Fixing device for installing air pipe in building and air pipe reinforcing device

Abstract

A fixing device for installing an air duct in a building and an air duct reinforcing device.The fixing device comprises two sets of fixing supports, the two sets of fixing supports are the upper-row fixing supports and the lower-row fixing supports respectively, and the upper-row fixing supports and the lower-row fixing supports are welded to an upper-row steel structure and a lower-row steel structure respectively; the upper-row fixing support comprises a first front fixing support, a first rear fixing support and an adjusting screw rod, the first front fixing support and the first rear fixing support are distributed in a butt-clamping mode, and the lower-row fixing support comprises a bottom support, a second front fixing support and a second rear fixing support. The second front fixing support and the second rear fixing support are distributed in a butt-clamping mode and welded to the upper end face of the bottom support, the first front fixing support and the first rear fixing support clamp one end of the air pipe in a butt-clamping mode, and the second front fixing support and the second rear fixing support clamp the other end of the air pipe in a butt-clamping mode. By arranging the two sets of fixing supports, the air pipe can be installed on two sets of steel structures of a building.

Description

Technical Field

[0001] The utility model relates to the technical field of air duct installation, in particular to a fixing device and an air duct reinforcement device for installing air ducts in buildings. Background Art

[0002] Air ducts are pipes used in ventilation or air conditioning systems of industrial and civil buildings. They are a kind of municipal infrastructure that achieves air circulation and reduces the concentration of harmful gases. The following problems exist in the existing air duct installation process:

[0003] The existing air duct cross-sectional dimensions are 4500mm×550mm, which is relatively large in width and height and very flat, and belongs to a large flat air duct. Since the steel structure of the building does not have a traditional air duct installation fixing point, the installation of the large flat air duct cannot be achieved. Therefore, the existing technology lacks a fixing structure for realizing the upright installation of the air duct on the building steel structure.

[0004] In addition, the existing air ducts are generally stamped from iron sheets, and then the staff use flanges to splice and fix each section of the air duct. For large flat air ducts, the long side span is large, and the air duct made of iron sheets has weak pressure resistance. In addition, the thickness of the air duct is usually relatively thin, so its own bending strength is weak. Long-term use will cause the air duct to be deformed due to stress, thereby affecting the transmission speed of air inside the air duct. Utility Model Content

[0005] In view of this, in order to solve the technical problems existing in the prior art, the utility model provides a method of welding two groups of fixing brackets on the steel structure of a building, and clamping the air duct with a first front fixing bracket, a first rear fixing bracket and a second front fixing bracket of the two groups of fixing brackets, so as to achieve the fixation and installation of the air duct and the steel structure, and utilize the two ends of the adjusting screw to pass through and connect the first front fixing bracket and the first rear fixing bracket respectively, and achieve the fastening of the air duct by tightening the adjusting nut, thereby improving the firmness, stability and safety of the air duct installation, and reinforcing the air duct by arranging ribs, an internal support structure and a combination of reinforcement methods in the air duct to prevent the air duct from deformation.

[0006] The utility model solves the above technical problems through the following technical solutions:

[0007] On the one hand, the utility model provides a fixing device for installing an air duct in a building, including a fixing device for installing the air duct on two groups of steel structures of the building, the two groups of steel structures are respectively an upper row of steel structures and a lower row of steel structures, the upper row of steel structures and the lower row of steel structures are symmetrically distributed up and down, the fixing device includes two groups of fixing brackets, the two groups of fixing brackets are respectively an upper row of fixing brackets and a lower row of fixing brackets, the upper row of fixing brackets and the lower row of fixing brackets are respectively welded to the upper row of steel structures and the lower row of steel structures, the upper row of fixing brackets include a first front fixing bracket, a first rear fixing bracket, and an adjusting screw, the first front fixing bracket and the first rear fixing bracket are distributed in a clamping type, and the adjusting screw The screw rod vertically passes through between the first front fixing bracket and the first rear fixing bracket, and the two ends of the adjusting screw rod are threadedly connected with adjusting nuts, and the distance between the first front fixing bracket and the first rear fixing bracket can be tightened by tightening the adjusting nuts. The lower row of fixing brackets includes a bottom bracket, a second front fixing bracket, and a second rear fixing bracket. The second front fixing bracket and the second rear fixing bracket are arranged in a clamping manner and are welded to the upper end surface of the bottom bracket. The bottom bracket is welded to the upper end of the lower row of steel structures. The first front fixing bracket and the first rear fixing bracket clamp one end of the air duct in a clamping manner, and the second front fixing bracket and the second rear fixing bracket clamp the other end of the air duct in a clamping manner.

[0008] Furthermore, the adjusting screw is a bidirectional screw, and the diameter of the adjusting screw is 12 mm.

[0009] Further, the first rear fixed bracket includes a first support cross bar, a first support vertical bar, and a first support diagonal bar, the first support cross bar and the first support vertical bar are vertically connected, and the two ends of the first support diagonal bar are respectively connected to the first support cross bar and the first support vertical bar to form a first rear fixed bracket with a triangular structure, and the second rear fixed bracket includes a second support cross bar, a second support vertical bar, and a second support diagonal bar, the second support cross bar and the second support vertical bar are vertically connected, and the two ends of the second support diagonal bar are respectively connected to the second support cross bar and the second support vertical bar to form a second rear fixed bracket with a triangular structure.

[0010] Furthermore, the bottom bracket is made of 6# galvanized channel steel, and the first front fixed bracket, the first rear fixed bracket, the second front fixed bracket, and the second rear fixed bracket are made of L50×5 galvanized angle steel.

[0011] Furthermore, the air duct is formed by splicing a plurality of air duct sections, and the air duct is a flat rectangular air duct.

[0012] On the other hand, the utility model also provides an air duct reinforcement device, including an air duct reinforcement device installed inside the air duct, the air duct reinforcement device includes a plurality of ribs, an internal support structure, and a plurality of angle steel internal reinforcement members, the plurality of ribs are arranged parallel to each other and spaced apart on the wall of the air duct, the internal support structure is installed inside the air duct along a vertical direction, the internal support structure supports the air duct, and the plurality of angle steel internal reinforcement members are evenly distributed in the longitudinal direction of the air duct and are fixed to the air duct.

[0013] Furthermore, the internal support structure includes a support member, a support fixing member, and a reinforcement gasket. The two ends of the support member pass through the upper and lower tube walls of the air duct respectively. The reinforcement gasket is sleeved on the two ends of the support member and connected to the upper and lower sides of the air duct. The two ends of the support member are fixed to the upper and lower sides of the air duct through the support fixing member.

[0014] Furthermore, a gasket is provided at the connection between the supporting fixing member and the supporting member, and the gasket is sleeved on both ends of the supporting member.

[0015] Furthermore, each angle steel inner reinforcement member is a L50×50 angle steel, and the cross-section of each angle steel inner reinforcement member is triangular.

[0016] Compared with the prior art, the technical solution of the utility model has at least the following beneficial effects:

[0017] (1) The fixing device of the utility model includes two groups of fixing brackets, the two groups of fixing brackets are respectively an upper row of fixing brackets and a lower row of fixing brackets, the upper row of fixing brackets and the lower row of fixing brackets are respectively welded to the upper row of steel structures and the lower row of steel structures, the upper row of fixing brackets includes a first front fixing bracket, a first rear fixing bracket, and an adjusting screw, the first front fixing bracket and the first rear fixing bracket are arranged in a sandwich type, the adjusting screw vertically passes between the first front fixing bracket and the first rear fixing bracket, the two ends of the adjusting screw are threadedly connected with adjusting nuts, and the distance between the first front fixing bracket and the first rear fixing bracket can be tightened by tightening the adjusting nuts, the lower row of fixing brackets includes a bottom bracket, a second front fixing bracket, and a second rear fixing bracket, the second front fixing bracket and the second rear fixing bracket are arranged in a sandwich type and are welded to the upper end surface of the bottom bracket, and the bottom bracket is welded to the upper end of the lower row of steel structures. The utility model clamps one end of the air duct by a first front fixing bracket and a first rear fixing bracket, and then uses an adjusting screw to connect the first front fixing bracket and the first rear fixing bracket, and clamps the other end of the air duct by a second front fixing bracket and a second rear fixing bracket. By fixing two groups of fixing brackets on two groups of steel structures of a building, and then clamping the air duct by the two groups of fixing brackets, the air duct can be upright installed on the two groups of steel structures of the building, solving the technical problem in the prior art that the air duct cannot be installed on the steel structure of a building. By providing two groups of fixing brackets, the stability of the air duct clamping can be improved, avoiding the problem of unstable installation or clamping of the air duct, and improving safety.

[0018] (2) The reinforcing device of the utility model includes a plurality of ribs, an internal support structure, and a plurality of angle steel internal reinforcements. The plurality of ribs are arranged parallel to each other and spaced apart on the wall of the air duct. The internal support structure is installed inside the air duct along the vertical direction. The internal support structure supports the air duct. The plurality of angle steel internal reinforcements are evenly distributed in the longitudinal direction of the air duct and are fixed to the air duct. By arranging a plurality of ribs arranged parallel to each other and spaced apart on the wall of the air duct, the strength of the air duct can be improved and deformation of the air duct can be prevented. By arranging an internal support structure inside the air duct, the bending resistance of the upper and lower sides of the air duct can be improved, the bearing capacity of the air duct to the outside world can be improved, the tolerance of the air duct to external pressure can be improved, and the bending resistance of the air duct can be improved, thereby improving the quality of the air duct.

[0019] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following is a detailed description in combination with the preferred embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the utility model of installing the air duct on a building through a fixing device;

[0021] Figure 2 It is a schematic diagram of the relationship between the upper row fixed bracket and the upper row steel structure of the utility model;

[0022] Figure 3 It is a structural schematic diagram of the first rear fixing bracket in the utility model;

[0023] Figure 4 It is a structural schematic diagram of the second rear fixing bracket in the utility model;

[0024] Figure 5 It is a schematic diagram of the relationship between the wind pipe reinforcement device and the wind pipe in the utility model;

[0025] Figure 6 This is a schematic diagram of the relationship between the internal support structure and the air duct of the utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the internal support structure of the utility model;

[0027] Figure 8 This is a large-scale drawing of the corrugated ribs of the present utility model.

[0028] In the figure: fixing device 1, fixing bracket 11, first front fixing bracket 111, first rear fixing bracket 112, first supporting cross bar 1121, first supporting vertical bar 1122, first supporting diagonal bar 1123, adjusting screw 113, adjusting nut 114, second rear fixing bracket 115, second supporting cross bar 1151, second supporting vertical bar 1152, second supporting diagonal bar 1153, second front fixing bracket 116, bottom bracket 117, building 2, steel structure 21, upper row steel structure 211, lower row steel structure 212, steel column 22, air duct 3, air duct reinforcement device 4, rib 41, inner supporting structure 42, supporting member 421, supporting fixing member 422, reinforcing washer 423, gasket 424, angle steel inner reinforcement member 43. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with the accompanying drawings, which are part of this specification and illustrate the principle of the present invention through embodiments. Other aspects, features and advantages of the present invention will become clear through the detailed description. In the drawings referred to, the same or similar parts in different figures are represented by the same reference numerals.

[0030] like Figure 1-Figure 4As shown, the first embodiment of the utility model provides a fixing device 1 for installing an air duct 3 in a building 2, including a fixing device 1 for installing the air duct 3 on two groups of steel structures 21 of the building 2, wherein the two groups of steel structures 21 are respectively an upper row of steel structures 211 and a lower row of steel structures 212, and the upper row of steel structures 211 and the lower row of steel structures 212 are symmetrically distributed in the upper and lower directions, and the fixing device 1 includes two groups of fixing brackets 11, and the two groups of fixing brackets 11 are respectively an upper row of fixing brackets and a lower row of fixing brackets, and the upper row of fixing brackets and the lower row of fixing brackets are respectively The fixed brackets are welded to the upper steel structure 211 and the lower steel structure 212 respectively. The upper fixed bracket includes a first front fixed bracket 111, a first rear fixed bracket 112, and an adjusting screw 113. The first front fixed bracket 111 and the first rear fixed bracket 112 are arranged in a clamping manner. The adjusting screw 113 is located between the first front fixed bracket 111 and the first rear fixed bracket 112 and is threadedly connected to the front and first rear fixed brackets 112. The adjusting screw 113 vertically passes through the first front fixed bracket 111 and the first rear fixed bracket 112. 12, both ends of the adjusting screw 113 are threadedly connected with adjusting nuts 114, and the distance between the first front fixing bracket 111 and the first rear fixing bracket 112 can be tightened by tightening the adjusting nuts 114. The lower row of fixing brackets includes a bottom bracket 117, a second front fixing bracket 116, and a second rear fixing bracket 115. The second front fixing bracket 116 and the second rear fixing bracket 115 are arranged in a clamping manner and welded to the upper end surface of the bottom bracket 117. The bottom bracket 117 is welded to the upper end of the lower row of steel structures 212. Thereby, the connection between the lower row of fixed brackets and the lower row of steel structures 212 is realized; the first front fixed bracket 111 and the first rear fixed bracket 112 clamp one end of the air duct 3; the second front fixed bracket 116 and the second rear fixed bracket 115 clamp the other end of the air duct 3; the two ends of the adjusting screw 113 respectively pass through the first front fixed bracket 111 and the first rear fixed bracket 112 and are fastened by the adjusting nut 114; the adjusting screw 113 of the utility model is a bidirectional screw, and the diameter of the adjusting screw 113 is 12 mm. There is another reason why the utility model provides two groups of fixing brackets 11. Since the air duct 3 is a large flat air duct, when the air duct 3 is installed on the side wall, considering the space utilization, if the air duct 3 is laid flat, it will occupy a large amount of horizontal space. Therefore, the air duct 3 can only be installed upright. Since the center of gravity of the upright installation is higher, it is necessary to provide two groups of fixing brackets 11. The two groups of fixing brackets 11 can be provided to install the air duct 3 upright on the two groups of steel structures 21 of the building 2, so as to realize the installation and fixation of the air duct 3 and the steel structure 21. The opposite clamping of the air duct 3 can ensure the firmness and stability of the upright installation of the air duct 3.

[0031] The air duct 3 of the utility model is formed by splicing together a plurality of air duct sections. The air duct 3 is a large flat rectangular air duct 3. The standard length of each air duct section is 1200 mm. Each air duct section is spliced ​​with angle steel flanges. The building 2 includes two groups of steel structures 2 and steel columns 22. When the air duct 3 is installed, the long side of the air duct 3 is parallel to the steel column 22 of the building 2, and the short side of the air duct 3 is placed on two groups of fixed brackets 11 of the two groups of steel structures 2.

[0032] For locations without traditional installation fixing points, one end of the air duct 3 is clamped by the first front fixing bracket 111 and the first rear fixing bracket 112, and then the first front fixing bracket 111 and the first rear fixing bracket 112 are connected by the adjusting screw 113. The other end of the air duct 3 is clamped by the second front fixing bracket 116 and the second rear fixing bracket 115. This can improve the stability of the clamping of the air duct 3, avoid the problem of unstable installation or clamping of the air duct 3, and achieve the purpose of fixing and installing the air duct 3 on the two groups of steel structures 21.

[0033] The adjusting screw 113 of the utility model is set as a bidirectional screw, and the diameter of the adjusting screw 113 is 12 mm. The adjusting screw 113 is used to connect the upper first front fixing bracket 111 and the first rear fixing bracket 112, which can improve the stability of the first front fixing bracket 111 and the first rear fixing bracket 112 clamping the air duct 3.

[0034] When the embodiment of the utility model is specifically implemented, the first rear fixed bracket 112 includes a first support cross bar 1121, a first support vertical bar 1122, and a first support diagonal bar 1123. The first support cross bar 1121 and the first support vertical bar 1122 are vertically connected, and the two ends of the first support diagonal bar 1123 are respectively connected to the first support cross bar 1121 and the first support vertical bar 1122 to form a first rear fixed bracket 112 with a triangular structure; the second rear fixed bracket 115 includes a second support cross bar 1151, a second support vertical bar 1152, and a second support diagonal bar 1153. The second support The cross bar 1151 and the second support vertical bar 1152 are vertically connected, and the two ends of the second support diagonal bar 1153 are respectively connected to the second support cross bar 1151 and the second support vertical bar 1152 to form a second rear fixed bracket 115 with a triangular structure. The first rear fixed bracket 112 and the second rear fixed bracket 115 are set to a triangular structure, and the bottom bracket 117 is made of 6# galvanized channel steel, and the first front fixed bracket 111, the first rear fixed bracket 112, the second front fixed bracket 116, and the second rear fixed bracket 115 are made of L50×5 galvanized angle steel.

[0035] like Figure 5-Figure 8As shown, in addition, embodiment 2 of the present invention further provides an air duct reinforcement device 4, including an air duct reinforcement device 4 installed inside the air duct 3, the air duct reinforcement device 4 includes a plurality of ribs 41, an internal support structure 42, and a plurality of angle steel internal reinforcement members 43, the plurality of ribs 41 are arranged parallel to each other and spaced apart on the wall of the air duct 3, the internal support structure 42 is installed inside the air duct 3 along the vertical direction, the internal support structure 42 supports the air duct 3, and the plurality of angle steel internal reinforcement members 43 are evenly distributed in the longitudinal direction of the air duct 3 and are fixed to the air duct 3. The processing plant presses, bites and folds the galvanized steel plate 52 to make an L-shaped plate semi-finished air duct 3, and processes the galvanized angle steel into the flange of the air duct 3, and then transports the materials to the site. A handheld electric seaming machine is used to sew the L-shaped air duct 3 semi-finished product at the processing site on the construction site. The two end faces of the sutured air duct 3 are parallel, without warping, and the surface unevenness is no more than 5mm. The long side of the air duct 3 is greater than 630mm. A number of ribs 41, an internal support structure 42, and an angle steel internal reinforcement 43 are installed on the air duct 3. The reinforcement of the ribs 41 is carried out in the factory, and the internal support structure 42 and the angle steel internal reinforcement 43 are carried out at the on-site processing site, thereby completing the forming of the air duct 3.

[0036] When the utility model is implemented, each rib 41 is in a convex shape, and a plurality of ribs 41 are arranged in parallel and spaced apart in the horizontal and vertical directions of the wall of the air duct 3, so as to reinforce the wall of the air duct 3 and prevent the wall of the air duct 3 from being deformed. The plurality of ribs 41 are evenly spaced apart, and the spacing is 200 mm. Arranging a plurality of ribs 41 in parallel and spaced apart on the wall of the air duct 3 can improve the strength of the air duct 3 and prevent the air duct 3 from being deformed.

[0037] The internal support structure 42 of the utility model includes a support member 421, a support fixing member 422, and a reinforcement washer 423. The two ends of the support member 421 pass through the upper and lower tube walls of the air duct 3 respectively. The reinforcement washer 423 is sleeved on the two ends of the support member 421 and connected to the upper and lower sides of the air duct 3. The two ends of the support member 421 are fixed to the upper and lower sides of the air duct 3 through the support fixing member 422. In specific implementation, the reinforcement washer 423 is a 60mm diameter washer, the side length of the support member 421 is equal to that of the air duct 3, the support member 421 is an M10 through-thread screw, and the support fixing member 422 is an M10 nut. A gasket 424 is provided at the connection between the support fixing member 422 and the support member 421, and the gasket 424 sleeves the two ends of the support member 421. The utility model sets an internal support structure 42 in the air duct 3, which can improve the bending resistance of the upper and lower sides of the air duct 3, improve the bearing capacity of the air duct 3 to the outside world, improve the tolerance of the air duct 3 to external pressure, and improve the bending resistance of the air duct 3.

[0038] In specific implementation, each angle steel inner reinforcement member 43 of the utility model is an L50×50 angle steel, and the cross section of each angle steel inner reinforcement member 43 is triangular. The length of the angle steel inner reinforcement member 43 is equal to the length of the air duct 3, and a plurality of angle steel inner reinforcement members 43 are parallel to the air duct 3. The angle steel inner reinforcement member 43 is riveted to the inner wall of the air duct 3 by rivets. The distance between the riveting points of the angle steel inner reinforcement member 43 and the air duct 3 should not be greater than 220mm, and the rivets are Φ5.5mm rivets. The provision of a plurality of angle steel inner reinforcement members 43 plays an auxiliary anti-bending role, thereby improving the quality of the air duct 3.

[0039] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A fixing device for installing an air duct in a building, characterized in that: The invention comprises a fixing device for installing the air duct on two sets of steel structures of the building, the two sets of steel structures are respectively an upper row steel structure and a lower row steel structure, the upper row steel structure and the lower row steel structure are symmetrically distributed in the upper and lower directions, the fixing device comprises two sets of fixing brackets, the two sets of fixing brackets are respectively an upper row fixing bracket and a lower row fixing bracket, the upper row fixing bracket and the lower row fixing bracket are respectively welded to the upper row steel structure and the lower row steel structure, the upper row fixing bracket comprises a first front fixing bracket, a first rear fixing bracket, and an adjusting screw, the first front fixing bracket and the first rear fixing bracket are arranged in a clamping type, the adjusting screw vertically passes through the first front fixing bracket and Between the first and rear fixed brackets, both ends of the adjusting screw are threadedly connected with adjusting nuts, and the distance between the first front fixed bracket and the first rear fixed bracket can be tightened by tightening the adjusting nuts. The lower row of fixed brackets includes a bottom bracket, a second front fixed bracket, and a second rear fixed bracket. The second front fixed bracket and the second rear fixed bracket are arranged in a clamping manner and are welded to the upper end surface of the bottom bracket. The bottom bracket is welded to the upper end of the lower row of steel structures. The first front fixed bracket and the first rear fixed bracket clamp one end of the air duct in a clamping manner, and the second front fixed bracket and the second rear fixed bracket clamp the other end of the air duct in a clamping manner.

2. The fixing device for installing an air duct in a building according to claim 1, characterized in that: The adjusting screw is a bidirectional screw, and the diameter of the adjusting screw is 12 mm.

3. The fixing device for installing an air duct in a building according to claim 1, characterized in that: The first rear fixed bracket includes a first support cross bar, a first support vertical bar, and a first support diagonal bar. The first support cross bar and the first support vertical bar are vertically connected, and the two ends of the first support diagonal bar are respectively connected to the first support cross bar and the first support vertical bar to form a first rear fixed bracket with a triangular structure. The second rear fixed bracket includes a second support cross bar, a second support vertical bar, and a second support diagonal bar. The second support cross bar and the second support vertical bar are vertically connected, and the two ends of the second support diagonal bar are respectively connected to the second support cross bar and the second support vertical bar to form a second rear fixed bracket with a triangular structure.

4. The fixing device for installing an air duct in a building according to claim 1, characterized in that: The bottom bracket is made of 6# galvanized channel steel, and the first front fixed bracket, the first rear fixed bracket, the second front fixed bracket, and the second rear fixed bracket are made of L50×5 galvanized angle steel.

5. The fixing device for installing an air duct in a building according to claim 1, characterized in that: The air duct is formed by splicing a plurality of air duct sections, and the air duct is a flat rectangular air duct.

6. An air duct reinforcement device, comprising the air duct reinforcement device installed inside the air duct as claimed in claim 1, characterized in that: The air duct reinforcement device includes a plurality of ribs, an internal support structure, and a plurality of angle steel internal reinforcement members. The plurality of ribs are arranged parallel to each other and spaced apart on the wall of the air duct. The internal support structure is installed inside the air duct along the vertical direction. The internal support structure supports the air duct. The plurality of angle steel internal reinforcement members are evenly distributed in the longitudinal direction of the air duct and are fixed to the air duct.

7. The air duct reinforcement device according to claim 6, characterized in that: The inner support structure includes a support member, a support fixing member, and a reinforcement gasket. The two ends of the support member pass through the upper and lower tube walls of the air duct respectively. The reinforcement gasket is sleeved on the two ends of the support member and connected to the upper and lower sides of the air duct. The two ends of the support member are fixed to the upper and lower sides of the air duct through the support fixing member.

8. The air duct reinforcement device according to claim 7, characterized in that: A gasket is provided at the connection between the supporting fixing member and the supporting member, and the gasket is sleeved on both ends of the supporting member.

9. The air duct reinforcement device according to claim 6, characterized in that: The inner reinforcement part of each angle steel is a L50×50 angle steel, and the cross section of the inner reinforcement part of each angle steel is triangular.

Images