Compression-resistant prefabricated directly-buried thermal insulation pipe
By installing spring expansion rings and branch pipe structures on the outside of the pipeline, the problem of rupture caused by sliding of the pressure-resistant prefabricated direct-buried insulated pipe during small-scale land collapse was solved, thus achieving pipeline stability and continuity of heating.
Patent Information
- Application Number
- CN202520241672.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-02-17
AI Technical Summary
Existing pressure-resistant prefabricated direct-buried insulated pipes are prone to slippage and rupture when there is a small-scale land collapse, causing leaks and heating interruptions.
A spring-loaded expansion ring and branch pipe structure are installed on the outside of the pipeline. The spring-loaded expansion ring can freely engage with the outer pipe. The inner ring is connected to the outer ring through a buffer ring. Branch pipes are evenly distributed on the outer ring. The support rods inside the branch pipes are fixed by the expansion springs. The lignin cap degrades after burial. The support rods pop out to enhance the grip and are confined inside the branch pipes during pipeline transportation, reducing the land occupation.
It effectively reduces pipe slippage, enhances grip, prevents pipe rupture and leakage, and ensures heating stability.
Smart Images
Figure CN223740378U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to water conservancy engineering technical field especially, relate to a kind of compression-precast direct-buried heat preservation pipe. BACKGROUND
[0002] Heat preservation pipe is generally composed of inner working pipe, insulation layer and outer sheath, and is commonly of polyurethane and rock wool type, used in central heating, industry, building and refrigeration fields, can reduce heat transfer and ensure medium temperature stability, with energy saving and consumption reduction advantages.
[0003] Due to the excellent performance of heat preservation pipe, it is widely used in urban central heating system. Heat preservation pipe is responsible for transporting high-temperature hot water or steam produced by thermal power plant to each residential area and commercial building. Heat preservation pipe can greatly reduce heat loss during transmission, ensure heating effect and improve energy utilization. However, due to special circumstances, some users need to place heat preservation pipe underground for transportation work, so a compression-precast direct-buried heat preservation pipe is needed.
[0004] The existing compression-precast direct-buried heat preservation pipe has the following disadvantages:
[0005] Currently, all compression-precast direct-buried heat preservation pipes on the market are cylindrical in shape. If the buried land collapses in a small area, the contact area between the pipe and the collapsed land changes, and the stress angle and orientation also change. Due to its cylindrical shape, the pipe will slide towards the collapsed land. When the pipe starts to slide, it will pull other connected pipes to slide. At this time, whether other segmented pipes slide or not, excessive pulling will cause pipe rupture, resulting in pipe leakage, interruption of resident and factory supply, and irreparable loss.
[0006] Therefore, we propose a compression-precast direct-buried heat preservation pipe to solve the above problems. CONTENT OF THE UTILITY MODEL
[0007] The outer side of the pipeline is provided with a groove, and a spring telescopic ring is slidably connected in the groove, the spring telescopic ring can flexibly extend and contract on the fixed inner ring, the spring telescopic ring and the outer pipe can be freely clamped, the whole device can be freely assembled and disassembled with the pipeline, and the transportation performance of the pipeline is not adversely affected, the inner ring is connected with the outer ring through the buffer ring, a plurality of branch pipes are uniformly distributed and fixed on the outer ring to enhance the grip of the pipeline in multiple directions and reduce the possibility of sliding of the pipeline, a slidable support rod is arranged in each branch pipe, the support rod is fixed with the outer pipe through the telescopic spring, and a lignin cover is fixed outside the branch pipe, which functions to limit the support rod and prevent the support rod from being ejected by the fixed telescopic spring, the lignin cover is made of lignin material which is easy to degrade, and when the device is buried underground, the lignin cover will quickly degrade, at which time the telescopic spring in the branch pipe will eject the support rod, and the specific length of the ejected support rod is determined by the hardness of the surrounding land, which further enhances the grip between the pipeline and the land, and the lignin cover limits the support rod in the branch pipe during the device burying and transporting process, thereby effectively reducing the space occupied by the device to solve the problems in the above background art.
[0008] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a kind of anti-pressure prefabricated direct-buried heat preservation pipe, including outer pipe, the outer side of the outer pipe is clamped with spring telescopic ring, the outer side of the spring telescopic ring is fixedly connected with inner ring, the outer side of the inner ring is fixedly connected with buffer ring, the outer side of the buffer ring is fixedly connected with outer ring, the outer side of the outer ring is fixedly connected with telescopic spring, the outer side of the telescopic spring is provided with branch pipe, the branch pipe is fixedly connected with the outer ring, the inner side of the branch pipe is slidably connected with support rod, the other end of the support rod is fixedly connected with telescopic spring, the outer side of the branch pipe is fixedly connected with lignin cover, the inside of the outer pipe is provided with waterproof hammer gate mechanism.
[0009] Preferably, a connecting shaft is included, which is rotatably connected to the outer side of the outer pipe, a handle is slidably connected to the inner side of the connecting shaft, a connecting rod is slidably connected to the inside of the connecting shaft, a gate is fixedly connected to the other end of the connecting shaft, a sealing plate is slidably connected to the inside of the gate, and the sealing plate is fixedly connected to the connecting rod.
[0010] Preferably, a plurality of fastening rings are fixedly connected to the outer side of the outer pipe, and a groove is formed on the outer side of the outer pipe, which is slightly larger than the size of the spring telescopic ring.
[0011] Preferably, an outer reinforcing layer is fixedly connected to the inside of the outer pipe, a heat preservation layer is fixedly connected to the inside of the outer reinforcing layer, and an inner pipe is fixedly connected to the inside of the heat preservation layer.
[0012] Preferably, the inner tube is fixedly connected with an inner reinforcing layer, the inner reinforcing layer is fixedly connected with a stainless steel pipe, and holes are formed in the outer reinforcing layer, the heat preservation layer, the inner tube, the inner reinforcing layer and the stainless steel pipe, and the holes are slightly larger than the size of the connecting shaft.
[0013] Preferably, the inner tube is fixedly connected with a fixed frame, and the inner side of the fixed frame is rotatably connected with a telescopic sleeve.
[0014] Preferably, the inner side of the telescopic sleeve is slidably connected with two telescopic middle pipes, the inner side of each of the two telescopic middle pipes is slidably connected with a telescopic inner rod, and the outer side of the telescopic inner rod is fixedly connected with a plurality of brushes.
[0015] Preferably, the inner end of the telescopic middle pipe is fixedly connected with a spring and fixedly connected to the inner side of the telescopic sleeve, and the inner end of the telescopic inner rod is fixedly connected with a spring and fixedly connected to the inner side of the telescopic middle pipe.
[0016] Preferably, the length of the brush is equal to the inner diameter of the inner tube, and the brush is made of conductive nylon material.
[0017] Preferably, the outer side of the connecting shaft is rotatably connected with a sealing ring, the outer side of the sealing ring is rotatably connected with a sealing valve, the sealing valve is fixedly connected with the outer tube, and the inner side of the connecting rod is provided with a threaded hole.
[0018] Compared with the prior art, the utility model has the advantages and positive effects that:
[0019] 1. In the utility model, when the anti-pressure prefabricated directly-buried heat preservation pipe is used in actual work, and irregular small-range landslides are encountered, the telescopic spring telescopic ring in the groove on the outer side of the anti-pressure prefabricated directly-buried heat preservation pipe is freely clamped with the outer tube, the design can be freely disassembled without affecting pipeline transportation, the inner ring is connected with the outer ring through the buffer ring, the outer ring branch pipes are uniformly distributed, the pipeline grip is increased to reduce sliding, the branch pipe inner support rod is connected with the outer tube through the telescopic spring, and the outer side is provided with a lignin cover limiting part; due to the material properties of lignin itself, the lignin cover can be quickly degraded after being buried, at this time, the telescopic spring that loses the limiting part pops out the support rod, the pop-out length is determined by the hardness of the land, the support rod is fully inserted into the surrounding land, the contact area with the land is increased, the grip is further enhanced, when the pipe is buried and transported, the lignin cover that has not been degraded limits the support rod in the branch pipe, the land occupation is reduced, and the transportation performance is improved, thus the problem that the pipeline is easily slid due to the change of the state of the land and causes the pipeline to be broken by pulling the remaining pipeline is solved by increasing the grip of the pipeline, and the loss caused by the interruption of the supply of residents and factories due to pipeline leakage is avoided.
[0020] 2. The utility model discloses, pipeline is buried in the ground and is inconvenient to maintain, in order to reduce the damage factor, the inside of the gate that is equipped with in the stainless steel pipe is equipped with the space, wherein the sealing plate is slid, the sealing plate is connected with the connecting rod, and the connecting rod is slid in the connecting shaft that is fixed with the gate, and the sealing plate can be controlled to slide in the gate by moving the connecting rod, a plurality of through holes are formed on the gate, when closing the pipeline, first twist handle drives the gate to rotate to close through the connecting shaft, and the handle is pulled out to expose the connecting rod, and the connecting rod is screwed with the screwdriver, and the connecting rod is pulled out to make the sealing plate move outwards, when the sealing plate coincides with the hole on the gate, the gate is sealed, and the purpose of closing the pipeline is achieved, and the problem that the liquid of the torrent can form water hammer impact on the pipeline when the traditional gate is closed is solved, and the service life of the pipeline is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 A front view structural perspective view of the anti-pressure prefabricated directly-buried heat preservation pipe is provided for the utility model;
[0022] Figure 2 A structure split perspective view of the anti-pressure prefabricated directly-buried heat preservation pipe is provided for the utility model;
[0023] Figure 3 A partial structure split perspective view of the anti-pressure prefabricated directly-buried heat preservation pipe is provided for the utility model;
[0024] Figure 4 A structure split perspective view of the water hammer prevention valve mechanism of the anti-pressure prefabricated directly-buried heat preservation pipe is provided for the utility model;
[0025] Figure 5 A brush structure display view of the anti-pressure prefabricated directly-buried heat preservation pipe is provided for the utility model;
[0026] Figure 6 A plan view of the anti-pressure prefabricated directly-buried heat preservation pipe is provided for the utility model.
[0027] Legend: 1, outer pipe; 2, water hammer prevention valve mechanism; 201, gate; 202, connecting shaft; 203, handle; 204, connecting rod; 205, sealing plate; 206, sealing valve; 207, sealing ring; 3, spring telescopic ring; 4, inner ring; 5, buffer ring; 6, outer ring; 7, telescopic spring; 8, branch pipe; 9, support rod; 10, lignin cover; 11, fixed frame; 12, telescopic sleeve; 13, telescopic middle pipe; 14, telescopic inner rod; 15, brush; 16, fastening ring; 17, outer reinforcing layer; 18, heat preservation layer; 19, inner pipe; 20, inner reinforcing layer; 21, stainless steel pipe. DETAILED DESCRIPTION
[0028] In order to enable the above-mentioned purposes, features and advantages of the present application to be more clearly understood, the present application will be further described below with reference to the drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0029] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can be practiced in different ways from those described herein, and therefore the present application is not limited to the specific embodiments disclosed in the following description.
[0030] Embodiment 1, as shown in the accompanying drawings Figure 1 , Figure 2 and Figure 3 A kind of anti-pressure prefabricated direct-buried heat preservation pipe, including outer tube 1, spring expansion ring 3 is engaged with the outside of outer tube 1, spring expansion ring 3 is fixedly connected with the outside of inner ring 4, inner ring 4 is fixedly connected with the outside of buffer ring 5, buffer ring 5 is fixedly connected with the outside of outer ring 6, outer ring 6 is fixedly connected with the outside of expansion spring 7, expansion spring 7 is provided with branch pipe 8 on the outside, branch pipe 8 is fixedly connected with outer ring 6, branch pipe 8 is slidably connected with the inside of support rod 9, support rod 9 is fixedly connected with the other end of expansion spring 7, branch pipe 8 is fixedly connected with lignin cover 10 on the outside, waterproof hammer gate 201 mechanism is arranged in the inside of outer tube 1.
[0031] The effect achieved by the whole embodiment 1 is that spring expansion ring 3 is slidably connected in the groove formed on the outside of outer tube 1, spring expansion ring 3 can be expanded and contracted on fixed inner ring 4, spring expansion ring 3 can be freely engaged with outer tube 1, inner ring 4 is connected with outer ring 6 through buffer ring 5, multiple branch pipes 8 fixed on outer ring 6 are evenly distributed around to increase the gripping force of the pipeline in multiple directions, support rod 9 slidably arranged in branch pipe 8 is fixed with outer tube 1 through expansion spring 7, and lignin cover 10 fixed on the outside of branch pipe 8 limits support rod 9, preventing expansion spring 7 fixed on support rod 9 from being ejected, the lignin material of lignin cover 10 itself is a relatively easy-to-degrade material, which is quickly degraded when buried underground, and expansion spring 7 in branch pipe 8 ejects support rod 9.
[0032] Embodiment 2, as shown in the accompanying drawings Figure 2 and Figure 4 It includes connecting shaft 202, connecting shaft 202 is rotatably connected on the outside of outer tube 1, handle 203 is slidably connected on the inside of connecting shaft 202, connecting rod 204 is slidably connected in the inside of connecting shaft 202, gate 201 is fixedly connected on the other end of connecting shaft 202, sealing plate 205 is slidably connected in the inside of gate 201, sealing plate 205 is fixedly connected with connecting rod 204.
[0033] The effect achieved by the whole embodiment 2 is that the sealing plate 205 can be controlled to slide inside the gate 201 by moving the connecting rod 204, a plurality of holes are formed through the gate 201, when the pipeline is closed, the handle 203 is twisted to drive the gate 201 to rotate and close, the connecting shaft 202 is pulled out to expose the connecting rod 204, the threaded screwdriver is screwed with the connecting rod 204, and the connecting rod 204 is pulled outwards to drive the sealing plate 205 to coincide with the holes on the gate 201.
[0034] Embodiment 3, as shown in Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , a plurality of fastening rings 16 are fixedly connected to the outer side of the outer pipe 1, a groove larger than the spring expansion ring 3 is formed on the outer side of the outer pipe 1, an outer reinforcing layer 17 is fixedly connected inside the outer pipe 1, the outer reinforcing layer 17 is fixedly connected inside the outer pipe 1, and the outer reinforcing layer 17 is fixedly connected inside the outer pipe 1.
[0035] The effect achieved by the whole embodiment 3 is that the fastening ring 16 can tightly adhere the multi-layer pipeline together, enhance the overall strength of the multi-layer pipe, and further improve the explosion-proof and crack resistance of the pipeline, the heat preservation layer 18 realizes the heat preservation effect of the pipeline, and reduces the energy loss of the liquid transported in the pipeline.
[0036] Embodiment 4, as shown in Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , the inner pipe 19 is fixedly connected inside the inner reinforcing layer 20, the inner reinforcing layer 20 is fixedly connected inside the stainless steel pipe 21, the outer reinforcing layer 17, the heat preservation layer 18, the inner pipe 19, the inner reinforcing layer 20 and the stainless steel pipe 21 are all provided with holes larger than the size of the connecting shaft 202, the inner pipe 19 is fixedly connected inside the fixed frame 11, the inner side of the fixed frame 11 is rotatably connected with the telescopic sleeve 12, the inner side of the telescopic sleeve 12 is slidably connected with two telescopic intermediate pipes 13, the inner side of the two telescopic intermediate pipes 13 is slidably connected with the telescopic inner rod 14, the outer side of the telescopic inner rod 14 is fixedly connected with a plurality of brushes 15, the inner end of the telescopic intermediate pipe 13 is fixedly connected with a spring and fixedly connected to the inner side of the telescopic sleeve 12, the inner end of the telescopic inner rod 14 is fixedly connected with a spring and fixedly connected to the inner side of the telescopic intermediate pipe 13, the length of the brush 15 is equal to the inner diameter of the inner pipe 19, the brush 15 is made of conductive nylon material, the outer side of the connecting shaft 202 is rotatably connected with the sealing ring 207, the outer side of the sealing ring 207 is rotatably connected with the sealing valve 206, the sealing valve 206 is fixedly connected with the outer pipe 1, and the inner side of the connecting rod 204 is provided with a threaded hole.
[0037] The effect achieved by the whole embodiment 4 is that the inner reinforcing layer 20 reduces the impact force of the pipeline inside on the inner tube 19, the fixing frame 11 is used for fixing the telescopic sleeve pipe 12, the inside of the telescopic sleeve pipe 12 slides the telescopic middle pipe 13 through the spring, the inside of the telescopic middle pipe 13 slides the telescopic inner rod 14 through the spring, the outside of the telescopic inner rod 14 is fixedly connected with a plurality of brushes 15, when the water flow flows, the brushes 15 rotate to clean the pipe, when the water flow faces the water flow impact, the telescopic sleeve pipe 12, the telescopic middle pipe 13 and the telescopic inner rod 14 are affected by the spring contraction under the thrust, the telescopic sleeve pipe 12, the telescopic middle pipe 13 and the telescopic inner rod 14 are contracted and drive the brushes 15 to move inward, and the telescopic sleeve pipe 12, the telescopic middle pipe 13 and the telescopic inner rod 14 at the rear are affected by the pulling force of the water flow impact, the spring is elongated to drive the telescopic sleeve pipe 12, the telescopic middle pipe 13 and the telescopic inner rod 14 to extend to drive the brushes 15 to move outward, thus realizing that the brushes 15 can automatically clean different positions in the pipe.
[0038] The working principle of the whole device is that when encountering a small range of irregular land collapse, a groove is formed on the outside of the anti-pressure prefabricated directly buried heat preservation pipe, a spring telescopic ring 3 is slidably connected in the groove, the spring telescopic ring 3 can be telescoped on the fixed inner ring 4, the spring telescopic ring 3 and the outer pipe 1 can be freely clamped, the whole device can be freely assembled and disassembled with the pipeline, and the transportability of the pipeline is not reduced, the inner ring 4 is connected with the outer ring 6 through the buffer ring 5, a plurality of branch pipes 8 fixedly arranged on the outer ring 6 are evenly distributed around to increase the gripping force of the pipeline in multiple directions and reduce the possibility of pipeline sliding, the support rod 9 slidably arranged in the branch pipe 8 is fixed with the outer pipe 1 through the telescopic spring 7, and the lignin cover 10 fixedly arranged outside the branch pipe 8 limits the support rod 9, preventing the telescopic spring 7 fixedly arranged on the support rod 9 from being popped out, the lignin material of the lignin cover 10 itself is a relatively easy-to-degrade material, which is quickly degraded when buried underground, the telescopic spring 7 in the branch pipe 8 pops out the support rod 9, and the specific pop-out length depends on the hardness of the surrounding land, further increasing the gripping force of the pipeline and the land, and the lignin cover 10 reduces the occupied space of the device by limiting the support rod 9 in the branch pipe 8 when buried and transported.
[0039] In order to reduce the damage of pipeline as far as possible, the gate 201 is arranged in the stainless steel pipe 21, the space is arranged in the inside of the gate 201, the sealing plate 205 is slidably connected in the space, the connecting rod 204 is fixed on the sealing plate 205, the connecting rod 204 is slidably arranged in the connecting shaft 202, the connecting shaft 202 is fixed on the gate 201, so that the sealing plate 205 is controlled to slide in the gate 201 by moving the connecting rod 204, the plurality of holes are arranged in the gate 201, so that when the pipeline needs to be closed, the handle 203 is screwed to drive the gate 201 to rotate through the connecting shaft 202 until the gate 201 is closed, then the handle 203 is pulled out to expose the connecting rod 204, then the screwdriver is used to be screwed with the connecting rod 204, then the connecting rod 204 is pulled out to drive the sealing plate 205 to move outward, when the sealing plate 205 is overlapped with the hole in the gate 201, the gate 201 is sealed.
[0040] The above is only the preferred embodiment of the present application, and does not limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technology content to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present application still belong to the protection scope of the present application.
Claims
1. A pressure-resistant prefabricated direct-buried insulated pipe, characterized in that: The utility model provides a waterproof hammer sluice mechanism, which comprises an outer tube (1), a spring telescopic ring (3) is clamped on the outer side of the outer tube (1), an inner ring (4) is fixedly connected to the outer side of the spring telescopic ring (3), a buffer ring (5) is fixedly connected to the outer side of the inner ring (4), an outer ring (6) is fixedly connected to the outer side of the buffer ring (5), a telescopic spring (7) is fixedly connected to the outer side of the outer ring (6), a branch pipe (8) is arranged on the outer side of the telescopic spring (7), the branch pipe (8) is fixedly connected to the outer ring (6), a support rod (9) is slidably connected to the inner side of the branch pipe (8), the other end of the telescopic spring (7) is fixedly connected to the support rod (9), a lignin cover (10) is fixedly connected to the outer side of the branch pipe (8), and the waterproof hammer sluice mechanism (2) is arranged in the inner part of the outer tube (1).
2. A pressure-resistant prefabricated directly-buried heat-preservation pipe according to claim 1, characterized in that: The utility model provides a waterproof hammer sluice mechanism, which comprises an outer tube (1), a spring telescopic ring (3) is clamped on the outer side of the outer tube (1), an inner ring (4) is fixedly connected to the outer side of the spring telescopic ring (3), a buffer ring (5) is fixedly connected to the outer side of the inner ring (4), an outer ring (6) is fixedly connected to the outer side of the buffer ring (5), a telescopic spring (7) is fixedly connected to the outer side of the outer ring (6), a branch pipe (8) is arranged on the outer side of the telescopic spring (7), the branch pipe (8) is fixedly connected to the outer ring (6), a support rod (9) is slidably connected to the inner side of the branch pipe (8), the other end of the telescopic spring (7) is fixedly connected to the support rod (9), a lignin cover (10) is fixedly connected to the outer side of the branch pipe (8), and the waterproof hammer sluice mechanism (2) is arranged in the inner part of the outer tube (1).
3. A pressure-resistant prefabricated directly-buried heat-preservation pipe according to claim 1, characterized in that: The outer side of the outer tube (1) is fixedly connected with a plurality of fastening rings (16), and the outer side of the outer tube (1) is provided with a groove larger in size than the spring telescopic ring (3).
4. A pressure-resistant prefabricated directly-buried heat-preservation pipe according to claim 1, characterized in that: The inner part of the outer tube (1) is fixedly connected with an outer reinforcing layer (17), the inner part of the outer reinforcing layer (17) is fixedly connected with a heat preservation layer (18), and the inner part of the heat preservation layer (18) is fixedly connected with an inner tube (19).
5. A pressure-resistant prefabricated directly-buried heat-preservation pipe according to claim 4, characterized in that: The inner part of the inner tube (19) is fixedly connected with an inner reinforcing layer (20), the inner part of the inner reinforcing layer (20) is fixedly connected with a stainless steel tube (21), and the outer reinforcing layer (17), the heat preservation layer (18), the inner tube (19), the inner reinforcing layer (20) and the stainless steel tube (21) are all provided with holes larger in size than the connecting shaft (202).
6. A pressure-resistant prefabricated directly-buried heat-preservation pipe according to claim 5, characterized in that: The inner part of the inner tube (19) is fixedly connected with a fixing frame (11), and the inner side of the fixing frame (11) is rotatably connected with a telescopic sleeve (12).
7. A pressure-resistant prefabricated directly-buried heat-preservation pipe according to claim 6, characterized in that: The inner side of the telescopic sleeve (12) is slidably connected with two telescopic middle pipes (13), the inner sides of the two telescopic middle pipes (13) are slidably connected with telescopic inner rods (14), and the outer sides of the telescopic inner rods (14) are fixedly connected with a plurality of brushes (15).
8. A pressure-resistant prefabricated directly-buried heat-preservation pipe according to claim 7, characterized in that: The inner end of the telescopic middle pipe (13) is fixedly connected with a spring and fixedly connected to the inner side of the telescopic sleeve (12), and the inner end of the telescopic inner rod (14) is fixedly connected with a spring and fixedly connected to the inner part of the telescopic middle pipe (13).
9. The anti-crush prefabricated directly-buried heat-preservation tube according to claim 7, characterized in that: The length of the brush (15) is equal to the inner diameter size of the inner tube (19), and the brush (15) is made of conductive nylon material.
10. The anti-crush prefabricated directly-buried heat-preservation tube according to claim 2, characterized in that: The outer side of the connecting shaft (202) is rotationally connected with a sealing ring (207), the outer side of the sealing ring (207) is rotationally connected with a sealing valve (206), the sealing valve (206) is fixedly connected with the outer pipe (1), and the inner side of the connecting rod (204) is provided with a threaded hole.