JPS632479B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing a concrete reactor containment vessel.

Conventionally, reactor containment vessels have been constructed with a pressure-resistant and airtight containment vessel body, and a separate concrete shielding wall has been installed around this to shield radiation. However, such devices had the disadvantage of being complex in structure and expensive to construct.
In order to solve these problems, concrete reactor containment vessels have been developed. This structure has a containment vessel body made of concrete that has pressure resistance and radiation shielding ability, and a liner is placed on the inner surface of the containment vessel body to provide airtightness. By the way, this liner receives a compressive load due to thermal expansion with the main body of the containment vessel, and may cause local deformation. For this reason, in the past, anchors 2... were provided protruding from the outer surface of the liner 1 as shown in Fig. 1, and these anchors 2...
The load generated on the liner 1 was distributed and supported by the main body of the containment vessel. By the way, in the past, reinforcing bars 3... were arranged outside of such anchors 2... and concrete was poured to form the containment vessel body 4. Therefore, if the integrity of the liner 1 and the containment vessel body 4 is not sufficient and a crack occurs on the inner surface of the containment vessel body 4, the anchor 2
...There was a possibility that it might come loose. In order to solve these problems, attempts were made to extend the anchor between the reinforcing bars, increase the integrity of the liner and the containment vessel body, and increase the strength of the reactor containment vessel. However, to do this, reinforcing bars must be placed between the anchors. By the way, in such a reactor containment vessel, in order to obtain the necessary strength, the ends of the reinforcing bars must be connected to each other during reinforcement work. To connect the ends of the reinforcing bars, first set the reinforcing bars in place, then move the reinforcing bars so that the ends collide with the ends of the reinforcing bars to be joined, and then use crimp sleeves, gas pressure welding, etc. It is necessary to contact you. In this case, the reinforcing bars placed in the vertical direction, that is, the vertical bars, can be suspended with a crane, etc., inserted between the anchors from above, and the ends of the vertical bars can be connected sequentially from the bottom vertical bars, so the reinforcement work is simple. It is relatively easy to insert reinforcing bars placed horizontally between the anchors, move them horizontally, align the ends, and align the ends. It is necessary to connect the parts. However, the reinforcing bars used in reactor containment vessels have large diameters and are heavy. For this reason, it is impossible to align the ends by inserting the transverse reinforcement between the anchors, placing it on the anchor, and then manually moving it in the horizontal direction. Therefore, in order to align the ends of the horizontal reinforcement, it is necessary to suspend the horizontal reinforcement using a crane or the like, but the anchors get in the way when suspending the horizontal reinforcement, making the work extremely difficult and time-consuming. There was a problem that caused inefficiency.

The present invention has been made based on the above circumstances, and its purpose is to provide a method for constructing a reactor containment vessel that allows reinforcing bars to be easily arranged between the anchors of the liner and has high work efficiency. It is in.

The present invention will be explained below based on examples. First, the structure of the reactor containment vessel to be constructed will be explained with reference to FIGS. 2 to 4. In the figure, 101 is the main body of the containment vessel, which is strongly constructed of reinforced concrete and has pressure resistance and radiation shielding ability. A large number of large-diameter vertical reinforcements 102 and horizontal reinforcements 103 are arranged inside the containment vessel main body 101 to reinforce the entire container. Furthermore, a liner 104 made of a relatively thin steel plate is tightly attached to the inner surface of the containment vessel main body 101.
This liner 104 provides airtightness. Also, on the outer surface of this liner 104, vertical anchors 105... and horizontal anchors 106...
is installed. These vertical anchors 105...
... and the horizontal anchors 106... are made of shaped steel and are arranged in a grid pattern. And these vertical anchors 105... and horizontal anchors 106
... are embedded in the containment vessel main body 101 and provide integrity between the containment vessel main body 101 and the liner 104. Further, these vertical anchors 105... and horizontal anchors 106... are extended to between the vertical bars 102... and the horizontal bars 103..., and the vertical bars 10...
2... and the horizontal reinforcements 103... are arranged between the vertical anchors 105... and the horizontal anchors 106.... And these vertical anchors 105...
...and the horizontal anchor 106... have reinforcing bar insertion holes 1
07... is formed, and the vertical stripes 102...
and horizontal bars 103... are these reinforcing bar insertion holes 107
...It is inserted inside.

Next, a first embodiment of the present invention will be described with reference to FIGS. 5 to 9. First, as shown in FIG.
04a is manufactured, and vertical anchors 105... and horizontal anchors 106... are welded to the outside of this liner division piece 104a. Reinforcing bar insertion holes 107 are formed in these vertical anchors 105 and horizontal anchors 106, respectively. Then, each reinforcing bar insertion hole 10 of the vertical anchor 105...
A shaft 108... is welded horizontally to the lower part of the support roller 1.
09... is rotatably attached. Note that these reinforcing bar insertion holes 107 may be shaped so that the width at the bottom becomes narrower as shown in FIG. In this way, the length of the width 108 . . . can be shortened, and its strength is improved. Then, as shown in FIG. 5, vertical bars 102 are inserted into the horizontal anchors 106 and reinforcing bar insertion holes 107, and temporarily fixed with wires or the like. In addition, each reinforcing bar insertion hole 107 of the vertical anchor 105 has a horizontal reinforcement 103 .
... is inserted, placed on top of each support roller 109, and temporarily fixed with a wire or the like. In addition, horizontal stripe 103...
are arranged in multiple layers, but in order to simplify the diagram and make it easier to understand, in FIG.
Shows only... Up to this stage, it is constructed within the factory. Then, the liner divided pieces 104a... constructed in this way are transported to the site, these liner divided pieces 104a... are installed at predetermined positions, and the liner 104 and vertical anchors 105...
and the horizontal anchors 106... are welded together. Then, the upper end of the vertical strip 102... is lifted up with a crane, etc., the temporarily fixed wire is removed, and the vertical strip 102 is moved.
After aligning its lower end with the upper end of the vertical strip of the liner split piece installed below, press the crimp sleeve.
Connect each other by gas pressure welding, etc. In this case, vertical strip 1
02... is suspended vertically and its lower end is aligned, so the connection work is easy. In addition, the temporarily fixed wires of the horizontal stripes 103 are removed, and the ends are moved in the circumferential direction to align the ends with the ends of the horizontal stripes of the adjacent liner division pieces 104a, and then the wires are crimped onto the sleeves 110... ...or connect by gas pressure welding, etc. In this case, transverse muscle 1
03... are supported by support rollers 109... and can be easily moved in the circumferential direction by human power or the like, making the work extremely easy and efficient. In this way, the entire liner 104 is constructed, and the vertical reinforcements 102 and the horizontal reinforcements 103 are arranged between the vertical anchors 105 and the horizontal anchors 106. Next, additional reinforcing bars are placed on the outside, formwork is installed, and the concrete is broken to complete the reactor containment vessel.

Note that the present invention is not necessarily limited to the first embodiment described above. For example, anchors 111 are attached to the outer surface of the liner 104 in the second embodiment shown in FIGS. 10 and 11 in the form of a three-dimensional frame,
The vertical reinforcements 103 and the horizontal reinforcements 104 are arranged between the anchors 111, and the shafts 108 are bridged between the anchors 111, and the support rollers 109 are attached to the shafts 108. The rolls 109 may support the horizontal strips 103.

Further, as in the third embodiment shown in FIG. 12, anchor bolts 112 are provided protruding from the outer surface of the liner 104, and support rollers 109 are rotatably attached to the anchor bolts 112. . . . may also be used as the shaft of the support roller 109 .

In this case, the tips of the anchor bolts 112 may be connected with an auxiliary anchor 113 made of shaped steel or the like.

Further, as in the fourth embodiment shown in FIG. 13, anchor bolts 115 are rotatably protruded from the outer surface of the liner 104 via bearings 114, and the anchor bolts 115 are used as support rollers. Good too. In this case, a frame-shaped anchor 116 made of shaped steel or the like is provided, and when the reinforcement work is completed, the anchor bolt 115 is pulled by the nut 117, and the looseness of the bearing 114 is removed. This anchor bolt 115... and liner 1
04 should be integrated.

Furthermore, the present invention is not limited to each of the above embodiments. For example, the liner and anchor do not necessarily have to be made into blocks, each block assembled at a factory, and then joined on-site, but the entire liner and anchor may be assembled on-site.

Further, the support roller may be made detachable, and the support roller may be removed when the reinforcement work is completed.

As described above, the present invention comprises the steps of constructing a liner with anchors protruding from its outer surface, attaching to the anchor a support roller with horizontal stripes that is rotatable about a horizontal axis, and installing a plurality of longitudinal support rollers between the anchors. Placing strips and connecting the ends of these vertical strips to each other, placing a plurality of horizontal strips on the support roller of the horizontal strips, moving these horizontal strips in the horizontal direction and bringing their ends into contact with each other. The process includes a step of connecting and a step of pouring concrete on the outside of the liner. Therefore, since the transverse reinforcements can be easily moved, it is extremely easy to align the ends of these horizontal reinforcements, and the reinforcement work is extremely efficient, resulting in great effects.

[Brief explanation of the drawing]

FIG. 1 is an enlarged vertical cross-sectional view of a part of a conventional example. 2 to 9 show a first embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the entire reactor containment vessel to be constructed, and FIG. 3 is a vertical cross-sectional view showing an enlarged part of the reactor containment vessel. Figure 4 is a sectional view taken along the - line in Figure 3, Figure 5 is a perspective view of the liner division, Figure 6 is a front view of the support roller and reinforcing bar insertion hole, and Figure 7 is the same as in Figure 6. 8 is a front view of the modified support roller and reinforcing bar insertion hole, and 9 is a sectional view taken along the - line.
The figure is a cross-sectional view showing the assembled state of the liner divided pieces. 10 and 11 show the second embodiment, FIG. 10 is a longitudinal sectional view showing the structure of the anchor and the arrangement of the support rollers, and FIG.
It is an arrow view. Further, FIG. 12 is a longitudinal sectional view showing the structure of the anchor and support roller of the third embodiment, and FIG. 13 is a longitudinal sectional view showing the structure of the anchor and support roller (anchor bolt) of the fourth embodiment. 101...Containment vessel main body, 102...Vertical strip, 1
03...Horizontal stripe, 104...Liner, 105...
Vertical anchor, 106...Horizontal anchor, 107...
Reinforcing bar insertion hole, 108... shaft, 109... support roller, 111... anchor, 112... anchor bolt, 114... bearing, 115... anchor bolt (support roller).

Claims (1)

[Claims] 1. A step of constructing a liner with an anchor protruding from the outer surface, and a step of attaching a horizontal support roller rotatable about a horizontal axis to the anchor,
A plurality of vertical reinforcements are arranged between the anchors, and the ends of these vertical reinforcements are connected to each other, and a plurality of horizontal reinforcements are placed on the horizontal reinforcement roller, and these horizontal reinforcements are moved horizontally to connect their ends. A method for constructing a nuclear reactor containment vessel, comprising the steps of abutting and interconnecting the liners, and pouring concrete on the outside of the liner.