CN115584878A - Steel lining bottom plate and frustum modular structure and construction method thereof - Google Patents

Abstract

The invention discloses a steel lining bottom plate and frustum modular structure and a construction method thereof, wherein the modular structure is a thin plate basin-shaped structure consisting of a central area circular bottom plate, a side wall plate and an inclined section ring plate; the lower end of the side wall plate is fixed with the periphery of the circular bottom plate of the central area through a first transition section; the upper end of the side wall plate is fixed with the lower end of the inclined section annular plate through a second transition section; the central area circular bottom plate is formed by assembling a plurality of bottom plates, and the bottom plates are divided into a rectangular bottom plate, a trapezoidal bottom plate and a bottom plate with an arc; the side wall plates are formed by assembling a plurality of wall plates; the inclined section ring plate is formed by splicing a plurality of inclined plates; the quantity of swash plate equals and the one-to-one correspondence with the quantity of wallboard, and the swash plate lower extreme is fixed through the upper end of second changeover portion with corresponding wallboard. The invention improves the quality of installation and welding, reduces the safety risk, improves the on-site welding condition, improves the labor efficiency, saves the construction period by 50 days, and creates greater economic benefit and social benefit.

Description

Steel lining bottom plate and frustum modular structure and construction method thereof

Technical Field

The invention belongs to the technical field of civil construction, and particularly relates to a steel lining bottom plate and frustum modular structure and a construction method thereof.

Background

As the nuclear power of China enters the safe and efficient development period, with the advance of the marketization process, nuclear power owners increasingly put forward higher target requirements on shortening the construction period, reducing the construction cost and improving the engineering quality. The modular design and construction technology is proved by practice in nuclear power construction at home and abroad, is an effective mode for reducing field construction amount, potential safety hazards, construction period and engineering cost, and is one of effective measures for solving the contradiction between nuclear power safe and efficient batch construction, resource shortage and quality safety at present in China.

The modular construction technology fundamentally changes the traditional nuclear power construction mode and gradually turns to an intensive prefabrication mode in a factory from the dispersed labor-intensive type in the past. The method draws a great deal of parallel operation to the traditional construction concept, deeply crosses the processes of civil engineering, installation, debugging and the like by means of advanced design, manufacturing and construction technologies, and has great influence on the construction period, the construction cost, the quality and the safe and civilized construction of nuclear power construction projects.

The steel lining of the nuclear island containment vessel is a sealing lining metal structure of a nuclear island reactor plant, has the main function of preventing radioactive substances from leaking out in an accident state, is one of important safety protection barriers of the reactor plant, and belongs to nuclear quality protection primary equipment and nuclear safety secondary equipment. With the acceleration of the pace of nuclear power construction and the improvement of construction requirements in China, the traditional construction process is difficult to meet the requirements of modern nuclear power construction, and a new and more efficient nuclear power station steel lining construction process is developed to meet the requirements of safe, high-quality and efficient nuclear power station construction, so that the process becomes one of important problems to be solved urgently by nuclear island civil contractors of the nuclear power station.

The structure of the steel lining of the containment vessel of the Hualongyi nuclear power station is divided into a bottom plate, a truncated cone, a cylinder body, steel lining accessories (a penetrating piece sleeve, a gate sleeve and an anchoring piece), a bracket, a dome and the like. The bottom plate and the frustum are formed by welding steel plates which are made of P265GH and 6mm in thickness, the traditional technology is that plates are manufactured in a workshop, and field entities are spliced and welded according to working procedures, so that the working procedure time is long.

As a domestic third-generation large pressurized water reactor advanced reactor type, the construction quality and the construction efficiency of the Hualong I nuclear power station are concerned in all aspects, and the construction quality and the construction efficiency of the steel lining of the containment vessel as a nuclear secondary device are required to be fully improved. In order to improve the construction efficiency, the bottom plate and the frustum part of the steel lining of the containment vessel of the Hualong I nuclear power station are constructed by adopting modularized integral prefabrication and hoisting installation. Modularized construction is carried out, the size of a bottom plate field installation component is large, and the back of a bottom plate welding seam is required to be ground flat and then integrally hoisted in place in a modularized mode, so that the welding process of the original steel keel as the base plate cannot meet the modularized construction requirement.

The production mode of 'man-sea tactics' depending on a large amount of human input can not meet the requirement of the current nuclear engineering construction more and more, the problem of over dependence on labor force can be effectively solved through a modularization technology and effective technological measures, and the method is the most effective method for improving efficiency and reducing labor cost.

In order to solve the construction period problem, a new construction and efficient automatic welding process must be researched and developed, so that the construction and welding construction efficiency is further improved, the welding quality is ensured, the labor cost and the construction period are reduced, and the guarantee is provided for subsequent construction.

Disclosure of Invention

The invention provides a steel lining bottom plate, a frustum modular structure and a construction method thereof, which aim to overcome the defects of the prior art.

To achieve the above objects, the present invention provides a steel lining bottom plate and frustum modular structure, which has the following features: the modular structure is a thin plate basin-shaped structure consisting of a central area circular bottom plate, side wall plates and inclined section ring plates; the circular bottom plate of the central area is of a horizontally arranged circular structure; the side wall plate is of an annular structure with a vertically arranged side wall; the inclined section ring plate is an inclined ring structure with the side wall inclined outwards from bottom to top; the lower end of the side wall plate is fixed with the periphery of the circular bottom plate in the central area through a first transition section; the upper end of the side wall plate is fixed with the lower end of the inclined section annular plate through a second transition section; the central area circular bottom plate is formed by splicing a plurality of bottom plates, and the bottom plates are divided into a rectangular bottom plate, a trapezoidal bottom plate and a bottom plate with an arc; a plurality of rectangular bottom plates are spliced into a rectangle and used as the central part of the circular bottom plate in the central area; the plurality of trapezoidal bottom plates are assembled around the plurality of rectangular bottom plates and assembled together with the plurality of rectangular bottom plates to form an octagon; the plurality of bottom plates with circular arcs are spliced around the plurality of trapezoidal bottom plates, and are spliced with the plurality of rectangular bottom plates and the plurality of trapezoidal bottom plates to form a circular bottom plate with a central area; the side wall plates are formed by splicing a plurality of wall plates; the inclined section ring plate is formed by splicing a plurality of inclined plates; the quantity of swash plate equals and the one-to-one correspondence with the quantity of wallboard, and the swash plate lower extreme is fixed through the upper end of second changeover portion with corresponding wallboard.

Further, the present invention provides a steel lining bottom plate and frustum modular structure, which may also have the following features: the central area circular bottom plate is formed by splicing 24 bottom plates, namely 8 rectangular bottom plates, 8 trapezoidal bottom plates and 8 bottom plates with circular arcs, and all the bottom plates are spliced by welding; the side wall plates are formed by splicing 12 wall plates, and all the wall plates are spliced into a whole by welding; the inclined section ring plate is formed by splicing 12 inclined plates, and the inclined plates are spliced into a whole by welding.

Further, the present invention provides a steel lining bottom plate and frustum modular structure, which may also have the following features: annular angle steel and vertical angle steel are welded on the outer side of the wall plate of the side wall plate;

further, the present invention provides a steel lining bottom plate and frustum modular structure, which may also have the following features: and radial angle steel is welded on the inner side of the inclined plate of the inclined section ring plate.

Further, the present invention provides a steel lining bottom plate and frustum modular structure, which may also have the following features: and a third transition section is fixed at the upper opening of the inclined section ring plate.

The invention also provides a construction method of the steel lining bottom plate and the frustum modular structure, which has the following characteristics:

firstly, building an assembly platform; the assembly platform comprises a support frame at the bottom and a flat steel plate at the upper part, and the whole assembly platform is circular; gaps are reserved between the tiled steel plates at the positions of the field welding seams corresponding to the splicing platforms;

secondly, manufacturing a first transition section, a second transition section and a third transition section;

thirdly, manufacturing a bottom plate of the circular bottom plate in the central area;

fourthly, manufacturing a wallboard of the side wallboard;

fifthly, manufacturing an inclined plate of the inclined section ring plate;

sixthly, assembling the circular bottom plate in the central area according to an assembling line, and assembling the circular bottom plate into 24 bottom plates; the specific assembling process of the circular bottom plate in the central area comprises the following steps: hoisting a bottom plate positioned at the center in place, carrying out field assembly on the bottom plate positioned at the center, setting a balancing weight and a welding tool, carrying out field welding on the bottom plate positioned at the center, carrying out nondestructive testing, cutting allowance, carrying out in-place positioning on the bottom plate positioned at the periphery, carrying out field assembly on the bottom plate positioned at the periphery, setting a balancing weight and a welding tool, carrying out field welding on the bottom plate positioned at the periphery, carrying out nondestructive testing, and carrying out overall dimension inspection;

the seventh step: assembling the side wall plates: assembling 12 wall plates, arranging buttress columns at the outer sides of the head parts of two ends of each wall plate, adjusting the verticality and the radius by the buttress columns, welding 11 seams after the radius and the verticality are qualified, welding another 1 seam at last, reserving a margin not less than 30mm at an upper opening, and ensuring positive deviation during blanking; performing secondary cutting during field assembly to ensure that the overall size meets the design requirement; the concrete assembling process of the side wall plate comprises the following steps: the method comprises the following steps of on-site measurement and setting-up-setting of a buttress column-hoisting of a wall plate in place-inserting of a gap plate, a glasses plate and a taper pin after adjustment and positioning-platform installation of a longitudinal seam-longitudinal seam assembly-longitudinal seam welding, nondestructive testing-circular seam assembly-circular seam welding, nondestructive testing-cutting of shrinkage longitudinal seam allowance-shrinkage longitudinal seam and residual circular seam welding-connection angle steel installation and connection piece welding-on-site paint repair-installation of an upper walkway plate;

the eighth step: assembling an inclined section ring plate: assembling by 12 inclined plates, and arranging 48 inclined supports; the concrete assembling process of the inclined section ring plate comprises the following steps: the method comprises the steps of on-site measurement and paying off, inclined plate support column setting, inclined plate hoisting in place, gap plate inserting after adjustment and positioning, glasses plate, taper pin and elevation adjustment plate longitudinal seam assembly, longitudinal seam welding, nondestructive testing, circular seam assembly, circular seam welding, nondestructive testing, shrinkage longitudinal seam allowance cutting, shrinkage longitudinal seam and residual circular seam welding, nondestructive testing and overall dimension inspection.

Further, the invention provides a construction method of the steel lining bottom plate and the frustum modular structure, which can also have the following characteristics: in the first step, the concrete method for building the splicing platform comprises the following steps:

s1.1, cleaning a prefabricated site, selecting a reference elevation according to a terrain elevation, positioning and setting out;

s1.2, pouring a concrete foundation and installing a top surface embedded part;

s1.3, positioning and paying off the axis position of a support column, measuring the height of an embedded part on the top surface of a foundation, mounting the support column by taking the highest point as a reference, and welding the lower end of the support column with the embedded part;

s1.4, checking the top surface elevation and the flatness of the support column;

s1.5, erecting a main beam on the support column after the elevation is qualified, wherein the main beam is connected with the top of the support column through a bolt; the secondary beams are erected on the main beams and connected through bolts, the secondary beams are connected through angle steel, and the top surface elevation is the same as the secondary beam elevation and connected through welding;

s1.6, paying off, paving and paving a steel plate: paying off the laying position of the flat steel plate; laying a flat steel plate, reserving a gap of 150-200 mm at the seam splicing position of the circular bottom plate in the central area, and laying a layer of fireproof cloth on the flat steel plate.

Further, the invention provides a construction method of the steel lining bottom plate and the frustum modular structure, which can also have the following characteristics: in the second step, the manufacturing methods of the first transition section, the second transition section and the third transition section are as follows: material receiving, paying off, cutting and blanking, identification transplanting, bending and forming, beveling machine processing, bending and forming, stress relief heat treatment, splicing beveling processing, splicing beveling inspection, splicing assembly, welding, deformation correction, nondestructive testing, size inspection and numbering and storing; prefabricating and installing the first transition section and the second transition section, processing by adopting a bending machine with a 30mm plate bending requirement, and blanking a steel plate into a long strip shape; bending into L-shaped steel by using a bending machine; milling two sides of the L-shaped steel into corresponding transition areas by adopting a milling machine, rolling the L-shaped steel into corresponding arcs by using arc rolling equipment, performing stress relief heat treatment on the bending areas, and assembling the L-shaped steel into a circular ring by welding; positioning according to the paying-off position; prefabricating and installing a third transition section, namely machining by adopting a bending machine with a bending requirement of a 22mm plate, and blanking a steel plate into a long strip shape; bending the L-shaped steel into L-shaped steel by using a bending machine; milling two sides of the L-shaped steel by a milling machine to form corresponding transition areas, rolling the L-shaped steel into corresponding arcs by arc rolling equipment, performing stress relief heat treatment on the bending areas, and assembling the L-shaped steel into a circular ring by welding; and carrying out positioning according to the pay-off position.

Further, the invention provides a construction method of the steel lining bottom plate and the frustum modular structure, which can also have the following characteristics: in the third step, the manufacturing process of the rectangular bottom plate and the trapezoidal bottom plate is as follows: material getting, material discharging, splicing plate assembly, welding, correction, nondestructive testing, secondary cutting, dimension inspection and numbering storage; the manufacturing process of the bottom plate with the circular arc comprises the following steps: material getting, material blanking, splicing plate assembly, welding, correction, nondestructive testing, secondary cutting, size inspection, assembly with a first transition section, welding, correction, nondestructive testing, size inspection and numbering storage; reserving allowance not smaller than 25mm in length of the bottom plate with the arc, reserving allowance not smaller than 10mm in length and width directions after assembly welding of each trapezoid bottom plate is completed, and reserving allowance ends in the direction close to the outer side wall plate;

in the fourth step, the manufacturing method of the wall panel for assembling the side wall panel comprises the following steps: material getting, blanking, assembling of splicing plates, welding, correction, nondestructive testing, secondary cutting, dimension inspection, paying off of positions of a penetrating piece and a stiffening rib, inspection, fixing and forming of the splicing plates on a moulding bed, assembling of stiffening rib angle steel and a wall plate, inspection, pressing of an I-shaped steel beam on the wall plate, welding of the stiffening rib angle steel and the wall plate, correction, nondestructive testing, positioning of a connecting piece, welding of the connecting piece, inspection of the whole dimension, welding and acceptance of a screw rod of a walkway platform, sand blasting and painting, and numbering and storing;

in the fifth step, the manufacturing method of the inclined plate for assembling the inclined section ring plate comprises the following steps: material taking, material discharging, identification transplanting, splicing plate assembly, welding, correction, nondestructive testing, assembly with a second transition section, welding, correction, nondestructive testing, size inspection, sand blasting painting and numbering and storing; the length direction of the inclined plate is increased by not less than 30 mm.

Further, the invention provides a construction method of the steel lining bottom plate and the frustum modular structure, which can also have the following characteristics: the circular bottom plate in the central area adopts an MAG automatic welding method by intelligent laser tracking and a ceramic liner single-side welding double-side forming efficient welding process; the width of the butt weld is 5-8 mm; the back of the bottom plate adopts a ceramic liner as a non-permanent liner to force the back weld joint to form, so that the construction of single-side welding and double-side forming welding of the steel liner is realized, the center line of the liner is ensured to be aligned with the center line of the weld joint when the ceramic liner is pasted, and the aluminum foil tape is ensured to be fixed firmly; the side wall plate adopts a laser tracking MAG automatic welding method, a ceramic liner is used as a non-permanent liner, and a welding seam deposited metal is supported during welding to force the back welding seam to be formed, so that the single-side welding and double-side forming of the welding seam are realized; three procedures of priming, interlayer cleaning and capping are carried out in the welding process; the welding takes the wall plate between the two contraction joints as the center, one half of the welding line is welded along the clockwise direction, and the other half is welded along the anticlockwise direction; the transverse seam is continuously welded along the clockwise direction at a section which is far away from the shrinkage seam of the vertical seam; and welding the inclined section ring plate on the wall plate on the same side by adopting an MAG automatic welding method through laser tracking.

The invention has the beneficial effects that: the invention provides a steel lining bottom plate and a frustum modular structure and a construction method thereof, which adopt integral modular construction and parting and partitioning optimization for the steel lining bottom plate (a central area circular bottom plate) and the frustum (a side wall plate and an inclined section annular plate), reduce the welding work amount by an optimization scheme, facilitate field construction, effectively save the construction period, ensure the quality and the sealing property, improve the labor efficiency, facilitate the shortening of a main key line for 50 days and create the economic benefit of 5000 ten thousand yuan. Specifically, the method comprises the following steps:

1. based on the parting and blocking optimization, the optimization scheme reduces the welding work amount and facilitates the site construction; the symmetrical structure is optimized, so that the control of welding deformation is facilitated; the implementation of mechanical welding is facilitated; the field splicing welding seams are reduced, and the field butt welding seams of the reinforced nodes are reduced by 56%; the splicing welding seams of the bottom plate are reduced by about 75m, the construction quality of the bottom plate can be improved by reducing the welding seams, the welder resources are saved, and the nondestructive testing engineering quantity is reduced.

2. The utility model provides a splicing platform, splicing platform contains support frame and tiling steel sheet two parts, and the bottom is shaped steel support, and upper portion is 25mm steel sheet full shop, and whole platform is circularly, and the diameter is 44.2m, reserves certain clearance between the on-the-spot welding seam position platform steel sheet, and the operating personnel of being convenient for pastes ceramic lining and welding seam nondestructive test from the below. The height of the upper surface of the assembly platform from the ground is 1625mm. The assembling platform is convenient for personnel to assemble and operate, and the assembling flatness of the whole bottom plate is guaranteed.

3. The MAG automatic welding method based on laser intelligent tracking is researched and developed and is applied to assembling of nuclear power steel lining bottom plate modules, the welding yield of the bottom plate reaches 100%, the welding deformation meets the design requirement, and nuclear-grade welder resources are greatly saved.

4. The bottom plate and the first transition sections around the bottom plate are welded into a whole in a prefabricating workshop by adopting submerged arc welding, so that the arc welding of a welding rod of an annular welding seam on site is avoided, and the resources of welders are saved.

5. The bottom plate and the first transition sections on the periphery are welded into a whole, and only 8 on-site splicing welding seams of the first transition sections are formed, so that 10 butt welding seams are reduced, and the welding quality and deformation control of the nodes are better enhanced.

6. The foundation treatment workload is less, the support platform can be repeatedly used, the soil does not need to be refilled, and the soil does not need to be dug again after the completion.

Drawings

FIG. 1 is a schematic structural view of a steel lined floor and frustum modular structure;

FIG. 2 is a schematic view of a part of the structure of a steel lining bottom plate and a frustum modular structure and a construction tool matched with the frustum modular structure;

FIG. 3 is a schematic illustration of the construction of a first transition section;

FIG. 4 is a schematic structural view of a second transition section;

FIG. 5 is a schematic structural view of the third transition section 6;

FIG. 6 is a schematic perspective view of a modular structure, a construction platform and a construction tool;

FIG. 7 is a schematic plan view of a modular structure, a construction platform and a construction tool;

FIG. 8 is a numbered schematic view of the bottom plates of the central region circular bottom plate;

FIG. 9 is a schematic illustration of a patchwork (weld);

figure 10 is a schematic view of a central region circular floor element partition.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1-5, the present embodiment provides a steel lined bottom plate and frustum modular structure, which is a thin plate basin-like structure consisting of a central circular bottom plate 1, side wall plates 2 and a sloping ring plate 3.

The circular bottom plate 1 in the central area is of a horizontally arranged circular structure. The side wall plate 2 is an annular structure with a vertically arranged side wall. The inclined section ring plate 3 is an inclined plane ring structure with a side wall which is obliquely arranged outwards from bottom to top. The lower end of the side wall plate 2 is fixed with the periphery of the circular bottom plate 1 in the central area through a first transition section 4; the upper end of the side wall plate 2 is fixed with the lower end of the inclined section annular plate 3 through a second transition section 5. And a third transition section 6 is fixed at the upper opening of the oblique section ring plate 3 and is used for connecting other structures.

The central area circular bottom plate 1 is formed by splicing a plurality of bottom plates, and the bottom plates are divided into a rectangular bottom plate, a trapezoidal bottom plate and a bottom plate with an arc; a plurality of rectangular bottom plates are spliced into a rectangle and used as the central part of a circular bottom plate 1 in the central area; the plurality of trapezoidal bottom plates are assembled around the plurality of rectangular bottom plates and are assembled together with the plurality of rectangular bottom plates to form an octagon; the circular bottom plates with the circular arcs are assembled around the trapezoidal bottom plates and are assembled with the rectangular bottom plates and the trapezoidal bottom plates to form a circular bottom plate 1 in the center. The side wall plate 2 is formed by assembling a plurality of wall plates. The inclined section ring plate 3 is formed by assembling a plurality of inclined plates. The quantity of swash plate equals and the one-to-one correspondence with the quantity of wallboard, and the swash plate lower extreme is fixed through the upper end of second changeover portion 5 with corresponding wallboard.

Specifically, the central area circular bottom plate 1 is formed by assembling 24 bottom plates, namely 8 rectangular bottom plates, 8 trapezoidal bottom plates and 8 bottom plates with circular arcs, and all the bottom plates are assembled through welding. The side wall plate 2 is formed by assembling 12 wall plates, and all the wall plates are assembled into a whole by welding. The inclined section ring plate 3 is formed by splicing 12 inclined plates, and the inclined plates are spliced into a whole by welding.

Wherein, the outside welding of the wallboard of side wall panel 2 has hoop angle steel and vertical angle steel 21 as the stiffening rib. Radial angle steel 31 is welded on the inner side of the inclined plate of the inclined section ring plate 3.

Specifically, the bottom plate of the central region circular bottom plate 1 is a 6mm thick P265GH steel plate, and the diameter of the central region circular bottom plate 1 is 39.4m. The wall plate of the side wall plate 2 is a P265GH steel plate with the thickness of 6mm, the circumferential angle steel welded at the outer side is < 125 x 80 x 10 circumferential angle steel, and the vertical angle steel is < 75 x 50 x 8 vertical angle steel; the side wall panels 2 have a diameter of 39.4m and a height of 3.056m. The inclined plate of the inclined ring plate 3 has the thickness of P265GH of 6mm, the diameter of the inclined ring plate 3 is transited from 39.4m to 43.336m, the height difference is 190mm, and the width is 1850mm. The first transition section 4 and the second transition section 5 are both P265GH steel plates with the thickness of 30 mm; the third transition section 6 is a 22mm thick P265GH steel plate. The weight of the steel lined floor and frustum modular structure is up to 115t.

The construction method of the steel lining bottom plate and the frustum modular structure comprises the following steps:

firstly, building a splicing platform, as shown in fig. 6 and 7, wherein the splicing platform is used for splicing and building a steel lining bottom plate and a frustum modular structure; the splicing platform comprises a supporting frame at the bottom and a flat steel plate at the upper part; the supporting frame at the bottom is a section steel bracket and consists of an H300 multiplied by 10 multiplied by 15 high 1150 supporting column 71, an HW250 multiplied by 9 multiplied by 14 main beam 72, an HW200 multiplied by 8 multiplied by 12 secondary beam 73 and connecting supporting angle steel L100 multiplied by 10; the upper part of the steel plate is 25mm; the integral assembly platform is circular, the diameter of the integral assembly platform is 44.2m, and the height of the upper surface from the ground is 1625mm; gaps are reserved between the tiled steel plates at the positions, corresponding to the field welding seams, of the assembly platform, so that operators can conveniently paste the ceramic liners from the lower sides and perform nondestructive testing on the welding seams.

The concrete method for building the splicing platform comprises the following steps:

s1.1, cleaning a prefabricated site, selecting a reference elevation according to a terrain elevation, and positioning and paying off;

s1.2, pouring a concrete foundation and installing a top surface embedded part;

s1.3, positioning and paying off the axis position of a support column, measuring the height of an embedded part on the top surface of a foundation, mounting the support column 71 by taking the highest point as a reference, and welding the lower end of the support column 71 with the embedded part;

s1.4, checking the top surface elevation and the flatness of the supporting column 71;

s1.5, after the elevation is qualified, erecting a main beam 72 on the supporting column 71, and connecting the main beam 72 with the top of the supporting column through a bolt; the secondary beams 73 are erected on the main beams 72 and connected through bolts, the secondary beams 73 are connected through angle steel, and the top surface elevation is the same as that of the secondary beams 73 and connected through welding;

s1.6, paying off, paving and paving a steel plate: paying off the laying position of the flat steel plate; laying flat steel plates, and reserving a gap of 150-200 mm at the seam splicing position of the circular bottom plate 1 in the central area.

And confirming that the steel lining module assembling field is constructed according to the requirements, and meeting the space required by module assembling. The assembly platform is installed and organized to be qualified.

After the assembly platform is installed, a layer of fireproof cloth is laid on the assembly platform, the axis and the elevation are guided to the assembly platform through the nuclear island measurement control net, the overall dimension, the axis, the elevation and the like of the assembly platform are checked, and the procedure handover procedure is handled after the acceptance check is qualified. And after the illumination and the passage of the construction area meet the construction requirements, the operation can be started. A layer of fireproof cloth is laid on the flat steel plates, so that the modular structural members can be prevented from being adhered to the assembly platform.

The splicing platform is designed by taking unit modules as a design idea, and is divided into a square module unit at the center, a trapezoidal module unit and a peripheral module unit with radian, and the positions of splicing seams of a steel lining bottom plate on site are arranged among the units and used for setting welding tools, attaching ceramic liners, RT-ray shooting and the like.

The assembly platform can be used for reducing the earthwork backfill amount of the concrete construction operation platform in a large range, meanwhile, the assembly platform unit module assembly type construction is adopted to reduce the requirement on the construction period of a main key line, the disassembly is convenient, the cyclic utilization can be realized, and the use of other units is convenient.

And a second step of manufacturing a first transition section 4, a second transition section 5 and a third transition section 6.

The manufacturing methods of the first transition section 4, the second transition section 5 and the third transition section 6 are as follows: material receiving, paying off, cutting and blanking, identification transplanting, bending and forming, beveling machine processing, bending and forming, stress relief heat treatment, splicing beveling processing, splicing beveling inspection, splicing assembly, welding, deformation correction, nondestructive testing, size inspection and numbering and storing;

prefabricating and installing the first transition section 4 and the second transition section 5, processing by adopting a bending machine with a 30mm plate bending requirement, and blanking a steel plate into a long strip shape; bending the L-shaped steel into L-shaped steel by using a bending machine; milling two sides of the L-shaped steel into corresponding transition areas by adopting a milling machine, rolling the L-shaped steel into corresponding arcs by using arc rolling equipment, performing stress relief heat treatment on the bending areas, and assembling the L-shaped steel into a circular ring by welding; positioning according to the paying-off position;

prefabricating and installing the third transition section 6, processing by adopting a bending machine with a bending requirement of a 22mm plate, and blanking a steel plate into a long strip shape; bending the L-shaped steel into L-shaped steel by using a bending machine; milling two sides of the L-shaped steel by a milling machine to form corresponding transition areas, rolling the L-shaped steel into corresponding arcs by arc rolling equipment, performing stress relief heat treatment on the bending areas, and assembling the L-shaped steel into a circular ring by welding; and carrying out positioning according to the paying-off position.

And thirdly, manufacturing a bottom plate of the circular bottom plate 1 in the central area. The reference numerals for the various floors of the central area circular floor 1 are shown in figure 8.

The manufacturing process of the rectangular bottom plate and the trapezoidal bottom plate (4-11, 13-16, 19, 20, 22 and 23) comprises the following steps: material receiving, material discharging, splicing plate assembly, welding, correction, nondestructive testing, secondary cutting, dimension inspection and numbering storage. The manufacturing process of the bottom plate with the circular arc (1-3, 12, 17, 18, 21, 24) comprises the following steps: the method comprises the following steps of material receiving, blanking, splicing plate assembly, welding, correction, nondestructive testing, secondary cutting, size inspection, assembly with a first transition section 4, welding, correction, nondestructive testing, size inspection and numbering storage.

Allowance not less than 25mm is reserved on the length of the arc-shaped bottom plates (1-3, 12, 17, 18, 21 and 24), allowance not less than 10mm is reserved in the length and width directions after the assembly welding of each trapezoid bottom plate (4, 5, 8, 13, 22, 23, 11 and 16), and the allowance ends are all in the direction close to the outer side wall plate 2.

And fourthly, manufacturing the wall plate of the side wall plate 2. The reference numerals for the wall panels in the side wall panels 2 and the swash plates in the swash plate segment ring plates 3 are shown in fig. 9.

The manufacturing method of the assembled side wall plate 2 comprises the following steps: material getting, blanking, assembling of splicing plates, welding, correction, nondestructive testing, secondary cutting, dimension inspection, paying off of positions of a penetrating piece and a stiffening rib (if any), inspection, fixing and forming of the splicing plates on a moulding bed, assembling of stiffening rib angle steel and a wall plate, inspection, pressing of an I-shaped steel beam on the wall plate, welding of the stiffening rib angle steel and the wall plate, correction, nondestructive testing, positioning of a connecting piece, welding of the connecting piece, inspection of the whole dimension, welding and acceptance of a screw rod of a walkway platform (if any), sand blasting and painting, and numbering and storing.

And fifthly, manufacturing the inclined plate of the inclined section ring plate 3.

The manufacturing method of the inclined plate for assembling the inclined section ring plate 3 comprises the following steps: material receiving, material discharging, mark transplanting, splicing plate assembly, welding, correction, nondestructive testing, assembly with a second transition section 5, welding, correction, nondestructive testing, size inspection, sand blasting and painting, and numbering and storing.

The length direction of the inclined plate is increased by not less than 30 mm. And after the inclined plate and the 5 groups of second transition sections are welded, cutting off the allowance of S01b, 02b, 04b, 05b, 07b, 08b, 10b and 11b, and performing secondary cutting during the on-site group assembly of the allowance of S03b, 06b, 09b and 12b to ensure that the overall dimension meets the design requirement.

And sixthly, measuring the central coordinate, the cross center line, the angle line and the radius of the circular bottom plate in the central area by a measurer, taking the cross center line as an absolute coordinate, and releasing the assembling positioning line of the circular bottom plate in the central area and the axes of 0 degree, 90 degrees, 180 degrees and 270 degrees.

And the bottom plate is transported to the air near the assembly field from the workshop by a flat car, and then is transported and hoisted in place by using a truck crane. Selecting the northeast side and the west side of the assembling platform at the truck crane station; and an 85-ton truck crane is adopted, and the maximum hoisting radius of hoisted objects is 30m, so that the requirement on the construction performance of a crane is met.

Assembling the circular bottom plate 1 in the central area according to an assembling line, assembling the circular bottom plate by 24 bottom plates, and welding the circular bottom plates according to 5 units as shown in figure 10.

The specific assembling process of the circular bottom plate in the central area comprises the following steps: hoisting a bottom plate positioned at the center in place, carrying out field assembly on the bottom plate positioned at the center, setting a balancing weight and a welding tool, carrying out field welding on the bottom plate positioned at the center, carrying out nondestructive testing, cutting allowance, carrying out in-place positioning on the bottom plate positioned at the periphery, carrying out field assembly on the bottom plate positioned at the periphery, setting a balancing weight and a welding tool, carrying out field welding on the bottom plate positioned at the periphery, carrying out nondestructive testing, and carrying out overall dimension inspection.

And after the bottom plates are in place, the gap between the bottom plates is adjusted by using the chain block, and after the adjustment is finished, the adjacent bottom plates are assembled and fixed.

The assembling and welding of the circular bottom plate in the central area are carried out in units, the assembling and welding of No. 4, 5, 6 and 7 bottom plates are units 1, 9, 10, 14 and 15 bottom plates are units 2, 19, 20, 22 and 23 bottom plates are units 3,8, the assembling and welding of No. 13 bottom plates are units 4, the assembling and welding of No. 11 and 16 bottom plates are units 5, and the assembling and welding of the units are carried out after the assembling of the units is finished. And 4, 5, 11, 16, 22, 23, 8 and 13 are measured for the second time, and the cutting allowance is 30-50 mm in the length direction of the outer circular bottom plate for adjusting cutting during field assembly.

For the tailor welding of the unit 1, the unit 2 and the unit 3, a short welding line is welded firstly, and then a long welding line is welded, and when the short welding line is welded, the bottoming and the cover surface of one welding line are continuously welded towards the unit boundary from the unit center. The bottoming and capping of the long weld joint are performed in two sections, and welding is performed from a position close to the center of the weld joint to two ends. The tailor welding of the unit 4 and the unit 5 is carried out according to the requirement of the short welding seam, and the tailor welding between the units is carried out according to the requirement of the long welding seam.

After 8 pieces of bottom plates with circular arcs (including a first transition section) are assembled and the welding of the splicing seams between the sections of the first transition section is completed, the allowance of the outer edge of the bottom plate positioned in the center is cut, and the bottom plates with the circular arcs, the bottom plates positioned in the center, 8 shrinkage joints and the lengths of about 1m of the left side and the right side of the bottom plates are assembled temporarily. And after the assembly is finished, welding the octagonal welding line by adopting automatic welding equipment. During welding, the priming is carried out from the position close to the middle of the welding seam in two sections towards the two ends of the welding seam, and the cover surface can be selected to be welded in sections or continuously welded towards one direction according to the number of the tracks.

After welding, 8 shrinkage joints and the left and right residual welding joints are assembled. After the assembly is completed, the shrinkage joint is welded by adopting MAG automatic welding, the rest welding seams on the left side and the right side of the shrinkage joint are welded by adopting MAG automatic welding, and each welding seam is welded outwards from the intersection of the Y-shaped welding seams, so that the welding stress is prevented from being concentrated at the intersection of the welding seams to cause larger welding deformation.

Before the bottom plate welding, adopt square steel sheet counter weight evenly to arrange in the welding seam both sides, steel sheet center department adopts shaped steel counter weight evenly distributed as required, and quantity and size are according to actual conditions adjustment. The setting of balancing weight can not increase the welding degree of difficulty of welding seam, avoids reducing the space of welding, hinders welder's habitual operation and welding machine locating position etc.. One welding line can be formed by spot welding one or more (rigid connection between roots) section steels on the lower surfaces of all U-shaped irons along the length direction of the welding line, so that the structural rigidity is improved, and the wave deformation of the welding line is further reduced.

The seventh step: assembling the side wall plate 2: assembling 12 wall plates, arranging H300 multiplied by 30 buttress columns 74 on the outer sides of the head parts at two ends of each wall plate, adjusting the verticality and the radius by the buttress columns 74, welding 11 seams after the radius and the verticality are qualified, welding the other 1 seam at last, reserving a margin not less than 30mm (field cutting) at an upper opening, ensuring positive deviation during blanking, and increasing margins not less than 100mm for length direction plates S05c and S12c respectively; and carrying out secondary cutting during field assembly to ensure that the whole size meets the design requirement.

The concrete assembling process of the side wall plate 2 comprises the following steps: the method comprises the steps of on-site measurement and setting-up-setting of a buttress column-hoisting of a wallboard in place-inserting of a gap plate, a glasses plate and a taper pin after adjustment and positioning-platform installation of a longitudinal seam-longitudinal seam assembly-longitudinal seam welding, nondestructive testing-circular seam assembly-circular seam welding, nondestructive testing-cutting of shrinkage longitudinal seam allowance-shrinkage longitudinal seam and residual circular seam welding-connection angle steel installation and connection piece welding-on-site paint repair-installation of an upper walkway plate.

Specifically, the side wall plate is positioned at an elevation of-8.071 m. And (4) releasing a positioning angle line of the lower opening of the side wall plate on the first transition section of the circular bottom plate in the central area, and marking the number of the prefabricated part marked by the drawing at a corresponding position.

The inclined strut angle steel is added on two sides or one side of the buttress column through the buttress column fixing, the wall plate in place and the wallboard verticality adjusting; the buttress columns are made of HW300 section steel and are totally provided with 24 buttress columns, and 2 buttress columns are positioned at two ends of each wallboard and are about 200mm away from the steel plate.

The construction operation platform is respectively hung on the inner side and the outer side of the side wall plate, and before the wall plate is hoisted, the inner side walkway plate is well installed, so that the wall plate can be conveniently in place for operation. And after all the wall plates are hoisted in place, installing the outer side walkway plates. The outer platform is hung on the circumferential angle Ll 25X 80X 10 of the upper opening of the wall plate, and the inner platform is fixed on the welded bolt.

And spot welding positioning backup plates on the first transition section, and using wedge irons among the backup plates to adjust and fix the wall plate.

Hoisting adopts a method that phi 1.6 multiplied by 25m steel wire flies are adopted, 8 multiplied by 3.2t chains are matched with a chain block to hoist the wall plate, the state of the cylinder wall plate is adjusted through the chain block, and phi 15 steel wire ropes are used for secondary anti-falling at the chain block. Utilize hoist and mount Kong Guashe 2 chains that arc angle steel seted up on the board outside, use the snap ring to connect: the inner side of the plate is connected by 2 steel wire ropes, a chain block and a chain in a matching way, the bottom of the plate is connected and thrown on an attached bolt of the operation platform by angle steel and a snap ring, and the maximum single weight of the wall plate is 2.79 t.

The constructor operates the chain block to adjust the verticality of the wall plate, adjusts the gap misalignment between the wall plates by using a delta =3mm gap plate, a taper pin and phi 10 round steel, and fixes the wall plate at the same time.

The verticality of the wall plate in the installation process is detected by using a total station to be erected on a nuclear island control point and then measuring the radius.

The wallboard group corresponds with the wallboard and fixes a position one by one when hoist and mount, at the group in-process, should adjust the straightness that hangs down of suitable reading and the circumferential weld of suitable reading simultaneously, only can fix adjacent board after both accord with the requirement, wallboard S05c and S12c all leave the surplus, carry out radius adjustment cutting surplus after the group reaches S05c, the group reaches other longitudinal joints such as the complete welding of last version S12c back, the group is cut the group and is welded after checking the suitable reading girth. And after the longitudinal joints are assembled, assembling and spot-welding the adjusted circular joints on the lower side of the wall plate.

And after each wallboard is installed in place, a longitudinal seam welding platform is installed or a quick-mounting scaffold is arranged.

And performing spot welding and welding by qualified welders, adjusting the thickness of a positioning welding seam to be not more than 5mm, the length of the welding seam to be 10-20 mm and the interval to be l 00-200 mm according to requirements. And in formal welding, welding is carried out according to the parameters specified in the welding process card. The backup plate is adopted for rigid fixation, and welding is carried out according to the following welding sequence: the method comprises the following steps: welding 11 longitudinal joints except the contraction joint, and performing sectional desoldering from top to bottom during welding, wherein the length of each section is not more than 500mm; step two: and (3) welding the circular seams, starting from the circular seam opposite to the shrinkage seam, uniformly distributing the circular seams on the circumference, taking the circular seams as the center, and simultaneously performing symmetrical segmented back welding in the same direction to two sides, wherein the length of each segment is not more than 500mm. Step three: and (4) performing girth welding to the position of about 1.5m of the two sides of the contraction joint, lofting, cutting the allowance of the contraction joint, and reserving the girth joint and the contraction joint for welding. Step four: and after the nondestructive testing of the welding line is qualified, assembling and welding the connecting angle steel.

Eighth step: assembling an inclined section ring plate 3: the inclined section ring plate 3 is assembled by 12 inclined plates, and 48 inclined supports 75 are arranged. When the inclined section annular plate 3 is installed, a section steel column is arranged below the inclined section annular plate and serves as an inclined plate supporting column 76 for supporting the inclined section annular plate 3 and adjusting the elevation of the inclined section annular plate.

The concrete assembling process of the inclined section ring plate 3 is as follows: the method comprises the steps of on-site measurement and paying off, inclined plate support column setting, inclined plate hoisting in place, gap plate inserting after adjustment and positioning, glasses plate, taper pin and elevation adjustment plate longitudinal seam assembly, longitudinal seam welding, nondestructive testing, circular seam assembly, circular seam welding, nondestructive testing, shrinkage longitudinal seam allowance cutting, shrinkage longitudinal seam and residual circular seam welding, nondestructive testing and overall dimension inspection.

Specifically, the positioning elevation of the inclined section ring plate is-5.19 m. And (4) paying out the positioning angle money of the lower opening of the inclined section ring plate on the wall plate, and marking the number of the prefabricated part marked by the drawing at the corresponding position.

The inclined plate of the inclined section ring plate is provided with temporary radial angle steel 75 multiplied by 50 multiplied by 8 in a workshop and is arranged inside the inclined plate. The interval is 1.5 m-2.0 m, the distance is 1m from the end part, and a single hoisting point is arranged.

Before the inclined section ring plates are hoisted, 48 inclined plate supporting columns are arranged on the assembling tool, 4 inclined section supporting columns are uniformly arranged below each inclined section, the distance between each inclined section supporting column and the side wall plate is about 1500mm, inclined struts are arranged, and finally the elevation of the upper opening of each inclined plate supporting column is adjusted, so that a third transition section with the elevation of-5.00 m is arranged on each inclined plate supporting column, and the elevation of the upper opening of the third transition section meets the drawing requirements at the same time.

Hoisting the inclined plate of the inclined section ring plate is carried out by using a method of matching 4 chains 8 multiplied by 3.2t with a chain block, and the in-place angle of the inclined plate is adjusted by the chain block; wherein 2 chains are hung on the upper opening at the outer side of the inclined plate through a clamping ring and annularly arranged on the angle steel hoisting hole; the remaining 2 chains are hung at the bottom of the inclined plate through 2t inverted chains and steel plate clamps, phi 15 steel wire ropes are used as anti-falling ropes at the inverted chains, the steel wire ropes are connected with the chains and the lower steel plate clamps through snap rings, angle protectors are additionally arranged between the steel plate clamps and the inclined plate, the S12b adjacent inclined plate is taken as a starting point, the inclined plate is hoisted in place once in the anticlockwise direction or the clockwise direction, when the inclined plate is installed to the S05b, a total station is used for measuring the radius of a third transition section at the upper opening of the installed inclined plate, the S05b allowance is cut after adjustment, the upper perimeter and the elevation are measured again when the inclined plate is installed to the S12b, the S12b allowance is cut after the requirement is met, and the maximum unit weight is 2.52t.

Wherein, the circular bottom plate 1 in the central area adopts an MAG automatic welding method by intelligent laser tracking and a ceramic liner single-side welding double-side forming efficient welding process; the width of the butt weld is 5-8 mm; the short weld joint welding is continuously welded from the center of the unit to the boundary of the unit; long weld seam welding is carried out from the center of the weld seam in a subsection mode towards the two ends of the weld seam; the back of the bottom plate adopts a ceramic liner as a non-permanent liner to force the back weld joint to form, so that the construction of single-side welding and double-side forming welding of the steel liner is realized, the center line of the liner is ensured to be aligned with the center line of the weld joint when the ceramic liner is pasted, and the aluminum foil tape is ensured to be fixed firmly;

the side wall plate 2 adopts a laser tracking MAG automatic welding method, a ceramic liner is used as a non-permanent liner, and a welding seam deposited metal is supported during welding to force the back welding seam to be formed, so that the single-side welding and double-side forming of the welding seam are realized; three procedures of priming, interlayer cleaning and cover surface are carried out in the welding process, and the welding wire can realize continuous welding; the welding takes the wall plate between the two contraction joints as the center, one half of the welding line is welded along the clockwise direction, and the other half is welded along the anticlockwise direction; the transverse seam is continuously welded along the clockwise direction at a section which is far away from the shrinkage seam of the vertical seam;

and the oblique section ring plate 3 is welded on the wall plate 2 on the same side by adopting an MAG automatic welding method through laser tracking.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by replacing or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a steel lining bottom plate and frustum modular structure which characterized in that:

the modular structure is a thin plate basin-shaped structure consisting of a central area circular bottom plate, side wall plates and inclined section ring plates;

the circular bottom plate of the central area is of a horizontally arranged circular structure;

the side wall plate is of an annular structure with a vertically arranged side wall;

the inclined section ring plate is an inclined plane ring structure with a side wall which is obliquely arranged outwards from bottom to top;

the lower end of the side wall plate is fixed with the periphery of the circular bottom plate of the central area through a first transition section; the upper end of the side wall plate is fixed with the lower end of the inclined section annular plate through a second transition section;

the central area circular bottom plate is formed by splicing a plurality of bottom plates, and the bottom plates are divided into a rectangular bottom plate, a trapezoidal bottom plate and a bottom plate with an arc; a plurality of rectangular bottom plates are spliced into a rectangle and used as the central part of the circular bottom plate in the central area; the plurality of trapezoidal bottom plates are assembled around the plurality of rectangular bottom plates and assembled together with the plurality of rectangular bottom plates to form an octagon; the plurality of bottom plates with circular arcs are spliced around the plurality of trapezoidal bottom plates, and are spliced with the plurality of rectangular bottom plates and the plurality of trapezoidal bottom plates to form a circular bottom plate with a central area;

the side wall plates are formed by splicing a plurality of wall plates; the inclined section ring plate is formed by splicing a plurality of inclined plates; the quantity of swash plate equals and the one-to-one correspondence with the quantity of wallboard, and the swash plate lower extreme is fixed through the upper end of second changeover portion with corresponding wallboard.

2. The steel lined floor and frustum modular structure of claim 1, wherein:

the central area circular bottom plate is formed by splicing 24 bottom plates, namely 8 rectangular bottom plates, 8 trapezoidal bottom plates and 8 bottom plates with circular arcs, and all the bottom plates are spliced by welding;

the side wall plates are formed by splicing 12 wall plates, and all the wall plates are spliced into a whole by welding;

the inclined section ring plate is formed by splicing 12 inclined plates, and the inclined plates are spliced into a whole by welding.

3. The steel lined floor and frustum modular structure of claim 2, wherein:

and annular angle steel and vertical angle steel are welded on the outer side of the wall plate of the side wall plate.

4. The steel lined floor and frustum modular structure of claim 3, wherein:

and radial angle steel is welded on the inner side of the inclined plate of the inclined section ring plate.

5. The steel lined floor and frustum modular structure of claim 4, wherein:

and a third transition section is fixed at the upper opening of the inclined section ring plate.

6. The construction method of the steel-lined bottom plate and the frustum modular structure as set forth in claim 5, wherein:

the method comprises the following steps:

firstly, building an assembly platform; the assembly platform comprises a support frame at the bottom and a flat steel plate at the upper part, and the whole assembly platform is circular; gaps are reserved among the tiled steel plates at the positions, corresponding to the field welding seams, of the splicing platforms;

secondly, manufacturing a first transition section, a second transition section and a third transition section;

thirdly, manufacturing a bottom plate of the circular bottom plate in the central area;

fourthly, manufacturing a wall plate of the side wall plate;

fifthly, manufacturing an inclined plate of the inclined section ring plate;

sixthly, assembling the circular bottom plate in the central area according to an assembling line, and assembling the circular bottom plate into 24 bottom plates;

the concrete assembling process of the circular bottom plate in the central area comprises the following steps: hoisting a bottom plate positioned in the center in place, assembling the bottom plate positioned in the center on site, arranging a balancing weight and a welding tool, welding the bottom plate positioned in the center on site, carrying out nondestructive testing, cutting allowance, positioning the bottom plate positioned on the periphery, assembling the bottom plate positioned on the periphery on site, arranging a balancing weight and a welding tool, welding the bottom plate positioned on the periphery on site, carrying out nondestructive testing, and carrying out overall dimension inspection;

the seventh step: assembling the side wall plates: assembling 12 wall plates, arranging buttress columns at the outer sides of the head parts at two ends of each wall plate, adjusting the verticality and the radius by the buttress columns, welding 11 seams after the radius and the verticality are qualified, welding the other 1 seam at last, reserving a margin not less than 30mm at an upper opening, and ensuring positive deviation during blanking; performing secondary cutting during field assembly to ensure that the overall size meets the design requirement;

the concrete assembling process of the side wall plate comprises the following steps: the method comprises the following steps of on-site measurement and setting-up-setting of a buttress column-hoisting of a wall plate in place-inserting of a gap plate, a glasses plate and a taper pin after adjustment and positioning-platform installation of a longitudinal seam-longitudinal seam assembly-longitudinal seam welding, nondestructive testing-circular seam assembly-circular seam welding, nondestructive testing-cutting of shrinkage longitudinal seam allowance-shrinkage longitudinal seam and residual circular seam welding-connection angle steel installation and connection piece welding-on-site paint repair-installation of an upper walkway plate;

eighth step: assembling an inclined section ring plate: assembling by 12 inclined plates, and arranging 48 inclined supports;

the concrete assembling process of the inclined section ring plate comprises the following steps: the method comprises the steps of on-site measurement and paying off, inclined plate support column setting, inclined plate hoisting in place, gap plate inserting after adjustment and positioning, glasses plate, taper pin and elevation adjustment plate longitudinal seam assembly, longitudinal seam welding, nondestructive testing, circular seam assembly, circular seam welding, nondestructive testing, shrinkage longitudinal seam allowance cutting, shrinkage longitudinal seam and residual circular seam welding, nondestructive testing and overall dimension inspection.

7. The method of constructing a steel lined floor and frustum modular structure as claimed in claim 6, wherein:

in the first step, the concrete method for building the splicing platform comprises the following steps:

s1.1, cleaning a prefabricated site, selecting a reference elevation according to a terrain elevation, and positioning and paying off;

s1.2, pouring a concrete foundation and installing a top surface embedded part;

s1.3, positioning and paying off the axis position of a support column, measuring the height of an embedded part on the top surface of a foundation, mounting the support column by taking the highest point as a reference, and welding the lower end of the support column with the embedded part;

s1.4, checking the top surface elevation and the flatness of the support column;

s1.5, after the elevation is qualified, erecting a main beam on the supporting column, and connecting the main beam with the top of the supporting column through a bolt; the secondary beams are erected on the main beams and connected through bolts, the secondary beams are connected through angle steel, and the top surface elevation is the same as the secondary beam elevation and connected through welding;

s1.6, paying off, paving and paving a steel plate: paying off the laying position of the flat steel plate; laying a flat steel plate, reserving a gap of 150-200 mm at the seam splicing position of the circular bottom plate in the central area, and laying a layer of fireproof cloth on the flat steel plate.

8. The construction method of the steel-lined bottom plate and the frustum modular structure as set forth in claim 6, wherein:

in the second step, the manufacturing methods of the first transition section, the second transition section and the third transition section are all as follows: material receiving, paying off, cutting and blanking, identification transplanting, bending and forming, beveling machine processing, bending and forming, stress relief heat treatment, splicing beveling processing, splicing beveling inspection, splicing assembly, welding, deformation correction, nondestructive testing, size inspection and numbering and storing;

prefabricating and installing the first transition section and the second transition section, processing by adopting a bending machine with a 30mm plate bending requirement, and blanking a steel plate into a long strip shape; bending into L-shaped steel by using a bending machine; milling two sides of the L-shaped steel into corresponding transition areas by adopting a milling machine, rolling the L-shaped steel into corresponding arcs by using arc rolling equipment, performing stress relief heat treatment on the bending areas, and assembling the L-shaped steel into a circular ring by welding; positioning according to the paying-off position;

prefabricating and installing a third transition section, namely processing the third transition section by adopting a bending machine with a bending requirement of a 22mm plate, and blanking a steel plate into a long strip shape; bending into L-shaped steel by using a bending machine; milling two sides of the L-shaped steel by a milling machine to form corresponding transition areas, rolling the L-shaped steel into corresponding arcs by arc rolling equipment, performing stress relief heat treatment on the bending areas, and assembling the L-shaped steel into a circular ring by welding; and carrying out positioning according to the pay-off position.

9. The method of constructing a steel lined floor and frustum modular structure as claimed in claim 6, wherein:

in the third step, the manufacturing process of the rectangular bottom plate and the trapezoidal bottom plate is as follows: material getting, material discharging, splicing plate assembly, welding, correction, nondestructive testing, secondary cutting, dimension inspection and numbering storage;

the manufacturing process of the bottom plate with the circular arc comprises the following steps: material getting, material blanking, splicing plate assembly, welding, correction, nondestructive testing, secondary cutting, size inspection, assembly with a first transition section, welding, correction, nondestructive testing, size inspection and numbering storage;

reserving allowance not smaller than 25mm in length of the bottom plate with the arc, reserving allowance not smaller than 10mm in length and width directions after assembly welding of each trapezoid bottom plate is completed, and reserving allowance ends in the direction close to the outer side wall plate;

in the fourth step, the manufacturing method of the wall panel for assembling the side wall panel comprises the following steps: material getting, blanking, assembling of splicing plates, welding, correction, nondestructive testing, secondary cutting, dimension inspection, paying off of positions of a penetrating piece and a stiffening rib, inspection, fixing and forming of the splicing plates on a moulding bed, assembling of stiffening rib angle steel and a wall plate, inspection, pressing of an I-shaped steel beam on the wall plate, welding of the stiffening rib angle steel and the wall plate, correction, nondestructive testing, positioning of a connecting piece, welding of the connecting piece, inspection of the whole dimension, welding and acceptance of a screw rod of a walkway platform, sand blasting and painting, and numbering and storing;

in the fifth step, the manufacturing method of the inclined plate for assembling the inclined section ring plate comprises the following steps: material taking, material discharging, identification transplanting, splicing plate assembly, welding, correction, nondestructive testing, assembly with a second transition section, welding, correction, nondestructive testing, size inspection, sand blasting painting and numbering and storing;

the length direction of the inclined plate is increased by not less than 30 mm.

10. The construction method of the steel-lined bottom plate and the frustum modular structure as set forth in claim 6, wherein:

the circular bottom plate in the central area adopts an MAG automatic welding method by intelligent laser tracking and a ceramic liner single-side welding double-side forming efficient welding process; the width of the butt weld is 5-8 mm; the back of the bottom plate adopts a ceramic liner as a non-permanent liner to force the back weld joint to form, so that the construction of single-side welding and double-side forming welding of the steel liner is realized, the center line of the liner is ensured to be aligned with the center line of the weld joint when the ceramic liner is pasted, and the aluminum foil tape is ensured to be fixed firmly;

the side wall plate adopts a laser tracking MAG automatic welding method, a ceramic liner is used as a non-permanent liner, and a welding seam deposited metal is supported during welding to force the back welding seam to be formed, so that the single-side welding and double-side forming of the welding seam are realized; three procedures of priming, interlayer cleaning and capping are carried out in the welding process; the welding takes the wall plate between the two contraction joints as the center, one half of the welding line is welded along the clockwise direction, and the other half is welded along the anticlockwise direction; the transverse seam is continuously welded along the clockwise direction at a section which is far away from the shrinkage seam of the vertical seam;

and welding the inclined section ring plate and the wall plate on the same side by adopting a laser tracking MAG automatic welding method.

Images