Low-energy-consumption steel structure building special part heat insulation thermal bridge joint and manufacturing method

Abstract

The application provides a low-energy-consumption steel structure building special part heat preservation heat insulation bridge node and a manufacturing method, the body of the C-shaped angle steel is fixed with the front end of the main keel and is covered by the heat preservation layer, the interval b between the front end of the main keel and the heat preservation layer is greater than or equal to 1.5d, b is determined according to the actual situation, the front end of the C-shaped angle steel is fixed with the tail end of the secondary keel and is covered by the heat preservation layer, the interval a between the tail end of the C-shaped angle steel and the heat preservation layer is greater than or equal to 1.5d, a is determined according to the actual situation, and is determined according to the heat loss from the indoor to the outdoor direction. Advantages: the original single keel support structure is changed into a support structure combined by the main keel and the secondary keel, they are separated by the heat insulation pad and are fixed by the bolt, and the purpose of forming the heat insulation bridge is achieved. The number of heat bridge points is reduced, the heat loss at the single main keel node is reduced, and finally the heat bridge value of the whole building is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of thermal insulation bridge joints, and in particular to a thermal insulation bridge joint and its manufacturing method for a special part of a low-energy steel structure building. Background Technology

[0002] Thermal bridge-free design is one of the five key technical aspects of low-energy buildings.

[0003] The traditional approach to building curtain wall support systems involves connecting the aluminum panels that make up the curtain wall to the main building structure via main and secondary joists. However, the main joists need to penetrate the insulation layer of the building's exterior wall, creating point thermal bridges and causing energy loss. (See reference for details.) Figure 1 .

[0004] However, the existing construction methods for the main keel of steel structure building curtain walls can create the aforementioned point thermal bridges at these locations, resulting in energy loss and the risk of condensation. Based on the examples above, the cumulative heat loss caused by these multiple point thermal bridges has a significant impact on building energy consumption.

[0005] In summary, how to provide a method for thermal bridging at the main keel of the curtain wall support structure, which can reduce the number of point thermal bridges at the connection between the main keel and the secondary keel, has become an urgent problem to be solved. Summary of the Invention

[0006] This invention provides thermal insulation bridge nodes and manufacturing methods for special parts of low-energy steel structure buildings, which solves the problem of high heat loss of the overall building structure caused by multiple point thermal bridges at the main keel of the curtain wall support structure.

[0007] To achieve the above objectives, the present invention provides a thermal insulation bridge node for special parts of low-energy steel structure buildings, including an I-beam, an insulation layer, an aluminum plate, and further comprising: a main keel, a secondary keel, a C-shaped angle steel, and steel components. The body of the C-shaped angle steel is fixed to the front end of the main keel and covered by the insulation layer, with a distance b ≥ 1.5d between the front end of the main keel and the insulation layer. The front end of the C-shaped angle steel extends from the front of the insulation layer and is fixedly connected to the end of the secondary keel, with the end of the C-shaped angle steel also covered by the insulation layer. The front end of the secondary keel is provided with a steel component fixedly connected to the aluminum plate. The end of the main keel is fixed to the I-beam by bolts; wherein, d = bolt diameter + 2mm.

[0008] As a preferred embodiment of the above technical solution, preferably, the distance a between the end of the C-shaped angle steel and the insulation layer is ≥1.5d.

[0009] As a preferred embodiment of the above technical solution, a heat insulation pad is sandwiched between the C-shaped angle steel and the main keel, and the three are fixed together by bolts.

[0010] As a preferred embodiment of the above technical solution, the C-shaped angle steel and the heat insulation pad are arranged symmetrically with the main keel as the axis. Specifically, the arrangement sequence is: C-shaped angle steel - heat insulation pad - main keel - heat insulation pad - C-shaped angle steel, and the above structural components are fixed together with bolts.

[0011] As a preferred embodiment of the above technical solution, preferably, d = bolt diameter + 2mm.

[0012] As a preferred embodiment of the above technical solution, the connection between the front end of the C-shaped angle steel and the secondary keel, and the connection between the secondary keel and the steel component, are both fixed by welding.

[0013] As a preferred embodiment of the above technical solution, the gap between the main keel and the wall is coated with silicone sealant and covered with a waterproof and vapor-proof membrane, and the gap between the main keel and the insulation layer is filled with polyurethane foam.

[0014] This invention also provides a method for fabricating thermal insulation bridge nodes in special parts of low-energy steel structure buildings that can achieve the above-mentioned node structure, including: obtaining the average heat transfer coefficient of the path where the main keel is located from indoors to outdoors. Obtain the average heat transfer coefficient along the path of the C-shaped angle steel from indoors to outdoors. .according to Obtain the distance b between the front end of the main keel and the insulation layer; according to Obtain the distance 'a' between the end of the C-shaped angle steel and the insulation layer; where a+b≥3d and a≥1.5d, b≥1.5d.

[0015] As a preferred embodiment of the above technical solution, preferably, according to The distance 'b' between the front end of the main keel and the insulation layer is obtained from the cross-section. Specifically:

[0016]

[0017]

[0018]

[0019] Make The minimum value yields the spacing b; Internal surface heat transfer resistance [㎡·K / W]; External surface heat transfer resistance [㎡·K / W]; This refers to the thickness of the insulation layer; The average heat transfer coefficient of the main keel and the insulation layer connected to the main keel; Thermal resistance of the insulation layer at the front end of the main keel [㎡·K / W]; Thermal resistance of the main keel [㎡·K / W].

[0020] As a preferred embodiment of the above technical solution, preferably, according to The distance 'a' between the end of the C-shaped angle steel and the insulation layer is obtained, specifically:

[0021]

[0022]

[0023]

[0024] Make The minimum value yields the spacing 'a'; Internal surface heat transfer resistance [㎡·K / W]; External surface heat transfer resistance [㎡·K / W]; This refers to the thickness of the insulation layer; The average heat transfer coefficient of C-shaped angle steel [W / (㎡•K)]; The average heat transfer coefficient between the end of the C-shaped angle steel and the insulation layer; The thermal resistance of the insulation layer at the end of the C-shaped angle steel [㎡·K / W]; Thermal resistance of the wall [㎡·K / W].

[0025] This invention provides a method for fabricating a thermally insulating bridge node in a special part of a low-energy steel structure building. The body of the C-shaped angle steel is fixed to the front end of the main keel and covered by an insulation layer. The distance b between the front end of the main keel and the insulation layer is ≥ 1.5d, where b is determined according to... It is determined that the heat loss from the main keel to the secondary keel is obtained. The front end of the C-shaped angle steel extends from the front of the insulation layer and is fixed to the end of the secondary keel. The end of the C-shaped angle steel is covered by the insulation layer, and the distance a between the end of the C-shaped angle steel and the insulation layer is ≥ 1.5d, where a is determined according to... The heat loss is obtained based on the heat loss from the secondary keel to the main keel. .

[0026] The advantage of this invention is that the main keel is divided into two parts at the insulation layer, separated by thermal insulation pads and fixed with bolts to form a thermal break bridge. Advantages: By changing the original support structure of a single keel to a support structure composed of main and secondary keels, separated by thermal insulation pads and fixed with bolts, the purpose of forming a thermal break bridge is achieved. This reduces the number of thermal bridge points, reduces heat loss at individual main keel joints, and ultimately significantly reduces the overall thermal bridge value of the building. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below... Figure 2-5 These are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0028] Figure 1 This refers to the prior art solutions described in the background section of this invention.

[0029] Figure 2 This is a schematic diagram of the thermal insulation bridge node in a special part of a low-energy steel structure building, provided in an embodiment of the present invention.

[0030] Figure 3 Structural illustration provided for embodiments of the present invention Figure 2 .

[0031] Figure 4 for Figure 2 A cross-sectional view of the structure along the A-A' direction (enlarged).

[0032] Figure 4a for Figure 2 The diagram shows a cross-sectional view of the structure from above.

[0033] Figure 5 A flowchart illustrating the method for fabricating thermal insulation bridge nodes in special parts of low-energy steel structure buildings, as provided in this embodiment of the invention. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The technical solution of the present invention will now be described in conjunction with the specific accompanying drawings, such as... Figure 2 As shown, Figure 2 The structural schematic diagram provided for the embodiments of the present invention includes: I-beam 1, insulation layer 2, aluminum plate 3, main keel 4, secondary keel 5, C-shaped angle steel 6, and steel component 7.

[0036] Specifically:

[0037] The front end of the C-shaped angle steel 6 extends from the front of the insulation layer 2 and is fixed to the end of the secondary keel 5 by welding. The body of the C-shaped angle steel 6 is fixed to the front end of the main keel 4 and is covered by the insulation layer 2. The end of the C-shaped angle steel 6 is also covered by the insulation layer 2. The main keel 4 penetrates through the wall 8.

[0038] A heat insulation pad is sandwiched between the body of the C-shaped angle steel 6 and the main keel 4. Bolts 11 pass through the C-shaped angle steel 6, heat insulation pad 12, main keel 4, another heat insulation pad, and another C-shaped angle steel 6 in sequence. The above structural components are fixed together by bolts. The C-shaped angle steel 6 and the heat insulation pad are arranged symmetrically about the main keel 4 (e.g., Figure 4 As shown), the end of the main keel 4 is fixed to the I-beam 1 by bolts 11.

[0039] The front end of the secondary keel 5 is welded to the steel component 7, and the steel component 7 is fixedly connected to the aluminum plate 3 of the outer wall.

[0040] The distance between the end of the C-shaped angle steel 6 and the insulation layer 2: a ≥ 1.5d. The distance between the front end of the main keel 4 and the insulation layer 2: b ≥ 1.5d. d = bolt diameter + 2mm, where the diameter of bolt 11 is related to the structural stress condition of the current building. For example... Figure 3 As shown, the bolt spacing 11 on the C-shaped angle steel 6 is 3d.

[0041] The gap 9 between the main keel 4 and the wall 8 is coated with silicone sealant or polyurethane foam and covered with a waterproof and vapor-proof membrane, and the gap 10 between the main keel 4 and the insulation layer 2 is filled with polyurethane foam.

[0042] Furthermore, without affecting the structural stability of the building, through holes can be provided on the main keel 4 to save raw materials, and insulation material can be filled in these through holes to improve the building's insulation performance.

[0043] This invention also provides a method for fabricating thermal insulation bridge nodes in special parts of low-energy steel structure buildings, including:

[0044] illustrate: Less than 0.3064 W / K The cross-sectional area; This represents the actual cross-sectional area of ​​the wall. This represents the current total area of ​​the wall. The average heat transfer coefficient of the current wall is given without considering the heat transfer coefficient of the main keel.

[0045] Step 101: Obtain the average heat transfer coefficient of the path where the main keel is located, and then obtain the spacing b.

[0046] Specifically: Obtain the minimum heat loss along the path of the main keel section from indoors to outdoors (e.g., Figure 4a When the heat loss is at its minimum, the heat transfer coefficient is also at its minimum. The heat transfer coefficient along the path of the main keel is... :

[0047] (1)

[0048] Specifically, This refers to the average heat transfer coefficient of the main keel and the insulation layer connected to it. Because, Internal surface heat transfer resistance [㎡·K / W]; The external surface heat transfer resistance [㎡·K / W] can be used to determine the heat transfer resistance. and For a constant value, since To be the minimum value, it is necessary to and The goal is to maximize the sum of the terms. Further, we have:

[0049] (2)

[0050] (3)

[0051] As can be seen from the above, the wall thickness is... , λ 主龙骨 , λ 保温层 For a constant value, The heat transfer resistance between the front end of the main keel and the insulation layer [㎡·K / W], The heat transfer resistance of the main keel [㎡·K / W], when b is at its minimum. and The sum of these values ​​is maximized, thus yielding the value of the spacing b, where b ≥ 1.5d.

[0052] Step 102: Obtain the average heat transfer coefficient of the path where the C-shaped angle steel is located, and then obtain the spacing a.

[0053] This includes: obtaining the minimum heat loss along the path of the C-shaped angle steel from indoors to outdoors; when the heat loss is at its minimum, the heat transfer coefficient is also at its minimum; and the heat transfer coefficient along the path of the C-shaped angle steel. :

[0054] (4)

[0055] The average heat transfer coefficient between the end of the C-shaped angle steel and the insulation layer is given, and further, the average heat transfer coefficient of each structure along the path of the C-shaped angle steel on the Y-axis is given (e.g., ...). Figure 4a As shown). Because, Internal surface heat transfer resistance [㎡·K / W]; The external surface heat transfer resistance [㎡·K / W] can be used to determine the heat transfer resistance. and For a constant value, since To be the minimum value, it is necessary to and The goal is to maximize the sum of the terms. Further, we have:

[0056] (5)

[0057] (6)

[0058] As can be seen from the above, the thickness of the insulation layer is... , λ C型角钢 , , λ 保温层 For a constant value, when a is at its minimum and The sum of these values ​​is maximized, thus yielding the value of the first insulation spacing a, where a ≥ 1.5d.

[0059] Furthermore, if one of a or b is obtained, the value of the other b or a can be obtained by the formula a = insulation layer thickness - b the thickness of the C-shaped angle steel in the insulation layer, or by b = insulation layer thickness - a the thickness of the C-shaped angle steel in the insulation layer.

[0060] Step 103: With the main keel as the axis of symmetry, install C-shaped angle steel and heat insulation pads on both sides respectively.

[0061] A heat insulation pad is sandwiched between the body of the C-shaped angle steel and the main keel. Bolts pass through the C-shaped angle steel, the heat insulation pad, the main keel, another heat insulation pad, and another C-shaped angle steel in sequence. The above structural components are fixed together by bolts.

[0062] Furthermore, regarding the selection of the thermal insulation pad in this application, the following explanation is provided: the contact area between the thermal insulation pad and the main keel and C-shaped angle steel should be the minimum value allowed by the structure, and its thickness should be the maximum value within the allowable range of the structure.

[0063] (7)

[0064] (8)

[0065] (9)

[0066] U: Average heat transfer coefficient of the material (W / m²·K), R: Total thermal resistance of the material in the direction of heat flow (m²·K / W). Wall area.

[0067] It is known that the thermal conductivity of steel is greater than that of the insulation layer, and a lower thermal conductivity equates to better insulation performance. In this application, the thermal conductivity of the insulation material used to connect the main keel and the C-shaped angle steel is greater than that of the insulation layer (rock wool). Therefore, the insulation pads should be selected from materials that meet the structural design requirements and have the lowest thermal conductivity. Figure 4a As shown, in the Y direction:

[0068]

[0069]

[0070] The thickness of the insulation pad, : Thermal resistance of the insulation pad in the direction of heat flow [㎡·K / W], A: Wall area (constant), △T: Temperature difference between the inner and outer surfaces of the wall (constant).

[0071] According to formulas (10) and (11), λ 隔热垫块 The thermal conductivity of the insulation pad is given by... When the value is minimized, the insulation pad is made of a material that satisfies the structural design conditions and has the lowest thermal conductivity. Therefore, d... 隔热垫块 Take the maximum value.

[0072] (12)

[0073] Heat flow (W) through this node per unit time in the Y direction; Heat transfer coefficient of the main keel (W / m²·K); The heat transfer coefficient of C-shaped angle steel is W / m²·K. The heat transfer coefficient of the insulation pad (W / m²·K); The average heat transfer coefficient of the current wall (W / ㎡·K) without considering the heat transfer coefficient of the main keel; : The actual cross-sectional area of ​​the wall (the remaining wall area in square meters after subtracting the cross-sectional areas of the main keel, C-shaped angle steel and heat insulation pads); : Current total wall area (m²).

[0074] (13)

[0075] (14)

[0076] (15)

[0077] Heat loss due to thermal bridge (W / K), further:

[0078] (16)

[0079] (17)

[0080] (18)

[0081] 0.3064W / K

[0082] (19)

[0083] In this formula, The value is fixed due to the influence of the project's exterior wall design. For a constant value, In traditional designs, the cross-sectional area of ​​the main keel is a fixed value. , , , It is a constant. Therefore, it has an impact. The for and Therefore, in order to make Minimum value and The minimum value should be taken.

[0084] Step 104: Use bolts to fix the body of the C-shaped angle steel, the heat insulation pad, and the front end of the main keel.

[0085] Step 105: Pass the front end of the C-shaped angle steel through the front of the insulation layer so that there is a gap b between the front end of the main keel and the front of the insulation layer.

[0086] At this point, the body of the C-shaped angle steel is fixed to the front end of the main keel and is covered by the insulation layer.

[0087] Step 106: Fix the front end of the C-shaped angle steel to the end of the secondary keel by welding.

[0088] In step 105, the end of the C-shaped angle steel is covered by the insulation layer, and the distance between the end of the C-shaped angle steel and the back of the insulation layer is a.

[0089] Step 107: The end of the main keel is fixed to the I-beam with bolts.

[0090] Step 108: The front end of the secondary keel is welded to the steel component.

[0091] Step 109: Apply silicone sealant and cover with a waterproof and vapor barrier membrane.

[0092] The gap between the main keel and the wall is coated with silicone sealant or polyurethane foam and covered with a waterproof and vapor-proof membrane.

[0093] Step 110: Fill with polyurethane foam.

[0094] The gap between the main keel and the insulation layer is filled with polyurethane foam.

[0095] Generally, a≥1.5d, b≥1.5d, d=bolt diameter+2mm, where the bolt diameter is related to the structural stress condition of the current building.

[0096] This invention provides a method for fabricating a thermally insulating bridge node in a special part of a low-energy steel structure building. The body of the C-shaped angle steel is fixed to the front end of the main keel and covered by an insulation layer. The distance b between the front end of the main keel and the insulation layer is ≥ 1.5d, where b is determined according to... It is determined that the heat loss from the main keel to the secondary keel is obtained. The front end of the C-shaped angle steel extends from the front of the insulation layer and is fixed to the end of the secondary keel. The end of the C-shaped angle steel is covered by the insulation layer, and the distance a between the end of the C-shaped angle steel and the insulation layer is ≥ 1.5d, where a is determined according to... The heat loss is obtained based on the heat loss from the secondary keel to the main keel. .

[0097] The advantage of this invention is that it divides the main keel into two parts at the insulation layer, with the two parts separated by thermal insulation pads and fixed with bolts, thus creating a thermal bridging effect. This invention changes the original support structure of a single keel to a support structure composed of main and secondary keels, separated by thermal insulation pads and fixed with bolts, achieving the purpose of creating a thermal bridging effect. This reduces the number of thermal bridge points, reduces heat loss at individual main keel joints, and ultimately significantly reduces the overall thermal bridge value of the building.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-energy-consumption steel structure building special part heat insulation heat bridge node, comprising an I-beam, an insulation layer and an aluminum plate, characterized in that, It includes: Main keel, secondary keel, C-shaped angle steel, steel components, The body of the C-shaped angle steel is fixed with the front end of the main keel and is covered by the thermal insulation layer, the spacing b between the front end of the main keel and the thermal insulation layer is greater than or equal to 1.5d, including, the spacing b is the average heat transfer coefficient of the path where the main keel is located from the indoor to the outdoor direction is the minimum value; The front end of the C-shaped angle steel is out of the front surface of the heat preservation layer and is fixedly connected with the end of the secondary keel, and the end of the C-shaped angle steel is covered by the heat preservation layer; the spacing a between the end of the C-shaped angle steel and the heat preservation layer is a≥1.5d, wherein the spacing a is according to the heat transfer coefficient of the path where the C-shaped angle steel is located As a result, the is the average heat transfer coefficient between the end of the C-shaped angle steel and the heat preservation layer, and is the average heat transfer coefficient of each structure on the path where the C-shaped angle steel is located on the Y axis; The front end of the secondary keel is provided with the steel component fixedly connected with the aluminum plate; The end of the main keel is fixed with the I-beam through bolts; The C-shaped angle steel and the main keel are clamped with the heat insulation pad, and the three are fixed through bolts; Wherein, d = bolt diameter + 2mm.

2. The low-energy steel structure building special part thermal insulation heat bridge node according to claim 1, characterized in that, The C-shaped angle steel and the heat insulation pad are symmetrically arranged about the main keel, and the specific arrangement sequence is C-shaped angle steel-heat insulation pad-main keel-heat insulation pad-C-shaped angle steel, and the above structural parts are fixed through bolts.

3. The low-energy steel structure building special part thermal insulation heat bridge node according to claim 1, characterized in that, The connection between the front end of the C-shaped angle steel and the secondary keel and the connection between the secondary keel and the steel component are fixed through welding.

4. The low-energy steel structure building special part thermal insulation heat bridge node according to claim 1, characterized in that, The gap between the main keel and the wall is filled with foamed polyurethane or silicone sealant and covered with a waterproof vapor barrier film, and the gap between the main keel and the thermal insulation layer is filled with foamed polyurethane.

5. A method for manufacturing a thermal insulation bridge node at a special part of a low-energy steel structure building, capable of realizing the thermal insulation bridge node according to any one of claims 1-4, characterized in that, Include: Obtaining an average heat transfer coefficient of a path where the main keel is located from the indoor to the outdoor direction wherein, is an average heat transfer coefficient of the main keel and the thermal insulation layer connected to the main keel; Obtaining an average heat transfer coefficient along the path of the C-shaped angle steel from the indoor to the outdoor direction wherein is an average heat transfer coefficient between the end of the C-shaped angle steel and the thermal insulation layer; According to the above Obtaining the distance b between the front end of the main keel and the thermal insulation layer; according to the above Obtaining the distance a between the end of the C-shaped angle steel and the thermal insulation layer; wherein a+b≥3d and a≥1.5d, b≥1.5d; wherein the method comprises the steps of The distance b between the front end of the main keel and the heat preservation layer is obtained in the cross section, specifically: such that the value of b is minimized. : inner surface heat transfer resistance [m2·K / W]; : outer surface heat transfer resistance [m2·K / W]; is the insulation layer thickness; is the average heat transfer coefficient of the main keel and the insulation layer connected with the main keel; is the thermal resistance of the front end of the main keel [m2·K / W]; is the thermal resistance of the main keel [m2·K / W]; wherein the C-shaped angle steel end is obtained according to the The distance a between the C-shaped angle steel end and the heat preservation layer is obtained, specifically: such that the value of a is minimized, obtaining said distance a; : inner surface heat transfer resistance [m2·K / W]; : outer surface heat transfer resistance [m2·K / W]; : thickness of the insulation layer; : average heat transfer coefficient of the C-shaped angle steel [W / (m2·K)]; : average heat transfer coefficient between the end of the C-shaped angle steel and the insulation layer; : thermal resistance of the insulation layer at the end of the C-shaped angle steel [m2·K / W]; : thermal resistance of the wall [m2·K / W].

Images