JP2532997Y2 - Fall prevention device for duct connection of slab opening - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing a slab opening from falling at various construction sites.

[0002]

2. Description of the Related Art In an architectural site, accidents involving workers falling down from openings formed in a part of a slab and accidents caused by falling objects are inevitable. In view of the current situation, for example, a method is adopted in which the periphery of the slab opening is surrounded by handrails to prevent intrusion of workers, or a plywood or a steel plate is covered and easily fixed to close the slab opening. Have been.

[0003]

Problems to be Solved by the Invention There are the following problems in the above-mentioned conventional fall prevention technology. <B> In the method of surrounding with a handrail or the like, the accident of a falling object cannot be prevented because the opening is left exposed. <B> In the method of closing the opening with plywood or steel plate, the plate is easily displaced or deformed during construction. As a result, there are many accidents in which workers who are unaware of this fall on a board and fall, leaving concerns about safety. <C> As a method of preventing such a fall accident, a method of frequent maintenance of fall prevention devices and facilities can be considered, but in the current situation where securing labor is difficult and labor costs are rising Difficult to adopt, easily. Under these circumstances, there is a strong demand for a proposal for a highly safe and maintenance-free fall prevention technique. <D> The opening of the slab is formed using a box form by on-site assembling, but the assembling of the form takes a lot of trouble and the assembling accuracy is low. When the slab opening is used as a duct space, a relay duct must be attached after the mold is removed, which requires more trouble.

[0004]

[Purpose of the present invention] The present invention has been made in order to solve the above-mentioned problems. The purpose of the present invention is to reliably prevent a fall accident, to eliminate maintenance during construction, and to provide excellent workability. Another object of the present invention is to provide a device for preventing a slab opening from falling.

[0005]

Means for Solving the Problems] The present invention is, duct
Drop prevention installed at the opening of the slab for connecting
In stop device is installed in the opening position of the slab, duct
For duct connection with upper and lower ends open to connect
A box, a detachable upper lid that closes an upper end opening of the box, and a cover that is disposed in the box and passes through the box.
And a member for preventing falling.
This is a fall prevention device for connecting a duct to a slab opening .

[0006]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a case where the slab is used for opening a duct opening will be described.

<A> Overall Configuration FIG. 1 is a perspective view of a fall prevention device used for opening a duct opening, and FIG. 2 is a cross-sectional view of the fall prevention device installed on the slab 1. The fall prevention device is a top and bottom open type box 2
And an upper lid 3. Since the dimensions of the box 2 and the top cover 3 are specified, they can be manufactured with high precision in a factory or the like where processing equipment is provided.

<B> Box The box 2 has a rectangular shape with four sides surrounded by an iron plate, and the height of the side surface is set higher than the slab thickness to be constructed.
A flange 5 is formed on the periphery of the upper end of the box 2 so as to be bent at right angles to the side surface of the box 2. Flange 5 in the drawing
Is extended inside the box 2, but may be extended outside. A plurality of steel rods 6 are attached in a grid between opposing side surfaces in the box 2 to form a fall prevention net. Further, a duct connection flange 7 is attached to the inside of each side surface of the box 2 and below the fall prevention net, and a plurality of bolt mounting holes 8
Has been established. On the outer side of the side surface of the box 2, a dowel 9 for preventing falling off from the slab 1 is provided.

<C> Upper Lid The upper lid 3 is made of a steel plate having a strength such that it is not easily deformed even when an operator gets on it. In this embodiment, the case where the upper lid 3 is attached to the box body 2 by bolting is shown. However, it is needless to say that a known connecting mechanism to which the upper lid 3 can be attached and detached can be adopted.

[0010]

Next, a method of using the fall prevention device will be described.

<A> Setting of Fall Prevention Device As shown in FIG. 2, an unillustrated mold for slab construction is assembled, and the box 2 is set at a position where the opening 11 is to be opened. At this time, the upper opening of the box 2 is closed with the upper lid 3. Next, the slab 1 is constructed by casting concrete. The upper part of the box 2 is set so as to protrude from the upper surface of the slab 1. During the construction of the slab 1, even if a worker accidentally gets on the top cover 3 or various work equipment hits the fall prevention device, the bolted top cover 3 does not come off the box 2.

<B> Duct connection work When the construction work of the slab 1 is completed, the upper lid 3 is removed from the box 2 as shown in FIG.
2 and 13 are connected respectively. Before the ducts 12 and 13 are attached, even if the top cover 3 is removed, the plurality of steel rods 6 traversing the inside of the box 2 prevent the worker from falling down and the equipment from falling. In this embodiment, the case 2 of the fall prevention device is used as a component of the duct. That is, one ends of the ducts 13 and 14 are respectively connected to the flanges 5 and 7 formed on the upper and lower edges of the box 2 by abutting bolts.

[0013]

Embodiment 2 The present invention can also be applied to an electric cable rack, a concrete duct opening curing, a building slab opening (useless hole), and the like. The presence or absence and the installation position of the flange 5 and the flange 7 are appropriately designed according to the purpose of use.

[0014]

[Effects of the Invention] The present invention is as described above, and the following effects can be obtained. <B> Fall prevention measures are implemented twice by the fall prevention net with the upper lid and the bar, so that the fall accident of the worker and the fall accident of the equipment as before can be surely prevented, and the work environment Safety is significantly improved. <B> No maintenance is required during the construction period. <C> Since it is suitable for mass production, the labor of production can be reduced as compared with the case of on-site production. <D> When used for a duct, the box can be used not only for preventing falling but also as a component of the duct, which can greatly improve workability.

[Brief description of the drawings]

FIG. 1 is a perspective view of a fall prevention device according to the present invention.

FIG. 2 is a cross-sectional view of a fall prevention device set on a slab.

FIG. 3 is a sectional view of a fall prevention device when a duct is connected.

Claims (1)

(57) [Scope of request for utility model registration] 1. An opening in a slab for connecting a duct.
In the installed fall prevention device is being placed in the opening of the slab, the upper so as to connect the duct
A duct connection box having open ends and a lower end, a detachable upper lid for closing an upper end opening of the box, and disposed in the box, falling through the box
A fall prevention device for connecting a duct at a slab opening , comprising: