Converter station valve hall roof grid and its assembly method

Abstract

The application discloses a converter station valve hall roof net rack and an assembling method thereof, and relates to the technical field of building engineering and space steel structure. The converter station valve hall roof net rack comprises a net rack main body, a plurality of net rack assembling units and a unit connecting structure. The net rack main body is formed by combining the plurality of net rack assembling units along the length direction and the width direction of the valve hall roof. The net rack assembling unit comprises small assembling units pre-assembled by node balls and rod assemblies, and middle assembling units formed by combining the small assembling units. The plurality of middle assembling units are connected by the unit connecting structure to form the net rack main body. The unit connecting structure comprises a positioning structure and an adjusting assembly. The positioning structure is used for limiting the horizontal position of adjacent middle assembling units, and the adjusting assembly is used for compensating the installation deviation between the adjacent middle assembling units. The application can reduce the on-site assembling workload of scattered parts and repeated adjustment, improve the net rack assembling efficiency, the installation precision and the overall forming quality.

Description

Technical Field

[0001] This invention belongs to the field of building engineering and spatial steel structure technology, and more specifically it relates to a converter station valve hall roof grid and its assembly method. Background Technology

[0002] Converter stations are an important component of high-voltage direct current (HVDC) transmission systems. Valve halls, as the main installation and operation sites for converter equipment, typically require a large internal space to meet the requirements for equipment layout, operation, and maintenance. Due to the large span of the valve hall roof and the need to meet corresponding load-bearing capacity and structural stability requirements, its roof usually adopts a spatial grid structure formed by connections of nodes and members.

[0003] The valve hall roof space frame of a converter station typically comprises multiple nodes and members distributed along different spatial directions. During construction, the assembly, connection, and installation of each component must be completed according to design requirements. Due to the large span, numerous components, and complex spatial relationships between the nodes, the construction process demands strict control over the component installation sequence, node spatial positions, and overall dimensions of the space frame.

[0004] During the fabrication, transportation, and on-site installation of space frame components, deviations may occur in component dimensions, node positions, and connection status. As the construction scope gradually expands, these deviations may accumulate during the continuous assembly of the space frame, causing discrepancies between the connection positions of local components and their designed positions, increasing the difficulty of subsequent component installation and overall dimensional adjustments. Especially at the junctions of different construction areas, multiple measurements and on-site adjustments are usually required, and construction efficiency and installation accuracy are easily affected by site conditions and the operating experience of the workers.

[0005] Furthermore, before a complete load-bearing system is formed, the spatial stability of some nodes and members in large-scale space structures is relatively poor, requiring auxiliary support measures to maintain their installation status during construction. Existing construction methods often require numerous temporary adjustments when facing different spans, node locations, and site conditions, resulting in complex construction organization and significant difficulty in controlling the overall elevation, spatial dimensions, and installation status of the space structure.

[0006] Therefore, there is still room for improvement in the existing converter station valve hall roof grid structure and its construction method in terms of construction efficiency, spatial position control during installation, and error control during continuous assembly. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a converter station valve hall roof space frame and its assembly method, thereby improving the component assembly and regional connection effects during the construction of large valve hall roof space frames, reducing the impact of component manufacturing deviations and on-site installation deviations on the continuous assembly of the space frame, facilitating the control of the spatial position and overall dimensions of the space frame nodes, thereby reducing the amount of repeated on-site adjustments, and improving the assembly efficiency and overall installation quality of the space frame.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A converter station valve hall roof grid structure includes:

[0010] The main body of the space frame, multiple space frame assembly units, and unit connection structures for connecting adjacent space frame assembly units;

[0011] The main body of the grid structure is formed by combining and connecting multiple grid assembly units along the length and width directions of the converter station valve hall roof.

[0012] The space frame assembly unit includes small assembly units and medium assembly units. The small assembly unit is pre-assembled from multiple node spheres and rod components connecting adjacent node spheres. The medium assembly unit is formed by combining multiple small assembly units. The multiple medium assembly units are connected by the unit connection structure to form the space frame body.

[0013] The unit connection structure includes a positioning structure disposed at the connection position of adjacent middle unit, and an adjustment component disposed at the positioning structure for compensating for installation deviations between adjacent middle units.

[0014] The present invention is further configured such that the small unit comprises:

[0015] Multiple node balls;

[0016] A rod assembly, connecting adjacent node balls;

[0017] A node connection assembly for connecting the node ball to the rod assembly;

[0018] The rod assembly includes an upper chord arranged along the top of the main body of the space frame, a lower chord arranged along the bottom of the main body of the space frame, and a web member connecting the upper chord node ball and the lower chord node ball.

[0019] The upper chord, the lower chord, the web members, and the node spheres together form a spatial grid structure.

[0020] The present invention is further configured such that: the main body of the space frame is an upright quadrangular pyramidal space frame structure;

[0021] The node ball includes a bolt ball node, which has multiple threaded connection holes arranged circumferentially, and the multiple threaded connection holes are respectively corresponding to the spatial connection directions of the upper chord, the lower chord and the web member;

[0022] The end of the rod assembly is provided with a cone or sealing plate, which is connected to the threaded connection hole by a high-strength bolt.

[0023] The present invention is further configured such that: the space frame assembly unit is correspondingly provided with a support frame for assembly positioning; the support frame includes:

[0024] Support frame; node support, disposed on the support frame and used to support the corresponding node ball;

[0025] A height adjustment component is disposed between the node support and the support frame;

[0026] The height adjustment component is used to adjust the support height of the node support relative to the support frame according to the design elevation of the node ball and the arching height of the main body of the grid.

[0027] The present invention is further configured to include a temporary support structure for locally supporting the node spheres of the middle assembly unit;

[0028] The temporary support structure includes:

[0029] A support node is used to abut against the node ball to provide temporary support for the node ball;

[0030] A support member is connected between the support node and the foundation support position to maintain the spatial stability of the support node;

[0031] A height adjustment component is provided at the support node to adjust the support height of the support node so that the node ball maintains a preset spatial position.

[0032] The present invention is further configured such that the positioning structure includes:

[0033] The positioning protrusion is located at the edge connection position of one of the two adjacent middle splicing units;

[0034] A positioning recess is provided at the edge connection position of another of the two adjacent middle splicing units and cooperates with the positioning protrusion; the inner wall of the positioning recess is provided with a guide surface, which is used to guide the positioning protrusion to move to a preset cooperation position during the process of the positioning protrusion being inserted into the positioning recess;

[0035] An adjustment component is disposed between the positioning protrusion and the positioning recess;

[0036] After the positioning protrusion is inserted into the positioning recess, it restricts the horizontal position of two adjacent space frame assembly units.

[0037] The present invention is further configured such that the adjustment component includes:

[0038] An elastic compensation component is disposed on the outer wall of the positioning protrusion, and is used to generate elastic deformation during the process of the positioning protrusion being inserted into the positioning recess, so as to absorb the local positional deviation between adjacent middle splicing units.

[0039] An adjusting shim is disposed between the positioning protrusion and the positioning recess to adjust the fitting clearance between the positioning protrusion and the positioning recess, thereby adjusting the connection clearance between adjacent middle assembly units.

[0040] The present invention is further configured such that: the unit connection structure further includes a locking component, the locking component comprising:

[0041] A connecting plate is connected across the edge connection position of two adjacent middle splicing units, and the connecting plate is provided with a connecting hole;

[0042] Mounting holes are respectively provided on two adjacent space frame assembly units;

[0043] A locking bolt is inserted into the mounting hole and the connecting plate; and an anti-loosening structure is provided on the locking bolt.

[0044] The present invention is further configured such that: the space frame assembly unit further includes a node positioning mark structure disposed on the outer surface of the node sphere, the node positioning mark structure comprising:

[0045] The numbering and identification section is used to identify the installation position of the node ball in the main body of the space frame; and

[0046] The direction marking section is used to indicate the spatial installation direction of the node ball.

[0047] A method for assembling the roof grid structure of a converter station valve hall, characterized by comprising the following steps:

[0048] S1. Space frame unit division: Based on the overall dimensions and structural span of the converter station valve hall roof, the space frame to be installed is divided into multiple space frame assembly areas, and each space frame assembly area is further divided into small assembly units and medium assembly units; the small assembly units serve as basic spatial structure units, and the medium assembly units are formed by combining multiple small assembly units;

[0049] S2. Small unit assembly: In the ground assembly area, the node balls are connected to the rod components, so that the upper chord, lower chord, and web members form a spatial grid structure with the corresponding node balls, and the prefabrication and assembly of multiple small units are completed.

[0050] S3. Formation of intermediate units: Multiple intermediate units are arranged sequentially in the valve hall roof installation area; using the positioning structure set between adjacent intermediate units, the connection positions of adjacent intermediate units maintain a preset spatial relationship;

[0051] S4. Positioning and installation of intermediate assembly units: Arrange multiple intermediate assembly units sequentially in the valve hall roof installation area; utilize the positioning structure set between adjacent intermediate assembly units to maintain a preset spatial relationship in the connection position of adjacent intermediate assembly units;

[0052] S5. Assembly Error Adjustment: When there is an installation deviation between adjacent middle assembly units...

[0053] The positions between the middle assembly units are compensated and adjusted by adjusting the components; positional offsets caused by manufacturing errors are absorbed by elastic compensation components; and the gap size between adjacent middle assembly units is adjusted by adjusting shims.

[0054] S6. Overall Connection: The adjacent intermediate splicing units are fixedly connected by locking components; the node positions, overall elevation and spatial dimensions of the main body of the grid are detected and adjusted; and the assembly of the converter station valve hall roof grid is completed.

[0055] In summary, the present invention has at least the following advantages:

[0056] 1. By setting up a hierarchical modular assembly structure in which multiple small assembly units are combined to form medium assembly units, and further connected to form the main body of the grid structure, the grid structure of the converter station valve hall roof can be transformed from the traditional on-site assembly of scattered parts to a modular prefabrication assembly method. During construction, the assembly of small and medium assembly units can be completed in advance, reducing the workload of installing each member on-site, reducing the difficulty of constructing large space grid structures, improving the efficiency of grid assembly and the standardization of the construction process;

[0057] 2. By setting up a unit connection structure including positioning protrusions, positioning recesses, and adjustment components, adjacent space frame assembly units can achieve rapid guidance and initial positioning during the connection process through the cooperation of positioning protrusions and positioning recesses. Elastic compensation components are used to absorb positional offsets caused by manufacturing errors. At the same time, the connection gap between adjacent space frame assembly units is finely adjusted by adjusting shims, thereby reducing the cumulative error generated during the assembly of space frame modules, improving the connection accuracy between multiple space frame assembly units and the overall installation quality.

[0058] 3. By setting up a locking assembly including connecting plates, mounting holes, locking bolts, and anti-loosening structures, adjacent space frame assembly units can achieve stable connection through mechanical locking after positioning and adjustment. This avoids the problem of insufficient connection reliability caused by relying solely on the positioning structure. At the same time, the anti-loosening structure reduces the risk of bolt loosening caused by roof load changes, environmental vibrations, and other factors during long-term service, thereby improving the stability and reliability of the connection position of the space frame main body.

[0059] 4. By setting up support jigs for supporting the space frame assembly units and temporary support structures for temporarily supporting the node balls, the space frame can obtain stable support during the prefabrication and assembly and the gradual connection to form an overall structure. The height adjustment components and height adjustment parts are used to adjust the support height according to the installation position of the node balls and the arching height of the space frame, so that the node balls maintain the preset spatial position, reduce node offset caused by construction environment, component size deviation and installation error, and improve the spatial positioning accuracy and overall forming quality of the space frame assembly process.

[0060] 5. By setting up node positioning marking structures on the outer surface of the node sphere, and using numbering markings to mark the node installation position and direction markings to mark the node installation direction, construction personnel can quickly identify the positional relationship and connection direction of the corresponding nodes when assembling small, medium, and space frame assembly units. This reduces installation errors caused by a large number of nodes and complex spatial connection relationships, and improves the identification efficiency and assembly accuracy during the modular construction of the space frame. Attached Figure Description

[0061] Figure 1 This is a schematic diagram of the combination of the node ball, the rod assembly, and the node connection assembly in a specific embodiment of the present invention;

[0062] Figure 2 This is one of the steps in the splicing of the valve hall roof grid in a specific embodiment of the present invention;

[0063] Figure 3 This is the second step in the splicing process of the valve hall roof grid frame in a specific embodiment of the present invention;

[0064] Figure 4 This is the third step in the assembly process of the valve hall roof grid frame in a specific embodiment of the present invention;

[0065] Figure 5 This is the fourth step in the assembly process of the valve hall roof grid frame in a specific embodiment of the present invention;

[0066] Figure 6 This is a partial overall schematic diagram of the positioning structure and locking assembly in a specific embodiment of the present invention;

[0067] Figure 7This is a cross-sectional schematic diagram of the positioning structure in a specific embodiment of the present invention;

[0068] Figure 8 This is one of the splicing steps of the high-end valve hall roof grid structure in a specific embodiment of the present invention;

[0069] Figure 9 This is the second diagram showing the splicing steps of the high-end valve hall roof grid in a specific embodiment of the present invention;

[0070] Figure 10 This is the third diagram showing the splicing steps of the high-end valve hall roof grid in a specific embodiment of the present invention;

[0071] Figure 11 This is the fourth diagram showing the splicing steps of the high-end valve hall roof grid in a specific embodiment of the present invention;

[0072] Figure 12 This is one of the splicing steps of the low-end valve hall roof grid structure in a specific embodiment of the present invention;

[0073] Figure 13 This is the second diagram showing the splicing steps of the low-end valve hall roof grid in a specific embodiment of the present invention;

[0074] Figure 14 This is the third diagram showing the splicing steps of the low-end valve hall roof grid in a specific embodiment of the present invention.

[0075] Reference numerals: 110, node ball; 111, bolt ball node; 112, threaded connection hole; 120, rod assembly; 121, upper chord; 122, lower chord; 123, web member; 124, cone head; 125, high-strength bolt; 130, node connection assembly; 200, positioning structure; 210, positioning protrusion; 211, positioning recess; 212, adjusting assembly; 2121, elastic compensation element; 2122, adjusting shim; 300, locking assembly; 310, connecting plate; 320, mounting hole; 330, locking bolt; 400, temporary support structure. Detailed Implementation

[0076] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other.

[0077] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0078] Example 1

[0079] like Figures 1-7 As shown, a converter station valve hall roof grid includes a grid body, multiple grid assembly units, and a unit connection structure for connecting adjacent grid assembly units.

[0080] The main body of the space frame serves as the spatial load-bearing structure for the valve hall roof of the converter station, and is formed by combining and connecting multiple space frame assembly units along the length and width directions of the valve hall roof. Each space frame assembly unit includes small assembly units and medium assembly units. Small assembly units are the basic spatial structural units, while medium assembly units are formed by combining multiple small assembly units according to a preset arrangement. These medium assembly units are connected by a unit connection structure to form the main body of the space frame.

[0081] In this embodiment, the main body of the space frame is preferably an upright quadrangular pyramidal space frame structure. This structure is formed by the continuous combination of multiple spatial pyramidal units, and a spatial force-bearing system is constituted through the coordinated connection between the upper chord 121, lower chord 122, and web members 123. The nodes in the main body of the space frame preferably include bolted ball joints 111a, and welded ball joints can be installed at the support locations according to engineering design requirements to meet the connection requirements between the main body of the space frame and the lower supporting structure.

[0082] The grid structure components in this embodiment can be manufactured in a factory. Components such as node balls 110, rod assemblies 120, cone heads 124, sealing plates, hexagonal sleeves, and high-strength bolts can be processed, inspected, treated with anti-corrosion measures, and supplied as complete sets at the processing site according to the design drawings and component numbers. After the components are transported to the construction site, they are assembled step by step in the designated ground assembly area, consisting of small assembly units, medium assembly units, and the main body of the grid structure.

[0083] Specifically, based on the building axis, structural span, construction site, and installation sequence of the converter station valve hall roof, the main structure of the space frame to be installed can be divided into multiple assembly areas, and the scope of small and medium-sized assembly units can be determined within each assembly area. For valve hall roofs with large spans, the division can be based on axis sections, installation segments, or construction flow sections, and the assembly can proceed step by step in the order of the middle section first, then the sides, or the main span first, then the side spans. The above division method is used to illustrate the hierarchical assembly approach; the actual division scope can be adjusted according to the engineering drawings and on-site installation conditions.

[0084] like Figure 1 As shown, Figure 1The central view is a spatial node diagram of the node ball 110 connected to the multiple rod assemblies 120, illustrating the connection of the multiple rod assemblies 120 around the same node ball 110 in different spatial directions; the left side of the central view is a structural schematic diagram of the node ball 110, showing the threaded connection hole 111 and connection hole position 112 provided on the node ball 110; the upper left corner view of the central view is an exploded view of the node connection assembly, showing the connection between the high-strength bolt 124, the sleeve 130, and the cone head 125. Assembly Relationships: The lower left sectional view of the middle view is an axial sectional schematic diagram of the connection between the rod assembly 120 and the node ball 110, illustrating the threaded connection of the high-strength bolt 124 along the axial direction of the rod assembly 120 to the threaded connection hole 111 on the node ball 110; the upper right corner view of the middle view is a partially enlarged schematic diagram of the connection between the node ball 110 and the rod assembly 120, illustrating the connection between the end of the rod assembly 120 and the node ball 110 via the cone head 125, sleeve 130, and high-strength bolt 124; the lower right corner view of the middle view is a schematic diagram of the planar arrangement of multiple rod assemblies 120 around the node ball 110, illustrating the different connection orientations of the multiple rod assemblies 120 relative to the node ball 110.

[0085] The small modular unit is pre-assembled from multiple node spheres 110 and rod assemblies 120 connecting adjacent node spheres 110. The small modular unit can adopt a four-corner pyramid structure with one sphere and four rods, or a three-corner triangular pyramid structure with one sphere and three rods, depending on local structural needs, or other basic spatial structures formed by node spheres 110 and several rod assemblies 120. The division of the small modular units should correspond to the structural form and rod arrangement relationship of the main structure of the space frame.

[0086] The intermediate assembly unit is formed by combining multiple qualified smaller assembly units along the length and width directions. Each intermediate assembly unit can correspond to an axis segment, an installation section, or a local installation area. By setting up smaller and intermediate assembly units, a large proportion of the structural assembly of the valve hall roof truss of a large converter station can be completed within the ground assembly area, reducing the measurement and adjustment workload during high-altitude pole-by-pole installation.

[0087] The unit connection structure is located at the connection position of adjacent space frame assembly units and includes a positioning structure 200 and a locking assembly 300. The positioning structure 200 is used to guide and position the connection edge of adjacent space frame assembly units and adaptively compensate for processing errors, assembly errors, or installation errors. The locking assembly 300 is used to fix the adjacent space frame assembly units together after positioning and error adjustment are completed. Thus, the unit connection structure forms a connection relationship in which positioning, adjustment, and locking are sequentially coordinated.

[0088] During the ground assembly of the space frame, a support jig can be set up. The support jig is an array of temporary support fixtures arranged in the ground assembly area, used to provide overall support and camber control for multiple node spheres 110. The support jig includes a support frame body, node support parts, and height adjustment components. The node support parts are set on the support frame body, and the height adjustment components are set between the node support parts and the support frame body to adjust the support height of the node support parts.

[0089] When adjacent intermediate units are in place, connected, or partially linked but have not yet formed a stable force relationship, temporary support structures can be set up. These temporary support structures are independently deployable local support devices, mainly used for temporary support and local elevation adjustment of single or a small number of node balls 110 at the connection edge. The temporary support structure 400 includes support nodes, support rods, and a height adjustment assembly. The support nodes abut against the node balls 110, the support rods connect the support nodes to the foundation support position, and the height adjustment assembly adjusts the support height of the support nodes.

[0090] The supporting jig and the temporary support structure 400 have different stages of use and scope of application. The supporting jig is mainly used for overall ground support of small and medium-sized assembly units, while the temporary support structure 400 is mainly used for local node support and elevation correction after the medium-sized assembly units are in place. The two can be used separately or in combination depending on the assembly stage.

[0091] To facilitate component identification and installation, a node positioning mark structure can also be provided on the outer surface of the node ball 110. The node positioning mark structure includes a numbering mark and a direction mark. The numbering mark is used to identify the installation position of the node ball 110, and the direction mark is used to identify the preset installation direction of the node ball 110.

[0092] Example 2

[0093] like Figure 1 , Figure 2 As shown, both the small and medium-sized assembly units include multiple node spheres 110, rod assemblies 120, and node connection assemblies 130. The rod assemblies 120 are connected between adjacent node spheres 110, and the node connection assemblies 130 are used to connect the rod assemblies 120 to the node spheres 110, so that the node spheres 110 and the rod assemblies 120 together form a preset spatial rod structure.

[0094] The member assembly 120 includes an upper chord 121, a lower chord 122, and a web member 123. Multiple upper chord members 121 are connected to corresponding upper chord node balls 110 to form an upper chord layer, and multiple lower chord members 122 are connected to corresponding lower chord node balls 110 to form a lower chord layer. The web member 123 is obliquely connected between the upper chord node balls 110 and the lower chord node balls 110 to establish a spatial connection between the upper and lower chord layers.

[0095] In the upright quadrangular pyramidal space frame structure, one end of multiple web members 123 is connected to the corresponding lower chord node ball 110, and the other end is connected to the same upper chord node ball 110, thus forming a downward-facing quadrangular pyramidal unit; adjacent quadrangular pyramidal units are continuously connected through upper chord members 121 and lower chord members 122 to form the main body of the space frame.

[0096] like Figure 1 As shown, the node ball 110 includes a bolt ball node 111. The bolt ball node 111 is provided with a plurality of threaded connection holes 112 along the circumference. Each threaded connection hole 112 is arranged according to the spatial connection direction of the rod assembly 120 in the construction drawings, so that the upper chord 121, lower chord 122 and web member 123 in different directions can be connected to the corresponding threaded connection hole 112 respectively.

[0097] The rod assembly 120 can be a steel pipe rod, and the end of the steel pipe rod is provided with a cone head 124 or a sealing plate according to the rod specifications and connection method. The cone head 124 or sealing plate is connected to the corresponding threaded connection hole 112 on the bolt ball joint 111a by a high-strength bolt.

[0098] The node connection assembly 130 may include a hexagonal sleeve. The hexagonal sleeve is disposed at the connection position between the high-strength bolt and the end of the rod assembly 120, and its outer periphery forms a hexagonal operating surface for wrench clamping, so that the construction personnel can tighten the high-strength bolt through the hexagonal sleeve to complete the connection and fastening between the rod assembly 120 and the bolt ball joint 111a.

[0099] Before assembling the small assembly units, a complete inspection can be performed on the bolt ball joint 111a, member assembly 120, cone head 124, sealing plate, hexagonal sleeve, and high-strength bolts. The inspection includes checking the ball joint number 110, member specifications, member length, location of threaded connection hole 112, member end connection status, high-strength bolt condition, and anti-corrosion coating condition. Components that do not meet the design or assembly requirements after inspection should be treated or replaced before participating in the assembly.

[0100] The small assembly units are preferably assembled on a support frame. During assembly, the lower chord node ball 110 is first placed on the corresponding node support, and the elevation and axial position of the lower chord node ball 110 are adjusted by the height adjustment component; then, the lower chord rod 122 is connected between adjacent lower chord node balls 110, so that the lower chord structure forms the positioning foundation of the small assembly unit.

[0101] After assembling the lower chord structure, place the upper chord node ball 110 in the preset position and install the web members 123. When installing the web members 123, the relative positions between the upper chord node ball 110 and the lower chord node ball 110 should be corrected so that multiple web members 123 are connected between the upper chord node ball 110 and the lower chord node ball 110 according to the design angle. Appropriate adjustment allowance can be reserved at the connection points of the web members 123, while ensuring reliable connection, to facilitate local correction during the subsequent installation of the upper chord ball 121.

[0102] The upper chord 121 is then installed. The upper chord 121 is preferably installed gradually from the inside out, unfolding sequentially according to the already formed conical units. After the upper chord 121 is connected to the corresponding upper chord node ball 110, the node elevation, cone height, and spatial dimensions can be verified using the support frame. Once the local spatial structure meets the design requirements, the final tightening of the relevant high-strength bolts is completed sequentially.

[0103] By first forming the lower chord positioning foundation, then using the web member 123 to establish the spatial relationship between the upper chord node ball 110 and the lower chord node ball 110, and finally closing the upper chord layer through the upper chord member 121, an assembly path that gradually expands from bottom to top and from inside to outside can be formed, thereby reducing the cumulative transmission of geometric errors in small assembly units to medium assembly units.

[0104] After the small assembly unit is completed, its upper chord length, cone height, upper chord diagonal, center distance between upper and lower chord nodes, node elevation, and the tightness of high-strength bolts are inspected. After passing the inspection, multiple small assembly units are combined according to a preset arrangement to form a medium assembly unit.

[0105] In some preferred embodiments, for the welded ball joint in the support area, or in cases where it is necessary to weld the cylindrical member to the ball joint 110 to form the ball joint 110-member assembly 120, a welding positioning fixture can be used to pre-position the ball joint 110 and the member assembly 120.

[0106] The welding positioning fixture includes a base, a ball clamping mechanism, a clamping mechanism, and a rod positioning mechanism. The ball clamping mechanism, mounted on the base, includes at least two clamping blocks for clamping the node ball 110, a clamping drive assembly for driving the clamping blocks, and a support block for supporting the node ball 110. The clamping mechanism, located above the ball clamping mechanism, includes a top block and a clamping drive assembly for driving the top block to move vertically. The top block abuts against the node ball 110 from above. The clamping blocks, support block, and top block together define the position of the node ball 110, forming a spatial positioning reference with the center of the node ball 110 fixed relative to the base.

[0107] The rod positioning mechanism is mounted on the base and uses the spatial positioning reference as the positioning center to guide the rod assembly 120 to move to the welding position, so that the central axis of the rod assembly 120 passes through the spatial positioning reference.

[0108] Preferably, there are two clamping blocks arranged symmetrically relative to the supporting block. The supporting block is provided with a support portion for supporting the bottom of the node ball 110, and the support portion is provided with a first arc surface. The clamping block is provided with a side wall support portion, and the side wall support portion is provided with a second arc surface. The top block is provided with a third arc surface at one end facing the node ball 110. The first arc surface, the second arc surface and the third arc surface are respectively adapted to the outer surface of the node ball 110.

[0109] Preferably, the clamping drive assembly includes a bidirectional lead screw mechanism, which includes a bidirectional lead screw with opposite threads at both ends and a sliding rod. The two ends of the bidirectional lead screw are respectively threaded to two clamping blocks. The sliding rod is fixedly mounted on the base, and the clamping blocks are slidably sleeved on the sliding rod and slidably connected to the base.

[0110] Preferably, the rod positioning mechanism includes a bracket mounted on a base, with at least one aiming sleeve on the bracket, the axis of which passes through the spatial positioning reference. The bracket includes an arc-shaped guide rail centered on the spatial positioning reference, with a slider slidably mounted on the arc-shaped guide rail. The aiming sleeve is detachably mounted on the slider, and the slider can move along the arc-shaped guide rail and be locked at a preset angle position. Preferably, at least two sliders are mounted on the arc-shaped guide rail, each slider having an aiming sleeve mounted on it. The multiple aiming sleeves correspond to different welding positions of multiple rod components 120 to be welded on the node ball 110. The surface of the arc-shaped guide rail has angle scale lines along its circumference, and the slider has an indicator needle matching the angle scale lines and a fixing member for fixing the slider. Preferably, the top of the clamping block also has a U-shaped groove for placing the rod component 120; the outer surface of the welding positioning fixture can also be coated with an anti-corrosion coating.

[0111] Example 3

[0112] The support frame includes a support frame body, node support parts, and height adjustment components.

[0113] The support frame is used to form the main load-bearing structure of the support frame. The support frame includes multiple vertical support members and connectors connecting adjacent vertical support members. The vertical support members are used to bear the vertical loads transmitted by the node ball 110 and the space frame assembly unit during the ground assembly stage; the connectors are used to connect adjacent vertical support members to improve the overall stability of the support frame.

[0114] In this embodiment, the support frame can use steel pipe components as the main temporary support points. Multiple steel pipe components are arranged according to the planar projection positions of the node spheres 110 in the space frame assembly unit, ensuring that each node sphere 110 requiring support can be supported by the corresponding support frame. For locations with large spans or concentrated node loads, the number of support points can be appropriately increased or the overall rigidity of the support frame can be improved to ensure that the support frame does not undergo significant deformation affecting the accuracy of the node positions during space frame assembly.

[0115] Furthermore, diagonal tie members can be installed between adjacent vertical support members. The diagonal tie members are used to form diagonal constraints between adjacent vertical support members, reducing horizontal swaying or local instability of the support frame during the stress process.

[0116] The node support is mounted on the support frame and is used to support the node ball 110. Specifically, the node support is located at the upper end of the support frame or at the lower support position of the corresponding node ball 110. The node support can abut against the outer surface of the node ball 110, or it can indirectly abut against the node ball 110 through a pad, support plate, or other supporting structure. The position of the node support corresponds to the designed spatial position of the node ball 110 in the space frame assembly unit, so that the node ball 110 can maintain the preset elevation and preset plane position during the assembly process.

[0117] The height adjustment component is located between the node support and the support frame, and is used to adjust the support height of the node support according to the installation position of the node ball 110 and the arching height of the grid structure.

[0118] In practical implementation, the height adjustment component can be configured as an adjustable pad, adjusting screw, adjustable support, lifting component, or other adjustment structure capable of changing the height of the node support relative to the support frame. The specific form of the height adjustment component can be selected based on the construction site conditions, the weight of the node ball 110, the adjustment accuracy requirements, and the need for repeated use. Regardless of the form adopted, the height adjustment component should be able to adjust the support height of the node support during the assembly of the space frame assembly unit, so that the node ball 110 maintains the preset spatial position.

[0119] The main body of the space frame also includes a temporary support structure 400. The temporary support structure 400 is mainly used to provide temporary support, spatial stability, and height adjustment for the node balls 110 during the gradual assembly of the main body of the space frame, ensuring that the node balls 110 maintain a preset spatial position before the space frame assembly units are fully connected to form an overall load-bearing system. The temporary support structure 400 includes support nodes, support rods, and height adjustment components. The support nodes are used to abut against the node balls 110 of the space frame assembly units to provide temporary support for the node balls 110, ensuring stable support for the node balls 110 during assembly and preventing positional displacement of the space frame assembly units due to their own weight or external disturbances.

[0120] The support members connect the support nodes and the foundation support positions to maintain the spatial stability of the support nodes. By connecting the support nodes and the foundation support positions with the support members, the support nodes can form a stable spatial support system, thereby improving the load-bearing stability of the temporary support structure 400.

[0121] The height adjustment component is located at the support node and is used to adjust the support height of the support node. Through the height adjustment component, the support height of the support node can be adjusted according to the actual installation position during the space frame assembly process, thereby ensuring that the node ball 110 maintains a preset spatial position and guarantees the spatial dimensions and elevation requirements during the space frame assembly process.

[0122] During the gradual assembly of the main structure of the space frame, the temporary support structure 400 not only provides reliable temporary support and precision control for the node ball 110, but also reduces the risk of deformation caused by unstable stress during the installation stage of the large space frame, thereby improving the overall assembly quality and construction safety of the main structure of the space frame.

[0123] Example 4

[0124] like Figure 6 , Figure 7 As shown, the positioning structure 200 includes a positioning protrusion 210, a positioning recess 211, and an adjustment component 212. The positioning protrusion 210 is located at the edge connection position of one of the space frame assembly units, and the positioning recess 211 is located at the corresponding edge connection position of an adjacent space frame assembly unit and cooperates with the positioning protrusion 210. The adjustment component 212 is located at the cooperation position between the positioning protrusion 210 and the positioning recess 211.

[0125] The edge connection position of the space frame assembly unit can be the edge node area, edge member area, or reserved connection area of ​​the middle assembly unit. The positioning protrusion 210 and positioning recess 211 can be respectively set on the edge connection member of the adjacent middle assembly unit, or they can be set on the connecting seat, connecting plate 310, or transition connector that mates with the node ball 110 or member assembly 120.

[0126] As adjacent mid-assembly units gradually approach each other along the mating direction, the positioning protrusion 210 first aligns with the opening of the positioning recess 211, and then inserts into the positioning recess 211. After the outer wall of the positioning protrusion 210 and the inner wall of the positioning recess 211 form a fit, the relative displacement of the adjacent mid-assembly units in the horizontal direction is restricted.

[0127] When the connecting edge is long, multiple sets of positioning protrusions 210 and positioning recesses 211 can be provided at intervals along the edge of the space frame assembly unit. Preferably, at least one set of the multiple positioning structures 200 is used as a reference positioning position, and the remaining positioning structures 200 retain adjustment margins in non-reference directions to cooperate with the adjustment component 212, so as to reduce the possibility of interference between the multiple positioning structures 200 due to the cumulative error of the components.

[0128] The positioning protrusion 210 and the positioning recess 211 do not use a completely rigid fit with no margin. Since the space frame assembly unit may have positional deviations during processing, transportation, ground assembly and positioning, an adjustment component 212 is provided between the positioning protrusion 210 and the positioning recess 211 so that the positioning structure 200 can accommodate a certain range of manufacturing and installation errors while achieving horizontal limitation.

[0129] The adjustment assembly 212 includes an elastic compensation member 2121, a guide surface, and an adjustment shim 2122. The elastic compensation member 2121 is fixedly disposed on the outer wall of the positioning protrusion 210, the guide surface is disposed at the opening or inner wall of the positioning recess 211, and the adjustment shim 2122 is selectively disposed between the positioning protrusion 210 and the positioning recess 211.

[0130] The elastic compensation component 2121 can be an elastic pad or an elastic block with elastic deformation capability. After the positioning protrusion 210 is inserted into the positioning recess 211, the elastic compensation component 2121 is located between the positioning protrusion 210 and the positioning recess 211, and generates elastic deformation when squeezed by the inner wall of the positioning recess 211 to absorb local gap changes, so that the positioning protrusion 210 and the positioning recess 211 maintain a relatively stable contact state.

[0131] The guide surface is preferably an inclined surface or an arc-shaped transition surface provided at the opening of the positioning recess 211, so that the opening area of ​​the positioning recess 211 forms an introduction space that narrows from wide to narrow. When the positioning protrusion 210 enters the positioning recess 211, the guide surface guides the positioning protrusion 210 to move gradually towards the preset mating position, thereby allowing a certain lateral deviation between the positioning protrusion 210 and the positioning recess 211 in the initial state.

[0132] Adjusting shims 2122 are used to compensate for the dimensional gap between the positioning protrusion 210 and the positioning recess 211. Adjusting shims 2122 can be pre-positioned in the corresponding mating position before the positioning protrusion 210 is inserted, or they can be inserted through the opening side of the positioning recess 211 or through a pre-reserved operating gap after initial positioning is completed. Construction personnel can select the placement, quantity, or thickness of the adjusting shims 2122 based on measurement results.

[0133] The elastic compensating component 2121 and the adjusting shim 2122 have different functions. The elastic compensating component 2121 mainly absorbs local deviations through elastic deformation, while the adjusting shim 2122 mainly forms a relatively fixed gap compensation. The two work together to enable the positioning structure 200 to not only adapt to errors during the insertion process, but also correct the connection gap after positioning.

[0134] The locking assembly 300 includes a connecting plate 310, mounting holes 320 respectively provided on two adjacent space frame assembly units, locking bolts 330, and an anti-loosening structure. The connecting plate 310 is used to bridge the edge connection position of two adjacent space frame assembly units. The connecting plate 310 has holes corresponding to the mounting holes 320. The locking bolts 330 pass through the holes on the connecting plate 310 and the corresponding mounting holes 320 in sequence to fix the connecting plate 310 between the two adjacent space frame assembly units.

[0135] Mounting holes 320 can be provided on the edge connectors, connectors, or connecting lugs of the space frame assembly unit. Connecting plates 310 can be provided on the upper, lower, or lateral connection positions of adjacent middle assembly units, or they can be provided near the node ball 110 or the edge rod assembly 120 depending on the specific connection space.

[0136] After the positioning structure 200 completes horizontal positioning and the adjustment component 212 completes error compensation, the locking bolt 330 presses the connecting plate 310 against the connection position of the adjacent middle assembly unit, so that the adjusted relative position remains stable. The anti-loosening structure is set on the locking bolt 330, and can be an anti-loosening nut, double nut, elastic washer, or other anti-loosening structure that cooperates with the locking bolt 330.

[0137] In this embodiment, the locking assembly 300 is retained in the main body of the space frame as a fixed connection structure between adjacent intermediate units, thereby reducing the risk of loosening of the connection due to vibration, temperature changes, or load changes during subsequent construction and long-term use. The positioning structure 200 is mainly used for guidance and position control during the installation phase, while the locking assembly 300 is used to maintain the final connection state.

[0138] Example 5

[0139] The node positioning marking structure is set on the outer surface of the node sphere 110, including a numbering marking part and a direction marking part. The numbering marking part corresponds to the node number, sphere number or component list number in the construction drawings, and is used to determine the installation position of the node sphere 110 in the small assembly unit, medium assembly unit and the main body of the space frame.

[0140] The numbering and marking section can be set near the reference hole plane, the cut plane, or other positions that do not affect the machining and connection of the threaded connection hole 112 of the bolt ball joint 111, and can be a marking form that can remain identifiable during transportation and on-site assembly, such as steel stamping, spraying, engraving, or nameplate.

[0141] The directional marking section is used to indicate the spatial installation direction of the node ball 110, and can correspond to the length direction, width direction or preset reference direction of the main body of the space frame. The directional marking section can use arrows, engravings, color marks, directional letters or directional symbols, and should be set in a position that does not affect the stress on the node ball 110, the connection of the threaded connection hole 112, and the main protective effect of the anti-corrosion layer.

[0142] When assembling small modular units, construction workers first confirm the installation position of the node ball 110 according to the numbering label, and then adjust the spatial orientation of the node ball 110 according to the direction label to ensure that the threaded connection hole 112 accurately matches the corresponding rod assembly 120. When multiple small modular units are combined to form a medium modular unit, the numbering label and direction label can also be used to verify the relationship between adjacent edge node balls 110 and corresponding connecting components.

[0143] Example 6

[0144] like Figures 2-4 As shown, based on Embodiments 1 to 5, the present invention also provides a method for assembling the roof grid of a converter station valve hall, the method comprising the following steps:

[0145] S1, Space Frame Unit Division

[0146] Based on the overall dimensions and structural span of the converter station valve hall roof, the space frame to be installed is divided into multiple space frame assembly areas, and each space frame assembly area is further divided into small assembly units and medium assembly units; the small assembly units serve as basic spatial structural units, and the medium assembly units are formed by combining multiple small assembly units.

[0147] Specifically, in the process of dividing the space frame into units, the overall assembly area of ​​the main body of the space frame is first determined based on the building axis, span dimensions, space frame structure form, construction site conditions, lifting equipment layout, and installation sequence of the valve hall roof. For valve hall roofs with large spans, the overall space frame can be divided into multiple space frame assembly areas according to axis sections, lifting sections, or construction flow sections.

[0148] In this embodiment, the main body of the space frame preferably adopts an upright quadrangular pyramidal space frame structure. Therefore, the small assembly units can be quadrangular pyramidal units with one ball and four rods, or triangular pyramidal units with one ball and three rods, depending on the local structural needs. The division of small assembly units should comprehensively consider the type of space frame structure, the number of node balls 110, the arrangement of rod components 120, the construction plan, and the conditions of the assembly frame, so that the small assembly units are easy to assemble on the ground, measure dimensions, and combine in the future.

[0149] Multiple small modular units are combined according to the spatial arrangement in the construction drawings to form a medium-sized modular unit. The size of the medium-sized modular unit can be determined based on the on-site lifting capacity, transportation route, assembly site, and installation sequence. For areas that can be lifted as a whole, the medium-sized modular unit can be used as part of the segmented lifting structure; for areas that require high-altitude bulk assembly or interlocking connections, the medium-sized modular unit can also be used as an on-site installation module, connected to adjacent medium-sized modular units through a unit connection structure.

[0150] When dividing the structure into units, the numbering, orientation, component supply range, support frame layout, and unit connection structure of each node sphere 110 can be determined simultaneously. By pre-determining this information during the division phase, a clear basis can be provided for the subsequent assembly of small and medium-sized units, the formation of medium-sized units, and the overall assembly of the space frame.

[0151] S2, Small assembly unit assembly

[0152] A support frame is arranged in the ground assembly area so that the node support corresponds to the planar projection position of the node ball 110 to be supported, and the support height of each node support is adjusted by the height adjustment component.

[0153] Select the corresponding node ball 110 according to the numbering markings, and adjust the installation direction of the node ball 110 according to the direction markings. Place the lower chord node ball 110 on the node support, and after verifying the elevation, axis and center position of the lower chord node ball 110, connect the lower chord rod 122 between the adjacent lower chord node balls 110 to form the lower chord positioning foundation.

[0154] Then, the upper chord node ball 110 is set and the web members 123 are installed, so that multiple web members 123 are connected between the upper chord node ball 110 and the corresponding lower chord node ball 110 according to the design angle to form a cone unit; then the upper chord members 121 are installed from the inside to the outside, so that the upper chord layer is formed between adjacent upper chord node balls 110.

[0155] During the member connection process, the node elevation, cone height, upper chord diagonal, and center distance between the upper and lower chord nodes are checked. After the local spatial structure meets the design requirements, the high-strength bolts are finally tightened. After the dimensions and connection status are checked and approved, the small assembly unit is obtained.

[0156] For the node ball 110-rod assembly 120 that needs to be welded, the node ball 110 can be clamped and pressed tightly by the welding positioning fixture, so that the center of the node ball 110 forms a spatial positioning reference fixed relative to the base. Then, the rod assembly 120 is guided to the welding position by the aiming sleeve, so that the central axis of the rod assembly 120 passes through the spatial positioning reference, and then spot welding or formal welding is completed.

[0157] S3, Formation of the middle unit

[0158] Multiple qualified small assembly units are transferred to their corresponding assembly positions according to a preset arrangement. The edge node balls 110, rod components 120, and connecting components of adjacent small assembly units are checked to ensure that the node positions of adjacent small assembly units correspond, the rod connection directions are consistent, and the elevation of the upper and lower chord layers is continuous.

[0159] Adjacent small units are connected by node connection components 130 or interlocking rods, and the local node elevation and camber are adjusted under the support of the support frame to form a middle unit. After the middle unit is completed, the overall elevation, node position, spatial dimensions, rod connection status, and bolt tightness are inspected.

[0160] S4, Middle Unit Positioning and Installation

[0161] The qualified intermediate assembly units are directly hoisted or moved to the designed installation position on the valve hall roof using a lifting device, and initially positioned according to the installation axis and design elevation. For the node ball 110 with local elevation deviations at the connection edge, temporary support structure 400 is used for support and height adjustment.

[0162] The positioning protrusion 210 at the edge of one of the middle unit is aligned with the positioning recess 211 at the edge of the adjacent middle unit. As the middle units continue to move closer, the guide surface guides the positioning protrusion 210 to gradually insert into the positioning recess 211. The elastic compensation member 2121 undergoes elastic deformation during the insertion process to accommodate local positional deviations.

[0163] After the positioning protrusion 210 is inserted into the positioning recess 211, the positioning structure 200 restricts the horizontal relative position of adjacent mid-section units. Construction personnel check the node balls 110 and rod assemblies 120 at adjacent connection edges according to the numbering and direction markings to avoid mismatches in connection position or direction.

[0164] S5. Assembly error adjustment

[0165] After the initial positioning of adjacent mid-units is completed, the gaps between connecting edges, the center position of node ball 110, the elevation of the upper and lower chord layers, the docking position of the rod assembly 120, and the overall axis deviation are measured and verified.

[0166] When there is a vertical elevation deviation at the connection edge, the support height of the corresponding support node is adjusted by the height adjustment component of the temporary support structure 400; when there is a local gap change between the positioning protrusion 210 and the positioning recess 211, the elastic compensation component 2121 provides adaptive compensation through elastic deformation.

[0167] When the connection gap between adjacent mid-section units does not meet the requirements, an adjustment shim 2122 is set between the positioning protrusion 210 and the positioning recess 211 according to the measurement results. The connection gap is corrected by selecting the setting position, quantity, or thickness of the adjustment shim 2122. After the adjustment is completed, the node position, connection gap, overall elevation, and spatial dimensions are checked again.

[0168] S6, Overall Connection

[0169] After the adjacent middle assembly units have completed positioning and error adjustment, the connecting plate 310 is placed at the connection position of the adjacent middle assembly units, so that the holes on the connecting plate 310 are aligned with the corresponding mounting holes 320; the locking bolts 330 are passed through the holes on the connecting plate 310 and the mounting holes 320 in sequence, and are initially tightened.

[0170] After initial tightening, verify the insertion status of the positioning protrusion 210 and positioning recess 211, the compensation status of the elastic compensation component 2121, the setting status of the adjusting shim 2122, the fitting status of the connecting plate 310, and the spatial position of adjacent middle splicing units. After verification, finally tighten the locking bolt 330 and install an anti-loosening structure.

[0171] After adjacent mid-section units are fixedly connected, insert members are installed in the reserved positions between adjacent mid-section units to close the segmented assembly of the space frame structure. For connection positions requiring welding, welding is completed after the positioning and locking states are stable, and the welds are inspected.

[0172] After the overall connection is completed, the position of the node ball 110 of the main body of the space frame, the overall elevation, the arching state, the spatial dimensions, the axis deviation of the support point, the installation deflection, the tightness of the high-strength bolts and locking bolts 330, the installation state of the patch members, and the quality of the welds are checked and adjusted.

[0173] After the main structure of the space frame meets the design and construction requirements and forms a stable load-bearing system, the lifting device, support frame, temporary support structure 400 and other temporary construction measures are removed, and subsequent anti-corrosion coating, fireproof coating or roof construction procedures are carried out.

[0174] Example 7

[0175] like Figures 8-11As shown, this embodiment, based on embodiment six, takes the high-end valve hall roof space frame as an example to further explain the specific assembly method of gradually forming the main body of the space frame according to the building axis sections.

[0176] Based on the axial layout of the high-end valve hall roof, the main structure of the space frame is divided into four assembly areas: BC axis, AB axis, CD axis, and DE axis. Each assembly area is composed of multiple small assembly units forming corresponding medium assembly units. The overall assembly sequence of the high-end valve hall space frame is: BC axis assembly area → AB axis assembly area → CD axis assembly area → DE axis assembly area.

[0177] First, a support frame is arranged in the ground assembly area corresponding to axis BC. Following the methods described in S and S of Example 6, small assembly units are assembled sequentially, and multiple small assembly units are combined and connected to form the middle assembly unit of axis BC. The node positions, overall elevation, camber status, spatial dimensions, and tightness of high-strength bolts of the middle assembly unit of axis BC are inspected to ensure that the assembly area of ​​the axis BC space frame forms the central positioning reference for the subsequent assembly of axis sections.

[0178] After the BC axis space frame assembly area passes inspection, the AB axis space frame assembly area is assembled. Small assembly units within the AB axis range are combined to form corresponding medium assembly units, and the connecting edges of the AB axis medium assembly units facing the BC axis space frame assembly area are aligned with the corresponding connecting edges of the BC axis medium assembly units. The positioning structure 200 is used to guide and position adjacent medium assembly units, the adjustment component 212 is used to compensate for horizontal position deviations and connection gaps at the connecting edges, and the connection is then fixed using the locking component 300, with the corresponding insert rods installed.

[0179] Subsequently, following the assembly and connection methods corresponding to the AB axis space frame assembly area, the CD axis space frame assembly area is completed. The CD axis assembly unit uses the already completed BC axis space frame assembly area as the docking reference. The relative position is determined by the insertion and cooperation of the positioning protrusion 210 and the positioning recess 211. Combined with the elastic compensation component 2121, the adjusting shim 2122, and the temporary support structure 400, the horizontal deviation, connection gap, and local node elevation at the connection edge are corrected.

[0180] After the connections in the BC, AB, and CD axis space frame assembly areas are completed and verified to be qualified, the DE axis space frame assembly area is then assembled. The DE axis assembly units use the outer connection edge of the CD axis space frame assembly area as the docking reference to complete positioning, error adjustment, and fixed connection, thereby forming the main body of the high-end valve hall space frame according to the path of gradually expanding from the central reference section to adjacent sections and outer sections.

[0181] After each axis section is assembled, the position of the node ball 110, the elevation of the upper and lower chord layers, the connection status of the rod assembly 120, the fastening status of the locking assembly 300, and the installation status of the embedded rods are checked section by section. After all axis sections are connected, the overall elevation, arching status, spatial dimensions, and installation deflection of the main body of the high-end valve hall space frame are uniformly tested and adjusted.

[0182] Example 8

[0183] like Figure 12-14 As shown, this embodiment, based on embodiment six, takes the extremely low-end valve hall and its roof truss as examples to further explain the specific method of assembling the low-end valve hall according to the building axis sections.

[0184] Both the ultra-low-end valve hall and the ultra-low-end valve hall can divide the main body of the space frame into the BC axis space frame assembly area, the AB axis space frame assembly area, and the CD axis space frame assembly area. The overall assembly sequence is: BC axis space frame assembly area → AB axis space frame assembly area → CD axis space frame assembly area.

[0185] First, multiple small assembly units are assembled within the ground assembly area corresponding to the BC axis, and these units are then combined according to a preset arrangement to form the BC axis central assembly unit. After the BC axis central assembly unit is completed, its node positions, overall elevation, spatial dimensions, camber status, and member connection status are inspected to establish an assembly positioning benchmark in the middle of the lower valve hall within the BC axis space frame assembly area.

[0186] Next, the AB axis space frame assembly area is assembled. Multiple small assembly units within the AB axis range are combined to form the AB axis middle assembly unit, and its connecting edge facing the BC axis space frame assembly area is connected to the corresponding BC axis middle assembly unit. During connection, the horizontal relative position of adjacent middle assembly units is first restricted by the positioning structure 200, and then the connection gap, horizontal deviation, and local node elevation are corrected by the adjustment component 212 and the temporary support structure 400, respectively. After verification, the connection is fixed by the locking component 300.

[0187] After the AB axis space frame assembly area is completed, the CD axis space frame assembly area is assembled. The CD axis assembly unit uses the connecting edge on the other side of the BC axis space frame assembly area as the docking reference. The connection is completed in the following order: positioning protrusion 210 is inserted into positioning recess 211, adjustment component 212 is used to compensate for installation deviation, locking component 300 is used to maintain the connection position, and inserting rods are installed. This forms the main body of the low-end valve hall space frame with the BC axis space frame assembly area as the central reference and extending sequentially to both sides of the AB and CD axes.

[0188] The lowest valve hall and the lowest valve hall adopt the same axial section assembly sequence; after the connection of the BC axis, AB axis and CD axis space frame assembly areas are completed in each lowest valve hall, the position of node ball 110, the elevation of upper and lower chord layers, the gap of connection edge, the connection status of rod assembly 120, and the tightness status of high-strength bolts and locking bolts 330 are checked, and the corresponding temporary supports and construction measures are removed after the overall inspection is qualified.

[0189] The axis numbering and section range described in this embodiment correspond to the specific engineering drawings and are used to illustrate the implementation method of assembling the low-end valve hall grid structure sequentially from the central axis section to the two side axis sections. Under other axis arrangement forms, the corresponding axis numbering can be adaptively adjusted while maintaining the assembly relationship of first forming the central assembly benchmark and then gradually expanding to the adjacent sections.

[0190] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0191] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A converter station valve hall roof grid structure, characterized in that, include: The main body of the space frame, multiple space frame assembly units, and unit connection structures for connecting adjacent space frame assembly units; The main body of the grid structure is formed by combining and connecting multiple grid assembly units along the length and width directions of the converter station valve hall roof. The space frame assembly unit includes small assembly units and medium assembly units. The small assembly unit is pre-assembled from multiple node spheres and rod components connecting adjacent node spheres. The medium assembly unit is formed by combining multiple small assembly units. The multiple medium assembly units are connected by the unit connection structure to form the space frame body. The unit connection structure includes a positioning structure disposed at the connection position of adjacent middle unit, and an adjustment component disposed at the positioning structure for compensating for installation deviations between adjacent middle units.

2. The converter station valve hall roof grid structure according to claim 1, characterized in that: The small assembly unit includes: Multiple node balls; A rod assembly, connecting adjacent node balls; A node connection assembly for connecting the node ball to the rod assembly; The rod assembly includes an upper chord arranged along the top of the main body of the space frame, a lower chord arranged along the bottom of the main body of the space frame, and a web member connecting the upper chord node ball and the lower chord node ball. The upper chord, the lower chord, the web members, and the node spheres together form a spatial grid structure.

3. The converter station valve hall roof grid structure according to claim 2, characterized in that: The main body of the space frame is a regular square pyramidal space frame structure; The node ball includes a bolt ball node, which has multiple threaded connection holes arranged circumferentially, and the multiple threaded connection holes are respectively corresponding to the spatial connection directions of the upper chord, the lower chord and the web member; The end of the rod assembly is provided with a cone or sealing plate, which is connected to the threaded connection hole by a high-strength bolt.

4. The converter station valve hall roof grid structure according to claim 1, characterized in that: The space frame assembly unit is correspondingly provided with a support frame for assembly positioning; the support frame includes: Support frame; node support, disposed on the support frame and used to support the corresponding node ball; A height adjustment component is disposed between the node support and the support frame; The height adjustment component is used to adjust the support height of the node support relative to the support frame according to the design elevation of the node ball and the arching height of the main body of the grid.

5. The converter station valve hall roof grid structure according to claim 1, characterized in that: It also includes a temporary support structure for locally supporting the node spheres of the middle unit; The temporary support structure includes: A support node is used to abut against the node ball to provide temporary support for the node ball; A support member is connected between the support node and the foundation support position to maintain the spatial stability of the support node; A height adjustment component is provided at the support node to adjust the support height of the support node so that the node ball maintains a preset spatial position.

6. The converter station valve hall roof grid structure according to claim 1, characterized in that: The positioning structure includes: The positioning protrusion is located at the edge connection position of one of the two adjacent middle splicing units; A positioning recess is provided at the edge connection position of another of the two adjacent middle splicing units and cooperates with the positioning protrusion; the inner wall of the positioning recess is provided with a guide surface, which is used to guide the positioning protrusion to move to a preset cooperation position during the process of the positioning protrusion being inserted into the positioning recess; An adjustment component is disposed between the positioning protrusion and the positioning recess; After the positioning protrusion is inserted into the positioning recess, it restricts the horizontal position of two adjacent space frame assembly units.

7. The converter station valve hall roof grid structure according to claim 6, characterized in that: The adjustment components include: An elastic compensation component is disposed on the outer wall of the positioning protrusion, and is used to generate elastic deformation during the process of the positioning protrusion being inserted into the positioning recess, so as to absorb the local positional deviation between adjacent middle splicing units. An adjusting shim is disposed between the positioning protrusion and the positioning recess to adjust the fitting clearance between the positioning protrusion and the positioning recess, thereby adjusting the connection clearance between adjacent middle assembly units.

8. The converter station valve hall roof grid structure according to claim 1, characterized in that: The unit connection structure further includes a locking assembly, which includes: A connecting plate is connected across the edge connection position of two adjacent middle splicing units, and the connecting plate is provided with a connecting hole; Mounting holes are respectively provided on two adjacent space frame assembly units; A locking bolt is inserted into the mounting hole and the connecting plate; and an anti-loosening structure is provided on the locking bolt.

9. The converter station valve hall roof grid structure according to claim 1, characterized in that: The space frame assembly unit further includes a node positioning mark structure disposed on the outer surface of the node sphere, the node positioning mark structure comprising: The numbering and identification section is used to identify the installation position of the node ball in the main body of the space frame; and The direction marking section is used to indicate the spatial installation direction of the node ball.

10. A method for assembling the roof grid structure of a converter station valve hall according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Space frame unit division: Based on the overall dimensions and structural span of the converter station valve hall roof, the space frame to be installed is divided into multiple space frame assembly areas, and each space frame assembly area is further divided into small assembly units and medium assembly units; the small assembly units serve as basic spatial structure units, and the medium assembly units are formed by combining multiple small assembly units; S2. Small unit assembly: In the ground assembly area, the node balls are connected to the rod components, so that the upper chord, lower chord, and web members form a spatial grid structure with the corresponding node balls, and the prefabrication and assembly of multiple small units are completed. S3. Formation of intermediate units: Multiple intermediate units are arranged sequentially in the valve hall roof installation area; using the positioning structure set between adjacent intermediate units, the connection positions of adjacent intermediate units maintain a preset spatial relationship; S4. Positioning and installation of intermediate assembly units: Arrange multiple intermediate assembly units sequentially in the valve hall roof installation area; utilize the positioning structure set between adjacent intermediate assembly units to maintain a preset spatial relationship in the connection position of adjacent intermediate assembly units; S5. Assembly Error Adjustment: When there is an installation deviation between adjacent middle assembly units... The positions between the middle assembly units are compensated and adjusted by adjusting the components; positional offsets caused by manufacturing errors are absorbed by elastic compensation components; and the gap size between adjacent middle assembly units is adjusted by adjusting shims. S6. Overall Connection: The adjacent intermediate splicing units are fixedly connected by locking components; the node positions, overall elevation and spatial dimensions of the main body of the grid are detected and adjusted; and the assembly of the converter station valve hall roof grid is completed.

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