Adjustable fireproof and waterproof buffer sealing sleeve and installation method thereof

Abstract

The application discloses a kind of adjustable wall fireproof waterproof buffer sealing sleeve and its installation method, including outer sleeve assembly, inner sleeve assembly, buffer assembly, fireproof plugging section and sealing compression assembly.The application forms the rigid whole that cannot be relatively slid by the cooperation of outer sleeve assembly and inner sleeve assembly, effectively prevents splicing place leakage and misplacement;Buffer assembly is completely isolated by sheath with buffer and external fireproof blocking material, buffer is independently compressed and rebounds in the cavity inside sheath to absorb radial vibration, prevent inner sleeve assembly and outer sleeve assembly from direct collision, fireproof plugging section is filled in annular gap middle part, and heat insulation barrier is formed by fire-expanding blocking material in fire, heat insulation ring is physically isolated with both ends sealing area to delay heat conduction, and sealing compression assembly provides fireproof waterproof combined sealing.

Description

Technical Field

[0001] This invention relates to the field of fireproof sealing technology, and in particular to an adjustable through-wall fireproof and waterproof buffer sealing sleeve and its installation method. Background Technology

[0002] In industrial and civil buildings, pipelines for water supply, drainage, HVAC, gas, and cables must penetrate walls, floors, or underground structures. These penetration points are weak points in the building's fire protection and waterproofing systems. Current technologies primarily address leakage with waterproofing sealing solutions (such as flexible waterproof sleeves), while fireproofing solutions (such as fire-resistant putty and fire-resistant boards) address fire hazards separately. These two systems are constructed independently and lack integration. Furthermore, thermal expansion and contraction, foundation settlement, and equipment vibration during pipeline operation cause relative displacement and vibration between the pipeline and the wall. Existing devices often lack effective buffering and displacement compensation mechanisms, and after long-term service, the sealing materials are prone to aging and loosening, leading to seal failure.

[0003] Existing technologies include solutions that combine heat-expanding material units with expansion sleeves to achieve wall thickness adaptation and fireproof sealing. However, traditional sleeves only provide support and protection, requiring separate fireproofing (such as filling with fireproof sealant) and waterproofing (such as applying sealant) after installation. This involves multiple secondary construction steps, is time-consuming, and has low construction efficiency. Gaps easily appear between the fireproof sealant and the sleeve, pipe / cable. After long-term use, the sealant is prone to aging and cracking, allowing smoke and flames to spread through the gaps, and also causing water leakage, failing to meet fire safety acceptance standards. Fire pipes vibrate during operation, and traditional sleeves lack a buffer structure between them, making the connection between the sleeve and the wall / pipe prone to cracking, compromising the fireproof sealing effect. Traditional sleeves have fixed sizes and cannot adapt to pipes / cables of different diameters or walls / floors of different thicknesses, resulting in poor versatility. If pipes / cables need to be replaced or repaired, the fireproof sealant and sealing structure must be damaged, and resealing and waterproofing must be performed after repair, leading to high maintenance costs and difficulties.

[0004] In summary, existing wall sleeves cannot achieve "one-time installation and multi-functional integration," and are cumbersome to install, have poor sealing and fireproofing effects, and weak adaptability. There is an urgent need to develop a technical solution to solve the above problems. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides an adjustable through-wall fireproof and waterproof buffer sealing sleeve and its installation method, which integrates fireproof, waterproof, vibration-proof, and crack-proof functions. It can be installed in one go without secondary sealing and waterproofing treatment, simplifying the construction process and improving construction efficiency. At the same time, it is compatible with pipes / cables of different diameters and walls / floors of different thicknesses, which facilitates later maintenance.

[0006] To achieve the above-mentioned technical objectives, the technical solution adopted by this invention is as follows: An adjustable through-wall fireproof and waterproof buffer sealing sleeve includes an outer sleeve assembly, an inner sleeve assembly, a buffer assembly, a fireproof sealing section, and a sealing and pressing assembly. The outer sleeve assembly includes a pre-embedded pipe section and an outer pipe section. The pre-embedded pipe section is a hollow cylinder, and its outer wall is integrally formed with at least two sets of annular water-stopping elements. One end of the pre-embedded pipe section is provided with a first interface, and one end of the outer pipe section is provided with a second interface adapted to the first interface. The pre-embedded pipe section and the outer pipe section are connected by the first interface and the second interface. The radial contact surface of the first interface is provided with an installation groove, and a sealing element is embedded inside the installation groove. The axial end face of the first interface is provided with a first annular groove, and the first annular groove is filled with... The pre-embedded pipe section and the outer pipe section are filled with high-temperature resistant sealant. After being inserted and adjusted to a certain length, they are fixed together by radial bolts to form a rigid whole. A flange is provided at the end of each pre-embedded pipe section and the outer pipe section away from the first interface. A second annular groove is provided at the other end of the flange, and an expansion strip is embedded inside the second annular groove. The inner sleeve assembly is a rigid metal pipe, coaxially disposed inside the outer sleeve assembly, forming an annular gap between the inner sleeve assembly and the outer sleeve assembly. A reducing ring assembly is provided in the middle of the inner wall of the inner sleeve assembly. The reducing ring assembly is detachably connected to the inner wall of the inner sleeve assembly. The reducing ring assembly is composed of multiple arc-shaped metal blocks spliced ​​together, and the inner diameter of the reducing ring assembly is equal to the diameter of the pipe to be inserted. The outer diameter of the conduit is adapted to the inner diameter of the conduit. The inner walls of both ends of the inner sleeve assembly are respectively provided with third annular grooves, and anti-slip rubber rings are embedded inside the third annular grooves. The buffer assembly is sleeve-shaped and is disposed inside the annular gap, close to both ends of the inner sleeve assembly. Multiple sets of buffer assemblies are evenly arranged along the circumference. Each set of buffer assemblies includes a sheath, a buffer element, and a support element. The sheath is fixedly connected to the inside of the outer sleeve assembly. The sheath has a fully enclosed structure, and its inner cavity is used to accommodate the buffer element. The sheath has a telescopic opening on the side facing the inner sleeve assembly. A flexible sleeve is provided at the front end of the telescopic opening. The buffer element is disposed in the inner cavity of the sheath. The buffer member abuts against the inner bottom wall of the sheath. One end of the buffer member is a free end. The support member is slidably inserted into the telescopic opening. The support member has a radial flange at one end located in the inner cavity of the sheath. The outer diameter of the radial flange is larger than the inner diameter of the flexible sheath. The radial flange abuts against the free end of the buffer member. The other end of the support member extends out from the telescopic opening and is used to contact and cooperate with the outer wall of the inner sleeve assembly. When the buffer member is in a pre-compressed state and pushes the radial flange against the flexible sheath, the extended end of the support member lightly touches the outer wall of the inner sleeve assembly. The buffer member independently compresses and rebounds in the internal cavity of the metal sheath to absorb the radial vibration transmitted by the inner sleeve assembly.When the radial displacement of the inner sleeve assembly exceeds the preset working stroke of the buffer, the inner end face of the support abuts against the bottom surface of the inner cavity of the sheath, forming a rigid limit to prevent the inner sleeve assembly from directly colliding with the outer sleeve assembly; a fireproof sealing section is formed by filling the axial central region of the annular gap with fire-expanding sealing material, and heat insulation rings are provided at both ends of the fireproof sealing section. The heat insulation rings are fixed between the inner wall of the outer sleeve assembly and the outer wall of the inner sleeve assembly, physically isolating the fireproof sealing section from the two end regions; a sealing and pressing assembly is provided at both ends of the inner sleeve assembly, and the sealing and pressing assembly includes a first sealing ring, a second sealing ring, a third sealing ring, a pressing end cap, a third annular groove, a tension bolt, a nut, a spring assembly, and a limiting sleeve. The first sealing... The first sealing ring is configured as a ceramic fiber fireproof sealing ring, while the second and third sealing rings are both configured as water-resistant rubber sealing rings. A spacer ring is provided between the first, second, and third sealing rings. The pressing end cap is fitted onto the outside of the inner sleeve assembly. The pressing end cap is an annular disc-shaped component, with its outer edge fitting against the inner wall of the outer sleeve assembly and fitting onto the outer wall of the inner sleeve assembly. A fourth annular groove is provided on the side of the pressing end cap facing the first, second, and third sealing rings. The fourth annular groove is stepped, and the depth of each level of the fourth annular groove corresponds to the compression characteristics of the first, second, and third sealing rings, respectively. The pressing end cap abuts against the end of the outer sleeve assembly to axially press each sealing ring against the sealing working surface of the inner sleeve assembly.

[0007] In some embodiments, the multiple arc-shaped metal blocks are spliced ​​together to form a complete ring by mutually cooperating slots and protrusions. The outer arc surface of the arc-shaped metal block is tightly fitted with the inner wall of the inner sleeve assembly. The inner arc surface of the arc-shaped metal block is provided with anti-slip texture. The variable diameter ring assembly is detachably fixed to the middle of the inner wall of the inner sleeve assembly by screws.

[0008] In some embodiments, the first interface is a mortise and tenon joint with a concave structure, the second interface is a convex structure, the first interface and the second interface are fitted together, the sealing element is a sealing ring, at least two sets of the sealing ring are provided, and multiple sets of radial bolts are provided along the circumferential direction, the multiple sets of radial bolts penetrate the outer tube wall of the first interface and are screwed into the inner tube wall.

[0009] In some embodiments, the heat insulation ring is an annular metal plate, the inner edge of the heat insulation ring is connected to the outer wall of the inner sleeve assembly, the outer edge of the heat insulation ring is in clearance fit with the inner wall of the outer sleeve assembly, and the heat insulation ring divides the annular gap axially into a central fireproof sealing area and two end waterproof sealing areas, and adjacent areas are isolated by the heat insulation ring.

[0010] In some embodiments, the first sealing ring is disposed adjacent to the heat insulation ring, the third sealing ring is disposed near the end of the inner sleeve assembly, and the second sealing ring is located between the first sealing ring and the third sealing ring.

[0011] In some embodiments, the stepped annular grooves of the compression end cap correspond to the axial positions of each sealing ring.

[0012] In some embodiments, a positioning pin is also included. The positioning pin is made of a fusible alloy. At least two sets of positioning pins are symmetrically arranged and installed between the end cap of the clamping end and the end of the inner sleeve assembly. The positioning pin bears part of the pre-tightening force and assists in positioning at room temperature. When exposed to high temperature and reaching its melting point, the positioning pin melts and releases its contents.

[0013] In some embodiments, the telescopic opening is opened along the radial direction of the outer sleeve assembly, the support member is slidably inserted into the telescopic opening along the radial direction, and the contact between the protruding end of the support member and the outer wall of the inner sleeve assembly is a point contact or a line contact.

[0014] In a second aspect, the present invention also provides a method for installing an adjustable through-wall fireproof and waterproof buffer sealing sleeve, comprising the following steps: S1. Select an outer pipe section of appropriate length according to the wall thickness, insert the corresponding interface of the outer pipe section into the first interface of the pre-embedded pipe section, install a radial seal in the installation groove, inject high-temperature resistant sealant into the first annular groove, adjust the insertion depth to match the total length with the wall thickness, tighten the radial bolts to lock and fix, and complete the rigid assembly of the outer pipe assembly. S2. Select a variable diameter ring group according to the outer diameter of the pipeline to be installed. After splicing multiple arc-shaped metal blocks, fix them to the middle of the inner wall of the inner sleeve assembly. Insert the anti-slip rubber ring into the third annular groove in sequence. Put the heat insulation ring, the first sealing ring, the second sealing ring and the third sealing ring into the sealing working surfaces at both ends of the inner sleeve assembly in sequence, without pressing them down. S3. Fix the buffer components one by one on the inner wall of the outer sleeve assembly, with the support of each buffer component facing the axis of the inner sleeve assembly. S4. Insert the assembled inner sleeve assembly coaxially into the outer sleeve assembly using a guide tool, so that the protruding end of the support lightly touches the outer wall of the inner sleeve assembly; fill the fire-expanding fireproof sealant from the two ends of the annular gap into the central area between the heat insulation rings and compact it until it is full to form a fireproof sealing section. S5. The clamping end cap is inserted from the outside of the inner sleeve assembly, so that its outer edge fits against the inner wall of the outer sleeve assembly, and the center hole fits against the outer wall of the inner sleeve assembly. The clamping end cap is pushed inward along the axial direction, so that its stepped annular pressure groove compresses each sealing ring until the clamping end cap is installed in place. Then the clamping end cap is fixedly connected to the end of the outer sleeve assembly to complete the sealing and clamping. S6. Embed the expansion strip into the second annular groove on the back of the flange, push the assembled sleeve into the pre-reserved hole in the wall, so that the flange fits against the wall surface, insert the expansion bolts and tighten them, and the expansion strip is pressed against the wall to form a waterproof interface. S7. Insert the pipeline to be installed into the inner sleeve assembly, fine-tune the pipeline position so that the anti-slip rubber ring adaptively grips the outer wall of the pipeline, conduct an airtightness or watertightness test, and mark the initial compression amount of the spring assembly on the surface of the compression end cap as a reference for subsequent maintenance.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: This application provides an adjustable through-wall fireproof and waterproof buffer sealing sleeve and its installation method. Through the cooperation of the outer sleeve assembly and the inner sleeve assembly, the first and second interfaces are connected using a tenon-and-mortise joint structure. A sealing element is embedded in the installation groove, and high-temperature resistant sealant is filled in the first annular groove. After radial bolt locking, a rigid whole that cannot slide relative to each other is formed, effectively preventing leakage and misalignment at the joint. The annular water-stop element and the expansion strip work together to create a double waterproof interface inside the concrete and between the flange and the wall surface, respectively. The buffer assembly is completely isolated from the external fireproof sealing material by the sheath. The buffer component independently compresses and rebounds within the cavity of the sheath to absorb radial vibration. The radial flange of the support component cooperates with the flexible sleeve to prevent it from dislodging. When the radial displacement exceeds the preset working stroke of the buffer component, the inner end face of the support component and the bottom surface of the inner cavity of the sheath form a rigid limit, preventing direct collision between the inner sleeve assembly and the outer sleeve assembly. The fireproof sealing section fills the middle of the annular gap. The fire-expanding sealing material forms a heat insulation barrier during a fire. The heat insulation ring physically isolates it from the sealing areas at both ends to delay heat conduction. The sealing and pressing assembly compensates for the compression characteristics of the first, second, and third sealing rings by using a stepped annular groove, thereby providing a fireproof and waterproof combined seal. The variable diameter ring assembly and the anti-slip rubber ring are adapted to different pipe diameters and prevent axial movement of the pipeline. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an overall schematic diagram of an adjustable through-wall fireproof and waterproof buffer sealing sleeve proposed in this invention; Figure 2 This is a three-dimensional structural schematic diagram of the outer sleeve assembly proposed in a specific embodiment of the present invention; Figure 3 This is a cross-sectional structural diagram of the outer sleeve assembly proposed in a specific embodiment of the present invention; Figure 4 This is a cross-sectional structural diagram of the inner sleeve assembly proposed in a specific embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of the inner sleeve assembly proposed in a specific embodiment of the present invention; Figure 6 This is one of the cross-sectional structural schematic diagrams of the buffer component proposed in a specific embodiment of the present invention; Figure 7 This is a second schematic cross-sectional view of the buffer assembly proposed in a specific embodiment of the present invention; Figure 8 This is a cross-sectional structural diagram of the fireproof sealing section proposed in a specific embodiment of the present invention; Figure 9 This is a cross-sectional structural diagram of the sealing and pressing assembly proposed in a specific embodiment of the present invention; Figure 10 This is an example diagram illustrating the method applicable to an adjustable through-wall fireproof and waterproof buffer sealing sleeve according to the present invention.

[0018] Figure label: 1. Outer sleeve assembly; 11. Embedded pipe section; 12. Outer pipe section; 13. Annular waterstop; 14. First interface; 15. Second interface; 16. Mounting groove; 17. First annular groove; 18. Flange; 19. Second annular groove; 2. Inner sleeve assembly; 21. Annular gap; 22. Variable diameter ring assembly; 221. Arc-shaped metal block; 23. Third annular groove; 3. Buffer assembly; 31. Sheath; 311. Telescopic opening; 312. Flexible sleeve; 32. Buffer component; 33. Support component; 331. Radial flange; 4. Fireproof sealing section; 41. Heat insulation ring; 5. Sealing and pressing assembly; 51. First sealing ring; 52. Second sealing ring; 53. Third sealing ring; 54. Pressing end cap; 55. Fourth annular groove; 6. Positioning pin. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the invention. Similarly, the following embodiments are only some, not all, embodiments of the present invention, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1-9An adjustable through-wall fireproof and waterproof buffer sealing sleeve includes an outer sleeve assembly 1, an inner sleeve assembly 2, a buffer assembly 3, a fireproof sealing section 4, and a sealing and pressing assembly 5. The outer sleeve assembly 1 includes a pre-embedded pipe section 11 and an outer pipe section 12. The pre-embedded pipe section 11 is a hollow cylinder, and at least two sets of annular water-stopping elements 13 are integrally formed on the outer wall of the pre-embedded pipe section 11. One end of the pre-embedded pipe section 11 is provided with a first interface 14, and one end of the outer pipe section 12 is provided with a second interface 15 adapted to the first interface 14. The pre-embedded pipe section 11 and the outer pipe section 12 are connected by the first interface 14 and the second interface 15. The radial contact surface of the first interface 14 is provided with an installation groove 16, and a sealing element is embedded inside the installation groove 16. The axial end face of the first interface 14 is provided with a first annular groove 17. The first annular groove 17 is filled with high-temperature resistant sealant. The pre-embedded pipe section 11 and the outer pipe section 12 are fixed together by radial bolts after being inserted and adjusted to the specified length, forming a rigid whole. A flange 18 is provided at the end of the pre-embedded pipe section 11 and the outer pipe section 12 away from the first interface 14. A second annular groove 19 is provided at the other end of the flange 18. An expansion strip is embedded in the second annular groove 19. The inner sleeve assembly 2 is a rigid metal pipe. The inner sleeve assembly 2 is coaxially arranged inside the outer sleeve assembly 1, and an annular gap 21 is formed between the inner sleeve assembly 2 and the outer sleeve assembly 1. A reducing ring group 22 is provided in the middle of the inner wall of the inner sleeve assembly 2. The reducing ring group 22 is detachably connected to the inner wall of the inner sleeve assembly 2. The reducing ring group 22 is spliced ​​from multiple arc-shaped metal blocks 221. The inner diameter of the ring assembly 22 is adapted to the outer diameter of the pipeline to be installed. The inner walls of both ends of the inner sleeve assembly 2 are respectively provided with a third annular groove 23, and an anti-slip rubber ring is embedded inside the third annular groove 23. The buffer assembly 3 is sleeve-shaped and is located inside the annular gap 21, close to both ends of the inner sleeve assembly 2. Multiple sets of buffer assemblies 3 are evenly arranged along the circumference. Each set of buffer assemblies 3 includes a sheath 31, a buffer element 32, and a support element 33. The sheath 31 is fixedly connected to the inside of the outer sleeve assembly 1. The sheath 31 has a fully enclosed structure, and its inner cavity is used to accommodate the buffer element 32. The sheath 31 has a telescopic opening 311 on the side facing the inner sleeve assembly 2. A flexible sleeve 312 is provided at the front end of the telescopic opening 311. The buffer element 32 is located in the inner cavity of the sheath 31. One end of the punch 32 abuts against the inner bottom wall of the sheath 31, one end of the buffer 32 is a free end, and the support 33 is slidably inserted into the telescopic opening 311. The support 33 is provided with a radial flange 331 at one end of the inner cavity of the sheath 31. The outer diameter of the radial flange 331 is larger than the inner diameter of the flexible sleeve 312. The radial flange 331 abuts against the free end of the buffer 32. The other end of the support 33 extends out from the telescopic opening 311 and is used to contact and cooperate with the outer wall of the inner sleeve assembly 2. When the buffer 32 is in a pre-compressed state, when the radial flange 331 is pushed against the flexible sleeve 312, the extended end of the support 33 lightly touches the outer wall of the inner sleeve assembly 2. The buffer 32 is independently compressed and rebounded in the internal cavity of the metal sheath 31 to absorb the radial vibration transmitted by the inner sleeve assembly 2.When the radial displacement of the inner sleeve assembly 2 exceeds the preset working stroke of the buffer 32, the inner end face of the support 33 abuts against the bottom surface of the inner cavity of the sheath 31, forming a rigid limit to prevent the inner sleeve assembly 2 from directly colliding with the outer sleeve assembly 1; the fireproof sealing section 4 is formed by filling the axial middle area of ​​the annular gap 21 with fire-expanding sealing material, and heat insulation rings 41 are provided at both ends of the fireproof sealing section 4. The heat insulation rings 41 are fixed between the inner wall of the outer sleeve assembly 1 and the outer wall of the inner sleeve assembly 2, forming a physical isolation between the fireproof sealing section 4 and the two end areas; the sealing and pressing assembly 5 is provided at both ends of the inner sleeve assembly 2. The sealing and pressing assembly 5 includes a first sealing ring 51, a second sealing ring 52, a third sealing ring 53, a pressing end cap 54, and a fourth annular groove 55. The first sealing ring 51 is configured as a ceramic fiber fireproof sealing ring, the second sealing ring 53 is configured as a ceramic fiber fireproof sealing ring, the second sealing ring 54 is configured as a ceramic fiber fireproof sealing ring, the second sealing ring 55 is configured as a ceramic fiber fireproof sealing ring, the second sealing ring 52 is configured as a ceramic fiber fireproof sealing ring, the second sealing ring 53 ... fireproof sealing ring, the second sealing ring 53 is configured as a fireproof sealing ring, the second sealing ring 53 is configured as a fireproof sealing ring, the second sealing ring 53 is configured Both the first sealing ring 51 and the third sealing ring 52 are configured as water-resistant rubber sealing rings. A spacer ring is provided between the first sealing ring 51, the second sealing ring 52, and the third sealing ring 53. The pressing end cap 54 is sleeved on the outside of the inner sleeve assembly 2. The pressing end cap 54 is an annular disc-shaped component, and its outer edge fits against the inner wall of the outer sleeve assembly 1 and is sleeved on the outer wall of the inner sleeve assembly 2. The pressing end cap 54 has a fourth annular groove 55 on the side facing the first sealing ring 51, the second sealing ring 52, and the third sealing ring 53. The fourth annular groove 55 is stepped, and the depth of each level of the fourth annular groove 55 corresponds to the compression characteristics of the first sealing ring 51, the second sealing ring 52, and the third sealing ring 53, respectively. The pressing end cap 54 abuts against the end of the outer sleeve assembly 1 to axially press each sealing ring onto the sealing working surface of the inner sleeve assembly 2.

[0021] In this embodiment, the outer casing assembly 1 includes a pre-embedded pipe section 11 and an outer casing section 12. The pre-embedded pipe section 11 is a hollow cylindrical pipe section pre-embedded in the wall, which can be made of high-temperature resistant steel. Its outer wall is integrally formed with at least two sets of annular water-stopping elements 13. The annular water-stopping elements 13 are annular wing plates that protrude radially outward, used to block the water flow path along the pipe wall after being embedded in concrete, thereby enhancing the waterproof performance between the casing and the wall. One end of the pre-embedded pipe section 11 is provided with a first interface 14, and one end of the outer casing section 12 is provided with a second interface 15 adapted to the first interface 14. The first interface 14 and the second interface 15 can be connected by a tenon and mortise structure. The radial contact surface of the first interface 14 is provided with an installation groove 16, and a sealing element is embedded inside the installation groove 16. The sealing element can be an O-ring, used to prevent radial leakage. The axial end face of the first interface 14 is provided with a first annular groove 17, which is filled with high-temperature resistant sealant to achieve secondary sealing of the axial end face. After the pre-embedded pipe section 11 and the outer pipe section 12 are inserted and adjusted to their lengths, they are fixed together by radial bolts to form a rigid whole. The radial bolts penetrate the outer pipe wall and are screwed into the threaded holes of the inner pipe wall, so that the spliced ​​sections cannot slide relative to each other. Both the pre-embedded pipe section 11 and the outer pipe section 12 are provided with flanges 18 at the ends away from the first interface 14. The flange 18 is an annular connecting plate that extends radially outward. A second annular groove 19 is provided on its back. An expansion rubber strip is embedded in the second annular groove 19. The expansion rubber strip is a water-swellable rubber waterstop strip. After the flange 18 is fastened to the wall surface by expansion bolts, it is under pressure and expands on its own after a small amount of water seepage, forming a dry waterproof interface. The inner sleeve assembly 2 is a rigid metal pipe, coaxially set inside the outer sleeve assembly 1. An annular gap 21 is formed between the inner sleeve assembly 2 and the outer sleeve assembly 1. A variable diameter ring group 22 is provided in the middle of the inner wall of the inner sleeve assembly 2. The variable diameter ring group 22 is a detachable annular component spliced ​​from multiple arc-shaped metal blocks 221. Its inner diameter is adapted to the outer diameter of the pipeline to be installed, and its outer diameter is tightly fitted to the inner wall of the inner sleeve, so as to adapt the same inner sleeve body to pipelines of different diameters. A third annular groove 23 is provided on the inner wall of the pipe openings at both ends of the inner sleeve assembly 2. The third annular groove 23 is embedded with an anti-slip rubber ring. The anti-slip rubber ring is an elastic annular friction element used to hold the outer wall of the pipeline and prevent its axial movement. The buffer assembly 3 is sleeve-shaped and is set inside the annular gap 21 and close to both ends of the inner sleeve assembly 2. Multiple sets of buffer assemblies 3 are evenly arranged along the circumference. Each set of buffer assemblies 3 includes a sheath 31, a buffer element 32 and a support element 33. The sheath 31 is fixedly connected to the inside of the outer sleeve assembly 1. The sheath 31 is a rigid shell with a fully enclosed structure, used to completely isolate the buffer 32 from the external fireproof sealing material. Its internal cavity accommodates the buffer 32. The sheath 31 has a telescopic opening 311 on the side facing the inner sleeve assembly 2. A flexible sleeve 312 is provided at the front end of the telescopic opening 311. The flexible sleeve 312 refers to a dust cover that can be elastically deformed.The buffer 32 can be a helical compression spring, with one end abutting against the inner bottom wall of the sheath 31 and the other end being a free end. The support 33 is slidably inserted into the telescopic opening 311. The support 33 has a radial flange 331 at one end of the inner cavity of the sheath 31. The outer diameter of the radial flange 331 is larger than the inner diameter of the flexible sleeve 312 to prevent the support 33 from coming out of the sheath 31. The radial flange 331 abuts against the free end of the buffer 32. The other end of the support 33 extends out of the telescopic opening 311 and is used to contact and cooperate with the outer wall of the inner sleeve assembly 2. When the buffer 32 is in a pre-compressed state, and the radial flange 331 is pushed against the flexible sleeve 312, the extended end of the support 33 lightly touches the outer wall of the inner sleeve assembly 2. The buffer 32 independently compresses and rebounds in the internal cavity of the sheath 31 to absorb the radial vibration transmitted by the inner sleeve assembly 2. When the radial displacement of the inner sleeve assembly 2 exceeds the preset working stroke of the buffer 32, the inner end face of the support 33 abuts against the bottom surface of the inner cavity of the sheath 31, forming a rigid limit to prevent the inner sleeve assembly 2 from directly colliding with the outer sleeve assembly 1. The fireproof sealing section 4 is formed by filling the axial central region of the annular gap 21 with fire-expanding sealing material. Fire-expanding sealing material refers to a general term for fireproof composite materials that are solid at room temperature and can expand in volume when exposed to high temperatures. It is used to fill the annular gap 21 and form a heat insulation barrier in case of fire. Both ends of the fireproof sealing section 4 are provided with heat insulation rings 41. The heat insulation rings 41 are annular baffles made of metal material, fixed between the inner wall of the outer sleeve assembly 1 and the outer wall of the inner sleeve assembly 2. They are used to physically isolate the fireproof sealing section 4 from the two end regions and delay the conduction of heat to the sealing ring region. The sealing and pressing assembly 5 is set at both ends of the inner sleeve assembly 2 to provide a fireproof and waterproof combined seal between the pipe and the inner sleeve. The first sealing ring 51 is a ceramic fiber fireproof sealing ring, which is used to maintain the integrity of the seal under high temperature conditions. Both the second sealing ring 52 and the third sealing ring 53 are water-resistant rubber sealing rings, used for daily waterproof sealing. A spacer ring is provided between the first sealing ring 51, the second sealing ring 52, and the third sealing ring 53. The spacer ring is a metal annular spacer used to maintain the axial distance between the sealing rings. The compression end cap 54 is fitted onto the outside of the inner sleeve assembly 2. The compression end cap 54 has a stepped fourth annular groove 55 on the side facing the sealing ring. The depth of each groove corresponds to the compression characteristics of each sealing ring, used to compensate for differences in compression between sealing rings made of different materials.

[0022] In this embodiment, through the cooperative arrangement of the outer sleeve assembly 1 and the inner sleeve assembly 2, the first interface 14 and the second interface 15 adopt a tenon-and-mortise structure to achieve a socket connection. A sealing element is embedded in the mounting groove 16, and high-temperature resistant sealant is filled in the first annular groove 17. After being locked with radial bolts, a rigid whole that cannot slide relative to each other is formed, effectively preventing leakage and misalignment at the joint. The annular water-stopping element 13 and the expansion strip work together to construct a double waterproof interface between the inside of the concrete and between the flange 18 and the wall surface. The buffer assembly 3 completely isolates the buffer element 32 from the external fireproof sealing material through the sheath 31. The buffer element 32 is independently compressed and rebounded in the cavity inside the sheath 31 to absorb radial vibration. The radial flange 331 of the support 33 cooperates with the flexible sleeve 312 to prevent it from falling out. When the radial displacement exceeds the preset working stroke of the buffer element 32, the inner end face of the support 33 and the bottom surface of the inner cavity of the sheath 31 form a rigid limit to prevent the inner sleeve assembly 2 from directly colliding with the outer sleeve assembly 1. Fire-resistant sealing section 4 fills the middle of the annular gap 21. The fire-expanding sealing material forms a heat insulation barrier during a fire. The heat-insulating ring 41 physically isolates it from the sealing areas at both ends to delay heat conduction. The sealing and pressing assembly 5 compensates for the compression characteristics of the first sealing ring 51, the second sealing ring 52, and the third sealing ring 53 through a stepped annular groove, thus providing a fireproof and waterproof combined seal. The variable diameter ring assembly 22 and the anti-slip rubber ring are adapted to different pipe diameters and prevent axial movement of the pipeline.

[0023] Furthermore, in some embodiments, multiple arc-shaped metal blocks 221 are spliced ​​together to form a complete ring through mutually cooperating slots and protrusions. The outer arc surface of the arc-shaped metal block 221 is tightly fitted with the inner wall of the inner sleeve assembly 2, and the inner arc surface of the arc-shaped metal block 221 is provided with anti-slip texture. The variable diameter ring group 22 is detachably fixed to the middle of the inner wall of the inner sleeve assembly 2 by screws.

[0024] In this embodiment, multiple arc-shaped metal blocks 221 of the variable diameter ring assembly 22 are spliced ​​into a complete ring through mutually cooperating grooves and protrusions. A groove is a recessed structure formed on the side of the arc-shaped metal block 221, and a protrusion is a raised structure extending outward from the side of the arc-shaped metal block 221. The grooves and protrusions interlock to achieve circumferential positioning and assembly between the arc-shaped metal blocks 221. The outer arc surface of the arc-shaped metal block 221 is tightly fitted to the inner wall of the inner sleeve assembly 2. The inner arc surface of the arc-shaped metal block 221 is provided with anti-slip textures, which are raised and recessed patterns machined on the inner arc surface to increase the frictional resistance between the inner arc surface of the arc-shaped metal block 221 and the outer wall of the pipeline to be penetrated. The reducing ring assembly 22 is detachably fixed to the middle of the inner wall of the inner sleeve assembly 2 by screws. The screws pass through the arc-shaped metal block 221 and are screwed into the threaded hole in the pipe wall of the inner sleeve assembly 2, so that the reducing ring assembly 22 remains axially and circumferentially fixed after installation. When replacing pipelines of different diameters, the screws can be unscrewed and the arc-shaped metal block 221 with the corresponding inner diameter can be replaced.

[0025] In this embodiment, the interlocking of grooves and protrusions among multiple arc-shaped metal blocks 221 achieves circumferential positioning and precise assembly of each arc-shaped metal block 221 during the splicing process, enabling the variable diameter ring assembly 22 to form a stable complete ring structure. The outer arc surface of the arc-shaped metal block 221 fits tightly against the inner wall of the inner sleeve assembly 2, ensuring reliable contact between the variable diameter ring assembly 22 and the inner sleeve assembly 2, preventing loosening or deflection. The anti-slip texture on the inner arc surface of the arc-shaped metal block 221 increases the frictional resistance between the inner arc surface of the arc-shaped metal block 221 and the outer wall of the pipeline to be installed, thereby effectively preventing axial movement or circumferential rotation of the pipeline after installation. The variable diameter ring assembly 22 is detachably fixed to the middle of the inner wall of the inner sleeve assembly 2 by screws. The screws penetrate the arc-shaped metal block 221 and are screwed into the threaded holes in the pipe wall of the inner sleeve assembly 2, so that the variable diameter ring assembly 22 obtains both axial and circumferential rigid fixation after installation. When it is necessary to adapt to pipelines of different diameters, simply unscrew the screw and replace the arc-shaped metal block 221 with the corresponding inner diameter specification. There is no need to replace the main body of the inner sleeve assembly 2, thereby improving the versatility and ease of maintenance of the sleeve.

[0026] Furthermore, in some embodiments, the first interface 14 is a concave mortise and tenon joint, the second interface 15 is a convex structure, the first interface 14 and the second interface 15 are fitted together, the sealing element is a sealing ring, at least two sets of sealing rings are provided, and multiple sets of radial bolts are provided along the circumferential direction, the multiple sets of radial bolts penetrate the outer tube wall of the first interface 14 and are screwed into the inner tube wall.

[0027] In this embodiment, the first interface 14 is a mortise and tenon joint with a concave structure, where the concave structure refers to an annular receiving cavity formed by the axial inward recess from the end face of the pre-embedded pipe section 11. The second interface 15 is a convex structure, where the convex structure refers to an annular insertion boss extending axially outward from the end face of the outer pipe section 12. The convex structure and the concave structure interlock to achieve axial alignment and radial constraint between the pre-embedded pipe section 11 and the outer pipe section 12. The sealing element is a sealing ring, and at least two sets of sealing rings are provided, spaced axially within the mounting groove 16 to form multiple radial sealing barriers. Multiple sets of radial bolts are provided circumferentially, penetrating the outer wall of the first interface 14 and screwed into the inner wall of the second interface 15, so that the first interface 14 and the second interface 15 are rigidly locked after the length is adjusted, preventing relative sliding or loosening at the socket connection under stress.

[0028] In this embodiment, the concave structure of the first interface 14 and the convex structure of the second interface 15 interlock, achieving axial alignment and radial constraint between the pre-embedded pipe section 11 and the outer pipe section 12, thus ensuring a stable fit at the socket connection. At least two sets of sealing rings are provided, axially spaced and embedded in the mounting groove 16, forming multiple radial sealing barriers, effectively improving the sealing reliability of the radial contact surfaces of the first interface 14 and the second interface 15. Multiple sets of radial bolts penetrate the outer wall of the first interface 14 circumferentially and are screwed into the inner wall of the second interface 15, rigidly locking the first interface 14 and the second interface 15 after length adjustment, preventing relative sliding or loosening at the socket connection under stress. The synergistic effect of these structures ensures that the outer sleeve assembly 1 forms a non-slip rigid whole after splicing, guaranteeing both the flexibility of length adjustment and ensuring that the structural strength and sealing performance at the splicing interface meet the long-term use requirements of the through-wall sleeve.

[0029] Furthermore, in some embodiments, the heat insulation ring 41 is an annular metal plate, the inner edge of the heat insulation ring 41 is connected to the outer wall of the inner sleeve assembly 2, and the outer edge of the heat insulation ring 41 is in clearance fit with the inner wall of the outer sleeve assembly 1. The heat insulation ring 41 divides the annular gap 21 axially into a central fireproof sealing area and two waterproof sealing areas, and adjacent areas are isolated from each other through the heat insulation ring 41.

[0030] In this embodiment, the heat insulation ring 41 is an annular metal plate, which refers to a thin, circular plate component made of metal. Its inner edge is connected to the outer wall of the inner sleeve assembly 2, and the connection method can be welding fixation, to ensure the relative position stability between the heat insulation ring 41 and the inner sleeve assembly 2. The outer edge of the heat insulation ring 41 is clearance-fitted with the inner wall of the outer sleeve assembly 1. The clearance fit means that there is a small annular gap between the outer edge of the heat insulation ring 41 and the inner wall of the outer sleeve assembly 1. This gap allows the inner sleeve assembly 2 to avoid rigid interference with the heat insulation ring 41 when it undergoes axial displacement or radial micro-movement, while not affecting the spatial definition function of the heat insulation ring 41 for the fireproof sealing section 4. The heat insulation ring 41 divides the annular gap 21 axially into a central fireproof sealing area and two waterproof sealing areas. The central fireproof sealing area is the annular space area located between the two heat insulation rings 41, used to accommodate fire-expanding sealing material; the two waterproof sealing areas are the annular space area from the outer side of the heat insulation ring 41 to the end of the inner sleeve assembly 2, used to install the sealing and pressing assembly 5. Adjacent areas are isolated by a heat insulation ring 41. On the one hand, the heat insulation ring 41 prevents the fire-expanding sealant from overflowing into the waterproof sealing area during filling or expansion. On the other hand, it delays the transmission of the high temperature generated by the fireproof sealing section 4 to the waterproof sealing area under fire conditions, protecting the sealing ring in the sealing and pressing assembly 5 from premature thermal damage.

[0031] In this embodiment, the heat insulation ring 41 is an annular metal plate, and its inner edge is fixedly connected to the outer wall of the inner sleeve assembly 2, ensuring the relative position stability between the heat insulation ring 41 and the inner sleeve assembly 2, and making the spatial boundary between the fireproof sealing section 4 and the waterproof sealing area clear and reliable. The outer edge of the heat insulation ring 41 is fitted with the inner wall of the outer sleeve assembly 1 with a clearance fit. The small annular gap left allows the inner sleeve assembly 2 to avoid rigid interference with the heat insulation ring 41 when axial displacement or radial micro-movement occurs, thus not affecting the degree of freedom of movement of the inner sleeve assembly 2 under normal working conditions. At the same time, the spatial definition function of the heat insulation ring 41 for the fireproof sealing section 4 is not affected. The heat insulation ring 41 clearly divides the annular gap 21 axially into a central fireproof sealing area and two waterproof sealing areas at both ends, so that the fire-expanding sealing material is confined within the central fireproof sealing area, preventing it from overflowing into the two waterproof sealing areas during filling or fire expansion, and avoiding interference with the sealing and pressing assembly 5. In the event of a fire, the heat insulation ring 41 effectively delays the transmission of the high temperature generated by the fireproof sealing section 4 to the waterproof sealing areas at both ends, protecting the first sealing ring 51, the second sealing ring 52 and the third sealing ring 53 in the sealing and pressing assembly 5 from premature heat damage, thereby maintaining the sealing integrity of the sealing and pressing assembly 5 in the early stage of a fire.

[0032] Furthermore, in some embodiments, the first sealing ring 51 is disposed adjacent to the heat insulation ring 41, the third sealing ring 53 is disposed near the end of the inner sleeve assembly 2, and the second sealing ring 52 is located between the first sealing ring 51 and the third sealing ring 53.

[0033] In this embodiment, the first sealing ring 51 is disposed adjacent to the heat insulation ring 41. "Adjacent" means that the first sealing ring 51 is axially close to the unexposed side of the heat insulation ring 41, placing it at the junction of the fireproof sealing section 4 and the waterproof sealing area. This serves as the first high-temperature resistant sealing barrier after the heat insulation ring 41 in case of fire. The third sealing ring 53 is disposed near the end of the inner sleeve assembly 2. "Near the end" means that the third sealing ring 53 is axially located at the outermost edge of the waterproof sealing area, near the opening of the inner sleeve assembly. This prevents external moisture from seeping inward along the outer wall of the inner sleeve assembly 2. The second sealing ring 52 is located between the first sealing ring 51 and the third sealing ring 53. The second sealing ring 52 is a water-resistant rubber sealing ring disposed between the first sealing ring 51 and the third sealing ring 53, forming a three-layer gradient sealing structure together with the first sealing ring 51 and the third sealing ring 53.

[0034] In this embodiment, the first sealing ring 51 is positioned immediately adjacent to the heat insulation ring, so that the first sealing ring 51 is directly located at the junction of the fireproof sealing section 4 and the waterproof sealing area in the axial direction. Under fire conditions, it can serve as the first high-temperature resistant sealing barrier after the heat insulation ring 41, effectively preventing high temperature from being conducted into the waterproof sealing area. The third sealing ring 53 is positioned near the end of the inner sleeve assembly 2, located on the outermost side of the waterproof sealing area, close to the pipe opening of the inner sleeve assembly. It is used to prevent external moisture from seeping into the inner side along the outer wall of the inner sleeve assembly 2, forming the outermost waterproof defense line. The second sealing ring 52 is located between the first sealing ring 51 and the third sealing ring 53, and together with the first sealing ring 51 and the third sealing ring 53, it forms a three-layer gradient sealing structure, so that the fireproof and waterproof functions transition layer by layer from the inside to the outside along the axial direction.

[0035] Furthermore, in some embodiments, the fourth annular groove 55 of the clamping end cap 54 corresponds to the axial position of each sealing ring.

[0036] In this embodiment, the fourth annular groove 55 of the clamping end cap 54 corresponds to the axial position of each sealing ring. The fourth annular groove 55 refers to a stepped annular groove opened on the side of the clamping end cap 54 facing the sealing ring. The axial position of each step corresponds one-to-one with the installation position of the first sealing ring 51, the second sealing ring 52, and the third sealing ring 53. When the clamping end cap 54 is axially clamped by the tension bolt 56, each stepped surface of the fourth annular groove 55 presses against the outer end face of the corresponding sealing ring, so that each sealing ring is axially compressed simultaneously. The above-mentioned positional arrangement makes the high temperature resistance of the first sealing ring 51 work synergistically with the thermal insulation effect of the heat insulation ring, and the water resistance of the second sealing ring 52 and the third sealing ring 53 progressively improve, forming a sealing structure with a gradient transition of fireproof and waterproof functions from the inside to the outside.

[0037] In this embodiment, the axial positions of each step of the fourth annular groove 55 of the pressing end cap 54 correspond one-to-one with the installation positions of the first sealing ring 51, the second sealing ring 52, and the third sealing ring 53. When the pressing end cap 54 is axially pressed by the tensioning bolt 56, each step surface of the fourth annular groove 55 presses against the outer end face of the corresponding sealing ring, so that each sealing ring simultaneously receives uniform axial compression. The above-mentioned positional arrangement allows the high-temperature resistance of the first sealing ring 51 to work synergistically with the thermal insulation effect of the heat insulation ring, and the water resistance of the second sealing ring 52 and the third sealing ring 53 to progress sequentially, forming a sealing structure with a gradient transition of fireproof and waterproof functions from the inside to the outside.

[0038] Furthermore, in some embodiments, a positioning pin 6 is also included. The positioning pin 6 is made of a fusible alloy. At least two sets of positioning pins 6 are symmetrically arranged and installed at the end of the outer sleeve assembly 1. The positioning pin 6 bears part of the pre-tightening force and assists in positioning at room temperature. When it is exposed to high temperature and reaches its melting point, it melts and releases.

[0039] In this embodiment, the positioning pin 6 refers to a pin-shaped component installed at the end of the outer sleeve assembly 1. Its material is a fusible alloy, which is a metal alloy material with a low melting point. It remains solid at room temperature and possesses a certain mechanical strength, but melts and loses its structural integrity when the ambient temperature reaches its melting point. At least two sets of positioning pins 6 are symmetrically arranged. Symmetrical arrangement means that the two sets of positioning pins are arranged radially relative to each other with the axis of the outer sleeve assembly 1 as the center, to ensure balanced force distribution at the end of the outer sleeve assembly 1. The positioning pin 6 is installed at the end of the outer sleeve assembly 1 to provide auxiliary positioning after the clamping end cap 54 is connected to the end of the outer sleeve assembly 1, to bear part of the preload, and to prevent the clamping end cap 54 from loosening or deflecting under long-term use or vibration conditions. At room temperature, the positioning pin 6 helps maintain the relative position stability between the clamping end cap 54 and each sealing ring, ensuring that the compression state of the sealing rings is not changed by external disturbances. When the high temperature reaches the melting point of the fusible alloy, the positioning pin 6 melts and releases part of the pre-tightening force it bears, thereby releasing the rigid auxiliary connection between the pressing end cap and the end of the outer sleeve assembly 1. This provides space for the fire-resistant sealing material in the fire-resistant sealing section 4 to expand freely under fire conditions, thus achieving passive fire redundancy protection.

[0040] In this embodiment, the positioning pin 6 is made of a fusible alloy, which remains solid at room temperature and possesses sufficient mechanical strength. By symmetrically arranging at least two sets, the force on the end of the outer sleeve assembly 1 is balanced. The positioning pin 6 is installed at the end of the outer sleeve assembly 1, providing auxiliary positioning and bearing part of the preload after the clamping end cap 54 is connected to the end of the outer sleeve assembly 1. This prevents the clamping end cap 54 from loosening or deflecting under long-term use or vibration conditions, and helps maintain the relative position stability between the clamping end cap 54 and each sealing ring, ensuring that the compression state of the sealing rings is not changed by external disturbances. When the high temperature reaches the melting point of the fusible alloy, the positioning pin 6 melts and releases part of the preload it bears, thus releasing the rigid auxiliary connection between the clamping end cap 54 and the end of the outer sleeve assembly 1. This provides space for the fire-resistant sealing material in the fire-resistant sealing section 4 to expand freely under fire conditions, achieving passive fire redundancy protection. This allows the sleeve in this embodiment to automatically release structural constraints under fire conditions, fully utilizing the heat insulation and flame retardant function of the fire-resistant sealing section.

[0041] Furthermore, in some embodiments, the telescopic opening is opened along the radial direction of the outer sleeve assembly 1, and the support member is slidably inserted into the telescopic opening along the radial direction. The contact between the protruding end of the support member and the outer wall of the inner sleeve assembly 2 is a point contact or a line contact.

[0042] In this embodiment, the telescopic opening is opened along the radial direction of the outer sleeve assembly 1. The telescopic opening refers to a through opening opened on the side wall of the metal sheath facing the inner sleeve assembly 2. Its opening direction is consistent with the radial direction of the outer sleeve assembly 1, allowing the support member to telescopically move along the radial direction of the outer sleeve assembly 1. This is used to transfer the radial displacement of the inner sleeve assembly 2 to the buffer member along the shortest path. The support member is slidably inserted into the telescopic opening in the radial direction, which refers to the radial direction with the axis of the outer sleeve assembly 1 as a reference. The sliding direction of the support member is consistent with the displacement direction when the inner sleeve assembly 2 undergoes radial vibration. This is used to ensure that the elastic force of the buffer member acts directly on the radial offset direction of the inner sleeve assembly 2, reducing force decomposition and loss. The contact between the protruding end of the support member and the outer wall of the inner sleeve assembly 2 is either point contact or line contact. Point contact means that the end face of the protruding end of the support member is machined into a spherical or arc surface, forming a theoretically single-point or localized contact with the outer wall of the inner sleeve assembly 2. Line contact means that the end face of the protruding end of the support member is machined into an axially extending strip-shaped arc surface, forming a linear contact area along the axial direction with the outer wall of the inner sleeve assembly 2. Using point or line contact instead of surface contact reduces the contact area between the support member and the outer wall of the inner sleeve assembly 2, reducing the frictional resistance generated during relative sliding, avoiding wear of the support member or delayed buffer response due to excessive friction, and simultaneously making the support member more sensitive to the radial displacement of the inner sleeve assembly 2.

[0043] In this embodiment, the telescopic opening is formed along the radial direction of the outer sleeve assembly 1, allowing the support member to telescopically extend and retract along the radial direction of the outer sleeve assembly 1. This transmits the radial displacement of the inner sleeve assembly 2 to the buffer member along the shortest path, reducing directional deviation and force decomposition loss during displacement transmission. The sliding direction of the support member is consistent with the displacement direction of the inner sleeve assembly 2 when it vibrates radially, allowing the elastic force of the buffer member to act directly on the radial offset direction of the inner sleeve assembly 2, improving the directness and effectiveness of the buffer response. The protruding end of the support member makes point or line contact with the outer wall of the inner sleeve assembly 2, rather than surface contact, reducing the contact area between the support member and the outer wall of the inner sleeve assembly 2. This reduces the frictional resistance generated during relative sliding, preventing excessive friction from causing accelerated wear of the support member or delayed buffer response. Simultaneously, it makes the support member more sensitive to the radial displacement of the inner sleeve assembly 2, ensuring that the buffer member can absorb radial vibration energy in a timely manner. Please refer to [link to relevant documentation]. Figure 10 In a second aspect, the present invention also provides a method for installing an adjustable through-wall fireproof and waterproof buffer sealing sleeve, comprising the following steps: S1. Select an outer pipe section of appropriate length according to the wall thickness, insert the corresponding interface of the outer pipe section into the first interface 14 of the pre-embedded pipe section 11, install the radial seal in the installation groove 16, inject high temperature resistant sealant into the first annular groove 17, adjust the insertion depth to match the total length with the wall thickness, tighten the radial bolts to lock and fix, and complete the rigid assembly of the outer pipe assembly 1. S2. Select a variable diameter ring group 22 according to the outer diameter of the pipeline to be installed. After assembling multiple arc-shaped metal blocks 221, fix them in the middle of the inner wall of the inner sleeve assembly 2. Insert the anti-slip rubber ring into the third annular groove 23 in sequence. Then, put the heat insulation ring 41, the first sealing ring 51, the second sealing ring 52 and the third sealing ring 53 into the sealing working surfaces at both ends of the inner sleeve assembly 2 in sequence, without pressing them tightly. S3. The buffer components 3 are fixedly installed on the inner wall of the outer sleeve assembly 1 one by one, with the support 33 of each buffer component 3 facing the axis of the inner sleeve assembly 2. S4. Insert the assembled inner sleeve assembly 2 coaxially into the outer sleeve assembly 1 using a guide tool, so that the protruding end of the support 33 lightly touches the outer wall of the inner sleeve assembly 2; fill the fire-expanding fireproof sealing material from the two openings of the annular gap 21 into the middle area between the heat insulation rings 41 and compact it until it is filled to form a fireproof sealing section. S5. The clamping end cap 54 is inserted from the outside of the end of the inner sleeve assembly 2, so that its outer edge fits against the inner wall of the outer sleeve assembly 1, and the center hole fits against the outer wall of the inner sleeve assembly. The clamping end cap 54 is pushed inward along the axial direction, so that its fourth annular groove 55 compresses each sealing ring until the clamping end cap 54 is installed in place. Then the clamping end cap 54 is fixedly connected to the end of the outer sleeve assembly 1 to complete the sealing and clamping. S6. Embed the expansion strip into the second annular groove 19 on the back of the flange 18, push the assembled sleeve into the reserved hole in the wall, so that the flange 18 fits against the wall surface, insert the expansion bolts and tighten them, and the expansion strip is pressed against the wall to form a waterproof interface. S7. Insert the pipeline to be installed into the inner sleeve assembly 2, fine-tune the pipeline position so that the anti-slip rubber ring adaptively grips the outer wall of the pipeline, and conduct an airtightness or watertightness test. Mark the initial compression amount scale of the spring assembly 58 on the surface of the compression end cap 54 as a reference for subsequent maintenance.

[0044] In this embodiment, in step S1, an outer pipe section 12 of appropriate length is selected according to the wall thickness. The corresponding interface of the outer pipe section 12 is inserted and connected to the first interface 14 of the pre-embedded pipe section 11. The first interface 14 and the second interface 15 are interlocked to achieve axial alignment and radial constraint. A sealing element is installed in the mounting groove 16, and high-temperature resistant sealant is injected into the first annular groove 17. High-temperature resistant sealant refers to a colloidal material that can maintain bonding strength and sealing performance under high-temperature conditions. After adjusting the insertion depth to match the total length with the wall thickness, the radial bolts are tightened to lock and fix it, completing the rigid assembly of the outer sleeve assembly 1. In step S2, a variable diameter ring group 22 is selected according to the outer diameter of the pipeline to be installed. The multiple arc-shaped metal blocks 221 of the variable diameter ring group 22 are spliced ​​together to form a complete ring through the interlocking of grooves and protrusions. The screws are inserted through the arc-shaped metal blocks 221 and screwed into the threaded holes of the inner sleeve assembly 2, fixing the variable diameter ring group 22 to the middle of the inner wall of the inner sleeve assembly 2. The anti-slip rubber ring is sequentially embedded into the third annular groove 23. The heat insulation ring 41, the first sealing ring 51, the second sealing ring 52, and the third sealing ring 53 are then sequentially fitted onto the sealing working surfaces at both ends of the inner sleeve assembly 2, without being tightened. The sealing working surfaces refer to the axial areas at both ends of the outer wall of the inner sleeve assembly 2 used to accommodate each sealing ring. In S3, the buffer components 3 are fixedly installed one group at a time on the preset mounting seats on the inner wall of the outer sleeve assembly 1. The support 33 of each group of buffer components 3 faces the axial direction of the inner sleeve assembly 2, and the sheath 31 completely encapsulates the buffer component 32 in the internal cavity. In S4, the assembled inner sleeve assembly 2 is coaxially inserted into the inner sleeve assembly 1 using a guide tool. The guide tool is an auxiliary tool used to maintain the coaxiality of the inner sleeve assembly 2 and the outer sleeve assembly 1. The assembled inner sleeve assembly 2 is coaxially inserted into the outer sleeve assembly 1 using a guide tool, so that the protruding end of the support 33 lightly touches the outer wall of the inner sleeve assembly 2; fire-expanding fireproof sealant is filled into the central area between the heat insulation rings 41 from both ends of the annular gap 21 and compacted until it is full to form a fireproof sealing section. S5 The clamping end cap 54 is inserted from the outside of the end of the inner sleeve assembly 2, so that its outer edge fits against the inner wall of the outer sleeve assembly 1, and the center hole fits into the outer wall of the inner sleeve assembly. The clamping end cap 54 is pushed inward along the axial direction, so that its fourth annular groove 55 compresses each sealing ring until the clamping end cap 54 is installed in place. Then the clamping end cap 54 is fixedly connected to the end of the outer sleeve assembly 1 to complete the sealing and clamping. S6. Embed the expansion strip into the second annular groove 19 on the back of the flange 18. Push the assembled integral sleeve into the pre-drilled hole in the wall, so that the flange 18 fits against the wall surface. Insert the expansion bolts and tighten them. The expansion strip is pressed against the wall to form a waterproof interface. S7. Insert the pipeline to be installed into the inner sleeve assembly 2. Fine-tune the pipeline position so that the anti-slip rubber ring adaptively grips the outer wall of the pipeline. Adaptive grip means that the anti-slip rubber ring relies on its own elastic deformation to fit against the outer wall of the pipeline and generate frictional resistance. Perform an airtightness or watertightness test. Mark the initial compression amount scale of the spring assembly 58 on the surface of the compression end cap 54 as a reference for subsequent maintenance.

[0045] In this embodiment, step S1 involves selecting the outer pipe section 12 based on the wall thickness, achieving axial alignment and radial constraint through the interlocking of the first interface 14 and the second interface 15, inserting a sealant into the mounting groove 16, injecting high-temperature resistant sealant into the first annular groove 17, and then tightening the radial bolts to lock and fix it, so that the outer pipe assembly 1 forms a rigid whole with reliable sealing after assembly. Step S2 involves selecting a reducing ring group 22 based on the outer diameter of the pipeline to be installed, achieving rapid assembly through the interlocking of the slot and the protrusion and the fixing with screws, and accurately arranging the anti-slip rubber ring, the heat insulation ring 41, the first sealing ring 51, the second sealing ring 52, and the third sealing ring 53 on the sealing working surface to provide a foundation for subsequent sealing and tightening. Step S3 involves fixing and installing the buffer assembly 3 and aligning the support 33 towards the axis of the inner sleeve assembly 2, with the sheath 31 completely encapsulating the buffer 32 to achieve isolation from the fireproof sealing material. Step S4 involves using a guide tool to ensure that the inner sleeve assembly 2 is inserted coaxially, filling it with fire-expanding sealing material and compacting it. Step S5: Insert the clamping end cap 54 from the outside of the inner sleeve assembly 2, ensuring its outer edge fits against the inner wall of the outer sleeve assembly 1. Fit the center hole onto the outer wall of the inner sleeve assembly. Push the clamping end cap 54 axially inward, causing its fourth annular groove 55 to compress each sealing ring until the clamping end cap 54 is in place. Then, fix the clamping end cap 54 to the end of the outer sleeve assembly 1 to complete the sealing. Step S6: Embed the expansion strip into the second annular groove 19. After the entire sleeve is pushed into the pre-drilled hole in the wall, the expansion strip is compressed and adheres to the wall to form a waterproof interface. Step S7: Adjust the anti-slip rubber ring to automatically grip the outer wall of the pipeline and mark the initial compression scale of the spring assembly 58 to provide a reliable reference for subsequent maintenance.

[0046] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: This application provides an adjustable through-wall fireproof and waterproof buffer sealing sleeve and its installation method. Through the cooperation of the outer sleeve assembly 1 and the inner sleeve assembly 2, the first interface 14 and the second interface 15 adopt a tenon and mortise structure to achieve socket connection. A sealing element is embedded in the installation groove 16 and high-temperature resistant sealant is filled in the first annular groove 17. After being locked with radial bolts, a rigid whole that cannot slide relative to each other is formed, which effectively prevents leakage and misalignment at the splice. The annular water-stopping element 13 and the expansion strip work together to build a double waterproof interface between the inside of the concrete and between the flange 18 and the wall surface. The buffer assembly 3 completely isolates the buffer member 32 from the external fireproof sealing material through the sheath 31. The buffer member 32 independently compresses and rebounds within the cavity of the sheath 31 to absorb radial vibration. The radial flange 331 of the support member 33 cooperates with the flexible sleeve 312 to prevent it from coming out. When the radial displacement exceeds the preset working stroke of the buffer member 32, the inner end face of the support member 33 and the bottom surface of the inner cavity of the sheath 31 form a rigid limit to prevent direct collision between the inner sleeve assembly 2 and the outer sleeve assembly 1. The fireproof sealing section 4 fills the middle of the annular gap 21. The fire-expanding sealing material forms a heat insulation barrier during a fire. The heat insulation ring 41 physically isolates it from the sealing areas at both ends to delay heat conduction. The sealing and pressing assembly 5 compensates for the compression characteristics of the first sealing ring 51, the second sealing ring 52, and the third sealing ring 53 through a stepped annular pressure groove, thereby providing a fireproof and waterproof combined seal. The variable diameter ring assembly 22 and the anti-slip rubber ring are adapted to different pipe diameters and prevent axial movement of the pipeline.

Claims

1. An adjustable through-wall fireproof and waterproof buffer sealing sleeve, characterized in that, include: An outer casing assembly includes a pre-embedded pipe section and an outer casing section. The pre-embedded pipe section is a hollow cylinder, and its outer wall is integrally formed with at least two sets of annular water-stopping components. One end of the pre-embedded pipe section is provided with a first interface, and one end of the outer casing section is provided with a second interface adapted to the first interface. The pre-embedded pipe section and the outer casing section are connected by the first interface and the second interface. The radial contact surface of the first interface is provided with an installation groove, and a sealing component is embedded inside the installation groove. The axial end face of the first interface is provided with a first annular groove, and the first annular groove is filled with high-temperature resistant sealant. After the pre-embedded pipe section and the outer casing section are connected and adjusted to a certain length, they are fixed together by radial bolts to form a rigid whole. The ends of the pre-embedded pipe section and the outer casing section away from the first interface are both provided with flanges, and the other end of the flanges is provided with a second annular groove, and an expansion strip is embedded inside the second annular groove. The inner sleeve assembly is a rigid metal tube, coaxially disposed inside the outer sleeve assembly, forming an annular gap between the inner sleeve assembly and the outer sleeve assembly. A variable diameter ring group is provided in the middle of the inner wall of the inner sleeve assembly, which is detachably connected to the inner wall of the inner sleeve assembly. The variable diameter ring group is composed of multiple arc-shaped metal blocks spliced ​​together, and the inner diameter of the variable diameter ring group is adapted to the outer diameter of the pipeline to be inserted. A third annular groove is provided on the inner wall of the pipe openings at both ends of the inner sleeve assembly, and an anti-slip rubber ring is embedded in the third annular groove. A buffer assembly, which is sleeve-shaped, is disposed inside the annular gap and near both ends of the inner sleeve assembly. Multiple sets of buffer assemblies are evenly arranged along the circumference. Each set of buffer assemblies includes a sheath, a buffer element, and a support element. The sheath is fixedly connected to the inside of the outer sleeve assembly. The sheath is a fully enclosed structure with its inner cavity used to accommodate the buffer element. A telescopic opening is provided on the side of the sheath facing the inner sleeve assembly. A flexible sleeve is provided at the front end of the telescopic opening. The buffer element is disposed within the inner cavity of the sheath. One end of the buffer element abuts against the inner bottom wall of the sheath, and one end of the buffer element is a free end. The support element is slidably inserted into the telescopic opening. A radial flange is provided at one end of the support element located within the inner cavity of the sheath. The outer diameter of the radial flange is larger than the inner diameter of the flexible sleeve. The radial flange abuts against the free end of the buffer element. The other end of the support element extends from the telescopic opening and is used to contact and engage with the outer wall of the inner sleeve assembly. When the buffer is in a pre-compressed state, and the radial flange is pushed against the flexible sleeve, the protruding end of the support lightly touches the outer wall of the inner sleeve assembly. The buffer independently compresses and rebounds within the internal cavity of the metal sheath to absorb the radial vibration transmitted by the inner sleeve assembly. When the radial displacement of the inner sleeve assembly exceeds the preset working stroke of the buffer, the inner end face of the support abuts against the bottom surface of the inner cavity of the sheath, forming a rigid limit to prevent the inner sleeve assembly from directly colliding with the outer sleeve assembly. The fireproof sealing section is formed by filling the axial central region of the annular gap with fire-expanding sealing material. Both ends of the fireproof sealing section are provided with heat insulation rings, which are fixed between the inner wall of the outer sleeve assembly and the outer wall of the inner sleeve assembly, thus physically isolating the fireproof sealing section from the two end regions. A sealing and clamping assembly is disposed at both ends of the inner sleeve assembly. The sealing and clamping assembly includes a first sealing ring, a second sealing ring, a third sealing ring, a clamping end cap, a third annular groove, a tension bolt, a nut, a spring assembly, and a limiting sleeve. The first sealing ring is configured as a ceramic fiber fireproof sealing ring, and the second and third sealing rings are both configured as water-resistant rubber sealing rings. A spacer ring is provided between the first, second, and third sealing rings. The clamping end cap is sleeved on the outside of the inner sleeve assembly. The end cap is an annular disc-shaped component, the outer edge of which fits against the inner wall of the outer sleeve assembly and is fitted onto the outer wall of the inner sleeve assembly. The pressing end cap has a fourth annular groove on the side facing the first, second, and third sealing rings. The fourth annular groove is stepped, and the depth of each level of the fourth annular groove corresponds to the compression characteristics of the first, second, and third sealing rings, respectively. The pressing end cap abuts against the end of the outer sleeve assembly to axially press each sealing ring against the sealing working surface of the inner sleeve assembly.

2. The adjustable through-wall fireproof and waterproof buffer sealing sleeve as described in claim 1, characterized in that, The multiple arc-shaped metal blocks are spliced ​​together into a complete ring by interlocking slots and protrusions. The outer arc surface of the arc-shaped metal block is in close contact with the inner wall of the inner sleeve assembly. The inner arc surface of the arc-shaped metal block is provided with anti-slip texture. The variable diameter ring assembly is detachably fixed to the middle of the inner wall of the inner sleeve assembly by screws.

3. An adjustable through-wall fireproof and waterproof buffer sealing sleeve as described in claim 1, characterized in that, The first interface is a mortise and tenon joint with a concave structure, and the second interface is a convex structure. The first interface and the second interface are interlocked. The sealing element is a sealing ring, and at least two sets of the sealing ring are provided. Multiple sets of radial bolts are provided along the circumferential direction. The multiple sets of radial bolts penetrate the outer tube wall of the first interface and are screwed into the inner tube wall.

4. An adjustable through-wall fireproof and waterproof buffer sealing sleeve as described in claim 1, characterized in that, The heat insulation ring is an annular metal plate. The inner edge of the heat insulation ring is connected to the outer wall of the inner sleeve assembly, and the outer edge of the heat insulation ring is in clearance fit with the inner wall of the outer sleeve assembly. The heat insulation ring divides the annular gap axially into a central fireproof sealing area and two waterproof sealing areas. Adjacent areas are isolated from each other through the heat insulation ring.

5. An adjustable through-wall fireproof and waterproof buffer sealing sleeve as described in claim 1, characterized in that, The first sealing ring is disposed adjacent to the heat insulation ring, the third sealing ring is disposed near the end of the inner sleeve assembly, and the second sealing ring is located between the first sealing ring and the third sealing ring.

6. An adjustable through-wall fireproof and waterproof buffer sealing sleeve as described in claim 1, characterized in that, The stepped annular grooves of the compression end cap correspond to the axial positions of each sealing ring.

7. An adjustable through-wall fireproof and waterproof buffer sealing sleeve as described in claim 1, characterized in that, It also includes positioning pins, which are made of a fusible alloy. At least two sets of positioning pins are symmetrically arranged and installed at the end of the outer sleeve assembly. The positioning pins bear part of the preload and assist in positioning at room temperature, and melt and release when exposed to high temperature and reaching their melting point.

8. An adjustable through-wall fireproof and waterproof buffer sealing sleeve as described in claim 1, characterized in that, The telescopic opening is opened along the radial direction of the outer sleeve assembly, and the support member is slidably inserted into the telescopic opening along the radial direction. The protruding end of the support block contacts the outer wall of the inner sleeve assembly in a point contact or a line contact.

9. A method for installing an adjustable through-wall fireproof and waterproof buffer sealing sleeve, characterized in that, An adjustable through-wall fireproof and waterproof buffer sealing sleeve according to any one of claims 1-8 includes the following steps: S1. Select an outer pipe section of appropriate length according to the wall thickness, insert the corresponding interface of the outer pipe section into the first interface of the pre-embedded pipe section, install a radial seal in the installation groove, inject high-temperature resistant sealant into the first annular groove, adjust the insertion depth to match the total length with the wall thickness, tighten the radial bolts to lock and fix, and complete the rigid assembly of the outer pipe assembly. S2. Select a variable diameter ring group according to the outer diameter of the pipeline to be installed. After splicing multiple arc-shaped metal blocks, fix them to the middle of the inner wall of the inner sleeve assembly. Insert the anti-slip rubber ring into the third annular groove in sequence. Put the heat insulation ring, the first sealing ring, the second sealing ring and the third sealing ring into the sealing working surfaces at both ends of the inner sleeve assembly in sequence, without pressing them down. S3. Fix the buffer components one by one on the inner wall of the outer sleeve assembly, with the support of each buffer component facing the axis of the inner sleeve assembly. S4. Insert the assembled inner sleeve assembly coaxially into the outer sleeve assembly using a guide tool, so that the protruding end of the support lightly touches the outer wall of the inner sleeve assembly; fill the fire-expanding fireproof sealant from the two ends of the annular gap into the central area between the heat insulation rings and compact it until it is full to form a fireproof sealing section. S5. The clamping end cap is inserted from the outside of the inner sleeve assembly, so that its outer edge fits against the inner wall of the outer sleeve assembly, and the center hole fits against the outer wall of the inner sleeve assembly. The clamping end cap is pushed inward along the axial direction, so that its stepped annular pressure groove compresses each sealing ring until the clamping end cap is installed in place. Then the clamping end cap is fixedly connected to the end of the outer sleeve assembly to complete the sealing and clamping. S6. Embed the expansion strip into the second annular groove on the back of the flange, push the assembled sleeve into the pre-reserved hole in the wall, so that the flange fits against the wall surface, insert the expansion bolts and tighten them, and the expansion strip is pressed against the wall to form a waterproof interface. S7. Insert the pipeline to be installed into the inner sleeve assembly, fine-tune the pipeline position so that the anti-slip rubber ring adaptively grips the outer wall of the pipeline, conduct an airtightness or watertightness test, and mark the initial compression amount of the spring assembly on the surface of the compression end cap as a reference for subsequent maintenance.

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