Main-purlin-free roof space system of grid structure

Abstract

The invention provides a main-purlin-free roof space system of a grid structure, which is characterized in that a first chord member assembly is formed by arranging transverse upper chord members and longitudinal upper chord members in a staggered manner in a specific closed shape, and upper bolt balls are arranged at joints; the lower chord members of the second chord member assembly are arranged in a specific closed shape, and the lower bolt balls are arranged at the joints; the web member assembly is connected with upper and lower bolt balls of the first and second chord member assemblies to enhance the overall stability of the structure; the purlin support assembly is located above the first chord member assembly and connected with the adjacent transverse upper chord member to directly support a roof system, the net rack upper chord members serve as roof main purlins at the same time, the roof system is simplified, meanwhile, the bending moment applied to nodes when the chord members are bent is considered, and the bending shear strength of the structure is improved. The system prevents the main purlins from occupying space, and space utilization is optimized; the structural weight is reduced, and the requirement for foundation bearing capacity is lowered.

Description

Technical Field

[0001] The present invention relates to the technical field of building structures, and particularly to a space system for a grid structure without main purlins on the roof. Background Art

[0002] In the long-term application process of traditional bolted spherical grid structures, their design concepts and construction methods mainly rely on main purlins as the core supports and key elements for load transfer.

[0003] In the existing grid roof system, the setting of main purlins increases the structural complexity, material cost, and installation process. Moreover, due to the centralized assembly through bolted balls directly, the construction efficiency is not high. In addition, in traditional grid structures, the bending moment exerted on the joints when the chord members are bent is not considered, and only the tensile and compressive problems of the joints are considered, resulting in low flexural and shear strength.

[0004] Therefore, it is necessary to provide a space system for a grid structure without main purlins on the roof to solve the above technical problems. Summary of the Invention

[0005] The present invention provides a space system for a grid structure without main purlins on the roof to solve the problems in the existing grid structure roof system, such as the setting of main purlins and centralized assembly through bolted balls, the complexity of the grid structure, and low flexural and shear strength.

[0006] To solve the above technical problems, the technical solution of the present invention is: a space system for a grid structure without main purlins on the roof, which includes:

[0007] A first chord member assembly, the first chord member assembly includes:

[0008] A plurality of upper chord members, the plurality of upper chord members include at least two transverse upper chord members and at least two longitudinal upper chord members. At least two of the transverse upper chord members are arranged along a first direction; at least two of the longitudinal upper chord members are arranged along a second direction, and the transverse upper chord members and the longitudinal upper chord members are arranged in an alternating manner to form a specific closed shape. The straight line where the second direction is located is perpendicular to the straight line where the first direction is located; and

[0009] Upper bolted balls, arranged at the connection points of the transverse upper chord members and the longitudinal upper chord members;

[0010] A second chord member assembly, arranged below the first chord member assembly, wherein the second chord member assembly includes:

[0011] A plurality of lower chord members, the plurality of lower chord members are arranged in a specific closed shape; and

[0012] Lower bolted balls, arranged at the connection points of the plurality of lower chord members;

[0013] The web member assembly is disposed between the first chord member assembly and the second chord member assembly. The top end of the web member assembly is connected to the upper bolt ball, and the bottom end of the web member assembly is connected to the lower bolt ball; and

[0014] The purlin support assembly is located above the first chord member assembly, and the bottom end of the purlin support assembly is connected to the adjacent upper horizontal chord member. The purlin support assembly is used to support the roof system.

[0015] In the present invention, the purlin support assembly includes:

[0016] A purlin, disposed above the upper horizontal chord member, and the upper part of the purlin is used to support the roof system; and

[0017] A purlin support, the bottom end of the purlin support is welded to the upper horizontal chord member, and one side of the purlin support is connected to the side of the purlin.

[0018] In the present invention, the upper chord member is of a hollow structure. A sealing plate is provided at the end of the upper chord member, and reinforcement assemblies are respectively provided at both ends inside the upper chord member; the reinforcement assembly includes:

[0019] A reinforcement rod, disposed inside the upper chord member;

[0020] A reinforcement nut, disposed on the reinforcement rod, and the reinforcement nut abuts against the sealing plate; and

[0021] A support block, disposed at one end of the reinforcement rod, and the periphery of the support block fits against the inner wall of the upper chord member.

[0022] In the present invention, the sealing plate is provided with a through inner hole, and the other end of the reinforcement rod passes through the inner hole and extends;

[0023] The reinforcement assembly further includes a screw rod. One end of the screw rod is connected to the other end of the reinforcement rod, and the other end of the screw rod is connected to the upper bolt ball.

[0024] In the present invention, the reinforcement assembly further includes a sleeve: The screw rod includes:

[0025] A first connection portion, located at the end of the reinforcement rod away from the support block. The first connection portion is provided with an external thread, and the first connection portion is connected to the upper bolt ball; and

[0026] A second connection portion, located between the first connection portion and the reinforcement nut. The sleeve is sleeved on the second connection portion, and one end of the sleeve abuts against the upper bolt ball. The second connection portion and the sleeve are fixedly connected by a pin.

[0027] In the present invention, the diameter of the reinforcement rod is greater than or equal to the diameter of the screw rod, and the reinforcement rod and the screw rod are arranged on the same central axis.

[0028] In the present invention, the reinforcement component further includes an elastic tongue, which is connected to the outside of the second connecting portion and abuts against the inner wall of the sleeve.

[0029] In the present invention, a receiving groove is provided on the outside of the second connecting portion, and the elastic tongue is located in the receiving groove.

[0030] In the present invention, a stepped groove is provided on the inner wall of the sleeve, and a wear-resistant ceramic coating is provided on the side of the stepped groove.

[0031] In the present invention, the upper chord includes:

[0032] A connecting portion, located in the middle of the upper chord; and

[0033] A limiting portion, located at the end of the upper chord, and the inner diameter of the limiting portion gradually decreases at one end close to the connecting portion.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows: In the space system of the grid structure without main purlins of the present invention, the first chord member assembly is arranged in a specific closed shape by the staggered arrangement of the transverse upper chords and the longitudinal upper chords. The upper bolt balls are arranged at the joints. The upper chords have the ability to bear a certain vertical load, replacing the main purlins to undertake part of the support and load transfer functions. The lower chords of the second chord member assembly are arranged in a specific closed shape, and the lower bolt balls are arranged at the joints. The web member assembly connects the upper and lower bolt balls of the first and second chord member assemblies to enhance the overall stability of the structure. The purlin support assembly is located above the first chord member assembly and is connected to the adjacent transverse upper chords, directly supporting the roof system, realizing that the upper chords of the grid are used as the main purlins of the roof at the same time, simplifying the roof system. At the same time, considering the bending moment applied to the joints when the chords are bent, the bending and shear strength of the structure is improved. This system effectively reduces the structural complexity and material cost, simplifies the installation process, and improves the construction efficiency; avoids the space occupied by the main purlins, optimizes the space utilization; reduces the structural weight, reduces the requirement for the bearing capacity of the foundation, and is beneficial to energy conservation and environmental protection; and enhances the structural stability and bearing capacity by reasonably designing to improve the bending and shear strength of the structure.

[0035] The upper chord is provided with a reinforcement component. After the upper chord is subjected to shear force, the reinforcement component will share part of the acting force to achieve the anti-shear effect, thereby improving the bending strength of the grid, and solving the problem that the bolt ball joints in the prior art only consider the tensile force of the chords, resulting in low bending strength; only one-direction purlins are used, which simplifies the roof system, reduces the steel consumption, and is convenient for construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings in the following description are only the corresponding drawings of some embodiments of the present invention.

[0037] Figure 1 It is a schematic diagram of the overall structure of the preferred embodiment of the present invention.

[0038] Figure 2 It is a schematic diagram of the positive dialysis structure of the preferred embodiment of the present invention.

[0039] Figure 3 It is a schematic diagram of the upper bolt ball connection structure of the preferred embodiment of the present invention.

[0040] Figure 4 It is a schematic diagram of the purlin structure of the preferred embodiment of the present invention.

[0041] Figure 5 It is a schematic diagram of the purlin bracket structure of the preferred embodiment of the present invention.

[0042] Figure 6 It is a schematic diagram of the reinforcing rod connection structure of the preferred embodiment of the present invention.

[0043] Figure 7 It is a schematic diagram of the connection structure between the reinforcing rod and the screw of the preferred embodiment of the present invention.

[0044] Figure 8 It is a schematic diagram of the upper chord rod structure of the second embodiment of the present invention.

[0045] Figure 9 It is a three-dimensional view of the screw connection structure of the second embodiment of the present invention Figure 1 .

[0046] Figure 10 It is a three-dimensional view of the screw structure of the second embodiment of the present invention Figure 2 .

[0047] Figure 11 It is a schematic diagram of the connection structure between the screw and the sleeve of the second embodiment of the present invention.

[0048] Reference numerals: 11, first chord rod assembly; 111, upper chord rod; 1111, transverse upper chord rod; 1112, longitudinal upper chord rod; 1113, sealing plate; 112, upper bolt ball; 12, second chord rod assembly; 121, lower chord rod; 122, lower bolt ball; 13, web member assembly; 131, web member; 14, purlin bracket assembly; 141, purlin; 1411, second mounting hole; 142, purlin bracket; 1421, first mounting hole; 1422, arc-shaped bottom; 15, reinforcing assembly; 151, reinforcing rod; 152, reinforcing nut; 153, support block; 154, screw; 1541, second connecting portion; 1542, first connecting portion; 155, sleeve.

[0049] Second Embodiment: 254, screw; 2541, second connection part; 2542, first connection part; 255, sleeve; 2551, wear-resistant ceramic coating; 25421, receiving groove; 256, elastic tongue; 211, upper chord; 2114, support part; 2115, limiting part. Detailed Implementation Manner

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0051] In the figures, units with similar structures are denoted by the same reference numerals.

[0052] In the terms of the present invention, words such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance, nor as limiting the order of precedence.

[0053] Please refer to Figure 1 and Figure 2 where Figure 1 is the overall structural schematic diagram of the preferred embodiment of the present invention; Figure 2 is the front dialysis structural schematic diagram of the preferred embodiment of the present invention.

[0054] The following is a preferred embodiment of a grid structure main purlin-free roof space system provided by the present invention that can solve the above technical problems.

[0055] The preferred embodiment of the grid structure main purlin-free roof space system provided by the present invention is: A grid structure main purlin-free roof space system mainly includes a first chord assembly 11, a second chord assembly 12, a web member assembly 13, and a purlin support assembly 14. The first chord assembly 11 includes a plurality of upper chords 111 and upper bolt balls 112. The plurality of upper chords 111 includes at least two transverse upper chords 1111 and at least two longitudinal upper chords 111. The transverse upper chords 1111 are arranged along a first direction, the longitudinal upper chords 111 are arranged along a second direction, and the transverse upper chords 1111 and the longitudinal upper chords 111 are arranged in an alternating manner, arranged in a specific closed shape (such as a "mouth" shape), and the straight line where the second direction is located is perpendicular to the straight line where the first direction is located. The upper bolt balls 112 are arranged at the connection of the transverse upper chords 1111 and the longitudinal upper chords 111.

[0056] The second chord member assembly 12 is arranged below the first chord member assembly 11 and includes a plurality of lower chord members 121 and lower bolt balls 122. The plurality of lower chord members 121 are arranged in a specific closed shape (such as a "mouth" shape), and the lower bolt balls 122 are arranged at the joints of the plurality of lower chord members 121. The web member assembly 13 is arranged between the first chord member assembly 11 and the second chord member assembly 12. The top end of the web member assembly 13 is connected to the upper bolt ball 112, and the bottom end of the web member assembly 13 is connected to the lower bolt ball 122. As a key component connecting the first chord member assembly 11 and the second chord member assembly 12, the web member assembly 13 can transfer and disperse the forces of the upper and lower chord members 121, improving the lateral force resistance and deformation resistance of the entire roof system. The purlin support assembly 14 is located above the first chord member assembly 11, and the bottom end of the purlin support assembly 14 is connected to the adjacent horizontal upper chord member 1111 for supporting the roof system.

[0057] In the present invention, the main purlin 141 is removed, and the purlin 141 is directly built in the middle part of the upper chord member 111, simplifying the structure of the roof system, reducing the secondary purlins and only building the main purlins in one direction, greatly reducing the steel consumption, saving labor and material costs, and improving economic benefits.

[0058] The structure of the purlin support assembly 14 in this embodiment is elaborated in detail as follows:

[0059] Combined with Figure 2 and Figure 3 , the purlin support assembly 14 includes a purlin 141 and a purlin support 142. The purlin 141 is arranged above the horizontal upper chord member 1111, and the purlin 141 is used to support the roof system; the bottom end of the purlin support 142 is welded to the horizontal upper chord member 1111, and one side of the purlin support 142 is connected to the side of the purlin 141. The reasonable setting of the purlin 141 and the purlin support 142 can effectively transfer the roof load to the horizontal upper chord member 1111, ensuring the stability and safety of the roof system.

[0060] In this embodiment, the bottom of the purlin support 142 adopts an arc shape, which can be firmly welded in the upper chord member 111. The purlin support 142 is provided with a first mounting hole 1421, and the purlin 141 is fastened by conventional connecting pieces such as bolt groups.

[0061] Furthermore, during use, the type of the purlin 141 is a "C" shaped steel, and only the purlins 141 in one direction are built in the space frame, greatly reducing the steel consumption and saving labor. After the upper chord member 111 is subjected to shear force, the reinforcement rod 151 will share part of the acting force for the screw rod 154, achieving the effect of shear resistance, thereby improving the flexural strength of the bolt ball space frame and solving the problem in the prior art that the bolt ball joints only consider the tensile force of the chord members, resulting in low flexural strength. Only the purlins 141 in one direction are adopted, simplifying the roof system, reducing the steel consumption, and facilitating construction.

[0062] Furthermore, combined withFigure 1 The purlin support 142 is provided with a plurality of first mounting holes 1421. In this embodiment, the plurality of first mounting holes 1421 can be arranged in the vertical direction or the first mounting holes 1421 can be arranged in a slotted hole structure, which can realize the fine adjustment and fastening of the purlin 141 in the up and down directions, can adapt to different construction errors and installation requirements, and improves the installation accuracy and flexibility. Combined with Figure 4 , in this embodiment, 4 first mounting holes 1421 are opened at the position of the purlin support 1426 for connecting the purlin 141; as Figure 5 shown, the purlin support 1426 is provided with an arc-shaped bottom 1422, the bottom of the purlin support 1426 is welded to the upper chord 111 in an arc shape, the type of the purlin 1417 is "C" steel, 12 second mounting holes 1411 are opened in the purlin 1417 corresponding to the first mounting holes 1421, and a total of 6 purlin supports 142 and 2 purlins 141 are provided in this grid structure and are connected by bolts.

[0063] The internal structure of the upper chord 111 in this embodiment is described as follows:

[0064] Combined with Figure 2 and Figure 3 , the upper chord 111 in this embodiment is a hollow structure, a sealing plate 1113 is provided at the end of the upper chord 111, and reinforcing components 15 are respectively provided at both ends inside the upper chord 111. The reinforcing component 15 includes a reinforcing rod 151, a reinforcing nut 152 and a support block 153. The reinforcing rod 151 is arranged inside the upper chord 111, the reinforcing nut 152 is arranged on the reinforcing rod 151, and the reinforcing nut 152 abuts against the sealing plate 1113; the support block 153 is arranged at one end of the reinforcing rod 151, and the periphery of the support block 153 is attached to the inner wall of the upper chord 111. The hollow-structured upper chord 111 can reduce its own weight and material cost. The setting of the reinforcing component 15 can enhance the bearing capacity and anti-deformation ability of the upper chord 111. The synergistic effect of the reinforcing rod 151, the reinforcing nut 152 and the support block 153 enables the upper chord 111 to maintain the structural stability when subjected to external forces, and has a simple structure and low use cost.

[0065] Combined with Figure 5 and Figure 7 , in this embodiment, the support block 153 is preferably arranged in a disc structure, the periphery of the support block 153 is closely attached to the inner side wall of the upper chord 111, and it plays a role in sharing force under the shear force condition. The support block 153 can be integrally formed with the reinforcing rod 151 to improve the strength of the structure.

[0066] In this embodiment, the reinforcing rod 151 is arranged in a hollow tube structure. The hollow tube structure can reduce the self-weight and save costs, and the hollow tube structure has better bending and torsion resistance performance compared with the solid tube structure.

[0067] Furthermore, the sealing plate 1113 is provided with a through inner hole, and the other end of the reinforcing rod 151 passes through the inner hole and extends. The reinforcing assembly 15 further includes a screw rod 154. One end of the screw rod 154 is connected to the other end of the reinforcing rod 151, and the other end of the screw rod 154 is connected to the upper bolt ball 112. The design of setting the inner hole in the sealing plate 1113 facilitates the connection between the reinforcing rod 151 and the screw rod 154, enables the upper chord rod 111 to form a tight connection with other components of the entire roof system, and improves the integrity and cooperative working ability of the structure. In this embodiment, the diameter of the reinforcing rod 151 is greater than or equal to the diameter of the screw rod 154, and the reinforcing rod 151 and the screw rod 154 are preferably arranged on the same central axis to improve the shear strength and is beneficial to protecting the reinforcing rod 151.

[0068] In this embodiment, the reinforcing nut 152 abuts against the inner side surface of the sealing plate 1113, and the diameter of the reinforcing nut 152 is smaller than the diameter of the inner side surface of the sealing plate 1113. This structural design can increase the contact area, thereby increasing the stress area and the bending and tensile strength.

[0069] In this embodiment, the distance between the end face of the support block 153 and the sealing plate 1113 is greater than the length of the screw rod 154, which can improve the sensitivity and enable the bolt ball grid to play a sharing role when being sheared.

[0070] Combined Figure 2 and Figure 7 , the reinforcing assembly 15 in this embodiment further includes a sleeve 155. The screw rod 154 includes a first connecting portion 1542 and a second connecting portion 1541. The first connecting portion 1542 is located at the end of the reinforcing rod 151 away from the support block 153. The first connecting portion 1542 is provided with an external thread, and the first connecting portion 1542 is connected to the upper bolt ball 112. The second connecting portion 1541 is located between the first connecting portion 1542 and the reinforcing nut 152. The sleeve 155 is sleeved on the second connecting portion 1541, and one end of the sleeve 155 abuts against the upper bolt ball 112. The second connecting portion 1541 and the sleeve 155 are tightly connected by a pin. The settings of different connecting portions of the sleeve 155 and the reinforcing rod 151 further enhance the connection strength and stability between the reinforcing rod 151 and the upper bolt ball 112. The pin tight connection method can prevent relative rotation between the sleeve 155 and the reinforcing rod 151 and improves the reliability of the connection.

[0071] The following elaborates on other structures in this embodiment:

[0072] Combined Figure 1, in this embodiment, the form of the lower chord 121 is the same as that of the upper chord 111, and it is located below the upper chord 111 in space; the web member assembly 13 includes web members 131, the form of the web members 131 is the same as that of the upper chord 111, and they are connected by bolt balls between the upper chord 111 and the lower chord 121. In this embodiment, there are 12 upper chords 111 in total, arranged in a "field" shape, 4 lower chords 121 in total, arranged in a "square" shape, 16 web members 131 in total, used to connect the bolt balls 5 between the upper chord 111 and the lower chord 121, and there are 13 bolt balls 5 in total, and the members are connected pairwise by bolts 9.

[0073] Working principle of the present invention: (1) Prefabrication and processing

[0074] Make a flat cut on the bolt ball, and punch a fixing groove with a threaded hole inward in the middle of the cut, and the fixing groove is used to screw in the screw rod. The flat cut is convenient for complete contact with the cross-section of the sleeve 155 to achieve a sealed state.

[0075] Prepare members such as the upper chord 111, the lower chord 121, and the web member 131, ensure that the upper chord 111 is a hollow structure, process the structure for installing the sealing plate 1113 at the end, and reserve space for installing the reinforcement assembly 15 at both ends inside the upper chord 111.

[0076] Manufacture the reinforcement assembly 15, assemble the reinforcement rod 151 with the reinforcement nut 152 and the support block 153, and ensure that the circumferential side of the support block 153 fits well with the inner wall of the upper chord 111.

[0077] Manufacture the purlin support 142 and the purlin 141, process an arc-shaped bottom 1422 at the bottom of the purlin support 142, and the arc-shaped bottom 1422 is convenient for welding the purlin support 142 to the upper chord 111. Open the first installation hole 1421 on the purlin support 142 and open the corresponding second installation hole 1411 on the purlin 141.

[0078] (2) Assembly process

[0079] First, weld the reinforcement rod 151 at the reinforcement nut 152 of the screw rod 154, pass the screw rod 154 through the sealing plate 1113, and insert the reinforcement rod 151 flatly into the upper chord 111 and penetrate a set distance. In this embodiment, it is preferably to insert the support block 153 to one-third of the position inside the upper chord 111.

[0080] Weld the sealing plate 1113 to the upper chord 111 to connect the two into a whole.

[0081] Put a sleeve 155 on the end of the screw rod 154 away from the reinforcement nut 152, screw the screw rod 154 into the upper bolt ball 112, so that the first connection part 1542 is connected to the fixing groove of the upper bolt ball 112, and at the same time, fasten the second connection part 1541 to the sleeve 155 through a pin.

[0082] After completing the assembly of a single node according to the above steps, the assembly of the remaining nodes is carried out in sequence until the entire grid structure is completed.

[0083] Weld the purlin support 142 in the middle of the upper chord 111, then place the purlin 141 on the purlin support 142, and connect and fix the first mounting hole 1421 of the purlin support 142 and the second mounting hole 1411 of the purlin 141 through a bolt group to complete the construction of the roof system.

[0084] In this way, the installation process of the grid structure without main purlin roof space system of this preferred embodiment is completed.

[0085] During actual use, when the grid structure without main purlin roof space system is subjected to shear force, it is applied from the purlin 141 to the middle part of the upper chord 111. At this time, there are two force transmission sequences: the first force transmission sequence is the upper chord 111, the gusset plate 1113, the screw 154, the sleeve 155, and the upper bolt ball 112; the second force transmission sequence is the upper chord 111, the gusset plate 1113, the support block 153, the reinforcement rod 151, the screw 154, the sleeve 155, and the upper bolt ball 112. Since the screw 154 and the reinforcement assembly 15 welded on the reinforcement nut 152 can bear a part of the shear force, the overall shear resistance of the grid structure is greatly strengthened, ensuring the stability and safety of the structure.

[0086] A grid structure without main purlin roof space system of the present invention has one end of the reinforcement rod 151 welded to the reinforcement nut 152, and the other end of the reinforcement rod 151 is connected to the inner side wall of the middle cavity of the upper chord 111. The screw 154 is welded to the reinforcement rod 151 to form the main fixing piece. The grid structure without main purlin roof space system is mainly composed of such bolt ball nodes, which connect the upper chord 111 and the lower chord 121 through bolt balls. Since the upper chord 111 has certain bending and shear resistance performance, the purlin support 142 is built on the middle part of the upper chord 111, and the purlin 141 is stably built on the upper chord 111 through the purlin support 142, and the purlin support 142 is perpendicular to the upper chord 111. After the upper chord 111 is subjected to shear force, the reinforcement rod 151 will share part of the force for the screw 154, improving the shear resistance performance. Moreover, this grid structure without main purlins removes the main purlin bars compared with the ordinary grid, greatly reducing the steel consumption and making the installation more convenient.

[0087] The following provides the second implementation structure of this grid structure without main purlin roof space system:

[0088] Combined with Figure 8, on the basis of the first embodiment, the upper chord 211 includes a support portion 2114 and a limiting portion 2115. The support portion 2114 is located in the middle of the upper chord 211, and the limiting portion 2115 is located at the end of the upper chord 211. The inner wall diameter of the limiting portion 2115 gradually decreases near one end close to the support portion 2114, which can limit the position of the reinforcement component in the upper chord 211, prevent the reinforcement component from moving or shaking in the upper chord 211, improve the structural stability and reliability of the upper chord 211, and ensure the safe operation of the entire roof system.

[0089] Combined with Figure 9 and Figure 10 , the screw 254 includes a first connection portion 2542 and a second connection portion 2541. The first connection portion 2542 is located at the end of the reinforcement rod away from the support block. The first connection portion 2542 is provided with an external thread and is connected to the upper bolt ball. The second connection portion 2541 is located between the first connection portion 2542 and the reinforcement nut. The sleeve 255 is sleeved on the second connection portion 2541, and one end of the sleeve 255 abuts against the upper bolt ball. The second connection portion 2541 and the sleeve 255 are fixedly connected by a pin. On the basis of the first embodiment, the reinforcement component further includes an elastic tongue 256, and the elastic tongue 256 is connected to the outside of the second connection portion 2541 of the screw 254 and abuts against the inner wall of the sleeve 255. The arrangement of the elastic tongue 256 increases the connection reliability between the reinforcement component and the sleeve 255. The abutment of the elastic tongue 256 against the inner wall of the sleeve 255 can prevent the reinforcement rod from disengaging from the sleeve 255 when subjected to an external force, improving the anti-pulling ability and stability of the structure.

[0090] Furthermore, as Figure 10 shown, a receiving groove 25421 is provided on the outside of the second connection portion 2541, and the elastic tongue 256 is located in the receiving groove 25421. The arrangement of the receiving groove 25421 can keep the elastic tongue 256 in a contracted state when not under force, facilitating the installation and disassembly of the reinforcement rod. When subjected to an external force, the elastic tongue 256 can pop out and abut against the inner wall of the sleeve 255 to achieve a reliable connection.

[0091] Combined with Figure 11 , the inner wall of the sleeve 255 is provided with a stepped groove, and a wear-resistant ceramic coating 2551 is provided on its side. At least two elastic tongues 256 are circumferentially distributed on the second connection portion 2541, forming a self-locking anti-pulling structure with the stepped groove preset on the inner wall of the sleeve 255. The self-locking anti-pulling structure of the stepped groove and the elastic tongue 256 can further improve the connection strength between the reinforcement component and the sleeve 255, preventing the reinforcement rod from loosening or disengaging when subjected to a large external force. The arrangement of the wear-resistant ceramic coating 2551 can reduce the wear between the elastic tongue 256 and the inner wall of the sleeve 255 and extend the service life of the structure.

[0092] In summary, although the present invention has been disclosed above with preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those of ordinary skill in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A grid structure without main purlin roof space system, characterized in that: include: A first chord assembly, the first chord assembly comprising: A plurality of upper chords, the plurality of upper chords comprising at least two transverse upper chords and at least two longitudinal upper chords, at least two of the transverse upper chords being arranged along a first direction; at least two of the longitudinal upper chords being arranged along a second direction, the transverse upper chords and the longitudinal upper chords being arranged alternately and in a specific closed shape, and a straight line in which the second direction is located is perpendicular to a straight line in which the first direction is located; and An upper bolt ball is arranged at the connection between the upper horizontal chord and the upper vertical chord; A second chord assembly is disposed below the first chord assembly, wherein the second chord assembly comprises: A plurality of lower chords, wherein the plurality of lower chords are arranged in a specific closed shape; and A lower bolt ball, which is arranged at the connection of several lower chords; a web assembly, disposed between the first chord assembly and the second chord assembly, wherein the top end of the web assembly is connected to the upper bolt ball, and the bottom end of the web assembly is connected to the lower bolt ball; and The purlin support assembly is located above the first chord assembly, and the bottom end of the purlin support assembly is connected to the adjacent upper horizontal chord. The purlin support assembly is used to support the roof system.

2. The grid structure without main purlin roof space system according to claim 1 is characterized in that: The purlin support assembly comprises: A purlin is disposed above the upper horizontal chord, and the purlin is used to support the roof system; and Purlin support, the bottom end of the purlin support is welded to the upper horizontal chord, and one side of the purlin support is connected to the side of the purlin.

3. The grid structure without main purlin roof space system according to claim 1 is characterized in that: The upper chord rod is a hollow structure, a sealing plate is provided at the end of the upper chord rod, and reinforcement components are respectively provided at both ends of the upper chord rod; the reinforcement components include: A reinforcement rod, arranged in the upper chord rod; A reinforcing nut, disposed on the reinforcing rod, the reinforcing nut abutting against the sealing plate; and A support block is arranged at one end of the reinforcement rod, and the peripheral side of the support block is in contact with the inner wall of the upper chord rod.

4. The grid structure without main purlin roof space system according to claim 3 is characterized in that: The sealing plate is provided with a through inner hole, and the other end of the reinforcing rod passes through the inner hole and extends; The reinforcement assembly also includes a screw rod, one end of which is connected to the other end of the reinforcement rod, and the other end of the screw rod is connected to the upper bolt ball.

5. The grid structure without main purlin roof space system according to claim 4 is characterized in that: The reinforcement assembly also includes a sleeve: The screw includes: A first connection portion, located at an end of the reinforcement rod away from the support block, the first connection portion is provided with an external thread, and the first connection portion is ball-connected to the upper bolt; as well as The second connection part is located between the first connection part and the reinforcing nut. The sleeve is sleeved on the second connection part, and one end of the sleeve is in contact with the upper bolt ball. The second connection part is fastened to the sleeve by a pin.

6. The grid structure without main purlin roof space system according to claim 5 is characterized in that: The diameter of the reinforcing rod is greater than or equal to the diameter of the screw rod, and the reinforcing rod and the screw rod are arranged coaxially.

7. The grid structure without main purlin roof space system according to claim 5 is characterized in that: The reinforcement component also includes an elastic tongue, which is connected to the outer side of the second connecting portion and abuts against the inner wall of the sleeve.

8. The grid structure without main purlin roof space system according to claim 7 is characterized in that: A receiving groove is arranged on the outer side of the second connecting portion, and the elastic latch is located in the receiving groove.

9. The grid structure without main purlin roof space system according to claim 7 is characterized in that: The inner wall of the sleeve is provided with a stepped groove, and the side edge of the stepped groove is provided with a wear-resistant ceramic coating.

10. The grid structure without main purlin roof space system according to claim 1 is characterized in that: The upper chord comprises: A connecting portion located in the middle of the upper chord; and The limiting portion is located at the end of the upper chord rod, and the inner wall diameter of the limiting portion close to one end of the connecting portion gradually decreases.

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