CN107338868B - Large spherical screen mounting system and construction method thereof - Google Patents
Large spherical screen mounting system and construction method thereof Download PDFInfo
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- CN107338868B CN107338868B CN201710751787.9A CN201710751787A CN107338868B CN 107338868 B CN107338868 B CN 107338868B CN 201710751787 A CN201710751787 A CN 201710751787A CN 107338868 B CN107338868 B CN 107338868B
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- 238000010276 construction Methods 0.000 title claims abstract description 143
- 239000002184 metal Substances 0.000 claims abstract description 39
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- 238000009434 installation Methods 0.000 claims abstract description 20
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000009194 climbing Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 241000282326 Felis catus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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- 239000003351 stiffener Substances 0.000 description 1
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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
- E04B1/3211—Structures with a vertical rotation axis or the like, e.g. semi-spherical structures
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- 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
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/36—Scaffolds for particular parts of buildings or buildings of particular shape, e.g. for stairs, cupolas, domes
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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
- E04B2001/3229—Arched structures; Vaulted structures; Folded structures constructed using a boom
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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
- E04B2001/327—Arched structures; Vaulted structures; Folded structures comprised of a number of panels or blocs connected together forming a self-supporting structure
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- Movable Scaffolding (AREA)
Abstract
A large spherical screen mounting system comprises a spherical screen and a construction platform arranged on the inner side of the spherical screen. The spherical screen comprises support columns which are arranged on the ground at intervals in an arc shape, a lower chord arc beam horizontally connected to the top surfaces of the support columns, an equatorial arc beam arranged right above the lower chord arc beam, a spherical steel structure net rack connected to the lower chord arc beam and the equatorial arc beam and a metal screen connected to the inner spherical surface of the spherical steel structure net rack; the metal screen comprises an upper metal screen correspondingly arranged on the upper net rack, a middle metal screen correspondingly arranged on the middle net rack and a lower metal screen correspondingly arranged on the lower net rack. The installation method can be used for installing the steel structure net rack and the metal screen of the spherical screen of the large-scale 4D cinema.
Description
Technical Field
The invention relates to the field of spherical screen construction, in particular to a large spherical screen installation system and a construction method thereof.
Background
The full hall scaffold of conventional installation is directly set up along the arcwall face of ball curtain according to vertical and horizontal distance 1m, step 1.8m, and every layer is crooked into the same arc according to the ball curtain radian along two horizon bars that the arcwall face was striden, and this strides lays the scaffold board, communicates the packway on every layer, and the height of setting up of whole support body is 21 meters. Because the installation precision of the spherical screen net rack is high, the method has dense steel pipes and is difficult to measure and position in the air; the metal screen sheet is thin, the protection requirement of a finished product is high, the method has more materials during disassembly, and the protection difficulty of the finished product is high; the conventional scaffold has large steel pipe amount, long construction period for assembling, disassembling and installing, and is not economical.
Disclosure of Invention
The invention aims to provide a large spherical screen mounting system and a construction method thereof, which aim to solve the problem of difficult mounting of a large spherical screen; and the problems that the mounting frame body is large in dismounting amount, generates much dust and affects the mounting of the metal screen are solved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a large spherical screen mounting system comprises a spherical screen and a construction platform arranged on the inner side of the spherical screen.
The spherical screen comprises support columns which are arc-shaped and are arranged on the ground at intervals, a lower chord arc beam which is horizontally connected to the top surfaces of the support columns, an equator arc beam which is arranged right above the lower chord arc beam, a spherical steel structure net rack which is connected to the lower chord arc beam and the equator arc beam, and a metal screen which is connected to the inner spherical surface of the spherical steel structure net rack.
The spherical steel structure net rack comprises an upper net rack, a middle net rack and a lower net rack; the upper net rack is a section of upper chord spherical net rack arranged above the equator arc beam, the middle net rack is a section of lower chord spherical net rack arranged between the equator arc beam and the lower chord arc beam, and the lower net rack is a part of net rack arranged below the lower chord arc beam; the middle net rack and the lower net rack are connected into a whole to form a 1/4 spherical net rack.
The metal screen comprises an upper metal screen correspondingly arranged on the upper net rack, a middle metal screen correspondingly arranged on the middle net rack and a lower metal screen correspondingly arranged on the lower net rack.
The upper net rack comprises a first net rack main body, an arc-shaped horizontal ejector rod connected to the top edge of the first net rack main body and arc-shaped inclined side rods connected to the edges of two sides of the first net rack main body, and the two end parts of the horizontal ejector rod are not more than the two end parts of the equatorial arc-shaped beam.
The inner side of the horizontal ejector rod is connected with a horizontal ejector rod reinforcing rod, and the inner side of the inclined side rod is connected with an inclined side rod reinforcing rod.
The first net rack main body is of a grid structure formed by mutually welding and connecting a group of weft rod pieces, a group of warp rod pieces, a group of left inclined rod pieces and a group of right inclined rod pieces.
The structure of the second net rack main body of the middle net rack and the structure of the third net rack main body of the lower net rack are the same as the structure of the first net rack main body of the part of the net racks above the equator arc-shaped beam.
The border that middle part rack and lower part rack connect the 1/4 spherical rack of whole constitution is connected with semicircular vertical side bar, the inboard of vertical side bar is connected with a vertical side bar stiffener.
The three points of the outer end part of the equatorial arc beam, the lower end part of the horizontal ejector rod and the upper end part of the vertical side rod are connected and fixed through fasteners.
The construction platform comprises a scaffold construction platform, a high movable frame construction platform erected on the scaffold construction platform and a short movable frame construction platform arranged on the ground.
The top surface of the scaffold construction platform does not exceed the horizontal plane of the equator arc-shaped beam.
Scaffold frame construction platform includes scaffold frame main part, vertical logical long connection at the upper and lower walking ladder of scaffold frame main part one side, connects the diagonal bracing cantilever frame on scaffold frame main part opposite side upper portion, the interval sets up the scaffold board on scaffold frame main part and diagonal bracing cantilever frame and connects the guardrail that is used for protecting high movable frame construction platform around scaffold frame main part top surface.
The scaffold main body is a groined frame structure formed by connecting transverse rods, vertical rods and upright rods.
The overall longitudinal section of the inclined supporting cantilever frame is in an inverted right-angled triangle shape, one side of a vertical side of the inclined supporting cantilever frame is connected with the scaffold main body, the inclined supporting cantilever frame comprises a plurality of horizontal layers formed by connecting horizontal rods and vertical rods and parallel inclined rods obliquely connected among the plurality of horizontal layers, and the outer side edge of each horizontal layer is in an arc shape; the horizontal layer is positioned in the same horizontal plane with the transverse rod and the vertical rod of the scaffold main body.
The scaffold boards are correspondingly erected on the horizontal layer of the inclined support cantilever frame and the transverse rods and the vertical rods of the scaffold main body.
The scaffold main body and the outer side of the inclined support cantilever frame are connected with a reinforced inclined support.
The high movable frame construction platform comprises a high platform main frame body, a high platform climbing section, a high platform construction platform plate, a high platform connection platform plate and a high platform travelling wheel, wherein the high platform climbing section is connected to the high platform main frame body in a staggered mode along the height direction, the high platform construction platform plate is paved on the high platform main frame body at intervals along the height direction, and the high platform travelling wheel is arranged on the bottom surface of the high platform main frame body.
High platform construction platform board is established in being close to spherical steel construction rack one side, and outer tip parallel and level, high platform connection platform board is established between adjacent high platform cat ladder section or between adjacent high platform construction platform board.
The high movable frame construction platform is placed on a scaffold board on the top surface of the scaffold construction platform.
The short movable frame construction platform comprises a short platform main frame body, a short platform ladder stand arranged on one side of the short platform main frame body, a short platform construction platform plate paved on the top surface of the short platform main frame body and a fence enclosed around the top surface of the short platform main frame body.
The bottom surface of the short platform main frame body is provided with short platform traveling wheels, and the short platform traveling wheels are provided with self-locking mechanisms.
A construction method applying the large spherical screen mounting system comprises the following steps:
step one, positioning and installing a support column according to a control point;
step two, mounting the lower chord arc beam on the support column;
step three, installing an equatorial arc beam right above the lower chord arc beam;
fourthly, erecting a scaffold main body of the scaffold construction platform on the inner side of the support column;
installing an inclined supporting cantilever frame of the scaffold construction platform on one side of the scaffold main body close to the spherical screen;
step six, erecting a high movable frame construction platform on the scaffold construction platform;
step seven, installing an upper net rack and an upper metal screen by using a high movable frame construction platform;
step eight, mounting a middle net rack and a middle metal screen by utilizing a scaffold main body and an inclined support cantilever frame of the scaffold construction platform;
step nine, dismantling the high movable frame construction platform, the inclined support cantilever frame and the scaffold main body;
step ten, placing the short movable frame construction platform on the ground at the inner side of the support column;
and step eleven, mounting a lower net rack and a lower metal screen by using a short movable frame construction platform to finish the mounting of the spherical screen.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
the spherical steel structure net rack and the metal screen are arranged in a segmented mode, and the mode that the scaffold construction platform, the high movable frame construction platform and the low movable frame construction platform are combined to be installed in a segmented mode is adopted to replace the existing mode that a full scaffold is singly erected to install the spherical screen, so that the problems of large size and long construction period of the traditional scaffold are solved, the expense of erecting and dismantling is reduced, and the movable frame can be additionally arranged to accelerate the installation speed; the method can pay off the line on the construction platform, and uses a total station and a vertical instrument to perform space positioning of the spherical curtain net rack node, thereby solving the problem that the conventional scaffold cannot effectively measure and position the net rack node, and the conventional full scaffold has large volume, long construction period and poor economical efficiency; the later-period disassembly amount is large, so that excessive dust in the cinema is caused, and the protection of the installed finished metal screen is not facilitated; the cinema is internally provided with the upper frame body which is not shielded, and meanwhile, the illumination is enhanced, so that the cinema is more favorable for safe construction of installation personnel.
The invention can be widely applied to the installation of various large spherical screens.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic perspective view of a mounted spherical screen.
FIG. 2 is a schematic structural diagram corresponding to the first construction step and the second construction step of the present invention.
Fig. 3 is a schematic structural diagram corresponding to the third construction step and the fourth construction step.
FIG. 4 is a schematic structural diagram corresponding to the fifth construction step, the sixth construction step and the seventh construction step.
Fig. 5 is a schematic structural diagram corresponding to the construction step eight and the construction step nine.
Fig. 6 is a schematic structural diagram corresponding to the construction step ten.
Fig. 7 is an exploded view of the installation of the spherical steel structural net rack.
Reference numerals are as follows: 1-support column, 2-lower chord arc beam, 3-equator arc beam, 4-middle net rack, 5-lower net rack, 6-upper net rack, 6.1-horizontal ejector rod, 6.2-inclined side rod, 7-short movable rack construction platform, 8-scaffold construction platform, 8.1-scaffold main body, 8.2-up and down walking ladder, 8.3-oblique support cantilever frame, 9-high movable rack construction platform and 10-fastener.
Detailed Description
The embodiment is shown in figure 1, a large spherical screen installation system and a construction method thereof, the height of the engineering spherical screen is about 22m, and the installation method can be used for installing a steel structure net rack and a metal screen of a large 4D cinema spherical screen, and comprises a spherical screen and a construction platform arranged on the inner side of the spherical screen; the spherical screen comprises support columns 1 which are arranged on the ground at intervals in an arc shape, a lower chord arc beam 2 horizontally connected to the top surfaces of the support columns, an equatorial arc beam 3 arranged right above the lower chord arc beam, a spherical steel structure net rack connected to the lower chord arc beam and the equatorial arc beam and a metal screen connected to the inner spherical surface of the spherical steel structure net rack; the spherical steel structure net rack comprises an upper net rack, a middle net rack 4 and a lower net rack 5, wherein the upper net rack is a section of upper chord spherical net rack arranged above an equator arc-shaped beam, the middle net rack is a section of lower chord spherical net rack arranged between the equator arc-shaped beam and the lower chord arc-shaped beam, and the lower net rack is a part of net rack arranged below the lower chord arc-shaped beam; the middle net rack and the lower net rack are connected into a whole to form a 1/4 spherical net rack; the metal screen comprises an upper metal screen correspondingly arranged on the upper net rack, a middle metal screen correspondingly arranged on the middle net rack and a lower metal screen correspondingly arranged on the lower net rack; the upper net rack 6 comprises a first net rack main body, an arc-shaped horizontal ejector rod 6.1 connected to the top edge of the first net rack main body and arc-shaped inclined side rods 6.2 connected to the edges of the two sides of the first net rack main body, and the two end parts of the horizontal ejector rod do not exceed the two end parts of the equatorial arc-shaped beam; the inner side of the horizontal ejector rod is connected with a horizontal ejector rod reinforcing rod, and the inner side of the inclined side rod is connected with an inclined side rod reinforcing rod; the first net rack main body is of a grid structure formed by mutually welding and connecting a group of weft rod pieces, a group of warp rod pieces, a group of left inclined rod pieces and a group of right inclined rod pieces; the structures of the second net rack main body of the middle net rack 4 and the third net rack main body of the lower net rack 5 are the same as the structure of the first net rack main body of the upper net rack 6; the edge of a 1/4 spherical net rack integrally formed by connecting the middle net rack 4 and the lower net rack 5 is connected with a semicircular vertical side rod, and the inner side of the vertical side rod is connected with a vertical side rod reinforcing rod; the outer end part of the equatorial arc beam 3, the lower end part of the horizontal ejector rod and the upper end part of the vertical side rod are fixedly connected through steel pipe fasteners to ensure the stability of the whole platform.
Referring to fig. 3 and 5, the construction platform includes a scaffold construction platform 8, a high movable frame construction platform 9 erected on the scaffold construction platform, and a low movable frame construction platform 7 arranged on the ground; the top surface of the scaffold construction platform 8 does not exceed the horizontal plane of the equatorial arc beam; the scaffold construction platform (8) comprises a scaffold main body 8.1, an upper walking ladder 8.2, a lower walking ladder 8.2, an inclined supporting and cantilever frame 8.3, scaffold boards and a guardrail, wherein the upper walking ladder and the lower walking ladder are vertically connected to one side of the scaffold main body in a through manner, the inclined supporting and cantilever frame is connected to the upper part of the other side of the scaffold main body, the scaffold boards are erected on the scaffold main body and the inclined supporting and cantilever frame at intervals, and the guardrail is connected to the periphery of the top surface of the scaffold main body and used for protecting the high-mobility frame construction platform; the scaffold main body is a groined frame structure formed by connecting transverse rods, vertical rods and upright rods; the inclined support cantilever frame is characterized in that the longitudinal section of the whole inclined support cantilever frame is in an inverted right-angled triangle shape, one side of a vertical edge of the inclined support cantilever frame is connected with a scaffold main body, the inclined support cantilever frame comprises a plurality of horizontal layers formed by connecting horizontal rods and vertical rods, and parallel inclined rods obliquely connected among the horizontal layers, and the outer side edge of each horizontal layer is in a circular arc shape; the horizontal layer is positioned in the same horizontal plane with the transverse rod and the vertical rod of the scaffold main body; the scaffold boards are correspondingly erected on the horizontal layer of the inclined supporting cantilever frame and the transverse rod and the vertical rod of the scaffold main body; the outer sides of the scaffold main body and the inclined support cantilever frame are connected with a reinforced inclined strut; the high moving frame construction platform 9 comprises a high platform main frame body, high platform climbing sections which are connected to the high platform main frame body in a staggered manner along the height direction, high platform construction platform plates which are laid on the high platform main frame body at intervals along the height direction, high platform connecting platform plates and high platform traveling wheels which are arranged on the bottom surface of the high platform main frame body; the high platform construction platform plate is arranged at one side close to the spherical steel structure net rack, the outer end part of the high platform construction platform plate is flush, and the high platform connection platform plate is arranged between the ladder sections of the adjacent high platforms or between the construction platform plates of the adjacent high platforms; the high movable frame construction platform is placed on a scaffold board on the top surface of the scaffold construction platform; the short moving frame construction platform 7 comprises a short platform main frame body, a short platform ladder stand arranged on one side of the short platform main frame body, a short platform construction platform plate paved on the top surface of the short platform main frame body and a fence enclosed around the top surface of the short platform main frame body; the bottom surface of the short platform main frame body is provided with short platform traveling wheels, and the short platform traveling wheels are provided with self-locking mechanisms.
The height of the spherical screen is about 22m, the installation method can be used for installing a steel structure net rack and a metal screen of the spherical screen of the large-scale 4D cinema, the height of a common steel pipe scaffold is 11m, a platform of a scaffold plate and a template is laid after the common steel pipe scaffold is erected, a 10m high finished product socket type disc buckle moving frame is assembled to install the upper spherical screen net rack and the metal screen, and rollers capable of being pushed are arranged at the bottom of the moving frame and are pushed to be installed by four people.
The design form of the existing ball curtain structure is usually three parts of a steel structure net rack, a net rack supporting upright post, an arc beam and an equatorial beam structure resisting horizontal component force, according to the characteristics of the ball curtain structure, the mounting method can be popularized and applied to all ball curtains of the type, the whole ball curtain is divided into three parts for mounting, a middle net rack 4 between a lower chord arc beam and a scaffold platform, a lower net rack 5 below the lower chord arc beam and an upper net rack above a scaffold construction platform, so the mounting is also divided into three parts, a common steel pipe scaffold construction platform is erected, the height of the scaffold construction platform is determined according to the height of the equator of the ball curtain and can be lower than the height of the equator, generally speaking, according to the radian change of the ball curtain, the horizontal distance between the edge of the scaffold construction platform and the equator of the ball curtain cannot be greater than the operating distance of an operator, the height of a high moving rack construction platform assembled on the scaffold construction platform is determined by the height difference between the height of the ball curtain and the platform, the installation personnel can install the components at the top of the ball curtain, and the moving rack construction platform can be used for installing the part above the platform; the part of the spherical screen net rack between the lower chord arc beam and the top surface of the scaffold construction platform extends outwards, one side of the scaffold main body close to the spherical screen net rack is connected with an oblique supporting and hanging rack, and a scaffold board is laid according to the step pitch of 1.8m to form a channel along the spherical screen for installing a middle net rack 4 between the lower chord arc beam and the top surface of the scaffold construction platform; and after the upper and middle ball curtains are installed, dismantling the scaffold construction platform, and assembling a lower net rack below the lower chord arc-shaped beam on the ground by using the short movable frame construction platform.
The invention relates to a construction method of a large spherical screen installation system, which comprises the following steps:
1. and (3) supporting and installing a screen: the spherical screen of the invention is a column type support, the position of the support column is accurately positioned through a control point, the support column of the lower net rack below 5.833m is firstly installed, the lower chord arc beam 2 is installed on the support column 1, then the equatorial arc beam is installed right above the lower chord arc beam 2,
2. erecting a scaffold construction platform: set up scaffold frame construction platform 8 in support column 1 inboard: the scaffold main body is made of 48-by-3.5 mm steel pipes and is erected according to the length-width distance of 0.8m and the step pitch of 1.8m, the erected height of the scaffold construction platform is 11.0m, the scaffold main body is tied with the structure, and the scaffold boards are nailed tightly by 50mm thick wood boards and double-layer templates; an inclined supporting and hanging frame is erected on one side, close to a spherical screen, of a scaffold body at the height position of a lower chord arc beam, namely more than 5.833m, the step pitch is 1.8m, the cross distance of each span of a platform surface of an outward hanging part is 0.8m, the edge of a scaffold construction platform 8 is 150mm away from the spherical screen surface, and the vertical distance between the edge and an equatorial arc beam is not more than 400mm, so that the erecting height of the scaffold construction platform 8 can be positioned, and meanwhile, a guardrail and an edge strip are arranged on the edge of the scaffold construction platform to prevent the high moving frame construction platform from rolling out of the scaffold construction platform; 1.6m wide scaffold boards are paved at the edges of the three layers of reinforced diagonal rods in a spanning manner, so that installation personnel can install the middle net rack and the middle metal screen; placing the high movable frame construction platform on the scaffold construction platform 8; and after the high movable frame construction platform and the scaffold construction platform are dismantled, the short movable frame construction platform is placed on the ground of the position to be constructed, and the walking wheels are locked.
3. Installation of the spherical screen: installing an upper net rack and an upper metal screen with the height of more than 13.5m by using a high movable frame construction platform, after the installation is finished, installing a middle net rack and a middle metal screen with the height of 5.833 m-13.5 m by using a scaffold main body and an inclined support overhanging frame of the scaffold construction platform, detaching the high movable frame construction platform and the scaffold construction platform 8, changing the high movable frame construction platform into a low movable frame construction platform, installing a lower net rack and a lower metal screen with the elevation of less than 5.833m, and completing the installation of a steel structure net rack and the metal screen; when promoting high removal frame construction platform, installer need lower the support body, when removing a certain position, will link to each other rope and structure on the high removal frame construction platform and keep stable, installer need be the safety belt.
Claims (7)
1. A construction method of a large spherical screen installation system is characterized by comprising the following steps: the large spherical screen mounting system comprises a spherical screen and a construction platform arranged on the inner side of the spherical screen;
the spherical screen comprises support columns (1) which are arranged on the ground at intervals in an arc shape, a lower chord arc beam (2) horizontally connected to the top surfaces of the support columns, an equatorial arc beam (3) arranged right above the lower chord arc beam, a spherical steel structure net rack connected to the lower chord arc beam and the equatorial arc beam and a metal screen connected to the inner spherical surface of the spherical steel structure net rack;
the spherical steel structure net rack comprises an upper net rack, a middle net rack (4) and a lower net rack (5); the upper net rack is a section of upper chord spherical net rack arranged above the equator arc-shaped beam, the middle net rack is a section of lower chord spherical net rack arranged between the equator arc-shaped beam and the lower chord arc-shaped beam, and the lower net rack is a part of net rack arranged below the lower chord arc-shaped beam; the middle net rack and the lower net rack are connected into a whole to form a 1/4 spherical net rack;
the metal screen comprises an upper metal screen correspondingly arranged on the upper net rack, a middle metal screen correspondingly arranged on the middle net rack and a lower metal screen correspondingly arranged on the lower net rack;
the construction platform comprises a scaffold construction platform (8), a high movable frame construction platform (9) erected on the scaffold construction platform and a low movable frame construction platform (7) arranged on the ground;
the top surface of the scaffold construction platform (8) does not exceed the horizontal plane of the equatorial arc-shaped beam;
the scaffold construction platform (8) comprises a scaffold main body (8.1), an upper walking ladder (8.2) vertically connected to one side of the scaffold main body in a through manner, an oblique supporting and cantilever frame (8.3) connected to the upper part of the other side of the scaffold main body, scaffold plates erected on the scaffold main body and the oblique supporting and cantilever frame at intervals, and guardrails connected to the periphery of the top surface of the scaffold main body and used for protecting the high-mobility frame construction platform;
the scaffold main body is a groined frame structure formed by connecting a transverse rod, a vertical rod and a vertical rod;
the overall longitudinal section of the inclined supporting cantilever frame (8.3) is in an inverted right-angled triangle shape, one side of a vertical side is connected with the scaffold main body, the inclined supporting cantilever frame comprises a plurality of horizontal layers formed by connecting horizontal rods and vertical rods and parallel inclined rods obliquely connected among the horizontal layers, and the outer side edge of each horizontal layer is in an arc shape; the horizontal layer is positioned in the same horizontal plane with the transverse rod and the vertical rod of the scaffold main body;
the scaffold boards are correspondingly erected on the horizontal layer of the inclined supporting cantilever frame and the transverse rod and the vertical rod of the scaffold main body;
the outer sides of the scaffold main body and the inclined support cantilever frame are connected with a reinforced inclined support;
the construction method comprises the following specific steps:
step one, positioning and installing a support column (1) according to a control point;
step two, mounting the lower chord arc beam (2) on the support column (1);
step three, installing an equatorial arc beam (3) right above the lower chord arc beam (2);
fourthly, erecting a scaffold main body of the scaffold construction platform (8) on the inner side of the support column (1);
fifthly, mounting the inclined supporting cantilever frame of the scaffold construction platform (8) on one side of the scaffold main body close to the spherical screen;
step six, a high movable frame construction platform (9) is erected on the scaffold construction platform (8);
seventhly, installing an upper net rack and an upper metal screen by using a high movable frame construction platform (9);
installing a middle net rack and a middle metal screen by using a scaffold main body and an inclined supporting and overhanging frame of the scaffold construction platform (8);
step nine, dismantling the high movable frame construction platform (9), the inclined support cantilever frame and the scaffold main body;
step ten, placing the short movable frame construction platform (7) on the ground at the inner side of the support column (1);
step eleven, installing a lower net rack and a lower metal screen by using a short movable frame construction platform (7) to finish the installation of the spherical screen.
2. The construction method of a large spherical screen mounting system according to claim 1, characterized in that: the upper net rack (6) comprises a first net rack main body, an arc-shaped horizontal ejector rod (6.1) connected to the top edge of the first net rack main body and arc-shaped inclined side rods (6.2) connected to the edges of the two sides of the first net rack main body, and the two end parts of the horizontal ejector rod do not exceed the two end parts of the equatorial arc-shaped beam;
the inner side of the horizontal ejector rod is connected with a horizontal ejector rod reinforcing rod, and the inner side of the inclined side rod is connected with an inclined side rod reinforcing rod;
the first net rack main body is of a grid structure formed by mutually welding and connecting a group of weft rod pieces, a group of warp rod pieces, a group of left inclined rod pieces and a group of right inclined rod pieces.
3. The construction method of a large spherical screen mounting system according to claim 2, characterized in that: the structure of the second net rack main body of the middle net rack (4) and the structure of the third net rack main body of the lower net rack (5) are the same as the structure of the first net rack main body of the upper net rack (6).
4. The construction method of a large spherical screen mounting system according to claim 3, characterized in that: the edge of the 1/4 spherical net rack integrally formed by connecting the middle net rack (4) and the lower net rack (5) is connected with a semicircular vertical side rod, and the inner side of the vertical side rod is connected with a vertical side rod reinforcing rod.
5. The construction method of a large spherical screen mounting system according to claim 4, characterized in that: the outer end part of the equatorial arc beam (3), the lower end part of the horizontal ejector rod and the upper end part of the vertical side rod are fixedly connected through fasteners (10).
6. The construction method of a large spherical screen mounting system according to claim 1, characterized in that: the high moving frame construction platform (9) comprises a high platform main frame body, high platform ladder sections which are connected to the high platform main frame body in a staggered manner along the height direction, high platform construction platform plates which are paved on the high platform main frame body at intervals along the height direction, high platform connecting platform plates and high platform travelling wheels which are arranged on the bottom surface of the high platform main frame body;
the high platform construction platform plate is arranged at one side close to the spherical steel structure net rack, the outer end part of the high platform construction platform plate is flush, and the high platform connection platform plate is arranged between the ladder sections of the adjacent high platforms or between the construction platform plates of the adjacent high platforms;
the high movable frame construction platform is placed on a scaffold board on the top surface of the scaffold construction platform.
7. The construction method of a large spherical screen mounting system according to claim 1, characterized in that: the short moving frame construction platform (7) comprises a short platform main frame body, a short platform ladder stand arranged on one side of the short platform main frame body, a short platform construction platform plate paved on the top surface of the short platform main frame body and a fence enclosed around the top surface of the short platform main frame body;
the bottom surface of the short platform main frame body is provided with short platform traveling wheels, and the short platform traveling wheels are provided with self-locking mechanisms.
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