JPH06280277A - Protection cover of slab opening section - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide an economical protective cover for slab openings that is safe, has sufficient strength, and can be used repeatedly. [Structure] The protective cover of the slab opening includes an outer frame 3, a fixing member including a fixed metal piece 4 and a slide metal piece 5, an openable / closable upper lid body 8 and an upper lid support bar 13. The protective lid is detachably fixed to the slab opening by the fixing member,
The upper lid main body is rotatably supported by the outer frame, and the upper lid support bar detachably engages with the upper lid main body to hold it at a predetermined angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective lid for opening and closing a slab which can be repeatedly used.

[0002]

2. Description of the Related Art Conventionally, during work such as road construction, underground piping burying work, and construction, temporary opening of manholes and slab openings such as underfloor inspection openings or floor openings for replacement of equipment and pipes installed under the floor. In order to protect automatically, the lid is cut out from the scaffolding plate or processed, and simply placed on the slab opening or fixed to the opening.However, by placing the lid on the opening, Since the lid made from scaffolding is not strong enough, it is loose and easily broken, and if the lid is attached too firmly, there is a risk of accidentally cutting out the cover restoration later, which is a problem. In addition, the conventional temporary lid is disposable and uneconomical.

[0003]

Therefore, the present invention is
It is an object of the present invention to provide a slab opening protective cover that is safe, has sufficient strength, and can be repeatedly used, and is economical.

[0004]

That is, the present invention is a protective cover for an opening of a slab, which includes an outer frame placed around the opening of the slab, a fixing member including a fixed metal object and a slide metal object, and an opening / closing means. The outer frame has a shape corresponding to the slab opening, and the fixed metal piece pays attention to the outer frame, and the slide metal piece is arranged in the thickness direction of the slab. The protective lid is slidably engaged with the fixed hardware, so that the protective lid is detachably fixed to the slab opening by the fixing member, and the upper lid main body has a shape corresponding to the slab opening and pivots to the outer frame. The gist of the present invention is a protective cover for an opening of a slab, which is rotatably supported, and the upper cover support bar is detachably engaged with the upper cover body to hold it at a predetermined angle.

The present invention will be described in detail below with reference to the drawings.

Referring first to FIGS. 1 and 2, FIG. 1 is a side sectional view for explaining a state in which the protective lid of the present invention is attached to a slab opening, and FIG. 2 shows an example of the protective lid of the present invention. A plan view is shown with a part of the top cover material cut away. Here, 1 is a slab, 2 is a slab opening, 3 is an outer frame, 4 is a fixed metal object, 5 is a slide metal object, 6 is a fastening tool (bolt and nut), 7 is a fastening tool (bolt), and 8 is Upper lid body, 9 upper lid laying material, 10 upper lid frame, 11 shaft support, 12 lower frame,
Reference numeral 13 is an upper lid support bar, and 14 is a floor covering frame.

The outer frame 3 has a shape corresponding to the slab opening 2, and the size of the outer frame 3 is slightly larger than the opening and is placed around the opening. Although the shape of the outer frame 3 is shown as an L-shaped cross section in FIG. 1, the shape is not limited to this.
As long as a predetermined engagement relationship with the fixed hardware 4 and the upper lid body 8 can be maintained, an appropriate one can be selected.

The fixed metal piece 4 forms a fixing member together with the slide metal piece 5 and the fastener 6, and engages with the outer frame 3 to fix it to the slab 1. The fixed hardware 4 may be fixed to the outer frame 3 in advance by welding or may be a separate body. By making the fixed hardware 4 separate from the upper lid body 8, the bulk of the protective lid of the present invention can be reduced, and the thickness of the slab 1, the width and shape of the slab opening 2 (for example, whether or not the sidewall of the opening is inclined). It is also possible to deal with the situation by changing only one of the upper lid main body 8 and the fixing member even if the degree or the like) changes. The shape of the fixed hardware 4 is shown as having an L-shaped cross section in FIG. 1, but it will be easily understood that the shape is not limited to this.

The slide metal piece 5 is generally L-shaped and is slidably and detachably engaged with the fixed metal piece 4 in the thickness direction of the slab 1 (that is, up and down). And the slab 1 as well. The lower end of the slide hardware 5 is positioned at a predetermined position on the slab 1 by the fastener 7.

Referring now to FIG. 3, FIG. 3 (a) is a side sectional view showing a state in which the fixing member is attached to the slab opening 2, and FIG. 3 (b) is a front view. Since the slide metal piece 5 is slidable with respect to the fixed metal piece 4, a vertical hole 15 extending in the thickness direction of the slab 1 is usually provided at substantially the center thereof. If desired, the vertical holes 15 may be provided in two or more. As shown in FIG. 3, when the thickness of the slab 1 is up to a, the slide hardware 5 is fixed at the position shown by the solid line, but when the slab 1 has a thickness up to b,
The slide metal piece 5 is slid downward and fixed at the position indicated by the chain line. Further, in order to make the slide hardware 5 slidable, for example, grooves are provided on both sides of the slide hardware 5 in the vertical direction, and the slide hardware 5 is fixed to the fixed hardware 4 by two or more fasteners. It is also possible to employ a mechanism.

The upper lid main body 8 is composed of an upper lid lining material 9 and an upper lid frame 10 supporting the upper lid laying material 9 as essential elements, and has a shape corresponding to the slab opening 2. As the top cover material 9, a perforated plate such as expanded metal or perforated metal is suitable, but in some cases, a plate without any holes may be used. When a perforated plate is used, a display plate such as an ABS resin plate on which an opening display (for example, width / length / thickness) is printed can be attached to the lower surface of the upper cover sheet material 9, if desired. A reinforcing upper lid receiving frame 14 is attached to the lower surface of the upper lid laying material 9 if necessary. When the upper lid body 8 is closed, it is normally supported by the lower frame 12 fixed to the outer frame 3 at a predetermined height. However, lower frame 1
Part of 2 (for example, other than the one to which the fastener 11 is attached)
Alternatively, all of them may be integrated with the upper lid body 8.
The upper lid body 8 is attached to the outer frame 3 with or without a suitable metal fitting, but is rotatably supported by the outer frame 3 by an appropriate means so that the slab opening 2 can be opened and closed. It must be. In FIG. 1, the hinge 11 is illustrated as a rotatable shaft support means, but the invention is not limited to this. The upper lid main body 8 is held at a predetermined angle by the upper lid support bar 13 when the slab opening 2 is opened.

Further referring to FIG. 4, FIG. 4 (a) is a plan view showing a state in which the upper lid main body 8 is closed and the upper lid supporting bar 13 is housed, and FIG. 4 (b) is a side view. The upper lid support bar 13 has a basic shape of L-shape or roughly L-shape, one end of which serves as a stop end 16 for preventing displacement, and a stopper 17 is fixed to the other end by welding or the like.

To provide the stop 16 the upper lid support bar 1
One end of 3 may be tapped out, or a stopper having an appropriate shape such as a rod shape or a plate shape may be fixed. When the upper lid main body 8 is closed, the stopper frame 16 side of the upper lid support bar 13 has the outer frame 3
Groove 18 provided on the upper cover frame 10 and notch groove 19 provided on the upper lid frame 10
The stopper end 16 is inserted into the inside of the upper lid frame 10. In addition, the stopper 17 of the upper lid support bar 13
The side is passed through a hole provided in the outer frame 3 and the stopper 17 is positioned between the outer frame 3 and the upper lid frame 10, so that the side is supported by the outer frame 3 so as to be vertically rotatable.

Referring to FIGS. 1 and 4, the upper lid body 8
1 is held in the open state, the upper cover lining material 9 is rotated in the direction A of FIG. 1 to stand up separately from the upper cover support bar 13, and the upper cover support bar 13 is also rotated in the same direction to support the upper cover. The bar 13 is inserted into a notch groove provided at a proper position and held at a predetermined angle. The angle does not necessarily have to be a right angle with respect to the plane of the slab, and when it is easy to fall, adjust the position, angle, length, etc. of the notch groove so that the top cover material 9 is placed outside (left side in FIG. 1). ) May be defeated a little.

The protective cover of the present invention can be continuously arranged in the longitudinal direction of the slab opening.

Although the description has been given based on the case where the slab opening is a square, the protective lid of the present invention is not limited to a square,
A slab opening of any shape such as circular or irregular can be applied.

[0017]

The protective lid of the present invention having the above-mentioned structure has the following effects.

(1) Since it can be freely attached to and detached from the slab opening, it can be used repeatedly, and therefore it is economical to use a material having sufficient structural strength.

(2) Since it can be used repeatedly,
Even if a plurality of protective covers corresponding to the size and shape of the slab opening are prepared in advance, the economical burden is small.

(3) Since the attachment / detachment operation is easy and has sufficient safety, there is no fear of impeding the progress of construction work.

(4) Since it has sufficient safety, there is no possibility of causing a serious problem even if care is taken to restore the cover of the slab opening.

[Brief description of drawings]

FIG. 1 is a side sectional view illustrating a state in which a protective lid of the present invention is attached to a slab opening.

FIG. 2 is a plan view of an example of the protective lid of the present invention.

FIG. 3 is a side sectional view (a) and a front view (b) of an example of a fixing member used for the protective lid of the present invention.

FIG. 4 is a plan view (a) and a side view (b) illustrating a state in which an upper lid support bar used for the protective lid of the present invention is housed.

[Explanation of symbols]

 1 Slab 2 Slab Opening 3 Outer Frame 4 Fixed Hardware 5 Slide Hardware 6 Clamping Tool 7 Clamping Tool 8 Top Lid Main Body 9 Top Lid Material 10 Top Lid Frame 11 Shaft Support 12 Lower Frame 13 Top Lid Support Bar 14 Floor Material Receiving Frame 15 Vertical Hole 16 Stop end 17 Stopper 18 Groove 19 Notch groove

Claims (1)

[Claims] 1. A protective cover for an opening of a slab, comprising an outer frame placed around the opening of the slab, a fixing member composed of a fixed metal object and a slide metal object, an upper lid body that can be opened and closed, and an upper lid support bar. The outer frame has a shape corresponding to the opening of the slab, the fixed hardware is respectful to the outer frame, and the slide hardware engages with the fixed hardware slidably in the thickness direction of the slab. Therefore, the protective lid is detachably fixed to the slab opening by the fixing member, the upper lid main body has a shape corresponding to the slab opening, and is rotatably supported by the outer frame. Is a protective cover for the slab opening, which is detachably engageable with the upper cover body and can hold it at a predetermined angle.