JPH04285893A - Construction method of cylindrical reinforced concrete containment vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the construction of a reinforced concrete containment vessel, and particularly to a construction method suitable for a cylindrical reinforced concrete containment vessel and capable of reducing the number of construction steps and shortening the process.

0002

BACKGROUND OF THE INVENTION The prior art will be explained below.

FIG. 4 shows a containment vessel 1 made of reinforced concrete. This containment vessel is a reinforced concrete structure with a shell structure that has pressure resistance, leak resistance, and shielding properties, and is huge with an inner diameter of approximately 30 m and a height of approximately 30 m. However, since reinforced concrete does not have sufficient leakage resistance, a liner plate of approximately 6 mm steel must be installed inside the reinforced concrete.

[0004] When constructing this structure, first the steel liner plate 2 is made into one ring and is lifted using a large crane. However, in the conventional construction method, excessive deformation during hoisting cannot be controlled. Plate thickness 30mm, width 30mm at approximately 2m intervals
It is necessary to install reinforcing ribs 6 equivalent to 0 mm.

However, in order to maintain the pressure-resistant function of the containment vessel, if large diameter reinforcing bars (D51: different diameter reinforcing bars with a nominal diameter of 51 mm) 8 set in the concrete at 200 mm intervals are used as reinforcing materials when the liner is suspended. , the rigidity is approximately 3 times higher in terms of cross-sectional area ratio when using the large-diameter reinforcing bars 8 than when using the reinforcing ribs 6, and reliability is obtained for the lifting work.
It is possible to reduce unnecessary reinforcement materials.

[0006] Further, details of joining the large-diameter reinforcing bars and the steel liner are shown in FIG. Rebar support 10(a), 10(b)
The vertical stiffeners (5
) is set every few lines, and there are two lengths. Long supports 10(a) are installed at intervals of about 2 m in the height direction, and short supports 10(b) are installed between them. By providing two types of reinforcing bar supports in this way, the second row of cylindrical bars from the liner can also be supported by support 10 (a
) and can be hung at the same time.

[0007] The reinforcing bar supports 10(a) and 10(b) are
A box with a length and width of about 50 mm or channel steel is welded to the vertical stiffener 5. The length of the long support 10(a) is about 1 m, and the length of the short support 10(b) is about 50 cm. Circumferential reinforcing bars 8 and reinforcing bar supports 10
(a) and 10(b) are joined by a fixing band 11, which is threaded and fixed with bolts.

[0008] After the liner lifting work is completed, reinforcing steel work is carried out, and at this time, the reinforcing steel supports 10(a), 10
Using (b), the circumferential reinforcing bars 8 are fixed in the correct position and the reinforcing bars are assembled. In the above construction method, it is impossible to suspend the liner with the supports 10(a) and 10(b) bearing the burden of all the reinforcing bars that make up the containment vessel, including the longitudinal reinforcing bars. It is not possible to implement a good method of integrating all reinforcing bars and suspending the liner.

[0009] In addition, in the above construction method, the penetration part and the longitudinal reinforcing bars are not integrated, so the installation of the penetration part and the installation of the longitudinal reinforcing bars after the liner has been suspended with the 1 ring requires separate support. Therefore, it is necessary to attach each support so that it does not negotiate with the suspended liner. The area around the liner after it has been hoisted is surrounded by scaffolding for work, and the work space is narrow. Therefore, it is expected that work efficiency will decrease and a huge amount of man-hours will be required to install supports, penetrations, and vertical reinforcing bars. It is.

[0010] Furthermore, since the penetration parts, longitudinal reinforcing bars, and support materials can only be attached after the liner has been suspended, it is difficult to stack the liners in a ring shape when installing the penetration parts and longitudinal reinforcing bars. It is a critical path.

[0011]

[Problems to be Solved by the Invention] The problems of the present invention are to reduce the number of man-hours that occur in the installation work of the penetration section and longitudinal reinforcing bars after the liner has been suspended, and to prevent the penetration The objective is to clear the critical path where it is not possible to install vertical reinforcing bars.

0012

[Means for Solving the Problems] The penetration parts, the longitudinal reinforcing bars, and their respective support members are attached to the liner plate in a wide space above ground. Furthermore, rigidity is maintained by combining the circumferential reinforcing bars and the longitudinal reinforcing bars, and the lattice-shaped reinforcing bars support the liner and the penetration part, and the suspension wires are attached to both the liner and the lattice-shaped reinforcing bars. hang it up.

[0013]

[Operation] In addition to making the liner into one ring and attaching circumferential reinforcing bars, connecting longitudinal reinforcing bars to circumferential reinforcing bars to ensure rigidity with reinforcing bars alone, and integrating penetrations, longitudinal reinforcing bars, and supports into the liner. By assembling the liner and suspending the liner and reinforcing bars by hanging a suspension wire, it becomes possible to suspend the penetration part, liner, and reinforcing bars in one piece. This allows work to proceed in parallel on each stage of the liner that is horizontally divided on the ground.

[0014] Furthermore, since the work is carried out in a wide space on the ground, it is easy to incorporate supports, penetrations, and longitudinal reinforcing bars. The above results reduce man-hours, improve work efficiency,
You can clear the critical path.

[0015]

[Example] The present invention will be explained below.

FIG. 4 shows a reinforced concrete containment vessel 1 to which the present invention is applied. This containment vessel is a reinforced concrete structure with a shell structure that has pressure resistance, leak resistance, and shielding properties, and is huge with an inner diameter of approximately 30 m and a height of approximately 30 m. However, since reinforced concrete does not have sufficient leakage resistance, a liner plate 2 made of a steel plate of about 6 mm must be provided inside the reinforced concrete.

When constructing this structure, the steel liner plate 2 will first be used as one ring and lifted using a large crane, but the process up to the integration of the following four items will be carried out horizontally. This is done in parallel for each stage of each ring of the divided liner plate 2. Figure 1 about the state of integration
~Explained using FIG. 3.

When the liner plate 2 is shipped from the factory, it is transported to a plant construction site as a bent plate constituting a liner cylinder. Only the liner anchor 5 and flat bar 14 are attached to the liner plate 2 during shipping.

The penetrating portion 9 is transported to a plant construction site as a single piece with the outer flange plate 12 and the inner flange plate 13 assembled.

Other longitudinal reinforcing bars 7, circumferential reinforcing bars 8, supports 8, fixing bands 11, and reinforcing bar connectors 16 are also transported as individual items to the plant construction site.

The liner plate 2 is welded in a ring shape for each horizontally divided suspension stage. Since this work is carried out on the ground within the construction site, it is easy to bring in equipment such as welding machines to install scaffolding, etc.

Next, the through portion 9 to which the inner flange plate 13 and the outer flange plate 12 are attached is attached to the ring-shaped liner plate 2. The liner plate 2 is cut out along the shape of the inner flange plate 13, and the outer flange plate 1 is inserted into the liner plate 2.
3 is fitted and after welding the entire circumference, liner anchor 13
are added from the top and bottom and essentially serve as fixed supports.

Next, the support 10 is welded onto the flange surface of the liner anchor 5. The supports 10 are arranged around the entire circumference and have a shape that protrudes horizontally on the implementation side.

The support 10 has two bolt holes for fixing bands 11 for attaching the longitudinal reinforcing bars 7 and the circumferential reinforcing bars 8 for each fixing band 111, indicating the fixing positions of the reinforcing bars.

Next, the circumferential reinforcing bar 8 is attached to the support 10 with a fixing band 11.

The fixing band 11 is inserted into a bolt hole formed in the support 10 with the circumferential reinforcing bar 8 sandwiched therebetween, and the circumferential reinforcing bar 8 is attached by tightening it with a nut from the back. At the same time, the longitudinal reinforcing bars 7 and the circumferential reinforcing bars 8
The reinforcing bars that are attached to the support 10 and form the frame of the reinforced concrete containment vessel 1 are assembled in a lattice manner using the same attachment method as in the above. If there is no space to attach a large number of supports 10 at this point, the rigidity of the lattice structure is ensured using reinforcing bar connectors 16.

After that, the liner plate 2 in which the penetration part 9, the circumferential reinforcing bars 8, the longitudinal reinforcing bars 7, and the supports 10 are integrally assembled is in a ring shape and a suspension wire 15 is attached to the liner and the grid shape to the starting point of the containment vessel. It will be hung on both reinforcing bars.

Regarding the connection of each stage, the longitudinal reinforcing bars 7 are screwed together with reinforcing plastic, and the liner plate 2 and liner anchor 5 are welded to complete the hanging.

By assembling the process of assembling and suspending the liner plate 2 as much as possible in a place with a wide working space, most parts can be installed in a narrow space at the start-up point of the containment vessel. This is a construction method that can significantly shorten the construction process, as it improves efficiency and allows each stage of liner plates 2 to be assembled on the ground in parallel.

Regarding the above-mentioned fixation of the circumferential reinforcing bars 8 and the longitudinal reinforcing bars 7, as an applied example, there is a method of welding the circumferential reinforcing bars 8 and the longitudinal reinforcing bars 7 together, or a method of welding the circumferential reinforcing bars 8 and the longitudinal reinforcing bars 7 together, or a method of fixing the circumferential reinforcing bars 8 and the longitudinal reinforcing bars 7 to the support 10 without using the fixing band 11. One possible method is welding.

[0031]

[Effects of the Invention] According to the present invention, work efficiency is improved to avoid mutual negotiations that occur when installing penetration parts and reinforcing bars, which are problems when installing a reinforced concrete containment vessel. Since work can proceed in parallel to the installation of reinforcing bars, liner plate installation is removed from the critical path. This makes it possible to significantly shorten the construction period and reduce construction costs.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing a suspended state of a large module according to the present invention, in which a ring-shaped liner plate is integrated with a penetrating portion, reinforcing bars, and a support.

FIG. 2 is a longitudinal cross-sectional view of the vicinity of the penetration portion of the large module in FIG. 1;

FIG. 3 is a perspective view showing a fixed state of vertical reinforcing bars, circumferential reinforcing bars, and supports in FIG. 1;

FIG. 4 is a longitudinal sectional view of the entire reinforced concrete containment vessel.

FIG. 5 is a perspective view showing a conventional module in a suspended state.

FIG. 6 is a perspective view showing a conventional integrated structure of a liner plate and reinforcing bars.

[Explanation of symbols]

1... Reinforced concrete containment vessel, 2... Liner plate, 3... Reactor pressure vessel, 4... Foundation of reactor body, 5... Liner anchor, 6... Reinforcement ring, 7... Vertical reinforcing bars, 8... Circumferential reinforcing bars, 9... Penetration part, 10... Support, 11... Fixed band, 12... Outer flange plate, 13... Inner flange plate, 14... Flat bar, 15... Hanging wire.

Claims (1)

[Claims] Claim 1: In a reinforced concrete containment vessel in which an inner steel liner forming a cylindrical boundary is used as a mold for concrete pouring, a penetration part is attached to the cylindrical liner on the ground, and the liner is connected to the liner anchor. The reinforcing material that supports the circumferential reinforcing bars and the longitudinal reinforcing bars is fixed, the circumferential reinforcing bars and the longitudinal reinforcing bars are connected to this, and the liner, the penetrating part, the circumferential reinforcing bars, and the longitudinal reinforcing bars are integrated and suspended. Construction method for a cylindrical reinforced concrete containment vessel.