A prefabricated power duct

Abstract

This utility model discloses a prefabricated power duct, including a duct body with multiple reinforcing bars cast inside. The duct body has an inner cavity with a pipe hole. Multiple lifting rings are fixedly connected to the upper surface of the duct body. A limiting component is fixedly installed inside the pipe hole to clamp cables of different diameters, ensuring cable operation safety. A protective component for wrapping the cable is slidably installed inside the pipe hole to prevent damage to the cable insulation layer and ensure cable lifespan. The limiting component and the protective component work together to clamp and fix the cable, ensuring that the cable does not shift or loosen during long-term operation. It also accurately corrects the direction during the initial cable insertion, reducing the risk of scratches caused by angular deviations. This comprehensively protects the cable insulation layer, preventing faults caused by friction, displacement, or entanglement, ensuring long-term stable cable operation, and reducing maintenance risks and costs.

Description

Technical Field

[0001] This utility model relates to the field of power duct technology, specifically a prefabricated power duct. Background Technology

[0002] Precast power cable conduits are a type of prefabricated pipe system used for laying power cables. These pipes are manufactured in a factory using a prefabrication process and are buried underground to provide a passage and protection for power cables. They are characterized by convenient construction and stable performance and are widely used in the field of power engineering.

[0003] Chinese patent discloses a novel prefabricated power duct (authorization announcement number CN221232806U), including an installation mechanism, a duct body, and a sleeve assembly disposed on the outside of the duct body. The sleeve assembly includes a collar and a connecting rod. The collar is sleeved on the outside of the duct body, and the two ends of the connecting rod are fixedly connected to the outer walls of the two collars respectively. The control mechanism includes an L-shaped rod disposed on the outer wall of the collar. The side wall of the L-shaped rod has an internally threaded through hole, and a screw is movably connected inside the internally threaded through hole. An anti-collision end is fixedly connected to one end of the screw near the outer wall of the duct body. This patented technology uses a support handle to rotate the screw, thereby adjusting the distance between the support handle and the outer wall of the duct body. After the distance is adjusted, workers lay the structural steel bars and then assemble the template, so that the support handle contacts and fits against the inner wall of the template for support, facilitating the formation of a stable structure. The spacing is convenient for workers to install and construct. However, in the complex operating environment of the power system, the cable specifications and sizes are diverse. Due to the different cable sizes, during long-term operation, the continuous current heating effect causes thermal expansion and contraction, the mechanical stress under the action of electromagnetic force, and the pulling and dragging caused by the external environment. These factors combine to cause the cable to shift, loosen, or even become entangled. However, this patent lacks an effective clamping and fixing structure that can adapt to different cable sizes. It is difficult to avoid the cable shifting and loosening during long-term operation. It also cannot avoid the insulation wear caused by mechanical compression, the scraping caused by the angle deviation during threading, and the hard friction with the inner wall of the pipe hole. This reduces the power transmission efficiency of the cable and may cause serious safety hazards such as short circuits and leakage. It directly affects the stable operation of the equipment and increases the operation and maintenance risks and costs.

[0004] Therefore, this utility model provides a prefabricated power duct to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this invention is to provide a prefabricated power duct to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A prefabricated power duct includes a pipe body, the inside of which is filled with multiple steel bars to enhance its strength. The inner cavity of the pipe body has a pipe hole for passing through a cable. The upper surface of the pipe body is fixedly connected with multiple lifting rings for hoisting and transporting the pipe body.

[0008] A limiting component is fixedly installed inside the tube hole to hold cables of different diameters, ensuring safe operation of the cables. A protective component for wrapping the cable is slidably installed inside the tube hole to avoid damaging the cable's insulation layer and ensure the cable's service life.

[0009] As a further embodiment of this utility model, the limiting component includes a fixed frame, which is fixedly installed inside the pipe hole. A plurality of clamping blocks for clamping and fixing cables are slidably connected to one side of the fixed frame, and the plurality of clamping blocks are closely fitted and distributed together. A drive disk for driving the clamping blocks to rotate is slidably connected to the side of the clamping blocks away from the fixed frame.

[0010] As a further embodiment of this utility model, the drive disk is configured as a worm gear disk, and the inner cavity of the pipe body is rotatably connected to a rotating rod for providing rotational power to the drive disk. The outer wall of the rotating rod is fixedly fitted with a worm sleeve, which meshes with the drive disk.

[0011] As a further embodiment of this utility model, the protective component includes a movable tube located inside the tube hole, and is isolated to prevent the cable insulation layer from being damaged by wear. Both ends of the movable tube are slidably connected to guide plates for guiding the cable to be accurately inserted into the limiting component. The inner wall of the movable tube is fixedly installed with a protective sleeve for reducing wear on the cable surface.

[0012] As a further embodiment of this utility model, the outer surface of the pipe body is provided with two sets of vertical splicing screw holes and longitudinal splicing screw holes, both of which are used for splicing and fixing multiple sets of pipe bodies.

[0013] As a further embodiment of this utility model, the upper surface of the pipe body is fixedly connected with a connecting steel plate for assisting in splicing and fixing the pipe body by bolts. A planar connecting groove is opened on the top surface of the pipe body, and the connecting steel plate is located in the planar connecting groove. The connecting steel plate is used to further ensure the installation accuracy of the device.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. When this utility model is used, the limiting component and the protective component work together. The clamping block of the limiting component, in conjunction with the worm gear self-locking structure, clamps and fixes the cable, ensuring that the cable does not shift or loosen during long-term operation. Combined with the flexible buffer of the silicone pad, it can effectively avoid direct contact between the clamping block and the cable surface, reducing the wear of the insulation layer caused by mechanical extrusion. At the same time, the tapered guide plate 602 of the protective component uses a gradual guiding structure to accurately correct the direction in the early stage of cable insertion, reducing the risk of scratches caused by angular deviation. The silicone protective sleeve on the inner wall forms an isolation layer through flexible wrapping, effectively avoiding hard friction with the inner wall of the tube hole during the cable insertion process. Thus, it protects the cable insulation layer in all aspects, avoiding faults caused by friction, displacement, entanglement, etc., ensuring the long-term stable operation of the cable, and reducing operation and maintenance risks and costs.

[0016] 2. When using this utility model, multiple sets of pipe bodies are modularly spliced ​​in the vertical and horizontal directions by using bolts to fasten them through vertical and longitudinal splicing screw holes. The length and layout of the pipes can be flexibly adjusted according to actual engineering needs, enhancing the applicability of the device in different construction scenarios. With the connecting steel plate embedded in the connecting groove on the top plane of the pipe body, stress concentration is effectively dispersed, ensuring the flatness and verticality of the splice, greatly improving the installation accuracy and the stability of the overall structure. At the same time, combined with the rubber sealing rings embedded in the connecting ends of the left and right ends of the pipe body, the rubber sealing rings use their own elastic deformation ability to tightly fill the gaps during the splicing process, forming a highly efficient waterproof barrier that can resist groundwater seepage and silt intrusion, ensuring a safe and reliable environment for cable installation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a prefabricated power duct.

[0018] Figure 2 This is a structural cross-sectional view of a prefabricated power duct.

[0019] Figure 3 This is a structural exploded view of a limiting component in a prefabricated power duct.

[0020] Figure 4 This is a structural cross-sectional view of a protective component in a prefabricated power duct.

[0021] Figure 5 This is a schematic diagram of the structure of the pipe body in a prefabricated power duct.

[0022] In the diagram: 1. Pipe body; 2. Reinforcing steel; 3. Pipe hole; 4. Lifting ring;

[0023] 5. Limiting assembly; 501. Fixing frame; 502. Clamping block; 503. Drive disk; 504. Drive shaft; 505. Auxiliary rod; 506. Silicone pad; 507. Rotating rod; 508. Worm gear sleeve;

[0024] 6. Protective components; 601. Moving tube; 602. Guide plate; 603. Protective sleeve; 604. Sliding block; 605. Adjusting rod; 606. Thrust spring;

[0025] 7. Vertical splicing screw holes; 8. Longitudinal splicing screw holes; 9. Connecting steel plate; 10. Rubber sealing ring. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1-4 In this embodiment of the utility model, a prefabricated power duct includes a pipe body 1, with multiple steel bars 2 cast inside the pipe body 1 to enhance its strength. The inner cavity of the pipe body 1 is provided with a pipe hole 3, which serves as a channel for passing cables through. Multiple lifting rings 4 for hoisting and transporting the pipe body 1 are fixedly connected to the upper surface of the pipe body 1.

[0028] Due to differences in cable diameter, gaps exist between the bore 3 and the cable. When multiple cables are threaded side-by-side, they may become disorganized due to lack of fixation, resulting in insufficient heat dissipation space. Furthermore, cables lacking fixation may shift, become entangled, or even cause short circuits when subjected to external vibrations or environmental changes. To address these issues, a limiting component 5 is fixedly installed inside the bore 3. This component securely clamps cables of different diameters, ensuring safe cable operation. Additionally, if the bore 3's diameter is not properly matched to the cable diameter, excessive friction during threading may damage the cable insulation, affecting its lifespan. Therefore, a protective component 6 is slidably installed inside the bore 3 to wrap the cable, preventing damage to the insulation and ensuring the cable's lifespan.

[0029] Please see Figure 2 , Figure 3 The limiting component 5 includes a fixed frame 501 for providing a support base. The fixed frame 501 is fixedly installed inside the pipe hole 3 and is fixedly connected to the inner wall of the pipe body 1. A plurality of clamping blocks 502 for clamping and fixing cables are slidably connected to one side of the fixed frame 501, and the plurality of clamping blocks 502 are closely fitted and distributed together. A drive disk 503 for driving the clamping block 502 to rotate is slidably connected to the side of the clamping block 502 away from the fixed frame 501.

[0030] Specifically, a drive shaft 504 for transmitting rotational power is fixedly connected to one side of the clamping block 502, a drive groove is opened in the inner cavity of the drive disk 503, and the drive shaft 504 is located in the drive groove. An auxiliary rod 505 for assisting the clamping block 502 to slide smoothly is fixedly connected to the other side of the clamping block 502, an auxiliary groove is opened in the inner cavity of the fixing frame 501, and the auxiliary rod 505 is located in the auxiliary groove.

[0031] More specifically, multiple clamping blocks 502 are symmetrically and evenly distributed. They open and close by following the rotation of the drive disk 503, thereby adjusting the size of the opening and closing aperture so that the clamping blocks 502 can fix and clamp the cable. Each clamping block 502 has a silicone pad 506 fixedly installed on the side that is close to each other to reduce wear. The silicone pad 506 is soft and elastic, which can effectively reduce the direct friction between the clamping block 502 and the cable surface and prevent the cable surface from being worn or scratched due to compression.

[0032] More specifically, both the fixed frame 501 and the drive disk 503 have through holes at their centers to facilitate cable threading;

[0033] The drive disk 503 is a worm gear disk. The inner cavity of the pipe body 1 is rotatably connected to a rotating rod 507 for providing rotational power to the drive disk 503. The outer wall of the rotating rod 507 is fixedly sleeved with a worm sleeve 508, which meshes with the drive disk 503.

[0034] Specifically, the inner cavity of the pipe body 1 is provided with a rotating groove for providing the rotation of the rotating rod 507, and the rotating rod 507 is located in the rotating groove. One end of the rotating rod 507 extends to be flush with the outer surface of the pipe body 1 and is provided with a slot, so as to facilitate the use of an adapter tool to insert into the slot to drive the rotating rod 507 to rotate.

[0035] More specifically, the rotating rod 507 drives the worm gear sleeve 508 to rotate, transmitting the rotational power to the drive disk 503, thereby achieving stable rotation of the drive disk 503. At the same time, by utilizing the self-locking characteristic of the worm gear transmission, the drive disk 503 can be automatically locked after rotating to the target position, preventing reverse rotation due to external forces and ensuring the stability of the device operation.

[0036] Please see Figure 2 , Figure 4The protective component 6 includes a movable tube 601 located inside the tube hole 3. Through isolation, it effectively avoids friction caused by direct contact between the cable and the inner wall of the tube hole 3 during cable threading, preventing damage to the cable insulation layer due to wear, ensuring smooth cable threading and safe operation in the later stage. Both ends of the movable tube 601 are slidably connected to guide plates 602 for guiding the cable to be accurately inserted into the limiting component 5. Both sets of guide plates 602 are conical in shape. Their conical design can use the gradually changing slope to guide and gather the cable when it is threaded in, allowing the cable to be inserted into the limiting component 5 more accurately and smoothly. At the same time, it can adapt to the threading guidance needs of cables with different diameter ranges. The inner wall of the movable tube 601 is fixedly installed with a protective sleeve 603 to reduce wear on the cable surface.

[0037] Specifically, sliding blocks 604 are fixedly installed at both the upper and lower ends of the moving tube 601. The inner wall of the tube body 1 is provided with a sliding groove for the sliding block 604 to slide, and the sliding block 604 is located in the sliding groove to realize the sliding connection between the moving tube 601 and the tube body 1. The protective sleeve 603 is made of silicone material, which has good flexibility and wear resistance.

[0038] More specifically, each guide plate 602 is fixedly connected to an adjusting rod 605 on the side near the moving tube 601. A thrust spring 606 is fixedly connected to the outer wall of the adjusting rod 605. The thrust spring 606 is used to push the guide plate 602 to fit against the outer wall of the cable, so that the guide plate 602 can adaptively adjust its position according to the actual diameter of the cable, and always maintain effective guidance and initial limitation of the cable. The inner cavity of the moving tube 601 is provided with multiple adjusting grooves, and the adjusting rod 605 and the thrust spring 606 are both located in the adjusting grooves, providing space for the movement of the adjusting rod 605 and the extension and retraction of the thrust spring 606.

[0039] Please see Figure 5 The outer surface of the pipe body 1 is provided with two sets of vertical splicing screw holes 7 and longitudinal splicing screw holes 8, both of which are used for splicing and fixing between multiple sets of pipe bodies 1.

[0040] Specifically, bolts are threaded into the vertical splicing bolt holes 7 and the longitudinal splicing bolt holes 8. The bolts tighten to reliably connect multiple sets of pipe bodies 1 in the vertical and longitudinal directions, forming a stable overall structure. This ensures that the entire device can withstand external forces such as soil pressure and ground load after being buried, preventing the splice joints from loosening or misaligning due to stress, ensuring the sealing and structural safety of the device, and meeting the long-term stability requirements of cable installation.

[0041] The upper surface of the pipe body 1 is fixedly connected with a connecting steel plate 9 for assisting in splicing and fixing the pipe body 1 by bolts. The top surface of the pipe body 1 is provided with a planar connecting groove, and the connecting steel plate 9 is located in the planar connecting groove. The connecting steel plate 9 is used to further ensure the installation accuracy of the device.

[0042] Specifically, both ends of the pipe body 1 are designed as connection ends for splicing, and are embedded with rubber sealing rings 10 for waterproof sealing. Multiple sets of pipe bodies 1 can be spliced ​​through the connection ends to form a continuous pipe system. At the same time, the elastic compression of the rubber sealing rings 10 fills the splicing gaps, preventing groundwater, mud and other media from seeping into the pipe, ensuring the waterproof sealing and structural integrity of the pipe, and ensuring a safe and reliable environment for cable installation.

[0043] The working principle of this utility model is as follows:

[0044] When using this utility model, when splicing multiple sets of pipe bodies 1, the vertical splicing screw holes 7 and the longitudinal splicing screw holes 8 are used to fasten the multiple sets of pipe bodies 1 into a stable overall structure by bolting. The connecting steel plate 9 and bolts are used to assist in splicing and fixing to ensure installation accuracy. Rubber sealing rings 10 are embedded in the connecting ends of the left and right ends of the pipe body 1. When splicing, their elastic compression is used to fill the gaps to prevent groundwater and silt from seeping in, thus ensuring the waterproof sealing and structural integrity of the pipe.

[0045] Then, when the cable is threaded, the cable first contacts the tapered guide plate 602. The tapered guide plate 602 uses a gradually increasing slope to guide and gather the cable, so that it is accurately inserted into the moving tube 601. The adjusting rod 605 and the thrust spring 606 connected to the guide plate 602 are in the adjusting groove of the moving tube 601. The thrust spring 606 pushes the guide plate 602 to fit the cable and adaptively adjusts the position to initially limit it. At the same time, during the process of pushing the cable, the moving tube 601 is driven to slide in the tube hole 3 through the sliding block 604 and the sliding groove of the inner wall of the tube body 1. This allows the cable to be accurately inserted into the limiting component 5. The protective sleeve 603 wraps the cable to reduce friction with the inner wall of the tube hole 3 during threading and protect the insulation layer.

[0046] After the cable is installed, the rotating rod 507 is turned with a tool (such as a screwdriver) to drive the worm gear sleeve 508, which in turn drives the drive plate 503 to rotate. The drive plate 503 cooperates with the drive shaft 504 of the clamping block 502 through the transmission groove, so that multiple symmetrically and evenly distributed clamping blocks 502 rotate with it to open and close. At the same time, the clamping blocks 502 slide in the auxiliary groove of the fixed frame 501 with the help of the auxiliary rod 505 to ensure smooth operation. By adjusting the opening and closing hole diameter, and with the help of the silicone pad 506, cables of different diameters can be fixedly clamped. The self-locking characteristic of the worm gear is used to lock the position of the drive plate 503, firmly clamping the cable, effectively preventing cable displacement and tangling, ensuring operational safety, improving heat dissipation efficiency, and reducing the risk of failure.

[0047] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A prefabricated power duct, comprising a duct body (1), characterized in that, The pipe body (1) is filled with multiple steel bars (2) to strengthen the strength of the pipe body (1). The inner cavity of the pipe body (1) is provided with pipe holes (3) for cable passage. The upper surface of the pipe body (1) is fixedly connected with multiple lifting rings (4) for hoisting and transporting the pipe body (1). A limiting component (5) is fixedly installed inside the tube hole (3). Cables of different diameters are fixedly clamped by the limiting component (5) to ensure the safe operation of the cable. A protective component (6) for wrapping the cable is slidably installed inside the tube hole (3) to avoid damaging the insulation layer of the cable and to ensure the service life of the cable.

2. The prefabricated power duct according to claim 1, characterized in that, The limiting component (5) includes a fixed frame (501), which is fixedly installed in the pipe hole (3). A plurality of clamping blocks (502) for clamping and fixing cables are slidably connected to one side of the fixed frame (501), and the plurality of clamping blocks (502) are closely fitted and distributed together. A drive disk (503) for driving the clamping block (502) to rotate is slidably connected to the side of the clamping block (502) away from the fixed frame (501).

3. A prefabricated power duct according to claim 2, characterized in that, The drive disc (503) is a worm gear disc. The inner cavity of the pipe body (1) is rotatably connected to a rotating rod (507) for providing rotational power to the drive disc (503). The outer wall of the rotating rod (507) is fixedly fitted with a worm sleeve (508), which meshes with the drive disc (503).

4. A prefabricated power duct according to claim 1, characterized in that, The protective component (6) includes a movable tube (601) located inside the tube hole (3) and is isolated to prevent the cable insulation layer from being damaged by wear. Both ends of the movable tube (601) are slidably connected to guide plates (602) for guiding the cable to be accurately inserted into the limiting component (5). The inner wall of the movable tube (601) is fixedly installed with a protective sleeve (603) for reducing wear on the cable surface.

5. A prefabricated power duct according to claim 1, characterized in that, The outer surface of the pipe body (1) is provided with two sets of vertical splicing screw holes (7) and longitudinal splicing screw holes (8), both of which are used for splicing and fixing between multiple sets of pipe bodies (1).

6. A prefabricated power duct according to claim 1, characterized in that, The upper surface of the pipe body (1) is fixedly connected with a connecting steel plate (9) for assisting in splicing and fixing the pipe body (1) by bolts. The top surface of the pipe body (1) is provided with a planar connecting groove, and the connecting steel plate (9) is located in the planar connecting groove. The connecting steel plate (9) is used to further ensure the installation accuracy of the device.

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