JP2656664B2 - Power plant - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a power plant, and more particularly to a power plant having a building that includes equipment that is required to prevent its function from being impaired by flooding.

[Conventional technology]

The power plant is provided with drainage facilities in the building, for example, those disclosed in JP-A-63-284495 or JP-A-59-27292. Discloses a drain funnel installed on each floor of a building 1 as shown in FIG.
The system collects the leaked liquid on each floor by the drain 10 and collects the leaked liquid collected by the drain funnel 10 on each floor by the drain collection pipe 11 mainly to the drain sump pit 12 installed on the lowest floor of the building 1. ing. FIG. 7 shows a method of transferring the leaked liquid from the drain sump pit to another large drain sump pit.
The leaked liquid once stored in the drain sump pit 13 is
The wastewater is transferred to another large-sized drain sump pit 16 by the drainage lines 14 and 15, where a predetermined treatment is performed. The drain funnel 10 and the drain collection pipe 11 shown in FIG. 6 and the drain drain line shown in FIG.
14 and 15 are relatively small in diameter so as to satisfy the specifications corresponding to a small leak in a normal plant, and the drain sump pits 12 and 15 in FIGS. 6 and 7 are used.
13 and 16 themselves are not very large in ordinary plants, and large amounts of leakage occur, for example, due to breakage of cooling seawater piping used for condensing main steam for turbine drive in thermal and nuclear power plants. Since it does not have the ability to follow water, no effect can be expected for a large amount of flooding, and it is impossible to avoid the rise of the water level in the building due to the flooding only by installing this facility.

[Problems to be solved by the invention]

In general, as a drainage facility in a building, as described above, as a countermeasure for leakage of a relatively small amount, a drain funnel (drain tray) is installed on each floor and the generated leakage liquid is collected by the floor gradient to the drain funnel, The leakage liquid collected by the drain funnel on each floor is mainly transferred to the drain sump pit installed on the lowest floor by the drain collection pipe that communicates the drain funnel on each floor, and is collected. The collected leaked water is taken out of the building through predetermined treatment depending on the properties of the leaked liquid. However, the leak sources inside the building are not only those that cause a relatively small amount of leaks, but also, in some cases, buildings that house equipment that has the potential to cause a considerable amount of leaks. The conventional building drainage system has a small drain funnel receiving area and a small drain collection pipe diameter, and it is impossible to efficiently treat a large amount of leaked water in view of the capacity of the drain sump pit. For this reason, in a building where a large amount of leakage has occurred, a large amount of overflow occurs, and the balance between the amount of overflow and the amount of treatment is not maintained, so that liquid that can not be treated in the building will remain until the leakage from equipment stops. Continue to increase. In addition, from the viewpoint of expanding the overflow from the area where the flood has occurred, the level of the leaked water in the area where the flood has occurred rises and leaks through the opening to the adjacent area, so that the range of the overflow increases. In addition, as a method of preventing the expansion of overflow with the conventional building structure in consideration of maintaining the function by preventing flooding of important equipment installed in the building, the area can be considered to be watertight. The rising water pressure on the equipment that composes the boundary, such as the building frame and watertight doors, is becoming stricter, resulting in an increase in the cost and a reduction in the degree of freedom in layout due to the increase in the frame thickness, and further restoration. Drainage as a countermeasure cannot be implemented efficiently, and there is a problem in terms of maintainability.

The present invention is effective not only for small leaks, but also for efficiently draining a large amount of leaked water to the outdoors at an early stage, thereby reducing the extent of leaks in the building and reducing the area in which measures to prevent the leaks are taken. It is an object of the present invention to provide a power generation plant having a drainage facility capable of protecting important facilities housed in a building while reducing specifications for the structure.

[Means for solving the problem]

To achieve the above object, the present invention has the following features: (1) equipment such as a large-sized seawater pump having a large amount of water source, such as a large-diameter seawater pipe, and prevention of impairment of functions due to flooding. In a power plant that includes safety equipment required in the same building, there is a possibility that a large amount of overflow in the building may occur and the building near an area where a large amount of leaked water can be led. An opening is provided at a level lower than the overflow water level of the outdoor wall, and the opening is connected to a ground part or an open sea or a headrace leading to the open sea outside the building,
A means for passively and continuously draining a large amount of the leaked water generated in the building to the outside of the building from the opening of the outside wall surface of the building, wherein: It is an area that can guide leaked water without impairing the function of the equipment.

Things.

In other words, a large amount of leaked water overflows in the area where a large amount of leakage has occurred in the building, and the area is expanded to the adjacent area so that the function is not lost due to flooding of important equipment, and For the purpose of reducing the water pressure resistance condition for the watertightness of the building area in order to prevent it, an opening is provided in the building outdoor wall near the area where a large amount of leakage occurs, and this opening is connected to the outside or the open sea or the open sea Connect to existing headrace of existing plant. As a result, a large amount of leaked water generated in the building will flow toward the opening where the flow resistance is small, and the amount of inflow into the adjacent area can be reduced. Since the water level does not rise significantly higher than the height of the opening for drainage to the outside, the specification of water resistance due to the water level rise is reduced. On the other hand, the drainage facility composed of this opening and a facility connected to the outdoor or the open sea or a headrace leading to the open sea, so as to prevent the intrusion of objects from the outside and fluids and the like in consideration of the outdoor environment at the time of the plant normally. By arranging facilities in consideration of the precipitation level, open sea level, etc., drainage from the building shall have a passive function without a driving mechanism by power, and at the same time a large amount of leakage will occur, The function works, and the water can be continuously drained outdoors.

[Action]

The opening provided on the building exterior wall is installed as close as possible to the area where a large amount of leakage occurs inside the building, and is installed at a level as close as possible to the floor level where a large amount of leaked water stays. It is set so that the amount of leaked water is as small as possible and the level of the overflow is as low as possible. The size of the opening shall be set to a size that can handle the overflow amount generated in the building, and set so that the treatment capacity does not fall below the overflow amount and the amount of stagnation in the building does not increase. . On the other hand, when connecting the opening of the exterior wall of the building to the outside or the existing headrace that leads to the open sea or the open sea, when the opening is installed at the building ground level in relation to the flooding area in the building, the opening will be iron grate etc. Is installed to prevent the entry of objects from the outside. In addition, louvers will be installed to prevent rainwater from flowing into the building. If the level of the opening is underground, connect the outside or the open sea or the headrace with a communication pipe corresponding to the size of the opening considering the amount of overflow in the building, and transfer the leaked water from the building to the outside world. Is provided. Also in this case, an iron grate or the like that does not hinder the outflow of leaked water shall be installed for the purpose of preventing the entry of an object from outdoors to indoors. When the communication pipe is connected outdoors, a roof or the like is provided at the opening of the communication pipe on the ground in order to prevent inflow of rainwater or the like. On the other hand, when connected to the open sea, the maximum level of the communication pipe should be set higher than the highest open sea level, or the opening level of the building, so that seawater does not flow into the building at any time from the open sea. The water level is set higher than the above water level, and it is arranged to prevent seawater from flowing backward. On the other hand, when connecting to the headrace, the highest level of the open sea is also considered, and the level of the communication pipe or the outside wall of the building is set in consideration of the head pressure considering the pressure of the fluid in the headrace. It has the function of preventing seawater from flowing into the room. In addition, a steel grid or the like is installed in a communication pipe connected to the open sea or a headrace channel leading to the open sea or an opening of an outdoor wall of the building, and has a structure for preventing an object from entering the building from the outside. Therefore, as described above, the drainage system consisting of a building outdoor wall opening and a communication pipe having no power drive mechanism constitutes an extremely passive system in which a drainage function works as a large amount of building leakage occurs. And
And it has a continuous drainage function.

〔Example〕

Hereinafter, examples of the present invention will be described. FIGS. 1, 2, 3, 4, and 5 are explanatory diagrams of drainage equipment of different embodiments.

FIG. 1 shows an embodiment in which drainage of overflow from a building is directly performed in the open sea. The outer wall of the building 1 is closest to the area 2 where a large amount of flooding occurs inside the building, and the ocean water level (HHW
L) An opening 4 is provided at a position higher than 3). Then, the leakage water in the area 2 where a large amount of overflow occurs in the building, where the overflow occurs, passes through the communication pipe 5 and the overflow level in the building becomes
From the point of time when the level becomes higher than the lower end level of the building outdoor wall surface opening 4, it is automatically discharged to the open sea by the action of gravity due to the downward slope to the open sea set in the communication pipe 5. Since the building opening level is set higher than the highest open water level of 3, the seawater does not flow into the building from the open sea. Further, the downflow of the communication pipe 5 toward the ocean does not cause rainwater or the like to flow into the building. On the other hand, measures against entry into the building from the outside of the object are achieved by installing a steel grid or the like between the opening 4 and the communication pipe opening 6. FIG. 2 shows a headrace channel that leads leakage water from the building to the existing open sea. This is an example of connecting to the present embodiment. As in the case shown in FIG. 1, an opening 4 is provided on the outer wall surface of the building 1 which is close to the area 2 where the overflow occurs and which is set higher than the highest open sea water level 3. The opening 4 is further connected by a communication pipe 6 to an existing headrace 5 that communicates with the open sea, and by setting the height of the building outdoor wall opening to the height indicated by the formula (1), the opening 4 After preventing backflow of seawater into the building, it is possible to drain the leaked water from the area 2 where a large amount of overflow occurs into the headrace through the communication pipe 6.

H = HHWL + Δh (1) H: Opening lower end level HHWL: Open sea maximum water level Δh: Headwater head pressure Here, an iron grid or the like is provided in the opening 4 or the communication pipe 6 as necessary. The object shall be prevented from easily entering the building from outside.

FIG. 3 shows an embodiment in which the leaked water in the building is discharged to the ground, and an opening 4 for draining the leaked water is installed on the outer wall surface of the building 1,
The leaked water inside the building is drained to the above-ground part by the communication pipe 6. However, since we are basically constructing a passive system,
The water level in the building rises to the level of the ground discharge section 7 of the communication pipe 6. Therefore, as an alternative, a submersible pump 8 may be provided at the bottom of the communication pipe 6 to forcibly drain the water outdoors by power drive. In addition, a roof structure 9 is provided on the communication pipe ground part in order to prevent entry of rainwater or the like. Further, in the opening 4 or the communication pipe 6,
In order to prevent an object from easily entering the building from the outside, an iron grate or the like shall be provided. As a result, a large amount of leaked water generated in the building is discharged to the outside, and the water level in the building is maintained at a level lower than the level of the discharge pipe 7 on the outside of the building. It is possible to reduce the condition of water pressure resistance.

FIG. 4 shows an embodiment in which the overflow in the building is installed at the ground level of the building 1. On the outer wall surface at the ground level near the building 2 near the area 2 where a large amount of overflow occurs, the water level in the building with respect to the overflow amount is shown. The opening 4 having an opening area having a drainage treatment capacity such that the opening does not rise above the installation level of the opening 4 is installed, and an iron grate or the like for preventing an object from easily entering from the outside is installed in the opening, and Louvers will be provided to prevent rainwater from entering the building from outside. As a result, a large amount of overflow generated in the building can be drained to the outside by means of relatively simple equipment through the opening provided in the building wall, and the rise of the water level in the building, which causes the overflow of the building, can be suppressed. In addition, the design water pressure for the building frame, watertight doors, and the like can be reduced, and the cost can be reduced. In FIG. 5, a communication pipe 6 connecting the area 2 of the building where the flooding occurs and the headrace 5 is installed, and the upper end level of the communication pipe is set to H as defined in the above-mentioned equation (1), A large amount of leakage in area 2 where flooding occurs by preventing backwater from flowing into the building inside the building and, if necessary, installing a grate in the communication pipe to prevent objects from entering the building from outside A structure for discharging water into a headrace is provided.

〔The invention's effect〕

According to the present invention, it is possible to provide a method and a structure for efficiently draining a large amount of leaked water, which is generated due to damage to equipment serving as a large amount of water source existing in the building, to the outside, so that overflow of the building is generated. The water level in the building, which causes the area to expand, can be suppressed, and the reduction of the design water pressure for the building frame thickness or the watertight door specification that constitutes the watertight section can be achieved by this suppression, and it is placed in the building. The present invention can provide a power plant capable of effectively protecting important equipment whose function can be lost due to flooding, and has a great industrial effect.

[Brief description of the drawings]

FIGS. 1, 2, 3, 4 and 5 are explanatory diagrams of drainage equipment of different embodiments of the power plant of the present invention, FIGS. 6 and 7, respectively. It is explanatory drawing of the drainage equipment of the conventional power generation plant. 1 ... building, 2 ... area where overflows occur, 3 ... highest water level in the open ocean, 4 ... opening, 5 ... communicating pipe, 6 ... communicating pipe opening, 7 ... communicating pipe ground discharge section, 8 ... ... submersible pump, 9 ...
… Roof structure, 10… Drain funnel, 11… Drain collection pipe, 12… Drain sump pit, 13… Drain sump pit 14,15… Drain line, 16… Large drain sump pit.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-11199 (JP, A) JP-A-59-27292 (JP, A) JP-A-63-284495 (JP, A)

Claims (2)

(57) [Claims] (1) A facility such as a large-sized seawater pump having a large amount of water source such as a large-diameter seawater pipe and a safety-related facility required to prevent a function from being impaired by flooding are included in the same building. In the power plant, a large amount of overflow in the building is likely to occur, and an opening is provided at a level lower than the overflow level of the outdoor wall surface of the building near an area where a large amount of leakage water can be led, The opening is connected to the ground part or the open sea or a headraceway leading to the open sea outside the building, and a large amount of the leaked water generated in the building is passively transferred to the building outside from the opening of the building outdoor wall surface. A power plant having means for continuous drainage. 2. The drainage system according to claim 1, wherein said area is an area capable of guiding leaked water without impairing the function of the facility.