CN112761179B - Automatic flood prevention wall for underground space - Google Patents
Automatic flood prevention wall for underground space Download PDFInfo
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- CN112761179B CN112761179B CN202011358444.4A CN202011358444A CN112761179B CN 112761179 B CN112761179 B CN 112761179B CN 202011358444 A CN202011358444 A CN 202011358444A CN 112761179 B CN112761179 B CN 112761179B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/10—Dams; Dykes; Sluice ways or other structures for dykes, dams, or the like
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Abstract
The invention discloses an automatic flood prevention wall for an underground space, which comprises flood prevention baffles, wherein the flood prevention baffles are arranged on a main body structure, a water storage tank is arranged below the main body structure, and a water storage tank drainage controller is arranged at the bottom of the water storage tank. When the water depth in front of the speed bump does not exceed the top of the speed bump, the water discharge controller of the water storage tank is in an open state, accumulated water generated by daily urban watering maintenance and the like enters the water tank and can be immediately discharged, the flood prevention wall is effectively prevented from being opened by mistake, meanwhile, manual opening of emergency situations is supported, and the reliability is high; the invention combines the action characteristics of gravity and water buoyancy and the principle of a floating ball device, the whole device does not need electricity, saves energy and has high safety; the flood prevention baffle is positioned at the top of the deceleration strip, so that when a vehicle passes through, the pressure on the flood prevention baffle is reduced due to a certain centrifugal effect, and the service life is long; the power source is gravity, and the power source does not relate to electric power, hydraulic pressure and the like, and has simple structure and low manufacturing cost.
Description
Technical Field
The invention belongs to the field of underground space management equipment, and particularly relates to an automatic flood prevention wall for an underground space.
Background
In recent years, extreme rainstorm weather is frequent due to global warming, urbanization speed is increased, ground hardening rate is continuously increased, infiltration capacity is reduced, and urban waterlogging disasters are particularly prominent. Urban waterlogging disasters and hazards are numerous, including the influence on traffic safety, urban sanitation, economy and the like; the economic influence is the most direct, namely 5-7.7.2020, Guangzhou city is attacked by heavy rain, 35 underground spaces are flooded by water with different degrees, the number of flooded vehicles reaches 1409, and the gross loss reaches about 4 billion yuan. Underground spaces are often subject to flooding due to their low topography; in the traditional flood prevention mode, flood prevention sand bags are mostly adopted to artificially build flood prevention walls or install flood prevention baffles, and after an inland inundation disaster occurs, the artificial site temporary building or installation is needed, so that time and labor are wasted, the waterproof performance is poor, and the flood prevention effect is unsatisfactory; therefore, it is necessary to design a full-automatic underground space flood control wall.
Disclosure of Invention
The invention aims to provide an automatic flood prevention wall for an underground space, which is automatically started after waterlogging occurs, solves the problem that the flood prevention wall is mistakenly opened when a road is cleaned and sprinkled, and has the characteristics of no need of electricity, high safety, simple structural principle and low manufacturing cost.
The technical scheme is that the automatic flood prevention wall for the underground space comprises flood prevention baffles, wherein the flood prevention baffles are arranged on a main body structure, a water storage tank is arranged below the main body structure, and a water discharge controller of the water storage tank is arranged at the bottom of the water storage tank.
The baffle is connected with the deceleration strip through a hinge; the water inlet of a water guide device is connected below the water inlet, the water outlet of the water guide device is connected with a water stop plate through a hinge, and when the flood prevention baffle plate is opened, the water stop plate is driven by the rotating connecting rod b to close the water outlet of the water guide device. The water stop plate is connected with the water storage tank below the deceleration strip through a rotating connecting rod b; the water storage tank is supported and installed below the deceleration strip by a slide rail, and the front side of the water storage tank is connected with the flood prevention baffle plate through a rotating connecting rod a.
The bottom of the water storage tank is provided with a water outlet which is connected with a water discharge controller of the water storage tank through a rubber hose;
the water discharge controller of the water storage tank comprises a box body, and a row of water inlet holes are formed in the top of the box body.
The flood prevention baffle is rectangular, the width matched with the rotating connecting rod needs to be reserved at the connecting position of the hinge and the top of the deceleration strip, and groove-shaped waterproof rubber is attached to each of the two sides of the flood prevention baffle.
The two sides of the deceleration strip are respectively provided with a fixing plate, the fixing plates are provided with inclined brake bars, the front surfaces of the brake bars are pasted with water stop rubber strips a, and the water stop rubber strips are embedded with water stop rubber on the flood prevention baffle to stop water when the flood prevention baffle turns over.
The specific shape of storage water tank is a horizontal right angle triangular prism, and its face that the area is the biggest contacts with the slide rail, and the water storage top is the opening.
The slide rail is installed at the bottom of the water storage tank and supports the water storage tank, the water storage tank can freely slide on the slide rail, and the sum of the included angle between the slide rail and the horizontal plane and the included angle between the inclined plane and the vertical plane of the water storage tank is 90 degrees.
The top of the box body extends out of the ground surface, the top of the box body is flush with the top of the deceleration strip after installation, the bottom of the box body is flush with the bottom of the support steel frame, and the lower edge of the water inlet hole is flush with the ground surface; the water outlet of the water storage tank is connected with a floating ball valve b through a rubber hose, the water outlet of the box body is connected with a floating ball valve a for controlling water in the box body to be discharged, the height of the floating ball valve b connected with the water storage tank is not higher than the lowest water level height of the water storage tank, and when the floating ball valve a for controlling the water in the box body to be discharged is opened, the lowest point of a floating ball is flush with the lower edge of the water inlet hole.
The invention has the beneficial effects that:
according to the automatic flood control wall for the underground space, when flood occurs and the water level in front of the deceleration strip exceeds the top of the deceleration strip, water flows enter the water storage tank below the deceleration strip along the water guide device through the water inlet hole in front of the deceleration strip, the water in the water storage tank is accumulated to a certain degree and moves downwards under the action of gravity, the flood control wall is pulled to be turned up through the rotating connecting rod, and the water flows are effectively prevented from entering the underground space to cause economic loss; according to the automatic flood prevention wall for the underground space, disclosed by the invention, when the water depth in front of the deceleration strip does not exceed the top of the deceleration strip, the water discharge controller of the water storage tank is in an open state, accumulated water generated by daily urban watering maintenance and the like enters the water tank and is immediately discharged, the condition that the flood prevention wall is opened by mistake is effectively prevented, meanwhile, manual opening of emergency situations is supported, and the reliability is high; according to the automatic flood prevention wall for the underground space, the characteristics of gravity and water buoyancy are combined with the principle of the floating ball device, the whole device does not need electricity, energy is saved, and the safety is high; according to the automatic flood prevention wall for the underground space, the flood prevention baffle is positioned at the top of the deceleration strip, when a vehicle passes through the wall, the pressure on the flood prevention baffle is reduced due to a certain centrifugal effect, and the service life is long; the underground space automatic flood prevention wall has the advantages that the power source is gravity, electric power, hydraulic pressure and the like are not involved, the structure is simple, and the manufacturing cost is low.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an automatic flood control wall for underground space of the invention;
FIG. 2 is a schematic structural view of a water guide device of an automatic flood control wall for underground space of the invention;
FIG. 3 is a schematic structural view of a flood control baffle of the automatic flood control wall for the underground space;
FIG. 4 is a schematic view of a connection structure of flood control baffles of the automatic flood control wall for underground space of the invention;
FIG. 5 is a schematic structural diagram of a main body of the automatic flood control wall for underground space of the invention;
FIG. 6 is a schematic structural diagram of a main body of the automatic flood control wall for underground space of the invention;
FIG. 7 is a schematic diagram of a water storage tank structure of an automatic flood prevention wall for an underground space according to the invention;
FIG. 8 is a schematic structural view of a water storage tank drainage controller of an automatic flood prevention wall for an underground space according to the present invention;
FIG. 9 is a schematic structural view of a water guide device of an automatic flood control wall for an underground space according to the present invention;
fig. 10 is a schematic view of a small sample of an automatic flood control wall for an underground space according to the present invention.
In the figure, 1, a flood prevention baffle, 1-1, flood prevention baffle water stop rubber a, 1-2, a hinge a, 1-3, a flood prevention baffle rotating connecting rod connecting end, 1-4, flood prevention baffle water stop rubber b, 2, a main body structure, 2-1, a brake strip, 2-2, a speed reducing belt water stop rubber a, 2-3, a fixing plate, 2-4, a water inlet, 2-5, a support frame, 2-6, a slide rail, 2-7, speed reducing belt water stop rubber b, 2-8, a speed reducing belt, 3, a water storage tank, 3-1, a rotating connecting rod connecting end a, 3-2, a rotating connecting rod connecting end b, 3-3, a water storage tank water discharge controller, 4-1, an L-shaped box body, 4-2, a water inlet hole, 4-3, a floating ball valve a, 4-4 of a floating ball valve b, 5 of a water guide device, 5-1 of a water guide device hinge, 5-2 of a water guide device outlet water stop plate, 5-3 of a water guide device rotating connecting rod connecting end, 6 of a rotating connecting rod a, 7 of a water guide hose and 8 of a rotating connecting rod b.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
The invention discloses an automatic flood prevention wall for an underground space, which is structurally shown in a figure 1 and comprises flood prevention baffles 1, wherein water stop rubbers 1-1 are respectively arranged on two sides of each flood prevention baffle, and the flood prevention baffles 1 are connected with deceleration strips 2 through hinges a 1-2; two sides of the speed reducing belt 2 are respectively provided with a fixing plate 2-3, an inclined brake bar 2-1 is arranged on the fixing plate 2-3, a speed reducing belt water stop rubber a 2-2 is arranged on the brake bar, a row of water inlets 2-4 are formed in the top of the water facing side of the speed reducing belt, a support frame 2-5 is located at the bottom of the speed reducing belt 2, and a slide rail 2-6 is fixed on the support frame 2-5; the flood prevention baffle 1 and the water storage tank 3 are respectively connected with a corresponding flood prevention baffle rotating connecting rod connecting end 1-3 and a corresponding water storage tank rotating connecting rod connecting end a 3-1 through a rotating connecting rod a 6, a water outlet 3-3 is arranged at the bottom of the water storage tank 3, and the water outlet 3-3 is connected with a floating ball valve b of a water storage tank water discharge controller 4 through a rubber hose 7; the water discharge controller 4 of the water storage tank consists of an L-shaped box body with an opening at the top, a floating ball valve a 4-3 and a floating ball valve b 4-4, and a water inlet hole 4-2 is arranged on the L-shaped box body 4-1; the water guide device 5 is welded right below a water inlet 2-4 of the deceleration strip, a water stop plate 5-2 of the water guide device is connected to the water outlet through a water guide device hinge 5-1, a connecting end 5-3 of a rotating connecting rod is arranged on the front side of the middle of the water stop plate, and the connecting end 5-3 of the rotating connecting rod is connected with a connecting end b 3-2 of a rotating connecting rod of the water storage tank through a rotating connecting rod b 8, as shown in figure 2.
As shown in fig. 3 to 4, the width of the flood prevention baffle 1 should be slightly smaller than the width of the deceleration strip 2, and the length of the gate bar 2-1 should be not smaller than the height of the flood prevention baffle 1.
Wherein, the included angle between the slide rail 2-6 and the horizontal plane is equal to the included angle between the bottom surface of the water storage tank and the horizontal plane.
The water inlet of the water storage tank drainage controller 4 is flush with the lower edge of a deceleration strip slope, the upper edge of the L-shaped box body 4-1 is not lower than the upper edge of the deceleration strip, the floating ball valve a 4-3 controls water in the box body L to be drained, when the floating ball valve a 4-3 is opened, a floating ball of the floating ball valve is flush with the lower edge of the water inlet, the opening size of the L-shaped box body is enough to accommodate the floating ball, the floating ball valve b 4-4 controls water in the water storage tank to enter the L-shaped box body 4-1, and when the floating ball valve b 4-4 is opened, the floating ball of the floating ball valve cannot contact with the L-shaped box body.
When the flood prevention baffle is closed, the rotating connecting rod a 6 and the rotating connecting rod b 8 respectively connect the flood prevention baffle 1 with the water storage tank 3 and connect the water stop plate 5-2 of the water guide device with the water storage tank 3, when the water amount of the water storage tank is accumulated to a certain degree, the water storage tank slides downwards along the slide rail, the rotating connecting rod a 6 drives the flood prevention baffle to be opened, the brake bars on the flood prevention baffle fixing plate are tightly embedded together, at the moment, the rotating connecting rod b 8 drives the rotating connecting rod water guide device water stop plate 5-2 to be closed, and the water guide device does not convey water to the water storage tank.
The main components of the automatic flood control wall for the underground space have the following functions:
flood prevention baffle 1: the main water retaining function of the bearing arm is realized after the bearing arm is turned up;
flood prevention baffle water stop rubber a 1-1: water is embedded with the water-stopping rubber a 2-2;
hinge a 1-2: the flood prevention baffle plates are connected with the deceleration strip, so that the flood prevention baffle plates can rotate around the joint page and turn up when the water storage tank slides;
1-4 of flood control baffle water stop rubber b: after the flood prevention baffle is turned up, water stop rubber b 1-4 of the flood prevention baffle and water stop rubber b 2-7 of the deceleration strip are embedded for water stop;
as shown in the figures 5-6 of the drawings,
2-1 of brake bars: the flood prevention baffle is fixed to block water when the flood prevention baffle is opened;
fixing plates 2-3: fixing a deceleration strip 2-8 and installing a brake strip 2-1 on the deceleration strip;
2-4 of water inlet: when the water depth in front of the speed bump exceeds the top of the speed bump, water flow enters the water guide device 5 along the water inlet;
2-5 of a support frame: the support frame 2-5 is arranged underground during actual installation and mainly supports the speed bump 2-8 and the installation slide rail 2-6;
slide rail 2-6: supporting the water storage tank 3 and enabling the water storage tank 3 to slide along the slide rails 2-6;
as shown in fig. 7, the water storage tank 3: storing accumulated rainwater, and when the rainwater is accumulated to a certain amount, sliding downwards along the slide rail under the action of gravity to drive the flood prevention baffle 1 to be opened;
A water outlet 3-3: when the water depth in front of the deceleration strip 2-8 is lower than the top of the deceleration strip, the water in the water storage tank 3 is controlled by the water storage tank drainage controller 4 to be drained from the drainage port 3-3;
as shown in fig. 8, the storage tank drain controller 4: when the water depth before the speed reducing belts 2-8 is lower than the tops of the speed reducing belts 2-8, the water storage tank water discharge controller 4 controls the water storage tank 3 to discharge water, and when the water depth before the speed reducing belts 2-8 is higher than the tops of the speed reducing belts 2-8, the water storage tank water discharge controller 4 controls the water discharge port of the water storage tank 3 to be closed;
a box body 4-1: when the water storage tank 3 drains, water is firstly drained into the box body 4-1 and then drained through the floating ball valve a 4-3, and meanwhile, the floating ball valves a and b are controlled to be opened and closed by water level change in the box body;
water inlet 4-2: when water begins to accumulate on the ground, water flow enters the box body along the water inlet 4-2, and when the water depth in front of the speed-reducing belt begins to be lower than that of the speed-reducing belt, water in the box body, which is higher than the water inlet, is gradually discharged into the ground through the water inlet;
float valve a 4-3: controlling the water in the box body 4-1 to be discharged;
float valve b 4-4: controlling water in the water storage tank to enter the box body 4-1;
as shown in fig. 9, the water guide device 5: guiding water flow entering along the water inlets 2-4 into the water storage tank 3, and closing the water outlet of the water guide device 5 after the flood prevention baffle is opened, so that water does not enter the water storage tank 3;
Water guide device hinge 5-1: connecting the water stop plate 5-2 to a water outlet of the water guide device;
5-2 of water stop plate: controlling the opening and closing of a water outlet of the water guide device 5;
rotating link a 6: connecting the flood prevention baffle 1 with the water storage tank 3;
a rubber hose 7: discharging water in the water storage tank 3 into a water discharge controller of the water storage tank;
rotating link b 8: a water stop plate 5-2 connected with the water guide device 5 and the water storage tank 3;
connecting ends of the rotating connecting rods are 1-3, 3-1, 3-2 and 5-3: is connected with a rotating connecting rod.
The underground space automatic flood prevention wall has the following specific working process:
the automatic flood prevention wall for the underground space is used as a deceleration strip for the entrance and exit of the space when no urban flood occurs at ordinary times; when flooding occurs and water is accumulated on the ground, water enters the box body 4-1 along the water inlet hole 4-2 of the water storage tank drainage controller 4, the box body 4-1 is filled with water quickly and rises along with the rise of the ground surface water level, the water level of the box body 4-1 and the ground surface water level rise synchronously, when the ground surface water level is higher than the top of the deceleration strip 2-8, the floating ball valves a and b are all closed, and the water storage tank drainage controller 4 controls the water storage tank 3 not to drain water outwards; at the moment, water flow enters the water storage tank 3 through the water guide device along the water inlet 2-4 of the deceleration strip, the water amount in the water storage tank 3 is gradually accumulated, when the water amount in the water storage tank 3 is accumulated to a certain amount, the water storage tank 3 slides downwards along the slide rail 2-6 under the action of gravity, the flood prevention baffle is pulled to turn over through the rotating connecting rod a 6, and meanwhile the connecting rod b 8 is rotated to drive the water stop plate 5-2 of the water guide device to close the water outlet of the water guide device 5; after the flood prevention baffle 1 is opened, the flood prevention baffle water stop rubber a 1-1 and the speed bump water stop rubber a 2-2 are tightly embedded with water, and the flood prevention baffle water stop rubber b 1-2 and the speed bump water stop rubber b 2-7 are tightly embedded with water; when flood is finished, a floating ball valve a 4-3 of a water storage tank drainage controller 4 is firstly opened, water in a box body 4-1 starts to be drained, when the water level in the box body 4-1 is lower than the position of a floating ball valve b 4-4, the floating ball valve b 4-4 is gradually opened, water in the water storage tank 3 starts to be drained into the box body 4-1 and then is drained through the floating ball valve a 4-3, when the water in the water storage tank 3 is drained completely, a flood prevention baffle 1 is automatically closed under the action of gravity, the water storage tank 3 slides upwards under the pulling of a rotating connecting rod a 6 to return to the initial position, and a water guide device water stop plate is opened under the pushing of a rotating connecting rod b 8; at this moment, water in the water storage tank 3 can be discharged at any time, water flows such as road maintenance watering and the like are effectively prevented from entering the water storage tank 3 to be accumulated for a long time, and the flood prevention baffle is prevented from being opened by mistake, and the specific implementation structure is shown in fig. 10.
Claims (8)
1. An automatic flood prevention wall for an underground space is characterized by comprising flood prevention baffles (1), wherein the flood prevention baffles (1) are arranged on a main body structure (2), a water storage tank (3) is arranged below the main body structure (2), and a water storage tank drainage controller (4) is arranged at the bottom of the water storage tank (3);
the flood prevention baffle (1) is connected with the deceleration strip (2-8) through a hinge (1-2); a row of water inlets (2-4) are formed in the upstream surface of the top of the deceleration strip (2-8), a water inlet of a water guide device (5) is connected below the water inlets (2-4), a water outlet of the water guide device (5) is connected with an outlet water stop plate (5-2) of the water guide device through a hinge (5-1) of the water guide device, and when the flood prevention baffle plate (1) is opened, the outlet water stop plate (5-2) of the water guide device is driven by a rotating connecting rod b (8) to close the water outlet of the water guide device (5); the water stop plate (5-2) at the outlet of the water guide device is connected with the water storage tank (3) below the deceleration strip (2-8) through a rotating connecting rod b (8); the water storage tank (3) is supported by slide rails (2-6) and is installed below the deceleration strips (2-8), the slide rails (2-6) are fixed on support frames (2-5), and the front side of the water storage tank (3) is connected with the flood prevention baffle (1) through a rotating connecting rod a (6).
2. The automatic flood prevention wall for the underground space according to claim 1, wherein a water storage tank water outlet (3-3) is formed in the bottom of the water storage tank (3), and the water storage tank water outlet (3-3) is connected with a water storage tank water outlet controller (4) through a rubber hose (7);
3. The automatic flood control wall for underground spaces according to claim 2, wherein the water discharge controller (4) of the water storage tank comprises an L-shaped box body (4-1), and a row of water inlet holes (4-2) are formed in the top of the L-shaped box body (4-1).
4. The automatic flood control wall for the underground space according to claim 1, wherein the flood control baffle (1) is rectangular, the width matched with the rotating connecting rod b (8) needs to be reserved at the connecting position of the hinge (1-2) and the top of the speed reducing belt (2-8), and flood control baffle water stop rubbers a (1-1) are respectively stuck to two sides of the flood control baffle (1).
5. The automatic flood prevention wall for the underground space according to claim 1, wherein two fixing plates (2-3) are arranged on two sides of each deceleration strip (2-8), inclined brake bars (2-1) are mounted on the fixing plates (2-3), deceleration strip water stop rubber a (2-2) is pasted on the front faces of the brake bars (2-1), and when the flood prevention baffle (1) is turned up, the deceleration strip water stop rubber a (2-2) is embedded with the flood prevention baffle water stop rubber a (1-1) on the flood prevention baffle to stop water.
6. The automatic flood prevention wall for the underground space according to claim 1, wherein the specific shape of the water storage tank (3) is a transverse right-angled triangular prism, the surface with the largest area is in contact with the slide rail, and the top of the water storage tank (3) is provided with an opening.
7. The automatic flood prevention wall for the underground space according to claim 1, wherein the slide rails (2-6) are mounted at the bottom of the water storage tank (3) to support the water storage tank (3), the water storage tank (3) can freely slide on the slide rails (2-6), and the sum of the included angle between the slide rails (2-6) and the horizontal plane and the included angle between the inclined plane and the vertical plane of the water storage tank (3) is 90 degrees.
8. The automatic flood prevention wall for the underground space according to claim 3, wherein the top of the L-shaped box body (4-1) extends out of the ground surface, the top of the L-shaped box body (4-1) is flush with the top of the speed bump (2-8) after installation, the bottom of the L-shaped box body is flush with the bottom of the support frame (2-5), and the lower edge of the water inlet hole (4-2) is flush with the ground surface; the water outlet (3-3) of the water storage tank is connected with a floating ball valve b (4-4) through a rubber hose (7), the water outlet of the L-shaped tank body (4-1) is connected with a floating ball valve a (4-3) for controlling water in the tank body to be discharged, the height of the floating ball valve b (4-4) connected with the water storage tank (3) is not higher than the height of the lowest water level of the water storage tank (3), and when the floating ball valve a (4-3) for controlling water discharge of the tank body is opened, the lowest point of a floating ball is flush with the lower edge of the water inlet (4-2).
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| CN202011358444.4A CN112761179B (en) | 2020-11-27 | 2020-11-27 | Automatic flood prevention wall for underground space |
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| CN114148449B (en) * | 2021-11-02 | 2023-03-28 | 中船澄西船舶修造有限公司 | Universal pressure gauge protection box for ships |
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| CN203890968U (en) * | 2014-04-30 | 2014-10-22 | 上海华滋奔腾防汛设备制造有限公司 | Flipping type slide rail flood protection gate |
| CN104195981A (en) * | 2014-09-19 | 2014-12-10 | 四川省德名斯科技有限公司 | Flood prevention equipment for entrance of basement |
| CN104452682A (en) * | 2014-12-13 | 2015-03-25 | 天津大学前沿技术研究院有限公司 | Automatic control type steel faceplate dam |
| CN108547368A (en) * | 2018-05-21 | 2018-09-18 | 浙江水利水电学院 | Urban underground space entrance has the rain perforaled strainer of blocking excess water function |
| CN209178920U (en) * | 2018-09-19 | 2019-07-30 | 宁波大学 | It is a kind of to block water system for underground flood fighting |
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| CN112761179A (en) | 2021-05-07 |
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