A large-span transfer truss with complex nodes and internal and external double webs and its construction method

Abstract

The present invention discloses a large-span conversion truss with a complex node and an inner and outer double web member and a construction method thereof. The large-span conversion truss comprises an embedded part connected to a foundation, an embedded column connected to the embedded part, a frame column connected to the top of the embedded column, a truss structure beam and a straight chord connected between adjacent frame columns, a truss structure secondary beam connected between adjacent straight chords, and a straight web member connected between upper and lower straight chords. By setting an inner and outer double layer of straight web members and ensuring the node connection strength through grouting, the overall stress-bearing performance of the truss is enhanced. The use of diagonal web members is eliminated, and while ensuring the integrity of the conversion truss, the building use space of the conversion layer is ensured. The present invention facilitates the positioning and clamping between the columns through the setting of sealing plates. The setting of upper and lower chord members is also conducive to the design of local protruding parts, which not only ensures the installation of the local protruding parts, but also saves the design of the diagonal rods on the top to ensure the overall strength and stress.

Description

Technical Field

[0001] The present invention belongs to the technical field of steel structures, and in particular relates to a large-span conversion truss with complex nodes and inner and outer double webs and a construction method thereof. Background Art

[0002] With the development of steel structures, their forms are becoming more and more diverse, and the demand for large spans and large spaces is becoming stronger. In the existing steel structure truss construction, general steel structure trusses include upper and lower chords, straight webs, and diagonal webs. The diagonal webs have a great impact on the application space of the building, and the spatial layout is very inflexible. Especially in large-span steel structures, in order to ensure the bearing capacity of the structure, the application of diagonal webs is becoming more and more common. How to remove the diagonal webs and ensure the bearing capacity of the structure while strengthening the strength of the straight web nodes is a key difficulty that needs to be solved urgently. In addition, how to ensure the upper and lower chords and their connection with other structures in large spans, as well as the design of local protruding structures, all increase the design difficulty. Summary of the Invention

[0003] The present invention provides a large-span transfer truss with complex nodes and internal and external double webs and a construction method thereof, which are used to solve technical problems such as the large-span transfer truss eliminating diagonal bracing, node reinforcement, main body assembly and connection, and installation of local protruding structures.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A large-span transfer truss with complex nodes and inner and outer double webs comprises embedded parts connected to a foundation, embedded columns connected to the embedded parts, frame columns connected to the tops of the embedded columns, truss structure beams and straight chords connected between adjacent frame columns, truss structure secondary beams connected between adjacent straight chords, and straight webs connected between upper and lower straight chords.

[0006] The straight web member comprises an outer web member, a web member bottom connecting plate and a web member top connecting plate connected to the bottom and top of the outer web member, and an inner web node rod arranged in the middle and lower part of the outer web member;

[0007] The outer web members are square hollow rods, the inner web node rods are square solid rods, a gap is provided between the outer web members and the inner web node rods, and the gap is filled with concrete;

[0008] Grouting holes, grouting holes and air holes are arranged on the outer web corresponding to the inner web node rods, and the grouting holes, grouting holes and air holes are arranged in sequence from bottom to top.

[0009] Furthermore, the embedded part is an L-shaped embedded part, the top of the L-shaped embedded part is connected to the square connecting steel plate at the bottom of the embedded column; the embedded column is a square column and its size is set corresponding to the size of the frame column; the outer peripheral side plate of the embedded column is covered with bolts;

[0010] The frame column includes a frame column body and a frame column connecting plate arranged on the frame column body, and the frame column connecting plate is arranged corresponding to the truss structure beam; the frame column body is arranged at the four corners and two opposite long sides of the steel structure.

[0011] Furthermore, the straight chord includes an upper chord and a lower chord, which are arranged alternately in the vertical direction and are provided with lifting ears on the top; the upper chord and the lower chord are both I-shaped steel beams, and the I-shaped steel beams are provided with reinforcing plates at intervals in the longitudinal direction and are spliced ​​and connected in the longitudinal direction.

[0012] Furthermore, the straight web members are staggered and arranged throughout the entire length between the upper chord and the lower chord, and the web member bottom connecting plate and the web member top connecting plate are arranged flush with the top plate and bottom of the upper chord and the lower chord, and are sealed with the bottom and top of the straight web members; stiffening rib plates are also connected between the web member bottom connecting plate and the web member top connecting plate and the chord.

[0013] The bottom connecting plate of the web member is set flush with the top plate of the lower chord, and the top connecting plate of the web member is set flush with the top plate of the upper chord.

[0014] The web member bottom connecting plate and the web member top connecting plate are sealedly connected to the bottom and top of the straight web member respectively; stiffening rib plates are also connected between the web member bottom connecting plate and the web member top connecting plate and the chord member respectively.

[0015] Furthermore, the inner web node rod includes a reinforced node column, a point bolt arranged on the reinforced node column, and a node cover plate is also arranged on the top of the reinforced node column; the reinforced node column is connected to the straight chord rod, and the node cover plate is rectangular and adapts to the hollow size inside the outer web rod; the height of the node cover plate is higher than the height of the air vent.

[0016] Furthermore, the frame columns are assembled and connected, and column docking plates are provided on the outer side surfaces of the adjacent frame columns at the joint, and a column connecting plate is bolted between the two column docking plates, and the column connecting plate and the column docking plate are in a U shape;

[0017] A sealing plate is provided on the top of the frame column below the splicing point. The sealing plate is enclosed in a square shape and has a U-shaped cross section. A plug-in plate is provided at the bottom of the frame column above the splicing point for corresponding connection.

[0018] Furthermore, the construction method of the large-span transfer truss with complex nodes and internal and external double webs has the following specific steps:

[0019] Step 1: Measure according to the design drawing or BIM 3D drawing, and then locate and install the embedded parts and embedded columns;

[0020] Step 2: sequentially install the frame columns on both sides of the long-span conversion truss, the truss structure beams and the frame columns at the ends of the long-span conversion truss to form an overall frame;

[0021] Step 3: Install the lower chord, upper chord, and diagonal chord of the long-span transfer truss and weld them to the frame columns;

[0022] Step 4: sequentially install the truss structure secondary beams between horizontally adjacent upper chords, between horizontally adjacent lower chords, and between the lower chords or the upper chords and the diagonal chords, and connect them with bolts;

[0023] Step 5: Install the straight web between the upper chord and the lower chord and weld them together;

[0024] Step 6: Each layer is installed in sequence according to the above steps, and connected by welding, bolts, etc. to form the final overall structure;

[0025] Step 7: Pour concrete into the straight web members through the grouting holes of the outer web members, so that the outer web members and the inner web node bars form a rigid integral reinforced node, thereby strengthening the integrity of the structural node.

[0026] Furthermore, for the lower chord, first assemble the lower flange plate of the lower chord, then assemble the web plate of the lower chord, and weld them to the lower flange plate of the lower chord; assemble the upper flange plate and the bottom connecting plate of the web or the top connecting plate of the web of the lower chord in sequence and weld them to the web plate of the lower chord respectively, and weld the upper flange plates of the adjacent lower chords to the bottom connecting plate of the web or the top connecting plate of the web of the lower chord respectively; assemble the reinforcement plate of the lower chord and weld them to the lower flange plate, the bottom connecting plate of the web or the top connecting plate of the web respectively; assemble the secondary rod connection plate and the secondary rod stiffening plate of the lower chord respectively, and weld them to the lower flange plate, the upper flange plate and the web plate of the lower chord; assemble the secondary rod brace of the lower chord corresponding to the secondary beam of the bolt-connected truss structure, and weld them to the reinforcement plate, the bottom connecting plate or the top connecting plate of the web of the lower chord respectively;

[0027] For the upper chord, first assemble the upper flange plate of the upper chord, then assemble the web plate of the upper chord, and weld them to the upper flange plate of the upper chord; assemble the upper flange plate of the upper chord and the bottom connecting plate of the web or the top connecting plate of the web in sequence and weld them to the web plate of the upper chord respectively, and weld the upper flange plates of the adjacent upper chords to the bottom connecting plate of the web or the top connecting plate of the web; assemble the reinforcement plate of the upper chord and weld them to the upper flange plate of the upper chord, the bottom connecting plate of the web or the top connecting plate of the web respectively. Connecting plate welding; assemble the secondary member connecting plate of the upper chord and the secondary member stiffening plate of the upper chord respectively, and weld them with the upper flange plate of the upper chord, the upper flange plate of the upper chord and the web plate of the upper chord; assemble the secondary member corbel of the upper chord with the secondary member connecting plate corresponding to the bolt connection truss structure secondary beam, and weld them with the reinforcement plate of the upper chord, the bottom connecting plate of the web or the top connecting plate of the web respectively; the long-span conversion truss is arranged obliquely on one or both sides, and the upper chord or lower chord is also set as an oblique chord.

[0028] Furthermore, for straight web members, four steel plates are assembled and welded to form an outer web member, and grouting holes, leakage holes, and air holes are sequentially opened on the outer web member. The grouting holes need to be sealed after pouring concrete; a stiffening rib is set on the top of the outer web member and welded together; for inner web node members, four steel plates are assembled and welded to form an inner web node member; a node cover is set on the top of the inner web node member and welded together; bolts are welded around the column wall of the inner web node member to hold the concrete tightly;

[0029] During installation, the inner web node rods are welded and installed first, and a sealing strip is provided inside the outer web rod corresponding to the node cover plate; the sealing between the sealing strip and the node cover plate is pre-tested during prefabrication; after the inner web node rods are installed, the outer web rods are installed, and the bottom of the outer web rod is welded to the corresponding web rod bottom connecting plate or web rod top connecting plate, and then grouting is performed in the grouting holes.

[0030] Furthermore, when the large-span conversion truss is partially protruding, the upper chord and the lower chord are connected, and a truss structure secondary beam and a straight web are provided, correspondingly connecting the frame column and the truss structure beam; the locally protruding straight web is a single-layer square rod and is correspondingly assembled and connected, and the assembly point and the frame column assembly point are correspondingly provided with a column connecting plate, a column docking plate and a sealing plate.

[0031] The beneficial effects of the present invention are embodied in:

[0032] 1) The present invention enhances the overall load-bearing performance of the truss by arranging inner and outer layers of straight web members and ensuring the strength of the node connections through grouting. It also eliminates the use of diagonal web members, ensuring the integrity of the transfer truss while ensuring the architectural space of the transfer layer.

[0033] 2) The present invention facilitates the positioning and connection between the columns by providing a sealing plate, and combines the column connecting plate with the column docking plate to ensure the connection strength of the columns. The present invention also strengthens the bottom fixation of the columns by using embedded parts and embedded columns.

[0034] 3) The present invention, through the provision of web bottom connecting plates and web top connecting plates, not only ensures the sealed welding of the straight webs, but also provides a welding foundation for the lower reinforcement plates and the stiffening ribs of the secondary beams of the truss structure, thus ensuring the overall shape of the structure. Moreover, for large-span trusses, the tops of the upper and lower chords are provided with lifting ears to facilitate lifting, and the reinforcement plates arranged at intervals increase the strength of the chords themselves.

[0035] 4) The present invention facilitates the design of local protruding parts by providing upper and lower chords, which not only ensures the installation of local protruding parts but also saves the design of the top diagonal rod to ensure the overall strength and force;

[0036] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or may be understood by practicing the present invention; the main purpose and other advantages of the present invention can be realized and obtained through the solutions particularly pointed out in the description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the three-dimensional structure of a large-span transfer truss with complex nodes and internal and external double webs;

[0038] Figure 2 Schematic diagram of the upper chord, lower chord and their connection structure;

[0039] Figure 3 It is a schematic diagram of the straight web and its connection structure;

[0040] Figure 4 It is a schematic diagram of the inner abdominal node rod structure;

[0041] Figure 5 This is a schematic diagram of the web bar top connecting plate structure;

[0042] Figure 6 Schematic diagram of the outer web and its connection structure;

[0043] Figure 7 It is a schematic diagram of the arrangement structure of grouting holes, grouting holes and air holes on the outer web;

[0044] Figure 8 It is a schematic diagram of the connection structure of the column connecting plate, column docking plate and sealing plate.

[0045] Figure markings: 1-embedded parts, 2-embedded columns, 3-frame columns, 31-frame columns, 32-frame column connecting plates, 4-truss structure beams, 5-straight chords, 51-lower chords, 52-upper chords, 6-truss structure secondary beams, 7-straight web members, 71-outer web members, 72-web member bottom connecting plates, 73-web member top connecting plates, 74-inner web node members, 741-reinforced node columns, 742-point bolts, 743-node cover plates, 8-oblique chords, 9-reinforcement plates, 10-lifting ears, 11-stiffening rib plates, 12-grouting holes, 13-leakage holes, 14-ventilation holes, 15-column connecting plates, 16-column docking plates, 17-sealing plates. DETAILED DESCRIPTION

[0046] Take a steel structure as an example, this steel structure is provided with a local protruding layer. Figures 1 to 8As shown, in order to ensure the internal space and large span of the steel structure, an internal and external double-web complex node large-span conversion truss is adopted, which includes an embedded part 1 connected to the foundation, an embedded column 2 connected to the embedded part 1, a frame column 3 connected to the top of the embedded column 2, a truss structure beam 4 and a straight chord 5 connected between adjacent frame columns 3, a truss structure secondary beam 6 connected between adjacent straight chords 5, and a straight web 7 connected between the upper and lower straight chords 5.

[0047] In this embodiment, the embedded part 1 is an L-shaped embedded steel part, the top of which is connected to the square connecting steel plate at the bottom of the embedded column 2. The embedded column 2 is a square column with dimensions corresponding to the frame column 3. The outer side panels of the embedded column 2 are covered with studs to ensure the tightness of the bottom connection.

[0048] In this embodiment, the frame column 3 includes a frame column body 31 and a frame column connecting plate 32 arranged on the frame column body 31, and the frame column connecting plate 32 is arranged corresponding to the truss structure beam 4; the frame column body 31 is arranged at the four corners and two opposite long sides of the steel structure.

[0049] In this embodiment, the frame columns 3 are assembled and connected, and column docking plates 16 are provided on the outer side surfaces of the columns of adjacent frame columns 3 at the splicing point. A column connecting plate 15 is bolted between the two column docking plates 16, and the column connecting plate 15 and the column docking plate 16 are in a U shape; a sealing plate 17 is provided on the top of the frame column 3 below the splicing point, and the sealing plate 17 is in a mouth shape and has a U-shaped cross section; a plug-in plate is provided at the bottom of the frame column 3 above the splicing point for corresponding connection.

[0050] In this embodiment, the straight chord 5 comprises an upper chord 52 and a lower chord 51, which are arranged in a staggered manner in the vertical direction and have lifting lugs 10 at their tops. Both the upper chord 52 and the lower chord 51 are I-shaped steel beams, each of which is provided with reinforcement plates 9 at intervals along its length and is spliced ​​together along its length. The straight web members 7 are staggered and arranged throughout the length of the upper chord 52 and the lower chord 51, with the web member bottom connecting plate 72 flush with the top plate of the lower chord 52, and the web member top connecting plate 73 flush with the top plate of the upper chord 51.

[0051] The web member bottom connecting plate 72 and the web member top connecting plate 73 are sealedly connected to the bottom and top of the straight web member 7 respectively; stiffening ribs 11 are also connected between the web member bottom connecting plate 72 and the web member top connecting plate 73 and the chord member.

[0052] Upper chord 52 lower chord 51

[0053] In this embodiment, the straight web member 7 comprises an outer web member 71, a web member bottom connecting plate 72 and a web member top connecting plate 73 connected at the bottom and top of the outer web member 71, and an inner web node member 74 disposed in the lower middle portion of the outer web member 71. The outer web member 71 is a square hollow steel rod, while the inner web node member 74 is a square solid rod. A gap is provided between the outer web member 71 and the inner web node member 74, and the gap is filled with concrete. Grouting holes 12, grouting holes 13, and ventilation holes 14 are provided on the outer web member 71 corresponding to the inner web node member 74. The grouting holes 13, grouting holes 12, and ventilation holes 14 are arranged in this order from bottom to top. The inner web node rod includes a reinforced node column 741, a point bolt arranged on the reinforced node column 741, and a node cover plate 743 is also arranged on the top of the reinforced node column 741; the reinforced node column 741 is connected to the straight chord rod 5, and the node cover plate 743 is rectangular and adapts to the hollow size inside the outer web rod 71; the height of the node cover plate 743 is higher than the height of the air vent 14.

[0054] Combine Figures 1 to 8 The construction method of the large-span transfer truss with complex nodes of inner and outer double webs is further described, which is characterized by the following specific steps:

[0055] Step 1: Measure according to the design drawing or BIM 3D drawing, and then locate and install the embedded parts 1 and embedded columns 2;

[0056] Step 2: sequentially install the frame columns 3 on both sides of the long-span conversion truss, the truss structure beams 4 and the frame columns 3 at the ends of the long-span conversion truss to form an integral frame;

[0057] Step 3: Install the lower chord 51, upper chord 52, and diagonal chord 8 of the large-span conversion truss and weld them to the frame column 3; for the lower chord 51, first assemble the lower flange plate of the lower chord 51, then assemble the web plate of the lower chord 51, and weld them to the lower flange plate of the lower chord 51; assemble the upper flange plate of the lower chord 51 and the web bottom connecting plate 72 or the web top connecting plate 73 in sequence and weld them to the web plate of the lower chord 51 respectively, and weld the upper flange plates of the adjacent lower chords 51 to the web bottom connecting plate 72 or the web top connecting plate 73 of the lower chord 51 respectively; assemble Install the reinforcement plate 9 of the lower chord 51 and weld them to the lower flange plate, web bottom connecting plate 72 or web top connecting plate 73 of the lower chord 51 respectively; assemble the secondary member connecting plate of the lower chord 51 and the secondary member stiffening plate of the lower chord 51 respectively, and weld them to the lower flange plate, upper flange plate and web plate of the lower chord 51; assemble the secondary member brace of the lower chord 51 with the secondary member connecting plate corresponding to the bolt connection truss structure secondary beam 6, and weld them to the reinforcement plate 9 of the lower chord 51, web bottom connecting plate 72 or web top connecting plate 73 respectively;

[0058] For the upper chord 52, first assemble the upper flange plate of the upper chord 52, then assemble the web plate of the upper chord 52, and weld them to the upper flange plate of the upper chord 52; assemble the upper flange plate of the upper chord 52 and the web bottom connecting plate 72 or the web top connecting plate 73 in sequence and weld them to the web plate of the upper chord 52 respectively, and weld the upper flange plates of the adjacent upper chords 52 to the web bottom connecting plate 72 or the web top connecting plate 73 of the upper chord 52 respectively; assemble the reinforcement plate 9 of the upper chord 52 and weld them to the upper chord 52 respectively. The upper flange plate of the chord 52, the web bottom connecting plate 72 or the web top connecting plate 73 are welded; the secondary member connecting plate of the upper chord 52 and the secondary member stiffening plate of the upper chord 52 are assembled respectively, and welded to the upper flange plate of the upper chord 52, the upper flange plate of the upper chord 52, and the web plate of the upper chord 52; the secondary member connecting plate corresponds to the bolt connection truss structure secondary beam 6 to assemble the secondary member bracket of the upper chord 52, and is welded to the reinforcement plate 9 of the upper chord 52, the web bottom connecting plate 72 or the web top connecting plate 73 respectively;

[0059] One side or both sides of the long-span conversion truss are arranged obliquely, and the upper chord 52 or the lower chord 52 is also configured as an oblique chord 8.

[0060] In this embodiment, the upper and lower chords 52 and 51 of the large-span transfer truss are segmented. Temporary supports on the underground first floor roof utilize standard sections, while temporary supports on the first and second floors utilize circular tubular columns. Diagonal bracing is employed at some of the large overhangs.

[0061] Step 4: Install the truss structure secondary beams 6 between the horizontally adjacent upper chords 52, between the horizontally adjacent lower chords 51, and between the lower chords 51 or the upper chords 52 and the diagonal chords 8 and connect them with bolts.

[0062] Step 5. Install the straight web member 7 between the upper chord 52 and the lower chord 51 and weld them together; for the straight web member 7, four steel plates are assembled and welded into the outer web member 71, and grouting holes 12, leakage holes 13, and air holes 14 are opened in sequence on the outer web member 71. The grouting holes 12 need to be sealed after pouring concrete; a stiffening rib 11 is set on the top of the outer web member 71 and welded together; for the inner web node rod 74, four steel plates are assembled and welded into the inner web node rod 74; the node cover plate 743 is set on the top of the inner web node rod 74 and welded together; point bolts 742 are welded around the column wall of the inner web node rod 74 to hold the concrete tightly.

[0063] Step 6: Each layer is installed in sequence according to the above steps, and connected by welding, bolts, etc. to form the final overall structure;

[0064] Step 7: Pour concrete into the straight web members 7 through the grouting holes 12 of the outer web members 71, so that the outer web members 71 and the inner web node members 74 form a rigid integral reinforced node, thereby strengthening the integrity of the structural node.

[0065] During installation, the inner web node rod 74 is welded and installed first, and a sealing strip is provided inside the outer web rod 71 corresponding to the node cover plate 743; the sealing between the sealing strip and the node cover plate 743 is pre-tested during prefabrication; after the inner web node rod 74 is installed, the outer web rod 71 is installed, and the bottom of the outer web rod 71 is welded to the corresponding web rod bottom connecting plate 72 or web rod top connecting plate 73, and then grouting is performed in the grouting hole 12.

[0066] In addition, when the large-span conversion truss is partially protruded, the upper chord 52 and the lower chord 51 are connected, and a truss structure secondary beam 6 and a straight web 7 are provided, correspondingly connecting the frame column 3 and the truss structure beam 4; the partially protruding straight web 7 is a single-layer square rod and is correspondingly assembled and connected, and the assembly point and the assembly point of the frame column 3 are correspondingly provided with a column connecting plate 15, a column docking plate 16 and a sealing plate 17.

[0067] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention.

Claims

1. A large-span transfer truss with complex nodes and inner and outer double webs, characterized by: It comprises an embedded part (1) connected to a foundation, an embedded column (2) connected to the embedded part (1), a frame column (3) connected to the top of the embedded column (2), a truss structure beam (4) and a straight chord (5) connected between adjacent frame columns (3), a truss structure secondary beam (6) connected between adjacent straight chords (5), and a straight web (7) connected between upper and lower straight chords (5); The straight web member (7) comprises an outer web member (71), a web member bottom connecting plate (72) and a web member top connecting plate (73) connected to the bottom and top of the outer web member (71), and an inner web node member (74) arranged in the middle and lower part of the outer web member (71); The outer web member (71) is a square hollow rod, the inner web node member (74) is a square solid rod, a gap is provided between the outer web member (71) and the inner web node member (74), and the gap is filled with concrete; Grouting holes (12), grouting holes (13) and air holes (14) are provided on the outer web member (71) corresponding to the inner web node member (74), and the grouting holes (13), grouting holes (12) and air holes (14) are provided in sequence from bottom to top.

2. The large-span transfer truss with complex nodes and inner and outer double webs according to claim 1, characterized in that: The embedded part (1) is an L-shaped embedded part, the top of which is connected to the square connecting steel plate at the bottom of the embedded column (2); the embedded column (2) is a square column and its size is set corresponding to the size of the frame column (3); the outer peripheral side plates of the embedded column (2) are covered with bolts; The frame column (3) comprises a frame column body (31) and a frame column connecting plate (32) arranged on the frame column body (31), wherein the frame column connecting plate (32) is arranged corresponding to the truss structure beam (4); the frame column body (31) is arranged at the four corners and two opposite longitudinal sides of the steel structure.

3. The large-span transfer truss with complex nodes and inner and outer double webs according to claim 1, characterized in that: The straight chord (5) comprises an upper chord (52) and a lower chord (51), the upper chord (52) and the lower chord (51) being arranged in a staggered manner in the vertical direction and having a lifting lug (10) provided at the top; the upper chord (52) and the lower chord (51) are both I-shaped steel beams, the I-shaped steel beams are provided with reinforcing plates (9) at intervals in the longitudinal direction, and the I-shaped steel beams are spliced ​​and connected in the longitudinal direction.

4. The large-span transfer truss with complex nodes and inner and outer double webs according to claim 1, characterized in that: The straight web member (7) is staggered and arranged between the upper chord member (52) and the lower chord member (51). The web member bottom connecting plate (72) is arranged flush with the top plate of the lower chord member (51). The web member top connecting plate (73) is arranged flush with the top plate of the upper chord member (52). The web member bottom connecting plate (72) and the web member top connecting plate (73) are respectively sealedly connected to the bottom and top of the straight web member (7); and stiffening rib plates (11) are further connected between the web member bottom connecting plate (72) and the web member top connecting plate (73) and the corresponding chord members.

5. The large-span transfer truss with complex nodes and inner and outer double webs according to claim 1, characterized in that: The inner web node rod (74) includes a reinforced node column (741), a dotted bolt (742) arranged on the reinforced node column (741), and a node cover plate (743) is also arranged on the top of the reinforced node column (741); the reinforced node column (741) is connected to the straight chord rod (5), and the node cover plate (743) is rectangular and adapts to the hollow size inside the outer web rod (71); the height of the node cover plate (743) is higher than the height of the air vent (14).

6. The large-span transfer truss with complex nodes and inner and outer double webs according to claim 1, characterized in that: The frame columns (3) are assembled and connected. At the splicing joint, column docking plates (16) are provided on the outer side surfaces of the adjacent frame columns (3) at the splicing joint. A column connecting plate (15) is bolted between the two column docking plates (16), and the column connecting plate (15) and the column docking plate (16) are in a C shape. At the top of the lower frame column (3) at the splicing joint, a sealing plate (17) is provided. The sealing plate (17) is enclosed in a square shape and has a U-shaped cross-section. At the bottom of the upper frame column (3) at the splicing joint, there is a corresponding insertion plate connection.

7. A construction method for a large-span transfer truss with complex nodes and inner and outer double webs according to any one of claims 1 to 6, characterized in that: The specific steps are as follows: Step 1: Measure according to the design drawing or BIM three-dimensional drawing, and then position and install the embedded parts (1) and the embedded columns (2). Step 2: Install the frame columns (3), truss structure beams (4) on both long sides of the long-span transfer truss, and the frame columns (3) at the ends of the long-span transfer truss in sequence to form an overall frame. Step 3: Install the lower chord rod (51), upper chord rod (52), and inclined chord rod (8) of the long-span transfer truss and weld them to the frame columns (3). Step 4: Install the secondary beams (6) of the truss structure between adjacent upper chord rods (52) horizontally, between adjacent lower chord rods (51) horizontally, and between the lower chord rod (51) or upper chord rod (52) and the inclined chord rod (8) in sequence and bolt them. Step 5: Install the vertical web members (7) between the upper chord rod (52) and the lower chord rod (51) and weld them. Step 6: Install each layer in sequence according to the above steps and form the final overall structure through welding or bolting. Step 7: Through the grouting holes (12) of the outer web members (71), pour concrete into the vertical web members (7) to make the outer web members (71) and the inner web joint members (74) form a rigid integral strengthened joint to strengthen and ensure the integrity of the structural joint.

8. The construction method of a large-span transfer truss with complex nodes and internal and external double webs according to claim 7, characterized in that: For the lower chord rod (51), first assemble the lower flange plate of the lower chord rod (51), then assemble the web plate of the lower chord rod (51) and weld it to the lower flange plate of the lower chord rod (51); assemble the upper flange plate of the lower chord rod (51) and the bottom connecting plate (72) or top connecting plate (73) of the web member in sequence and weld them to the web plate of the lower chord rod (51) respectively. The upper flange plates of adjacent lower chord rods (51) and the bottom connecting plate (72) or top connecting plate (73) of the web member of the lower chord rod (51) are welded respectively; assemble the reinforcement plate (9) of the lower chord rod (51) and weld it to the lower flange plate, bottom connecting plate (72) or top connecting plate (73) of the web member of the lower chord rod (51) respectively; assemble the secondary member connecting plate and the secondary member stiffening plate of the lower chord rod (51) respectively and weld them to the lower flange plate, upper flange plate, and web plate of the lower chord rod (51); the secondary member connecting plate is bolted to the secondary beam (6) of the truss structure correspondingly. Assemble the secondary member corbel of the lower chord rod (51) and weld it to the reinforcement plate (9), bottom connecting plate (72) or top connecting plate (73) of the web member of the lower chord rod (51) respectively. For the upper chord (52), first assemble the upper flange plate of the upper chord (52), then assemble the web plate of the upper chord (52), and weld them to the upper flange plate of the upper chord (52); assemble the upper flange plate of the upper chord (52) and the web bottom connecting plate (72) or the web top connecting plate (73) in sequence and weld them to the web plate of the upper chord (52), and weld the upper flange plates of the adjacent upper chords (52) to the web bottom connecting plate (72) or the web top connecting plate (73) of the upper chord (52); assemble the reinforcement plate (9) of the upper chord (52), and weld them to the upper flange plate (9) of the upper chord (52). The upper flange plate of the chord (52), the web bottom connecting plate (72) or the web top connecting plate (73) are welded; the secondary rod connecting plate of the upper chord (52) and the secondary rod stiffening plate of the upper chord (52) are assembled respectively, and are welded with the upper flange plate of the upper chord (52), the upper flange plate of the upper chord (52) and the web plate of the upper chord (52); the secondary rod connecting plate is connected to the secondary beam (6) of the truss structure corresponding to the bolt, and the secondary rod brace of the upper chord (52) is assembled, and is welded with the reinforcement plate (9) of the upper chord (52), the web bottom connecting plate (72) or the web top connecting plate (73); One side or both sides of the large-span conversion truss are arranged obliquely, and the upper chord (52) or the lower chord (51) is also configured as an oblique chord (8).

9. The construction method of a large-span transfer truss with complex nodes and internal and external double webs according to claim 7, characterized in that: For the straight web member (7), four steel plates are assembled and welded to form an outer web member (71), and grouting holes (12), grouting holes (13), and air holes (14) are sequentially opened on the outer web member (71). The grouting holes (12) need to be sealed after pouring concrete; a stiffening rib plate (11) is provided on the top of the outer web member (71) and welded; for the inner web node member (74), four steel plates are assembled and welded to form the inner web node member (74); a node cover plate (743) is provided on the top of the inner web node member (74) and welded; and point bolts (742) are welded around the column wall of the inner web node member (74) to play a role in holding the concrete; During installation, the inner web node rod (74) is first welded and installed, and a sealing strip is provided on the corresponding node cover plate (743) inside the outer web rod (71); the sealing between the sealing strip and the node cover plate (743) is pre-tested during prefabrication; after the inner web node rod (74) is installed, the outer web rod (71) is installed, and the bottom of the outer web rod (71) is welded to the corresponding web rod bottom connecting plate (72) or web rod top connecting plate (73), and then grouting is performed in the grouting hole (12).

10. The construction method of a large-span transfer truss with complex nodes and internal and external double webs according to claim 7, characterized in that: When the large-span conversion truss is partially protruded, the upper chord (52) and the lower chord (51) are connected, and a truss structure secondary beam (6) and a straight web (7) are provided, correspondingly connecting the frame column (3) and the truss structure beam (4); the locally protruding straight web (7) is a single-layer square rod and is correspondingly assembled and connected, and a column connecting plate (15), a column docking plate (16) and a sealing plate (17) are correspondingly provided at the assembly position and the assembly position of the frame column (3).

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