JP3972408B2 - Top slab for concrete reactor containment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a nuclear reactor containment vessel, and relates to a top slab of a concrete containment vessel.
[0002]
[Prior art]
FIG. 3 shows a concrete reactor storage described in Technical Example 1: Japanese Utility Model Laid-Open No. 1-142898, Technical Example 2: Japanese Utility Model Laid-Open No. 2-021599, and Technical Example 3: Japanese Patent Application Laid-Open No. Hei 6-294886. The structural example of the container X is shown.
[0003]
The reactor containment vessel X is housed inside the reactor building 1 and has an airtight structure in which a steel liner 2C is disposed on the inner surface of a concrete side wall 2A and a top slab 2B. In addition, the reactor pressure vessel 3, the reactor pedestal 4, and the reactor shielding wall 5 are housed in the reactor containment vessel X, respectively, and the dry well 7 and the suppression chamber are accommodated by the reactor pedestal 4 and the diaphragm floor 6. 8 is divided.
[0004]
When constructing such a nuclear reactor containment vessel X, concrete is placed in a state where the side wall 2A is divided into a plurality of parts, and is erected together with the liner 2C. On the other hand, it is necessary to form the top slab 2B while supporting its weight.
[0005]
At that time, the liner 2C is disposed on the lowermost surface of the top slab 2B. Therefore, as shown in FIGS. 4 and 5, a plurality of liner anchors 2D and reinforcing flat bars are provided on the upper surface of the liner 2C. It is necessary to arrange 2E vertically and horizontally and to embed the liner anchor 2D and the reinforcing flat bar 2E in the concrete of the top slab 2B to ensure the overall strength.
[0006]
[Problems to be solved by the invention]
However, in the concrete wall of the top slab 2B, not only the liner 2C, the liner anchor 2D and the reinforcing flat bar 2E, but also reinforcing reinforcing bars are embedded. Since they are arranged in the direction and the vertical direction, the alignment between the liner anchor 2D and the reinforcing flat bar 2E does not coincide with each other.
[0007]
The present invention has been made in view of the above circumstances, and intends to achieve the following object.
(1) Simplify the attachment between the liner anchor and the reinforcing flat bar.
(2) Improve workability of top slab construction.
(3) To facilitate positioning during reinforcement work of reinforcing bars.
(4) Improving the degree of freedom of the installation position of the embedded metal fitting by reducing the interference between the reinforcing bar and the embedded metal fitting.
[0008]
[Means for Solving the Problems]
In the top slab of a concrete reactor containment vessel where the liner is lined on the inner surface of the concrete wall, the liner is lined on the lower surface of the top slab and the upper surface of the liner is integrally arranged in the circumferential direction. A technique is employed that includes a liner anchor that is connected to the liner anchor and a liner that is connected to the liner anchor and the liner and that is disposed in a radial direction.
A plurality of liner anchors are embedded in the concrete wall at intervals in the radial direction in a polygonal shape along a substantially circumferential direction.
The liner anchor is prepared by dividing it into a plurality of blocks by a dividing line in the radial direction before the construction of the top slab, and a technique of integrating the dividing line by welding at the time of assembly is adopted.
Between the liner anchors, a plurality of reinforcing reinforcing bars are arranged in an intervening state, and the reinforcing reinforcing bars are arranged in a plurality of stages in the circumferential direction and the radial direction and in the vertical direction. In the top slab, a plurality of liner support beams are arranged in the radial direction, and the liner is arranged in a suspended state on the liner support beams via auxiliary reinforcing bars.
The liner anchor, the reinforcing flat bar, the reinforcing reinforcing bar, and the liner support beam are embedded in the concrete wall.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a top slab of a concrete reactor containment vessel according to the present invention will be described with reference to FIGS. 1 and 2.
1 and 2, reference numeral 11 is a top slab, 12 is a concrete wall, 13 is a liner, 14 is a liner support beam, 15 is a reinforcing bar, 16 is a reinforcing flat bar, and 17 is a liner anchor (cutty). is there.
[0010]
In the top slab 11, a liner 13, a liner support beam 14 that supports the liner 13, a reinforcing bar 15, a reinforcing flat bar 16, and a liner anchor 17 are embedded in a concrete wall 12. Is formed.
[0011]
The liner 13 is a steel plate disposed in a lining state on the lower surface of the top slab 11 in order to maintain the airtightness of the reactor containment vessel X, and is welded in the radial direction and the circumferential direction along the lower surface of the top slab 11. The jointed piece is used.
[0012]
As shown in FIG. 2, the liner support beam 14 is arranged along the radial direction in a horizontal state, and when the top slab 11 is constructed, the liner 13, the reinforcing reinforcing bar 15, the reinforcing flat bar 16, etc. In addition to supporting various equipment, it is also used as a work platform.
[0013]
The reinforcing bars 15 are arranged in a plurality of stages in the circumferential direction, the radial direction, and the vertical direction to reinforce the concrete wall 12 and, for example, as shown in FIG. The liner 13 is suspended.
[0014]
The reinforcing flat bar 16 is arranged in the radial direction of the top slab 11 and reinforces the liner 13 together with the liner anchor 17.
[0015]
In the example of FIG. 1, the liner anchors 17 are formed in a polygonal shape, and a plurality of the liner anchors 17 are integrally disposed on the upper surface of the liner 13 with an interval in the radial direction.
Specifically, as shown in FIG. 1, the liner anchors 17 are arranged substantially in the circumferential direction of the top slab 11, and a plurality of circumferential reinforcing bars 15 are interposed therebetween.
[0016]
In the case of the top slab 11 having such a configuration, as shown in FIG. 2, a plurality of liner support beams 14 supported by the side wall 2A are arranged in the radial direction toward the central axis. As shown, the auxiliary rebar 18 suspends the liner 13, the reinforcing bar 15, the reinforcing flat bar 16, the liner anchor 17, etc., and aligns each. At this time, for example, the liner anchors 17 are polygonal and arranged in the substantially circumferential direction, and the reinforcing flat bars 16 are arranged in the radial direction, so that they coincide with the horizontal directions of the reinforcing reinforcing bars 15 and Interference at the time of installing the liner anchor 17 is reduced.
[0017]
Further, in the case of the top slab 11, by forming a necessary part in the factory, transporting it to the reactor installation site, lifting it with a crane or the like, and adopting an assembly method, the labor can be further reduced. Can do. When the liner anchor 17 has a polygonal shape, a part divided into a plurality of blocks by a dividing line L extending from the corner to the center of the radius is prepared in advance, and the part of the dividing line L is welded or the like at the time of assembly. Technology is adopted.
[0018]
【The invention's effect】
The top slab of the concrete reactor containment vessel of the present invention has the following effects.
(1) The liner anchors are arranged in a polygonal shape or the like along the circumferential direction with a gap in the radial direction, and the liner anchors are connected to the reinforcing flat bar and arranged in the radial direction so that the liner anchors are arranged. And the reinforcement flat bar can be simplified.
(2) The construction workability of the top slab can be improved by reducing the interference between the liner anchor and the reinforcing reinforcing bar and simplifying the mounting property between the liner anchor and the reinforcing flat bar.
(3) By preparing the top slab in a state of being divided into a plurality of blocks in advance and integrating it at the time of attachment, positioning of the top slab at the time of installation can be facilitated, and workability is improved Can be planned.
(4) With the above, it is possible to improve the transportability of the top slab.
(5) By arranging the liner anchors in a polygonal shape with a space in the radial direction, in addition to reducing the interference between the reinforcing bars and the embedded bracket, the position flexibility can be increased even when installing the embedded bracket. It is possible to improve and prepare for installation of various devices.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a top slab of a concrete reactor containment vessel according to the present invention.
FIG. 2 is a view taken along the line II-II in FIG.
FIG. 3 is a front sectional view showing a conventional example of a concrete reactor containment vessel.
FIG. 4 is a plan view in which some descriptions showing a conventional example of a top slab are omitted.
FIG. 5 is a front sectional view of the liner and the liner anchor shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reactor building 2A Side wall 2B Top slab 2C Liner 2D Liner anchor 2E Reinforcing flat bar 3 Reactor pressure vessel 4 Reactor pedestal 5 Reactor shielding wall 6 Diaphragm floor 7 Dry well 8 Suppression chamber 11 Top slab 12 Concrete wall 13 Liner 14 Liner support beam 15 Reinforcing bar 16 Reinforcing flat bar 17 Liner anchor 18 Auxiliary reinforcing bar K Embedded bracket L Dividing line X Reactor containment vessel

Claims (6)

A top slab of a concrete reactor containment vessel in which a liner (13) is arranged in a lining state on a concrete wall (12), the liner arranged on the lower surface of the top slab (11), and the upper surface of the liner A concrete anchor having a liner anchor (17) disposed substantially in the circumferential direction and a reinforcing flat bar (16) disposed in a connected state and radially with respect to the liner anchor and the liner. The top slab of the containment vessel. The top slab of a concrete reactor containment vessel according to claim 1, wherein a plurality of liner anchors (17) are embedded in the concrete wall (12) in a polygonal shape with a radial interval. 3. The concrete atom according to claim 1, wherein the liner anchor (17) is divided into a plurality of blocks by a dividing line (L) in the radial direction, and is integrated by welding the divided portions at the time of assembly. Top slab for reactor containment. The top slab of a concrete reactor containment vessel according to claim 1, 2 or 3, wherein a plurality of reinforcing bars (15) are arranged between the liner anchors (17). The top slab of a concrete reactor containment vessel according to claim 1, 2, 3, or 4, wherein the reinforcing reinforcing bars (15) are arranged in a plurality of stages in the circumferential direction and the radial direction and in the vertical direction. A plurality of liner support beams (14) are arranged in the radial direction, and the liner (13) is arranged in a suspended state on the liner support beams via auxiliary reinforcing bars (18). A top slab of a concrete reactor containment vessel according to 1, 2, 3, 4 or 5.

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