Fireproof plugging structure of special steel structure

Abstract

The invention provides a fireproof plugging structure of a special steel structure, and belongs to the technical field of constructional engineering. The technical problems of poor fireproof performance, poor durability, difficulty in installation and the like in the prior art are solved. According to the fireproof plugging structure of the steel structure, inhaul cable penetrating holes are formed in a floor and a steel beam, and a floor fireproof sealing ring and a steel beam fireproof sealing ring are used for sealing annular movable gaps between oblique inhaul cables and the corresponding penetrating holes correspondingly; the sealing ring comprises a radial telescopic ring, the inner wall of the radial telescopic ring is provided with an extension sealing part capable of being sealed with the oblique inhaul cable, and the outer side of the radial telescopic ring is provided with a ring body fixing structure. The device comprises a first V-shaped telescopic unit and a second V-shaped telescopic unit which are alternately distributed in the circumferential direction, and the extending direction of the central axis A of the first V-shaped telescopic unit relative to the central axis C of the inclined inhaul cable is different from the extending direction of the central axis B of the second V-shaped telescopic unit relative to the central axis C of the inclined inhaul cable. The fireproof door has the advantages of being high in fireproof performance and durability, convenient to install and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of building engineering, and relates to fireproof engineering, in particular to a fireproof plugging structure of special steel structure. BACKGROUND

[0002] Fireproof plugging is an important building safety measure, which aims to seal or fill the building gaps, through holes and the like by using materials with fireproof, smokeproof and heat insulation properties, so as to prevent the spread of heat, flame and smoke, thereby preventing fire spreading and protecting personnel and property safety. In the prior art, the fireproof plugging is mostly of solid structure, which cannot cope with the special building structure of cable passing through the wall. For this reason, people have carried out long-term exploration and proposed various solutions.

[0003] For example, the Chinese patent document discloses a non-stress cable wall-penetrating fireproof plugging structure [application number: 201920571720.1], which comprises a wall, a wall-penetrating hole, a cable, a flame-retardant fiber filling layer, a fireproof partition, a bolt, and a flexible organic fireproof plugging material layer. The wall has a wall-penetrating hole. The cable passes through the wall-penetrating hole. The cable is surrounded by a flame-retardant fiber filling layer in the wall-penetrating hole. Adjacent cables are spaced apart. The cable is provided with a fireproof partition on both sides of the wall-penetrating hole, which is fixed on the wall by bolts. The cable is surrounded by a flexible organic fireproof plugging material layer on the outer surface of the fireproof partition. The present application can be applied to the special building structure of cable passing through the wall, and has the advantage of small cable stress.

[0004] The above scheme can be applied to the special building structure of cable passing through the wall, and has the advantage of small cable stress, but the overall structure has poor sealing performance, and the installation method is complicated and not conducive to construction. SUMMARY

[0005] The purpose of the present application is to provide a fireproof plugging structure of special steel structure with strong fireproof performance and convenient installation to solve the above problems.

[0006] To achieve the above purpose, the following technical scheme is adopted: the fireproof plugging structure of special steel structure comprises a floor and a steel beam connected thereto, the floor is provided with a floor cable hole, the steel beam is provided with a steel beam cable hole, the floor cable hole is provided with a floor fireproof sealing ring, and the steel beam cable hole is provided with a steel beam fireproof sealing ring, the floor fireproof sealing ring and the steel beam fireproof sealing ring are used to seal the annular movable gap between the inclined cable and the corresponding hole, respectively. The floor fireproof sealing ring and the steel beam fireproof sealing ring each comprise a radial expansion ring, the inner wall of the radial expansion ring is provided with an extension sealing part capable of sealing the inclined cable, and the outer side of the radial expansion ring is provided with a ring body fixing structure. The radial telescopic ring comprises at least two first V-shaped telescopic units with arc-shaped cross sections and at least two second V-shaped telescopic units with arc-shaped cross sections, which are alternately distributed along the central axis C of the diagonal cable. The extension direction of the central axis A of the first V-shaped telescopic unit relative to the central axis C of the diagonal cable is different from the extension direction of the central axis B of the second V-shaped telescopic unit relative to the central axis C of the diagonal cable.

[0007] The floor fireproof sealing ring and the steel beam fireproof sealing ring are arranged at the floor cable hole and the steel beam cable hole respectively, and the floor fireproof sealing ring and the steel beam fireproof sealing ring are blocked at both ends of the gap, so that the sealing effect is achieved by blocking both ends of the gap.

[0008] Meanwhile, the radial telescopic ring structure is arranged on the floor fireproof sealing ring and the steel beam fireproof sealing ring, and when the cable shakes between the floor and the steel beam, the radial telescopic ring can adapt to deformation, so that stress is avoided from being transmitted to the cable, thereby avoiding stress damage to the structure and having the effect of stably maintaining good fireproof performance.

[0009] The radial telescopic ring is composed of a plurality of first V-shaped telescopic units and second V-shaped telescopic units alternately distributed, and has the effect of being convenient for on-site customization and installation according to the diameter of the cable and the size of the hole.

[0010] In the above special steel structure fireproof sealing structure, each first V-shaped telescopic unit comprises at least one first V-shaped telescopic body with arc-shaped cross section, and each second V-shaped telescopic unit comprises at least one second V-shaped telescopic body with arc-shaped cross section. Each V-shaped telescopic unit can be divided into at least one telescopic body, so that the number of telescopic bodies can be flexibly selected and combined according to actual needs, and the adaptability of the structure is further improved.

[0011] In the above special steel structure fireproof sealing structure, the central axis A of the first V-shaped telescopic unit is located in the YZ plane and perpendicular to the XY plane, the central axis B of the second V-shaped telescopic unit is located in the XZ plane and inclined to the XY plane, and the central axis C of the cable is located in the XZ plane and inclined to the XY plane. The cable is diagonally through the floor and the steel beam, which means that it may not only axially extend in use, but also may complexly sway or vibrate in multiple directions. The first V-shaped telescopic unit and the second V-shaped telescopic unit with central axes located in different planes can work cooperatively to cover displacement compensation requirements in different directions, can effectively adapt to the complex axial and non-axial relative movement of the cable in three-dimensional space, and can maintain good sealing and fireproof performance.

[0012] In the special steel structure fireproof sealing structure, each first V-shaped telescopic unit comprises two first V-shaped telescopic bodies, the adjacent inner ends of the two first V-shaped telescopic bodies are welded, and the outer ends are welded and connected with the outer ends of adjacent second V-shaped telescopic bodies. Each second V-shaped telescopic unit comprises two second V-shaped telescopic bodies, the adjacent inner ends of the two second V-shaped telescopic bodies are welded, and the outer ends are welded and connected with the outer ends of adjacent first V-shaped telescopic bodies. The four first V-shaped telescopic bodies and the four second V-shaped telescopic bodies are spliced and welded to form the radial telescopic ring. By splicing and welding the four first telescopic bodies and the four second telescopic bodies to form a closed loop, the continuity and integrity of the entire sealing ring in the circumferential direction are ensured. This structure enables the sealing ring to work as a whole around the cable, and when the cable is deflected or vibrates, the force can be effectively transmitted and dispersed to the entire ring, and the telescopic units in different directions can respond cooperatively to maintain the integrity of the sealing and avoid local leakage points.

[0013] In the special steel structure fireproof sealing structure, the extension sealing part comprises inner arc plates arranged inside the respective first V-shaped telescopic bodies and the second V-shaped telescopic bodies and connected as a whole, the inner side of the inner arc plate is provided with a bent plate formed by bending, the bent plate is welded and connected with the cable towards the outer end of the annular movable gap, and the adjacent two inner arc plates are welded and connected. The inner arc plate is connected with the telescopic body as a whole, as a natural extension of the telescopic structure, and the inner arc plate can deform synchronously with the V-shaped telescopic body; the bent plate is rigidly welded with the cable, and a metal hard seal is formed at the innermost side of the annular gap, which completely blocks the smoke and fire flow path. Through the hierarchical connection design of flexible deformation and rigid sealing, the dynamic displacement of the cable can be allowed, and the reliability of the sealing under extreme conditions can be ensured.

[0014] In the special steel structure fireproof sealing structure, the ring body fixing structure comprises outer arc plates arranged outside the respective first V-shaped telescopic bodies and the second V-shaped telescopic bodies and connected as a whole, the outer arc plates are fixed to the floor or the steel beam through shot pins, and the adjacent two outer arc plates are welded and connected. The outer arc plate is connected with the telescopic body as a whole, which can form a monolithic stress structure and avoid weak connection points. The outer arc plate is fixed to the floor or the steel beam through the shot pin to form a semi-rigid connection. The shot pin allows the outer ring body to adaptively adjust within a small range, while avoiding direct transmission of cable shaking to the building structure. And a flat surface can be formed, which is convenient for subsequent full-coating fireproof coating operation.

[0015] In the special steel structure fireproof sealing structure, the first V-shaped telescopic body and the second V-shaped telescopic body each comprise a first arc-shaped plate and a second arc-shaped plate, the lower ends of the first arc-shaped plate and the second arc-shaped plate are connected into one body, the gap between the two plates gradually increases from the lower end to the upper end, the upper end of the first arc-shaped plate is connected into one body with the outer arc-shaped plate, and the upper end of the second arc-shaped plate is connected into one body with the inner arc-shaped plate. The integrally connected first arc-shaped plate and the outer arc-shaped plate and the second arc-shaped plate and the inner arc-shaped plate can adapt to multiple bending, and ensure the durability of the overall structure.

[0016] In the special steel structure fireproof sealing structure, the first V-shaped telescopic body and the second V-shaped telescopic body each comprise a first arc-shaped plate and a second arc-shaped plate, the lower ends of the first arc-shaped plate and the second arc-shaped plate are connected into one body, the gap between the two plates gradually increases from the lower end to the upper end, the upper end of the first arc-shaped plate is connected into one body with the outer arc-shaped plate, and the upper end of the second arc-shaped plate is connected into one body with the inner arc-shaped plate. The integrally connected first arc-shaped plate and the outer arc-shaped plate and the second arc-shaped plate and the inner arc-shaped plate can adapt to multiple bending, and ensure the durability of the overall structure.

[0017] In the special steel structure fireproof sealing structure, the first V-shaped telescopic body and the second V-shaped telescopic body each comprise a first arc-shaped plate and a second arc-shaped plate, the lower ends of the first arc-shaped plate and the second arc-shaped plate are connected into one body, the gap between the two plates gradually increases from the lower end to the upper end, the upper end of the first arc-shaped plate is connected into one body with the outer arc-shaped plate, and the upper end of the second arc-shaped plate is connected into one body with the inner arc-shaped plate. The integrally connected first arc-shaped plate and the outer arc-shaped plate and the second arc-shaped plate and the inner arc-shaped plate can adapt to multiple bending, and ensure the durability of the overall structure.

[0018] In the special steel structure fireproof sealing structure, the first V-shaped telescopic body and the second V-shaped telescopic body each comprise a first arc-shaped plate and a second arc-shaped plate, the lower ends of the first arc-shaped plate and the second arc-shaped plate are connected into one body, the gap between the two plates gradually increases from the lower end to the upper end, the upper end of the first arc-shaped plate is connected into one body with the outer arc-shaped plate, and the upper end of the second arc-shaped plate is connected into one body with the inner arc-shaped plate. The integrally connected first arc-shaped plate and the outer arc-shaped plate and the second arc-shaped plate and the inner arc-shaped plate can adapt to multiple bending, and ensure the durability of the overall structure.

[0019] Compared with the prior art, the special steel structure fireproof sealing structure has the advantages that: 1. The structure is designed in a split assembly mode, facilitating construction and installation; 2. The fireproof structure has multiple layers, and has good fireproof performance; 3. The structure can be selected according to different working conditions, and has strong applicability; and 4. The structure can adapt to the sway between the cable and the floor structure, and has strong durability. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 This is a cross-sectional structural diagram provided by the present invention.

[0021] Figure 2 This invention provides Figure 1 Schematic diagram of the cross-sectional structure at point aa.

[0022] Figure 3 This is a schematic diagram of the radial expansion ring structure provided by the present invention.

[0023] Figure 4 This is a schematic diagram of the radial expansion ring structure of Embodiment 2 provided by the present invention.

[0024] In the diagram, floor slab 1, floor cable perforation 11, floor fireproof sealing ring 12, elevated floor 13, height adjustment component 14, steel beam 2, steel beam cable perforation 21, steel beam fireproof sealing ring 22, radial telescopic ring 3, first V-shaped telescopic unit 31, first V-shaped telescopic body 311, second V-shaped telescopic unit 32, second V-shaped telescopic body 321, extended sealing part 33, inner arc plate 331, bending plate 332, ring body fixing structure 34, outer arc plate 341, nail 342, first arc plate 351, second arc plate 352, oblique cable 4, annular movable gap 41, annular sleeve 42, annular space 43, fireproof rock wool layer 44, and fireproof coating 5. Detailed Implementation

[0025] like Figures 1 to 3 As shown, this special steel structure fireproof sealing structure includes a floor slab 1 and a steel beam 2 connected thereto. The floor slab 1 is provided with floor cable through holes 11, and the steel beam 2 is provided with steel beam cable through holes 21. A floor fireproof sealing ring 12 is provided at the floor cable through hole 11, and a steel beam fireproof sealing ring 22 is provided at the steel beam cable through hole 21. The floor fireproof sealing ring 12 and the steel beam fireproof sealing ring 22 are used to seal the annular movable gap 41 between the inclined cable 4 and the corresponding through hole, respectively. Both the floor slab fireproof sealing ring 12 and the steel beam fireproof sealing ring 22 include a radial expansion ring 3. The inner wall of the radial expansion ring 3 is provided with an extended sealing part 33 that can seal with the inclined cable 4. The outer side of the radial expansion ring 3 is provided with a ring body fixing structure 34. The radial telescopic ring 3 includes at least two first V-shaped telescopic units 31 with arc-shaped cross-sections and at least two second V-shaped telescopic units 32 with arc-shaped cross-sections, which are alternately distributed circumferentially along the central axis C of the inclined cable 4. The direction of extension of the central axis A of the first V-shaped telescopic unit 31 relative to the central axis C of the inclined cable 4 is different from the direction of extension of the central axis B of the second V-shaped telescopic unit 32 relative to the central axis C of the inclined cable 4.

[0026] In the embodiment, the floor fireproof sealing ring 12 is arranged at the floor cable hole 11, and the steel beam fireproof sealing ring 22 is arranged at the steel beam cable hole 21, so as to block the two ends of the annular movable gap between the cable 4 and the hole, form a bidirectional sealing constraint boundary, and effectively block the propagation path of fire and smoke along the gap.

[0027] The floor fireproof sealing ring 12 and the steel beam fireproof sealing ring 22 are integrated with the radial expansion ring 3. When the cable 4 is displaced relative to the floor 1 or the steel beam 2 due to load, the radial expansion ring 3 absorbs mechanical energy through its directional deformation capacity, eliminates the structure vibration transmission path, avoids stress conduction to the cable 4 anchoring end, maintains the geometric integrity of the fireproof sealing interface, and further guarantees the stability of the fireproof performance under dynamic working conditions.

[0028] The radial expansion ring 3 is composed of the first V-shaped expansion unit 31 and the second V-shaped expansion unit 32 which are alternately distributed in the circumferential direction. The corresponding oblique cable 4 and the hole size can be matched, and rapid assembly can be carried out according to actual engineering parameters. Finally, high performance of fireproof sealing and high convenience of structure installation can be realized under any working condition.

[0029] In the embodiment, the overhead layer 13 is arranged on the top of the floor 1, the overhead layer 13 is connected with the floor 1 through the height adjusting piece 14, and the cable 4 passes through the overhead layer 13.

[0030] As shown in Figure 3 Each first V-shaped expansion unit 31 includes a first V-shaped expansion body 311 with an arc-shaped cross section, and each second V-shaped expansion unit 32 includes a second V-shaped expansion body 321 with an arc-shaped cross section.

[0031] More specifically, the central axis A of the first V-shaped expansion unit 31 is located in the YZ plane and perpendicular to the XY plane, the central axis B of the second V-shaped expansion unit 32 is located in the XZ plane and inclined to the XY plane, and the central axis C of the oblique cable 4 is located in the XZ plane and inclined to the XY plane.

[0032] More specifically, the extension sealing part 33 includes an inner arc plate 331 arranged inside each first V-shaped expansion body 311 and second V-shaped expansion body 321 and connected as a whole, the inner arc plate 331 is provided with a bending plate 332 formed by bending, the bending plate 332 is connected to the oblique cable 4 by welding and faces the outer end of the annular movable gap 41, and the adjacent two inner arc plates 331 are connected by welding.

[0033] More specifically, the ring body fixing structure 34 includes an outer arc plate 341 arranged outside each first V-shaped expansion body 311 and second V-shaped expansion body 321 and connected as a whole, the outer arc plate 341 is fixed to the floor 1 or the steel beam 2 through the nail 342, and the adjacent two outer arc plates 341 are connected by welding.

[0034] As shown in Figure 2 The first V-shaped telescopic body 311 and the second V-shaped telescopic body 321 each include a first arc-shaped plate 351 and a second arc-shaped plate 352, the lower ends of the first arc-shaped plate 351 and the second arc-shaped plate 352 are connected as one, and the gap between the two plates gradually increases from the lower end to the upper end, the upper end of the first arc-shaped plate 351 is connected as one with the outer arc-shaped plate 341, and the upper end of the second arc-shaped plate 352 is connected as one with the inner arc-shaped plate 331.

[0035] More specifically, the inclined cable 4 is provided with a fireproof coating 5 between the floor fireproof sealing ring 12 and the steel beam fireproof sealing ring 22, and the fireproof coating 5 covers the outer surfaces of the floor fireproof sealing ring 12 and the steel beam fireproof sealing ring 22.

[0036] In this embodiment, the fireproof coating 5 uses a thick-coated fireproof coating, which enhances the fireproof performance and makes the fireproof coating 5 not easy to crack when shaking. After spraying the fireproof coating, the effect is strong in integrity, beautiful and easy to maintain.

[0037] More specifically, the annular sleeve 42 is provided between the floor cable perforation 11 and the steel beam cable perforation 21, the upper and lower ends of the annular sleeve 42 are sealingly connected with the floor 1 and the steel beam 2 respectively, and the annular space 43 between the annular sleeve 42, the floor fireproof sealing ring 12, the inclined cable 4 and the steel beam fireproof sealing ring 22 is filled with a fireproof rock wool layer 44.

[0038] Embodiment Two The specific content of this embodiment is basically the same as that of Embodiment One, and the difference lies in that, as shown in Figure 4 Each first V-shaped telescopic unit 31 includes two first V-shaped telescopic bodies 311, the adjacent inner ends of the two first V-shaped telescopic bodies 311 are welded, and the outer ends are welded and connected with the outer ends of the adjacent second V-shaped telescopic bodies 321; Each second V-shaped telescopic unit 32 includes two second V-shaped telescopic bodies 321, the adjacent inner ends of the two second V-shaped telescopic bodies 321 are welded, and the outer ends are welded and connected with the outer ends of the adjacent first V-shaped telescopic bodies 311; The four first V-shaped telescopic bodies 311 and the four second V-shaped telescopic bodies 321 are spliced and welded into a radial telescopic ring 3.

[0039] In this embodiment, each first V-shaped telescopic unit 31 includes two first V-shaped telescopic bodies 311, and by increasing the number of telescopic bodies, a larger overall telescopic amount is achieved in the same space. When the cable has a larger displacement, more telescopic bodies can deform cooperatively to avoid local stress concentration.

[0040] The working principle of the above embodiment is that the steel beam fireproof sealing ring 22 at the bottom end is installed first, the segmented first V-shaped expansion body 311 and the second V-shaped expansion body 321 are assembled at intervals, the outer arc plate 341 is fixed by the nail 342, and the bent plate 332 is welded and connected with the inclined cable 4 to complete the installation of the steel beam fireproof sealing ring 22.

[0041] Subsequently, the annular sleeve 42 is connected between the floor cable hole 11 and the steel beam cable hole 21, then the annular space 43 is filled with the fireproof rock wool layer 44, and then the floor fireproof sealing ring 12 is also installed at the corresponding position of the floor cable hole 11; finally, the inclined cable 4 and the floor fireproof sealing ring 12 and the steel beam fireproof sealing ring 22 are thickly coated with the fireproof coating 5, and the installation is completed.

[0042] After the installation is completed, when the inclined cable 4 and the floor 1 and the steel beam 2 shake, the stress will be preferentially conducted to the radial expansion ring 3 to adapt to the deformation, and the inclined cable 4 will not be affected by the stress, and the stable high-efficiency fireproof performance is maintained.

[0043] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

[0044] Although the terms such as floor, floor cable hole, floor fireproof sealing ring, air layer, height adjusting member, steel beam, steel beam cable hole, steel beam fireproof sealing ring, radial expansion ring, first V-shaped expansion unit, first V-shaped expansion body, second V-shaped expansion unit, second V-shaped expansion body, extension sealing part, inner arc plate, bent plate, ring body fixing structure, outer arc plate, nail, first arc-shaped plate, second arc-shaped plate, inclined cable, annular movable gap, annular sleeve, annular space, fireproof rock wool layer, and fireproof coating are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present application, and any additional limitation is contrary to the spirit of the present application.

Claims

1. A fireproof plugging structure of special steel structure, comprising a floor (1) and a steel beam (2) connected with the floor (1), the floor (1) is provided with a floor cable hole (11), the steel beam (2) is provided with a steel beam cable hole (21), characterized in that, The floor cable hole (11) is provided with a floor fireproof sealing ring (12), and the steel beam cable hole (21) is provided with a steel beam fireproof sealing ring (22), the floor fireproof sealing ring (12) and the steel beam fireproof sealing ring (22) are used for sealing the annular movable gap (41) between the inclined cable (4) and the corresponding hole respectively. The floor fireproof sealing ring (12) and the steel beam fireproof sealing ring (22) both comprise a radial telescopic ring (3), the inner wall of the radial telescopic ring (3) is provided with an extensible sealing part (33) capable of sealing the inclined cable (4), and the outer side of the radial telescopic ring (3) is provided with a ring body fixing structure (34). The radial telescopic ring (3) comprises at least two first V-shaped telescopic units (31) and at least two second V-shaped telescopic units (32) which are alternately distributed along the central axis C of the inclined cable (4) and have arc-shaped cross sections, The central axis A of the first V-shaped telescopic unit (31) is different from the central axis B of the second V-shaped telescopic unit (32) relative to the extension direction of the central axis C of the inclined cable (4).

2. The fireproof plugging structure of a special steel structure according to claim 1, characterized in that, Each first V-shaped telescopic unit (31) comprises at least one first V-shaped telescopic body (311) with an arc-shaped cross section, and each second V-shaped telescopic unit (32) comprises at least one second V-shaped telescopic body (321) with an arc-shaped cross section.

3. The fireproof plugging structure of a special steel structure according to claim 2, characterized in that, The central axis A of the first V-shaped telescopic unit (31) is located in the YZ plane and perpendicular to the XY plane, the central axis B of the second V-shaped telescopic unit (32) is located in the XZ plane and inclined to the XY plane, and the central axis C of the inclined cable (4) is located in the XZ plane and inclined to the XY plane.

4. The fireproof plugging structure of special steel structure according to claim 2, characterized in that, Each first V-shaped telescopic unit (31) comprises two first V-shaped telescopic bodies (311), the adjacent inner ends of the two first V-shaped telescopic bodies (311) are welded, and the outer ends are welded and connected with the outer ends of adjacent second V-shaped telescopic bodies (321); Each second V-shaped telescopic unit (32) comprises two second V-shaped telescopic bodies (321), the adjacent inner ends of the two second V-shaped telescopic bodies (321) are welded, and the outer ends are welded and connected with the outer ends of adjacent first V-shaped telescopic bodies (311); Four first V-shaped telescopic bodies (311) and four second V-shaped telescopic bodies (321) are spliced and welded to form the radial telescopic ring (3).

5. A fireproof plugging structure of a special steel structure according to any one of claims 2 to 4, characterized in that, The extensible sealing part (33) comprises inner arc plates (331) arranged on the inner sides of the respective first V-shaped telescopic bodies (311) and second V-shaped telescopic bodies (321) and integrated, the inner side of the inner arc plate (331) is provided with a bending plate (332) formed by bending, the bending plate (332) is welded and connected with the inclined cable (4) towards the outer end of the annular movable gap (41), and the adjacent two inner arc plates (331) are welded and connected.

6. A fireproof plugging structure of a special steel structure according to claim 5, characterized by The ring body fixing structure (34) comprises outer arc plates (341) arranged outside the first and second V-shaped telescopic bodies (311, 321) and connected as a whole, the outer arc plates (341) are fixed to the floor (1) or the steel beam (2) through nails (342), and two adjacent outer arc plates (341) are connected by welding.

7. A fireproof plugging structure of a special steel structure according to claim 6, characterized in that, The first and second V-shaped telescopic bodies (311, 321) each comprise a first arc plate (351) and a second arc plate (352), the lower ends of the first and second arc plates (351, 352) are connected as a whole, the gap between the two plates gradually increases from the lower end to the upper end, the upper end of the first arc plate (351) is connected to the outer arc plate (341), and the upper end of the second arc plate (352) is connected to the inner arc plate (331).

8. A fireproof plugging structure of a special steel structure according to any one of claims 1 to 4, characterized in that, The inclined cable (4) is provided with a fireproof coating (5) between the floor fireproof sealing ring (12) and the steel beam fireproof sealing ring (22), the floor (1) and the steel beam (2) are each provided with the fireproof coating (5) on the floor fireproof sealing ring (12) and the steel beam fireproof sealing ring (22), and the fireproof coating (5) covers the outer surfaces of the floor fireproof sealing ring (12) and the steel beam fireproof sealing ring (22).

9. The fireproof plugging structure of a special steel structure according to claim 7, characterized in that, The annular sleeve (42) is arranged between the floor cable through hole (11) and the steel beam cable through hole (21), the annular sleeve (42) is sealingly connected to the floor (1) and the steel beam (2) at the upper and lower ends, respectively, and the annular space (43) between the annular sleeve (42), the floor fireproof sealing ring (12), the inclined cable (4) and the steel beam fireproof sealing ring (22) is filled with a fireproof rock wool layer (44).

10. A fireproof plugging structure of a special steel structure according to any one of claims 1 to 4, characterized in that, The V-shaped structure in the first and second V-shaped telescopic bodies (311, 321) is replaced by any one or more of a U-shaped, S-shaped or Z-shaped structure.

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