JPH0623155Y2 - Fall prevention hardware for iron lids for hand holes - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a fall prevention metal fitting for an iron lid for a handhole.

[Conventional technology]

There are circular and rectangular handholes provided for underground cable piping, etc., but a lid frame is embedded in the opening to the ground, and an iron lid is fitted to this lid frame.

This iron lid is often an iron lid in which an opening / closing key having a handle is inserted into the engagement hole and pulled up by the opening / closing key.

[Problems to be solved by the device]

Recently, with such iron lids for hand holes, there is an accident that the iron lids fall into the hand holes when opening and closing.

The cause is that there are obstacles such as guardrails on the iron lid, and it is impossible to open and close the lid in the correct posture.

When the iron lid falls into the handhole in this way, it hits the internal cable and breaks, leading to a failure accident.

In consideration of the above-mentioned circumstances, the present invention provides a wire mesh fall prevention wire mesh for a handhole that can prevent a cable from accidentally hitting a cable even if the iron lid is dropped and is lightweight. is there.

[Means for Solving the Problems]

In order to achieve the above object, the present invention forms a portal frame by combining a vertical flat plate having a notch for engaging a hook bolt in a handhole at the lower end with a horizontal flat plate orthogonal to the upper end thereof. The mold frames are arranged in parallel at intervals, and a plurality of horizontal bars are provided in parallel so as to penetrate the horizontal flat plate of the gate type frame by projecting the end portions thereof to the outside of the gate type frame. It is what

[Action]

The fall-prevention hardware of the present invention is set below the lid frame in the handhole by engaging the notch at the lower end of the vertical plate forming the gate frame with the hook bolt in the handhole.

Then, a lattice-shaped shelf is formed by the horizontal flat plate and a horizontal bar combined so as to penetrate the horizontal flat plate, which is located immediately below the lid frame as an inner lid and horizontally closes the inside of the handhole.
Even if the iron lid falls, it stops at this part and does not fall to the bottom of the cable.

Further, since the fall-prevention hardware of the present invention does not visually block the inside of the handhole, it does not cause any obstacle in observing the inside of the handhole from the ground with the iron lid open.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a vertical side view showing an embodiment of a fall prevention metal fitting for a handhole iron lid of the present invention, FIG. 2 is a perspective view of the same as above, in which 1 is a rectangular handhole and 2 is this handhole 1. A lid frame 3 to be embedded in the opening of is an iron lid fitted in the lid frame 2.

Further, a hook bolt 4 is provided below the lid frame 2 in the handhole 1.

As shown in FIGS. 2 and 3, the fall prevention metal fitting of the present invention includes vertical flat plates 6 and 6'having notches 5 and 5'for engaging hook bolts 4 in the handhole 1 as shown in FIGS. The portal frame 8 is formed by a combination of the vertical horizontal plates 7 orthogonal to the upper ends of the vertical plates 6 and 6 '.

Further, the gate-shaped frames 8 and 8 are arranged in parallel at intervals, the horizontal bar 9 made of round steel is passed through the horizontal flat plate 7 of the gate-shaped frames 8 and 8, and the end portion of the horizontal bar 9 is The gate-shaped frames 8 and 8 were projected outside. A plurality of horizontal bars 9 (two in the drawing) are provided in parallel.

Further, a horizontal flat plate 10 is provided in parallel with the horizontal flat plate 7 and at the same length so that the horizontal bar 9 penetrates in the central portion of the horizontal bar 9, that is, in the middle of the gate-shaped frames 8 and 8.

As shown in FIG. 3, the horizontal flat plate 7 or the horizontal flat plate 10 is connected to the horizontal bar 9 by forming a through hole on the horizontal flat plate 7 or 10 side and inserting the horizontal bar 9 through the through hole. , Fillet welding 13 should be applied.

Further, the vertical flat plates 6 and 6'and the horizontal flat plate 7 are joined together by fillet welding 13.

FIG. 4 is a plan view showing the state in which the fall-prevention metal fitting of the present invention is set in the handhole 1. The cutouts 5, 5'at the lower ends of the vertical flat plates 6, 6'forming the gate-shaped frames 8, 8. Is engaged with the hook bolt 4 in the handhole 1, a horizontal plate 7 and 10 and a horizontal bar 9 combined so as to penetrate the plate form a lattice-shaped shelf, which serves as an inner lid. It is located directly below the frame 2 and horizontally closes the inside of the handhole 1.

In the figure, 11 is a cable rack provided in the handhole 1, 12
Are fiber cables supported on the cable rack 11, which are located below the fence constituted by the horizontal flat plates 7 and 10 and the horizontal bar 9.

In this way, by setting the fall prevention hardware of the present invention in the handhole 1 and then fitting the iron lid 3 into the lid frame 2, even if the iron lid 3 falls into the handhole 1, the fence It stops at the part of and does not fall under the cable 12.

Although the horizontal flat plate 10 is provided in the above embodiment, it may be omitted depending on the size of the handhole 1,
Further, the number of gate-shaped frames 8 and horizontal bars 9 may be increased.

Further, the present invention can be similarly applied even if the handhole 1 is a so-called manhole having a larger size.

[Effect of device]

As described above, the fall prevention metal fitting for the iron lid for a handhole according to the present invention can prevent the cable from hitting the cable and causing an accident even if the iron lid is dropped.

Furthermore, the whole is lightweight and easy to handle, and it can be attached and detached simply and quickly by engaging and disengaging the notches with hook bolts in the handhole.

Further, even if the fall-prevention hardware is provided in the handhole, it will not be blocked visually, so that there is no obstacle to viewing the inside of the handhole from the ground with the iron lid open.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a fall prevention metal fitting for a handhole iron lid of the present invention, FIG. 2 is a perspective view of the same, and FIG.
The figure is a perspective view of a main part of the same as above, and FIG. 4 is a plan view of the same as above. 1 ... Hand hole, 2 ... Lid frame 3 ... Iron lid, 4 ... Hook bolt 5, 5 '... Notch, 6, 6' ... Vertical flat plate 7 ... Horizontal flat plate, 8 ... Gate frame 9 ... Horizontal bar, 10 ... Horizontal flat plate 11 ... Cable rack, 12 ... Cable 13 ... Fillet weld

Claims (1)

[Scope of utility model registration request] 1. A gate-shaped frame is formed by combining a vertical flat plate having a notch formed at its lower end to engage with a hook bolt in a handhole and a horizontal flat plate orthogonal to its upper end, and the gate-shaped frame is spaced at intervals. Existing in parallel with each other, and a plurality of horizontal bars are provided in parallel so as to penetrate the horizontal flat plate of the gate-shaped frame, with the end portions thereof protruding outside the gate-shaped frame. Iron lid fall prevention hardware.