JPH0814206B2 - Lining tank and lining tank construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a lining tank and a method for constructing a lining tank.

(Prior Art) In a nuclear power plant, a lining tank is arranged, for example, as shown in the horizontal sectional view of FIG. A building 1 of a nuclear power plant is formed by a concrete wall 2. The lining tank 3 is formed by applying a stainless steel lining plate 4 to the concrete wall 2.

FIG. 3 is a vertical sectional view of a conventional lining tank. The lining tank 3 is lined with the tank upper chamber 11 by the upper lid 10.
It is divided into 12. Above the lining tank 3, a tank upper floor 15 in which control equipment such as a board 13 and a fan 14 required for the plant are installed is formed. This tank upper floor 15 is used as a temporary storage space for construction materials and equipment for the lining 12, and the monorail for carrying in and out is installed on the tank upper floor ceiling 16.
It is common to prepare 17 as temporary equipment. The lining 12 is welded to the lining plate 4 made of stainless steel having a predetermined size, for example, 3000L × 1500W, and the side wall portion is joined.
18 and a floor 19 are formed. A base material 20 for fixing the lining plate 4 by welding is embedded inside the side wall portion 18 and the floor portion 19. The base material 20 is usually H steel.

 A conventional method for constructing a lining tank will be described.

The construction of the lining tank 3 is divided into a first-stage construction in which the base material 20 is installed according to the construction of the building 1 shown in FIG. 2 and a second-stage construction in which the lining board 4 is attached after the construction of the building 1.

After the setting of the bar arrangement 21 of the floor portion 19 is completed, the floor base material 20a assembled to the cross girder of H steel is installed, concrete is poured, and the construction of the floor portion 19 is completed. Next, the bar arrangement 21 of the side wall portion 18 of the lining tank 3 is set, and the wall base material 20b is installed in the same manner as the floor portion 19. The wall base material 20b is installed in two or three stages according to the level of concrete pouring. In this way, after the construction of the side wall portion 18 is completed, the construction of the tank ceiling 22 is followed by the construction of the tank upper floor wall 23 and the tank upper floor ceiling 16 in this order, and a series of one-phase construction is completed.

In addition, it is general to adopt the deck plate construction method for the tank ceiling 22 and the tank upper floor ceiling 16 for the purpose of early start of the installation work of the lining plate 4 in the second phase construction.

Here, the deck plate construction method means that during the curing period of the concrete 2a, 2b of the tank ceiling 22 and the upper ceiling 16 of the tank, the concrete 2a, 2b is constructed by the deck plates 24a, 24b and the beams 25a, 25b.
Is a construction method that supports Compared with the method of supporting from below by supporting work, the work can be done under training and the work of dismantling and removing the formwork can be deleted, so the construction period can be shortened by about 2 months.

Since the deck plate construction method has been adopted, the second phase construction will start one month after the concrete 2b is placed on the ceiling 16 of the upper floor of the tank.

A temporary opening 26 is provided in the tank ceiling 22 in order to carry in and out the welding machine (not shown), the lining plate 4, the construction scaffolding 25, etc. used in the second construction period into the lining tank 3. Also, prior to the start of the second phase construction, the monorail 17 is attached using the beam 25b of the deck plate construction method on the ceiling 16 of the upper floor of the tank.

When these preparations are completed, the second phase construction will be implemented. For the second construction, set scaffolding 25 for construction in lining tank 3,
Installation of wall lining board 4a, installation of upper lid 10, dismantling / carrying out scaffolding 25 for construction, installation of floor lining board 4b, temporary opening
26 It will be implemented according to the restoration procedure. When the restoration of the temporary opening 26 is completed, the installation of the panel 13, the fan 14, etc. is started on the upper floor 15 of the tank.

(Problems to be solved by the invention) By the way, in such a lining tank and a method of constructing a lining tank, the start of the second construction period is the ceiling upper floor ceiling construction 1
It was a month later, which was a factor in extending the construction period.

An object of the present invention is to obtain a lining tank and a method for constructing a lining tank that can shorten the construction period.

[Structure of Invention]

(Means for Solving the Problem) In order to achieve the above object, in the present invention, a concrete wall is lined to store a liquid, and a control facility necessary for a plant is provided above a tank ceiling. In the lining tank forming the upper floor of the tank, a temporary opening for construction is not formed in the ceiling of the tank, and an opening through which people and materials can enter and leave at the time of construction is formed in the upper part of the side wall of the concrete wall. Separates the lining tank, which is characterized in that plant equipment connected to the control equipment required for the plant is provided, and the tank upper floor having the control equipment required for the plant formed above Forming a concrete wall consisting of the tank ceiling, floor and side walls,
Material and equipment are carried in from the opening formed in the upper part of the side wall without forming a temporary opening for construction on the ceiling of the tank, and the material and the equipment are used to line the concrete floor and side wall. And a plant equipment connected to necessary control equipment of the plant arranged above the tank ceiling portion are provided in the opening, and a lining tank construction method is provided. .

(Operation) In such a lining tank and the method for constructing the lining tank, the material necessary for the second-stage construction is provided from the opening formed in the upper part of the side wall of the lining tank without forming the temporary opening for construction on the tank ceiling. Since the equipment is brought in, it is possible to start the second phase early without waiting for the wall and ceiling on the upper floor of the tank.
In addition, since the restoration work of the temporary opening of the tank ceiling can be deleted, it is possible to start the indoor construction on the upper floor of the tank early.

(Example) Hereinafter, one example of a lining tank and a method for constructing a lining tank according to the present invention will be described with reference to FIG.

FIG. 1 is a vertical sectional view of a lining tank. The lining tank 30 is separated by a top lid 31 into a tank upper chamber 32 and a lining 33. Above the lining tank 30, a tank upper floor 36 in which a panel 34 and a fan 35, which are control equipment necessary for the plant, are installed is formed. The lining tank 30 has a floor 37,
It is formed of a concrete wall including a side wall portion 38 and a tank ceiling 39 which is a ceiling portion. The tank upper floor 36 includes a tank ceiling 39, which is the floor of the tank upper floor 36, a tank upper floor wall 40, and a tank upper floor ceiling 41.
It is made of concrete walls. Bars 42 are set inside these concrete walls. Floor
A lining plate 43 is provided on the side wall portion 37 and the side wall portion 38.
The lining plate 43 is, for example, a stainless steel plate having dimensions of 3000 L × 1500 W. The lining 33 is formed by fixing the lining plate 43 to the base material 44. Side wall 38
An opening 45 is formed in the upper part of the. This opening 45
Includes plant equipment such as air conditioning ducts and cable trays.
46 penetrates. A deck plate construction method is applied to the tank ceiling 39, and a deck plate 47 and a beam 48 are installed. The upper lid 31 is attached to the beam 48.

Next, the construction method of the lining tank will be described. Floor
After the setting of 37 reinforcements 42, the floor base material 44a assembled to the girder of H steel is installed, and concrete is poured.

Next, set the bar arrangement 42 of the side wall portion 38 of the lining tank 30,
The wall base material 44b is installed similarly to the floor portion 37. This wall base material 44b is 2 to 3 depending on the concrete pouring level.
It is installed in stages. Next, the tank ceiling 39 is constructed by the deck plate construction method.

Prior to the second phase of construction, a lifting machine 49, stage 50, etc. will be prepared to carry in materials and equipment through the opening 45.

The second phase construction will be carried out in parallel with the construction of the tank upper floor 40 and the tank upper ceiling 41 one month after the completion of the tank ceiling 39 construction. For the second phase construction, set up scaffolding 51 for construction and wall lining board 43a
Are installed, the upper lid 31 is installed, the scaffold 51 for construction is disassembled and carried out, and the floor lining plate 43b is installed.

Then, the plant equipment 46 such as an air conditioning duct and a cable tray is installed in the opening 45, and the construction is completed.

In this embodiment, since the construction temporary opening is not formed in the tank ceiling, it is possible to prevent rainwater from entering, improve the environment during construction, and improve the quality.

Since restoration work of the temporary opening for construction does not occur, cleanliness can be maintained and quality can be improved. In addition, it is possible to start the indoor construction on the upper floor of the tank early.

The upper floor of the tank is not expected to be used for access during the second lining work, so the range of adoption of the deck plate method can be reduced. That is, if the deck plate construction method is not adopted, after the construction is completed, the deck plate having a thickness of about 75 mm and the beam having a thickness of about 150 mm do not remain, so that the space space can be effectively utilized.

Usually, plant facilities such as air-conditioning ducts and cable trays attached to passages are installed through the openings, so that the space space of the plant can be effectively utilized.

Of course, the deck plate construction method may be adopted for the ceiling of the upper floor of the tank depending on the construction situation.

〔The invention's effect〕

According to the present invention, since the temporary opening for construction is not formed on the ceiling of the tank, it is possible to prevent rainwater from entering and to maintain a good environment during construction, so that the quality can be improved.

Furthermore, since the restoration work of the temporary opening for construction does not occur, the cleanliness can be maintained and the quality can be improved. Further, since it is possible to quickly start the indoor construction on the upper floor of the tank, the construction period can be shortened.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a lining tank according to the present invention, FIG. 2 is a horizontal sectional view of a conventional building, and FIG. 3 is a vertical sectional view showing a conventional lining tank. 30 …… lining tank, 37 …… floor 38 …… side wall, 39 …… tank ceiling 43 …… lining plate, 43a …… wall lining plate 43b …… floor lining plate, 45 …… opening 46 …… plant Facility

Claims (2)

[Claims] 1. A lining tank in which a concrete wall is lined to store a liquid, and a tank upper floor having a control facility required for a plant is formed above the tank ceiling, in which the temporary ceiling for construction is provided on the tank ceiling. Without forming an opening, an opening is formed in the upper part of the side wall of the concrete wall where people and materials can enter and leave during construction, and plant equipment connected to the control equipment necessary for the plant is arranged in this opening. A lining tank characterized by being installed. 2. A concrete wall composed of a tank ceiling and a floor and a side wall partitioning a tank upper floor having control equipment necessary for a plant formed above is formed, and a temporary construction wall is constructed on the tank ceiling. Material and equipment are carried in through the opening formed in the upper part of the side wall without forming an opening, and the floor and side wall of the concrete are lined with the material and equipment, and then the opening is formed in the opening. A method for constructing a lining tank, characterized in that plant equipment connected to necessary control equipment is provided in the plant arranged above the tank ceiling.