JPH0612057Y2 - Mounting structure for iron cover for manhole - Google Patents

Description

[Detailed Description of the Invention] "Object of Invention" (Industrial Application Field) This invention relates to a mounting structure for a manhole iron cover.

(Prior Art) As a structure for attaching a manhole iron lid to a frame horizontally fixed on a road surface in a watertight manner, for example, as shown in FIG. 4, a packing 3 is interposed between the frame 1 and the iron lid 2. It is known that the bolt 4 is inserted into the hole formed in the iron lid 2 and the opening provided in the frame 1 and is screwed with the nut 5 welded to the frame 1 in advance. . However, in the case of such a structure, when the threaded portion of the nut 5 is damaged, it is necessary to remove the nut and newly weld the nut. As another known means, as shown in FIG. 5, a block 8 which is loosely fitted to a horizontal pin 7 and fixed to a frame 1 is screwed with a gutter bolt 4 into a screw hole to join an iron lid 2. There is a means. However, even in this case, when the block 8 is damaged, the horizontal pin 7 needs to be removed from the frame 1 and replaced.

(Problems to be Solved by the Invention) In the example of FIG. 4 described above, when welding for replacement due to damage to the nut requires time and work, the welding position of the nut is displaced. Has a drawback that the bolt 5 cannot be inserted, and in the example of FIG. 5, it is easy to remove the pin horizontally inserted under the road surface to the outside, as can be understood from the drawing. is not.

The present invention was devised in view of such a situation as described above, and can be easily replaced if the mounting bracket is damaged,
Even if the iron lid is slightly displaced from the regular position and fitted into the frame, there is some play at the position of the bolt, and it is therefore an object of the present invention to provide a mounting structure that facilitates a watertight connection. .

[Constitution of Device] (Means for Solving the Problem) In order to achieve the above-mentioned object, the inventors of the present invention have proposed that a plurality of portions of the frame body have recesses at the bottom and a pair of protrusions at the top. To form a space portion, and insert the T-shaped bolt with the leg part facing upward between the overhanging parts, and further insert the support fitting to fix the T-shaped bolt, and dispose on the iron lid. The above-mentioned T
An attachment structure for a manhole iron cover, characterized in that the V-shaped bolts are made to protrude and are joined by a nut.

To provide.

(Operation) The present invention requires a frame body to which an iron lid is coupled, and a space portion having a special shape for receiving and positioning a metal fitting for locking the iron lid is formed on the frame body, It is composed of a T-shaped bolt and a nut for connecting the iron lid and the frame, a support fitting for fixing the T-shaped bolt in a predetermined position, and the iron lid.

First, to describe the shape of the space portion of the frame body, the frame body has a recessed portion in the lower portion, and in the upper portion thereof a pair that horizontally protrudes with a space slightly wider than the diameter of the leg portion of the iron lid tightening bolt is formed. Form the overhang. The size of the recessed portion under the overhanging portion must be such that the horizontal portion of the T-shaped bolt fits laterally along the peripheral edge of the frame body, and it is perpendicular to the tip of the overhanging portion. It is necessary to make the size such that the horizontal part of the T-shaped bolt enters inside from the grated line.

Next, the T-bolt will be described. With the leg part facing upward, in the middle of the pair of overhang parts described above, the horizontal part is laid sideways into the recessed part, and it is connected to the iron lid with a nut described later. Therefore, the leg portion needs to have a predetermined length and the screw portion needs to be formed in advance. Even if the legs are simply placed in the middle of the overhanging part with the legs upside, the support fitting is inserted into the space between the overhanging part and the outer frame of the frame because it is unstable and easily falls from the notch. It is sufficient that the width of the support fitting is equal to or smaller than the recessed portion provided in the frame body, and it is necessary to fulfill the role of preventing the leg portion of the T-shaped bolt from falling. The height is about the same as that of the overhanging portion described above, and a length for holding the T-shaped bolt upright is necessary.

It should be noted that it is convenient for insertion or removal if the upper part of this support fitting is provided with a work corresponding to a handle or a hook. The nut for screwing the iron lid by screwing with the tip of the leg portion of the T-shaped bolt is not particularly limited in terms of strength, but it is preferable to use a cap nut in terms of safety and corrosion resistance.

In order to firmly connect the iron lid to the frame, it is necessary to tighten the bolts at least at two or more places, and usually 3 to
Four locations are preferred.

(Embodiment) FIG. 1 shows an embodiment of the present invention, and is a sectional view showing a structure in which an iron lid is attached to a manhole frame. In the space formed in the frame body 1 horizontally provided on the road, the T-shaped bolt 4 has the leg portion 4a facing upward, and the horizontal portion 4b faces downward,
It is illustrated that a pair of overhanging portions 1a provided on the frame body 1 is fitted upright and further, a supporting metal fitting 6 is inserted between the overhanging portion 1a and the outer frame 1b. This is T-bolt 4
Is stably fixed with the legs up. Then rubber O
After placing the ring 3 in the groove on the upper side of the frame, align the bolt hole of the iron lid 2 with the T-shaped bolt 4 and fit the iron lid 2 inside the outer frame 1b. Tighten the lid 2 in a watertight manner. This final tightening completes the mounting structure of the present invention.

FIG. 2 shows the mounting structure of the manhole iron cover of the present invention,
FIG. 2 is a plan view (cross-sectional view taken along the line AA of FIG. 1) at a position where a T-shaped bolt is inserted into the frame body and fixed with a support fitting.
The outer frame 1b is provided with a recessed portion in the lower portion, and the pair of overhanging portions
It is shown that the T-shaped bolt 4 having the leg portion 4a facing upward and the horizontal portion 4b facing downward is vertically fitted into the intermediate portion having a, and further fixed by the support fitting 6. Most of the horizontal portion 4b of the T-shaped bolt 4 is laterally fitted under the overhanging portion 1a, and its position is shown by a dotted line.
A handle 6a is provided at the center of the support fitting 6 for easy insertion and removal.

FIG. 3 shows a plan view in which an iron lid is connected to the frame body. In this embodiment, bolts are tightened at three places (one place is not shown).

[Advantages of the Invention] As described in detail above, in the case of the iron lid mounting structure according to the present invention, the T-shaped bolt is fitted into the concave portion having the pair of projecting portions formed in the frame, Is fixed with a support bracket, and the leg of the T-bolt is projected into the opening of the iron lid.
Since the structure is tightened with nuts, there is some allowance in the movement of the bolts, and it is easy to tighten the iron lid,
Even if the bolts are damaged, by removing the iron lid and then pulling out the support fittings, you can easily and quickly
Since the V-shaped bolts can be replaced, it can be said that this is an excellent idea as a mounting structure for a manhole iron cover.

[Brief description of drawings]

FIG. 1 is a sectional view showing an attachment structure of an iron lid for a manhole of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view of the present invention in which an iron lid is connected to a frame. Plan views and FIGS. 4 to 5 are sectional views showing a mounting structure of a known iron cover for manholes. 1: Frame 1a: Overhanging part 1b: Outer frame 2: Iron cover 3: Packing 4: T-shaped bolt 4a: Leg part, 4b: Horizontal part 5: Nut, 6: Support metal fittings 6a: Handle, 7 : Horizontal pin 8: Block

Claims (1)

[Scope of utility model registration request] 1. A frame portion is formed with a plurality of space portions having concave portions at a lower portion and a pair of protruding portions at an upper portion, and the leg portions are directed upward between the protruding portions. For a manhole, which is characterized in that a T-shaped bolt is fitted and inserted, a supporting metal fitting is further inserted to fix the T-shaped bolt, and the T-shaped bolt is projected into a through hole provided in an iron lid and coupled with a nut. Iron lid mounting structure.