Underground pipeline protection device

Abstract

The utility model discloses an underground pipeline protection device, which relates to the technical field of underground pipelines, including a pit and a protective sleeve: a pipeline body is sleeved in the protective sleeve; a first filling slot and a second filling slot are provided at the upper and lower ends of the protective sleeve, and the connection between the first filling slot and the second filling slot is an arc mouth matching the protective sleeve; a filling port is provided at the upper end of the first filling slot, and a filling box is provided at the upper end of the filling port; baffles are fixedly connected at both ends of the fixed head. The utility model fills cement mortar into the filling box through the filling port. After the cement mortar fills the first filling slot, it flows down along the gap between the protective sleeve and the second filling slot to the second filling slot. After the cement mortar solidifies, it will form a solid protective layer covering the protective sleeve. When construction is being carried out above or shield construction is being carried out below, the protective layer can protect the protective sleeve and then the pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of underground pipelines, in particular to an underground pipeline protection device. Background Art

[0002] Municipal underground pipelines refer to water supply, drainage, gas, heat, electricity, communications, radio and television, industrial and other pipelines and their ancillary facilities within the city. They are important infrastructure and "lifelines" to ensure the operation of the city. The buried depth of the pipelines under the road should not only have a reasonable plane position, but also reasonably control the buried depth of each pipeline. For example, the buried depth of sewage pipes and rainwater pipes is generally 2.0m-2.5m.

[0003] The existing method for burying underground pipelines usually involves excavating the surface in the area where the pipelines need to be buried according to the requirements of the design drawings. The excavation depth must take into account the buried depth of the pipelines and the stability of the soil, while meeting the requirements of relevant regulations. Then the underground pipeline is sheathed in an external protective casing, and then the external protective casing is buried in the pit, and then the pit is buried with soil and compacted.

[0004] In the prior art, a Chinese patent with a publication number of CN210564532U is proposed to solve the above-mentioned technical problems. The technical solution disclosed in the patent document is as follows: comprising a grouting pipe and a grouting body arranged above the shield section; a grouting cavity is arranged in the grouting body, the grouting cavity is arranged below the pipeline, and the minimum distance between the grouting cavity and the pipeline is 0.5-1m; the cross-section of the grouting cavity along the radial direction of the pipeline is V-shaped or arc-shaped, and the grouting cavity is arranged around the pipeline; the grouting pipe comprises a grouting end and a slurry outlet end respectively arranged at both ends of the grouting pipe, the grouting end is located outside the grouting body, and the slurry outlet end is connected to the grouting cavity. The underground pipeline reinforcement structure of the utility model has the advantages of simple structure and can effectively protect the safety of underground pipelines, but the grouting cavity can only protect the bottom side of the pipeline, and its protection is not comprehensive enough. When the pipeline layout of the ground is not fully investigated or missed during the relevant construction above, it is easy to directly dig the pipeline during construction, thereby causing damage to the pipeline. Utility Model Content

[0005] The purpose of the utility model is to provide an underground pipeline protection device to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A protective device for underground pipelines, wherein a pipeline body is sleeved inside a protective sleeve; a fixed head is slidably connected to both ends of the protective sleeve; a first filling groove and a second filling groove are provided at the upper and lower ends of the protective sleeve; the connection between the first filling groove and the second filling groove is an arc mouth matching the protective sleeve; a filling port is provided at the upper end of the first filling groove, and a filling box is installed at the upper end of the filling port; the width of the arc mouth is greater than the diameter of the protective sleeve; baffles are provided on both sides of the protective sleeve, convex heads extend on both sides of the fixed head, and clamping heads extend at both ends of the baffle along the axial direction of the protective sleeve, a clamping mouth is formed between the clamping heads, the convex heads are slidably plugged into the clamping mouth, and the baffle closes both sides of the first filling groove and the second filling groove; plugs are fixedly connected to the upper and lower ends of the baffle, and a socket matching the plug is provided on the end of the first filling groove and the second filling groove that contacts the baffle.

[0008] During installation, place the pipeline body in the protective sleeve, and then slide the fixing head to install it on both ends of the protective sleeve; at the same time, place the end of the second filling tank with the larger area downward on the bottom surface, and then insert the plug on the baffle into the socket at the upper end of the second filling tank to fix the baffle and the second filling tank, and then place the protective sleeve on the upper end of the second filling tank, and slide the fixing head so that the fixing head is stuck in the socket on the baffle to limit the fixing head, and finally plug the first filling tank on top of the baffle in the same way; when in use, put the assembled components into the pit, and then bury the pit with soil, Cement mortar is poured into the filling box through the filling port, and the cement mortar enters the first filling tank from the filling port and fills the first filling tank. Because the fixing head matches the arc mouth when fixed, the protective sleeve is placed on the upper end of the second filling tank through the fixing head, and the arc mouth of the filling tank is wider than the diameter of the protective sleeve. Therefore, after the cement mortar fills the first filling tank, it flows down along the gap between the protective sleeve and the second filling tank to the second filling tank. After the cement mortar solidifies, it will form a solid protective layer covering the protective sleeve. When construction is in progress above or shield construction is underway below, the protective layer can protect the protective sleeve and then the pipeline.

[0009] A further improvement of the technical solution of the utility model is that: preferably, the cross-sections of the first filling groove and the second filling groove are trapezoidal, and the arc openings are opened at the short side ends of the trapezoid.

[0010] The above-mentioned technical scheme is adopted, in which the first filling trough and the second filling trough are set to be trapezoidal. When the soil is buried, the side walls of the first filling trough and the second filling trough are filled with soil. After the burial grouting is completed, when the pipeline stays above and is crushed by heavy objects, the inclined surface can well disperse the gravity of the heavy objects above, reduce the pressure on the protective pipe sleeve, and thereby improve the protection capability of the device.

[0011] A further improvement of the technical solution of the utility model is that the filling box is in a funnel shape which is larger at the top and smaller at the bottom, the filling box is slidably connected to the filling port, and the filling box is inserted into the filling port.

[0012] The above technical solution is adopted, in which the filling efficiency is improved by setting the filling box as a funnel, and the bottom end of the filling box is plugged into the filling port. When the filling is completed, the filling box can be taken out and the empty space can be filled with soil.

[0013] A further improvement of the technical solution of the utility model is that a zinc block is provided at the fixing head, and the zinc block is connected to the fixing head through a wire.

[0014] The above technical solution is adopted. In this solution, a zinc block is set, and the zinc block and the fixed head together form a primary battery system. In this system, the zinc block serves as the negative electrode and the fixed head metal structure serves as the positive electrode. When electrochemical corrosion occurs, since the potential at the zinc block end is more negative, it will preferentially undergo oxidation reaction and be consumed, thereby releasing electrons. These electrons flow to the protected metal structure through the wire, polarizing its surface, thereby inhibiting its corrosion.

[0015] The further improvement of the technical solution of the utility model is that: a plurality of leakage holes are opened on the side of the first filling trough and the second filling trough close to the side of the pit. A soil shielding plate is installed on the top of the first filling trough, and the soil shielding plate is slidably connected with the top of the first filling trough, and both sides of the soil shielding plate are in contact with the side of the pit; the soil shielding plate is used to shield the space below the soil shielding plate when filling the pit.

[0016] The above-mentioned technical scheme is adopted. In this scheme, a soil covering plate is set up. Before filling the pit, the soil covering plate is slid out to make it abut against the side of the shell groove. The upper end of the soil covering plate is still some distance away from the top of the pit groove, covering the lower part of the first filling groove of the pit groove. When burying, the position above the soil covering plate is buried and leveled with soil and then filling is carried out. When filling, cement mortar will first fill the first filling groove and the second filling groove. When the first filling groove and the second filling groove are full, excess cement mortar will flow from the leak hole into the outer slope of the first filling groove and the second filling groove, that is, the outer sides of the first filling groove and the second filling groove were originally filled with soil, but now they are replaced with cement mortar, which improves the bearing capacity and stability.

[0017] The further improvement of the technical solution of the utility model is that: the cross section of the pit is an inverted trapezoid, a pouring channel is provided on the bottom surface of the pit, and the width of the pouring channel is smaller than the bottom surface of the pit; the part of the bottom surface of the pit excluding the pouring channel is a receiving edge, and the receiving edge is used to receive the bottom end of the second filling groove. The bottom end of the second filling groove is provided with a flow channel opening, and the flow channel opening is connected with the pouring channel; the second filling groove is provided with a pouring port on the side surface perpendicular to the bottom surface.

[0018] The above technical solution is adopted, in which the bottom end of the device is placed on the receiving edge, and by setting the pouring channel and the flow channel opening, when the cement mortar fills the second filling tank, the excess cement mortar enters the pouring channel through the flow channel opening and the pouring port and gradually fills the pouring channel. After the cement mortar in the pouring channel solidifies, it forms another protective layer, which further reinforces and protects the bottom of the pipeline and further reduces the impact of the shield method on the pipeline;

[0019] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0020] 1. The utility model provides an underground pipeline protection device. When installing, the pipeline body is placed in the protective sleeve, and then the fixed head is slidably installed on both ends of the protective sleeve; at the same time, the end with a larger area of ​​the second filling slot is placed downward on the bottom surface, and then the plug on the baffle is inserted into the socket at the upper end of the second filling slot, so as to fix the baffle and the second filling slot, and then the protective sleeve is placed on the upper end of the second filling slot, and the fixed head is slid so that the fixed head is snapped into the snap-in on the baffle, so as to limit the fixed head, and finally the first filling slot is plugged on the baffle in the same way, which is simple and convenient; when using, the assembled components are placed in the pit. , then bury the pit with soil, and fill the filling box with cement mortar through the filling port. The cement mortar enters the first filling tank from the filling port and fills the first filling tank. Because the fixing head matches the arc mouth when fixed, the protective sleeve is placed on the upper end of the second filling tank through the fixing head, and the arc mouth of the filling tank is wider than the diameter of the protective sleeve. Therefore, after the cement mortar fills the first filling tank, it flows down along the gap between the protective sleeve and the second filling tank to the second filling tank. After the cement mortar solidifies, it will form a solid protective layer covering the protective sleeve. When construction is in progress above or shield construction is underway below, the protective layer can protect the protective sleeve and then the pipeline.

[0021] 2. The utility model provides an underground pipeline protection device, which sets a soil shielding plate. Before filling the pit, the soil shielding plate is slid out to make it abut against the side of the shell groove. The upper end of the soil shielding plate is still a distance away from the top of the pit groove, covering the lower part of the first filling groove of the pit groove. When burying, the position above the soil shielding plate is buried and leveled with soil, and then filling is carried out. When filling, cement mortar will first fill the first filling groove and the second filling groove. When the first filling groove and the second filling groove are full, excess cement mortar will flow from the leak hole into the outer inclined surface of the first filling groove and the second filling groove, that is, the outer sides of the first filling groove and the second filling groove were originally filled with soil, but now they are replaced with cement mortar, which improves the bearing capacity and stability.

[0022] 3. The utility model provides an underground pipeline protection device. By setting a pouring channel and a flow channel opening, when the cement mortar fills the second filling tank, the excess cement mortar enters the pouring channel through the flow channel opening and the pouring port and gradually fills the pouring channel. After the cement mortar in the pouring channel solidifies, it forms another protective layer, which further reinforces and protects the bottom of the pipeline and further reduces the impact of the shield method on the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model will be further described below in conjunction with the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the pit structure of the utility model;

[0026] Figure 3 It is a partial structural schematic diagram of the utility model;

[0027] Figure 4 This is a schematic diagram of the first structure of the first filling tank and the second filling tank of the utility model;

[0028] Figure 5 It is a schematic diagram of the cross-sectional structure of the first filling tank and the second filling tank of the utility model;

[0029] Figure 6 This is a schematic diagram of the second structure of the first filling tank and the second filling tank of the utility model;

[0030] In the figure: 1. pit; 2. protective sleeve; 3. pipeline body; 4. first filling slot; 5. second filling slot; 6. arc mouth; 7. filling box; 8. baffle; 9. protrusion; 10. clamp; 11. plug; 12. socket; 13. soil shield; 14. leakage hole; 15. irrigation channel; 16. receiving edge; 17. flow channel outlet; 18. filling port; 19. fixing head. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the embodiments:

[0032] Example 1

[0033] like Figure 1-6As shown, the utility model provides an underground pipeline protection device, including a pit 1 and a protective sleeve 2; a pipeline body 3 is sleeved in the protective sleeve 2; fixed heads 19 are slidably connected at both ends of the protective sleeve 2; a first filling groove 4 and a second filling groove 5 are provided at the upper and lower ends of the protective sleeve 2; the first filling groove 4 and the second filling groove 5 are connected at an arc 6 that matches the protective sleeve 2; a filling port is provided at the upper end of the first filling groove 4, and a filling box 7 is installed at the upper end of the filling port; the width of the arc 6 is larger than that of the protective sleeve 2; baffles 8 are provided on both sides of the protective sleeve 2, convex heads 9 are extended on both sides of the fixed head 19, and clamps 10 are extended at both ends of the baffle 8 along the axial direction of the protective sleeve 2, and a bayonet is formed between the two clamps 10, and the convex head 9 is slidably inserted in the bayonet, and the baffle 8 closes both sides of the first filling groove 4 and the second filling groove 5; plugs 11 are fixedly connected to the upper and lower ends of the baffle 8, and a socket 12 matching the plug 11 is opened on the end of the first filling groove 4 and the second filling groove 5 that contacts the baffle 8.

[0034] In this embodiment, during installation, the pipeline body 3 is placed in the protective sleeve 2, and then the fixing head 19 is slidably installed on both ends of the protective sleeve 2; at the same time, the end of the second filling tank 5 with a larger area is placed downward on the ground, and then the plug 11 on the baffle 8 is inserted into the socket 12 at the upper end of the second filling tank 5, so as to fix the baffle 8 and the second filling tank 5, and then the protective sleeve 2 is placed on the upper end of the second filling tank 5, and the fixing head 19 is slid so that the fixing head 19 is snapped into the snap-in on the baffle 8, so as to limit the fixing head 19, and finally the first filling tank 4 is plugged into the top of the baffle 8 in the same way; when in use, the assembled components are placed in the pit 1, and then mud is used to seal the baffle 8. The pit 1 is buried with soil, and cement mortar is poured into the filling box 7 through the filling port. The cement mortar enters the first filling tank 4 from the filling port and fills the first filling tank 4. Because the fixing head 19 matches the arc mouth 6 when fixed, the protective sleeve 2 is placed on the upper end of the second filling tank 5 through the fixing head 19, and the arc mouth 6 of the filling tank is wider than the diameter of the protective sleeve 2. Therefore, after the cement mortar fills the first filling tank 4, it flows down to the second filling tank 5 along the gap between the protective sleeve 2 and the second filling tank 5. After the cement mortar solidifies, it will form a solid protective layer covering the protective sleeve 2. When construction is in progress above or shield construction is underway below, the protective layer can protect the protective sleeve 2 and then the pipeline.

[0035] In this embodiment, preferably, the cross-sections of the first filling groove 4 and the second filling groove 5 are trapezoidal, and the arc opening 6 is opened at the short side end of the trapezoid.

[0036] By setting the first filling trough 4 and the second filling trough 5 to be trapezoidal, when the soil is buried, the side walls of the first filling trough 4 and the second filling trough 5 are filled with soil. After the burial grouting is completed, when the pipeline stays above and is rolled by heavy objects, the inclined surface can well disperse the gravity of the heavy objects above, reduce the pressure on the protective pipe sleeve, and thus improve the protection capability of the device.

[0037] The filling box 7 is in the shape of a funnel with a larger upper portion and a smaller lower portion. The filling box 7 is slidably connected to the filling port, and the filling box 7 is inserted into the filling port.

[0038] By setting the filling box 7 as a funnel, the filling efficiency is improved. The bottom end of the filling box 7 is plugged into the filling port. After the filling is completed, the filling box 7 can be taken out and the empty space can be filled with soil.

[0039] A zinc block is provided at the fixing head 19, and the zinc block is connected to the fixing head 19 via a wire.

[0040] By setting the zinc block, the zinc block and the fixing head 19 together form a primary battery system. In this system, the zinc block serves as the negative electrode and the metal structure of the fixing head 19 serves as the positive electrode. When electrochemical corrosion occurs, since the potential at the end of the zinc block is more negative, it will preferentially undergo oxidation reaction and be consumed, thereby releasing electrons. These electrons flow to the protected metal structure through the wire, polarizing its surface, thereby inhibiting its corrosion.

[0041] Example 2

[0042] like Figure 1-6 As shown, on the basis of embodiment 1, the utility model provides a technical solution: preferably, the first filling trough 4 and the second filling trough 5 are provided with a plurality of leak holes 14 on the side close to the side of the pit 1. A soil shielding plate 13 is installed on the top of the first filling trough 4, and the soil shielding plate 13 is slidably connected to the top of the first filling trough 4, and both sides of the soil shielding plate 13 are in contact with the side of the pit 1; the soil shielding plate 13 is used to shield the space below the soil shielding plate 13 when filling the pit.

[0043] In this embodiment, a soil shielding plate 13 is provided, and the soil shielding plate 13 is slid and pulled out before filling the pit, so that the soil shielding plate 13 is in contact with the side surface of the shell groove. The upper end of the soil shielding plate 13 is still a distance away from the top of the pit groove 1, covering the lower part of the first filling groove 4 of the pit groove 1. When burying, the position above the soil shielding plate 13 is buried and leveled with soil, and then filling is carried out. When filling, cement mortar will first fill the first filling groove 4 and the second filling groove 5. When the first filling groove 4 and the second filling groove are full, excess cement mortar will flow from the leak hole 14 into the outer slope of the first filling groove 4 and the second filling groove 5, that is, the outer sides of the first filling groove 4 and the second filling groove 5 were originally filled with soil, but now they are replaced with cement mortar, which improves the bearing capacity and stability.

[0044] Example 3

[0045] like Figure 1-2 As shown, on the basis of embodiment 1, the utility model provides a technical solution: preferably, the cross section of the pit 1 is an inverted trapezoid, and a pouring channel 15 is provided on the bottom surface of the pit 1, and the width of the pouring channel 15 is smaller than the bottom surface of the pit 1; the part of the bottom surface of the pit 1 excluding the pouring channel 15 is a receiving edge 16, and the receiving edge 16 is used to receive the bottom end of the second filling groove 5. A flow channel opening 17 is provided at the bottom end of the second filling groove 5, and the flow channel opening 17 is communicated with the pouring channel 15; a filling port 18 is provided on the side of the second filling groove 5 perpendicular to the bottom surface.

[0046] In this embodiment, the bottom end of the device is placed on the receiving edge 16. By setting the pouring channel 15 and the flow channel opening 17, when the cement mortar fills the second filling tank 5, the excess cement mortar enters the pouring channel 15 through the flow channel opening 17 and the pouring port 18 and gradually fills the pouring channel 15. After the cement mortar in the pouring channel 15 solidifies, it forms another protective layer, which further reinforces and protects the bottom of the pipeline and further reduces the impact of the shield method on the pipeline.

[0047] Example 4

[0048] The following is a detailed description of the working principle of the underground pipeline protection device.

[0049] like Figure 1-6As shown, during installation, place the pipeline body 3 in the protective sleeve 2, and then slide the fixing head 19 to install it on both ends of the protective sleeve 2; at the same time, place the second filling tank 5 with the larger end facing downward on the ground, and then insert the plug 11 on the baffle 8 into the socket 12 at the upper end of the second filling tank 5 to fix the baffle 8 and the second filling tank 5, and then place the protective sleeve 2 on the upper end of the second filling tank 5, and slide the fixing head 19 so that the fixing head 19 is snapped into the snap-in on the baffle 8, so as to limit the fixing head 19, and finally plug the first filling tank 4 above the baffle 8 in the same way; when in use, put the assembled components into In the pit 1, the pit 1 is then buried with soil, and cement mortar is poured into the filling box 7 through the filling port. The cement mortar enters the first filling tank 4 from the filling port and fills the first filling tank 4. Because the fixing head 19 matches the arc opening 6 during fixing, the protective sleeve 2 is placed on the upper end of the second filling tank 5 through the fixing head 19, and the arc opening 6 of the filling tank is wider than the diameter of the protective sleeve 2, so after the cement mortar fills the first filling tank 4, it flows down to the second filling tank 5 along the gap between the protective sleeve 2 and the second filling tank 5. After the cement mortar solidifies, it will form a solid protective layer covering the protective sleeve 2, which protects the protective sleeve 2 and then the pipeline. When the cement mortar fills the second filling tank 5, the excess cement mortar enters the pouring channel 15 through the flow channel opening 17 and the filling port 18 and gradually fills the pouring channel 15. After the cement mortar in the pouring channel 15 solidifies, it forms another protective layer to further reinforce and protect the bottom of the pipeline. By setting up a soil shielding plate 13, the soil shielding plate 13 is slid and pulled out before filling the pit, so that the soil shielding plate 13 is abutted against the side of the shell groove. The upper end of the soil shielding plate 13 is still a distance away from the top of the pit groove 1, covering the lower part of the first filling groove 4 of the pit groove 1. When burying, the position above the soil shielding plate 13 is buried and leveled with soil and then filling is carried out. When filling, the cement mortar will first fill the first filling groove 4 and the second filling groove 5. When the first filling groove 4 and the second filling groove are full, the excess cement mortar will flow from the leak hole 14 into the outer inclined surface of the first filling groove 4 and the second filling groove 5.

[0050] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. An underground pipeline protection device, comprising a pit (1) and a protection casing (2); characterized in that: The protective sleeve (2) is sleeved with a pipeline body (3); the two ends of the protective sleeve (2) are slidably connected with fixed heads (19); the upper and lower ends of the protective sleeve (2) are provided with a first filling groove (4) and a second filling groove (5); the connection between the first filling groove (4) and the second filling groove (5) is an arc opening (6) matching the protective sleeve (2); the upper end of the first filling groove (4) is provided with a filling port, and the upper end of the filling port is provided with a filling box (7); the width of the arc opening (6) is greater than the diameter of the protective sleeve (2); baffles ( 8), protrusions (9) extend from both sides of the fixed head (19), and clamps (10) extend from both ends of the baffle (8) along the axial direction of the protective sleeve (2), a bayonet is formed between the two clamps (10), and the protrusion (9) is slidably plugged into the bayonet, and the baffle (8) closes both sides of the first filling groove (4) and the second filling groove (5); plugs (11) are fixedly connected at the upper and lower ends of the baffle (8), and a socket (12) matching the plug (11) is provided on the end of the first filling groove (4) and the second filling groove (5) that contacts the baffle (8).

2. An underground pipeline protection device according to claim 1, characterized in that: The cross-sections of the first filling groove (4) and the second filling groove (5) are trapezoidal, and the arc opening (6) is opened at the short side end of the trapezoid.

3. An underground pipeline protection device according to claim 2, characterized in that: A soil shielding plate (13) is installed at the top of the first filling trough (4), and the soil shielding plate (13) is slidably connected to the top of the first filling trough (4), and both sides of the soil shielding plate (13) are in contact with the side surfaces of the pit (1); the soil shielding plate (13) is used to shield the space below the soil shielding plate (13) when filling the pit.

4. The underground pipeline protection device according to claim 3, characterized in that: A plurality of leakage holes (14) are provided on the side surfaces of the first filling groove (4) and the second filling groove (5) which are close to the side surfaces of the pit groove (1).

5. An underground pipeline protection device according to claim 4, characterized in that: The cross section of the pit (1) is an inverted trapezoid. A pouring channel (15) is provided on the bottom surface of the pit (1). The width of the pouring channel (15) is smaller than the bottom surface of the pit (1). The portion of the bottom surface of the pit (1) excluding the pouring channel (15) is a receiving edge (16). The receiving edge (16) is used to receive the bottom end of the second filling groove (5).

6. An underground pipeline protection device according to claim 5, characterized in that: The bottom end of the second filling trough (5) is provided with a flow channel opening (17), and the flow channel opening (17) is communicated with the filling channel (15); the second filling trough (5) is provided with a filling port (18) on the side surface perpendicular to the bottom surface.

7. An underground pipeline protection device according to claim 6, characterized in that: The filling box (7) is in the shape of a funnel with a larger upper portion and a smaller lower portion. The filling box (7) is slidably connected to the filling port, and the filling box (7) is inserted into the filling port.

8. An underground pipeline protection device according to claim 7, characterized in that: A zinc block is provided at the fixed head (19), and the zinc block is connected to the fixed head (19) via a wire.

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