CN219343504U - Grid structure - Google Patents

Abstract

The utility model relates to the technical field of steel structures and space structures, and discloses a grid structure, which comprises: go up the rack, connect by a plurality of members and a plurality of ball joints and constitute, go up the ball joint and include the spheroid, be provided with a plurality of short tubes along the radial, go up the short tube first end with go up the spheroid and be connected, the second end with go up the member and be connected, lower rack, set up in the below of going up the rack, lower rack is connected by a plurality of lower members and a plurality of ball joint and is constituteed down, down the ball joint includes down the spheroid, has linked firmly a plurality of short tubes along the radial, the short tube is round platform form down, great open-ended one end with down the spheroid is connected, less open-ended one end with down the member is connected, a plurality of web members, first end with go up the short tube and be connected, the second end with corresponding down the short tube is connected. The utility model can utilize the conception of the variable cross-section lower short pipe to relieve stress concentration and is beneficial to improving the fatigue resistance.

Description

Grid structure

Technical Field

The utility model relates to the technical field of steel structures and space structures, in particular to a grid structure.

Background

In recent years, the grid structure is widely applied to civil buildings, such as large public buildings of gymnasiums, exhibition halls, railway stations, theatres and the like, and is widely applied to industrial buildings, such as aircraft maintenance libraries, water plants, large-span industrial workshops and the like. The overhead crane is usually arranged in the grid structure of the industrial building, the advantages of convenient operation, flexible arrangement and wide movable range are fully utilized, and the welding work of welding the hollow ball node grid structure is finished on site.

However, when the grid structure is applied more and more widely, the fatigue problem of the grid structure needs to be emphasized when the hanging crane lifts, the grid on the upper layer can bear upward tension in the lifting process of the hanging crane, the grid on the lower layer can bear pressure, meanwhile, the allowable stress at the weld toe of the spherical surface of the welded hollow ball joint is lower, after the stress is overlarge, the occurrence of uneven stress condition at the joint of the grid structure can lead to fatigue hidden danger, and once the fatigue accident occurs, the life and property safety of people can be seriously threatened.

Disclosure of Invention

The utility model provides a grid structure, which can utilize the conception of a variable-section lower short pipe to lighten the whole grid structure, and adopts different contact surfaces to connect one ends of different bending moments so as to relieve stress concentration and facilitate the improvement of fatigue resistance.

The utility model provides a grid structure, comprising:

the upper net frame is formed by connecting a plurality of upper rod pieces and a plurality of upper ball joints, the upper ball joints comprise upper spheres, a plurality of upper short pipes are arranged along the radial direction, the first ends of the upper short pipes are connected with the upper spheres, and the second ends of the upper short pipes are connected with the upper rod pieces;

the lower net frame is arranged below the upper net frame and is formed by connecting a plurality of lower rod pieces and a plurality of lower ball joints, each lower ball joint comprises a lower ball body, a plurality of lower short pipes are fixedly connected in the radial direction, each lower short pipe is in a circular truncated cone shape, one end of a larger opening is connected with the corresponding lower ball body, and one end of a smaller opening is connected with the corresponding lower rod piece;

and the first ends of the web members are connected with the upper short pipes, and the second ends of the web members are connected with the corresponding lower short pipes.

Preferably, the first end of the upper short tube is fixedly connected with the upper sphere, and the second end is detachably connected with the upper rod piece;

one end of the bigger opening of the lower short pipe is fixedly connected with the lower ball body, and one end of the smaller opening is detachably connected with the lower rod piece;

the first end of the web member is detachably connected with the upper short tube, and the second end of the web member is detachably connected with the corresponding lower short tube.

Preferably, the two ends of the upper rod piece, the lower rod piece and the web member are fixedly connected with rod piece flanges, the ends of the upper short pipe and the lower short pipe are fixedly connected with node flanges, and the rod piece flanges are connected with the corresponding rod piece flanges through bolts and nuts.

Preferably, the bolts are high strength bolts that can withstand large loads.

Preferably, the number of nuts sleeved on each bolt is two.

Preferably, the diameters, the plate thicknesses and the number of the connecting holes of the node flange and the rod piece flange are the same.

Compared with the prior art, the utility model has the beneficial effects that: because the connection node of the upper net frame mainly bears the tensile force, the connection node of the lower net frame mainly bears the pressure, the lower short pipe in the lower net frame is designed into a variable cross section steel pipe, a larger cross section is adopted at a larger bending moment, a smaller cross section is adopted at a smaller bending moment, the variable cross section of the lower short pipe can save materials on the basis of ensuring the strength, the weight of the whole net frame is lightened, the steel consumption is reduced as much as possible while the structural design is optimized, the fatigue resistance of the web member is improved, the tensile force of the upper net frame is also reduced along with the steel consumption, the stress concentration is relieved, the fatigue resistance is improved, the connection between lower rod pieces and the connection node with the web member are protected, and the occurrence of fatigue fracture and the like due to the influence of the larger stress is greatly reduced.

Drawings

Fig. 1 is a schematic structural diagram of a grid structure according to an embodiment of the present utility model;

fig. 2 is an exploded view of an upper ball node of a grid structure according to an embodiment of the present utility model;

fig. 3 is an exploded view of a lower ball node of a grid structure according to an embodiment of the present utility model;

fig. 4 is a schematic cross-sectional view of a ball node on a portion of a grid structure according to an embodiment of the present utility model;

fig. 5 is a schematic cross-sectional view of a part of a ball-falling node of a grid structure according to an embodiment of the present utility model;

fig. 6 is a schematic view of a lower rod structure of a grid structure according to an embodiment of the present utility model.

Reference numerals illustrate:

1. a net rack is arranged; 11. an upper rod piece; 12. ball loading nodes; 121. an upper sphere; 122. an upper short pipe; 2. a lower net rack; 21. a lower rod piece; 22. a ball-falling node; 221. a lower sphere; 222. a lower short tube; 3. a web member; 4. a rod piece flange plate; 5. a node flange; 6. a bolt; 7. and (3) a nut.

Detailed Description

One embodiment of the present utility model will be described in detail below with reference to the attached drawings, but it should be understood that the scope of the present utility model is not limited by the embodiment.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the technical solutions of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Referring to fig. 1, 2 and 3, the present utility model provides a grid structure including: the upper net frame 1, the lower net frame 2, a plurality of web members 3, upper net frame 1 is connected by a plurality of upper member bars 11 and a plurality of upper ball node 12 and constitutes, upper ball node 12 includes upper spheroid 121, be provided with a plurality of upper short pipes 122 along the radial direction, upper short pipe 122 first end is connected with upper spheroid 121, the second end is connected with upper member bar 11, lower net frame 2 sets up in the below of upper net frame 1, lower net frame 2 comprises a plurality of lower member bars 21 and a plurality of lower ball node 22 connection, lower ball node 22 includes down spheroid 221, a plurality of lower short pipes 222 have been linked firmly along the radial direction, lower short pipe 222 is the round platform form, great open-ended one end is connected with lower spheroid 221, less open-ended one end is connected with lower member bar 21, a plurality of web members 3 first ends are connected with upper short pipe 122, the second end is connected with corresponding lower short pipe 222.

In the above embodiment, since the connection node of the upper net frame 1 mainly bears the tensile force, the connection node of the lower net frame 2 mainly bears the compressive force, so the lower short pipe 222 in the lower net frame 2 is designed into a variable cross-section steel pipe, the larger cross-section is adopted at the position with larger bending moment, the smaller cross-section is adopted at the position with smaller bending moment, the variable cross-section of the lower short pipe 222 can save materials on the basis of ensuring the strength, and the weight of the whole net frame is reduced, the steel consumption is reduced as much as possible while the structural design is optimized, the fatigue resistance of the web member 3 is improved, the tensile force of the upper net frame 1 is also reduced, the stress concentration is relieved, the fatigue resistance is improved, the connection between the lower net frame 21 and the connection node with the web member 3 are protected, and the occurrence of fatigue fracture and the like due to the influence of the larger stress is greatly reduced.

Further, referring to fig. 2 and 3, the first end of the upper short tube 122 is fixedly connected with the upper sphere 121, the second end is detachably connected with the upper rod 11, the larger open end of the lower short tube 222 is fixedly connected with the lower sphere 221, the smaller open end is detachably connected with the lower rod 21, the first end of the web member 3 is detachably connected with the upper short tube 122, the second end is detachably connected with the corresponding lower short tube 222, as shown in fig. 6, the two ends of the upper rod 11, the lower rod 21 and the web member 3 are fixedly connected with the rod flange 4, the ends of the upper short tube 122 and the lower short tube 222 are fixedly connected with the node flange 5, and the rod flange 4 is connected with the corresponding rod flange 4 through the bolt 6 and the nut 7.

In the above embodiment, the mode that the node flange 5 and the rod member flange 4 are connected through the bolts 6 and the nuts 7 is more conventional, so that the node flange has stronger connectivity, the whole grid structure is assembled, the welding workload of a construction site can be greatly reduced, the construction period is saved, and the economic benefit is improved.

Further, referring to fig. 2, 3 and 4, the bolts 6 are high strength bolts 6, which can bear large load force, and is favorable for improving fatigue resistance, and the number of nuts 7 sleeved on each bolt 6 is two, and when 2 nuts 7 and more nuts are arranged on each high strength bolt 6, the safety reserve of the high strength bolts 6 can be increased, and the diameters, the plate thicknesses and the number of connecting holes of the node flange 5 and the rod flange 4 are the same.

In the above embodiment, the number of the limited nuts 7 is two, and compared with one nut 7, the connection strength is higher, the parameters of the set node flange 5 and the rod flange 4 are the same, so that the size of the parts can be standardized, and the unified standard installation and replacement are convenient.

Further, referring to fig. 4 and 5, the upper short tube 122 and the lower short tube 222 are made of steel, have high strength, and the upper sphere 121 and the lower sphere 221 are hollow spheres, so that the weight is reduced on the basis of being capable of bearing a certain stress.

The steps of each part and the processing steps are as follows:

s1, processing two round steel plates into two hemispherical shells, welding after splicing to obtain an upper sphere 121 and a lower sphere 221, clamping round steel pipes on a cutting machine for feeding and discharging to obtain a lower rod piece 21, an upper rod piece 11 and an upper short pipe 122;

s2, feeding and discharging the steel plate clamping and shearing machine to obtain a node flange 5 and a rod piece flange 4, and shaping to the flatness of 0.02;

s3, clamping the node flange 5 by using a vice, and welding with one end of a corresponding upper short or lower steel pipe with a smaller opening after processing connecting holes on the flange one by one to obtain a connecting accessory;

s4, clamping the upper sphere 121 by using a vice, turning the node main body 90 degrees each time, and welding upper short pipes 122 with the node flanges 5 on the periphery of the upper sphere 121 one by one to obtain an upper sphere node 12 and a lower sphere node 22;

s5, checking the upper net frame 1 and the lower net frame 2 which are processed, and processing the next batch of components after the check is qualified by using the web members 3.

S6, preparing high-strength bolts 6, and sequentially connecting the upper net frame 1, the lower net frame 2 and the web members 3 by adopting an integral hoisting method or a high-altitude bulk method on a construction site to finish construction of the net frame structure.

The upper sphere 121, the lower sphere 221, the upper short tube 122, the lower short tube 222, the upper rod 11, the lower rod 21 and the flange are welded in factories, so that welding defects are reduced, and welding quality is improved.

1. The utility model can relieve stress concentration by utilizing the conception of the variable cross-section lower short pipe 222, and is beneficial to improving the anti-fatigue effect;

2. according to the grid structure, the parts are machined and manufactured in a factory, so that the welding quality is guaranteed, and the welding defects are reduced;

3. according to the grid structure, the nodes of the grid structure are connected by the high-strength bolts 6, so that the welding workload of a construction site is greatly reduced, the assembly degree of the grid structure is greatly improved, the construction period is saved, and the economic benefit is improved.

The foregoing disclosure is merely illustrative of some embodiments of the utility model, but the embodiments are not limited thereto and variations within the scope of the utility model will be apparent to those skilled in the art.

Claims (8)

1. A grid structure, comprising:

the upper net frame (1) is formed by connecting a plurality of upper rod pieces (11) and a plurality of upper ball joints (12), wherein each upper ball joint (12) comprises an upper ball body (121), a plurality of upper short pipes (122) are arranged along the radial direction, the first ends of the upper short pipes (122) are connected with the upper ball bodies (121), and the second ends of the upper short pipes are connected with the upper rod pieces (11);

the lower net rack (2) is arranged below the upper net rack (1), the lower net rack (2) is formed by connecting a plurality of lower rod pieces (21) and a plurality of lower ball nodes (22), the lower ball nodes (22) comprise lower balls (221), a plurality of lower short pipes (222) are fixedly connected in the radial direction, the lower short pipes (222) are in a circular truncated cone shape, one end of a larger opening is connected with the lower balls (221), and one end of a smaller opening is connected with the lower rod pieces (21);

-a plurality of web members (3), the first ends of which are connected to said upper short tubes (122) and the second ends of which are connected to the corresponding lower short tubes (222).

2. A grid structure according to claim 1, characterized in that the first end of the upper short tube (122) is fixedly connected with the upper sphere (121), and the second end is detachably connected with the upper rod (11);

one end of the bigger opening of the lower short pipe (222) is fixedly connected with the lower ball body (221), and one end of the smaller opening is detachably connected with the lower rod piece (21);

the first end of the web member (3) is detachably connected with the upper short tube (122), and the second end of the web member is detachably connected with the corresponding lower short tube (222).

3. The grid structure according to claim 2, wherein two ends of the upper rod (11), the lower rod (21) and the web member (3) are fixedly connected with rod flanges (4), ends of the upper short tube (122) and the lower short tube (222) are fixedly connected with node flanges (5), and the rod flanges (4) are connected with the corresponding rod flanges (4) through bolts (6) and nuts (7).

4. A grid structure according to claim 3, characterized in that the bolts (6) are high strength bolts (6).

5. A grid structure as claimed in claim 4, characterized in that the number of nuts (7) fitted over each of said bolts (6) is two.

6. A grid structure according to claim 5, characterized in that the diameters, plate thicknesses and the number of connecting holes of the node flanges (5) and the rod flanges (4) are the same.

7. The grid structure of claim 6, wherein the upper (122) and lower (222) spools are steel.

8. A grid structure according to claim 7, wherein the upper sphere (121) and the lower sphere (221) are hollow spheres.

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