A method for constructing electric power pipes

Abstract

The present invention relates to the field of cable conduit technology, and solves the technical problems in the prior art that after a power conduit is partially damaged, the damaged part cannot be replaced separately and the power conduit construction method is unreasonable. A power conduit construction method comprises casting a concrete support layer on the bottom wall of the tunnel, wherein the thickness of the concrete support layer is not less than 10 cm, and casting a concrete anti-slip layer on the side wall at the same time as casting the concrete support layer, wherein the thickness of the concrete anti-slip layer is not less than the thickness of the concrete support layer. The above-mentioned construction method is used for construction, which can effectively improve the strength of the tunnel after backfilling, and the tunnel is not easily damaged and has a high compressive strength. The upper protective pipe and the lower protective pipe are mainly provided to protect the power conduit, and the upper protective pipe cooperates with the lower protective pipe, and the upper protective pipe can be removed independently, making the construction operation very convenient. Moreover, the upper protective pipe can also be conveniently removed during the later maintenance process to perform maintenance on the power conduit.

Description

Technical Field

[0001] The present invention relates to the technical field of cable conduits, and in particular to a method for constructing a power conduit. Background Art

[0002] Power conduits, also known as power cable protection conduits or cable protection conduits, are categorized into trenched and trenchless types. Due to their large diameter, they house numerous cables. Multiple cables are stacked and crisscrossed, resulting in poor space utilization and prone to wire entanglement, hindering line maintenance and connection. Furthermore, the stacking of multiple cables concentrates heat, causing localized overheating and shortening the cable's service life.

[0003] Existing power pipes suffer from structural issues. For example, they can suffer local damage over long periods of use, such as from external forces or cable burns. Damaged pipes can only be replaced as a whole, rather than individually replacing the damaged section. This increases the cost of using and maintaining the pipes.

[0004] In addition, there is a technical problem of unreasonable construction methods for power pipes in the existing technology. During the construction process of power pipes in the existing technology, a protective pipe is usually laid directly after the tunnel is completed, and then the power pipe is laid in the protective pipe, and then the tunnel is backfilled to complete the construction. This construction method causes the tunnel to have poor bearing capacity, and the tunnel is easily damaged during long-term use, which in turn causes damage to the power pipe. Summary of the Invention

[0005] The present invention provides a power pipe construction method, which solves the technical problems in the prior art that the damaged part of the power pipe cannot be replaced separately after it is partially damaged and the power pipe construction method is unreasonable.

[0006] Some implementation plans adopted to solve the above technical problems include:

[0007] A method for constructing an electric power pipe.

[0008] According to the cable route, a tunnel is excavated at the target location. The depth of the tunnel is not less than twice the maximum outer diameter of the power pipe installed in the tunnel. The tunnel includes a bottom wall and side walls. The side walls are inclined relative to the bottom wall. The cross-section of the tunnel is a trapezoidal shape that is wide at the top and narrow at the bottom.

[0009] Casting a concrete support layer on the bottom wall of the tunnel, the thickness of the concrete support layer being not less than 10 cm; casting a concrete anti-slip layer on the side wall at the same time as casting the concrete support layer, the thickness of the concrete anti-slip layer being not less than the thickness of the concrete support layer;

[0010] Before the concrete support layer solidifies, drain outlets are provided on the concrete support layer, and the drain outlets are evenly distributed on the concrete support layer;

[0011] After the concrete support layer and the concrete anti-slip layer solidify, filling the tunnel with a stone layer, wherein the thickness of the stone layer is not less than 1 / 3 of the depth of the tunnel;

[0012] Laying a lower protective pipe on the stone layer, wherein the cross-section of the lower protective pipe is semicircular and has a lower concave cavity;

[0013] 18. The electrical conduit of claim 17, wherein the at least one outer tube body is configured to extend outwardly from the outer tube body and is configured to extend outwardly past at least two of the at least two outer tube bodies. The at least two outer tube bodies are uniformly distributed around the circumference ...

[0014] After the power pipe is laid, the cable is laid inside the power pipe. After the cable is laid, the cable is tested until it meets the use requirements;

[0015] Backfilling the tunnel with a stone layer so that the upper side of the stone layer is flush with the upper side of the lower protective pipe, and laying an upper protective pipe in the tunnel, wherein the cross-section of the upper protective pipe is semicircular and has an upper concave cavity, wherein a portion of the power pipe is located in the upper concave cavity, the upper protective pipe does not contact the lower protective pipe, and the upper protective pipe abuts against the concrete anti-slip layer;

[0016] Backfill the tunnel with a layer of stones again, and ensure that the distance between the upper side of the stone layer and the outer wall of the upper protective pipe is not less than 30 cm;

[0017] laying a protective layer on the upper side of the stone layer, wherein the protective layer contacts the concrete anti-slip layer;

[0018] Soil is backfilled on the upper side of the protective layer to form a backfill layer, and the upper side surface of the backfill layer is flush with the top surface of the tunnel.

[0019] The above construction method can effectively improve the strength of the tunnel after backfilling. During long-term use, the tunnel is not easily damaged and has high compressive strength. This makes the tunnel less prone to damage, and further makes the power pipes less prone to damage.

[0020] The upper and lower protective tubes are designed to protect the power pipes. The upper and lower protective tubes work together, allowing the upper tube to be removed independently, making installation and operation very convenient. Furthermore, during later maintenance, the upper tube can be easily removed to access the power pipes.

[0021] The stone layer can effectively disperse the force exerted on the tunnel, thereby protecting the power pipes, which are not easily damaged.

[0022] In actual use, a portion of the outer tube is first assembled with the core tube. The outer tube, which is then assembled to the core tube, is then positioned below the core tube. The remaining outer tube is then assembled to the core tube to complete the assembly of the power tube. The cable is then assembled into the space on the power tube using conventional cable assembly methods, completing the cable installation.

[0023] The power tube consists of an outer tube body and a core tube. The outer tube body is fixed to the core tube via positioning ribs. Therefore, if the outer tube body or core tube is partially damaged, the power tube can be easily disassembled and only the damaged part can be replaced, without having to replace the entire power tube. This reduces the maintenance and operating costs of the power tube.

[0024] By providing an inner flame retardant tube and an outer flame retardant tube, a fire in the cable inside the outer tube body or the core tube will not affect other parts of the power tube. In other words, damage to a local cable inside the power tube will not damage the entire power tube, but only cause local damage to the power tube. Therefore, when maintaining the power tube, only part of the power tube needs to be replaced, further reducing the use and maintenance costs of the power tube.

[0025] Preferably, the concrete anti-slip layer is provided with a step structure, and there are at least two step structures, wherein the upper protective pipe and the protective layer respectively conflict with different step structures.

[0026] In this solution, by providing a step structure, the step structure can effectively support the protective layer and the upper protective pipe.

[0027] Preferably, the upper protective pipe and the lower protective pipe are both made of reinforced concrete, wherein the upper protective pipe is provided with an extended shoulder in contact with the concrete anti-slip layer, the extended shoulder and the upper protective pipe are an integrated structure, and the extended shoulder is arranged horizontally.

[0028] In this solution, by providing an extended shoulder, the upper protective pipe and the step structure have high strength.

[0029] Preferably, the protective layer is made of reinforced concrete, the thickness of the protective layer is not less than 10 cm, and the cross-section of the protective layer is arc-shaped.

[0030] In this solution, the protective layer has high strength, which extends the service life of the protective layer.

[0031] Preferably, the inner flame retardant tube and the outer flame retardant tube both include an insulating outer wall and a flame retardant inner wall, a flame retardant space is formed between the insulating outer wall and the flame retardant inner wall, the flame retardant space is filled with flame retardant sand, and both ends of the flame retardant space are closed by the insulating outer wall.

[0032] In this solution, by filling the fire-retardant sand, the cable can be extinguished when it catches fire, thereby effectively preventing the power pipe from being damaged over a large area and further reducing the maintenance cost of the power pipe.

[0033] Preferably, the flame-retardant inner wall is bonded to the heat-insulating outer wall, and the flame-retardant inner wall is in contact with the cables arranged in the space.

[0034] In this solution, the inner flame retardant tube and the outer flame retardant tube are easy to process, which reduces the processing costs of the inner flame retardant tube and the outer flame retardant tube.

[0035] Preferably, the flame-retardant inner wall includes a flame-retardant film and a flammable strip arranged on the flame-retardant film, the width of the flammable strip is not greater than 1 / 5 of the width of the flame-retardant inner wall, and the flame-retardant film and the flammable strip are bonded together.

[0036] In this solution, by setting up flammable strips, the flammable strips are quickly damaged after the cable catches fire, so that the flame retardant sand can be quickly discharged from the flame retardant space, and the burning cable can be extinguished in time, thereby optimizing the performance of the inner and outer flame retardant tubes.

[0037] Preferably, the flammable strips include horizontal strips arranged axially along the flame retardant inner wall and vertical strips arranged circumferentially along the flame retardant inner wall, the horizontal strips are evenly arranged along the circumferential direction of the flame retardant inner wall, and the vertical strips are evenly arranged along the axial direction of the flame retardant inner wall.

[0038] In this solution, the flammable strips are reasonably arranged. After the flammable strips are damaged, the flame retardant sand can be quickly discharged, thereby improving the fire extinguishing efficiency of the flame retardant sand.

[0039] Preferably, the cross-sectional shape of the positioning rib is an arc shape larger than 1 / 2 circle, the positioning rib is bonded to the core tube, and the positioning rib is evenly arranged along the circumference of the core tube.

[0040] In this solution, the positioning ribs are easy to process, and the outer tube body is easy to assemble with the positioning ribs.

[0041] Preferably, both ends of the outer tube body are provided with connecting shoulders for facilitating connection of the power pipe, the connecting shoulders and the outer tube body are an integral structure, and the connecting shoulders are provided with splicing holes.

[0042] In this solution, by providing a connecting shoulder, the power pipe is easy to splice.

[0043] Preferably, the connecting shoulder protrudes from the outer side wall of the outer tube body, and the connecting shoulder is provided with at least two splicing holes, and the distance between two adjacent splicing holes is equal.

[0044] In this solution, the connecting shoulder is evenly stressed and is not easily damaged during long-term use.

[0045] Preferably, the outer tube body includes a side wall arranged along the diameter direction of the core tube, the side wall is provided with a groove body recessed into the outer tube body, the groove body is arranged along the length direction of the outer tube body, and the cross-sectional shape of the groove body is semicircular.

[0046] In this solution, the slot body not only serves as a heat dissipation function, allowing the heat inside the power pipe to be dissipated in a timely manner, but also facilitates the removal of part of the outer pipe body by operating the slot body, making the outer pipe body easier to replace and the power pipe easier to maintain.

[0047] Preferably, the side wall of the outer tube body is provided with a heat sink, and the heat sink is bonded to the side wall of the outer tube body.

[0048] In this solution, by providing a heat sink, the heat dissipation efficiency of the power tube can be further improved.

[0049] Compared with the prior art, the power pipe construction method provided by the present invention has the following advantages:

[0050] The above construction method can effectively improve the strength of the tunnel after backfilling. During long-term use, the tunnel is not easily damaged and has high compressive strength. This makes the tunnel less prone to damage, and further makes the power pipes less prone to damage.

[0051] The upper and lower protective tubes are designed to protect the power pipes. The upper and lower protective tubes work together, allowing the upper tube to be removed independently, making installation and operation very convenient. Furthermore, during later maintenance, the upper tube can be easily removed to access the power pipes.

[0052] The stone layer can effectively disperse the force exerted on the tunnel, thereby protecting the power pipes, which are not easily damaged.

[0053] In actual use, a portion of the outer tube is first assembled with the core tube. The outer tube, which is then assembled to the core tube, is then positioned below the core tube. The remaining outer tube is then assembled to the core tube to complete the assembly of the power tube. The cable is then assembled into the space on the power tube using conventional cable assembly methods, completing the cable installation.

[0054] The power tube consists of an outer tube body and a core tube. The outer tube body is fixed to the core tube via positioning ribs. Therefore, if the outer tube body or core tube is partially damaged, the power tube can be easily disassembled and only the damaged part can be replaced, without having to replace the entire power tube. This reduces the maintenance and operating costs of the power tube.

[0055] By providing an inner flame retardant tube and an outer flame retardant tube, a fire in the cable inside the outer tube body or the core tube will not affect other parts of the power tube. In other words, damage to a local cable inside the power tube will not damage the entire power tube, but only cause local damage to the power tube. Therefore, when maintaining the power tube, only part of the power tube needs to be replaced, further reducing the use and maintenance costs of the power tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] For the purpose of explanation, several embodiments of the present invention are described in the following figures. The following figures are incorporated into this document and constitute a part of the detailed description. In some cases, well-known structures and components are shown in block diagram form to avoid obscuring the concepts of the present invention.

[0057] Figure 1 This is a cross-sectional view of the power pipe after construction is completed.

[0058] Figure 2 This is the axonometric drawing of the power pipe from the first angle.

[0059] Figure 3 This is the axonometric drawing of the power pipe from the second angle.

[0060] Figure 4 This is the axonometric view of the outer tube at the first angle.

[0061] Figure 5 This is the axonometric view of the outer tube at the second angle.

[0062] Figure 6 This is an axonometric view of the core tube.

[0063] Figure 7 This is a cross-sectional view of the inner flame retardant tube.

[0064] Figure 8 This is a schematic diagram of the flame-retardant inner wall after it is unfolded.

[0065] In the picture:

[0066] 1. Core tube, 11. Positioning edge, 12. Inner flame retardant tube.

[0067] 2. Outer tube assembly, 21. Outer tube body, 22. Positioning groove, 23. Outer flame retardant tube, 24. Connecting shoulder, 241. Splicing hole, 25. Slot body, 26. Heat sink.

[0068] 31. Heat-insulating outer wall, 32. Flame-retardant inner wall, 33. Flame-retardant sand, 34. Vertical stripes, 35. Horizontal stripes, 31. Heat-insulating outer wall, 32. Flame-retardant inner wall, 33. Flame-retardant sand, 34. Vertical stripes, 35. Horizontal stripes.

[0069] 4. Concrete support layer.

[0070] 5. Concrete anti-slip layer, 51. Step structure.

[0071] 6. Stone layer.

[0072] 71. Lower guard tube, 72. Upper guard tube, 721. Extended shoulder.

[0073] 8. Protective layer.

[0074] 9. Backfill layer. DETAILED DESCRIPTION

[0075] The specific embodiment shown below is intended to be a description of the various configurations of the subject technology of the present invention, and is not intended to represent that the subject technology of the present invention can be put into practice. The specific embodiment includes that specific details are intended to provide a thorough understanding of the subject technology of the present invention. However, it will be clear and apparent to those skilled in the art that the subject technology of the present invention is not limited to the specific details shown herein, and can be put into practice without these specific details.

[0076] Reference Figures 1 to 8 As shown, a method for constructing power pipes is provided, wherein a tunnel is excavated at a target location according to the direction of the cable. The depth of the tunnel is not less than twice the maximum outer diameter of the power pipe installed in the tunnel. The tunnel includes a bottom wall and side walls, the side walls are inclined relative to the bottom wall, and the cross-section of the tunnel is a trapezoidal shape that is wide at the top and narrow at the bottom.

[0077] Casting a concrete support layer 4 on the bottom wall of the tunnel, the thickness of the concrete support layer 4 is not less than 10 cm, and casting a concrete anti-slip layer 5 on the side wall at the same time as casting the concrete support layer 4, the thickness of the concrete anti-slip layer 5 is not less than the thickness of the concrete support layer 4;

[0078] Before the concrete support layer 4 solidifies, drain outlets are provided on the concrete support layer 4, and the drain outlets are evenly distributed on the concrete support layer 4;

[0079] After the concrete support layer 4 and the concrete anti-slip layer 5 solidify, the tunnel is filled with a stone layer 6, the thickness of which is not less than 1 / 3 of the depth of the tunnel;

[0080] A lower protective pipe 71 is laid on the stone layer 6. The cross-section of the lower protective pipe 71 is semicircular and has a lower concave cavity.

[0081] An electric power pipe is laid in the lower concave cavity, and the electric power pipe includes a core pipe 1 and an outer pipe assembly 2 arranged outside the core pipe 1. The outer pipe assembly 2 includes an outer pipe body 21 arranged along the axial direction of the core pipe 1. There are at least two outer pipe bodies 21, and at least two outer pipe bodies 21 are evenly distributed around the circumference of the core pipe 1. The core pipe 1 is provided with a positioning rib 11 for positioning the outer pipe body 21 and having elastic deformation ability. The positioning rib 11 and the core pipe 1 are an integral structure, and the positioning rib 11 is arranged along the axial direction of the core pipe 1. The outer pipe The body 21 is provided with a positioning groove 22 that cooperates with the positioning rib 11. Each of the outer tube bodies 21 is positioned by at least two of the positioning ribs 11. An inner flame retardant tube 12 is provided in the core tube 1. There is at least one inner flame retardant tube 12, and the inner flame retardant tubes 12 are independently provided. The outer tube body 21 is provided with an outer flame retardant tube 23. Each of the outer tube bodies 21 is provided with at least one outer flame retardant tube 23. The flame retardant tubes located in the same outer tube body 21 are independently provided. The outer flame retardant tube 23 and the inner flame retardant tube 12 both form a space for passing cables.

[0082] After the power pipe is laid, the cable is laid inside the power pipe. After the cable is laid, the cable is tested until it meets the use requirements;

[0083] Backfill the tunnel with a stone layer 6 so that the upper side of the stone layer 6 is flush with the upper side of the lower protective pipe 71, and lay an upper protective pipe 72 in the tunnel. The upper protective pipe 72 has a semicircular cross-section and an upper concave cavity. A portion of the power pipe is located in the upper concave cavity. The upper protective pipe 72 does not contact the lower protective pipe 71, but contacts the concrete anti-slip layer 5.

[0084] Backfill the tunnel with a stone layer 6 again, and ensure that the distance between the upper side of the stone layer 6 and the outer wall of the upper protective pipe 72 is not less than 30 cm;

[0085] A protective layer 8 is laid on the upper side of the stone layer 6, and the protective layer 8 contacts the concrete anti-slip layer 5;

[0086] Soil is backfilled on the upper side of the protective layer 8 to form a backfill layer 9, and the upper side surface of the backfill layer 9 is flush with the top surface of the tunnel.

[0087] The function of the concrete anti-slip layer 5 is to prevent the sidewall of the tunnel from sliding.

[0088] In some embodiments, the concrete anti-slip layer 5 is provided with a step structure 51 , and there are at least two step structures 51 , wherein the upper protective pipe 72 and the protective layer 8 respectively conflict with different step structures 51 .

[0089] The upper protective pipe 72 and the lower protective pipe 71 are both made of reinforced concrete, wherein the upper protective pipe 72 is provided with an extended shoulder 721 in contact with the concrete anti-slip layer 5, the extended shoulder 721 and the upper protective pipe 72 are an integrated structure, and the extended shoulder 721 is horizontally arranged.

[0090] The protective layer 8 is made of reinforced concrete, the thickness of the protective layer 8 is not less than 10 cm, and the cross-section of the protective layer 8 is arc-shaped.

[0091] There is no limit on the number of inner flame-retardant tubes 12 provided in the core tube 1 and the number of outer flame-retardant tubes 23 provided in the outer tube body 21 , and they should be reasonably selected according to the number of cables.

[0092] The outer tubes 21 and core tube 1 are made of materials similar to those of conventional art. The greater the number of outer tubes 21, the fewer parts that require replacement during maintenance. Therefore, the number of outer tubes 21 should be appropriately configured based on usage and assembly requirements. Generally, the greater the number of outer tubes 21, the more difficult it is to assemble the outer tubes 21 and core tube 1. The figure shows six outer tubes 21.

[0093] In some embodiments, the inner flame retardant tube 12 and the outer flame retardant tube 23 both include an insulating outer wall 31 and a flame retardant inner wall 32, a flame retardant space is formed between the insulating outer wall 31 and the flame retardant inner wall 32, the flame retardant space is filled with flame retardant sand 33, and both ends of the flame retardant space are closed by the insulating outer wall 31.

[0094] The flame-retardant inner wall 32 is bonded to the heat-insulating outer wall 31 , and the flame-retardant inner wall 32 is in contact with the cables disposed in the space.

[0095] The flame retardant inner wall 32 includes a flame retardant film and a flammable strip arranged on the flame retardant film. The width of the flammable strip is not greater than 1 / 5 of the width of the flame retardant inner wall 32. The flame retardant film and the flammable strip are bonded together.

[0096] The flammable strips include horizontal strips 35 arranged axially along the flame-retardant inner wall 32 and vertical strips 34 arranged circumferentially along the flame-retardant inner wall 32 . The horizontal strips 35 are evenly arranged along the circumferential direction of the flame-retardant inner wall 32 , and the vertical strips 34 are evenly arranged along the axial direction of the flame-retardant inner wall 32 .

[0097] The flammable strip can be made of wood chips or paper scraps, and it is not suitable to produce open flames during the combustion process. The main function of the flammable strip is to quickly destroy the cable after fire so that the flame retardant sand 33 can be quickly discharged.

[0098] In some embodiments, the cross-sectional shape of the positioning rib 11 is an arc shape larger than 1 / 2 of a circle, the positioning rib 11 is bonded to the core tube, and the positioning rib 11 is evenly arranged along the circumference of the core tube.

[0099] In some embodiments, both ends of the outer tube body 21 are provided with connecting shoulders 24 for facilitating the connection of the power pipe. The connecting shoulders 24 and the outer tube body 21 are an integral structure, and the connecting shoulders 24 are provided with splicing holes 241 .

[0100] The connecting shoulder 24 protrudes from the outer side wall of the outer tube body 21 . The connecting shoulder 24 is provided with at least two splicing holes 241 , and the distance between two adjacent splicing holes 241 is equal.

[0101] In some embodiments, the outer tube body 21 includes a side wall arranged along the diameter direction of the core tube, and the side wall is provided with a groove body 25 recessed into the outer tube body 21. The groove body 25 is arranged along the length direction of the outer tube body 21, and the cross-sectional shape of the groove body 25 is semicircular.

[0102] The sidewalls of the outer tube body 21 are provided with heat sinks 26, which are bonded to the sidewalls of the outer tube body 21. The heat sinks 26 can be made of metal. Metal heat sinks 26 can rapidly dissipate heat and increase the strength of the outer tube body 21, thereby increasing the strength of the power tube.

[0103] The above describes the subject technical solution and corresponding details of the present invention. It can be understood that the above description is only some implementation plans of the subject technical solution of the present invention, and some details may be omitted during its specific implementation.

[0104] In addition, in some embodiments of the above invention, multiple embodiments may be implemented in combination. Due to space limitations, various combination schemes are not listed one by one. Those skilled in the art can freely combine and implement the above embodiments as needed in specific implementation to obtain a better application experience.

[0105] When implementing the subject technical solution of the present invention, those skilled in the art can obtain other detailed configurations or drawings based on the subject technical solution of the present invention and the drawings. Obviously, these details still fall within the scope covered by the subject technical solution of the present invention without departing from the subject technical solution of the present invention.

Claims

1. A method for constructing a power pipe, characterized by: According to the cable route, a tunnel is excavated at the target location. The depth of the tunnel is not less than twice the maximum outer diameter of the power pipe installed in the tunnel. The tunnel includes a bottom wall and side walls. The side walls are inclined relative to the bottom wall. The cross-section of the tunnel is a trapezoidal shape that is wide at the top and narrow at the bottom. Casting a concrete support layer (4) on the bottom wall of the tunnel, wherein the thickness of the concrete support layer (4) is not less than 10 centimeters, and simultaneously casting a concrete anti-slip layer (5) on the side wall when casting the concrete support layer (4), wherein the thickness of the concrete anti-slip layer (5) is not less than the thickness of the concrete support layer (4); Before the concrete support layer (4) solidifies, drain outlets are provided on the concrete support layer (4), and the drain outlets are evenly distributed on the concrete support layer (4); After the concrete support layer (4) and the concrete anti-slip layer (5) solidify, a stone layer (6) is filled into the tunnel, and the thickness of the stone layer (6) is not less than 1 / 3 of the depth of the tunnel; Laying a lower protective pipe (71) on the stone layer (6), wherein the cross-section of the lower protective pipe (71) is semicircular and has a lower concave cavity; An electric power pipe is laid in the lower concave cavity, the electric power pipe comprises a core pipe (1) and an outer pipe assembly (2) arranged outside the core pipe (1), the outer pipe assembly (2) comprises an outer pipe body (21) arranged along the axial direction of the core pipe (1), there are at least two outer pipe bodies (21), at least two outer pipe bodies (21) are evenly distributed around the circumference of the core pipe (1), the core pipe (1) is provided with a positioning rib (11) for positioning the outer pipe body (21) and having elastic deformation capability, the positioning rib (11) and the core pipe (1) are an integrated structure, and the positioning rib (11) is arranged along the axial direction of the core pipe (1), the outer pipe The body (21) is provided with a positioning groove (22) matched with the positioning rib (11), each of the outer tube bodies (21) is positioned by at least two of the positioning ribs (11), an inner flame retardant tube (12) is provided in the core tube (1), there is at least one inner flame retardant tube (12), and the inner flame retardant tubes (12) are independently arranged, the outer tube body (21) is provided with an outer flame retardant tube (23), each of the outer tube bodies (21) is provided with at least one outer flame retardant tube (23), the flame retardant tubes located in the same outer tube body (21) are independently arranged, and the outer flame retardant tube (23) and the inner flame retardant tube (12) both form a space for passing cables; After the power pipe is laid, the cable is laid inside the power pipe. After the cable is laid, the cable is tested until it meets the use requirements; Backfilling the tunnel with a stone layer (6) so that the upper side of the stone layer (6) is flush with the upper side of the lower protective pipe (71), and laying an upper protective pipe (72) in the tunnel, wherein the cross-section of the upper protective pipe (72) is semicircular, the upper protective pipe (72) has an upper concave cavity, a portion of the power pipe is located in the upper concave cavity, the upper protective pipe (72) does not contact the lower protective pipe (71), and the upper protective pipe (72) abuts against the concrete anti-slip layer (5); Backfill the tunnel with a stone layer (6) again, and ensure that the distance between the upper side of the stone layer (6) and the outer wall of the upper protective pipe (72) is not less than 30 cm; A protective layer (8) is laid on the upper side of the stone layer (6), wherein the protective layer (8) contacts the concrete anti-slip layer (5); Soil is backfilled on the upper side of the protective layer (8) to form a backfill layer (9), and the upper side surface of the backfill layer (9) is flush with the top surface of the tunnel.

2. The power pipe construction method according to claim 1, characterized in that: The concrete anti-slip layer (5) is provided with a step structure (51), and there are at least two step structures (51), wherein the upper protective pipe (72) and the protective layer (8) respectively conflict with different step structures (51).

3. The power pipe construction method according to claim 1, characterized in that: The upper protective pipe (72) and the lower protective pipe (71) are both made of reinforced concrete, wherein the upper protective pipe (72) is provided with an extended shoulder (721) in contact with the concrete anti-slip layer (5), the extended shoulder (721) and the upper protective pipe (72) are an integrated structure, and the extended shoulder (721) is horizontally arranged.

4. The power pipe construction method according to claim 1, characterized in that: The protective layer (8) is made of reinforced concrete, the thickness of the protective layer (8) is not less than 10 centimeters, and the cross-section of the protective layer (8) is arc-shaped.

5. The power pipe construction method according to claim 1, characterized in that: The inner flame-retardant cylinder (12) and the outer flame-retardant cylinder (23) both comprise a heat-insulating outer wall (31) and a flame-retardant inner wall (32); a flame-retardant space is formed between the heat-insulating outer wall (31) and the flame-retardant inner wall (32); the flame-retardant space is filled with flame-retardant sand (33); and both ends of the flame-retardant space are closed by the heat-insulating outer wall (31); The flame-retardant inner wall (32) is bonded to the heat-insulating outer wall (31), and the flame-retardant inner wall (32) is in contact with the cables arranged in the space; The flame retardant inner wall (32) comprises a flame retardant film and a flammable strip arranged on the flame retardant film, the width of the flammable strip is not greater than 1 / 5 of the width of the flame retardant inner wall (32), and the flame retardant film and the flammable strip are bonded together; The flammable strips include horizontal strips (35) arranged axially along the flame-retardant inner wall (32) and vertical strips (34) arranged circumferentially along the flame-retardant inner wall (32), wherein the horizontal strips (35) are evenly arranged along the circumferential direction of the flame-retardant inner wall (32), and the vertical strips (34) are evenly arranged along the axial direction of the flame-retardant inner wall (32).

6. The power pipe construction method according to claim 5, characterized in that: The cross-sectional shape of the positioning rib (11) is an arc shape larger than 1 / 2 of a circle, the positioning rib (11) is bonded to the core tube, and the positioning rib (11) is evenly arranged along the circumference of the core tube.

7. The power pipe construction method according to claim 5, characterized in that: Both ends of the outer tube body (21) are provided with connection shoulders (24) for facilitating connection with the power pipe. The connection shoulders (24) and the outer tube body (21) are an integrated structure, and the connection shoulders (24) are provided with splicing holes (241).

8. The power pipe construction method according to claim 7, characterized in that: The connecting shoulder (24) protrudes from the outer side wall of the outer tube body (21), and the connecting shoulder (24) is provided with at least two splicing holes (241), and the distance between two adjacent splicing holes (241) is equal.

9. The power pipe construction method according to claim 5, characterized in that: The outer tube body (21) comprises a side wall arranged along the diameter direction of the core tube, the side wall being provided with a groove body (25) recessed into the outer tube body (21), the groove body (25) being arranged along the length direction of the outer tube body (21), and the cross-sectional shape of the groove body is semicircular.

10. The power pipe construction method according to claim 9, characterized in that: The side wall of the outer tube body (21) is provided with a heat sink (26), and the heat sink (26) is bonded to the side wall of the outer tube body (21).

Images