JP5555658B2 - Drainage device for underground structures - Google Patents

Description

  The present invention relates to a technique for a drainage device for an underground structure, and more particularly, to a drainage device for an underground structure that discharges accumulated water in the underground structure to the outside of the underground structure.

  Conventionally, as a method for embedding various wirings for power, communication, etc. in the ground, methods such as a pipe line type, a culvert type, and a direct buried type have been adopted. In general, this method involves opening and piping as a joint structure through which wiring is routed, underground burying boxes that branch and aggregate wiring, and wiring entry / extraction / connection within the underground burying box. Underground structures such as manholes for workers to enter and exit from the ground to work are buried in the ground.

  In the above-mentioned underground structure, when the installation position is lower than the water level, water flows into the underground structure from the ground surface, and the water is stored inside, especially within a short time such as when heavy rain falls. When a large amount of rainwater flowed into the underground structure, the accumulated water in the underground structure eventually flowed out (overflow) onto roads and sidewalks on the ground surface. In addition, in the underground burial box as the above-mentioned underground structure, an operator enters the manhole from the manhole for periodic inspections, replacement of wiring, and additional wiring. Such work is difficult if there is stored water above the predetermined water level.

  At present, every time the above situation occurs, take the machinery and equipment necessary for drainage work such as drainage pumps and generators to the site, and drain the accumulated water in the underground structure outside the machine. Has been done. However, such drainage work requires the work of bringing in machinery and equipment necessary for drainage, personnel deployment required for the work, and security and hygiene security measures for the workers. From the viewpoint of improvement and labor cost improvement, proposals for new drainage structures and drainage systems for underground water in underground structures are in demand.

  In view of the current situation as described above, the drainage structure and drainage device for underground water in the underground structure have been described so far. For example, as disclosed in Patent Document 1, the underground structure (drainage structure) is formed on the inner wall. As a structure of an underground structure in which a drainage hole communicating with an internal space and an external space is drilled, or as a drainage device previously installed in the underground structure as disclosed in Patent Document 2, the outside of the machine An apparatus having a diaphragm pump connected to an extended pipe member has been proposed.

JP 2000-303546 A JP 2002-335611 A

  However, in the drainage structure disclosed in Patent Document 1 described above, the water stored in the underground structure is drained into the roadbed outside the machine by drainage holes formed through the side wall of the underground structure (drainage structure). However, in such a structure, since the hole is only perforated in the side wall, for example, when the soil on the side of the roadbed is water-permeable soil, In addition to being discharged out of the machine, the water in the roadbed may flow into the underground structure from the side of the drainage hole.

  In addition, the structure of the drainage device disclosed in Patent Document 2 can be expected to reduce size and power consumption compared to conventional drainage pumps and improve maintainability by using a diaphragm pump. When such a diaphragm pump breaks down, the drainage capacity is immediately stopped. Therefore, in order to maintain the constant drainage capacity by operating the diaphragm pump stably, it is still indispensable to perform regular maintenance work. That is, in the configuration of such a drainage device, there still remains a problem that drainage capacity is stopped due to a failure and a burden of maintenance work.

  Therefore, the present invention relates to a drainage device for an underground structure, which solves the above-described conventional problems, and can drain the accumulated water in the underground structure with a simple configuration and can stably drain water. The purpose is to propose.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, in claim 1, in the drainage device for an underground structure that discharges the accumulated water in the underground structure to the outside, it is fitted into a through hole formed in the side wall of the underground structure, With a horizontal pipe part arranged in the horizontal direction with the outside facing the outside of the underground structure, and with the horizontal pipe part connected in an internal communication manner, with the opening end part arranged vertically in the downward direction of the underground structure. A vertical pipe provided, and a non-return which is provided at an opening end of the vertical pipe and closes the opening and opens the opening when the water level in the underground structure rises It comprises a valve mechanism and a water filtration member disposed at the open end of the horizontal tube portion .

  According to a second aspect of the present invention, the check valve mechanism can move up and down in an inflow hole formed in an inflow hole communicating with the outer space and the inner space of the vertical pipe portion, and the inflow hole of the valve seat portion. And a valve portion provided at an end portion of the guide portion that protrudes into the longitudinal tube portion, and the valve portion abuts on the valve seat portion so that the inflow hole is formed. When the valve portion is closed and interlocked with the guide portion, the valve portion is separated from the valve seat portion and the inflow hole is opened.

  According to a third aspect of the present invention, a part or all of the guide portion is formed from a buoyancy member.

  As an effect of the present invention, the stored water in the underground structure can be stably drained with a simple configuration.

It is the figure which showed the structure of the underground structure where the drainage apparatus which concerns on one Example of this invention is used. It is the side view which showed the whole structure of the drainage apparatus which concerns on one Example of this invention. It is sectional drawing of a drainage device. It is an AA arrow line view in FIG. It is sectional drawing at the time of check valve mechanism closing. It is sectional drawing at the time of non-return valve mechanism opening. It is sectional drawing at the time of non-return valve mechanism maximum opening.

  Next, modes for carrying out the invention will be described.

First, the overall configuration of the drainage device 1 of the present embodiment will be outlined below.
As shown in FIG. 1, the underground structure 100 in which the drainage device 1 of the present embodiment is used is an underground structure group for undergrounding various power and communication wirings. It is installed and used in manholes for workers to enter and exit from the ground in order to carry in, pull out and connect wiring in the buried box 102. It is used to prevent the accumulated water in the object 100 from flowing out (overflowing) onto the road or sidewalk on the ground surface G.

  As an underground structure group of the present embodiment, a pipe rod 101 in which wirings are laid is installed in the ground surface G, and an underground burial box 102 is provided in the middle of the pipe rod 101 at predetermined intervals. -102 ... are arranged. And the manhole (underground structure 100) opened to the ground surface G is connected to the upper part of each underground burying box 102, and an operator can go in and out of the underground burying box 102 from the manhole (underground structure 100). Has been.

  As shown in FIGS. 2 and 3, the drainage device 1 of the present embodiment is fitted into the through hole 100 b formed in the side wall 100 a of the above-described underground structure 100, and the outer opening end portion 10 a is connected to the underground structure. The horizontal pipe portion 10 is arranged in the horizontal direction toward the outside of the 100, and is connected to the horizontal pipe portion 10 in an internal communication manner, and the lower opening end portion 11a is arranged in the vertical direction toward the lower side of the underground structure 100. The vertical pipe portion 11 provided and the lower opening end portion 11a of the vertical pipe portion 11 closes the lower opening end portion 11a, and when the water level in the underground structure 100 rises, the lower opening end portion And a check valve mechanism 2 that opens 11a.

  In the drainage device 1 of the present embodiment, the horizontal tube portion 10 and the vertical tube portion 11 that are hollow internal tubular members are integrally connected, and the horizontal tube portion 10 and the vertical tube portion 11 are continuously connected in an internal communication manner. ing. And the drainage device 1 is installed in the underground structure 100 in a state in which the horizontal pipe part 10 is fitted in a through hole 100b formed in the side wall 100a of the underground structure 100, and in this state, the horizontal pipe part 10 Is arranged in the horizontal direction with respect to the underground structure 100, and the vertical pipe portion 11 is arranged in the vertical direction with respect to the underground structure 100.

  The horizontal tube portion 10 is a straight tubular member having both ends opened, and the drainage device 1 is installed on the underground structure 100, and the outside of the underground structure 100 (external space outside the side wall 100a). ) And an inner opening end 10b that opens toward the inside of the underground structure 100 (an inner space inside the side wall 100a). As described above, the drainage device 1 is installed with the outer opening end 10 a facing the outside of the underground structure 100 and the inner opening end 10 b facing the inside of the underground structure 100.

  A filtering member 12 is disposed at the outer opening end 10a so as to close the opening. As will be described later, the filtering member 12 is composed of a member having a function of filtering the water in the horizontal pipe portion 10 drained to the outside through the outer opening end portion 10a. For example, a spherical natural stone or a spherical shape is used. A porous filter or a sheet-like filter formed by forming a chemical fiber such as polyester or polypropylene into a sheet is used. In the filter member 12 of the present embodiment, spherical porous ceramics are used as the filter medium, and the one accommodated in a net bag is used.

  A cap member 13 is detachably attached to the inner opening end portion 10b, and the inner opening end portion 10b is closed by the cap member 13. In the cap member 13 of the present embodiment, a long bar-shaped pushing member 13a is projected from an end surface facing the inner direction of the inner opening end portion 10b. When the cap member 13 is attached to the inner opening end portion 10b, the pushing member 13a is inserted into the lateral tube portion 10 and extends toward the outer opening end portion 10a with the cap member 13 attached. . By this pushing member 13a, for example, the filtration member 12 inserted into the horizontal tube portion 10 can be pressed from the inner opening end portion 10b and moved in the direction of the outer opening end portion 10a, and the outer opening end portion 10a. It is possible to fix the filtration member 12 disposed in the inner tube 10 so that it does not fluctuate in position within the horizontal tube portion 10 by pressing.

  On the outer surface of the horizontal tube portion 10, water-stop members 14 are attached at predetermined locations (two locations in the present embodiment). With the water blocking member 14, the inner wall of the through hole 100b and the outer surface of the horizontal tube part 10 are separated from each other in a state where the horizontal tube part 10 is inserted into the through hole 100b formed in the side wall 100a of the underground structure 100. Sealed. The water stop member 14 is formed of a flexible member such as water expansion rubber. In particular, it is preferable to use a water-expandable rubber as the water-stopping material 14 because an excellent water-stopping effect can be expected by double water-stopping by self-filling voids by self-volume expansion in addition to sealing by rubber elasticity.

  The vertical tube portion 11 is a linear tubular member having both ends opened, and is connected to a position in the vicinity of the inner opening end portion 10b of the horizontal tube portion 10 so as to be continuously communicated with the horizontal tube portion 10. Yes. The vertical pipe portion 11 of the present embodiment is a lower opening that is located on the inner side of the underground structure 100 and is opened toward the lower side of the underground structure 100 in a state where the drainage device 1 is installed in the underground structure 100. An end portion 11a is formed. As described above, when the drainage device 1 is installed in the underground structure 100, the interior of the underground structure 100 is provided via the outer opening end portion 11 a of the horizontal tube portion 10 and the lower opening end portion 11 a of the vertical tube portion 11. The space and the external space are in communication.

Next, the configuration of the check valve mechanism 2 will be described in detail below.
As shown in FIGS. 3 to 5, the check valve mechanism 2 is provided at the lower opening end portion 11 a of the vertical pipe portion 11 described above, and closes the lower opening end portion 11 a, and the water level in the underground structure 100. Is configured to open the lower opening end portion 11a. Specifically, the cap member 20 is detachably attached to the lower opening end portion 11a, and the external space and the internal space of the vertical tube portion 11 Projecting into the longitudinal tube portion 11 of the guide portion 22, the valve seat portion 21 having an inflow hole 21 b communicating therewith, a guide portion 22 inserted through the inflow hole 21 b of the valve seat portion 21 so as to be movable up and down. It is comprised with the valve part 23 grade | etc., Provided in the edge part of the side.

  The cap member 20 is detachably attached to the lower opening end portion 11a of the vertical pipe portion 11, and the valve seat portion 21, the guide portion 22, and the valve portion 23 described above are supported on the cap member 20. The cap member 20 includes a thin disk-shaped base part 20a, a standing wall part 20b standing on an end surface facing the inner direction of the lower opening end part 11a of the base part 20a, and a lower opening of the base part 20a. The operation piece portion 20c is erected on the end surface facing the outside of the end portion 11a.

  A circular through hole 20d that communicates the external space and the internal space of the vertical tube portion 11 is formed in the center portion 20a, and a guide portion 22 described later is inserted into the through hole 20d so as to be movable up and down. The The through hole 20d is formed so that the inner diameter is larger than the inner diameter of the guide portion 22, and the inner surface of the through hole 20d and the outer surface of the guide portion 22 in a state where the guide portion 22 is inserted into the through hole 20d. A gap is formed between the two. By forming such a separation, not only can the guide portion 22 move up and down in the through-hole 20d in a state where the guide portion 22 is inserted into the through-hole 20d, but also the underground through the separation as described later. The stored water in the structure 100 can flow into the vertical pipe portion 11.

  Further, the standing wall portion 20b has a threaded portion threaded on the outer surface, and is screwed with a threaded portion threaded on the inner surface of the mounting member 11b inserted into the lower opening end portion 11a. The cap member 20 is detachably attached to the lower opening end portion 11a through the attachment member 11b. The operation piece 20c is a piece that is gripped by an operator when the cap member 20 is attached or detached.

  Thus, in the drainage device 1 of the present embodiment, in the check valve mechanism 2, the valve seat portion 21 and the guide portion 22 described above are attached to the cap member 20 that is detachably attached to the lower opening end portion 11a of the vertical pipe portion 11. Since the valve portion 23 is configured, the check valve mechanism 2 can be attached to and detached from the vertical tube portion 11 by attaching and detaching the cap member 20, and the check valve mechanism 2 is easily maintained. Can do.

  The valve seat part 21 is formed in a thin disk-shaped member, and is attached to the end part of the standing wall part 20b of the cap member 20 described above. The valve seat portion 21 has a horizontal contact surface 21a formed on one surface, and is attached to the cap member 20 so that the contact surface 21a faces the inner direction of the lower opening end portion 11a. Further, the valve seat portion 21 is formed with a circular inflow hole 21b communicating with the outer space and the inner space of the vertical tube portion 11 in the center portion. The inflow hole 21b is formed so as to be coaxial with the through hole 20d formed in the base portion 20a of the cap member 20 described above, and a guide portion 22 described later is inserted so as to be movable up and down.

  The inflow hole 21b is formed so that the inner diameter is larger than the inner diameter of the guide portion 22, and the inner surface of the inflow hole 21b and the outer surface of the guide portion 22 in a state where the guide portion 22 is inserted into the inflow hole 21b. A gap is formed between the two. By forming such a separation, not only can the guide portion 22 move up and down in the inflow hole 21b in a state where the guide portion 22 is inserted into the inflow hole 21b, but also the underground through the separation as described later. The stored water in the structure 100 can flow into the vertical pipe portion 11.

  Note that the through hole 20d and the inflow hole 21b are suitably designed so that the distance from the guide member 22 can stably move the guide member 22 up and down without impairing the drainage capacity of the check valve mechanism 2. The That is, if the separation distance from the guide member 22 is short (the opening areas of the through holes 20d and the inflow holes 21b are small), the drainage capacity of the stored water in the underground structure 100 is reduced, while the separation distance is long (through holes). This is because the vertical movement of the guide member 22 is not stable.

  The guide portion 22 is formed of a long rod-like member having a circular cross section, and is inserted through the through hole 20d of the cap member 20 (base portion 20a) and the inflow hole 21b of the valve seat portion 21 so as to be movable up and down. The guide portion 22 is provided with a valve portion 23 to be described later at an end portion of the valve seat portion 21 that protrudes into the vertical tube portion 11 from the inflow hole 21b, and on the other hand, a through hole of the cap member 20 (base portion 20a). A latch member 24 is provided at the end of 20d that protrudes out of the vertical tube 11.

  As will be described later, a part or all of the guide portion 22 is formed of a buoyancy member 25 having a specific gravity lighter than that of water so that the guide portion 22 is moved upward by receiving buoyancy due to the accumulated water in the underground structure 100. The guide part 22 of the present embodiment is formed by an internal hollow tubular member, and a buoyancy member 25 is embedded in the internal hollow. As the buoyancy member 25, for example, a general-purpose foamed polyurethane material or a closed-cell sponge material is used.

  The valve portion 23 is formed in a thin disk shape having a radial length smaller than the inner diameter of the vertical tube portion 11, and is connected to the end portion of the guide portion 22 at the center portion. The valve portion 23 is arranged such that a horizontal contact surface 23a is formed on the outer surface of the lower opening end portion 11a, and the contact surface 23a is located opposite to the contact surface 21a of the valve seat portion 21. It is installed. The valve portion 23 is formed so that the contact surface 23a can be brought into close contact with the contact surface 21a of the valve seat portion 21, and the valve portion 23 is formed on the contact surface 21a of the valve seat portion 21 as described later. When the contact surface 23a is contacted, the contact surface 23a of the valve portion 23 closes the inflow hole 21b of the valve seat portion 21 and closes the lower opening end portion 11a.

  The latching member 24 projects radially from the outer surface of the end portion of the guide portion 22, and when the guide portion 22 is moved upward, the latching member 24 is attached to the base portion 20 a of the cap member 20. The guide part 22 is latched by contact | abutting (refer FIG. 7).

  The valve portion 23 is connected to the end portion of the guide portion 22 so that the valve portion 23 is moved up and down in an integrated manner with the guide portion 22. In the present embodiment, the valve portion 23 is moved down by its own weight, and in the underground structure 100. It is lifted by receiving buoyancy from the accumulated water. The lowest position of the valve portion 23 is regulated by the contact surface 23a of the valve portion 23 being brought into contact with the contact surface 21a of the valve seat portion 21 (see FIG. 5). The moving position is regulated by the contact of the latch member 24 of the guide portion 22 with the base portion 20a of the cap member 20 (see FIG. 7).

Here, the operation of the check valve mechanism 2 will be described in detail below with reference to FIGS.
As shown in FIG. 5, when there is no accumulated water in the underground structure 100 or when the level of the accumulated water in the underground structure 100 is lower than the installation position of the drainage device 1, the valve portion 23 is at the maximum. The valve portion 23 is in contact with the valve seat portion 21, the inflow hole 21 b is closed, and the lower opening end portion 11 a of the vertical tube portion 11 is closed. In such a state, the internal space and the external space of the underground structure 100 are blocked in the drainage device 1. For example, even if water outside the apparatus flows into the horizontal pipe portion 10 from the outer opening end portion 10 a, the water remains It is not discharged into the underground structure 100 from the lower opening end portion 11 a of the vertical pipe portion 11.

  As shown in FIG. 6, water flows into the underground structure 100 from the ground surface G and is stored therein, and the water level in the underground structure 100 rises to increase the installation position of the drainage device 1 (return check). When the valve mechanism 2 is disposed), buoyancy is generated in the guide portion 22 due to the accumulated water, and the guide portion 22 and the valve portion 23 start to move upward. When the valve part 23 is moved upward from the lowest position, the valve part 23 is separated from the valve seat part 21 and the inflow hole 21b is released, and the lower opening end part 11a of the vertical pipe part 11 is released. . In such a state, the accumulated water in the underground structure 100 flows into the drainage device 1 (vertical pipe portion 11) through the through hole 20 d of the cap member 20 and the inflow hole 21 b of the valve seat portion 21.

  Then, as shown in FIG. 7, when the water level in the underground structure 100 further rises, the latching member 24 of the guide portion 22 is brought into contact with the base portion 20 a of the cap member 20 and the valve portion. The uppermost movement position of 23 is regulated, and the upward movement of the guide part 22 and the valve part 23 is stopped. In such a state, the water that has flowed into the drainage device 1 flows into the horizontal tube portion 10 from the vertical tube portion 11, and is discharged out of the machine from the outer opening end portion 10 a of the horizontal tube portion 10.

  As described above, the drainage device 1 of this embodiment is drilled in the side wall 100a of the underground structure 100 in the underground structure drainage device 1 that discharges the accumulated water in the underground structure 100 to the outside of the underground structure. A horizontal tube portion 10 that is fitted in the through-hole 100b and is disposed laterally with the outer opening end portion 10a facing the outside of the underground structure 100, and is continuously connected to the horizontal tube portion 10 in an internal communication manner. The opening end portion 11a is provided in the vertical pipe portion 11 disposed in the vertical direction with the underground structure 100 downward, and the lower opening end portion 11a of the vertical pipe portion 11 is closed, and the lower opening end portion 11a is closed. The check valve mechanism 2 that opens the lower opening end portion 11a when the water level in the underground structure 100 rises, so that the stored water in the underground structure has a simple configuration. Can be drained stably.

  That is, the drainage device 1 of the present embodiment is used for fitting in a through hole 100b drilled in the side wall 100a of the underground structure 100 to discharge the accumulated water in the underground structure 100 to the outside. The water stored in the underground structure 100 is taken into the drainage device 1 through the lower opening end portion 11a of the vertical pipe portion 11, and this is stably supplied through the outer opening end portion 10a of the horizontal pipe portion 10. Can be discharged outside the machine. Moreover, it can install only by making it fit in the side wall 100a, and attachment work is easy. And since it has the non-return valve mechanism 2 which closes the lower opening edge part 11a and opens the lower opening edge part 11a when the water level of the stored water in the underground structure 100 rises, for example, soil on the roadbed side Even when the soil has water permeability, it is possible to prevent water outside the machine from flowing into the underground structure 100.

  Further, in the drainage device 1 of the present embodiment, the check valve mechanism 2 includes a valve seat portion 21 in which an inflow hole 21b communicating the external space and the internal space of the vertical pipe portion 11 is formed, and the valve seat portion 21. The guide portion 22 is inserted into the inflow hole 21b of the guide portion 22 so as to be movable up and down, and the valve portion 23 is provided on the end portion of the guide portion 22 on the side protruding into the vertical tube portion 11. The inflow hole 21b is closed by contact with the valve portion 23, and the valve portion 23 is moved upward in conjunction with the guide portion 22, so that the valve portion 23 is separated from the valve seat portion 21 and the inflow hole 21b is opened. Therefore, unlike a conventional drainage device, the burden of maintenance work can be reduced with a simple configuration without using a drive source such as a drainage pump, and the accumulated water in the underground structure 100 can be drained stably. can do.

  In particular, since the valve portion 23 is connected to the guide portion 22 inserted through the inflow hole 21b of the valve seat portion 21 and the valve portion 23 is moved up and down in conjunction with the guide portion 22, the valve seat portion The valve portion 23 can be moved up and down stably while being guided by the guide portion 22 with respect to 21, and the opening and closing of the inflow hole 21 b of the valve seat portion 21 can be ensured.

  Further, in the drainage device 1 of the present embodiment, a part or all of the guide portion 22 is formed from the buoyancy member 25, so that the guide portion 22 can generate a large buoyancy, and the stored water in the underground structure 100 As the water level rises, the valve portion 23 can be reliably moved up to reliably open the inflow hole 21b.

  Further, in the drainage device 1 of the present embodiment, since the water filtering member 12 is disposed at the outer opening end portion 10a of the horizontal tube portion 10, impurities such as dust contained in the stored water in the underground structure 100 are removed. After being filtered by the filter member 12, it can be drained outside the machine to protect the natural environment outside the machine. On the other hand, after the accumulated water contained in the water outside the machine is filtered by the filter member 12, the horizontal tube Since it flows into the part 10, the malfunction of the check valve mechanism 2 due to impurities such as dust contained in the water can be prevented.

  In addition, as a structure of the drainage device 1, it is not limited to the Example mentioned above, A various change is possible unless it deviates from the objective of this invention.

  That is, the drainage device 1 according to the above-described embodiment is installed in a manhole in a group of underground structures for burying various wirings for power and communication in the ground. Although used to prevent the ground surface G from flowing out (overflowing) on the road or sidewalk, the structure of the underground structure 100 in which the drainage device 1 can be installed is not limited to this. For example, it may be a structure installed underground such as open pits, underdrains, underground buried objects (underground burial boxes), etc. You may use in order to prevent generation | occurrence | production of the stored water in the underground structure 100.

  Further, in the drainage device 1 of the above-described embodiment, the configuration in which the horizontal pipe portion 10 and the vertical pipe portion 11 are integrally connected and the horizontal pipe portion 10 and the vertical pipe portion 11 are continuously connected in an internal communication manner has been described. (See FIG. 3), the configuration of the horizontal tube portion 10 and the vertical tube portion 11 is not limited to this. For example, one continuous tubular member in the drainage device 1 is bent or the like, and the horizontal tube portion 10 and The vertical pipe portion 11 may be formed.

DESCRIPTION OF SYMBOLS 1 Drainage device 2 Check valve mechanism 10 Horizontal pipe part 10a Outer opening edge part (opening edge part)
10b Inner opening end portion 11 Vertical tube portion 11a Lower opening end portion (opening end portion)
DESCRIPTION OF SYMBOLS 12 Filtration member 13 Cap member 14 Water stop member 20 Cap member 20a Base part 20b Standing wall part 20c Operation piece part 20d Through-hole 21 Valve seat part 21a Contact surface 21b Inflow hole 22 Guide part 23 Valve part 23a Contact surface 24 Hanging Stop member 25 Buoyant member 100 Underground structure 100a Side wall 100b Pipe through hole 101 Pipe rod 102 Underground burial box

Claims (3)

In the underground structure drainage device that discharges the accumulated water in the underground structure to the outside of the underground structure,
A horizontal pipe portion that is fitted in a through-hole drilled in the side wall of the underground structure, and that is arranged in a lateral direction with an open end facing the outside of the underground structure;
A vertical pipe portion which is continuous in an internal communication with the horizontal pipe portion and is arranged in a vertical direction with an open end portion directed downward of an underground structure;
A check valve mechanism that is provided at the opening end of the vertical pipe portion, closes the opening end, and opens the opening end when the water level of the stored water in the underground structure rises;
A water filtering member disposed at the open end of the horizontal tube portion;
A drainage apparatus for underground structures, comprising: The check valve mechanism is
A valve seat portion in which an inflow hole communicating the external space and the internal space of the vertical pipe portion is formed;
A guide portion inserted through the inflow hole of the valve seat portion so as to be movable up and down;
A valve portion provided at an end portion of the guide portion on the side protruding into the vertical tube portion,
The valve portion comes into contact with the valve seat portion, the inflow hole is closed, and the valve portion moves upward in conjunction with the guide portion, so that the valve portion is separated from the valve seat portion and the inflow The drainage device for an underground structure according to claim 1, wherein the hole is opened.   The drainage device for an underground structure according to claim 2, wherein a part or all of the guide portion is formed of a buoyancy member.

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