CN219431057U - Steel structural column heat insulation structure - Google Patents

Steel structural column heat insulation structure Download PDF

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Publication number
CN219431057U
CN219431057U CN202320080290.XU CN202320080290U CN219431057U CN 219431057 U CN219431057 U CN 219431057U CN 202320080290 U CN202320080290 U CN 202320080290U CN 219431057 U CN219431057 U CN 219431057U
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China
Prior art keywords
rock wool
wool layer
wall
aerated concrete
steel
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CN202320080290.XU
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Chinese (zh)
Inventor
霍慧敏
李怀
吴剑林
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China Academy of Building Research CABR
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China Academy of Building Research CABR
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Priority to CN202320080290.XU priority Critical patent/CN219431057U/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/24—Structural elements or technologies for improving thermal insulation
    • Y02A30/242—Slab shaped vacuum insulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B80/00—Architectural or constructional elements improving the thermal performance of buildings
    • Y02B80/10—Insulation, e.g. vacuum or aerogel insulation

Abstract

The application relates to the technical field of buildings, and provides a steel structure column insulation structure, which comprises: an aerated concrete outer wall, a first rock wool layer and a vacuum insulation panel; the aerated concrete outer wall is connected with the first side surface and the second side surface of the steel structure column, and extends in a direction away from the steel structure column; the first rock wool layer is arranged on the side surface of the aerated concrete outer wall, which is close to the outside; the vacuum heat insulation plate is arranged on the side surface of the steel structure column, which is close to the outside, and extends towards the direction of the first rock wool layer until the length of the vacuum heat insulation plate, which is lapped on the first rock wool layer, reaches the preset length. The application utilizes first rock wool layer to keep warm to the aerated concrete outer wall, reduces the thermal bridge effect of aerated concrete outer wall department, adopts vacuum insulation panel to carry out heat preservation to the side that steel construction post is close to outdoor simultaneously to utilize the gap of the overlap joint department sealed first rock wool layer of vacuum insulation panel and first rock wool layer and steel construction post juncture, improve the heat preservation effect, reduce the thermal bridge effect.

Description

Steel structural column heat insulation structure
Technical Field
The application relates to the technical field of buildings, in particular to a steel structure column heat insulation structure.
Background
The thermal bridge effect mainly occurs at the parts of materials with high heat conductivity embedded in the enclosure structure with low heat conductivity or at the parts with reduced thickness of certain heat insulation materials in the enclosure structure, such as reinforced concrete, metal beams, columns, ribs or metal connectors, through-outer window pipelines and the like in the enclosure structures of outer walls, roofs and the like. The temperature difference between the indoor and outdoor sides in winter and summer is large, and the indoor cooling and heat loss is caused by the heat bridge effect generated by uneven heat conduction of the wall body, so that the condensation, mildew and even water dripping of the inner wall of a house can be caused, and the building quality and the living environment are influenced. Therefore, a thermal bridge cut-off process is required in the construction engineering.
The heat preservation and heat insulation are effective measures for improving the overall heat conduction performance of the building enclosure structure. By adopting the high-performance heat-insulating material to perform heat-insulating treatment on the building outer wall and the roof, the heat bridge effect can be effectively reduced, the indoor environment quality can be improved, and the building energy consumption can be reduced.
Although the conventional public building has lower requirements on the treatment of the broken heat bridge, special treatment on the heat bridge is required in GB/T51350-2019 of the building technical standard of near zero energy consumption aiming at the public building enclosure structure of near zero energy consumption. The heat bridge effect ratio in the near-zero energy consumption building is far higher than that of the common energy-saving building, so the heat bridge treatment is a key factor for realizing the goal of the near-zero energy consumption building, especially the near-zero energy consumption building which adopts a steel structure and is positioned in a severe cold and cold climate area with larger indoor and outdoor temperature difference, and the steel structure column of the outer enclosure structure is a key part for generating the heat bridge. However, no construction method for reference is available for the heat-insulating bridge at the steel structure column at present, so that the heat-insulating bridge effect at the position is obvious.
Disclosure of Invention
The application provides a steel structure column heat preservation structure for solve the present construction method to the broken heat bridge of steel structure column department and do not have the reference, lead to this position heat bridge effect obvious technical problem.
The application provides a steel construction post insulation construction, include: an aerated concrete outer wall, a first rock wool layer and a vacuum insulation panel;
the aerated concrete outer wall is connected with the first side surface and the second side surface of the steel structure column, and extends in a direction away from the steel structure column;
the first rock wool layer is arranged on the side surface, close to the outdoor side, of the aerated concrete outer wall;
the vacuum insulation panels are arranged on the side surface, close to the outside, of the steel structure column, and extend towards the direction of the first rock wool layer until the length of the first rock wool layer in lap joint reaches a preset length.
In one embodiment, further comprising: a second rock wool layer;
the second rock wool layer is arranged on the side surface, close to the outside, of the vacuum insulation panel.
In one embodiment, further comprising: a double-layer glass fiber net plastering layer;
the double-layer glass fiber net plastering layer is arranged on the side surface of the first rock wool layer close to the outside and the side surface of the second rock wool layer close to the outside.
In one embodiment, further comprising: waterproof vapor barrier film;
the waterproof steam barrier film is adhered to the joint of the aerated concrete outer wall and the steel structure column, and is close to an indoor included angle.
In one embodiment, further comprising: a waterproof breathable film;
waterproof ventilated membrane is pasted the aerated concrete outer wall with steel construction post junction is close to outdoor contained angle, just waterproof ventilated membrane with first rock wool layer is close to indoor side laminating mutually.
In one embodiment, further comprising: a cement mortar plastering layer;
the cement mortar plastering layer is arranged on the side surface, close to the indoor space, of the aerated concrete outer wall, and between the aerated concrete outer wall and the first rock wool layer.
In one embodiment, further comprising: a broken heat bridge anchor bolt;
the first rock wool layer is fixedly connected with the aerated concrete outer wall through the heat-insulating bridge anchor bolt.
In one embodiment, further comprising: fireproof paint;
the fireproof coating is wrapped on the outer peripheral surface of the steel structure column.
In one embodiment, the steel structural columns are square, and the first side is adjacent to the second side.
In one embodiment, the steel structural columns are square, and the first side faces are opposite to the second side faces.
The application provides a steel construction post insulation construction, including aerated concrete outer wall, first rock wool layer and vacuum insulation panel, the aerated concrete outer wall meets with the first side and the second side of steel construction post, and the aerated concrete outer wall extends to the direction of keeping away from the steel construction post, first rock wool layer sets up on the outdoor side of aerated concrete outer wall being close to, vacuum insulation panel sets up on the outdoor side of steel construction post being close to, and vacuum insulation panel extends to the direction on first rock wool layer, until the overlap joint reaches preset length at the length on first rock wool layer. According to the heat insulation method, the first rock wool layer is used for insulating the aerated concrete outer wall connected with the steel structure column, the heat bridge effect of the aerated concrete outer wall is reduced, in addition, in order to enable the thickness of the steel structure column after heat insulation treatment to be excessively increased, the heat bridge effect of the steel structure column is weakened, the side face, close to the outside, of the steel structure column is subjected to heat insulation treatment by the aid of the vacuum insulation panel with thinner thickness and more excellent heat insulation performance, gaps of the junction of the first rock wool layer and the steel structure column are sealed by the aid of the lap joint of the vacuum insulation panel and the first rock wool layer, heat insulation effect is further improved, and the heat bridge effect is reduced.
Drawings
For a clearer description of the present application or of the prior art, the drawings that are used in the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is one of the schematic diagrams of a steel structural column insulation structure provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of a steel structure column insulation structure according to an embodiment of the present disclosure.
Reference numerals:
1-an aerated concrete outer wall; 2-a first rock wool layer; 3-vacuum insulation panels; 4-a second rock wool layer; 5-a double-layer glass fiber net plastering layer; 6-waterproof steam barrier film; 7-a waterproof breathable film; 8-a cement mortar plastering layer; 9-a heat-insulating bridge anchor bolt; 10-fireproof paint; 11-steel structural columns.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application, and it is apparent that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the embodiments of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are based on those shown in the drawings, are merely for convenience in describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the embodiments of the present application will be understood by those of ordinary skill in the art in a specific context.
In the examples herein, a first feature "on" or "under" a second feature may be either the first and second features in direct contact, or the first and second features in indirect contact via an intermediary, unless expressly stated and defined otherwise. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
FIG. 1 is one of the schematic diagrams of a steel structural column insulation structure provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of a steel structure column insulation structure according to an embodiment of the present disclosure.
Referring to fig. 1-2, the present application provides a steel structural column insulation structure, which may include: an aerated concrete outer wall 1, a first rock wool layer 2 and a vacuum insulation panel 3;
the aerated concrete outer wall 1 is connected with the first side surface and the second side surface of the steel structure column 11, and the aerated concrete outer wall 1 extends in a direction away from the steel structure column 11;
the first rock wool layer 2 is arranged on the side surface of the aerated concrete outer wall 1, which is close to the outside;
the vacuum insulation panel 3 is arranged on the side surface of the steel structure column 11, which is close to the outside, and the vacuum insulation panel 3 extends towards the direction of the first rock wool layer 2 until the length of the first rock wool layer 2 is overlapped to reach the preset length.
The aerated concrete is a novel energy-saving and environment-friendly building material which is prepared from siliceous materials (such as fly ash) and calcareous materials (such as lime and cement) as raw materials and is light in weight, and can improve shock resistance and reduce self weight of a building due to high-rise buildings in areas with lower bearing capacity to the ground.
It should be noted that, the first rock wool layer 2 and the vacuum insulation panel 3 with different thicknesses and different heat conductivity coefficients can be selected according to actual requirements, and the method is not limited herein, in this embodiment, the thickness of the first rock wool layer 2 may be 300 mm, the heat conductivity coefficient may be 0.040 watt/(m·kelvin), the thickness of the vacuum insulation panel 3 may be 30 mm, and the heat conductivity coefficient may be 0.005-0.008 watt/(m·kelvin); the preset length of the lap joint of the vacuum insulation panel 3 and the first rock wool layer 2 can also be set according to actual requirements, and in this embodiment, the preset length can be 200 mm.
In addition, in practical application, the steel structural columns 11 may be square, and the first side and the second side may be adjacent, i.e., the steel structural columns 11 are disposed at corners of the wall, as shown in fig. 1, and the first side and the second side may be opposite, i.e., the steel structural columns 11 are disposed in the middle of the wall, as shown in fig. 2.
The embodiment provides a steel structure column insulation structure, including aerated concrete outer wall, first rock wool layer and vacuum insulation panel, the aerated concrete outer wall meets with the first side and the second side of steel structure column, and the aerated concrete outer wall extends to the direction of keeping away from the steel structure column, first rock wool layer sets up on the side that the aerated concrete outer wall is close to outdoor, vacuum insulation panel sets up on the side that the steel structure column is close to outdoor, and vacuum insulation panel extends to the direction on first rock wool layer, until the overlap joint reaches preset length at the length on first rock wool layer. In addition, in order to enable the thickness of the steel structure column after heat preservation to be excessively increased, and simultaneously weaken the heat bridge effect of the steel structure column, a vacuum heat insulation plate with thinner thickness and more excellent heat preservation and insulation performance is adopted to conduct heat preservation treatment on the side surface of the steel structure column, which is close to the outside, and a gap at the junction of the first rock wool layer and the steel structure column is sealed by utilizing the lap joint of the vacuum heat insulation plate and the first rock wool layer, so that the heat preservation effect is further improved, and the heat bridge effect is reduced.
Referring to fig. 1-2, in one embodiment, the steel structural column insulation structure may further comprise a second rock wool layer 4;
the second rock wool layer 4 is provided on the side of the vacuum insulation panel 3 close to the outside.
It should be noted that, the second rock wool layers 4 with different thicknesses may be selected according to practical requirements, which is not limited herein, and in this embodiment, the thickness of the second rock wool layer 4 may be 40 mm.
Since the vacuum insulation panel 3 is easily damaged by exposure, the heat insulation performance is greatly reduced once damaged.
According to the embodiment, the vacuum heat insulation plate is wrapped by the second rock wool layer, so that the heat insulation performance among the steel structure column, the vacuum heat insulation plate and the first rock wool layer can be further enhanced while the vacuum heat insulation plate is protected, and the heat bridge effect is reduced.
Referring to fig. 1-2, in one embodiment, the steel structural column insulation structure may further comprise a double layer fiberglass mesh plastering layer 5;
the double-layer glass fiber net plastering layer 5 is arranged on the side surface of the first rock wool layer 2 close to the outside and the side surface of the second rock wool layer 4 close to the outside.
The first rock wool layer and the second rock wool layer are wrapped by the double-layer glass fiber net plastering layer, so that the first rock wool layer and the second rock wool layer can be reinforced, and cracking of the first rock wool layer and the second rock wool layer is prevented.
Referring to fig. 1-2, in one embodiment, the steel structural column insulation structure may further include a waterproof vapor barrier 6;
the waterproof steam barrier film 6 is stuck on the joint of the aerated concrete outer wall 1 and the steel structure column 11 and is close to an indoor included angle.
The air tightness refers to the intensity of air flow exchange between gaps, holes and outdoor environment through the outer protective structure of the building, and is usually characterized by ventilation times. The unorganized airflow through the enclosure in winter and summer can cause an increase in the cold and hot loads of the building. Especially in cold winter, cold air permeation caused by lower air tightness of the outer protective structure can cause the increase of building heating energy consumption, so that the near zero energy consumption building in the severe cold region needs to be subjected to special air tightness treatment.
Because gaps exist at the joint of the aerated concrete outer wall 1 and the steel structure column 11, which is a key part for the air tightness problem, the problem can be solved by sticking a waterproof steam barrier film 6 at the joint of the aerated concrete outer wall 1 and the steel structure column 11, which is close to an indoor included angle.
It should be noted that, the length of the waterproof vapor barrier 6 adhered to the side surface of the aerated concrete outer wall 1 near the room and the length of the waterproof vapor barrier 6 adhered to the side surface of the steel structure column 11 near the room may be set according to actual needs, in this embodiment, the length of the waterproof vapor barrier 6 adhered to the side surface of the aerated concrete outer wall 1 near the room is greater than or equal to 100 mm, and the length of the waterproof vapor barrier 6 adhered to the side surface of the steel structure column 11 near the room is also greater than or equal to 100 mm.
According to the embodiment, the waterproof steam barrier film is adhered to the joint of the aerated concrete outer wall and the steel structure column near the indoor included angle, so that the air tightness between the steel structure column and the aerated concrete outer wall can be improved, and the energy consumption of a building can be reduced.
Referring to fig. 1-2, in one embodiment, the steel structural column insulation structure may further comprise a cement mortar render layer 8;
the cement mortar plastering layer 8 is arranged on the side surface, close to the indoor space, of the aerated concrete outer wall 1 and between the aerated concrete outer wall 1 and the first rock wool layer 2.
According to the embodiment, the air tightness of the aerated concrete outer wall can be further improved by arranging the cement mortar plastering layer, so that the overall air tightness of the building is further improved, and the energy consumption of the building is reduced.
Referring to fig. 1-2, in one embodiment, the steel structural column insulation structure may further include a waterproof breathable membrane 7;
the waterproof and breathable film 7 is adhered to the joint of the aerated concrete outer wall 1 and the steel structure column 11 and is close to an outdoor included angle, and the waterproof and breathable film 7 is adhered to the side surface of the first rock wool layer 2, which is close to the indoor side surface.
Since gaps exist at the junctions of the aerated concrete outer wall 1, the first rock wool layer 2 and the steel structure column 11, and the gaps are important parts for the air tightness problem, the problem can be solved by sticking the waterproof and breathable film 7 at the junctions.
It should be noted that, the bonding length of the waterproof and breathable film 7 between the aerated concrete outer wall 1 and the first rock wool layer 2 and the bonding length between the steel structural column 11 and the first rock wool layer 2 may be set according to actual needs, in this embodiment, the bonding length of the waterproof and breathable film 7 between the aerated concrete outer wall 1 and the first rock wool layer 2 is greater than or equal to 100 millimeters, and the bonding length of the waterproof and breathable film 7 between the steel structural column 11 and the first rock wool layer 2 is also greater than or equal to 100 millimeters.
According to the embodiment, the waterproof and breathable film is adhered to the junction of the aerated concrete outer wall, the first rock wool layer and the steel structure column, so that on one hand, gaps at the junction can be sealed, the air tightness is improved, the energy consumption of a building is reduced, on the other hand, moisture in the aerated concrete can be prevented from entering the first rock wool layer, and water vapor in the first rock wool layer is removed, so that the heat preservation and heat insulation performance of the first rock wool layer is improved, and the energy consumption of the building is reduced.
Referring to fig. 1-2, in one embodiment, the steel structural column insulation structure further comprises a heat bridge cutoff anchor 9;
the first rock wool layer 2 is fixedly connected with the aerated concrete outer wall 1 through a heat-insulating bridge anchor bolt 9.
According to the embodiment, the first rock wool layer is fixed with the aerated concrete outer wall by using the heat-insulating bridge anchor bolt, so that adverse effects of a heat bridge effect generated at the fixing part on building energy consumption can be prevented.
Referring to fig. 1-2, in one embodiment, the steel structural column insulation structure further comprises a fire retardant coating 10;
the fireproof paint 10 is wrapped on the outer peripheral surface of the steel structural column 11.
According to the embodiment, the fireproof paint is wrapped on the outer peripheral surface of the steel structure column, so that the influence on the steel structure column of the building during fire disaster can be prevented, and the building safety is improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (10)

1. A steel structural column insulation structure, comprising: an aerated concrete outer wall, a first rock wool layer and a vacuum insulation panel;
the aerated concrete outer wall is connected with the first side surface and the second side surface of the steel structure column, and extends in a direction away from the steel structure column;
the first rock wool layer is arranged on the side surface, close to the outdoor side, of the aerated concrete outer wall;
the vacuum insulation panels are arranged on the side surface, close to the outside, of the steel structure column, and extend towards the direction of the first rock wool layer until the length of the first rock wool layer in lap joint reaches a preset length.
2. The steel structural column insulation structure of claim 1, further comprising: a second rock wool layer;
the second rock wool layer is arranged on the side surface, close to the outside, of the vacuum insulation panel.
3. The steel structural column insulation structure of claim 2, further comprising: a double-layer glass fiber net plastering layer;
the double-layer glass fiber net plastering layer is arranged on the side surface of the first rock wool layer close to the outside and the side surface of the second rock wool layer close to the outside.
4. The steel structural column insulation structure of claim 1, further comprising: waterproof vapor barrier film;
the waterproof steam barrier film is adhered to the joint of the aerated concrete outer wall and the steel structure column, and is close to an indoor included angle.
5. The steel structural column insulation structure of claim 1, further comprising: a waterproof breathable film;
waterproof ventilated membrane is pasted the aerated concrete outer wall with steel construction post junction is close to outdoor contained angle, just waterproof ventilated membrane with first rock wool layer is close to indoor side laminating mutually.
6. The steel structural column insulation structure of claim 1, further comprising: a cement mortar plastering layer;
the cement mortar plastering layer is arranged on the side surface, close to the indoor space, of the aerated concrete outer wall, and between the aerated concrete outer wall and the first rock wool layer.
7. The steel structural column insulation structure of claim 1, further comprising: a broken heat bridge anchor bolt;
the first rock wool layer is fixedly connected with the aerated concrete outer wall through the heat-insulating bridge anchor bolt.
8. The steel structural column insulation structure of claim 1, further comprising: fireproof paint;
the fireproof coating is wrapped on the outer peripheral surface of the steel structure column.
9. The steel structural column insulation structure of claim 1, wherein,
the steel structure column is square, and the first side surface is adjacent to the second side surface.
10. The steel structural column insulation structure of claim 1, wherein,
the steel structure column is square, and the first side face is opposite to the second side face.
CN202320080290.XU 2023-01-12 2023-01-12 Steel structural column heat insulation structure Active CN219431057U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202320080290.XU CN219431057U (en) 2023-01-12 2023-01-12 Steel structural column heat insulation structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202320080290.XU CN219431057U (en) 2023-01-12 2023-01-12 Steel structural column heat insulation structure

Publications (1)

Publication Number Publication Date
CN219431057U true CN219431057U (en) 2023-07-28

Family

ID=87331296

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202320080290.XU Active CN219431057U (en) 2023-01-12 2023-01-12 Steel structural column heat insulation structure

Country Status (1)

Country Link
CN (1) CN219431057U (en)

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