Pi-shaped framework formed by fixedly connecting triangular-section lattice beams and A-shaped steel pipe columns

Abstract

The invention belongs to the technical field of electric power engineering construction, and relates to a pi-shaped framework for fixedly connecting a triangular section lattice beam and an A-shaped steel pipe column. Comprising A-shaped steel pipe columns and triangular-section lattice beams fixedly connected with the A-shaped steel pipe columns. An upper connecting base is arranged at the top of the A-shaped steel pipe column; brackets are arranged on the side faces of the two inclined steel pipes. The lattice beam with the triangular section comprises an upper chord member and two lower chord members; the upper chord member is respectively connected with the two lower chord members through web members; an upper chord concave base is arranged at the bottom of the upper chord; lower chord concave bases are arranged at the bottoms of the two lower chords; the upper chord member concave base is fixedly connected with the upper connecting base; the two lower chord member concave bases are fixedly connected with the two corbels respectively; the stability and anti-seismic performance of the framework are improved, meanwhile, the structure manufacturing cost can be reduced, the occupied area is saved, and wire hanging is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power engineering construction and relates to a π-shaped frame in which a triangular cross-section lattice beam is fixedly connected to an A-shaped steel pipe column. Background Art

[0002] In recent years, triangular cross-section lattice beams and A-shaped steel pipe columns have gradually become important components of substation structures due to their unique structural advantages.

[0003] The triangular cross-section lattice beam is widely used in large-span structures due to its advantages such as large cross-sectional stiffness, excellent torsional resistance and high material utilization. Its unique geometric shape can not only effectively disperse the load, but also significantly improve the overall stability and bearing capacity of the structure. At the same time, the A-shaped steel pipe column has become an ideal supporting structure in the substation frame due to its stable structure, reasonable force, beautiful shape, and easy factory processing and on-site installation. The design of the A-shaped steel pipe column can not only meet the requirements of engineering mechanics performance, but also take into account aesthetics and construction efficiency, so it has been widely recognized in the field of power engineering.

[0004] However, despite the excellent performance of triangular cross-section lattice beams and A-shaped steel pipe columns in their respective applications, the connection between the two in the existing main transformer transition π-shaped frame still adopts the traditional beam-column hinged structure. This connection method has the following problems: first, the hinged structure leads to poor synergistic force performance between beams and columns, making it difficult to give full play to the structural advantages of triangular cross-section lattice beams and A-shaped steel pipe columns; second, the material utilization rate of the hinged connection is low, resulting in a certain degree of resource waste; finally, due to the lack of force synergy and integrity of the overall structure, the stability and seismic performance of the structure are difficult to meet higher standards. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problems in the prior art and to provide a π-shaped frame in which a triangular cross-section lattice beam is fixedly connected to an A-shaped steel pipe column, which can fully utilize the high tensile, compressive and bending strength and good toughness of steel, thereby improving the stability and seismic resistance of the frame, while reducing the structural cost, saving floor space and facilitating the hanging of wires.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a π-shaped frame in which a triangular cross-section lattice beam is fixedly connected to an A-shaped steel pipe column, comprising an A-shaped steel pipe column and a triangular cross-section lattice beam fixedly connected thereto; The A-shaped steel pipe column comprises two inclined steel pipes; the two inclined steel pipes are symmetrically arranged at a preset angle, and the inclined steel pipes are connected by a cross bar to form an A-shaped structure; an upper connecting base is arranged on the top of the A-shaped steel pipe column; and brackets are arranged on the sides of the two inclined steel pipes; The triangular cross-section lattice beam comprises an upper chord and two lower chords; the upper chord is respectively connected to the two lower chords through a web member; a concave upper chord base is provided at the bottom of the upper chord; and a concave lower chord base is provided at the bottom of the two lower chords; The upper chord rod concave base is fixedly connected to the upper connecting base; the two lower chord rod concave bases are respectively fixedly connected to the two corbels.

[0007] Preferably, the upper connecting base includes an M-shaped steel base, a square steel plate and a triangular stiffening plate; the M-shaped steel base is arranged on the top of the square steel plate; the M-shaped steel base and the upper chord concave base are fixedly connected; one end of the triangular stiffening plate is connected to the bottom of the square steel plate, and the other end is connected to the side of the inclined steel pipe.

[0008] Preferably, a first bolt hole is provided on the M-shaped steel base; a third bolt hole is provided on the upper chord concave base; and the first bolt hole and the third bolt hole are connected by a first bolt.

[0009] Preferably, the corbel includes an upper steel plate, a transverse stiffening plate and a corbel stiffening plate; the top of the transverse stiffening plate is connected to the bottom of the upper steel plate, and the side of the transverse stiffening plate is connected to the corbel stiffening plate; the top of the corbel stiffening plate is connected to the bottom of the upper steel plate; the side of the corbel stiffening plate is connected to the side of the inclined steel pipe; the upper steel plate is fixedly connected to the concave base of the lower chord.

[0010] Preferably, a second bolt hole is provided on the upper steel plate; a fourth bolt hole is provided on the concave base of the lower chord; and the second bolt hole and the fourth bolt hole are connected by a second bolt.

[0011] Preferably, a corbel reinforcement ring is provided at the bottom of the corbel stiffening plate; the corbel reinforcement ring is connected to the side of the inclined steel pipe.

[0012] Preferably, a U-shaped stiffening plate is provided at the connection between the two inclined steel pipes; the top of the U-shaped stiffening plate is connected to the upper connecting base.

[0013] Preferably, a reinforcement ring is provided on the U-shaped stiffening plate; the reinforcement ring is connected to the side of the inclined steel pipe.

[0014] Preferably, the triangular cross-section lattice beam and the A-shaped steel pipe column are fixedly connected out of the plane.

[0015] In a second aspect, the present invention provides a method for installing a π-shaped frame by fixing a triangular cross-section lattice beam to an A-shaped steel pipe column, comprising the following steps: The upper steel plate, the corbel stiffening plate, the transverse stiffening plate and the corbel reinforcement ring are welded into a whole to form a corbel; the corbel is welded to the side of the A-shaped steel pipe column; the M-shaped steel base, the square steel plate and the triangular stiffening plate are welded together to form an upper connecting base, and the upper connecting base is welded to the top of the A-shaped steel pipe column; Weld an upper chord concave base at the bottom of the upper chord, and weld a lower chord concave base at the bottom of the lower chord; The upper connecting base and the concave base of the upper chord are fixedly connected, and the corbel and the concave base of the lower chord are fixedly connected to form a π-shaped frame in which the triangular cross-section lattice beam is fixedly connected to the A-shaped steel pipe column.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention is fixedly connected by the concave base of the upper chord and the upper connecting base; the two concave bases of the lower chord are respectively fixedly connected with the two corbels, which ensures the high strength and rigidity of the node, can effectively transfer the load and reduce the stress concentration, thereby improving the bearing capacity and anti-deformation capacity of the node, and at the same time, compared with the hinged connection, effectively reduces the overall calculated length coefficient of the A-shaped steel pipe column, thereby reducing the column cross section and saving construction costs; secondly, the present invention is supported on the A-shaped steel pipe column only by the concave base of the upper chord, which greatly reduces the size of the column top plate and the number of stiffeners, and at the same time The lightning rod is conveniently connected to the column top plate, avoiding the problem of the concave base of the lower chord of the beam colliding with the base of the lightning rod when the lattice beam is hingedly connected to the A-shaped steel pipe column; in addition, the present invention connects the triangular cross-section lattice beam to the A-shaped steel pipe column, so that the force is uniform at the mid-span of the beam and the support. Unlike the hinged connection, the force is the largest at the mid-span of the beam and the smallest at the support. The cross-sectional size of the triangular cross-sectional lattice beam is reduced accordingly, and the cross-sectional size of the beam steel pipe chord is also reduced accordingly. Due to the reduction in the cross-sectional size of the beam, the web of the beam is changed from the original slenderness ratio structural control to stable control, which improves the material utilization rate. Compared with the prior art, the present invention also saves the frame end support column, further improving the flexibility of the overall layout of the substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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 show certain 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.

[0018] Figure 1 It is a schematic diagram of a π-shaped frame in which a triangular cross-section lattice beam and an A-shaped steel pipe column are fixedly connected to each other in the present invention; Figure 2 A schematic diagram of a triangular cross-section lattice beam of the present invention; Figure 3for Figure 2 A partial enlarged view of the middle part; Figure 4 This is a schematic diagram of an A-shaped steel pipe column of the present invention; Figure 5 for Figure 4 A partial enlarged view of point B in the middle; Figure 6 It is a partial schematic diagram of the connection between the triangular cross-section lattice beam and the A-shaped steel pipe column of the present invention.

[0019] Figure 7 for Figure 6 A partial enlarged view of point C in the middle; Figure 8 for Figure 6 A partial enlarged view of point D in the middle.

[0020] Among them: 1. A-shaped steel pipe column; 11. upper connecting base; 111. M-shaped steel base; 1111. first bolt hole; 112. square steel plate; 113. triangular stiffening plate; 12. U-shaped stiffening plate; 13. reinforcement ring; 14. steel pipe; 15. corbel; 151. upper steel plate; 1511. second bolt hole; 152. transverse stiffening plate; 153. corbel stiffening plate; 154. corbel reinforcement ring; 2. triangular section lattice beam; 21. upper chord; 22. lower chord; 23. concave base of upper chord; 231. third bolt hole; 24. concave base of lower chord; 241. first bolt; 242. second bolt; 243. fourth bolt hole; 25. web member. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, welding, detachable connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings: The first object of the present invention is to provide a π-shaped frame with a triangular cross-section lattice beam and an A-shaped steel pipe column fixedly connected. Figure 1 As shown, it includes an A-shaped steel pipe column 1 and a triangular cross-section lattice beam 2 fixedly connected thereto; like Figures 2 to 8 As shown, the A-shaped steel pipe column 1 includes two inclined steel pipes 14; the two inclined steel pipes 14 are symmetrically arranged at a preset angle to form an "A"-shaped structure, which can effectively disperse vertical and horizontal loads and improve the bending and shear resistance of the overall structure; an upper connecting base 11 is arranged on the top of the A-shaped steel pipe column 1; and the sides of the two inclined steel pipes 14 are both provided with brackets 15; The triangular cross-section lattice beam 2 includes an upper chord 21 and two lower chords 22; the upper chord 21 is connected to the two lower chords 22 respectively through a web member 25, and a stable triangular cross-section is formed by the upper chord 21, the lower chord 22 and the web member 25, thereby further enhancing the overall rigidity and stability of the structure; an upper chord concave base 23 is provided at the bottom of the upper chord 21; and a lower chord concave base 24 is provided at the bottom of the two lower chords 22.

[0028] The upper chord concave base 23 is fixedly connected to the upper connecting base 11; the two lower chord concave bases 24 are respectively fixedly connected to the two corbels 15, ensuring the high strength and rigidity of the node, being able to effectively transfer loads and reduce stress concentration, thereby improving the bearing capacity and anti-deformation ability of the node.

[0029] The upper connecting base 11 includes an M-shaped steel base 111, a square steel plate 112 and a triangular stiffening plate 113; the M-shaped steel base 111 is arranged on the top of the square steel plate 112; the M-shaped steel base 111 is fixedly connected to the concave base 23 of the upper chord; one end of the triangular stiffening plate 113 is connected to the bottom of the square steel plate 112, and the other end is connected to the side of the inclined steel pipe 14.

[0030] The unique cross-sectional shape of the M-shaped steel base 111 can effectively disperse and transfer the load of the upper structure, reduce local stress concentration, and improve the bearing capacity of the node; the square steel plate 112, as the core component connecting the top of the A-shaped steel pipe column 1, provides a large contact area and support surface, further enhancing the overall stiffness and stability of the node. The design of the triangular stiffening plate 113 further enhances the bending and shear resistance of the node, effectively preventing the node from deformation or damage under load.

[0031] The corbel 15 includes an upper steel plate 151, a transverse stiffening plate 152 and a corbel stiffening plate 153; the top of the transverse stiffening plate 152 is connected to the bottom of the upper steel plate 151, and the side of the transverse stiffening plate 152 is connected to the corbel stiffening plate 153; the top of the corbel stiffening plate 153 is connected to the bottom of the upper steel plate 151; the side of the corbel stiffening plate 153 is connected to the side of the inclined steel pipe 14; the upper steel plate 151 is fixedly connected to the concave base 24 of the lower chord. A corbel reinforcement ring 154 is provided at the bottom of the corbel stiffening plate 153; the corbel reinforcement ring 154 is connected to the side of the inclined steel pipe 14. The top of the transverse stiffening plate 152 is connected to the bottom of the upper steel plate 151, and a stable supporting structure is formed with the corbel stiffening plate 153, which significantly improves the overall shear and bending resistance of the corbel and prevents the node from being deformed or damaged under load. The design of the corbel reinforcement ring 154 further enhances the rigidity and torsion resistance of the node, thereby ensuring the overall stability of the node.

[0032] The corbel 15 adopts a modular design. The upper steel plate 151, the transverse stiffening plate 152, the corbel stiffening plate 153 and the corbel reinforcement ring 154 can be prefabricated in the factory and welded in advance to form a whole. On site, it is only necessary to weld the whole to the side of the inclined steel pipe 14, which significantly reduces the construction difficulty and time cost.

[0033] The M-shaped steel base 111 is provided with a first bolt hole 1111 ; the upper chord concave base 23 is provided with a third bolt hole 231 ; the first bolt hole 1111 and the third bolt hole 231 are connected by a first bolt 241 .

[0034] The upper steel plate 151 is provided with a second bolt hole 1511 ; the lower chord concave base 24 is provided with a fourth bolt hole 243 ; the second bolt hole 1511 and the fourth bolt hole 243 are connected by a second bolt 242 .

[0035] Among them, if there are multiple first bolts 241 and second bolts 242, the same number of first bolt holes 1111 and third bolt holes 231 as the first bolts 241 are set, and the same number of second bolt holes 1511 and fourth bolt holes 243 as the second bolts 242 are set; that is, the first bolts 241 and the first bolt holes 1111 and the third bolt holes 231 correspond one-to-one, and the second bolts 242 and the second bolt holes 1511 and the fourth bolt holes 243 correspond one-to-one.

[0036] Exemplarily, four first bolt holes 1111 are reserved on the M-shaped steel base 111, and are respectively located at the four corners of the M-shaped steel base 111; four third bolt holes 231 are reserved on the upper chord rod concave base 23, and are respectively located at the four corners of the upper chord rod concave base 23; two second bolt holes 1511 are reserved on the upper steel plate 151, and are respectively located at the long midline of the upper steel plate 151 at a bisecting position; two fourth bolt holes 243 are reserved on the lower chord rod concave base 24, and correspond to the positions of the two second bolt holes 1511 reserved on the upper steel plate 151. In addition, the number of the first bolts 241 and the second bolts 242 can be set according to actual needs.

[0037] The M-shaped steel base 111 and the upper chord concave base 23, as well as the upper steel plate 151 and the lower chord concave base 24 are connected by bolts to provide reliable fastening force, which can resist the influence of dynamic loads such as vibration and wind load, and enhance the fatigue resistance and long-term reliability of the node; at the same time, the bolt connection method simplifies the on-site construction process, eliminates the need for complicated welding operations, and reduces the construction difficulty and technical requirements.

[0038] The present invention also provides a U-shaped stiffening plate 12 at the connection of the two inclined steel pipes 14; the top of the U-shaped stiffening plate 12 is connected to the upper connecting base 11 to form a stable triangular support structure, which enhances the bending and shearing resistance of the node and effectively prevents the node from being deformed or damaged under load; a reinforcement ring 13 is provided on the U-shaped stiffening plate 12; the reinforcement ring 13 is connected to the side of the inclined steel pipe 14, which further enhances the stiffness and torsional resistance of the node and ensures the overall stability of the node.

[0039] The triangular cross-section lattice beam 2 and the A-shaped steel pipe column 1 are fixedly connected outside the plane. The out-of-plane fixed connection method enables the triangular cross-section lattice beam 2 and the A-shaped steel pipe column 1 to form a rigid connection in a direction perpendicular to the plane of the A-shaped steel pipe column 1, which significantly improves the overall stiffness and stability of the structure, can effectively resist the effects of lateral forces such as wind loads and earthquake loads, and prevent the structure from deforming or becoming unstable outside the plane.

[0040] The triangular cross-section lattice beam of the present invention is fixedly connected to the A-shaped steel pipe column in a π-shaped frame. Compared with the hinged connection, the triangular cross-section lattice beam 2 and the A-shaped steel pipe column 1 are fixedly connected, which can effectively reduce the overall calculated length coefficient outside the plane of the A-shaped steel pipe column 1, thereby reducing the column section. The use of fixed connection can effectively improve the integrity and safety reserve of the entire frame. Secondly, when the triangular cross-section lattice beam 2 of the present invention is fixedly connected to the A-shaped steel pipe column 1, the force at the mid-span and the support of the beam is uniform, the structure is significantly coordinated, and the material utilization rate is improved. At the same time, it can effectively solve the technical problem of reliable connection of the beam-column connection node of the substation frame structure, and has significant social and economic benefits.

[0041] A second object of the present invention is to provide a method for installing a π-shaped frame by fixing a triangular cross-section lattice beam to an A-shaped steel pipe column, comprising the following steps: The upper steel plate 151, the transverse stiffening plate 152, the corbel stiffening plate 153 and the corbel reinforcement ring 154 are welded into a whole to form a corbel 15; the corbel 15 is welded to the side of the A-shaped steel pipe column 1; the M-shaped steel base 111, the square steel plate 112 and the triangular stiffening plate 113 are welded together to form an upper connecting base 11, and the upper connecting base 11 is welded to the top of the A-shaped steel pipe column 1; An upper chord rod concave base 23 is welded at the bottom of the upper chord rod 21, and a lower chord rod concave base 24 is welded at the bottom of the lower chord rod 22; The upper connecting base 11 and the upper chord concave base 23 are fixedly connected, and the corbel 15 and the lower chord concave base 24 are fixedly connected to form the π-shaped frame in which the triangular cross-section lattice beam and the A-shaped steel pipe column are fixedly connected.

[0042] The method of the present invention realizes modular design, simplifies the on-site installation steps, and improves the construction efficiency by welding the upper steel plate 151, the transverse stiffening plate 152, the bracket stiffening plate 153 and the bracket reinforcement ring 154 into the bracket 15, and welding the M-shaped steel base 111, the square steel plate 112 and the triangular stiffening plate 113 into the upper connecting base 11. Secondly, the upper chord rod 21 and the lower chord rod 22 are respectively connected to the upper connecting base 11 and the bracket 15 through the upper chord rod concave base 23 and the lower chord rod concave base 24, thereby enhancing the structural integrity. The overall stability and bearing capacity of the structure are improved; in addition, the combination of welding and bolt connection ensures the reliability of the connection and avoids the risk of loosening. At the same time, the design of the corbel reinforcement ring 154 and the triangular stiffening plate 113 further improves the strength and seismic performance of the key nodes; the present invention is suitable for a single-span π-type frame without end braces, and can be extended to a single-span or multi-span portal frame without end braces. It has the characteristics of easy installation, stable structure and good economy, can effectively reduce construction costs and shorten construction period, and has broad application prospects.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A π-shaped frame with a triangular cross-section lattice beam and an A-shaped steel pipe column fixedly connected, characterized in that: It comprises an A-shaped steel pipe column (1) and a triangular cross-section lattice beam (2) fixedly connected thereto; The A-shaped steel pipe column (1) comprises two inclined steel pipes (14); the two inclined steel pipes (14) are symmetrically arranged at a preset angle, and the inclined steel pipes (14) are connected by a cross bar to form an A-shaped structure; an upper connecting base (11) is arranged at the top of the A-shaped steel pipe column (1); and brackets (15) are arranged on the sides of the two inclined steel pipes (14); The triangular cross-section lattice beam (2) comprises an upper chord (21) and two lower chords (22); the upper chord (21) is respectively connected to the two lower chords (22) via a web member (25); an upper chord concave base (23) is provided at the bottom of the upper chord (21); and a lower chord concave base (24) is provided at the bottom of the two lower chords (22); The upper chord rod concave base (23) is fixedly connected to the upper connection base (11); and the two lower chord rod concave bases (24) are respectively fixedly connected to the two brackets (15).

2. The π-shaped frame of a triangular cross-section lattice beam and an A-shaped steel pipe column fixedly connected according to claim 1, characterized in that: The upper connection base (11) comprises an M-shaped steel base (111), a square steel plate (112) and a triangular stiffening plate (113); the M-shaped steel base (111) is arranged on the top of the square steel plate (112); the M-shaped steel base (111) and the upper chord rod concave base (23) are fixedly connected; one end of the triangular stiffening plate (113) is connected to the bottom of the square steel plate (112), and the other end is connected to the side of the inclined steel pipe (14).

3. The π-shaped frame of a triangular cross-section lattice beam fixedly connected to an A-shaped steel pipe column according to claim 2, characterized in that: The M-shaped steel base (111) is provided with a first bolt hole (1111); the upper chord concave base (23) is provided with a third bolt hole (231); the first bolt hole (1111) and the third bolt hole (231) are connected by a first bolt (241).

4. The π-shaped frame of a triangular cross-section lattice beam and an A-shaped steel pipe column fixedly connected according to claim 1, characterized in that: The corbel (15) comprises an upper steel plate (151), a transverse stiffening plate (152) and a corbel stiffening plate (153); the top of the transverse stiffening plate (152) is connected to the bottom of the upper steel plate (151), and the side of the transverse stiffening plate (152) is connected to the corbel stiffening plate (153); the top of the corbel stiffening plate (153) is connected to the bottom of the upper steel plate (151); the side of the corbel stiffening plate (153) is connected to the side of the inclined steel pipe (14); and the upper steel plate (151) is fixedly connected to the concave base (24) of the lower chord.

5. The π-shaped frame of a triangular cross-section lattice beam fixedly connected to an A-shaped steel pipe column according to claim 4, characterized in that: The upper steel plate (151) is provided with a second bolt hole (1511); the lower chord concave base (24) is provided with a fourth bolt hole (243); the second bolt hole (1511) and the fourth bolt hole (243) are connected by a second bolt (242).

6. The π-shaped frame of a triangular cross-section lattice beam and an A-shaped steel pipe column fixedly connected according to claim 4, characterized in that: A corbel reinforcement ring (154) is provided at the bottom of the corbel stiffening plate (153); the corbel reinforcement ring (154) is connected to the side of the inclined steel pipe (14).

7. The π-shaped frame of a triangular cross-section lattice beam and an A-shaped steel pipe column fixedly connected according to claim 1, characterized in that: A U-shaped stiffening plate (12) is provided at the connection between the two inclined steel pipes (14); the top of the U-shaped stiffening plate (12) is connected to the upper connection base (11).

8. The π-shaped frame of a triangular cross-section lattice beam fixedly connected to an A-shaped steel pipe column according to claim 7, characterized in that: The U-shaped stiffening plate (12) is provided with a reinforcement ring (13); the reinforcement ring (13) is connected to the side of the inclined steel pipe (14).

9. The π-shaped frame of a triangular cross-section lattice beam fixedly connected to an A-shaped steel pipe column according to claim 1, characterized in that: The triangular cross-section lattice beam (2) and the A-shaped steel pipe column (1) are fixedly connected outside the plane.

10. The method for installing a π-shaped frame of a triangular cross-section lattice beam and an A-shaped steel pipe column according to any one of claims 1 to 9, characterized in that: The following steps are involved: The upper steel plate (151), the bracket stiffening plate (152), the transverse stiffening plate (153) and the bracket reinforcement ring (154) are welded into a whole to form a bracket (15); the bracket (15) is welded to the side of the A-shaped steel pipe column (1); the M-shaped steel base (111), the square steel plate (112) and the triangular stiffening plate (113) are welded together to form an upper connection base (11), and the upper connection base (11) is welded to the top of the A-shaped steel pipe column (1); An upper chord rod concave base (23) is welded at the bottom of the upper chord rod (21), and a lower chord rod concave base (24) is welded at the bottom of the lower chord rod (22); The upper connecting base (11) and the upper chord concave base (23) are fixedly connected, and the corbel (15) and the lower chord concave base (24) are fixedly connected to form a π-shaped frame in which the triangular cross-section lattice beam is fixedly connected to the A-shaped steel pipe column.

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