Dowel type connecting structure and integrated air pipe of magnesia inorganic refractory air pipe

Abstract

The application discloses a kind of mineral magnesium inorganic refractory limit air pipe's character type connecting structure, by self-tapping screw and the character type connecting piece of integration are formed, character type connecting piece includes with the first part of air pipe transverse base plate adaptation and the second part of air pipe vertical base plate adaptation;First part is channel steel, second part is formed by two parallel plates, two parallel plates are fixedly connected with first part and one of them is coplanar with the groove bottom wall of channel steel first part.The application also discloses the integration of air pipe using mineral magnesium inorganic refractory limit air pipe's character type connecting structure, by air pipe transverse base plate, air pipe vertical base plate, the character type connecting structure is formed;Air pipe transverse base plate or air pipe vertical base plate includes refractory insulation layer, and refractory insulation layer uses mineral magnesium inorganic refractory layer.The air pipe of the application is connected using four character type bars, and is fixed by self-tapping screw, so that the firmness of air pipe, seismic coefficient is greatly improved.

Description

Technical Field

[0001] This invention relates to air duct systems, specifically to a jack-shaped connection structure and integrated air duct for a magnesium inorganic refractory duct. Background Technology

[0002] In existing fire-resistant duct technology, galvanized iron sheet ducts are commonly used. Their manufacturing requires high-power equipment, resulting in energy consumption, low assembly efficiency (over 30 square meters per person), and the metal ducts resonate during operation, leading to rust, corrosion, and bacterial growth. Iron sheet ducts, joined by interlocking edges, have low compressive and seismic strength, low fire resistance, and poor insulation. To meet national standards, fire-resistant insulation material must be wrapped around the iron duct frame, requiring secondary installation, which is labor-intensive, expensive, and significantly increases product costs. Assembly is inconvenient, the materials are not environmentally friendly, and the strength is low. Current assembly processes involve cutting 90° grooves in the sheet metal and folding the edges, but while this method is fast, it is still insufficient in terms of compressive strength, seismic resistance, and duct strength deformation.

[0003] Furthermore, transporting duct splices is difficult and inefficient. When transported by stacking, the vibrations and pressure during transport easily deform the splices and damage the anti-corrosion layer (as evidenced by Zhong Shuji's paper "Construction Technology of All-Flange Assembled Ducts" published in the 10th issue of *Mechanical & Electrical Installation* in 2023). To facilitate hoisting operations and improve hoisting efficiency, Zhong Shuji's paper in *Mechanical & Electrical Installation* proposes the following technical measures: optimizing the duct reinforcement nodes and using reinforcing angle steel as a permanent balance beam for the duct, effectively ensuring that the duct will not deform during hoisting. Simultaneously, permanent lifting holes are provided on the reinforcing angle steel, allowing the hoisting operation to be completed by disassembling and removing the shackles only once during transfer and hoisting. Therefore, it is necessary to add reinforcement angle steel components, and the added components can only be used for one purpose, namely reinforcement (the added angle steel can only be used to reinforce the duct frame, and lifting holes must be set on the angle steel to facilitate hoisting). Summary of the Invention

[0004] The purpose of this invention is to overcome the defects in the existing technology and provide a jack-shaped connection structure for a magnesium inorganic refractory duct. It is easy to assemble, uses environmentally friendly materials, and has high strength. In terms of manufacturing, it is simple and quick, with a construction speed of more than 60 square meters per person, a service life of more than 20 years, and basically requires no maintenance.

[0005] To achieve the above objectives, the technical solution of the present invention is to design a jack-shaped connection structure for a magnesium inorganic refractory duct, which is composed of self-tapping screws and an integrally formed jack-shaped connector. The jack-shaped connector includes a first part adapted to the horizontal base plate of the duct and a second part adapted to the vertical base plate of the duct.

[0006] The first part is channel-steel-shaped, the second part is formed by two parallel arranged plates, both of the two parallel arranged plates are fixedly connected to the first part, and one of the plates is coplanar with the groove bottom wall of the channel-steel-shaped first part. The air ducts are connected by four jin-shaped strips and fixed by self-tapping screws, which greatly improves the firmness and seismic coefficient of the air ducts.

[0007] A further technical solution is that the jin-shaped connecting piece is a jin-shaped light steel angle keel, which is made of hot-dip galvanized sheet.

[0008] The present invention also provides a technical solution that an integrated air duct adopting the jin-shaped connecting structure of an ore-magnesium inorganic fire-resistant limit air duct is composed of an air duct transverse base plate, an air duct vertical base plate, and the said jin-shaped connecting structure; both the air duct transverse base plate and the air duct vertical base plate comprise a fire-resistant and heat-insulating layer, and the fire-resistant and heat-insulating layer adopts an ore-magnesium inorganic fire-resistant layer;

[0009] The air duct transverse base plate or the air duct vertical base plate further comprises a protective steel panel arranged outside the fire-resistant layer, or the air duct transverse base plate or the air duct vertical base plate further comprises high-corrosion-resistant metal plates or anti-corrosion aluminum foils arranged on both the inner and outer sides of the fire-resistant layer. That is, the cross-sectional structure of the air duct includes a color steel plate (i.e., the protective steel panel), and at least one side of the inorganic fire-resistant layer (i.e., the fire-resistant layer) is fixedly provided with a color steel plate; the color steel plate can be used or not used according to different grades; if higher requirements for the fire-resistant level or other special requirements such as longer fire-resistant time are required, galvanized steel plates or metallic aluminum protective layers can be used to replace the color steel plates;

[0010] The fire-resistant layer in the present invention satisfies the following conditions: the product density is ≤1000kg / m, the thermal conductivity is ≤0.2W / (m·k), the flue gas toxicity safety level reaches AQ1, and the mold resistance performance is grade 0.

[0011] Convenient assembly, environmentally friendly materials and high strength;

[0012] Production does not require high-power equipment, no energy consumption, no hammering during assembly, and no noise generated; no resonance occurs during operation, no rust and corrosion, no bacteria breeding, and high fire resistance rating. The material reaches A1 non-combustibility, has good thermal insulation effect, and the thermal conductivity is less than 0.0215w / m.k.

[0013] The present invention adopts integrated assembly and has a small volume, which can increase the building floor height and enlarge the space in the building;

[0014] The assembly process changes the previous mode of cutting 90° grooves on plates and folding for splicing, after multiple improvements by the applicant's company, the jin-shaped connection of the present invention is adopted, during assembly, not only the efficiency is higher, but also the performance in terms of compression resistance, seismic resistance, air duct strength and deformation amount exceeds national specifications.

[0015] In terms of production, it is simple and fast, the construction speed is more than 60 square meters per capita, the service life is more than 20 years, and basically no maintenance is required.

[0016] Each type and size of duct uses independent sheet metal connected by metal T-shaped self-tapping screws. If damage occurs, only the damaged sheet metal needs to be replaced, reducing maintenance costs. Other existing connection methods require replacing the entire duct if one side is damaged, which is more expensive.

[0017] The prefabricated integrated air duct meets the fire resistance limit requirements of 0.5-3h (fire resistance time), has a high degree of assembly, is easy to install, and saves space.

[0018] A further technical solution is that the fire-resistant layer thickness is 10-20mm, the protective steel panel is a color steel plate, a metal aluminum protective layer, or a galvanized steel plate, and the thickness of the protective steel panel is 0.16-0.5mm; the duct horizontal base plate and the duct vertical base plate are each provided in two pieces; the jack-shaped connection structure is provided in four pieces.

[0019] A further technical solution is that a nut is provided to match the self-tapping screw on the vertical base plate of the air duct. The nut is located on the outside of the air duct and is matched with the end of the shank of the aforementioned self-tapping screw. The head of the self-tapping screw on the vertical base plate of the air duct is located on the inside of the air duct; the head of the self-tapping screw on the horizontal base plate of the air duct is located on the outside of the air duct.

[0020] Both the vertical and horizontal duct substrates are marked with identification layers to indicate the installation points of the self-tapping screws. This addition of a nut serves several purposes: firstly, it eliminates the need for spacers (or padding) between adjacent duct substrates (vertical or horizontal) during pre-transport stacking; secondly, it prevents collisions between adjacent substrates during transport; and thirdly, it allows the nut to be used as a lifting component during on-site assembly of the ductwork. One component serves multiple functions.

[0021] A further technical solution is that the stacking method for the vertical and horizontal base plates of the integrated duct before transportation is as follows:

[0022] First, drive self-tapping screws into the marking layer on each vertical or horizontal duct substrate that needs to be stacked. Cover the part of the self-tapping screw that extends beyond the vertical or horizontal duct substrate with a nut to prevent the pointed part of the self-tapping screw from touching the adjacent vertical or horizontal duct substrate. Then stack the adjacent vertical or horizontal duct substrates, aligning and abutting the nuts on the adjacent vertical or horizontal duct substrates.

[0023] A further technical solution is that the stacking method for the vertical and horizontal base plates of the integrated duct before transportation is as follows:

[0024] First, drive self-tapping screws into the marking layer on a certain vertical or horizontal duct substrate that needs to be stacked. Put a nut on the part of the self-tapping screw that extends beyond the vertical or horizontal duct substrate to prevent the pointed part of the self-tapping screw from touching the adjacent vertical or horizontal duct substrate. Share one nut for every two adjacent vertical or horizontal duct substrates.

[0025] Then, self-tapping screws are also driven into the marking layer on the vertical or horizontal base plate of the adjacent duct, and the portion of the self-tapping screw that extends beyond the vertical or horizontal base plate of the duct is threaded to the aforementioned nut.

[0026] The nut has a bidirectional internal thread, meaning that there are two internal thread sections with opposite directions on the inner wall of the nut. There is also a smooth section between adjacent internal thread sections to widen the length of the thread to accommodate the tips of two adjacent self-tapping screws.

[0027] By designing a single structure and combining it with different applications in various processes, an excellent effect can be achieved. In other words, one structure can function effectively in different stages. By coordinating the entire duct production, manufacturing, and transportation process, a single long nut structure can be added. This eliminates the need for padding (or paper pads) between adjacent magnesium refractory boards during pre-transport stacking, prevents collisions between adjacent boards during transport, ensures the stability of the refractory boards during transport, facilitates hoisting after the duct base plates are assembled using a lever-shaped connection structure, and also facilitates the handling of magnesium refractory boards.

[0028] Unlike existing technologies, which require additional components (or structures) to achieve other effects or functions, this application can achieve multiple functions (solve multiple technical problems) and achieve multiple beneficial effects with only one component (or structure).

[0029] The advantages and beneficial effects of this invention are as follows:

[0030] The duct is connected by four jack-type strips and fixed with self-tapping screws, which greatly improves the duct's strength and seismic resistance.

[0031] The refractory layer in this invention meets the following requirements: product density ≤1000kg / m, thermal conductivity ≤0.2W / (m·k), flue gas toxicity safety level reaches AQ1, and mold resistance is level 0;

[0032] Easy to assemble, environmentally friendly materials, and high strength;

[0033] The production does not require high-power equipment, consumes no energy, requires no hammering during assembly, and generates no noise; no resonance occurs during operation, the product is resistant to rust, corrosion and bacterial growth, and has a high fire resistance rating. The material achieves Class A1 non-combustibility, has good thermal insulation performance, and a thermal conductivity of less than 0.0215w / m·k.

[0034] The present invention adopts integrated assembly and has a small volume, which can increase the building floor height and expand the indoor space of the building;

[0035] The assembly process abandons the conventional method of cutting 90° grooves on plates and connecting by folded edges, and after multiple improvements by the applicant, the #-shaped connection of the present invention is adopted. During assembly, the present invention not only achieves higher assembly efficiency, but also outperforms the national specifications in terms of compression resistance, shock resistance, air duct strength and deformation amount.

[0036] In terms of production, the process is simple and fast, the construction speed reaches over 60 square meters per capita, the service life is more than 20 years, and basically no maintenance is required.

[0037] For air ducts of each model and size, independent plates are used, and connected with metal #-shaped members and self-tapping screws; if damage occurs, only the damaged independent plate needs to be replaced, which reduces maintenance costs. In contrast, if damage occurs to one side in connection modes of other prior art, the entire section of air duct needs to be replaced, resulting in high cost.

[0038] The prefabricated integrated air duct can meet the fire resistance requirement of 0.5-3h (fire resistance time), features high prefabrication degree, convenient installation and space saving.

[0039] By adding a component, namely a nut, on one hand, the process of arranging backing plates (or backing paper, etc.) between adjacent air duct base plates (i.e., vertical air duct base plates or horizontal air duct base plates) can be omitted in the stacking process before transportation, and adjacent air duct base plates can be prevented from bumping each other during transportation; on the other hand, the nut can be used as a hoisting member when the air duct base plates are assembled into an air duct and hoisted on site, so one component achieves multiple functions.

[0040] Through the arrangement of one structure, excellent effects are achieved by matching different use modes in different working procedures, that is, one structure can function in different working procedures. By coordinating all links of production, manufacturing and transportation of the air duct, only adding a structure such as an elongated nut achieves multiple effects: the process of arranging backing plates (or backing paper, etc.) between adjacent mineral-magnesium inorganic refractory plates can be omitted in stacking before transportation, adjacent mineral-magnesium inorganic refractory plates can be prevented from bumping each other during transportation, the mineral-magnesium inorganic refractory plates can be kept stable and prevented from moving during transportation, the hoisting is facilitated after the air duct base plates are made into an air duct through the #-shaped connection structure, and the taking and placing of the mineral-magnesium inorganic refractory plates is also facilitated.

[0041] Unlike existing technologies, which require additional components (or structures) to achieve other effects or functions, this application can achieve multiple functions (solve multiple technical problems) and achieve multiple beneficial effects with only one component (or structure). Attached Figure Description

[0042] Figure 1 This is the inspection report from Suzhou Quality Supervision and Inspection Institute regarding the 14mm inorganic fireproof layer of the magnesium oxide board used in the air duct of Embodiment 2 of the present invention;

[0043] Figure 2 This is the type test (safety performance) test report of the steel-faced magnesium ventilation duct of the present invention, conducted by the Sichuan Fire Research Institute of the Ministry of Emergency Management and the National Fireproof Building Materials Quality Inspection and Testing Center for Embodiment 2.

[0044] Figure 3 This is a schematic diagram of an embodiment of the "Jin" shaped connection structure of a magnesium inorganic refractory duct of the present invention applied to a duct.

[0045] Figure 4 yes Figure 3 Schematic diagram of the cross-section of the central endotracheal tube;

[0046] Figure 5 yes Figure 4 A magnified view of the upper left corner;

[0047] Figure 6 yes Figure 5 Enlarged schematic diagram of the "Jin" shaped connector;

[0048] Figure 7 This is a partially enlarged schematic diagram of a corner of the cross-section of the duct in Embodiment 2 of the present invention;

[0049] Figure 8 This is a partially enlarged schematic diagram of a corner of the cross-section of the duct in Embodiment 3 of the present invention;

[0050] Figure 9 This is a partially enlarged schematic diagram of a corner of the cross-section of the air duct in Embodiment 4 of the present invention;

[0051] Figure 10 This is a schematic diagram of the connection of the air duct after the air duct in Embodiment 1 of the present invention;

[0052] Figure 11 This is a schematic diagram of Embodiment 5 of the present invention;

[0053] Figure 12 yes Figure 11 An enlarged schematic diagram of part A in the middle;

[0054] Figure 13 yes Figure 12 A schematic diagram of the self-tapping screw and nut parts;

[0055] Figure 14 yes Figure 11 A schematic diagram of the stacking of vertical or horizontal base plates for central air ducts before transportation.

[0056] Figure 15 yes Figure 14 Enlarged schematic diagram of part B in the middle;

[0057] Figure 16 This is a schematic diagram of Embodiment Six of the present invention;

[0058] Figure 17 yes Figure 16 An enlarged schematic diagram of section C;

[0059] Figure 18 yes Figure 17 Schematic diagram of the slotted section and fixed pulley;

[0060] Figure 19 yes Figure 18 A schematic diagram of a central slot;

[0061] Figure 20 This is a schematic diagram of the splicing of two duct sections in Embodiment Six of the present invention;

[0062] Figure 21 yes Figure 20 An enlarged schematic diagram of section D in the middle;

[0063] Figure 22 yes Figure 20 An enlarged schematic diagram of section E in the middle.

[0064] In the diagram: 1. Self-tapping screw; 2. T-shaped connector; 3. Horizontal base plate of duct; 4. First part; 5. Vertical base plate of duct; 6. Second part; 7. Fire-resistant layer; 8. Protective steel panel; 9. Nut; 10. Marking layer; 11. Smooth rod section; 12. Grooved section; 13. Smooth section; 14. H-shaped insert; 15. Protrusion; 16. Groove; 17. Glue storage tank; 18. Glue storage bag; 19. Sliding buckle; 20. Connecting rope; 21. Wheel body; 22. Axle; 23. Slot; 24. Compression spring; 25. Blind hole; 26. Channel. Detailed Implementation

[0065] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0066] Example 1:

[0067] like Figures 3 to 6 , Figure 10 As shown, this invention relates to a jack-shaped connection structure for a magnesium inorganic refractory duct, comprising a self-tapping screw 1 and a jack-shaped connector 2 integrally formed therein. The jack-shaped connector 2 includes a first part 4 adapted to the horizontal base plate 3 of the duct and a second part 6 adapted to the vertical base plate 5 of the duct. The first part 4 is in the shape of a channel steel, and the second part 6 is composed of two parallel plates, both of which are fixedly connected to the first part 4, with one plate being coplanar with the bottom wall of the channel steel-shaped first part 4. The jack-shaped connector 2 is a jack-shaped light steel angle keel made of hot-dip galvanized sheet.

[0068] An integrated duct employing a magnesium-based inorganic refractory duct with a triangular connection structure comprises a horizontal base plate 3, a vertical base plate 5, and the triangular connection structure. Both the horizontal base plate 3 and the vertical base plate 5 include a refractory insulation layer, which is a magnesium-based inorganic refractory layer 7. The horizontal base plate 3 and the vertical base plate 5 also include a protective steel panel 8 installed outside the refractory layer 7, or the horizontal base plate 3 and the vertical base plate 5 further include highly corrosion-resistant metal plates or anti-corrosion aluminum foil installed on both the inner and outer sides of the refractory layer 7. The refractory layer 7 has a thickness of 10–20 mm. The protective steel panel 8 is a color-coated steel plate, a metallic aluminum protective layer, or a galvanized steel plate, and its thickness is 0.16–0.5 mm. Two horizontal base plates 3 and two vertical base plates 5 are provided. Four triangular connection structures are provided.

[0069] For air ducts with a fire resistance rating of 0.5h: use 0.16mm color steel (i.e., the protective steel panel 8 uses 0.16mm color steel) + 10mm inorganic fireproof layer;

[0070] Alternatively, an integrated structure with a 10mm inorganic fireproof layer (i.e., fire-resistant layer 7, which can be made of vitrified microspheres, fire-retardant and heat-insulating filling materials, providing heat insulation, sound insulation, and fire resistance, with a density of 750kg / m³) can be constructed. The duct is manufactured in a factory using metal connectors (i.e., the metal connector structure of this invention) and composite panels. A 0.16mm color steel (or aluminum protective layer) is built into the duct (i.e., the inner protective steel panel also uses 0.16mm color steel), forming a finished integrated duct (the duct cross-section from the outside to the inside consists of a protective steel panel, fire-resistant layer 7, and a protective steel panel; both the inner and outer protective steel panels use 0.16mm color steel). The finished duct is assembled on-site using H-shaped inserts 14, and the overall duct structure meets the 0.5h fire resistance limit requirement.

[0071] In this invention, the mineral magnesium inorganic refractory ultimate air duct refers to the air duct whose refractory and heat insulation layer is made of mineral magnesium inorganic refractory layer, and a protective steel panel is set outside the refractory layer, or a highly corrosion-resistant metal plate or anti-corrosion aluminum foil is set on both the inner and outer sides of the refractory layer. The air duct made in this way is called steel-faced magnesium smoke prevention and exhaust composite air duct.

[0072] The fire-resistant and heat-insulating layer used in steel-faced magnesium composite smoke-proof and smoke-exhausting ducts combines three major attributes: fire resistance, fire resistance, and heat insulation. It is a brand-new fire-resistant and heat-insulating material that can simultaneously meet the requirements of GB / T17428-2009 for fire integrity and heat insulation in building smoke-proof and exhaust ducts.

[0073] The steel-faced magnesium composite smoke-proof and exhaust duct has a single protective steel layer or both inner and outer protective layers made of highly corrosion-resistant metal plates or anti-corrosion aluminum foil, with a service life of over 30 years. The duct connection profiles use dedicated angle steel flanges (or achieve connection stability through self-tapping screws and a jack-type keel connection structure), featuring extremely high connection strength and convenient installation. The duct assembly utilizes the jack-type connection structure of this invention, with angle iron flanges fabricated and connected on-site.

[0074] Steel-faced magnesium composite smoke-proof and exhaust ducts have the following advantages:

[0075] High security:

[0076] Fire resistance: All materials used are A1 grade non-combustible; Compressive strength: Wind pressure resistance can reach over 3000pa, far exceeding the national standard requirement of ≥1500pa.

[0077] Increase elevation:

[0078] Under the premise of meeting the requirements of fire resistance and heat insulation, the duct itself has a low thickness, and the duct can be installed on the ceiling without secondary wrapping.

[0079] Shorten the construction period:

[0080] Prefabricated air ducts are available for easy installation and efficient construction; the ducts come with a built-in fire-resistant insulation layer, eliminating the need for fireproof wrapping and reducing the construction period by more than 2 times.

[0081] Beautiful and durable:

[0082] The inner and outer walls of the duct are made of highly corrosion-resistant metal plates or high-strength anti-corrosion aluminum foil, which prevents the duct from corroding and rusting caused by damp garages. Compared with the process of covering galvanized ducts with rock wool and fireproof board, it eliminates after-sales problems such as bulging, deformation and cracking caused by moisture absorption of fireproof board.

[0083] Light body and weight loss:

[0084] Compared to galvanized ducts, the rock wool and fireproof board coating reduces the weight of the duct by more than 50%, effectively reducing the building load and saving construction costs.

[0085] The construction method is as follows:

[0086] 1. The ductwork is connected using H-type inserts (14mm diameter). (The ductwork splicing connection method is as follows:) Figure 1

[0087] 0) The air duct and the flange are fixed by self-tapping screws, a 5mm aluminum silicate sealing rubber strip is arranged between adjacent flanges, and the spacing of screws on the air duct flange is not more than 150mm.

[0088] 2. When the long side dimension b of the air duct is ≤1250mm, the standard length of the pipe section is 2420mm, which is manufactured with the full length of the plate; when the long side dimension of the air duct satisfies 1250 < b ≤ 2400, the standard length of the pipe section is 1250mm;

[0089] it is manufactured with the full length of the plate; when the long side dimension b of the air duct is > 2400mm, the standard length of the pipe section is 1250mm, and the long side plate surface needs to be spliced. The specific requirements for plate splicing are as follows:

[0090] 1) The longitudinal splicing seams of air duct plates shall avoid the central line position of the long side, the longitudinal splicing seams on opposite plate surfaces shall be staggered and form a cross shape, and reinforcement measures shall be taken at the same time;

[0091] 2) The plate joint profile is formed by connecting two H-shaped grooves back to back, the wall thickness of the H-shaped groove shall not be less than 1.2mm. The adjacent H-shaped grooves are connected and fixed by Φ5 rivets, and the rivet spacing shall not be more than 150mm;

[0092] 3) The H-shaped groove and the plate are fastened by self-tapping screws, and the screw spacing shall not be more than 120mm;

[0093] 4) The gaps between adjacent H-shaped grooves and between the H-shaped grooves and the plate splicing seams shall be filled compactly and evenly with sealant to avoid air leakage;

[0094] 5) When the long side dimension of the air duct is > 3000mm, the splicing seam shall be further reinforced with supports, and the spacing of the internal supports in both vertical and horizontal directions shall not be more than 950mm.

[0095] Example 2:

[0096] The difference from Example 1 is that, as shown in Figure 1 , Figure 2 and Figure 7 , for an air duct with a fire resistance rating of 1.0h: it adopts 0.16mm color steel + 14mm inorganic fire protection layer (wherein, the test report of the 14mm inorganic fire protection layer is shown in Figure 1 );

[0097] Alternatively, an integrated structure with a 14mm inorganic fireproof layer (heat insulation, sound insulation, fireproof, density: 750kg / m³); using jack-shaped metal connectors (i.e., the jack-shaped connection structure of this invention) and composite panels for factory production; with a 0.2mm galvanized steel plate built into the duct, forming a finished integrated duct (the duct cross-section from the outside to the inside consists of a protective steel panel 8, a fire-resistant layer 7, and another protective steel panel 8; both the inner and outer protective steel panels 8 are made of 0.2mm galvanized steel plate). The finished duct is assembled on-site using H-shaped inserts. The overall duct structure meets the 1.0h fire resistance limit requirement, as shown in the test report. Figure 2 .

[0098] Example 3:

[0099] The difference from Embodiment 1 is that, as Figure 8 As shown, for air ducts with a fire resistance rating of 1.5h: 0.2mm color steel + 16mm inorganic fireproof layer is used;

[0100] Alternatively, an integrated structure with a 16mm inorganic fireproof layer (heat insulation, sound insulation, fireproof, density: 750kg / m³) is used, employing a jack-shaped metal connector (i.e., the jack-shaped connection structure of this invention) and composite panels for factory production. A 0.3mm galvanized steel plate is built into the duct to form a finished integrated duct (the duct cross-section from the outside to the inside consists of a protective steel panel 8, a fire-resistant layer 7, and a protective steel panel 8; both the inner and outer protective steel panels 8 are made of 0.3mm galvanized steel plates). The finished duct is assembled on-site using H-shaped inserts, and the overall duct structure meets the 1.5h fire resistance limit requirement.

[0101] Example 4:

[0102] The difference from Embodiment 1 is that, as Figure 9 As shown, for air ducts with a fire resistance rating of 2.0h: 0.2mm color steel + 20mm inorganic fireproof layer is used;

[0103] Alternatively, an integrated structure with a 20mm inorganic fireproof layer (heat insulation, sound insulation, fireproof, density: 750kg / m³) can be constructed using a jack-shaped metal connector (i.e., the jack-shaped connection structure of this invention) and composite panels. The duct is internally fitted with a 0.5mm galvanized steel plate to form a finished integrated duct (the duct cross-section from the outside to the inside consists of a protective steel panel 8, a fire-resistant layer 7, and a protective steel panel 8; both the inner and outer protective steel panels 8 are made of 0.5mm galvanized steel plates). The finished duct is assembled on-site using H-shaped inserts, and the overall duct structure meets the 2.0h fire resistance limit requirement.

[0104] Example 5:

[0105] The difference from Embodiment 1 is that, as Figures 11 to 15As shown, a nut 9 is provided to match the self-tapping screw 1 at the vertical base plate 5 of the air duct. The nut 9 is located on the outside of the air duct and is matched with the end of the shank of the self-tapping screw 1. The head of the self-tapping screw 1 at the vertical base plate 5 of the air duct is located on the inside of the air duct. The head of the self-tapping screw 1 at the horizontal base plate 3 of the air duct is located on the outside of the air duct. Both the vertical base plate 5 and the horizontal base plate 3 of the air duct are provided with a marking layer 10 to mark the installation point of the self-tapping screw 1.

[0106] The stacking method for the vertical base plate 5 and horizontal base plate 3 of the integrated air duct before transportation is as follows:

[0107] First, drive a self-tapping screw 1 into the marking layer 10 on a certain vertical duct substrate 5 or horizontal duct substrate 3 that needs to be stacked. Put a nut 9 on the part of the self-tapping screw 1 that extends beyond the vertical duct substrate 5 or horizontal duct substrate 3 to prevent the pointed part of the self-tapping screw 1 from touching the adjacent vertical duct substrate 5 or horizontal duct substrate 3. Share one nut 9 for every two adjacent vertical duct substrates 5 or horizontal duct substrates 3.

[0108] The thread inside the nut 9 is a bidirectional internal thread, that is, there are two internal thread sections with opposite directions on the inner side wall of the nut 9, and a smooth section 13 is provided between adjacent internal thread sections to widen the length of the thread to accommodate the tips of two adjacent self-tapping screws 1.

[0109] Then, self-tapping screws 1 are also driven into the marking layer 10 on the vertical base plate 5 or horizontal base plate 3 of the adjacent block, and the part of the self-tapping screws 1 that extends beyond the vertical base plate 5 or horizontal base plate 3 of the duct is threaded to the aforementioned nut 9.

[0110] Taking advantage of the fact that the jack-shaped connection structure during installation needs to be used with self-tapping screws 1, the self-tapping screws 1 are driven into the marked points (corresponding to the self-tapping screw 1 installation points during subsequent installation) before transportation. The part of the self-tapping screw 1 that extends beyond the duct substrate is covered with a long nut 9 to prevent the pointed part of the self-tapping screw 1 (i.e., the end of its shank) from hitting the adjacent duct substrate. Furthermore, duct substrates of the same size and specifications are stacked and transported. During stacking, the adjacent duct substrates will not bump into each other due to the setting of the long nut 9, and there is no need to place a pad (or padding paper, etc.) between the adjacent duct substrates during the stacking process before transportation.

[0111] The original pre-transport stacking process remains unchanged. Instead of placing pads, the original method of using self-tapping screws 1 and connecting long nuts 9 is replaced. This method ensures better alignment during stacking and keeps the pre-transport workload almost the same. However, it provides better protection for the duct substrate compared to using pads, and it also reduces the likelihood of the duct substrate shifting during transport (as the self-tapping screws 1 and long nuts 9 restrict the freedom of movement of the duct substrate). The step of covering the edges of the duct substrate with protective material can be omitted because the combination of self-tapping screws 1 and long nuts 9 makes it difficult for the duct substrate to shift during transport. Therefore, during the pre-transport stacking process, it is only necessary to stack adjacent duct substrates with a small gap (the gap can be the same as the thickness of the original protective material covering the edges of the duct substrate).

[0112] Furthermore, since the long nuts 9 are spaced between adjacent duct substrates and between adjacent stacks of duct substrates (meaning between each stack), it is easier to pick up and put down the duct substrates (because there is a certain gap between adjacent duct substrates, which is the thickness of the long nuts 9 (the thickness of a single or two long nuts 9); and the gap between stacks is the thickness of the original protective material covering the edge of the duct substrate).

[0113] After the duct substrate is assembled into a duct on site, the self-tapping screws 1 on the substrate (i.e., the vertical substrate 5 of the duct) which serves as the height of the rectangular frame duct are driven in from the inside to the outside of the duct, not from the outside to the inside. The exposed tip of the self-tapping screw 1 on the outside of the duct engages with the long nut 9. The long nut 9 can also be used as a lifting component for hoisting (of course, a better way is to fix or integrally set a lifting ring on the long nut 9; or to set a smooth rod section 11 and an annular groove section 12 on the tip side surface of the self-tapping screw 1 to prevent the lifting rope from directly contacting the thread of the self-tapping screw 1 during hoisting, and also to prevent the long nut 9 from falling off when the lifting rope contacts the long nut 9 during hoisting; wherein, the smooth rod section 11 and the groove section 12 The self-tapping screw 1 is arranged sequentially from the end of its shank towards its head; the smooth shank section 11 is spaced a certain distance from the end of the shank of the self-tapping screw 1. This arrangement satisfies the needs of hoisting while hardly affecting the self-tapping characteristic of the self-tapping screw 1 itself. Because the smooth shank section 11 is spaced a certain distance from the end of the shank of the self-tapping screw 1, the end of the shank of the self-tapping screw 1 still has the self-tapping characteristic when it is driven into the duct substrate. Although the outer diameter of the smooth shank section 11 and the groove section 12 is smaller than the thread outer diameter of the self-tapping screw 1 as the self-tapping screw 1 penetrates deeper into the duct substrate, the previously formed screw hole continues to be formed as the shank end penetrates further. Therefore, this arrangement does not affect the self-tapping characteristic of the self-tapping screw 1.

[0114] This method utilizes the long nut 9 from transportation for subsequent hoisting operations. After transportation, the long nut 9 and self-tapping screw 1 can be removed from the base plate (i.e., the shorter base plate, i.e., the vertical base plate 5 of the duct) which serves as the height of the rectangular frame duct. The base plate (i.e., the vertical base plate 5 of the duct) and the base plate (i.e., the horizontal base plate 3 of the duct) which serves as the length of the rectangular frame duct are then connected using a U-shaped connection structure. Finally, self-tapping screw 1 is driven into the base plate (i.e., the vertical base plate 5 of the duct) which serves as the height of the rectangular frame duct. The screw 1 is driven in from the inside to the outside of the duct. The duct base plate is fixedly connected to the jack-shaped connector 2 by the self-tapping screw 1. The exposed tip of the self-tapping screw 1 on the outside of the duct is then threaded to the long nut 9. The long nut 9 (or a lifting ring is fixed or integrally set on the long nut 9) is used as a lifting component for hoisting. Then, the self-tapping screw 1 is driven into the base plate, which is the length of the rectangular frame duct (here, the self-tapping screw 1 is driven in from the outside to the inside of the duct). When the four duct base plates, namely the two horizontal duct base plates 3 and the two vertical duct base plates 5, are respectively connected to the jack-shaped connectors 2 at the four corners by the self-tapping screw 1 to form a rectangular frame, part of the duct section is assembled on site. Then, the duct sections are spliced ​​together according to the existing technology to form the duct (the duct base plate is also called the duct splicing component).

[0115] Example 6:

[0116] The difference from Embodiment 1 is that, as Figures 16 to 22As shown, the end faces of the horizontal duct substrate 3 and the vertical duct substrate 5 are provided with rectangular annular protrusions 15 or rectangular annular grooves 16 for connecting adjacent duct sections (that is, for inserting and connecting adjacent horizontal and vertical duct substrates). A glue storage tank 17 is provided on the surface of the horizontal duct substrate 3 and the vertical duct substrate 5 near the protrusion or groove, located above the groove 16. The groove 16 and the glue storage tank 17 are connected. The protrusion and the groove are matched. A glue storage bag 18 is provided inside the glue storage tank. The glue storage bag 18 is sealed and contains adhesive. The opening of the glue storage bag... The sealing loop 19 is located below the storage bag and its opening is sealed. A connecting rope 20 is fixedly connected to the sealing loop 19. The end of the connecting rope 20 away from the loop is wound around a fixed pulley. The fixed pulley is located directly below the marking layer 10 closest to the edge. The wheel body 21 of the fixed pulley is fixedly connected to the axle 22. The axle 22 is slidably connected to the bottom wall of the slot 23 (the horizontal or vertical base plate of the air duct has a slot for accommodating the fixed pulley, and a compression spring 24 is installed in the slot). The lower end of the axle has an outward flange, and the opening of the slot has an inward flange. The axle has a blind hole 25 on its end face facing the self-tapping screw, which is adapted to the self-tapping screw. When the self-tapping screw 1 is driven a certain distance and contacts the axle 22 of the fixed pulley, it drives the fixed pulley to rotate. At the same time, the axle moves downward (the compression spring 24 is further compressed). When the fixed pulley rotates, the connecting rope is wound around the fixed pulley (during this process, the slip is pulled open and the adhesive flows out). Of course, the operation procedure of this solution is slightly different from the conventional procedure. First, the adjacent horizontal or vertical base plates of the air duct used for splicing are spliced ​​together, and then the self-tapping screw 1 is driven in to realize the horizontal base of the air duct. The plate 3 or the vertical base plate 5 of the duct is connected to the jack-shaped connection structure; for the vertical base plate of the duct, the glue storage tank is on one side of the groove, and when it is not spliced ​​and installed and the self-tapping screw is not driven in, the sliding buckle 19 on the glue storage bag in the glue storage tank is at the top. After the self-tapping screw is driven in, the sliding buckle slides down to allow the adhesive to flow out gradually. The wheel body 21 can be provided with a wheel groove to prevent the connecting rope from falling off the wheel body and no longer being wrapped around the fixed pulley (of course, the horizontal base plate or the vertical base plate of the duct is also provided with a channel 26 for accommodating the scaling path of the connecting rope, and the channel 26 is connected to the slot).

[0117] Drawing inspiration from the technology of vacuum compression bags for bedding, this invention achieves airtightness during duct fabrication (i.e., when the duct substrates are connected into a rectangular frame duct using a T-shaped connection structure), reducing manual labor and connecting duct sections simultaneously with the insertion of self-tapping screws. Furthermore, it maintains ease of assembly; in terms of fabrication, it is simple and quick, with a construction speed still approaching 60 square meters per person.

[0118] The fire resistance rating requirements for smoke exhaust ducts of different types and locations are as follows:

[0119]

[0120]

[0121] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An integrated duct using a jack-shaped connection structure for magnesium inorganic refractory ducts, characterized in that: It consists of a horizontal duct base plate, a vertical duct base plate, and a pincer-shaped connection structure; both the horizontal and vertical duct base plates include a fire-resistant and heat-insulating layer, which is made of magnesium inorganic fire-resistant layer. The horizontal or vertical base plate of the duct also includes a protective steel panel installed outside the fire-resistant layer, or the horizontal or vertical base plate of the duct also includes a highly corrosion-resistant metal plate installed on both the inner and outer sides of the fire-resistant layer. The jin-shaped connection structure consists of self-tapping screws and an integral jin-shaped connector. The jin-shaped connector includes a first part that is adapted to the horizontal base plate of the air duct and a second part that is adapted to the vertical base plate of the air duct. The first part is in the shape of a channel steel, and the second part is composed of two parallel plates. Both parallel plates are fixedly connected to the first part, and one of the plates is coplanar with the bottom wall of the channel steel-shaped first part. The fire-resistant layer is 10-20mm thick, and the protective steel panel is a color steel plate, a metal aluminum protective layer, or a galvanized steel plate, with a thickness of 0.16-0.5mm; the duct horizontal base plate and the duct vertical base plate are each provided in two pieces; the jack-shaped connection structure is provided in four pieces; The self-tapping screws on the vertical base plate of the duct are fitted with nuts. The nuts are located on the outside of the duct and are fitted with the end of the shank of the aforementioned self-tapping screws. The head of the self-tapping screws on the vertical base plate of the duct is located on the inside of the duct. The head of the self-tapping screws on the horizontal base plate of the duct is located on the outside of the duct. Both the vertical and horizontal base plates of the duct are equipped with marking layers to mark the installation points of the self-tapping screws. The stacking method for the vertical and horizontal base plates of the integrated air duct before transportation is as follows: First, drive self-tapping screws into the marking layer on a certain vertical or horizontal duct substrate that needs to be stacked. Put a nut on the part of the self-tapping screw that extends beyond the vertical or horizontal duct substrate to prevent the pointed part of the self-tapping screw from touching the adjacent vertical or horizontal duct substrate. Share one nut for every two adjacent vertical or horizontal duct substrates. Then, self-tapping screws are also driven into the marking layer on the vertical or horizontal base plate of the duct in the adjacent block, and the part of the self-tapping screw that extends beyond the vertical or horizontal base plate of the duct is threaded to the aforementioned nut. A smooth section and an annular groove section are provided on the tip side surface of the self-tapping screw; wherein, the smooth section and the groove section are arranged sequentially from the end of the self-tapping screw shank towards the head; the smooth section is spaced at a certain distance from the end of the self-tapping screw shank.

2. The integrated duct with a zigzag connection structure using magnesium inorganic refractory duct as described in claim 1, characterized in that, The jin-shaped connector is a jin-shaped light steel angle keel, made of hot-dip galvanized sheet; the high corrosion-resistant metal plate is anti-corrosion aluminum foil.

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