Positioning and assembling construction method of special-shaped variable-diameter circular tube inclined truss steel structure

Abstract

The application relates to a positioning and assembling construction method of a special-shaped variable-diameter circular tube gabled truss steel structure, and relates to the field of steel structures. The positioning and assembling construction method of the special-shaped variable-diameter circular tube gabled truss steel structure cuts a plurality of triangular openings on the outer wall of the variable-diameter section of a circular tube in the circumferential direction, seals and welds the openings after heating the variable-diameter section of the circular tube to obtain a variable-diameter circular tube; a two-dimensional plan view of the variable-diameter circular tube gabled truss is output, the size and positioning nodes of the space distortion direction and the bending slope direction of each variable-diameter circular tube are displayed, and each variable-diameter circular tube and a part are positioned and spliced according to the two-dimensional plan view to obtain a variable-diameter circular tube gabled truss through welding; a splicing jig is arranged to sequentially position and fix each variable-diameter circular tube gabled truss on the splicing jig to perform pre-splicing welding. The positioning and assembling construction method of the special-shaped variable-diameter circular tube gabled truss steel structure can greatly reduce material waste and construction cost and shorten the construction period.

Description

TECHNICAL FIELD

[0001] The application relates to the field of steel structures, in particular to a positioning and assembling construction method of a special-shaped variable-diameter circular pipe gabled truss steel structure. BACKGROUND

[0002] The special-shaped steel truss structure is widely applied to engineering buildings due to high structural strength, light component weight and short construction period. In the special-shaped steel truss structure, a circular pipe needs to be processed into a variable-diameter circular pipe, and then several circular pipes with different diameters are connected to form a truss structure. The existing variable-diameter circular pipe processing method generally comprises the following steps: after a main body is cut, the main body is pre-bent on both sides by a pressing device to process several pipe barrels with different diameters, and then the pipe barrels are butted together. The mold cost is high and the construction period is long. In addition, the conventional steel truss structures currently produced all have corresponding symmetry and consistent material sizes, and the positioning in the production process is simple. However, when the steel truss structure used has a special-shaped structure integrating variable-diameter, bending and spatial distortion, the problems of variable-diameter splicing, spatial distortion, intersecting line welds, splicing welds, three-dimensional positioning and assembling of components, assembling, adjusting and positioning of the jig, and the like, which exist in the truss production process, will greatly increase the construction difficulty, further prolong the construction period and increase the construction cost. SUMMARY

[0003] The application aims to provide a positioning and assembling construction method of a special-shaped variable-diameter circular pipe gabled truss steel structure, which can greatly reduce material waste and construction cost and shorten the construction period.

[0004] The application is implemented in the following manner:

[0005] The application provides a positioning and assembling construction method of a special-shaped variable-diameter circular pipe gabled truss steel structure, which comprises the following steps:

[0006] The circumferences of a large-diameter end and a small-diameter end of both ends of a variable-diameter section of a circular pipe are calculated, a plurality of triangular openings are formed by cutting the outer wall of the variable-diameter section of the circular pipe in the circumferential direction, the sum of the lengths of the ends of the openings in the circumferential direction is equal to the difference between the circumferences of the large-diameter end and the small-diameter end, the variable-diameter section of the circular pipe is heated, and the openings are closed and welded to obtain a variable-diameter circular pipe;

[0007] A two-dimensional plan view of the variable-diameter circular pipe gabled truss is output, the size and positioning node of the spatial distortion direction and the bending slope direction of each variable-diameter circular pipe are displayed, and each variable-diameter circular pipe and a part are positioned and spliced according to the two-dimensional plan view, and then welded to obtain a variable-diameter circular pipe gabled truss;

[0008] The assembling jig is arranged, each variable-diameter circular pipe gabled truss is sequentially positioned and fixed on the assembling jig for pre-assembling, and the variable-diameter circular pipe gabled trusses are welded to obtain a special-shaped variable-diameter circular pipe gabled truss steel structure.

[0009] In some alternative embodiments, after the variable-diameter section of the circular pipe is heated, the variable-diameter section is repeatedly heated, transition positioning members are arranged on the outer wall of the variable-diameter section to position the variable-diameter section, and a manual hoist is used to push the variable-diameter section to close the openings.

[0010] In some alternative embodiments, when the variable-diameter circular pipe is welded, after the openings are beveled, welding is performed using a flux-cored wire after the openings are cleaned, and after the welding is completed and the weld is detected to be qualified, the equal-strength weld is polished to be flat to form a seamless joint.

[0011] In some alternative embodiments, when the variable-diameter circular pipe is positioned according to a two-dimensional plan view to obtain the variable-diameter circular pipe truss, the dimensions of each spatial twist and bending position of the variable-diameter circular pipe are positioned, the outer side of the spatial twist and bending position is heated, a manual hoist is used to apply a pressure and tension force to the spatial twist and bending position, and a baffle and an arc guide plate are arranged at the spatial twist and bending position to position the spatial twist and bending position, and then the spatial twist and bending position is spot-welded to prevent rebounding.

[0012] In some alternative embodiments, when the variable-diameter circular pipe is positioned and jointed according to a two-dimensional plan view to obtain the variable-diameter circular pipe truss, the diagonal line size of the variable-diameter circular pipe truss is reviewed, and when the error is within the allowable range, the variable-diameter circular pipe truss is welded.

[0013] In some alternative embodiments, when the assembly jig is arranged, the elevation of each support point on the assembly jig and the axis distance of each support point are measured to position the assembly jig, and according to the different heights of the corbel positions of the variable-diameter circular pipe truss, corbel positioning members are arranged on the assembly jig to position the assembly jig, and then the positioning distance between each assembly jig is determined according to the corbel positions.

[0014] In some alternative embodiments, when each variable-diameter circular pipe truss is sequentially positioned and fixed on the assembly jig for pre-assembly, first, a two-dimensional plan view is calculated through a three-dimensional model of the special variable-diameter circular pipe truss steel structure, a previous variable-diameter circular pipe truss is hoisted on the assembly jig, the positions of each center of gravity line of the previous variable-diameter circular pipe truss arranged at intervals along the length direction are measured and positioned with reference to the two-dimensional plan view, the size deviation of the previous variable-diameter circular pipe truss is reviewed, then a next variable-diameter circular pipe truss is hoisted, and the previous variable-diameter circular pipe truss and the next variable-diameter circular pipe truss are positioned with reference to the two-dimensional plan view according to the cross-sectional width distance of the previous variable-diameter circular pipe truss and the next variable-diameter circular pipe truss, and then the previous variable-diameter circular pipe truss and the next variable-diameter circular pipe truss are welded.

[0015] In some alternative embodiments, before the previous variable-diameter circular pipe truss and the next variable-diameter circular pipe truss are welded, the distance size of the diagonal line of the previous variable-diameter circular pipe truss and the next variable-diameter circular pipe truss is measured and positioned with reference to the two-dimensional plan view.

[0016] The beneficial effects of the present application are: the positioning and assembling construction method of the special-shaped variable-diameter circular tube gantree steel structure provided by the present application comprises the following steps: the circumferences of the large-diameter end and the small-diameter end of the variable-diameter section of the circular tube are calculated, a plurality of triangular openings are formed by cutting the outer wall of the variable-diameter section of the circular tube in the circumferential direction, the sum of the lengths of the ends of each opening in the circumferential direction is equal to the difference between the circumferences of the large-diameter end and the small-diameter end, the variable-diameter section of the circular tube is welded after being heated to close each opening; a two-dimensional plan view of the variable-diameter circular tube gantree is output, the size and positioning node of the spatial distortion direction and the bending inclination direction of each variable-diameter circular tube are displayed, and each variable-diameter circular tube and the parts are positioned and spliced according to the two-dimensional plan view, and then welded to obtain the variable-diameter circular tube gantree; a splicing jig is arranged, and each variable-diameter circular tube gantree is sequentially positioned and fixed on the splicing jig for pre-splicing, and the variable-diameter circular tube gantrees are welded to obtain the special-shaped variable-diameter circular tube gantree steel structure. The positioning and assembling construction method of the special-shaped variable-diameter circular tube gantree steel structure provided by the present application adopts the method of cutting the circular tube in equal parts and then heating and shrinking and welding to process the variable-diameter section of the circular tube, and utilizes the two-dimensional plan view for positioning to construct the spatial distortion direction and the bending inclination direction of the variable-diameter circular tube, which can greatly reduce material waste and construction cost, and shorten the construction period. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0018] Figure 1 The flowchart of the positioning and assembling construction method of the special-shaped variable-diameter circular tube gantree steel structure provided by the embodiments of the present application;

[0019] Figure 2 The structure diagram of the opening formed on the circular tube in the positioning and assembling construction method of the special-shaped variable-diameter circular tube gantree steel structure provided by the embodiments of the present application when it is expanded in the circumferential direction;

[0020] Figure 3 The structure diagram of the variable-diameter section obtained by heating and closing each opening and welding after the opening is formed on the circular tube in the positioning and assembling construction method of the special-shaped variable-diameter circular tube gantree steel structure provided by the embodiments of the present application;

[0021] Figure 4 The structure diagram of the spatial distortion and bending inclination of the variable-diameter circular tube of the variable-diameter circular tube gantree in the positioning and assembling construction method of the special-shaped variable-diameter circular tube gantree steel structure provided by the embodiments of the present application;

[0022] Figure 5The first segment of the local structure diagram for positioning the space twist and the bending part when processing the variable-diameter pipe of the variable-diameter pipe gabled frame in the positioning and assembling construction method of the variable-diameter pipe gabled frame steel structure of the special-shaped variable-diameter pipe gabled frame provided in the embodiments of the present application;

[0023] Figure 6 The second segment of the local structure diagram for positioning the space twist and the bending part when processing the variable-diameter pipe of the variable-diameter pipe gabled frame in the positioning and assembling construction method of the variable-diameter pipe gabled frame steel structure of the special-shaped variable-diameter pipe gabled frame provided in the embodiments of the present application;

[0024] Figure 7 The third segment of the local structure diagram for positioning the space twist and the bending part when processing the variable-diameter pipe of the variable-diameter pipe gabled frame in the positioning and assembling construction method of the variable-diameter pipe gabled frame steel structure of the special-shaped variable-diameter pipe gabled frame provided in the embodiments of the present application;

[0025] Figure 8 The structure diagram for checking the diagonal line size of the variable-diameter pipe gabled frame in the positioning and assembling construction method of the variable-diameter pipe gabled frame steel structure of the special-shaped variable-diameter pipe gabled frame provided in the embodiments of the present application;

[0026] Figure 9 The structure diagram for positioning by using the laser level to measure the elevation of each support point on the assembling jig frame and the distance between the axes of each support point in the positioning and assembling construction method of the variable-diameter pipe gabled frame steel structure of the special-shaped variable-diameter pipe gabled frame provided in the embodiments of the present application;

[0027] Figure 10 The structure diagram for positioning by using the laser level to measure the position of each gravity center line of the variable-diameter pipe gabled frame arranged along the length direction in the positioning and assembling construction method of the variable-diameter pipe gabled frame steel structure of the special-shaped variable-diameter pipe gabled frame provided in the embodiments of the present application;

[0028] Figure 11 The structure diagram for positioning according to the cross-sectional width distance reference plane two-dimensional graph of the front variable-diameter pipe gabled frame and the rear variable-diameter pipe gabled frame in the positioning and assembling construction method of the variable-diameter pipe gabled frame steel structure of the special-shaped variable-diameter pipe gabled frame provided in the embodiments of the present application;

[0029] Figure 12 The structure diagram for positioning according to the distance size reference plane two-dimensional graph of the diagonal line of the front variable-diameter pipe gabled frame and the rear variable-diameter pipe gabled frame in the positioning and assembling construction method of the variable-diameter pipe gabled frame steel structure of the special-shaped variable-diameter pipe gabled frame provided in the embodiments of the present application;

[0030] Figure 13 The structure diagram for pre-assembling and welding the two variable-diameter pipe gabled frames by using the laser level to observe the straightness in the positioning and assembling construction method of the variable-diameter pipe gabled frame steel structure of the special-shaped variable-diameter pipe gabled frame provided in the embodiments of the present application.

[0031] In the drawings: 100, round pipe; 110, opening; 120, transition positioning member; 130, hand hoist; 140, laser level positioning device; 150, center of gravity line; 160, bracket positioning member. DETAILED DESCRIPTION

[0032] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor fall within the scope of protection of the present application.

[0034] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0036] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the component must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0037] In the description of the present application, it is also necessary to explain that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0039] The features and performances of the positioning and assembling construction method of the special-shaped variable-diameter round pipe gable truss steel structure are further described in detail below in combination with the embodiments.

[0040] The positioning and assembling construction method of the special-shaped variable-diameter round pipe gable truss steel structure provided in the embodiments of the present application comprises the following steps:

[0041] Step one, lofting on the mold, checking the plane size, and starting the assembling process after checking that there is no error; as shown in Figure 1 As shown in

[0042] As shown in Figure 2 As shown in Figure 2 Because the transition distance of the variable-diameter section is not a smooth transition, the variable-diameter section of the round pipe 100 needs to be heated repeatedly using a flame, so that the variable-diameter section of the round pipe 100 is heated to 750-850℃, then the transition positioning member 120 is arranged on the outer wall of the variable-diameter section for positioning, and the manual hoist 130 is used to push the variable-diameter section to close and weld each opening 110. After the slope is opened in each opening 110, the welding is performed after the root is cleaned with flux-cored wire, and after the welding is completed, the weld is detected. After the weld detection is qualified, the equal-strength weld is polished flat to form a seamless splice to obtain a variable-diameter round pipe.

[0043] Step two, due to the space twist and bending slope of the variable diameter pipe of the variable diameter pipe inclined truss, it is not conducive to positioning and assembling in three-dimensional space, therefore, the two-dimensional plan of the variable diameter pipe inclined truss is output by computer, the size and positioning node of the space twist direction and bending slope direction of each variable diameter pipe are displayed on the two-dimensional plan, and then each variable diameter pipe and part are positioned, spliced and welded according to the two-dimensional plan to obtain the variable diameter pipe inclined truss;

[0044] Specifically, as shown in Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , the size of each space twist and bending part of the variable diameter pipe is positioned according to the CAD two-dimensional plan of the variable diameter pipe inclined truss, as A1, A1', A2, A2' in Figure 5 , and the upstream and downstream positions of the outer side of the space twist and bending part of the variable diameter pipe are heated to 750-850℃, the space twist and bending part of the variable diameter pipe is subjected to tension by using the manual hoist 130, and the stop plate and the arc guide plate are arranged at the space twist and bending part of the variable diameter pipe for positioning, when the space twist and bending part of the variable diameter pipe reaches the preset degree, spot welding is performed to prevent rebound, so as to ensure the stability of the slope and bending degree of the space twist and bending part of the variable diameter pipe, and then the assembly process of other parts of the variable diameter pipe inclined truss is performed according to lofting, and the welding size is checked after assembly, as shown in Figure 8 , and the diagonal line L d of the variable diameter pipe inclined truss is rechecked, and the variable diameter pipe inclined truss is welded when the error is within the allowable range.

[0045] Step three, the assembly jig is arranged, as shown in Figure 9 , the elevation of each support point on the assembly jig and the distance between the axes of each support point are measured and positioned by using the laser level positioning instrument 140, so as to ensure the flatness and external size of the variable diameter pipe inclined truss assembly, and the corbel positioning member 160 is arranged on the assembly jig according to the different heights of the corbel positions of the variable diameter pipe inclined truss for positioning, and then the positioning distance between each assembly jig is determined according to the corbel position of the variable diameter pipe inclined truss, so that the elevation positioning of the assembly jig takes the ground 1m as the reference zero point, since the reference surfaces of the landing points of each assembly jig of the variable diameter pipe inclined truss are different, the landing points of each assembly jig are sequentially lifted to the preset height by using the travelling crane and dropped to A1, A2, A3, A4 in Figure 5 , Figure 6 and Figure 7 .

[0046] The variable-diameter pipe gantree is positioned and fixed on the assembling jig in sequence for pre-assembling. First, a three-dimensional model of the variable-diameter pipe gantree is established by computer, and then a two-dimensional planar graph of the variable-diameter pipe gantree is calculated according to the three-dimensional model. Next, the previous variable-diameter pipe gantree is hoisted on the assembling jig, as shown in Figure 10 , and the position of each center line 150 of the previous variable-diameter pipe gantree arranged along the length direction is measured by the laser level positioning instrument 140 to position the two-dimensional planar graph. The size deviation and horizontal position deviation of the previous variable-diameter pipe gantree are checked, and the deviation is adjusted if any.

[0047] As shown in Figure 11 , the next variable-diameter pipe gantree is hoisted, and the cross-sectional width a, b of the previous variable-diameter pipe gantree and the next variable-diameter pipe gantree is positioned according to the two-dimensional planar graph, as shown in Figure 12 , and the distance size of the diagonal line L d of the previous variable-diameter pipe gantree and the next variable-diameter pipe gantree is measured to position the two-dimensional planar graph. When the positioning is completed, the node size of each node of the previous variable-diameter pipe gantree and the next variable-diameter pipe gantree is rechecked, as shown in Figure 13 , and the straightness is observed by the laser level positioning instrument 140. After the inspection is correct, the previous variable-diameter pipe gantree and the next variable-diameter pipe gantree are welded. Then, the two variable-diameter pipe gantrees are sequentially spliced and welded according to the above steps, and finally the variable-diameter pipe gantree steel structure is obtained by assembling.

[0048] The positioning and assembling construction method of the special-shaped variable-diameter circular tube gable frame steel structure provided by the embodiment of the application adopts a computer programmed control numerical control intersecting line cutting machine to perform equidivision circular cutting on the circular tube 100 to obtain a plurality of triangular openings 110, and then uses flame heat processing to weld the openings 110 of the circular tube 100 to obtain a variable-diameter circular tube, realizing seamless splicing of the variable-diameter section of the circular tube 100, greatly reducing material waste during processing, reducing construction cost, shortening construction period, and improving the efficiency and stability of welding work. Meanwhile, the two-dimensional plan of the variable-diameter circular tube gable frame is output by the computer, and the variable-diameter circular tube is bent by using flame heating and a hand-operated hoist, combined with the auxiliary positioning of the baffle and the arc plate, to solve the problem of difficult positioning and assembling of the variable-diameter circular tube gable frame caused by the spatial distortion and bending slope of the variable-diameter circular tube, ensure the stable positioning of the slope and spatial bending degree, significantly reduce the construction period of the variable-diameter circular tube gable frame, improve the assembling quality, finally use the method of three-dimensional space positioning to two-dimensional space positioning to position the positions of each variable-diameter circular tube gable frame, find out a plurality of different reference surface assembling jig positioning points and recheck the size to improve the position accuracy of the variable-diameter circular tube gable frame, simplify the complexity of three-dimensional space positioning, improve the accuracy of single assembling of the variable-diameter circular tube gable frame, ensure the quality of the overall structure, and reduce the assembling difficulty and time cost.

[0049] The embodiments described above are part of the embodiments of the application, rather than all the embodiments. The detailed description of the embodiments of the application is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the application.

Claims

1. A positioning and assembling construction method of a special-shaped variable-diameter circular tube inclined truss steel structure, characterized in that, The following steps are involved: The circumferences of the large-diameter end and the small-diameter end at both ends of the reduced-diameter section of the circular tube are calculated, and the outer wall of the reduced-diameter section of the circular tube is equally divided along the circumferential direction to form a plurality of triangular openings, wherein the sum of the circumferential lengths of the ends of the openings is equal to the difference in circumference between the large-diameter end and the small-diameter end. After heating the reduced-diameter section of the circular tube, the openings are closed and welded to obtain a reduced-diameter circular tube. Output a two-dimensional plan view of the variable diameter circular tube oblique truss, showing the dimensions and positioning nodes of each variable diameter circular tube in the spatial twisting direction and the bending slope direction; and position, splice, and weld each variable diameter circular tube and parts according to the two-dimensional plan view to obtain the variable diameter circular tube oblique truss; Arrange an assembly frame, position and fix each variable diameter circular tube oblique truss on the assembly frame in sequence for pre-assembly, and weld each variable diameter circular tube oblique truss to obtain a special-shaped variable diameter circular tube oblique truss steel structure.

2. The positioning and assembling construction method of the special-shaped variable-diameter circular tube oblique truss steel structure according to claim 1, characterized in that, When the reducing section of the round tube is heated and each opening is closed, the reducing section is heated repeatedly, a transition positioning piece is set on the outer wall of the reducing section for positioning, and a manual hoist is used to push the reducing section to close each opening.

3. The positioning and assembling construction method of the special-shaped variable-diameter circular tube oblique truss steel structure according to claim 1, characterized in that, When welding to obtain a reduced diameter circular tube, after a groove is opened at each opening, the root is cleaned with a flux-cored wire and then welded. After the welding is completed and the weld is inspected and qualified, the equal strength weld is polished and smoothed to form a seamless splicing.

4. The positioning and assembling construction method of the special-shaped variable-diameter circular tube oblique truss steel structure according to claim 1, characterized in that, When positioning each of the variable diameter circular tubes and parts according to the two-dimensional plan to obtain a variable diameter circular tube oblique truss, the dimensions of each spatial twisting and bending portion of the variable diameter circular tube are located, and the outer sides of the spatial twisting and bending portions are heated. A manual hoist is used to apply tension to the spatial twisting and bending portions, and baffles and arc-starting plates are set at the spatial twisting and bending portions for positioning. Subsequently, the spatial twisting and bending portions are spot welded to prevent rebound.

5. The positioning and assembling construction method of the special-shaped variable-diameter circular tube oblique truss steel structure according to claim 1, characterized in that, When positioning and splicing the various variable diameter circular tubes and parts according to the two-dimensional plan to obtain the variable diameter circular tube oblique truss, the diagonal dimensions of the variable diameter circular tube oblique truss are reviewed, and when the error is within the allowable range, the variable diameter circular tube oblique truss is welded to obtain the variable diameter circular tube oblique truss.

6. The positioning and assembling construction method of the special-shaped variable-diameter circular tube oblique truss steel structure according to claim 1, characterized in that, When arranging the assembly tire frame, the elevation of each support point on the assembly tire frame and the axial distance of each support point are measured for positioning, and according to the different heights of the corbel positions of the variable diameter circular tube oblique truss, corbel positioning pieces are set on the assembly tire frame for positioning, and then the positioning distance between each assembly tire frame is determined according to the corbel position.

7. The positioning assembly construction method of the special-shaped variable-diameter circular tube oblique truss steel structure according to claim 1, characterized in that, When each variable diameter circular tube inclined truss is positioned and fixed on the assembly frame in sequence for pre-assembly, first a two-dimensional plane figure is calculated through the three-dimensional model of the special-shaped variable diameter circular tube inclined truss steel structure, the previous variable diameter circular tube inclined truss is hoisted on the assembly frame, the positions of the various center lines of gravity of the previous variable diameter circular tube inclined truss arranged at intervals along the length direction are measured and positioned with reference to the two-dimensional plane figure, the dimensional deviation of the previous variable diameter circular tube inclined truss is reviewed, and then the next variable diameter circular tube inclined truss is hoisted, and positioned with reference to the two-dimensional plane figure according to the cross-sectional width distance between the previous variable diameter circular tube inclined truss and the next variable diameter circular tube inclined truss, and the previous variable diameter circular tube inclined truss and the next variable diameter circular tube inclined truss are welded.

8. The positioning and assembling construction method of the special-shaped variable-diameter circular tube oblique truss steel structure according to claim 7, characterized in that, Before the welding of the first variable-diameter circular tube gable frame and the second variable-diameter circular tube gable frame, the distance between the diagonal lines of the first variable-diameter circular tube gable frame and the second variable-diameter circular tube gable frame is measured, and the positioning is performed with reference to the two-dimensional planar figure.

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