Large-span conveying truss with interlayer

Abstract

The invention relates to the technical field of conveying truss structures, in particular to a large-span conveying truss with an interlayer, which comprises a truss main body, a front end frame and a tail end frame formed by a plurality of end rods, a plurality of upper chords and lower chords connected between the front end frame and the tail end frame, and a bottom aisle structure arranged on the bottom surface of the truss main body, the bottom aisle structure is used for connecting the lower-layer conveying structure; the interlayer frame body is horizontally arranged in the truss main body, and vertical connecting rods are arranged on the interlayer frame body and fixedly connected with the truss main body; an interlayer aisle structure is arranged on the interlayer frame body and used for being connected with an upper-layer conveying structure. The enclosure structure comprises a plurality of connecting purlines arranged on the outer side of the truss body, and the outer sides of the connecting purlines are connected with maintenance baffles. The overall structure of the conveying truss is simplified, the situation that the structural size of the conveying truss is too large is avoided, and the external load acting on the conveying truss is reduced; and the overall stability and reliability of the conveying truss can be guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of conveying truss structures, and in particular to a large-span conveying truss with a mezzanine. Background Art

[0002] Factories that use bulk materials as raw materials or finished products generally have a large number of conveying equipment. The supporting structure of the overhead section of the conveying equipment generally adopts a multi-span lattice truss, which is supported on a lattice steel support. Due to the large variety of materials or the limited conveying capacity of a single conveying equipment, the process often arranges the material conveying equipment in the same logistics direction in the same vertical plane, forming a two-layer belt conveyor arrangement. At this time, the lower and upper planes of the lattice truss both support the conveying equipment and bear a large load. Due to environmental protection requirements, the conveying trusses need to be fully enclosed with corrugated steel plates; in addition, in order to meet the clear height requirements for the passage of maintenance personnel, the center distance between the upper and lower chords of the double-layer truss (truss height h1) is generally controlled at 2.5m to 3m, and the clear height h2 of the upper enclosed canopy is also set at about 2.5m. See the attached for details. Figure 1 , this solution has been patented: a double-layer overhead closed conveying corridor using assembled tube truss structure, patent number: ZL2021 2 1959865.2. In the solution disclosed in this patent, when the overhead conveying structure is affected by the terrain or existing buildings, the layout of the steel support is limited, and a conveying truss with a large span often appears. For example, when the conveying equipment crosses a municipal road, the span of the truss may even exceed 60m, and the overall performance requirements of the truss are relatively high. In order to meet the requirements, the overall structure of the cross frame may be enlarged, which is not conducive to the simplification of the structure.

[0003] In the case of double-layer large-span conveying trusses, since the span-to-height ratio of the space truss is generally controlled at 1 / 15 to 1 / 18 (i.e., the height of the truss h1 = (1 / 15 to 1 / 18) * L, where L is the span of the truss), when the span is 60m, the height of the truss reaches 3.5m to 4m. When a single-layer truss plus an upper canopy structure is adopted, plus the height h2 of the upper closed canopy, the total height of the conveying truss reaches 6m to 6.5m. At this time, the original patent solution has the following problems:

[0004] 1. Complex structural force transmission: The structure consists of a bottom truss and an arched canopy. The arched canopy only bears wind load and roof dust load, and the main load-bearing component is the bottom truss. When transmitting horizontal loads, especially wind loads, the arched canopy transfers live loads, dust loads and horizontal wind loads within the upper height range to the upper chord of the truss, and the force transmission path is complex.

[0005] 2. Poor structural integrity: When the arched canopy transfers the horizontal wind load within the upper height range to the upper chord of the truss, the wind loads borne by the upper and lower chords of the bottom truss are quite different. The cross-sections of the upper and lower chords of the truss and the horizontal supports are very different, and the stiffness is also very different. When the forces on the upper and lower chords of the truss are very different, the truss structure is torsion and the structural integrity is poor.

[0006] 3. The height of the single-layer truss at the bottom is relatively large, resulting in low space utilization of the bottom conveying equipment;

[0007] 4. There are many installation processes and a long construction period: The large-span conveyor consists of a two-layer structure. After the bottom truss structure is hoisted, it is necessary to install maintenance structures such as canopy keels and purlins on the upper part of the high-altitude truss, and finally install the corrugated steel plate, which is a complicated process;

[0008] 5. The overall height of the conveying structure is large, and the lateral wind load borne by the truss increases, causing the lateral force resistance members of the large-span truss to become larger, and the economy of the truss main structure and the bracket is poor.

[0009] It can be seen that the current double-layer large-span horizontal frame structure has room for improvement and should be optimized and adjusted to improve its ability to adapt to various terrain environments, while ensuring the stability of the overall structure and avoiding the overall structure from being too large. Therefore, a more reasonable technical solution should be proposed to solve the technical problems existing in the existing technology. Summary of the invention

[0010] In order to overcome at least one of the defects mentioned above, the present invention proposes a large-span conveying truss with a mezzanine. By arranging a mezzanine structure inside the truss, the overall structural size of the cross frame can be effectively controlled, and at the same time the overall structural strength of the truss is improved to ensure the stability and reliability of its large-span transportation.

[0011] In order to achieve the above purpose, the conveying truss disclosed in the present invention can adopt the following technical solutions:

[0012] A large-span conveying truss with a mezzanine, comprising:

[0013] The truss body includes a front end frame and a rear end frame formed by a plurality of end rods, a plurality of upper chord rods and a lower chord rod are connected between the front end frame and the rear end frame, and a bottom walkway structure is arranged on the bottom surface of the truss body, and the bottom walkway structure is used to connect and arrange the lower conveying structure;

[0014] The mezzanine frame is horizontally arranged inside the truss body, and a vertical connecting rod is arranged on the mezzanine frame to be connected and fixed with the truss body; a mezzanine walkway structure is arranged on the mezzanine frame, and the mezzanine walkway structure is used to connect and set the upper conveying structure;

[0015] The enclosure structure comprises a plurality of connecting purlins arranged on the outside of the truss body, and a maintenance baffle is connected to the outside of the connecting purlins.

[0016] The above-disclosed conveying truss uses a truss body as a load-bearing structure, wherein the inner bottom carries the lower conveying structure, and the internally arranged interlayer carries the interlayer conveying structure, thereby realizing the two-layer conveying structure for conveying materials, and the exterior of the truss body is wrapped by a protective structure to isolate and protect the internal materials; thus, it is avoided to set a conveying structure on the top of the truss body, and the overall height of the conveying truss can be reduced, thereby reducing the external load on the conveying truss; at the same time, as the load is reduced, the structural strength requirements of the truss body are also reduced, thereby avoiding an increase in the overall structural size.

[0017] Furthermore, the overall structure of the truss body maintains a high degree of consistency, thereby maintaining the overall strength to be stable and reliable, which can be achieved through a variety of solutions, and its structure is not limited to a single one. Here, an optimization is made and one of the feasible options is proposed: the upper end surface of the truss body is provided with a plurality of upper chord horizontal support rods, and the upper chord horizontal support rods are vertically connected and / or obliquely connected to two adjacent upper chord rods. When the above solution is adopted, the upper chord horizontal support rod can be connected and fixed to the upper chord rod by welding, and a profile such as square steel, channel steel, I-beam, etc. is used.

[0018] Furthermore, a reinforcement structure is also provided at the lower part of the truss body, and its structure is not limited to a single one. Here, an optimization is made and one of the feasible options is proposed: a plurality of lower chord horizontal support rods are provided at the lower end surface of the truss body, and the lower chord horizontal support rods vertically connect and / or obliquely connect two adjacent lower chord rods. When the above scheme is adopted, the lower chord horizontal support rod can be connected and fixed to the lower chord rod by welding, and a profile such as square steel, channel steel, I-beam, etc. is adopted.

[0019] Furthermore, a reinforcement structure is also provided on the side of the truss body, and its structure is not limited to a single one. Here, an optimization is made and one of the feasible options is proposed: a vertical web member is provided between the upper chord and the lower chord, including a straight web member and an oblique web member, the straight web member vertically connects the upper chord and the lower chord, and the oblique web member obliquely connects the upper chord and the lower chord. When the above scheme is adopted, one end of the straight web member and the oblique web member are close to each other at the upper chord or the lower chord, and fixed by welding, and the straight web member and the oblique web member are made of profiles, such as square steel, channel steel, I-beam, etc.

[0020] Furthermore, the sandwich frame can adopt a variety of structures, and its structure is not limited to a single one. Here, optimization is performed and one feasible option is proposed: the sandwich frame includes at least two sandwich longitudinal beams arranged in parallel with the upper chord and the lower chord, and the vertical connecting beams are arranged at intervals on the sandwich longitudinal beams; the sandwich frame also includes a sandwich cross beam for connecting the sandwich longitudinal beams. When the above solution is adopted, the sandwich frame is connected and fixed to the truss body as a whole, and the sandwich frame supports the sandwich walkway structure inside the truss body, thereby realizing double-layer transportation.

[0021] Furthermore, the bottom walkway structure in the truss body needs to carry the lower conveying structure, and its structure is not limited to a single one. Here, it is optimized and one of the feasible options is proposed: the bottom walkway structure includes a structural main beam and a structural secondary beam, the structural main beam vertically connects two adjacent lower chords, and the structural secondary beam is arranged on the structural main beam and parallel to the lower chord. When the above scheme is adopted, the number of the structural main beams and structural secondary beams is several, especially the structural secondary beams, which are arranged at intervals between the structural main beams to form a continuous interval, thereby forming a stable support. The lower conveying structure is arranged on the structural main beam and the structural secondary beam.

[0022] Furthermore, the bottom walkway structure can be optimized, and its structure is not limited to a single one. Here, we optimize and propose one feasible option: using the lower chord horizontal support rod vertically connecting the two lower chord rods as the main structural beam. When the above solution is adopted, the number of separately set main structural beams can be reduced, thereby streamlining the structure, improving the consistency of the truss body, and ensuring the overall strength and stability of the truss body.

[0023] Furthermore, the mezzanine walkway structure can adopt a variety of schemes, and its structure is not limited to a single one. Here, an optimization is made and one of the feasible options is proposed: the mezzanine walkway structure includes a mezzanine walkway main beam and a mezzanine walkway cross beam, the mezzanine walkway main beam is arranged in parallel with the upper chord and the lower chord, and the mezzanine walkway cross beam vertically connects the two phases of mezzanine walkway main beams. When the above scheme is adopted, the mezzanine walkway cross beams are several in number and are arranged continuously and spaced on the mezzanine walkway main beam.

[0024] Furthermore, in order to meet the needs of pedestrians, the bottom walkway structure and the mezzanine walkway structure are optimized, and a feasible option is proposed here: the bottom walkway structure and the mezzanine walkway structure also include a walkway plate. When the above solution is adopted, the walkway plate is made of steel plate, which is connected to the bottom walkway structure or the mezzanine walkway structure by welding and fasteners, and an anti-slip structure can be set on the steel plate.

[0025] Furthermore, in some environments with large inclination angles, in order to ensure pedestrian safety, the structure of the walkway plate is optimized. Here, one option is proposed: when the inclination angle of the truss is greater than 12°, the walkway plate adopts a stepped pedal structure. When the above solution is adopted, the walkway plate can be laid step by step using multiple plates.

[0026] Compared with the prior art, some beneficial effects of the technical solution disclosed in the present invention include:

[0027] The present invention avoids excessive structural dimensions of the conveying truss and reduces external loads acting on the conveying truss by simplifying the overall structure of the conveying truss; at the same time, it can ensure the overall stability and reliability of the conveying truss and ensure the reliability of transportation during actual application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only represent some embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a schematic diagram of the double-layer truss section and enclosure structure in the prior art.

[0030] Figure 2 This is the overall schematic diagram of the conveying truss.

[0031] Figure 3 for Figure 2 Partial schematic diagram of the front end of the conveyor truss.

[0032] Figure 4 for Figure 2 Schematic diagram of the part in the middle of the conveyor truss.

[0033] Figure 5 for Figure 2 A partial schematic diagram of the rear end of the conveyor truss.

[0034] Figure 6 Schematic diagram of the conveying truss section and enclosing structure.

[0035] Figure 7 Schematic diagram of the disassembled conveying structure.

[0036] Figure 8 This is the detailed drawing of the truss upper chord node.

[0037] Fig. 9 This is the detailed drawing of the truss lower chord node.

[0038] In the above drawings, the meanings of the symbols are as follows:

[0039] 1. Upper chord; 2. Lower chord; 3. Facade web; 301. Straight web; 302. Diagonal web; 4. Upper chord horizontal support; 5. Lower chord horizontal support; 6. Ground floor walkway structure; 601. Structural secondary beam; 602. Structural main beam; 7. End rod; 8. Support; 9. Mezzanine walkway structure; 901. Mezzanine longitudinal beam; 902. Mezzanine transverse beam; 10. Vertical connecting rod; 11. Purlin; 12. Maintenance baffle. DETAILED DESCRIPTION

[0040] The present embodiment is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0041] In view of the fact that the overall structure height of the conveying truss in the prior art is relatively large, the stability and reliability are poor, and there are many deficiencies during the transportation process, the following embodiment is optimized and proposes one of the feasible options.

[0042] Example

[0043] like Figure 2 to Figure 9 As shown, this embodiment provides a large-span conveying truss with a mezzanine, comprising:

[0044] Truss body, such as Figure 2 to Figure 5 As shown, it includes a front end frame and a rear end frame formed by a plurality of end rods 7, a plurality of upper chord rods 1 and a lower chord rod 2 are connected between the front end frame and the rear end frame, and a bottom walkway structure is arranged on the bottom surface of the truss body, and the bottom walkway structure is used to connect and set the lower conveying structure.

[0045] Preferably, the upper chord 1 and the lower chord 2 are horizontally arranged and used to bear the load. When the rod is too long, rods with different cross-sections can be selected in each section according to the stress conditions of each section. They are welded and connected by strong nodes such as high-strength bolts. In actual operation, strong nodes such as high-strength bolts are used to splice each section of the truss.

[0046] Preferably, a support 8 is provided below the truss body.

[0047] Sandwich frame, such as Figure 7 As shown, it is horizontally arranged inside the truss body, and a vertical connecting rod 10 is arranged on the mezzanine frame to be connected and fixed with the truss body; a mezzanine walkway structure 9 is arranged on the mezzanine frame, and the mezzanine walkway structure 9 is used to connect and set the upper conveying structure;

[0048] Enclosure structure, such as Figure 6 As shown, it includes a plurality of connecting purlins 11 arranged on the outside of the truss body, and a maintenance baffle 12 is connected to the outside of the connecting purlins 11.

[0049] Preferably, the maintenance baffle 12 in this embodiment is made of corrugated steel plate.

[0050] The conveying truss disclosed in the present embodiment uses a truss body as a load-bearing structure, wherein the inner bottom portion thereof bears the lower conveying structure, and the interlayer arranged inside bears the interlayer conveying structure, thereby realizing the two-layer conveying structure for conveying materials, and the exterior of the truss body is wrapped by a protective structure to isolate and protect the internal materials; thus, it is avoided to set a conveying structure on the top of the truss body, and the overall height of the conveying truss can be reduced, thereby reducing the external load on the conveying truss; at the same time, as the load is reduced, the structural strength requirement of the truss body is also reduced, thereby avoiding an increase in the overall structural size.

[0051] The overall structure of the truss body maintains a high degree of consistency, thereby maintaining the stability and reliability of the overall strength, which can be achieved through a variety of solutions, and its structure is not limited to a single one. This embodiment is optimized and adopts one of the feasible options: Fig. 9 As shown, the upper end surface of the truss body is provided with a plurality of upper chord horizontal support rods 4, which are vertically connected and / or obliquely connected to two adjacent upper chord rods 1. When the above scheme is adopted, the upper chord horizontal support rods 4 can be connected and fixed to the upper chord rods 1 by welding, and profiles such as square steel, channel steel, I-beam, etc. are adopted.

[0052] A reinforcement structure is also provided at the lower part of the truss body, and its structure is not limited to a single one. This embodiment is optimized and adopts one of the feasible options: Figure 8 As shown, the lower end surface of the truss body is provided with a plurality of lower chord horizontal support rods 5, and the lower chord horizontal support rods 5 are vertically connected and / or obliquely connected to two adjacent lower chord rods 2. When the above scheme is adopted, the lower chord horizontal support rods 5 can be connected and fixed to the lower chord rods 2 by welding, and profiles such as square steel, channel steel, I-beam, etc. are adopted.

[0053] A reinforcement structure is also provided on the side of the truss body, and its structure is not limited to a single one. This embodiment is optimized and adopts one of the feasible options: a vertical web member 3 is provided between the upper chord 1 and the lower chord 2, including a straight web member 301 and an oblique web member 302. The straight web member 301 vertically connects the upper chord 1 and the lower chord 2, and the oblique web member 302 obliquely connects the upper chord 1 and the lower chord 2. When the above scheme is adopted, one end of the straight web member 301 and the oblique web member 302 are close to each other at the upper chord 1 or the lower chord 2, and are fixed by welding. The straight web member 301 and the oblique web member 302 are made of profiles, such as square steel, channel steel, I-beam, etc.

[0054] The sandwich frame can adopt a variety of structures, and its structure is not limited to a single one. This embodiment is optimized and adopts one of the feasible options: the sandwich frame includes at least two sandwich longitudinal beams 901 arranged in parallel with the upper chord 1 and the lower chord 2, and the vertical connecting beams are arranged at intervals on the sandwich longitudinal beams 901; the sandwich frame also includes a sandwich cross beam 902 for connecting the sandwich longitudinal beams 901. When the above solution is adopted, the sandwich frame is connected and fixed to the truss body as a whole, and the sandwich frame supports the sandwich walkway structure 9 inside the truss body, thereby realizing double-layer transportation.

[0055] The bottom walkway structure in the truss body needs to carry the lower conveying structure, and its structure is not limited to a single one. This embodiment is optimized and adopts one of the feasible options: the bottom walkway structure includes a structural main beam 602 and a structural secondary beam 601. The structural main beam 602 vertically connects two adjacent lower chords 2, and the structural secondary beam 601 is arranged on the structural main beam 602 and parallel to the lower chord 2. When the above scheme is adopted, the structural main beam 602 and the structural secondary beam 601 are several in number, especially the structural secondary beam 601, which is arranged at intervals between the structural main beams 602 to form a continuous interval, thereby forming a stable support. The lower conveying structure is arranged on the structural main beam 602 and the structural secondary beam 601.

[0056] The bottom walkway structure can also be optimized, and its structure is not limited to a single one. This embodiment optimizes and adopts one of the feasible options: using the lower chord horizontal support 5 rods vertically connecting the two lower chord rods 2 as the structural main beam 602. When the above solution is adopted, the separately set structural main beam 602 can be reduced, thereby simplifying the structure, improving the consistency of the truss body, and ensuring the overall strength and stability of the truss body.

[0057] The mezzanine walkway structure 9 can adopt a variety of schemes, and its structure is not limited to a single one. This embodiment optimizes and adopts one of the feasible options: the mezzanine walkway structure 9 includes a mezzanine walkway main beam and a mezzanine walkway cross beam, the mezzanine walkway main beam is arranged in parallel with the upper chord rod 1 and the lower chord rod 2, and the mezzanine walkway cross beam vertically connects the two phases of mezzanine walkway main beams. When the above scheme is adopted, the mezzanine walkway cross beams are several in number and are continuously and spaced apart on the mezzanine walkway main beam.

[0058] Preferably, the mezzanine walkway main beam and the mezzanine walkway cross beam can be arranged at a middle height position of the truss body.

[0059] In order to meet the needs of pedestrians, the bottom walkway structure and the mezzanine walkway structure 9 are optimized. This embodiment adopts a feasible option: the bottom walkway structure and the mezzanine walkway structure 9 also include a walkway plate. When the above solution is adopted, the walkway plate is made of steel plate, which is connected to the bottom walkway structure or the mezzanine walkway structure 9 by welding and fasteners, and an anti-slip structure can be set on the steel plate.

[0060] In some environments with large inclination angles, in order to ensure pedestrian safety, the structure of the walkway plate is optimized. This embodiment adopts one of the options: when the inclination angle of the truss is greater than 12°, the walkway plate adopts a stepped pedal structure. When the above solution is adopted, the walkway plate can be laid step by step using multiple plates.

[0061] When the solution of this embodiment is implemented, the following effects are achieved:

[0062] 1. Adding a mezzanine frame inside the truss body makes full use of the internal space of the large-span truss, with high space utilization;

[0063] 2. When the height of the truss body is high, most of the web members are controlled by the slenderness ratio. After the sandwich frame is set in the long-span truss, the calculated length of the vertical web member 3 of the truss body is reduced, the stable stress of the vertical web member 3 of the truss body is reduced, and the cross-section of the vertical web member 3 can be reduced, which is economical;

[0064] 3. After the mezzanine frame is set in the long-span truss, the construction process is simplified: the purlin 11 of the maintenance structure can be installed on the ground and attached to the truss before the truss is hoisted. After the truss is hoisted into place, only the corrugated steel plate needs to be installed, which saves the process and thus can save the construction period.

[0065] 4. The force transmission of the structure is simple and clear, and the integrity is good: the horizontal load of the structure is directly borne by the large-span truss body, and the force transmission path is simple. Due to the optimization of the force transmission path, although the total load borne by the truss body has not been reduced, it saves the canopy keel and other load-bearing rods, thereby achieving good economy; and the wind loads borne by the upper and lower chords of the large-span truss are the same, the stiffness difference is not large, and the overall performance of the structure is good.

[0066] The above are the implementation methods listed in this embodiment, but this embodiment is not limited to the above optional implementation methods. Those skilled in the art can arbitrarily combine the above methods to obtain other various implementation methods. Anyone can derive other various implementation methods under the inspiration of this embodiment. The above specific implementation methods should not be understood as limiting the protection scope of this embodiment. The protection scope of this embodiment should be based on the definition in the claims.

Claims

1. A large-span conveying truss with a mezzanine, characterized in that: include: The truss body comprises a front end frame and a rear end frame formed by a plurality of end rods (7), a plurality of upper chord rods (1) and a lower chord rod (2) are connected between the front end frame and the rear end frame, and a bottom walkway structure is arranged on the bottom surface of the truss body, and the bottom walkway structure is used to connect and arrange a lower conveying structure; The mezzanine frame is horizontally arranged inside the truss body, and a vertical connecting rod (10) is arranged on the mezzanine frame to be connected and fixed with the truss body; the mezzanine frame is provided with a mezzanine walkway structure (9), and the mezzanine walkway structure (9) is used to connect and set the upper conveying structure; The enclosure structure comprises a plurality of connecting purlins (11) arranged outside the truss body, and a maintenance baffle (12) is connected to the outside of the connecting purlins (11).

2. The large-span conveying truss with interlayer according to claim 1 is characterized in that: The upper end surface of the truss body is provided with a plurality of upper chord horizontal support (4) rods, and the upper chord horizontal support (4) rods are vertically connected and / or obliquely connected to two adjacent upper chord rods (1).

3. The large-span conveying truss with interlayer according to claim 1 is characterized in that: The lower end surface of the truss body is provided with a plurality of lower chord horizontal support (5) rods, and the lower chord horizontal support (5) rods are vertically connected and / or obliquely connected to two adjacent lower chord rods (2).

4. The large-span conveying truss with interlayer according to claim 1 is characterized in that: A vertical web member (3) is arranged between the upper chord (1) and the lower chord (2), comprising a straight web member (301) and an oblique web member (302), wherein the straight web member (301) vertically connects the upper chord (1) and the lower chord (2), and the oblique web member (302) obliquely connects the upper chord (1) and the lower chord (2).

5. The large-span conveying truss with interlayer according to claim 1 is characterized in that: The sandwich frame includes at least two sandwich longitudinal beams (901) arranged in parallel with the upper chord (1) and the lower chord (2), and the vertical connecting beams are arranged at intervals on the sandwich longitudinal beams (901); the sandwich frame also includes a sandwich cross beam (902) for connecting the sandwich longitudinal beams (901).

6. The large-span conveying truss with interlayer according to claim 3 is characterized in that: The bottom walkway structure comprises a main structural beam (602) and a secondary structural beam (601), wherein the main structural beam (602) vertically connects two adjacent lower chords (2), and the secondary structural beam (601) is arranged on the main structural beam (602) and parallel to the lower chord (2).

7. The large-span conveying truss with interlayer according to claim 4 is characterized in that: A lower chord horizontal support (5) rod vertically connecting two lower chord rods (2) is used as a structural main beam (602).

8. The large-span conveying truss with interlayer according to claim 1 is characterized in that: The mezzanine walkway structure (9) comprises a mezzanine walkway main beam and a mezzanine walkway cross beam. The mezzanine walkway main beam is arranged in parallel with the upper chord (1) and the lower chord (2), and the mezzanine walkway cross beam vertically connects the two phases of the mezzanine walkway main beams.

9. The large-span conveying truss with interlayer according to claim 1, 6, 7 or 8, characterized in that: The bottom walkway structure and the sandwich walkway structure (9) also include walkway panels.

10. The large-span conveying truss with interlayer according to claim 9, characterized in that: When the inclination angle of the truss body is greater than 12°, the walkway plate adopts a stepped pedal structure.

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