Chimney heightening device for non-reinforced existing chimneys and method

Abstract

The application discloses a chimney heightening device and method for existing chimney without reinforcement, which comprises a heightened chimney, a sleeve structure and a support structure. The heightened chimney has opposite upper and lower ends along the height direction. The existing chimney has opposite upper and lower ends. The annular gap is formed between the lower end of the heightened chimney and the upper end of the existing chimney. The sleeve structure comprises an upper ring plate, a lower ring plate and a telescopic sealing element. The upper ring plate is connected to the lower end of the heightened chimney. The lower ring plate is connected to the upper end of the existing chimney. The sealing element is connected between the upper ring plate and the lower ring plate, which is used for sealing the annular gap and compensating the displacement of the heightened chimney. The support structure is used for bearing the vertical load and horizontal load of the heightened chimney. The chimney heightening device and method do not need to reinforce the existing chimney and foundation, which is simple in construction, low in cost and can improve the adaptability and structural safety of chimney heightening reconstruction.

Description

Technical Field

[0001] This invention relates to the field of chimney renovation technology, and in particular to a chimney heightening device and method for existing chimneys that do not require reinforcement. Background Technology

[0002] With increasingly stringent environmental emission requirements and the continuous expansion of industrial production, the emission height of many existing chimneys or exhaust stacks can no longer meet current environmental standards and production needs, necessitating the heightening and renovation of existing chimneys.

[0003] Currently, the conventional method for heightening chimneys is to directly add a steel chimney to the top of the existing chimney. However, this method significantly alters the dynamic characteristics of the chimney structure, leading to a sharp increase in the bending moment at the base of the chimney. This causes the overturning stability of the existing chimney foundation, the bearing capacity of the foundation anchors, the cross-sectional strength of the chimney, and the overall stability to all exceed limits significantly. Large-scale reinforcement and renovation of the existing chimney and foundation are required, which not only involves a large amount of reinforcement work and a long construction period but also significantly increases the renovation costs.

[0004] Existing technologies also include heightening solutions that involve adding towers to the sides, such as self-supporting steel chimney heightening structures. The heightened portion is directly rooted in the existing chimney, with the vertical load still borne by the existing chimney, and the newly added tower only sharing the lateral load. This solution still requires stress calculations for the existing chimney and foundation, and reinforcement may be necessary. Furthermore, the added tower expands the footprint of the original structure, limiting its applicability.

[0005] In summary, existing chimney heightening technologies generally suffer from problems such as the need to reinforce existing chimneys, complex construction, high costs, and increased land occupation.

[0006] Therefore, it is necessary to propose a chimney heightening device and method that does not require reinforcement of existing chimneys, in order to solve at least one of the above-mentioned problems.

[0007] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a chimney heightening device and method that eliminates the need for reinforcement of existing chimneys. This method is simple to construct, low in cost, and improves the adaptability and structural safety of chimney heightening retrofits.

[0009] The specific technical solution of the embodiments of the present invention is as follows: A chimney heightening device for existing chimneys without reinforcement is disclosed. The device comprises a heightened chimney, a sleeve structure, and a support structure. The heightened chimney is integrally positioned above the existing chimney. The heightened chimney has a heightened upper end and a heightened lower end along the height direction, and the existing chimney has an existing upper end and an existing lower end along the height direction. An annular gap is formed between the heightened lower end and the existing upper end. The heightened lower end and the existing upper end are connected by a non-load-bearing sliding seal through the sleeve structure. The heightened chimney can slide relative to the existing chimney within a predetermined range along the height direction. The sleeve structure includes an upper ring plate, a lower ring plate, and a retractable sealing element. The upper ring plate is connected to the heightened lower end, the lower ring plate is connected to the existing upper end, and the sealing element is connected between the upper and lower ring plates to seal the annular gap and compensate for the displacement of the heightened chimney. The support structure is used to bear all vertical and horizontal loads of the heightened chimney.

[0010] Furthermore, the inner diameter of the heightened chimney is larger than the outer diameter of the existing chimney, and the lower end of the heightened chimney is fitted onto the outside of the upper end of the existing chimney.

[0011] Furthermore, the upper ring plate is an annular steel plate, welded and fixed to the outer periphery of the raised lower end; the lower ring plate is an annular steel plate, welded and fixed to the outer periphery of the existing upper end.

[0012] Furthermore, the sealing element is a corrugated pipe, including an upper straight pipe section, a corrugated section, and a lower straight pipe section; the upper straight pipe section is connected to the upper ring plate and forms a first gap with the heightened chimney sidewall; the lower straight pipe section is connected to the lower ring plate and forms a second gap with the existing chimney sidewall.

[0013] Furthermore, the inner diameter of the heightened chimney is 8mm to 12mm larger than the outer diameter of the existing chimney. When the corrugated pipe is in its initial assembly state, the axial length of the sleeve section of the heightened lower end of the heightened chimney that is fitted over the existing upper end of the existing chimney is between 50mm and 80mm. An axial gap is formed between the bottom surface of the heightened lower end of the heightened chimney and the lower ring plate, and the axial gap is between 8mm and 12mm. The annular gap is between 4mm and 6mm, the first gap is between 8mm and 12mm, and the second gap is between 8mm and 12mm.

[0014] Furthermore, the supporting structure includes a tower, the height of which is greater than the height of the existing chimney. The tower includes a tower body, which includes multiple tower columns and tower supports. The multiple tower columns are spaced apart and surround the existing chimney and the heightened chimney. The tower supports are used to connect adjacent tower columns. The tower also includes at least one vertical support layer, which is disposed on the tower body and is used to bear the vertical load of the heightened chimney.

[0015] Furthermore, the vertical support layer is located at the intersection of the tower support and the tower column. The vertical support layer includes: a plurality of vertical support steel beams and vertical support brackets disposed between the vertical support steel beams and the heightened chimney. The vertical support brackets are evenly distributed along the circumferential interval of the heightened chimney.

[0016] Furthermore, the tower also includes at least one horizontal limiting layer, which is used to bear part of the horizontal load of the heightened chimney. The horizontal limiting layer is located at the intersection of the tower support and the tower column. The horizontal limiting layer includes multiple horizontal limiting steel beams and horizontal limiting supports installed on the horizontal limiting steel beams. The horizontal limiting supports are clearance-fitted with the heightened chimney.

[0017] Furthermore, the horizontal limiting layer and the vertical support layer are disposed above the existing chimney. The horizontal limiting layer includes an upper horizontal limiting layer and a lower horizontal limiting layer. The upper horizontal limiting layer is close to the upper end of the heightened chimney, and the lower horizontal limiting layer is close to the lower end of the heightened chimney. The vertical support layer is located between the upper horizontal limiting layer and the lower horizontal limiting layer.

[0018] A method for raising an existing chimney without reinforcement, used to manufacture a chimney raising device for any of the above-described existing chimneys without reinforcement, the method comprising: A support structure is installed around the existing chimney, and the support structure is independently installed on the existing chimney; The heightened chimney is connected to the existing chimney via a sleeve structure using a non-load-bearing sliding seal connection. The heightened chimney is installed on the supporting structure through a vertical support layer and a horizontal limiting layer, so that the supporting structure bears all the vertical and horizontal loads of the heightened chimney.

[0019] Furthermore, the step of connecting the heightened chimney to the existing chimney via a sleeve structure using a non-load-bearing sliding seal connection includes: A ring plate is welded at a predetermined position at the lower end of the heightened chimney; A lower ring plate is welded at a predetermined position at the existing upper end of the existing chimney; The heightened chimney is fitted around the existing chimney, with an axial gap reserved at the fitting position. The two ends of the corrugated pipe are welded to the upper ring plate and the lower ring plate, respectively.

[0020] The technical solution of the present invention has the following significant beneficial effects: The chimney heightening device for existing chimneys without reinforcement provided in this application embodiment achieves this by directly installing a sleeve structure between the heightened chimney and the existing chimney. This sleeve structure only provides gap sealing and vertical displacement compensation, without transmitting vertical forces to the existing chimney. All vertical and horizontal loads of the heightened chimney are independently borne by the supporting structure, allowing the heightened chimney to adaptively slide relative to the existing chimney within a predetermined range in the height direction. Thus, the overall structure prevents the vertical and horizontal loads of the heightened chimney from being transferred to the existing chimney, achieving structural force isolation between the two. This eliminates the need for reinforcement or modification of the existing chimney and foundation, while simultaneously ensuring sealing protection at the sleeve connection and adapting to vertical deformation and displacement. This reduces the amount of modification work and construction costs, and improves the adaptability and structural safety of chimney heightening modifications.

[0021] Specific embodiments of the invention are disclosed in detail below with reference to the description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the invention are not therefore limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0022] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0023] Figure 1 This is a plan view of an existing chimney. Figure 2 for Figure 1 Sectional view at point AA; Figure 3 This is a plan view of an existing chimney after being heightened using a chimney heightening device, as provided in the embodiments of this application. Figure 4 for Figure 3 Sectional view at point BB; Figure 5 for Figure 3 Sectional view at CC; Figure 6 for Figure 3 Sectional view at point DD; Figure 7 for Figure 3 Sectional view at EE; Figure 8 for Figure 3 Sectional view at FF; Figure 9 for Figure 4 Sectional view at point GG; Figure 10 for Figure 4 Sectional view at HH; Figure 11 This is a schematic diagram of the sleeve structure; Figure 12 for Figure 11 A magnified view of a section at point I; Figure 13 This is a diagram showing the relationship between the vertical support brackets and the heightened chimney; Figure 14 for Figure 13 A cross-sectional view at point JJ; Figure 15 This diagram shows the fit between the horizontal limit seat and the heightened chimney. Figure 16 for Figure 15 Sectional view at point KK; Figure 17 This is a flowchart illustrating the steps of a method for raising an existing chimney without reinforcement, as provided in the embodiments of this application.

[0024] The reference numerals in the above figures are as follows: 1. Existing chimney; 11. It has an upper part; 12. It has a lower end; 2. Increase the height of the chimney; 21. Raise the top height; 22. Raise the lower end; 3. Sleeve structure; 31. Upper ring plate; 32. Lower ring plate; 33. Sealing components; 331. Upper straight pipe section; 332. Lower straight pipe section; 333. Corrugated section; 4. Tower; 41. Tower pillars; 42. Tower support; 43. Horizontal limiting layer; 44. Vertical support layer; 45. Main beam; 46. ​​Secondary beam; 5. Horizontal limiting support; 6. Vertical support brackets. Detailed Implementation

[0025] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, all of which should be considered within the scope of the invention. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, they can refer to mechanical or electrical connections, or internal communication between two elements, and can be direct or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] This invention provides a chimney heightening device and method that eliminates the need for reinforcement of existing chimneys. It is simple to construct, low in cost, and can improve the adaptability and structural safety of chimney heightening and renovation.

[0028] Please refer to the following for comprehensive information. Figures 1 to 16 This application specification provides a chimney heightening device for existing chimneys that does not require reinforcement. This device may include: a heightened chimney 2, a sleeve structure 3, and a support structure. The heightened chimney 2 is integrally positioned above the existing chimney 1. Figure 4 As shown, the heightened chimney 2 has a heightened upper end 21 and a heightened lower end 22 along the height direction, as... Figure 2 As shown, the existing chimney 1 has an existing upper end 11 and an existing lower end 12 along the height direction. An annular gap is formed between the raised lower end 22 and the existing upper end 11. The raised lower end 22 and the existing upper end 11 are connected by a non-load-bearing sliding seal through the sleeve structure 3. The raised chimney 2 can slide relative to the existing chimney 1 within a predetermined range along the height direction. The sleeve structure 3 includes an upper ring plate 31, a lower ring plate 32, and a retractable sealing element 33. The upper ring plate 31 is connected to the raised lower end 22, the lower ring plate 32 is connected to the existing upper end 11, and the sealing element 33 is connected between the upper ring plate 31 and the lower ring plate 32 to seal the annular gap and compensate for the displacement of the raised chimney 2. The support structure is used to bear all the vertical and horizontal loads of the raised chimney 2.

[0029] The chimney heightening device for existing chimneys without reinforcement provided in this application embodiment uses a sleeve structure 3 directly between the heightened chimney 2 and the existing chimney 1. The sleeve structure 3 only achieves gap sealing and vertical displacement compensation, without transmitting vertical forces to the existing chimney 1. All vertical and horizontal loads of the heightened chimney 2 are independently borne by the supporting structure, allowing the heightened chimney 2 to adaptively slide relative to the existing chimney 1 within a predetermined range in the height direction. Thus, the overall structure prevents the vertical and horizontal loads of the heightened chimney 2 from being transmitted to the existing chimney 1, achieving structural force isolation between the two. This eliminates the need for reinforcement or modification of the existing chimney 1 and its foundation, while simultaneously ensuring sealing protection at the sleeve joint and adapting to vertical deformation and displacement, reducing the amount of modification work and construction costs, and improving the adaptability and structural safety of chimney heightening modifications.

[0030] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] In this embodiment, the lower end of the heightened chimney 2 and the existing upper end 11 of the existing chimney 1 can be interlocked, forming an overlapping interlocking section in the height direction. The heightened lower end 22 of the heightened chimney 2 can be interlocked with the existing upper end 11 of the existing chimney 1, or the heightened lower end 22 of the heightened chimney 2 can pass through the existing upper end 11 of the existing chimney 1.

[0032] In one embodiment, the inner diameter of the heightened chimney 2 is larger than the outer diameter of the existing chimney 1, and the heightened lower end 22 is fitted onto the outside of the existing upper end 11.

[0033] In this embodiment, the inner diameter of the heightened chimney 2 is larger than the outer diameter of the existing chimney 1, and the lower end 22 of the heightened chimney is coaxially fitted onto the outside of the existing upper end 11 from the outside. The fitting section between the existing chimney 1 and the heightened chimney 2 is designed with inner and outer coaxial fitting, which enables precise alignment and assembly of the heightened chimney 2 and the existing chimney 1, reserves reasonable radial space for the sliding seal, avoids eccentric installation causing seal wear and sliding jamming, and ensures the overall structural stability.

[0034] Please refer to the following: Figure 3 , Figure 4 , Figure 11 and Figure 12 In this embodiment, the sealing sleeve includes an upper ring plate 31, a lower ring plate 32, and a retractable sealing element 33.

[0035] The upper ring plate 31 can be an annular steel plate, which is welded and fixed to the outer periphery of the raised lower end 22; the lower ring plate 32 is an annular steel plate, which is welded and fixed to the outer periphery of the existing upper end 11.

[0036] By welding and fixing the annular steel plate around the entire periphery, a regular and coaxial mounting reference surface is provided for the retractable seal 33, ensuring that the seal 33 is uniformly stressed in the circumferential direction. The thickness of the annular steel plate can be determined according to design requirements, and this application does not impose a specific limitation. For example, the thickness of the annular steel plate can be 30 mm.

[0037] Since both the upper ring plate 31 and the lower ring plate 32 are made of ring plate steel plate structure, they have high rigidity and good coaxiality. The welding and fixing method is reliable and can effectively transmit the force at the end of the seal 33, avoid local stress concentration, and provide an installation benchmark for the sleeve gap and sealing assembly.

[0038] Furthermore, as shown in the figure, the sealing element 33 can be a corrugated pipe, including an upper straight pipe section 331, a corrugated section 333, and a lower straight pipe section 332; the upper straight pipe section 331 is connected to the upper ring plate 31 and forms a first gap with the side wall of the heightened chimney 2; the lower straight pipe section 332 is connected to the lower ring plate 32 and forms a second gap with the side wall of the existing chimney 1.

[0039] In this embodiment, the sealing element 33 can be in the form of a bellows, the parameters of which can be determined according to design requirements. For example, the bellows can be made of thin (e.g., about 5mm thick) stainless steel plate, making it easy to stretch and compress, thereby ensuring that the heightened chimney 2 and the existing chimney 1 can slide relative to each other in the longitudinal direction. The bellows can be made of a material with excellent corrosion resistance, such as stainless steel. Of course, the specific material and form of the bellows can also be other, and are not limited to the above description. Those skilled in the art may make other changes under the guidance of the technical essence of this application, but as long as the function and effect achieved are the same as or similar to those of this application, they should be covered within the scope of protection of this application.

[0040] The corrugated pipe comprises, along its height, an upper straight pipe section 331, a corrugated section 333, and a lower straight pipe section 332. Utilizing the expansion and contraction characteristics of the corrugated section 333 to accommodate vertical displacement, the upper straight pipe section 331 and the lower straight pipe section 332 are only connected to their corresponding annular plates and do not adhere to the sidewalls of the chimneys (the heightened chimney 2 and the existing chimney 1). Vertical relative sliding between the heightened chimney 2 and the existing chimney 1 is achieved without interference thanks to the pre-reserved gap.

[0041] Overall, the corrugated pipe has both sealing and axial expansion and contraction compensation capabilities. The reserved gap on the side wall can avoid structural interference caused by the thermal expansion and contraction of the chimney and vertical settlement, ensuring smooth sliding while maintaining circumferential sealing performance and preventing flue gas from overflowing and rainwater from seeping into the joint gap.

[0042] In one specific embodiment, the inner diameter of the heightened chimney 2 is 8mm to 12mm larger than the outer diameter of the existing chimney 1. When the corrugated pipe is in its initial assembly state, the axial length of the sleeve section of the heightened lower end 22 of the heightened chimney 2, which is fitted over the existing upper end 11 of the existing chimney 1, is between 50mm and 80mm. An axial gap is formed between the bottom surface of the heightened lower end 22 of the heightened chimney 2 and the lower ring plate 32, and the axial gap is between 8mm and 12mm. The annular gap is between 4mm and 6mm, the first gap is between 8mm and 12mm, and the second gap is between 8mm and 12mm.

[0043] In this embodiment, by matching the multi-dimensional gaps and assembly dimensions, after the bellows is initially assembled and in place, reasonable deformation and movement allowance are reserved for the vertical sliding of the heightened chimney 2 relative to the existing chimney 1, the expansion and contraction deformation of the bellows, and the circumferential sealing. The dimensions cooperate with each other to form a coaxial sliding sealing system.

[0044] Overall, by optimizing the various fitting clearances and assembly dimensions, it avoids both excessively small clearances that cause sliding jamming and restricted deformation, and excessively large clearances that lead to sealing failure, shaking, and skewing. It precisely matches the expansion and contraction characteristics of the corrugated pipe with the vertical displacement requirements of the chimney, thereby simultaneously improving structural adaptability, sealing reliability, and long-term operational stability.

[0045] In this embodiment, the inner diameter difference, sleeve length, axial clearance, annular clearance, and clearance on both sides of the bellows are precisely matched between the heightened chimney 2 and the existing chimney 1. This multi-clearance collaborative design avoids both excessively small clearances that cause sliding jamming and limited bellows deformation, and excessively large clearances that cause sealing failure and swaying or tilting of the heightened chimney 2. It achieves a balance between sealing reliability, sliding freedom, and structural stability, and solves the technical contradiction that conventional rigid seals cannot slide and flexible seals are prone to air and rain leakage.

[0046] Please refer to the following: Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 In one embodiment, the supporting structure includes a tower 4, the height of which is greater than the height of the existing chimney 1. The tower 4 includes a tower 4 body, which includes a plurality of tower columns 41 and tower supports 42. The plurality of tower columns 41 are spaced apart and surround the periphery of the existing chimney 1 and the heightened chimney 2. The tower supports 42 are used to connect two adjacent tower columns 41. The tower 4 also includes at least one vertical support layer 44, which is disposed on the tower 4 body and is used to bear the vertical load of the heightened chimney 2.

[0047] In this embodiment, the support structure can be in the form of a tower 4. However, the support structure is not limited to the tower 4 structure; other support forms capable of independently bearing all vertical and horizontal loads of the heightened chimney 2 without transmitting forces to the existing chimney 1 can also be used. For example, the support structure can also be a combination of multiple independent vertical columns and horizontal connecting rods, a cable-stayed support system, a ground-mounted frame truss support system, or a lateral cantilever support system relying on surrounding buildings and structures.

[0048] Overall, the tower 4 or other support structure can be set up independently of the existing chimney 1, forming a self-supporting system that can fully bear the vertical and horizontal loads of the heightened chimney 2, blocking the load transfer path from the heightened chimney 2 to the existing chimney 1. At the same time, vertical support layers 44 and horizontal limiting layers 43 can be arranged on the support structure to meet the vertical support and horizontal limiting requirements of the heightened chimney 2. All of these can achieve the invention purpose of not needing to reinforce the existing chimney 1 and being suitable for the vertical sliding and sealing of the heightened chimney 2.

[0049] In this embodiment, the example is mainly illustrated by the form of a tower 4. The tower 4 is independently erected on the outside of the chimney to form an integral load-bearing frame. The vertical support layer 44 forms a load-bearing point through the tower 4 body, transferring all the vertical load of the heightened chimney 2 to the ground through the tower 4, and completely isolating it from the existing chimney 1 in terms of load.

[0050] The tower 4 forms a frame structure through tower columns 41 and tower supports 42. It has high overall rigidity and strong load-bearing capacity. It is independently deployed on the periphery and is not erected on the existing chimney 1. It can realize the vertical load of the heightened chimney 2 to be moved outward, thus eliminating the need for reinforcement of the existing chimney 1 and foundation from a structural point of view. It is suitable for chimney heightening and renovation of different heights and specifications.

[0051] like Figure 9 , Figure 13 and Figure 14 As shown, the vertical support layer 44 is further disposed at the intersection of the tower support 42 and the tower column 41. The vertical support layer 44 may include: a plurality of vertical support steel beams and vertical support supports 6 disposed between the vertical support steel beams and the heightened chimney 2. The vertical support supports 6 are evenly distributed along the circumferential interval of the heightened chimney 2.

[0052] In this embodiment, taking advantage of the structural characteristics of high structural stiffness and direct force transmission path at the intersection of tower support 42 and tower column 41, the vertical support layer 44 is arranged at this node position. This allows the vertical load of the heightened chimney 2 to be transmitted to the vertical support steel beam via the circumferentially distributed vertical support supports 6, and then to the tower column 41 and tower support 42, forming a continuous and smooth force transmission path from top to bottom. In addition, placing the vertical support layer 44 at the stress node position of the tower 4 can effectively reduce the additional bending moment and local stress concentration of the tower 4 members, making the structural stress more reliable.

[0053] The vertical support 6, which is evenly distributed around the perimeter, provides balanced support for the heightened chimney 2 at multiple points, avoiding concentrated stress at a single point. Furthermore, the evenly distributed support layout can prevent local overload from causing deformation of the chimney body or local damage to the tower 4, thereby improving the overall structural load-bearing stability and durability.

[0054] In addition, the layout of the vertical support layer 44 facilitates on-site positioning, installation, and stress verification, effectively reducing the difficulty of construction and assembly.

[0055] like Figure 10 , Figure 15 and Figure 16 As shown, the vertical support layer 44 includes several main beams 45, secondary beams 46, and vertical support brackets 6.

[0056] For example, for a single vertical support layer 44, the main beam 45 may include four beams forming a roughly square frame. A secondary beam 46 is located at the corner of every two adjacent main beams 45, thus the single vertical support layer 44 includes four secondary beams 46. The vertical support supports 6 may be located at the center of the main beams 45 and the center of the secondary beams 46, respectively. The number of vertical support supports 6 can be the sum of the number of main beams 45 and secondary beams 46, for example, eight. Both the main beams 45 and the secondary beams 46 can be steel beams.

[0057] The vertical support 6 may include several steel plates and / or structural steel. The vertical support 6 may be welded to the heightened chimney 2 and the main beam 45 or the secondary beam 46 respectively, thereby welding and fixing the heightened chimney 2 to the main beam 45 or the secondary beam 46.

[0058] In one embodiment, the tower 4 further includes at least one horizontal limiting layer 43, which is used to bear part of the horizontal load of the heightened chimney 2. The horizontal limiting layer 43 is located at the intersection of the tower support 42 and the tower column 41. The horizontal limiting layer 43 includes a plurality of horizontal limiting steel beams and horizontal limiting supports 5 disposed on the horizontal limiting steel beams. The horizontal limiting supports 5 are clearance-fitted with the heightened chimney 2.

[0059] In this embodiment, the technical effect of the horizontal limiting layer 43 being disposed at the intersection of the tower support 42 and the tower column 41 can be referred to the technical effect of the vertical support layer 44 being disposed at the intersection of the tower support 42 and the tower column 41, and will not be repeated here.

[0060] In this embodiment, the horizontal limit support 5 and the heightened chimney 2 are fitted with a gap to restrict the horizontal displacement and torsional sway of the heightened chimney 2, while sharing the horizontal forces such as wind loads, allowing the chimney to slide normally and without restraint. This can effectively resist the horizontal displacement and sway caused by wind loads and lateral disturbances, and improve the overall lateral stiffness and stability of the heightened chimney 2. In addition, the gap fit does not restrict vertical displacement, taking into account both the requirements of horizontal limitation and vertical free sliding.

[0061] The horizontal limiting layer 43 includes several main beams 45, secondary beams 46, and horizontal limiting supports 5.

[0062] For example, for a horizontal limiting layer 43, the main beam 45 may include four beams forming a roughly square frame. A secondary beam 46 is located at the corner of each pair of adjacent main beams 45. For a vertical support layer 44, it includes four secondary beams 46. The horizontal limiting supports 5 may be located at the center of the main beams 45 and the center of the secondary beams 46. The number of horizontal limiting supports 5 can be the sum of the number of main beams 45 and secondary beams 46, for example, eight. Both the main beams 45 and the secondary beams 46 can be steel beams.

[0063] like Figure 15 and Figure 16 As shown, the horizontal limiting support 5 may include several steel plates and / or structural steel sections. These steel plates may be pre-installed on the steel beam, forming a predetermined gap between the horizontal limiting support 5 and the heightened chimney 2. Specifically, this predetermined gap may be a small gap of less than 5 mm, for example, approximately 2 mm.

[0064] Furthermore, in the embodiment where both the vertical support layer 44 and the horizontal limiting layer 43 are located at the intersection of the tower support 42 and the tower column 41, the included angle between the tower support 42 and the tower column 41 can be 45°. This arrangement can fully utilize the structural mechanical characteristics of the tower intersection node, which has the greatest stiffness, the shortest force transmission path, and the least stress concentration, making the overall stress of the tower 4 most reasonable, the material utilization rate highest, and the structural reliability strongest; the 45° included angle is the optimal angle in structural mechanics, which can maximize the distribution of vertical and horizontal loads, minimize the bending moment and stress of the tower 4 members, and improve the overall wind and earthquake resistance performance.

[0065] like Figure 4 As shown, in one specific embodiment, the horizontal limiting layer 43 and the vertical support layer 44 are disposed above the existing chimney 1. The horizontal limiting layer 43 includes an upper horizontal limiting layer 43 and a lower horizontal limiting layer 43. The upper horizontal limiting layer 43 is close to the upper end 21 of the heightened chimney 2, and the lower horizontal limiting layer 43 is close to the lower end 22 of the heightened chimney 2. The vertical support layer 44 is located between the upper horizontal limiting layer 43 and the lower horizontal limiting layer 43.

[0066] In this embodiment, a layered layout of upper and lower horizontal limiting layers 43 is adopted to provide upper and lower horizontal constraints and middle vertical load-bearing, forming a three-dimensional force-bearing system with upper and lower constraints and middle load-bearing. The above-mentioned layered arrangement can comprehensively constrain the horizontal displacement and torsion of the heightened chimney 2, and the vertical support layer 44 is centrally located and has a reasonable force-bearing path, further improving the overall structural stability and wind and earthquake resistance of the heightened chimney 2.

[0067] Overall, in this embodiment, a non-load-bearing sliding seal is achieved through the sleeve structure 3, combined with a multi-dimensional precise gap design, ensuring a leak-proof seal while allowing the heightened chimney 2 to slide freely vertically without transmitting any vertical force. Simultaneously, an independent tower system 4 is employed, with the vertical support layer 44 and the horizontal limiting layer 43 both positioned at the nodes with the highest tower stiffness. Furthermore, the angle between the tower support 42 and the tower column 41 is 45°, forming an optimal arrangement. This ensures that all vertical and horizontal loads of the heightened chimney 2 are transferred outwards, completely preventing transmission to the existing chimney 1 and its foundation. This application overcomes the technical bottlenecks of conventional chimney heightening methods, which require reinforcing the existing chimney, where sealing and sliding are mutually exclusive, and where tower stress is unreasonable. It eliminates the need for reinforcement of the existing chimney 1, simplifies construction, and reduces costs.

[0068] Please refer to the following: Figure 17 This application also provides a method for raising an existing chimney 1 that does not require reinforcement, used to manufacture a chimney raising device for any of the above-described existing chimneys that does not require reinforcement. The method for raising an existing chimney 1 that does not require reinforcement may include the following steps: Step S10: Install a support structure around the existing chimney 1, wherein the support structure is independently installed on the existing chimney 1; Step S12: The heightened chimney 2 is connected to the existing chimney 1 in a non-load-bearing sliding seal connection through the sleeve structure 3; Step S14: Install the heightened chimney 2 onto the support structure through the vertical support layer 44 and the horizontal limiting layer 43, so that the support structure can bear all the vertical and horizontal loads of the heightened chimney 2.

[0069] In step S12, the non-load-bearing sliding seal connection between the heightened chimney 2 and the existing chimney 1 via the sleeve structure 3 includes: A ring plate 31 is welded at a predetermined position at the lower end 22 of the heightened chimney 2; A lower ring plate 32 is welded at a predetermined position on the existing upper end 11 of the existing chimney 1; The heightened chimney 2 is fitted around the existing chimney 1, with an axial gap reserved at the fitting position. The two ends of the corrugated pipe are welded to the upper ring plate 31 and the lower ring plate 32, respectively.

[0070] In this embodiment, the step-by-step process of first fixing the ring plate, then aligning the sleeve, and finally welding the sealing element 33 accurately controls the assembly gap and coaxiality, ensuring the assembly accuracy of the non-load-bearing sliding seal of the sleeve structure 3. This helps to avoid sealing failure and sliding jamming caused by on-site assembly deviations, and ensures the stable and reliable sealing performance and vertical sliding function of the sleeve structure 3.

[0071] Overall, the chimney heightening method for existing chimney 1 without reinforcement provided in this application can block the load transfer path from the heightened chimney 2 to the existing chimney 1 while carrying out the chimney heightening operation. It eliminates the need to carry out reinforcement and renovation work on the existing chimney 1 and its foundation, saving the complicated procedures of existing structure testing, assessment, stress calculation and reinforcement and renovation. This effectively reduces the investment cost of engineering renovation and greatly reduces the difficulty of on-site construction.

[0072] Meanwhile, when this application is implemented, only the supporting structure and the main components of the heightened chimney 2 need to be added. Most of the components can be prefabricated in the factory and assembled on site, which greatly reduces the amount of on-site wet work and cast-in-place construction, and significantly reduces the amount of on-site construction work. Furthermore, standardized factory prefabrication is conducive to controlling the processing accuracy and forming quality of components, and the on-site assembly process is simple and controllable, which can effectively improve the component manufacturing accuracy and the overall on-site construction quality, shorten the construction cycle, and adapt to various existing chimney 1 heightening and renovation application scenarios.

[0073] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from the others. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be included within the scope of protection of the present invention.

Claims

1. A chimney heightening device for existing chimneys that does not require reinforcement, characterized in that, The chimney heightening device includes: a heightened chimney, a sleeve structure, and a support structure. The heightened chimney is integrally positioned above the existing chimney. The heightened chimney has a heightened upper end and a heightened lower end along the height direction. The existing chimney has an existing upper end and an existing lower end along the height direction. An annular gap is formed between the heightened lower end and the existing upper end. The heightened lower end and the existing upper end are connected by a sleeve structure to achieve a non-load-bearing sliding seal. The heightened chimney can slide relative to the existing chimney within a predetermined range along the height direction. The sleeve structure includes an upper ring plate, a lower ring plate, and a retractable seal. The upper ring plate is connected to the lower end of the heightened chimney, the lower ring plate is connected to the existing upper end, and the seal is connected between the upper ring plate and the lower ring plate to seal the annular gap and compensate for the displacement of the heightened chimney. The supporting structure is used to bear all the vertical and horizontal loads of the heightened chimney.

2. The chimney heightening device for existing chimneys without reinforcement as described in claim 1, characterized in that, The inner diameter of the heightened chimney is larger than the outer diameter of the existing chimney, and the lower end of the heightened chimney is fitted onto the outside of the upper end of the existing chimney.

3. The chimney heightening device for existing chimneys without reinforcement as described in claim 2, characterized in that, The upper ring plate is a ring-shaped steel plate, which is welded and fixed to the outer periphery of the raised lower end; the lower ring plate is a ring-shaped steel plate, which is welded and fixed to the outer periphery of the existing upper end.

4. The chimney heightening device for existing chimneys without reinforcement as described in claim 3, characterized in that, The sealing element is a corrugated pipe, including an upper straight pipe section, a corrugated section, and a lower straight pipe section; the upper straight pipe section is connected to the upper ring plate and forms a first gap with the side wall of the heightened chimney; the lower straight pipe section is connected to the lower ring plate and forms a second gap with the side wall of the existing chimney.

5. The chimney heightening device for existing chimneys without reinforcement as described in claim 4, characterized in that, The inner diameter of the heightened chimney is 8mm to 12mm larger than the outer diameter of the existing chimney. When the corrugated pipe is in its initial assembly state, the axial length of the sleeve section of the heightened lower end of the heightened chimney that is fitted over the existing upper end of the existing chimney is between 50mm and 80mm. An axial gap is formed between the bottom surface of the heightened lower end of the heightened chimney and the lower ring plate, and the axial gap is between 8mm and 12mm. The annular gap is between 4mm and 6mm, the first gap is between 8mm and 12mm, and the second gap is between 8mm and 12mm.

6. The chimney heightening device for existing chimneys without reinforcement as described in claim 1, characterized in that, The supporting structure includes a tower, the height of which is higher than that of the existing chimney. The tower includes a tower body, the tower body includes multiple tower columns and tower supports. The multiple tower columns are spaced apart and surround the existing chimney and the heightened chimney. The tower supports are used to connect two adjacent tower columns. The tower also includes at least one vertical support layer, which is disposed on the tower body and is used to bear the vertical load of the heightened chimney.

7. The chimney heightening device for existing chimneys without reinforcement as described in claim 6, characterized in that, The vertical support layer is located at the intersection of the tower support and the tower column. The vertical support layer includes: multiple vertical support steel beams and vertical support brackets disposed between the vertical support steel beams and the heightened chimney. The vertical support brackets are evenly distributed along the circumferential interval of the heightened chimney.

8. The chimney heightening device for existing chimneys without reinforcement as described in claim 6, characterized in that, The tower also includes at least one horizontal limiting layer, which is used to bear part of the horizontal load of the heightened chimney. The horizontal limiting layer is located at the intersection of the tower support and the tower column. The horizontal limiting layer includes multiple horizontal limiting steel beams and horizontal limiting supports installed on the horizontal limiting steel beams. The horizontal limiting supports are clearance-fitted with the heightened chimney.

9. The chimney heightening device for existing chimneys without reinforcement as described in claim 8, characterized in that, The horizontal limiting layer and the vertical support layer are disposed above the existing chimney. The horizontal limiting layer includes an upper horizontal limiting layer and a lower horizontal limiting layer. The upper horizontal limiting layer is close to the upper end of the heightened chimney, and the lower horizontal limiting layer is close to the lower end of the heightened chimney. The vertical support layer is located between the upper horizontal limiting layer and the lower horizontal limiting layer.

10. A method for raising an existing chimney without reinforcement, used to manufacture a chimney raising device for any one of claims 1 to 9, characterized in that, The method for increasing the height of existing chimneys without reinforcement includes: A support structure is installed around the existing chimney, and the support structure is independently installed on the existing chimney; The heightened chimney is connected to the existing chimney via a sleeve structure using a non-load-bearing sliding seal connection. The heightened chimney is installed on the supporting structure through a vertical support layer and a horizontal limiting layer, so that the supporting structure bears all the vertical and horizontal loads of the heightened chimney.

11. The method for increasing the height of an existing chimney without reinforcement as described in claim 10, characterized in that, The step of connecting the heightened chimney to the existing chimney via a sleeve structure through a non-load-bearing sliding seal includes: A ring plate is welded at a predetermined position at the lower end of the heightened chimney; A lower ring plate is welded at a predetermined position at the existing upper end of the existing chimney; The heightened chimney is fitted around the existing chimney, with an axial gap reserved at the fitting position. The two ends of the corrugated pipe are welded to the upper ring plate and the lower ring plate, respectively.

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