Device and method for forming drainage pipe containing steel wire

Abstract

The invention provides a forming device and method for a drainage pipe containing a steel wire, relates to the technical field of drainage pipe manufacturing, and aims to overcome the defects of a traditional drainage pipe in the aspects of structural strength and pressure resistance. By optimizing a combination technology and a production process, optimized combination of a steel wire spring structure and the drainage pipe is achieved, and the structural strength and performance of the drainage pipe are remarkably improved. The method comprises a preparation step, an assembly step, an alignment and stretching step, a heating and embedding step and a subsequent treatment step, and firm combination of the steel wire and the inner wall of the drainage pipe is achieved through accurate control and operation. Compared with the prior art, the production process is simplified, the production efficiency is improved, the production cost is reduced, and a more efficient and reliable solution is provided for the field of drain pipe manufacturing. The drainage pipe containing the steel wires has a wide application prospect, especially in occasions needing to bear high pressure or special environmental conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of drain pipe manufacturing, and specifically to a forming device and method for a drain pipe containing steel wires. Background Art

[0002] Traditional drain pipes often have obvious deficiencies in terms of structural strength and compressive capacity due to the limitations of their material properties and structural designs. Especially in some occasions that need to withstand high pressures or special environmental conditions, such as deep underground drainage systems, high-pressure water flow conveying pipelines, etc., the performance of traditional drain pipes often fails to meet the actual requirements.

[0003] In order to improve the performance of drain pipes, various methods have been tried in the prior art. Among them, embedding reinforcing materials in the inner wall of drain pipes is an effective means. By embedding metal materials such as steel wires in the inner wall of drain pipes, the compressive capacity and structural strength of the drain pipes can be significantly improved, enabling them to better adapt to various complex environments and usage conditions.

[0004] However, there are still some problems with the existing drain pipe reinforcement technologies. On the one hand, due to the small inner diameter of the drain pipes, accurately embedding reinforcing materials such as steel wires into the inner wall of the drain pipes is a technical problem. The existing assembly methods often have problems such as complex operations and low efficiency, and it is difficult to meet the requirements of large-scale production. On the other hand, due to the property differences between the steel wires and the drain pipe materials, how to achieve a firm bond between the steel wires and the inner wall of the drain pipe is also an urgent problem to be solved. If the bond is not firm, it will not only affect the performance of the drain pipe, but may also cause problems such as detachment and damage during use, threatening the normal operation of the drainage system. Summary of the Invention

[0005] The present invention aims to provide a forming device and method for a drain pipe containing steel wires. By optimizing the combination of technologies and production processes, the optimized combination of the steel wire spring structure and the drain pipe is achieved, improving the structural strength and performance of the drain pipe. At the same time, the production process is simplified, the production efficiency is improved, and the production cost is reduced, providing a more efficient and reliable solution for the drain pipe manufacturing field.

[0006] The above technical object of the present invention is achieved through the following technical solutions: A forming device for a drain pipe containing steel wires, used to manufacture a drain pipe with a spiral steel wire fixed on its inner wall, includes: An extruder, used to manufacture the drain pipe by the extrusion molding method; A spring coiling machine, used to process the steel wire into a spring structure, and the outer diameter of the spring structure is greater than the inner diameter of the drain pipe when not under external force; Electric telescopic rod, which includes a fixed rod and a movable rod telescopically arranged on the fixed rod. The outer diameter of the movable rod is smaller than the inner diameter of the drain pipe, and it can freely extend into the drain pipe. The movable rod has a heating function. A spring structure is sleeved on the movable rod, and one end of the spring structure is fixed on the fixed rod, and the other end is fixed on the movable rod. The spring structure expands and contracts with the expansion and contraction of the movable rod; Assembly pipe, used to place the drain pipe to be assembled with the steel wire. The inner diameter of the assembly pipe is the same as the outer diameter of the drain pipe.

[0007] A method for forming a drain pipe containing steel wire, which is based on the above-mentioned device for forming a drain pipe containing steel wire, and includes the following steps: a. Preparation step: First, use an extruder to produce a drain pipe by extrusion molding and ensure that it has cooled and solidified. At the same time, use a spring coiling machine to process the steel wire into a spring structure. When the spring structure is not subject to external force, its outer diameter is designed to be larger than the inner diameter of the drain pipe; b. Assembly step: Sleeve the processed spring structure on the movable rod of the electric telescopic rod, and ensure that one end of the spring structure is fixed on the fixed rod and the other end is fixed on the movable rod; c. Alignment and stretching step: Place the cooled drain pipe into the assembly pipe, and ensure that the movable rod, the spring structure, the assembly pipe, and the drain pipe are coaxial. Then, start the electric telescopic rod to make the movable rod penetrate the entire drain pipe; d. Heating and embedding step: When the spring structure is gradually stretched and fits the outer wall of the movable rod, start the heating function of the movable rod and maintain it for a period of time to ensure sufficient heating of the spring structure. When the steel wire is heated to the melting point temperature of the drain pipe, stop heating and control the retraction of the movable rod until the outer diameter of the spring structure returns to fit the inner wall of the drain pipe. Since the temperature of the spring structure has reached the melting point temperature of the drain pipe at this time, the steel wire will be embedded into the inner wall of the drain pipe; e. Post-treatment step: Finally, after the steel wire and the drain pipe are cooled to room temperature, disconnect the two ends of the spring structure from the electric telescopic rod and cut off the excess steel wire to obtain a drain pipe with a spiral steel wire fixed on the inner wall.

[0008] In some embodiments, after completing step d, cold air is introduced into the assembly pipe.

[0009] In some embodiments, in the preparation step a, the freshly extruded drain pipe is subjected to preliminary cooling treatment, specifically by setting a cooling device at the outlet of the extruder.

[0010] In some embodiments, in the alignment and stretching step c, a laser alignment system is used to ensure that the movable rod, the spring structure, the assembly tube and the drain pipe remain coaxial. The laser alignment system includes a laser transmitter and a laser receiver, which are respectively arranged at both ends of the assembly tube.

[0011] In some embodiments, in the subsequent processing step e, when the operation of cutting excess steel wire is performed, a layer of fireproof covering is laid on the outer surface of the drain pipe.

[0012] In some embodiments, after the drain pipe and the steel wire are assembled, a layer of lining is disposed inside the drain pipe so that the steel wire is sandwiched between the lining and the drain pipe.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention significantly enhances the structural strength and pressure resistance of the drain pipe by processing the steel wire into a spring structure and embedding it into the inner wall of the drain pipe. This composite structure makes the drain pipe more stable when subjected to high pressure or external force, and prolongs its service life. The presence of the steel wire spring structure also helps to improve the water flow performance of the drain pipe, reduce the possibility of blockage, and improve the drainage efficiency. In addition, the method of the present invention accurately delivers the spring structure into the drain pipe through the movable rod of the electric telescopic rod, and ensures that the spring structure fits tightly with the inner wall of the drain pipe. This combination method realizes the precise positioning between the steel wire and the drain pipe, avoiding the errors and instability that may be caused by traditional manual assembly. During the stretching and heating process, the coils of the spring structure will gather toward the axis and adapt to the deformation caused by the stretching, so that the spring can gradually fit the outer wall of the movable rod and finally embed into the inner wall of the drain pipe. This adaptive gathering effect ensures the smooth progress of the combination process and the quality of the final product. In addition, the method of the present invention simplifies the complex steps in the traditional drain pipe reinforcement process and improves production efficiency. Through the automated electric telescopic rod and heating control system, precise control and rapid assembly of the spring structure are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the overall structural diagram of the molding device of the present invention; Figure 2 is an operation schematic diagram of the forming method of the present invention (when the drain pipe and the steel wire are not combined at all); Figure 3 is a schematic diagram of the operation of the forming method of the present invention (when the steel wire is stretched and heated); Figure 4 is an operation schematic diagram of the forming method of the present invention (when the heated steel wire is loosened until it contacts the inner wall of the drain pipe); Figure 5 It is a schematic diagram of the operation of the forming method of the present invention (when the drainage pipe and the steel wire are assembled).

[0015] In the figure: 100, drain pipe; 1, extrusion machine; 2, electric telescopic rod; 3, steel wire; 4, assembled pipe. Specific embodiments

[0016] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where 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 intended to explain the present invention, and should not be construed as limiting the present invention.

[0017] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0018] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0019] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] Please refer to Figure 1 , this embodiment provides a drain pipe forming device containing steel wire for manufacturing a drain pipe 100 with a spiral steel wire 3 fixed on the inner wall, including: An extrusion machine 1 for manufacturing the drain pipe 100 by an extrusion molding method; A spring coiling machine for processing the steel wire 3 into a spring structure, and the outer diameter of the spring structure is larger than the inner diameter of the drain pipe 100 when not subjected to external force; The electric telescopic rod 2 includes a fixed rod and a movable rod telescopically arranged on the fixed rod. The outer diameter of the movable rod is smaller than the inner diameter of the drain pipe 100, and it can freely extend into the drain pipe 100. The movable rod has a heating function. A spring structure is sleeved on the movable rod, and one end of the spring structure is fixed on the fixed rod, and the other end is fixed on the movable rod. The spring structure expands and contracts with the expansion and contraction of the movable rod; The assembling pipe 4 is used to place the drain pipe 100 to be assembled with the steel wire 3. The inner diameter of the assembling pipe 4 is the same as the outer diameter of the drain pipe 100.

[0021] Please refer to Figures 1 - 5 , this embodiment also provides a method for forming a drain pipe containing steel wire. This method is based on the above-mentioned device for forming a drain pipe containing steel wire, and it includes the following steps: a. Preparation step: First, use the extrusion machine 1 to produce the drain pipe 100 by extrusion molding and ensure that it has cooled and solidified; at the same time, use the spring coiling machine to process the steel wire 3 into a spring structure. When the spring structure is not under external force, its outer diameter is designed to be larger than the inner diameter of the drain pipe 100.

[0022] b. Assembly step: Sleeve the processed spring structure on the movable rod of the electric telescopic rod 2, and ensure that one end of the spring structure is fixed on the fixed rod and the other end is fixed on the movable rod. After such setting, the spring structure can perform corresponding expansion and contraction actions with the expansion and contraction of the movable rod.

[0023] c. Alignment and stretching step: Place the cooled drain pipe 100 into the assembling pipe 4, and ensure that the movable rod, the spring structure, the assembling pipe 4, and the drain pipe 100 are coaxial. Then, start the electric telescopic rod 2 to make the movable rod penetrate the entire drain pipe 100. During this process, the spring structure made of the steel wire 3 will also be stretched accordingly. According to the physical properties of the spring, during the stretching process, the coils of the spring will gather towards the axis, thereby reducing the overall cross-sectional area to adapt to the deformation caused by stretching.

[0024] d. Heating and embedding step: When the spring structure is gradually stretched and fits the outer wall of the movable rod, start the heating function of the movable rod and continue for a period of time to ensure sufficient heating of the spring structure. When the steel wire 3 is heated to the melting point temperature of the drain pipe 100, stop heating and control the retraction of the movable rod. In this way, the spring structure will restore its outer diameter and fit the inner wall of the drain pipe 100. Since the temperature of the spring structure has reached the melting point temperature of the drain pipe 100 at this time, the steel wire 3 will be embedded into the inner wall of the drain pipe 100.

[0025] e. Subsequent processing steps: Finally, disconnect the two ends of the spring structure from the electric telescopic rod 2, and cut off the excess steel wire 3. After these steps, a drain pipe 100 with a spiral steel wire 3 fixed on its inner wall can be obtained.

[0026] Through the above technical solution, when the steel wire 3 is installed in the drain pipe 100, first, the steel wire 3 is processed into a spring structure by a spring coiling machine, then the spring structure is sleeved on the movable rod of the electric telescopic rod 2, and one end of the spring structure is fixed on the fixed rod and the other end is fixed on the movable rod. In this way, the spring structure can expand and contract with the expansion and contraction of the movable rod. Then, the drain pipe 100 that has been extruded and cooled by the extruder 1 is inserted into the assembly pipe 4. Next, align the movable rod with the assembly pipe 4 and the drain pipe 100 to ensure that the movable rod, the spring structure, the assembly pipe 4 and the drain pipe 100 are coaxial. Then start the electric telescopic rod 2 to make the movable rod penetrate the entire drain pipe 100. During this period, the spring structure made of the steel wire 3 is also stretched. According to the physical properties of the spring, during the stretching process, the coils of the spring will gather towards the axis to reduce the overall cross-sectional area, so as to adapt to the deformation caused by the stretching. And this gathering effect causes the radius of the spring to become smaller during stretching. Therefore, as the spring structure is gradually stretched, it will gradually fit the outer wall of the movable rod. At this time, start heating the movable rod and keep it for a period of time to heat the spring structure. When the steel wire 3 is heated to the melting point temperature of the drain pipe 100, stop heating the movable rod and control the movable rod to retract until the spring structure resumes its outer diameter and fits the inner wall of the drain pipe 100. At this time, since the temperature of the spring structure has reached the melting point temperature of the drain pipe 100, the steel wire 3 at this time will be embedded in the inner wall of the drain pipe 100. At the same time, cold air can be introduced into the assembly pipe 4 to quickly cool the steel wire 3 and the inner wall of the drain pipe 100, so as to fix the shape of the steel wire 3 and the drain pipe 100. Finally, disconnect the two ends of the spring structure from the electric telescopic rod 2, and cut off the excess steel wire 3, thus obtaining a drain pipe 100 with a spiral steel wire 3 fixed on its inner wall.

[0027] By adopting the method for forming a drain pipe containing steel wire of the present invention, a precise and efficient combination of a spring structure made of steel wire 3 and a drain pipe 100 is achieved. Specifically, by processing the steel wire 3 into a spring structure and embedding it into the inner wall of the drain pipe 100, the structural strength and compressive resistance of the drain pipe 100 are significantly enhanced. This composite structure makes the drain pipe 100 more stable when subjected to high pressure or external force, and prolongs its service life. The presence of the spring structure made of steel wire 3 also helps to improve the water flow performance of the drain pipe 100, reduce the possibility of blockage, and improve the drainage efficiency. In addition, the method of the present invention accurately delivers the spring structure into the drain pipe 100 through the movable rod of the electric telescopic rod 2, and ensures that the spring structure is closely fitted to the inner wall of the drain pipe 100. This combination method realizes precise positioning between the steel wire 3 and the drain pipe 100, avoiding the errors and instability that may be caused by traditional manual assembly. During the stretching and heating process, the coils of the spring structure will gather toward the axis and adapt to the deformation caused by the stretching, so that the spring can gradually fit the outer wall of the movable rod and finally be embedded in the inner wall of the drain pipe 100. This adaptive gathering effect ensures the smooth progress of the assembly process and the quality of the final product. In addition, the method of the present invention simplifies the complex steps in the traditional drainage pipe 100 reinforcement process and improves production efficiency. Through the automated electric telescopic rod 2 and heating control system, precise control and rapid assembly of the spring structure are achieved. The method is also suitable for large-scale industrial production, can meet the production requirements of drainage pipes 100 of different specifications and needs, reduce production costs and improve market competitiveness.

[0028] In summary, the method for forming a drain pipe containing steel wires of the present invention realizes an optimized combination of a spring structure made of steel wire 3 and the drain pipe 100 through precise combination technology and efficient production process. This technical effect not only improves the structural strength and performance of the drain pipe 100, but also brings more convenience and economic benefits to the production and application of the drain pipe 100.

[0029] In some embodiments, after completing step d, cold air is introduced into the assembly tube 4 to quickly reduce the temperature of the steel wire 3 and the inner wall of the drain pipe 100. By introducing cold air into the assembly tube 4, the heat of the steel wire 3 and the inner wall of the drain pipe 100 can be quickly taken away, thereby achieving rapid cooling. This rapid cooling process helps the fused portion between the steel wire 3 and the inner wall of the drain pipe 100 to solidify rapidly, ensuring that the steel wire 3 is firmly embedded in the inner wall of the drain pipe 100. In addition, the rapid shaping and curing process also helps to reduce the thermal stress caused by long-term high temperature, thereby avoiding deformation or cracking of the drain pipe 100 during subsequent use.

[0030] In some embodiments, in the preliminary step a, a preliminary cooling treatment is performed on the just-extruded drain pipe 100. Specifically, a cooling device, such as a cooling fan or a water mist spraying system, is provided at the outlet of the extruder 1 to ensure that the drain pipe 100 is in a preliminary cooling state when it leaves the extruder 1, facilitating the subsequent assembly and heating embedding processes. By performing a preliminary cooling treatment on the just-extruded drain pipe 100, the time required for the drain pipe 100 to naturally cool to a solidified state can be significantly shortened. In this way, the drain pipe 100 can enter the subsequent assembly and heating embedding steps faster, thereby improving the overall production efficiency.

[0031] In some embodiments, in the alignment and stretching step c, a laser alignment system is used to ensure that the movable rod, the spring structure, the assembly pipe 4, and the drain pipe 100 are coaxial. The laser alignment system includes a laser emitter and a laser receiver, which are respectively arranged at both ends of the assembly pipe 4. Before placing the drain pipe 100 into the assembly pipe 4, the laser alignment system is first started. The laser emitter emits a beam of laser, which passes through the inside of the assembly pipe 4 and is received by the laser receiver. At this time, the position of the movable rod is adjusted until it completely blocks the laser path, indicating that the movable rod, the spring structure, the assembly pipe 4, and the drain pipe 100 are in a coaxial state. Subsequently, the stretching and heating embedding steps are carried out. Due to the precise guidance of the laser alignment system, the coaxial state is ensured throughout the process. The use of the laser alignment system simplifies the operation in the alignment step. Workers only need to start the laser alignment system and then adjust the position of the movable rod until it blocks the laser path. This reduces the requirements for workers' skills, while reducing human errors and improving production efficiency.

[0032] In some embodiments, in the subsequent treatment step e, when performing the operation of cutting the excess wire 3, a fireproof covering is laid on the outer surface of the drain pipe 100. Sparks generated during the cutting process may cause damage or affect the product quality if they splash onto the drain pipe 100 or other equipment. The use of the fireproof covering provides an additional protective layer for the drain pipe 100 and the product, ensuring the quality of the product and the smooth progress of production, so as to prevent the sparks generated during the cutting process from splashing onto the drain pipe 100 or other flammable items, thereby preventing damage or safety hazards.

[0033] In some embodiments, after the drain pipe 100 and the steel wire 3 are assembled, a layer of lining is provided inside the drain pipe 100, so that the steel wire 3 is clamped between the lining and the drain pipe 100, to enhance the bonding force between the steel wire 3 and the inner wall of the drain pipe 100, and further improve the structural strength and compressive capacity of the drain pipe 100. Specifically, by adding a layer of lining inside the drain pipe 100 and clamping the steel wire 3 between the lining and the drain pipe 100, the bonding force between the steel wire 3 and the inner wall of the drain pipe 100 is effectively enhanced. This sandwich structure makes the steel wire 3 more firmly embedded in the drain pipe 100 and not easily fall off or move. Moreover, the addition of the lining provides additional support and protection for the drain pipe 100, making the overall structure more robust. When under high pressure or external force, the drain pipe 100 can better maintain its shape and stability, thus extending its service life. In addition, the lining usually has a smooth surface, which helps to reduce the resistance of water flow inside the drain pipe 100 and improve the drainage efficiency. At the same time, the smooth inner wall also reduces the adhesion of dirt and impurities and lowers the risk of blockage.

[0034] This specific embodiment is only an interpretation of the present invention and not a limitation thereof. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A drainage pipe forming device containing steel wires, used for manufacturing a drainage pipe (100) having a spiral steel wire (3) fixed on the inner wall, characterized in that: include: An extruder (1) for manufacturing a drainage pipe (100) by an extrusion molding method; A spring coiling machine, used for processing the steel wire (3) into a spring structure, wherein the outer diameter of the spring structure is larger than the inner diameter of the drain pipe (100) when no external force is applied; An electric telescopic rod (2), comprising a fixed rod and a movable rod telescopically arranged on the fixed rod, the outer diameter of the movable rod being smaller than the inner diameter of the drain pipe (100), and the movable rod being able to freely extend into the drain pipe (100), the movable rod having a heating function, a spring structure being sleeved on the movable rod, one end of the spring structure being fixed on the fixed rod, and the other end being fixed on the movable rod, the spring structure being telescopically arranged as the movable rod is telescopically extended; The assembly pipe (4) is used to place the drainage pipe (100) to be assembled with the steel wire (3), and the inner diameter of the assembly pipe (4) is consistent with the outer diameter of the drainage pipe (100).

2. A method for forming a drainage pipe containing steel wires, the method being based on the device for forming a drainage pipe containing steel wires as claimed in claim 1, characterized in that: The following steps are involved: a. Preparatory step: First, use an extruder (1) to produce a drain pipe (100) by extrusion molding, and ensure that it has been cooled and solidified. At the same time, use a spring coiling machine to process the steel wire (3) into a spring structure. When the spring structure is not subjected to external force, its outer diameter is designed to be larger than the inner diameter of the drain pipe (100); b. Assembly steps: Sleeve the processed spring structure on the movable rod of the electric telescopic rod (2), and ensure that one end of the spring structure is fixed on the fixed rod and the other end is fixed on the movable rod; c. Alignment and stretching step: Place the cooled drain pipe (100) into the assembly pipe (4), and ensure that the movable rod, the spring structure, the assembly pipe (4) and the drain pipe (100) are coaxial, and then start the electric telescopic rod (2) to allow the movable rod to penetrate the entire drain pipe (100); d. Heating and embedding step: when the spring structure is gradually stretched and fits the outer wall of the movable rod, the heating function of the movable rod is started and continued for a period of time to ensure that the spring structure is fully heated. When the steel wire (3) is heated to the melting point of the drain pipe (100), the heating is stopped and the movable rod is controlled to retract until the outer diameter of the spring structure is restored to fit the inner wall of the drain pipe (100). Since the temperature of the spring structure has reached the melting point of the drain pipe (100) at this time, the steel wire (3) will be embedded in the inner wall of the drain pipe (100); e. Subsequent processing steps: Finally, after the steel wire (3) and the drain pipe (100) are cooled to room temperature, the two ends of the spring structure are disconnected from the electric telescopic rod (2), and the excess steel wire (3) is cut off to obtain a drain pipe (100) with a spiral steel wire (3) fixed to the inner wall.

3. A method for forming a drainage pipe containing steel wire according to claim 2, characterized in that: After completing step d, cool air is introduced into the assembly tube (4).

4. A method for forming a drainage pipe containing steel wire according to claim 2, characterized in that: In the preliminary step a, the drainage pipe (100) just extruded is subjected to a preliminary cooling treatment, specifically by providing a cooling device at the outlet of the extruder (1).

5. A method for forming a drainage pipe containing steel wire according to claim 2, characterized in that: In the alignment and stretching step c, a laser alignment system is used to ensure that the movable rod, the spring structure, the assembly tube (4) and the drainage tube (100) remain coaxial. The laser alignment system comprises a laser transmitter and a laser receiver, which are respectively arranged at two ends of the assembly tube (4).

6. A method for forming a drainage pipe containing steel wire according to claim 2, characterized in that: In the subsequent processing step e, when the operation of cutting the excess steel wire (3) is performed, a layer of fireproof covering is laid on the outer surface of the drainage pipe (100).

7. A method for forming a drainage pipe containing steel wire according to claim 2, characterized in that: After the drainage pipe (100) and the steel wire (3) are assembled, a layer of lining is provided inside the drainage pipe (100) so that the steel wire (3) is sandwiched between the lining and the drainage pipe (100).

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