JPH0954183A - Installation method for linear plate of concrete-made containment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drastically shorten the construction period of a liner plate by providing a plurality of guide parts of which upper end bends outward a liner block. SOLUTION: By providing a plurality of guide members 20 projecting over the upper end of all blocks 18 except the uppermost liner block 18, it becomes possible to lower the upper side blocks 18 on the lower side block 18 and to accurately butt the both ends against each other. The length of the member 20 and the bend width of the guide body 20a are formed in the size observable the distortion of each block 18. On the contrary to the above, also by lowering the main body 20a to the lower part of all the blocks 18 except the lowermost block and placing it, a similar effect is obtained. Also, the main body 20a can directly fix the plate side constituting the block 18. In this manner, the effect of drastic shortening of the constructing period of a liner plate 10 can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing a metal liner plate integrally provided on the inner surface of a concrete containment vessel constituting a reactor building to seal the inside of the vessel. It is about.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional concrete containment vessel. As shown in the figure, in this concrete containment vessel, a substantially cylindrical cylindrical reactor pressure vessel 2 is housed in a reinforced concrete containment vessel body 1 formed in a cylindrical shape. The container 2 is supported and erected on a pedestal 3 which is erected in the center of the storage container body 1. Further, between the top of the pedestal 3 and the containment vessel body 1, a donut disk-shaped diaphragm floor 4 is provided.
Are horizontally bridged, and the upper dry well 5 and the pressure suppression chamber 6 in which the cooling water W is stored in the containment vessel body 1,
A partition is formed in the lower dry well 7. The concrete containment vessel body 1 partitions and forms the outer shell of the upper dry well 5, the pressure suppression chamber 6, and the lower dry well 7, and heat and radiation generated from the reactor pressure vessel 2 side leaks to the outside. It acts as a shield so that it does not come out.

A liner plate 10 made of a corrosion-resistant metal such as stainless steel having a plate thickness of about several mm is attached to the inner surface of the container body 1, the outer surface of the pedestal 3 and the like. As shown in FIG. 7, the liner plate 10 has a ring-shaped liner in which a plurality of plate bodies 16 each having a plurality of anchors 15 formed on one surface are connected in a ring shape so that the anchors 15 are located on the outer surface. A plurality of blocks 18, for example, five liner blocks 18a,
After forming 18b, 18c, 18d, 18e, these liner blocks 18a, 18b, 18c, 18d, 18
As shown in FIG. 4, the upper and lower end portions thereof are abutted against each other in order, and the upper and lower end portions are integrally connected in a multistage structure.
As shown in FIG. 6, the anchor 15 is embedded in the concrete slab that forms the containment body 1, so that the anchor 15 is fixed to the inner surface of the containment body 1 to seal the inside of the containment body 1. There is.

In the figure, 8 is a living body shielding wall which shields heat and radiation generated from the reactor pressure vessel 2 side, 9 is a pipe whip structure for supporting a piping system such as a main steam pipe (not shown), and 11 is A raise tunnel for accessing the inside of the lower dry well 7 from the outside, 12 a top slab that covers the upper opening of the PCV body 1, 13 an opening / closing lid that opens and closes when refueling the reactor pressure vessel 2, and 14 an upper dry This is a vent pipe that introduces high-temperature, high-pressure steam leaking into the well 5 to the pressure suppression chamber 6 side for cooling and condensation.

[0005]

By the way, a ring-shaped liner block 18 constituting the liner plate 10 is formed.
Has a plate thickness of about several millimeters, while its diameter is about 3 mm.
Since it will be about 0 m, when the lower end of the upper liner block 18 is abutted against the fixed lower liner block 18 upper end, for example, by using a crane, etc. Is deformed, and it is extremely difficult to butt them together with high precision. Therefore, conventionally, for the time being, after temporarily placing the upper liner block 18 on the fixed upper end of the lower liner block 18, the misalignment of the abutting portions is slightly adjusted by a large number of jigs called coma. Butt welding must be carried out in sequence while making corrections one by one, and a lot of labor and skill are required for the work, which leads to prolongation of the construction period of the entire liner plate 10.

Therefore, the present invention has been devised to solve the above problems, and an object thereof is to install a liner plate for a new concrete containment vessel capable of significantly shortening the construction period of the liner plate. To provide a construction method.

[0007]

In order to achieve the above object, a first aspect of the present invention is to provide a plurality of liners which are located on the inner surface of a cylindrical concrete containment vessel and which are embedded on the outer surface in the vessel body. In a method for installing a liner plate of a concrete containment vessel, which is obtained by butt-welding liner blocks equipped with anchors in upper and lower stages, in each of the above-mentioned liner blocks, the liner block projects further upward from the upper end and the upper end of the liner block After providing a plurality of guide members bent outward, lower the liner blocks on the upper stage side along the guide members to abut against the upper ends of the liner blocks on the lower stage, and then join the abutting portions. Then, these liner blocks are sequentially combined in a multi-step manner. In the second invention, the guide member is lined. Those attached to the lower end of the block. Further, a third invention is that the guide members are provided at a substantially equal pitch along the circumferential direction of the liner block, and a fourth invention is that the guide members are provided on the liner anchor side of the liner block. It was installed in.

As described above, according to the present invention, since a plurality of guide members are provided at the upper end portion or the lower end portion of each liner block so as to project above or below the liner block, the liner block on the lower stage and the liner on the upper stage are provided. Only by lowering the block, the lower end of the upper liner block is accurately butted along the guide member to the butted portion of the lower liner block. Therefore, it becomes possible to perform the welding operation of the butt portion at a plurality of positions at the same time, and the butt welding operation of the upper liner block and the lower liner block is efficiently performed. Also,
By providing the guide members at substantially equal pitches along the circumferential direction of the liner block, it is possible to perform the above-described accurate butting with a few guide members. Further, by providing the guide member on the liner anchor side of the liner block, the work of attaching the guide member is facilitated and the attachment strength is improved as compared with the case where the guide member is attached directly to the liner block. In this case, either the upper or lower liner anchor side comes into contact with the guide member and is guided.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, first, a plurality of liner blocks 18 are provided on the outer surface of each liner block 18, excluding the uppermost liner block (not shown). A plurality of guide members 20 are attached to any of the liner anchors 19 at equal intervals along the circumferential direction. This guide member 20 is
The guide main body 20a made of H steel is provided so as to project from the upper end of each liner block 18, and the liner anchor 1 made of T steel is provided by four sets of bolts and nuts 21.
It is vertically fixed so as to stand upright on the 9 ... side, and its upper end portion is sufficiently projected from the upper end portion of each liner block 18 and is bent outward in the radial direction.

Next, after mounting the plurality of guide members 20 in this way, as shown in FIG. 2, after fixing the lowermost liner block 18a, a crane or the like (not shown)
Is used to lower the upper liner block 18b to the upper end of the liner block 18a. At this time, when the liner block 18b on the upper stage side is deformed and a part thereof bulges outward in the radial direction, as shown in FIG. 1, the liner of the liner block 18b on the upper stage side in the bulging part is formed. When the corner portion 19a of the anchor 19 descends along the guide member 20 of the lower-side liner block 18a located therebelow, its deformation is gradually corrected, and as shown in the figure, its ends are accurately aligned. Will be matched. After that, if the ends are brought into contact with each other with high precision, the two will be brought into contact with each other with high precision only by finely adjusting the groove portion 10a formed in the butted portion, and the welding work of that portion should be performed immediately. You can afterwards,
By repeating such operations in sequence, the cylindrical liner plate 10 is formed. Then, by arranging reinforcing bars around the outer periphery of the liner plate 10 and then pouring concrete, the liner anchor 19 is embedded in the concrete slab, and the liner anchor 19 is integrally formed on the inner surface of the containment vessel body 1. The plate 10 will be formed. At this time, the guide member 20 may be removed if necessary, but it may be embedded in the concrete slab together with the liner anchor 19 without removing it.

As described above, according to the present invention, by providing a plurality of guide members projecting from the upper end portions of all the liner blocks except the uppermost liner block, the lower liner block shape and the upper line side block are formed. By lowering the liner block, it becomes possible to abut the two ends with high accuracy, so that it is not necessary to correct the position of the abutting part as in the conventional case, and the welding work can be greatly shortened. The length of the guide member 20 and the bending width of the guide body 20a are set to a size that allows the deformation of each liner block 18 to be converged. In this embodiment,
Although an example in which such a guide member 20 is provided at the upper end portion of each liner block except the uppermost liner block is shown, conversely, the above is provided at the lower end portions of all the liner blocks except the lowermost liner block. Even if such a guide main body is provided so as to hang down, the same effect as that of the above embodiment can be obtained. Further, the guide body may be directly attached to the plate side forming the liner block, and the mode is not limited to this embodiment.

Further, in the present embodiment, the liner plate formed on the inner peripheral surface of the storage container body 1 has been described as an example, but the liner plate located on the outer surface of the pedestal 3 described above, that is, the liner anchor is formed on the inner surface. The same can be applied to the formed liner plate.

[0014]

In summary, according to the present invention, as described above, since the guide member is provided on the liner block on the lower side, the liner plate on the upper side can be simply lowered to the liner block on the lower side. It is possible to bring the end portions into contact with each other with high accuracy, and it is possible to significantly reduce the construction period of the liner plate, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a partially enlarged side view showing an embodiment of the present invention.

FIG. 2 is a schematic perspective view showing one embodiment of the present invention.

FIG. 3 is a partially enlarged perspective view showing a portion A in FIG.

FIG. 4 is a perspective view showing a conventional liner plate installation method.

FIG. 5 is a vertical sectional view showing the structure of a conventional concrete storage container.

FIG. 6 (A) is a partially enlarged view showing a portion A in FIG. (B) is a partially enlarged view showing a B portion in FIG. 1.

FIG. 7 is a development view showing an example of a conventional liner plate.

[Explanation of symbols]

 1 Containment Vessel Body 10 Liner Plate 18 Liner Block 19 Liner Anchor 20 Guide Member

Claims (4)

[Claims] 1. A ring-shaped liner block, which is located on the inner surface of a cylindrical concrete containment vessel body and has a plurality of liner anchors embedded on the outer surface of the containment vessel body, is joined in a vertical multi-step manner. In a method of installing a liner plate for a concrete containment vessel that comprises, after providing a plurality of guide members on each of the above liner blocks, the guide members protruding further upward from the upper end portion and having the upper end portion bent outside of the liner block. After lowering these upper liner blocks along this guide member and abutting them on the upper ends of the lower liner blocks, the abutting parts can be joined and these liner blocks can be combined vertically in multiple stages. Characteristic concrete containment container liner plate installation method. 2. A ring-shaped liner block, which is located on the inner surface of a cylindrical concrete containment vessel body and has a plurality of liner anchors embedded on the outer surface of the containment vessel body, is joined in a vertical multi-step manner. In a method of installing a liner plate for a concrete containment vessel consisting of, after providing each of the liner blocks with a plurality of guide members that hang further downward from the lower end and have the lower end bent outside the liner block. While lowering the liner blocks on the upper stage side, the guide members are brought into abutment with the upper ends of the liner blocks on the lower stage side, and then the abutting portions are joined to successively combine these liner blocks in a multistage structure. A method for installing a liner plate for a concrete containment vessel. 3. The method for installing a liner plate for a concrete storage container according to claim 1, wherein the guide members are provided at a substantially equal pitch along the circumferential direction of the liner block. 4. The method of installing a liner plate for a concrete containment container according to claim 1, wherein the guide member is provided on the liner anchor side of the liner block.