A prefabricated cable duct and its processing method

Abstract

This invention discloses a prefabricated cable conduit and its processing method, including a prefabricated conduit, a conduit mold, and a core tube fixture. The invention utilizes a conduit mold located on the outside of the prefabricated conduit, with at least two sets of core tube fixtures connected to the inner end of the mold. These fixtures work together to cast the prefabricated conduit, effectively improving production control and quality. The conduit mold includes components such as a base plate, front and rear templates, side templates, through holes, and reinforcing ribs, which define the shape of the prefabricated conduit, ensuring consistency in the produced conduits. The core tube fixture includes components such as a central shaft, an expansion mechanism, and an outer plate, which work together to ensure smooth core extraction, preventing damage to the inner side of the forming hole. This meets the design strength and service life requirements of the prefabricated conduit, satisfying user needs.

Description

Technical Field

[0001] This invention relates to the field of cable installation technology, specifically to a prefabricated cable conduit and its processing method. Background Technology

[0002] Precast cable ducts are modular cable protection pipe systems prefabricated in a factory. They are cast from concrete or composite materials and have embedded metal or plastic core tubes arranged according to design requirements to form a regular cable channel. Their core feature is that they are mass-produced through standardized molds and can be directly assembled on site, avoiding the on-site formwork and curing processes of traditional cast-in-place ducts. Typical structures include a shell with reinforcing ribs, precisely positioned forming holes, and quick-connect slots. They have advantages such as adjustable hole diameter, strong compressive strength, and quick construction. They are mainly used in infrastructure scenarios such as urban integrated pipe corridors and power tunnels that require high-precision and high-efficiency cable laying.

[0003] In the production and processing of some existing prefabricated cable ducts, processes such as airbag forming holes and airbag-lined forming holes are used. In the airbag forming hole process, the airbag floats up during concrete pouring, which causes the formed hole diameter to bend and shift. In the airbag-lined forming hole process, wrinkles may appear in the airbag patch area, leaving marks on the pipe wall. In addition, the bonding force with the concrete surface is large, making demolding difficult. These processes have shortcomings such as difficulty in pre-construction observation and difficulty in subsequent demolding, which make it difficult to meet the needs of customers. Summary of the Invention

[0004] The purpose of this invention is to provide a prefabricated cable duct and its processing method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a prefabricated cable conduit, comprising a prefabricated conduit, wherein a conduit mold is connected to the outside of the prefabricated conduit, and the conduit mold is provided with at least two sets of core tube tooling in an array at its inner end.

[0006] The prefabricated pipe has at least two sets of forming holes on its outer side in a dot matrix pattern, and at least two sets of connecting slots are provided on both sides of the prefabricated pipe near the front end.

[0007] By adopting the above technical solutions, the corresponding design of the dot-matrix distributed core tube tooling and the forming hole can achieve standardized prefabrication, shorten the casting period, and form a modular channel with multiple sets of core tube tooling and forming holes, which is convenient for adding or removing cables later. The design of the connecting slot supports the rapid docking between prefabricated pipes, which is convenient for system expansion or partial replacement.

[0008] Preferably, the pipe mold includes a base plate, front and rear templates, side templates, through holes and reinforcing ribs. The front and rear ends of the top surface of the base plate are connected to a set of front and rear templates. The left and right ends of the top surface of the base plate are provided with a set of side templates. The surfaces of the front and rear templates are provided with no less than two sets of through holes. The outer sides of the front and rear templates and the side templates are provided with reinforcing ribs.

[0009] By adopting the above technical solutions, the base plate, front and rear templates and side templates can form a standardized mold frame, which is convenient for quick assembly and disassembly, realizes modular assembly, improves production efficiency, and the reinforcing ribs are distributed on the outside of the front and rear templates and side templates, which can improve the overall rigidity, prevent deformation during concrete pouring, and ensure the dimensional accuracy of the precast pipes.

[0010] Preferably, the core tube tooling includes a central shaft, an expansion mechanism, and an outer plate. The three outer plates are connected to the front and rear positions of the central shaft through the expansion mechanism.

[0011] By adopting the above technical solution, the expansion mechanism can drive the radial extension and retraction of three sets of outer plates, flexibly adjust the forming diameter of the core tube tooling, meet the prefabrication requirements of different specifications of pipes, reduce production line adjustment time, improve efficiency, and the three sets of outer plates are symmetrically distributed, forming a stable support after expansion, avoiding uneven force during casting that could cause hole deformation, and ensuring the roundness and surface flatness of the inner wall of the pipe hole.

[0012] Preferably, a set of fixing blocks is provided at the front end of the central shaft, and a set of rotating parts are connected to the outer side of the central shaft near the front end.

[0013] By adopting the above technical solution, the fixing block, as the reference structure at the front end of the central shaft, can cooperate with the external fixing device to achieve quick centering and locking of the core tube fixture, avoiding displacement during the pouring process. The rotating part can rotate freely at the front end of the central shaft, which can control the opening and closing of the outer expansion mechanism. The expansion state of the outer plate can be adjusted without disassembling the mold, which facilitates loosening the contact between the outer plate and the concrete during the demolding stage, reducing adhesion, and making it easy to remove the core tube fixture.

[0014] Preferably, the expansion mechanism includes a connecting inner plate, a movable groove, a movable bolt, a connecting block one, a movable sleeve, an expansion arm, and a connecting block two. A set of connecting inner plates is provided on the outer side of the central shaft near the middle end. A set of movable grooves is provided on the surface of the connecting inner plates corresponding to the position of the outer plate. A set of movable bolts is provided in each movable groove. One end of the movable bolt is connected to the connecting block one. The end of the connecting block one near the outer plate is connected to the inner side of the outer plate. A set of movable sleeves is provided on the outer side of the central shaft near the rotating part. Three sets of expansion arms are connected to the outer side of the movable sleeves. A set of connecting blocks two is provided on the other end of each expansion arm. The other end of the connecting blocks two is connected to the inner side of the outer plate.

[0015] By adopting the above technical solution, the moving sleeve and the outer expansion arm constitute the main drive system. The rotating component drives the moving sleeve to move axially, and the outer plate is pushed synchronously by three sets of outer expansion arms to achieve equidistant radial expansion, ensuring the roundness of the channel, avoiding the deviation of traditional manual adjustment, achieving high-precision controllable expansion, and adapting to complex hole diameter requirements.

[0016] Preferably, the outer side of the central shaft is provided with an external thread.

[0017] Preferably, the inner side of the rotating component is provided with a corresponding internal thread, and a set of force-applying arms is provided at both the left and right ends of the rotating component.

[0018] By adopting the above technical solution, the rotating part can be engaged with the external thread on the outside of the central shaft to achieve precise linear drive, millimeter-level hole diameter control, and self-locking anti-reverse characteristics. The thread engagement automatically locks without external force, preventing the outer expansion mechanism from accidentally shrinking during concrete vibration and ensuring molding stability.

[0019] Preferably, the inner end of the prefabricated pipe is provided with a steel reinforcement cage.

[0020] By adopting the above technical solutions, the overall strength of prefabricated pipework can be improved.

[0021] Preferably, the base plate, front and rear templates and side templates are connected by bolts, and all contact surfaces are provided with sealant.

[0022] By adopting the above technical solution, the sealing performance between pipe molds can be improved.

[0023] A method for processing prefabricated cable conduits includes the following steps:

[0024] S1: Install the base plate, front and rear templates and side templates in sequence, and connect the core tube tooling through the through holes;

[0025] S2: Before use, clean the base plate, front and rear templates, side templates and the outer side of the outer plate, and apply release agent to the inner surface to ensure smooth demolding of the components;

[0026] S3: After pretreatment of the steel bars by rust removal, straightening, cutting and welding, the steel bars are assembled into a steel bar skeleton according to the design requirements and fixed in the pipe mold. Steel plates are embedded at both ends of the prefabricated pipe section and connected with high-strength bolts.

[0027] S4: Pour concrete from above the pipe mold, starting from the four corners inside the pipe mold and then gradually pouring inwards. Use a vibrator to immerse the concrete during pouring and pour in three layers.

[0028] S5: After the pouring is completed, a plastic film is laid on top of the pipe mold to cover and cure the concrete while waiting for it to solidify.

[0029] S6: After the concrete has solidified, the pipe mold is removed, and the core pipe tooling is used to separate the core, thus completing the prefabrication of the pipe.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] 1. The present invention uses a pipe mold set on the outside of the precast pipe. The pipe mold includes components such as a base plate, front and rear templates, side templates, through holes and reinforcing ribs. When they work together, they can realize the shaping and casting of precast pipes. Furthermore, the reinforcing ribs set on the outside of the front and rear templates and the side templates can improve the strength of the front and rear templates and the side templates, so that they can effectively resist lateral pressure during the concrete pouring process and ensure the forming quality of the precast pipe.

[0032] 2. The present invention uses a core tube fixture set in a through hole. The core tube fixture includes components such as a central shaft, an expansion mechanism, and an outer plate. With their cooperation, the expansion mechanism can push the outer plate outward to expand the pipe to meet the requirements of different pipe diameters. After the outer plate expands, it forms a stable support, which can avoid the deformation of the hole caused by uneven force during casting, ensure the roundness and surface flatness of the inner wall of the pipe hole, effectively reduce the friction coefficient between the cable and the pipe wall, and reduce damage to the outside of the cable.

[0033] 3. The present invention uses a fixed block at the front end of the central shaft, and a rotating component at the rear end of the fixed block. The rotating component is sleeved on the outside of the central shaft and connected to the central shaft through an internal thread. By rotating the rotating component, it can drive the external expansion mechanism along the central shaft to squeeze and drive the external expansion mechanism, which can improve the control of the expansion size of the outer plate and meet the different size requirements of the pipe arrangement. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the present invention;

[0035] Figure 2 This is a schematic diagram of the pipe-laying mold structure of the present invention;

[0036] Figure 3 This is a schematic diagram of the core tube tooling structure of the present invention;

[0037] Figure 4 This is a schematic diagram of the external expansion mechanism of the present invention.

[0038] In the diagram: Precast pipe arrangement-1, pipe mold-2, core tube tooling-3, forming hole-11, connecting slot-12, base plate-21, front and rear templates-22, side templates-23, through hole-24, reinforcing rib-25, central shaft-31, outward expansion mechanism-32, outer plate-33, fixing block-311, rotating part-312, connecting inner plate-321, moving groove-322, moving bolt-323, connecting block one-324, moving sleeve-325, outward expansion arm-326, connecting block two-327. Detailed Implementation

[0039] To further explain the technical solution of the present invention, a detailed description is provided below through specific embodiments.

[0040] Please see Figures 1-3 This invention provides a prefabricated cable conduit and its processing method. The prefabricated cable conduit includes a prefabricated conduit 1, a conduit mold 2 in contact with the outer side of the prefabricated conduit 1, the conduit mold 2 can shape the prefabricated conduit 1, the inner end of the conduit mold 2 is equipped with at least two sets of core tube tooling 3 in an array, and the outer side of the prefabricated conduit 1 is provided with at least two sets of forming holes 11 in an array. At least two sets of connecting slots 12 are provided on both sides of the prefabricated conduit 1 near the front end, which facilitates the modular expansion of the prefabricated conduit 1. The inner end of the prefabricated conduit 1 is pre-embedded with a steel reinforcement skeleton, which can improve the overall strength of the prefabricated conduit 1.

[0041] Specifically, the dot-matrix distribution of the core tube tooling 3 and the corresponding design of the forming hole 11 enables standardized prefabrication, shortens the casting period, and multiple sets of core tube tooling 3 and forming hole 11 form a modular channel, which facilitates the addition or reduction of the number of cables later. The design of the connecting slot 12 supports the rapid docking between prefabricated pipes 1, which facilitates system expansion or partial replacement.

[0042] Please see Figure 2 The pipe laying mold 2 of the present invention includes a base plate 21, front and rear templates 22, side templates 23, through holes 24 and reinforcing ribs 25. The front and rear ends of the top surface of the base plate 21 are each bolted with a set of front and rear templates 22. The left and right ends of the top surface of the base plate 21 are each bolted with a set of side templates 23. The contact surfaces are all coated with sealant, which can improve the sealing between the pipe laying molds 2 and prevent concrete leakage. The surfaces of the front and rear templates 22 are each opened with no less than two sets of through holes 24. The front and rear templates 22 and the side templates 23 are all welded with reinforcing ribs 25 on their outer sides, which can improve the overall strength and prevent deformation.

[0043] Specifically, the base plate 21, front and rear templates 22 and side templates 23 can form a standardized mold frame, which is convenient for quick assembly and disassembly, realizes modular assembly, and can improve production efficiency. The reinforcing ribs 25 are distributed on the outside of the front and rear templates 22 and the side templates 23, which can improve the overall rigidity, prevent deformation during concrete pouring, and ensure the dimensional accuracy of the precast pipe 1.

[0044] Please see Figures 3-4 The core tube fixture 3 includes a central shaft 31, an expansion mechanism 32, and outer plates 33. Three sets of outer plates 33 are connected to the front and rear positions of the central shaft 31 through the expansion mechanism 32. A set of fixing blocks 311 is fixedly connected to the front end of the central shaft 31. A set of rotating parts 312 is sleeved on the outer side of the central shaft 31 near the front end. Furthermore, the outer side of the central shaft 31 is provided with external threads, and the inner side of the rotating parts 312 is provided with corresponding internal threads. A set of force-applying arms is provided on both the left and right ends of the rotating parts 312. The rotating parts 312 can cooperate with the external threads on the outer side of the central shaft 31 and move along the central shaft 31. It has a self-locking and anti-reverse characteristic. The threaded engagement automatically locks without external force to prevent the expansion mechanism 32 from accidentally shrinking during concrete vibration and to ensure molding stability.

[0045] Specifically, the expansion mechanism 32 can drive the three sets of outer plates 33 to radially extend and retract, flexibly adjusting the forming diameter of the core tube tooling 3 to meet the prefabrication requirements of different specifications of pipes, reducing production line adjustment time and improving efficiency. The three sets of outer plates 33 are symmetrically distributed, forming a stable support after expansion, avoiding uneven force during pouring that could cause hole deformation, and ensuring the roundness and surface flatness of the inner wall of the pipe hole. The fixing block 311 serves as the reference structure at the front end of the central shaft 31 and can cooperate with the external fixing device to achieve rapid centering and locking of the core tube tooling 3, preventing displacement during pouring. The rotating part 312 can rotate freely at the front end of the central shaft 31, controlling the opening and closing of the expansion mechanism 32. The expansion state of the outer plates 33 can be adjusted without disassembling the mold, making it easier to loosen the contact between the outer plates 33 and the concrete during the demolding stage, reducing adhesion and facilitating the removal of the core tube tooling.

[0046] Please see Figures 3-4The expansion mechanism 32 includes a connecting inner plate 321, a moving groove 322, a moving bolt 323, a connecting block 324, a moving sleeve 325, an expansion arm 326, and a connecting block 327. A set of connecting inner plates 321 is fixedly connected to the outer side of the central shaft 31 near the middle. A set of moving grooves 322 are opened on the surface of the connecting inner plates 321 at positions corresponding to the outer plate 33. A set of moving bolts 323 are slidably connected in each moving groove 322. A connecting block 324 is fixedly connected to one end of the moving bolt 323. The end of the connecting block 324 near the outer plate 33 is fixedly connected to the inner side of the outer plate 33. When the outer plate 33 expands outward, the moving bolt 323 can be moved along the moving groove 322 by the connecting block 324. A set of moving sleeves 325 is installed on the outer side of the central shaft 31 near the rotating part 312. Three sets of outward expansion arms 326 are hinged to the outer side of the moving sleeves 325. A set of connecting blocks 327 is hinged to the other end of each outward expansion arm 326. The other end of the connecting block 327 is fixedly connected to the inner side of the outer plate 33. When the moving sleeve 325 moves inward under the pressure of the rotating part 312, it can squeeze the rotating outward expansion arm 326 and expand the three sets of outer plates 33 outward through the connecting block 327.

[0047] Specifically, the movable sleeve 325 and the outer expansion arm 326 constitute the main drive system. The rotating component 312 drives the movable sleeve 325 to move axially. Through the three sets of outer expansion arms 326, the outer plate 33 is pushed synchronously to achieve equidistant radial expansion, ensuring the roundness of the hole, avoiding the deviation of traditional manual adjustment, achieving high-precision controllable expansion, and adapting to complex hole diameter requirements.

[0048] A method for processing prefabricated cable conduits includes the following steps:

[0049] S1: Install two sets of front and rear templates 22 and side templates 23 sequentially on the top front, rear, left and right ends of the base plate 21, and fix them with bolts. Apply sealant to the contact surfaces and gaps. Then connect the core tube fixture 3 through the through hole 24. During installation, apply lubricant to the outside of the core tube fixture 3 that shrinks on the outer plate 33, then put on the rubber sleeve and insert it into the through hole 24 in sequence. Each set of central shafts 31 should extend to the outer ends of the front and rear templates 22 by at least 15 cm. After all the core tube fixtures 3 are installed in place, rotate the rotating part 312. The rotating part 312 pushes the moving sleeve 325 inward, driving the outer expansion arm 326 to rotate, supporting the outer plate 33 and expanding it to an outer diameter of 175 mm.

[0050] S2: Before use, clean the outer sides of the base plate 21, front and rear templates 22 and side templates 23, and apply release agent to their inner surfaces to ensure smooth demolding of the components;

[0051] S3: After pretreatment by removing rust, straightening, cutting and welding the reinforcing bars, they are assembled into a reinforcing bar skeleton according to the design requirements and fixed in the pipe mold 2. At the same time, steel plates are embedded at both ends of the prefabricated section of the prefabricated pipe 1 and connected with high-strength bolts. The main reinforcing bars are HRB400 grade, the reinforcing bars of the connecting embedded parts are HRB500 grade, and the steel plates are Q355 grade.

[0052] S4: Use a torpedo canister to transport concrete to the top of the pipe mold 2. First, pour concrete from the four corners inside the mold to help establish a stable foundation for the subsequent pouring work. Then, gradually pour concrete into the inside of the mold to ensure that the entire mold is evenly filled. At the same time, cover the internal steel mesh and core pipe fixture 3. It should be noted that this precast pipe 1 has three rows of holes and concrete needs to be poured in three layers. During the pouring process, select an immersion type, attachment type, or plate type vibrator according to the structural dimensions and steel reinforcement density to vibrate the concrete. The speed should be between 12,000 rpm and 15,000 rpm. Vibrating the poured concrete can effectively remove air bubbles in the concrete. Within this pressure range, it is necessary to ensure that the concrete flows freely in the mold while controlling the stability of the concrete under high pressure to prevent the mold from deforming or the seal from breaking due to excessive pressure.

[0053] S5: After the pouring is completed, a plastic film is laid on top of the pipe mold 2 to cover and cure the concrete while waiting for it to solidify.

[0054] S6: After the concrete has solidified and the concrete strength reaches 2.5MPa or above, rotate the rotating part 312 and pull out the moving sleeve 325 so that the outer plate 33 shrinks to an outer diameter of 15 cm and is then pulled out. After all the petal-shaped fixtures are removed, pull out the rubber sleeve to complete the prefabrication of the pipe.

[0055] This invention provides a precast cable conduit and its processing method. A conduit mold 2, located outside the precast conduit 1, includes components such as a base plate 21, front and rear templates 22, side templates 23, through holes 24, and reinforcing ribs 25. These components work together to shape and cast the precast conduit 1. The reinforcing ribs 25, located outside the front and rear templates 22 and side templates 23, enhance the strength of these templates, effectively resisting lateral pressure during concrete pouring and ensuring the quality of the precast conduit 1. A core tube fixture 3, located within the through holes 24, includes components such as a central shaft 31, an expansion mechanism 32, and an outer plate 33. These components work together to allow the expansion mechanism 32 to... The outer expansion plate 33 is pushed outward to accommodate pipes of different diameters. After expansion, the outer plate 33 forms a stable support, which can prevent hole deformation caused by uneven force during pouring, ensure the roundness and surface flatness of the inner wall of the pipe hole, effectively reduce the friction coefficient between the cable and the pipe wall, and reduce damage to the outside of the cable. A fixing block 311 is set at the front end of the central shaft, and a rotating part 312 is provided at the rear end of the fixing block 311. The rotating part 312 is sleeved on the outside of the central shaft 31 and connected to the central shaft 31 through internal threads. By rotating the rotating part 312, it can be driven to move along the central shaft 31 towards the outward expansion mechanism 32, and squeeze the outward expansion mechanism 32. This can improve the control of the expansion size of the outer plate 33 and meet the different size requirements of the pipe.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A prefabricated cable duct, characterized in that: It includes a prefabricated pipe (1), the outside of which is connected to a pipe mold (2), and the inner end of the pipe mold (2) is provided with no less than two sets of core tube fixtures (3). The prefabricated pipe (1) has at least two sets of forming holes (11) on the outside, and at least two sets of connecting slots (12) are provided on both sides of the prefabricated pipe (1) near the front end. The core tube fixture (3) includes a central shaft (31), an expansion mechanism (32) and an outer plate (33). The central shaft (31) has three sets of outer plates (33) connected to the front and rear positions of the outer side through the expansion mechanism (32).

2. The prefabricated cable conduit according to claim 1, characterized in that: The pipe mold (2) includes a base plate (21), front and rear templates (22), side templates (23), through holes (24) and reinforcing ribs (25). The front and rear ends of the top surface of the base plate (21) are connected to a set of front and rear templates (22). The left and right ends of the top surface of the base plate (21) are provided with a set of side templates (23). The surfaces of the front and rear templates (22) are provided with no less than two sets of through holes (24). The outer sides of the front and rear templates (22) and the side templates (23) are provided with reinforcing ribs (25).

3. The prefabricated cable conduit according to claim 1, characterized in that: The central shaft (31) has a set of fixing blocks (311) at the front end, and a set of rotating parts (312) are connected to the outer side of the central shaft (31) near the front end.

4. The prefabricated cable conduit according to claim 1, characterized in that: The expansion mechanism (32) includes a connecting inner plate (321), a moving groove (322), a moving bolt (323), a connecting block one (324), a moving sleeve (325), an expansion arm (326), and a connecting block two (327). A set of connecting inner plates (321) is provided on the outer side of the central shaft (31) near the middle end. A set of moving grooves (322) is provided on the surface of the connecting inner plates (321) corresponding to the position of the outer plate (33). A set of moving bolts (323) is provided in each of the moving grooves (322). One end of the movable bolt (323) is connected to a connecting block one (324). The end of the connecting block one (324) near the outer plate (33) is connected to the inner side of the outer plate (33). A set of movable sleeves (325) is provided on the outer side of the central shaft (31) near the rotating part (312). Three sets of outer expansion arms (326) are connected to the outer side of the movable sleeves (325). A set of connecting blocks two (327) is provided on the other end of each of the outer expansion arms (326). The other end of the connecting blocks two (327) is connected to the inner side of the outer plate (33).

5. The prefabricated cable conduit according to claim 4, characterized in that: The outer side of the central shaft (31) is provided with external threads.

6. The prefabricated cable conduit according to claim 5, characterized in that: The rotating part (312) has a corresponding internal thread on its inner side, and a set of force-applying arms is provided at both the left and right ends of the rotating part (312).

7. The prefabricated cable conduit according to claim 1, characterized in that: The inner end of the prefabricated pipe (1) is provided with a steel reinforcement cage.

8. The prefabricated cable conduit according to claim 2, characterized in that: The base plate (21), front and rear templates (22) and side templates (23) are connected by bolts, and all contact surfaces are provided with sealant.

9. A method for processing a prefabricated cable conduit, wherein the prefabricated cable conduit is described in any one of claims 1-8, characterized in that, Includes the following steps: S1: Install the base plate (21), front and rear templates (22) and side templates (23) in sequence, and connect the core tube fixture (3) through the through hole (24); S2: Before use, clean the base plate (21), front and rear templates (22), side templates (23) and the outer side of the outer plate (33), and apply release agent to their inner surfaces to ensure that the components can be demolded smoothly; S3: After pre-treatment of the steel bars by rust removal, straightening, cutting and welding, the steel bars are assembled into a steel bar skeleton according to the design requirements and fixed in the pipe mold (2). The prefabricated pipe (1) prefabricated sections have steel plates embedded at both ends and are connected by high-strength bolts. S4: Concrete is poured from above the pipe mold (2). First, it is poured from the four corners inside the pipe mold (2), and then gradually poured inwards. When pouring, a vibrator is used to insert and vibrate the concrete, and it is poured in three layers. S5: After the pouring is completed, a plastic film is laid on top of the pipe mold (2) to cover and cure the concrete while waiting for it to solidify. S6: After the concrete has solidified, the pipe mold (2) is removed and the core pipe tool (3) is used for core extraction and separation to complete the prefabrication of the pipe.

Images