Totally-closed bottom-holding protection device for continuous beam hanging basket and construction method of totally-closed bottom-holding protection device
By adopting a fully enclosed rigid bottom protection device in the construction of continuous beam bridges using hanging baskets, combined with steel pipe supports and protective nets, the problem of falling objects endangering the safety of vehicles below was solved, achieving a high-strength and breathable protective effect, and improving construction quality and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-15
- Publication Date
- 2026-04-03
AI Technical Summary
In the construction of continuous beam bridges using formwork, existing technologies are insufficient to effectively prevent falling objects such as concrete and tools from endangering the safety of vehicles below, especially when crossing highways or railways, where there is a lack of a high-strength, well-ventilated, fully enclosed bottom protection system.
A fully enclosed rigid bottom protection device is adopted, including a rigid bottom, precision rolled threaded steel bars, steel pipe supports and protective netting. The rigid bottom is connected to the continuous beam hanging basket, and together with the steel pipe supports and protective netting, a stable structure is formed to ensure construction safety.
This provides a robust, well-sealed, and highly safe protective system that improves construction quality, accelerates construction progress, ensures the safety and stability of bridge construction, and brings significant economic benefits.
Smart Images
Figure CN121781523A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of bridge construction, specifically to a fully enclosed bottom protection device for continuous beam hanging baskets and its construction method. Background Technology
[0002] With the rapid development of transportation infrastructure construction such as highways and municipal works, continuous beam bridges are widely used due to their advantages such as strong spanning capacity, structural stability, fast construction speed, and low economic cost. However, in the construction of continuous beam bridges using cantilever formwork, when the beam needs to cross busy traffic lines such as highways and railways, preventing falling concrete, tools, and other debris from endangering the safety of vehicles below is of paramount importance. Therefore, to ensure the safety of bridge construction personnel and the safety of existing traffic lines below, there is an urgent need for a fully enclosed bottom protection system with high protective strength, good ventilation, and high reliability. Summary of the Invention
[0003] In order to solve one or more technical problems existing in the prior art, the present invention provides a fully enclosed bottom protection device for continuous beam hanging baskets and its construction method.
[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: The present invention provides a fully enclosed bottom protection device for continuous beam hanging baskets, including a rigid bottom, precision rolled threaded steel bars, steel pipe supports and a protective net. The rigid bottom is a cubic closed structure with an open top. Multiple precision rolled threaded steel bars for connecting the continuous beam hanging basket are vertically fixed to the bottom wall of the rigid bottom. A ring of steel pipe supports is fixed on the outer peripheral side wall of the rigid bottom. A through-passage is reserved in the middle of one side of the steel pipe supports. A protective net is laid and fixed on the steel pipe supports.
[0005] The beneficial effects of the present invention are as follows: The fully enclosed bottom protection device for continuous beam hanging baskets of the present invention adopts a fully enclosed rigid bottom, providing a fully enclosed bottom protection system for continuous beam hanging baskets with a robust structure, strong sealing performance, and high safety performance, thereby improving construction quality and accelerating construction progress.
[0006] Based on the above technical solution, the present invention can be further improved as follows.
[0007] Furthermore, the rigid bottom includes a bottom plate and side plates. A ring of the side plates is vertically fixed around the perimeter of the bottom plate. The lower end of the precision-rolled threaded steel bar passes through the bottom plate and is fixedly connected to the bottom plate by a first nut.
[0008] Furthermore, a load-bearing longitudinal beam is fixed to the lower surface of the base plate, and a load-bearing crossbeam is vertically fixed on the load-bearing longitudinal beam. The load-bearing crossbeam extends along the direction of entry and exit perpendicular to the entry and exit channel. The lower end of the precision rolled threaded steel bar passes through the load-bearing crossbeam and is fixedly connected to the load-bearing crossbeam by a first nut.
[0009] The beneficial effects of adopting the above-mentioned further solutions are: by setting load-bearing horizontal beams and load-bearing vertical beams, the structure has better strength and stability, and can achieve a good load-bearing effect.
[0010] Furthermore, the load-bearing crossbeam is a double-slotted channel steel, and the lower end of the precision-rolled threaded steel passes through the middle splice of the double-slotted channel steel.
[0011] The beneficial effects of adopting the above-mentioned further scheme are: by setting up double-channel steel, it is convenient to connect the precision rolled threaded steel bars stably, resulting in high structural strength and good stability.
[0012] Furthermore, at least two load-bearing crossbeams are provided.
[0013] Furthermore, the fine-rolled threaded steel bars are arranged in at least two rows along the inlet and outlet direction of the inlet and outlet channel, and each row includes multiple fine-rolled threaded steel bars arranged at intervals along the inlet and outlet direction perpendicular to the inlet and outlet channel.
[0014] The beneficial effect of adopting the above-mentioned further scheme is that by setting two rows of finely rolled threaded steel bars, the connection between the rigid bottom and the continuous beam hanging basket is more stable and reliable.
[0015] Furthermore, the height of the steel pipe support is at least twice the height of the precision-rolled threaded steel bar.
[0016] Furthermore, the bottom periphery of the rigid support is provided with a ring of connecting channel steel with the opening facing upward; the steel pipe support includes a horizontal steel pipe and a vertical steel pipe, the lower end of the vertical steel pipe is vertically fixed in the corresponding connecting channel steel, and the horizontal steel pipe is vertically fixed on the vertical steel pipe.
[0017] The beneficial effect of adopting the above-mentioned further solution is that by setting the connecting channel steel, it is easier to connect and fix the steel pipe support.
[0018] Furthermore, a connecting hole is provided at preset intervals on the connecting channel steel, and the lower end of the vertical steel pipe passes through the connecting hole and is welded and fixed to the connecting channel steel.
[0019] The present invention also provides a construction method for a fully enclosed bottom protection device for a continuous beam hanging basket as described above, comprising the following steps: S1. Level the site at the assembly location, weld multiple metal plates according to the overall structural dimensions of the rigid bottom to form the rigid bottom, fix multiple precision-rolled threaded steel bars on the bottom wall of the rigid bottom; weld and fix a ring of connecting channel steel around the bottom perimeter of the rigid bottom, with the opening of the connecting channel steel facing upward, and open a connecting hole at a preset distance on the connecting channel steel. S2, the fine-rolled threaded steel is suspended by a suspension mechanism to lift the rigid bottom, and multiple fine-rolled threaded steel bars are used to fix the rigid bottom to the continuous beam hanging basket. The multiple fine-rolled threaded steel bars are connected to the continuous beam hanging basket through a second nut. The height and angle of the rigid bottom are adjusted by turning the second nut. S3, the lower end of the steel pipe support is inserted and fixed into the corresponding connecting hole of the connecting channel steel and welded and fixed. An inlet and outlet channel is reserved in the middle of one side of the steel pipe support. S4. Using the elevation of the rigid bottom as the baseline, multiple layers of protective netting are installed and welded in sequence. The blocks of adjacent layers of protective netting are connected and fixed with bolts, and the adjacent layers of protective netting are welded and fixed together. The protective netting and the steel pipe support are fixed together by welding angle iron.
[0020] The beneficial effects of this invention are: the continuous beam bottom protection system has a variety of beneficial effects in bridge overpass construction, including enhancing structural stability, improving construction safety, facilitating construction and dismantling, facilitating the conversion of the hanging basket system, accelerating the construction progress, and bringing significant economic benefits. These effects together ensure the smooth progress of the bridge construction process and the reliable guarantee of the final quality.
[0021] 1. Enhanced construction safety: The fully enclosed safety barrier fundamentally eliminates the risk of any falling object penetrating the structure, achieving "absolute containment." The protective netting combined with the three-dimensional steel pipe frame forms the optimal defense line, ensuring both ventilation and light transmission while preventing any falling objects from splashing out from any angle, thus guaranteeing the safety of both construction workers and vehicles traveling below the bridge.
[0022] 2. Enhanced structural stability: The spatial skeleton composed of reinforced steel pipes has high rigidity and is not easily deformed. The suspension system of double-channel steel + precision-rolled threaded steel provides ultra-high strength support, with good impact resistance and fatigue resistance, effectively suppressing the swaying of the system under wind load and vibration.
[0023] 3. Modular design and ease of construction: The protective system can be modularly manufactured and quickly assembled on site, which greatly improves installation efficiency and helps to improve construction efficiency and quality.
[0024] 4. Significant economic benefits: Although a fully enclosed underpass requires certain material and construction costs, its role in improving construction efficiency, reducing construction risks, and ensuring traffic safety under the bridge is undeniable. Therefore, in the long run, the installation of a fully enclosed underpass can bring significant economic and social benefits. Attached Figure Description
[0025] Figure 1 This is a side view of the fully enclosed bottom protection device for continuous beam hanging baskets according to the present invention; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of AA; Figure 3 for Figure 2 Enlarged structural diagram of section A in the middle; Figure 4 This is a partial structural schematic diagram of the fully enclosed bottom protection device for continuous beam hanging baskets according to the present invention.
[0026] The attached diagram lists the components represented by each number as follows: 1. Base plate; 11. Side plates; 12. Load-bearing longitudinal beams; 13. Load-bearing transverse beams; 14. Connecting channel steel; 2. Precision rolled threaded steel bar; 21. First nut; 22. Second nut; 3. Horizontal steel pipe; 31. Vertical steel pipe; 4. Protective net; 5. Continuous beam hanging basket. Detailed Implementation
[0027] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.
[0028] Example 1 like Figures 1-4 As shown, this embodiment of a fully enclosed bottom protection device for a continuous beam hanging basket includes a rigid bottom, precision-rolled threaded steel bars 2, steel pipe supports, and a protective net 4. The rigid bottom is a cubic closed structure with an open top. Multiple precision-rolled threaded steel bars 2 for connecting the continuous beam hanging basket 5 are vertically fixed to the bottom wall of the rigid bottom. A ring of steel pipe supports is fixed on the outer peripheral side wall of the rigid bottom. A through-passage is reserved in the middle of one side of the steel pipe supports. The protective net 4 is laid and fixed on the steel pipe supports.
[0029] like Figure 1 and Figure 2As shown, in a preferred embodiment, the precision-rolled threaded steel bars 2 are arranged in at least two rows along the entry / exit direction of the entry / exit channel, each row including multiple precision-rolled threaded steel bars 2 arranged at intervals perpendicular to the entry / exit direction of the entry / exit channel. A row of precision-rolled threaded steel bars is arranged on the front side of the bottom wall of the rigid support, and another row is arranged on the rear side of the bottom wall of the rigid support. The row of precision-rolled threaded steel bars located on the front side of the bottom wall of the rigid support is located on both sides of the entry / exit channel. Each row of precision-rolled threaded steel bars includes four precision-rolled threaded steel bars 2. By setting two rows of precision-rolled threaded steel bars, each row including four precision-rolled threaded steel bars, the connection between the rigid support and the continuous beam hanging basket is made more stable and reliable, ensuring uniform load transfer and avoiding excessive local stress.
[0030] Specifically, in this embodiment, the height of the steel pipe support is at least twice the height of the precision-rolled threaded steel bar 2.
[0031] The overall dimensions of a fully enclosed bottom protection device for a continuous beam hanging basket in this embodiment are 14.2m × 7.6m × 7.2m.
[0032] This embodiment of a fully enclosed bottom protection device for continuous beam hanging baskets is mainly used on construction bridges. It adopts a fully enclosed structure to prevent small tools from falling onto the highway below the bridge.
[0033] This embodiment presents a fully enclosed bottom protection device for continuous beam hanging baskets. It adopts a fully enclosed rigid bottom protection device, providing a robust, well-sealed, and highly safe fully enclosed bottom protection system for continuous beam hanging baskets, thereby improving construction quality and accelerating construction progress.
[0034] Example 2 Based on Example 1, this example provides a preferred structure with a rigid bottom, such as... Figures 1-4 As shown, the rigid support in this embodiment includes a base plate 1 and side plates 11. A ring of side plates 11 is vertically fixed around the periphery of the base plate 1. The lower end of the precision-rolled threaded steel bar 2 passes through the base plate 1 and is fixedly connected to the base plate 1 by a first nut 21. Specifically, in this embodiment, the base plate 1 is made of 3mm thick steel plate, and the side plates are also made of steel plate with a thickness similar to or thinner than the base plate. The height of the side plates is 1.2m.
[0035] like Figure 3 and Figure 4As shown, in a preferred embodiment, a load-bearing longitudinal beam 12 is fixed to the lower surface of the base plate 1, and a load-bearing crossbeam 13 is vertically fixed to the load-bearing longitudinal beam 12. The load-bearing crossbeam 13 extends along the direction perpendicular to the inlet / outlet of the passage. The lower end of the precision-rolled threaded steel bar 2 passes through the load-bearing crossbeam 13 and is fixedly connected to the load-bearing crossbeam 13 by a first nut 21. By setting the load-bearing crossbeam and the load-bearing longitudinal beam, the structural strength is better, the stability is better, and it can achieve a good load-bearing effect.
[0036] like Figure 4 As shown, in a preferred embodiment, the load-bearing crossbeam 13 is a double-slotted channel steel, and the lower end of the precision-rolled threaded steel bar 2 passes through the middle splice of the double-slotted channel steel. By setting the double-slotted channel steel, the stable connection of the precision-rolled threaded steel bar is facilitated, resulting in high structural strength and good stability.
[0037] like Figure 1 As shown, in a preferred embodiment, the load-bearing crossbeam 13 is provided with at least two crossbeams.
[0038] like Figure 1 As shown, in a preferred embodiment, multiple load-bearing longitudinal beams 12 are provided, and the multiple load-bearing longitudinal beams 12 are arranged at intervals in sequence. The load-bearing longitudinal beams 12 are channel steel structures, and the opposite side walls of the load-bearing longitudinal beams 12 are fixedly connected to the bottom plate 1 and the load-bearing crossbeams 13, respectively.
[0039] Example 3 Based on Embodiment 1 or Embodiment 2, this embodiment provides a preferred structure with a rigid bottom, such as... Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the bottom periphery of the rigid support is provided with a ring of upward-facing connecting channel steel 14; the steel pipe support includes a horizontal steel pipe 3 and a vertical steel pipe 31, the lower end of the vertical steel pipe 31 is vertically fixed in the corresponding connecting channel steel 14, and the horizontal steel pipe 3 is vertically fixed on the vertical steel pipe 31. By setting the connecting channel steel, the connection and fixation of the steel pipe support are facilitated.
[0040] Specifically, in this embodiment, a connecting hole is provided at a preset interval on the connecting channel steel 14, and the lower end of the vertical steel pipe 31 passes through the connecting hole and is welded and fixed to the connecting channel steel 14.
[0041] Specifically, the spacing between the vertical steel pipes 31 and the spacing between the horizontal steel pipes 3 are both 1.5m.
[0042] Example 4 This embodiment provides a construction method for a fully enclosed bottom protection device for a continuous beam hanging basket 5 as described in any of the above embodiments, including the following steps: S1. Level the site at the assembly location, weld multiple metal plates according to the overall structural dimensions of the rigid bottom to form the rigid bottom, fix multiple precision rolled threaded steel bars 2 on the bottom wall of the rigid bottom; weld and fix a ring of connecting channel steel 14 around the bottom perimeter of the rigid bottom, and make the opening of the connecting channel steel 14 face upward, and open a connecting hole at a preset distance on the connecting channel steel 14. S2, the precision-rolled threaded steel bar 2 is suspended by a suspension mechanism, so that the rigid bottom is lifted, and multiple precision-rolled threaded steel bars 2 are used to fix the rigid bottom to the continuous beam hanging basket 5 (specifically, it can be fixed to the support beam of the continuous beam hanging basket 5). The multiple precision-rolled threaded steel bars 2 are connected to the continuous beam hanging basket 5 through the second nut 22, and the height and angle of the rigid bottom are adjusted by turning the second nut 22. The suspension mechanism adopts a commonly used mechanism in construction, such as an electric hoist.
[0043] S3, the lower end of the steel pipe support is inserted and fixed in the corresponding connecting hole of the connecting channel steel 14 and welded. An access channel is reserved in the middle of one side of the steel pipe support. The vertical steel pipe and the horizontal steel pipe are both unwelded continuous structures. The length of the horizontal steel pipe is 6m. They are assembled and welded according to the transverse length and the step distance of 1.5m. The welding points must not be on the same section surface and must be staggered by 2m.
[0044] S4, using the rigid bottom elevation as a baseline, install and weld multiple layers of protective netting 4 sequentially. Adjacent layers of protective netting 4 are connected and fixed with bolts, and adjacent layers are welded together. The protective netting 4 is welded to the steel pipe support and fixed as a single unit using angle iron. Each layer of protective netting 4 measures 1.2m × 2m, and each heightened section of protective netting 4 can be connected and fixed with bolts.
[0045] This embodiment presents a fully enclosed bottom protection device for continuous beam hanging baskets, characterized by high strength, good ventilation, and excellent overall stability, capable of ensuring the safety of the entire continuous beam during highway cantilever construction. Each steel plate of the rigid bottom is precisely positioned and securely welded, guaranteeing no water or grout leakage during continuous beam construction. The steel pipe frame installation must strictly adhere to the spacing and layout specified in the construction design drawings to prevent localized instability during later cantilever construction. The raised protective net has numerous bolt connection points and welding points; therefore, strict control of welding and bolt connection quality is crucial to prevent localized weld failure and instability, ensuring the safety of construction personnel and vehicles during continuous beam construction. The overall rigid bottom suspension system is paramount; during construction, strict adherence to the specifications is essential. The hanging rods (precision-rolled threaded steel) must be installed vertically without tilting, all welds must be secure, and nuts must be tightened. After construction, the entire structure must be inspected and accepted before use. Daily checks are required for weld failure and loose bolts and nuts to ensure structural stability.
[0046] This embodiment describes a fully enclosed bottom protection device for continuous beam hanging baskets. Construction involves material selection and control, construction precision, and quality control. During construction, strict adherence to design drawings and specifications is crucial to ensure structural stability and safety. The spacing, height, and welding quality of the steel pipe frame must be strictly controlled to ensure consistency with the design drawings. The suspension system must be securely installed and reliably connected to prevent instability. Continuous inspection of the fully enclosed bottom protection device is necessary during construction, including parameters such as weld points, bolts, and nuts.
[0047] This embodiment of a fully enclosed bottom protection device for continuous beam formwork has a variety of beneficial effects in bridge overpass construction, including enhancing structural stability, improving construction safety, facilitating construction dismantling, facilitating the conversion of the formwork system, accelerating construction progress, and bringing significant economic benefits. These effects together ensure the smooth progress of bridge construction and the reliable guarantee of final quality.
[0048] In the description of this invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do 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. Therefore, they should not be construed as limitations on this invention.
[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A fully enclosed bottom protection device for continuous beam hanging baskets, characterized in that, It includes a rigid bottom support, precision-rolled threaded steel bars, steel pipe supports, and a protective net. The rigid bottom support is a cubic closed structure with an open top. The bottom wall of the rigid bottom support has multiple precision-rolled threaded steel bars vertically fixed for connecting the continuous beam hanging basket. A ring of steel pipe supports is fixed on the outer peripheral side wall of the rigid bottom support. A through passage is reserved in the middle of one side of the steel pipe supports. A protective net is laid and fixed on the steel pipe supports.
2. The fully enclosed bottom protection device for continuous beam hanging baskets according to claim 1, characterized in that, The rigid bottom includes a base plate and side plates. A ring of the side plates is vertically fixed around the perimeter of the base plate. The lower end of the precision-rolled threaded steel bar passes through the base plate and is fixedly connected to the base plate by a first nut.
3. The fully enclosed bottom protection device for continuous beam hanging baskets according to claim 2, characterized in that, A load-bearing longitudinal beam is fixed to the lower surface of the base plate, and a load-bearing crossbeam is vertically fixed on the load-bearing longitudinal beam. The load-bearing crossbeam extends along the direction of entry and exit perpendicular to the entry and exit channel. The lower end of the precision rolled threaded steel bar passes through the load-bearing crossbeam and is fixedly connected to the load-bearing crossbeam by a first nut.
4. The fully enclosed bottom protection device for continuous beam hanging baskets according to claim 3, characterized in that, The load-bearing crossbeam is a double-channel steel, and the lower end of the precision-rolled threaded steel passes through the middle splice of the double-channel steel.
5. The fully enclosed bottom protection device for continuous beam hanging baskets according to claim 3, characterized in that, The load-bearing crossbeams are provided in at least two.
6. The fully enclosed bottom protection device for continuous beam hanging baskets according to claim 1, characterized in that, The fine-rolled threaded steel bars are arranged in at least two rows along the inlet and outlet direction of the inlet and outlet channel, and each row includes multiple fine-rolled threaded steel bars arranged at intervals along the inlet and outlet direction perpendicular to the inlet and outlet channel.
7. The fully enclosed bottom protection device for continuous beam hanging baskets according to claim 1, characterized in that, The height of the steel pipe support is at least twice the height of the precision-rolled threaded steel bar.
8. The fully enclosed bottom protection device for continuous beam hanging baskets according to claim 1, characterized in that, The bottom periphery of the rigid support is provided with a ring of connecting channel steel with the opening facing upward; the steel pipe support includes a horizontal steel pipe and a vertical steel pipe, the lower end of the vertical steel pipe is vertically fixed in the corresponding connecting channel steel, and the horizontal steel pipe is vertically fixed on the vertical steel pipe.
9. A fully enclosed bottom protection device for continuous beam hanging baskets according to claim 8, characterized in that, A connecting hole is provided at preset intervals on the connecting channel steel, and the lower end of the vertical steel pipe passes through the connecting hole and is welded and fixed to the connecting channel steel.
10. A construction method for a fully enclosed bottom protection device for a continuous beam hanging basket as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Level the site at the assembly location, weld multiple metal plates according to the overall structural dimensions of the rigid bottom to form the rigid bottom, fix multiple precision-rolled threaded steel bars on the bottom wall of the rigid bottom; weld and fix a ring of connecting channel steel around the bottom perimeter of the rigid bottom, with the opening of the connecting channel steel facing upward, and open a connecting hole at a preset distance on the connecting channel steel. S2, the fine-rolled threaded steel is suspended by a suspension mechanism to lift the rigid bottom, and multiple fine-rolled threaded steel bars are used to fix the rigid bottom to the continuous beam hanging basket. The multiple fine-rolled threaded steel bars are connected to the continuous beam hanging basket through a second nut. The height and angle of the rigid bottom are adjusted by turning the second nut. S3, the lower end of the steel pipe support is inserted and fixed into the corresponding connecting hole of the connecting channel steel and welded and fixed. An inlet and outlet channel is reserved in the middle of one side of the steel pipe support. S4. Using the elevation of the rigid bottom as the baseline, multiple layers of protective netting are installed and welded in sequence. The blocks of adjacent layers of protective netting are connected and fixed with bolts, and the adjacent layers of protective netting are welded and fixed together. The protective netting and the steel pipe support are fixed together by welding angle iron.