JPH0659071A - Construction engineering for atomic power station building - Google Patents

Abstract

PURPOSE:To provide construction engineering of an atomic power station building capable of recycling resources by efficiently utilizing concrete waste materials as a construction material of a new power station. CONSTITUTION:By renewing concrete of extreme low level radio-activity produced in large quantities at the time of demolition of an old atomic plant building into coarse aggregate and fine aggregate, and with concrete of the coarse aggregate and the fine aggregate as its aggregate, a man-made rock 1, a building mat 2, an earthquakeproof wall 3, a shell wall 4, a partition wall 5, a floor slab 6, a column and others of an atomic power plant building newly constructed in the same site are constituted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a nuclear power plant building by reusing concrete having a very low level of radioactivity, which is produced in large quantities when an old nuclear power plant building is dismantled.

[0002]

2. Description of the Related Art Generally, a nuclear power plant is designed to have a useful life of 40 to 50 years. In Japan, in order to make effective use of the site and equipment, after the dismantling and removal of the nuclear power plant, Has a policy of constructing a new nuclear power plant. In this case, disposal of a large amount of dismantled waste materials generated by dismantling the old power plant has become a problem.

Currently, researches on decommissioning of nuclear power plants are being carried out by the government and electric power companies, but most of the waste generated by the dismantling work does not need to be treated as radioactive waste. It is a very low level waste of Noh, and most of it is concrete waste.

This method of disposing or reusing concrete waste is a major research subject as a factor that greatly affects the cost of decommissioning.

[0005] Further, the Ministry of Construction and others have conducted research on the recycling treatment of concrete, and a method of recovering concrete aggregate and reusing it as new aggregate for concrete is also under study.

[0006]

However, in the conventional technical development of reusing concrete, it was intended to use the aggregate recovered from the old concrete as the aggregate for new concrete. Since it is difficult to obtain an aggregate of good quality due to the influence of the mortar content adhering to the surface of the material, the strength of the recycled concrete is reduced, and variation in quality is unavoidable.

For concrete waste generated from a nuclear power plant, how to set a value to be treated as general waste according to the radioactivity level has become a big problem. It is said that there are many technical and institutional issues that need to be resolved before disposal.

The present invention has been made in order to solve the above problems, and it is possible to effectively utilize concrete waste material as a construction material for a new power plant and to recycle resources. The purpose is to provide a construction method of.

[0009]

A method for constructing a nuclear power plant building according to claim 1 of the present invention is to construct a concrete with a very low level of radioactivity, which is produced in a large amount when an old nuclear power plant building is dismantled. Remanufactured into coarse aggregate and fine aggregate, and using concrete with the coarse aggregate and fine aggregate as the aggregate, a manmade lock, building mat, and earthquake resistance of a nuclear power plant building newly constructed on the same site It constitutes walls, partition walls, floor slabs, columns, and the like.

According to the second aspect of the present invention, the method for constructing a nuclear power plant building is a method of regenerating crushed recycled aggregate of extremely low level radioactive concrete that is produced in large quantities when an old nuclear power plant building is dismantled. However, by using prepacked concrete with the crushed recycled aggregate as aggregate, manmade locks, building mats, earthquake-resistant walls, partition walls, floor slabs, columns, etc. of a nuclear power plant building newly constructed on the same site It is what constitutes.

According to a third aspect of the present invention, there is provided a method for constructing a nuclear power plant building, wherein a concrete block having a predetermined size is made of concrete having a very low level of radioactivity, which is produced in a large amount when the old nuclear power plant building is demolished. The premanufactured concrete that has been regenerated into the above-mentioned demolition concrete block as an aggregate constitutes a manmade lock, an earthquake-resistant wall, a partition wall, and the like of a nuclear power plant building that is newly constructed on the same site.

[0012]

【Example】

Example 1. 1 to 7 show an embodiment of a nuclear power plant building construction method according to the present invention. FIG. 1 is a vertical sectional view of a nuclear power plant building (hereinafter, simply referred to as a building), and FIG. 3 to 7 are cross-sectional views showing the structure of each part of the building.

In the figure, reference numeral 1 is a manmade rock (artificial rock) for backfilling the surroundings of the building, 2 is a building mat, 3 is an earthquake resistant wall, 4 is a shell wall covering the reactor, 5 is a partition wall, and 6 is a floor slab. , And 7 is a pillar.

The manmade lock 1 is constructed by placing concrete 8 (hereinafter simply referred to as concrete 8) using recycled aggregate (see FIG. 3).

Recycled aggregate is a large amount of concrete that has a very low level of radioactivity, which is generated when the old building is dismantled, and is regenerated into coarse aggregate and fine aggregate within the site. In addition, it may be regenerated into an aggregate having the same diameter as that of the fine aggregate, and the material strength may be equal to or less than the ordinary aggregate.

In the building mat 2, concrete 8 is placed in a steel plate form made of a back surface steel plate 9 and a front steel plate 10, and the gap between the concrete 8 and the front steel plate 10 is completely filled on the concrete 8. It is configured by filling grout material 11 such as mortar by a press-fitting method (see FIG. 4).

Further, a plurality of studs 12 are provided on the inner side of the back surface steel plate 9 and the front steel plate 10 in order to achieve complete integration with the concrete 8 and the grout material 11, and
If necessary, a waterproof layer 13 is formed on the outer side of the back surface steel plate 9 to prevent the back surface steel plate 9 from being corroded.

Seismic wall 3, shell wall 4 and partition wall 5
Is constructed by placing concrete 8 in a steel plate form made up of a back surface steel plate 9 and a front steel plate 10 by a press-fitting method (see FIG. 5).

Further, as in the case of the building mat 2, a plurality of studs 12 are provided on the inside of the back surface steel plate 9 and the front surface steel plate 10 so as to be integrated with the concrete 8, and the back surface steel plate 9 is further provided. The surface steel plate 10 and the surface steel plate 10 are connected to each other by a plurality of shear bars 14 made of a shape member or the like in order to prevent entrainment or the like due to lateral pressure or vibration during concrete pouring.

The floor slab 6 is constructed by arranging a plurality of reinforcing rebars 15 in a grid pattern on a steel plate form made of a backside steel plate 9 and by placing concrete 8 to a predetermined thickness. (See Figure 6).

Further, a plurality of studs 12 are provided on the inner side of the back surface steel plate 9 for the purpose of integrating with the concrete 8. Further, in the concrete 8, the thickness of the floor slab 6 is kept constant. At the same time, in order to make the span of the floor slab 6 as large as possible, a receiving beam 16 made of T-shaped steel or the like is installed. The receiving beam 16 is integrated with the back surface steel plate 9 by welding to the back surface steel plate 9.

The pillar 7 is constructed by placing concrete 8 in a steel plate form 17 having a rectangular shape (see FIG. 7).

A plurality of studs 12 are provided on the inside of the steel plate form 17 so as to be integrated with the concrete 8, and the opposite flanges 17a, 17a of the steel plate form 17 are provided at the time of placing concrete. They are connected by a plurality of shear bars 14 so as not to get caught by the lateral pressure, vibration, and the like. The beam (not shown) also has a structure similar to that of the pillar 7.

Example 2. 8 to 12 show an embodiment of the nuclear building construction method according to the second aspect of the present invention, and each is a sectional view showing the structure of each part of the building.

The manmade lock 1 is constructed by placing prepacked concrete 18 (hereinafter simply referred to as prepacked concrete) using crushed recycled aggregate (see FIG. 8).

The crushed recycled aggregate is a concrete mass having a very low level of radioactivity, which is produced in large quantities when the old building is dismantled, and is recycled into a concrete block having a maximum particle size of about 40 cm.

The building mat 2 has a steel plate form made of a back surface steel plate 9 and a front steel plate 10 and a partition wall 19 made of a steel plate or an angle material.
The pre-packed concrete 18 is placed in each of the divided spaces, and the grouting material 11 such as mortar is filled on the pre-packed concrete 18 to fill the gap with the surface steel plate 10. Is filled by a press-fitting method (see FIG. 9).

A plurality of ribs 20 are provided on the inner side of the back surface steel plate 8 for the purpose of integration with the prepacked concrete 18.
And a plurality of studs 12 are projected inside the surface steel plate 10 for the purpose of integrating with the grout material 11.

The rib 20 is formed by welding a shaped steel or the like to the inner side of the back surface steel plate 8 in order to prevent the crushed recycled aggregate from being deformed by an impact or the like when dropped and to improve the catch of the crushed recycled aggregate. It is formed by. Other configurations are
The structure is substantially the same as that of the building mat 2 of the first embodiment.

The earthquake-resistant wall 3, the shell wall 4 and the partition wall 5
In the same manner as the building mat 2, the steel plate form made up of the back surface steel plate 9 and the front steel plate 10 is divided into a plurality of space parts by the partition walls 19 made of a steel plate, an angle material, and the like, and each of the divided space parts is prepacked. It is constructed by placing concrete 18 (see Fig. 10).

Further, as in the case of the building mat 2, a plurality of ribs 20 are provided on the inside of the back surface steel plate 9 and the front surface steel plate 10 so as to be integrated with the prepacked concrete 18.

In the floor slab 6, prepacked concrete 18 is cast on a steel plate form made of a backside steel plate 9, and a plurality of reinforcing reinforcing bars 15 are arranged in a grid on the upper side of the prepacked concrete 18, and , The concrete 8 is cast (see FIG. 11).

A plurality of ribs are provided on the inner side of the back surface steel plate 9 for the purpose of integration with the prepacked concrete 18.
20 are projected, and the floor slab 6 is kept in the pre-packed concrete 18 while keeping the thickness of the floor slab 6 constant.
A receiving beam 16 made of T-shaped steel is erected so that the span can be maximized. Receiving beam 16 is backside steel plate
It is integrated with the back surface steel plate 9 by welding.

The pillar 7 is constructed by placing prepacked concrete 18 in a steel plate form 17 having a rectangular shape (see FIG. 12).

A plurality of ribs 20 are provided on the inner side of the steel plate form 17 so as to be integrated with the pre-packed concrete 18, and the flanges 17a, 17a of the steel plate form 17 facing each other are provided.
Are connected by a plurality of shear bars 14 so as not to get caught by lateral pressure, vibration, etc. at the time of placing concrete. The beam (not shown) also has a structure similar to that of the pillar 7.

Example 3. 13 and 14 show an embodiment of the nuclear power plant building construction method according to claim 3 of the present invention, and each is a cross-sectional view showing the structure of each part of the building.

The manmade lock 1 is constructed by placing pre-packed concrete using demolition concrete blocks (see FIG. 13).

The demolished concrete block is a concrete block with a very low level of radioactivity, which is produced in large quantities when the old building is demolished, and is reclaimed into blocks with a maximum length and width of 1 m square. Reinforcing bars are embedded in the concrete. You can leave it alone.

Seismic wall 3, shell wall 4 and partition wall 5
Is a plurality of steel concrete blocks 21 (hereinafter,
It is constructed by stacking (referred to as SC blocks) welding together (see Fig. 14).

The SC block 21 is constructed by placing a prepacked concrete 23 using a dismantled concrete block in a steel box 22 having a predetermined size made of a steel plate, and the adjacent SC block 21 and The joint portion with 21 is filled with grout material 24 in order to prevent leakage of radioactivity.

A rib 20 is provided on the inside of the steel box 22 so as to be integrated with the prepacked concrete 23.

[0042]

The present invention is configured as described above, and according to the nuclear power plant building construction method described in claims 1, 2, and 3, the demolition waste of the former nuclear power plant can be obtained. Since most of the concrete is reused as aggregate for constructing manmade locks, building mats, earthquake-resistant walls, etc. of a new nuclear power plant building constructed on the same site, If it is sealed with a steel plate as shown in, there is no fear of radioactive contamination to others, and the technical and institutional problems related to radioactive contamination can be solved.

By recycling concrete waste materials,
It also has the effect of solving the problem of processing concrete waste and enabling effective use of resources.

According to the nuclear power plant building construction method described in claims 2 and 3, a large amount of crushed recycled aggregate and dismantled concrete blocks are generated when the old building is dismantled.
Since concrete with extremely low levels of radioactivity can be regenerated by simply crushing or cutting it into a predetermined size, it has the effect of being extremely easy to regenerate and extremely economical.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a nuclear power plant building showing an embodiment of a nuclear power plant building construction method according to the present invention.

2 is a cross-sectional view of the nuclear power plant building shown in FIG. 1. FIG.

FIG. 3 is a sectional view of a manmade lock.

FIG. 4 is a sectional view of a building mat.

FIG. 5 is a cross-sectional view of an earthquake resistant wall, a partition wall and a shell wall.

FIG. 6 is a sectional view of a floor slab.

FIG. 7 is a cross-sectional view of columns and beams.

FIG. 8 is a sectional view of a manmade lock of a nuclear building showing an embodiment of the nuclear building construction method according to claim 2 of the present invention.

FIG. 9 is a sectional view of a building mat of a nuclear building showing an embodiment of the nuclear building construction method according to claim 2 of the present invention.

FIG. 10 is a cross-sectional view of an earthquake resistant wall, a partition wall and a shell wall of a nuclear building showing an embodiment of the nuclear building construction method according to claim 2 of the present invention.

FIG. 11 is a sectional view of a floor slab of a nuclear building showing an embodiment of the nuclear building construction method according to claim 2 of the present invention.

FIG. 12 is a sectional view of a pillar and a beam of a nuclear power building showing an embodiment of the nuclear power building construction method according to the second aspect of the present invention.

FIG. 13 is a sectional view of a manmade lock of a nuclear building showing an embodiment of the nuclear building construction method according to the third aspect of the present invention.

FIG. 14 is a sectional view of an earthquake resistant wall, a partition wall and a shell wall of a nuclear building showing an embodiment of the nuclear building construction method according to claim 3 of the present invention.

[Explanation of symbols]

1 ... Manmade rock (artificial rock), 2 ... Building mat, 3
... Earthquake-resistant wall, 4 ... Shell wall, 5 ... Partition wall, 6 ... Floor slab, 7 ... Column, 8 ... Concrete using recycled aggregate, 9 ... Backside steel plate, 10 ... Surface steel plate, 11 ... Grout material , 12 ... Studs, 13 ... Waterproof layer, 14 ... Shear bar, 15
… Reinforced reinforcing bars, 16… Receiving beams, 17… Steel plate formwork, 18… Prepacked concrete using crushed recycled aggregate (prepacked concrete), 19… Bulkheads, 20… Ribs, 21… Steel concrete blocks (SC blocks) , 22… Steel box, 23
… Prepacked concrete using dismantled concrete blocks (prepacked concrete), 24… Grout materials.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuyuki Niwa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd.

Claims (3)

[Claims] 1. A concrete having a very low level of radioactivity, which is produced in large quantities at the time of dismantling an old nuclear power plant building, is regenerated into coarse aggregate and fine aggregate, and the coarse aggregate and fine aggregate are used as aggregate. Nuclear power plant characterized by constructing manmade locks, building mats, earthquake-resistant walls, partition walls, shell walls, floor slabs, columns, etc. of a new nuclear power plant building constructed on the same site with concrete Building construction method. 2. The same level of prepacked concrete in which a concrete with a very low level of radioactivity, which is generated in a large amount at the time of dismantling an old nuclear power plant building, is regenerated into a crushed recycled aggregate and the crushed recycled aggregate is used as an aggregate. Manmade rock, building mat of the nuclear power plant building that will be newly built on the premises,
A construction method for a nuclear power plant building characterized by constructing earthquake resistant walls, partition walls, shell walls, floor slabs, columns, etc. 3. A pre-packed concrete having an extremely low level of radioactivity, which is produced in large quantities at the time of dismantling an old nuclear power plant building, is regenerated into a dismantled concrete block of a predetermined size, and the dismantled concrete block is an aggregate. A construction method for a nuclear power plant building, which is characterized by constructing manmade locks, earthquake-resistant walls, partition walls, etc. of a newly built nuclear power plant building on the same site.