Large-span assembly type space steel pipe structure

Abstract

The invention discloses a large-span assembly type space steel pipe structure, and relates to the field of building steel structures, the large-span assembly type space steel pipe structure comprises a main steel pipe assembly, a modular node assembly and a prestress assembly, the main steel pipe assembly comprises a main chord member, a secondary chord member and a diagonal web member, and one end of the secondary chord member and one end of the diagonal web member are both fixed to the surface of the main chord member; the modularized node assembly comprises a cast steel node core and an outer sleeve, the outer sleeve is fixed to the surface of the cast steel node core, one end of the main chord member is sleeved with the outer sleeve, the main chord member and the secondary chord member form a spatial triangular grid, and the prestress assembly is arranged at the diagonal position of the main chord member and the cast steel node core. The large-span assembly type space steel pipe structure is formed through the arranged main body steel pipe assembly, the modularized joint assembly and the prestress assembly, the construction efficiency is guaranteed through the convenience of assembly connection subsequently, meanwhile, the structural stress and the prestress assembly at the joint can be effectively shared, the stability of the whole steel pipe structure is fully guaranteed, and the construction period is shortened. And the large-span construction requirement is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building steel structure, and particularly relates to a large-span fabricated space steel pipe structure. BACKGROUND

[0002] In recent years, with the increasing demand for large-span space structures in the construction industry, steel pipe structures have been widely used due to their high strength, lightweight and convenient construction.

[0003] The current mainstream technologies include net structure, truss structure and single-layer net shell structure. These structures form a space stress system through welding or bolt connection of steel pipes. The net structure is usually in the form of bidirectional orthogonal normal placement, and the nodes are usually welded hollow balls or bolted balls. The node stiffness after welding is large, but the on-site welding quality is difficult to control and the construction period is long. The truss structure mainly uses triangular sections, and the load is transmitted through the combination of web members and chord members. The material utilization rate is high, but the node stress concentration is significant. The single-layer net shell relies on the curved surface form to realize the spatial stiffness, and the modeling is complex and the cost is high. As can be seen, although the above existing technologies have been successfully applied, there are still many defects in their own structures, and they will still face very serious challenges in the process of large-span building construction, and it is difficult to meet the use requirements. SUMMARY

[0004] The present application provides a large-span fabricated space steel pipe structure to solve the technical problems in the background art.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme: a large-span fabricated space steel pipe structure, comprising a main steel pipe assembly, a modular node assembly and a prestressed assembly, the main steel pipe assembly comprises a main chord, a secondary chord and a diagonal web member, one end of the secondary chord and one end of the diagonal web member are fixed on the surface of the main chord, the modular node assembly comprises a cast steel node core and an outer sleeve, and the outer sleeve is fixed on the surface of the cast steel node core, one end of the main chord is sleeved in the inner part of the outer sleeve and forms a space triangular grid with the secondary chord, and the prestressed assembly is arranged at the diagonal position of the main chord and the cast steel node core.

[0006] Preferably, the outer sleeve comprises a hollow flange joint and an outer threaded sleeve, the hollow flange joint is fixed between the cast steel node core and the outer threaded sleeve, and a plurality of first accommodating grooves are formed on the inner wall of one end of the outer threaded sleeve along the circumferential direction of the outer threaded sleeve, a plurality of threaded holes are formed on the end face of one end of the hollow flange joint, and the threaded holes are in space communication with the corresponding first accommodating grooves.

[0007] Preferably, the surface of one end of the main chord is provided with a plurality of second clearance grooves and a plurality of transition holes along the circumferential direction of the end of the main chord, and the space of the second clearance grooves and the transition holes is connected. One end of the main chord can be engaged with the external threaded sleeve and then connected with the end face of the hollow flange joint. The transition hole at one end of the main chord is fitted with an assembly screw that can be threadedly connected to the threaded hole.

[0008] Preferably, an internally threaded sleeve is fitted on the outer side of the externally threaded sleeve, and the internally threaded sleeve can fully cover and seal the second relief groove and form a sealed space with the second relief groove.

[0009] Preferably, the inner side of one end of the internal threaded sleeve is fitted onto the surface of one end of the main chord, and a sealing ring is nested at the fitting point between the internal threaded sleeve and the main chord. The surface of the internal threaded sleeve is provided with several strip grooves.

[0010] Preferably, the side wall of the internal threaded sleeve is provided with a T-shaped hole that communicates with the corresponding second clearance groove space. A sealing cover plate is fitted inside the T-shaped hole, and the surface of the sealing cover plate is coplanar with the surface of the internal threaded sleeve.

[0011] Preferably, the inner wall of one end of the T-hole is provided with an internal thread, the surface of the sealing cover is provided with an external thread that can engage with the internal thread, and the sealing cover is threadedly connected to one end of the T-hole, and the surface of the sealing cover is provided with a cross-shaped groove.

[0012] Preferably, the inner wall of the other end of the internal threaded sleeve is provided with a fan-shaped groove that communicates with the corresponding second clearance groove. A fan-shaped partition is engaged in the fan-shaped groove. The surface of one side of the fan-shaped partition is in contact with the end face of the inner nut structure of the assembly screw and divides the sealing space into an outer glue injection space and an inner protective space.

[0013] Preferably, the assembly formed by the cast steel node core and the hollow flange joint has an I-shaped groove in the middle, and an anti-shear key that penetrates the hollow flange joint, the external threaded sleeve and is fixed to one end of the main chord is engaged in the I-shaped groove.

[0014] Preferably, the prestressed assembly includes a prestressed cable assembly and an auxiliary support plate. The prestressed cable assembly consists of an anchor and prestressed cables installed on the surface of the cast steel node core. The side structure of the anchor away from the cast steel node core is fixed to the auxiliary support plate fixed on the surface of the hollow flange joint.

[0015] In summary, the present invention has the following beneficial effects: 1. A large-span prefabricated spatial steel pipe structure is formed by setting up main steel pipe components, modular node components and prestressed components. In addition, the ease of assembly and connection ensures construction efficiency. At the same time, the prestressed components can effectively distribute the structural stress at the nodes, fully ensuring the stability of the overall steel pipe structure and meeting the construction requirements of large spans.

[0016] 2. An external sealing structure is formed by setting an internal threaded sleeve, T-hole, sealing cover plate and sector-shaped partition. The external sealing structure can cover and seal the assembly screws that play a locking role in the subsequent assembly connection of the main chord and cast steel node core. In addition, when used with the existing steel structure compatible adhesive, it can further improve the connection strength between the main chord and the cast steel node core and optimize the overall performance of the steel pipe structure.

[0017] 3. By combining the I-shaped groove with the shear key, the performance of the main chord and the cast steel node core after assembly and connection through hollow flange joints, external threaded sleeves and assembly screws is improved to resist horizontal shear force and prevent structural slippage. Furthermore, the mechanical interlocking and force transmission mechanism ensures the structural strength and compressive strength of the overall steel pipe structure. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is a bottom view schematic diagram of the present invention; Figure 4 This is a cross-sectional schematic diagram of the hollow flange joint in this invention; Figure 5 This is the present invention. Figure 4 Enlarged view of point A in the middle; Figure 6 This is an enlarged schematic diagram of the second clearance groove of the present invention; Figure 7 This is an enlarged schematic diagram of the sector-shaped partition of the present invention; Figure 8 This is an enlarged schematic diagram of the shear-resistant key of the present invention; Figure 9 This is an assembly diagram of the steel pipe structure of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Main chord; 2. Secondary chord; 3. Diagonal web member; 4. Cast steel node core; 5. Hollow flange joint; 6. External threaded sleeve; 7. First clearance groove; 8. Threaded hole; 9. Second clearance groove; 10. Transition hole; 11. Assembly screw; 12. Internal threaded sleeve; 13. T-hole; 14. Sealing cover plate; 15. Fan-shaped partition plate; 16. I-shaped groove; 17. Shear key; 18. Sealing ring (18); 19. Strip groove; 20. Auxiliary support plate; 21. Prestressed cable assembly. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to preferred embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1-6 , Figure 9 A large-span prefabricated spatial steel pipe structure includes a main steel pipe assembly, a modular node assembly, and a prestressed assembly. The main steel pipe assembly includes a main chord 1, a secondary chord 2, and a diagonal web member 3. One end of the secondary chord 2 and one end of the diagonal web member 3 are both fixed to the surface of the main chord 1. The modular node assembly includes a cast steel node core 4 and an outer sleeve. The outer sleeve is fixed to the surface of the cast steel node core 4. One end of the main chord 1 is fitted inside the outer sleeve and forms a spatial triangular grid with the secondary chord 2. The outer sleeve includes a hollow flange joint 5 and an external threaded sleeve 6, thereby ensuring sufficient connection area with subsequent related structures and improving the stability of the structure after connection. The hollow flange joint 5 is fixed between the cast steel node core 4 and the external threaded sleeve 6, and the inner wall of one end of the external threaded sleeve 6 is provided with several first clearance grooves 7 along its circumference, thereby providing clearance space for the assembly of adjacent structures. This ensures that, in addition to avoiding structural interference between multiple structures, the flexibility and convenience of the installation process of adjacent structures can be maintained. The end face of one end of the hollow flange joint 5 is provided with several threaded holes 8, thereby providing fastener locking channels for the assembly of adjacent structures, ensuring smooth assembly. The threaded holes 8 are connected to the corresponding first clearance grooves 7, further forming a larger clearance space for installation, reducing the difficulty of subsequent assembly operations. The surface of one end of the main chord 1 is provided with several second clearance grooves 9 and several transition holes 10 along the circumference of the end of the main chord 1. The space of the second clearance grooves 9 and the transition holes 10 is connected. Thus, the transition holes 10 are used as a further extension of the clearance space of the second clearance grooves 9, providing sufficient clearance space for the installation of fasteners used later. One end of the main chord 1 can be engaged with the external threaded sleeve 6 and then connected with the end face of the hollow flange joint 5, ensuring sufficient connection contact area. The transition hole 10 at one end of the main chord 1 is fitted with an assembly screw 11 that can be threadedly connected to the threaded hole 8. Thus, the assembly screw 11 is used as a fastener to detachably assemble and connect the main chord 1 and the hollow flange joint 5. This ensures the structural strength of the main chord 1 and the hollow flange joint 5 after assembly and connection, while maintaining the convenience of maintenance and replacement of the main chord 1 and the hollow flange joint 5.

[0022] The prestressed components are positioned diagonally between the main chord 1 and the cast steel node core 4. The prestressed components include a prestressed cable assembly 21 and an auxiliary support plate 20. The prestressed cable assembly 21 consists of an anchor and prestressed cables installed on the surface of the cast steel node core 4. The side structure of the anchor away from the cast steel node core 4 is fixed to the auxiliary support plate 20, which is fixed on the surface of the hollow flange joint 5. Thus, in addition to using the auxiliary support plate 20 as a transition structure to stably assemble and connect the prestressed cable assembly 21 and the cast steel node core 4 together, the prestressed cable assembly 21, supported by the auxiliary support plate 20, can distribute the stress experienced by the cast steel node core 4 during the subsequent use of the prefabricated steel pipe structure, fully ensuring the reliability and stability of the overall prefabricated steel pipe structure in the construction and use of large-span spaces.

[0023] In use, the main chord 1 and several secondary chords 2 and several diagonal web members 3 fixed on the surface of the main chord 1 form a modular prefabricated steel pipe assembly. The prefabricated steel pipe assemblies in adjacent positions can be supported and transitioned by cast steel node cores 4, thereby realizing the construction of prefabricated large spaces. The specific operation is as follows. One end of the main chord 1 is fitted with the corresponding external threaded sleeve 6 on the surface of the cast steel node core 4 and passes through the external threaded sleeve 6 until it is in contact with the end face of the hollow flange joint 5. The multiple threaded holes 8 inside the hollow flange joint 5 are aligned one by one with the corresponding number of transition holes 10 on one end of the main chord 1. Then, the corresponding number of assembly screws 11 are fitted one by one with the transition holes 10 and then threadedly connected with the threaded holes 8. The second clearance groove 9 provides clearance space during the spiral engagement of the assembly screws 11, thereby realizing the assembled connection between the main chord 1 and the cast steel node core 4. The remaining assembled steel pipe components are also assembled one by one with the remaining hollow flange joints 5 and external threaded sleeves 6 on the surface of the cast steel node core 4 according to the above steps. The prestressed cable assembly 21 is installed diagonally between the main chord 1 and the cast steel node core 4, supported by the auxiliary support plate 20. In addition to using the auxiliary support plate 20 as a transition structure to stably assemble and connect the prestressed cable assembly 21 and the cast steel node core 4, the prestressed cable assembly 21, supported by the auxiliary support plate 20, can distribute the stress on the cast steel node core 4 during the subsequent use of the prefabricated steel pipe structure, thus fully ensuring the reliability and stability of the overall prefabricated steel pipe structure in the construction and use of large-span spaces.

[0024] like Figures 4-6 An internal threaded sleeve 12 is fitted on the outer side of the external threaded sleeve 6. The internal threaded sleeve 12 can fully cover and seal the second relief groove 9 and form a sealed space with the second relief groove 9. This provides closed protection for the assembly screw 11 fitted inside the second relief groove 9 and used for locking, thereby reducing the corrosion rate of the assembly screw 11 in the use environment, creating favorable conditions for subsequent assembly disassembly and maintenance, reducing the difficulty of disassembly and maintenance of the overall steel pipe structure, and at the same time, protecting most of the steel pipe structure as much as possible, creating favorable conditions for the secondary use of the steel pipe structure that still has good structural performance, thereby reducing the use cost and maintenance cost. The inner side of one end of the internal threaded sleeve 12 is fitted onto the surface of one end of the main chord 1, further enhancing the connection strength between the internal threaded sleeve 12 and the main chord 1, optimizing the compressive strength of subsequent structural connections, and a sealing ring 18 is nested at the fitting point between the internal threaded sleeve 12 and the main chord 1. Several strip grooves 19 are provided on the surface of the internal threaded sleeve 12, further enhancing the sealing and protection effect of the internal threaded sleeve 12 on the assembly screw 11 fitted inside the second clearance groove 9 and used for locking, maximizing the service life of the assembly screw 11.

[0025] In use, considering the corrosion of the assembly screw 11 caused by the actual use environment, which would increase the difficulty of disassembling the assembly screw 11, an internally threaded sleeve 12 is used to seal and protect the assembly screw 11 in the locked state. The specific operation is as follows: After the main chord 1 is fitted with the hollow flange joint 5 and the external threaded sleeve 6 and locked to the hollow flange joint 5 by multiple mounting screws 11, the internal threaded sleeve 12, which was originally pre-fitted outside one end of the main chord 1, is moved closer to the external threaded sleeve 6, thereby making the internal threaded sleeve 12 threadedly connected to the external threaded sleeve 6 until the internal threaded sleeve 12 covers and seals the multiple second clearance grooves 9. This isolates the mounting screws 11 from moisture and other substances that can corrode them in the actual use environment, thus fully ensuring the service life of the mounting screws 11 and the threaded holes 8. This is necessary when the entire steel pipe structure needs to be disassembled later. When the internal threaded sleeve 12 can be rotated in the opposite direction, the internal threaded sleeve 12 can be moved away from the mounting screw 11 until it is completely out of the mounting screw 11. The mounting screw 11, which is in a newer structure, can provide a smooth turning effect for subsequent disassembly operations. Moreover, for the disassembled cast steel node core 4 and related structures on the cast steel node core 4, as long as there is no obvious structural damage, the newer threaded hole 8 can still provide the structural conditions for assembly and locking, thereby meeting the needs of secondary use, reducing the cost of use, and also enabling the cast steel node core 4 and related structures on the cast steel node core 4 to have good reuse efficiency.

[0026] like Figures 4-7 The side wall of the internal threaded sleeve 12 is provided with a T-shaped hole 13 that communicates with the space of the corresponding second clearance groove 9. A sealing cover plate 14 is installed inside the T-shaped hole 13. This provides a clearance channel for subsequent glue injection operation and can also perform secondary sealing treatment on the space after glue injection, further optimizing the use effect of the structure. Moreover, the surface of the sealing cover plate 14 is coplanar with the surface of the internal threaded sleeve 12, which not only avoids structural interference but also ensures the simple appearance of the overall structure of the internal threaded sleeve 12.

[0027] In use, considering the need to improve the connection strength between the main chord 1 and the cast steel node core 4, one end of the main chord 1 is fitted with the corresponding external threaded sleeve 6 on the surface of the cast steel node core 4, and the external threaded sleeve 6 is passed through until it is in contact with the end face of the hollow flange joint 5. The multiple threaded holes 8 inside the hollow flange joint 5 are aligned one by one with the corresponding number of transition holes 10 on one end of the main chord 1. Then, the corresponding number of assembly screws 11 are fitted one by one with the transition holes 10 and then threadedly connected to the threaded holes 8. The clearance groove 9 provides clearance space during the spiral engagement of the assembly screw 11, thereby realizing the assembly connection between the main chord 1 and the cast steel node core 4. The internal threaded sleeve 12, which was originally pre-fitted on one end of the main chord 1, is moved closer to the external threaded sleeve 6, thereby making the internal threaded sleeve 12 and the external threaded sleeve 6 threadedly connected until the internal threaded sleeve 12 covers and seals the multiple second clearance grooves 9, thereby isolating the assembly screw 11 from moisture and other substances that can corrode it in the actual use environment. After a series of steps are completed. Using existing glue injection devices, such as syringes, a certain amount of glue suitable for steel structures is injected into the interior of multiple second relief grooves 9 through T-holes 13, thereby filling multiple sealing spaces formed by the multiple second relief grooves 9 and the internal threaded sleeves 12. Then, the glue is used to further strengthen and enhance the connection strength between the internal threaded sleeves 12 and the main chord 1, the main chord 1 and the external threaded sleeves 6, the main chord 1 and the hollow flange joint 5, and the assembly screws 11 and the hollow flange joint 5, thereby further improving the assembly connection strength of the overall steel pipe structure. As for the sealed space after it is filled, some glue is used to fit the sealing cover plate 14 onto the open port of the T-hole 13 to seal it, ensuring the integrity of the overall structure of the internal thread sleeve 12.

[0028] like Figures 4-7 The inner wall of one end of the T-hole 13 is provided with an internal thread, and the surface of the sealing cover plate 14 is provided with an external thread that can engage with the internal thread. The sealing cover plate 14 is threadedly connected to one end of the T-hole 13, and the surface of the sealing cover plate 14 is provided with a cross-shaped groove.

[0029] In use, considering the connection strength between the sealing cover plate 14 and the T-hole 13, a certain amount of glue suitable for steel structures is injected into the interior of multiple second clearance grooves 9 through the T-hole 13 to fill the multiple sealing spaces formed by the multiple second clearance grooves 9 and the internal threaded sleeve 12. Then, the glue is used to further strengthen the connection strength between the internal threaded sleeve 12 and the main chord 1, the main chord 1 and the external threaded sleeve 6, the main chord 1 and the hollow flange joint 5, and the assembly screw 11 and the hollow flange joint 5. Then, the sealing cover plate 14 is threaded into the open port of the corresponding T-hole 13 using a wrench with a cross-shaped groove. This seals the internal space of the T-hole 13 while ensuring the connection strength between the two, reducing the probability of accidental detachment later.

[0030] like Figures 4-7 The inner wall of the other end of the internal threaded sleeve 12 is provided with a fan-shaped groove that communicates with the corresponding second clearance groove 9. A fan-shaped partition 15 is snapped into the fan-shaped groove. The surface of one side of the fan-shaped partition 15 is in contact with the end face of the inner nut structure of the mounting screw 11 and divides the sealing space into an outer glue injection space and an inner protective space.

[0031] In use, considering the structural strength of the sealed space and the need for reciprocating disassembly and reassembly of the assembly screw 11, before injecting glue through the T-hole 13, the fan-shaped partition 15 is engaged with the corresponding fan-shaped groove until the surface of one side of the fan-shaped partition 15 is in contact with the end face of the inner nut structure of the assembly screw 11, thus dividing the sealed space into an outer glue injection space and an inner protective space. Then, a certain amount of glue suitable for the steel structure is injected into the interior of multiple outer glue injection spaces through the T-hole 13. Subsequently, the glue is used to further strengthen the connection strength between the inner threaded sleeve 12 and the main chord 1, the main chord 1 and the outer threaded sleeve 6, the main chord 1 and the hollow flange joint 5, and the assembly screw 11 and the hollow flange joint 5. At the same time, the fan-shaped partition 15, as a reinforcing structure, can not only improve the connection strength between the second clearance groove 9 and the inner threaded sleeve 12, but also protect the assembly screw 11 from glue, maintaining the convenience of subsequent disassembly.

[0032] like Figures 4-8 The assembly formed by the cast steel node core 4 and the hollow flange joint 5 has an I-shaped groove 16 in the middle. The I-shaped groove 16 is fitted with a shear key 17 that passes through the hollow flange joint 5 and the external threaded sleeve 6 and is fixed to one end of the main chord 1.

[0033] In use, considering the stability of the main chord 1 and the cast steel node core 4 during assembly, the combination of the I-shaped groove 16 and the shear key 17 is used to improve the performance of the main chord 1 and the cast steel node core 4 after assembly and connection through the hollow flange joint 5, the external threaded sleeve 6 and the assembly screw 11 to resist horizontal shear force and prevent structural slippage. Furthermore, the mechanical interlocking and force transmission mechanism ensures the structural strength and compressive strength of the overall steel pipe structure.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention. The invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A large-span prefabricated spatial steel pipe structure, comprising a main steel pipe assembly, modular node assemblies, and prestressed assemblies, characterized in that: The main steel pipe assembly includes a main chord (1), a secondary chord (2), and a diagonal web member (3). One end of the secondary chord (2) and one end of the diagonal web member (3) are fixed to the surface of the main chord (1). The modular node assembly includes a cast steel node core (4) and an outer sleeve. The outer sleeve is fixed to the surface of the cast steel node core (4). One end of the main chord (1) is fitted inside the outer sleeve and forms a spatial triangular grid with the secondary chord (2). The prestressed component is set at the diagonal position between the main chord (1) and the cast steel node core (4).

2. The large-span prefabricated space steel pipe structure according to claim 1, characterized in that: The outer sleeve includes a hollow flange joint (5) and an external threaded sleeve (6). The hollow flange joint (5) is fixed between the cast steel node core (4) and the external threaded sleeve (6). The inner wall of one end of the external threaded sleeve (6) is provided with a number of first clearance grooves (7) along its circumference. The end face of one end of the hollow flange joint (5) is provided with a number of threaded holes (8), and the threaded holes (8) are spatially connected with the corresponding first clearance grooves (7).

3. The large-span prefabricated space steel pipe structure according to claim 2, characterized in that: The surface of one end of the main chord (1) is provided with several second clearance grooves (9) and several transition holes (10), and the space of the second clearance grooves (9) and the transition holes (10) are connected. One end of the main chord (1) can be engaged with the external threaded sleeve (6) and then connected with the end face of the hollow flange joint (5). The transition hole (10) at one end of the main chord (1) is fitted with an assembly screw (11) that can be threadedly connected to the threaded hole (8).

4. The large-span prefabricated space steel pipe structure according to claim 1, characterized in that: The outer side of the external threaded sleeve (6) is fitted with an internal threaded sleeve (12), and the internal threaded sleeve (12) can fully cover and seal the second relief groove (9) and combine with the second relief groove (9) to form a sealed space.

5. A large-span prefabricated space steel pipe structure according to claim 4, characterized in that: The inner side of one end of the internal threaded sleeve (12) is fitted onto the surface of one end of the main chord (1), and a sealing ring (18) is nested at the fitting point between the internal threaded sleeve (12) and the main chord (1). Several strip grooves (19) are provided on the surface of the internal threaded sleeve (12).

6. A large-span prefabricated space steel pipe structure according to claim 4, characterized in that: The side wall of the internal threaded sleeve (12) is provided with a T-shaped hole (13) that communicates with the space of the corresponding second clearance groove (9). A sealing cover plate (14) is fitted inside the T-shaped hole (13), and the surface of the sealing cover plate (14) is coplanar with the surface of the internal threaded sleeve (12).

7. A large-span prefabricated space steel pipe structure according to claim 4, characterized in that: The inner wall of one end of the T-hole (13) is provided with an internal thread, and the surface of the sealing cover plate (14) is provided with an external thread that can engage with the internal thread. The sealing cover plate (14) is threadedly connected to one end of the T-hole (13), and the surface of the sealing cover plate (14) is provided with a cross-shaped groove.

8. A large-span prefabricated space steel pipe structure according to claim 4, characterized in that: The inner wall of the other end of the internal threaded sleeve (12) is provided with a fan-shaped groove that communicates with the corresponding second clearance groove (9). A fan-shaped partition (15) is snapped into the fan-shaped groove. The surface of one side of the fan-shaped partition (15) is in contact with the end face of the inner nut structure of the mounting screw (11) and divides the sealing space into an outer glue injection space and an inner protective space.

9. A large-span prefabricated space steel pipe structure according to claim 1, characterized in that: The cast steel node core (4) and the hollow flange joint (5) form an assembly with an I-shaped groove (16) in the middle. The I-shaped groove (16) is fitted with a shear key (17) that passes through the hollow flange joint (5), the external threaded sleeve (6) and is fixed to one end of the main chord (1).

10. A large-span prefabricated space steel pipe structure according to claim 2, characterized in that: The prestressed assembly includes a prestressed cable assembly (21) and an auxiliary support plate (20). The prestressed cable assembly (21) consists of an anchor and a prestressed cable installed on the surface of the anchor and the cast steel node core (4). The side structure of the anchor away from the cast steel node core (4) is fixed to the auxiliary support plate (20) fixed on the surface of the hollow flange joint (5).

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