JPH032433A - Concrete culvert for outflow or inflow of cooling water of condenser - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a concrete culvert that is installed in a turbine building foundation mat and allows condenser cooling water to flow into and out of the condenser in a countercurrent flow.

[Conventional technology] Conventionally, the conduit system for cooling water flowing through the condenser of a nuclear power plant has been developed through "planning, engineering,"
"Construction of Electric Power Generation Facilitation", pages 529 to 5.
Pages 30 and 690 to 692 (PLANNIN
G. ENGINEERING.

AND C0N5TRUCTION OF ELECT
RICPOυERGHNERATION FACILI
TIES, PP 529-530.

As discussed in PP690-692), in order to take in and drain water into the condenser 11 in a counter-current manner using steel intake pipes 1 and drain pipes 2 buried underground as shown in Fig. 6. , the portions 3 and 4 of the intake and drainage pipes 1 and 2 below the condenser are crossed in two stages above and below between the building foundation mats at the bottom of the condenser 11 as shown in Fig. 7, and the riser pipes to the condenser 11 are connected. 6.7 and down pipes 8 and 9 are connected to these, and a part of the cooling water coming from the water intake pipe 1 is connected to the rise pipe 6.7 as shown by the solid arrow. Condenser 11. Through the downpipe 8 and the pipe section 4, and partly as shown by the dashed arrow, the pipe section 3, the riser pipe 7.
The water flows out through the condenser 11 and the down pipe 9 to the water discharge pipe 2.

[Problems to be Solved by the Invention] When installing steel piping that is installed in two stages, upper and lower, across the foundation mat under the condenser, as described above, it is necessary to It is necessary to excavate for the space where the pipes will be buried, and the amount of ground excavation required for laying the pipes is enormous, and the long civil engineering process of excavation and backfilling hinders the shortening of the building construction process. was. Furthermore, the excavated ground was uneven, making it difficult to construct pipes, and the unevenness of the bottom of the turbine building mat had a negative impact on the earthquake resistance of the building as a whole.

The present invention provides a concrete culvert divided into two stages, upper and lower, in the mat at the bottom of the condenser, and allows the cooling water to flow in and out of the condenser through the culvert. The purpose of this project is to reduce the amount of ground excavation needed to install cooling water inflow and outflow piping, shorten the civil engineering work, and also accelerate the start of turbine building construction by proceeding with mat construction and culvert construction in parallel. do.

Furthermore, it is an object of the present invention to improve the earthquake resistance of the entire building by making the bottom of the turbine building foundation mat flat, and to improve workability due to the flat ground.

[Means for Solving the Problems] The concrete culvert for condenser cooling water inflow and outflow of the present invention, which is achieved in order to achieve the above object, has the structural features described in each claim. .

[Function] Cooling water flows into the inlet of the concrete culvert of the present invention from the intake channel, and the − part is the inlet →
The path is one rising part → condenser → one falling part → one of the upper and lower spaces → the outlet part, and the other part is the inlet part → another one of the upper and lower spaces → the other Rising part → condenser →
The water eventually flows as a counter current along the route from the other falling part to the outlet part, and then flows out from the outlet part of the culvert to the drainage channel.

[Embodiment] Fig. 1(a) is an elevational cross-sectional view showing the equipment configuration for flowing cooling water into and out of a condenser using a culvert according to an embodiment of the present invention, and Fig. 1(b) is It is a top view of the cooling waterway. The condenser 11 is installed on a foundation mat 25 of a turbine building 24, and within the foundation mat 25 are a concrete culvert C, an intake channel 26, and a discharge channel 27 based on the present invention.
is formed, and the culvert C has a rising part 16.17
, are connected to the condenser 11 by falling portions 18,19. The intake channel section 28 and the discharge channel section 29 outside the turbine building 24 are connected to a water intake pipe and a water discharge pipe (not shown) made of steel pipes. The lower surface of the foundation mat 25 of the turbine building, including the intake channel 26, drainage channel 27, and culvert C, is flat with no uneven parts.

The culvert C has an inlet portion 30 that communicates with the water intake 126.
and an outlet section 31 communicating with the drainage channel 27, the structure of which will be described in detail later. A portion of the cooling water that has flowed into the intake passage 26 flows into the culvert inlet 30. The flow flows in the order of the rising part 16, the condenser 11, the falling part 18, and the culvert outlet part 31, and the other part flows through the culvert inlet part 30, the rising part 17. Condenser 1.1. The water flows through the falling portion 19 and the culvert outlet portion 31 in this order, and then flows out through the drainage channel 27.

The above-mentioned concrete culvert C is box-shaped as shown in the perspective view in Fig. 2, and has an inlet part 30 and an outlet part 31 on one end surface, and has diagonal positions on the earth wall. The rising parts 16.17 and the falling parts 18.19 are connected diagonally to each other. This culvert C is actually formed integrally with the foundation mat 25 as a reinforced concrete structure.

FIG. 3 is a perspective view in which the top wall and one side wall of the culvert C are virtually separated to clearly illustrate the structure of the culvert C. The interior of the culvert is divided into an upper space 36 and an upper space 37 by a horizontal partition wall 32. The inlet portion 30 is communicated with an upper space 36 by a vertical partition wall 33, and the outlet portion 31 is communicated with an upper space 37 by a vertical partition wall 34. A space 38 defined by the vertical partition wall 35 communicates with the upper space 37, and an adjacent space 39 forms a part of the upper space 36. The rising part 16.17 and the falling part 18.19 lead to the inlet part 30, the space 38, the space 39 and the outlet part 31, respectively. Because of this structure, some of the cooling water that enters from the inlet section 30 flows into the rising section 16, the condenser 11. Falling portion 18. It flows out from the outlet part 31 through the space 38 and the upper space 37, and the other part flows out from the upper space 36, the upper space 37, and so on. rising part 17,
Condenser 11. It flows out from the outlet portion 31 via the falling portion 19 .

FIG. 4 shows the structure of another embodiment of the concrete culvert C, and similarly to FIG. 3, the top wall and one side wall are shown virtually separated. However, in this figure, since those virtually separated earth walls and side walls are the same as in FIG. 3, their illustration is omitted. In this embodiment, the partition wall 32. which is inclined with respect to the horizontal plane. and entrance part 3
A vertical partition wall 34 is provided that extends obliquely toward one corner from the partition wall between the partition wall 0 and the exit portion 31, and these partition walls 32
and 34 each end at their intersection.

A space 36 above the partition wall 32 communicates with the inlet section 30, and a space 37 below the partition wall 32 communicates with the outlet section 31.

A space 38 defined by the vertical partition wall 35 communicates with the upper space 37, and an adjacent space 39 forms a part of the upper space 36. Rising part 16.17. The falling portions 18 and 19 are connected to the inlet portions 30 and 30, respectively. It communicates with the space 38, the space 39, and the exit section 31. In this embodiment as well, the same cooling water flow path as in the embodiment shown in FIG. 3 can be obtained. This embodiment does not have the right-angled partition walls 33 and 34 near the entrance and exit of the culvert as in the embodiment shown in FIG. 3, so that the resistance to inflow and outflow of cooling water can be reduced.

Next, the construction procedure for constructing the above-mentioned concrete culvert will be explained with reference to Fig. 1.

In order to install the turbine building 24, the ground is excavated to the level of the lower end of the mat 25. Next, reinforcing work for mat 25 and reinforcing work for culvert C and mantissa waterways 26 and 27 is performed. After the reinforcing work is completed, concrete will be poured to form the mat section, culvert section, and mantissa channel into one piece. After that, building construction is started, the condenser 11 is brought in, and the culvert C and the condenser 11 are connected through the riser pipe 16.17 and the fall pipe 18.19.

[Effects of the invention] By providing the culvert of the present invention under the condenser,
Cooling water can flow in and out of the condenser in a countercurrent flow, and the thickness of the foundation mat of the turbine building can be made uniform. Compared to conventional technology, the required amount of ground excavation is reduced. Civil engineering work is shortened, and since mat work and culvert work can be carried out in parallel, mat work can be completed earlier, turbine building work can be started earlier, and construction work can be shortened. Furthermore, by using concrete with low thermal conductivity, the intake channel and discharge channel can be integrated and the installation area can be reduced. Furthermore, by making the bottom surface of the mat flat, the earthquake resistance of the entire building will be improved and construction workability will be improved.

[Brief explanation of drawings]

FIG. 1(a) is an elevational cross-sectional view showing a facility for flowing cooling water to a condenser using a concrete culver bottom according to an embodiment of the present invention, and FIG. 1(b5 is a plan view of the cooling water passage) , second
The figure is a perspective view of the concrete culvert of the present invention.
The figures are a perspective view showing the structure of the culvert shown in Fig. 2 after being virtually exploded; Fig. 4 is a perspective view showing the structure of the culvert shown in Fig. Figure 5 is a location diagram showing the conventional condenser cooling water inflow and outflow equipment;
FIG. 6 is a plan view of the arrangement of the cooling water piping of the anti-current type in FIG. 5. 1... Water intake pipe 2... Drain pipe 6.7...
・Rising part 8, 9... Falling part 11... Condenser 16.17... Rising part 18.19...
- Falling part 24... Turbine building 25... Mat 26... Intake channel 27... Drainage channel
30...Culvert population 31...Culvert exit 32.33, 34, 35...Division wall 36.37, 38.39...Space C...Culvert diagram diagram diagram diagram diagram

Claims (1)

[Claims] 1. A box-shaped concrete culvert that is installed at the bottom of the condenser and allows cooling water to flow in and out of the condenser, and has a cooling water inlet and a cooling water inlet on the front side. It has an outlet part, and has a pair of rising parts diagonally positioned on the upper surface side for allowing cooling water to flow out to the condenser, and a pair of rising parts for allowing cooling water to flow in from the condenser. The descending portions are provided in a diagonal relationship with each other, and inside, a space where the inlet portion and the pair of rising portions communicate with each other, and a space where the outlet portion and the falling portions communicate with each other are separated vertically by partition walls. A concrete culvert for condenser cooling water inflow and outflow characterized by being formed in a relationship. 2. The concrete culvert for condenser cooling water inflow and outflow according to claim 1, wherein the partition wall is horizontal. 3. The concrete culvert for inflow and outflow of condenser cooling water according to claim 1, wherein the partition wall is slanted toward the back from the inlet. 4. According to claim 1, 2 or 3, the concrete intake channel and drainage channel are integrally formed in the foundation mat so that the lower surface thereof is flat, and the concrete intake channel and drainage channel are respectively connected to the inlet section and the outlet section. Concrete culvert for condenser cooling water inflow and outflow.