A support conversion structure for heavy-load equipment on top of a heat absorbing tower and a method of using the same

Abstract

The present invention belongs to the technical field of tower solar thermal power generation, and specifically provides a support conversion structure and a use method of a heavy-load equipment on the top of a heat absorption tower. The heavy-load equipment is installed on the top of the heat absorption tower through the support conversion structure. The support conversion structure includes a spatial steel truss and a top plate. The spatial steel truss includes an upper chord beam and a lower chord beam. The upper chord beam is connected to the lower chord beam below. A tower wall beam socket is opened on the top of the tower wall of the heat absorption tower. The inner wall of the tower wall of the heat absorption tower is provided with a tower wall corbel. There are multiple spatial steel trusses. The upper chord beams of the multiple spatial steel trusses are connected to the top of the heat absorption tower through the tower wall beam socket. The top plate is placed on the top surface of the upper chord beam, and the lower chord beams of the multiple spatial steel trusses are connected to the top surface of the tower wall corbel. The present invention realizes the support and conversion of heavy-load equipment, meets the requirements of overall force and coordinated deformation under wind load, and its stiffness and bearing capacity design method can also be applied to the conversion structure of other high-rise structures.

Description

Technical Field

[0001] The present invention belongs to the technical field of tower solar thermal power generation, and in particular relates to a support conversion structure for heavy-load equipment on the top of a heat absorption tower and a use method thereof. Background Art

[0002] In the tower molten salt solar thermal power generation system, the heat absorption tower is the core structure of the tower solar power station, and the total height of the structure is generally more than 150m. As one of the core equipment, the absorber is located at the top of the heat absorption tower, gathering the high heat flux density radiation energy reflected by several heliostats on the ground. The outer surface of the exposed tube heat absorber is welded together by a large number of vertically parallel straight tubes to form a strip heat absorption plate. The heat absorption plate is spliced ​​into a cylindrical shape. The heat transfer fluid header is arranged inside and on the top to supply cold heat transfer fluid to the heat absorber and collect the heated heat transfer fluid. The weight of the heat absorption tower is generally 1,000 to 3,500 tons, making the heat absorption tower a special "top-heavy" tall structure.

[0003] The heat absorption tower is different from tall structures such as chimneys and TV towers. The top area of ​​the tower is equipped with air compression tanks, electrical distribution cabinets, equipment layers, etc., which are mainly manifested in uneven distribution of structural mass, uneven distribution of structural stiffness, and obvious sudden changes in the top shape of the tower. At present, there is no special design specification for the heat absorption tower structure. As a heavy-load equipment, the form of the tower top conversion structure and the connection method of the supporting nodes should be the top priority in the design of the heat absorption tower structure. The main design difficulties of the tower top conversion structure are:

[0004] 1) The absorber equipment and its supporting frame should be considered as part of the absorber tower structure and undergo overall modal analysis. The values ​​of its dynamic parameters (period, vibration mode coefficient, damping ratio, etc.) will greatly affect the calculation results of wind vibration and earthquake effects. Therefore, the actual conversion structure should be strictly consistent with the mechanical analysis model and meet the swing limit of the absorber during normal use.

[0005] 2) Based on previous experience in earthquake analysis of tall structures, top components with sudden changes in shape and stiffness, especially in high-intensity areas, have large horizontal displacements, accompanied by an obvious "whip effect", making it difficult to design to meet the strength and stiffness indicators of the overall structure.

[0006] 3) Due to the high height of the tower top, the design of the conversion structure is based on the premise of high-altitude operation, which can reduce the difficulty of construction hoisting and installation and shorten the construction period to the maximum extent. Summary of the invention

[0007] The purpose of the present invention is to provide a support conversion structure for heavy-load equipment on the top of a heat absorption tower, so that the heat absorber can be successfully transferred to the top of the heat absorption tower through the conversion structure, while meeting the strength and stiffness requirements of the supporting structure, providing strong technical support for the future design and application of the heat absorption tower.

[0008] Another object of the present invention is to provide a method for using a supporting conversion structure for heavy-load equipment at the top of a heat absorption tower, provide a layout method for ensuring the rigidity of a spatial steel truss structure, and a connection method for ensuring the bearing capacity of the conversion structure and the tower wall. Combined with the actual application of the project, the steel truss conversion structure of the present invention has good applicability and reliability.

[0009] To this end, the present invention provides a support conversion structure for a heavy-load equipment at the top of a heat absorption tower, wherein the heavy-load equipment is installed on the top of the heat absorption tower through the support conversion structure, the heavy-load equipment includes a heat absorber and a support steel column, the heat absorber is installed on the support conversion structure through the support steel column, the support conversion structure includes a spatial steel truss and a top plate, the spatial steel truss includes an upper chord beam and a lower chord beam, the upper chord beam is connected to the lower chord beam below, a tower wall beam socket is opened on the top of the tower wall of the heat absorption tower, a tower wall corbel is arranged on the inner wall of the tower wall of the heat absorption tower, and there are multiple spatial steel trusses, the upper chord beams of the multiple spatial steel trusses are connected to the top of the heat absorption tower through the tower wall beam socket, the top surface of the upper chord beam is connected to the top plate, and the lower chord beams of the multiple spatial steel trusses are connected to the top surface of the tower wall corbel.

[0010] The spatial steel truss also includes a plurality of upper chord outer arms and upper chord connecting beams. Each upper chord outer arm is cross-connected with the upper chord beam, and the upper chord outer arms of two adjacent spatial steel trusses are connected via an upper chord connecting beam.

[0011] The spatial steel truss also includes a plurality of column foot rigid support nodes, and the intersection area of ​​the upper chord beam and the outer arm of the upper chord beam is connected to a column foot rigid support node.

[0012] The spatial steel truss also includes a horizontal support, and the lower chord beams of multiple spatial steel trusses are connected by the horizontal support.

[0013] The spatial steel truss also includes a plurality of web members, and the upper chord beam is connected to the lower chord beam through the plurality of web members, wherein a web member is provided below each column foot rigid support node.

[0014] The upper chord beam, lower chord beam, web member, upper chord beam outer arm and upper chord connecting beam all adopt wide flange H-shaped steel, and the wide flange H-shaped steel includes an upper flange, a lower flange and a vertical connecting plate. The upper flange and the lower flange are arranged in parallel, and the middle parts of the upper flange and the lower flange are connected by a vertical connecting plate.

[0015] The column base rigid support node includes horizontal reinforcing ribs and vertical reinforcing ribs. The inner sides of the upper flange and the lower flange of the intersection area of ​​the upper chord beam and the outer arm of the upper chord beam are horizontally connected to the horizontal reinforcing ribs. The upper flange and the lower flange of the intersection area of ​​the upper chord beam and the outer arm of the upper chord beam are vertically connected to the vertical reinforcing ribs.

[0016] The tower wall beam socket is a rectangular lower recess.

[0017] The multiple spatial steel trusses are arranged according to the arrangement of the support steel columns, and the upper chord beam is positioned consistently with the support steel columns.

[0018] A method for using a support conversion structure for heavy-load equipment on the top of a heat absorbing tower, wherein multiple spatial steel trusses are arranged according to the arrangement of support steel columns in the heavy-load equipment on the top of the heat absorbing tower, wherein an upper chord beam is positioned consistently with the support steel column, a web bar is connected to the top of a lower chord beam below the upper chord beam, the upper chord beam is cantilevered through a beam socket on a tower wall, and edge beams are used to connect and surround the cantilevered sections in sequence, an end of the lower chord beam is connected to the top surface of a tower wall corbel, and a top plate is placed on top of the upper chord beam.

[0019] Beneficial effects of the present invention:

[0020] 1. The support conversion structure of the heavy-load equipment on the top of the heat absorption tower provided by the present invention not only has good integrity and strong stability, but also has the advantages of clear, safe and reliable force transmission by transmitting internal forces such as bending moment and shear force from the upper and lower parts by means of the tower wall beam sockets and tower wall corbels respectively;

[0021] 2. The support conversion structure for the heavy-load equipment on the top of the heat absorption tower provided by the present invention has a column foot rigid support node at the intersection area of ​​the upper chord beam and the outer arm of the upper chord beam. This "box-type" column foot rigid support node firmly fixes the column foot of the upper heavy-load equipment bracket. Calculations show that when vibrating in the downwind and acrosswind directions, the upper heat absorber equipment and the tower top structure can deform synergistically to meet the swing limit of the heat absorber during normal use, significantly reducing the adverse effects caused by sudden changes in vertical stiffness.

[0022] 3. The supporting conversion structure of the heavy-load equipment on the top of the heat absorption tower provided by the present invention can be prefabricated and assembled in the factory, and only a small amount of welding or casting is required after high-altitude hoisting. It is faster and more convenient to construct than the general beam-type and thick plate-type conversion structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below with reference to the accompanying drawings.

[0024] Figure 1 is a top view of the structure of the upper chord beam in one embodiment of the present invention;

[0025] Figure 2 is a top view of the structure of a lower chord beam according to an embodiment of the present invention;

[0026] Figure 3 It is the main structural view of the spatial steel truss;

[0027] Figure 4 It is a top view of the structure of the rigid support node at the column base;

[0028] Figure 5 yes Figure 41-1 structural cross-sectional view;

[0029] Figure 6 This is a top view of the tower wall beam socket structure;

[0030] Figure 7 This is the main view of the tower wall beam socket structure;

[0031] Figure 8 This is the main view of the tower wall corbel and lower chord beam connection structure.

[0032] Explanation of the reference numerals in the accompanying drawings: 1. Spatial steel truss; 2. Rigid support node at the column foot; 3. Upper chord connecting beam; 4. Horizontal support; 5. Upper chord beam; 6. Lower chord beam; 7. Web member; 8. Outer arm of upper chord beam; 9. Horizontal reinforcing rib; 10. Vertical reinforcing rib; 11. Top plate; 12. Column foot bolt; 13. Tower wall beam socket; 14. Tower wall corbel; 15. Support steel column; 16. Heat absorption tower wall. DETAILED DESCRIPTION

[0033] Embodiment 1:

[0034] like Figure 1 , 3 As shown in 5-8, a support conversion structure for a heavy-load equipment at the top of a heat absorption tower, the heavy-load equipment is installed on the top of the heat absorption tower through the support conversion structure, the heavy-load equipment includes a heat absorber and a support steel column 15, the heat absorber is installed on the support conversion structure through the support steel column 15, the support conversion structure includes a spatial steel truss 1 and a top plate 11, the spatial steel truss 1 includes an upper chord beam 5 and a lower chord beam 6, the upper chord beam 5 is connected to the lower chord beam 6 at the bottom, a tower wall beam socket 13 is opened on the top of the tower wall 16 of the heat absorption tower, and a tower wall corbel 14 is arranged on the inner wall of the tower wall 16 of the heat absorption tower, the number of spatial steel trusses 1 is multiple, the upper chord beams 5 of the multiple spatial steel trusses 1 are connected to the top of the heat absorption tower through the tower wall beam socket 13, the top surface of the upper chord beam 5 is connected to the top plate 11, and the lower chord beams 6 of the multiple spatial steel trusses 1 are connected to the top surface of the tower wall corbel 14.

[0035] The supporting conversion structure of the heavy-load equipment on the top of the heat absorbing tower of the present invention has an upper chord beam 5 cantilevered out of the tower wall 16 of the heat absorbing tower through the tower wall beam socket 13, and together with the top plate 11, forms a tower top roof system, which has good integrity and strong stability; with the tower wall beam socket 13, part of the bending moment, shear force and axial force borne by the space steel truss 1 is transmitted to the tower wall from the top; with the tower wall corbel 14, the remaining bending moment, shear force and axial force borne by the space steel truss 1 is transmitted to the tower wall from the bottom; it has the advantages of clear, safe and reliable force transmission. The top plate 11 is a concrete slab directly placed on the upper chord beam 5, and the thickness and reinforcement are determined according to the structural requirements, which plays a protective role such as shielding rain and snow.

[0036] Embodiment 2:

[0037] On the basis of Example 1, the spatial steel truss 1 further includes a plurality of upper chord outer arms 8 and upper chord connecting beams 3, each upper chord outer arm 8 is cross-connected with the upper chord beam 5, and the upper chord outer arms 8 of two adjacent spatial steel trusses 1 are connected via the upper chord connecting beam 3.

[0038] The upper chord connecting beam 3 is an extension of the upper chord outer arm 8 and is used to connect multiple spatial steel trusses 1 so that the upper parts of the spatial steel trusses 1 are stressed as a whole, thereby strengthening the transverse and longitudinal stiffness of the spatial steel trusses 1 themselves.

[0039] Furthermore, the spatial steel truss 1 also includes a plurality of column foot rigid support nodes 2, and the intersection area of ​​the upper chord beam 5 and the upper chord beam outer arm 8 is connected to a column foot rigid support node 2. The column foot rigid support node 2 is used to directly support the absorber support steel column 15, bear the load of all upper heavy-load equipment, and transmit the internal force to the spatial steel truss 1 structure.

[0040] like Figure 2 As shown, further, the spatial steel truss 1 further includes a horizontal support 4, and the lower chord beams 6 of the multiple spatial steel trusses 1 are connected by the horizontal support 4. The lower chord beams 6 of the multiple spatial steel trusses 1 are connected by the horizontal support 4 to strengthen the integrity and stability of the lower part of the spatial steel truss 1.

[0041] Furthermore, the horizontal support 4 is made of round steel pipes arranged crosswise, which are used to connect the lower chord beam 6 of the spatial steel truss 1. The ends of the horizontal support 4 are hingedly connected, so that the lower part of the spatial steel truss 1 is stressed as a whole, the structure is simple, and the transverse and longitudinal stiffness of the spatial steel truss 1 itself is further strengthened; the hinged connection has high strength, light weight, good integrity and seismic performance.

[0042] Furthermore, the spatial steel truss 1 further includes a plurality of web members 7, and the upper chord beam 5 is connected to the lower chord beam 6 through the plurality of web members 7, wherein a web member 7 is provided below each column foot rigid support node 2. The web member 7 is provided below the column foot rigid support node 2 to improve the seismic resistance and deformation capacity of the column foot rigid support node 2.

[0043] Furthermore, the upper chord beam 5, the lower chord beam 6, the web member 7, the upper chord beam outer arm 8 and the upper chord connecting beam 3 all adopt wide flange H-shaped steel, and the wide flange H-shaped steel includes an upper flange, a lower flange and a vertical connecting plate. The upper flange and the lower flange are arranged in parallel, and the middle parts of the upper flange and the lower flange are connected by a vertical connecting plate.

[0044] Wide flange H-shaped steel has wide flange, large lateral stiffness and strong bending resistance; the upper flange and the lower flange are parallel to each other, which makes the connection, processing and installation simple, saves costs, and has a light structure, high stability and high structural strength.

[0045] Furthermore, the column base rigid support node 2 includes horizontal reinforcing ribs 9 and vertical reinforcing ribs 10, the inner sides of the upper flange and the lower flange of the intersection area of ​​the upper chord beam 5 and the upper chord beam outer arm 8 are horizontally connected to the horizontal reinforcing ribs 9, and the upper flange and the lower flange of the intersection area of ​​the upper chord beam 5 and the upper chord beam outer arm 8 are vertically connected to the vertical reinforcing ribs 10.

[0046] The outer arm 8 of the upper chord beam must be arranged at the rigid support node 2 of the column foot, and is appropriately arranged at the connection between the upper chord beam 5 and the web member 7. The outer arm 8 of the upper chord beam is orthogonal to the upper chord beam 5 at 90°. The outward extension length of the outer arm 8 of the upper chord beam is 1.0 to 1.5 times the width of the upper chord beam 5. The outer arm 8 of the upper chord beam and the upper chord beam 5 are required to be rigidly connected with each other with equal cross-section and equal strength. The outer arm 8 of the upper chord beam plays a role in strengthening the out-of-plane stability of the spatial steel truss 1. At the same time, the outer arm 8 of the upper chord beam, as a part of the rigid support node 2 of the column foot, can be prefabricated in the factory together with the spatial steel truss 1 as a part of the spatial steel truss 1, which greatly reduces the workload of high-altitude lifting and installation operations.

[0047] like Figure 4 As shown, further, the thickness of the horizontal reinforcing rib 9 is greater than or equal to the thickness of the upper flange or the lower flange, the width of the horizontal reinforcing rib 9 is 2 / 3 of the width of the upper chord beam 5, the number of the vertical reinforcing ribs 10 is multiple, and the multiple vertical reinforcing ribs 10 are arranged in a triangle and a polygon, and the thickness of the vertical reinforcing ribs 10 is greater than or equal to the thickness of the web 7; this kind of "box-shaped" design method can greatly enhance the bending and torsional stiffness of the rigid node, firmly fix the upper bracket, and deform in coordination with the tower top; through the "box-type" rigid support node 2, the upper heat absorber bracket column foot 15 is firmly fixed. Calculations show that when vibrating in the downwind and acrosswind directions, the upper heat absorber equipment and the tower top structure can deform in coordination to meet the swing limit of the heat absorber during normal use, and significantly reduce the adverse effects caused by sudden changes in vertical stiffness.

[0048] Furthermore, the rigid support node 2 also includes column base bolts 12, which pass through the top plate 11, the horizontal reinforcing ribs 9 under the upper flange, and the horizontal reinforcing ribs 9 above the lower flange from top to bottom; the connection is convenient, the structure is simple, and the overall stability of the rigid support node 2 is improved.

[0049] Furthermore, there are multiple column base bolts 12, and the multiple column base bolts 12 are evenly and symmetrically distributed on the rigid support node 2, thereby improving the stability of the overall structure of the rigid support node 2.

[0050] Furthermore, the tower wall beam socket 13 is a rectangular lower notch. The rectangular lower notch has a simple structure and can stably place the upper chord beam 5 in the tower wall of the heat absorption tower.

[0051] Furthermore, the width of the tower wall beam socket 13 is 100 mm wider than the upper chord beam 5, and the reserved height of the tower wall beam socket 13 is equal to the beam height of the upper chord beam 5 + the warping deformation, and the warping deformation is 10-15 mm; ensuring that the upper chord beam 5 is completely placed in the tower wall of the heat absorption tower and has high stability.

[0052] Furthermore, reinforcing steel bars are arranged in the rectangular lower recess to improve the stability of the connection, so that the tower wall beam socket 13 firmly supports the upper chord beam 5, and transmits part of the bending moment, shear force and axial force borne by the spatial steel truss to the tower wall.

[0053] Furthermore, both ends of the lower chord beam 6 are connected to the tower wall brackets 14 through steel embedded parts and bolts.

[0054] The tower wall corbel 14 is arranged on the side wall of the tower wall 16 of the heat absorption tower. The tower wall corbel 14 corresponds to the lower chord beam 6 of each spatial steel truss 1. The height and width of the tower wall corbel 14 are determined by its crack control requirements. Steel embedded parts and high-strength bolts are arranged on the top of the tower wall corbel 14 to fix the end of the lower chord beam 6. The lower chord beam 6 is supported by the tower wall corbel 14 to transfer the remaining bending moment, shear force and axial force borne by the spatial steel truss 1 to the tower wall.

[0055] Furthermore, the multiple spatial steel trusses 1 are arranged according to the arrangement of the support steel columns 15, and the upper chord beam 5 is positioned in the same manner as the support steel columns 15. The upper chord beam 5 is positioned in the same manner as the support steel columns 15 to achieve a rigid support node at the column foot.

[0056] Furthermore, the multiple spatial steel trusses 1 are arranged in parallel and symmetrically relative to the center of the heat absorption tower wall 16, thereby realizing a rigid support node at the column foot and improving the seismic resistance and deformation capacity of the node.

[0057] Furthermore, the cross-sectional stiffness of the upper chord beam 5 is 1.5 to 2.0 times that of the lower chord beam 6 ; since the upper chord beam 5 is a direct bearing member of the absorber support steel column 15 , the structure can improve the overall load-bearing capacity, seismic performance and deformation capacity.

[0058] Furthermore, it also includes edge beams, and the upper chord beams 5 of the multiple spatial steel trusses 1 outside the tower wall beam sockets 13 are connected by edge beams. The upper chord beams 5 are cantilevered for a distance through the tower wall beam sockets 13, and the cantilevered sections are sequentially connected to form a circle using edge beams. The advantages of this method are that the integrity and firmness of the connection between the upper part of the spatial steel truss 1 and the tower wall are ensured, and the use space of the tower top is expanded by using the spatial steel trusses in the tower, saving construction costs.

[0059] Furthermore, the web members 7 include oblique web members and vertical web members; the oblique web members and vertical web members are distributed as required, and the cross-sectional stiffness of the oblique web members at the ends of the lower chord beam 6 is about 1.5 times that of the middle webs, which meets the force requirements and further strengthens the integrity and firmness of the connection between the spatial steel truss 1 and the tower wall.

[0060] Furthermore, the upper chord connecting beam 3 and the upper chord outer arm 8 are rigidly butted with equal cross-section and equal strength, and are used to connect adjacent space steel trusses 1, so that the upper parts of the space steel trusses 1 are stressed as a whole, and the transverse and longitudinal rigidity of the space steel trusses 1 are strengthened.

[0061] The support conversion structure of the heavy-load equipment on the top of the heat absorption tower of the present invention can be prefabricated and assembled in the factory, and only a small amount of welding or casting work is required after high-altitude hoisting, which is faster and more convenient to construct than the general beam-type and thick plate-type conversion structures;

[0062] The support conversion structure of the heavy-load equipment on the top of the heat absorption tower of the present invention is economical and practical in the field of tower-type solar thermal power station engineering at home and abroad. The design method of its stiffness and bearing capacity can also be applied to the conversion structure of other high-rise structures, and has broad application prospects.

[0063] Embodiment 3:

[0064] A method for using a support conversion structure for heavy-load equipment on the top of a heat absorbing tower, wherein multiple spatial steel trusses 1 are arranged according to the arrangement of support steel columns 15 of an upper heat absorber, wherein an upper chord beam 5 is positioned consistently with the support steel column 15, a web member 7 is provided below a rigid support node 2 at a column foot, the upper chord beam 5 is cantilevered through a tower wall beam socket 13, and edge beams are used to connect and surround the cantilevered sections in sequence, an end of a lower chord beam 6 is connected to the top surface of a tower wall corbel 14, and a top plate 11 is placed above the upper chord beam 5.

[0065] The specific design principle of the method of using the present invention is: the upper chord beam 5 is positioned to correspond to the upper equipment support steel column 15 as much as possible, so as to realize the column foot rigid support node 2. In order to improve the seismic performance and deformation capacity of the node, a web member 7 (oblique or vertical web member) must be set under the column foot rigid support node 2; because the upper chord beam 5 is the direct bearing member of the heat absorber support steel column 15, the cross-sectional stiffness of the upper chord beam 5 is 1.5 to 2.0 times the cross-sectional stiffness of the lower chord beam 6, the upper chord beam 5 is cantilevered for a distance through the tower wall beam socket 13, and the cantilevered sections are connected in sequence by edge beams. The advantages of this method are that the upper part of the space steel truss is connected to the tower wall in an integral and firm manner, and the use space of the tower top is expanded by means of the steel truss inside the tower, saving construction costs. The top plate 11 is a concrete plate directly placed on the upper chord beam 5. The thickness and reinforcement are determined according to the structural requirements, which plays a protective role such as shielding rain and snow. To further strengthen the integrity and firmness of the connection between the steel truss and the tower wall, the end of the lower chord beam 6 of the steel truss is supported on the top surface of the tower wall bracket. According to the force requirements, the cross-sectional stiffness of the end oblique web member should be about 1.5 times that of the middle web. The method of using the tower top conversion structure provides a layout method to ensure the rigidity of the space steel truss structure and a connection method to ensure the bearing capacity of the conversion structure and the tower wall. Combined with the actual application of the project, the steel truss conversion structure of the present invention has good applicability and reliability.

[0066] In the description of the present invention, it is necessary to understand that if there are terms such as "left", "inside", "right", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and cannot be understood as limitations on the present invention.

[0067] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A support conversion structure for a heavy-load device on the top of a heat absorbing tower, wherein the heavy-load device is installed on the top of the heat absorbing tower through the support conversion structure, the heavy-load device comprises a heat absorber and a support steel column (15), and the heat absorber is installed on the support conversion structure through the support steel column (15), characterized in that: The support conversion structure installation comprises a spatial steel truss (1) and a top plate (11), the spatial steel truss (1) comprises an upper chord beam (5) and a lower chord beam (6), the upper chord beam (5) is connected to the lower chord beam (6) at the bottom, a tower wall beam socket (13) is provided at the top of the heat absorption tower wall (16), and a tower wall bracket (14) is provided at the inner wall of the heat absorption tower wall (16). The number of spatial steel trusses (1) is multiple, the upper chord beams (5) of the multiple spatial steel trusses (1) are connected to the top of the heat absorption tower through the tower wall beam socket (13), the top surface of the upper chord beam (5) is connected to the top plate (11), and the multiple spatial steel trusses (1) are connected to the top of the heat absorption tower through the tower wall beam socket (13). The lower chord beam (6) is connected to the top surface of the tower wall corbel (14); the spatial steel truss (1) further comprises a plurality of upper chord beam outer arms (8) and upper chord connecting beams (3), each upper chord beam outer arm (8) is cross-connected with the upper chord beam (5), and the upper chord beam outer arms (8) of two adjacent spatial steel trusses (1) are connected via the upper chord connecting beam (3); the spatial steel truss (1) further comprises a plurality of column foot rigid support nodes (2), and the intersection area of ​​the upper chord beam (5) and the upper chord beam outer arm (8) is connected to a column foot rigid support node (2); the upper chord beam (5) and the upper chord beam outer arm (8) are both wide Flange H-shaped steel, the wide flange H-shaped steel comprises an upper flange, a lower flange and a vertical connecting plate, the upper flange and the lower flange are arranged in parallel, and the middle parts of the upper flange and the lower flange are connected by a vertical connecting plate; the column foot rigid support node (2) comprises a horizontal reinforcing rib plate (9) and a vertical reinforcing rib plate (10), the inner side of the upper flange and the inner side of the lower flange in the intersection area of ​​the upper chord beam (5) and the upper chord beam outer arm (8) are horizontally connected to the horizontal reinforcing rib plate (9), and the upper flange and the lower flange in the intersection area of ​​the upper chord beam (5) and the upper chord beam outer arm (8) are vertically connected to the vertical reinforcing rib plate (10); the vertical reinforcing rib plate (10) The number of the plurality of vertical reinforcing ribs (10) is multiple, and the plurality of vertical reinforcing ribs (10) are arranged in a triangular or polygonal manner; the column foot rigid support node (2) further comprises a column foot bolt (12), and the column foot bolt (12) passes through the top plate (11), the horizontal reinforcing rib (9) below the upper flange, and the horizontal reinforcing rib (9) above the lower flange in order from top to bottom; the number of the column foot bolts (12) is multiple, and the plurality of column foot bolts (12) are evenly and symmetrically distributed on the column foot rigid support node (2); and the column foot rigid support node (2) further comprises an edge sealing beam, and the upper chord beams (5) of the plurality of spatial steel trusses (1) outside the tower wall beam socket (13) are connected via the edge sealing beam.

2. The support conversion structure for the heavy-load equipment on the top of the heat absorption tower according to claim 1, characterized in that: The spatial steel truss (1) further comprises a horizontal support (4), and the lower chord beams (6) of the plurality of spatial steel trusses (1) are connected via the horizontal support (4).

3. The support conversion structure for the heavy-load equipment on the top of the heat absorption tower according to claim 2, characterized in that: The spatial steel truss (1) further comprises a plurality of web members (7), and the upper chord beam (5) is connected to the lower chord beam (6) via the plurality of web members (7), wherein a web member (7) is provided below each column foot rigid support node (2).

4. The support conversion structure for the heavy-load equipment on the top of the heat absorption tower according to claim 3, characterized in that: The lower chord beam (6), the web member (7) and the upper chord connecting beam (3) all adopt wide flange H-shaped steel, the wide flange H-shaped steel comprises an upper flange, a lower flange and a vertical connecting plate, the upper flange and the lower flange are arranged in parallel, and the middle parts of the upper flange and the lower flange are connected by the vertical connecting plate.

5. The support conversion structure for the heavy-load equipment on the top of the heat absorption tower according to claim 4, characterized in that: The tower wall beam socket (13) is a rectangular lower recess.

6. The support conversion structure for heavy-load equipment on the top of a heat absorbing tower according to claim 1, characterized in that: The multiple spatial steel trusses (1) are arranged according to the arrangement of the support steel columns (15), and the upper chord beam (5) and the support steel columns (15) are positioned in the same manner.

7. A method for using the support conversion structure of the heavy-load equipment on the top of a heat absorbing tower according to any one of claims 1 to 6, characterized in that: The invention comprises the following steps: a plurality of spatial steel trusses (1) are arranged according to the arrangement of the support steel columns (15) in the heavy-load equipment on the top of the heat absorption tower, wherein the upper chord beam (5) and the support steel column (15) are positioned in the same manner, the lower part of the upper chord beam (5) is connected to the upper part of the lower chord beam (6) through a web bar (7), the upper chord beam (5) is cantilevered through a tower wall beam socket (13), the cantilevered sections are connected and surrounded in sequence by edge sealing beams, the end of the lower chord beam (6) is connected to the top surface of the tower wall corbel (14), and the top plate (11) is placed on the upper chord beam (5).

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