JP3241833B2 - Floor inspection port lid device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover for an inspection port provided on a floor of a building or the like.

[0002]

2. Description of the Related Art Electric wires, communication cables, water and sewage pipes, gas pipes, water supply and drain pipes for cooling and heating, and the like are provided under the floor of a building or the like, and various meters and valves attached to these are opened on the floor. A floor inspection port lid device is used to cover the inspection port with a cover.

[0003] Such a floor inspection opening lid device is formed in a shallow-bottom box shape having an open top surface, the inside of which is filled with the same floor material as the surrounding floor, and the top surface of which is finished, and an opening on the floor. A receiving frame having an L-shaped cross section fixed to the inner peripheral surface of the inspection port, and the lid fitted to the receiving frame is supported by the horizontal edge of the receiving frame having the L-shaped cross section. It is configured so that it can be detachably attached to the inspection opening at the same height as the floor surface.

[0004]

Incidentally, in a general fire-resistant building, in order to prevent the fire from spreading inside the building in the event of a fire, it is necessary to provide a fire-prevention section with a floor, wall or fire door of a fire-resistant structure for each fixed area. Regulated by law. Therefore, it is preferable that the floor inspection port cover device installed on the floor constituting the fire protection compartment also has fire resistance matching the fire resistance structure of the floor. Because there is no legal regulation on performance, there has been no fire-resistant floor inspection port lid device, and its development and spread have been demanded. The present invention has been made in order to meet such a demand, and an object of the present invention is to provide a fireproof type floor inspection opening cover device.

[0005]

According to the present invention, there is provided a rising edge portion provided on an inner peripheral surface of a floor opening, and a lid support projecting inward at right angles from a lower edge of the rising edge portion. In a floor inspection opening cover device including a receiving frame composed of a side portion and a lid attached to the receiving frame and supported by the lid receiving side portion, a double structure in which the lid is vertically divided And a fire-resistant layer formed by holding a fire-resistant material by a bottom frame below the main lid layer that shields the floor opening. In such a configuration, a refractory sheet may be fixed on the lid receiving side of the receiving frame, and the refractory sheet may be interposed between the lid receiving side and the lid.

[0006]

The fire resistance is imparted to the floor inspection opening cover device by the heat insulating and non-flammable effects of the fireproof layer disposed in the lower portion of the lid. Further, by interposing a fireproof sheet between the lid receiving side portion and the lid, the fire resistance can be further improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. Reference numeral 1 denotes a rectangular opening which is opened on the floor 2 as an inspection port, and the receiving frame 4 of the floor inspection port cover device 3 according to the present invention is disposed in the opening 1. The receiving frame 4 includes a rectangular rising edge 5 provided on the inner peripheral surface of the opening 1, and a lid receiving edge 6 projecting inward at right angles from the lower edge of the rising edge 5. Thus, a fireproof sheet 7 is fixed to the upper surface of the lid receiving side portion 6. As the material of the refractory sheet 7, for example, a sheet material formed by mixing ceramic fibers having excellent heat resistance and high-strength glass fibers in a felt shape is used.

On the other hand, the lid 8 of the floor inspection opening lid device 3 fitted to the receiving frame 4 is a main lid frame 9a formed in a shallow box shape with an upper surface opened by a peripheral side plate 10 and an intermediate bottom plate 11.
And a bottom frame 9 fixed to a lower portion of the main lid frame 9a.
b to form a double structure divided up and down.
The main lid layer 13 is formed in the main lid frame 9a by filling the same floor material 12 such as mortar as the floor 2 around the opening 1, while the main frame 9b is previously filled in the bottom frame 9b. The refractory material 14 forms the refractory layer 14. The refractory material 20 forming the refractory layer 14 is lightweight, high-strength, heat-insulating and non-flammable, such as calcium silicate plate. Then, the lid 8 is fitted into the receiving frame 4, and the bottom of the lid 8 is supported on the lid receiving side portion 6 of the receiving frame 4 via the refractory sheet 7, thereby forming the lid 8.
Is provided so as to be detachably attached to the opening 1 at the same height as the floor surface 2.

A fixing bolt 15 is inserted into each corner of the lid 8 from above, and a lower end of the fixing bolt 15 is screwed to a cap nut 16 fixed to the lower surface of the lid receiving side portion 6. The lid 8 is prevented from coming off the receiving frame 4.
A plug 19 for closing the insertion hole 17 is screwed into a corner plate 18 provided above the insertion hole 17 of the fixing bolt 15, and this plug hole engages a tool when the cover 8 is removed from the receiving frame 4. It is also used as a mating hole.

In such a configuration, the midsole plate 11 which partitions the inside of the lid 8 up and down becomes a partition wall between the main lid layer 13 and the refractory layer 14, and when the floor material 12 such as mortar is filled, the mortar or the like is used. Has a sealing effect to prevent the material from penetrating into the refractory material 20 made of calcium silicate plate or the like, while the refractory material 20 does not collapse even when a load such as a person or a heavy object is applied from above when the lid 8 is used. Thus, a reinforcing effect can be obtained.

In the first embodiment, the peripheral side plate 1
Main lid frame 9 formed integrally with the inner bottom plate 11
Although the bottom frame 9b is fixed to the lower part of the frame a, the lid 8 has a double structure. However, the present invention is not limited to this, and as in the second embodiment shown in FIG. 9
A peripheral plate 10 'is integrally connected to the upper edge of b' to form a lid 8 '.
And a double structure can be obtained by arranging the midsole plate 11 'in the middle of the lid 8'.

[0012]

According to the present invention, as described above, since the fireproof layer is provided at the lower portion in the lid, the fireproof property is imparted to the floor inspection opening cover device by the heat insulating action and the non-flammable action of the fireproof layer. This has made it possible to obtain a fire-resistant floor inspection port lid device.

Further, by interposing a refractory sheet between the lid receiving side portion and the lid, the refractory sheet provides a buffering effect, and the fire resistance can be further improved. Has an effect.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a state in which a lid according to a first embodiment is attached.

FIG. 2 is a plan view of the same.

FIG. 3 is a longitudinal sectional side view of a main part of a lid according to a second embodiment.

[Description of Signs] 1 Opening 3 Cover device for floor inspection opening 4 Receiving frame 5 Rising edge 6 Cover receiving edge 7 Fireproof sheet 8 Lid 9a Main lid frame 9b Bottom frame 10 Peripheral side plate 11 Middle bottom plate 12 Floor material 13 Main Lid layer 14 Fireproof layer 20 Fireproof material

Claims (2)

(57) [Claims] 1. A receiving frame comprising: a rising edge portion provided on an inner peripheral surface of a floor opening; and a lid receiving edge portion projecting inward at right angles from a lower edge of the rising edge portion. A lid device for a floor inspection opening, comprising a lid attached to the receiving frame and supported on the lid receiving side portion, wherein the lid has a double structure divided into upper and lower parts, and a floor opening is shielded. A floor inspection opening lid device, wherein a fire-resistant layer formed by holding a fire-resistant material by a bottom frame is disposed below the main lid layer. 2. The floor inspection according to claim 1, wherein a refractory sheet is fixed on the lid receiving side of the receiving frame, and the refractory sheet is interposed between the lid receiving side and the lid. Mouth lid device.