CN112609832B - Nuclear power station nuclear island double-shell dome arch membrane forming construction method and construction jig frame - Google Patents

Nuclear power station nuclear island double-shell dome arch membrane forming construction method and construction jig frame Download PDF

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Publication number
CN112609832B
CN112609832B CN202011395227.2A CN202011395227A CN112609832B CN 112609832 B CN112609832 B CN 112609832B CN 202011395227 A CN202011395227 A CN 202011395227A CN 112609832 B CN112609832 B CN 112609832B
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dome
frame
platform
jig frame
annular
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CN112609832A (en
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汤志孟
曾庆威
代通华
乔军辉
周玉东
刘志强
衣晓垒
张国斌
姚崇磊
汪虎
谭喜
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China Nuclear Industry 24 Construction Co Ltd
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China Nuclear Industry 24 Construction Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/32—Arched structures; Vaulted structures; Folded structures
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B7/00—Roofs; Roof construction with regard to insulation
    • E04B7/08—Vaulted roofs
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/14—Conveying or assembling building elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/14—Conveying or assembling building elements
    • E04G21/16—Tools or apparatus
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/32—Arched structures; Vaulted structures; Folded structures
    • E04B2001/3217—Auxiliary supporting devices used during erection of the arched structures

Abstract

The invention discloses a nuclear power station nuclear island double-shell dome arch membrane forming construction method and a construction jig frame, wherein the method comprises the following steps: according to the structural characteristics of the dome, dividing the dome into a plurality of annular layers and a plurality of sub-modules according to the requirements of hoisting, transportation and the like; designing, manufacturing and assembling an arch membrane structure jig; assembling an inner side operation platform and a measuring platform; assembling a dome and hanging an outer operating platform; the structure of the arch membrane structure jig frame is changed, and the items are installed and coated. The invention changes the traditional process and solves the current situation that the measurement/welding/detection space is insufficient when the existing dome is assembled with a full scaffold, the assembling/mounting/painting process is switched to repeatedly assemble and disassemble the scaffold; the working environment is improved, the construction process is optimized, and the construction efficiency and safety are improved.

Description

Nuclear power station nuclear island double-shell dome arch membrane forming construction method and construction jig frame
Technical Field
The invention belongs to the technical field of construction of nuclear power plant steel structure engineering, and particularly relates to a nuclear power plant nuclear island double-shell dome arched film forming construction method and a construction jig frame.
Background
Zhangzhou nuclear power station is the standardized hualong No. one heap type after ACP1000, HPR1000 fuse at present, and its nuclear island design is double-shelled structure, and interior dome is connected with nuclear island inner shell steel lining barrel, and outer dome is connected with nuclear island shell shielding wall. In the prior art, all domes with steel lining type similar structures adopt full framing scaffolds as dome assembling jig frames, and the scaffold frames are repeatedly assembled and disassembled in the processes of assembling, coating and installing and constructing items inside the domes.
The existing nuclear power dome assembling structure and method are shown in patents CN201310163894 AP1000 nuclear power dome assembling jig frame and CN 201110451846-transportation tool bracket of nuclear power containment vessel head assembling machine. CN201310163894 AP1000 Nuclear electric dome assembling jig provides a dome assembling construction method of a structure with a framework at the inner side and a panel at the outer side, and is not applicable to assembling of a spherical dome with the framework at the outer side and the panel at the inner side; CN 201110451846-nuclear power containment head erector transportation frock support provides a construction method for splicing a thick plate head, and is not suitable for a lining type dome structure with a thin wall and a large volume.
Disclosure of Invention
Aiming at the technical problems, the invention provides a nuclear island double-shell dome arched film forming construction method and a construction jig frame for solving the problems.
The invention is realized by the following technical scheme:
a nuclear power station nuclear island double-shell dome arched film forming construction method comprises the following steps:
s1, dividing a dome into a plurality of annular layers, wherein each annular layer is divided into a plurality of sub-modules along the longitudinal direction;
s2, installing an arch membrane jig frame:
s2-1, arranging dome buttresses according to the dome profile diameter and the dome sub-module assembling longitudinal welding seam position; the tire frame buttresses are uniformly distributed according to the stress condition of the dome, the distribution profiles of all the tire frame buttresses are in the distribution profiles of the dome buttresses, and the tire frame buttresses are also arranged at the central parts of the distribution profiles of all the tire frame buttresses;
s2-2, mounting a lower corner pivot on each jig frame buttress at the arrangement contour position; a center barrel frame is arranged on the moulding bed buttress in the center of the outline; the bottom of the central cylinder frame is fixed on a jig frame buttress, and a plurality of upper corner supporting points are arranged at the upper part of the central cylinder frame along the annular direction;
s2-3, installing beam string beams, wherein two ends of each beam string beam are respectively connected with free ends of a lower corner fulcrum and an upper corner fulcrum;
s2-4, synchronously assembling a plurality of vertical face arch film jig frame bodies, and connecting the vertical face arch film jig frame bodies through secondary beams to form a spherical arch film jig frame;
s2-5, according to the operation space requirement, installing an upper inner side platform on the lower corner fulcrum, the beam string and the upper corner fulcrum in sequence along the longitudinal direction;
s3, hanging each dome sub-module to a corresponding dome buttress to form an annular layer section, and connecting the outer annular platform to form a whole; the dome submodule is pre-provided with an outer annular platform and an outer longitudinal platform;
s4, completing the connection and forming of the first annular layer section of the dome through the inner side platform and the outer side longitudinal platform; the size measurement control of the dome forming process is completed by installing a measuring platform on the central cylinder frame;
s5, finishing the second annular layer section of the dome backwards according to the procedures of S3 and S4, and additionally finishing the connection between the annular layer sections of the dome through an inner side platform and an outer side annular platform;
s6, controlling the integral height of the arch film jig frame by adjusting the top elevation of the central cylinder frame, and being suitable for forming domes with different radians; the radius of the arch film jig frame is controlled by adjusting the radial distance of the lower corner fulcrum, so that the arch film jig frame is suitable for forming domes with different spans;
s7, vertically transporting the large component through a central channel of the central barrel frame; transporting the small component through the inboard platform; the dome inner items are assembled and installed through the outer annular platform and the central barrel frame;
s8, reflecting and projecting the measured positioning points to the ground of a dome assembly field through the dome center reference point, and improving the rapid measurement positioning and checking of subsequent installation items;
s9, finishing the procedures including the installation and coating of the items by adjusting the platform according to the steps S6-S8;
the dome is a spherical or ellipsoidal dome.
According to the invention, the structural characteristics of the inner dome and the outer dome are effectively combined, and the arch membrane type forming jig frame is designed on the inner side of the dome to form a dome assembled support body; the dome adopts the layering to assemble, forms body structural rigidity with ground strong point, and the lower floor is as the upper strata and assembles the supporter. The dome is assembled and molded and the items inside the dome are installed by designing an operating platform on an inner dome film structure, designing an operating platform on an outer dome framework and designing a vertical transportation channel and a measuring platform on an inner center barrel frame. The invention changes the traditional process and solves the current situation that the measurement/welding/detection space is insufficient when the existing dome is assembled with a full scaffold, the assembling/mounting/painting process is switched to repeatedly assemble and disassemble the scaffold; the working environment is improved, the construction process is optimized, and the construction efficiency and safety are improved.
Further preferably, the method for adjusting the arch membrane jig in step S6 includes the following steps:
s6-1, removing the connection between the beam string and the pivot of the upper corner, and putting the beam string down on the bracket beam;
s6-2, adjusting the installation elevation of the central barrel frame;
s6-3, lifting the beam string, connecting with the pivot of the upper corner;
preferably, the bracket beam is annularly arranged on the central barrel frame close to the bottom barrel body; in S6-1, the connection between the beam string and the pivot of the upper corner is released, and the beam string is lowered onto the bracket beam.
Further preferably, all the inner side platforms are distributed in a stair structure along the longitudinal direction.
Further preferably, all the outer annular platforms are distributed along the longitudinal direction to form a stair structure, and the outer annular platforms are positioned at the joint of the adjacent annular layers of the dome.
Further preferably, the outer longitudinal platforms are located at the junctions of corresponding dome adjacent sub-modules.
Further preferably, in step S2-1, all dome buttresses are arranged in a circular ring I; the jig frame buttresses are uniformly distributed according to the stress condition of the dome, all the jig frame buttresses are distributed in a circular ring II, and the jig frame buttresses are also distributed in the center of the circular ring II; the circular ring II is positioned in the circular ring I, and the circular ring II and the circular ring I are concentrically arranged.
A nuclear power station nuclear island double-shell dome arched film forming construction jig frame is used in the nuclear power station nuclear island double-shell dome arched film forming construction method and is characterized by comprising a central cylinder frame, a plurality of jig frame buttresses, lower corner supporting points, beam string and upper corner supporting points; the jig frame buttresses are used for being distributed in an annular profile, and the outer diameter of the annular profile is smaller than the diameter of the dome; a jig frame buttress is also arranged at the geometric center part of the annular outline; each jig frame buttress at the annular outline position is provided with a lower corner fulcrum; a central barrel frame is arranged on a jig frame buttress in the center of the annular outline; the bottom of the central cylinder frame is fixed on a jig frame buttress, and a plurality of upper corner supporting points are arranged at the upper part of the central cylinder frame along the annular direction; two ends of each beam string are respectively connected with free ends of the lower corner supporting point and the upper corner supporting point.
The arched film jig frame is characterized in that a main framework structure is formed by the lower corner supporting point, the beam string, the lower corner supporting point and the central cylinder frame, a lower corner supporting point, a beam string and an upper corner supporting point are preferably designed to form a group of longitudinal keels, the longitudinal keels are sequentially arranged along the ring shape to form the spherical arched film jig frame, the bottom end of each group of longitudinal keels is installed on the jig frame supporting pier, and the top end of each group of longitudinal keels is installed on the central cylinder frame. The lower corner fulcrum and the beam string can be in hinged connection (for example, hinged connection of a fixed corner is realized through a pin shaft) or in a detachable connection structure (for example, bolt detachable connection), and the upper corner fulcrum and the beam string can be detachably connected (for example, bolt detachable connection). For the height adjustment of the central barrel frame, the height adjustment can be realized by replacing prefabricated central barrel frames with different heights or designing the central barrel frame to be a telescopic barrel frame structure (such as a shear fork lifting platform) in the vertical direction.
Further preferably, the bracket device further comprises a bracket beam, and the bracket beam is annularly arranged on the central barrel frame close to the bottom barrel body.
Further preferably, the device also comprises a plurality of inner side platforms, outer side longitudinal platforms and outer side circumferential platforms; an upper inner side platform is sequentially arranged on the lower corner supporting point, the beam string and the upper corner supporting point along the longitudinal direction; the outer longitudinal platform and the outer circumferential platform are used for being mounted on the dome body. The inboard platform, the outboard longitudinal platform, and the outboard circumferential platform may be of various plate configurations that match the field installation environment.
The invention has the following advantages and beneficial effects:
according to the invention, the structural characteristics of the inner dome and the outer dome are effectively combined, and an arch film type molding jig frame is designed on the inner side of the dome to form a dome assembled support body; the dome adopts the layering to assemble, forms body structural rigidity with ground strong point, and the lower floor is as the upper strata and assembles the supporter. The dome is assembled and molded and the items inside the dome are installed by designing an operating platform on an inner dome film structure, designing an operating platform on an outer dome framework and designing a vertical transportation channel and a measuring platform on an inner center barrel frame.
The invention provides a spherical arch membrane forming jig frame with a simple structure and an assembling method of an inner dome and an outer dome, optimizes a double-shell dome assembling construction platform and a measuring and detecting space, realizes jig frame integration, improves the operation environment, and improves the work efficiency and the construction safety.
The invention changes the traditional process and solves the current situation that the measurement/welding/detection space is insufficient when the existing dome is assembled with a full scaffold, the assembling/mounting/painting process is switched to repeatedly assemble and disassemble the scaffold; the working environment is improved, the construction process is optimized, and the construction efficiency and safety are improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is an elevation view of the dome arch film forming construction principle of the present invention;
fig. 2 is a plan view, 1/4 view, of the dome film forming construction principle of the present invention.
Reference numbers and corresponding part names in the drawings: 1-dome buttress, 2-jig buttress, 3-inner platform, 4-lower corner pivot, 5-dome body, 6-beam string, 7-outer annular platform, 8-upper corner pivot, 9-central barrel frame, 10-bracket beam, 11-outer longitudinal platform, A-dome annular layered and outer annular platform, and B-dome longitudinal layered and outer longitudinal platform.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The embodiment provides a nuclear island double-shell dome arched film forming construction method for a nuclear power station, as shown in fig. 1 and 2, the specific steps are as follows:
s1, according to different structural characteristics of the double-shell dome, combining with the actual situation of field transportation, determining that the dome is layered and partitioned into a plurality of annular layers, each annular layer is divided into a plurality of dome sub-modules along the longitudinal direction, planning the molding of the dome sub-modules to a factory, and planning the assembling and molding of the dome integral modules to an engineering field;
each dome submodule consists of a panel and a framework, wherein the panel is placed on the jig frame after being rolled by the double curved surfaces and is assembled and molded with the framework.
S2, installing an arch membrane jig:
s2-1, arranging a dome buttress 1 according to the dome profile diameter and the dome sub-module assembling longitudinal welding seam position; the jig frame buttresses 2 are uniformly distributed according to the stress condition of the dome, the distribution profiles of all the jig frame buttresses 2 are in the distribution profile of the dome buttresses 1, and the jig frame buttresses 2 are also arranged at the central parts of the distribution profiles of all the jig frame buttresses 2; specifically, all dome buttresses 1 are arranged in a circular ring I; all the jig frame buttresses 2 are arranged to form a circular ring II, and the jig frame buttresses 2 are also arranged in the center of the circular ring II; the circular ring II is positioned in the circular ring I, and the circular ring II and the circular ring I are concentrically arranged.
S2-2, each jig frame buttress 2 at the arrangement contour position is provided with a lower corner fulcrum 4; a central barrel frame 9 is arranged on the moulding bed buttress 2 at the center of the outline; the bottom of a central barrel frame 9 is fixed on the jig frame buttress 2, bracket beams 10 are annularly arranged on the central barrel frame 9 close to the bottom barrel body, and a plurality of upper corner pivots 8 are arranged on the upper part of the central barrel frame 9 in an annular manner;
s2-3, installing beam string 6, wherein two ends of each beam string 6 are respectively connected with free ends of a lower corner fulcrum 4 and an upper corner fulcrum 8;
s2-4, synchronously assembling a plurality of vertical face arch film jig frame bodies, and connecting the vertical face arch film jig frame bodies through secondary beams to form a spherical arch film jig frame;
s2-5, according to the operation space requirement, installing the upper inner side platform 3 on the lower corner fulcrum 4, the beam string 6 and the upper corner fulcrum 8 in sequence along the longitudinal direction;
s3, each dome submodule is hung to the corresponding dome buttress 2 to form a ring section, and the ring section is connected with the outer ring platform 7 to form a whole; the dome submodule is pre-provided with an outer annular platform 7 and an outer longitudinal platform 11;
s4, completing the connection and forming of the first annular layer section of the dome through the inner side platform 3 and the outer side longitudinal platform 11; the size measurement control of the dome forming process is completed by installing a measuring platform on the central cylinder frame 9;
s5, finishing the second annular layer section of the dome backwards according to the processes of the steps S3 and S4, and additionally finishing the connection between the annular layer sections of the dome through the inner side platform 3 and the outer side annular platform 7;
s6, controlling the integral height of the arch film jig frame by adjusting the top elevation of the central barrel frame 9, and being suitable for forming domes with different radians; through the adjustment of the radial distance of the lower corner fulcrum 4, the radius of the arch film moulding bed is controlled, the arch film moulding bed is suitable for forming domes with different spans, and the specific operation is as follows:
s6-1, releasing the connection between the beam string 6 and the pivot 8 at the upper corner, and lowering the beam string 6 to the bracket beam 10;
s6-2, adjusting the installation elevation of the central barrel frame 9;
s6-3, lifting the beam string 6, and connecting with the upper corner pivot 8;
s7, vertically transporting the large component through a central channel of the central barrel frame 9; transporting the small components through the inboard platform 3; the dome inner items are assembled and installed through the outer annular platform 7 and the central barrel frame 9;
s8, reflecting and projecting the measured positioning points to the ground of a dome assembly field (positioning point identification) through the center reference point of the dome, and improving the rapid measurement positioning and checking of subsequent installation items;
s9, adjusting the platform according to the steps S6-S8 to finish other processes such as item installation, coating and the like;
the dome is a spherical or ellipsoidal dome, and the spherical dome is taken as an example in the embodiment. All the inner side platforms 3 are distributed in a stair structure along the longitudinal direction; the outer annular platforms 7 are distributed along all the outer annular platforms 7 in the longitudinal direction to form a stair structure, and the outer annular platforms 7 are positioned at the joint of adjacent annular layers of the dome; the outer longitudinal platforms 11 are located at the respective dome adjacent sub-module junctions.
Example 2
The embodiment provides a forming construction jig frame for a nuclear island double-shell dome arch membrane of a nuclear power station, which is used in the forming construction method for the nuclear island double-shell dome arch membrane of the nuclear power station provided by the embodiment 1 and comprises a central cylinder frame 9, a plurality of jig frame buttresses 2, a plurality of lower corner fulcrums 4, a plurality of beam string 6 and a plurality of upper corner fulcrums 8;
the jig frame buttresses 2 are used for being arranged to form an annular outline, and the outer diameter of the annular outline is smaller than the diameter of the dome; the geometric center part of the annular outline is also provided with a jig frame buttress 2;
a lower corner fulcrum 4 is arranged on each jig frame buttress 2 at the position of the annular outline; a central barrel frame 9 is arranged on the jig frame buttress 2 at the center of the annular outline; the bottom of the central barrel frame 9 is fixed on the jig frame buttress 2, and a plurality of upper corner supporting points 8 are arranged at the upper part of the central barrel frame 9 along the annular direction;
two ends of each beam string 6 are respectively connected with the free ends of the lower corner supporting point 4 and the upper corner supporting point 8.
A bracket beam 10 is annularly arranged on the central barrel frame 9 close to the bottom barrel body; the platform comprises a plurality of inner side platforms 3, outer side longitudinal platforms 11 and outer side circumferential platforms 7; along the longitudinal direction, an upper inner side platform 3 is sequentially arranged on a lower corner fulcrum 4, a beam string 6 and an upper corner fulcrum 8; the outer longitudinal platform 11 and the outer circumferential platform 7 are intended to be mounted on the dome body 5.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (6)

1. A nuclear power station nuclear island double-shell dome arched film forming construction method is characterized by comprising the following steps:
s1, dividing a dome into a plurality of annular layers, wherein each annular layer is divided into a plurality of sub-modules along the longitudinal direction;
s2, installing an arch membrane jig:
s2-1, arranging a dome buttress (1) according to the dome profile diameter and the dome sub-module assembling longitudinal welding seam position; the tire frame buttresses (2) are uniformly distributed according to the stress condition of the dome, the distribution profiles of all the tire frame buttresses (2) are arranged in the distribution profile of the dome buttresses (1), and the tire frame buttresses (2) are also arranged at the central parts of the distribution profiles of all the tire frame buttresses (2);
s2-2, each jig frame buttress (2) at the arrangement contour position is provided with a lower corner fulcrum (4); a center barrel frame (9) is arranged on the moulding bed buttress (2) at the center of the outline; the bottom of the central barrel frame (9) is fixed on the jig frame buttress (2), and a plurality of upper corner supporting points (8) are arranged on the upper part of the central barrel frame (9) along the annular direction;
s2-3, installing beam string beams (6), wherein two ends of each beam string beam (6) are respectively connected with free ends of a lower corner fulcrum (4) and an upper corner fulcrum (8);
s2-4, synchronously assembling a plurality of vertical face arch film jig frame bodies, and connecting the vertical face arch film jig frame bodies through secondary beams to form a spherical arch film jig frame;
s2-5, according to the operation space requirement, sequentially installing an upper inner side platform (3) on a lower corner fulcrum (4), a beam string (6) and an upper corner fulcrum (8) along the longitudinal direction;
s3, hanging each dome sub-module to a corresponding dome buttress (2) to form a ring-shaped section, and connecting an outer annular platform (7) to form a whole; the dome submodule is pre-provided with an outer annular platform (7) and an outer longitudinal platform (11);
s4, completing the connection and forming of the first annular layer section of the dome through the inner side platform (3) and the outer side longitudinal platform (11); the size measurement control of the dome forming process is completed by installing a measuring platform on the central cylinder frame (9);
s5, finishing the second annular layer section of the dome backwards according to the processes of S3 and S4, and additionally finishing the connection between the annular layer sections of the dome through an inner side platform (3) and an outer side annular platform (7);
s6, controlling the integral height of the arch film jig frame by adjusting the top elevation of the central barrel frame (9), and being suitable for forming domes with different radians; the radial distance of the lower corner supporting points (4) is adjusted to control the radius of the arch film jig, so that the arch film jig is suitable for forming domes with different spans;
s7, vertically transporting the large component through a central channel of a central barrel frame (9); transporting the small components through the inner platform (3); the dome inner items are assembled and installed through the outer annular platform (7) and the central barrel frame (9);
s8, reflecting and projecting the measured positioning points to the ground of a dome assembly field through the dome center reference point, and improving the rapid measurement positioning and checking of subsequent installation items;
s9, finishing the procedures including the installation and coating of the items by adjusting the platform according to the steps S6-S8;
the dome is a spherical or ellipsoidal dome.
2. The nuclear power plant nuclear island double-shell dome arch membrane forming construction method is characterized in that a bracket beam (10) is annularly arranged on the central cylinder frame (9) close to the bottom cylinder body, and the arch membrane jig adjustment method in the step S6 comprises the following steps:
s6-1, removing the connection between the beam string (6) and the pivot (8) at the upper corner, and putting the beam string (6) down on the bracket beam (10);
s6-2, adjusting the installation elevation of the central barrel frame (9);
and S6-3, lifting the beam string (6) and connecting the beam string with the upper corner pivot (8).
3. The nuclear power plant nuclear island double-shell dome arched film forming construction method is characterized in that all the inner side platforms (3) are distributed in a stair structure along the longitudinal direction.
4. The nuclear power station nuclear island double-shell dome membrane forming construction method is characterized in that all outer annular platforms (7) in the longitudinal direction are distributed in a stair structure, and the outer annular platforms (7) are located at the joint of adjacent annular layers of the dome.
5. The nuclear power plant nuclear island double-shell dome membrane forming construction method according to claim 1, characterized in that the outer longitudinal platform (11) is located at the joint of corresponding dome adjacent submodules.
6. The nuclear power station nuclear island double-shell dome membrane forming construction method as claimed in claim 1, characterized in that in step S2-1, all dome buttresses (1) are arranged in a circular ring I; the jig frame buttresses (2) are uniformly distributed according to the stress condition of the dome, all the jig frame buttresses (2) are distributed to form a circular ring II, and the jig frame buttresses (2) are also distributed in the center of the circular ring II; the circular ring II is positioned in the circular ring I, and the circular ring II and the circular ring I are concentrically arranged.
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CN110259150B (en) * 2019-05-22 2021-05-04 山东核电设备制造有限公司 Assembling support and assembling method for steel containment vessel top head of nuclear power station

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