JP2003074189A - Hook mechanism and stretching method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hook mechanism and a stretching method, which allow a suspended object to be safely and surely stretched from a structure, and which enable the suspended object to be surely dismantled by conducting simple operations from below while avoiding high lift work after prescribed work. SOLUTION: The hook mechanism and the stretching method comprises: a hook 5 which is equipped with a mounting member 4 for being deployed in a stretching structure 10 and a holding part engaged with the mounting member 4; and a detachable coupling body 6 for coupling the mounting member 4 with the holding part of the hook 5. The hook mechanism and the stretching method not only simplify and solidify a coupling between the stretching structure 10 and the hook 5 but also facilitate disengagement of the hook 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook mechanism and a tensioning method, and more particularly, to a hook mechanism and a tensioning method that allow a suspended object to be safely stretched and securely removed by a simple operation after a predetermined work.

[0002]

2. Description of the Related Art In the construction of concrete structures and slab openings in the field of construction, it is essential to attach a safety net to prevent accidents caused by falling objects and falls and ensure safety. It is being appreciated.

For hanging a safety net, a hanging metal fitting is provided on the wall surface of an opening in a concrete structure by a mounting bolt, and a hanging strap of the safety net is hooked on the hook of the hanging metal fitting to secure the safety net. A net suspension device (see Japanese Patent Laid-Open No. 10-37480) or a safety net suspension device in which a suspension device is attached so as to sandwich a flange portion of a steel frame material, and a safety net or the like is stretched on a hook portion formed on the suspension device. (Japanese Unexamined Patent Publication No. 9-67936), or a clamp attached to a steel beam or a column is equipped with a hanging hook, and a clamp for locking a safety net to the hanging hook (Actual Kaihei 7-6400, Actual Kaihei 6-78520). ) Etc. have been adopted.

However, each of these methods has a lower flange 3 of a steel frame 2 constituting a building structure as shown in FIG.
It is basically provided that a hook 20 that is opened upward is provided on the above, and the fall prevention net 8 or the like is stretched on the hook 20.

Thus, as is clear from the construction process of FIG. 7, the construction work above the steel frame 2 shown in FIG. 7 (a) utilizes the hook 20 of the lower flange 3 of the steel frame 2 to prevent the fall net 8. Even in situations where the floor is stretched, accidents due to falling objects and falls from above are prevented, ensuring safe construction.

However, as shown in FIG. 7B, the steel frame 2
In the state after the construction of the slab deck 21 above the above, the slab deck 21 closes the upper part of the fall prevention net 8 so that it is released from the hook 20 of the lower flange 3 of the steel frame 2. It is impossible to dismantle the fall prevention net 8 by pulling it upwards and removing it.

Similarly, as shown in FIG. 7 (c), the fall prevention net 8 is provided by disposing the stepladder 22 on the lower floor slab 17.
When removing it, the tension due to the weight of the fall prevention net 8 is large, and the work to counter this is forced to be extremely unstable and dangerous work.

On the other hand, in order to avoid this dangerous work,
When forming a scaffold for dismantling or arranging an aerial work vehicle, the cost was soared and extra cost was required.

[0009]

DISCLOSURE OF THE INVENTION The present invention is proposed in order to solve the problems in view of the above situation, and makes it possible to safely and surely suspend a suspended object to a structure.
(EN) Provided are a hook mechanism and a tensioning method capable of surely dismantling a suspended object by a simple operation from below while avoiding work at a high place after a predetermined work.

[0010]

SUMMARY OF THE INVENTION A hook mechanism according to the present invention is basically a hook having a mounting member for deployment in a stretched structure and a holding portion for engaging the mounting member, and the mounting member and the holding of the hook. It is composed of a detachable combined body that connects the parts with each other.Specifically, the mounting member is made of an iron pipe and the hook is made of round steel that can be inserted into the iron pipe. The structure is made of an iron pipe, the mounting member is made of round steel that can be inserted into the iron pipe, and the detachable joint is a split pin with a detachment prevention mechanism, which connects the tension structure and the hook. The hook is simple and solid, and the hook can be easily removed.

Further, in the tensioning method according to the present invention, the hook mechanism described above is provided by welding an attaching member to a predetermined position of the tension structure, and a hanging object such as a safety net is tensioned on the hook mechanism. After suspending and carrying out a predetermined work, the hook and the hook are separated from the iron pipe to remove the suspended object and the hook from the suspended structure. In addition to making sure that the rack is secure, the suspended object is surely dismantled by a simple operation from below after the work is completed.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A hook mechanism according to the present invention is a hook including a mounting member for deployment on a stretched structure and a holding portion for engaging the mounting member, and a detaching / connecting portion for connecting the mounting member and the holding portion of the hook. It is composed of a flexible combined body, and the mounting member is made of iron pipe and the hook is made of round steel that can be inserted into the iron pipe. Conversely, the hook is made of iron pipe and the mounting member is made of iron pipe. It is characterized in that it is made of round steel that can be inserted into, and the detachable combined body is a split pin with a detachment prevention mechanism.

Hereinafter, an embodiment of a hook mechanism according to the present invention will be described in detail with reference to the drawings, but in order to facilitate understanding, the same parts as those in the conventional art are denoted by the same reference numerals.

FIG. 1 is a perspective view showing a first embodiment of a hook mechanism according to the present invention. The mounting member is made of an iron pipe and the hook is made of a round steel insertable into the iron pipe. The figure shows a state in which a fall prevention net is suspended on a frame structure.

In the drawings, reference numeral 1 denotes a hook mechanism according to the present invention, which is welded to a lower flange 3 of a steel frame 2 in the present embodiment.

The hook mechanism 1 includes an iron pipe 4 bent from the middle to the front at a predetermined angle, and the iron pipe 4.
The hook 5 and the split pin 6 fixed to the iron pipe 4 to prevent the hook 5 from being detached from the iron pipe 4.
It consists of

The hook 5 is bent so that its tip 7 is inclined upward with respect to the lower flange 3 of the steel frame 2. By hooking the hanging string 9 of the fall prevention net 8 as shown in the drawing, the steel frame The fall prevention net 8 is securely stretched over the opening portion of the stretched structure 10 composed of 2 etc. to prevent accidents due to falling objects or falls from above to ensure safe construction.

The fixed state of the iron pipe 4 and the hook 5 will be described with reference to a partial cross section in the embodiment shown in FIG.

The iron pipe 4 welded to the lower flange 3 of the steel frame 2 has a hole 12 for inserting the split pin 6 in the vicinity of the tip of the lower portion 11 bent at a predetermined angle.
12 are formed, and the holes 12 and 12 form the stretched structure 10
Perforated vertically.

The hook 5 is formed by bending it into a hook shape, and is detachably mounted by inserting it into the bent lower portion 11 of the iron pipe 4 from its tip. The hook 5 is arranged upward with respect to the lower flange 3 of the steel frame 2 so that the tip end 7 of the hook 5 is orthogonal to this. In this embodiment, the hook 5 is provided in the holding portion 13 of the hook 5 and the hole 12 of the iron pipe 4 is provided. , 12 are established by drilling in the same direction as the direction in which the tip 7 of the hook 5 is bent.

That is, in the hook 5 mounted on the lower portion 11 of the iron pipe 4, the split pin 6 is inserted into the holes 12, 12 of the iron pipe 4.
The holes 5 of the hook 5 and the hook 5 are fixed to each other while establishing a firmly connected state. In this state, the hook 5 has its tip 7 with respect to the lower flange 3 of the steel frame 2. It is arranged so as to be orthogonal to each other.

The split pin 6 is composed of a round bar as shown in the figure or a thin plate different from this, and has a mechanism for preventing the split from coming off the iron pipe 4 after it is inserted into the iron pipe 4 and the hook 5. It is provided. The separation prevention mechanism in the present embodiment is configured by a spring protrusion 15 that elastically prevents from coming off by forming a bulge that engages with the iron pipe 4 in the middle portion as shown in the figure.

The hook mechanism 1 according to the present embodiment includes an iron pipe 4 which is a mounting member for the lower flange 3 of the steel frame 2.
It is fixed by welding and is easily equipped with simple construction means.

As a result, the fall prevention net 8 stretched around the opening of the tension structure 10 composed of the steel frame 2 and the like.
Is securely held to prevent accidents due to falling objects or falls from above, ensuring safe construction.

FIG. 3 is a perspective view showing a second embodiment of the hook mechanism according to the present invention, in which the hook is made of iron pipe and the mounting member is made of round steel insertable into the iron pipe. There is.

The hook mechanism 1'in this embodiment is
Fix the mounting member 4'made of round steel bent from the middle to the end at a predetermined angle, the hook 5'made of an iron pipe into which the mounting member 4'can be inserted, and the mounting member 4'to the hook 5 '. The split pin 6 is configured to prevent the detachment.

The mounting member 4'is formed with a hole 14 'for inserting the split pin 6 in the vicinity of the tip of the lower portion 11' bent at a predetermined angle, and the hole 14 'is a tension structure. Perforations are made in the vertical direction of the structure.

The hook 5'is formed by being bent in a hook shape, and the holding portion 13 'of the hook 5'is attached to the mounting member 4'.
It is detachably installed by being attached to the bent lower part 11 'of the. The hook 5'is arranged upward with respect to the lower flange of the steel frame so that its tip 7'is orthogonal, but in this embodiment, the holding portion 1 of the hook 5'is
The holes 12 ', 12' provided in 3'and communicating with the hole 14 'of the mounting member 4'are established by drilling in the same direction as the bending direction of the tip 7'of the hook 5'.

As a result, the lower part 1 of the mounting member 4'is
The hook 5 ′ attached to the 1 ′ has the cotter pin 6 hook 5 ′.
By inserting the holes 12 ', 12' of the mounting member 4'and the holes 14 'of the mounting member 4', a firmly connected state is established, and in this state, the hook 5'has its tip 7'of the steel frame. It can be placed upwards so as to be orthogonal to the lower flange.

As in the above-described embodiment, a mechanism is provided for preventing the split pin 6 from being detached from the mounting member 4'after the split pin 6 is inserted into the mounting member 4'and the hook 5 '. is there.

The hook mechanism 1'in this embodiment is
Since the mounting member 4'is made of round steel, the tension structure 10
When this is mounted on the lower flange 3, since welding is facilitated by welding solid round steel to the steel material, it can be carried out by a simple construction means.

As described above, in the hook mechanism according to the present invention, the fall-prevention net 8 is securely stretched over the opening portion of the tension structure 10 by the structure shown in each of the above-mentioned embodiments, and the fall mechanism is dropped from above. We ensure safe construction by preventing accidents due to objects and falls, but in addition to this, even after the work is completed, it is difficult to dismantle the fall prevention net that has been pointed out conventionally and work at heights The problem of unstable dangerous work due to the problem of high cost due to disassembling scaffolding or arranging aerial work vehicles can be used to securely dismantle suspended objects such as a crash prevention net with simple operation from below. It is solved at the same time by doing.

The state after completion of these operations is shown in FIG.
It can be easily understood by the hook release state diagram in the hook mechanism shown in FIG.

That is, in the hook mechanism according to the present invention, the hook 5 can be easily released from the iron pipe 4 by a simple operation of pulling out the split pin 6 from the iron pipe 4 as shown in the drawing, and the fall prevention net. It is possible to easily and surely dismantle suspended objects such as.

As described above, the iron pipe 4 and the hook 5 are fixed by the split pin 6, and the bulge of the spring projection 15 provided on the split pin 6 is engaged with the iron pipe 4 so as to be elastic. It is designed to prevent slipping out.

In the state where the fall prevention net is suspended on the hook 5, the iron pipe 4 and the hook 5 apply a shearing force to the split pin 6, so that the joined state is more reliable. The pin 6 is elastically mounted with a spring projection 15 provided to prevent the pin from coming off. Therefore, when the operation rod 18 is hooked to the suspension ring 16 of the split pin 6 and pulled out, the split pin 6 is compared. It can be easily removed.

The hook 5 after the split pin 6 is removed is
As shown in FIG. 3, the fall prevention net 8 is pulled out from the iron pipe 4 so as to naturally fall together with the fall prevention net, or the tip 7 of the fall prevention net is rotated to dismantle only the fall prevention net first. Reach a state.

Therefore, after the work is completed, the fall prevention net can be disassembled very easily by surely releasing the hook from the iron pipe only by pulling out the split pin 6.

Next, the stretching method according to the present invention will be described. The tensioning method according to the present invention is provided with the hook mechanism described above by welding the attachment portion at a predetermined position of the tension structure, and suspending a hanging object such as a safety net on the hook mechanism so as to perform a predetermined operation. After the work is completed, the suspended object and the hook are removed from the suspended structure by removing the combined body of the hook mechanism from the iron pipe, and it is possible to securely suspend the suspended object such as a safety net. After the work is completed, the suspended objects are surely dismantled by a simple operation from below.

FIG. 5 shows an embodiment of the step of removing the suspended object from the suspended structure in the method of stretching according to the present invention.
It will be described in detail based on.

The hook mechanism 1 according to the present invention detachably fixes the iron pipe 4 welded to the lower flange 3 of the steel frame 2, the hook 5 inserted therein, and the iron pipe 4 and the hook 5. It is composed of split pins 6, and by hooking the fall prevention net 8 on the hooks 5 and stretching it on the stretched structure, accidents due to falling objects from above or a fall are prevented and secure construction is secured. .

After the predetermined work is completed, when the slab deck 21 is constructed above the fall prevention net 8 and the fall prevention net 8 is dismantled in a state in which the upper portion is closed, the suspension according to the present invention is stretched. In the method, as shown in FIG. 5, while using the operating rod 18 from the lower floor slab 17, the split pin 6 that constitutes the hook mechanism 1 is only pulled out from the iron pipe 4 to release the hook 5, and the crash The prevention net 8 is dismantled.

Therefore, the dismantling work of the fall prevention net can be carried out very easily without disposing a stepladder or an aerial work vehicle on the floor slab below even if the slab deck 21 is closed above the fall prevention net 8. Therefore, work at high places and unstable dangerous work are eliminated, and the cost for assembling scaffolds for dismantling and arranging work vehicles at high places is eliminated, thereby improving work efficiency and reducing costs.

The present invention has been described in detail above based on the embodiments. However, the hook mechanism and the tensioning method according to the present invention are not limited to the above-mentioned embodiments, and can be applied to iron pipes and hooks. It goes without saying that various modifications can be made to the specific shape and the like without departing from the spirit of the present invention.

[0045]

The hook mechanism according to the present invention is a hook having a mounting member for deploying on a stretched structure and a holding portion for engaging the mounting member, and a detachable connecting member for connecting the mounting member and the holding portion of the hook. Since it is composed of a combined body, it makes the connection between the tension structure and the hook simple and solid, and
It has the effect of making it easy to remove the hook.

Further, the hook mechanism according to the present invention is characterized in that the mounting member is made of an iron pipe and the hook is made of round steel that can be inserted into the iron pipe. This has the effect of facilitating hook processing and reducing costs.

Furthermore, the hook mechanism according to the present invention is characterized in that the hook is made of an iron pipe and the mounting member is made of round steel that can be inserted into the iron pipe. It has the effect of facilitating the welding of members and improving the construction efficiency.

In the tensioning method according to the present invention, each hook mechanism described above is provided by welding an iron pipe at a predetermined position of the tension structure, and a hanging object such as a fall prevention net is tensioned on the hook mechanism. After suspending and performing a predetermined work, the hanging body and the hook are detached from the tension structure by detaching the combined body of the hook mechanism from the iron pipe, so that the following effects are achieved.

The suspension of suspended objects such as safety nets is ensured. With a simple operation from below, the work of dismantling the fall prevention net can be achieved. Eliminate high-altitude work and unstable dangerous work. It eliminates the need for dismantling scaffolds and aerial work vehicles, improving work efficiency and reducing construction costs.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a hook mechanism according to the present invention.

FIG. 2 is a partial sectional view of an embodiment of a hook mechanism according to the present invention.

FIG. 3 is a partial sectional view of another embodiment of the hook mechanism according to the present invention.

FIG. 4 is a diagram showing a released state of the hook in the embodiment of the hook mechanism according to the present invention.

FIG. 5 is an embodiment diagram showing a step of removing a suspended object from a stretched structure.

FIG. 6 is a drawing of a conventional fall prevention net provided with a hook on a lower flange of a steel frame.

[Fig. 7] A diagram of a conventional dismantling state of a crash prevention net

[Explanation of symbols]

1 hook mechanism, 2 steel frame, 3 lower flange,
4, 4'mounting member, 5, 5'hook, 60 split pin, 7, 7'tip, 8 fall prevention net, 9
String, 10 tension structure, 11, 11 'lower part,
12, 12 'hole, 13, 13' holding part, 14, 1
4'hole, 15 spring protrusion, 16 suspension ring, 17
Floor slab, 18 control rod, 20 hook, 21 slab deck, 22 stepladder,

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hitoshi Nakajima             Shimizu Construction 1-3-2 Shibaura, Minato-ku, Tokyo             Within the corporation (72) Inventor Tsunato Kishino             Shimizu Construction 1-3-2 Shibaura, Minato-ku, Tokyo             Within the corporation F-term (reference) 2E184 JA05 KA06 KA08 KA11 LC05

Claims (5)

[Claims] 1. A mounting member for deployment in a stretched structure,
A hook mechanism comprising a hook having a holding portion that engages with the mounting member and a detachable coupling body that connects the mounting member and the holding portion of the hook. 2. The hook mechanism according to claim 1, wherein the attachment member is made of an iron pipe, and the hook is made of round steel insertable into the iron pipe. 3. The hook mechanism according to claim 1, wherein the hook is made of an iron pipe, and the mounting member is made of round steel insertable into the iron pipe. 4. The hook mechanism according to claim 1, wherein the detachable coupling body is a split pin with a detachment preventing mechanism. 5. The hook mechanism according to any one of claims 1 to 3 is provided with a mounting member by welding at a predetermined position of a tension structure, and a hanging object such as a safety net is stretched on the hook mechanism. A stretching method in which the suspended object and the hook are removed from the suspension structure by detaching the combined body of the hook mechanism from the mounting member when the operation is completed.