A bracket-crane truss structure

Abstract

This utility model relates to a bracket-crane truss structure, comprising an upper chord, a web member assembly, and a lower chord. The lower chord has an I-shaped cross-section, and the web member assembly includes multiple diagonal web members and multiple vertical web members. The connection nodes between the upper chord and the web member assembly are used to connect corresponding roof beams; or the connection nodes between the upper chord and the web member assembly are used to connect the upper chord of the roof truss, and at least a portion of the vertical web members are used to connect the lower chord of the roof truss. Two crane beams are provided on both sides of the lower chord. Multiple intermediate brackets are connected to the bottom of the lower chord, and the lower flange plates of the crane beams are connected to the intermediate brackets. An upper connecting plate is connected between the upper flange plate of the crane beam and the upper flange plate of the lower chord, and a lower connecting plate is connected between the lower flange plate of the crane beam and the lower flange plate of the lower chord. This utility model can solve the problems of existing ultra-large span crane beams having large cross-sectional heights, occupying a large amount of space below the rail surface, affecting air circulation inside the workshop, having complex stress, large steel consumption, and inconvenient installation.

Description

Technical Field

[0001] This utility model relates to the field of industrial building technology, and in particular to a bracket-crane truss structure. Background Technology

[0002] There are two common traditional crane beam arrangements: one uses a solid-web crane beam structure, and the other uses a crane truss structure combining crane beams and trusses. However, both structures are placed below the crane rail surface, occupying the space below the rail surface, and both have some drawbacks.

[0003] For solid-web crane beam structures, when the process layout requires an increase in the span of the crane beam, the cross-sectional height of the crane beam is generally increased, which will occupy the usable space below the crane rail surface. When the span of the crane beam exceeds 36m, especially exceeding 48m, increasing the cross-sectional height of the crane beam becomes uneconomical. This large cross-section crane beam is similar to a 5m to 6m "high wall", occupying the clearance below the crane rail surface, which restricts the process layout to a certain extent. Moreover, this "high wall" also affects the air circulation in the workshop and the heat dissipation of high-temperature products.

[0004] For crane truss structures combining crane beams and trusses, achieving large spans using crane trusses is extremely difficult due to the fact that crane truss spans generally do not exceed 36m. If the span reaches 50m, 60m, or even 100m or more, it becomes very challenging. There are two main reasons for this: First, once the rail surface elevation is determined, the clearance below the crane truss is limited, preventing the truss height from increasing proportionally with the span increase after column removal, resulting in excessively large truss chord sections. Second, because the lower chord of the truss is under tension, the internal forces in the web members are large, and the fatigue strength at the nodes between the web members and the chord members is low. When the crane truss span is extremely large, using conventional crane trusses is very uneconomical and lacks practical application value.

[0005] Currently, some improved crane truss structures combining crane beams and trusses have emerged, allowing the truss to utilize the space above the crane rails and reduce the space occupied below the rails, but some shortcomings still exist.

[0006] For example, patent CN217676413U discloses a large-span crane truss structure. This patent features a W-shaped arrangement of web members with no vertical web members; the lower chord is a monolithic box-section; and the upper chord is a uniform cross-section. However, this patent has the following drawbacks:

[0007] (1) The web members of this patent are arranged in a W-shape and there are no vertical web members, which makes it difficult to connect the middle roof beam (or roof truss) with the upper chord, especially when the middle is a roof truss, the lower chord of the roof truss has no fixed position;

[0008] (2) Since the lower chord of this patent is an integral box section, it is often impossible to weld during the welding process due to the closed characteristics of the section, or the welding quality cannot meet the requirements; secondly, the flange of the box section is generally thick, and the middle part contributes less to the strength of the component, and the amount of steel used is large; thirdly, since the lower chord is a closed section, there are many hidden welds when dealing with the connection node plate between the web members and the lower chord, which affects the welding quality.

[0009] (3) The upper chord of this patent is a uniform cross section, and the influence of internal force changes on the cross section is not considered. The cross section size is not adjusted according to the internal force changes, resulting in material waste. In addition, the upper chord end section is generally a stress-free component, and the use of the same cross section as the middle section results in waste.

[0010] For example, patent CN220264985U discloses a crane truss and factory structure, which describes the connection method between the web members of the crane truss and the lower chord box-shaped section; in this patent, the web members extend two vertical node plates and connect with two transverse diaphragms within the lower chord box-shaped section. However, this patent has the following drawbacks:

[0011] (1) The lower chord of this patent is an integral box-shaped section. When welding the transverse diaphragm inside the box-shaped section, there are many hidden welds, which cannot guarantee the welding quality.

[0012] (2) The lower chord of this patent is a complete box-shaped cross-section, which makes it difficult to pass through and makes it impossible to arrange process pipelines;

[0013] (3) Since the lower chord is a closed section, when the web member extends two vertical plates into the box section, multiple closed cavities are formed in the lower chord node area. These closed cavities form many hidden welds, which affect the welding quality.

[0014] In view of this, based on years of experience in production and design in this and related fields, the inventor has designed a bracket-crane truss structure through repeated experiments in order to solve at least some of the problems existing in the prior art. Utility Model Content

[0015] The purpose of this utility model is to provide a bracket-crane truss structure that can solve the problems of existing ultra-large span crane beams having large cross-sectional heights, occupying a lot of space below the rail surface, affecting air circulation inside the workshop, having complex stress, using a large amount of steel, and being inconvenient to install.

[0016] The purpose of this utility model is achieved as follows: a bracket-crane truss structure includes an upper chord, a web member assembly, and a lower chord connected sequentially from top to bottom; the lower chord has an I-shaped cross-section, and the web member assembly includes multiple diagonal web members and multiple vertical web members connected between the upper chord and the lower chord; the connection node between the upper chord and the web member assembly is used to connect the corresponding roof beam; or the connection node between the upper chord and the web member assembly is used to connect the upper chord of the roof truss, and at least a portion of the vertical web members are used to connect the lower chord of the roof truss; in the lower chord... Two crane beams are provided on both sides in parallel and symmetrical arrangement. The crane beams have an I-shaped cross-section. The top surface of the upper flange plate of the crane beam is used to install the crane rail. Multiple intermediate brackets are connected at intervals along the length of the lower chord. The lower flange plate of the crane beam is connected to the intermediate brackets. The two ends of the crane beam and the two ends of the lower chord are used to connect the corresponding factory building brackets. An upper connecting plate is connected between the upper flange plate of the crane beam and the upper flange plate of the lower chord. A lower connecting plate is connected between the lower flange plate of the crane beam and the lower flange plate of the lower chord.

[0017] In a preferred embodiment of the present invention, each crane beam is connected to an upper connecting plate and multiple lower connecting plates, and each lower connecting plate is disposed between two adjacent intermediate brackets or between a factory bracket and a corresponding intermediate bracket.

[0018] In a preferred embodiment of this utility model, the thicknesses of the upper flange plate of the lower chord, the lower flange plate of the lower chord, the upper flange plate of the crane beam, and the lower flange plate of the crane beam are all equal and greater than the thicknesses of the upper connecting plate and the lower connecting plate.

[0019] In a preferred embodiment of this utility model, the upper connecting plate is fixed to the upper flange plate of the crane beam and the upper flange plate of the lower chord by welding, or connected by high-strength bolts, or a combination of high-strength bolts and welding; the lower connecting plate is fixed to the lower flange plate of the crane beam and the lower flange plate of the lower chord by welding, or connected by high-strength bolts, or a combination of high-strength bolts and welding.

[0020] In a preferred embodiment of this utility model, the intermediate corbel has an I-shaped cross-section, and the upper flange plate of the intermediate corbel is fixed to the lower flange plate of the lower chord and the lower flange plate of the crane beam by welding, or by high-strength bolts, or by a combination of high-strength bolts and welding.

[0021] In a preferred embodiment of this utility model, stiffening plates are provided on both sides of the web plate of the middle corbel, directly opposite the web plate of the lower chord.

[0022] In a preferred embodiment of the present invention, each crane beam is a multi-span continuous beam; or each crane beam includes multiple single-span crane beams, and the end of each single-span crane beam is connected to a corresponding intermediate bracket or a corresponding factory building bracket.

[0023] In a preferred embodiment of this utility model, the height between the top surface of the crane beam and the bottom surface of the intermediate corbel is 2m-2.5m.

[0024] In a preferred embodiment of this utility model, multiple node plates are provided on both the upper chord and the lower chord. The two ends of the diagonal web members are fixed to the corresponding node plates by welding, or by high-strength bolts, or by a combination of high-strength bolts and welding. The two ends of the vertical web members are fixed to the corresponding node plates by welding, or by high-strength bolts, or by a combination of high-strength bolts and welding.

[0025] In a preferred embodiment of this utility model, the number of vertical braces is the same as the number of intermediate corbels. Multiple vertical braces are respectively located directly above multiple intermediate corbels. A diagonal brace or two diagonal braces arranged in a cross pattern are provided between two adjacent vertical braces. The ends of a portion of the vertical braces are connected to the ends of one or two adjacent diagonal braces to the same node plate.

[0026] In a preferred embodiment of this utility model, the upper chord, the diagonal web members, and the vertical web members have H-shaped or box-shaped cross sections.

[0027] In a preferred embodiment of this utility model, the upper chord includes an intermediate chord and two connecting rods. The first end of the connecting rod is connected to the corresponding end of the intermediate chord, and the second end of the connecting rod is used to connect to the corresponding upper column of the factory building. The cross-sectional area of ​​the connecting rod is smaller than that of the intermediate chord.

[0028] As described above, the bracket-crane truss structure of this utility model adopts a structural design combining a load-bearing truss and a crane beam. The upper chord and web members of the load-bearing truss are all located above the rail surface, allowing the entire load-bearing truss to meet large span requirements. Furthermore, since the upper chord and web members occupy space above the rail surface, only the lower chord, intermediate brackets, and crane beam are located below the rail surface. The entire bracket-crane truss structure occupies minimal space below the crane rail surface, fully satisfying process layout requirements. The height of the entire bracket-crane truss structure is not limited by the clearance below the crane rail surface, allowing for a higher truss structure height, which brings significant economic advantages to the crane truss. It also solves the problem of existing ultra-large span crane beams having large cross-sectional heights, occupying significant lower space, and affecting air circulation within the workshop. Meanwhile, the lower chord, two crane beams, upper plate, and lower plate together form a box-shaped section, resulting in a more stable structure. Compared to existing structures that directly use a closed, integral box-shaped section, this design facilitates welding and reduces the number of concealed welds. Furthermore, this structural system integrates roof brackets and upper column supports, replacing some of the roof brackets and upper column supports in the factory building. The overall system exhibits excellent load-bearing performance. The entire bracket-crane truss structure is simple in construction, with clearly defined stress distribution, saving on steel consumption. In addition, the upper chord, diagonal web members, vertical web members, lower chord, crane beams, upper plate, lower plate, and intermediate corbel can be manufactured modularly, facilitating processing, transportation, and installation. Attached Figure Description

[0029] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0030] Figure 1 An elevation view of the bracket-crane truss structure provided by this utility model.

[0031] Figure 2 for Figure 1 In the cross-sectional view of AA.

[0032] Figure 3 for Figure 1 In the cross-sectional view of BB.

[0033] Figure 4 for Figure 1 Cross-sectional view of CC.

[0034] Figure 5 for Figure 1 In the cross-sectional view of DD.

[0035] Figure 6 This is a schematic diagram of a crane beam provided by this utility model when it is arranged in a single-span configuration.

[0036] Figure 7A schematic diagram of the bracket-crane truss structure provided by this utility model, arranged with 3 sections.

[0037] Figure 8 Another schematic diagram of the bracket-crane truss structure provided by this utility model, arranged with 3 sections.

[0038] Figure 9 A schematic diagram of the bracket-crane truss structure provided by this utility model, arranged with 5 sections.

[0039] Figure 10 Another schematic diagram of the bracket-crane truss structure provided by this utility model, arranged with 5 sections.

[0040] Explanation of icon numbers:

[0041] 1. Crane beam; 11. Crane rail; 12. Single-span crane beam;

[0042] 2. Lower chord;

[0043] 3. Top chord; 31. Intermediate chord; 32. Connecting rod;

[0044] 4. Diagonal web members;

[0045] 5. Vertical web members;

[0046] 6. Middle corbel; 61. Stiffening plate;

[0047] 71. Upper connecting plate; 72. Lower connecting plate;

[0048] 8. Roof beams;

[0049] 9. Factory building columns; 91. Upper columns of the factory building; 92. Lower columns of the factory building; 93. Factory building corbels;

[0050] H1, ground location; H2, rail surface elevation; H3, roof elevation. Detailed Implementation

[0051] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0052] like Figures 1 to 10As shown, this application provides a bracket-crane truss structure, including an upper chord 3, a web member assembly, and a lower chord 2 connected sequentially from top to bottom; the lower chord 2 has an I-shaped cross-section, and the web member assembly includes multiple diagonal web members 4 and multiple vertical web members 5 connected between the upper chord 3 and the lower chord 2; the connection node between the upper chord 3 and the web member assembly is used to connect the corresponding roof beam 8; or the connection node between the upper chord 3 and the web member assembly is used to connect the upper chord of the roof truss, and at least a portion of the vertical web members 5 are used to connect the lower chord of the roof truss; the lower chord 2 is parallel and spaced apart on both sides. Two crane beams 1 are provided, each with an I-shaped cross-section. The top surface of the upper flange of the crane beam 1 is used to install crane rails 11. Multiple intermediate brackets 6 are connected at intervals along the length of the lower chord 2 at the bottom. The lower flange of the crane beam 1 is connected to the intermediate brackets 6. The two ends of the crane beam 1 and the two ends of the lower chord 2 are used to connect the corresponding factory building brackets 93. An upper connecting plate 71 is connected between the upper flange of the crane beam 1 and the upper flange of the lower chord 2, and a lower connecting plate 72 is connected between the lower flange of the crane beam 1 and the lower flange of the lower chord 2.

[0053] The entire bracket-crane truss structure is installed between two factory building columns 9. The factory building columns 9 include an upper factory building column 91 and a lower factory building column 92, which are connected by a factory building bracket 93 (e.g., by welding). Generally, the upper factory building column 91 adopts an I-shaped cross section, while the lower factory building column 92 can adopt a round steel pipe or an I-shaped cross section. The length direction of the upper chord 3 is parallel to the length direction of the lower chord 2, and the upper chord 3 is located directly above the lower chord 2. The length direction of the crane beam 1 is parallel to the length direction of the lower chord 2. The web of the lower chord 2 is parallel to the web of the crane beam 1 and is vertically set. The upper connecting plate 71 and the lower connecting plate 72 are both horizontal plates. The length direction of the vertical web members 5 is vertically set, and the length direction of the diagonal web members 4 is inclined. The crane beam 1 is supported at both ends on and connected to the two factory building brackets 93. The lower chord 2 is also supported at both ends on and connected to the two factory building brackets 93. The middle part of the crane beam 1 and the middle part of the lower chord 2 are supported on and connected to the intermediate bracket 6. The crane beam 1 serves as a support for the crane rail, supporting the longitudinal movement of the crane.

[0054] The entire bracket-crane truss structure is a combination of a load-bearing truss and crane beams 1. The load-bearing truss includes an upper chord 3, web members, a lower chord 2, an intermediate corbel 6, an upper connecting plate 71, and a lower connecting plate 72. The upper chord 3 and the lower chord 2 are connected by the web members, and the three together form the main body of the load-bearing truss. The lower chord 2 has an I-shaped cross-section, and two rows of crane beams 1 are arranged on both sides of the lower chord 2. The upper flange of the crane beam 1 is connected to the upper flange of the lower chord 2 by the upper connecting plate 71, and the lower flange of the crane beam 1 is connected to the lower flange of the lower chord 2 by the lower connecting plate 72. The lower chord 2, the two crane beams 1, the upper connecting plate 71, and the lower connecting plate 72 together form a box-shaped cross-section, making the structure more stable. The intersection of the upper chord 3 and the web members of the load-bearing truss is used to connect the roof beam 8 (or the upper chord of the roof truss), and can bear the roof load transmitted from the roof beam 8 (or roof truss). The roof beam 8 (or roof truss) can then serve as lateral support for the upper chord 3. When the upper chord 3 is connected to the upper chord of the roof truss, the lower chord of the roof truss can be connected to the vertical web members 5. For traditional crane beam structures using solid web or crane truss structures combining crane beams and trusses, which are arranged below the crane rail surface, these traditional structures require separate roof brackets to bear the roof load transmitted from the roof beam 8 (or roof truss). To maintain longitudinal stability, the longitudinal force system of the factory building needs to be equipped with upper column supports and inter-column supports. In the structure of this application, the upper chord 3 is used to connect the upper chord of the roof beam 8 or roof truss, and the vertical web members 5 can be used to connect the lower chord of the roof truss. The entire bracket-crane truss structure can replace part of the roof bracket of the factory building, and the web member assembly can replace part of the upper column support of the factory building.

[0055] The box-shaped section formed by the lower chord 2 and the two crane beams 1 bears the roof load and crane load as a whole. The lower chord 2 and the crane beams 1 jointly participate in the truss stress. In terms of stress, the roof load transmitted from the roof beams 8 or the roof truss is transmitted to the main load-bearing truss composed of the upper chord 3, the web members, and the lower chord 2 through the node plates on the upper chord 3, and then transmitted to the ground through the factory corbels 93 and the lower columns 92 at both ends. At the same time, the crane load transmitted from the crane is transmitted to the intermediate corbels 6 through the crane beams 1, and then to the main load-bearing truss composed of the upper chord 3, the web members, and the lower chord 2, and then transmitted to the ground through the factory corbels 93 and the lower columns 92 at both ends. The stress is clearly defined.

[0056] Therefore, the bracket-crane truss structure of this application adopts a structural design combining a load-bearing truss and a crane beam 1. The upper chord 3 and web members of the load-bearing truss are all located above the rail surface, allowing the entire load-bearing truss to meet large span requirements. Furthermore, the upper chord 3 and web members occupy space above the rail surface, with only the lower chord 2, intermediate corbel 6, and crane beam 1 located below the rail surface. The entire bracket-crane truss structure occupies less space below the crane rail surface, fully meeting the process layout requirements. The height of the entire bracket-crane truss structure is not limited by the clearance below the crane rail surface, allowing for a higher truss structure height, which brings significant economic advantages to the crane truss. It also solves the problem that existing ultra-large span crane beams have large cross-sectional heights, occupy a lot of lower space, and affect the air circulation inside the workshop. Meanwhile, the lower chord 2, the two crane beams 1, the upper connecting plate 71, and the lower connecting plate 72 together form a box-shaped section, making the structure more stable. Compared with the existing directly closed integral box-shaped section, it is easier to operate when welding and can reduce hidden welds. Moreover, this structural system integrates the roof bracket and the upper column support, which can replace part of the roof bracket and part of the upper column support of the factory building. The overall system has good load-bearing performance. The entire bracket-crane truss structure is simple in construction, with clear stress and saves steel. In addition, the upper chord 3, the diagonal web members 4, the vertical web members 5, the lower chord 2, the crane beam 1, the upper connecting plate 71, the lower connecting plate 72, and the intermediate bracket 6 can be manufactured separately in a modular fashion, which is more convenient for processing, transportation, and installation.

[0057] It should be noted that "multiple" in this article refers to at least two, and "ultra-large span" in this article refers to a crane truss span of 36m or more. Of course, the specific definition of "ultra-large span" is based on the range known in the industry.

[0058] In a specific implementation, each crane beam 1 is connected to an upper connecting plate 71 and multiple lower connecting plates 72. Each lower connecting plate 72 is located between two adjacent intermediate brackets 6 or between the factory bracket 93 and the corresponding intermediate bracket 6.

[0059] Connecting a single upper plate 71 between the upper flange of the lower chord 2 and the corresponding upper flange of the crane beam 1 improves overall integrity. Due to the multiple intermediate brackets 6, multiple small lower plates 72 are used. Each lower plate 72 connects between the lower flange of the lower chord 2 and the corresponding lower flange of the crane beam 1, and is located between two adjacent intermediate brackets 6 or between the plant bracket 93 and the intermediate brackets 6. Generally, the length of the lower plate 72 matches the interval between two adjacent intermediate brackets 6 or the interval between the plant bracket 93 and the intermediate brackets 6, to improve overall stress distribution.

[0060] Alternatively, the thickness of the upper flange plate of the lower chord 2, the thickness of the lower flange plate of the lower chord 2, the thickness of the upper flange plate of the crane beam 1, and the thickness of the lower flange plate of the crane beam 1 are all equal and greater than the thickness of the upper connecting plate 71 and the thickness of the lower connecting plate 72.

[0061] The upper connecting plate 71 and the lower connecting plate 72 are generally made of thin steel plates, with a thickness approximately half that of the upper flange plate of the lower chord 2. Generally, the thickness of the upper flange plate of the lower chord 2 is 20mm-30mm, and the thickness of the upper connecting plate 71 and the lower connecting plate 72 is 10mm-15mm.

[0062] From a stress analysis perspective, the flange plate near the web member connection contributes significantly to the strength of the component, while the upper plate 71 and lower plate 72 located between the crane beam 1 and the lower chord 2 contribute less to the strength of the component. Therefore, both the upper plate 71 and the lower plate 72 are made of thin plates, which can reduce the amount of steel used and reduce material waste.

[0063] Different connection methods can be used between the upper plate 71 and the upper flange plate of the crane beam 1, between the upper plate 71 and the upper flange plate of the lower chord 2, between the lower plate 72 and the lower flange plate of the crane beam 1, and between the lower plate 72 and the lower flange plate of the lower chord 2, such as welding, high-strength bolt connection, high-strength bolt connection and welding hybrid connection.

[0064] The length direction of the aforementioned intermediate bracket 6 is perpendicular to the length direction of the lower chord 2. Generally, the intermediate bracket 6 adopts an I-shaped cross-section, and the web of the intermediate bracket 6 is vertically set and perpendicular to the web of the lower chord 2. Different connection methods can be used between the upper flange plate of the intermediate bracket 6 and the lower flange plate of the lower chord 2, as well as between the upper flange plate of the intermediate bracket 6 and the lower flange plate of the crane beam 1, such as welding, high-strength bolt connection, high-strength bolt connection, and welding hybrid connection.

[0065] Optional, refer to Figure 4 Stiffening plates 61 are provided on both sides of the web of the middle corbel 6, directly opposite the web of the lower chord 2. The surface of the stiffening plate 61 is parallel to the web of the lower chord 2 and located directly below the web of the lower chord 2 to improve the structural strength.

[0066] As required, each crane beam 1 is a multi-span continuous beam (e.g. Figures 1 to 3 (as shown); or each crane beam 1 includes multiple single-span crane beams 12 (as shown). Figure 6 As shown, the end of each single-span crane beam 12 is connected to the corresponding intermediate bracket 6 or the corresponding factory building bracket 93. That is, the crane beam 1 can be designed as a multi-span continuous beam or as a single-span crane beam 12. The multi-span continuous beam design provides better overall integrity, while the single-span crane beam 12 design facilitates transportation and assembly.

[0067] Ground position H1, rail surface elevation H2, and roof elevation H3 are as follows Figure 1 As shown, since the load-bearing truss in the entire bracket-crane truss structure mainly occupies the space above the crane rail surface, the space occupied below the crane rail surface can be smaller. Generally, the height between the top surface of the crane beam 1 and the bottom surface of the intermediate corbel 6 is 2m-2.5m, which can meet the requirements of stress and installation.

[0068] Furthermore, to facilitate the connection between each web member and the upper chord 3 and the lower chord 2, multiple node plates are provided on both the upper chord 3 and the lower chord 2. The two ends of the diagonal web member 4 are connected to the corresponding node plates on the upper chord 3 and the lower chord 2, respectively. The two ends of the vertical web member 5 are connected to the corresponding node plates on the upper chord 3 and the lower chord 2, respectively.

[0069] The ends of the diagonal web members 4 and the corresponding node plates, as well as the ends of the vertical web members 5 and the corresponding node plates, can be connected by different methods such as welding, high-strength bolts (such as friction-type high-strength bolts), high-strength bolt connections, and mixed welding connections.

[0070] In practical applications, the number of vertical bracing members 5 is the same as the number of intermediate corbels 6. Multiple vertical bracing members 5 are positioned directly above multiple intermediate corbels 6, meaning each intermediate corbel 6 is located at the bottom of the intersection point between the lower chord 2 and each vertical bracing member 5. Generally, a diagonal bracing member 4 is provided between two adjacent vertical bracing members 5, or two diagonal bracing members 4 are arranged in a crisscross pattern between two adjacent vertical bracing members 5. A diagonal bracing member 4 is provided between the two vertical bracing members 5 near the ends of the lower chord 2 and their corresponding ends, and the lower end of this diagonal bracing member 4 is connected to the node plate at the end of the lower chord 2. The ends of some vertical bracing members 5 are connected to the ends of two adjacent diagonal bracing members 4 to the same node plate, and / or the ends of some vertical bracing members 5 are connected to the end of one of the adjacent diagonal bracing members 4 to the same node plate. Some vertical bracing members 5 are individually connected to a node plate. The specific connection arrangement can be determined according to the actual situation.

[0071] The number of bays in the entire bracket-crane truss structure is not limited to 4 sections; it can also be designed with 2, 3, 5, 6, or 7 sections, etc. The number of bays is equal to the number of spans. Typical bay diagrams are shown below. Figures 7 to 10 As shown.

[0072] Depending on the requirements, the top chord 3, diagonal web members 4, and vertical web members 5 can be H-shaped sections, box-shaped sections, or other suitable sections. For example, when the top chord 3 uses an H-shaped section, refer to... Figure 4 The web of the upper chord 3 is horizontally arranged, and the two side flanges of the upper chord 3 can be used to connect the upper chord of the roof beam 8 or the roof truss. When the vertical web member 5 adopts an H-shaped section, refer to... Figure 4The web of the vertical web member 5 is set vertically and perpendicular to the web of the lower chord member 2. The flanges on both sides of the vertical web member 5 are also set vertically and can be used to connect the lower chord of the roof truss.

[0073] As an option, refer to Figure 1 The upper chord 3 includes an intermediate chord 31 and two connecting rods 32. The first end of the connecting rod 32 is connected to the corresponding end of the intermediate chord 31, and the second end of the connecting rod 32 is used to connect to the corresponding upper column 91 of the factory building. The cross-sectional area of ​​the connecting rod 32 is smaller than that of the intermediate chord 31.

[0074] The length of the intermediate chord 31 is less than the length of the lower chord 2, and the length of the entire upper chord 3 is close to the length of the lower chord 2. The two ends of each connecting rod 32 are respectively connected to the corresponding end of the intermediate chord 31 and the corresponding upper column 91 of the factory building. The upper ends of the aforementioned diagonal web members 4 and vertical web members 5 are both connected to the intermediate chord 31.

[0075] Since the upper chord end section is generally a stress-free component, the entire upper chord 3 is composed of intermediate chords 31 with different cross-sectional areas and two connecting rods 32, forming a variable cross-section structure, thus avoiding material waste.

[0076] In summary, the bracket-crane truss structure of this embodiment is an ultra-large span crane truss structure. The load-bearing truss supports the crane beam 1 through the intermediate corbel 6 at the bottom of the lower chord 2, and the upper chord 3 supports the roof beam or roof truss. The intermediate corbel 6 is set at the bottom of the load-bearing truss, and the crane beams 1 on both sides are supported by the intermediate corbel 6. The upper flange plate of the lower chord 2 of the load-bearing truss is connected to the upper flange plate of the crane beam 1 by thin steel plates, and the lower flange plate of the lower chord 2 of the load-bearing truss is connected to the lower flange plate of the crane beam 1 by thin steel plates. The web members and chord members of the load-bearing truss are connected by welding or high-strength bolts, which can realize modular fabrication and installation.

[0077] This entire structure is suitable for crane beams with ultra-large spans in industrial plants after column removal. The system integrates roof brackets, upper column supports, and the crane beam system, offering advantages such as simple construction, clear stress distribution, large span, reduced steel consumption, a clean and aesthetically pleasing appearance, and internal passage for process pipelines. Comparative analysis shows that it saves over 30% of steel compared to existing solid-web crane beams, demonstrating significant economic advantages. Furthermore, the system allows for modular fabrication, facilitating transportation and installation. Its market application value is further enhanced when high-strength bolts are used for connections. It also solves the problem that crane truss spans generally do not exceed 36m and addresses the issue of crane trusses occupying excessive space under the crane rails. The entire structure is suitable for spans exceeding 36m, such as 50m or 60m, and is also applicable to spans less than 36m.

[0078] The above are merely illustrative embodiments of this utility model and are not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A carrier-crane truss structure, characterized in that, It includes an upper chord, a web member assembly, and a lower chord connected sequentially from top to bottom; the lower chord has an I-shaped cross-section, and the web member assembly includes multiple diagonal web members and multiple vertical web members connected between the upper chord and the lower chord; the connection node between the upper chord and the web member assembly is used to connect the corresponding roof beam; or the connection node between the upper chord and the web member assembly is used to connect the upper chord of the roof truss, and at least a portion of the vertical web members are used to connect the lower chord of the roof truss; Two crane beams are provided parallel to each other and symmetrically on both sides of the lower chord. The crane beams have an I-shaped cross-section, and the top surface of the upper flange of the crane beam is used to install crane rails. Multiple intermediate brackets are connected at intervals along the length of the lower chord at the bottom. The lower flange of the crane beam is connected to the intermediate brackets. The two ends of the crane beam and the two ends of the lower chord are used to connect corresponding factory building brackets. An upper connecting plate is connected between the upper flange of the crane beam and the upper flange of the lower chord, and a lower connecting plate is connected between the lower flange of the crane beam and the lower flange of the lower chord.

2. The bracket-crane truss structure as described in claim 1, characterized in that, Each of the crane beams is connected to an upper connecting plate and multiple lower connecting plates, with each lower connecting plate located between two adjacent intermediate brackets or between a factory bracket and a corresponding intermediate bracket.

3. The bracket-crane truss structure as described in claim 1, characterized in that, The thicknesses of the upper flange plate of the lower chord, the lower flange plate of the lower chord, the upper flange plate of the crane beam, and the lower flange plate of the crane beam are all equal and greater than the thicknesses of the upper connecting plate and the lower connecting plate.

4. The bracket-crane truss structure as described in claim 1, characterized in that, The upper connecting plate is fixed to the upper flange plate of the crane beam and the upper flange plate of the lower chord by welding, or by high-strength bolts, or by a combination of high-strength bolts and welding; the lower connecting plate is fixed to the lower flange plate of the crane beam and the lower flange plate of the lower chord by welding, or by high-strength bolts, or by a combination of high-strength bolts and welding.

5. The bracket-crane truss structure as described in claim 1, characterized in that, The intermediate bracket has an I-shaped cross-section. The upper flange of the intermediate bracket is fixed to the lower flange of the lower chord and the lower flange of the crane beam by welding, or by high-strength bolts, or by a combination of high-strength bolts and welding.

6. The bracket-crane truss structure as described in claim 1, characterized in that, Stiffening plates are provided on both sides of the web plate of the middle corbel, directly opposite the web plate of the lower chord.

7. The bracket-crane truss structure as described in claim 1, characterized in that, Each of the aforementioned crane beams is a multi-span continuous beam; or Each of the crane beams comprises multiple single-span crane beams, and the end of each single-span crane beam is connected to a corresponding intermediate bracket or a corresponding building bracket.

8. The bracket-crane truss structure as described in claim 1, characterized in that, The height between the top surface of the crane beam and the bottom surface of the intermediate bracket is 2m-2.5m.

9. The bracket-crane truss structure as described in claim 1, characterized in that, Multiple node plates are provided on both the upper chord and the lower chord. The two ends of the diagonal web members are fixed to the corresponding node plates by welding, or by high-strength bolts, or by a combination of high-strength bolts and welding. The two ends of the vertical web members are fixed to the corresponding node plates by welding, or by high-strength bolts, or by a combination of high-strength bolts and welding.

10. The bracket-crane truss structure as described in claim 9, characterized in that, The number of vertical bracing members is the same as the number of intermediate corbels. Multiple vertical bracing members are respectively located directly above multiple intermediate corbels. Between two adjacent vertical bracing members, there is one diagonal bracing member or two diagonal bracing members arranged in a crisscross pattern. The ends of a portion of the vertical bracing members are connected to the ends of one or two adjacent diagonal bracing members to the same node plate.

11. The bracket-crane truss structure as described in claim 1, characterized in that, The upper chord, the diagonal web members, and the vertical web members have H-shaped or box-shaped cross sections.

12. The bracket-crane truss structure as described in claim 1, characterized in that, The upper chord includes an intermediate chord and two connecting rods. The first end of the connecting rod is connected to the corresponding end of the intermediate chord, and the second end of the connecting rod is used to connect to the corresponding upper column of the factory building. The cross-sectional area of ​​the connecting rod is smaller than that of the intermediate chord.

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