JPH0637798U - Concrete floor containment diaphragm floor frame - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to reduce the work of removing temporary materials, facilitate the handling of the reinforcing bars in the diaphragm floor, and facilitate the construction of the diaphragm floor. [Structure] A structure for constructing a diaphragm floor 4 that horizontally bridges a concrete containment vessel 1 and a pedestal 3 formed inside thereof to partition a dry well 5 and a suppression chamber 6 into upper and lower parts. Radiation beams 13 are provided to horizontally and radially extend between the container 1 and the pedestal 3 to support the pipe support system 11 in the diaphragm floor 4 and the dry well 5, and each radiation beam is provided on the inner wall of the storage container 1. A pillar member 24 extending downward from the base member 13 is provided, and a reinforcing member 34 for supporting the radiation beam 13 from below from the pillar member 24 and the pedestal 3.
The feature is that 35 are connected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a diaphragm floor frame for a concrete containment vessel, and more particularly to a diaphragm floor frame for a concrete containment vessel that facilitates the construction of a diaphragm floor.

[0002]

[Prior art]

 In general, a diaphragm floor that separates a drywell from a suppression chamber is formed above and below a concrete containment vessel of a nuclear power plant.

That is, as shown in FIG. 4, a pedestal 3 for supporting the pressure vessel 2 is formed in the concrete containment vessel 1, and the pedestal 3 is horizontally placed between the pedestal 3 and the containment vessel 1. A diaphragm floor 4 made of reinforced concrete is formed. The diaphragm floor 4 separates a dry well 5 formed in the upper part and a suppression chamber 6 formed in the lower part.

In order to construct the diaphragm floor 4, a frame 7 assembled in a truss shape is attached below the diaphragm floor 4. The frame 7 is cantilevered on the outer peripheral wall of the pedestal 3 and extends horizontally toward the storage container 1. Therefore, after the frame 7 is assembled, the diaphragm floor 4 is formed by arranging and placing concrete.

[0005]

[Problems to be solved by the device]

 By the way, the frame 7 is removed after forming the diaphragm floor 4 as a temporary material. The diaphragm floor 4 supports the pipe support system such as the pipe whip structure 8 arranged in the dry well 5 from below. Therefore, the diaphragm floor 4 needs to have high strength. For this reason, the thick reinforcing bars (D51) are arranged vertically and horizontally in multiple stages vertically and horizontally on the diaphragm floor 4, making it difficult to handle the reinforcing bars and fixing the pipe whip structure 8 to the diaphragm floor. There was a problem that it became difficult to connect the embedded metal fittings embedded in No. 4 with the reinforcing bars arranged at a small pitch.

Further, since the frame 7 is removed, it is necessary to remove the high place, and it is necessary to cut the frame 7 into small pieces for removal. Further, since the frame 7 is simply constructed by extending it from the pedestal 3 in the horizontal direction, many temporary materials are required to mount the liner plate on the inner wall of the containment vessel 1, and a large amount of the frame including the frame 7 is required. There was a problem that it was necessary to remove the temporary materials.

The present invention was devised to effectively solve the above problems.

The present invention provides a diaphragm floor frame structure for a concrete containment vessel that facilitates the handling of the reinforcing bars arranged in the diaphragm floor, reduces the work of removing temporary materials, and facilitates the construction of the diaphragm floor. The purpose is to provide.

[0009]

[Means for Solving the Problems]

 The present invention relates to a structure for constructing a diaphragm floor that horizontally divides a concrete containment vessel and a pedestal formed inside it to separate a drywell and a suppression chamber from each other. Radiation beams for horizontally supporting the diaphragm support and the pipe support system in the dry well are provided horizontally, and pillars extending downward from the radiation beams are arranged on the inner wall of the containment vessel. A reinforcing material that supports the radiation beam from below is connected to the pillar material and the pedestal.

[0010]

[Action]

 Since the diaphragm floor is supported by the radiation beams, pillars, and reinforcements in this way, the reinforcing bars arranged on the diaphragm floor need only be thin, and the diaphragm floor can be easily constructed. In addition, the pillars serve as a reinforcing material for the liner plate installed on the inner wall of the PCV, and it is only necessary to remove a part of the pillars, which can reduce the removal of temporary materials.

[0011]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 2 and 3, a pedestal 3 for supporting the pressure vessel 2 is formed in the concrete containment vessel (RCCV) 1, and a pedestal 3 is provided between the pedestal 3 and the storage vessel 1. Has a reinforced concrete diaphragm follower (D / F) 4 that horizontally bridges them. The diaphragm floor 4 is configured to partition a dry well (D / W) 5 formed at the upper part and a suppression chamber (S / C) 6 formed at the lower part. As shown in FIGS. 1 and 2, a pipe whip structure (PWS) 8 for supporting pipes in the D / W and a pipe support system 11 such as a pipe support material 9 are arranged on the diaphragm floor 4. . In order to construct the diaphragm floor 4 formed in this way, a frame 12 is attached below the diaphragm floor 4.

In particular, the frame 12 has a radiation beam 13 that horizontally bridges the pedestal 3 and the inner wall of the storage container 1. The radiation beams 13 are radially extended between the pedestal 3 and the inner wall of the storage container 1 at predetermined intervals in the circumferential direction. Specifically, a reinforcing material 14 and a steel plate wall 15 are formed on the outer peripheral portion of the pedestal 3, one end of the radiating beam is connected to the steel wall 15, and the other end of the radiating beam 13 is provided with a reinforcing stud 16 in a storage container. It is connected to the inner wall of 1.

A seal plate 17 is laid on each radiation beam 13, and ring beams (garders) 18 and 19 for supporting a pipe support system 11 such as a pipe whip structure 8 are provided. Ribs 21 and 22 are formed on the ring beams 18 and 19, and the ends of the reinforcing bars 23 are welded to the ribs 21 and 22. The reinforcing bars 23 are connected in the vertical and horizontal directions via the ribs 21 and 22, and are arranged in a plurality of upper and lower stages.

Further, a column member 24 vertically provided along the inner wall of the storage container 1 is connected to the radiating beam 13, and the column member 24 has an upper end on the radiating beam 13 along the inner wall of the storing container 1. It has an upper pillar member 25 to which the parts are connected and a lower pillar member 26 extending from the lower end portion of the upper pillar member 25 to the bottom portion of the suppression chamber 6 that stores a predetermined liquid level. The upper pillar 24 is provided on a carbon steel liner plate 27 installed above the water level on the inner wall surface of the containment vessel 1, and the lower pillar 26 is a SUS liner plate installed below the carbon steel liner plate 27. 28 is provided. In addition, the upper pillar member 25 is fixed to the inner wall of the storage container 1 by three embedded hardware 31, 32, 33 arranged vertically.

Reinforcing members 34 and 35 that support the radiation beam 13 from diagonally below are connected to the pillar member 24 and the pedestal 3 formed in this way. The lower end of the pedestal side reinforcing member 34 is connected to the steel plate wall 15 of the pedestal 3 and the upper end thereof is connected to the radiation beam 13 directly below the ring beam 19 supporting the pipe support 9. On the other hand, the lower end portion of the column member side reinforcing member 35 is connected to the column member 24 toward the embedded metal fitting 31, and the upper end portion thereof extends obliquely upward and is provided directly below the ring beam 18 supporting the pipe whip structure 8. It is connected to the radiation beam 13.

In FIG. 2, reference numeral 36 is a repair / inspection platform (P / F), and 37 is a catwalk for walking.

Therefore, in order to construct the diaphragm floor 4, as shown in FIG. 1, first, the radiation beam 13, which is the frame 12, the column members 24 and the reinforcing members 34 and 35 are assembled, and the ring beam 18, After connecting the pipe supporting system 11 via 19, the concrete is placed by arranging on the radiation beam 13.

When the diaphragm floor 4 is constructed, the radiation beam 13 receives the weight of the diaphragm floor 4 and the load of the pipe support system 11. Particularly, a large load applied to the radiation beam 13 by the pipe whip structure 8 is distributed to both the reinforcing members 34 and 35, and a load distributed to the pedestal side reinforcing member 34 is received by the pedestal 3 and the column member side reinforcing member. The load distributed to 35 is received by the storage container 1 via the embedded fitting 31. Since the containment vessel 1 and the pedestal 3 receive the large load applied to the radiation beam 13 in this manner, the thin reinforcing bar 23 can be arranged on the radiation beam 13. Therefore, the reinforcing bar 23 can be handled easily, and the ring beams 18 and 19 supporting the pipe whip structure 8 and the like can be easily fitted together, so that the installation accuracy of the diaphragm floor 4 can be enhanced. In addition, since the frame 12 is left as the main structure, the work of removing the temporary material is significantly reduced, and the diaphragm floor 4 can be easily constructed.

In addition, when the liner plates 27, 28 are installed, the pillar material 24 serves as a reinforcing material for the liner plates 27, 28, and after the concrete of the diaphragm floor 4 has been cast, the upper pillar material 25 of the pillar material 24. However, it is only necessary to remove the lower column member 26 on the SUS liner plate 28 side, and a large amount of temporary material is not required for installing the liner plates 27, 28. Further, the platform 12 can be used to attach the platform 36 and the catwalk 37, and it is not necessary to provide an embedding metal fitting on the inner wall of the storage container 1 to attach the platform 36 and the catwalk 37.

[0021]

[Effect of device]

 In short, according to the present invention, the radiation beam supporting the diaphragm floor is hung between the inner wall of the containment vessel and the pedestal, and the column member connected to the radiation beam is provided on the inner wall of the containment vessel. Since the reinforcements that support the radiant beams are connected, the work of removing the temporary materials is greatly reduced, the handling of the reinforcing bars in the diaphragm floor is facilitated, and the diaphragm floor can be easily constructed.

[Brief description of drawings]

FIG. 1 is a sectional view showing a frame structure of a diaphragm floor of the present invention.

FIG. 2 is a cross-sectional view showing an entire concrete storage container.

FIG. 3 is a perspective view showing a frame structure of a diaphragm floor.

FIG. 4 is a cross-sectional view showing a frame structure of a conventional diaphragm floor.

[Explanation of symbols]

 1 Concrete containment vessel 3 Pedestal 4 Diaphragm floor 5 Drywell 6 Suppression chamber 11 Piping support system 13 Radiant beam 24 Columns 34, 35 Reinforcement

Claims (1)

[Scope of utility model registration request] 1. A structure for constructing a diaphragm floor for horizontally partitioning a concrete containment vessel and a pedestal formed inside thereof to partition a drywell and a suppression chamber vertically, wherein the containment vessel and the pedestal are provided. And a radiation beam for horizontally supporting the piping support system in the diaphragm floor and the dry well by horizontally laying between them and a column member extending downward from each radiation beam on the inner wall of the storage container. A diaphragm floor frame for a concrete containment vessel, wherein a reinforcing material for supporting the radiation beam from below is connected to the pillar material and the pedestal.