JP5351692B2 - Manhole switchgear - Google Patents

Description

  The present invention relates to a manhole opening and closing device that opens and closes a hole (manhole) made to allow people to go in and out for cleaning and inspection.

  As a general manhole opening / closing device, for example, one disclosed in Patent Document 1 is known.

JP 2002-167786 A

  Also, in gas turbine combined power plants, open and close holes (manholes) that allow people to enter and exit for cleaning and inspection of boilers such as exhaust heat recovery boilers (HRSG) that recover heat from gas turbine exhaust gas As a manhole opening / closing device, a plate-shaped access panel (also referred to as “access door”) having a rectangular shape in plan view is provided with a plurality of (for example, 8 to 12) erected on the peripheral edge of a hole (manhole). Book) and nuts threadably engaged with each of the stud bolts, for example, a floor plate (for example, a partition plate (also referred to as a “shelf plate”) constituting a header housing of the exhaust heat recovery boiler). What is fixed is known.

However, in such a manhole opening / closing device, an impurity having a diameter of about 0.1 mm together with exhaust gas (for example, an oxide scale in which the surface of the screw itself is oxidized and expanded) is formed between the male screw portion of the stud bolt and the female screw portion of the nut. When opening the manhole, the nut could not be turned as desired with a tool such as a wrench, and it took a long time to open the access panel. It was.
Further, when baking is significant, the stud bolt must be cut with a tool such as a cutter to open the access panel.

  The present invention has been made in view of the above circumstances, and can open and close a hole (manhole) without using a tool, and is applied to a boiler such as an exhaust heat recovery boiler (HRSG). However, an object of the present invention is to provide a manhole opening / closing device that can prevent burning.

The present invention employs the following means in order to solve the above problems.
A manhole opening and closing device according to the present invention includes a circular portion having a substantially circular shape in a plan view provided on a floor plate, and a substantially rectangular shape in a plan view cut out outward from the circular portion at equal intervals in the circumferential direction. Alternatively, a manhole opening and closing device that opens and closes a hole having at least two notch portions that have a substantially trapezoidal shape in plan view, and is a plate-like shape that has a substantially circular shape in plan view and is accommodated inside the hole to close the hole. A lid for receiving the lid, the lid having a claw projecting outward at a position corresponding to the notch, and the receiving frame comprising the notch An upper receiving frame fixed to the upper surface of the floor plate so as to cover one end upper part in the circumferential direction of the part, and a lower receiving frame fixed to the lower surface of the floor plate so as to cover the entire lower part of the notch, Between the upper receiving frame and the lower receiving frame, It is provided with a gap for accommodating the.

According to the manhole opening and closing device according to the present invention, the lid supported by the lower receiving frame is rotated by a predetermined angle (for example, about 2 to 20 degrees) in one direction (for example, counterclockwise when viewed from above). When the claws are accommodated in the corresponding gaps, the hole (manhole) closing operation is completed, and the lid supported by the lower receiving frame is moved at a predetermined angle in the other direction (for example, clockwise when viewed from above). The hole (manhole) opening operation is completed by rotating (for example, about 2 to 20 degrees) and lifting the lid in a state where each nail comes out of the corresponding gap.
Thereby, a hole (manhole) can be opened and closed without using a tool, and even when applied to a boiler such as a waste heat recovery boiler (HRSG), baking can be prevented.

  In the manhole opening and closing device, a baffle plate for preventing the claw accommodated in the gap from coming out of the gap is rotatable on the lower receiving frame located below the other end in the circumferential direction of the notch. More preferably, it is attached.

According to such a manhole opening and closing device, the baffle plate is rotated and dropped (fitted) into the other end portion in the circumferential direction of the cutout portion, so that the claw is prevented from coming out of the gap, and the lid body due to vibration or the like is prevented. This prevents rotation in the other direction (for example, clockwise when viewed from above).
Thereby, it can prevent that a cover body removes carelessly and can prevent the careless opening of a hole (manhole).

  In the manhole opening and closing device, the lower receiving frame is formed in a plate shape having a substantially crescent shape in plan view, formed so that the curvature of the arc located on the inner peripheral side and the curvature of the arc located on the outer peripheral side are the same. It is more preferable that the member is.

  According to such a manhole opening and closing device, for example, as shown in FIG. 19, when a large number of lower receiving frames are produced from a single plate member having a rectangular shape in plan view, The arc located on the outer side will be cut off, and if the arc located on the inner peripheral side is cut off, the arc located on the outer peripheral side will be cut off, so the amount of waste material can be reduced as much as possible. Manufacturing costs can be reduced.

  According to the manhole opening and closing device according to the present invention, a hole (manhole) can be opened and closed without using a tool, and even when applied to a boiler such as an exhaust heat recovery boiler (HRSG), baking is prevented. There is an effect that can be done.

It is a figure which shows the manhole opening / closing apparatus which concerns on one Embodiment of this invention, Comprising: (a) is the top view which looked at the hole (manhole) and the receiving frame from right above, (b) is the top view of a cover body. It is a perspective view which shows the manhole opening / closing apparatus which concerns on one Embodiment of this invention. It is a top view of the lower receiving frame shown in FIG. 1 and FIG. It is a figure for demonstrating the procedure which attaches a cover body to a receiving frame from the upper direction of a floor board, and closes opening with a cover body, Comprising: It is the top view which looked at the manhole opening / closing apparatus from right above. It is a figure for demonstrating the procedure which attaches a cover body to a receiving frame from the upper direction of a floor board, and closes opening with a cover body, Comprising: It is the perspective view which looked at the manhole opening / closing apparatus from diagonally upward. It is sectional drawing which shows the principal part of the manhole opening / closing apparatus which concerns on one Embodiment of this invention. It is a figure for demonstrating the procedure which attaches a cover body to a receiving frame from the upper direction of a floor board, and closes opening with a cover body, Comprising: It is the top view which looked at the manhole opening / closing apparatus from right above. It is a figure for demonstrating the procedure which attaches a cover body to a receiving frame from the upper direction of a floor board, and closes opening with a cover body, Comprising: It is the perspective view which looked at the manhole opening / closing apparatus from diagonally upward. It is a figure for demonstrating the procedure which attaches a cover body to a receiving frame from the upper direction of a floor board, and closes opening with a cover body, Comprising: It is the top view which looked at the manhole opening / closing apparatus from right above. It is a figure for demonstrating the procedure which attaches a cover body to a receiving frame from the upper direction of a floor board, and closes opening with a cover body, Comprising: It is the perspective view which looked at the manhole opening / closing apparatus from diagonally upward. It is sectional drawing which shows the principal part of the manhole opening / closing apparatus which concerns on one Embodiment of this invention. It is a figure which shows the manhole opening / closing apparatus which concerns on one Embodiment of this invention, Comprising: It is the perspective view which looked at the cover body from diagonally upward. It is the perspective view which looked at the cover body shown in FIG. 12 from diagonally downward. It is a figure which shows the manhole opening / closing apparatus which concerns on one Embodiment of this invention, Comprising: It is the perspective view which looked at the cover body from diagonally upward. It is the perspective view which looked at the cover body shown in FIG. 14 from diagonally downward. It is a figure for demonstrating the effect of the manhole opening / closing apparatus which concerns on one Embodiment of this invention. It is a figure for demonstrating the effect of the manhole opening / closing apparatus which concerns on one Embodiment of this invention. It is a figure for demonstrating the effect of the manhole opening / closing apparatus which concerns on one Embodiment of this invention. It is a figure for demonstrating the effect of the manhole opening / closing apparatus which concerns on one Embodiment of this invention.

Hereinafter, an embodiment of a manhole opening / closing device according to the present invention will be described with reference to FIGS.
The manhole opening and closing device 1 according to the present invention is a device that opens and closes a hole (manhole) 2 that is made so that a person can go in and out for cleaning and inspection of a boiler such as an exhaust heat recovery boiler (HRSG), for example. As shown in FIG. 1 or FIG. 2, a lid 3 and a receiving frame 4 that receives (supports) the lid 3 are provided.

For example, the hole 2 is a floor plate of a structure (not shown) (for example, a partition plate (also referred to as a “shelf plate”) 5 having a thickness of about 6 mm constituting a header housing of an exhaust heat recovery boiler). An opening provided so as to penetrate in the plate thickness direction, a circular portion 6 having a substantially circular shape in a plan view, and a substantially rectangular shape in a plan view or a plan view cut out outward from the circular portion 6 And a notch 7 having a substantially trapezoidal shape.
The inner diameter of the circular portion 6 is formed to be slightly larger (about 5 mm to 40 mm) than the outer diameter of the facing lid 3.
Three cutouts 7 are provided at equal intervals in the circumferential direction (every 120 degrees), and the inner diameter of the cutout 7 is slightly smaller than the outer diameter of the claw 8 of the facing lid 3 (about 5 mm to 40 mm). ) It is formed to be large. The circumferential length of the notch 7 is formed so that the lid 3 can be slightly rotated (about 2 to 20 degrees) in the circumferential direction.

The lid 3 is a plate-like member having a substantially circular shape in plan view, and three claws 8 are provided on the outer circumference thereof at equal intervals in the circumferential direction (every 120 degrees). Further, on the lower surface (back surface) 9 (see FIG. 13 or 15) of the lid body 3, ribs having a regular triangular shape in plan view are arranged so that each vertex 10 is positioned in the vicinity of the corresponding claw 8. 11 is provided, and a handle 12 is provided on the inner side (center of gravity side) of the rib 11.
When the lid 3 is exposed to a high temperature (300 ° C. to 800 ° C.), the lid 3 is made of alloy steel, stainless steel or the like (eg, SCMV4 or SUS310) and exposed to a low temperature (eg, normal temperature to 400 ° C.). When made, it is made of carbon steel (for example, SS400) or the like.

The receiving frame 4 includes an upper receiving frame 14 fixed to the upper surface (front surface) 13 of the floor plate 5 in which the holes 2 are formed by welding or the like, and a lower surface (back surface) 15 of the floor plate 5 in which the holes 2 are formed (see FIG. 6 or FIG. 11) and a lower receiving frame 16 fixed by welding or the like.
The upper receiving frame 14 is a plate-like member having a substantially rectangular shape in plan view or a substantially trapezoidal shape in plan view, and is disposed so as to cover the upper end of the cutout portion 7 in the circumferential direction.
The lower receiving frame 16 is formed so that the curvature of the arc located on the inner circumference side and the curvature of the arc located on the outer circumference side are the same, that is, having the same radius, in a substantially crescent shape in plan view. Is a plate-like member (see FIG. 3), and is arranged so as to cover the entire lower part of the notch 7. In addition, three lower receiving frames 16 are arranged side by side without any gaps in the circumferential direction, and an opening 17 having a circular shape in plan view, in which a person actually goes in and out, is formed by the inner periphery of these lower receiving frames 16. Become. The inner diameter of the opening 17 is formed so as to be slightly smaller (about 10 mm to 50 mm) than the inner diameter of the hole 2, and the peripheral edge of the lid 3 is formed by the peripheral edge located inside the lower receiving frame 16 in the radial direction. It has come to be supported. Further, the lower receiving frame 16 positioned below the other end portion in the circumferential direction of the notch portion 7 penetrates in the plate thickness direction and through-holes 20 (FIG. 6 or FIG. 6) support the rotation shaft 19 of the baffle plate 18 rotatably. 11) is formed.
Note that a gap 21 (see FIG. 6) is formed by the upper receiving frame 14 and the lower receiving frame 16 at one end in the circumferential direction of the notch 7, and the corresponding claw 8 is accommodated in each gap 21. (See FIG. 11). The height of the gap 21 is formed to be slightly larger (about 0.5 mm to 2 mm) than the plate thickness of the claw 8, that is, the plate thickness of the lid 3.
Moreover, the baffle plate 18 is formed so that it can fit in the notch part 7, and can prevent each nail | claw 8 from coming out from the corresponding clearance gap 21 completely (refer FIG. 11).

Next, a procedure for attaching the lid 3 to the receiving frame 4 from above the floor plate 5 and closing the opening 17 with the lid 3 will be described.
First, as shown in FIG. 12, the lower end (bottom surface) of the upper end portion grasps the handle 12 that is in contact with the upper surface (front surface) 22 of the lid 3, and pulls up the handle 12 as shown in FIG. As shown in FIGS. 4 and 5, the lid 3 is lifted and placed on the hole 2 so that the corresponding claw 8 is positioned (come) on the lower receiving frame 16 exposed through the notch 7. Bring the lid 3, gradually lower the lid 3, and place the corresponding claws 8 on the lower receiving frames 16 exposed through the notches 7 (see FIG. 6). The peripheral edge of the lid 3 is placed on the peripheral edge located on the inner side in the direction.

When the lid 3 is supported by the lower receiving frame 16, as shown in FIGS. 7 and 8, the respective claws 8 are accommodated in the corresponding gaps 21 (see FIG. 6), and the one side surfaces of the respective claws 8 are opposed to each other. The lid 3 is rotated in one direction (in this embodiment, counterclockwise as viewed from above) until it contacts one side surface of the portion 7.
When each claw 8 is accommodated in the corresponding gap 21 and one side surface of each claw 8 is in contact with one side surface of the notch 7 facing each other, the lid 3 can no longer be rotated. Alternatively, as shown in FIG. 12, the handle 12 is pushed down until the lower surface (bottom surface) of the upper end portion of the handle 12 contacts the upper surface (surface) 22 of the lid 3.
When the handle 12 is pushed down to the state shown in FIG. 8 or FIG. 12, the hand is released from the handle 12, and as shown in FIGS. 9, 10, and 11, the baffle plate 18 is unidirectional (viewed from above in this embodiment). Rotate it counterclockwise) and drop it into the notch 7 (fit).
Note that the procedure for closing the opening 17 and removing the locked lid 3 from above the floor plate 5 to open the opening 17 is just the reverse of the above-described procedure, so the description thereof is omitted here. To do.

Here, FIG. 13 is a perspective view of the state shown in FIG. 12 viewed from below, and FIG. 15 is a perspective view of the state shown in FIG. 14 viewed from below. As shown in FIGS. 12 and 13, when the lower surface (bottom surface) of the upper end portion is in contact with the upper surface 22 of the lid body 3, the handle 12 can rotate the lid body 3 by grasping the handle 12 from below. As shown in FIGS. 14 and 15, the lower end portion of the lower end portion is in contact with the lower surface 9 of the lid body 3. The upper end portion of the lid 3 protrudes upward from the upper surface 22 of the lid 3 so that the lid 3 can be rotated by grasping the handle 12 from above.
As shown in FIGS. 6 and 11, the rotating shaft 19 of the baffle plate 18 always protrudes from the lower surface 9 of the lid 3, and the opening 17 is closed (closed) by the lid 3. It is configured so that it can be operated from below the floor plate 5 (so that the baffle plate 18 can be rotated).

According to the manhole opening / closing device 1 according to the present embodiment, the lid 3 supported by the lower receiving frame 16 is set at a predetermined angle (for example, about 2 to 20 degrees) in one direction (for example, counterclockwise as viewed from above). ) The claw 8 is rotated to be accommodated in the corresponding gap 21 to complete the closing operation of the hole 2, and the lid 3 supported by the lower receiving frame 16 is watched in the other direction (for example, viewed from above). The opening operation of the hole 2 is completed by lifting the lid 3 in a state where the claw 8 is rotated out of the corresponding gap 21 by being rotated a predetermined angle (for example, about 2 to 20 degrees).
Thereby, the hole 2 can be opened and closed without using a tool, and even when applied to a boiler such as an exhaust heat recovery boiler (HRSG), baking can be prevented.

Further, according to the manhole opening / closing device 1 according to the present embodiment, the baffle plate 18 is rotated and dropped (fitted) into the other end portion in the circumferential direction of the notch portion 7, whereby the nail 8 is pulled out from the gap 21. Thus, rotation of the lid 3 in the other direction (for example, clockwise as viewed from above) due to vibration or the like is prevented.
Thereby, it can prevent that the cover body 3 removes carelessly, and can prevent the opening of the hole 2 carelessly.

Furthermore, according to the manhole opening / closing device 1 according to the present embodiment, the lower receiving frame 16 is formed so that the curvature of the arc located on the inner peripheral side and the curvature of the arc located on the outer peripheral side are the same. Since it is a plate-like member having a substantially crescent moon shape in plan view, for example, as shown in FIG. 19, when a large number of lower receiving frames 16 are produced from a single plate material having a rectangular shape in plan view, If the arc to be cut is cut off, the arc located on the inner circumference side will be cut off, and if the arc located on the inner circumference side is cut off, the arc located on the outer circumference side will be cut off. Can be reduced as much as possible, and the manufacturing cost can be reduced.
When the lower receiving frame 16 is formed so that the curvature of the arc located on the inner circumferential side and the curvature of the arc located on the outer circumferential side are the same (see FIG. 19), the lower receiving frame 16 is cut out. The plate material having a rectangular shape in plan view required for the above is about 1/3 of the case where the lower receiving frame is made into a donut shape (see FIG. 16), and the lower receiving frame is divided into halves of the donut shape shown in FIG. About 1/3 of the case (see FIG. 17) is required, and about 2/3 of the case where the donut shape shown in FIG. 16 is divided into 1/3 (see FIG. 18).
In addition, when the lower receiving frame is manufactured by dividing the donut shape shown in FIG. 16 into 1/3 (see FIG. 18), the plate member having a rectangular shape in plan view necessary for cutting out the lower receiving frame 16 is formed by the lower receiving frame. It is about ½ of the donut shape (see Fig. 16), and the lower receiving frame is about ½ of the donut shape shown in Fig. 16 (see Fig. 17). It will be.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications and changes can be appropriately made as necessary without departing from the technical idea of the present invention.
For example, in the above-described embodiment, the description has been given by taking as one specific example the case where each of the three cutout portions 7 and the claw 8 is provided, but the present invention is not limited to this, and the cutout portion 7 and the claw 8 are provided. 2 or 4 or more may be provided.
Further, in the above-described embodiment, the description has been given by taking as an example the one provided with only one baffle plate 18, but the present invention is not limited to this, and other in the circumferential direction of each notch 7. You may make it each provide in the lower receiving frame 16 located under an edge part.

DESCRIPTION OF SYMBOLS 1 Manhole switchgear 2 Hole 3 Cover body 4 Receiving frame 5 Floor board 6 Circular part 7 Notch part 8 Claw 13 Upper surface 14 Upper receiving frame 15 Lower surface 16 Lower receiving frame 18 Baffle plate 21 Gap

Claims (3)

A circular portion having a substantially circular shape in plan view provided on the floor plate, and at least a rectangular shape in plan view or a substantially trapezoidal shape in plan view, which is cut outward from the circular portion at equal intervals in the circumferential direction. A manhole opening and closing device for opening and closing a hole provided with two notches,
A plate-like lid body that is accommodated inside the hole and closes the hole, and has a substantially circular shape in plan view, and a receiving frame that receives the lid body,
The lid is provided with a claw projecting outward at a position corresponding to the notch, and the receiving frame covers the upper end of one end in the circumferential direction of the notch. An upper receiving frame fixed to the upper surface of the lower plate, and a lower receiving frame fixed to the lower surface of the floor plate so as to cover the entire lower part of the notch,
A manhole opening and closing device, wherein a gap for accommodating the claw is provided between the upper receiving frame and the lower receiving frame.   A baffle plate that prevents the claw accommodated in the gap from coming out of the gap is rotatably attached to the lower receiving frame located below the other end in the circumferential direction of the notch. The manhole opening and closing device according to claim 1, wherein   The lower receiving frame is made of a plate-like member having a substantially crescent shape in plan view, formed so that the curvature of the arc located on the inner peripheral side and the curvature of the arc located on the outer peripheral side are the same. 3. The manhole opening / closing device according to claim 1 or 2, characterized in that:

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