A single-tube anti-corrosion chimney and construction method

Abstract

The present invention provides a single-cylinder anti-corrosion chimney, comprising a concrete support section and a steel structure cylinder section arranged from bottom to top; the inner wall of the steel structure cylinder section is provided with an anti-corrosion layer 1, the top of the concrete support section is provided with an ash accumulation platform connected to the anti-corrosion layer 1, the ash accumulation platform is provided with a mortar collection pit, and the bottom of the mortar collection pit is connected to the mortar collection pool inside the concrete support section through a mortar discharge pipe. The present invention also provides a construction method for a single-cylinder anti-corrosion chimney, including the steps of pouring a concrete construction section, laying a mortar discharge pipe and a mortar collection pool, preparing an annular corbel and an inspection platform by cast-in-place construction, pouring a conversion transition cylinder section, and installing a steel exhaust pipe section. The present invention combines the lower concrete support section and the upper steel structure cylinder section, which can give full play to the mechanical properties of the concrete structure and the steel structure. The steel structure cylinder section does not need to be additionally provided with a complex support structure, the construction process is simple, and the construction period is short.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas emission, and in particular to a single-tube anti-corrosion chimney and a construction method thereof. Background Art

[0002] The flue gas generated in industrial production contains a large amount of corrosive substances. Although the flue gas has undergone dust removal, denitrification and desulfurization treatment, the corrosive substances cannot be completely eliminated and will enter the chimney, which is the flue gas emission terminal, in the form of gas or atomized liquid, and will cause varying degrees of corrosion to the chimney wall.

[0003] After decades of technological development and engineering experience accumulation, my country has formed a variety of corrosion-resistant chimney types. Among them, according to the support method of steel exhaust pipes, there are mainly three types of chimneys: self-supporting steel chimneys, concrete outer tube support + steel inner tube sleeve chimneys, and steel tower support steel chimneys.

[0004] However, the application height of self-supporting steel chimneys is limited. It is generally believed that self-supporting steel chimneys are not economical and safe when the height exceeds 100m. The concrete outer tube support + steel inner tube sleeve chimney has a wide application height range, generally 80m to 260m, but the construction process is complicated, the construction period is long, and the construction cost is high. The steel tower support + steel chimney tube form has an application height range of generally 60m to 160m, but it also has the problems of complex construction process and high construction cost.

[0005] In summary, there is an urgent need for a single-tube anti-corrosion chimney and a construction method to solve the problems existing in the prior art. Summary of the invention

[0006] The present invention aims to provide a single-tube anti-corrosion chimney and a construction method thereof, so as to solve the problems of complicated construction process and high construction cost of the existing chimney.

[0007] To achieve the above-mentioned objectives, the present invention provides a single-cylinder corrosion-resistant chimney, comprising a concrete support section and a steel structure cylinder section arranged from bottom to top; the inner wall of the steel structure cylinder section is provided with an anti-corrosion layer 1, and the top of the concrete support section is provided with an ash accumulation platform connected to the anti-corrosion layer 1, and a mortar collection pit is provided on the ash accumulation platform, and the bottom of the mortar collection pit is connected to the mortar collection pool inside the concrete support section through a mortar discharge pipe.

[0008] Preferably, a guide pad layer is provided at the periphery of the mortar collection pit, and the slope of the guide pad layer is 5% to 10%; and an anti-corrosion layer 2 is provided on the upper surfaces of the mortar collection pit and the guide pad layer.

[0009] Preferably, an annular corbel and an inspection platform placed on the annular corbel are provided inside the concrete support section; the inspection platform is located below the dust accumulation platform, an inspection manhole pipe is provided on the dust accumulation platform, and a cover plate is provided on the inspection manhole pipe; a water stop ring for sealing is provided on the outer peripheral surface of the inspection manhole pipe.

[0010] Preferably, the maintenance platform comprises a prefabricated beam frame layer, a corrugated steel plate formwork layer and a reinforced concrete layer arranged from bottom to top, and the prefabricated beam frame layer is placed on the top of the annular corbel.

[0011] Preferably, a mortar discharge pipe passage hole is provided on the inspection platform; the mortar discharge pipe includes a first discharge pipe section and a second discharge pipe section, the starting end of the first discharge pipe section is connected to the mortar collection pit, and the starting end of the second discharge pipe section is provided with an open portion arranged opposite to the end of the first discharge pipe section; a plurality of embedded connectors for fixing the mortar discharge pipe are provided inside the concrete support section.

[0012] Preferably, the concrete support section includes a chimney foundation section, a concrete cylinder section and a conversion transition cylinder section arranged from bottom to top; the concrete cylinder section is a frustum structure which is small at the top and large at the bottom, the cylinder side wall slope of the concrete cylinder section is 3% to 8%, and the cylinder side wall thickness is 240mm to 450mm; the annular corbel is arranged inside the conversion transition cylinder section, the dust accumulation platform is arranged at the top of the conversion transition cylinder section, and the wall thickness of the conversion transition cylinder section increases from bottom to top.

[0013] Preferably, the steel structure cylinder section includes several sections of detachably connected steel smoke exhaust pipe sections; the steel smoke exhaust pipe sections include an external substrate layer and annular stiffening ribs arranged on the outer peripheral surface of the external substrate layer; the anti-corrosion layer one is arranged on the inner wall of the external substrate layer, and the material of the anti-corrosion layer one is one of titanium steel plate, stainless steel plate or acid-resistant brick.

[0014] Preferably, the outer peripheral surface of the steel structure cylinder section is provided with a steel platform, a chimney manhole, a wind breaking ring and a ladder.

[0015] Preferably, the steel structure cylinder section and the concrete support section are connected by a through-bolt assembly, and a sealing grouting layer is filled between the steel structure cylinder section and the concrete support section.

[0016] The present application also provides a construction method of a single-tube anti-corrosion chimney, which is used to manufacture the above-mentioned single-tube anti-corrosion chimney, comprising the following steps:

[0017] Step 1: Cast the chimney foundation section of the concrete support section, then cast the concrete cylinder section in sections, and lay out the mortar discharge pipe and mortar collection pool;

[0018] Step 2: Prepare the circular corbel by cast-in-place construction inside the concrete cylinder section. After the concrete strength of the circular corbel is ≥70%, hoist the precast beam frame layer of the maintenance platform onto the circular corbel, horizontally lay the corrugated steel plate formwork layer on the precast beam frame layer and cast the reinforced concrete layer;

[0019] Step 3: After the concrete strength of the reinforced concrete layer of the maintenance platform is ≥70%, the casting of the transition cylinder section is completed;

[0020] Step 4: Install the first section of steel smoke exhaust pipe section to the upper part of the concrete support section, pour the ash accumulation platform on the top of the transition cylinder section, and complete the setting of the second anti-corrosion layer; then install several sections of steel smoke exhaust pipe section in sequence on top of the first section of steel smoke exhaust pipe section to form a steel structure cylinder section.

[0021] The application of the technical solution of the present invention has the following beneficial effects:

[0022] (1) In the present invention, by combining the lower concrete support section and the upper steel structure cylinder section, the mechanical properties of the concrete structure and the steel structure can be brought into play. The steel structure cylinder section used for smoke exhaust does not need to be additionally provided with a complex support structure, the construction process is simple, and the construction period is short, so that the height of the single-cylinder corrosion-resistant chimney of the present application can reach 60m to 160m, and the application range is wide. Compared with the chimney form of concrete outer cylinder + steel inner cylinder in the prior art, the construction process is simpler; an anti-corrosion layer is provided on the inner wall of the steel structure cylinder section, which can prevent the inner wall of the steel structure cylinder section from being corroded when the smoke is discharged, which is beneficial to improving the service life of the steel structure cylinder section; a mortar collection pit is provided on the dust accumulation platform, and the bottom of the mortar collection pit is connected to the mortar collection pool inside the concrete support section through a mortar discharge pipe, which is used to collect dust and mortar in the smoke.

[0023] (2) In the present invention, an inclined guide pad is arranged on the periphery of the slurry collection pit, so as to facilitate the diversion of the slurry into the slurry collection pit. The upper surfaces of the slurry collection pit and the guide pad are provided with an anti-corrosion layer 2 to enhance the corrosion resistance of the internal structure of the chimney of the present application.

[0024] (3) In the present invention, the maintenance platform is located below the dust accumulation platform and is used to inspect the connection status between the bottom of the dust accumulation platform and the slurry discharge pipe, the connection status of the slurry discharge pipe itself, etc.

[0025] (4) In the present invention, the starting end of the second discharge pipe section of the slurry discharge pipe is provided with an open portion arranged opposite to the end of the first discharge pipe section, so that the end of the first discharge pipe section can extend into the open portion, thereby preventing the slurry from leaking out and releasing the temperature stress generated by the flue gas temperature at the end of the first discharge pipe section.

[0026] (5) In the present invention, the wall thickness of the transition cylinder section increases from bottom to top, so that the vertical cross-section of the side wall of the transition cylinder section is a trapezoidal shape with a thin bottom and a thick top. Since the top of the transition cylinder section needs to support the steel structure cylinder section, it needs to withstand greater pressure. Gradually increasing the top wall thickness of the transition cylinder section along the height direction is beneficial to improving the stress condition of the transition cylinder section.

[0027] (6) In the present invention, the steel structure cylinder section includes a plurality of detachably connected steel smoke exhaust pipe sections, which facilitates the construction process and can shorten the construction period of the chimney.

[0028] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 This is a schematic structural diagram of a single-tube anti-corrosion chimney in an embodiment of the present application;

[0031] Figure 2 This is an embodiment of the present application Figure 1 Schematic diagram of the local structure;

[0032] Figure 3 This is an embodiment of the present application Figure 2 Schematic diagram of the local structure;

[0033] Figure 4 It is a partial cross-sectional view of a single-tube anti-corrosion chimney in an embodiment of the present application;

[0034] Figure 5 is a bottom cross-sectional view of a single-tube anti-corrosion chimney in an embodiment of the present application;

[0035] Figure 6 This is an embodiment of the present application Figure 4 A magnified view of the details of part A;

[0036] Figure 7 In the embodiment of this application Figure 1 A top view of

[0037] Figure 8 is a partial cross-sectional view of a mortar discharge pipe in an embodiment of the present application;

[0038] Fig. 9 is a schematic diagram of the connection between the embedded connector and the mortar discharge pipe in the embodiment of the present application;

[0039] Among them, 1. Concrete support section, 1.1. Ash accumulation platform, 1.1.1. Mortar collection pit, 1.1.2. Diversion cushion layer, 1.1.3. Anti-corrosion layer 2, 1.1.4. Inspection manhole pipe, 1.1.5. Cover plate, 1.1.6. Water stop ring, 1.2. Annular corbel, 1.3. Inspection platform, 1.3.1. Precast beam frame layer, 1.3.2. Corrugated steel plate formwork layer, 1.3.3. Reinforced concrete layer, 1.3.4. Mortar discharge pipe through hole, 1.4. Embedded connectors, 1.4.1. Embedded parts, 1.4.2. Steel support parts, 1.4.3. U-shaped clamp, 1.5. Chimney foundation section, 1.6. Concrete cylinder section, 1.7. Transformer Transition cylinder section, 1.7.1, conversion platform, 1.7.2, cross-linked anchor bolt sleeve, 2, steel structure cylinder section, 2.1, anti-corrosion layer one, 2.2, steel smoke exhaust pipe section, 2.2.1, external base material layer, 2.2.2, annular stiffening rib, 2.2.3, flange, 2.2.4, annular stiff flange, 2.3, steel platform, 2.3.1, steel guardrail, 2.4, chimney manhole, 2.5, wind breaking ring, 2.6, spiral steel ladder, 2.7, straight steel ladder, 3, mortar discharge pipe, 3.1, first discharge pipe section, 3.2, second discharge pipe section, 3.2.1, open part, 3.2.2, mortar discharge pipe section, 4, mortar collection tank, 5, cross-linked bolt assembly. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0041] Example:

[0042] See also Figures 1 to 9 , a single-tube corrosion-resistant chimney and a construction method, this embodiment is applied to the emission of factory flue gas.

[0043] A single-tube anti-corrosion chimney, see Figure 1 , including a concrete support section 1 and a steel structure cylinder section 2 arranged from bottom to top. Through the combination of the concrete support section 1 and the steel structure cylinder section 2, the mechanical properties of the concrete structure and the steel structure can be brought into play, so that the height of the single-cylinder anti-corrosion chimney of the present application can reach 60m to 160m, and the application range is wide; the inner wall of the steel structure cylinder section 2 is provided with an anti-corrosion layer 2.1, such as Figure 6 As shown, it can avoid the corrosion of the inner wall of the steel structure cylinder section 2 when the smoke is discharged, which is beneficial to prolonging the service life of the steel structure cylinder section 2; see Figure 4The top of the concrete support section 1 is provided with a dust accumulation platform 1.1 connected to the anti-corrosion layer 1.1, and a mortar collection pit 1.1.1 is provided on the dust accumulation platform 1.1. The bottom of the mortar collection pit 1.1.1 is connected to the mortar collection pool 4 inside the concrete support section 1 through a mortar discharge pipe 3. Figure 5 As shown, it is used to collect dust and slurry in the flue gas.

[0044] In this embodiment, the slurry collection pit 1.1.1 is formed by the middle beam of the ash accumulation platform 1.1. Figure 7 As shown, the plane dimensions are 1100mm (length) × 1100mm (width), and the maximum structural depth is 300mm~800mm; the mortar collection pool 4 is a reinforced concrete rectangular pool with a clearance of 3m (length) × 3m (width) × 2.5m (depth), a pool wall thickness of 300mm, and a pool bottom thickness of 350mm. The inner surfaces of the pool wall and the bottom of the mortar collection pool 4 are coated with a corrosion-resistant modified polyvinyl chloride (HFVC) coating structure. The total thickness of the coating structure is 5mm, which is used to realize the anti-corrosion function of the mortar collection pool 4. The top elevation of the mortar collection pool 4 is 300mm higher than the floor area inside the chimney.

[0045] See also Figure 4 The outer periphery of the mortar collection pit 1.1.1 is provided with a guide pad 1.1.2, which is inclined downward, and the slope of the guide pad 1.1.2 is 5% to 10%, which is convenient for guiding the mortar into the mortar collection pit 1.1.1; in this embodiment, the guide pad 1.1.2 is a plain concrete pad with a thickness of not less than 50mm; the upper surfaces of the mortar collection pit 1.1.1 and the guide pad 1.1.2 are both provided with an anti-corrosion layer 1.1.3, such as Figure 6 As shown, it is used to enhance the corrosion resistance of the internal structure of the chimney of this application.

[0046] See also Figure 4 , the concrete support section 1 is provided with an annular corbel 1.2 and an inspection platform 1.3 placed on the annular corbel 1.2. The annular corbel 1.2 is a cast-in-place reinforced concrete structure connected to the inner wall of the concrete support section 1; the inspection platform 1.3 is located below the dust accumulation platform 1.1 and is used to inspect the connection status between the bottom of the dust accumulation platform 1.1 and the mortar discharge pipe 3, the connection status of the mortar discharge pipe 3 itself, etc., the dust accumulation platform 1.1 is provided with an inspection manhole pipe 1.1.4, and the inspection manhole pipe 1.1.4 is provided with a cover plate 1.1.5. In this embodiment, the inspection manhole pipe 1.1.4 is arranged to penetrate the guide cushion layer 1.1.2, and the top of the cover plate 1.1.5 is 100mm to 600mm higher than the upper surface of the guide cushion layer 1.1.2; the outer peripheral surface of the inspection manhole pipe 1.1.4 is provided with a water stop ring 1.1.6 for sealing. Figure 6As shown, the water stop ring 1.1.6 is arranged on the plane where the inspection manhole pipe 1.1.4 and the guide cushion layer 1.1.2 intersect. The water stop ring 1.1.6 is a stainless steel ring plate. The width between the inner ring and the outer ring of the ring plate is 50mm to 150mm, and the thickness of the ring plate is 4mm to 6mm.

[0047] See also Figure 4 The inspection platform 1.3 includes a precast beam frame layer 1.3.1, a corrugated steel plate template layer 1.3.2 and a reinforced concrete layer 1.3.3 arranged from bottom to top. The precast beam frame layer 1.3.1 is placed on the top of the annular corbel 1.2. In this embodiment, the top surface width of the annular corbel 1.2 is 240mm to 500mm, which is convenient for achieving stable support for the precast beam frame layer 1.3.1. The steel beam model used in the precast beam frame layer 1.3.1 is HN900×300, the thickness of the corrugated steel plate template layer 1.3.2 is 1.2mm, and the thickness of the reinforced concrete layer 1.3.3 is 100mm.

[0048] The maintenance platform 1.3 is provided with a slurry discharge pipe through hole 1.3.4, which facilitates the slurry discharge pipe 3 to pass through the maintenance platform 1.3 from the bottom of the dust accumulation platform 1.1 and connect to the slurry collection pool 4; the slurry discharge pipe 3 includes a first discharge pipe section 3.1 and a second discharge pipe section 3.2, the starting end of the first discharge pipe section 3.1 is connected to the bottom of the slurry collection pit 1.1.1, and is in a horizontal Z-shaped structure, which facilitates the formation of a larger maintenance space between the dust accumulation platform 1.1 and the maintenance platform 1.3, and avoids the slurry discharge pipe 3 from interfering with the maintenance personnel; see Figure 8 The starting end of the second discharge pipe section 3.2 is provided with an open portion 3.2.1 arranged opposite to the end of the first discharge pipe section 3.1. The open portion 3.2.1 is a funnel-shaped structure with a larger top and a smaller bottom, with an upper diameter of 300mm, a lower diameter of 180mm, a wall thickness of 6mm, and a total height of 350mm, so that the end of the first discharge pipe section 3.1 can be easily extended into the open portion 3.2.1 to prevent the mortar from leaking out and release the thermal stress generated by the flue gas temperature at the end of the first discharge pipe section 3.1; the mortar discharge pipe 3 is made of stainless steel pipe with a pipe diameter of 100mm to 300mm and a pipe wall thickness of 4mm to 10mm, which can withstand mortar corrosion. The stainless steel pipe used in this embodiment has a specification of φ168×5mm; the mortar discharge pipe 3 can be formed by connecting multiple sections of mortar discharge pipe sections, such as Figure 5 As shown, in this embodiment, the length of the slurry discharge pipe section 3.2.2 in the second discharge pipe section 3.2 is 5000 mm.

[0049] The concrete support section 1 is provided with a plurality of embedded connectors 1.4 for fixing the mortar discharge pipe 3. In this embodiment, the embedded connector 1.4 includes an embedded component 1.4.1, a steel support component 1.4.2 and a U-shaped clamp 1.4.3. The embedded component 1.4.1 is arranged inside the side wall of the concrete support section 1 and connected to the steel support component 1.4.2. The mortar discharge pipe 3 is fixed to the steel support component 1.4.2 by the U-shaped clamp 1.4.3. Fig. 9 In this embodiment, the embedded part 1.4.1 is a steel embedded part of 300mm (length) × 300mm (width) × 10mm (thickness), the steel support part 1.4.2 is made of L75×6 angle steel, and the U-shaped clamp 1.4.3 is made of carbon steel bar with a diameter of 20mm.

[0050] See also Figure 1 The concrete support section 1 includes a chimney foundation section 1.5, a concrete cylinder section 1.6 and a transition cylinder section 1.7 arranged from bottom to top; in this embodiment, the chimney foundation section 1.5 is a reinforced concrete circular raft slab with a thickness of 1100 mm and a maximum diameter of 12.8 m. The upper wall thickness of the chimney foundation section 1.5 becomes thinner from bottom to top, such as Figure 5 As shown; the concrete cylinder section 1.6 is a truncated cone structure with a small top and a large bottom. The slope of the cylinder side wall of the concrete cylinder section 1.6 is 3% to 8%, and the thickness of the cylinder side wall is 240mm to 450mm. In this embodiment, the outer diameter of the cylinder bottom of the concrete cylinder section 1.6 is 9.2m, the cylinder slope is 3%, and the total height of the concrete cylinder section 1.6 is 50m. In the height range of 0 to 30m, the wall thickness of the concrete cylinder section 1.6 is 450mm, and in the height range of 30m to 50m, the wall thickness of the concrete cylinder section 1.6 is 400mm; the annular corbel 1.2 is arranged inside the conversion transition cylinder section 1.7, and the height is 1600mm. The dust accumulation platform 1.1 is arranged at the top of the conversion transition cylinder section 1.7. The wall thickness of the conversion transition cylinder section 1.7 increases from bottom to top, so that the vertical cross-section of the side wall of the conversion transition cylinder section 1.7 is a trapezoidal shape with a thin bottom and a thick top, as shown Figure 4 As shown, the thickness at the bottom of the trapezoid is 240mm~450mm, and the thickness at the top of the trapezoid is 500mm~1000mm. Since the top of the transition cylinder section 1.7 supports the steel structure cylinder section 2, it needs to withstand greater bending moment and shear force while bearing pressure. Increasing the top wall thickness of the transition cylinder section 1.7 is beneficial to improving the stress condition of the transition cylinder section 1.7.

[0051] See also Figure 2 and Figure 3The steel structure cylinder section 2 includes several sections of detachably connected steel smoke exhaust pipe sections 2.2; the steel smoke exhaust pipe section 2.2 includes an external substrate layer 2.2.1 and an annular stiffening rib 2.2.2 arranged on the outer peripheral surface of the external substrate layer 2.2.1; in this embodiment, the external substrate layer 2.2.1 is made of carbon steel or low-alloy high-strength steel, the diameter of the external substrate layer 2.2.1 is 2500mm~6000mm, and the wall thickness of the external substrate layer 2.2.1 is 6mm~25mm. In this embodiment, the annular stiffening rib 2.2.2 on the outer peripheral surface of the external substrate layer 2.2.1 is made of Q235 weathering steel, which is used to improve the corrosion resistance of the steel smoke exhaust pipe section 2.2.

[0052] See also Figure 3 Flanges 2.2.3 are provided at both upper and lower ends of the steel smoke exhaust pipe section 2.2 for connecting adjacent steel smoke exhaust pipe sections 2.2 by bolts; the connecting bolts are 8.8-grade or 10.9-grade high-strength bolts, with a bolt length of 60mm to 180mm and a bolt diameter of 20mm to 32mm.

[0053] See also Figure 4 , the anti-corrosion layer 2.1 is arranged on the inner wall of the external substrate layer 2.2.1, and the material of the anti-corrosion layer 2.1 is one of titanium steel plate, stainless steel plate or acid-resistant brick, and the edge of the anti-corrosion layer 2.1 is connected to the edge of the anti-corrosion layer 1.1.3. When the material of the anti-corrosion layer 2.1 is titanium steel plate or stainless steel plate, the thickness of the anti-corrosion layer 2.1 is 1mm~2mm. At this time, the anti-corrosion layer 1.1.3 on the upper surface of the slurry collection pit 1.1.1 and the guide pad 1.1.2 in the ash accumulation platform 1.1 is a corrosion-resistant modified polyvinyl chloride (HFVC) coating structure or a fiberglass coating structure, and the thickness of the anti-corrosion layer 1.1.3 is 5mm~10mm; when the material of the anti-corrosion layer 2.1 is acid-resistant When the lightweight acid-resistant brick anti-corrosion lining is made of bricks, the thickness of the anti-corrosion layer 2.1 is 50mm~120mm. At this time, the anti-corrosion layer 1.1.3 on the upper surface of the mortar collection pit 1.1.1 and the diversion pad 1.1.2 in the ash accumulation platform 1.1 is the Bingold anti-corrosion lining system. The setting of the anti-corrosion layer 1.1.3 is determined according to the material selection of the anti-corrosion layer 2.1, so that the anti-corrosion layer 1.1.3 and the anti-corrosion layer 2.1 form a better match.

[0054] See also Figure 2 and Figure 3The outer circumference of the steel structure cylinder section 2 is provided with a steel platform 2.3, a chimney manhole 2.4, a wind-breaking ring 2.5 and a staircase. In this embodiment, three steel platforms 2.3 are provided along the height direction of the steel structure cylinder section 2, and each steel platform 2.3 is provided with a steel guardrail 2.3.1 on the periphery to ensure the personal safety of maintenance personnel; the chimney manhole 2.4 is used to enable maintenance personnel to enter the chimney from the steel platform 2.3 for maintenance; the wind-breaking ring 2.5 is used to reduce the disturbance of airflow to the steel structure cylinder section 2. In this embodiment, the staircase includes a spiral steel staircase 2.6 and a straight steel staircase 2.7, and the steel platform 2.3, the chimney manhole 2.4, the wind-breaking ring 2.5 and the staircase are all made of Q235 weathering steel.

[0055] The steel structure cylinder section 2 and the concrete support section 1 are connected via a through-bolt assembly 5 , and a sealing grouting layer is filled between the steel structure cylinder section 2 and the concrete support section 1 .

[0056] In this embodiment, a conversion platform 1.7.1 for connecting the first section steel exhaust pipe section 2.2 is provided on the periphery of the dust accumulation platform 1.1. The outer cantilever plate of the conversion platform 1.7.1 is an annular cantilever plate with a cantilever length of 900 mm and a plate thickness of 160 mm. The conversion platform 1.7.1 is provided with a plurality of through-anchor bolt sleeves 1.7.2 penetrating the conversion platform 1.7.1 along the circumference of the first section steel exhaust pipe section 2.2, which are used to insert the through-bolt assembly 5 into the through-anchor bolt sleeves 1.7.2 to realize the first section steel exhaust pipe section 2.2. The smoke exhaust pipe section 2.2 is connected to the conversion platform 1.7.1, wherein the through-anchor sleeve 1.7.2 adopts a steel pipe with a specification of φ60×4mm, and multiple through-anchor sleeves 1.7.2 are all located on a circular distribution line with a diameter of 2112mm, and the center of the circular distribution line is on the central axis of the chimney. The through-bolts in the through-bolt assembly 5 are 800mm~1900mm in length and 24mm~64mm in diameter. In this embodiment, M42 through-bolts made of Q345C are used.

[0057] An annular rigid flange 2.2.4 is provided at the bottom of the first steel smoke exhaust pipe section 2.2. The annular rigid flange is a double-layer flange with a flange specification of 100mm (width) × 25mm (height). A stiffening plate with a thickness of 180mm (height) × 20mm (thickness) is provided between the double-layer flanges. The total height of the annular rigid flange is 230mm.

[0058] After the connection between the first steel exhaust pipe section 2.2 and the conversion platform 1.7.1 is completed, an inorganic high-strength grouting material with a strength of 80MPa is used in the gap between the first steel exhaust pipe section 2.2 and the conversion platform 1.7.1 to form a sealing grouting layer with a thickness of 50mm.

[0059] A construction method for a single-tube anti-corrosion chimney, used to manufacture the above-mentioned single-tube anti-corrosion chimney, comprises the following steps:

[0060] Step 1: pouring the chimney foundation section 1.5 of the concrete support section 1, and then casting the concrete cylinder section 1.6 in sections, and laying out the mortar discharge pipe 3 and the mortar collection tank 4;

[0061] Specifically, after leveling the site, the chimney foundation pit is excavated to the designed depth, the chimney foundation section 1.5 is cast in situ, and concrete cylinder section 1.6 dowel bars are reserved on the top of the chimney foundation section 1.5; after the construction of the chimney foundation section 1.5 is completed, the chimney foundation pit is backfilled, and a mortar collection pool 4 is poured on the ground at the same time; the concrete cylinder section 1.6 is cast in sections by using the flip form construction method or the slip form construction method, and a mortar discharge pipe 3 is arranged on the side wall of the concrete cylinder section 1.6, and the mortar discharge pipe sections 3.2.2 are connected by butt welds.

[0062] Step 2: Prepare the annular corbel 1.2 by cast-in-place construction inside the concrete cylinder section 1.6. After the concrete strength of the annular corbel 1.2 is ≥70%, hoist the precast beam frame layer 1.3.1 of the maintenance platform 1.3 onto the annular corbel 1.2, horizontally lay the corrugated steel plate formwork layer 1.3.2 on the precast beam frame layer 1.3.1, and cast the reinforced concrete layer 1.3.3;

[0063] Specifically, a circular corbel 1.2 is cast on the inner wall of the concrete cylinder section 1.6, and side wall dowel bars of the transition cylinder section 1.7 are reserved on the upper part of the concrete cylinder section 1.6. After the concrete strength of the circular corbel 1.2 reaches 70%, the precast beam frame layer 1.3.1 of the maintenance platform 1.3 is hoisted onto the circular corbel 1.2, and a corrugated steel plate template layer 1.3.2 is horizontally laid on the precast beam frame layer 1.3.1, and the reinforced concrete layer 1.3.3 is poured;

[0064] Step 3: After the concrete strength of the reinforced concrete layer 1.3.3 of the maintenance platform 1.3 reaches ≥70%, the pouring of the transition cylinder section 1.7 is completed;

[0065] Specifically, after the concrete strength of the reinforced concrete layer 1.3.3 reaches 70%, the transition cylinder section 1.7 is cast in situ using a platform formwork, and when constructing the conversion platform 1.7.1, the through-anchor sleeve 1.7.2, the first discharge pipe section 3.1 of the mortar discharge pipe 3 and the inspection manhole pipe 1.1.4 are pre-buried in the conversion platform 1.7.1.

[0066] Step 4: Install the first steel exhaust pipe section 2.2 to the upper part of the concrete support section 1, pour the dust accumulation platform 1.1 on the top of the transition cylinder section 1.7, and complete the setting of the second anti-corrosion layer 1.1.3; then install several steel exhaust pipe sections 2.2 in sequence on the first steel exhaust pipe section 2.2 to form a steel structure cylinder section 2;

[0067] Specifically, the steel exhaust pipe section 2.2 is manufactured on the ground in sections, and the anti-corrosion layer 2.1 in each section of the steel exhaust pipe section 2.2 and the steel exhaust pipe accessories (steel platform 2.3, chimney manhole 2.4, wind break ring 2.5 and ladder, etc.) are also manufactured and installed on the ground. After the concrete strength of the conversion platform 1.7.1 reaches 90%, a crawler crane is used to first hoist the first section of the steel exhaust pipe section 2.2 and place it on the conversion platform 1.7.1. After the annular rigid flange 2.2.4 at the bottom of the first section of the steel exhaust pipe section 2.2 is matched with the annularly distributed through-anchor bolt sleeve 1.7.2, the through-bolt assembly 5 is installed, and after the verticality of the first section of the steel exhaust pipe section 2.2 is straightened, the through-bolt assembly 5 is tightened, and then the high-strength secondary grouting material is used to fill and level the gap between the annular rigid flange 2.2.4 and the conversion platform 1.7.1. Subsequently, the dust accumulation platform 1.1 is poured on the top of the transition cylinder section 1.7, and the second anti-corrosion layer 1.1.3 is set; the other sections of the steel smoke exhaust cylinder section 2 are successively hoisted on the lower sections using a 300T crawler crane, and the sections of the steel smoke exhaust cylinder section 2 are fastened using flanges + bolts.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A single-tube anti-corrosion chimney, characterized in that: It comprises a concrete support section (1) and a steel structure cylinder section (2) arranged from bottom to top; the inner wall of the steel structure cylinder section (2) is provided with an anti-corrosion layer 1 (2.1); the top of the concrete support section (1) is provided with an ash accumulation platform (1.1) connected to the anti-corrosion layer 1 (2.1); the ash accumulation platform (1.1) is provided with a mortar collection pit (1.1.1); the bottom of the mortar collection pit (1.1.1) is connected to a mortar collection pool (4) inside the concrete support section (1) through a mortar discharge pipe (3); An annular corbel (1.2) and an inspection platform (1.3) placed on the annular corbel (1.2) are provided inside the concrete support section (1); the inspection platform (1.3) is located below the dust accumulation platform (1.1); an inspection manhole pipe (1.1.4) is provided on the dust accumulation platform (1.1); a cover plate (1.1.5) is provided on the inspection manhole pipe (1.1.4); a water stop ring (1.1.6) for sealing is provided on the outer peripheral surface of the inspection manhole pipe (1.1.4).

2. A single-tube anti-corrosion chimney according to claim 1, characterized in that: A guide cushion layer (1.1.2) is provided on the periphery of the mortar collection pit (1.1.1), and the slope of the guide cushion layer (1.1.2) is 5% to 10%; and an anti-corrosion layer 2 (1.1.3) is provided on the upper surfaces of the mortar collection pit (1.1.1) and the guide cushion layer (1.1.2).

3. The single-tube anti-corrosion chimney according to claim 1, characterized in that: The inspection platform (1.3) comprises a prefabricated beam frame layer (1.3.1), a corrugated steel plate template layer (1.3.2) and a reinforced concrete layer (1.3.3) arranged from bottom to top, and the prefabricated beam frame layer (1.3.1) is placed on top of the annular corbel (1.2).

4. The single-tube anti-corrosion chimney according to claim 1, characterized in that: The maintenance platform (1.3) is provided with a mortar discharge pipe through hole (1.3.4); the mortar discharge pipe (3) comprises a first discharge pipe section (3.1) and a second discharge pipe section (3.2); the starting end of the first discharge pipe section (3.1) is connected to the mortar collection pit (1.1.1), and the starting end of the second discharge pipe section (3.2) is provided with an open portion (3.2.1) arranged opposite to the end of the first discharge pipe section (3.1); and a plurality of embedded connectors (1.4) for fixing the mortar discharge pipe (3) are provided inside the concrete support section (1).

5. The single-tube anti-corrosion chimney according to claim 3, characterized in that: The concrete support section (1) comprises a chimney foundation section (1.5), a concrete cylinder section (1.6) and a conversion transition cylinder section (1.7) which are arranged from bottom to top; the concrete cylinder section (1.6) is a truncated cone structure which is smaller at the top and larger at the bottom; the cylinder side wall slope of the concrete cylinder section (1.6) is 3% to 8%, and the cylinder side wall thickness is 240 mm to 450 mm; the annular corbel (1.2) is arranged inside the conversion transition cylinder section (1.7), the dust accumulation platform (1.1) is arranged on the top of the conversion transition cylinder section (1.7), and the wall thickness of the conversion transition cylinder section (1.7) increases from bottom to top.

6. The single-tube anti-corrosion chimney according to claim 5, characterized in that: The steel structure cylinder section (2) comprises a plurality of detachably connected steel smoke exhaust pipe sections (2.2); the steel smoke exhaust pipe sections (2.2) comprise an external base material layer (2.2.1) and an annular stiffening rib (2.2.2) arranged on the outer peripheral surface of the external base material layer (2.2.1); the anti-corrosion layer one (2.1) is arranged on the inner wall of the external base material layer (2.2.1), and the material of the anti-corrosion layer one (2.1) is one of titanium steel plate, stainless steel plate or acid-resistant brick.

7. The single-tube anti-corrosion chimney according to claim 6, characterized in that: The outer peripheral surface of the steel structure cylinder section (2) is provided with a steel platform (2.3), a chimney manhole (2.4), a wind-breaking ring (2.5) and a ladder.

8. The single-tube anti-corrosion chimney according to claim 7, characterized in that: The steel structure cylinder section (2) and the concrete support section (1) are connected via a through-bolt assembly (5), and a sealing grouting layer is filled between the steel structure cylinder section (2) and the concrete support section (1).

9. A construction method for a single-tube anti-corrosion chimney, used for manufacturing the single-tube anti-corrosion chimney as claimed in any one of claims 6 to 8, characterized in that: The following steps are involved: Step 1: Cast the chimney foundation section (1.5) of the concrete support section (1), then cast the concrete cylinder section (1.6) in sections, and lay out the mortar discharge pipe (3) and mortar collection pool (4); Step 2: Prepare the annular corbel (1.2) by cast-in-place construction inside the concrete cylinder section (1.6); after the concrete strength of the annular corbel (1.2) is ≥70%, hoist the precast beam frame layer (1.3.1) of the maintenance platform (1.3) onto the annular corbel (1.2); horizontally lay the corrugated steel plate formwork layer (1.3.2) on the precast beam frame layer (1.3.1) and cast the reinforced concrete layer (1.3.3); Step 3: After the concrete strength of the reinforced concrete layer (1.3.3) of the maintenance platform (1.3) reaches ≥70%, the pouring of the transition cylinder section (1.7) is completed; Step 4: Install the first steel smoke exhaust pipe section (2.2) to the upper part of the concrete support section (1), pour the dust accumulation platform (1.1) on the top of the transition cylinder section (1.7), and complete the setting of the second anti-corrosion layer (1.1.3); then install several steel smoke exhaust pipe sections (2.2) in sequence on top of the first steel smoke exhaust pipe section (2.2) to form a steel structure cylinder section (2).

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