JP2593630B2 - Hole closing mechanism of lid for underground structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole closing mechanism for opening and closing a hook hole or a burl hole provided in a lid for an underground structure.

The "jig for opening the lid" referred to in the specification of the present application refers to a jig inserted into a burr hole formed by cutting out the outer peripheral edge of the lid main body, and a lid for slightly releasing the bite from the outer peripheral edge of the lid main body. It refers to a hand hook rod that is inserted into a hand hook hole opened on the center side of the main body to lift the lid main body. The term “cover for underground structures” refers to underground buried structures in sewers, large iron covers, manhole covers, sewage hood covers, and underground facility equipment in power and communications that block openings between underground structures and other facilities and the ground. As an openable and closable iron cover for power and underground cables, a power transmission iron cover, a power distribution iron cover, an underground conduit for water supply and gas, and a function as an open / close door connecting the auxiliary equipment to the ground. Fire hydrant lid, water control valve lid, gate valve lid.
General term for air valve lid, gas pipe lid, water meter lid, etc.

[0003]

2. Description of the Related Art Manholes and small pits for maintenance and management are provided at appropriate locations in underground structures such as water and sewage, electric power / communications, and gas, and cast iron or the like is provided above these. Underground structure lid is installed.

[0004] Such a cover for an underground structure normally functions as a part of a road surface in a closed state while the cover body is opened for maintenance and management work. For this reason, an opening such as a hand hook hole or a burl hole that penetrates from the front surface to the back surface is provided in the lid body for opening.

[0005] In a divided sewer system in which sewage and rainwater are separated and flow, it is indispensable from the viewpoint of the treatment capacity of a sewage treatment plant to prevent rainwater from entering a pipe for sewage. it is necessary to prevent the rainwater from the opening to enter immersion. In addition, we prevent invasion of earth and sand from opening and
It is also very important from the point of view of maintenance and inspection to avoid accumulation in manholes and blockage of openings.

As a countermeasure, for example, Japanese Utility Model Publication No. 61-5
As described in Japanese Patent Publication No. 407, a valve plate having a shape for closing a burl insertion hole is formed at one end, and a midway of an arm having a weight at the other end is pivotally supported on the lower surface of the lid body by a pivot pin. Conventionally, a hole opening / closing structure that includes a hole closing device and normally closes the burl insertion hole by its own weight has been widely used.

It is also effective to adopt the structure described in Japanese Patent Application No. 4-293432 filed by the applicant of the present invention. This is an improvement on the conventional structure in which the valve plate had to be made smaller in the radial direction in order to prevent the valve plate from colliding with the tapered fitting surface when the burl was inserted.

[0008]

Even in the hole closing structure of the prior application, opening the lid body with the valve plate pressed down with a burl is the same as the conventional structure. The same applies to the work procedure of turning the opened lid body around the hinge in a horizontal posture to open the entire receiving frame.

However, when the lid body is horizontally turned and placed on a road surface using a hook-shaped bar-shaped hand-cage rod or a T-shaped bar described in Utility Model Registration No. 1559108, If the reinforcing ribs formed on the back surface of the lid body are low, the lower end of the plug will protrude from the lower surface of the lid body, that is, the lower surface of the rib, and the lower end surface will hit the road surface. For this reason, there is a possibility that the obstruction plug may pinch the tip of the burl inserted from the burl hole with the back surface of the lid body. Therefore, in order to remove the crowbar, it is necessary to raise the lid body slightly above the road surface, which increases extra work.

The problem to be solved in the present invention is that, in a structure in which an opening is closed by an obturator, a quick operation of the obturator and a complete obstruction of the opening can be achieved, and the tip of the jig for opening the lid can be closed. In the state of engaging with the back surface of the lid body.
° When turning, the lid opening jig is easily removed from the opening of the lid main body.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a cover for an underground structure provided with an opening for inserting an opening jig in a lid body fitted into a receiving frame, wherein the opening is closed. Stopper and
A pressing block connected to the plug and pivotally supported on the lower surface of the lid body so as to be vertically swingable to bias the plug toward the opening side by its own weight; and a lower surface of the lid body. A holding rib formed at a position sandwiching the obturation plug and capable of vertically guiding the obstruction plug, wherein a tip end of a lid opening jig inserted into the opening is engaged with a back surface of the lid main body. The lower end of the plug does not protrude from the lower end of the retaining rib when they are combined.

[0012]

The jig for opening the lid is inserted into the opening, the plug is pushed down, and the tip of the jig for opening is engaged with the back surface of the lid body. When the lid is opened, the lower end of the holding rib protruding downward from the back surface of the lid body can be used as a seating surface.

At this time, when the protruding length of the holding rib is inserted to a depth at which the tip end of the jig for opening the cover is engaged with the back surface of the lid body and the closing plug is pushed down, the lower end of the closing plug becomes the holding rib. It is formed so as not to protrude from the lower end.

[0014]

1 is a longitudinal sectional view of an essential part showing an embodiment of a hole closing mechanism according to the present invention, FIG. 2 is a left side view of FIG. 1 excluding a receiving frame, and FIG. 3 is a bottom view of FIG. is there. In addition, FIG.
-It corresponds to a vertical cross section at the position of the arrow A.

As shown in FIG. 1, a lid body 2 is fitted and fixed to a receiving frame 1 having a tapered fitting surface 1a formed on the inner periphery.
The lid body 2 is connected to the receiving frame 1 by a hinge (not shown) provided at a portion radially opposed to the illustrated hole closing mechanism portion, and the hinge is used as a fulcrum to invert and revert in the vertical direction and the horizontal direction.
The cover can be opened by turning in the direction .

A burr hole (opening) 2a for inserting a burl (opening jig) is provided in the outer peripheral edge of the lid main body 2 by cutting out from the outer peripheral side. At a position sandwiching the hole 2a, a pair of holding ribs 3 are formed to protrude downward. Then, between these holding ribs 3, a closing plug 4 for closing the burl hole 2a and a pressing block 5 connected to the closing plug 4 are incorporated.

Each holding rib 3 has two guide slits 3a substantially parallel to the tapered fitting surface 1a of the receiving frame 1.
The books are opened in parallel with each other. Further, a holding hole 3b and a holding seat 3c for swingably connecting the pressing block 5 are provided in a portion where the holding rib 3 faces the center direction of the lid main body 2, respectively. Then, a stopper 3e is incorporated into the holding seat 3c by a bolt 3d.

In this embodiment, one holding rib 3 is provided with a holding hole 3b, and the other holding rib 3 is provided with a holding seat 3c. In this case, the stopper 3e may be incorporated.

The holding rib 3 protrudes from the lower surface of the lid main body 2 by an appropriate length, and its lower end is a seating surface 3f substantially parallel to the upper surface of the lid main body 2. When the lid is opened, the seating surface 3f comes into contact with the road surface, and the seating surface 3f
The length of the guide slit 3a is set so that the closing plug 4 can move in the up-down direction between the cover slit 2 and the back surface of the lid main body 2.

FIG. 4 is an exploded perspective view showing the plug 4 and the pressing block 5 and the members connecting them.

The obturator plug 4 has a valve body 4a at its upper end for entering the burl hole 2a and closing the same.
a abuts against the lower surface of the edge of the burl hole 2a on both side surfaces of the valve body 4a.
A contact portion 4e for stabilizing the closed state of the burl hole 2a due to the above is formed, and further, a connection seat 4b is formed vertically from the center of the lower surface of the valve body 4a. Two holes 4c are opened in the connection seat 4b in accordance with the intervals of the guide slits 3a provided in the holding rib 3, and the rods 6 can be inserted into these holes 4c. An oval connecting hole 4d substantially parallel to the upper surface of the valve body 4a is formed below the hole 4c, and the pin 7 can be inserted into the connecting hole 4d. When the burl tip b inserted into the burl hole 2a is engaged with the back surface of the lid body 1, the seating surface 3 of the holding rib 3
The height of the plug 4 is set so that the lower end of the plug 4 does not protrude from f.

The pressing block 5 is provided with a connection seat 4b of the plug 4
Are provided on the upper end side, and a weight portion 5b bent downward from the base end is formed. The weight portion 5b is integrally provided with pivot pins 5c at both ends of the upper end.

The closing plug 4 is connected to the arm 5a of the pressing block 5.
The connection seat 4b is inserted between the two, and the pin 7 is inserted in a state where the through hole 5d formed at the tip of the arm 5a and the connection hole 4d are aligned, whereby the connection is made to the pressing block 5.
At this time, the pin 7 is loosely fitted in the connecting hole 4d, so that the obstruction plug 4 and the pressing block 5 are bendably connected to each other, and are fitted and fixed in the through hole 5d to prevent the stopper from coming off.

As shown in FIG. 3, the closing plug 4 and the pressing block 5 integrated as described above are connected to the pivot pin 5 at one end.
c is inserted into the holding hole 3b of the holding rib 3, and the pivot pin 5c at the other end is incorporated into the holding seat 3c. The pivot pin 5c in the holding seat 3c is restrained by the stopper 3e and the bolt 3d, and is suspended below the lid main body 2. By passing the two rods 6 through the guide slit 3a and the holes 4c, the obstruction plug 4 is connected so as to be movable along the guide slit 3a. At this time, retaining rings 6a are provided at both ends of the rod 6 to prevent the rod 6 from coming off.

The closing plug 4 is provided with a pressing block 5 connected thereto.
Due to the weight of the valve, a moment for turning the arm 5a upward about the pivot pin 5c acts, and in a natural state, the valve 4a enters the burl hole 2a and completely closes it as shown in FIG. Is maintained.

In the above configuration, when the lid body 2 is fitted to the receiving frame 1, as described above, the pressing block 5 causes the moment due to its own weight in the clockwise direction with the pivot pin 5c as a fulcrum in FIG. Occur. As a result, the valve body 4a of the plug 4 enters the burl hole 2a and at the same time strikes the opening edge of the lower end thereof to completely close the burl hole 2a, so that infiltration of rainwater or earth and sand can be reliably prevented.

When the cover body 2 is opened, the burl B is inserted into the burl hole 2a and the valve plate 4a is pushed down as shown in FIG. As a result, the plug 4 descends while being guided by the guide slit 3 a by the two rods 6 connected between the plug 4 and the holding rib 3, and the plug 4 is moved by the pin 7.
Is rotated counterclockwise around the pivot pin 5c. At this time, since the obturator plug 4 moves up and down and the pressing block 5 rotates, the pin 7 moves.
Moves toward the center of the lid body 2 in the connecting hole 4d.

In the movement of the closing plug 4 and the pressing block 5 as described above, the closing plug 4 is not rotated integrally with the pressing block 5, but is moved along the guide slit 3a.
a is moved up and down in parallel while maintaining the horizontal position. For this reason, the valve element 4a portion of the obstruction plug 4 moves quickly without abutting against the tapered fitting surface 1a of the receiving frame 1. Further, since the obturator plug 4 is connected to the two rods 6, it can be moved in a stable posture. Therefore, the crowbar B can be inserted into the crowbar hole 2a and work can be performed with a light operating force without forcibly increasing the pushing force when pushing down the obstruction plug 4, and the tip b of the crowbar B can be attached to the back surface of the lid body 2. Engage it, pull it out on the road surface and open it by turning or turning.

After the lid body 2 is pulled out of the receiving frame 1, 18
When the lid is opened by turning by 0 °, the seating surface 3f at the lower end of the holding rib 3 protruding from the back surface of the lid body 2 rests on the road surface.
When the tip b of the burl B inserted into the burl hole 2a is engaged with the back surface of the lid body 2, the lower end of the plug 4 does not protrude from the lower end of the holding rib 3, so that the burl tip b
Is not pressed against the back surface of the lid body 2 and the burl B can be easily removed.

That is, when the burl B is inserted and the closing plug 4 is lowered to such a depth that the tip end b can engage with the back surface of the lid main body 2, the lower end surface of the connection seat 4b becomes the seating surface 3f of the holding rib 3. It is important to set the height of the burl tip b, the height of the obturator plug 4, the length of the guide slit 3a, and the height of the holding rib 3 respectively so as to be positioned higher than that.

As described above, even when the lid body 2 is opened by turning by 180 °, the burl B can be easily removed from the burl hole 2a. You do not need to pull it out. Further, since the work can be performed without leaving the burl B inserted in the burl hole 2a of the lid main body 2, a safe work can be ensured without an operator tripping on the burl B.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in addition to the burl hole in which the outer peripheral edge of the lid body is cut out, a hole formed by the stopper plug, the holding rib, the pressing block, and the like described in the above-described embodiment is formed in a hand hook hole formed slightly from the outer peripheral edge to the center side of the lid body. An occlusion mechanism may be used. Further, the pins are fitted and fixed in the through holes, or retaining rings are provided at both ends of the rod to prevent the pins from coming off. However, bolts and nuts may be used.

[0033]

According to the present invention, the obturator can be moved up and down, so that the opening formed in the lid body can be reliably closed. In addition, when the lid body is pulled out in a state in which the lid opening jig is inserted from the opening and the front end portion is engaged with the back surface of the lid body and the lid is opened by 180 ° horizontal rotation, the tip of the lid opening jig is opened. since part does not protrude from the lower ends of the holding ribs of the closing <br/> embolic be engaged with the rear surface of the cover body, even if the height of the reinforcing ribs formed on the back surface of the lid body is low, The closure plug does not press the tip of the lid opening jig against the back surface of the lid body. For this reason, the tip of the lid opening jig has a degree of freedom between the upper surface of the closure plug and the back surface of the lid main body, and the lid opening jig can be easily removed from the opening.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of a hole closing mechanism of a lid for an underground structure according to the present invention.

FIG. 2 is a left side view of a main part excluding a receiving frame.

FIG. 3 is a bottom view of FIG.

FIG. 4 is an exploded perspective view showing the obturator plug and the pressing block together with their connecting members.

FIG. 5 is a longitudinal sectional view showing a state in which the obturator is pushed down by a bar.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 receiving frame 2 lid body 2a burl hole (opening) 3 holding rib 3a guide slit 3b holding hole 3c holding seat 3f seating surface 4 closing plug 4a valve element 4b connection seat 4c hole 4d connecting hole 4e contact portion 5 pressing block 5a arm 5b Weight part 5c Pivot pin 6 Rod 7 Pin B Bar (Jig for opening lid) b Tip of bar (End of jig for opening)

Claims (1)

(57) [Claims] 1. A lid for an underground structure provided with an opening for inserting a jig for opening the lid into a lid main body fitted into a receiving frame, wherein a closing plug for closing the opening, and a connecting plug connected to the closing plug. A pressing block pivotally supported on the lower surface of the lid main body so as to be vertically swingable and biasing the closing plug toward the opening side by its own weight; and the closing plug on the lower surface of the lid main body. And a holding rib formed at a position sandwiching the closing plug and capable of guiding the closing plug in the up-down direction, wherein the closing when the tip end of the opening jig inserted into the opening engages with the back surface of the lid main body. A hole closing mechanism for an underground structure lid, wherein a lower end of the stopper does not project from a lower end of the holding rib.