U.S. patent application number 10/196521 was filed with the patent office on 2003-02-06 for reactor building of steel concrete construction.
Invention is credited to Fujita, Tomohiro, Kanechika, Minoru, Nakamura, Kazuyuki, Odaka, Kiyotaka, Yamashita, Toshio, Yano, Tatsuo.
Application Number | 20030024176 10/196521 |
Document ID | / |
Family ID | 19057180 |
Filed Date | 2003-02-06 |
United States Patent
Application |
20030024176 |
Kind Code |
A1 |
Kanechika, Minoru ; et
al. |
February 6, 2003 |
Reactor building of steel concrete construction
Abstract
There is provided a reactor building of steel concrete
construction, which comprises a steel concrete containment vessel
constructed on the center of a footing slab and also composed of a
pair of relatively confronting steel plates and concrete placed in
a space between the steel plates. The reactor building is
constructed on the outer circumference of the same footing slab and
is also composed of a pair of relatively confronting steel plates
and concrete placed in a space between the steel plates. The
containment vessel is separated from partial slabs among a
plurality of slabs of the reactor building placed around the
containment vessel or all the slabs of the reactor building.
Inventors: |
Kanechika, Minoru;
(Minato-Ku, JP) ; Yano, Tatsuo; (Minato-Ku,
JP) ; Odaka, Kiyotaka; (Minato-Ku, JP) ;
Yamashita, Toshio; (Chiyoda-Ku, JP) ; Nakamura,
Kazuyuki; (Chiyoda-Ku, JP) ; Fujita, Tomohiro;
(Chiyoda-Ku, JP) |
Correspondence
Address: |
PEARNE & GORDON LLP
526 SUPERIOR AVENUE EAST
SUITE 1200
CLEVELAND
OH
44114-1484
US
|
Family ID: |
19057180 |
Appl. No.: |
10/196521 |
Filed: |
July 16, 2002 |
Current U.S.
Class: |
52/169.7 |
Current CPC
Class: |
Y02E 30/40 20130101;
E02D 27/32 20130101; Y02E 30/30 20130101; E02D 27/34 20130101; G21C
13/00 20130101 |
Class at
Publication: |
52/169.7 |
International
Class: |
E02D 027/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 25, 2001 |
JP |
2001-223930 |
Claims
What is claimed is:
1. A reactor building of steel concrete construction comprising a
steel concrete containment vessel constructed on the center of a
footing slab and also composed of a pair of relatively confronting
steel plates and concrete placed in a space between said steel
plates, wherein said reactor building is constructed on the outer
circumference of the same footing slab and is also composed of a
pair of relatively confronting steel plates and concrete placed in
a space between said steel plates; and said containment vessel is
separated from partial slabs among a plurality of slabs of the
reactor building placed around said containment vessel.
2. A reactor building of steel concrete construction according to
claim 1, wherein said containment vessel is separated from all the
slabs of the reactor building placed around said containment
vessel.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] This invention relates to a reactor building of steel
concrete construction with a steel concrete containment vessel.
[0003] 2. Description of the Related Art
[0004] As shown in FIG. 3, a reactor building of reinforced
concrete construction with a reinforced concrete containment vessel
in the related art is united with the containment vessel through
each slab placed around the containment vessel, so that there has
been provided a design to allow ring bars arranged in the slabs
placed around the containment vessel to bear circumferential
tensile stress (hoop tension), which is caused by temperature and
pressure load of the containment vessel.
[0005] In addition, there has been also provided a design to
distribute horizontal load during earthquake to an earthquake-proof
wall placed around the containment vessel and the containment
vessel itself according to the rigidities of the earthquake-proof
wall and the containment vessel by making use of the spring effects
of the slabs connected to the containment vessel.
[0006] A containment vessel and a reactor building which are of
steel concrete construction are realized merely by making a change
of the structural form from reinforced concrete construction to
steel concrete construction, and therefore are designed in a way
similar to that applied to the above reinforced concrete
construction. However, since each ring bar which bears the
circumferential tensile stress is arranged in a narrow space, which
is produced between an upper end bar within each slab placed around
the containment vessel and a reinforcing joist as well as stud
bolts mounted to a lower end steel plate, so as to extend in the
circumferential direction of the containment vessel, difficulty is
experienced in execution of works. In addition, when there is a
difference in level between the slabs placed around the containment
vessel, the ring bars produce a discontinuous portion, so that the
execution of work cost is increased with the need for additional
works to reinforce the discontinuous portion thus produced.
[0007] In addition, each slab bar needs to be anchored to the
containment vessel in order to unite the containment vessel with
the slabs placed around the containment vessel structurally. To
meet the above need, it is necessary to provide holes in an
external steel plate of the containment vessel so as to permit the
slab bars to pass through, so that additional works to increase the
thickness of a steel plate portion in the periphery of each hole
and so on are required to make up for chipped portions of
cross-section of holes, resulting in an increase in execution of
work cost also in respect of the need for the above additional
works.
[0008] Since the horizontal load during the earthquake is
distributed according to the rigidities of the earthquake-proof
wall of the building and the containment vessel itself, the
containment vessel sometimes takes a large percentage in bearing
seismic force depending on the balance of rigidities between the
whole building and each of the earthquake-proof wall and the
containment vessel. In such a case, it is necessary to generally
increase the thickness of the steel plate, so that an increase in
execution of work cost is also inevitable.
SUMMARY OF THE INVENTION
[0009] In view of the circumstances of the above related art, it is
an object of the present invention to provide a reactor building of
steel concrete construction, which takes the form enough to
eliminate the factors of the increase in execution of work
cost.
[0010] According to the present invention, in order to hold down
the increase in execution of work cost resulting from uniting a
reactor containment vessel with all slabs placed around the
containment vessel, there is provided a means of separating the
containment vessel from at least partial slabs among a plurality of
slabs of a reactor building placed around the containment vessel,
particularly from all the slabs as defined in claim 2.
[0011] Since the containment vessel is separated from at least the
partial slabs placed around the containment vessel, no transmission
of circumferential tensile stress from the containment vessel to
the slabs placed around the containment vessel occurs, so that
there is less or no need for ring bars in the slabs. In addition,
there is also less or no need for reinforcement on a discontinuous
portion, which is produced in the ring bars on the occasion for the
presence of a difference in level between the slabs.
[0012] In addition, since portions to anchor the slab bars to the
containment vessel are reduced or eliminated, there is also less or
no need for holes in the external steel plate of the containment
vessel, resulting in no need to increase the thickness of a steel
plate portion in the periphery of the holes for making up for the
chipped portions of cross-section of the holes.
[0013] Further, structural separation of the containment vessel
from the slabs of the building prevents the containment vessel from
taking a large percentage in bearing the seismic force on the
occasion for connecting the containment vessel to the building
through the slabs, according to the balance of rigidities between
the earthquake-proof wall of the building and the containment
vessel, resulting in also no need to generally increase the
thickness of the steel plate.
[0014] Separation of the containment vessel from the slabs placed
around the containment vessel causes the steel plate constituting
the containment vessel to bear the circumferential tensile stress.
While the containment vessel itself also bears the seismic force
input to the containment vessel, there is provided no additional
percentage in bearing the seismic force on the occasion for uniting
the containment vessel with all the slabs placed around the
containment vessel. Thus, no increase of the seismic force that the
containment vessel should bear occurs, so that the seismic force is
eventually reduced, leading to a reduction of the thickness of the
steel plate.
[0015] Since there is less or no need for the ring bars, as well as
less or no need to reinforce and thicken the external steel plate
of the containment vessel, works to finish the external steel plate
of the containment vessel as well as the slabs placed around the
containment vessel may be simplified, and the execution of work
cost for the containment vessel may be also reduced.
[0016] In addition, since there is less or no need for works to
scramble for construction of the containment vessel and the
building, the works for construction of the containment vessel and
the building may make progress independently of and in parallel
with each other. Thus, even if a difference in progress of the
stage of works between the containment vessel and the building
occurs in a portion to be scrambled for construction, there is
provided no delay of construction to the effect that it takes a
waiting time for the works to construct a portion where the stage
of works is relatively advanced, so that a substantially reduction
of the term of works may be realized.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The foregoing and other objects and features of the
invention will become apparent from the following description of
preferred embodiments of the invention with reference to the
accompanying drawings, in which:
[0018] FIG. 1 is a longitudinal sectional view showing a reactor
building of steel concrete construction according to the present
invention;
[0019] FIG. 2 is a schematic view showing the procedure of
execution of works of a reactor building; and
[0020] FIG. 3 is a longitudinal sectional view showing a reactor
building of steel concrete construction in the related art.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0021] According to the present invention, there is provided a
reactor building (which will be hereinafter simply referred to as a
building) 3 of steel concrete construction (which will be simply
referred to as SC construction). The building 3 has a steel
concrete containment vessel (SCCV) (which will be hereinafter
simply referred to as a containment vessel) 2 constructed on the
center of a footing slab 1, and is constructed on the outer
circumference of the same footing slab 1, as shown in FIG. 1. The
containment vessel 2 is that is separated from at least partial
slabs 3b among a plurality of slabs 3b of the building 3.
[0022] Since the containment vessel 2 is separated from at least
the partial slabs 3b of the building 3 placed around the
containment vessel 2, the works for construction of the containment
vessel 2 and the building 3 are executed independently of and in
parallel with each other. The construction of the containment
vessel 2 and the building 3 is divided into an executing section of
the containment vessel 2 and an executing section of the building 3
as viewed in plan in FIG. 2.
[0023] The footing slab 1, the containment vessel 2 and a frame
body of each part of the building 3 are built in the form of SC
construction, for instance, through the stage of installing a steel
plate unit or the like, which is formed by combining a pair of
confronting steel plates and a spacing member such as a steel plate
for holding the space between both the steel plates into a united
body of a size enough to be made hanging-down for installation, of
joining the adjacent steel plate units to each other and of
charging the space between the confronting steel plates with
concrete.
[0024] A description will now be given of the procedure of
constructing the building 3 including the containment vessel 2 with
reference to FIG. 2. The footing slab 1 is constructed through the
stage of installation of the steel plate unit 1a and of concrete
placing. More specifically, before regular joining of the steel
plates themselves and concrete placing are carried out in the stage
of completing installation of the steel plate unit 1a, the external
steel plate among the steel plates of the steel plate unit 1a is
utilized as a working floor for execution of works of installation
and joining or the like of the steel plate units constituting the
first layer of the containment vessel 2 on the center of the
footing slab 1 and also the frame body of the building 3, such as a
SC wall, a SC column, a SC beam and a SC floor, on the outer
circumference of the footing slab.
[0025] Since transition to the works for construction of the frame
body of the building 3 may be made after installation of the steel
plate unit 1a of the footing slab 1, concrete placing in the
footing slab 1 is supposed to be not critical so far as transition
to the works for construction of an upper portion is concerned.
[0026] In addition, use of vertical ribs and anchor bolts or the
like preliminarily incorporated in the steel plates on the footing
slab 1 at prospective positions of the containment vessel 2 and the
wall and the column of the lowest story of the building 3, at need,
makes it possible to support vertical loads (the own weight) of the
steel plate units of the containment vessel 2, the SC wall and the
SC column or the like and also to ensure the installing accuracy
when the steel plate units are installed in position.
[0027] In particular, as shown in FIG. 2, the execution of works to
hang down the steel plate units for installation on the building
site after having built up the steel plate units out of the
building site as a SCCV module 2a, which is formed in the shape
resulting from dividing the containment vessel 2 into a plurality
of blocks in elevation, and a SC wall module 3a and a SC floor
module, which are formed in the shape resulting from dividing the
steel plate or the like constituting the frame body equivalent to
one story portion of the building 3 into a plurality of blocks in
plan, may reduce the number of stages of joining works on the
building site as compared with the case of joining the steel plates
one by one on the building site, so that the reduction of the term
of works may be realized, and besides, the building-up accuracy may
be also improved.
[0028] Further, the execution of works to hang down the steel plate
units for installation on the building site after having built up
the steel plate units out of the building site as a monolithic
module, which is formed by building up the equipment, the piping
and an equipment operation frame out of the building site, or the
SC wall module 3a and the SC floor module as described the above,
or a monolithic SC wall-floor module, which is formed by uniting
the SC wall module and the SC floor module together, and a
monolithic composite module, which is formed by combining the above
modules with an equipment-piping module, may also reduce the need
for works to scramble for installation of the equipment and
construction of the building on the building site, so that the
extreme reduction of the loss on the stage of works depending on
complication of installation of the equipment and construction of
the building may be realized, and besides, the building-up accuracy
may be also further improved.
[0029] The SCCV module 2a (the first layer of the containment
vessel 2) and the monolithic SC wall-floor module or the like are
installed on the footing slab 1 and concrete placing is carried out
in the footing slab 1. Subsequently, concrete placing is further
carried out in the first layer of the containment vessel 2 on the
center of the footing slab 1, before hanging-down of the SCCV
module 2a of the second layer of the containment vessel for
installation in position.
[0030] In parallel to installation of the SCCV module 2a of the
second layer of the containment vessel 2, the SC wall module 3a is
installed on the outer circumference of the footing slab, while the
equipment-piping module is also installed in position.
Subsequently, the SC floor module is installed in position before
concrete placing in the wall and the floor. Alternatively, the SC
wall module 3a and the SC floor module or the monolithic SC
wall-floor module and the monolithic composite module may be also
installed in position before concrete placing in the wall and the
floor.
[0031] The above works for construction on the center and the outer
circumference of the footing slab 1 may be executed repeatedly so
as to forward construction in sequence from the lower story toward
the upper story, so that the term of works for construction of the
reactor building 3 of steel concrete construction with the steel
concrete containment vessel 2 may be reduced substantially.
[0032] In particular, as shown in FIG. 2, structural separation of
the containment vessel 2 placed in the center from at least the
partial slabs 3b among a plurality of slabs 3b of the building 3
placed around the containment vessel may eliminate or reduce the
need for works to scramble for construction on the center and the
outer circumference of the footing slab, so that the works for
construction on the center and the outer circumference of the
footing slab may make progress almost completely independently of
each other, permitting the further reduction of the loss on the
stage of works in plan. In the drawing, there is shown a case where
some of the slabs 3a are connected to the containment vessel 2.
However, all the slabs 3a may be also separated from the
containment vessel 2 at need.
[0033] FIG. 3 shows the relation between the containment vessel and
the building which are of reinforced concrete or steel concrete
construction. In FIG. 3, the slab of each story of the building is
connected to the containment vessel to unite the containment vessel
with the building, a difference in relative progress of the stage
of works between the containment vessel and the building easily
occurs in a portion to be scrambled for construction. Thus, in any
story where the above difference occurred, it takes a waiting time
for the works to construct a portion where the stage of works is
advanced, resulting in a loss on the term of works in the whole
stage of works.
[0034] On the other hand, according to the present invention, the
containment vessel 2 is separated from the slabs 3b of the building
2, other than the slabs 3b connected to the containment vessel 2,
as shown in FIG. 1. Thus, in the slabs other than the connected
slabs 3b, the need for the works to scramble for construction of
the containment vessel 2 and the building 3 may be eliminated to
realize the execution of works to construct the containment vessel
2 and the building 3 independently of each other, so that it does
not take any waiting time which is caused by the difference in the
stage of works in the portion to be scrambled for construction,
thereby eliminating the loss on the stage of works. The reactor
building and the containment vessel shown in FIGS. 1 and 3 are of
advanced boiling water reactor (ABWR) type.
[0035] The reactor building of steel concrete construction with the
steel concrete containment vessel according to the present
invention as described the above has the following effects.
[0036] Since the containment vessel is separated from at least the
partial slabs 3b among a plurality of slabs of the reactor
building, no transmission of circumferential tensile stress from
the containment vessel to the slabs placed around the containment
vessel occurs, so that there is less or no need for ring bars,
which have been required for transmission of the stress. In
addition, there is also less or no need for reinforcement on the
discontinuous portion, which has been produced in the ring bars on
the occasion for the presence of the difference in level between
the slabs.
[0037] In addition, since the portions to anchor the slab bars to
the containment vessel may be reduced or eliminated, there is also
less or no need for holes in the external steel plate of the
containment vessel, resulting in no need to increase the thickness
of the steel plate portion in the proximity of the holes for making
up for the chipped portions of cross-section of the holes.
[0038] Further, the containment vessel may be prevented from taking
a large percentage in bearing the seismic force on the occasion for
connecting the containment vessel to the building through the slabs
of the building, according to the balance of rigidities between the
earthquake-proof wall of the building and the containment vessel,
resulting in also no need to generally increase the thickness of
the steel plate.
[0039] While the containment vessel itself bears the seismic force
input to the containment vessel, there is provided no additional
percentage of bearing the seismic force on the occasion for uniting
the containment vessel with the whole slabs placed around the
containment vessel. Thus, no increase of the seismic force that the
containment vessel should bear occurs, so that the seismic force is
eventually reduced, thus leading to a reduction of the thickness of
the steel plate.
[0040] Since there is less or no need of ring bars, as well as less
or no need to reinforce and thicken the external steel plate of the
containment vessel, the works to finish the external steel plate of
the containment vessel as well as the slabs placed around the
containment vessel may be simplified, while the execution of work
cost for the containment vessel may be also reduced.
[0041] In addition, there is also less or no need for the works to
scramble for construction of the containment vessel and the
building, the works for construction of the containment vessel and
the building may make progress independently of and in parallel to
each other, and any delay of the works for construction of a
portion to be scrambled for construction may be eliminated, so that
the substantial reduction of the term of works may be realized.
[0042] According to claim 2, since the containment vessel is
separated from all the slabs, it may be highly effective in
realizing a smaller execution of work cost as well as a shorter
term of works.
* * * * *