JPH086451B2 - Safety lid for slab opening and its mounting method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a safety cover for a slab opening and a mounting method thereof.

[Prior art and its problems] Generally, when building a building such as reinforced concrete, the floor slab is provided with openings for carrying out formwork and supporting materials, and for allowing workers to enter and exit. In the double slab of the part, it is used as an inspection port after the slab is constructed, and it is a dead hole that is finally closed.

The slab opening as described above is usually covered with a lid during construction to prevent it from falling, and it is designed to be used with the lid removed when carrying in and out of materials and when workers are in and out. There is.

However, after the materials have been carried in and out and the workers have gone in and out, it is often the case that they forget to put the lid on again, and the self due to the falling of the materials and the workers was not constant.

In addition, since there is no handrail when entering and exiting the opening, there are inconveniences such as difficulty in entering and exiting.

[Object of the Invention] The present invention has been made in order to solve the above-mentioned problems of the prior art. The object of the present invention is to enable the lid to be opened and closed easily and quickly, and to allow safe entry and exit. A safety lid for a slab opening and a method of mounting the safety lid.

[Configuration of the Invention] A safety cover for a slab opening of the present invention includes a stepped frame attached to an inner peripheral edge of the slab opening, a lid body pivotally attached to the stepped frame so as to be openable and closable, and a tip of the lid body. The stepped frame is fixed to the inner peripheral edge of the slab opening by level adjustment with an anchor sleeve, and is composed of a pair of handrail rods pivotally attached to the portion and a support rod supporting the handrail rod. The tip of the handrail rod is pivotally attached to the support rod, or the handrail rod is integrally formed with the support rod,
It is configured to be folded on the back side of the lid body, and is further characterized in that a reinforcing handrail rod that connects the pair of handrail rods to each other is detachably provided. According to the method of attaching a safety lid for a slab opening of the present invention, an anchor sleeve is level-adjusted and set on a slab form via an anchor bolt, and a stepped frame in which a lid is pivotably attached is also used as the anchor sleeve. It is characterized in that it is fixed to the slab to form the form of the slab opening, and slab concrete is poured.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 is a slab opening, and a stepped frame 2 is attached to the inner peripheral edge thereof. As shown in FIG. 2, the stepped frame 2 is fixed to the anchor sleeve 4 embedded in the slab 3 by a fixing bolt 5.

The stepped frame 2 also serves as a mold.
The anchor sleeve 4 is screwed to the anchor bolt 6, and the level L is adjusted before the concrete of the slab is poured. 7 is a slab formwork.

Referring again to FIG. 1, reference numeral 8 denotes a lid body, one end of which is pivotally attached to the stepped frame 2 by a pin 9.
It can be opened and closed.

Reference numeral 10 is a handrail rod, one end of which is pivotally attached to the tip of the lid 8 by a pin 11.

Reference numeral 12 is a support rod, the upper end of which is pivotally attached to the other end of the handrail rod 10 by a pin 13, and the lower end of the support rod 12 is pivotally attached to the stepped frame 2 by a pin 14. There is.

Reference numeral 15 is a reinforced handrail rod, one end of which is one handrail rod.
It is pivotally attached to the tip portion of 10 or the support rod 12, and the other end portion is detachably attached to the tip portion of the other handrail rod 10 or the support rod 12.

Since the safety lid of the above embodiment is configured as described above, when the lid 8 is covered with the slab opening 1 from the open state shown in FIG. 1, first, one end of the reinforcing handrail rod 15 is And the handrail rod 10 and the support rod 12 are bent inward (in the direction of the slab opening 1) as shown by the imaginary line.

When the handrail rod 10 and the support rod 12 are bent inward, the lid 8
Is slightly opened to the outside in the state of the virtual line, but the handrail rod 10
When the support rod 12 is further folded inward, the lid 8 is indicated by the arrow A.
The slab opening 1 is closed by rotating in the direction.

To open the lid body 8, the above operation may be performed in reverse.
When the cover 8 shown in FIG. 1 is opened, the support rod is
The lower end of 12 is fixed to the stepped frame 2 so that the handrail rod 10 and the lid 8 are stabilized.

FIG. 3 shows another embodiment of the present invention, in which 16 is a lid, which is pivotally attached to a stepped frame 2 attached to the inner peripheral edge of the slab opening 1 so as to be openable and closable.

Reference numeral 17 is a handrail rod, the tip of which is bent downward to form a support rod 18. A base end portion of the handrail rod 17 is pivotally attached by a pivotal attachment 19 so as to be pivotable in the lateral direction. A slide sleeve 20 is attached to the lower end portion of the support rod 18 so as to be vertically slidable, and as shown in FIG.
It is adapted to be inserted and fixed to a fixing pin 21 which is planted in the stepped frame 2. A notch 16a is formed on the upper edge of the lid body 16 so that the fixing pin 21 does not come into contact with the lid body 16 when the lid body 16 is put on the slab opening 1.

 22 is an auxiliary handrail.

Therefore, when closing the lid 16 to the slab opening 1,
First, after removing one end of the reinforcing handrail rod 22, the slide sleeve 20 at the lower portion of the support rod 18 is lifted, pulled out from the fixing pin 21, and folded to the inner surface of the lid body 16 as shown in FIG. In this state, the lid 16 is rotated as shown by the arrow B to cover the slab opening 1.

When opening the lid 16, the above operation may be performed in reverse.

It is convenient to attach a ladder having an appropriate structure to the lids 8 and 16 or the stepped frame 2.

[Advantages of the Invention] (1) The lid can be opened and closed easily and simply by operating the handrail rod and the support rod, and when the lid is opened, the handrail is set at the same time.

(2) Since the lid opened by the handrail rod and the support rod is held, a special means for holding the lid can be omitted.

(3) Since the handrail bar is provided, it is possible to not only safely enter and exit, but also the handrail bar serves as a safety shelf even in the opened state to prevent the handrail bar from falling.

(4) Since the stepped frame can be easily removed, it can be reused.

(5) Due to the stepped frame, the inner surface of the opening is well partitioned, the mold can be easily removed, and the inspection port can be easily attached.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of an inner edge portion of a slab opening, FIG. 3 is a perspective view showing another embodiment, and FIG. 4 is a supporting rod. FIG. 5 is an enlarged view showing the fixing means of FIG. 5, and FIG. 5 is a perspective view of the handrail rod and the support rod in a folded state. 1 ... Slab opening, 2 ... Stepped frame, 3 ... Slab, 4 ... Anchor sleeve, 5 ... Fixing bolt, 6 ...
… Anchor bolts, 7 …… Slab formwork, 8 …… Lid,
9 …… pin, 10 …… handrail rod, 11 …… pin, 12 …… support rod, 13,14 …… pin, 15 …… reinforced handrail rod, 16 …… cover,
A, B ... Arrow, L ... Level.

Claims (7)

[Claims] 1. A stepped frame attached to the inner peripheral edge of a slab opening, and a lid body pivotally attached to the stepped frame so as to be openable and closable.
A safety cover for a slab opening, comprising a pair of handrail rods pivotally attached to the tip of the lid and a support rod for supporting the handrail rods. 2. The safety cover for a slab opening according to claim 1, wherein the stepped frame is fixed in level by an anchor sleeve and fixed to an inner peripheral edge of the slab opening. 3. A safety cover for an opening of a slab according to claim 1 or 2, wherein the tip end of the handrail rod is pivotally attached to a support rod. 4. The handrail rod is integrally formed with a support rod, and is constructed so as to be folded toward the back surface side of the lid body. Safety lid for slab opening described in. 5. A reinforcing handrail rod is pivotally attached to one end of one of the pair of handrail rods, and detachably attached to the other end.
The safety lid for a slab opening according to any one of the items 1, 2, 3, or 4. 6. The method according to any one of claims 1, 2, 3, 4, or 5, wherein a ladder is attached to the lid. Safety lid for slab opening. 7. A mold for forming a slab opening by setting a level adjustment of an anchor sleeve on an slab frame via anchor bolts and fixing a stepped frame having a lid body pivotably attached to the anchor sleeve to the anchor sleeve. A method for mounting a safety lid for a slab opening, characterized by placing a slab concrete without a frame.