JPS6020665Y2 - Manhole foothold mounting structure - Google Patents

Description

[Detailed description of the invention] The present invention relates to a foothold fitting to be attached to a manhole for use in sewerage works, etc., and in particular simplifies the manufacture of the manhole side block, as well as securely and safely attaching the foothold fitting. This invention relates to a manhole foothold mounting structure configured to obtain the following.

Conventionally, to attach a foothold to the side block of a manhole,
As shown in Figures 1 to 3, the foothold fittings 11 are embedded in the side mass of the manhole 10 in a staggered manner or in the vertical direction, so that the foothold fittings 11 are set in the concrete formwork. This method involves pouring concrete into molds and removing the mold after curing.The structure of the concrete formwork is extremely complex, requiring a great deal of labor to assemble and demold, and requires a lot of work time, resulting in low productivity. It also had drawbacks such as high cost.

The present invention was made in order to solve the above-mentioned drawbacks of the conventional structure, and when manufacturing the manhole side block using concrete formwork, a mounting hole that penetrates the side block is installed in advance at the position where the foothold fittings will be attached. To provide a foothold mounting structure for a manhole with the purpose of improving productivity by making a hole in the hole and easily attaching a separately manufactured foothold fitting.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 4 to 8.

Figure 4 A9 is a sectional view of the manhole side block 1 according to the present invention, and when forming the bottom using concrete formwork, a mounting hole is made through the side block at a position where the foot hook 2 is installed in advance. 1a is formed.

At this time, a counterbore portion 1b may be formed outside the attachment hole 1a.

Figure 5 A9 is a top view and a side view showing the mounting part of the footrest 2 according to the present invention, and the leg part 2a is shaped like a round bar or the like.
A wedge hole 2b into which the wedge 3 is driven is bored at the end of the hole.

Further, a stopper washer 4 is fixed to the leg portion 2a of the foothold fitting 2 by welding or the like at a distance corresponding to the thickness of the manhole side block 1 from the inner end of the wedge hole 2b,
The positioning is performed when the leg portion 2a is inserted into the attachment hole 1a of the manhole side block 1.

Therefore, when attaching the foothold fitting 2 to the manhole side block 1 having the bottom shape as described above, as shown in FIG.
The leg part 2a is inserted, a water stop gasket 5 and a washer 6 are fitted from the outside of the manhole side mass 1, and a wedge 3 is driven into the wedge hole 2b of the leg part 2a from above to secure it.

After the wedge 3 is driven in, filling the surrounding area with mortar, patch, etc. will make it more securely fixed.

FIGS. 7 to 8 show other embodiments of the present invention,
This figure shows a state in which a bar-shaped step 9 is attached to the manhole side blocks 7 and 8, and the shape of the manhole side blocks may be different without departing from the spirit of the present invention.

As explained in detail above, the manhole footrest mounting structure according to the present invention does not require complicated formwork to manufacture the manhole side block, which simplifies the process, and facilitates the positioning and installation of the foothold fittings. Productivity is improved and manufacturing can be done at low cost.

Furthermore, since the foothold fittings are fixed and protrude to the outside of the manhole side mass, safety and reliability are high, and there are no accidents such as breakage of the foothold fittings, so that the foothold fittings can be used with confidence.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional manhole side block, Fig. 2 is a plan view showing the arrangement of the first foothold fitting, and Fig. 3 is a sectional view of a main part of a manhole side block showing another conventional embodiment. Fig. 4 A9 is a half sectional view of the manhole side mass according to the present invention, Fig. 5
Figure A9 is a top view and side view showing the main parts of the foothold fitting according to the present invention, Figure 6 is a sectional view of the main part showing the state of attachment of the foothold fitting to the manhole side mass according to the invention, and Fig. 7 8 through 8 are perspective views and sectional views of essential parts showing other embodiments of the present invention. 1... Manhole side block, 2... Leg hook, 2a... Leg, 2b... Wedge hole, 3... Besabi , 4...stopper washer,
5...Water stop gasket, 6...Washer.

Claims (1)

[Scope of utility model registration request] A mounting hole is drilled through the side block at the footrest attachment position of the manhole side block, and a wedge hole is drilled at the leg end of the foothold fitting for the mounting hole of the manhole side block. Insert a foothold fitting with a stopper washer welded to the hole at a predetermined distance from the inside of the side block, insert a water-stop washer from the end of the foothold fitting, and insert it into the wedge hole. A manhole foothold mounting structure characterized by being fixed by driving a wedge into it.