Large-span arched steel truss with inclined supports and construction method of large-span arched steel truss

Abstract

The invention discloses a large-span arched steel truss with oblique supports and a construction method thereof, the steel truss is arched, the central structure of the steel truss is a pair of upper chords and a lower chord, the lower chord is located under the middle position of the pair of upper chords, and the two ends of each upper chord exceed the two ends of the lower chord in the chord direction; oblique supporting structures are symmetrically arranged at the two ends of a steel truss and used for supporting and installing the steel truss, and each oblique supporting structure comprises a reinforced steel concrete column, a steel column base, an A-shaped steel column and a back pulling steel rod, and the steel column base is directly or indirectly welded to the top end of a steel rib of the reinforced steel concrete column; the A-shaped steel columns incline upwards in the direction close to the chordwise midpoint of the steel truss, the two ends of the lower portions of the A-shaped steel columns are hinged to the pair of steel column feet respectively, the upper ends of the A-shaped steel columns are hinged to the ends of the lower chords, and the back-pulling steel rods incline upwards in the direction away from the chordwise midpoint of the steel truss, and the upper ends and the lower ends of the back-pulling steel rods are hinged to the ends of the upper chords and the steel column feet respectively. According to the steel truss, deflection deformation can be reduced, the anti-deflection performance is enhanced, the anti-seismic performance is improved, and steel is saved.

Description

Technical Field

[0001] The present invention belongs to the field of steel structures, and particularly relates to a large-span arched steel truss with diagonal supports and a construction method thereof. Background Art

[0002] Large-span steel trusses are widely used in large public buildings such as factories, gymnasiums, and exhibition halls. When installing a large-span steel truss, its support structure should consider both the overall stability and the seismic performance, and to a certain extent, the steel consumption should also be considered. At present, large-span steel trusses generally use large-sized vertical steel frames as supports. Although the overall stability is good, due to the large span and weight of the large-span steel truss, large deflections are likely to occur in the middle. The vertical steel frames cannot effectively relieve the downward deflection deformation, and moreover, the vertical steel frames cannot improve the seismic performance, and the steel consumption of the vertical steel frames themselves is relatively large. Summary of the Invention

[0003] The purpose of the present invention is to provide a large-span arched steel truss with diagonal supports and a construction method thereof. The steel truss can reduce deflection deformation, enhance the anti-deflection performance, ensure the overall stability, improve the seismic performance, and greatly save steel.

[0004] The technical solution adopted by the present invention is as follows: A large-span arched steel truss with diagonal supports includes a steel truss and a diagonal support structure; the steel truss is arched, and its central structure is a pair of upper chord bars and a lower chord bar. The lower chord bar is directly below the middle position between the pair of upper chord bars. The two ends of the upper chord bars extend beyond the two ends of the lower chord bar in the chord direction. The diagonal support structure is symmetrically arranged at both ends of the steel truss and is used to support and install the steel truss. It includes a stiffened concrete column, a steel column base, an H-shaped steel column, and a back-pulling steel rod. The stiffened concrete column and the back-pulling steel rod are both symmetrically arranged with respect to the vertical plane where the lower chord bar is located. The steel column base is directly or indirectly welded to the top of the steel skeleton of the stiffened concrete column. The H-shaped steel column inclines upward towards the midpoint of the chord direction of the steel truss, and the two lower ends of the H-shaped steel column are respectively hinged to a pair of steel column bases, and one upper end of the H-shaped steel column is hinged to the end of the lower chord bar. The H-shaped steel column is used to bear vertical loads. The back-pulling steel rod inclines upward away from the midpoint of the chord direction of the steel truss, and the upper and lower ends of the back-pulling steel rod are respectively hinged to the end of the upper chord bar on the corresponding side and the steel column base on the corresponding side. The back-pulling steel rod is used to provide a pre-tension force.

[0005] Preferably, the steel truss includes a main truss and wing trusses; the main truss includes a pair of upper chord bars, a lower chord bar, central connecting rods distributed and connected between the pair of upper chord bars, and central web members distributed and connected between the upper chord bars and the lower chord bar; the wing trusses are symmetrically arranged on both sides of the main truss, and each wing truss includes a wing chord bar, side upper web members distributed and connected between the wing chord bar and the upper chord bar, and side lower web members distributed and connected between the wing chord bar and the lower chord bar. The wing chord bar is higher than the lower chord bar and lower than the upper chord bar.

[0006] Preferably, the central connecting rod is a straight rod. The two ends of the central connecting rod are respectively welded to a pair of upper chord rods, and the central connecting rod is distributed at both ends and along the line of the upper chord rod; the central web member is an inclined rod, with four central web members in a group. The lower ends of each group of central web members are all welded to the lower chord rod and share the same node. Each group of central web members is distributed at both ends and along the line of the lower chord rod. Each group of central web members has a pair of central web members inclined towards one side of the chord and another pair of central web members inclined towards the other side of the chord. Each pair of central web members is symmetric about the vertical plane where the lower chord rod is located, and the upper ends of each pair of central web members are respectively welded to a pair of upper chord rods and share the same node with the central connecting rod; the side upper web member is an inclined rod. The upper end of the side upper web member is hinged to the upper chord rod and shares the same node with the central connecting rod, and the lower end is welded to the wing chord rod. The side upper web members are distributed at both ends and along the line of the upper chord rod. The side upper web members in the middle along the line are in groups of two. The upper ends of each group of side upper web members share the same node. Each group of side upper web members has one side upper web member inclined towards one side of the chord and another side upper web member inclined towards the other side of the chord. The adjacent groups of side upper web members share the same node at the lower end. The upper and lower ends of the side upper web members at the ends are respectively located at the ends of the upper chord rod and the wing chord rod; the side lower web member is a straight rod. The side lower web members are distributed at both ends and along the line of the lower chord rod. The upper end of the side lower web member is welded to the wing chord rod and shares the same node with the lower end of the side upper web member, and the lower end is hinged to the lower chord rod and shares the same node with the lower end of the central web member.

[0007] Preferably, when fabricating each section of the steel truss, first fabricate the upper chord rod, lower chord rod, wing chord rod, central connecting rod, central web member, side upper web member and side lower web member respectively, ensure that the upper chord rod, lower chord rod and wing chord rod meet the length and radian requirements, ensure that the central connecting rod, central web member, side upper web member and side lower web member corresponding to each node meet the length requirements, and mark the central connecting rod, central web member, side upper web member and side lower web member corresponding to each node. Then determine the positions of the nodes and the connection positions of each connecting member along the lines of the upper chord rod, lower chord rod and wing chord rod and mark them. Then install a pair of upper chord rods and the central connecting rod between them first, and then install the lower chord rod and the central web member to form the main truss. Then install the wing trusses on both sides of the main truss. When installing the wing trusses, first hinge and install the upper ends of the side upper web members along the line of the upper chord rod and hinge and install the lower ends of the side lower web members along the line of the lower chord rod, and then weld the wing chord rod to the lower ends of the side upper web members and the upper ends of the side lower web members.

[0008] Preferably, the back-pulling steel rod includes a steel rod and rod anchor heads provided at both ends of the steel rod. The rod anchor heads at both ends are respectively hinged to the lugs at the ends of the upper chord rod and the lugs on the steel column feet through pin shafts.

[0009] Preferably, the A-shaped steel column includes a pair of steel columns and column anchor heads provided at both ends of the steel columns. The column anchor heads at both ends are respectively hinged to the lugs at the ends of the lower chord rod and the lugs on the steel column feet through pin shafts.

[0010] Preferably, an inclined frustum is welded to the top end of the steel skeleton of the reinforced steel concrete column. The inclined direction of the frustum is the same as that of the lower part of the H-shaped steel column on the corresponding side. The top surface of the frustum is an inclined plane, and the inclined direction of the top surface of the frustum is perpendicular to the inclined direction of the frustum. The bottom surface of the steel column foot is attached and welded to the top surface of the frustum.

[0011] The construction method of the above-mentioned long-span arched steel truss with diagonal bracing is as follows: First, use BIM technology to simulate the splicing, lifting, and support installation processes of the steel truss to ensure that the steel truss can be accurately spliced, reliably lifted, and precisely installed during on-site construction; on-site, first locate the axis and mark it, accurately position the location of the reinforced steel concrete column and construct the reinforced steel concrete column. During construction, ensure the position accuracy and elevation of the steel skeleton of the reinforced steel concrete column. Then, directly or indirectly weld the steel column foot to the top end of the steel skeleton of the reinforced steel concrete column and ensure it is in the designed orientation of the steel column foot. Then, segmentally assemble the steel truss. After passing the assembly inspection, use multiple hydraulic lifters to synchronously lift the steel truss as a whole. First, lift it a short distance and pause, let it stand for a period of time. After checking that there is no abnormality in the steel truss and the hydraulic lifters, continue to lift it to the designed position. Then, first install the H-shaped steel columns at both ends, and then install the back tension rods at both ends. After the steel truss reaches the designed state, remove the hydraulic lifters.

[0012] Preferably, the steel skeleton of the reinforced steel concrete column adopts a cross structure. When constructing the reinforced steel concrete column, first install the steel skeleton and determine its position accuracy and elevation, and then pour concrete. During the pouring process, monitor the position at the cross of the top of the steel skeleton. If there is an offset, correct it immediately. The position and orientation of the steel column foot are based on the cross at the top of the steel skeleton.

[0013] The beneficial effects of the present invention are as follows: The arched shape of the steel truss can reduce the deflection deformation caused by the long span. At the same time, the lower side of its end is supported by the H-shaped steel column to bear the vertical load, and the upper side is provided with a pre-tension force by the back tension rod. Moreover, the H-shaped steel column and the back tension rod are inclined towards the direction close to the chord midpoint and away from the chord midpoint respectively. Therefore, it can provide a flexural resistance force to the arched steel truss and enhance the flexural resistance performance; the cooperation of the H-shaped steel column and the back tension rod is adopted. On the basis of ensuring the overall stability, it can provide a counter-tension force when the steel truss is laterally stressed, prevent the steel truss from lateral instability, and improve the seismic performance; the combination of the H-shaped steel column, the back tension rod, the steel column foot, and the reinforced steel concrete column is used to replace the vertical steel frame, greatly saving steel; the steel column foot bears both the tension applied by the back tension rod and the pressure applied by the H-shaped steel column, and the force is relatively balanced. Moreover, it can also transmit the force downward to the reinforced steel concrete column, ensuring reliable load-bearing and supporting the steel truss. Description of the Drawings

[0014] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic diagram of a large-span arched steel truss with diagonal supports in the present invention.

[0016] Figure 2 It is a schematic diagram of the steel truss in the present invention.

[0017] Figure 3 It is a schematic diagram of the back-pulling steel rod in the present invention.

[0018] Figure 4 It is a schematic diagram of the H-shaped steel column in the present invention.

[0019] Figure 5 It is a schematic diagram of the steel column base in the present invention.

[0020] Figure 6 It is a schematic diagram of the connection of the back-pulling steel rod, the H-shaped steel column, and the steel column base in the present invention.

[0021] Figure 7 It is a schematic diagram of the connection node between the H-shaped steel column and the steel truss in the present invention.

[0022] Figure 8 It is a schematic diagram of the connection node between the back-pulling steel rod and the steel truss in the present invention.

[0023] In the figure: 1 - steel truss; 11 - upper chord; 12 - wing chord; 13 - lower chord; 14 - central connecting rod; 15 - upper side abdominal rod; 16 - lower side abdominal rod; 17 - central abdominal rod; 18 - lug; 2 - back-pulling steel rod; 21 - steel rod; 22 - rod anchor head; 3 - H-shaped steel column; 31 - steel column; 32 - column anchor head; 4 - steel column base; 41 - steel column base body; 42 - lug; 5 - frustum; 6 - pin shaft. Specific embodiments

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Accordingly, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0026] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0027] The features and performance of the present application will be further described in detail below in conjunction with embodiments.

[0028] Embodiment 1 This embodiment discloses a large-span arched steel truss with diagonal supports, as Figures 1 to 8 shown: It includes a steel truss 1 and a diagonal support structure; the steel truss 1 is arched, and its central structure is a pair of upper chord bars 11 and a lower chord bar 13. The lower chord bar 13 is directly below the middle position between the pair of upper chord bars 11, and both ends of the upper chord bars 11 extend beyond both ends of the lower chord bar 13 in the chord direction; the diagonal support structure is symmetrically arranged at both ends of the steel truss 1 and is used to support and install the steel truss 1. It includes a reinforced concrete column, a steel column base 4, an H-shaped steel column 3, and a back-pulling steel rod 2. The reinforced concrete column and the back-pulling steel rod 2 are both symmetrically arranged with respect to the vertical plane where the lower chord bar 13 is located. The steel column base 4 is directly or indirectly welded to the top of the steel skeleton of the reinforced concrete column. The H-shaped steel column 3 inclines upward towards the midpoint of the chord direction of the steel truss 1, and its lower two ends are respectively hinged to a pair of steel column bases 4, and its upper one end is hinged to the end of the lower chord bar 13. The H-shaped steel column 3 is used to bear vertical loads. The back-pulling steel rod 2 inclines upward away from the midpoint of the chord direction of the steel truss 1, and its upper and lower ends are respectively hinged to the end of the upper chord bar 11 on the corresponding side and the steel column base 4 on the corresponding side. The back-pulling steel rod 2 is used to provide a pre-tension force. The arched shape of the steel truss 1 can reduce the deflection deformation caused by the large span. At the same time, the lower side of its end bears vertical loads with the H-shaped steel column 3, and the upper side provides a pre-tension force with the back-pulling steel rod 2. Moreover, the H-shaped steel column 3 and the back-pulling steel rod 2 respectively incline towards the midpoint of the chord direction and away from the midpoint of the chord direction. Therefore, it can provide a flexural resistance force to the arched steel truss 1 and enhance the flexural resistance performance; the cooperation of the H-shaped steel column 3 and the back-pulling steel rod 2 is adopted. On the basis of ensuring the overall stability, it can provide a counter-tension force when the steel truss 1 is laterally stressed, preventing the steel truss 1 from lateral instability and improving the seismic performance; the combination of the H-shaped steel column 3, the back-pulling steel rod 2, the steel column base 4, and the reinforced concrete column is used to replace the vertical steel frame, greatly saving steel; the steel column base 4 bears both the tension applied by the back-pulling steel rod 2 and the pressure applied by the H-shaped steel column 3, and the force is relatively balanced. Moreover, it can also transfer downward to the reinforced concrete column, ensuring reliable bearing and supporting of the steel truss 1.

[0029] Regarding the steel truss 1, in this embodiment, preferably: As Figure 2 shown, the steel truss 1 includes a main truss and wing trusses; the main truss includes a pair of upper chord members 11, a lower chord member 13, central connecting rods 14 distributed and connected between the pair of upper chord members 11, and central web members 17 distributed and connected between the upper chord member 11 and the lower chord member 13; the wing trusses are symmetrically arranged on both sides of the main truss, and each includes a wing chord member 12, side upper web members 15 distributed and connected between the wing chord member 12 and the upper chord member 11, and side lower web members 16 distributed and connected between the wing chord member 12 and the lower chord member 13. The wing chord member 12 is higher than the lower chord member 13 and lower than the upper chord member 11. The five arched chord members and each connecting member form a long-span arched truss. With the main truss as the central structure, its two ends are directly connected to the diagonal bracing structure, that is, the main truss bears the load independently. On the one hand, the wing trusses can increase the width, and on the other hand, they are beneficial to controlling the torsion under unbalanced loads, improving the safety and integrity of the long-span arched truss.

[0030] Taking into comprehensive consideration the structural reliability, weight reduction, and ease of fabrication, each connecting member adopts the following structure: As Figure 2 shown, the central connecting rod 14 is a straight rod. The two ends of the central connecting rod 14 are respectively welded to the pair of upper chord members 11, and the central connecting rod 14 is distributed along the two ends and the line of the upper chord member 11; the central web member 17 is an inclined rod. Four central web members 17 form a group. The lower ends of each group of central web members 17 are all welded to the lower chord member 13 and share a node. Each group of central web members 17 is distributed along the two ends and the line of the lower chord member 13. Each group of central web members 17 has a pair of central web members 17 inclined towards one side of the chord and another pair of central web members 17 inclined towards the other side of the chord. Each pair of central web members 17 is symmetric about the vertical plane where the lower chord member 13 is located. The upper ends of each pair of central web members 13 are respectively welded to a pair of upper chord members 11 and share a node with the central connecting rod 14; the side upper web member 15 is an inclined rod. The upper end of the side upper web member 15 is hinged to the upper chord member 11 and shares a node with the central connecting rod 14, and the lower end is welded to the wing chord member 12. The side upper web members 15 are distributed along the two ends and the line of the upper chord member 11. The side upper web members 15 in the middle along the line are in groups of two. The upper ends of each group of side upper web members 15 share a node. Each group of side upper web members 15 has a side upper web member 15 inclined towards one side of the chord and another side upper web member 15 inclined towards the other side of the chord. The adjacent groups of side upper web members 15 share a node at the lower end. The upper and lower ends of the side upper web members 15 at the ends are respectively located at the ends of the upper chord member 11 and the wing chord member 12; the side lower web member 16 is a straight rod. The side lower web members 16 are distributed along the two ends and the line of the lower chord member 13. The upper end of the side lower web member 16 is welded to the wing chord member 12 and shares a node with the lower end of the side upper web member 15, and the lower end is hinged to the lower chord member 13 and shares a node with the lower end of the central web member 17.

[0031] When fabricating each section of the steel truss: First, fabricate the upper chord 11, lower chord 13, wing chord 12, central connecting rod 14, central web member 17, upper side web member 15, and lower side web member 16 separately, ensuring that the upper chord 11, lower chord 13, and wing chord 12 meet the length and radian requirements, ensuring that the corresponding central connecting rod 14, central web member 17, upper side web member 15, and lower side web member 16 at each node meet the length requirements, and marking the corresponding central connecting rod 14, central web member 17, upper side web member 15, and lower side web member 16 at each node. Then, determine and mark the positions of the nodes and the connection positions of each connecting member along the upper chord 11, lower chord 13, and wing chord 12. Then, install a pair of upper chords 11 and the central connecting rod 14 between them first, and then install the lower chord 13 and the central web member 17 to form the main truss. Then, install the wing trusses on both sides of the main truss. When installing the wing trusses, first hinge and install the upper ends of the upper side web members 15 along the upper chord 11, hinge and install the lower ends of the lower side web members 16 along the lower chord 13, and then weld the wing chord 12 to the lower ends of the upper side web members 15 and the upper ends of the lower side web members 16.

[0032] Regarding the diagonal bracing structure, in this embodiment, preferably: As Figure 3 、 Figure 6 And Figure 8 Shown in the figures, the back-pull steel rod 2 includes a steel rod 21 and rod anchor heads 22 provided at both ends of the steel rod 21. The rod anchor heads 22 at both ends are respectively hinged to the lugs 18 at the ends of the upper chord 11 and the lugs 42 on the steel column base 4 through a pin shaft 6.

[0033] As Figure 1 、 Figure 4 、 Figure 6 And Figure 7 Shown in the figures, the H-shaped steel column 3 includes a pair of steel columns 31 and column anchor heads 32 provided at both ends of the steel columns 31. The column anchor heads 32 at both ends are respectively hinged to the lugs at the ends of the lower chord 13 and the lugs 42 on the steel column base 4 through a pin shaft 6.

[0034] As Figure 1 And Figure 6 Shown in the figures, the steel skeleton at the top of the steel reinforced concrete column is welded with an inclined frustum 5. The inclined direction of the frustum 5 is the same as the inclined direction of the lower part of the H-shaped steel column 3 on the corresponding side. The top surface of the frustum 5 is an inclined plane, and the inclined direction of the top surface of the frustum 5 is perpendicular to the inclined direction of the frustum 5. The bottom surface of the steel column base 4 is attached and supported on the top surface of the frustum 5 and welded.

[0035] In this embodiment, the rod anchor head 21, column anchor head 31, and steel column base 4 are made of cast steel.

[0036] Embodiment 2 This embodiment discloses the construction method of the above-mentioned large-span arched steel truss with diagonal bracing: S1. Use BIM technology to simulate the splicing, lifting, and support installation processes of the steel truss to ensure that the steel truss 1 can be accurately spliced, reliably lifted, and precisely installed during on-site construction; S2. On-site, first locate and mark the axis, accurately position the location of the steel reinforced concrete column and construct the steel reinforced concrete column, and ensure the position and elevation of the steel skeleton of the steel reinforced concrete column during construction; S3. Directly or indirectly weld the steel column base 4 to the top of the steel skeleton of the steel reinforced concrete column and ensure it is in the designed orientation of the steel column base 4; S4. Assemble the steel truss 1 in sections. After the assembly inspection is qualified, use multiple hydraulic lifters to synchronously lift the steel truss 1 as a whole. First, lift a small distance (e.g., 200 mm) and pause, and let it stand for a period of time (e.g., 4 - 12 hours). After checking that the steel truss 1 and the hydraulic lifters are normal, continue to lift to the designed position; S5. First install the A-shaped steel columns 3 at both ends, and then install the back-tension steel rods 2 at both ends. After the steel truss 1 reaches the designed state, remove the hydraulic lifters.

[0037] In this embodiment, the steel skeleton of the steel reinforced concrete column adopts a cross structure. When constructing the steel reinforced concrete column, first install the steel skeleton and determine its position and elevation, and then pour concrete. During the pouring process, monitor the position of the cross intersection at the top of the steel skeleton. If there is an offset, correct it immediately. The position and orientation of the steel column base 4 are based on the cross intersection at the top of the steel skeleton. The above-described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

Claims

1. A long-span arched steel truss with diagonal supports, characterized in that: It includes a steel truss and an inclined bracing structure; the steel truss is arched, and its central structure consists of a pair of upper chord bars and a lower chord bar. The lower chord bar is directly below the middle position between the pair of upper chord bars, and both ends of the upper chord bars extend beyond both ends of the lower chord bar in the chord direction; the inclined bracing structure is symmetrically arranged at both ends of the steel truss and is used to support and install the steel truss. It includes a reinforced concrete column, a steel column base, an H-shaped steel column, and a back-pulling steel rod. Both the reinforced concrete column and the back-pulling steel rod are symmetrically arranged with respect to the vertical plane where the lower chord bar is located. The steel column base is directly or indirectly welded to the top of the steel skeleton of the reinforced concrete column. The H-shaped steel column inclines upward towards the midpoint of the chord direction of the steel truss, and its lower two ends are respectively hinged to a pair of steel column bases, and its upper one end is hinged to the end of the lower chord bar. The H-shaped steel column is used to bear the vertical load. The back-pulling steel rod inclines upward away from the midpoint of the chord direction of the steel truss, and its upper and lower ends are respectively hinged to the end of the upper chord bar on its side and the steel column base on its side. The back-pulling steel rod is used to provide pre-tension.

2. The long-span arched steel truss with inclined supports as described in claim 1, wherein: The steel truss includes a main truss and wing trusses; the main truss includes a pair of upper chord bars, a lower chord bar, central connecting rods distributed and connected between the pair of upper chord bars, and central web members distributed and connected between the upper chord bar and the lower chord bar; the wing trusses are symmetrically arranged on both sides of the main truss, and each includes a wing chord bar, side upper web members distributed and connected between the wing chord bar and the upper chord bar, and side lower web members distributed and connected between the wing chord bar and the lower chord bar. The wing chord bar is higher than the lower chord bar and lower than the upper chord bar.

3. The long-span arch steel truss with diagonal supports according to claim 2, wherein: The central connecting rods are straight bars, and both ends of the central connecting rods are respectively welded to the pair of upper chord bars. The central connecting rods are distributed at both ends of the upper chord bars and along the line; the central web members are inclined bars, with four in a group. The lower ends of each group of central web members are all welded to the lower chord bar and share a node. Each group of central web members is distributed at both ends of the lower chord bar and along the line. Each group of central web members has a pair of central web members inclined towards one side of the chord direction and another pair inclined towards the other side of the chord direction. Each pair of central web members is symmetric with respect to the vertical plane where the lower chord bar is located. The upper ends of each pair of central web members are respectively welded to a pair of upper chord bars and share a node with the central connecting rods; the side upper web members are inclined bars. The upper ends of the side upper web members are hinged to the upper chord bar and share a node with the central connecting rods, and the lower ends are welded to the wing chord bar. The side upper web members are distributed at both ends of the upper chord bars and along the line. The side upper web members in the middle along the line are in groups of two, and the upper ends of each group of side upper web members share a node. Each group of side upper web members has one side upper web member inclined towards one side of the chord direction and another side upper web member inclined towards the other side of the chord direction. The adjacent groups of side upper web members share a node at the lower end. The upper and lower ends of the side upper web members at the ends are respectively located at the ends of the upper chord bar and the wing chord bar; the side lower web members are straight bars. The side lower web members are distributed at both ends of the lower chord bar and along the line. The upper ends of the side lower web members are welded to the wing chord bar and share a node with the lower ends of the side upper web members, and the lower ends are hinged to the lower chord bar and share a node with the lower ends of the central web members.

4. The long-span arched steel truss with diagonal supports according to claim 3, characterized in that: When fabricating each section of the steel truss, first fabricate the upper chord, lower chord, wing chord, center connecting rod, center web member, upper side web member, and lower side web member separately. Ensure that the upper chord, lower chord, and wing chord meet the length and radian requirements. Ensure that the corresponding center connecting rod, center web member, upper side web member, and lower side web member at each joint meet the length requirements, and mark the corresponding center connecting rod, center web member, upper side web member, and lower side web member at each joint. Then, determine and mark the positions of the joints and the connection positions of each connecting member along the upper chord, lower chord, and wing chord. Then, install a pair of upper chords and the center connecting rod between them first, and then install the lower chord and the center web member to form the main truss. Then, install the wing trusses on both sides of the main truss. When installing the wing trusses, first hinge and install the upper end of the upper side web member along the upper chord, hinge and install the lower end of the lower side web member along the lower chord, and then weld the wing chord to the lower end of the upper side web member and the upper end of the lower side web member.

5. The long-span arched steel truss with inclined supports as claimed in claim 1, wherein: The back-pull steel rod includes a steel rod and rod anchor heads provided at both ends of the steel rod. The rod anchor heads at both ends are respectively hinged to the lugs at the end of the upper chord and the lugs on the steel column base through pin shafts.

6. The long-span arched steel truss with inclined supports as claimed in claim 1, wherein: The H-shaped steel column includes a pair of steel columns and column anchor heads provided at both ends of the steel columns. The column anchor heads at both ends are respectively hinged to the lugs at the end of the lower chord and the lugs on the steel column base through pin shafts.

7. The long-span arch steel truss with inclined supports according to claim 1, characterized in that: The steel skeleton at the top of the steel reinforced concrete column is welded with an inclined frustum. The inclined direction of the frustum is the same as the inclined direction of the lower part of the H-shaped steel column on the corresponding side. The top surface of the frustum is an inclined plane, and the inclined direction of the top surface of the frustum is perpendicular to the inclined direction of the frustum. The bottom surface of the steel column base fits and supports on the top surface of the frustum and is welded.

8. A construction method of a long-span arched steel truss with inclined supports as described in any one of claims 1 to 7, characterized in that: First, use BIM technology to simulate the splicing, lifting, and support installation processes of the steel truss to ensure that the steel truss can be spliced correctly, lifted reliably, and installed accurately during on-site construction. On-site, first locate the axis and mark it, accurately locate the position of the steel reinforced concrete column and construct the steel reinforced concrete column. During construction, ensure the position accuracy and elevation of the steel skeleton of the steel reinforced concrete column. Then, directly or indirectly weld the steel column base to the top of the steel skeleton of the steel reinforced concrete column and ensure it is in the designed orientation of the steel column base. Then, assemble the steel truss in sections. After the assembly inspection is qualified, use multiple hydraulic lifters to synchronously lift the steel truss as a whole. First, lift a small distance and pause, and let it stand for a period of time. After checking that the steel truss and the hydraulic lifters are normal, continue to lift to the designed position. Then, install the H-shaped steel columns at both ends first, and then install the back-pull steel rods at both ends. After the steel truss reaches the designed state, withdraw the hydraulic lifters.

9. The construction method of the long-span arched steel truss with diagonal supports according to claim 8, characterized in that: The steel skeleton of the steel reinforced concrete column adopts a cross structure. When constructing the steel reinforced concrete column, first install the steel skeleton and determine its position accuracy and elevation, and then pour concrete. During the pouring process, monitor the position of the cross intersection at the top of the steel skeleton. If there is an offset, correct it immediately. The position and orientation of the steel column base are based on the cross intersection at the top of the steel skeleton.

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