CN111395623B - Steel arch-shaped roof structure of nuclear power station and assembling construction method thereof - Google Patents
Steel arch-shaped roof structure of nuclear power station and assembling construction method thereof Download PDFInfo
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- CN111395623B CN111395623B CN202010229191.4A CN202010229191A CN111395623B CN 111395623 B CN111395623 B CN 111395623B CN 202010229191 A CN202010229191 A CN 202010229191A CN 111395623 B CN111395623 B CN 111395623B
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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
- E04B7/00—Roofs; Roof construction with regard to insulation
- E04B7/08—Vaulted roofs
- E04B7/10—Shell structures, e.g. of hyperbolic-parabolic shape; Grid-like formations acting as shell structures; Folded structures
- E04B7/102—Shell structures
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/38—Arched girders or portal frames
- E04C3/40—Arched girders or portal frames of metal
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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
- 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
- E04G21/142—Means in or on the elements for connecting same to handling apparatus
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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
- E04G25/00—Shores or struts; Chocks
Abstract
The invention discloses a steel arch roof structure of a nuclear power station and an assembly construction method thereof. The steel arch roof structure assembling construction method comprises the steps of assembling an arch main beam plane assembly part, arranging an assembling support system, vertically assembling the main beam plane assembly part and four-column supports, vertically assembling an arch main beam, assembling an arch secondary beam unit, adjusting positioning precision, assembling an arch roof framework, assembling a roof structure panel and assembling the whole arch roof, finally disassembling the assembling support system and the assembling positioning system, and finally assembling the steel arch roof structure; the assembling construction method can obviously reduce structural deformation, simplify construction procedures, improve installation precision and improve construction efficiency, and can be applied to the field of building construction of the same type of structures.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a steel arch roof structure of a nuclear power station and an assembling construction method thereof.
Background
The steel arch-shaped roof structure is used as a new reactor type nuclear power station roof structure, the sealing performance of the roof is required to be ensured while the structural requirement is met, and no precedent of the construction of the roof structure exists in the construction of the existing built or under-built nuclear power station; in the construction of civil similar structures, a small-sized spare part field assembly construction method is mostly adopted, and the defects of complex assembly process, difficulty in control of precision, long assembly period, frequent use of hoisting equipment, long overhead working time, high safety risk and the like exist. The steel arch roof is of a single-curved-surface arc structure, is large in span, high in height, thin in panel, heavy in weight, large in assembly difficulty, high in risk and complex in construction process, occupies long time of hoisting equipment by adopting a small-sized spare part on-site assembly construction method, has more crossed construction, is high in construction cost, and is difficult to predict construction safety and quality risk. Therefore, an arch steel structure roof which is short in construction period, controllable in quality, low in safety risk, economical and feasible and a construction method thereof are needed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a steel arch roof structure of a nuclear power station and an assembling construction method thereof, aiming at the defects of the prior art, the structural deformation can be effectively controlled, the construction efficiency and the construction quality are obviously improved, the construction process is simplified, the assembling period is shortened, the safety risk is reduced, and the sealing performance of the roof can be ensured while the assembled steel arch roof structure of the nuclear power station meets the structural requirements.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows: the utility model provides a nuclear power station steel arch roofing structure, includes arch girder, arch secondary beam unit, roofing structure panel and equipment braced system, and the parallel interval distribution of arch girder constitutes arch roofing skeleton through arch secondary beam unit connection, and roofing structure panel welding forms sealed steel arch roofing structure on arch roofing skeleton.
Further, the arch girder is the arch welding H shaped steel of tip area straight section, by first arc H shaped steel, second arc H shaped steel and third arc H shaped steel segmentation equipment shaping, wherein, first arc H shaped steel is the vertical section arc H shaped steel of lower extreme area, and two vertical section arc H shaped steel symmetries of lower extreme area set up in the both ends of arch girder, and two second arc H shaped steels weld respectively in two first arc H shaped steel upper ends, third arc H shaped steel sets up in the middle part of arch girder, connects two second arc H shaped steels in an organic whole.
Further, first arc H shaped steel upper end (being close to second arc H shaped steel end) is predetermine and is stayed the surplus, second arc H shaped steel upper end (being close to third arc H shaped steel end) is predetermine and is stayed the surplus, third arc H shaped steel both ends and first arc H shaped steel lower extreme (keeping away from second arc H shaped steel end), second arc H shaped steel lower extreme (keeping away from third arc H shaped steel end) all do not stay the surplus at the mill processing groove.
Furthermore, the arched secondary beam units are lattice type prefabricated plates composed of hot-rolled H-shaped steel I, hot-rolled H-shaped steel II and thin steel plates, and the adjacent arched main beams are connected through welding, wherein the hot-rolled H-shaped steel II is vertically fixed on the hot-rolled H-shaped steel I, the hot-rolled H-shaped steel I which are parallel to each other are connected, the hot-rolled H-shaped steel II are parallel to each other, and the thin steel plates are welded on the upper surfaces of the lattices composed of the hot-rolled H-shaped steel I and the hot-rolled H-shaped.
Furthermore, the roof structure panel is composed of a plurality of thin steel plates and welded on the upper surfaces of the arched main beams and the arched secondary beam units, so that the sealing function of the roof is guaranteed.
The invention also provides an assembly construction method of the steel arch roof structure of the nuclear power station, which comprises the following steps:
step one, assembling an arched main beam plane assembly part: respectively welding and assembling the two second arc H-shaped steels and the upper ends of the two first arc H-shaped steels to form an arch main beam plane assembly part;
step two, assembling a support system arrangement: the assembling and supporting system comprises four pipe column supports, a tower support and stay cables, the four pipe column supports and the tower support are respectively arranged on an arched roof assembling site, the height of an arched main beam is adjusted (deviation in elevation direction) in the assembling process by controlling and adjusting an adjusting screw rod at the top of the four pipe column supports, and the height of an arched secondary beam unit is adjusted (deviation in elevation direction) in the assembling process by controlling and adjusting an adjusting screw rod at the top of the tower support
Step three, vertically assembling the main beam plane assembly part and four tubular column supports: the method comprises the following steps of finding the gravity center of a main beam plane assembly part by using three-dimensional modeling software, arranging a lifting lug on the main beam plane assembly part, turning the main beam plane assembly part from a horizontal state to a vertical state by using a truck crane and hoisting the main beam plane assembly part to the upper part of an arched roof assembly site, wherein an assembly positioning system comprises an embedded part, a limiting section steel and a fastening incline, putting the bottom end of a first arc-shaped H-shaped steel into the limiting section steel on the upper surface of the embedded part, measuring a positioning control network point on the upper surface of the upper end of a second arc-shaped H-shaped steel, fixing the first arc-shaped H-shaped steel by using an inclined iron, putting the lower part of the upper end of the second arc-shaped H-shaped steel above a;
step four, vertically assembling the arched girder: according to the adjusted positions of the plane assembly parts of the main beams on the two sides, a truck crane is adopted to hoist the third arc-shaped H-shaped steel above the plane assembly parts of the two main beams, and the third arc-shaped H-shaped steel is assembled and welded with the plane assembly parts of the two main beams to form an arch main beam;
step five, assembling the arched secondary beam unit: taking one side of the assembled and welded arched main beam as a reference, hoisting the arched secondary beam units one by one above a tower support of an arched roof assembly site by adopting a truck crane, and positioning according to a positioning axis on the assembled arched main beam;
step six, repeating the step two, the step three and the step four to assemble the next arched girder, and aligning the two arched girders front and back;
seventhly, adjusting positioning precision, welding and assembling the arched roof skeleton: measuring positioning control network points of the arched main beam and the arched secondary beam unit by using a total station and a level gauge, adjusting positioning precision of the arched main beam and the arched secondary beam unit by using an adjusting screw rod adjusting device above the assembly supporting system, and finally welding the arched main beam and the arched secondary beam unit into a whole to form an arched roof skeleton;
step eight, assembling the roof structure panel: hoisting the roof structure panels one by one above the arched roof skeleton by using an automobile crane, and welding the roof structure panels with the upper surfaces of the arched main beams and the arched secondary beams;
and step nine, repeating the step five, the step six, the step seven and the step eight to finish the assembly of the reformed arched roof.
And step ten, disassembling the assembling support system and the assembling positioning system.
Furthermore, the four pipe column supports are vertically supported at the joint of the second arc-shaped H-shaped steel and the third arc-shaped H-shaped steel through adjusting screws, and the tower support is vertically supported at the joint of the first hot-rolled H-shaped steel and the thin steel plate through adjusting screws.
Furthermore, two lifting lugs for fixing the sling are arranged at the upper part of the arched girder plane assembly piece on each side in the third step, and the positions of the lifting lugs are determined by the stress points of the arched plane assembly pieces.
Further, in the third step, the positioning control mesh point of the second arc-shaped H-shaped steel is arranged at the axis position of the upper end surface of the main beam plane assembling piece.
And step seven, the positioning control network points of the arched main beam are arranged on the surfaces of the embedded parts at the lower openings of the two ends of the arched main beam, and the positioning control network points of the arched secondary beam unit are arranged on the side surface of the arched main beam at the welding side of the arched secondary beam unit.
The invention has the following beneficial effects: the invention provides a steel arched roof structure of a nuclear power station and an assembling construction method thereof, wherein an arched main beam assembling mode combining plane assembling and vertical assembling is adopted, an assembling support system ensures construction safety in the assembling process, and an assembling positioning system and each positioning precision adjusting operation ensure the positioning precision of the arched main beam, the arched secondary beam unit and the whole roof structure, so that the assembling precision of an arched roof is integrally controlled, and the safety risk is reduced; the arch secondary beam units are assembled into the lattice type prefabricated slab in a factory, so that the assembly construction process is simplified, the construction period of an assembly stage is shortened, the construction efficiency is improved, and the deformation control requirement and the assembly error requirement of the arch roof assembly can be met; the roof structure panel is laid and welded on the arched roof skeleton, so that the finally assembled steel arched roof structure of the nuclear power station meets the structural requirements and simultaneously ensures the sealing performance of the roof.
Drawings
FIG. 1 is a schematic view of the arched roof structure of the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a schematic view of the arcuate main beam planar assembly of the present invention assembled;
FIG. 4 is a schematic illustration of the arcuate main beam planar assembly of the present invention being hoisted;
FIG. 5 is a schematic view of the arcuate main beam planar assembly of the present invention in place;
FIG. 6 is a schematic view of the arcuate main beam planar assembly of the present invention secured thereto;
FIG. 7 is a schematic view of an arched girder positioning control network point of the present invention;
FIG. 8 is a vertical assembly view of the arched main beam of the present invention;
FIG. 9 is a schematic structural view of an arched sub-beam unit according to the present invention;
FIG. 10 is a schematic view of the hoisting of the arched sub-beam unit of the present invention;
fig. 11 is a schematic diagram of adjusting the positioning accuracy of the assembly support system of the present invention, wherein a is a schematic diagram of adjusting the adjusting screw of the arched main beam, and B is a schematic diagram of adjusting the adjusting screw of the arched secondary beam unit.
Wherein the reference numerals are: the novel roof structure comprises, by weight, 1-1 parts of arched main beams, 1-1 parts of first arched H-shaped steel, 1-2 parts of second arched H-shaped steel, 1-3 parts of third arched H-shaped steel, 2 parts of arched secondary beam units, 2-1 parts of first hot-rolled H-shaped steel, 2-2 parts of second hot-rolled H-shaped steel, 2-3 parts of thin steel plates, 3 parts of roof structure panels, 4-1 parts of four-column supports, 4-2 parts of tower supports, 4-3 parts of stay cables, 5-1 parts of embedded parts, 5-2 parts of limiting section steel and 5-3 parts.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
As shown in figures 1-11, the steel arched roof structure of the nuclear power station comprises an arched main beam 1, an arched secondary beam unit 2 and a roof structure panel 3, wherein the arched main beam 1 is arched welding H-shaped steel with a straight section at the end part, and is formed by assembling a first arched H-shaped steel 1-1, a second arched H-shaped steel 1-2 and a third arched H-shaped steel 1-3 in a segmented mode, wherein the first arched H-shaped steel 1-1 is arched H-shaped steel with a vertical section at the lower end, the two arched H-shaped steels with vertical sections at the lower end are symmetrically arranged at two ends of the arched main beam 1, the two second arched H-shaped steels 1-2 are respectively welded at the upper ends of the two first arched H-shaped steels 1-1, the third arched H-shaped steel 1-3 is arranged in the middle of the arched main beam 1 and is connected with the two second arched H-shaped steels 1-2 into a whole, and the arched secondary beam unit, The prefabricated plate is a lattice type prefabricated plate consisting of hot-rolled H-shaped steel II 2-2 and thin steel plates 2-3, wherein the hot-rolled H-shaped steel II 2-2 is vertically fixed on the hot-rolled H-shaped steel I2-1, the hot-rolled H-shaped steel I2-1 which are parallel to each other are connected, the hot-rolled H-shaped steel II 2-2 are parallel to each other, the thin steel plates 2-3 are welded on the upper surface of a lattice consisting of the hot-rolled H-shaped steel I2-1 and the hot-rolled H-shaped steel II 2-2, the arched main beams 1 are distributed in parallel at intervals and connected through the arched secondary beam units 2 to form an arched roof framework, the roof structure panel 3 is composed of a plurality of thin steel plates, and the thin steel plates are paved and welded on the upper.
The method comprises the steps of presetting the upper end (close to the end 1-2 of the second arc H-shaped steel) of first arc H-shaped steel 1-1 and reserving the allowance, presetting the upper end (close to the end 1-3 of the third arc H-shaped steel) of the second arc H-shaped steel 1-2 and reserving the allowance, and presetting the allowance at the two ends of the third arc H-shaped steel 1-3, wherein the allowance is not reserved at the factory machining groove at the lower end (far from the end 1-2 of the second arc H-shaped steel) of the first arc H-shaped steel 1-1 and the lower end (far from the end 1-3 of the third arc H-shaped steel) of the second arc.
Further, the number of the arched girders 1 of the steel arched roof structure of the nuclear power plant is determined according to actual engineering requirements, and the steel arched roof structure in the embodiment is composed of 5 arched girders 1.
Further, the arched secondary beam units 2 are connected with the adjacent arched main beams 1 through welding, the number and the size of the arched secondary beam units 2 are adjusted according to the arc size of the arched main beams 1, and the adjacent arched main beams 1 in the embodiment are connected through welding by 5 sections of the arched secondary beam units 2.
The assembling construction method of the steel arch roof structure of the nuclear power station comprises the following steps:
step one, assembling an arched main beam plane assembly part: the two second arc-shaped H-shaped steels 1-2 and the upper ends of the two first arc-shaped H-shaped steels 1-1 are respectively welded and assembled to form an arch-shaped main beam plane assembly part, so that the vertical assembly workload and the safety risk are reduced;
step two, assembling a support system arrangement: the assembling support system comprises four pipe column supports 4-1, tower support 4-2 and stay cables 4-3, the four pipe column supports 4-1 and the tower support 4-2 are respectively arranged on an arched roof assembling site, the height of the arc end of an arched main beam 1 in the assembling process is adjusted by controlling and adjusting an adjusting screw rod at the top of the four pipe column supports 4-1, the height of an arched secondary beam unit 2 in the assembling process is adjusted by controlling and adjusting an adjusting screw rod at the top of the tower support 4-2, and the assembling precision can be accurately controlled;
step three, vertically assembling the main beam plane assembly part and the four-column support 4-1: the gravity center of a main beam plane assembly part is found by utilizing three-dimensional modeling software, a lifting lug is arranged on the main beam plane assembly part, a truck crane is adopted to overturn the main beam plane assembly part from a horizontal state to a vertical state and lift the main beam plane assembly part to the upper part of an arched roof assembly site, an assembly positioning system comprises an embedded part 5-1, a limit profile steel 5-2 and a fastening inclined iron 5-3, the bottom end of a first arc H-shaped steel 1-1 is placed into the limit profile steel 5-2 on the upper surface of the embedded part 5-1, a positioning control network point on the upper surface of the upper end of a second arc H-shaped steel 1-2 is measured, then the fastening inclined iron 5-3 is used for fixing, meanwhile, a four-pipe column support 4-1 is placed below the upper end of the second arc H-shaped steel 1-2, and the side surface of the upper end of the second arc H, the construction safety is ensured;
step four, vertically assembling the arched girder 1: according to the adjusted positions of the plane assembly parts of the main beams on the two sides, a truck crane is adopted to hoist the third arc-shaped H-shaped steel 1-3 to the positions above the plane assembly parts of the two main beams, and the third arc-shaped H-shaped steel 1-3 is assembled and welded with the plane assembly parts of the two main beams to form an arc-shaped main beam 1 (four pipe column supports 4-1 are vertically supported at the bottom of the joint of the second arc-shaped H-shaped steel 1-2 and the third arc-shaped;
step five, assembling the arched secondary beam unit 2: taking one side of an assembled and welded arched main beam (1) as a reference, hoisting the arched secondary beam units 2 one by one above a tower support 4-2 of an arched roof assembly site by using a truck crane, and positioning according to a positioning axis on the assembled arched main beam 1 (the tower support 4-2 is vertically propped at the joint of a hot-rolled H-shaped steel I2-1 and a thin steel plate 2-3);
step six, repeating the step two, the step three and the step four to assemble the next arched girder 1, and aligning the two arched girders 1 front and back;
seventhly, adjusting positioning precision, welding and assembling the arched roof skeleton: measuring positioning control network points of the arched main beam 1 and the arched secondary beam unit 2 by using a total station and a level gauge, adjusting positioning accuracy (deviation in elevation direction) of the arched main beam 1 and the arched secondary beam unit 2 by using an adjusting screw above an assembly supporting system, and finally welding the arched main beam 1 and the arched secondary beam unit 2 into a whole to form an arched roof skeleton and ensure assembly accuracy;
step eight, assembling the roof structure panel 3: hoisting the roof structure panels 3 one by one above the arched roof skeleton by using a truck crane, and welding the roof structure panels with the upper surfaces of the arched main beams 1 and the arched secondary beam units 2;
step nine, repeating the step five, the step six, the step seven and the step eight to finish the assembly of the reformed arched roof;
and step ten, disassembling the assembling support system and the assembling positioning system.
Furthermore, the upper part of the arched girder plane assembly piece on each side in the third step is provided with two lifting lugs for fixing the sling, and the position of each lifting lug is determined by the stress point of the arched plane assembly piece, so that the lifting safety is ensured.
Further, in the third step, the positioning control network points of the second arc-shaped H-shaped steel 1-2 are arranged at the axis position of the upper end surface of the main beam plane assembling piece.
Furthermore, in the seventh step, the positioning control network points of the arched main beams 1 are arranged on the surfaces of the embedded parts 5-1 at the lower openings of the two ends of the arched main beams, and the positioning control network points of the arched secondary beam units 2 are arranged on the side surfaces of the arched main beams 1 at the welding sides of the arched secondary beam units 2 and are used for controlling the deviation of the axis and the elevation direction of each arched main beam 1, so that the purpose of controlling the overall precision of the steel arched roof structure is achieved.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (7)
1. An assembling construction method of a steel arch roof structure of a nuclear power station is characterized in that the steel arch roof structure of the nuclear power station comprises an arch main beam (1), an arch secondary beam unit (2) and a roof structure panel (3), the arch main beam (1) is arch welding H-shaped steel with straight sections at the end part, and is formed by assembling a first arc H-shaped steel (1-1), a second arc H-shaped steel (1-2) and a third arc H-shaped steel (1-3) in a segmented mode, wherein the first arc H-shaped steel (1-1) is arc H-shaped steel with vertical sections at the lower end part, the two arc H-shaped steels with vertical sections at the lower end part are symmetrically arranged at the two ends of the arch main beam (1), the two second arc H-shaped steels (1-2) are respectively welded at the upper ends of the two first arc H-shaped steels (1-1), and the third arc H-shaped steel (1-3) is arranged in the middle part, connecting two second arc H-shaped steels (1-2) into a whole;
the assembling construction method comprises the following steps:
step one, assembling an arched main beam plane assembly part: respectively welding and assembling the upper ends of the two second arc H-shaped steels (1-2) and the upper ends of the two first arc H-shaped steels (1-1) to form an arch main beam plane assembly part;
step two, assembling a support system arrangement: the assembling support system comprises four tubular column supports (4-1), tower supports (4-2) and stay cables (4-3), the four tubular column supports (4-1) and the tower supports (4-2) are respectively arranged on an arched roof assembling site, the height of the arc end of an arched main beam (1) in the assembling process is adjusted by controlling and adjusting screws at the tops of the four tubular column supports (4-1), and the height of an arched secondary beam unit (2) in the assembling process is adjusted by controlling and adjusting screws at the tops of the tower supports (4-2);
step three, vertically assembling the main beam plane assembly part and the four-column support (4-1): the method comprises the steps of finding the gravity center of a main beam plane assembly part by using three-dimensional modeling software, arranging lifting lugs on the main beam plane assembly part, turning the main beam plane assembly part from a horizontal state to a vertical state by using a truck crane and hoisting the main beam plane assembly part to the upper side of an arched roof assembly site, wherein an assembly positioning system comprises an embedded part (5-1), limiting section steel (5-2) and fastening inclined iron (5-3), placing the bottom end of a first arc H-shaped steel (1-1) into the limiting section steel (5-2) on the upper surface of the embedded part (5-1), measuring a positioning control network point on the upper surface of the upper end of a second arc H-shaped steel (1-2), fixing by using the fastening inclined iron (5-3), placing the lower part of the upper end of the second arc H-shaped steel (1-2) above a four-column support (4-1), and using a stay cable (4-3) and a ground on the side surface of the upper end of the second arc Surface fixing;
step four, vertically assembling the arched girder (1): according to the adjusted positions of the plane assembly parts of the main beams on the two sides, a truck crane is adopted to hoist the third arc-shaped H-shaped steel (1-3) above the plane assembly parts of the main beams, and the third arc-shaped H-shaped steel is assembled and welded with the plane assembly parts of the main beams to form an arch main beam (1);
step five, assembling the arched secondary beam unit (2): taking one side of the assembled and welded arched main beam (1) as a reference, hoisting the arched secondary beam units (2) one by one above a tower support (4-2) of an arched roof assembly site by adopting a truck crane, and positioning according to a positioning axis on the assembled arched main beam (1); the arched secondary beam unit (2) is a lattice type prefabricated slab consisting of a first hot-rolled H-shaped steel (2-1), a second hot-rolled H-shaped steel (2-2) and a thin steel plate (2-3), wherein the second hot-rolled H-shaped steel (2-2) is vertically fixed on the first hot-rolled H-shaped steel (2-1), the first hot-rolled H-shaped steels (2-1) which are parallel to each other are connected, the second hot-rolled H-shaped steel (2-2) is parallel to each other, and the thin steel plate (2-3) is welded on the upper surface of a lattice consisting of the first hot-rolled H-shaped steel (2-1) and the second hot-rolled H-shaped steel (2-;
step six, repeating the step two, the step three and the step four to assemble the next arched girder (1), and aligning the two arched girders (1) front and back;
seventhly, adjusting positioning precision, welding and assembling the arched roof skeleton: measuring positioning control network points of the arched main beam (1) and the arched secondary beam unit (2) by adopting a total station and a level gauge, adjusting positioning accuracy of the arched main beam (1) and the arched secondary beam unit (2) by utilizing an adjusting screw rod above an assembly supporting system, and finally welding the arched main beam (1) and the arched secondary beam unit (2) into a whole to form an arched roof framework;
step eight, assembling the roof structure panel (3): hoisting the roof structure panels (3) to the upper part of the arched roof framework one by adopting an automobile crane, and welding the roof structure panels with the upper surfaces of the arched main beams (1) and the arched secondary beam units (2) to form a sealed steel arched roof structure;
step nine, repeating the step five, the step six, the step seven and the step eight to complete the assembly of the whole arched roof;
and step ten, disassembling the assembling support system and the assembling positioning system.
2. The assembly construction method according to claim 1, wherein: the allowance is reserved at the upper end of the first arc-shaped H-shaped steel (1-1), the allowance is reserved at the upper end of the second arc-shaped H-shaped steel (1-2), and the allowance is not reserved at the two ends of the third arc-shaped H-shaped steel (1-3), the lower end of the first arc-shaped H-shaped steel (1-1) and the lower end of the second arc-shaped H-shaped steel (1-2) in the factory machining groove.
3. The assembly construction method according to claim 2, wherein: the roof structure panel (3) is composed of a plurality of thin steel plates and is welded on the upper surfaces of the arched main beam (1) and the arched secondary beam unit (2).
4. The assembly construction method according to claim 3, wherein: the four pipe column supports (4-1) are vertically supported at the joint of the second arc-shaped H-shaped steel (1-2) and the third arc-shaped H-shaped steel (1-3) through adjusting screws, and the tower support (4-2) is vertically supported at the joint of the hot-rolled H-shaped steel (2-1) and the thin steel plate (2-3) through adjusting screws.
5. The assembly construction method according to claim 4, wherein: in the third step, two lifting lugs for fixing the lifting ropes are arranged at the upper part of the arched girder plane assembly piece on each side, and the positions of the lifting lugs are determined by the stress points of the arched plane assembly piece.
6. The assembly construction method according to claim 5, wherein: in the third step, the positioning control network points of the second arc-shaped H-shaped steel (1-2) are arranged at the axis position of the upper end surface of the girder plane assembling piece.
7. The assembly construction method according to claim 6, wherein: and seventhly, positioning control mesh points of the arched main beam (1) are arranged on the surfaces of the embedded parts (5-1) at the lower openings of the two ends of the arched main beam, and positioning control mesh points of the arched secondary beam units (2) are arranged on the side surfaces of the arched main beam (1) on the welding side with the arched secondary beam units (2).
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