Prefabricated directly-buried thermal insulation pipe and using method thereof

Abstract

The invention provides a prefabricated directly-buried heat preservation pipe and a using method thereof, and belongs to the technical field of heat preservation pipes, the prefabricated directly-buried heat preservation pipe comprises a first connecting pipe, a first heat preservation layer is fixedly connected to the first connecting pipe, a first inner pipe is fixedly connected to the first heat preservation layer, a butt joint groove is formed in the first heat preservation layer, and a butt joint block is installed in the butt joint groove; a butt joint block is fixedly connected to the first heat preservation layer, a second heat preservation layer is fixedly connected to the butt joint block, a second inner pipe and a second connecting pipe are fixedly connected to the inner side and the outer side of the second heat preservation layer respectively, a first connecting block is fixedly connected to the first heat preservation layer, and a first mounting groove used for being in butt joint with the first connecting block is formed in the second heat preservation layer. The problems that according to an existing heat preservation pipeline, the height difference cannot be compensated while the sealing effect is kept, the automatic clamping function cannot be achieved through the air pressure change of a butt joint area after butt joint, and the preheating function on the peripheral space of the heat preservation pipeline cannot be achieved through hot air are solved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal insulation pipes, in particular to a prefabricated direct-buried thermal insulation pipe and a use method thereof. Background Art

[0002] Prefabricated direct buried insulated pipe is a kind of pipeline system widely used in heat transmission, heating, hot water supply, petroleum, chemical industry and other industries. It is mainly composed of three parts: steel pipe, insulation layer and outer protective pipe. The steel pipe is used to carry fluid, the insulation layer plays a role in reducing heat loss and maintaining heat energy, and the outer protective pipe protects the insulation layer from the influence of the external environment to ensure the safety and stability of the whole system. The existing insulation pipe still has some shortcomings.

[0003] The invention patent with the publication number CN113790583A discloses a prefabricated direct-buried thermal insulation pipe, including a pre-buried installation frame, a ring-shaped protective plate for supporting the thermal insulation pipe is fixedly connected at the inner center of the pre-buried installation frame, a supporting seat with a partitioning function is arranged inside the ring-shaped protective plate, a thermal insulation pipe seat is installed inside the ring-shaped protective plate, and thermal insulation cotton with a thermal insulation function is arranged inside the thermal insulation pipe seat, an adding mechanism with an adding function is movably connected on the surface of the thermal insulation pipe seat and located inside the ring-shaped protective plate, a recovery seat with a placing function is installed inside the pre-buried installation frame, and the pre-buried installation frame includes a connecting bracket seat, and the number of the connecting bracket seats is three. When in use, the effect of automatically absorbing water vapor from the thermal insulation cotton according to the changes in the external environment is achieved, avoiding the problem that the thermal insulation cotton is affected by too much moisture and affects its own use. Although the above-mentioned pipeline can realize the moisture-proof function, when there is a height difference between the bottom supporting structures of the two pipelines, the existing insulated pipeline cannot make up for the height difference while maintaining the sealing effect, and the existing insulated pipeline cannot realize the automatic clamping function by utilizing the air pressure change in the docking area after docking, and cannot realize the function of preheating the outer space of the pipeline by utilizing hot air. Summary of the invention

[0004] In view of the problems existing in the existing thermal insulation pipes, the present invention is proposed.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: A prefabricated direct-buried thermal insulation pipe comprises a first connecting pipe, a first thermal insulation layer is fixedly connected to the first connecting pipe, a first inner pipe is fixedly connected to the first thermal insulation layer, a docking groove is provided on the first thermal insulation layer, a docking block is installed in the docking groove, a second thermal insulation layer is fixedly connected to the docking block, the second inner pipe and the second connecting pipe are fixedly connected to the inner and outer sides of the second thermal insulation layer respectively, a first connecting block is fixedly connected to the first thermal insulation layer, a first mounting groove for docking with the first connecting block is provided on the second thermal insulation layer, a docking assembly is provided in the second thermal insulation layer, a card slot is provided on the first connecting block, the first connecting block, the first thermal insulation layer and the first connecting pipe are all provided with through holes connected to each other, a connecting pipe is provided on the top of the first connecting pipe and the second connecting pipe, a winding pipe is provided on the top of the connecting pipe, support blocks are fixedly provided on both ends of the winding pipe, and a connection assembly is installed on the outer side of the first connecting pipe.

[0006] As a preferred solution of the present invention, the central axes of the first connecting tube, the second connecting tube, the first insulation layer, the second insulation layer, the first inner tube and the second inner tube are all collinear, the length of the second inner tube contracted inwardly at the rear side of the second insulation layer is equal to the length of the first inner tube protruding outwardly at the front side of the first insulation layer, and the first inner tube and the second inner tube are connected to each other with the interior of the winding tube through a connecting tube.

[0007] As a preferred solution of the present invention, the first connecting tube, the first thermal insulation layer and the first inner tube are fixedly connected as an integral structure, the second connecting tube, the second thermal insulation layer and the second inner tube are fixedly connected as an integral structure, and the front surfaces of the second connecting tube, the second thermal insulation layer and the second inner tube are in contact with the rear surfaces of the first connecting tube, the first thermal insulation layer and the first inner tube.

[0008] As a preferred solution of the present invention, the diameter of the front half of the docking block is greater than the diameter of the rear half of the docking block, the length of the docking block is equal to the depth of the docking groove, and there is a gap between the docking block and the docking groove.

[0009] As a preferred solution of the present invention, the docking blocks are evenly distributed along the circumference of the second insulation layer, and the docking grooves are evenly distributed along the circumference of the first insulation layer. The positions and number of the docking blocks correspond to the positions and number of the docking grooves.

[0010] As a preferred solution of the present invention, a groove is provided on the first connecting block, a damping ring is fixedly connected in the groove, the cross section of the damping ring is a semicircular structure, the radius of the semicircle of the cross section of the damping ring is greater than the depth of the groove, and the groove is annular.

[0011] As a preferred solution of the present invention, one end of the through hole extends to the inner wall of the slot on the first connecting block, and the other end of the through hole extends to the outside of the first connecting pipe.

[0012] As a preferred solution of the present invention, the docking assembly includes a first connecting groove, a second connecting groove and a slide groove which are opened in the first insulation layer, a slider is slidably installed in the slide groove, a card block is fixedly connected to the slider, the first installation groove, the first connecting groove and the second connecting groove are connected to each other, the card block is suitable for moving into the card groove in the first connecting block when the first connecting block moves into the first installation groove, and the front side of the first connecting block is a truncated cone structure.

[0013] As a preferred solution of the present invention, the connection assembly includes a sealing ring fitted on the outside of the first connecting tube, the sealing ring is fixedly connected to the third connecting tube, the third connecting tube is installed with a rubber block, and a cross slit is provided in the middle of the rubber block.

[0014] A method for using a prefabricated direct-buried thermal insulation pipe comprises the following steps: S1: according to the required laying length of the insulation pipe, multiple groups of first connecting pipes and second connecting pipes are connected end to end, and the first connecting block on the first insulation layer is installed into the first installation groove in the first insulation layer. The first connecting block will increase the air pressure in the first installation groove during the movement; S2: After the air pressure in the first installation groove increases, the first connection block is automatically connected to the second insulation layer through the docking assembly and the first installation groove. When the docking state needs to be cancelled later, the docking assembly on the first connection pipe can be moved to the position of the through hole, and the air pressure in the through hole is increased so that the first connection block is no longer connected to the second insulation layer; S3: When the insulation pipe is laid, the winding pipe can be supported by the support block, and the first connecting pipe and the second connecting pipe can be supported by the winding pipe, and hot air can enter the winding pipe through the connecting pipe to heat the external space of the first connecting pipe and the second connecting pipe; S4: When there is a height difference between the bottom support positions of the first connecting tube and the second connecting tube, the docking block slides in the docking groove to make up for the height difference between the first connecting tube and the second connecting tube.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The depth of the docking groove on the insulation pipe is the same as the length of the docking block, but there is a gap between the docking groove and the docking block, so that the first connecting pipe, the first insulation layer and the first inner pipe can move with the second connecting pipe, the second insulation layer and the second inner pipe, and the overall sealing effect can be maintained to adapt to the docking work of two groups of insulation pipes with different height differences, thereby enhancing the adaptability of the insulation pipe and solving the problem that the existing insulation pipe cannot make up for the height difference while maintaining the sealing effect. The insulation pipe has the advantage of stronger applicability.

[0016] 2. By setting the first installation groove, the first connecting block and the docking assembly, when the first connecting block is installed into the first installation groove, the air pressure in the first installation groove, the first connecting groove and the second connecting groove increases, and the slider in the slide groove will drive the block to move until the position of the block corresponds to the position of the slot on the first connecting block. The block will automatically move into the slot under the action of the air pressure, thereby ensuring the overall stability of the insulation pipe and solving the problem that the existing insulation pipe cannot realize the automatic clamping function by utilizing the air pressure change in the docking area after docking. The insulation pipe can be automatically clamped after docking the insulation pipes, thereby enhancing the convenience of using the insulation pipe.

[0017] 3. Through the setting of the connecting component, the sealing ring on the connecting component and the third connecting pipe can slide on the outside of the first connecting pipe. When the position of the third connecting pipe corresponds to the position of the through hole, the through hole can be inflated through the air nozzle, so that the card block on the docking component is detached from the card slot, thereby realizing rapid disassembly and enhancing the practicality of the insulation pipe.

[0018] 4. By setting up the connecting pipe and the winding pipe, the hot air in the insulation pipe can be introduced into the winding pipe. Since the winding pipe is arranged around the outside of the first connecting pipe and the second connecting pipe, the winding pipe can be supported by the support block. The winding pipe supports the first connecting pipe and the second connecting pipe, which can not only realize the supporting function, but also preheat the outer space of the insulation pipe, thereby solving the problem that the existing insulation pipe cannot use hot air to realize the preheating function of the outer space of the insulation pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in combination with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them: Figure 1 It is a schematic diagram of the overall structure of a prefabricated direct-buried thermal insulation pipe of the present invention; Figure 2 It is a schematic diagram of the connection structure of the first connecting pipe and the second connecting pipe of the present invention; Figure 3 yes Figure 2 A magnified schematic diagram of the structure at center A; Figure 4 yes Figure 2 A magnified schematic diagram of the structure at B in the middle; Figure 5 yes Figure 2 A magnified schematic diagram of the structure at C in the middle; Figure 6 Yes Yes Figure 2 A magnified schematic diagram of the structure at D in the middle; Figure 7 It is a schematic diagram of the connection structure between the first connection block and the card block of the present invention; Figure 8 It is a schematic diagram of the connection structure of the first inner tube and the second inner tube of the present invention; Fig. 9 yes Figure 8 A magnified schematic diagram of the structure at E in the middle; Fig.10 yes Figure 8 A magnified schematic diagram of the structure at F in the middle; Fig.11 It is a schematic diagram of the connection structure of the winding tube and the support block of the present invention; Fig.12 yes Fig.11 A magnified schematic diagram of the structure at H in the middle; Fig.13 It is a schematic diagram of the connection structure of the first thermal insulation layer and the second thermal insulation layer of the present invention; Fig.14 yes Fig.13 A magnified schematic diagram of the structure at G in the middle.

[0020] Figure numerals: 1, first connecting pipe; 2, second connecting pipe; 3, first insulation layer; 4, second insulation layer; 5, first inner tube; 6, second inner tube; 7, docking groove; 8, docking block; 9, first mounting groove; 10, first connecting block; 11, clamping groove; 12, through hole; 13, groove; 14, damping ring; 15, docking assembly; 1501, first connecting groove; 1502, second connecting groove; 1503, clamping block; 1504, slider; 1505, slide groove; 16, connecting pipe; 17, winding pipe; 18, support block; 19, connecting assembly; 1901, third connecting pipe; 1902, sealing ring; 1903, rubber block; 1904, cross cut. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0024] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1-Figure 14As shown, a prefabricated direct-buried insulated pipe includes a first connecting pipe 1, a first insulation layer 3 is fixedly connected to the first connecting pipe 1, a first inner pipe 5 is fixedly connected to the first insulation layer 3, a docking groove 7 is opened on the first insulation layer 3, a docking block 8 is installed in the docking groove 7, and a second insulation layer 4 is fixedly connected to the docking block 8. When there is a height difference between the bottom supporting positions of the first connecting pipe 1 and the second connecting pipe 2, the docking block 8 will slide in the docking groove 7, thereby compensating for the height difference between the first connecting pipe 1 and the second connecting pipe 2. The second inner tube 6 and the second connecting tube 2 are fixedly connected to the inner and outer sides of the second thermal insulation layer 4 respectively, the first thermal insulation layer 3 is fixedly connected to the first connecting block 10, the second thermal insulation layer 4 is provided with a first mounting groove 9 for docking with the first connecting block 10, the second thermal insulation layer 4 is provided with a docking assembly 15, the first connecting block 10 is provided with a card slot 11, the first connecting block 10, the first thermal insulation layer 3 and the first connecting tube 1 are all provided with through holes 12 that are interconnected, the tops of the first connecting tube 1 and the second connecting tube 2 are both connected with a connecting tube 16, the top of the connecting tube 16 is connected with a winding tube 17, both ends of the winding tube 17 are fixedly provided with support blocks 18, and the outer side of the first connecting tube 1 is installed with a connecting assembly 19. According to the required laying length of the insulation pipe, multiple groups of first connecting pipes 1 and second connecting pipes 2 are butted end to end, and the first connecting block 10 on the first insulation layer 3 is installed into the first installation groove 9 in the first insulation layer 3. The first connecting block 10 will increase the air pressure in the first installation groove 9 during the movement, so that the first connecting block 10 will automatically dock with the second insulation layer 4 through the docking component 15 and the first installation groove 9. Subsequently, the connection component 19 on the first connecting pipe 1 can be moved to the position of the through hole 12, and the air pressure in the through hole 12 is increased so that the first connecting block 10 will no longer dock with the second insulation layer 4. The winding pipe 17 is supported by the support block 18, and the winding pipe 17 supports the first connecting pipe 1 and the second connecting pipe 2. Hot air enters the winding pipe 17 through the connecting pipe 16 to heat the external space of the first connecting pipe 1 and the second connecting pipe 2.

[0026] In this embodiment, the central axes of the first connecting tube 1, the second connecting tube 2, the first insulation layer 3, the second insulation layer 4, the first inner tube 5 and the second inner tube 6 are all collinear to ensure the overall stability of the insulation tube. The length of the second inner tube 6 that contracts inwardly at the rear side of the second insulation layer 4 is equal to the length of the first inner tube 5 that protrudes outwardly at the front side of the first insulation layer 3. The first inner tube 5 and the second inner tube 6 are interconnected with the interior of the winding tube 17 through the connecting tube 16. The high-temperature gas in the first inner tube 5 and the second inner tube 6 can enter the winding tube 17 through the connecting tube 16, so that the external space of the first inner tube 5 and the second inner tube 6 can be preheated, thereby improving the ambient temperature and enhancing the antifreeze effect.

[0027] In this embodiment, the first connecting tube 1, the first insulation layer 3 and the first inner tube 5 are fixedly connected as an integral structure, and the second connecting tube 2, the second insulation layer 4 and the second inner tube 6 are fixedly connected as an integral structure. The first insulation layer 3 and the second insulation layer 4 are used to reduce the heat loss in the insulation tube. The front surfaces of the second connecting tube 2, the second insulation layer 4 and the second inner tube 6 are in contact with the rear surfaces of the first connecting tube 1, the first insulation layer 3 and the first inner tube 5 to ensure the overall sealing effect of the insulation tube.

[0028] In this embodiment, the diameter of the front half of the docking block 8 is larger than the diameter of the rear half of the docking block 8, the length of the docking block 8 is equal to the depth of the docking groove 7, and there is a gap between the docking block 8 and the docking groove 7. The docking block 8 can move left and right or up and down in the docking groove 7, but cannot move forward and backward, thereby adapting to the height difference between the support positions on the front and rear sides of the insulation pipe, and ensuring the overall sealing effect of the insulation pipe, thereby enhancing the adaptability of the insulation pipe.

[0029] In this embodiment, the docking blocks 8 are evenly distributed along the circumference of the second insulation layer 4, and the docking grooves 7 are evenly distributed along the circumference of the first insulation layer 3. The positions and number of the docking blocks 8 correspond one-to-one to the positions and number of the docking grooves 7, ensuring that multiple positions of the insulation pipe can be moved up and down or left and right, so that the height of the insulation pipe can be adjusted later according to the support position of the insulation pipe.

[0030] In this embodiment, a groove 13 is provided on the first connecting block 10, and a damping ring 14 is fixedly connected in the groove 13. The cross-section of the damping ring 14 is a semicircular structure. The radius of the semicircle of the cross-section of the damping ring 14 is greater than the depth of the groove 13. The groove 13 is annular, and the annular groove 13 is used to place the damping ring 14. The damping ring 14 can remain sealed during the sliding of the first connecting block 10, so that the air pressure can be used to achieve the docking function of adjacent insulation pipes later.

[0031] In this embodiment, one end of the through hole 12 extends to the inner wall of the slot 11 on the first connecting block 10, and the other end of the through hole 12 extends to the outside of the first connecting tube 1. The through hole 12 facilitates changing the air pressure in the device from the outside of the first connecting tube 1, thereby allowing the two adjacent insulation tubes to be out of the docking state.

[0032] In this embodiment, the docking assembly 15 includes a first connecting groove 1501, a second connecting groove 1502 and a slide groove 1505 which are provided in the first insulation layer 3. A slider 1504 is slidably installed in the slide groove 1505. A block 1503 is fixedly connected to the slider 1504. The first installation groove 9, the first connecting groove 1501 and the second connecting groove 1502 are connected to each other. The block 1503 is adapted to move into the slot 11 in the first connecting block 10 when the first connecting block 10 moves into the first installation groove 9. The front side of 10 is a conical structure. When the first connecting block 10 slides in the first mounting groove 9, the side surface of the conical body on the first connecting block 10 will press against the block 1503, and the air pressure in the first mounting groove 9, the first connecting groove 1501 and the second connecting groove 1502 will increase. When the position of the block 1503 corresponds to the position of the slot 11, under the action of the air pressure in the first mounting groove 9, the slider 1504 in the slide groove 1505 will drive the block 1503 to move into the slot 11, thereby completing the docking function of the two adjacent groups of insulation pipes.

[0033] In this embodiment, the connection component 19 includes a sealing ring 1902 that is fitted on the outside of the first connecting tube 1, and a third connecting tube 1901 is fixedly connected to the sealing ring 1902. A rubber block 1903 is installed on the third connecting tube 1901, and a cross slit 1904 is provided in the middle of the rubber block 1903. After the third connecting tube 1901 is moved to a suitable position, the sealing ring 1902 can maintain the sealing state of the third connecting tube 1901, and the cross slit 1904 in the middle of the rubber block 1903 is used to connect an external air pump to change the air pressure in the device, thereby changing the docking state of the two adjacent insulation tubes.

[0034] It should be noted that the present invention is a prefabricated direct buried thermal insulation pipe and a method of using the same. First, Figure 1-Figure 9 As shown, according to the required laying length of the insulation pipe, multiple groups of first connecting pipes 1 and second connecting pipes 2 are connected end to end, and the first connecting block 10 on the first insulation layer 3 is installed into the first installation groove 9 in the first insulation layer 3. The first connecting block 10 will increase the air pressure in the first installation groove 9 during the movement. After the air pressure in the first installation groove 9 increases, the first connecting block 10 is automatically docked with the second insulation layer 4 through the docking assembly 15 and the first installation groove 9. When the first connecting block 10 slides in the first installation groove 9, the side of the frustum on the first connecting block 10 will press against the block 1503. The air pressure in the first installation groove 9, the first connecting groove 1501 and the second connecting groove 1502 increases. When the position of the block 1503 corresponds to the position of the slot 11, under the action of the air pressure in the first installation groove 9, the slider 1504 in the slide groove 1505 will drive the block 1503 to move into the slot 11, completing the docking function of the two adjacent groups of insulation pipes. The first connecting block 10 and the first installation groove 9 are both provided with multiple ones along the circumference of the insulation pipe to ensure the docking effect of the insulation pipe.

[0035] like Fig.13 and Fig.14 As shown, when the docking state needs to be cancelled later, the connection component 19 on the first connecting pipe 1 can be moved to the position of the through hole 12, and the air pressure in the through hole 12 is increased so that the first connecting block 10 is no longer docked with the second insulation layer 4. When the third connecting pipe 1901 is moved to a suitable position, the sealing ring 1902 can maintain the sealing state of the third connecting pipe 1901, and the cross slit 1904 in the middle of the rubber block 1903 is used to connect an external air pump to inflate the through hole 12, change the air pressure in the slot 11, and make the block 1503 retract into the second connecting slot 1502, thereby changing the docking state of the two adjacent insulation pipes. Figure 8-Figure 12 As shown, when the insulation pipe is laid, the winding pipe 17 can be supported by the support block 18, and the first connecting pipe 1 and the second connecting pipe 2 can be supported by the winding pipe 17. Hot air can enter the winding pipe 17 through the connecting pipe 16 to heat the external space of the first connecting pipe 1 and the second connecting pipe 2. When there is a height difference between the bottom support positions of the first connecting pipe 1 and the second connecting pipe 2, the docking block 8 will slide in the docking groove 7 to make up for the height difference between the first connecting pipe 1 and the second connecting pipe 2.

[0036] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A prefabricated direct-buried thermal insulation pipe, comprising a first connecting pipe (1), characterized in that: The first connecting pipe (1) is fixedly connected to a first thermal insulation layer (3), the first thermal insulation layer (3) is fixedly connected to a first inner pipe (5), the first thermal insulation layer (3) is provided with a docking groove (7), a docking block (8) is installed in the docking groove (7), the docking block (8) is fixedly connected to a second thermal insulation layer (4), the second thermal insulation layer (4) is fixedly connected to a second inner pipe (6) and a second connecting pipe (2) at its inner and outer sides, respectively, the first thermal insulation layer (3) is fixedly connected to a first connecting block (10), the second thermal insulation layer (4) is provided with a first mounting block (8) for docking with the first connecting block (10), and the second thermal insulation layer (4) is provided with a first mounting block (9) for docking with the first connecting block (10). A mounting groove (9), a docking assembly (15) is arranged in the second thermal insulation layer (4), a clamping groove (11) is opened on the first connection block (10), the first connection block (10), the first thermal insulation layer (3) and the first connection pipe (1) are all provided with mutually communicating through holes (12), the tops of the first connection pipe (1) and the second connection pipe (2) are both connected with a connecting pipe (16), the top of the connecting pipe (16) is connected with a winding pipe (17), both ends of the winding pipe (17) are fixedly provided with support blocks (18), and a connection assembly (19) is installed on the outer side of the first connection pipe (1).

2. The prefabricated direct buried thermal insulation pipe according to claim 1, characterized in that: The central axes of the first connecting tube (1), the second connecting tube (2), the first thermal insulation layer (3), the second thermal insulation layer (4), the first inner tube (5) and the second inner tube (6) are all collinear; the length of the second inner tube (6) contracted inwardly at the rear side of the second thermal insulation layer (4) is equal to the length of the first inner tube (5) protruding outwardly at the front side of the first thermal insulation layer (3); the first inner tube (5) and the second inner tube (6) are connected to each other through the connecting tube (16) and the interior of the winding tube (17).

3. The prefabricated direct buried thermal insulation pipe according to claim 1, characterized in that: The first connecting tube (1), the first thermal insulation layer (3) and the first inner tube (5) are fixedly connected to form an integral structure, and the second connecting tube (2), the second thermal insulation layer (4) and the second inner tube (6) are fixedly connected to form an integral structure, and the front surfaces of the second connecting tube (2), the second thermal insulation layer (4) and the second inner tube (6) are in contact with the rear surfaces of the first connecting tube (1), the first thermal insulation layer (3) and the first inner tube (5).

4. The prefabricated direct buried thermal insulation pipe according to claim 1, characterized in that: The diameter of the front half of the docking block (8) is greater than the diameter of the rear half of the docking block (8), the length of the docking block (8) is equal to the depth of the docking groove (7), and there is a gap between the docking block (8) and the docking groove (7).

5. The prefabricated direct-buried thermal insulation pipe according to claim 4, characterized in that: The docking blocks (8) are evenly distributed along the circumference of the second thermal insulation layer (4), and the docking grooves (7) are evenly distributed along the circumference of the first thermal insulation layer (3), and the positions and number of the docking blocks (8) correspond to the positions and number of the docking grooves (7) in a one-to-one manner.

6. The prefabricated direct-buried thermal insulation pipe according to claim 1, characterized in that: The first connection block (10) is provided with a groove (13), a damping ring (14) is fixedly connected in the groove (13), the cross section of the damping ring (14) is a semicircular structure, the radius of the semicircle of the cross section of the damping ring (14) is greater than the depth of the groove (13), and the groove (13) is annular.

7. The prefabricated direct-buried thermal insulation pipe according to claim 1, characterized in that: One end of the through hole (12) extends to the inner wall of the clamping groove (11) on the first connection block (10), and the other end of the through hole (12) extends to the outside of the first connection pipe (1).

8. The prefabricated direct-buried thermal insulation pipe according to claim 1, characterized in that: The docking assembly (15) comprises a first connecting groove (1501), a second connecting groove (1502) and a slide groove (1505) which are provided in the first thermal insulation layer (3); a slider (1504) is slidably installed in the slide groove (1505); a clamping block (1503) is fixedly connected to the slider (1504); the first installation groove (9), the first connecting groove (1501) and the second connecting groove (1502) are interconnected; the clamping block (1503) is adapted to move into the clamping groove (11) in the first connecting block (10) when the first connecting block (10) moves into the first installation groove (9); and the front side of the first connecting block (10) is a truncated cone structure.

9. The prefabricated direct-buried thermal insulation pipe according to claim 1, characterized in that: The connection assembly (19) comprises a sealing ring (1902) fitted on the outside of the first connecting tube (1), the sealing ring (1902) being fixedly connected to a third connecting tube (1901), a rubber block (1903) being mounted on the third connecting tube (1901), and a cross slit (1904) being provided in the middle of the rubber block (1903).

10. A method for using a prefabricated direct-buried thermal insulation pipe, using the prefabricated direct-buried thermal insulation pipe according to claim 1, characterized in that: The following steps are involved: S1: according to the required length of the insulation pipe to be laid, multiple groups of first connecting pipes (1) and second connecting pipes (2) are butted end to end, and a first connecting block (10) on the first insulation layer (3) is installed into a first installation groove (9) in the first insulation layer (3). The first connecting block (10) increases the air pressure in the first installation groove (9) during the movement process; S2: After the air pressure in the first installation groove (9) increases, the first connection block (10) is automatically connected to the second insulation layer (4) through the connection assembly (15) and the first installation groove (9). When the connection state needs to be cancelled later, the connection assembly (19) on the first connection pipe (1) can be moved to the position of the through hole (12), and the air pressure in the through hole (12) is increased, so that the first connection block (10) is no longer connected to the second insulation layer (4); S3: When the thermal insulation pipe is laid, the winding pipe (17) can be supported by the support block (18), and the first connecting pipe (1) and the second connecting pipe (2) can be supported by the winding pipe (17), and hot air can enter the winding pipe (17) through the connecting pipe (16) to heat the external space of the first connecting pipe (1) and the second connecting pipe (2); S4: When there is a height difference between the bottom support positions of the first connecting tube (1) and the second connecting tube (2), the docking block (8) will slide in the docking groove (7), thereby compensating for the height difference between the first connecting tube (1) and the second connecting tube (2).

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