JPS6020667Y2 - manhole cover - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a height adjustment mechanism for a manhole cover disposed at the open end of a manhole.

Conventionally, the height of a manhole cover disposed at the open end of a manhole was adjusted by inserting wedge pieces into the open end of the manhole and the lower surface of the manhole cover receiving frame.

However, this wedge piece has a drawback that the mounting position may shift over a long period of time due to repeated loads on the road surface that are applied to the manhole cover.

SUMMARY OF THE INVENTION An object of the present invention is to provide a manhole cover that eliminates the above-mentioned drawbacks by fixing the wedge piece used to adjust the height of the manhole cover.

An embodiment of this invention will be described based on the drawings.

First of all, Figure 1 shows a cross-sectional view of a manhole.
A receiving frame 3 for a manhole cover 2 is arranged at the opening end of the manhole 1, and a cover part 4 is inserted into this receiving frame 3 to open the manhole 1.
The open end is closed.

The method of fixing the manhole 1 and the receiving frame 3 is to insert the bolt 5, which is set upright at the open end of the manhole 1, into the mounting part 8 of the receiving frame 3 and fix it with a nut 33. A mortar 6 is placed between the manhole M2 and the manhole M2.

Next, a method for fixing the wedge pieces 20 shown in FIGS. 2 and 3 will be described. Wedge insertion portions 10 are provided on the outer periphery of the peripheral wall 7 of the receiving frame 3 at every angle of 1200 degrees. In this case, vertical walls 11 and 12 are arranged facing each other on the mounting part 8 of the receiving frame 3, and a horizontal wall 13 is connected to the upper part of the vertical walls 11 and 12 to form a wedge insertion part 10 having an opening-shaped cross section. .

The inner surfaces of the vertical walls 11 and 12 are provided with uneven portions 15 and 16 that are inclined toward the center of the receiving frame 3.
A bolt insertion hole 14 is provided in the center of the horizontal wall 13, and an uneven portion 17 is provided around the upper surface of the bolt insertion hole 14 in the horizontal wall 13.

The wedge piece 20 inserted into the wedge insertion part 10 has uneven parts 21 and 22 on both sides thereof inclined to the right (see Fig. 2), and a U in the center into which the bolt 5 is inserted. A glyph-shaped groove 23 is provided.

When installing the manhole cover 2 at the open end of the manhole 1, the bolt insertion hole 14 of the wedge insertion part 10 of the receiving frame 3 is inserted into the bolt 5 installed upright from the manhole 1. Insert the wedge piece 20 into the wedge insertion part 10.

In this case, the rough height adjustment of the receiving frame 3 is performed at the meshing position between the concavo-convex portion 21.22 of the wedge piece 20 and the concave-convex portion 15.16 of the wedge insertion portion 10.

Further, fine adjustment of the height of the receiving frame 3 is performed by adjusting the amount by which the wedge piece 20 moves toward the center of the receiving frame 3.

When the height adjustment of the receiving frame 3 is completed, an L-shaped locking tool 30 is installed on the bolt 5 protruding from the upper surface of the wedge insertion part 10,
In this case, an uneven portion 24 is provided on the lower surface of the L-shaped locking tool 30 and engages with an uneven portion 17 of the horizontal wall 13.

The locking piece 31 of the L-shaped locking tool 30 locks the rear portion of the wedge piece 20 to prevent the wedge piece 20 from coming off from the wedge insertion portion 10.

The locking position of the locking piece 31 is determined by adjusting the engagement position between the uneven portion 17 of the horizontal wall 13 and the uneven portion 34 of the L-shaped locking device 30.

Furthermore, a rotation stopper washer 32 is inserted into the bolt 5 and fixed with a nut 33.

After the height adjustment of the receiving frame 3 is completed, mortar 6 is filled between the mounting portion 8 of the receiving frame 3 and the open end of the manhole 1 to fill the gap.

Since this device is constructed as claimed in the utility model registration based on the above-described embodiment, it is possible to securely hold the wedge piece inserted between the manhole cover and the opening end surface of the manhole. became.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the manhole, FIG. 2 is a sectional view of the wedge insertion portion of the manhole cover, and FIG. 3 is a side view of the wedge insertion portion of the manhole cover. 1 - Manhole, 2 - Manhole cover, 3 - Receiver frame, 4 - Lid, 5 - Bolt, 6 - Mortar, 10 - Wedge insertion part, 11
．． 12~Vertical wall, 13~Horizontal wall, 15.16,17,21
, 22, 34 ~ uneven portion, 20 ~ wedge piece, 23 ~ U-shaped groove,
30 ~ L-shaped locking tool, 32 ~ rotation stop washer 33
~Natsuto.

Claims (1)

[Scope of utility model registration request] The manhole cover includes a wedge insertion part with a cross-section shape provided on the outer periphery of the receiving frame, an uneven part provided on the upper surface of the wedge insertion part, and a wedge piece inserted into the wedge insertion part. , an L-shaped lock having a concave and convex portion on the lower surface that engages with the concave and convex portion of the wedge insertion portion, and is pressed and disposed with a nut screwed onto a bolt protruding from a manhole that locks the rear end of the wedge piece; A manhole cover with a stopper and a guard.