Protective Structures and Construction Methods for Lightweight Soil High Fill Subgrade

Abstract

This invention discloses a protective structure and construction method for a lightweight soil high-fill roadbed. The protective structure includes: a lightweight soil roadbed main body with a pavement structure on top; a crash barrier installed on the side of the pavement structure; a wire mesh and shotcrete structure installed on the slope surface of the lightweight soil roadbed main body, comprising a slope wire mesh and a shotcrete layer; multiple vertically arranged steel sections are embedded horizontally at intervals inside the lightweight soil roadbed main body; a rigid connection structure is provided between the wire mesh and shotcrete structure and the steel sections; and a pre-embedded steel mesh is embedded inside the lightweight soil roadbed main body. Using the above structure helps to shorten the construction period and reduce the engineering cost of the lightweight soil high-fill roadbed, while also improving its bearing capacity and deformation resistance, demonstrating good technical and economic benefits and high engineering practical value.

Description

Technical Field

[0001] This invention relates to the field of roadbed slope protection technology, and in particular to a protective structure and construction method for a lightweight soil high-fill roadbed. Background Technology

[0002] In recent years, lightweight aerated soil (hereinafter referred to as lightweight soil) has been widely used in soft soil areas and mountainous roadbed projects due to its low density, which can effectively reduce the requirements on the bearing capacity of the foundation when used as roadbed filler. Moreover, lightweight soil has the characteristics of good integrity, fast construction, no need for compaction, and rapid strength formation.

[0003] In practice, the relevant technologies for lightweight soil are gradually being improved, but some problems still exist. For example, there is the issue of slope protection for lightweight soil subgrades. Because lightweight soil is a brittle material, it is easily damaged if it is exposed to the air for a long time and subjected to rainwater erosion, sunlight, and external forces. For low-fill subgrades (fill height ≤ 4m), clay edging is mainly used to protect the subgrade slopes. For high-fill subgrades (fill height > 4m), precast panels are mainly used to protect the subgrade slopes. However, the construction period required for using precast panels is longer, and the engineering cost is higher. In addition, the bearing capacity and deformation resistance of traditional lightweight soil subgrades also need to be improved. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a protective structure for lightweight soil high-fill roadbeds, which is beneficial for shortening the construction period and reducing the engineering cost of lightweight soil high-fill roadbeds, while also improving the bearing capacity and deformation resistance of lightweight soil high-fill roadbeds, thus having good technical and economic benefits and high engineering practical value.

[0005] The present invention also proposes a construction method for protective structures applied to the above-mentioned lightweight soil high-fill roadbed.

[0006] According to a first aspect of the present invention, a protective structure for a lightweight soil high-fill roadbed includes: a lightweight soil roadbed body, on the top of which a pavement structure is provided; a crash barrier, which is provided on the side of the pavement structure; a wire mesh and shotcrete structure, which is provided on the slope surface of the lightweight soil roadbed body, the wire mesh and shotcrete structure including a slope wire mesh and a shotcrete layer, wherein a plurality of vertically arranged steel sections are embedded at intervals along the horizontal direction inside the lightweight soil roadbed body, a rigid connection structure is provided between the wire mesh and the steel sections, and the steel sections and the slope wire mesh are connected through the rigid connection structure; and a pre-embedded steel mesh, which is embedded inside the lightweight soil roadbed body.

[0007] The protective structure of the lightweight soil high fill roadbed according to the embodiments of the present invention has at least the following beneficial effects: the slope of the main body of the lightweight soil roadbed is protected by the mesh-reinforced shotcrete structure, which is simple in structure, convenient in construction and low in cost, which helps to shorten the construction period and reduce the engineering cost of the lightweight soil high fill roadbed. At the same time, the pre-embedded steel mesh is embedded inside the main body of the lightweight soil roadbed, which helps to improve the bearing capacity and deformation resistance of the lightweight soil high fill roadbed, so that the above-mentioned lightweight soil high fill roadbed has good technical and economic benefits and high engineering practical value.

[0008] According to some embodiments of the present invention, a plurality of pre-embedded steel meshes are embedded inside the lightweight soil subgrade body, and the plurality of pre-embedded steel meshes are spaced apart along the vertical direction.

[0009] According to some embodiments of the present invention, a first foundation is provided at the top of the lightweight earth roadbed body corresponding to the crash barrier, the first foundation being used to fix the steel section, and a second foundation is provided at the bottom of the lightweight earth roadbed body for fixing the steel section.

[0010] According to some embodiments of the present invention, the slope of the lightweight earth roadbed body is set in stages so that the slope of the lightweight earth roadbed body is stepped. Each level of the lightweight earth roadbed body has multiple steel sections and multiple pre-embedded steel meshes in the lightweight earth body. A third foundation for fixing the steel sections is provided at the junction of two adjacent levels of the lightweight earth roadbed body.

[0011] According to some embodiments of the present invention, a drainage structure for drainage is also included.

[0012] According to some embodiments of the present invention, the drainage structure includes a drainage ditch, a crushed stone cushion layer, and a first drainage pipe. The drainage ditch is located at the toe of the slope of the main body of the lightweight earth roadbed, the crushed stone cushion layer is located at the bottom of the main body of the lightweight earth roadbed, one end of the first drainage pipe is connected to the crushed stone cushion layer, and the other end of the first drainage pipe is connected to the drainage ditch.

[0013] According to some embodiments of the present invention, the drainage structure further includes a drainage channel and a second drainage pipe. The drainage channel is disposed on the side of the road structure and located inside the crash barrier. One end of the second drainage pipe is connected to the drainage channel, and the other end of the second drainage pipe is connected to the drainage ditch.

[0014] According to some embodiments of the present invention, the slope ratio of the main body of the lightweight soil roadbed is 1:n, where n is 0.1 to 0.2.

[0015] According to some embodiments of the present invention, the steel section is one of channel steel, I-beam steel, and angle steel.

[0016] A construction method according to a second aspect of the present invention, applied to a protective structure of a lightweight soil high-fill roadbed according to the first aspect of the present invention, includes the following steps:

[0017] S1: Level the site, compact the site according to the design requirements, set the steel section vertically according to the layout points, then pour the second foundation pad and the second foundation in sequence, then lay the crushed stone pad and lay the pre-embedded steel mesh, then prepare connecting steel bars of different lengths as part of the rigid connection structure according to the slope ratio of the main body of the lightweight soil roadbed. One end of the connecting steel bar has a thread, and the non-threaded end of the connecting steel bar is welded to the steel section. The threaded end of the connecting steel bar is installed with the template through nuts and washers.

[0018] S2: Pour lightweight soil to the predetermined thickness, then lay the embedded steel mesh, and then pour lightweight soil up to the top of the formwork;

[0019] S3: Continue laying the pre-embedded steel mesh and continue installing the formwork according to the steps in S1, and then continue pouring the lightweight soil according to the steps in S2;

[0020] S4: Continue pouring lightweight soil according to the steps in S3 until the design height of the lightweight soil subgrade is reached;

[0021] S5: In step S4, after each preset height of lightweight soil is poured, the slope is graded. In this case, steel is vertically installed in the lightweight soil body corresponding to each slope of the lightweight soil subgrade. At the same time, a third foundation for fixing the steel is poured at the junction of two adjacent slopes in the lightweight soil subgrade.

[0022] S6: After the poured lightweight soil has been cured to the designed age, remove the nuts and gaskets on the outside of the formwork, and then remove the formwork from top to bottom.

[0023] S7: Install the first drainage pipe at the gravel cushion layer;

[0024] S8: Prepare L-shaped steel bars as another part of the rigid connection structure, then weld the threaded ends of the L-shaped steel bars to the connecting steel bars, then weld or tie the slope mesh to the L-shaped steel bars, and then spray concrete to form a sprayed concrete layer, thus forming a mesh-sprayed concrete structure.

[0025] S9: After the sprayed concrete layer reaches the preset strength, the road structure, the first foundation and the crash barrier are set up, and drainage ditches, drainage channels and the second drainage pipe are also set up.

[0026] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a schematic diagram of the protective structure of a lightweight soil high-fill roadbed when the slope of the main body of the lightweight soil roadbed is not graded according to an embodiment of the present invention.

[0029] Figure 2 yes Figure 1 A partial structural diagram of the wire mesh and shotcrete structure shown in the diagram.

[0030] Figure 3 This is a schematic diagram of the protective structure of the lightweight soil high-fill roadbed when the slope of the main body of the lightweight soil roadbed is graded in an embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the structure involved in step S1 of the construction method of this embodiment of the invention.

[0032] Figure label:

[0033] Platform a, template b, inner gasket c1, outer gasket c2, inner nut d1, outer nut d2, lightweight soil subgrade main body 100, steel section 110, embedded steel mesh 120, first foundation 130, second foundation 140, third foundation 150, crushed stone cushion layer 160, second foundation cushion layer 170, connecting steel bar 180, L-shaped steel bar 190, pavement structure 200, drainage ditch 210, crash barrier 300, wire mesh shotcrete structure 400, slope wire mesh 410, shotcrete layer 420, drainage ditch 500, first drainage pipe 600, second drainage pipe 700. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of this invention, it should be understood that if directional descriptions are involved, such as up, down, front, back, left, right, etc., indicating the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings, it is only for the convenience of describing this invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0036] In the description of this invention, if words such as several, greater than, less than, exceeding, above, below, or within appear, then several means one or more, multiple means two or more, greater than, less than, exceeding, etc. are understood to exclude the number itself, and above, below, or within are understood to include the number itself.

[0037] In the description of this invention, the use of terms such as "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0038] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0039] Reference Figures 1 to 3 According to an embodiment of the present invention, the protective structure of the lightweight soil high fill roadbed includes a lightweight soil roadbed main body 100, a crash barrier 300, a wire mesh shotcrete structure 400, and a transversely arranged pre-embedded steel mesh 120.

[0040] A pavement structure 200 is installed on the top of the lightweight earth roadbed main body 100. A crash barrier 300 is installed on the side of the pavement structure 200. A wire mesh shotcrete structure 400 is installed on the slope surface of the lightweight earth roadbed main body 100. The wire mesh shotcrete structure 400 includes a slope wire mesh 410 and a shotcrete layer 420. Specifically, the slope wire mesh 410 is a steel mesh. Multiple vertically arranged steel sections 110 are embedded horizontally inside the lightweight earth roadbed main body 100. Specifically, the spacing between two adjacent steel sections 110 in the horizontal direction inside the lightweight earth roadbed main body 100 is 1m. A rigid connection structure is provided between the wire mesh shotcrete structure 400 and the steel sections 110. The steel sections 110 and the slope wire mesh 410 are connected by the rigid connection structure. A pre-embedded steel mesh 120 is embedded inside the lightweight earth roadbed main body 100.

[0041] The slope of the lightweight soil subgrade main body 100 is protected by a shotcrete structure 400 with wire mesh. The structure is simple, easy to construct and low in cost, which helps to shorten the construction period and reduce the engineering cost of the lightweight soil high fill subgrade. At the same time, the lightweight soil subgrade main body 100 is equipped with a pre-embedded steel mesh 120, which helps to improve the bearing capacity and deformation resistance of the lightweight soil high fill subgrade. Therefore, the above-mentioned lightweight soil high fill subgrade has good technical and economic benefits and high engineering practical value.

[0042] Reference Figure 1 and Figure 3In some embodiments, multiple pre-embedded steel meshes 120 are embedded inside the lightweight soil subgrade body 100. The multiple pre-embedded steel meshes 120 are arranged at intervals along the vertical direction, which is conducive to further improving the bearing capacity and deformation resistance of the lightweight soil high fill subgrade.

[0043] It should be noted that in some embodiments, a first foundation 130 is provided at the top of the lightweight earth roadbed body 100 corresponding to the crash barrier 300. The first foundation 130 can be used to fix the steel section 110. A second foundation 140 is provided at the bottom of the lightweight earth roadbed body 100 for fixing the steel section 110. For details, see [link to relevant documentation]. Figure 1 The slope of the main body 100 of the lightweight soil roadbed is not graded. At this time, the upper end of the steel section 110 is anchored to the first foundation 130 and the lower end of the steel section 110 is anchored to the second foundation 140. The steel section 110 is fixed by the first foundation 130 and the second foundation 140, which can bear the horizontal tension of the rigid connection structure and help reduce the horizontal stress on the main body 100 of the lightweight soil roadbed.

[0044] Furthermore, referring to Figure 3 In some embodiments, the slopes of the lightweight earth roadbed main body 100 are graded to create a stepped slope, forming a 1m-2m wide platform a at the junction of adjacent slopes. This graded slope design facilitates the pouring of lightweight earth by the construction unit and improves the overall stability of the lightweight earth high-fill roadbed. Furthermore, the platform a at the junction of adjacent slopes facilitates later maintenance and upkeep of the lightweight earth high-fill roadbed. Each slope of the lightweight earth roadbed main body 100 contains multiple steel sections 110 and multiple embedded steel meshes 120. A third foundation 150 is provided at the joint of the slope to fix the steel section 110. The steel section 110 is fixed by the first foundation 130, the second foundation 140 and the third foundation 150, so that it can bear the horizontal tension of the rigid connection structure and help reduce the horizontal stress on the main body 100 of the lightweight soil roadbed. Specifically, the slope of the main body 100 of the lightweight soil roadbed is graded according to the height, with each grade being 4m to 6m. Within 0.5m to 1.5m of the upper and lower bottom surfaces of the lightweight soil body corresponding to each grade of the slope of the main body 100 of the lightweight soil roadbed, a layer of pre-embedded steel mesh 120 is set every 50cm. The distance between the edge of each foundation (first foundation 130, second foundation 140 and third foundation 150) and the fixed steel section 110 is not less than 25cm.

[0045] It should be noted that some of the embodiments also include drainage structures for drainage, which helps to reduce the impact of water accumulation on the high-fill roadbed of lightweight soil.

[0046] Reference Figure 1 and Figure 3 In some embodiments, the drainage structure includes a drainage ditch 500, a crushed stone cushion layer 160, and a first drainage pipe 600. The drainage ditch 500 is located at the toe of the slope of the lightweight earth roadbed body 100, the crushed stone cushion layer 160 is located at the bottom of the lightweight earth roadbed body 100, one end of the first drainage pipe 600 is connected to the crushed stone cushion layer 160, and the other end of the first drainage pipe 600 is connected to the drainage ditch 500. By setting the crushed stone cushion layer 160 and the first drainage pipe 600, the accumulated water that seeps into the bottom of the lightweight earth roadbed body 100 can be drained to the drainage ditch 500.

[0047] Reference Figure 1 and Figure 3 In some embodiments, the drainage structure further includes a drainage channel 210 and a second drainage pipe 700. The drainage channel 210 is located on the side of the road structure 200 and inside the guardrail 300. One end of the second drainage pipe 700 is connected to the drainage channel 210, and the other end of the second drainage pipe 700 is connected to the drainage ditch 500. By setting up the drainage channel 210 and the second drainage pipe 700, it is beneficial to drain the accumulated water of the road structure 200 to the drainage ditch 500 in a timely manner, and to reduce the accumulation of water that seeps into the bottom of the lightweight soil subgrade body 100.

[0048] It should be noted that in some embodiments, the slope ratio of the lightweight soil subgrade main body 100 is 1:n, where n is 0.1 to 0.2. Specifically, n can be 0.1, 0.15, 0.2, or other values ​​between 0.1 and 0.2. This slope ratio is conducive to the diffusion of load stress in the lightweight soil high fill subgrade and the self-stability of the protective structure, making the structural stress of the lightweight soil high fill subgrade more reasonable, and at the same time helping to reduce the land occupation of the road.

[0049] It should be noted that in some of these embodiments, the steel section 110 is one of channel steel, I-beam, or angle steel.

[0050] The construction method according to an embodiment of the present invention, applied to the protective structure of the above-mentioned lightweight soil high-fill roadbed, includes the following steps:

[0051] S1: Level the site and compact it according to design requirements. Vertically install steel sections 110 according to the layout points. Then, pour the second foundation pad 170 and the second foundation 140 in sequence. Subsequently, lay the crushed stone pad 160 and lay the pre-embedded steel mesh 120. Then, prepare connecting steel bars 180 of different lengths as part of the rigid connection structure according to the slope ratio of the lightweight soil subgrade main body 100. One end of the connecting steel bar 180 is threaded. Weld the non-threaded end of the connecting steel bar 180 to the steel section 110. Install the template b on the threaded end of the connecting steel bar 180 using nuts and washers. For details, see [link to documentation]. Figure 4 Template b is fixed together by inner shim c1, inner nut d1, outer shim c2 and outer nut d2. During construction, errors may occur. At this time, the position of template b can be adjusted by adjusting the position of inner shim c1, inner nut d1, outer shim c2 and outer nut d2, which helps to reduce or even eliminate the impact of errors.

[0052] S2: Pour lightweight soil of the preset thickness, then lay the pre-embedded steel mesh 120, and then pour lightweight soil up to the top of formwork b;

[0053] S3: Continue laying the pre-embedded steel mesh 120 and continue installing the formwork b according to the steps in S1, and then continue pouring the lightweight soil according to the steps in S2;

[0054] S4: Continue pouring lightweight soil according to the steps in S3 until the design height of the lightweight soil subgrade body is 100mm.

[0055] S5: In step S4, after each preset height of lightweight soil is poured, the slope is graded. In this case, steel 110 is vertically installed in the lightweight soil body corresponding to each slope of the lightweight soil subgrade body 100. At the same time, a third foundation 150 for fixing the steel 110 is poured at the junction of two adjacent slopes in the lightweight soil subgrade body 100.

[0056] S6: After the poured lightweight soil has been cured to the designed age, remove the nuts and gaskets on the outside of the formwork b, that is, remove the outer gasket c2 and the outer nut d2, and then remove the formwork b from top to bottom.

[0057] S7: Install the first drainage pipe 600 at 160mm of the crushed stone cushion layer;

[0058] S8: Prepare L-shaped steel bar 190 as another part of the rigid connection structure, then weld the threaded end of L-shaped steel bar 190 to connecting steel bar 180, then weld or tie the slope mesh 410 to L-shaped steel bar 190, then spray concrete to form a sprayed concrete layer 420, thereby forming a mesh sprayed concrete structure 400.

[0059] S9: After the sprayed concrete layer 420 reaches the preset strength, the road structure 200, the first foundation 130 and the crash barrier 300 are set up. At the same time, the drainage ditch 500, the drainage channel 210 and the second drainage pipe 700 are set up. The first foundation 130 and the crash barrier 300 are cast as a whole. Of course, the first foundation 130 and the crash barrier 300 can also be cast in sequence. This is not limited here.

[0060] In the description of this specification, the use of terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A construction method, characterized in that, A protective structure applied to lightweight soil high-fill roadbeds, the protective structure for lightweight soil high-fill roadbeds comprising: The lightweight soil roadbed body has a pavement structure on its top. A crash barrier is provided on the side of the road surface structure; A shotcrete structure with wire mesh is installed on the slope surface of the lightweight earth roadbed. The shotcrete structure with wire mesh includes a slope wire mesh and a shotcrete layer. Multiple vertically arranged steel sections are embedded at horizontal intervals inside the lightweight earth roadbed. A rigid connection structure is provided between the shotcrete structure with wire mesh and the steel sections. The steel sections and the slope wire mesh are connected through the rigid connection structure. Pre-embedded steel mesh, wherein the pre-embedded steel mesh is embedded inside the lightweight soil subgrade body; The lightweight soil roadbed body is internally equipped with multiple pre-embedded steel meshes, which are spaced apart along the vertical direction. The top of the lightweight earth roadbed body is provided with a first foundation corresponding to the crash barrier. The first foundation can be used to fix the steel section. The bottom of the lightweight earth roadbed body is provided with a second foundation for fixing the steel section. The slope of the lightweight earth roadbed is set in stages so that the slope of the lightweight earth roadbed is stepped. Each level of the lightweight earth roadbed has multiple steel sections and multiple pre-embedded steel meshes in the lightweight earth corresponding to each level of the slope. A third foundation for fixing the steel sections is set at the junction of two adjacent levels of the lightweight earth roadbed. It also includes drainage structures for drainage; The drainage structure includes a drainage ditch, a crushed stone cushion layer, and a first drainage pipe. The drainage ditch is located at the toe of the slope of the main body of the lightweight earth roadbed. The crushed stone cushion layer is located at the bottom of the main body of the lightweight earth roadbed. One end of the first drainage pipe is connected to the crushed stone cushion layer, and the other end of the first drainage pipe is connected to the drainage ditch. The drainage structure also includes a drainage trough and a second drainage pipe. The drainage trough is located on the side of the road structure and inside the crash barrier. One end of the second drainage pipe is connected to the drainage trough, and the other end of the second drainage pipe is connected to the drainage ditch. The construction method includes the following steps: S1: Level the site, compact the site according to the design requirements, set the steel section vertically according to the layout points, then pour the second foundation pad and the second foundation in sequence, then lay the crushed stone pad and lay the pre-embedded steel mesh, then prepare connecting steel bars of different lengths as part of the rigid connection structure according to the slope ratio of the main body of the lightweight soil roadbed. One end of the connecting steel bar has a thread, and the non-threaded end of the connecting steel bar is welded to the steel section. The threaded end of the connecting steel bar is installed with the template through nuts and washers. S2: Pour lightweight soil to the predetermined thickness, then lay the embedded steel mesh, and then pour lightweight soil up to the top of the formwork; S3: Continue laying the pre-embedded steel mesh and continue installing the formwork according to the steps in S1, and then continue pouring the lightweight soil according to the steps in S2; S4: Continue pouring lightweight soil according to the steps in S3 until the design height of the lightweight soil subgrade is reached; S5: In step S4, after each preset height of lightweight soil is poured, the slope is graded. In this case, steel is vertically installed in the lightweight soil body corresponding to each slope of the lightweight soil subgrade. At the same time, a third foundation for fixing the steel is poured at the junction of two adjacent slopes in the lightweight soil subgrade. S6: After the poured lightweight soil has been cured to the designed age, remove the nuts and gaskets on the outside of the formwork, and then remove the formwork from top to bottom. S7: Install the first drainage pipe at the gravel cushion layer; S8: Prepare L-shaped steel bars as another part of the rigid connection structure, then weld the threaded ends of the L-shaped steel bars to the connecting steel bars, then weld or tie the slope mesh to the L-shaped steel bars, and then spray concrete to form a sprayed concrete layer, thus forming a mesh-sprayed concrete structure. S9: After the sprayed concrete layer reaches the preset strength, the road structure, the first foundation and the crash barrier are set up, and drainage ditches, drainage channels and the second drainage pipe are also set up.

2. The construction method as described in claim 1, characterized in that, The slope ratio of the main body of the lightweight soil roadbed is 1:n, where n is 0.1 to 0.

2.

3. The construction method as described in claim 1, characterized in that, The steel profile is one of the following: channel steel, I-beam, and angle steel.

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