JP2012219566A - Manhole emergency toilet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manhole emergency toilet having a simple western-style toilet bowl on a manhole buried at a place not interfering with traffic.SOLUTION: A manhole 10 made of concrete having a bottom plate 13 is buried at a place not interfering with traffic. Under normal conditions, an opening 19 in the square lid 11 of the manhole 10 is closed with a manhole lid 12 made of FRP. During an emergency when permanently-installed toilets cannot be used, the manhole lid 12 made of FRP is removed from the opening 19 for replacement with a toilet bowl 17 having a circular base plate 18, around which a vertically long dome type tent 23 is installed to form an interior space for the toilet. In addition, an air exhaust cylinder 10P for letting odor in the manhole out into atmosphere and a solar illumination lamp 30 for convenient use at night are included, so that a user-friendly manhole emergency toilet is provided.

Description

  The present invention relates to a manhole-type toilet (referred to as “emergency manhole toilet” in this specification) that can be used in an emergency where a disaster has occurred due to a natural disaster or the like.

  Patent Document 1 discloses an example of a temporary toilet in an emergency. This temporary toilet is temporarily installed by placing a Western-style simple toilet on an existing sewer manhole (hereinafter abbreviated as “existing manhole”) in the event of an emergency when a permanent toilet such as a home or public office cannot be used.

Japanese Patent No. 4025900

  However, the existing manhole is usually formed in the basement of the road on which automobiles and other means of transportation travel. Therefore, if a temporary toilet is installed on top of it, the temporary toilet will obstruct traffic and safety cannot be ensured. Will occur.

  In addition, natural disasters are not only transient, but often occur continuously and intermittently, and even a temporary toilet is desired to have a certain strength and installation stability. In addition, if the height of the internal space of the toilet is too low or too narrow, or if odor is accumulated in the internal space, the user becomes uncomfortable. Furthermore, there are cases where natural disasters continue at night or it takes time to recover from damage caused by natural disasters, and emergency situations may not be released, and it is desirable that the user can easily recognize the location of the temporary toilet even at night after sunset.

  In view of the above points, the present invention provides an emergency manhole toilet in which a manhole is embedded at a point that does not hinder traffic in an emergency, and a toilet bowl and other necessary members are arranged and fixed on the manhole. The purpose is to provide. Another object of the present invention is to provide a user-friendly emergency manhole toilet that can be used comfortably by the user.

(Aspect of the Invention)
The following items (1), (2) and (4) show aspects of the present invention corresponding to claims 1 to 3.

(1) An emergency manhole toilet using a toilet placed on a substrate having the same shape as an FRP manhole cover that closes the opening of the manhole, the manhole being installed on the bottom plate and the top surface of the bottom plate And a rectangular lid that closes the upper end of the cylindrical cylinder, and the rectangular lid includes a circular opening that is closed by the FRP manhole cover, and An emergency manhole toilet comprising a tent hooking portion, a handrail support portion, and a guide light support portion around the circular opening.

  According to the emergency manhole toilet in paragraph (1), in the event of an emergency in which a manhole with a bottom plate is buried underground in a safe place other than the road on which transportation such as automobiles travels, and the permanent toilet cannot be used The toilet bowl can be arranged by removing the manhole cover made of FRP that has closed the manhole. Further, preferably, the toilet bowl is surrounded by a vertically long dome-shaped tent with a certain space, thereby protecting the user's privateness and surpassing rain and wind to provide a comfortable internal space. The bottom plate, the cylindrical tube, and the rectangular lid plate constituting the manhole are made of concrete having excellent strength. The toilet bowl may be of either Western or Japanese style, but a Western style is preferred for comfort. A simple structure is desirable in terms of cost. The reason why the manhole cover is made of FRP instead of cast iron like that for sewerage is that the manhole cover can be reduced in weight while maintaining a certain strength, and the manhole cover can be easily removed and closed. Since the FRP has a certain flexibility, it can be snapped into the manhole opening.

  Moreover, since the emergency manhole toilet of (1) is equipped with the handrail support part, a handrail can be provided on both sides of the toilet using this handrail support part, and when the user sits on the toilet bowl or the toilet bowl It is possible to provide a user-friendly emergency manhole toilet equipped with a handrail that can be grasped when standing up. It is preferable that the handrail is fixed by being screwed to a rectangular lid plate with a bolt. When the toilet is not used, it is desirable to remove the handrail and store it separately.

  Moreover, since the emergency manhole toilet of (1) is provided with the guide light support part, it is preferable to support the solar guide light on the guide light support part, so that the emergency manhole toilet can be used in an emergency. The installation place can be easily confirmed. In addition, after installing the emergency manhole toilet, after sunset, the user can recognize the emergency manhole toilet without having a flashlight, and easily follow the emergency manhole toilet using the light of the solar guide light as a landmark. You can turn it on.

(2) The cylindrical cylindrical body includes an annular groove formed along the periphery of the upper end portion and an annular protrusion formed along the periphery of the lower end portion, and the bottom plate is fitted with the annular protrusion. A plurality of concentric annular grooves are provided, and the rectangular lid plate has a plurality of concentric annular protrusions fitted into the annular grooves of the cylindrical cylindrical body (1). Emergency manhole toilet as described in the section.

  According to the emergency manhole toilet of (2), since it is provided with a plurality of annular grooves and annular ridges as described above, for example, the manhole diameter is set according to the assumed use frequency, workability, etc. of the user. It is possible to switch to either one of 900 mm diameter and 1200 mm diameter.

  (3) The emergency manhole toilet according to (1) or (2), wherein the cylindrical tubular body is configured by stacking a plurality of cylindrical small tubular bodies.

According to this section, the number of cylindrical small cylinders to be stacked is adjusted according to the location of the emergency manhole toilet in (2), and the height of the cylindrical cylinder can be freely changed in the central axis direction. Can do.
According to this section, the height of the cylindrical tube can be freely changed. Further, according to this section, since the cylindrical cylindrical body can be constituted by a plurality of cylindrical small cylinders obtained by horizontally dividing the cylindrical cylindrical body, handling at the time of manufacture, transportation, etc. can be facilitated. Furthermore, when the horizontally divided cylindrical small cylinder is damaged or severely soiled, only that part can be replaced.

(4) The emergency manhole toilet according to any one of (1) to (3), wherein the cylindrical tubular body includes an exhaust pipe.
Since the emergency manhole toilet of (4) is equipped with an exhaust pipe, piping the exhaust pipe so as to communicate with the ground atmosphere from the manhole can release the odor in the manhole to the atmosphere. It is possible to prevent only the interior space of the manhole toilet from being filled with odor. Furthermore, a screw member is provided on the outer peripheral surface of the exhaust pipe near the open end on the atmosphere side, and a cap member provided with a screw part on the inner peripheral surface that can be screwed to the screw part is prepared. When not in use, the cap member can be removed from the exhaust pipe for cleaning, and when using an emergency manhole toilet, the cap member is screwed and screwed into the open end of the exhaust pipe so that it is sealed. can do.
Such an exhaust stack with a cap member can be used by making the part including the cap member protrude from the ground even after the ground structure such as a toilet bowl or tent seat is removed when the toilet is not used after the emergency is released. It also serves as a landmark for the manhole toilet.

(5) When the emergency manhole toilet is not used, the manhole opening is closed with an FRP manhole cover, and the rectangular manhole cover plate and the upper surface of the FRP manhole cover are used for other purposes. The emergency manhole toilet according to any one of (1) to (4).
In this section, “when the emergency manhole toilet is not in use” means, for example, when the lifeline is restored before the natural disaster occurs or after the natural disaster occurs, and each household or public toilet can be used normally. In such a case, a dome-type tent, an emergency western-style toilet, etc. are no longer necessary, these facilities are removed, and the manhole opening is closed with an FRP manhole cover to form the same plane as the ground surface. By doing in this way, the place can be used effectively as a flower bed, for example by arranging a planter at the place where the emergency manhole toilet is installed.
At this time, by providing the solar guide light of item (1) and the exhaust tube of item (3), the solar guide and the cap member of the exhaust tube have jumped out to the ground. Can be identified immediately and can be made known to the public so that it is immediately known that this is the location of the emergency manhole toilet. The installation worker can also remove the planter placed on the emergency manhole toilet and quickly install the emergency manhole toilet described in items (1) to (4).

  ADVANTAGE OF THE INVENTION According to this invention, the emergency manhole toilet which installed the toilet bowl on the manhole with a baseplate embed | buried in the safe place which does not obstruct traffic can be provided. In addition, according to the present invention, it is possible to provide a user-friendly emergency manhole toilet that can be easily installed in an emergency and can be easily recognized by the user after sunset.

1 shows a vertical cross-sectional view of an emergency manhole toilet according to a preferred embodiment of the present invention. It is a horizontal sectional view along the ground of the emergency manhole toilet according to a preferred embodiment of the present invention, (a) shows a toilet including a circular substrate when using the toilet, (b) when not using the toilet, The thing which closed the opening part of the manhole with the manhole cover instead of the toilet bowl is shown, (c) is a perspective view of one handrail installed beside the emergency manhole toilet. The solid perspective view of the emergency manhole toilet which concerns on suitable embodiment of this invention is shown. The solid perspective view which illustrated the Example when the said installation place is used effectively when the emergency manhole toilet which concerns on suitable embodiment of this invention is not in use is shown.

<Assembly and setting of emergency manhole toilet>
Hereinafter, a preferred embodiment of the emergency manhole toilet 1 until the setting is completed will be described with reference to FIGS. 1 and 2 separately for the underground structure 1U and the ground structure 1A existing on the ground GL.
FIG. 1 schematically shows a vertical section of an emergency manhole toilet 1 composed of an underground structure 1U and a ground structure 1A.
As can be seen from FIG. 1, the underground structure 1U is a structure of a manhole 10 buried under the ground GL, and includes a cylindrical cylindrical body 10C made of concrete, and a square cover made of concrete (rectangular cover plate). 11, an FRP manhole cover 12 (see FIG. 2B), and a concrete bottom plate 13. Such an underground structure 1U will be described later with reference to FIG. 4, but is buried in advance in a place where traffic is not hindered, such as in the vicinity of a park fence or fence.
As will be described later, the manhole cover 12 is used alternatively with the Western simple toilet bowl 17 with the circular substrate 18 (FIG. 2B).

  In the present embodiment, the cylindrical tubular body 10C, the square lid 11 and the bottom plate 13 are made of concrete. This is because the concrete before hardening is easy to form along the mold, and it is easy to form the structure of the cylindrical tube body 10C, the square lid 11 with the opening 19, and the circular plate-like bottom plate 13. Further, the hooks F1 to F4 that are the hooking portions of the tent sheet 23 ″ of the step 10L, the handrails 22R and 22L, and the dome-shaped tent 23 are attached simultaneously with the concrete molding or after the concrete molding.

Further, an approximately L-shaped exhaust cylinder 10P is fixed substantially perpendicular to the side wall surface of the cylindrical cylinder 10C. Furthermore, when explaining the manner of mounting the exhaust pipe 10P, the one end opening end portion 10P ₁ of the exhaust pipe 10P is below the ground surface GL, and penetrates substantially perpendicularly to the upper portion of the cylindrical sidewall 10W of the cylindrical tubular body 10C It is arranged to, the other opening end portion 10P ₂ are arranged so as to protrude above the ground GL. Furthermore, it is provided a cap member 10P ₃ which is screwed into the other end side open end 10P _2. The cap member 10P _3, is removed from the other end side opening end portion 10P _2, while it is possible to clean the cap member 10P _3, when screwed into the other end opening end portion 10P ₂ of the cap member _{P 3,} rain In addition, it is possible to prevent odors from entering the manhole 10 and conversely odors.

The inner diameter of the cylindrical cylinder 10C is determined according to the manhole diameter. For example, the inner diameter of the cylindrical cylinder 10C is preferably a 900 mm diameter manhole or a 1200 mm diameter manhole. Further, the height of the cylindrical cylinder 10C is preferably about 2300 mm to 2500 mm. The emergency manhole toilet 1 is basically only for emergencies, and does not need to be unnecessarily enlarged or deepened from the viewpoint of installation workability, assumed usage frequency, material cost, etc., and picks up cleaning and falling objects For this purpose, it is sufficient if there is enough space for workers to enter.
The cylindrical cylinder 10C is configured by stacking a plurality of cylindrical small cylinders according to the installation location. For example, it is possible, as shown in FIG. 1, the facing surfaces to be cut in a horizontal line shown by reference numeral 10C ₁ and 10C ₂ and the boundary 3 is divided. At this time, the cylindrical tubular body 10C is opposed surfaces of the portion indicated by reference numeral 10C ₁ and 10C ₂ are, is formed an annular groove along its periphery on one of the opposed surfaces, and, on the other opposing surface An annular ridge that can be fitted into the annular groove is formed along the periphery. When the emergency manhole toilet 1 is installed, a plurality of cylindrical small cylinders constituting the cylindrical cylinder 10C are stacked, and the respective annular grooves and the respective annular protrusions of the respective cylindrical small cylinders are fitted. Thus, the side wall of the cylindrical cylinder 10C can be produced.

  Furthermore, the cylindrical cylinder body 10C is provided with a plurality of steps 10L at predetermined intervals in which the worker can safely move up and down in the depth direction. Step 10L is preferably made by inserting two ends of a stainless steel pipe member bent into a U-shape substantially perpendicularly to the concrete wall surface of the cylindrical tube 10C and hardening the concrete. It is fixed and formed so that it does not come off even if an operator gets on it.

Further, an annular groove 16 'is provided along the periphery of the upper end surface of the cylindrical cylinder 10C, and an annular protrusion 16 is provided along the periphery of the lower end surface. The square lid 11 is provided with an annular protrusion 15-1 and the bottom plate 13 is provided with an annular groove 13-1.
At this time, the annular ridge 15-1 is fitted into the annular groove 16 ', and the annular ridge 16 is formed to be fitted into the annular groove 13-1, and thereby the cylindrical cylinder 10C is formed. The square lid 11 and the bottom plate 13 are positioned.
As can be seen from FIG. 1, the bottom plate 13 has an annular groove 13-2 having a smaller diameter than the annular groove 13-1, and the square lid 11 has an annular protrusion 15- having a smaller diameter than the annular protrusion 15-1. 2 is formed. In this way, a plurality of annular grooves and annular ridges are formed concentrically on the square lid 11 and the bottom plate 13, and an annular ridge and an annular groove (not shown) having a diameter corresponding to the cylindrical cylindrical body 10C side. By forming it, the manhole diameter can be switched as desired.

The square lid 11 will be described with reference to FIGS.
The square lid 11 is a plate-like member made of concrete having a constant thickness with four corners chamfered and having a substantially square horizontal cross section, and a circular substrate 18 fixed under the Western simple toilet 17 is provided at the center thereof. An opening 19 that has substantially the same outer surface as that of the object and can be closed with an FRP manhole cover 12 is formed. More specifically, the rectangular lid 11 has a substantially L-shaped vertical section of the peripheral portion 11E surrounding the opening 19. The inner peripheral portion 11E ₁ of the substantially L-shaped surrounding portion 11E has a manhole cover 12 or the circular substrate 18 having a substantially equal outer diameter size, respectively, at the time or use toilet nonuse, exchange, fittable In addition, an annular step 20 is formed to prevent the manhole cover 12 or the circular substrate 18 from falling. Further, a protrusion 18P having a T-shaped cross section that can be closed by snapping onto the stepped portion 20 of the square lid 11 is formed in a vertical and annular shape at the bottom of the western-style simple toilet 17.

Furthermore, handrails 22L and 22R are installed on both sides of the Western style toilet bowl 17 on the square lid 11. The handrails 22L and 22R are auxiliary means required when the user easily stands up from the Western simple toilet 17 or sits there. Therefore, the handrails 22L and 22R are set to a height that is easy for the user to grasp. The handrails 22L and 22R may be formed by bending a stainless steel pipe into a substantially U shape, for example, and the diameter is preferably a diameter that can be easily grasped by the user.
Further, as shown in FIG. 2 (c), rectangular plates with through holes 22H through which predetermined bolts (not shown) can be passed at both lower ends where the handrails 22L and 22R are fixed to the square lid 11. Are attached so as to be perpendicular to the longitudinal direction of the handrails 22L and 22R of the mounting plates 22L 'and 22R'. Further, as shown in FIG. 2B, the square lid 11 has a screw hole 40 at a location corresponding to the through hole 22H, corresponding to the location where the mounting plates 22L 'and 22R' are installed on the square lid 11. -43, 40'-43 'are formed.
Then, the mounting plates 22L ′ and 22R ′ are aligned on the square lid 11, the bolts are passed through the screw holes 40 to 43 and 40 ′ to 43 ′, and the screw holes 40 to 43 and 40 ′ to 43 ′ are inserted. The handrails 22L and 22R can be attached to the square lid 11 by screwing bolts.

As can be seen from FIG. 2, the lower end of the tent sheet 23 ″ of the dome-shaped tent 23 is hooked on the square lid 11 at a position slightly inward from the four corners of the square lid 11 and diagonally. Four hooks F1 to F4 having a U-shaped cross section functioning as possible latching portions are provided.
These hooks F1 to F4 are provided with recesses h1 to h4 at suitable locations around the end of the square lid 11, and further embedded in the recesses h1 to h4 so that the tops of the hooks F1 to F4 do not protrude from the ground GL. Is provided.
In addition, the square lid 11 is provided with a mounting portion 32 for the guide light support portion 31 for the solar guide light 30 at a position where the installation position of the emergency manhole toilet 1 can be easily recognized.

  The manhole cover 12 (especially, see FIG. 2B) is a cover that closes the opening 19 of the square cover 11 when the emergency manhole toilet 1 is not used for a long period of time. The manhole cover 12 is preferably provided with a grip handle (not shown) at the center thereof for the convenience of removal when an emergency occurs again.

Next, the Western simple toilet 17 of the ground structure 1A will be described with reference to FIGS.
Before starting the use of the toilet, the manhole cover 12 is removed from the opening 19 of the square lid 11, and a Western-style simple toilet 17 with a circular substrate 18 is installed in the opening 19 (see FIG. 2A). At this time, the two handrails 22L, so that the center of the opening 19 (see FIG. 1) of the square lid 11 and the center of the opening 17H (see FIG. 1) of the western simple toilet 17 are substantially collinear. A Western-style toilet bowl 17 having a circular base plate 18 having an opening 17H having the same diameter as that of the manhole cover 12 in the center is installed in the middle of 22R. The Western simple toilet 17 may be a commercially available Western simple toilet made of resin that is preferably lightweight and relatively robust. Of course, those skilled in the art can appropriately change them, and Japanese-style ones may be used instead of Western ones.

Next, the dome-shaped tent 23 that functions as a partition with the outside of the ground structure 1A, rain wind prevention, and the like will be described below with reference to FIGS. 1, 2A, and 3 as appropriate.
Referring to FIG. 3, the dome-shaped tent 23 is a tent having a vertically long dome-shaped tent for a commercial camp, and is flexible and has four tent poles that return to their original shape when bent. 23 'and a tent sheet 23 ". Each of the four tent poles 23 ′ is passed through pipe portions (not shown) formed in a substantially reverse parabolic shape and a bag shape at four locations on the inner surface of the tent sheet 23 ″, thereby forming a substantially reverse parabolic shape. It is bent to form wall portions (portions indicated by reference numeral 23 ″ in FIG. 3) existing in four substantially reverse parabolic four directions of the dome-shaped tent 23.

  As shown in FIG. 3, a fastener 25 is provided at a portion of the tent sheet 23 ″ that is the front portion of the emergency manhole toilet 1, and the front portion of the emergency manhole toilet 1 is used by the user. Open and close when leaving the room. Further, as shown in FIG. 3, in a state where the fastener 25 is raised to the upper end and fixed, the end of the tent sheet 23 ″ including the fastener 25 is gripped or rounded and the flexible pole 23 is folded. The open and closed state can be fixed by two pairs of cords 26 on the left and right sides that can be fastened at an appropriate position.

  The dome-shaped tent 23 assembled as described above is placed on the square lid 11, and the tent sheet 23 ″ is hooked on the hooks F1 to F4 using the hooking ropes N1 to N4 and fixed to the square lid 11. . The hanging ropes N1 to N4 may be carabiner-shaped (not shown).

  According to the above-described embodiment, the emergency manhole toilet can be temporarily installed in a safe place without hindering traffic without using an existing manhole. In addition, the emergency manhole toilet 1 is made of concrete and is strong, so it can be used safely for a certain long time although it is temporary.

<Embodiment of emergency manhole toilet>
FIG. 3 is a three-dimensional perspective view showing an embodiment of the emergency manhole toilet 1 assembled by the above method. With reference to FIG. 3, the emergency manhole toilet 1 in a state where the temporary construction has been completed will be described. The content overlapping with the above description is omitted as appropriate.

The emergency manhole toilet 1 has a ground-type structure 1A, a western-style toilet 17 inside a tent sheet 23, handrails 22L and 22R on both sides thereof, and a tent sheet that covers the Western-style toilet 17 and the handrails 22L and 22R. It is surrounded by 23 and has an appearance like a simple public toilet in a park, and is easy to use as well.
Ground and a part and the cap member 10P ₃ exhaust pipe 10P projecting from, also, solar induction lamp 30 is installed on the guide light support portion 31 slightly provided toward the front of the left top portion of Sumifuta 11 .

The underground structure 1U, the inner wall of the cylindrical tubular body 10C of the bottom 13 with a manhole 10 of a concrete, step 10L is provided, and one end opening end portion 10P ₁ of the exhaust pipe is provided through Yes.
The emergency manhole toilet 1 is not easily damaged even when natural disasters occur continuously and intermittently in an emergency because the lower structure 1U is made of concrete.

Further, since the emergency manhole toilet 1 is provided with an exhaust tube 10P, when the cap member 10P ₃ soiled can be cleaned by removing the cap member 10P _3, also emergency manhole toilet Sometimes, odors to the internal space surrounded by the tent sheet 23 can be released into the atmosphere. In addition, the emergency manhole toilet 1 is equipped with a solar guide light 30 so that the place where the emergency manhole toilet 1 is installed can be easily confirmed. Even if there is no flashlight after sunset, the user can It is easily guided to the emergency manhole toilet 1. Further, as shown in FIG. 3, since the solar guide light 30 is near the front, the user can easily recognize the entrance of the emergency manhole toilet 1.
When the emergency situation is prolonged, it is desirable to insert a vacuum car hose from the opening 17H of the Western-style simple toilet 17 to discharge the internal items to some extent periodically from the viewpoint of hygiene or comfortable use.

On the other hand, when the emergency situation ends and the lifeline is restored, the user no longer uses the normal toilet. Therefore, in the emergency manhole toilet 1, it is desirable to remove the equipment related to the ground structure 1A described with reference to FIG.
However, it is necessary to keep the position of the emergency manhole toilet 1 known even after returning to normal.
Therefore, as shown in FIG. 4, the solar guide lamp 30 and the guide support portion 31, a part of the exhaust pipe 10 </ b> P, and the cap portion 10 </ b> P <b> ₃ are projected from the ground surface.
Then, as shown in FIG. 2B, a manhole cover 12 made of FRP is fitted into the square cover 11, so that humans, animals, objects, etc. are not accidentally dropped.

Further, as shown in FIG. 4, for example, a set of four planters 33 is placed on the square lid 11 fitted with the FRP manhole cover 12, and flowers are planted on the planter 33 to form a flower bed. It is preferable to do.
According to this aspect, the installation place after the removal of the emergency manhole toilet 1 can be effectively used, and the FRP manhole cover 12 and the square cover 11 can be covered, and the installation place is particularly suitable for a park. It can contribute to the beautification of the park during normal times.

In addition, this invention is not limited to the said Example, Of course, a various change can be added in the range which does not deviate from the summary of this invention. For example, in the above embodiment, toilet paper can be provided near the simplified Western-style toilet 17. At this time, the core of the toilet paper may be fixed to the handrails 22R and 22L.
Moreover, the solar induction lamp 30 may be installed also in the top part of the emergency manhole toilet 1, for example, and four solar induction lamps 30 instead of one may be prepared and provided in the four corners. In this way, the emergency manhole toilet 1 can be recognized from many directions.
The fabric of the tent sheet 23 ″ may be a general-purpose camping tent fabric. For example, a durable fabric having both water repellency and breathability such as Teflon (registered trademark) and Thinsulate (registered trademark). Can be used.

1: emergency manhole toilet, 10: manhole, 10C: cylindrical tube, 11: rectangular lid plate, 12: FRP manhole cover, 13: bottom plate, 17: toilet, 18: substrate, 19: circular opening, F1, F2, F3, F4: latching portions (hooks), 22R, 22L: handrails, 31: guide light support portions.

Claims (3)

An emergency manhole toilet that uses a toilet placed on a substrate of the same shape as the FRP manhole cover that closes the opening of the manhole,
The manhole is composed of a bottom plate, a cylindrical tube installed on the upper surface of the bottom plate, and a rectangular lid plate that closes the upper end of the cylindrical tube,
The rectangular lid plate includes a circular opening that is closed by the FRP manhole cover, and a tent hanging hook, a handrail support, and a guide light support around the circular opening. And an emergency manhole toilet. The cylindrical cylinder includes an annular groove formed along the upper edge and an annular protrusion formed along the lower edge.
The bottom plate includes a plurality of concentric annular grooves into which the annular protrusions are fitted, and
2. The emergency manhole toilet according to claim 1, wherein the rectangular lid plate includes a plurality of concentric annular ridges that are fitted into an annular groove of the cylindrical tubular body.   The emergency manhole toilet according to claim 1 or 2, wherein the cylindrical tube body includes an exhaust tube.

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