JP3025144B2 - How to build a fuel pool foundation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a fuel pool base for installing a spent fuel storage rack of a nuclear power plant.

[0002]

2. Description of the Related Art Referring to FIG. 5, a conventional method for constructing a foundation portion of a fuel pool will be described. After the upper end bar 10 is assembled, a support member 15 is fixed or welded to the upper end line 10, and then anchor bolts (anchor bolts) are used. 16, the adjustment bracket 16a and the bracket 17) are welded to the support member 15 (see w), and then the primary concrete 18 is cast.

Since the primary concrete 18 sinks as it solidifies, the level of the anchor bolts 16 is adjusted after the primary concrete 18 is cast. At this time, the welding part w between the metal fitting 17 and the support member 15 is cut off, the nut fixing the anchor bolt 16 to the adjusting metal fitting 16a is loosened, and the level is adjusted. Next, the nut is fastened again to cast the secondary concrete 19.

[0004]

In the conventional method for constructing the foundation of a fuel pool shown in FIG. 5, the rebar assembly and the anchor bolt setting are performed in this order. Moreover, since the rebar pitch (for example, 200 mm) and the anchor bolt pitch (for example, 160 mm) are different, the anchor bolt inevitably interferes with the rebar when setting the anchor bolt.
The above work is performed while loosening the binding of the rebar and moving and relocating the anchor bolts using lifting equipment such as jacks.

[0005] For this reason, a great deal of labor is required to avoid interference, and the work is carried out while being lifted by the lifting equipment, so that the number of man-hours for lifting work is increased and the work efficiency is poor. In addition, handling the lifting equipment entails danger in the work. The present invention has been made in view of the above-described problems, and the object thereof is to improve work efficiency. Also, the work can be performed safely. It is another object of the present invention to provide a method for constructing a fuel pool base part capable of improving the installation accuracy of anchor bolts.

[0006]

In order to achieve the above-mentioned object, a method for constructing a base portion of a fuel pool according to the present invention comprises the steps of: The vertical lower part of the support gantry is placed on the base surface, the horizontal upper part of the support gantry is located above the lower end muscle, then a sub-tem plate is installed at a predetermined position on the horizontal upper part of the support gantry, and Avoid the drilling position of the sub-tem plate and install it on the sub-tem plate, then set the vertical lower part of the fixing material on the horizontal upper part of the support base, and attach the horizontal upper part of the fixing material to the upper streak. Place the anchor bolts and turnbuckles unitized beforehand on the horizontal upper part of the fixing material, insert the anchor bolts into the holes of the sub-tem plate, and then remove the primary concrete from the base surface The level of the anchor bolts set in the area of the streaks and settled with the solidification of the primary concrete is adjusted to a predetermined level by a turnbuckle, and then the secondary concrete is cast on the primary concrete. I have.

[0007]

The method for constructing the basic portion of a fuel pool according to the present invention is constructed as described above. In constructing the basic portion of the fuel pool, the lower end streak is first assembled above the basic surface along the basic surface. After that, the vertical lower part of the support gantry is installed on the base surface, the horizontal upper part of the support gantry is located above the lower end muscle, and then the sub-tem plate is installed at a predetermined position of the horizontal upper part of the support gantry, Next, the upper end muscle is installed on the sub-tem plate, avoiding the drilling position of the sub-tem plate, and then the vertical lower part of the fixing material is installed on the horizontal upper part of the support base, and the horizontal upper part of the fixing material is installed. Is located above the top muscle, and the anchor bolts
Attach the turnbuckle to the horizontal upper part of the fixing material, insert the anchor bolt through the hole of the sub-tem plate, and then cast the primary concrete from the foundation surface to the upper end bar, and solidify the primary concrete The level of the anchor bolt that sinks with the above is adjusted to a predetermined level by a turnbuckle, and then the secondary concrete is cast on the primary concrete to complete the construction of the fuel pool base.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a method for constructing a base portion of a fuel pool according to the present invention will be described with reference to an embodiment shown in FIGS. FIG. 1 is a perspective view showing a plurality of sets of spent fuel storage racks installed in a fuel pool and a base part, FIG. 2 is a layout view of anchor bolts for mounting the spent fuel storage racks, and FIG. FIG. 2 is an enlarged view of a portion indicated by an arrow A of FIG. 2 and shows an adjacent portion of a storage rack assembly. FIG. 4 is a view taken along arrow B in FIGS.
It is a longitudinal side view which follows the -B line.

In constructing the base of the fuel pool, as shown in FIG. 4, a lower end bar 1 is assembled above the base along the base, and the vertical lower part of the support base 2 is set on the base. It is installed, and the horizontal upper part of the support base 2 is positioned above the lower end muscle 1. Next, the sub-tem plate 3 is set at a predetermined position in the horizontal upper part of the support base 2,
Is mounted on the sub-tem plate 3 while avoiding the perforated position of the sub-tem plate 3.

Next, the vertical lower part of the fixing member 5 is set on the horizontal upper part of the support base 2 and the horizontal upper part of the fixing member 5 is
The anchor bolt 6 and the turnbuckle 7, which have been unitized in advance, are attached to the horizontal upper portion of the fixing member 5, and the anchor bolt 6 is inserted into the hole of the sub-tem plate 3. Next, the primary concrete 8 is placed on the upper
And the level of the anchor bolts 6 sinking as the primary concrete 8 solidifies is adjusted to a predetermined level by the turnbuckle 7, and then the secondary concrete 9
Next, it is cast on concrete 8.

[0011]

As described above, according to the method for constructing the base portion of the fuel pool of the present invention, the lower reinforcement is installed above the base surface along the base surface, and then the vertical lower portion of the support base is installed on the base surface. , Position the horizontal upper part of the support base above the lower end streak, and then install the sub-tem plate at a predetermined position on the horizontal upper part of the support base, and then avoid the perforated position of the sub-tem plate with the upper end streak. Then, the vertical lower part of the fixing member is set on the horizontal upper part of the support base, and the horizontal upper part of the fixing member is positioned above the upper end streaks. Attach the bolts and turnbuckles to the horizontal upper part of the fixing material, and insert the anchor bolts into the holes on the sub-tem plate.
Work for avoiding interference between the building side (reinforcing bars) and the machine side (anchor bolts) can be eliminated, and work efficiency can be improved.

Since there is no need to handle the lifting equipment,
Work can be done safely. Further, since the anchor bolts and turnbuckles unitized in advance at a factory or the like are mounted on the horizontal upper portion of the fixing member and the anchor bolts are inserted into the holes of the sub-tem plate, the installation accuracy of the anchor bolts can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a plurality of sets of spent fuel storage racks installed in a fuel pool and a base part.

FIG. 2 is a layout diagram of the spent fuel storage rack mounting anchor bolts.

FIG. 3 is an enlarged view of a portion indicated by an arrow A in FIG. 2;

FIG. 4 is a longitudinal sectional side view taken along the line BB of FIG. 1 and FIG. 3 of one embodiment of the method for constructing the base portion of the fuel pool according to the present invention.

FIG. 5 is a vertical sectional side view showing a conventional method of constructing a foundation of a fuel pool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower end bar 2 Support stand 3 Sub-tem plate 4 Upper end bar 5 Fixing material 6 Anchor bolt 7 Turnbuckle 8 Primary concrete 9 Secondary concrete

──────────────────────────────────────────────────続 き Continued on front page Examiner Naohide Murata (58) Field surveyed (Int.Cl. ⁷ , DB name) G21C 19/06

Claims (1)

(57) [Claims] After the lower end muscle is assembled above the base surface along the base surface, the vertical lower part of the support base is installed on the base surface, and the horizontal upper part of the support base is positioned above the lower end muscle. Then, place the sub-tem plate at a predetermined position on the horizontal upper part of the support base, and then install the upper end streaks on the sub-tem plate avoiding the drilling position of the sub-tem plate, and then, Is installed on the horizontal upper part of the support base, the horizontal upper part of the fixing material is located above the upper end muscle, and the anchor bolts and turnbuckles that have been unitized in advance are attached to the horizontal upper part of the fixing material, An anchor bolt is inserted through the hole of the sub-tem plate, and then primary concrete is poured from the foundation surface to the upper end bar, and the level of the anchor bolt sinking as the primary concrete solidifies is checked. A method for constructing a fuel pool base, comprising adjusting a predetermined level to a predetermined level with a buckle and then placing secondary concrete on the primary concrete.