CN115354741B

CN115354741B - Self-balancing umbrella shell system and forming method

Info

Publication number: CN115354741B
Application number: CN202211011957.7A
Authority: CN
Inventors: 王载; 叶垚; 武启剑; 陈婷婷
Original assignee: China Architecture Design and Research Group Co Ltd
Current assignee: China Architecture Design and Research Group Co Ltd
Priority date: 2022-08-23
Filing date: 2022-08-23
Publication date: 2024-04-23
Anticipated expiration: 2042-08-23
Also published as: CN115354741A

Abstract

The invention relates to a self-balancing umbrella shell system and a forming method, belongs to the technical field of constructional engineering, and solves the problems that in the prior art, an umbrella shell structure which is large in size and can meet the requirement of a heavy roof is not available, so that the modeling and functional requirements of people on a building which can play a role in shielding can not be met. The self-balancing umbrella shell system comprises a plurality of self-balancing umbrella shell structures and connecting grids; the self-balancing umbrella shell structures are connected through the connecting grids; the connection grid includes a first connection grid, a second connection grid, and a third connection grid. The invention realizes flexible and free combination of a plurality of umbrella shells.

Description

Self-balancing umbrella shell system and forming method

Technical Field

The invention relates to the technical field of constructional engineering, in particular to a self-balancing umbrella shell system and a forming method thereof.

Background

With the development of social economy and engineering technology, the requirements of people on building modeling are higher and higher, and the umbrella shell structure is widely applied to outdoor public buildings with appearance modeling requirements and large space requirements, such as squares, outdoor exhibition halls and the like, due to attractive modeling and flexible layout.

The umbrella shell is formed by connecting and combining a plurality of umbrella shell structures, but the existing connecting form is complex, and the standardized and modularized production and processing are difficult to realize, so that the flexible and free combination of the plurality of umbrella shells is difficult to realize.

In addition, the diameter of the existing umbrella shell structure for landscape modeling is generally smaller than 20 meters, and the roof practice is generally light roof, such as: membrane roofing, metal roofing etc., the external load is less. With the development of social economy and engineering technology, the requirements of people on the modeling and the functions of a building with a shielding effect are higher and higher, for example, the building can bear the heavy roof practice of a water roof, a planting roof and the like, and can cover an umbrella shell system with a larger area. This requires a larger overall planar size of the canopy system, requiring a larger size of the individual canopy structure and better carrying capacity. However, the existing umbrella shell system or umbrella shell structure cannot meet the above requirements.

Disclosure of Invention

In view of the above analysis, the present invention aims to provide a self-balancing umbrella shell system and a forming method thereof, which are used for solving the problems that in the prior art, there is no umbrella shell structure with a large size and capable of meeting the requirement of heavy roof practice, and thus, the requirements of people on the modeling and the functions of a building capable of playing a role in shielding cannot be met.

The aim of the invention is mainly realized by the following technical scheme:

In one aspect, the present invention provides a self-balancing umbrella housing system comprising a self-balancing umbrella housing structure and a connecting grid; the self-balancing umbrella shell structure is connected through the connecting grid.

Optionally, the connection grid comprises a first connection grid; the number of the self-balancing umbrella shell structures is two, and the two self-balancing umbrella shell structures are connected through the first connecting grid.

Optionally, the connection grids further comprise three second connection grids, and the three self-balancing umbrella shell structures are distributed in a central symmetry mode and are connected with the second connection grids through the first connection grids.

Optionally, the connection grids further comprise three self-balancing umbrella shell structures, and the three self-balancing umbrella shell structures are arranged in an axisymmetric mode and are connected with the third connection grids through the first connection grids.

Optionally, the first connection grid comprises five chords, one stay bar and four pull bars, and the chords, the stay bars and the pull bars are connected in a penetrating manner.

Optionally, the chord member, the stay bar and the pull rod are all made of stainless steel.

Optionally, the second connection grid comprises three chords, and the chords are connected in a penetrating manner.

Optionally, the third connection grid includes ten chords, three stay bars and ten tie bars, and the chords, the stay bars and the tie bars are connected in a penetrating manner.

Optionally, the self-balancing umbrella shell structure comprises a stand column, a plurality of main rib rods, a plurality of secondary rib rods, a plurality of outer ring rods and a plurality of supporting rods.

On the other hand, the invention also provides a method for forming the self-balancing umbrella shell system, which is used for forming the self-balancing umbrella shell system and comprises the following steps:

Step 1: determining the size of a self-balancing umbrella shell structure and the combination mode of a plurality of self-balancing umbrella shell structures according to the requirements of a building site;

step 2: manufacturing a self-balancing umbrella shell structure;

step3: and connecting the plurality of self-balancing umbrella shell structures through a connecting grid to obtain a self-balancing umbrella shell system.

Optionally, the plurality of main rib rods and the plurality of secondary rib rods intersect to form an intersection point, and the main rib rods and the secondary rib rods are arranged at intervals; two ends of each outer ring rod are respectively connected with the adjacent main rib rods and the adjacent secondary rib rods to form a closed loop, so as to form an umbrella shell unit; the support rod is positioned in the closed loop and used for keeping the stability of the umbrella shell unit; one end of the upright post is connected with the intersection point, and the other end of the upright post is connected with the foundation.

Optionally, the main rib rods and the secondary rib rods which are arranged at intervals equally divide the horizontal projection circular surface of the self-balancing umbrella shell structure.

Optionally, one end of the supporting rod is connected with the main rib rod, and the other end of the supporting rod is connected with the secondary rib rod.

Optionally, the struts are disposed diagonally within the closed loop.

Optionally, the struts include a first loop strut, a second loop strut, and a third loop strut; the self-balancing umbrella shell structure comprises six main rib rods, six secondary rib rods, twelve first ring support rods, twenty-four second ring support rods, twenty-four third ring support rods and twelve outer ring rods; the twelve first ring support rods are connected end to end in sequence, and the twelve outer ring rods are connected end to end in sequence; the twenty-four second ring support rods are divided into two groups, and twelve second ring support rods in each group are connected end to end in sequence; the twenty-four third ring support rods are divided into two groups, and twelve third ring support rods in each group are connected end to end in sequence.

Optionally, each of the umbrella housing units comprises a first ring strut, two second ring struts and two third ring struts; in each umbrella shell unit, two ends of the first ring supporting rod, the second ring supporting rod and the third ring supporting rod are respectively connected with the main rib rod and the secondary rib rod, and the two second ring supporting rods and the two third ring supporting rods are respectively arranged in a crossing way; the first ring support rod is positioned near the joint of the main rib rod and the secondary rib rod, and the second ring support rod is positioned between the first ring support rod and the third ring support rod.

Optionally, in each umbrella shell unit, one end of the first ring support rod is connected with the secondary rib rod, and the other end of the first ring support rod is connected with a first connecting point on the main rib rod; one end of the second ring support rod is connected with the first connecting point, and the other end of the second ring support rod is connected with the second connecting point on the secondary rib rod; one end of the other second ring support rod is connected with the secondary rib rod, and the other end of the other second ring support rod is connected with a third joint point on the main rib rod; one end of the third ring supporting rod is connected with the third joint, and the other end of the third ring supporting rod is connected with the joint of the secondary rib rod and the outer ring rod; one end of the other third ring support rod is connected with the second connecting point, and the other end of the other third ring support rod is connected with the connecting position of the main rib rod and the outer ring rod.

Compared with the prior art, the invention has at least one of the following beneficial effects:

(1) The umbrella shell structure can fully exert the stress characteristic of the space shell, namely the umbrella shell structure mainly transmits load through a force transmission path in the shell surface, can fully exert the function of the space shell and has reasonable stress; the dead weight and external load of the umbrella shell surface are finally gathered to the upright post from the main rib rod and the secondary rib rod to the center and then transmitted to the foundation from the upright post, so that the stability and the service life of the umbrella shell structure are greatly improved, and the umbrella shell structure can meet the bearing capacity and the stress requirement of an umbrella shell unit of more than 20 meters.

(2) The umbrella shell structure of the invention can fully exert the stress characteristic of the space shell by finding the shape of the umbrella shell, namely the umbrella shell structure mainly transmits load through a force transmission path in a shell surface, and the stress ratio generated by bending moment under design load is less than 15 percent, so that on one hand, the integral stability of the umbrella shell structure is greatly improved, and on the other hand, the umbrella shell structure of the invention can meet the bearing capacity requirement of the method of the heavy roof with the diameter of more than 20 meters by adopting a rod piece with smaller sectional area and thinner wall thickness.

(3) The invention improves the stress performance of the umbrella shell structure by alternately arranging the main rib rods and the secondary rib rods and arranging the support rods at different positions in a monoclinic and crossed way so as to reduce the section size of the rod piece and form a rhythm grid form so as to improve the modeling appearance.

(4) Under the action of vertical downward external load, the end parts of the main rib rod and the secondary rib rod of the umbrella shell structure can generate horizontal unbalanced thrust.

(5) Because the special umbrella shell structure and the combination form of the special umbrella shell structure form a plurality of special structural forms at the joints of the umbrella shell structures, different connection grids (such as a first connection grid, a second connection grid and a third connection grid) are arranged according to the special structural forms at the joints of the plurality of umbrella shell structures, flexible and free combination of the plurality of umbrella shell structures can be realized, the connection grids are simple, and the different combination modes all take a single umbrella shell structure as a basic unit, so that standardized and modularized production and processing can be realized.

(6) The components (main rib rod, secondary rib rod, outer ring rod, supporting rod and connecting grid (chord rod, supporting rod and pull rod)) of the invention are processed by adopting all stainless steel materials. The application of the stainless steel material can eliminate the spraying of anti-corrosion paint, retain the metallic appearance of the structure and remarkably reduce the carbon emission of the structure.

(7) When the roof system is arranged in the building modeling or functional requirement, the joints formed by the intersecting positions of the supporting rods and the supporting rods, the intersecting positions of the supporting rods and the rib rods (comprising the main rib rods and the secondary rib rods), the intersecting positions of the rib rods (comprising the main rib rods and the secondary rib rods) and the outer ring rods and the like all have the rooting condition of the roof system, so that the application range of the umbrella shell structure is enlarged.

In the invention, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views.

FIG. 1 is a top view of a self-balancing umbrella housing structure of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a left side view of the self-balancing umbrella housing structure of the present invention;

FIG. 4 is an isometric view of the self-balancing umbrella housing structure of the present invention;

FIG. 5 is a view of the main rib post projected on a horizontal plane;

FIG. 6 is a view of the secondary rib post after projection on a horizontal plane;

FIG. 7 is a view of the first loop struts after projection on a horizontal plane;

FIG. 8 is a view of the second ring strut after projection on a horizontal plane;

FIG. 9 is a view of the third ring strut after projection on a horizontal plane;

FIG. 10 is a view of the outer ring bar after projection on a horizontal plane;

FIG. 11 is a schematic view of the assembled two umbrella housing structures;

FIG. 12 is a schematic view of the first connection grid of FIG. 11;

FIG. 13 is an A-A view of the first connection grid of FIG. 11;

FIG. 14 is a B-B view of the first connection grid of FIG. 11;

FIG. 15 is a schematic view of the three canopy structures assembled in a center-symmetrical manner;

FIG. 16 is a schematic view of the structure of the second connection grid of FIG. 15;

FIG. 17 is a schematic view of the three canopy structures assembled in an axisymmetric manner;

FIG. 18 is a schematic view of the third connecting grid of FIG. 17;

FIG. 19 is an A-A view of the third connection grid of FIG. 17;

FIG. 20 is a B-B view of the third connection grid of FIG. 17;

Fig. 21 is a C-C view of the third connection grid of fig. 17.

Reference numerals:

1-main rib rod, 2-secondary rib rod, 3-first ring support rod, 4-second ring support rod, 5-third ring support rod, 6-outer ring rod, 7-upright post, 8-umbrella shell unit, 9-first connection grid, 10-second connection grid, 11-third connection grid, 12-chord, 13-brace rod and 14-pull rod.

Detailed Description

The following detailed description of preferred embodiments of the invention is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the invention, are used to explain the principles of the invention and are not intended to limit the scope of the invention.

Example 1

As shown in fig. 1 to 4, in one embodiment of the present invention, a self-balancing umbrella housing structure is disclosed, which comprises a plurality of main rib bars 1, a plurality of sub rib bars 2, a plurality of outer ring bars 6, a plurality of struts and columns 7.

Referring to fig. 1, a plurality of main rib bars 1 and a plurality of sub rib bars 2 intersect to form an intersection point, and the main rib bars 1 and the sub rib bars 2 are disposed at intervals.

Referring to fig. 2, both ends of each outer ring rod 6 are connected with the adjacent main rib rods 1 and sub rib rods 2, respectively, to form an umbrella case unit 8. The struts are located within the umbrella housing unit 8 for maintaining stability of the umbrella housing unit 8. The umbrella housing unit 8 is closed loop.

As shown in fig. 3 and 4, one end of the upright 7 is fixedly connected to the intersection point, and the other end is connected to a foundation (e.g., the ground) to support a plurality of umbrella housing units 8.

In a preferred embodiment, the struts are connected at one end to the primary rib 1 and at the other end to the secondary rib 2.

Specifically, the struts are inclined in the umbrella case unit 8. By oblique arrangement is meant that the struts are arranged obliquely with respect to the outer ring bar 6, i.e. the struts are not parallel to the outer ring bar 6.

As shown in fig. 1, in the self-balancing umbrella shell structure of the present embodiment, the projection of the main rib bars and the sub rib bars, which are arranged at intervals, on the horizontal projection plane equally divides the horizontal projection circular plane of the umbrella shell structure. The projections of the plurality of main rib rods, the plurality of secondary rib rods, the plurality of first ring struts, the plurality of second ring struts, the plurality of third ring struts and the plurality of outer ring struts on the horizontal plane are respectively shown in fig. 5-10.

Further, the struts include a first looped strut 3, a second looped strut 4 and a third looped strut 5.

In a preferred embodiment, the number of the main rib bars, the secondary rib bars, the first ring support bars, the second ring support bars, the third ring support bars and the outer ring support bars of the self-balancing umbrella shell structure of this embodiment is six, twelve, twenty-four and twelve respectively.

Twelve first ring struts 3 are connected end to end in sequence, and twelve outer ring struts 6 are connected end to end in sequence. Twenty-four second ring struts 4 are divided into two groups, and twelve second ring struts 4 in each group are connected end to end in sequence. Twenty-four third ring struts 5 are divided into two groups, and twelve third ring struts 5 in each group are connected end to end in sequence.

In this embodiment, the diameter of the horizontal projection circular surface of the umbrella shell structure (i.e., the outer diameter of the umbrella shell) is 21 meters. The horizontal projection round surface of the umbrella shell structure is twelve equally divided by six main rib rods and six secondary rib rods which are arranged at intervals, namely 12 umbrella shell units.

Each umbrella housing unit comprises a first ring support rod 3, two second ring support rods 4 and two third ring support rods 5.

In each umbrella shell unit, two ends of a first ring supporting rod 3, a second ring supporting rod 4 and a third ring supporting rod 5 are respectively connected with a main rib rod 1 and a secondary rib rod 2, and two second ring supporting rods 4 and two third ring supporting rods 5 are respectively arranged in a crossing way; the distance from the first ring strut to the junction of the main rib rod and the secondary rib rod is smaller than the distance from the first ring strut to the outer ring rod, namely, the first ring strut 3 is positioned close to the junction of the main rib rod and the secondary rib rod, and the second ring strut 4 is positioned between the first ring strut 3 and the third ring strut 5.

In a preferred embodiment, the first loop bar is connected at one end to the secondary rib bar and at the other end to a first abutment on the primary rib bar.

One end of a second ring support rod is connected with a first connecting point on the main rib rod, and the other end of the second ring support rod is connected with a second connecting point on the secondary rib rod. One end of the other second ring support rod is connected with the secondary rib rod, and the other end is connected with a third joint point on the main rib rod.

One end of a third ring supporting rod is connected with a third joint point on the main rib rod, and the other end is connected with the joint of the secondary rib rod and the outer ring rod. One end of the other third ring support rod is connected with the second connecting point on the secondary rib rod, and the other end is connected with the connecting point of the main rib rod and the outer ring rod.

The constituent members (main rib, sub rib, outer ring, strut, and connection grid (chord, stay, tie)) of the present embodiment are fabricated from an all-stainless steel material. The application of the stainless steel material can avoid spraying the anti-corrosion coating, not only maintains the metallic appearance of the structure, but also can obviously reduce the carbon emission of the structure.

Example two

As shown in fig. 11-14, another embodiment of the present invention discloses a stainless steel self-balancing umbrella housing system that can be flexibly combined, comprising a self-balancing umbrella housing structure and a first connection grid 9 of the first two embodiments. The two self-balancing canopy structures are connected by two first connection grids 9.

As shown in fig. 12, the first connection grid 9 includes five chords 12, one stay 13 and four stays 14, each of which is connected through.

Example III

As shown in fig. 15, another embodiment of the present invention discloses a stainless steel self-balancing umbrella housing system capable of being flexibly combined, comprising a self-balancing umbrella housing structure of the first embodiment, three first connection grids 9 and one second connection grid 10.

The three self-balancing umbrella shell structures are distributed in a central symmetry mode, adjacent self-balancing umbrella shell structures are connected through a first connecting grid 9, a second connecting grid 10 is arranged at the symmetrical center of the three self-balancing umbrella shell structures, and the three self-balancing umbrella shell structures are connected together through the second connecting grid 10.

As shown in fig. 16, the second connecting grid 10 includes three chords 12, each of which is connected in series.

Example IV

As shown in fig. 17, another embodiment of the present invention discloses a stainless steel self-balancing umbrella housing system capable of being flexibly combined, comprising a self-balancing umbrella housing structure of the first embodiment, two first connecting grids 9 and a third connecting grid 11.

The three self-balancing umbrella shell structures are arranged in an axisymmetric mode, the upper ends of two adjacent self-balancing umbrella shell structures are connected through two first connecting grids respectively, and the lower ends of the three self-balancing umbrella shell structures are connected through a third connecting grid.

As shown in fig. 18-21, the third connection grid includes ten chords 12, three struts 13 and ten tie rods 14, each of which is connected in series.

Example five

In another embodiment of the present invention, a method for forming a self-balancing umbrella housing system is also disclosed, for forming the self-balancing umbrella housing system of embodiments two to four, comprising the steps of:

step 1: and determining the size of the self-balancing umbrella shell structure and the combination mode of a plurality of self-balancing umbrella shell structures according to the requirements of the building site.

In order to fully exert the stress characteristic of the space shell (namely, the main force transmission path is the force transmission in the shell surface under the action of external load), the shape of the self-balancing umbrella shell is determined by the following method, and the specific process is as follows:

step 11: determining building boundary conditions and elevation requirements;

Step 12: establishing a shape finding initial model, wherein the initial model is a plane single shell, and the coordinates of each node of the initial model are determined by projection of an umbrella shell structure on a horizontal plane;

Step 13: applying external load vertically upwards to each node of the initial model in the form of node load, further adjusting the elastic modulus of the model material to perform nonlinear analysis until the elevation of the control node meets the building requirement, and recording unbalanced displacement of each node at the moment (namely, the deviation value of the node and the building design node in the horizontal direction after the shape finding);

step 14: and reversely applying the unbalanced displacement to the initial model, and repeating the step 13 until the unbalanced displacement of the nodes after the shape finding is smaller than a set tolerance value, and recording the final coordinates of each node after the shape finding.

Step 2: the self-balancing umbrella shell structure is formed, and specifically comprises the following steps:

step 21: and fixing the upright posts, uniformly and radially extending out a plurality of main rib rods by taking the top ends of the upright posts as the center, and equally dividing sub rib rods in a shell surface formed by the adjacent main rib rods. The method specifically comprises the following steps:

6 main rib rods uniformly and radially extend outwards by taking the top end of the upright post as a center to form a main body framework of the umbrella shell structure; secondary rib bars are equally arranged in the shell surface formed by the adjacent main rib bars so as to improve structural stress, and 6 secondary rib bars are totally arranged. The main rib rods and the secondary rib rods are sequentially arranged at intervals, and the horizontal projection round surface 12 of the umbrella shell structure is equally divided by 6 main rib rods and 6 secondary rib rods.

Step 22: and a supporting rod is arranged between the adjacent main rib rod and the adjacent secondary rib rod. The method specifically comprises the following steps:

Three groups of struts (named as a first ring strut, a second ring strut and a third ring strut in sequence according to the distance from the top end of the upright post) are arranged between the adjacent main rib rods and the secondary rib rods to form an umbrella shell structure shell surface, wherein the first ring struts (12 in total) are arranged in a monoclinic way, and the second ring struts (24 in total) and the third ring struts (24 in total) are arranged in a double-rod cross way.

Step 23: and connecting two ends of the outer ring rod with the adjacent main rib rod and secondary rib rod respectively to form a closed loop to form an umbrella shell unit, thereby obtaining the self-balancing umbrella shell structure. The method specifically comprises the following steps:

12 stronger outer ring rods are arranged on the outermost ring of the umbrella shell structure in a closed loop mode to balance the external thrust of the ends of the main rib rod and the secondary rib rod under the action of vertical load, so that a self-balancing system is formed.

The section specifications of each part of rod pieces of the main rib rod 1, the secondary rib rod 2, the first ring support rod 3, the second ring support rod 4, the third ring support rod 5, the outer ring rod 6 and the upright post 7 are calculated and determined from the bearing capacity and the rigidity according to the external load condition respectively by referring to the related regulations of the current related regulations, regulations GB 50017 and JGJ 7, and the section forms of each rod piece can be rectangular pipes, round pipes, elliptical pipes, box pipes and the like according to the design appearance requirements.

Specifically, in this embodiment, the main rib rod 1 is a rectangular tube (the cross section is rectangular), and the sub rib rod, the outer ring rod, the first ring support rod, the second ring support rod and the third ring support rod are oval tubes (the cross section is oval). The rectangular tube had dimensions of 300 mm. Times.200 mm. Times.8 mm in length. Times.width. Times.wall thickness. The minor rib bars have dimensions of 220mm x 150mm x 8mm long axis x short axis x wall thickness. The outer ring rod has dimensions of 230mm x 150mm x 12mm long axis x short axis x wall thickness. The first loop struts, second loop struts, and third loop struts have dimensions major axis x minor axis x wall thickness of 180mm x 100mm x 4mm.

In addition, the main rib rod 1, the secondary rib rod 2, the first ring support rod 3, the second ring support rod 4, the third ring support rod 5 and the outer ring rod 6 can be connected in a form of intersecting nodes, the node strength meets the requirements of the current relevant specifications and regulations GB 50017, and if the strength is insufficient, the node domain can be reinforced by adopting measures such as adding rib plates, local reinforcing rods and the like.

In addition, the connection of the umbrella shell consisting of the main rib rod 1, the secondary rib rod 2, the first ring support rod 3, the second ring support rod 4, the third ring support rod 5 and the outer ring support rod 6 and the upright post 7 can adopt ball nodes, drum nodes and the like according to the design appearance requirement, and the node strength meets the requirements of the current relevant specifications and regulations GB 50017.

Step 3: and (3) connecting the plurality of umbrella shell structures obtained in the step (2) through a connecting grid to obtain a self-balancing umbrella shell system. The method specifically comprises the following steps:

As shown in fig. 11, when two self-balancing umbrella housing structures are combined, the two self-balancing umbrella housing structures are connected by two first connection grids.

As shown in fig. 15, when three self-balancing umbrella housing structures are connected together in a centrosymmetric manner, three second connection grids and one second connection grid are used to connect the three self-balancing umbrella housing structures together.

As shown in fig. 17, when three self-balancing umbrella housing structures are connected in an axisymmetric manner, two first connection grids are used to connect two adjacent self-balancing umbrella housing structures, respectively, and one third connection grid is used to connect three self-balancing umbrella housing structures.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.

Claims

1. A method of forming a self-balancing umbrella housing system, comprising the steps of:

step 2: manufacturing a self-balancing umbrella shell structure;

step3: connecting a plurality of self-balancing umbrella shell structures through a connecting grid to obtain a self-balancing umbrella shell system;

the self-balancing umbrella shell system comprises a self-balancing umbrella shell structure and a connecting grid; the self-balancing umbrella shell structure is connected through the connecting grid;

the connection grids comprise a first connection grid, a second connection grid and a third connection grid;

the self-balancing umbrella shell structure can meet the bearing capacity requirement of the heavy roof with the diameter of more than 20 meters;

The number of the self-balancing umbrella shell structures is two, and the two self-balancing umbrella shell structures are connected through the first connecting grid; or alternatively

The three self-balancing umbrella shell structures are distributed in a central symmetry mode and are connected with the second connecting grids through the first connecting grids; or alternatively

The three self-balancing umbrella shell structures are arranged in an axisymmetric mode and are connected with the third connecting grid through the first connecting grid;

The first connecting grid comprises five chords, a stay bar and four pull bars, and the chords, the stay bars and the pull bars are connected in a penetrating manner;

The second connecting grid comprises three chords, and the chords are connected in a penetrating manner;

The third connecting grid comprises ten chords, three stay bars and ten pull bars, and the chords, the stay bars and the pull bars are connected in a penetrating manner;

The self-balancing umbrella shell structure comprises an upright post, a main rib rod, a secondary rib rod, an outer ring rod and a supporting rod.

2. The method of forming of claim 1, wherein the chord, brace, and brace are all stainless steel.