integrally connected vertically upward to both ends of the horizontal frame 6, respectively. The vertical frame portions 7, 7 are formed in a substantially upward U-shape. A pair of substantially U-shaped support members 8, 8 are integrally formed at the center of the horizontal frame portion 6 in an upward direction. A bracket 9 is fixed to the upper ends of the support members 8, 8, and a pair of U-shaped clamps 10, 10 on both sides are attached to the bracket 9 so as to be movable and adjustable in the direction of the distance between each other. Each clamp 10 has a butterfly-shaped clamp bolt 10a.

The scaffolding frame 4 is connected to the beam members 1a to 1a.
d, a pair of U-shaped clamps 10, 10 whose opposing intervals are appropriately adjusted according to the width of the H-section steel, are fitted to the lower ends of the beams 1a to 1d from both sides as shown in FIG. Then, by tightening the clamp bolts 10a of the U-shaped clamps 10, the U-shaped frame portions of the scaffold plate bridging frames 4 composed of the horizontal frame portions 6 and the vertical frame portions 7, 7 are supported by the support members 8, 8
Can be hung on each of the beam members 1a to 1d. In this manner, a pair of scaffold plates 5, 5 on both sides are placed between the horizontal frame portions 6, 6 of the adjacent scaffold plate bridging frames 4, 4 suspended on the respective beam members 1 a to 1 d at predetermined intervals in the longitudinal direction. Hang over.
In this case, each scaffold plate 5 may have hooks 5 a protruding from both ends thereof engaged with the horizontal frame portion 6 of the scaffold plate bridge frame 4. In addition, as shown in FIG. 1, three scaffolding board bridging frames 4 are hung on each of the beam members 1a to 1d.
The net mounting rod 12 is mounted. As can be clearly understood from FIG. 4, the vertical frame portions 7 of the scaffolding plate bridging frame 4 which are opposed to each other in the longitudinal direction of the beam are connected to each other via a pipe clamp 12 by a handrail frame 11 made of steel pipe. I have.

In order to stretch the work safety net 3 in the space 2 surrounded by the front, rear, left and right beams 1a, 1b, 1c, 1d as shown in FIG. As shown in FIG. 4, the net mounting rods 12 are respectively bridged between the horizontal frame portions 6 of the plurality of scaffold plate bridges 4 suspended on the beams 1 a to 1 d. Since each net mounting rod 12 is provided with a plurality of net hooks 13 at required intervals in the longitudinal direction, the net hooks 1 of each net mounting rod 12 are provided.
By hooking the required portion of the safety net 3 to 3,
The safety net 3 can be stretched. As shown in FIGS. 3 and 4, the net mounting rod 12 is provided between the left and right scaffolding plates 5, 5 bridged on the horizontal frame portions 6, 6 of the opposing scaffolding plate bridging frames 4, 4. Hang over.

As shown in FIG. 1, front and rear left and right beam members 1a to 1
When a single safety net 3 of substantially the same size as the space 2 is stretched over the space 2 surrounded by d, the safety net 3 is attached to the net mounting rod 12 on the front beam 1a side. The front edge is hung, the rear edge of the safety net 3 is hung on the net mounting rod 12 on the rear beam 1b side, and the left and right beams 1c, 1d are also hooked.
The left and right side edges of the safety net 3 may be hooked to the side net mounting rod 12, and the four corners of the safety net 3 may be pulled using a string or a rope as shown in FIG. What is necessary is just to fix to the corner part of beam material 1a-1d. In the case where a plurality of spaces 2 as described above are continuously provided in the left-right or front-rear direction in the steel structure K, one safety net 3 may be hung for each space 2. Alternatively, a series of safety nets 3 may be hung over a plurality of the space portions 2 provided in series.

The safety net 3 is usually provided with a net rope 14 along the periphery thereof. Therefore, when attaching the safety net 3 to the net mounting rod 12, the net rope 14 is connected to the net mounting rod 12 by the net. Hook 1
3 When the intermediate required portion of the safety net 3 is attached to the net mounting rod 12, the mesh of the net 3 may be directly hooked on the net hook 13, but preferably the net rope 14 is inserted through the intermediate required portion. Preferably, the net rope 14 is hooked on the net hook 13.

As described above, when the work safety net 3 is stretched in the space 2 surrounded by the front, rear, left and right beams 1a to 1d in the steel structure K, the beams 1a to 1d extend in the longitudinal direction. Utilizing a substantially upward U-shaped scaffolding board bridging frame 4 hung at predetermined intervals, each of the beam members 1a to 1d is placed between the opposed horizontal frame parts 6, 6 of the scaffolding board bridging frame 4. It is only necessary to bridge a net mounting rod 12 extending in parallel with the above and to hook the net ropes 14 of the working safety net 3 on the plurality of net mounting rods 12 provided on the net mounting rod 12. The bridge work can be performed easily and quickly.

According to the above-described method of stretching the safety net 3, as shown in FIG. 3, the net mounting rod 12 is supported at the center of the horizontal frame 6 in each scaffolding board bridging frame 4. In order to attach the safety net 3 to the net mounting rod 12, if a heavy object or a worker accidentally falls on the safety net 3, the falling load is applied to the horizontal frame 6
Therefore, there is no possibility that the connecting portion between the horizontal frame portion 6 and the vertical frame portion 7 is broken as in the conventional example shown in FIG.

As shown in FIG. 5, the net mounting rod 12 includes a mounting rod main body 15 formed in a rectangular tubular shape, and a plurality of nets movably provided along the longitudinal direction of the mounting rod main body 15. It comprises a hook 13 and detachable hooks 16 provided on both ends of the mounting rod body 15. As can be seen from the enlarged views of FIGS. 6 and 7, each net hook 13 includes a pair of linear bodies 13 a, 13 a formed in a substantially W-shape with upper and lower sides being opposite to each other. 13a, 13a are fitted to the mounting rod body 15 in the form of a cylinder in a longitudinal direction in a state in which the side portions are fixed to each other by welding, and are slidable in the longitudinal direction, and as shown in FIG. A pair of net rope engagement / disengagement portions 17, 17 are formed on both left and right side surfaces of the attachment rod main body 15.

According to the net hook 13 having the above-described structure, the net rope engaging / disengaging portions 17 are formed on both left and right side surfaces of the mounting rod body 15, respectively.
The required portion of the safety net 3 can be hooked via the net ropes 14 on both sides of the safety net 3 with the pin 5 interposed therebetween. Further, since the mounting rod body 15 is formed in the shape of a rectangular tube, the respective net hooks 13 do not rotate and can maintain a predetermined posture. There is no risk of accidental separation. In addition, since each net hook 13 is movable along the longitudinal direction of the mounting rod body 15, the net hook 13 can be arranged at any position on the mounting rod body 15.

The attachment / detachment hooks 16 provided at both ends of the mounting rod main body 15 are fitted and latched to the horizontal frame portion 6 of the scaffold plate bridging frame 4 with one touch. It has a well-known structure.

The net mounting rod 12 shown in FIG. 5 has a first member 15a whose mounting rod body 15 has a rectangular tubular shape and a first member 15a.
A rectangular cylindrical second member 15b which is telescopically fitted into the member 15a so as to be telescopically attached, and which is attached to the beams 1a to 1d in accordance with the span of the scaffolding board bridging frame 4 or the like. The length of the rod 12 can be adjusted to expand and contract.

FIGS. 8A to 8C show the net mounting rod 12.
1 shows a net hook 18 fixedly provided at a fixed position on the mounting rod main body 15 of FIG.
8 is an end-shaped ring 18 that is externally fitted and fixed to a fixed position of the rectangular tubular mounting rod body 15 as can be seen from FIG.
a of the mounting rod body 1
A net rope engagement / disengagement portion 19 is formed on the upper surface side of 5.
According to the net hooking member 18, since the net rope engaging / disengaging portion 19 is formed upward on the upper surface side of the mounting rod main body 15, if the net rope 14 is hooked and the safety net 3 is once suspended, The net rope 14 does not easily come off the net rope engaging / disengaging portion 19.

FIGS. 9A to 9D show the net mounting rod 12.
2 shows a net hook 20 fixedly provided at a fixed position on the mounting rod body 15 of FIG.
Reference numeral 0 denotes an end-shaped ring 20a pivotally attached to the upper surface of the mounting rod body 15 at a fixed position by a pivoting member 20b at a fixed position of the mounting rod body 15, and both ends of the ring are net ropes. An engaging / disengaging portion 21 is formed. According to the net hook 20, when the net mounting rod 12 is not used, each net hook 20 is rotated about the pivot member 20 b as shown in FIG. In this case, the protrusions are eliminated and the net mounting rod 12 is conveniently transported and stored.

FIGS. 10A to 10C show various net hooks 22 to 23 fixedly provided at fixed positions on the mounting rod main body 15 of the net mounting rod 12 as in FIG. However, each of the net hooks 22 to 24 has a pair of linear bodies 22a,
22a to 24a and 24a. That is, the net hook 22 of FIG. 10A is composed of a pair of linear bodies 22a, 22a formed entirely in an L-shape.
The two linear members 22a, 22a are fixed on the mounting rod body 15 by welding in mutually different lateral postures to form a net rope engaging / disengaging portion 25 between the distal ends. Each linear body 23a constituting the net hook 23 of FIG.
Is composed of an L-shaped portion 23b and an I-shaped portion 23c, which are entirely formed in a U-shape.
Are opposed to each other in different lateral orientations,
Character part 23c, 23c is welded on the attaching rod main body 15,
A net rope engaging / disengaging portion 26 is formed between the distal ends. Each of the linear bodies 24a constituting the net hook 24 shown in FIG. 4C is formed by forming an L-shaped part 24b and an L-shaped part 24c into a three-dimensional shape. 2
An L-shaped portion 24c on the lower side of 4a is welded on the mounting rod main body 15, and a net rope engaging / disengaging portion 27 is formed between the L-shaped portions 24b on the distal end side. According to such net hooks 22 to 23, since the structure is simple, manufacture becomes easy.

[0027]

According to the stretching method of the first aspect of the present invention, this stretching method comprises a substantially upwardly extending cable suspended from the front, rear, left and right beam members forming the space at predetermined intervals. U-shaped scaffold plate bridging frame is used, and a net mounting rod extending parallel to each beam material is bridged between the horizontal frame portions of the scaffold plate bridging frames facing each other. It is only necessary to hook the net ropes of the work safety net on the plurality of net mounting rods provided in the above, so that the work safety net can be easily and quickly stretched.

Further, according to the present invention, since the net mounting rod is supported by the horizontal frame portion of each scaffold plate bridging frame, and the safety net is mounted on the net mounting rod, heavy objects and workers are placed on the safety net. If the unit falls accidentally, the falling load will be received by the horizontal frame, and there is no danger that the connection between the horizontal frame and the vertical frame will be broken as in the conventional method. Become.

According to the second aspect of the present invention, the net mounting rod used in the first aspect of the present invention includes a mounting rod main body and a plurality of net hooks provided at required intervals in the longitudinal direction of the mounting rod main body. Since it is composed of metal fittings and attaching / detaching hooks provided at both ends of the mounting rod main body, when the net mounting rod is bridged between the opposed horizontal frame portions of the scaffolding plate bridging frame, the net mounting rod is mounted. The hooks for attaching and detaching the both ends of the rod can be easily and easily hooked up by engaging the horizontal frame portion with the net mounting rod. Therefore, it is easy to lock the safety net.

According to the second aspect of the present invention, since each of the net hooks is provided so as to be movable in the longitudinal direction of the mounting rod main body, the net hooks can be arbitrarily mounted on the mounting rod main body. Position.

According to the second aspect of the present invention, since the mounting rod main body is formed in the shape of a rectangular tube, each of the net hooks does not rotate on the mounting rod main body, and always assumes a predetermined posture. Can be maintained. Further, there is no possibility that the net rope is accidentally detached from the net hook.

Further , according to the invention of claim 2 ,
Since the net rope engaging / disengaging portions are formed on both left and right side surfaces of the mounting rod main body, required portions of the safety net can be hooked via the net rope on both sides of the mounting rod main body.

According to the third aspect of the present invention, each of the net hooks comprises an end-shaped ring externally fitted and fixed to a fixed position of the mounting rod main body, and both ends of the ring are attached to the mounting rod main body. Since the net rope engagement / disengagement portion is formed on the upper surface side, the net rope engagement / disengagement portion is formed upward on the upper surface side of the mounting rod main body. In addition, there is no possibility that the net rope is easily detached from the net rope engaging / disengaging portion, and it is extremely safe.

According to the fourth aspect of the present invention, each of the net hooks is formed of an end-shaped ring pivotally attached to the side surface of the mounting rod body at a fixed position of the mounting rod body.
When the net mounting rod is not used, each net latch is rotated around the pivoting member and laid down along the side of the mounting rod main body, so that there are no protrusions. It is convenient for storage.

According to the fifth aspect of the present invention, since the structure of each net hook is simple, it is easy to manufacture a net mounting rod.

According to the sixth aspect of the present invention, since the mounting rod body is formed of a plurality of members which are telescopically joined to each other so as to be nested with each other, the span of the scaffolding plate bridging frame which is mounted on the beam member, etc. , The length of the net mounting rod can be adjusted as desired.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view showing a state in which a work safety net is stretched over a space in a steel structure.

FIG. 2 is a longitudinal sectional side view showing a state in which a work safety net is stretched in the same space.

FIG. 3 is an enlarged detailed vertical sectional side view of FIG. 2;

FIG. 4 is a perspective view of a main part of the above.

5A is a plan view of the net mounting rod, FIG. 5B is a front view of the net mounting rod, and FIG. 5C is a front view of the net mounting rod with the mounting rod body extended.

FIG. 6 is an enlarged front view of a portion indicated by an arrow X in FIG.

FIG. 7 is a sectional view taken along line YY of FIG. 6;

8 (A) is a partial plan view of a net mounting rod according to another example, FIG. 8 (B) is a front view thereof, and FIG. 8 (C) is an enlarged sectional view taken along the line ZZ of FIG. 8 (B).

9A is a partial plan view of a net mounting rod according to still another example, FIG. 9B is a front view thereof, FIG. 9C is a partially enlarged front view of FIG. 9B, and FIG. It is a WW sectional view taken on a line.

FIGS. 10A to 10C are perspective views showing other various net hooks.

FIG. 11 is a longitudinal sectional side view illustrating a conventional net stretching method.

[Explanation of symbols]

 Reference Signs List 1a beam material 1b beam material 1c beam material 1d beam material 2 space 3 work safety net 4 scaffolding board bridging frame 5 scaffolding board 6 horizontal frame of scaffolding board bridging frame 7 vertical frame of scaffolding board bridging frame 8 Support member 9 Bracket 10 Clamp 13 Net hook 14 Net rope 15 Mounting rod body 16 Hook for attachment / detachment 17 Net rope engagement / disengagement section 18 Net hook engagement section 19 Net rope engagement / disengagement section 20 Net hook engagement section 21 Net rope engagement / disengagement section 22 Net latch 23 Net latch 24 Net latch

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsuyoshi Tsujii 3-6-2 Nihonbashi, Chuo-ku, Tokyo Asahi Kiki Co., Ltd. (72) Inventor Tadaharu Wakatsuki 1-1-1 Mishimae, Takatsuki City, Osaka Prefecture (56) References JP-A-3-81458 (JP, A) JP-A-6-322996 (JP, A) JP-A-2-130945 (JP, U) (58) Fields surveyed (58) Int.Cl. ⁷ , DB name) E04G 21/32 E04G 21/24 E04G 1/26

Claims (6)

(57) [Claims] 1. A method for stretching a work safety net in a space surrounded by front, rear, left and right beams in a steel structure, wherein the work safety net is suspended from the beams at predetermined intervals in the longitudinal direction. A net using an upward U-shaped scaffolding board bridging frame and extending between the horizontal frame portions of these scaffolding board bridging frames in parallel with the beam material and provided with a net hook at a required interval in the longitudinal direction. A method for stretching a work safety net in a steel structure in which a mounting rod is bridged and a required portion of the work safety net is hung on a net hook of the net mounting rod to stretch the net. 2. A mounting rod main body, a plurality of net hooks provided at required intervals in the longitudinal direction of the mounting rod main body, and detachable hooks provided at both ends of the mounting rod main body. /> of Ri, each net latching bracket is approximately W of vertically opposite to each other
It consists of a pair of linear bodies formed in a letter shape, and both linear bodies are
The mounting rod body in the form of a square tube
To be slidable in the longitudinal direction
A pair of net ropes on both sides on the left and right sides of the attached rod body
Net attachment rod for work safety net stretcher formed with a part . 3. A mounting rod body and a longitudinal direction of the mounting rod body.
A plurality of net hooks provided at required intervals and
From the attaching and detaching hooks provided on both ends of the mounting rod body
And the net hooks fit externally into the fixed position of the mounting rod body.
It consists of a fixed end-shaped ring, both ends of which ring
Forms a net rope engaging / disengaging part on the top side of the mounting rod body
Net mounting rod for working safety net tension made. 4. A mounting rod main body and a longitudinal direction of the mounting rod main body.
A plurality of net hooks provided at required intervals and
From the attaching and detaching hooks provided on both ends of the mounting rod body
Each of the net hooks is fixed at a fixed position on the mounting rod body.
Ended phosphorus pivotally attached to the side surface of the rod body
And both ends of the ring
Net mounting rod for work safety net stretcher formed . 5. A mounting rod body and a longitudinal direction of the mounting rod body.
A plurality of net hooks provided at required intervals and
From the attaching and detaching hooks provided on both ends of the mounting rod body
At least the end of each net hook is L-shaped
It consists of a pair of linear bodies formed in a shape, and both linear bodies
At the fixed position of the rod body,
A net mounting rod for a work safety net stretch formed with a rope engaging / disengaging portion . 6. The net mounting rod according to claim 2, wherein the mounting rod body is formed of a plurality of members that are telescopically joined to each other so as to be telescopic. .