JPH0637788B2 - Concrete culvert for condenser cooling water inflow and outflow - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a concrete culvert which is installed on a turbine building foundation mat and which causes condenser cooling water to flow in and out of a condenser by making an alternating current.

[Prior Art] Conventionally, regarding a water channel system for cooling water flowing through a condenser of a nuclear power plant, “Planning, Engineering, and Construction of Electric Power Generation Facilities”, pages 529 to 530 and 690. To page 692 (PLANNING, EN
GINEERING, AND CONSTRUCTION OF ELECTRIC POWER GENE
RATION FACILITIES, PP529-530, PP690-69
As discussed in 2), using the steel intake pipe 1 and drain pipe 2 buried in the ground as shown in FIG. Drain pipe 1,2
As shown in FIG. 7, the lower parts 3 and 4 of the condenser are crossed in two steps vertically below the building foundation mat M under the condenser 11, and the rising pipes 6 and 7 and the falling pipe to the condenser 11 are crossed. The cooling water coming from the intake pipe 1 has a part of the rising pipe 6 and the condenser 1 as shown by solid arrows.
1, through the falling pipe 8 and the pipe portion 4, and partly through the pipe portion 3, the rising pipe 7, the condenser 11 and the falling pipe 9 as shown by the dashed arrow, to flow out to the discharge pipe 2. It is like this.

[Problems to be Solved by the Invention] As described above, when laying steel pipes that are installed in the foundation mat section under the condenser so as to be crossed vertically in two steps, the ground at the location is made of steel. It is necessary to excavate only the space where the pipe is buried, and the amount of ground excavation for laying the pipe is enormous, and the extension of the civil engineering process for excavation and backfill hinders the shortening of the building construction process. Was. Furthermore, because the excavated ground is uneven, the workability of pipe laying work is poor, and the unevenness under the turbine building mat also adversely affects the earthquake resistance of the entire building.

The present invention provides a concrete culvert that is divided into two upper and lower stages in the lower mat of the condenser, and flows the cooling water against the alternating current into and out of the condenser through the culvert, so The purpose is to reduce the amount of ground excavation for installing cooling water inflow and outflow pipes, shorten civil engineering work, and further accelerate the start of turbine building work by advancing mat work and culvert work in parallel. To do.

A further object of the present invention is to improve the seismic resistance of the entire building by making the bottom of the turbine building foundation mat flat, and to improve the workability of the flat ground.

[Means for Solving the Problems] The concrete culvert for condensing and discharging the condenser cooling water according to the present invention, which is made to achieve the above object, has the structural characteristics described in each of the claims. .

[Operation] Cooling water flows into the concrete culvert of the present invention from the intake channel, and a part of this cooling water is
One rising part → condenser → one falling part → one of the upper and lower spaces → the outlet part, and another part is the inlet part → the other one of the upper and lower spaces → the other part Rise section → condenser →
After flowing through the other trailing part → exit part as an alternating current, it finally flows out from the exit part of the culvert to the drainage channel.

[Embodiment] FIG. 1 (a) is a vertical cross-sectional view showing a facility configuration for flowing cooling water in and out of a condenser using a culvert according to one embodiment of the present invention, and FIG. It is a top view of a cooling water channel. The condenser 11 is installed on a foundation mat 25 of the turbine building 24, and in the foundation mat 25, a culvert C made of concrete according to the present invention, an intake channel 26 and a discharge channel 27 are formed. Is connected to the condenser 11 by rising portions 16 and 17 and falling portions 18 and 19.
Intake channel 28 and discharge channel 29 outside the turbine building 24
Is connected to an unillustrated steel pipe intake pipe and water discharge pipe. The lower surface of the foundation mat 25 of the turbine building including the intake passage 26, the drainage passage 27 and the culvert C is flat without any uneven portion.

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

The concrete culvert C has a box shape as shown in a perspective view in FIG. 2, has an inlet portion 30 and an outlet portion 31 on one end surface thereof, and has the rising portions at mutually diagonal positions on the upper wall. 16 and 17, and the falling portions 18 and 19 are connected diagonally to each other. The culvert C is actually formed integrally with the foundation mat 25 as a reinforced concrete structure.

FIG. 3 is a perspective view showing the upper wall and one side wall of the culvert C by virtually separating them in order to clearly show the structure thereof. The interior of the culvert is partitioned by a horizontal partition wall 32 into an upper space 36 and a lower space 37. The inlet section 30 is connected to the upper space 36 by the vertical partition wall 33, and the outlet section 31 is connected to the lower space 37 by the vertical partition wall 34. The space 38 defined by the vertical partition wall 35 communicates with the lower space 37,
The space 39 adjacent to the space 39 forms a part of the upper space 36. The rising portions 16 and 17 and the falling portions 18 and 19 are
They communicate with the inlet 30, the space 38, the space 39, and the outlet 31, respectively. Due to such a structure, a part of the cooling water entering from the inlet portion 30 flows out from the outlet portion 31 through the rising portion 16, the condenser 11, the falling portion 18, the space 38, and the lower space 37. Part of the upper space 36, space 37, rising portion 1
7, the condenser 11, and the falling portion 19, and then flows out from the outlet portion 31.

FIG. 4 shows the structure of another embodiment of the concrete culvert C, which is shown as the upper wall and one side wall thereof being virtually separated as in FIG. However, in this figure, the virtually separated upper wall and side wall are the same as those in FIG. 3, and therefore their illustration is omitted. In this embodiment, a partition wall 32 that is inclined with respect to the horizontal plane and a vertical partition wall 34 that obliquely extends from the partition wall between the inlet portion 30 and the outlet portion 31 toward one corner are provided.
2 and 34 end each other at their intersection. Partition wall 32
The space 36 above the space communicates with the inlet 30, the space 37 below the partition wall 32 communicates with the outlet 31, and the space 38 defined by the vertical partition wall 35 communicates with the space below 37. The space 39 of is a part of the upper space 36. Rise 16,
17, the falling portions 18 and 19 communicate with the inlet portion 30, the space 38, the space 39, and the outlet portion 31, respectively. Also in this embodiment, the same cooling water flow path as in the embodiment of FIG. 3 can be obtained. In this embodiment, since there is no right-angled partition wall 33, 34 near the entrance and exit of the culvert as in the embodiment shown in FIG. 3, the inflow / outflow resistance of the cooling water can be reduced.

Next, a construction procedure for constructing an equipment having the above concrete culvert will be described with reference to FIG.

In order to install the turbine building 24, the ground is excavated to the lower end level of the mat 25. Next, the reinforcing bar work of the mat 25 and the reinforcing bar work of the culvert C and the water discharge channels 26 and 27 are performed. After the reinforcement work is completed, concrete will be placed to form the mat section, culvert section and intake and discharge channel in one.
After that, building work is started, the condenser 11 is carried in, and the culvert C and the condenser 11 are connected by the rising pipes 16 and 17 and the falling pipes 18 and 19.

[Effect of the Invention] By providing the culvert of the present invention under the condenser,
Cooling water can flow into and out of the condenser by alternating current, and the thickness of the foundation mat of the turbine building can be made uniform, which reduces the required amount of ground excavation and reduces the amount of civil engineering required. Since the construction work can be shortened and the matting work and the culvert work can be carried out in parallel, the matting work and the turbine building work can be started earlier, and the construction work can be shortened. Further, by using concrete having a low thermal conductivity, the intake channel and the discharge channel can be integrated, and the installation area can be reduced. Furthermore, by making the bottom surface of the mat flat, it is possible to improve the earthquake resistance of the entire building and the workability.

[Brief description of drawings]

FIG. 1 (a) is an elevation sectional view showing a facility for flowing cooling water to a condenser using a concrete culvert according to an embodiment of the present invention, and FIG. 1 (b) is a plan view of the cooling water passage, 2 is a perspective view of the concrete culvert of the present invention, FIG. 3 is a perspective view showing the structure of the culvert of FIG. 2 by virtually disassembling it, and FIG. 4 is another concrete culvert of the present invention. FIG. 5 is a perspective view virtually disassembling the embodiment of FIG. 5, FIG. 5 is an elevation sectional view showing a conventional condenser cooling water inflow and outflow facility, and FIG.
The drawing is a plan view of the arrangement of the cooling water piping of the AC type in FIG. 1 ... Intake pipe, 2 ... Drain pipe 6,7 ... Rise part, 8, 9 ... Fall part 11 ... Condenser, 16, 17 ... Rise part 18, 19 ... Fall part, 24 ... Turbine building 25 ... Mat, 26 ... Intake channel 27 ... Drainage channel, 30 ... Culvert inlet 31 ... Culvert outlet 32, 33, 34, 35 ... Partition wall 36, 37, 38, 39 ... … Space C… Culvert

Front Page Continuation (72) Inventor Toshiaki Yoshinaga, 3-1-1 Sachimachi, Hitachi City, Ibaraki Hitachi Ltd. Hitachi factory (72) Inventor Sumio Iwashima 3-1-1, Saiwaicho, Hitachi City, Ibaraki Prefecture Issue: Hitachi, Ltd., Hitachi Works (56) References JP-A-52-131636 (JP, A) JP-A-63-268807 (JP, A)

Claims (4)

[Claims] 1. A box-shaped concrete culvert installed at the bottom of a condenser for letting cooling water flow in and out of the condenser, the cooling water having an inlet portion and an outlet portion on the front side. Has a pair of rising portions for discharging the cooling water to the condenser on the upper surface side in a diagonal positional relationship with each other, and a pair of falling portions for allowing the cooling water to flow from the condenser. Are provided in a diagonal positional relationship with each other, and a space that communicates the inlet portion and the pair of rising portions and a space that communicates the outlet portion and the falling portion are internally arranged in a vertical relationship with each other by partition walls. A concrete culvert for inflow and outflow of condenser cooling water, which is characterized by being formed. 2. A concrete culvert for inflow and outflow of condenser cooling water according to claim 1, wherein said 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 inclined from the inlet to the inner side. 4. The concrete mat, which is connected to the inlet and the outlet, respectively, is integrally formed in the foundation mat so that its lower surface is flat. Concrete culvert for inflow and outflow of condenser cooling water according to 2 or 3.