Metallurgical plant roof ventilator steel plate and waterproof construction method

Abstract

The invention discloses a metallurgical factory roof ventilator steel plate and a waterproof construction method, and relates to the technical field of building construction.The metallurgical factory roof ventilator steel plate comprises a waterproof steel plate structure, the waterproof steel plate structure is installed on a roof, the waterproof steel plate structure is used for protecting indoor objects from being damaged by rainwater, and the waterproof steel plate structure comprises a waterproof steel plate assembly; the waterproof steel plate assembly is installed on a waterproof steel plate structure, the waterproof steel plate assembly is used for being connected with a roof wingceltis strip, the waterproof steel plate assembly comprises a steel plate body structure, the steel plate body structure is arranged on a colored profiled steel plate roof, and the left side and the right side of the steel plate body structure are each provided with an extension waterproof plate. According to the waterproof construction method for the steel plate of the metallurgical factory roof ventilator, the waterproof main body structure of the steel plate and the ventilator base can be synchronously designed and constructed, installation can be completed by means of a hoisting machine during steel structure installation, construction is convenient, and cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a roof ventilator steel plate for a metallurgical factory and a waterproof construction method. Background Art

[0002] Most of the metallurgical industrial plants are steel structure plants, and the roofs of steel structure plants are generally made of colored corrugated steel sheets. The colored corrugated steel sheet roof structure is generally to add roof purlins on the roof beams, and weld the colored corrugated steel sheet purlin brackets on the upper part of the roof purlins. The colored corrugated steel sheet is stuck in the purlin brackets and fixed with flower bolts or 360-degree upright concealed buckle connection. Each colored steel sheet on the roof is composed of crests and troughs, and the overlap is located at the crest, and rainwater flows in the trough. The colored corrugated steel sheet roof is set with a certain slope, generally 1:20. It has good waterproof performance and can effectively prevent rainwater from penetrating even in severe weather conditions, protecting items in the house from water erosion.

[0003] Generally, large factory roofs will be equipped with ventilators, especially steelmaking plants will be equipped with more ventilators. The ventilator column is fixed on the bracket, and the bracket is fixed on the factory roof purlin. The entire ventilator area is opened, and no colored corrugated steel plate is set to facilitate ventilation of the factory. Although the ventilator body can prevent rainwater from falling directly into the factory, rainwater from the top and side of the ventilator will still flow into the ventilator opening area, causing water leakage in the factory.

[0004] The problem of sealing holes in the colored corrugated steel sheet roof has always been a key and difficult point in metallurgical engineering construction. Since the colored corrugated steel sheet has no weldability, it cannot be directly connected to the ventilator base by welding. And because the colored corrugated steel sheet roof has a certain slope, when opening holes in the roof, it is necessary to consider not only the rainwater around the hole, but also how to drain the water from the hole to the ridge. If not handled properly, it is very easy to cause roof leakage. Summary of the invention

[0005] The present invention intends to provide a metallurgical factory roof ventilator steel plate and a waterproof construction method to solve the difficulties in the prior art in the waterproof construction process of the ventilator area on the colored corrugated steel plate roof of the metallurgical industrial plant.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A steel plate structure for a roof ventilator in a metallurgical plant, comprising a waterproof steel plate structure, the waterproof steel plate structure being installed on the roof and being used to protect items in the house from being damaged by rainwater, the waterproof steel plate structure comprising

[0008] A waterproof steel plate assembly is installed on a waterproof steel plate structure, and the waterproof steel plate assembly is used to connect with the roof strips. The waterproof steel plate assembly includes

[0009] A steel plate main structure, the steel plate main structure is arranged on a colored corrugated steel plate roof, and extended waterproof plates are arranged on both sides of the steel plate main structure;

[0010] A stiffening plate is arranged between the steel plate main structure and the extended waterproof plate, and the stiffening plate is conducive to the diversion of rainwater.

[0011] As a further solution of the present invention: the waterproof steel plate structure also includes

[0012] A ventilator body, the ventilator body is used to ventilate the house, and the ventilator body is installed on a ventilator base;

[0013] A lower waterproof plate, which is arranged at the lower end of the ventilator base and connected to the ventilator base

[0014] Side waterproofing plates, wherein two groups of side waterproofing plates are provided and are arranged on both sides of the ventilator base, and the ventilator base is arranged on the colored corrugated steel sheet roof;

[0015] An upper waterproof plate, the upper waterproof plate being arranged between the ventilator base and the waterproof steel plate assembly;

[0016] A flat color plate is installed on one side of the waterproof steel plate assembly through a lower waterproof plate, and the flat color plate is arranged on the outer side of the wall.

[0017] As a further solution of the present invention: one side of the upper waterproof plate is installed on the ventilator base, and the other side of the upper waterproof plate is installed on the steel plate main structure, and the other side of the steel plate main structure is fixedly connected to the flat color plate by waterproof self-tapping screws.

[0018] As a further solution of the present invention:.

[0019] As a further solution of the present invention: the colored corrugated steel sheet roof is fixed to the steel plate by waterproof self-tapping screws, and the steel plate main structure and the ventilator base are welded and connected by the steel plate.

[0020] The invention also discloses a waterproof construction method for a steel plate of a roof ventilator in a metallurgical plant, comprising the following steps:

[0021] S1. Make waterproof steel plate assemblies and install the steel plate main structure of the waterproof steel plate assemblies;

[0022] S2. Use steel plates to set side waterproof plates on the left and right sides of the ventilator base;

[0023] S3. Use steel plate to set lower waterproof plate at the lower end of the ventilator base;

[0024] S4. Extended waterproof plates are installed on the left and right sides of the main steel plate structure, and stiffening plates are welded;

[0025] S5. An upper waterproof plate is provided on the upper part of the ventilator base;

[0026] S6. Use flat color plates to handle the overlapping waterproofing between the ridge and the waterproof steel plate assembly.

[0027] As a further solution of the present invention: the steel plate main structure generally uses channel steel as a skeleton and is covered with steel plates, and the steel plate main structure is installed synchronously with the ventilator base.

[0028] As a further solution of the present invention: the side waterproof board should extend outwards with a wave crest, and the end of the side waterproof board should be bent into 135 degrees.

[0029] As a further solution of the present invention: the two ends of the upper waterproof board, the extended waterproof board and the lower waterproof board are preferably aligned with the two ends of the side waterproof board.

[0030] As a further solution of the present invention: the width of the lower waterproof board is preferably 300 mm, and the side waterproof boards, the upper waterproof board and the lower waterproof board maintain the ventilator base as a closed space in the vertical direction.

[0031] As a further solution of the present invention: the V-shaped arrangement of the stiffening plates not only strengthens the main structure of the steel plate, but also facilitates the diversion of rainwater.

[0032] Beneficial effects of the present invention:

[0033] (1) The waterproof construction method of the steel plate of the roof ventilator of the metallurgical plant of the present invention can be designed and constructed synchronously with the ventilator base, and can be installed with the help of a hoisting machine during the installation of the steel structure, so the construction is relatively convenient and the cost is relatively low;

[0034] (2) The waterproof construction method of the steel plate for the roof ventilator of the metallurgical plant of the present invention replaces part of the colored corrugated steel plate roof with the steel plate roof, and the steel plate roof and the ventilator base can be connected by welding, so the waterproof effect is better;

[0035] (3) The waterproof construction method of the steel plate for the roof ventilator of a metallurgical plant of the present invention mainly needs to complete the waterproof connection problem between the steel plate and the colored corrugated steel plate during the roof construction stage. During the construction, the roof is closed, which has good safety. Moreover, the construction materials can be hoisted in advance to the main structure of the steel plate roof for storage, and the construction is also relatively convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] Figure 1 The present invention is the metallurgical factory roof ventilator steel plate waterproof construction plan layout Figure 1 ;

[0038] Figure 2 The present invention is the metallurgical factory roof ventilator steel plate waterproof construction plan layout Figure 2 ;

[0039] Figure 3 It is a cross-sectional view of the ventilator body and the waterproof steel plate assembly in the present invention;

[0040] Figure 4 This is a schematic diagram of the construction of the waterproof steel plate assembly in the present invention. Figure 1 ;

[0041] Figure 5 This is a schematic diagram of the construction of the waterproof steel plate assembly in the present invention. Figure 2 ;

[0042] Figure 6 It is a schematic diagram of the ventilator body and the side waterproof plate in the present invention;

[0043] Figure 7 It is a schematic diagram of the ventilator body and the lower waterproof plate in the present invention.

[0044] In the figure: 1. Waterproof steel plate structure; 101. Color corrugated steel plate roof; 102. Ventilator body; 103. Ventilator base; 104. Side waterproof plate; 105. Waterproof steel plate assembly; 106. Upper waterproof plate; 107. Flat color plate; 108. Lower waterproof plate; 109. Waterproof self-tapping screws; 1051. Steel plate main structure; 1052. Extended waterproof plate; 1053. Stiffening plate. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Embodiment 1

[0047] See also Figure 1-Figure 7 As shown, the present invention is a steel plate structure for a roof ventilator in a metallurgical factory, comprising a waterproof steel plate structure 1, which is installed on the roof and is used to protect items in the house from being damaged by rain. The waterproof steel plate structure 1 comprises

[0048] The waterproof steel plate assembly 105 is installed on the waterproof steel plate structure 1. The waterproof steel plate assembly 105 is used to connect with the roof strips. The waterproof steel plate assembly 105 includes

[0049] A steel plate main structure 1051, which is arranged on the colored corrugated steel plate roof 101, and an extended waterproof plate 1052 is arranged on both sides of the steel plate main structure 1051;

[0050] The stiffening plate 1053 is arranged between the steel plate main structure 1051 and the extended waterproof plate 1052, and the stiffening plate 1053 is conducive to the diversion of rainwater.

[0051] It should be noted that the steel plate main structure 1051 is made of steel material, and the steel plate main structure 1051 is used to provide the main supporting force. The extended waterproof plate 1052 is arranged at the edge to provide additional waterproof effect. The stiffening plate 1053 is made of steel plate or other metal materials, and the stiffening plate 1053 is used to provide stability to prevent deformation or damage caused by external force.

[0052] In the present invention, preferably, the waterproof steel plate structure 1 also includes

[0053] A ventilator body 102, which is used to ventilate the house, and the ventilator body 102 is installed on a ventilator base 103;

[0054] The lower waterproof plate 108 is arranged at the lower end of the ventilator base 103 and connected to the ventilator base 103.

[0055] Side waterproofing plates 104, two sets of side waterproofing plates 104 are provided and are arranged on both sides of the ventilator base 103, and the ventilator base 103 is provided on the color corrugated steel sheet roof 101;

[0056] An upper waterproof plate 106, which is disposed between the ventilator base 103 and the waterproof steel plate assembly 105;

[0057] The flat color plate 107 is installed on one side of the waterproof steel plate assembly 105 through the lower waterproof plate 108, and the flat color plate 107 is arranged on the outer side of the wall.

[0058] It should be noted that the material of the ventilator base 103 is made of stainless steel or galvanized steel plate material, and the ventilator base 103 is used to support the ventilator body 102, and the connection point between the ventilator base 103 and the components;

[0059] The lower waterproofing plate 108, the side waterproofing plate 104, and the upper waterproofing plate 106 are all made of galvanized steel plates or waterproof coated steel plates, which can prevent moisture from penetrating from the sides of the building and enhance the waterproof performance of the structure.

[0060] In the present invention, preferably, one side of the upper waterproof plate 106 is installed on the ventilator base 103, and the other side of the upper waterproof plate 106 is installed on the steel plate main structure 1051, and the other side of the steel plate main structure 1051 is fixedly connected to the flat color plate 107 by waterproof self-tapping screws 109.

[0061] It should be noted that the material of the flat color plate 107 is a color coated steel plate, and the flat color plate 107 provides a flat surface and is used for walls, roofs or other areas that require decoration and protection.

[0062] In the present invention, preferably, the colored corrugated steel sheet roof 101 is fixed to the steel sheet by waterproof self-tapping screws 109, and the steel sheet main structure 1051 and the ventilator base 103 are welded and connected by the steel sheet.

[0063] It should be noted that the waterproof self-tapping screw 109 is made of stainless steel and has self-tapping threads. The waterproof self-tapping screw 109 is used to connect and fix waterproof boards and other structural components while maintaining waterproof performance. It should be noted that in order to reduce the probability of house leakage, the waterproof self-tapping screw 109 is used to fix the colored corrugated steel sheet roof 101, and waterproof glue can also be applied to the head of the waterproof self-tapping screw 109.

[0064] During the implementation process, the extended waterproof plate 1052 is placed at the connection between the stiffening plate 1053 and the steel plate main structure 1051 and connected by welding, so that the steel plate main structure 1051, the extended waterproof plate 1052, and the stiffening plate 1053 are combined to form a waterproof steel plate assembly 105, one side of the waterproof steel plate assembly 105 is connected to the flat color plate 107 by welding the steel plate, and the flat color plate 107 is fixed to the wall tile by waterproof self-tapping screws 109, and the other side of the waterproof steel plate assembly 105 is connected to the ventilator base 103, and the upper waterproof plate 106 is placed between the ventilator base 103 and the waterproof steel plate assembly 105 and is mutually welded by steel plates. The ventilator base 103 is fixed by screws The ventilator body 102 is fixedly installed by bolts, and both sides of the ventilator base 103 are connected to the side waterproof plates 104 by welding. The lower waterproof plate 108 is welded to the bottom of the ventilator base 103, and the upper waterproof plate 106 is placed between the ventilator base 103 and the waterproof steel plate assembly 105 and are welded to each other through steel plates. The side waterproof plates 104 are installed between the ventilator base 103 and the color corrugated steel roof 101, and the side waterproof plates 104 are welded to the ventilator base 103 and the color corrugated steel roof 101 through steel plates. The waterproof steel plate assembly 105 is installed on the inner or outer side of the color corrugated steel roof 101 by bolts to complete the assembly.

[0065] Embodiment 2

[0066] The invention also discloses a waterproof construction method for a steel plate of a roof ventilator in a metallurgical plant, comprising the following steps:

[0067] S1, manufacturing a waterproof steel plate assembly 105, and installing a steel plate main structure 1051 of the waterproof steel plate assembly 105;

[0068] Specific, combined Figure 1-Figure 5 The main steel plate structure 1051 of the waterproof steel plate assembly 105 adopts channel steel as the skeleton and is covered with steel plates. The size of the channel steel matches the height of the colored corrugated steel sheet roof 101. The main steel plate structure 1051 of the waterproof steel plate assembly 105 is welded to the roof strips. For the convenience of construction, it can be installed on the steel structure at the lifting machinery installation position simultaneously with the roof strips and the ventilator base 103 during the steel structure installation phase.

[0069] S2. A side waterproof plate 104 is provided on the left and right sides of the ventilator base 103 using a steel plate;

[0070] Specific, combined Figure 6There is a gap between the ventilator base 103 and the color corrugated steel roof 101, and it cannot be welded and will leak. A 4mm side waterproof plate 104 is welded to both sides of the ventilator base 103 and extends outward by at least two peaks to guide rainwater into the trough of the color corrugated steel roof 101. The end of the side waterproof plate 104 is bent into 135 degrees, and the vertical direction of the side waterproof plate 104 is spread to the top of the ventilator base 103. The horizontal direction of the side waterproof plate 104 has a slope of 2%.

[0071] S3, a lower waterproof plate 108 is provided at the lower end of the ventilator base 103 using a steel plate;

[0072] Specific, combined Figure 2-Figure 7 The lower waterproof plate 108 is arranged at the lower part of the ventilator base 103, and the lower waterproof plate 108 and the ventilator base 103 are connected by welding.

[0073] It should be noted that the lower waterproof board 108 and the colored corrugated steel sheet roof 101 are overlapped, the main function of which is to prevent rainwater from flowing back into the factory building from the bottom when it rains heavily. The width is 300mm.

[0074] S4. An extended waterproof plate 1052 is provided on both sides of the steel plate main structure 1051, and a stiffening plate 1053 is welded;

[0075] Specific, combined Figure 3-Figure 5 The waterproof steel plate assembly 105 is composed of a steel plate main structure 1051, an extended waterproof plate 1052, and a stiffening plate 1053. The waterproof steel plate assembly 105 has been installed during the steel structure installation stage, and the extended waterproof plate 1052 should be installed after the construction of the colored corrugated steel sheet roof 101 is completed. Its function is to divert rainwater on the steel plate main structure 1051 to flow into the trough of the colored corrugated steel sheet roof 101.

[0076] S5. An upper waterproof plate 106 is provided on the upper part of the ventilator base 103;

[0077] Specific, combined Figure 3 The function of the upper waterproof plate 106 is to close the gap between the ventilator base 103 and the waterproof steel plate assembly 105, and the steel plate is welded and connected.

[0078] It should be noted that the side waterproof plates 104 , the lower waterproof plates 108 , and the upper waterproof plates 106 enclose the ventilator base 103 into a closed space in the vertical direction, which can effectively prevent rainwater from flowing into the hole formed by the ventilator base 103 from the side.

[0079] S6. Use the flat color plate 107 to handle the overlapping waterproofing between the ridge and the waterproof steel plate assembly 105.

[0080] Specific, combined Figure 3 The waterproof steel plate assembly 105 is connected to the wall tiles in the ridge direction with a flat color plate 107 and fixed by waterproof self-tapping screws 109. According to the structural characteristics of the colored corrugated steel sheet roof 101, there may be a wall surface higher than the waterproof steel plate assembly 105 in the ridge direction, or there may be a wall surface lower than the waterproof steel plate assembly 105. If it is higher than the waterproof steel plate assembly 105, the flat color plate 107 is arranged on the inner side of the wall surface, such as Figure 3 As shown, if it is lower than the waterproof steel plate assembly 105, the flat color plate 107 is arranged on the outside of the wall.

[0081] In the present invention, preferably, the steel plate main structure 1051 generally uses channel steel as a skeleton and is covered with steel plates, and the steel plate main structure 1051 and the ventilator base 103 are installed synchronously.

[0082] In the present invention, preferably, the side waterproofing plate 104 is preferably extended outward by a wave crest, and the end of the side waterproofing plate 104 is preferably bent into 135 degrees.

[0083] In the present invention, preferably, both ends of the upper waterproof plate 106 , the extended waterproof plate 1052 , and the lower waterproof plate 108 are aligned with both ends of the side waterproof plate 104 .

[0084] In the present invention, preferably, the width of the lower waterproof plate 108 is 300 mm, and the side waterproof plates 104, the upper waterproof plate 106, and the lower waterproof plate 108 maintain the ventilator base 103 as a closed space in the vertical direction.

[0085] In the present invention, preferably, the V-shaped arrangement of the stiffening plates 1053 not only strengthens the steel plate main structure 1051 but also facilitates the diversion of rainwater.

[0086] The above-mentioned metallurgical factory roof ventilator steel plate waterproof construction method is adopted. The steel plate main structure 1051 of the waterproof steel plate assembly 105 is synchronously designed and constructed with the ventilator base 103. The installation can be completed with the help of a hoisting machine during the steel structure installation. The construction is relatively convenient and the cost is low. The steel plate roof replaces part of the colored corrugated steel plate roof 101. The steel plate roof and the ventilator base 103 can be connected by welding, and the waterproof effect is relatively good. In the later stage of the roof construction stage, it is mainly necessary to complete the connection waterproofing problem between the colored corrugated steel plate roof 101. During the construction, the roof is closed, the safety is good, and the construction is also relatively convenient.

[0087] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A steel plate structure for a roof ventilator in a metallurgical plant, characterized in that: The waterproof steel plate structure (1) is installed on the roof and is used to protect items in the house from being damaged by rain. The waterproof steel plate structure (1) includes A waterproof steel plate assembly (105), the waterproof steel plate assembly (105) is installed on the waterproof steel plate structure (1), the waterproof steel plate assembly (105) is used to connect with the roof strip, and the waterproof steel plate assembly (105) includes A steel plate main structure (1051), wherein the steel plate main structure (1051) is arranged on the colored corrugated steel plate roof (101), and an extended waterproof plate (1052) is arranged on both the left and right sides of the steel plate main structure (1051); A stiffening plate (1053), wherein the stiffening plate (1053) is arranged between the steel plate main structure (1051) and the extended waterproof plate (1052), and the stiffening plate (1053) facilitates the diversion of rainwater.

2. A metallurgical plant roof ventilator steel plate structure according to claim 1, characterized in that: The waterproof steel plate structure (1) also includes A ventilator body (102), the ventilator body (102) is used to ventilate a house, and the ventilator body (102) is installed on a ventilator base (103); A lower waterproof plate (108), wherein the lower waterproof plate (108) is disposed at the lower end of the ventilator base (103) and connected to the ventilator base (103); Side waterproof plates (104), wherein two groups of the side waterproof plates (104) are provided and are arranged on both sides of the ventilator base (103), and the ventilator base (103) is arranged on the colored corrugated steel sheet roof (101); An upper waterproof plate (106), wherein the upper waterproof plate (106) is disposed between the ventilator base (103) and the waterproof steel plate assembly (105); A flat color plate (107), wherein the flat color plate (107) is installed on one side of the waterproof steel plate assembly (105) through a lower waterproof plate (108), and the flat color plate (107) is arranged on the outer side of the wall.

3. A metallurgical plant roof ventilator steel plate structure according to claim 2, characterized in that: One side of the upper waterproof plate (106) is installed on the ventilator base (103), and the other side of the upper waterproof plate (106) is installed on the steel plate main structure (1051). The other side of the steel plate main structure (1051) is fixedly connected to the flat color plate (107) by waterproof self-tapping screws (109).

4. A metallurgical plant roof ventilator steel plate structure according to claim 2, characterized in that: The colored corrugated steel sheet roof (101) is fixed to the steel sheet by waterproof self-tapping screws (109), and the steel sheet main structure (1051) and the ventilator base (103) are welded to each other by the steel sheet.

5. The waterproof construction method of steel plate for roof ventilator in metallurgical factory is characterized by: A metallurgical plant roof ventilator steel plate structure according to any one of claims 1 to 3 comprises the following steps: S1, manufacturing a waterproof steel plate assembly (105), and installing a steel plate main structure (1051) of the waterproof steel plate assembly (105); S2. Using steel plates to set side waterproof plates (104) on the left and right sides of the ventilator base (103); S3, using a steel plate to set a lower waterproof plate (108) at the lower end of the ventilator base (103); S4. An extended waterproof plate (1052) is arranged on the left and right sides of the steel plate main structure (1051), and a stiffening plate (1053) is welded; S5. Arranging an upper waterproof plate (106) on the upper part of the ventilator base (103); S6. Use a flat color plate (107) to handle the overlapping waterproofing between the roof ridge and the waterproof steel plate assembly (105).

6. The waterproof construction method for steel plate of roof ventilator in metallurgical plant according to claim 5 is characterized in that: The steel plate main structure (1051) generally uses channel steel as a framework and is covered with steel plates. The steel plate main structure (1051) is installed synchronously with the ventilator base (103).

7. The waterproof construction method for steel plate of metallurgical plant roof ventilator according to claim 5 is characterized in that: The side waterproof plate (104) preferably extends outwards to form a wave crest, and the end of the side waterproof plate (104) is preferably bent into 135 degrees.

8. The waterproof construction method for steel plate of metallurgical plant roof ventilator according to claim 5 is characterized in that: The two ends of the upper waterproof plate (106), the extended waterproof plate (1052), and the lower waterproof plate (108) are preferably aligned with the two ends of the side waterproof plate (104).

9. The waterproof construction method for steel plate of roof ventilator in metallurgical plant according to claim 5, characterized in that: The width of the lower waterproof plate (108) is preferably 300 mm. The side waterproof plates (104), the upper waterproof plate (106) and the lower waterproof plate (108) maintain the ventilator base (103) as a closed space in the vertical direction.

10. The waterproof construction method for steel plate of metallurgical factory roof ventilator according to claim 5, characterized in that: The V-shaped arrangement of the stiffening plates (1053) not only strengthens the main steel plate structure (1051), but also facilitates the diversion of rainwater.

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