Boom structure, boom system and crane

Abstract

The present disclosure relates to a boom structure, a boom system and a crane. The boom structure comprises: at least two layers of single boom sections (10a, 10b) which can be nested layer by layer according to the size of the cross-sectional caliber; and a connecting section (20) having connecting parts (24) for fixed connection with at least one end of each layer of single boom sections (10a, 10b) in the at least two layers of single boom sections (10a, 10b). In the reinforced use condition of the boom structure, the at least two layers of single boom sections (10a, 10b) are nested layer by layer, the connecting section (20) is arranged at the at least one end of the at least two layers of nested single boom sections (10a, 10b), and the connecting parts (24) of the connecting section (20) are fixedly connected with the end parts on the same side of each layer of single boom sections (10a, 10b). The embodiment of the present disclosure can meet the hoisting demand of overweight objects while improving the utilization rate of the boom for hoisting objects below the medium size.

Description

Technical Field

[0001] This disclosure relates to the field of construction machinery, and more particularly to a boom structure, boom system and crane. Background Technology

[0002] With the continuous optimization and upgrading of engineering applications, from a construction perspective, hoisting is increasingly emphasizing efficiency and safety. The prefabrication of large components on the ground and the integrated hoisting of petrochemical tanks are becoming increasingly popular. The continuous emergence of ultra-large and ultra-heavy equipment hoisting construction places greater and more demands on the capabilities of hoisting machinery. From a technical perspective, hoisting machinery is becoming increasingly large, placing higher demands on the load-bearing capacity of the entire machine's structural components, especially the boom system, which is a key load-bearing structural component. From an operational perspective, based on actual engineering projects, the proportion of ultra-heavy components hoisted is not very high; the vast majority of hoisting is for medium and smaller components. However, ultra-large cranes often face the problem of excessively high operating costs when hoisting medium and smaller components. Summary of the Invention

[0003] In view of this, the present disclosure provides a boom structure, boom system and crane that can improve the boom utilization rate for lifting medium and small components while meeting the lifting requirements of heavy-duty components.

[0004] In one aspect of this disclosure, a boom structure is provided, comprising:

[0005] At least two single-arm sections can be nested layer by layer according to the size of the cross-sectional diameter;

[0006] The connecting joint has a connecting portion for fixedly connecting to at least one end of each of the at least two single-arm sections.

[0007] In the reinforced use condition of the arm segment structure, the at least two single arm segments are nested layer by layer, and the connecting segment is disposed at at least one end of the at least two nested single arm segments, and the connecting part of the connecting segment is fixedly connected to the end of each single arm segment on the same side.

[0008] In some embodiments, the connecting portion includes at least two sets of connecting joints, and under reinforced operating conditions of the boom structure, the at least two sets of connecting joints are fixedly connected to the ends of the at least two single boom sections one by one by pins or bolts.

[0009] In some embodiments, the polygonal cross-sectional diameter formed by each set of connecting joints is the same as the cross-sectional diameter of the single-arm section of the corresponding layer.

[0010] In some embodiments, the connecting section further includes:

[0011] There are at least two sets of chords, each set of chords consisting of multiple chords arranged in parallel.

[0012] At least two sets of web members, each corresponding to one of the at least two sets of chord members, and each set of web members includes multiple web members;

[0013] At least one set of connecting rods connects adjacent sets of chords in the two sets of chords, and each set of connecting rods includes multiple connecting rods;

[0014] Wherein, at least one of the plurality of web members is disposed between two adjacent chord members among the plurality of chord members, and at least one of the plurality of connecting rods is disposed between two adjacent chord members in an adjacent group of chord members. The connecting part includes at least two sets of connecting joints, which correspond one-to-one with the at least two groups of chord members. Each set of connecting joints includes multiple connecting joints, and the multiple connecting joints correspond one-to-one with one end or both ends of the plurality of chord members.

[0015] In some embodiments, the boom structure further includes:

[0016] At least one set of lacing strips connects adjacent single arm segments in at least two layers of single arm segments.

[0017] In some embodiments, the arm structure further includes a transition section, wherein, in the case of the ultra-long arm of the arm structure, the at least two single arm sections are arranged sequentially along the length direction, and the opposite ends of adjacent single arm sections are fixedly connected by the transition section.

[0018] In some embodiments, when the crane is in the auxiliary boom mode, the at least two single boom sections include a first single boom section with a larger cross-sectional diameter and a second single boom section with a smaller cross-sectional diameter, which respectively assemble the main boom and auxiliary boom of the crane.

[0019] In some embodiments, the connecting section is fixedly connected to the end of the first single-arm section and / or the second single-arm section.

[0020] In some embodiments, the single arm section is a truss-type single arm section or a box-type single arm section.

[0021] In some embodiments, the single-arm segment includes a standard segment or a plurality of standard segments connected sequentially along the length direction.

[0022] In some embodiments, the standard sections included in each single-arm section have the same cross-sectional diameter.

[0023] In one aspect of this disclosure, a boom system is provided, including the aforementioned boom segment structure.

[0024] In some embodiments, the boom system includes two boom segments that, when used in enhanced operating conditions, form a parallel double boom structure or an A-frame double boom structure.

[0025] In some embodiments, the boom structure can be disassembled into multiple single boom sections that are mounted on at least two cranes as booms.

[0026] In one aspect of this disclosure, a crane is provided, comprising:

[0027] The aforementioned boom system;

[0028] At least two tracked vehicles are connected to the boom system.

[0029] In the first-tonnage lifting condition, the at least two tracked vehicles and the boom structure, which includes at least two nested single boom sections, are assembled into a single crane.

[0030] Under the second-tonnage lifting condition, the at least two tracked vehicles are assembled with the disassembled boom structure to form at least two cranes, the second tonnage being smaller than the first tonnage.

[0031] In one aspect of this disclosure, a crane is provided, comprising:

[0032] The aforementioned boom system;

[0033] The ring track base is connected to the boom system and has at least two sets of ring tracks;

[0034] In the case of lifting at the first ton, the ring rail base and the boom structure, which includes at least two layers of nested single boom sections, are assembled into a single crane.

[0035] Under the second-tonnage lifting condition, the ring rail base is disassembled into at least two sets of ring rails, and the at least two sets of ring rails are respectively assembled with the disassembled boom structure to form at least two cranes, wherein the second tonnage is less than the first tonnage.

[0036] Therefore, according to the embodiments of this disclosure, at least two layers of single boom sections are nested layer by layer in the reinforced use condition of the boom structure, and are fixedly connected at the ends of each layer of single boom sections on the same side by connecting sections. This nested boom structure improves the load-bearing capacity of the boom structure and has a compact structure, which is conducive to meeting the lifting requirements of heavy-duty parts. Moreover, in other working conditions, some or all of the single boom sections can be selected from at least two layers of single boom sections for use, thereby improving the boom utilization rate for lifting medium-sized parts and below. Attached Figure Description

[0037] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure.

[0038] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0039] Figure 1 These are structural schematic diagrams of some embodiments of the boom structure disclosed herein under enhanced operating conditions;

[0040] Figure 2 This is a schematic diagram of the connecting section in some embodiments of the boom structure according to this disclosure;

[0041] Figure 3 This is a cross-sectional schematic diagram of the connecting section corresponding to two single-arm sections in some embodiments of the boom structure according to this disclosure;

[0042] Figure 4 This is a cross-sectional schematic diagram of a connecting section corresponding to a three-layer single-arm section in some other embodiments of the boom structure according to this disclosure;

[0043] Figure 5 This is a structural schematic diagram of some embodiments of the boom structure disclosed herein under the working conditions of an ultra-long boom;

[0044] Figure 6 This is a structural schematic diagram of a crane in the auxiliary boom working condition, based on some embodiments of the boom structure disclosed herein.

[0045] It should be understood that the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Furthermore, the same or similar reference numerals denote the same or similar components. Detailed Implementation

[0046] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0047] The terms "first," "second," and similar words used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "above," "below," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0048] In this disclosure, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0049] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0050] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0051] Figure 1 This is a structural schematic diagram of some embodiments of the boom structure disclosed herein under enhanced operating conditions. Figure 2 This is a schematic diagram of the connecting section in some embodiments of the boom structure according to this disclosure. (Reference) Figure 1 and Figure 2 In some embodiments, the boom structure includes a connecting section 20 and at least two nested single boom sections in terms of cross-sectional diameter. The connecting section 20 has a connecting portion 24 for fixed connection to at least one end of each of the at least two single boom sections.

[0052] For example, in Figure 1 In this design, the boom structure includes two single-arm sections, namely single-arm section 10a and single-arm section 10b. The cross-sectional diameter of single-arm section 10b is smaller than that of single-arm section 10a, allowing single-arm section 10b to be inserted into the cavity of single-arm section 10a. Here, the cross-sectional diameter refers to the structural dimension of the single-arm section's cross-section perpendicular to its length, such as the size of its outer or inner contour cross-section. In other embodiments, the boom structure may include three or more single-arm sections, which can be nested layer by layer according to their respective cross-sectional diameters.

[0053] exist Figure 1 and Figure 2 As can be seen, the connecting part of the connecting section 20 can simultaneously form a fixed connection with each layer of single-arm section. This fixed connection can be a detachable connection achieved by pins or screws, or a non-detachable connection such as welding or bonding.

[0054] The boom structure of this embodiment can take different forms to meet usage requirements under various working conditions. When the boom structure needs to bear very high loads, i.e., in the case of reinforced boom segment usage, the at least two layers of single boom segments are nested layer by layer, and the connecting section 20 is located at at least one end of the at least two nested single boom segments, and the connecting part 24 of the connecting section 20 is fixedly connected to the end of each single boom segment on the same side. This nested and fixed structure can effectively improve the load-bearing capacity of the boom structure, and is more compact than the method of connecting multiple booms side by side in related technologies, which is beneficial to meeting the lifting needs of heavy-duty components. In other working conditions, selecting some or all of the single boom segments from the at least two layers can improve the boom utilization rate for lifting medium-sized components and below.

[0055] refer to Figure 1 In some embodiments, the single boom section is a truss-type single boom section, which can effectively reduce the weight of the boom structure. Figure 1 In this design, the truss-type single-arm section includes multiple main chord members 11 extending along the length of the single-arm section. Multiple connecting rods 12 can be provided between adjacent main chord members 11 to achieve a fixed connection between the main chord members 11. In other embodiments, the single-arm section is a box-type single-arm section, which can achieve good structural strength and stiffness. In still other embodiments, the single-arm sections in different layers can be truss-type single-arm sections and box-type single-arm sections, respectively.

[0056] exist Figure 1 In this design, both single-arm sections 10a and 10b include two standard sections, with the cross-sectional diameter of the two standard sections of single-arm section 10a being larger than that of the two standard sections of single-arm section 10b. In terms of length, the total length of the two standard sections of single-arm section 10a is equal to the total length of the two standard sections of single-arm section 10b. In some embodiments, a single-arm section may include one standard section or multiple standard sections connected sequentially along its length. The number of standard sections constituting a single-arm section can be selected based on the size of the standard sections and the actual working conditions. The number of standard sections included in single-arm sections of different layers can be the same or different.

[0057] For arm-joint structures with uniform cross-sections, refer to Figure 1 In some embodiments, the standard sections included in each layer of a single-arm section have the same cross-sectional diameter. However, for some non-uniform cross-section arm structures, a single-arm section may include multiple standard sections with different cross-sectional diameters. Standard sections with different cross-sectional diameters can be connected by transition sections. When nesting multiple layers of single-arm sections, standard sections with larger cross-sectional diameters are nested layer by layer, and standard sections with smaller cross-sectional diameters are also nested layer by layer.

[0058] refer to Figure 2In some embodiments, the connecting section 20 further includes: at least two sets of chord members 21, at least two sets of web members 22, and at least one set of connecting rods 23. Each set of chord members 21 includes a plurality of parallel chord members 21 extending along the length direction of the single arm section. The at least two sets of web members 22 correspond one-to-one with the at least two sets of chord members 21. Figure 2 In this configuration, each group of chords 21 comprises four chords 21, with each chord 21 positioned at one of the four corner points of a rectangle. Alternatively, the four chords 21 can be positioned at the corner points of a trapezoid, rhombus, or other shapes, depending on the requirements.

[0059] Each group of web members 22 includes multiple web members 22, which may be perpendicular to the chord members 21. At least one of the multiple web members 22 is disposed between two adjacent chord members 21, for example in... Figure 2 In this embodiment, two web members 22 are connected between two adjacent chord members 21. In other embodiments, a single web member or more web members may be connected between two adjacent chord members 21, and the width and thickness of the web members may be set as needed.

[0060] At least one set of connecting rods 23 connects adjacent sets of chords 21 in the two sets of chords 21, and each set of connecting rods 23 includes multiple connecting rods 23. At least one of the multiple connecting rods 23 is disposed between two adjacent chords 21 in the adjacent sets of chords 21. Figure 2 In this configuration, two connecting rods 23 are provided between two adjacent chord members 21. In some embodiments, a single connecting rod or more connecting rods may be provided between two adjacent chord members 21, and the width and thickness of the connecting rods may be set as needed.

[0061] The connecting part 24 includes at least two sets of connecting joints, each corresponding to one of the at least two sets of chord members 21. Each set of connecting joints includes multiple connecting joints, each corresponding to one or both ends of one or both ends of one or both of the multiple chord members 21. Figure 2 In this design, the connecting section 24 has two sets of connecting joints, each set comprising eight connecting joints, with each pair of connecting joints located at both ends of the chord 21 to which it is connected. This allows the connecting section 20 to connect not only two layers of single-arm sections on one side of the fixed connection, but also two layers of single-arm sections of other boom structures on the other side. This enables the sequential connection of multiple boom structures with a more stable and reliable effect. In other embodiments, the connecting joint can also be provided directly at one end of the chord 21.

[0062] In the aforementioned connecting sections, the chord members, web members, connecting rods, and connecting joints can be connected by welding or assembly.

[0063] Figure 3 This is a cross-sectional schematic diagram of the connecting section corresponding to two single-arm sections in some embodiments of the boom structure according to this disclosure. Figure 4This is a cross-sectional schematic diagram of a connecting section corresponding to a three-layer single-arm section in other embodiments of the boom structure according to this disclosure. Reference Figures 2-4 In some embodiments, the connecting portion 24 includes at least two sets of connecting joints. Under reinforced operating conditions of the arm segment structure, the at least two sets of connecting joints are fixedly connected to the ends of the at least two layers of single arm segments one by one by pins or bolts. Accordingly, the polygonal cross-sectional diameter formed by each set of connecting joints is the same as the cross-sectional diameter of the corresponding layer of single arm segments 10a and 10b, so as to more securely connect the different sets of connecting joints between each layer of single arm segments and the connecting segment.

[0064] refer to Figure 3 and Figure 4 The number of connecting joint groups included in the connecting part corresponds to the number of layers in a single boom section of the boom structure. Figure 3 In the middle, the connecting part includes two sets of connecting joints, while Figure 4 The connecting part includes three sets of connecting joints. Figure 3 In the middle, corresponding to the cross-sectional diameter positions of the two single-arm sections, the two sets of connecting joints are in the first direction (i.e. Figure 3 The vertical spacing relationship is H1>H2, while in the second direction (i.e., Figure 3 The horizontal spacing relationship is B1>B2.

[0065] By using connecting joints to fix the multi-layered single-arm sections together, the nested multi-layered single-arm sections become a load-bearing whole. To further improve overall integrity, in some embodiments, the boom structure also includes at least one set of lacing strips. At least one set of lacing strips can connect adjacent single-arm sections in at least two layers. For example, one or two sets of lacing strips can be provided between every two adjacent layers of single-arm sections to further strengthen the boom structure. For the arrangement of multiple sets of lacing strips, they can be spaced apart along the length of the single-arm section. In other embodiments, lacing strips can be provided in some adjacent layers of single-arm sections, while some adjacent layers of single-arm sections may not have lacing strips, to simplify assembly.

[0066] As mentioned earlier, the boom structure can take different forms to meet usage requirements under various working conditions. Figure 5 This is a structural schematic diagram of some embodiments of the boom structure disclosed herein under ultra-long boom operating conditions. (Reference) Figure 5 In some embodiments, the arm segment structure further includes a transition section 30. In the ultra-long arm operation of the arm segment structure, the at least two layers of single arm segments (e.g., single arm segment 10a and single arm segment 10b) are arranged sequentially along the length direction of the single arm segment, and the opposite ends of adjacent single arm segments (e.g., single arm segment 10a and single arm segment 10b) are fixedly connected by the transition section 30.

[0067] Compared to boom structures that include nested multi-layered single boom sections, when faced with situations requiring increased lifting height and working radius of the crane, operators can disassemble the multi-layered single boom sections used in reinforced operating conditions, and then connect single boom sections of different cross-sectional diameters through transition sections to obtain a longer boom structure.

[0068] Figure 6 This is a structural schematic diagram of a crane in the auxiliary boom working condition, based on some embodiments of the boom structure disclosed herein. (Reference) Figure 6 In some embodiments, when the crane is in the jib operation mode, the at least two single-arm sections include a first single-arm section with a larger cross-sectional diameter and a second single-arm section with a smaller cross-sectional diameter. The first and second single-arm sections are respectively assembled into the main boom A and the jib B of the crane, or respectively assembled into the main boom A and the jib B of the crane. This effectively improves the utilization rate of the boom structure and meets other small and medium-sized lifting extension needs.

[0069] In this structure, the connecting section 20 can be fixedly connected to the end of the first single-arm section, or fixedly connected to the end of the second single-arm section, or fixedly connected to both the end of the first single-arm section and the section of the second single-arm section.

[0070] The embodiments of the boom structure disclosed herein are applicable to boom systems used in various types of construction machinery. The boom system provided herein may include any of the aforementioned boom structure embodiments. The boom system can be expanded within a single crane to meet the needs of various crane operating conditions, and can also be expanded between multiple different cranes, for example, by nesting and reinforcing the booms of two different crane models to meet enhanced operating conditions. Accordingly, in some embodiments, the boom structure can be disassembled into multiple single boom sections that are installed on at least two cranes as booms; that is, the user can disassemble the boom structure of a single crane under enhanced operating conditions into multiple single boom sections and assemble them into the boom systems of multiple smaller tonnage cranes.

[0071] In some embodiments, the boom system includes two boom sections, which, under enhanced operating conditions, form a parallel double boom structure or an A-type double boom structure. That is, two sets of nested multi-layered single boom sections can be further combined into a parallel double boom structure or an A-type double boom structure to meet the requirements for lifting capacity of even larger and heavier loads. Compared to boom systems in related technologies, this system is more compact in structure and easier to install.

[0072] The aforementioned boom system can be applied to various types of construction machinery (such as cranes). Cranes may include cranes using tracked chassis or rail cranes (such as ring rail cranes). Therefore, this disclosure also provides a crane comprising: the aforementioned boom system and at least two tracked vehicles. The at least two tracked vehicles are connected to the boom system. The at least two tracked vehicles can be front and rear tracked vehicles or dual-tracked chassis.

[0073] Under the first-tonnage lifting condition, the at least two tracked vehicles are assembled with the boom structure, which includes at least two nested single boom sections, to form a single crane. Under the second-tonnage lifting condition, the at least two tracked vehicles are assembled with the disassembled boom structure to form at least two cranes, where the second-tonnage is smaller than the first-tonnage.

[0074] In other embodiments, this disclosure also provides a crane, including: the aforementioned boom system and a ring rail base connected to the boom system. The ring rail base has at least two sets of ring rails. These ring rails can be closed or open-circular tracks.

[0075] Under the first-tonnage lifting condition, the ring rail base is assembled with the boom structure, which includes at least two nested single boom sections, to form a single crane. Under the second-tonnage lifting condition, the ring rail base is disassembled into at least two sets of ring rails, and the at least two sets of ring rails are respectively assembled with the disassembled boom structure to form at least two cranes, wherein the second-tonnage is smaller than the first-tonnage.

[0076] The embodiments disclosed herein overcome the limitations of conventional boom reinforcement technology, fully utilizing the internal space of the boom section. This allows for increased boom system load-bearing capacity without increasing the overall external frame size, making assembly and disassembly of the boom system more convenient and efficient. The boom structure and system of this disclosure theoretically offer highly flexible adjustability in load-bearing capacity, with simple transformation and expansion, high component utilization, and great flexibility in disassembly and assembly. This meets the assembly requirements of boom sections for single or multiple cranes, ensuring the lifting of ultra-large components while simultaneously improving the overall operational economy for users.

[0077] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0078] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A boom structure, characterized in that, include: At least two single-arm sections (10a, 10b) can be nested in succession according to the size of the cross-sectional diameter. The connecting section (20) has a connecting portion (24) for fixedly connecting to at least one end of each of the at least two single-arm sections (10a, 10b). In the reinforced operating condition of the boom structure, the at least two layers of single boom sections (10a, 10b) are nested layer by layer, and the connecting section (20) is disposed at at least one end of the nested at least two layers of single boom sections (10a, 10b). The connecting part (24) of the connecting section (20) is fixedly connected to the end of each layer of single boom section (10a, 10b) on the same side. The connecting part (24) includes at least two sets of connecting joints. The number of connecting joints included in the connecting part (24) corresponds to the number of layers of single boom sections (10a, 10b) included in the boom structure. In the reinforced operating condition of the boom structure, the at least two sets of connecting joints are fixedly connected to the end of each of the at least two layers of single boom sections (10a, 10b). The connecting section (20) further includes: At least two sets of chords (21), each set of chords (21) includes multiple chords (21) arranged in parallel. Among them, the at least two sets of connecting joints correspond one-to-one with the at least two sets of chords (21), and each set of connecting joints includes multiple connecting joints, and the multiple connecting joints correspond one-to-one with one end or two ends of the multiple chords (21).

2. The boom structure according to claim 1, characterized in that, Under reinforced operating conditions of the boom structure, the at least two sets of connecting joints are fixedly connected to the ends of the at least two single boom sections (10a, 10b) one by one by pins or bolts.

3. The boom structure according to claim 2, characterized in that, The polygonal cross-sectional diameter formed by each set of connecting joints is the same as the cross-sectional diameter of the corresponding single-arm section (10a, 10b).

4. The boom structure according to claim 1, characterized in that, The connecting section (20) further includes: At least two sets of web members (22) correspond one-to-one with the at least two sets of chord members (21), and each set of web members (22) includes multiple web members (22). At least one set of connecting rods (23) is connected between adjacent sets of chords (21) in the two sets of chords (21), and each set of connecting rods (23) includes multiple connecting rods (23). Among them, at least one of the multiple web members (22) is disposed between two adjacent chord members (21) in the multiple chord members (21), and at least one of the multiple connecting rods (23) is disposed between two adjacent chord members (21) in adjacent groups of chord members (21).

5. The boom structure according to claim 1, characterized in that, Also includes: At least one set of lacing strips connects adjacent single arm segments (10a, 10b) in at least two layers of single arm segments (10a, 10b).

6. The boom structure according to claim 1, characterized in that, It also includes a transition section (30), wherein, in the case of the ultra-long boom of the boom structure, the at least two single boom sections (10a, 10b) are arranged sequentially along the length direction, and the opposite ends of adjacent single boom sections (10a, 10b) are fixedly connected through the transition section (30).

7. The boom structure according to claim 1, characterized in that, In the auxiliary boom operation of the crane, the at least two single boom sections (10a, 10b) include a first single boom section with a larger cross-sectional diameter and a second single boom section with a smaller cross-sectional diameter, which are respectively assembled into the main boom (A) and auxiliary boom (B) of the crane, or respectively assembled into the main boom (A) and auxiliary boom (B) of the crane.

8. The boom structure according to claim 7, characterized in that, The connecting section (20) is fixedly connected to the end of the first single arm section and / or the second single arm section.

9. The boom structure according to any one of claims 1 to 8, characterized in that, The single-arm section (10a, 10b) is a truss-type single-arm section or a box-type single-arm section.

10. The boom structure according to any one of claims 1 to 5, characterized in that, The single-arm section (10a, 10b) includes a standard section or multiple standard sections connected sequentially along the length direction.

11. The boom structure according to claim 10, characterized in that, Each single-arm section (10a, 10b) includes standard sections with the same cross-sectional diameter.

12. A boom system, characterized in that, include: At least one boom structure as described in any one of claims 1 to 11.

13. The boom system according to claim 12, characterized in that, The boom system includes two boom structures, which, under enhanced operating conditions, form a parallel double boom structure or an A-type double boom structure.

14. The boom system according to claim 12, characterized in that, The boom structure can be disassembled into multiple single boom sections (10a, 10b) that are mounted on at least two cranes as booms.

15. A crane, characterized in that, include: The boom system of claim 12; At least two tracked vehicles are connected to the boom system. In the first-tonnage lifting condition, the at least two tracked vehicles and the boom structure comprising at least two nested single boom sections (10a, 10b) are assembled into a single crane. In the second-tonnage lifting condition, the at least two tracked vehicles are assembled with the disassembled boom structure to form at least two cranes, the second tonnage being smaller than the first tonnage.

16. A crane, characterized in that, include: The boom system of claim 12; The ring track base is connected to the boom system and has at least two sets of ring tracks; In the first-tonnage lifting condition, the ring rail base and the boom structure, which includes at least two nested single boom sections (10a, 10b), are assembled into a single crane. Under the second-tonnage lifting condition, the ring rail base is disassembled into at least two sets of ring rails, and the at least two sets of ring rails are respectively assembled with the disassembled boom structure to form at least two cranes, wherein the second tonnage is less than the first tonnage.

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