JPH11323984A - Opening and closing device for manhole cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening and closing device for a manhole cover having a simple structure and capable of safely and easily performing opening/closing operation of the cover in a short time by oneself. SOLUTION: A manhole cover 10 is connected to the opening part of a support frame 5 through the rotary joining part so as to be freely openable/closable, and a hydraulic jack 22 raising a ram by driving a plunger pump 23 by a manual lever 24 and lowering by a release of a return valve is installed in the support frame in the vicinity of the rotary joining part so as to be rotatable in the lower end part. The hydraulic jack and a locking member 27 detachably fixed to the manhole cover, are connected by a towing member 39.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
The present invention relates to a manhole cover opening / closing device installed in a manhole such as an underground common ditch for collectively storing telephone lines and the like.

[0002]

2. Description of the Related Art Manhole covers of this type include concrete covers and cast iron covers. Cast iron covers are generally used in places where opening and closing operations are frequently performed and where the opening area is large. in use. However, the total weight of the cast iron lid depends on its shape and size,
Because it weighs 100-800 kg, it is difficult to open and close manually, so heavy equipment such as a truck crane or a dedicated switch must be used, and accidents such as dropping the lid into the manhole due to erroneous opening and closing may also occur. There are various drawbacks, such as the danger of working.

[0003] In order to solve such a conventional drawback, two jigs are used and the lid is raised by rotating the jig. When the rail attached to the lid rises to the ground, the lid is placed on the ground. There is a jack-up type lid opening and closing mechanism that slides to open and close the lid, and a roller is installed in the lid receiver, and the lid is slid using the rotation of this roller to open and close the lid. Roller slide type lid opening and closing mechanisms have been developed.

[0004]

However, the lid opening / closing mechanism of the jack-up type or the roller slide type does not require the use of heavy equipment such as a crane and has the advantage that it does not require excessive human power. However, there is a problem that it is complicated and the price is high.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, has a simple structure, and allows a single person to open and close the lid safely and in a short time. The purpose of the invention is to provide a manhole cover that can be easily opened and closed by connecting a manhole cover to the opening of the support frame via a rotation coupling part. The plunger pump is driven by a manual lever to raise the ram on the support frame near the connecting portion, and a hydraulic jack that descends when the return valve is released is mounted so as to be rotatable at the lower end thereof. A manhole cover opening / closing device, comprising a structure in which a locking member fixed to the manhole cover and being attached to the manhole cover is connected by a traction member.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. In the drawings, reference numeral 5 denotes a rectangular supporting frame which is long in the left-right direction in plan view, The inner surface of the inner frame 7 is formed as a vertical surface at a predetermined depth from the upper end, and the lower surface is formed as an inwardly inclined surface. A plate-like packing 11A is attached to the entire outer periphery of the inclined surface. Reference numeral 8 denotes a reinforcing rib provided between the outer frame portion 6 and the inner frame portion 7, and the reinforcing rib 8 is flush with the upper end surfaces of the inner and outer frame portions 6, 7 via a mortar 9A. The paving tile 9 is stretched.

A manhole cover 10 is provided at the opening of the inner frame 7 so as to be openable and closable. The outer frame 11 of the manhole cover 10 has an upper half so that it can be fitted to the inner surface of the inner frame 7. The portion is formed as a vertical surface, and the lower half thereof is formed as an inwardly inclined surface. A bottom plate portion 10A is provided at a predetermined depth inside the manhole cover 10, and a pavement tile 12 is flush with an upper end surface of the outer peripheral frame portion 11 in a space above the bottom plate portion 10A. Is stretched.
Reference numeral 13 in the figure denotes a reinforcing rib provided below the bottom plate portion 10A.

Numeral 14 denotes a rotary joint for opening and closing the opening of the inner frame 7 and the manhole cover 10. A pair of right and left rotary joints 14 are provided on both sides of the outer surface of the inner frame 7. It is provided separately. As shown in FIGS. 1 and 6, the rotary joint 14 includes a shaft pin 15 and the shaft pin 15.
Comprises a pipe 16 rotatably inserted therein, and an arm 17 connecting the pipe 16 and the manhole cover 10. Both ends of the shaft pin 15 are parallel to the outer surface of the inner frame 7. The inner frame portion 7 is attached to the mounting plate 18 fixed separately.
Is fixed in parallel with the outer surface.

The arm 17 is formed by bending one end of a long flat plate into a U-shape, and the bent one end is fixed to the outer peripheral surface of the pipe 16 on the outer frame portion 6 side. Is fixed to the back surface of the bottom plate portion 10A of the manhole cover 10 by bolts 19 through an opening 7A formed in the inner frame portion 7.

Reference numeral 20 denotes a cover opening / closing mechanism for the manhole cover 10, and as shown in FIGS.
Hydraulic jack 22 fixed above and hydraulic jack 2
A plunger pump 23 for sending pressure oil to the second cylinder,
A movable cylindrical portion 25 for inserting and fixing the operation lever 24 of the plunger pump 23, a connecting member 26 fixed to the upper end of the ram of the hydraulic jack 22, and a locking fixed to the extension 26 A of the connecting member 26. And a member (eye bolt) 27.

One end of the movable cylindrical portion 25 is rotatably mounted on an upper part of a support post 28 provided at a position in front of the plunger pump 23.
The plunger pump 22 is pivotally mounted on the upper end of the plunger 2 and presses the other end of the cylindrical portion 25 to perform an oil feeding operation of the plunger pump 22. Also, a lower base 21 fixed to the lower surface of the base 21 of the lid opening / closing mechanism 20.
A pair of bearing plates 29, 29 are fixed in the center of A at a distance from each other, and each bearing plate 29, 29 is formed with a circular hole 29a into which the shaft pin 30 is inserted coaxially. In the drawing, reference numeral 30A denotes a ring fixed to the other upright end of the shaft pin 30 to facilitate insertion and removal of the shaft pin 30.

Numeral 31 denotes a rectangular recess in plan view, which is provided on the outer surface of the inner frame portion 7 and near the rotary coupling portion 14. In the center of the bottom plate 31A of the recess 31, a cylindrical portion 3 is provided.
A positioning member 32 having a shape in which a pin 32B is erected is fixed coaxially with 2A and the upper surface thereof. 33 is the concave portion 3
The closing plate 33 has a positioning hole 33A into which the pin 32B of the positioning member 32 is inserted, and a cylindrical portion 33B which can be fitted to the cylindrical portion 32A on the back surface. Each is provided. The closing plate 3
3 is a double bearing plate 2 of the lower base 21A.
A bearing plate 34 inserted between 9, 29 is fixed.
Bearing plates 35 and 36 are fixed to both other ends of the bearing plate 34 in parallel with the bearing plate 34, respectively.

Reference numerals 34a and 35a denote circular holes formed in the bearing plate 34 and one of the bearing plates 35, which are provided on a coaxial line so that the shaft pins 30 are inserted, and circular grooves are formed in the other bearing plate 36. 36a are formed. The height of the bearing plates 35 and 36 of the closing plate 33 is the same, the upper surface thereof is formed in a horizontal plane, and the corners of the upper surface are formed so that the lower base 21A of the hydraulic jack 22 which is inclined can smoothly move as described later. It is formed by an arc surface so that it can slide.

Reference numeral 37 denotes a locking member. At the position corresponding to the concave portion 31 on the inner side surface of the inner frame portion 7, a female screw for fixing the eyebolt of the locking member 37 in a freely screwable manner is engraved. Fixed portion 38 is provided. A traction member 39 connects the eyebolt 27 of the lid opening / closing mechanism 20 and the eyebolt 37. The illustrated traction member 39 is a turnbuckle having hooks at both ends.

Next, the operation of the above embodiment will be described. First, as shown in FIG. 13, the support frame 5 is placed on the upper surface 40A of the opening of the manhole 40 buried in the ground via a mortar M having a predetermined thickness. And install it. A cylindrical member rotatably screwed with an adjustment bolt 43 rotatably mounted on a thrust pad 42 of a height adjustment mechanism 41 provided at each of four corners in the support frame 5 on the opening upper surface 40A. 44 is grounded.

At this time, when there is a gradient on the road surface, or when there is a step between the road surface and the upper surface of the manhole cover 10, the cylindrical member is rotated by rotating the adjusting bolt 43 of each of the height adjusting mechanisms 41. The support frame 5 is moved up and down through 44 to adjust to a predetermined gradient or height. In the drawing, 45 is a pipe standing upright on the upper surface of the cylindrical member 44,
Reference numeral 46 denotes a lid for removably closing the upper end of the pipe 45. After the upper surface of the manhole cover 10 and the upper surface of the road surface are aligned in this manner, the height position fixing nut 49 screwed to the stud 48 of the height position fixing mechanism 47 provided on the manhole 40 is removed. The support frame 5 is fixed by tightening.

Next, a case where the manhole cover 10 which is fitted to the support frame 5 and closes the opening of the inner frame portion 7 will be described. First, the rotary connection portion 14 of the support frame 5 is opened.
The opening of the recess 31 provided in the vicinity is closed by the closing plate 33. At this time, a pin 32B of a positioning member 32 fixed to the recess 31 is inserted into a positioning hole 33A of the closing plate 33.
Is inserted, and a cylindrical portion 33B provided on the back surface of the closing plate 33 is fitted into the cylindrical portion 32A of the positioning member 32, so that the positioning of the closing plate 33 is performed. Is prevented from being accidentally moved.

Next, a pair of bearing plates 29, 29 fixed to the center of the lower surface of the lower base 21A of the lid opening / closing mechanism 20 are mounted on an upright bearing plate 34 fixed at the center of a closing plate 33 closing the opening of the concave portion 31. Insert so as to pinch. Then, the shaft pins 30 are inserted by coaxially aligning the circular holes and grooves of the bearing plates 29, 29, the bearing plate 34 fixed to the closing plate 33 and the shaft plates 35, 36 and the shaft plates 35, 36. The hydraulic jack 22, the plunger pump 23 and the like of the lid opening / closing mechanism 20 are rotatably mounted around the shaft pin 30 as a fulcrum. When the lid opening / closing mechanism 20 is not operated, the lower base 21A is in an upright state when the lower surface of the lower base 21A contacts the horizontal upper surfaces of both end plates 35 and 36 of the closing plate 33.

On the other hand, a locking member (eye bolt) 37 is screwed and fixed to a fixing portion 38 provided on the manhole cover 10. When the lid opening / closing mechanism 20 is mounted on the closing plate 33, the eyebolt 27 fixed to the extension 26A of the connecting member 26 of the lid opening / closing mechanism 20 is placed immediately above the eyebolt 37 fixed to the manhole cover 10. Arrange so that it is located. And, the eyebolts 27 corresponding to the upper and lower sides,
The upper and lower hooks of a traction member (turnbuckle) 39 are hooked on the 37 to connect the eyebolts 27 and 37 in a tensioned state. At this time, if the traction member 39 becomes loose, the buckling member 39 is adjusted by rotation.

When the plunger pump 22 is activated by manually operating the operating lever 24 inserted into the cylindrical portion 25 of the plunger pump 22 of the lid opening / closing mechanism 20, the hydraulic pressure is sent to the cylinder of the hydraulic jack 21. The ram and the connecting member 26 are pushed up, so that the connecting member 2
The eye bolt 27 fixed to the extension portion 26A of the sixth pulls up the eye bolt 37 fixed to the manhole cover 10 side via the traction member 39. Therefore, as shown in FIG. 10, the manhole cover 10 rotates in a direction in which the manhole cover 10 opens about the shaft pin 15 of the rotation coupling portion 14 as a fulcrum.

At this time, the inner frame 7 of the support frame 5 and the manhole cover 10 closing the opening of the inner frame 7 are vertical at a predetermined depth from the upper end, and are inward at the lower part. Since the manhole cover 10 is constituted by an inclined surface, the inner frame portion 7 and the manhole cover 1 when the manhole cover 10 rotates in the opening direction about the shaft pin 15 of the rotation coupling portion 14 as a fulcrum.
No twisting occurs between 0 and 0, and it rotates smoothly.

Further, when the manual operation of the operation lever 24 is continued, as shown in FIG.
Since the connecting member 26 is raised and the traction member 39 is in a tension state, the hydraulic jack 22 and the like on the base 21 are tilted with the shaft pin 30 as a fulcrum, and finally, as shown in FIG. The manhole cover 10 can be opened at 100 degrees.

Next, when the manhole cover 10 opened at 100 degrees is closed, a return valve (not shown) is opened to return the oil in the cylinder of the hydraulic jack 21 to the plunger pump 22 so that the hydraulic pressure in the cylinder is reduced. After removing
By lightly pushing the manhole cover 10 in the direction to close it by hand,
The manhole cover 10 is rotated by its own weight in a lowered state about the shaft pin 15 of the rotary coupling portion 14 as a fulcrum, and is fitted into the opening of the inner frame 7 of the support frame 5 in a closed state. At this time, the inner frame 7
Since the packing 11A mounted on the inclined surface of the manhole is crushed by the inclined surface of the manhole cover 10, the fitting portion between the support frame 5 and the manhole cover 10 is completely sealed by the packing 11A, and water on the road surface is removed by manhole. There is no entry into 40. Thereafter, the lid opening / closing mechanism 20 attached to the support frame 5, the locking member (eye bolt) 37 fixed to the manhole cover 10, the traction member 39, and the like are removed.

[0024]

The opening / closing device for a manhole cover according to the present invention has the above-described structure, so that the structure is simple and can be provided at a low cost. And it can be easily performed in a short time. Also,
Since the fitting portion between the support frame and the manhole cover is formed of a vertical surface and an inclined surface, when the manhole cover is opened and closed, the support frame does not twist and smoothly rotates. By installing packing on the inclined surface, there are various effects such that the waterproofness is ensured and the sealing effect is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view in which a part of a manhole cover opening and closing device according to the present invention is cut away.

FIG. 2 is a plan view of the same device.

FIG. 3 is a sectional view taken along line II-II of FIG. 2;

FIG. 4 is a sectional view taken along line III-III in FIG. 2;

FIG. 5 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 6 is an enlarged cross-sectional view of a rotationally connected portion between a manhole cover and a support frame.

FIG. 7 is an exploded perspective view of a cover opening / closing mechanism of the manhole cover.

FIG. 8 is a partially cutaway front view showing a use state of a cover opening / closing mechanism for a manhole cover.

FIG. 9 is a partially cut-away side view showing a use state of a cover opening / closing mechanism of a manhole cover.

FIG. 10 is an explanatory diagram immediately after the opening of the manhole cover is started.

FIG. 11 is an explanatory view of the manhole cover during opening.

FIG. 12 is an explanatory view when the manhole cover is completely opened.

FIG. 13 is a sectional view of a height adjusting portion of the manhole cover.

[Explanation of symbols]

 Reference Signs List 5 support frame 7 inner frame part 10 manhole cover 14 rotation connection part 20 lid opening and closing mechanism 22 hydraulic jack 23 plunger pump 24 manual lever 27 locking member 39 traction member

Claims (4)

[Claims] 1. A manhole cover is openably and closably connected to an opening of a support frame via a rotary joint, and a plunger pump is driven by a manual lever on the support frame near the rotary joint to drive the ram. A configuration in which a hydraulic jack that rises and descends upon release of a return valve is rotatably mounted at its lower end, and the hydraulic jack and a locking member that is fixed to the manhole cover so as to be freely attached are connected by a traction member. An opening / closing device for a manhole cover, comprising: 2. The manhole cover opening / closing device according to claim 1, wherein the traction member is constituted by a turnbuckle capable of adjusting a distance between hooks at both ends thereof. 3. An inner side surface of the support frame is formed as a vertical surface at a predetermined depth from the upper end, and a lower portion thereof is formed as an inwardly inclined inclined surface. 3. The manhole cover opening / closing device according to claim 1, wherein the manhole cover fitted into the opening is substantially the same in cross section as the opening. 4. The manhole cover opening / closing device according to claim 3, wherein a packing is mounted on the inclined surface.