JP2504108B2 - Construction method of reactor containment vessel - Google Patents

Description

The present invention relates to a method for constructing a reactor containment vessel in which a seismic shear lug mechanism is provided between a steel wall and a concrete living body shield wall.

"Prior art" The reactor containment vessel is equipped with various types of seismic devices to maintain high soundness during an earthquake, and the atomic structure has a double structure consisting of a steel wall and a concrete biological shielding wall. In the furnace containment vessel, for example, a plurality of shear lug mechanisms are provided between these walls at circumferential intervals. The shear lug mechanism engages a male type and a female type,
The relative movement of both walls in the vertical direction is allowed, and the relative movement of the left and right directions is restricted.

Conventionally, when constructing a reactor containment vessel having such a shear lug mechanism, as shown in the example of FIG. 4, the steel wall 1 is first erected, and the male type 3 and the female type 4 of the shear lag mechanism 2 are installed. The male part 3 is fixed to the steel wall 1 in a state in which the engaging portion with and is fastened by a plurality of temporary bolts 5 along the left-right direction, and concrete is provided with a gap between the male wall 3 and the steel wall 1. After constructing a casting mold 6 and the like and fixing the female mold 4 of the shear lug mechanism 2 by the mold 6 and the like, the temporary bolts 5 are removed to release the fastening state, and then the mold 6 The living body shielding wall 7 is constructed by placing concrete on the outside. Reference numeral 8 in the figure is a female type 4 of the shear lug mechanism 2.
It is a foundation bolt that is integrally arranged on the back of the.

[Problems to be Solved by the Invention] However, when the temporary bolts 5 are removed, the temporary bolts 5 are likely to interfere with the foundation bolts 8 and the work is performed in a narrow space S between the mold 6 and the steel wall 1. There is a problem that workability is poor.

The present invention has been proposed in view of the above circumstances, and an object thereof is to facilitate removal of the temporary bolt and improve workability.

"Means for Solving the Problem" When constructing a reactor containment vessel in which a seismic shear lag mechanism is provided between a steel wall and a concrete biological shielding wall, one of the male and female types of the shear lug mechanism A through hole and a screw hole are formed in the other side, and a collar that can be divided into the temporary bolt is externally fitted with the temporary bolt attached to the screw hole, and then the through hole is externally fitted to the temporary bolt. The male type and the female type are combined with each other, and the other side of the male type and the female type is erected against the steel wall while setting the facing position of the male type and the female type with collars by fastening using temporary bolts. In addition to fixing, one of the male type and the female type is fixed with the concrete pouring formwork and the reinforcing bar, and then the temporary bolt is pulled out from the other side of the male type and the female type and the connected state is released. , Mosquito A construction method is adopted in which the ra is removed from between the male type and the female type, and then concrete is cast on the outside of the formwork to construct a concrete biological shielding wall.

"Action" With the collar interposed between the male and female types,
The male and female dies are fastened to each other with temporary bolts, and the male and female dies and the collar are brought into contact with each other, whereby the opposing positions of the male and female dies are set.

The opposite positions of the male type and the female type, the male type and the female type, after fixing the steel wall, the concrete placing formwork and the reinforcing bar, the state where the temporary bolt is pulled out, and the male type and the female type. Even if the color is divided and removed from between
It is kept as it is.

Tightening and pulling out of the temporary bolts are performed from the back side of the shear lug mechanism regardless of the narrow space between the male type and the female type, and the collar removal work is performed by shifting horizontally between the male type and the female type. Done.

[Example] An example of the construction method of the present invention will be described below with reference to FIGS. 1 to 3.

Explaining in advance the shear lug mechanism used in the construction method of the present invention, the shear lug mechanism 11 has a rectangular block-shaped male type 3 as shown in FIGS. 2 and 3.
And a female die 4 that engages with the male die 3 at a slight interval.
A plurality of basic bolts 8 to be embedded in the biological shielding wall 7 are erected on the back plate 12 of the female die 4, and the temporary bolts 5 along the facing direction of the male die 3 and the female die 4 are formed. Backboard
It is screwed into a screw hole 13 of the male die 3 in a state of penetrating 12 and fixed by a nut 14 on the upper surface of the back plate 12. In this case, the through hole 15 of the back plate 12 is formed slightly larger than the outer diameter of the temporary bolt 5 so that a gap g is formed between the through hole 15 and the temporary bolt 5.

Further, between the male type 3 and the female type 4, collars 16A and 16B for keeping the space between them fixed are provided with the temporary bolt 5.
It is provided in a state of being extrapolated to The color 16A, 16B
Is a two-divided structure, and the upper collar 16A has a cylindrical guide portion inserted into the gap g of the through hole 15 of the back plate 12.
17 and a flange 18 abutting against the lower surface of the back plate 12 are integrally formed, and a fall prevention operation wire 19 made of wire or the like is connected so as to connect both the collars 16A and 16B.

And when constructing the steel wall 1 and the concrete biological shielding wall 7 with such a shear lug mechanism 11 interposed,
First, the steel wall 1 is erected, and the male type 3 of the shear lug mechanism 11 fastened to the steel wall 1 by the temporary bolts 5 is fixed to the steel wall 1, as shown in FIG. Next, on the outside of the steel wall 1, a concrete placing form 6 and a reinforcing bar 20
Then, concrete is placed on the outside of the form 6, and in the vicinity of the shear lug mechanism 11, the work of fixing the female mold 4 is carried out.

That is, as shown in FIG. 1 (b), the mold 6 and the reinforcing bar 20 are fixed to the back plate 12 of the female mold 4 to form a concrete layer 21 up to the position below the shear lug mechanism 11, and A steel material 22 such as H steel is embedded in the concrete layer 21 and its upper end is exposed from the concrete layer 21. Then, as shown in FIG. 1 (c), the steel material 22
Is connected to the back plate 12 of the female type 4.

In this way, after fixing the female mold 4 with the mold 6, the reinforcing bar 20 and the steel material 22, the temporary bolt 5 is pulled out,
The fastening state between the male type 3 and the female type 4 is released, and the collars 16A and 16B (not shown in FIG. 1) are removed from between them. In this case, since the collars 16A and 16B have a two-part structure, if the temporary bolt 5 is pulled out and then pulled by the operation line 19, the lower collar 16B moves laterally from below the upper collar 16A. By dropping the upper collar 16A from the gap g, these can be removed from between the male die 3 and the female die 4.

Then, as shown in FIG. 1 (d), the back plate of the female die 4
The upper concrete layer 23 is formed on the concrete layer 21 so as to cover 12 to complete the living body shielding wall 7. In this case, the through hole 15 of the back plate 12 is closed by the plug 24.

That is, in this construction method, the temporary bolt 5 is provided along the facing direction of the shear lug mechanism 11 and is exposed from the back plate 12 of the female die 4, so that the female die 4 is fixed by the form 6 or the like. Even after this, the temporary bolts 5 can be easily removed from the outside of the mold 6, work in the narrow space S between the mold 6 and the steel wall 1 can be avoided, and workability is improved. It is remarkably improved. Further, the temporary bolt 5 can also be used as a guide jig for aligning the male die 3 and the female die 4 when the shear lug mechanism 11 is manufactured in a factory or the like.

In addition, although the dividing line of the collar is orthogonal to the axial direction in the example of FIG. 3, if it is slightly inclined, the lateral movement and the upper side of the lower collar after the temporary bolt 5 is pulled out Colors can be dropped efficiently.

"Effects of the Invention" As is clear from the above description, according to the method for constructing a reactor containment vessel of the present invention, the following effects can be achieved.

(I) Since the temporary bolts along the opposing direction of the shear lug mechanism are exposed to the outside of the shear lug mechanism, the temporary bolts can be easily removed from the outside even after the formwork is constructed. Therefore, work in a narrow space between the formwork and the steel wall can be avoided, and workability can be significantly improved.

(Ii) Since the temporary bolt is provided in the direction opposite to the shear lug mechanism, it can be used as a guide jig for aligning the male type and the female type.

(Iii) When assembling the shear lug mechanism, after the temporary bolt is screwed in, the collar may be externally fitted to the temporary bolt, and one of the male type and the female type may be externally fitted and fixed to the temporary bolt. Work can be carried out easily and efficiently.

(Iv) In addition, the position where the male type and female type face each other can be set simply by interposing the collar between the male type and the female type, and after pulling out the temporary bolt, shift the collar sideways. It can be easily removed.

[Brief description of drawings]

1 (a) to 1 (d) are longitudinal sectional views of a main part showing an embodiment of a construction method of the present invention in the order of steps, and FIG. 2 is a detailed sectional view of a shear lug mechanism in FIG. FIG. 4 is an enlarged view of the vicinity of the temporary bolt in the shear lug mechanism, and FIG. 4 is a transverse cross-sectional view showing a state during construction in the conventional construction method. 1 ... Steel wall, 3 ... Male type, 4 ... Female type, 5 ... Temporary bolt, 6 ... Concrete casting formwork, 7 ... Biological shield wall, 8 ... Foundation bolt, 11 ... … Cialag mechanism, 12 ……
Back plate, 13 …… Screw hole, 14 …… Nut, 15 …… Through hole, 16
A ・ 16B …… Color, 17 …… Cylindrical guide part, 18 …… Flange, 19 …… Operation line, 20 …… Reinforcing bar, 21 …… Concrete layer, 22 …… Steel material, 23 …… Upper concrete layer, 24 ......
Stopper, S ... Narrow space, g ... Gap.

Claims (1)

(57) [Claims] 1. A reactor containment vessel in which a seismic shear lug mechanism (11) is provided between a steel wall (1) and a concrete biological shield wall (7), wherein a male type (3) and A through hole (1
5) and the screw hole (13) are formed, and the temporary bolt (5)
After mounting the collar (16A, 16B) that can be divided into temporary bolts with the screw attached to the screw hole, by fitting the through hole to the temporary bolt, the male type and female type are combined to use the temporary bolt. While fixing the opposite position of the male type and the female type by the fastening with the collar, the other of the male type and the female type is fixed to the steel wall in the standing state, and one of the male type and the female type is fixed. After fixing it with the concrete placing formwork (6) and the reinforcing bar (20), pull out the temporary bolt from the other of the male type and the female type to release the connected state, and change the collar to the male type and the female type. A method for constructing a reactor containment vessel, which comprises removing concrete from the mold and then placing concrete on the outside of the mold to construct a concrete biological shielding wall.