A node structure for a duct to cross a fire wall

Abstract

The utility model discloses a kind of node structure of air pipe crossing fireproof partition, it is related to air pipe wall penetration construction technical field. Including fire-resistant rigid sleeve, fireproof layer and bracing structure, wherein, fire-resistant rigid sleeve is passed through in through-hole, and it is sleeved on the outside of air pipe, first fireproof gap is formed between fire-resistant rigid sleeve and air pipe, second fireproof gap is formed between fire-resistant rigid sleeve and fireproof partition, fireproof layer includes first fireproof layer and second fireproof layer, first fireproof layer and second fireproof layer are all selected fireproof heat-insulating material, first fireproof layer is filled in first fireproof gap, second fireproof layer is filled in second fireproof gap, bracing structure is used to fix the relative position of air pipe and fire-resistant rigid sleeve. The utility model is through systematic, composite design, guarantee to meet the prerequisite of four hours fire resistance limit, effectively block the transmission of heat to air pipe wall, prevent air pipe deformation failure, protect the gap sealing system between air pipe and wall from high temperature direct influence.

Description

Technical Field

[0001] This utility model relates to the field of duct penetration construction technology, specifically a node structure for duct penetration through fireproof partition walls. Background Technology

[0002] In a fire, unprotected or improperly protected air ducts can become channels for the rapid spread of fire and high-temperature smoke between fire compartments. Flames and heat can spread from one side of the fire to the other through gaps in the air duct itself or around it, potentially igniting combustibles on the unexposed side and causing "indirect ignition".

[0003] Currently, there are two fire-resistant construction methods:

[0004] A simple filling method involves using non-combustible flexible insulation materials or fireproof putty to fill the gaps between the duct and the wall. For example, patent application number 202311295769.6 describes injecting fireproof putty into the cavity between the ventilation duct unit and the firewall, then applying cement mortar to seal the putty. While this method provides some fire protection, the materials are prone to cracking and pulverizing under prolonged high temperatures, failing to maintain their integrity. They cannot compensate for the displacement between the duct and the wall due to thermal deformation, and will quickly become ineffective.

[0005] Some people install only ordinary fire dampers, believing that this will solve the problem. However, fire dampers can only block fire and smoke passing through the duct, but they cannot prevent the duct itself from being damaged at high temperatures or the heat from being conducted through the duct wall. Flames and high temperatures can completely bypass fire dampers and spread by burning through the duct wall or damaging its connection to the wall.

[0006] At the same time, neither of the above two methods can meet the four-hour fire resistance limit requirement. Utility Model Content

[0007] The purpose of this utility model is to provide a node structure for air ducts passing through fireproof partitions, so as to solve the technical problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a node structure for a duct passing through a fireproof partition wall, comprising a fire-resistant rigid sleeve, a supporting structure, and a fireproof layer, wherein the fire-resistant rigid sleeve passes through a through hole and is fitted onto the outside of the duct, forming a first fireproof gap between the fire-resistant rigid sleeve and the duct, and forming a second fireproof gap between the fire-resistant rigid sleeve and the fireproof partition wall, the fireproof layer comprising a first fireproof layer and a second fireproof layer, both the first and second fireproof layers being made of fire-resistant and heat-insulating materials, and the first fireproof layer filling the first fireproof gap, the second fireproof layer filling the second fireproof gap, and the supporting structure being used to fix the relative position of the duct and the fire-resistant rigid sleeve.

[0009] Based on the above technical features, this utility model installs a fire-resistant rigid sleeve on the outside of the duct, fills the space between the duct and the fire-resistant rigid sleeve with a first fireproof layer, and fills the space between the fireproof partition and the fire-resistant rigid sleeve with a second fireproof layer. Simultaneously, the relative positions of the duct and the fire-resistant rigid sleeve are fixed by a supporting structure, ultimately constructing a reliable fire barrier with structural stability. This breaks through the traditional simple sealing mindset. Through a systematic and composite design, it transforms the "passive sealing" concept of simply sealing gaps to prevent the passage of fire and smoke into an "active protection" concept that actively dresses the duct in a fireproof and heat-insulating layer to meet the four-hour fire resistance limit requirement. While ensuring the four-hour fire resistance limit is met, it effectively blocks the transfer of heat to the duct wall, prevents duct deformation and failure, and protects the gap sealing system between the duct and the wall from direct high-temperature effects.

[0010] Preferably, in this technical solution, the fire-resistant rigid sleeve includes four fireproof boards and four L-shaped light steel keels. The four fireproof boards are spliced ​​together end to end, and the L-shaped light steel keels and screws are used to fix them at the inner corners of the spliced ​​fireproof boards, and they are combined to form a fire-resistant rigid sleeve with a rectangular cross-section.

[0011] Based on the above technical features, the fireproof board is made of fire-resistant materials. When exposed to fire, a heat insulation layer is formed on the surface. With the support of the metal keel, it effectively blocks the spread of flames and provides physical protection for the internal first fireproof layer and air duct, preventing damage to the fireproof layer structure from minor daily collisions or system vibrations.

[0012] Preferably, in this technical solution, the fireproof board is made of calcium silicate board, and the thickness of the selected calcium silicate board is 11mm to 13mm. More preferably, fireproof adhesive is applied to the joints of the fireproof boards.

[0013] Based on the above technical characteristics, calcium silicate board with excellent fire resistance, environmental protection and stability is selected as the fireproof board, and fireproof adhesive is applied to the joints between them, so that the joint structure can more effectively block the spread of fire and meet the four-hour fire resistance limit requirement.

[0014] In this technical solution, the node structure preferably includes an annular sleeve, which is lined inside the through hole of the fireproof partition wall; the through hole is rectangular, and the annular sleeve is formed by welding four steel plates together.

[0015] In this technical solution, preferably, the first fireproof gap between the fireproof board and the air duct is 48mm to 52mm; a second fireproof gap is formed between the fire-resistant rigid sleeve and the annular sleeve, and the second fireproof gap is no greater than 20mm.

[0016] Preferably, in this technical solution, both the first fireproof layer and the second fireproof layer are made of fireproof rock wool. The first fireproof layer is filled in the first fireproof gap, and the second fireproof layer is filled in the second fireproof gap formed between the fire-resistant rigid sleeve and the annular sleeve.

[0017] Preferably, in this technical solution, the supporting structure includes a hanger and a U-shaped light steel keel. The hanger includes a hanger rod and a support frame. The support frame is installed between the air duct and the bottom fireproof board. One end of the hanger rod is fixed to the bottom of the floor slab, and the other end passes through a fire-resistant rigid sleeve and is connected to the support frame. The U-shaped light steel keel is installed between the air duct and the bottom fireproof board. The air duct is placed on the U-shaped light steel keel and the support frame, and both the U-shaped light steel keel and the support frame are used to support the air duct.

[0018] In this technical solution, preferably, the surfaces of the fire-resistant rigid sleeve and the hanger are coated with fire-retardant paint.

[0019] Preferably, in this technical solution, the duct is made of galvanized steel sheet or stainless steel sheet. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the node structure in an embodiment of the present invention;

[0021] Figure 2 As an embodiment of this utility model Figure 1 A schematic diagram of the structure at point A in the middle.

[0022] In the diagram: 1. Fireproof partition wall; 101. Through hole; 2. Air duct; 3. Fire-resistant rigid sleeve; 301. Fireproof board; 302. L-shaped light steel keel; 303. Screw; 304. Fireproof adhesive; 4. Fireproof layer; 401. First fireproof layer; 402. Second fireproof layer; 5. Support structure; 501. Hanger; 502. Support frame; 503. U-shaped light steel keel; 6. Annular sleeve. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] It should be noted that in the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be discussed or described in detail in the description of the subsequent figures.

[0027] Furthermore, before understanding the technical solution of this utility model, it is important to understand that the fireproof partition wall 1 has through holes 101 extending through both sides. When the air duct 2 passes through these through holes 101, a weak point is created. Improper handling at this point can completely destroy the fireproof, heat-insulating, and smoke-blocking properties of the fireproof partition wall 1. Simultaneously, the first fireproof layer 401, located within the first fireproof gap between the fire-resistant rigid sleeve 3 and the air duct 2, is not properly protected because it is situated within the through holes 101. Figure 1 and Figure 2 As shown in the figure.

[0028] like Figures 1 to 2As shown, this utility model provides a technical solution: a node structure for a duct passing through a fireproof partition wall, including a fire-resistant rigid sleeve 3, a fireproof layer 4, a supporting structure 5, and an annular sleeve 6. The fire-resistant rigid sleeve 3 passes through the through hole 101 and is sleeved on the outside of the duct 2, forming a first fireproof gap between the fire-resistant rigid sleeve 3 and the duct 2, and a second fireproof gap between the fire-resistant rigid sleeve 3 and the fireproof partition wall 1. The fireproof layer 4 includes a first fireproof layer 401 and a second fireproof layer 402, both of which are made of fire-resistant and heat-insulating materials. The first fireproof layer 401 fills the first fireproof gap, and the second fireproof layer 402 fills the second fireproof gap. The supporting structure 5 is used to fix the relative position of the duct 2 and the fire-resistant rigid sleeve 3. The annular sleeve 6 is lined inside the through hole 101 of the fireproof partition wall 1.

[0029] like Figure 1 The node structure shown includes a fire-resistant rigid sleeve 3 fitted over the outside of the duct 2, with a first fireproof layer 401 filled between the duct 2 and the fire-resistant rigid sleeve 3, and a second fireproof layer 402 filled between the fireproof partition wall 1 and the fire-resistant rigid sleeve 3. Simultaneously, the relative positions of the duct 2 and the fire-resistant rigid sleeve 3 are fixed by the provided support structure 5. Specifically, at the through hole 101, from the inside out, the structure includes the duct 2, the first fireproof layer 401, the fire-resistant rigid sleeve 3, the second fireproof layer 402, and the annular sleeve 6, ultimately constructing a reliable fire barrier with structural stability. Breaking away from the traditional simple sealing mindset, it forms a synergistic fire prevention effect of "1+1>2". By adopting a systematic and composite design, it has transformed from the "passive sealing" concept of simply sealing gaps to prevent the passage of fire and smoke to the "active protection" concept of actively dressing duct 2 with a layer of fireproof and heat-insulating clothing to meet the four-hour fire resistance limit requirement. Under the premise of ensuring that the four-hour fire resistance limit is met, it effectively blocks the transfer of heat to duct 2, prevents duct 2 from deforming and failing, and protects the gap sealing system between duct 2 and fireproof partition 1 from the direct impact of high temperature.

[0030] Specifically, such as Figure 1 and Figure 2 As shown, the fire-resistant rigid sleeve 3 includes four fireproof boards 301 and four L-shaped light steel keels 302. The four fireproof boards 301 are sequentially spliced ​​together end-to-end, and fixed at the inner corners of the spliced ​​fireproof boards 301 using L-shaped light steel keels 302 and screws 303, forming a rectangular cross-section fire-resistant rigid sleeve 3. Fire-retardant adhesive 304 is applied to the gaps between the spliced ​​fireproof boards 301 to effectively seal the joints. The fireproof boards 301 are made of fire-resistant material, forming a heat-insulating layer on their surface when exposed to fire. Combined with the support of the metal keels, this effectively prevents the spread of flames while also providing physical protection for the internal first fireproof layer 401 and the air duct 2, preventing damage to the fireproof layer structure from minor daily impacts or system vibrations.

[0031] Furthermore, fireproof board 301 is made of calcium silicate board, and the thickness of the selected calcium silicate board is 11mm to 13mm. The specific thickness can be 11mm, 12mm, 13mm, or any thickness between two adjacent specific thickness values.

[0032] In this invention, the through hole 101 on the fireproof partition wall 1 is rectangular, and the annular sleeve 6 is formed by welding four steel plates together to ensure that the weight of the wall does not directly act on the air duct 2. Preferably, the annular sleeve 6 is formed by welding four 2mm thick steel plates together.

[0033] Furthermore, the first fireproof gap between the fireproof board 301 and the air duct 2 is 48mm to 52mm, meaning that a first fireproof layer 401 with a thickness of 48mm to 52mm is tightly wrapped between the fireproof board 301 and the air duct 2. The specific thickness can be 48mm, 49mm, 50mm, 51mm, or 52mm, or any thickness between two adjacent specific thickness values. A second fireproof gap is formed between the fire-resistant rigid sleeve 3 and the annular sleeve 6, and the second fireproof gap is no greater than 20mm, meaning that a second fireproof layer 402 with a thickness of no more than 20mm is tightly wrapped between the fire-resistant rigid sleeve 3 and the annular sleeve 6. Preferably, both the first fireproof layer 401 and the second fireproof layer 402 can be made of fireproof rock wool. Of course, under other conditions, fireproof mineral wool can also be used as the fireproof layer.

[0034] In a specific embodiment of this utility model, the duct 2 is made of galvanized steel plate or stainless steel plate, and the specific dimensions of the duct 2 and the thickness of the steel plate are in accordance with the design requirements. The fireproof board 301 is a 4.5m long, 12mm thick fiber-reinforced calcium silicate board, extending approximately two meters beyond the fireproof partition wall on both sides. The upper and lower sides where the extended fireproof board 301 intersects with the fireproof partition wall 1 are reinforced with light steel keel and self-tapping screws. The physical properties of the selected fiber-reinforced calcium silicate board are: density 1.5g / cm³. 3The fireproof board 301 is non-combustible (A1 grade), with a moisture expansion rate ≤0.25%, screw holding force ≥80N / mm, flexural strength ≥10MPa, and thermal conductivity 0.3W / (m·K). L-shaped light steel keel 302, using self-tapping screws with a nominal diameter of 200mm, supports and fixes the spliced ​​fireproof board 301, ensuring its structural stability in high-temperature environments. The L-shaped light steel keel 302 must be tightly fitted to the first fireproof layer 401. The cross-sectional dimensions of the L-shaped light steel keel 302 are 40mm*40mm*4mm. Fireproof adhesive 304, 2mm thick, is applied to the seams between the boards. The first fireproof layer 401 is made of 50mm thick fireproof rock wool board and is filled into the first fireproof joint. The second fireproof layer 402 is also made of the same material and is filled and sealed into the second fireproof joint formed between the fire-resistant rigid sleeve 3 and the annular sleeve 6. The physical properties of the selected rock wool insulation material are: linear shrinkage rate ≤4% (ensuring dimensional stability at high temperatures), maximum service temperature 800℃, melting point: 1160℃, and density 140kg / m³. 3 It has a thermal conductivity of 0.038 W / (m·K) and a hydrophobicity of 99.6%.

[0035] like Figure 1 As shown, the supporting structure 5 includes a hanger and a U-shaped light steel keel 503. The hanger includes a hanger rod 501 and a support frame 502. The support frame 502 is installed between the air duct 2 and the bottom fireproof board 301. One end of the hanger rod 501 is fixed to the bottom of the floor slab, and the other end passes through the fire-resistant rigid sleeve 3 and is connected to the support frame 502. The U-shaped light steel keel 503 is installed between the air duct 2 and the bottom fireproof board 301. The air duct 2 is placed on the U-shaped light steel keel 503 and the support frame 502, both of which support the air duct 2. Preferably, the surfaces of the fire-resistant rigid sleeve 3 and the hanger rod 501 are coated with fire-retardant paint to improve the fire resistance rating. The selected hanger rod 501 has the same fire resistance rating as the air duct 2.

[0036] This utility model has the following beneficial effects:

[0037] 1. Ensure the integrity of the four-hour fire resistance limit: effectively prevent flames and high-temperature smoke from spreading to another fire compartment through the weak points of duct 2 within a short period of time (within 4 hours);

[0038] 2. Excellent thermal insulation performance: The external wrapping materials such as rock wool are excellent thermal insulation layers, which can greatly slow down the heat conduction process and ensure that the surface temperature of the air duct 2 on the unexposed side does not exceed the critical value (usually 180℃) within the time required by the specification (such as 4 hours).

[0039] 3. Maintaining structural stability: The external fireproof wrapping provides thermal insulation protection for duct 2, keeping its core temperature at a low level during the duration of the fire, thereby ensuring the structural stability of duct 2 itself and avoiding secondary disasters caused by duct 2 softening, twisting, and collapsing at high temperatures.

[0040] 4. Possesses a certain degree of resistance to mechanical impact and vibration: The fire-resistant rigid sleeve 3 (calcium silicate board outer cover) can provide physical protection for the internal flexible sealing (fireproof rock wool installed inside the fireproof layer) and air duct 2, preventing minor daily collisions or system vibrations from damaging the fireproof sealing structure.

[0041] 5. High system reliability and strong fault tolerance: This "multiple protection" concept means that even if a minor flaw occurs in one of the internal defense lines (such as flexible sealing materials), the external wrapping layer can still provide an effective fire barrier, greatly improving the safety redundancy of the entire node structure.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A node structure for a duct passing through a fireproof partition wall, wherein the fireproof partition wall (1) is provided with through holes (101) penetrating both sides, and the duct (2) passes through the through holes (101), characterized in that, Node construction includes: Fire-resistant rigid sleeve (3), the fire-resistant rigid sleeve (3) passes through the through hole (101) and is sleeved on the outside of the air duct (2), the fire-resistant rigid sleeve (3) and the air duct (2) form a first fireproof gap, and the fire-resistant rigid sleeve (3) and the fireproof partition (1) form a second fireproof gap. Fireproof layer (4), the fireproof layer (4) includes a first fireproof layer (401) and a second fireproof layer (402), the first fireproof layer (401) and the second fireproof layer (402) are both made of fire-resistant and heat-insulating materials, and the first fireproof layer (401) is filled in the first fireproof gap, and the second fireproof layer (402) is filled in the second fireproof gap; Support structure (5) is used to fix the relative position of the air duct (2) and the fire-resistant rigid sleeve (3).

2. The node structure for a duct penetrating a fireproof partition wall as described in claim 1, characterized in that, The fire-resistant rigid sleeve (3) includes four fireproof boards (301) and four L-shaped light steel keels (302); wherein, Four fireproof boards (301) are spliced ​​together end to end. At the inner corner of the spliced ​​fireproof boards (301), L-shaped light steel keel (302) and screws (303) are used to fix them and combine them into a fire-resistant rigid sleeve (3) with a rectangular cross-section.

3. The node structure for a duct penetrating a fireproof partition wall as described in claim 2, characterized in that, The fireproof board (301) is made of calcium silicate board, and the thickness of the selected calcium silicate board is 11mm to 13mm.

4. The node structure for a duct penetrating a fireproof partition wall as described in claim 3, characterized in that, The fireproof board (301) is coated with fireproof adhesive (304) at the joints between the boards.

5. The node structure for a duct penetrating a fireproof partition wall as described in claim 3, characterized in that, It also includes an annular sleeve (6), which is lined inside the through hole (101) of the fireproof partition wall (1); The through hole (101) is rectangular, and the annular sleeve (6) is formed by welding four steel plates together.

6. The node structure for a duct penetrating a fireproof partition wall as described in claim 5, characterized in that, The first fireproof gap between the fireproof board (301) and the air duct (2) is 48mm to 52mm; a second fireproof gap is formed between the fire-resistant rigid sleeve (3) and the annular sleeve (6), and the second fireproof gap is no more than 20mm.

7. The node structure for a duct penetrating a fireproof partition wall as described in claim 6, characterized in that, Both the first fireproof layer (401) and the second fireproof layer (402) are made of fireproof rock wool, wherein, The first fireproof layer (401) is filled in the first fireproof gap, and the second fireproof layer (402) is filled in the second fireproof gap formed between the fire-resistant rigid sleeve (3) and the annular sleeve (6).

8. The node structure for a duct penetrating a fireproof partition wall as described in claim 2, characterized in that, The supporting structure (5) includes a hanger and a U-shaped light steel keel (503), wherein, The hanger includes a hanger rod (501) and a support frame (502). The support frame (502) is installed between the air duct (2) and the bottom fireproof board (301). One end of the hanger rod (501) is fixed to the bottom of the floor slab, and the other end passes through the fire-resistant rigid sleeve (3) and is connected to the support frame (502). The U-shaped light steel keel (503) is installed between the air duct (2) and the bottom fireproof board (301); the air duct (2) is placed on the U-shaped light steel keel (503) and the support frame (502), and the U-shaped light steel keel (503) and the support frame (502) are both used to support the air duct (2).

9. The node structure for a duct penetrating a fireproof partition wall as described in claim 8, characterized in that, The surfaces of the fire-resistant rigid sleeve (3) and the hanger (501) are coated with fire-retardant paint.

10. A node structure for a duct penetrating a fireproof partition wall according to claim 9, characterized in that, The air duct (2) is made of galvanized steel plate or stainless steel plate.

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