JP2001020308A - Opening and closing method for manhole lid and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for opening and closing a manhole lid safely and easily by a little force and by one person. SOLUTION: A square manhole lid 2 provided in a manhole opening part is vertically lifted up to a predetermined height by driving a pair of left and right hydraulic jacks 32, 49 provided on both left and right outer sides of the manhole lid 2. After that, the manhole lid 2 is rotated in outer direction using an outer side of its front side or rear side as the center of rotation by further driving the hydraulic jack 32 on one side which is connected by the manhole lid 2 and a traction member 46 to open the opening part of a manhole M.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole cover opening / closing device, and more particularly, to a square manhole cover installed in a manhole such as an underground common ditch for collectively storing water and sewage, electric wires, telephone lines, and the like. The present invention relates to an opening and closing method and an apparatus therefor.

[0002]

2. Description of the Related Art In a manhole in an underground common trench such as a telephone line, 800 mm × 400 mm, 1200 mm × 6 mm.
A square manhole cover formed of 00 mm size cast iron is generally used. In order to open and close the manhole cover, two workers are required because of its heavy weight. Each worker inserts a hook into a keyhole formed in the manhole cover, and lifts or holds the manhole cover together. It is done by lowering.

Therefore, in the above-described conventional opening / closing method, at least two workers are required, so that the running cost is high, the burden on the workers is large, and the lid is dropped into the manhole due to an erroneous opening / closing operation. There is a drawback that an accident may occur, and that there is a danger during work.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and it is desired that the opening and closing operation of the lid can be performed by one person and with little labor. It is another object of the present invention to provide an opening / closing method and an apparatus therefor which require less danger at the time of work and in which the opening of the manhole and the lid can be reduced.

[0005]

In order to achieve the above object, according to the first and second aspects of the present invention, a square manhole cover installed in an opening of a manhole is provided on both left and right outer sides of the manhole cover. The pair of left and right hydraulic jacks is driven to lift vertically to a predetermined height, and then the manhole cover is further driven by one of the hydraulic jacks connected to the manhole cover and the traction member to move the manhole cover outside the front side or the rear side. By rotating outwardly as a center of rotation, opening the manhole opening, and opening the manhole opening, this manhole cover is opened by the return valve opening drive of one hydraulic jack connected to the manhole cover by a traction member. After rotating the manhole cover inward to position the manhole cover above the opening of the manhole, the two return jacks are further driven to open the return valve to release the manhole. The hole cap is lowered vertically, it is the gist in a closed process of the manhole cover, characterized in that to close the opening of the manhole.

According to a third aspect of the present invention, a pair of left and right stays fixed through a keyhole to a rectangular manhole cover installed in an opening of the manhole, and a pair of right and left stays perpendicular to the pair of stays. A lateral frame disposed outside the front side or the rear side of the manhole cover, which is rotatably connected thereto,
A pair of left and right vertical frames fixed to both ends of the horizontal frame, and a hydraulic jack in which the plunger pump is driven by the operation lever to raise the ram and lower by releasing the return valve, and at the lower end thereof, the front and rear of the manhole cover. A pair of left and right hydraulic jacks respectively mounted on the left and right vertical frames so as to be tiltable in the direction, and one of the hydraulic jacks is connected to the one of the stays by a traction member fixed to the ram. The other hydraulic jack is configured such that the locking member fixed to the ram and the locking member fixed to the other stay are engaged, the manhole cover is lifted vertically, and then converted into a rotary motion and opened. There is a gist of a manhole cover opening / closing device characterized in that:

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments shown in the drawings. In the drawings, reference numeral 1 denotes an outer frame member provided at an opening of a manhole M; It is a square manhole cover that can be fitted inside. The outer frame member 1 has the same external shape as the manhole cover 2 in a rectangular shape that is long in the left-right direction in plan view and has a predetermined height,
The inner side surface is formed by an inclined surface 1A that is inclined inward from the upper end to a depth corresponding to the thickness of the manhole cover 2, and a step portion 1B that supports the manhole cover 2 is provided at the lower end.

Numeral 3 denotes a keyhole provided on the top surface of the manhole cover 2, as shown in FIG. 13, provided in pairs near the left and right sides on the right and left sides of the manhole cover. The outer peripheral surface of the manhole cover 2 is formed as an inclined surface so that the outer peripheral surface can be fitted in close contact with the inner side surface of the outer frame member 1. Reference numeral 4 denotes a lid opening / closing framework, which includes a pair of stays 5A, 5A which can be fixed to the manhole cover 2, and a horizontal frame 6 which is installed in a direction perpendicular to the both stays 5A.
And a pair of left and right vertical frames 7A, 7A installed orthogonally to both ends of the horizontal frame 6, and a pair of open / close drive units 8A, 8A serving as opening / closing power for the manhole cover 2.

Each of the stays 5A, 5A has a rectangular cylindrical shape with an open lower surface, and is formed to be longer than the length of the manhole cover 2 in the front-rear direction. The bearing plates 9 and 9 are fixed to face each other so as to protrude from the front end 5b, and a circular hole 11 into which the shaft pin 10 is inserted is formed on both bearing plates 9 and 9 on the coaxial line. Is formed. Reference numeral 12 denotes a separation pipe fixed on the coaxial line of the circular hole 11 between the opposed inner surfaces of the bearing plates 9 and 9.

Reference numerals 13 and 13 denote lid fixing devices of the same construction provided on the top surface portion 5c of the stays 5A and 5A, which are provided near the rear end 5a and the front end 5b of the top surface portion 5c, respectively. The distance between the two lid fixing devices 13 is the same as the distance between the front and rear keyholes 3 formed in the manhole cover 2. As shown in FIG. 5, the lid fixing device 13 has a shaft portion 16 in which a male screw 15 is engraved inserted in a circular hole 14 opened in the top surface portion 5c so as to be vertically movable. The rod-shaped hook 17 insertable into the keyhole 3 is fixed in a T-shape,
On the upper end, a turning rod 18 is fixed in a T-shape so as to be orthogonal to the rod hook 17, and a tightening nut 19 is screwed to the male screw 15. In addition,
If one of the front and rear lid fixing members 13 can be moved in the longitudinal direction (by changing the circular hole 14 into a long hole), the alignment with the key holes 3 and 3 becomes easy.

Reference numeral 20 denotes an eyebolt engaging portion which is fixed to the upper surface of a convex portion 5B protruding from the outer surface of the right stay 5A, and has an engaging member 21 on the outer surface of the left stay 5A.
Has been fixed. The locking member 21 has a crank shape in which an upper horizontal portion 23 and a lower horizontal portion 24 are connected to each other in a direction opposite to each other above and below a vertical portion 22, and an end of the lower horizontal portion 24 is provided on the stay 5A. It is fixed to the outer surface.

The horizontal frame 6 has a rectangular cylindrical shape with an open upper surface, and is formed to be longer than the horizontal width (lateral width) of the manhole cover 2. Mounting plates 25 are fixed to both ends of the horizontal frame 6, respectively.
Are formed in the vicinity of both ends. In the vicinity of both ends of the horizontal frame 6, a pair of bearing plates 27, 27 respectively connected to the bearing plate 9 are fixed so as to be separated by the same width as the separation width of the bearing plate 9. An elongated hole 28 in which the shaft pin 10 can move up and down is formed in 27 and 27.

Each of the pair of vertical frames 7A, 7A has a rectangular cylindrical shape with an open upper surface, and is formed to be longer than the length of the stay 5A. And both vertical frames 7
Concave portions 29 are formed near the upper ends of A and 7A, respectively. An insertion hole 30 having the same diameter is formed at a position corresponding to the insertion hole 26 of the mounting plate 25 fixed to the horizontal frame 6 at substantially the center of the inner surface of each of the vertical frames 7A, 7A. The concave portion 29 is formed at a position corresponding to the convex portion 5B of the right stay 5A when the stay 5A and the frames 6, 7A are assembled.

Further, the opening / closing drive section 8A on the right side is a
As shown in FIG. 7, a hydraulic jack (main jack) 32 fixed to the upper surface of a rectangular upper base 31 and a plunger pump 33 for feeding pressure oil to the hydraulic jack 32
A cylindrical portion 35 for inserting and fixing an operating lever 34 of the plunger pump 33; a connecting member 36 fixed to the upper end of the ram of the hydraulic jack 32; and a lower surface of an extending portion 36A of the connecting member 36. Eyebolt locking part 37
And a lower base 38 for closing the recess 29.

Numeral 39 denotes a column standing upright in front of the plunger pump 33. One end of the cylindrical portion 35 is connected to the column 3
9 (see FIGS. 7 and 8), which is pivotally attached to the upper part of
The middle is pivotally connected to the upper end of the plunger pump 33. Then, the plunger pump 33 is configured to perform an oil feeding operation by pressing the other end of the cylindrical portion 35. A bearing portion 40 is fixed to the center of the lower surface of the upper base 31, and a circular hole 42 into which a shaft pin 41 is inserted is formed in the bearing portion 40. The central axis direction of the circular hole 42 coincides with the left-right direction of the manhole cover 2.

Reference numerals 43, 43 denote a pair of bearings fixed to the upper surface of the lower base 38, which are fixed apart from each other so as to sandwich the bearing 40 of the upper base 31. 43 is a circular hole 4 into which the shaft pin 41 is inserted.
4 is formed on the coaxial line. Further, a prism portion 45 that can be fitted into the concave portion 29 is protruded from the lower surface of the lower base 38. Reference numeral 46 denotes a pulling member stretched between the upper and lower locking portions 20 and 37.
A and an openable / closable ring 46 connected to the ring 46A.
B, but may be a turnbuckle or the like whose length is adjustable.

The opening / closing drive section 8A on the left side includes a locking member 4
7 is the same as the opening / closing drive section 8A on the right side, and therefore the description thereof is omitted.
Will be described below. The locking member 47 has the same shape as the locking member 21 of the left stay 5A, and has an upper horizontal portion 48.
Is fixed to the upper end of the ram of a hydraulic jack (minijack) 49, and the lower horizontal portion 50 is in contact with the lower surface of the upper horizontal portion 48 of the locking member 21. Since the hydraulic jack 49 is used only for slightly lifting the manhole cover 2 as will be described later, its stroke may be small. In the figure, reference numeral 51 denotes a plunger pump.
52 is an operation lever.

Next, the operation of the above embodiment will be described. First, as shown in FIG. 5 and FIG. 6, the left and right stays 5A, 5A, After inserting the rod-shaped hook 17 into the lid fixing device 13 attached to the 5A, the rotating rod 18 is manually rotated by 90 ° so that the rod-shaped hook 17 cannot be pulled out from the keyhole 3. Next, a fastening nut 19 screwed to the male screw 15 of the shaft portion 16 is tightened to fix the stays 5A and 5A on the left and right of the upper surface of the manhole cover 2, respectively. At this time, the bearing plates 9 of the stays 5A, 5A are located outside the outer frame member 1 of the manhole cover 2.

Next, after the horizontal frame 6 is installed orthogonally to the stay 5A on the bearing plate 9 side of the stays 5A, 5A, the bearing plate 9 is inserted between the left and right bearing plates 27, The circular hole 11 of the bearing plate 9 and the long hole 28 of the bearing plate 27
The stays 5A and 5A are rotatably connected to the horizontal frame 6 by inserting the shaft pin 10 into the horizontal frame 6. At this time, both ends of the horizontal frame 6 are located outside the manhole cover 2. Next, the vertical frames 7A, 7A are arranged orthogonally to the two mounting plates 25, 25 of the horizontal frame 6, respectively, and the two insertion holes 2 of the mounting plates 25, 25 and the vertical frames 7A, 7A are arranged.
After matching 6 and 30, both are connected and fixed with bolts and nuts (not shown).

After the prism 45 of the lower base 38 is inserted into and fixed to the recess 29 of the right vertical frame 7A, the bearing 40 of the upper base 31 is inserted between the bearings 43 of the lower base 38. Inserted and tandem circular holes 42, 4
The shaft pin 41 is inserted into the base 4 and the hydraulic jack (main jack) 32 is connected to the lower base 38 so as to be tiltable in the front-rear direction of the manhole cover 2. Next, the traction member 46 is connected between the locking portion 20 of the right stay 5A and the locking portion 37 of the connecting member 36.

On the other hand, the concave portion 2 of the left vertical frame 7A
9, a hydraulic jack (mini-jack) 49 is attached to the concave portion 29 so as to be tiltable in the front-rear direction of the manhole cover 2 similarly to the case of the right vertical frame 7A. On this occasion,
The lower horizontal portion 50 of the locking member 47 fixed to the hydraulic jack 49 is brought into contact with the lower surface of the upper horizontal portion 23 of the locking member 21 of the left stay 5A.

Therefore, as shown in FIGS. 8 and 9, first, the operating lever 52 of the open / close drive unit 8A on the left side is moved up and down to send pressure oil from the plunger pump 51 to the hydraulic jack (mini jack) 49. By raising the locking member 47, the lower horizontal portion 50 abuts against the lower surface of the upper horizontal portion 23 of the locking member 21 mounted on the stay 5A. As a result, the manhole cover 2 is slightly lifted on one side (left side). Next, when the right operation lever 34 is operated, FIG.
As shown in (1), the connecting member 36 is initially raised by the pressure oil sent from the plunger pump 33 to the hydraulic jack (main jack) 32, so that the manhole cover 2 is raised vertically via the traction member 46 and the stay 5A. Then, it is in a horizontal state.

At this time, the shaft pin 10 connecting the stay 5A and the horizontal frame 6 is located at the upper end of the elongated hole 28 of the bearing plate 27, and it is impossible for the shaft pin 10 to rise vertically. The reason for raising the manhole cover 2 to the vertical state as described above is that if the manhole cover 2 is directly opened with the shaft pin 10 as a fulcrum, the front edge portion of the manhole cover 2 on the opposite side of the hinge is attached to the outer frame member 1. This is because the opening and closing operation becomes difficult due to collision.

Further, when the right operation lever 34 is continuously operated, the manhole cover 2 which has risen vertically changes into a rotational motion with the shaft pin 10 as a fulcrum as shown in FIGS. Becomes When the manhole cover 2 is opened at least 110 °, the operation lever 3 is opened.
When the operation of Step 4 is stopped, the manhole M is completely opened. Since the operation of opening the manhole cover 2 merely moves the operation lever 34 of the hydraulic jack 32 up and down, a light force of about 3 kg to 4 kg is required.
If the hydraulic jack 32 is depressurized by opening the manhole cover 2 at 90 degrees or more, the safety of the worker is assured because the manhole cover 2 does not fall down to the outer frame member 1 side.

When the manhole cover 2 is closed, a hydraulic valve (main jack) 32 is depressurized by opening a release valve (not shown), and the manhole cover 2 is gently moved inward (the manhole M of the manhole M) around the shaft pin 10 as a fulcrum. The upper horizontal portion 23 of the locking member 21 attached to the left stay 5A collides with the lower horizontal portion 50 of the locking member 47 by rotating further in the opening direction).
Is horizontal above the opening of the manhole M. In this state, when the release valve (not shown) is opened and the hydraulic jack (mini jack) 49 is also reduced in pressure together with the hydraulic jack (main jack) 32, the manhole cover 2 hangs down to the opening of the manhole M to be in a closed state. At this time, since the manhole cover 2 is connected to the horizontal frame 6 by the shaft pin 10, it is possible to prevent an accident without dropping carelessly.

[0026]

According to the present invention having the above-described structure, the existing manhole cover can be opened and closed by a single person and with a small amount of labor, and a fall accident may occur. And safety is improved. Also, since the opening and closing operation is performed using hydraulic pressure, there is little shock. Therefore, particularly when the hand is accidentally released during opening / closing where the greatest supporting force is required, a large injury and damage to the roadbed material have been caused. However, in the present invention, since the shock is small, the safety of work is reduced. And the damage of the roadbed material can be prevented. Also, since the manhole cover is vertically lifted and lowered at the beginning of opening and at the end of closing, the manhole cover can be smoothly and reliably opened and closed with a light force without contacting the outer frame member. Can,
There are various effects.

[Brief description of the drawings]

FIG. 1 is a perspective view of a manhole cover opening / closing device according to the present invention.

FIG. 2 is a perspective view when the manhole cover is completely opened.

FIG. 3 is an exploded perspective view of a manhole cover opening / closing device.

FIG. 4 is an exploded perspective view of a manhole cover opening / closing drive unit.

FIG. 5 is an explanatory view of a manhole cover before the cover is fixed.

FIG. 6 is an explanatory diagram after the manhole cover is fixed.

FIG. 7 is an explanatory diagram of an operation immediately before the manhole cover is opened.

FIG. 8 is an operation explanatory diagram immediately after the manhole cover is opened.

FIG. 9 is an explanatory diagram of an operation immediately before opening of a manhole cover viewed from different positions.

FIG. 10 is an explanatory diagram of an operation immediately after the manhole cover is opened.

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

FIG. 12 is an explanatory diagram of the operation when the manhole cover is completely opened.

FIG. 13 is a perspective view of a manhole to which the manhole cover opening / closing device is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer frame member 2 Manhole cover 3 Keyhole 4 Lid opening / closing frame set 5A Stay 6 Horizontal frame 7A Vertical frame 20 Locking part 21 Locking member 32 Hydraulic jack 33 Plunger pump 34 Operating lever 36 Connecting member 37 Locking part 46 Pulling member 47 Locking member 49 Hydraulic jack 51 Plunger pump 52 Operating lever M Manhole

Claims (3)

[Claims] 1. A pair of right and left hydraulic jacks installed on both left and right outer sides of the manhole cover are used to drive a square manhole cover installed in an opening of the manhole vertically up to a predetermined height, and thereafter tow the manhole cover and the tow. The manhole cover is rotated by further driving one of the hydraulic jacks connected by a member to rotate the manhole cover outward around a front side or a rear side of the manhole cover to open an opening of the manhole. Opening method. 2. A manhole cover having a manhole opening formed by the method according to claim 1, wherein the manhole cover is rotated inward by a return valve opening drive of one hydraulic jack connected to the manhole cover by a traction member. And closing the manhole cover by closing the manhole cover by further driving the return valves of both hydraulic jacks to open the manhole cover. Method. 3. A pair of left and right stays fixed through a keyhole to a rectangular manhole cover installed in an opening of the manhole, and a pair of right and left stays are connected rotatably at right angles to the pair of left and right stays. A horizontal frame disposed outside the front side or the rear side of the manhole cover, a pair of right and left vertical frames fixed to both ends of the horizontal frame, and a plunger pump driven by an operation lever to raise the ram to raise the return valve. A hydraulic jack descending by release, comprising a pair of left and right hydraulic jacks respectively mounted on the left and right vertical frames so that the lower end thereof can be tilted in the front-rear direction of the manhole cover. One is connected to the one stay by a traction member fixed to the ram, and the other hydraulic jack is fixed to the locking member fixed to the ram and the other stay. A manhole cover opening / closing device, wherein the manhole cover is lifted vertically and then converted into a rotary motion to be opened by engaging with a locking member.