JPS6017904B2 - Lid for underground structures with fall prevention mechanism - Google Patents

Description

[Detailed Description of the Invention] Conventionally, vertical holes such as manholes are provided with a cover for the vertical hole such as a manhole consisting of a receiving frame and a cover at the opening of the vertical hole such as a manhole on the ground surface, and a cover for the vertical hole such as a manhole consisting of a receiving frame and a cover is provided on the wall of the vertical hole such as a manhole below the cover. Scaffolding fittings for raising and lowering personnel were installed at predetermined intervals.

As a result, there is no object to put your hands and feet on until you raise the cover of a vertical hole such as a manhole and place your feet on the scaffolding fittings from the ground surface, making it dangerous to go up and down. Alternatively, a separate ladder was prepared specifically for entering and exiting from the vertical hole such as a manhole, and the ladder was fixed to the vertical hole such as a manhole and used to ascend and descend in a pillow position. In that case, there is the hassle of preparing a separate ladder for access and transporting it to the entrance of a manhole or other vertical hole at the site, and it is a labor-intensive task to fix the ladder upright at the entrance of a vertical hole such as a manhole. There was a risk that personnel could fall and cause an accident when closing the bridge. In addition, an invention described in Japanese Utility Model Publication No. 141767 is known as a manhole whose cover has a ladder mechanism, but in this, a lattice-like cover provided on the floor part halfway through the manhole is placed in an upright position. - It is used as a ladder by being attached to the fishing village on the inner wall of the block on the side of the building. However, this invention cannot be used as a lid installed at the ground surface entrance of a vertical hole such as a manhole because the nishikimura that holds the lid upright cannot be installed above the ground surface, and the lid itself becomes a ladder. There is a drawback that when the lid is placed in the upright position or when the lid is placed in the upright position, it is dangerous for the operator or large working tools to fall. The present invention aims to provide a practical lid for underground structures with a fall prevention mechanism that eliminates these drawbacks.

The gist of the present invention is that, in an underground structure cover installed at the ground surface entrance of a vertical hole such as a manhole, the base end of the ladder, which is shorter than the cover diameter of the underground structure cover, is placed around the lower part of the inner circumferential wall of the receiving frame. A receiving part for supporting the free end of the ladder is provided on the lower part of the inner circumferential wall of the receiving frame, and an auxiliary branch for standing upright is fixed on the base end of the ladder, and the ladder can be mounted upright on the inner circumferential wall of the receiving frame. The lid for an underground structure with a fall prevention mechanism is characterized in that it has an opening into which the punch end of the auxiliary punch is inserted in the above-mentioned state.

Here, the lid for underground structures with fall prevention mechanism of the present invention is:
This term refers to underground structures used to close vertical holes on the ground surface, such as water supply and sewerage covers, power and telecommunication covers, gas manholes, and other underground structures. However, it is not limited to this. Further, the mechanism for locking the proximal end of the ladder to the lower inner circumference of the receiving frame in a freely extending manner is not limited to the embodiment shown in the drawings, and any mechanism may be used as long as it does not easily come off in an upright or horizontal position. Examples will be described below based on the drawings.

First Embodiment (See Figures 1 to 5) In the first embodiment shown in Figures 1 to 5, the ladder is made rotatable by a locking punch, and an auxiliary support is provided in a circular through hole provided in a shelf board on the inner circumferential wall of the receiving frame. This is an example of iron-cladding the edge of a village.

In the figure, 1 is a ladder, 2 and 2' are the main pillars of the ladder, 3 and 3' are auxiliary punches for standing upright, 4 is a receiving frame, 5 and 5' are through holes, and 6 is the bent tip of the main pillar. 7 is a manhole, 8 is a step on ladder 1,
9 and 9' are bent parts provided at the lower ends of the main pillars 2 and 2', and the same bends. 11 is a bolt receiving part for fixing the locking punch to the receiving frame 4 at both ends; 12 is a bolt; 13 is a receiving frame 4;
A shelf board provided on the inner peripheral wall, 14 a manhole cover, 15 a locking punch, and 16 a bolt for fixing the second stopper 15 to the inner wall of the receiving frame.

Here, bend the ends of the main posts 2, 2' of the ladder 1, and
A receiving part is formed by providing a retaining village 15 etc. that engages with the bent part 6 on a part of the inner circumferential wall of the ladder 1, and the ladder 1 can be stopped by the receiving frame 4 in a horizontal state, thereby making it possible to close the manhole opening. It can be blocked off with Ladder 1 to prevent people from falling.

Furthermore, by placing silk on top of this ladder 1, tools such as spanners and small items can be prevented from falling. In this embodiment, when the manhole cover 14 is closed, the manhole opening is opened, and personnel are preparing to enter, the proximal bent portions 9 and 9' of the ladder 1 are inserted into the locking punch 10. The ladder 1 is rotatably locked to the lower inner circumference of the receiving frame 4, and the other end of the ladder 1, the tip side, is locked by a receiving mechanism of the bending part 6 and the locking punch 15, so that the ladder 1 is 1 is fixed in a substantially horizontal state inside the receiving frame 4, and can prevent personnel etc. from falling. When a person enters the manhole 7, the ladder 1 is attached to the proximal bent portion 9, which is locked to the receiving frame 4 side.
9' is rotated about the center of rotation to bring it into an upright position, and the punches of the auxiliary branches 3, 3' at the bottom of the main pillars 2, 2' are connected to the shelves 13 provided on the inner circumferential wall of the receiving frame 4. It is inserted into the through holes 5, 5', and is held upright by the two bridge support punches 3, 3' and the tips of the two main pillars 2, 2', and the person's own weight (
The structure is strong enough to support the load), and personnel can easily descend into the manhole 7 by placing their hands and feet on the rungs 8 of the upright ladder 1, and then step onto the scaffolding metal fittings 26 installed inside the manhole 7. You can descend safely by putting your hands and feet on the ground.

Second Embodiment (See Figures 6 and 7) The second embodiment shown in Figures 6 and 7 is an auxiliary punch 3 for standing the ladder 1
, 3' is made into a wide hook shape, and the auxiliary branch village 3
, 3' are inserted into the shelf openings 22 which are large on the left and right sides of the shelf board 13 protruding from the inner station of the receiving frame, rectangular frames 23 are formed on the left and right sides of the free end of the ladder 1, and the receiving frame 4 This is an example of a receiving part structure that supports the free end of the ladder 1 by inserting it into the fixed protrusion 24 provided in the ladder.

In the figure, 20 is a long hole for spinning provided at the tip of the auxiliary punches 3, 3', 21 is a horizontal punch constructed on the inner circumferential wall of the receiving frame 4, and 22 is a shelf plate 1.
3 is a pair of large shelf openings on the left and right, 23 is a ladder 1
A rectangular frame is formed on the left and right sides of the free end of the receiving frame 4, 24 is a fixed protrusion protruding from the inner periphery of the receiving frame 4, 25 is a manhole slanted wall, and 26 is a scaffolding metal fitting.

The other numbers are the same as those in the first embodiment. In this embodiment, the ladder 1 is rotatable around the elongated hole 20 penetrated by the horizontal punch 21, and when the manhole cover 14 is closed, the ladder 1 is moved as shown by the solid line in FIGS. 6 and 7. , the rectangular frame 2 at the free end of the ladder
3 is inserted into the fixed protrusion 24, and the ladder 1 is inserted into the horizontal punches 2 at both ends.
1 and a fixed projecting piece 24, and is held in a substantially horizontal state within the manhole opening.

When the manhole cover 14 is opened and a person enters the manhole 7, lift the free end side of the ladder 1, rotate it around the Isomura 21, and place the upright auxiliary branches 3, 3' of the ladder 1 on the shelf. In this example, the ladder 1 is inserted and locked into the shelf entrance part 22 of the plate 13, and the ladder 1 is held in an upright state, and the load and moment applied to the ladder 1 are supported by the shelf plate 13 of the engine entrance part 22 and the Yokomura 21. . In this embodiment, since the entrance area of the shelf closing part 22 is large, when people go up and down, regardless of the presence or absence of the ladder 1,
The user can move up and down by inserting his/her hand into the shelf opening 22 and grasping the shelf opening, thereby being able to move up and down safely and easily.

As described above, the present invention allows the ladder 1 to be stored in the underground structure cover itself, so that personnel do not need to prepare and transport a separate ladder, and when necessary, they can easily hold the ladder 1 in an upright position. Since it is assembled into the underground structure cover and is firmly supported by the receiving frame 4, it can be safely installed without falling down, and personnel can get down from the manhole cover 14 quickly, far and safely. In addition, until the underground structure cover is opened and the ladder is fixed upright, it is attached approximately horizontally to the support frame 4, so personnel, etc. are prevented from falling into the manhole at this stage, and the ladder can be safely accessed from the manhole opening. This has the effect of allowing you to go up and down from the ground. Furthermore, while personnel are working inside underground structures such as manholes,
The ladder can be locked in a horizontal position to prevent passersby from falling, and the ladder can be erected vertically to serve as a sign for construction work, etc., which can be used effectively.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the first embodiment of the lid for underground structures with a fall prevention mechanism of the present invention with the lid removed, Figure 2 is a side view showing a ladder, and Figure 3 is Figure 1 Fig. 4 is a view of the blindness seen from the line 1, Fig. 4 is a view taken from the 0-ro line in Fig. 1, Fig. 5 is an explanatory diagram showing the ladder of this embodiment in an upright state, Fig. 6 7 is a plan view showing the second embodiment, and FIG. 7 is a sectional view of the same embodiment. 1... Ladder, 2, 2'... Main post, 3.3'... Auxiliary punch, 4... Receiving frame, 5, 5'... Through hole, 6...
Bent part, 7... Manhole, 8... Foundation branch, 9,9'
...Bending part, 10... Locking punch, 11... Bolt receiving part,
12... Bolt, 13... Shelf board, 14... Manhole cover, 15... Locking pestle, 16... Bolt, 20...
...most hole, 21...horizontal punch, 22...tanasekiguchi part, 23...
- Rectangular frame, 24... Fixed projecting piece, 25... Manhole slanted wall, 26... Scaffolding metal fittings. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. For covers for underground structures that are installed at surface entrances and exits of vertical holes such as manholes, the base end of a ladder shorter than the cover diameter of the underground structure cover is rotatably attached to the lower part of the inner circumferential wall of the receiving frame. A receiving part for supporting the free end of the ladder is provided at the lower part of the other end of the inner peripheral wall, and an auxiliary support rod for uprighting is further fixed on the base end side of the ladder, and the auxiliary support rod is attached to the inner peripheral wall of the receiving frame when the ladder is in an upright state. A lid for an underground structure with a fall prevention mechanism, characterized by having an opening into which a rod end is inserted.