Buried power cable protection pipe

Abstract

The invention discloses a buried power cable protection tube, which comprises a tube body and an end tube located at the end of the tube body, and is characterized in that the tube body comprises an outer braid layer, a middle layer and an inner braid layer; the end tube includes an insertion tube located between the intermediate layer and the outer braid layer, an extension tube, and a flexible surrounding tube surrounding an end of the outer braid layer. According to the power cable protection pipe, due to the fact that the end part pipe is arranged at the end part, connection and supporting installation of adjacent power cable protection pipes are facilitated, and the installation efficiency is improved. And by arranging the connecting part, the two power cable protection pipes are connected more stably. And when subsequent maintenance is needed, the connecting part can be opened, so that the internal cable condition can be conveniently observed. By arranging the fixed seat part, on one hand, the installation of the power cable protection pipe is facilitated, and on the other hand, the sinking of the power cable protection pipe can be detected.

Description

Technical Field

[0001] The present invention relates to the technical field of cable protection tubes, and more specifically, to an underground power cable protection tube. Background Art

[0002] BWFRP pipe, also known as BWFRP cable protection sleeve, is widely used to replace traditional PVC pipe and PE pipe due to its outstanding performance in ring stiffness, tensile strength, impact resistance, corrosion resistance and other aspects. It is used in municipal engineering, urban power grid, rail transit, etc.

[0003] BWFRP pipes have a certain flexibility, which has certain advantages on the one hand. On the other hand, in some cases, when two BWFRP pipes are connected, the connection rigidity of the ends is poor, which is not convenient for the installation of BWFRP pipes and increases the difficulty of the installation process. In addition, some connections are made through connecting pipes. However, when this method requires maintenance in the later stage, it is not convenient to open the connecting pipe and observe the internal cable conditions. In addition, after the BWFRP pipe is used for a long time, due to reasons such as roadbed settlement and cable gravity, the cable protection pipe may sink. However, since the cable protection pipe is buried underground, the sinking phenomenon cannot be detected in time, and maintenance cannot be carried out in time. Summary of the invention

[0004] The present invention aims to overcome the defects of the prior art and provide an underground power cable protection tube.

[0005] In order to achieve the above-mentioned objectives, the present invention provides the following technical solutions: a cable protection tube, comprising a tube body and an end tube located at the end of the tube body, the tube body comprising an outer braided layer, an inner braided layer and an intermediate layer located between the outer braided layer and the inner braided layer; the end tube comprising an insertion tube, an extension tube connected to the insertion tube and a flexible surrounding tube connected to the extension tube, the insertion tube being located between the intermediate layer and the outer braided layer, and the flexible surrounding tube surrounding the end of the outer braided layer.

[0006] Furthermore, there is a glue layer between the outer braided layer and the insertion tube.

[0007] Furthermore, both ends of the tube body are provided with the end tubes.

[0008] Furthermore, the flexible surrounding tube is made of rubber material.

[0009] Furthermore, the insertion tube and the extension tube are made of PVC material.

[0010] Furthermore, the power cable protection tube is a BWFRP tube.

[0011] The present application also discloses a cable protection tube, comprising two protection tube bodies and a connecting portion connecting the two protection tube bodies; the protection tube body comprises a tube body and an end tube located at the end of the tube body, the tube body comprises an outer braided layer, an inner braided layer and an intermediate layer located between the outer braided layer and the inner braided layer; the end tube comprises an insertion tube, an extension tube connected to the insertion tube and a flexible surrounding tube connected to the extension tube, the insertion tube is located between the intermediate layer and the outer braided layer, the flexible surrounding tube surrounds the end of the outer braided layer, and the flexible surrounding tube has a plurality of first annular protrusions; the connecting portion comprises a first connecting unit, a wrapping unit, two second connecting units, two insertion locking units and a plurality of fixing tubes; the first connecting unit comprises a first tube portion and two first annular flanges fixedly connected to the first tube portion, the first tube portion has a first strip opening running through the entire length of the first tube portion, the first tube portion has two circles of arc-shaped insertion channels, the openings at both ends of the arc-shaped insertion channel are located one at the end of the first tube portion, and the other Located between two first annular flanges; the second connecting unit includes a second tube portion and a second annular flange fixedly connected to the second tube portion, the second annular flange has an annular groove, the second tube portion surrounds the flexible surrounding tube, and the inner side of the second tube portion has a plurality of second annular protrusions; the insertion locking unit includes a plurality of arc-shaped insertion rods that can be inserted into the arc-shaped insertion channel; the wrapping unit includes a third tube portion, a plurality of studs connected to the third tube portion, a third annular flange located on the inner side wall of the third tube portion, and two fourth annular flanges located on the inner side wall of the third tube portion, the wrapping unit has a second strip opening, the second strip opening extends in the entire length direction of the third tube portion, and the second strip opening passes through the third annular flange, two fourth annular flanges and a plurality of studs, the third annular flange is located between the two first annular flanges, and the two fourth annular flanges are respectively located in the annular grooves of the two second connecting units; the fixing tube has an internal thread that cooperates with the stud, and each stud has one fixing tube.

[0012] Furthermore, there is a glue layer between the outer braided layer and the insertion tube.

[0013] Furthermore, both ends of the first tube portion have chamfers.

[0014] This makes it easier to thread the cable.

[0015] Furthermore, the first tube portion can be opened along the first strip-shaped opening.

[0016] Furthermore, the third tube portion can be opened along the second strip-shaped opening.

[0017] Therefore, during later maintenance, the first pipe part and the third pipe part can be opened to view the internal cable conditions.

[0018] Furthermore, one end of the arc-shaped insertion rod is connected to an abutment block that can be abutted and squeezed by the third annular flange, and the other end has a semi-cylindrical protrusion that can abut against the inner wall of the extension tube.

[0019] Therefore, the arc-shaped insertion rod has a better abutment and limiting effect.

[0020] Furthermore, the inner side of the extension tube has a raised annular limiting portion, and the arc-shaped insertion rod spans the annular limiting portion.

[0021] Therefore, the annular limiting portion plays a limiting role on the arc-shaped insertion rod.

[0022] Furthermore, the insertion locking unit further comprises an arc-shaped connecting rod, and the arc-shaped connecting rod is fixedly connected to all the arc-shaped insertion rods.

[0023] Thus, the plurality of arc-shaped connecting rods are formed into a whole, and the arc-shaped connecting rods have certain flexibility, which facilitates the insertion operation of the arc-shaped insertion rods.

[0024] Furthermore, it also includes a fixed seat portion, which includes an upper fixed seat and a lower fixed seat, the connecting portion is clamped between the upper fixed seat and the lower fixed seat, the upper fixed seat has an upper semi-cylindrical accommodating groove, and the lower fixed seat has a lower semi-cylindrical accommodating groove.

[0025] Thereby providing good support for the cables.

[0026] Furthermore, the lower semi-cylindrical accommodating groove has a support pad seat, the connecting part has three fixed cylinders, namely a first fixed cylinder and two second fixed cylinders located on both sides of the first fixed cylinder, the support pad has a positioning hole that cooperates with the first fixed cylinder, the lower semi-cylindrical accommodating groove has two strip grooves that respectively cooperate with the two second fixed cylinders, the bottom end of the strip groove has a pressure sensor, the bottom end of the second fixed cylinder is inserted into the strip groove, and the bottom end does not contact the pressure sensor.

[0027] Thereby, the sinking of the power cable protection tube can be detected, so that maintenance can be carried out as needed.

[0028] Furthermore, the upper fixing seat and the lower fixing seat each have two first strip grooves, two second strip grooves and two strip channels, the first strip grooves have a plurality of first mounting through holes, the second strip grooves have a plurality of second mounting through holes, and the strip channels have a plurality of mounting through grooves.

[0029] Therefore, it can be combined and fixed with other fixing seats to form a plurality of power cable protection tubes arranged in an array.

[0030] Furthermore, the lower semi-cylindrical containing groove is provided with a liquid leakage hole.

[0031] Furthermore, the arc-shaped insertion rod and the arc-shaped connecting rod are both made of plastic.

[0032] Furthermore, the insertion and locking unit has 8 arc-shaped insertion rods; the first connection unit has 16 arc-shaped insertion channels, which are divided into two circles, and the 8 arc-shaped insertion channels in each circle are distributed in a circular shape with equal intervals.

[0033] Furthermore, the insertion tube and the extension tube are made of PVC material.

[0034] Furthermore, the power cable protection tube is a BWFRP tube.

[0035] Beneficial effects:

[0036] 1. The power cable protection tube of the present application is provided with an end tube at the end, thereby facilitating the connection and support installation of adjacent power cable protection tubes, thereby improving installation efficiency.

[0037] 2. The power cable protection tube of the present application is provided with a connection part, so that the connection between the two power cable protection tubes is more stable. And when maintenance is required later, the connection part can be opened, so as to facilitate observation of the internal cable conditions.

[0038] 3. The power cable protection tube of the present application is provided with a fixed seat, which, on the one hand, facilitates the installation of the power cable protection tube, and on the other hand, can realize the detection of the sinking of the power cable protection tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of a power cable protection tube according to Example 1;

[0040] Figure 2 This is a cross-sectional schematic diagram of the power cable protection tube of Example 1;

[0041] Figure 3 It is a schematic diagram of the process of turning over the flexible surrounding tube of Example 1 to cover the end of the outer braided layer;

[0042] Figure 4 This is a schematic diagram of component separation of Example 2;

[0043] Figure 5 This is an enlarged view of area 1A;

[0044] Figure 6 A schematic diagram of installing a second connection unit on two protection tube bodies of Example 2;

[0045] Figure 7 This is an enlarged view of area 2A;

[0046] Figure 8 A schematic diagram of a first connection unit installed between two protection tube bodies of Example 2, and two insertion locking units installed;

[0047] Fig. 9 This is an enlarged view of the 3A area;

[0048] Fig.10 A schematic diagram of a wrapping unit is installed for Example 2;

[0049] Fig.11 A schematic diagram of a fixed cylinder is shown for Example 2;

[0050] Fig.12 This is a schematic diagram of Example 3 before the fixed seat is installed;

[0051] Fig.13 This is an enlarged view of area 4A;

[0052] Fig.14 Schematic diagram of the fixed seat installed in Example 3.

[0053] Explanation of the reference numerals: outer braided layer 1; inner braided layer 2; middle layer 3; insertion tube 4; extension tube 5; annular limiting portion 5.1; flexible surrounding tube 6; first annular protrusion 6.1; first connecting unit 7; first tube portion 7.1; first annular flange 7.2; first strip opening 7.3; arc-shaped insertion channel 7.4; second connecting unit 8; second tube portion 8.1; second annular flange 8.2; annular groove 8.3; second annular protrusion 8.4; insertion locking unit 9; arc-shaped insertion rod 9.1; abutment block 9.2; semi-cylindrical protrusion 9.3; arc-shaped connecting rod 9.4; wrapping unit 10; third tube portion 10 .1; stud 10.2; third annular flange 10.3; fourth annular flange 10.4; second strip opening 10.5; fixing cylinder 11; first fixing cylinder 11.1; second fixing cylinder 11.2; upper fixing seat 12; upper semi-cylindrical receiving groove 12.1; lower fixing seat 13; lower semi-cylindrical receiving groove 13.1; first strip groove 13.2; second strip groove 13.3; strip channel 13.4; first mounting through hole 13.5; second mounting through hole 13.6; mounting through groove 13.7; leakage hole 13.8; supporting pad 13.9; positioning socket 13.10; strip groove 13.11. DETAILED DESCRIPTION

[0054] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0055] Example 1

[0056] Embodiment 1 discloses a buried power cable protection tube, comprising a tube body and an end tube located at the end of the tube body, wherein the tube body comprises an outer braided layer 1, an inner braided layer 2, and an intermediate layer 3 located between the outer braided layer 1 and the inner braided layer 2; the end tube comprises an insertion tube 4, an extension tube 5 connected to the insertion tube 4, and a flexible surrounding tube 6 connected to the extension tube 5, wherein the insertion tube 4 is located between the intermediate layer 3 and the outer braided layer 1, and the flexible surrounding tube 6 surrounds the end of the outer braided layer 1. Both ends of the tube body have the end tubes; the flexible surrounding tube 6 is made of rubber material. The insertion tube 4 and the extension tube 5 are made of PVC material. The power cable protection tube is a BWFRP tube.

[0057] The power cable protection tube of Example 1 is manufactured by installing the end tubes at both ends of the cable, thereby utilizing the characteristics of the harder material of the end tubes. When the two cable protection tubes are connected by a connecting tube, or when the ends of the power cable protection tubes are installed and supported by a support frame, better rigidity can be provided, thereby making it more convenient to support and connect the power cable protection tube. During manufacturing, it is only necessary to put on the insertion tube after the middle layer of the end of the power cable protection tube is made, and then apply glue on the insertion tube, and then connect and fix the outer braided layer to the insertion tube. The flexible surrounding tube is made of rubber material and has elasticity. When the insertion tube is inserted, the flexible surrounding tube surrounds and covers the extension tube. After the insertion tube and the outer braided layer are fixedly connected, the flexible surrounding tube is turned over to cover the end of the outer braided layer, thereby forming the power cable protection tube of Example 1.

[0058] Example 2

[0059] Embodiment 2 discloses a buried power cable protection tube, comprising two protection tube bodies and a connection portion connecting the two protection tube bodies; the protection tube body comprises a tube body and an end tube located at the end of the tube body, the tube body comprises an outer braided layer 1, an inner braided layer 2 and an intermediate layer 3 located between the outer braided layer 1 and the inner braided layer 2; the end tube comprises an insertion tube 4, an extension tube 5 connected to the insertion tube 4 and a flexible surrounding tube 6 connected to the extension tube 5, the insertion tube 4 is located between the intermediate layer 3 and the outer braided layer 1, the flexible surrounding tube 6 surrounds the end of the outer braided layer 1, and the flexible surrounding tube 6 has a plurality of first annular protrusions 6.1; the connection The connecting part includes a first connecting unit 7, a wrapping unit 10, two second connecting units 8, two inserting and locking units 9 and a plurality of fixing tubes 11; the first connecting unit 7 includes a first tube portion 7.1 and two first annular flanges 7.2 fixedly connected to the first tube portion 7.1, the first tube portion 7.1 has a first strip opening 7.3 that runs through the entire length of the first tube portion 7.1, the first tube portion 7.1 has two circles of arc-shaped insertion channels 7.4, and the openings at both ends of the arc-shaped insertion channels 7.4 are located at the end of the first tube portion 7.1 and the other is located between the two first annular flanges 7.2; the second connecting unit 8 includes a second tube portion 7.1 and a second annular flange 7.2 that is fixedly connected to the first tube portion 7.1; the first tube portion 7.1 has a first strip opening 7.3 that runs through the entire length of the first tube portion 7.1, the first tube portion 7.1 has two circles of arc-shaped insertion channels 7.4, and one opening at each end of the arc-shaped insertion channel 7.4 is located at the end of the first tube portion 7.1 and the other is located between the two first annular flanges 7.2; the second connecting unit 8 includes a second tube portion The second tube portion 8.1 and a second annular flange 8.2 fixedly connected to the second tube portion 8.1, the second annular flange 8.2 has an annular groove 8.3, the second tube portion 8.1 surrounds the flexible surrounding tube 6, and the inner side of the second tube portion 8.1 has a plurality of second annular protrusions 8.4; the insertion locking unit 9 includes a plurality of arc-shaped insertion rods 9.1 that can be inserted into the arc-shaped insertion channel 7.4; the wrapping unit 10 includes a third tube portion 10.1, a plurality of studs 10.2 connected to the third tube portion 10.1, a third annular flange 10.3 located on the inner side wall of the third tube portion 10.1, and two fourth An annular flange 10.4, the wrapping unit 10 has a second strip opening 10.5, the second strip opening 10.5 extends in the entire length direction of the third tube portion 10.1, and the second strip opening 10.5 passes through the third annular flange 10.3, two fourth annular flanges 10.4 and a plurality of studs 10.2, the third annular flange 10.3 is located between the two first annular flanges 7.2, and the two fourth annular flanges 10.4 are respectively located in the annular grooves 8.3 of the two second connecting units 8; the fixing cylinder 11 has an internal thread that cooperates with the stud 10.2, and each stud 10.2 has a fixing cylinder 11.

[0060] One end of the arc-shaped insertion rod 9.1 is connected with an abutment block 9.2 that can be abutted and squeezed by the third annular flange 10.3, and the other end has a semi-cylindrical protrusion 9.3 that can abut the inner wall of the extension tube 5; the inner side of the extension tube 5 has a protruding annular limit portion 5.1, and the arc-shaped insertion rod 9.1 spans the annular limit portion 5.1; the insertion and locking unit 9 also includes an arc-shaped connecting rod 9.4, and the arc-shaped connecting rod 9.4 is fixedly connected to all the arc-shaped insertion rods 9.1. The arc-shaped insertion rod 9.1 and the arc-shaped connecting rod 9.4 are both made of plastic. The insertion and locking unit 9 has 8 arc-shaped insertion rods 9.1; the first connection unit 7 has 16 arc-shaped insertion channels 7.4, which are divided into two circles, and the 8 arc-shaped insertion channels 7.4 in each circle are distributed in an annular manner with equal spacing. The insertion tube 4 and the extension tube 5 are made of PVC material. The power cable protection tube is a BWFRP tube.

[0061] In Example 2, a connecting portion is added on the basis of Example 1 to achieve the connection between two power cable protection tubes. Figure 4 As shown in FIG. 1 , first, each component is in a separate state. Then, as shown in FIG. Figure 6 As shown, the two second connection units are respectively sleeved on the two end tubes, and then the second tube portion is matched with the flexible surrounding tube, so that the area with multiple first annular protrusions and the area with multiple second annular protrusions face each other, so that the second connection tube and the end tube can be better matched. Figure 8 As shown, insert the two ends of the first tube portion of the first connecting unit into the two end tubes respectively, and insert the two insertion locking units. Fig.10 As shown, the wrapping unit is wrapped so that the third annular flange is located between the two first annular flanges, and the two fourth annular flanges are respectively located in the annular grooves of the two second connecting units, so that due to the squeezing of the arc-shaped insertion rod by the third annular flange, the other end of the arc-shaped insertion rod abuts against the inner wall of the insertion tube, thereby fixing the insertion tube, and the wrapping unit fixes the second connecting unit, so that the connection between the two protective tube bodies and the connecting part is stable. Fig.11 As shown, the fixing cylinder is installed to lock the wrapping unit. When maintenance is required later, since the first tube has a first strip opening and the wrapping unit has a second strip opening, it is convenient to open the wrapping unit and the first tube, so as to observe and maintain the cables passing through the inside.

[0062] Example 3

[0063] The improvement of Example 3 over Example 2 is that it also includes a fixed seat portion, the fixed seat portion includes an upper fixed seat 12 and a lower fixed seat 13, the connecting portion is clamped between the upper fixed seat 12 and the lower fixed seat 13, the upper fixed seat 12 has an upper semi-cylindrical receiving groove 12.1, and the lower fixed seat 13 has a lower semi-cylindrical receiving groove 13.1. Thereby, support is formed for the connecting portion, so as to facilitate the installation of the power cable protection tube. The upper fixed seat 12 and the lower fixed seat 13 each have two first strip grooves 13.2, two second strip grooves 13.3 and two strip channels 13.4, the first strip groove 13.2 has a plurality of first mounting through holes 13.5, the second strip groove 13.3 has a plurality of second mounting through holes 13.6, and the strip channel 13.4 has a plurality of mounting through grooves 13.7; the lower semi-cylindrical receiving groove 13.1 has a leakage hole 13.8. Since the fixing seat has the first and second mounting through holes and the mounting through groove, it can be combined and fixed with other fixing seats to form a plurality of power cable protection tubes arranged in an array.

[0064] A fixed seat with only a supporting function can be installed on ordinary sections. In some sections, the cable may sink after long-term use, causing the connection positions at both ends of the cable to be subjected to greater pressure and pulling force. In order to detect these situations in time, a fixed seat with a detection function can be installed at a key position. Specifically, the lower semi-cylindrical accommodating groove 13.1 has a support cushion seat 13.9, and the connecting part has three fixed cylinders 11, namely a first fixed cylinder 11.1 and two second fixed cylinders 11.2 located on both sides of the first fixed cylinder. The support cushion seat 13.9 has a positioning socket 13.10 that cooperates with the first fixed cylinder 11.1, and the lower semi-cylindrical accommodating groove 13.1 has two strip grooves 13.11 that cooperate with the two second fixed cylinders 11.2 respectively. The bottom end of the strip groove 13.11 has a pressure sensor, and the bottom end of the second fixed cylinder 11.2 is inserted into the strip groove 13.11, and the bottom end does not contact the pressure sensor.

[0065] On one hand, the fixed seat has an upper semi-cylindrical receiving groove and a lower semi-cylindrical receiving groove, thereby providing support for the cable, and the positioning socket can be positioned and matched with a fixed cylinder in the middle. The fixed cylinders on both sides cooperate with the strip grooves. Under normal circumstances, the fixed cylinders on both sides will not press the pressure sensor. However, when the cable between the two fixed seats sinks, the two ends of the cable protection tube will also tilt downward, causing the two fixed cylinders on both sides to tilt downward. When they tilt downward to a certain degree and press on the pressure sensor, it can be sensed in time, so that the maintainer can obtain this information in time and perform maintenance as needed.

[0066] Although the present invention has been illustrated and described with respect to the preferred embodiments, it will be appreciated by those skilled in the art that various changes and modifications may be made to the present invention without departing from the scope of the present invention as defined by the claims.

Claims

1. A buried power cable protection tube, characterized in that: It includes a tube body and an end tube located at the end of the tube body, wherein the tube body includes an outer braided layer, an inner braided layer and an intermediate layer located between the outer braided layer and the inner braided layer; the end tube includes an insertion tube, an extension tube connected to the insertion tube and a flexible surrounding tube connected to the extension tube, wherein the insertion tube is located between the intermediate layer and the outer braided layer, and the flexible surrounding tube surrounds the end of the outer braided layer.

2. The buried power cable protection tube according to claim 1, characterized in that: Both ends of the tube body are provided with the end tubes; and the flexible surrounding tube is made of rubber material.

3. A buried power cable protection tube, characterized in that: The invention comprises two protective tube bodies and a connecting part connecting the two protective tube bodies; the protective tube body comprises a tube body and an end tube located at the end of the tube body, the tube body comprises an outer braided layer, an inner braided layer and an intermediate layer located between the outer braided layer and the inner braided layer; the end tube comprises an insertion tube, an extension tube connected to the insertion tube and a flexible surrounding tube connected to the extension tube, the insertion tube is located between the intermediate layer and the outer braided layer, the flexible surrounding tube surrounds the end of the outer braided layer, and the flexible surrounding tube has a plurality of first annular protrusions; the connecting part comprises a first connecting unit, a wrapping unit, two second connecting units, two insertion locking units and a plurality of fixing tubes; the first connecting unit comprises a first tube part and two first annular flanges fixedly connected to the first tube part, the first tube part has a first strip opening running through the entire length of the first tube part, the first tube part has two circles of arc-shaped insertion channels, one opening at each end of the arc-shaped insertion channel is located at the end of the first tube part, and the other opening is located at the two first rings shaped flanges; the second connecting unit includes a second tube portion and a second annular flange fixedly connected to the second tube portion, the second annular flange has an annular groove, the second tube portion surrounds the flexible surrounding tube, and the inner side of the second tube portion has a plurality of second annular protrusions; the insertion locking unit includes a plurality of arc-shaped insertion rods that can be inserted into the arc-shaped insertion channel; the wrapping unit includes a third tube portion, a plurality of studs connected to the third tube portion, a third annular flange located on the inner side wall of the third tube portion, and two fourth annular flanges located on the inner side wall of the third tube portion, the wrapping unit has a second strip opening, the second strip opening extends in the entire length direction of the third tube portion, and the second strip opening passes through the third annular flange, the two fourth annular flanges and a plurality of studs, the third annular flange is located between the two first annular flanges, and the two fourth annular flanges are respectively located in the annular grooves of the two second connecting units; the fixing tube has an internal thread that cooperates with the stud, and each stud has one fixing tube.

4. The buried power cable protection tube according to claim 3, characterized in that: One end of the arc-shaped insertion rod is connected to an abutment block that can be abutted and squeezed by the third annular flange, and the other end has a semi-cylindrical protrusion that can abut the inner wall of the extension tube; the inner side of the extension tube has a raised annular limiting portion, and the arc-shaped insertion rod spans the annular limiting portion; the insertion locking unit also includes an arc-shaped connecting rod, which is fixedly connected to all the arc-shaped insertion rods.

5. The buried power cable protection tube according to claim 3, characterized in that: It also includes a fixed seat portion, which includes an upper fixed seat and a lower fixed seat, and the connecting portion is clamped between the upper fixed seat and the lower fixed seat, the upper fixed seat has an upper semi-cylindrical accommodating groove, and the lower fixed seat has a lower semi-cylindrical accommodating groove; the lower semi-cylindrical accommodating groove has a supporting pad, and the connecting portion has three fixed cylinders, namely a first fixed cylinder and two second fixed cylinders located on both sides of the first fixed cylinder, the supporting pad has a positioning socket that cooperates with the first fixed cylinder, the lower semi-cylindrical accommodating groove has two strip grooves that cooperate with the two second fixed cylinders respectively, the bottom end of the strip groove has a pressure sensor, the bottom end of the second fixed cylinder is inserted into the strip groove, and the bottom end does not contact the pressure sensor.

6. The buried power cable protection tube according to claim 5, characterized in that: The upper fixing seat and the lower fixing seat both have two first strip grooves, two second strip grooves and two strip channels. The first strip grooves have multiple first mounting through holes, the second strip grooves have multiple second mounting through holes, and the strip channels have multiple mounting through grooves. The lower semi-cylindrical accommodating groove has a liquid leakage hole.

7. The buried power cable protection tube according to claim 3, characterized in that: The arc-shaped insertion rod and the arc-shaped connecting rod are both made of plastic.

8. The buried power cable protection tube according to claim 3, characterized in that: The insertion and locking unit has 8 arc-shaped insertion rods; the first connection unit has 16 arc-shaped insertion channels, which are divided into two circles, and the 8 arc-shaped insertion channels in each circle are distributed in a circular shape with equal spacing.

9. The buried power cable protection tube according to claim 1 or 3, characterized in that: The insertion tube and the extension tube are made of PVC material.

10. The buried power cable protection tube according to claim 1 or 3, characterized in that: The power cable protection tube is a BWFRP tube.

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