A prefabricated directly buried thermal insulation pipe and its usage method

Abstract

The present application provides a prefabricated directly buried insulating pipe and its usage method, belonging to the technical field of insulating pipes. It includes a first connecting pipe, on which a first insulating layer is fixedly connected. A first inner pipe is fixedly connected to the first insulating layer. A docking groove is formed in the first insulating layer, and a docking block is installed in the docking groove. A second insulating layer is fixedly connected to the docking block. A second inner pipe and a second connecting pipe are respectively fixedly connected to the inner and outer sides of the second insulating layer. A first connecting block is fixedly connected to the first insulating layer, and a first installation groove for docking with the first connecting block is formed in the second insulating layer. The present application solves the problems that the existing insulating pipes cannot make up for height differences while maintaining the sealing effect, cannot achieve the function of automatic clamping by using the air pressure change in the docking area after docking, and cannot use hot air to preheat the space outside the insulating pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal insulation pipes, and specifically to a prefabricated directly buried thermal insulation pipe and its usage method. Background Art

[0002] Prefabricated directly buried thermal insulation pipes are a kind of pipe system widely used in industries such as heat transfer, heating, hot water supply, and petroleum and chemical industries. It mainly consists of three parts: a steel pipe, a thermal insulation layer, and an outer protective pipe. Among them, the steel pipe is used to carry fluids, the thermal insulation layer plays a role in reducing heat loss and maintaining heat energy, and the outer protective pipe protects the thermal insulation layer from the influence of the external environment, ensuring the safety and stability of the entire system. However, there are still some deficiencies in the existing thermal insulation pipes.

[0003] The invention patent with the publication number CN113790583A discloses a prefabricated directly buried thermal insulation pipe, including a pre-buried installation frame. At the center of the interior of the pre-buried installation frame, there is a fixed connection with an annular protective plate for supporting the thermal insulation pipe. Inside the annular protective plate, there is a clamping seat with a separating function. Inside the annular protective plate, there is installed a thermal insulation pipe seat. Inside the thermal insulation pipe seat, there is a thermal insulation cotton with a thermal insulation function. On the surface of the thermal insulation pipe seat and inside the annular protective plate, there is a movable connection with an adding mechanism with an adding function. Inside the pre-buried installation frame, there is installed a recycling seat with a placing function. The pre-buried installation frame includes connecting support seats, and the number of connecting support seats is three. When in use, it achieves the effect of automatically absorbing moisture from the thermal insulation cotton according to the self-change of the external environment, avoiding the problem that the thermal insulation cotton is affected by excessive moisture and affecting its own use. Although the above pipeline can achieve the moisture-proof function, when there is a height difference between the bottom support structures of two pipelines, the existing thermal insulation pipelines cannot make up for the height difference while maintaining the sealing effect, and the existing thermal insulation pipelines cannot achieve the function of automatically clamping by using the air pressure change in the docking area after docking, nor can they use hot air to preheat the peripheral space of the pipeline. 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 directly buried insulating pipe, comprising a first connecting pipe, a first insulating layer is fixedly connected to the first connecting pipe, a first inner pipe is fixedly connected to the first insulating layer, a docking groove is formed in the first insulating layer, a docking block is installed in the docking groove, a second insulating layer is fixedly connected to the docking block, a second inner pipe and a second connecting pipe are respectively fixedly connected to the inner and outer sides of the second insulating layer, a first connecting block is fixedly connected to the first insulating layer, a first installation groove for docking with the first connecting block is formed in the second insulating layer, a docking component is arranged in the second insulating layer, a clamping groove is formed in the first connecting block, through holes that communicate with each other are arranged in the first connecting block, the first insulating layer and the first connecting pipe, communicating pipes are communicated at the tops of the first connecting pipe and the second connecting pipe, a winding pipe is communicated above the communicating pipes, support blocks are fixedly arranged at both ends of the winding pipe, and an engagement component 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 pipe, the second connecting pipe, the first insulating layer, the second insulating layer, the first inner pipe and the second inner pipe are all collinear. The length of the second inner pipe that contracts inward at the rear side of the second insulating layer is equal to the length of the first inner pipe that protrudes outward at the front side of the first insulating layer. The first inner pipe and the second inner pipe are internally communicated with each other through the communicating pipe and the winding pipe.

[0007] As a preferred solution of the present invention, the first connecting pipe, the first insulating layer and the first inner pipe are fixedly connected as an integral structure, the second connecting pipe, the second insulating layer and the second inner pipe are fixedly connected as an integral structure, and the front surfaces of the second connecting pipe, the second insulating layer and the second inner pipe are mutually attached to the rear surfaces of the first connecting pipe, the first insulating layer and the first inner pipe.

[0008] As a preferred solution of the present invention, the diameter of the front half part of the docking block is larger than the diameter of the rear half part of the docking block. The length of the docking block is equal to the depth of the docking groove. 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 circumferential direction of the second insulating layer, the docking grooves are evenly distributed along the circumferential direction of the first insulating layer, and the positions and numbers of the docking blocks correspond to the positions and numbers of the docking grooves one by one.

[0010] As a preferred solution of the present invention, a groove is formed in the first connecting block, a damping ring is fixedly connected in the groove, the cross section of the damping ring is a semi-circular structure, the radius of the semi-circle of the cross section of the damping ring is larger than the depth of the groove, and the groove is circular.

[0011] As a preferred embodiment of the present invention, one end of the through hole extends to the inner wall of the upper clamping groove of the first connection block, and the other end of the through hole extends to the outside of the first connection pipe.

[0012] As a preferred embodiment of the present invention, the docking assembly includes a first communication groove, a second communication groove and a sliding groove formed in the first heat insulation layer. A slider is slidably installed in the sliding groove, and a clamping block is fixedly connected to the slider. The first installation groove, the first communication groove and the second communication groove communicate with each other. The clamping block is adapted to move into the clamping groove in the first connection block when the first connection block moves into the first installation groove. The front side of the first connection block is a frustum structure.

[0013] As a preferred embodiment of the present invention, the connection assembly includes a sealing ring fittingly arranged on the outside of the first connection pipe. A third connection pipe is fixedly connected to the sealing ring, and a rubber block is installed on the third connection pipe. A cross cut is provided in the middle of the rubber block.

[0014] A method for using a prefabricated directly buried heat-insulated pipe includes the following steps:

[0015] S1: According to the required laying length of the heat-insulated pipe, a plurality of groups of first connection pipes and second connection pipes are butt-connected end to end. The first connection block on the first heat insulation layer is installed into the first installation groove in the first heat insulation layer. When the first connection block moves, the air pressure in the first installation groove will increase;

[0016] S2: After the air pressure in the first installation groove increases, the first connection block automatically docks with the second heat insulation layer through the docking assembly and the first installation groove. When it is necessary to cancel the docking state later, the connection assembly on the first connection pipe can be moved to the position of the through hole, and by increasing the air pressure in the through hole, the first connection block will no longer dock with the second heat insulation layer;

[0017] S3: When the heat-insulated pipe is laid, the winding pipe can be supported by the support block, and the first connection pipe and the second connection pipe can be supported by the winding pipe. Hot air can enter the winding pipe through the communication pipe to heat the external space of the first connection pipe and the second connection pipe;

[0018] S4: When there is a height difference at the bottom support position of the first connection pipe and the second connection pipe, the docking block will slide in the docking groove to make up for the height difference between the first connection pipe and the second connection pipe.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The depth of the docking groove on the heat preservation pipe is the same as the length of the docking block, but there is a gap between the docking groove and the docking block, enabling the first connecting pipe, the first heat preservation layer, and the first inner pipe to move relative to the second connecting pipe, the second heat preservation layer, and the second inner pipe. Moreover, the overall sealing effect can be maintained, adapting to the docking of two groups of heat preservation pipes with different height differences, enhancing the adaptability of the heat preservation pipe, and solving the problem that existing heat preservation pipes cannot compensate for height differences while maintaining the sealing effect. This heat preservation pipe has the advantage of stronger applicability.

[0021] 2. Through the set first installation groove, first connecting block, and docking component, when the first connecting block is installed into the inside of the first installation groove, the air pressure in the first installation groove, the first communication groove, and the second communication groove increases. The slider in the sliding groove drives the clamping block to move until the position of the clamping block corresponds to the position of the clamping groove on the first connecting block. The clamping block will automatically move into the clamping groove under the action of air pressure, thus ensuring the overall stability of the heat preservation pipe and solving the problem that existing heat preservation pipes cannot achieve an automatic clamping function by utilizing the air pressure change in the docking area after docking. This heat preservation pipe can automatically clamp after docking two heat preservation pipes, enhancing the convenience during the use of the heat preservation pipe.

[0022] 3. Through the set connection component, the sealing ring and the third connecting pipe on the connection component 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, air can be inflated into the through hole through the air nozzle, causing the clamping block on the docking component to disengage from the clamping groove, thereby achieving rapid disassembly work and enhancing the practicality of the heat preservation pipe.

[0023] 4. Through the set connecting pipe and winding pipe, the hot air inside the heat preservation 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, and the winding pipe supports the first connecting pipe and the second connecting pipe. This not only realizes the support function but also preheats the space outside the heat preservation pipe, solving the problem that existing heat preservation pipes cannot utilize hot air to preheat the space outside the heat preservation pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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 conjunction with the drawings and detailed embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Among them:

[0025] Figure 1 is a schematic diagram of the overall structure of a prefabricated directly buried heat preservation pipe of the present invention;

[0026] Figure 2Schematic diagram of the connection structure of the first connecting pipe and the second connecting pipe of the present invention;

[0027] Figure 3 is Figure 2 Enlarged schematic diagram of the structure at position A in;

[0028] Figure 4 is Figure 2 Enlarged schematic diagram of the structure at position B in;

[0029] Figure 5 is Figure 2 Enlarged schematic diagram of the structure at position C in;

[0030] Figure 6 is is Figure 2 Enlarged schematic diagram of the structure at position D in;

[0031] Figure 7 Schematic diagram of the connection structure of the first connecting block and the clamping block of the present invention;

[0032] Figure 8 Schematic diagram of the connection structure of the first inner pipe and the second inner pipe of the present invention;

[0033] Figure 9 is Figure 8 Enlarged schematic diagram of the structure at position E in;

[0034] Figure 10 is Figure 8 Enlarged schematic diagram of the structure at position F in;

[0035] Figure 11 Schematic diagram of the connection structure of the winding pipe and the support block of the present invention;

[0036] Figure 12 is Figure 11 Enlarged schematic diagram of the structure at position H in;

[0037] Figure 13 Schematic diagram of the connection structure of the first heat insulation layer and the second heat insulation layer of the present invention;

[0038] Figure 14 is Figure 13 Enlarged schematic diagram of the structure at position G in.

[0039] Reference numerals: 1, first connecting pipe; 2, second connecting pipe; 3, first thermal insulation layer; 4, second thermal insulation layer; 5, first inner pipe; 6, second inner pipe; 7, docking groove; 8, docking block; 9, first installation groove; 10, first connecting block; 11, clamping groove; 12, through hole; 13, groove; 14, damping ring; 15, docking assembly; 1501, first communication groove; 1502, second communication groove; 1503, clamping block; 1504, slider; 1505, sliding groove; 16, communicating pipe; 17, winding pipe; 18, support block; 19, connection assembly; 1901, third connecting pipe; 1902, sealing ring; 1903, rubber block; 1904, cross cut. Detailed implementation manners

[0040] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given in conjunction with the accompanying drawings.

[0041] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementation manners disclosed below.

[0042] Secondly, the present invention will be described in detail with reference to the schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally out of the general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0043] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following will further describe the embodiments of the present invention in detail in conjunction with the accompanying drawings.

[0044] Such as Figures 1-14As 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.

[0045] 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.

[0046] In this embodiment, the first connecting pipe 1, the first heat insulation layer 3, and the first inner pipe 5 are fixedly connected as an integral structure, and the second connecting pipe 2, the second heat insulation layer 4, and the second inner pipe 6 are fixedly connected as an integral structure. The first heat insulation layer 3 and the second heat insulation layer 4 are used to reduce the heat loss in the heat insulation pipe. The front surface of the second connecting pipe 2, the second heat insulation layer 4, and the second inner pipe 6 is mutually attached to the rear surface of the first connecting pipe 1, the first heat insulation layer 3, and the first inner pipe 5 to ensure the overall sealing effect of the heat insulation pipe.

[0047] In this embodiment, the diameter of the front half of the docking block 8 is larger than that 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. 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, so as to adapt to the height difference of the support positions on the front and rear sides of the heat insulation pipe, and ensure the overall sealing effect of the heat insulation pipe, enhancing the adaptability of the heat insulation pipe.

[0048] In this embodiment, the docking blocks 8 are evenly distributed along the circumferential direction of the second heat insulation layer 4, and the docking grooves 7 are evenly distributed along the circumferential direction of the first heat insulation layer 3. The positions and quantities of the docking blocks 8 correspond one by one to the positions and quantities of the docking grooves 7, ensuring that the heat insulation pipe can move up and down or left and right at multiple positions, so as to adjust the height of the heat insulation pipe according to the support position of the heat insulation pipe subsequently.

[0049] 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 semi-circular structure. The radius of the semi-circle of the cross-section of the damping ring 14 is larger than the depth of the groove 13. The groove 13 is circular. The annular groove 13 is used to place the damping ring 14. The damping ring 14 can maintain sealing during the sliding process of the first connecting block 10, so as to realize the docking function of adjacent heat insulation pipes by using air pressure subsequently.

[0050] In this embodiment, one end of the through hole 12 extends to the inner wall of the clamping groove 11 on the first connecting block 10, and the other end of the through hole 12 extends to the outside of the first connecting pipe 1. The through hole 12 facilitates changing the air pressure inside the device from the outside of the first connecting pipe 1, so that the adjacent two heat insulation pipes are separated from the docking state.

[0051] In this embodiment, the docking assembly 15 includes a first communication groove 1501, a second communication groove 1502, and a sliding groove 1505 formed in the first heat insulation layer 3. A slider 1504 is slidably installed in the sliding groove 1505, and a clamping block 1503 is fixedly connected to the slider 1504. The first installation groove 9, the first communication groove 1501, and the second communication groove 1502 communicate with each other. The clamping block 1503 is adapted to move into the clamping groove 11 in the first connection block 10 when the first connection block 10 moves into the first installation groove 9. The front side of the first connection block 10 is a frustum structure. When the first connection block 10 slides in the first installation groove 9, the frustum side surface on the first connection block 10 will abut against the clamping block 1503, increasing the air pressure in the first installation groove 9, the first communication groove 1501, and the second communication groove 1502. When the position of the clamping block 1503 corresponds to the position of the clamping groove 11, under the action of the air pressure in the first installation groove 9, the slider 1504 in the sliding groove 1505 will drive the clamping block 1503 to move into the clamping groove 11, completing the docking function of two adjacent heat insulation pipes.

[0052] In this embodiment, the connection assembly 19 includes a sealing ring 1902 attached to the outside of the first connection pipe 1. A third connection pipe 1901 is fixedly connected to the sealing ring 1902. A rubber block 1903 is installed on the third connection pipe 1901, and a cross slit 1904 is provided in the middle of the rubber block 1903. After the third connection pipe 1901 moves to a suitable position, the sealing ring 1902 can maintain the sealing state of the third connection pipe 1901. The external air pump is connected by using the cross slit 1904 in the middle of the rubber block 1903 to change the air pressure in the device, thereby changing the docking state of two adjacent heat insulation pipes.

[0053] It should be noted that the present invention is a prefabricated directly buried heat insulation pipe and its usage method. First, as Figures 1-9 shown, according to the required laying length of the heat insulation pipe, multiple groups of first connection pipes 1 and second connection pipes 2 are butt-connected end to end. The first connection block 10 on the first heat insulation layer 3 is installed into the first installation groove 9 in the first heat insulation layer 3. When the first connection block 10 moves, the air pressure in the first installation groove 9 will increase. After the air pressure in the first installation groove 9 increases, the first connection block 10 automatically docks with the second heat insulation layer 4 through the docking assembly 15 and the first installation groove 9. When the first connection block 10 slides in the first installation groove 9, the frustum side surface on the first connection block 10 will abut against the clamping block 1503, increasing the air pressure in the first installation groove 9, the first communication groove 1501, and the second communication groove 1502. When the position of the clamping block 1503 corresponds to the position of the clamping groove 11, under the action of the air pressure in the first installation groove 9, the slider 1504 in the sliding groove 1505 will drive the clamping block 1503 to move into the clamping groove 11, completing the docking function of two adjacent heat insulation pipes. Both the first connection block 10 and the first installation groove 9 are provided with multiple ones along the circumferential direction of the heat insulation pipe to ensure the docking effect of the heat insulation pipe.

[0054] As Figure 13 and Figure 14 shown, when it is necessary to cancel the docking state subsequently, the connection component 19 on the first connecting pipe 1 can be moved to the position of the through hole 12, and by increasing the air pressure in the through hole 12, the first connecting block 10 is no longer docked with the second heat 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, connect an external air pump by using the cross slit 1904 in the middle of the rubber block 1903, inflate the through hole 12, change the air pressure inside the clamping groove 11, so that the clamping block 1503 retracts into the inside of the second communication groove 1502, thereby changing the docking state of the adjacent two heat insulation pipes. As Figures 8-12 shown, when laying the heat insulation pipe, 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 communication 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 at 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, so as to make up for the height difference between the first connecting pipe 1 and the second connecting pipe 2.

[0055] Although the present invention has been described above with reference to the embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in the present invention can be combined with each other in any way, and the situations of these combinations are not exhaustively described in this specification only for the consideration of saving space and resources. Therefore, the present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A prefabricated directly buried thermal insulation pipe, comprising a first connecting pipe (1), characterized in that: The first connecting pipe (1) is fixedly connected to a first insulating layer (3), the first insulating layer (3) is fixedly connected to a first inner pipe (5), the first insulating 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 insulating layer (4), the second insulating 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 insulating layer (3) is fixedly connected to a first connecting block (10), the second insulating layer (4) is provided with a first mounting groove (9) for docking with the first connecting block (10), a docking assembly (15) is arranged in the second insulating layer (4), a clamping groove (11) is provided on the first connecting block (10), the first connecting block (10), the first insulating layer (3) and the first connecting pipe (1) are all provided with through holes (12) that are interconnected, the tops of the first connecting pipe (1) and the second connecting pipe (2) are both connected A connecting pipe (16) is provided, a winding pipe (17) is provided above the connecting pipe (16), support blocks (18) are fixedly provided at both ends of the winding pipe (17), and a connecting assembly (19) is installed on the outer side of the first connecting pipe (1); the through hole (12) is connected to the card slot (11); the docking assembly (15) comprises a first connecting slot (1501), a second connecting slot (1502) and a slide slot (1505) which are provided in the first thermal insulation layer (3); the A slider (1504) is slidably mounted in the slide groove (1505), and a clamping block (1503) is fixedly connected to the slider (1504). The first mounting groove (9), the first connecting groove (1501) and the second connecting groove (1502) are connected to each other. The clamping block (1503) is suitable for moving into the clamping groove (11) in the first connecting block (10) when the first connecting block (10) moves into the first mounting groove (9). The front side of the first connecting block (10) is a truncated cone structure.

2. A prefabricated directly 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. A prefabricated directly buried insulating 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. A prefabricated directly 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 that 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. A prefabricated directly buried insulating pipe according to claim 4, characterized in that: The docking blocks (8) are evenly distributed along the circumferential direction of the second heat-insulating layer (4), and the docking grooves (7) are evenly distributed along the circumferential direction of the first heat-insulating layer (3). The positions and numbers of the docking blocks (8) correspond one by one to the positions and numbers of the docking grooves (7).

6. A prefabricated directly buried thermal insulation pipe according to claim 1, characterized in that: 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 semi-circular structure, and the radius of the semi-circle of the cross-section of the damping ring (14) is greater than the depth of the groove (13). The groove (13) is annular.

7. A prefabricated directly buried insulating 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 connecting block (10), and the other end of the through hole (12) extends to the outside of the first connecting pipe (1).

8. A prefabricated directly buried thermal insulation pipe according to claim 1, characterized in that: The connecting component (19) includes a sealing ring (1902) fittingly arranged on the outside of the first connecting pipe (1). A third connecting pipe (1901) is fixedly connected to the sealing ring (1902), and a rubber block (1903) is installed on the third connecting pipe (1901). A cross-shaped slit (1904) is provided in the middle of the rubber block (1903).

9. A method for using a prefabricated directly buried thermal insulation pipe, which uses a prefabricated directly buried thermal insulation pipe described in claim 1, characterized in that, It includes the following steps: S1: According to the required laying length of the heat-insulating pipe, a plurality of groups of first connecting pipes (1) and second connecting pipes (2) are butt-connected end to end. The first connecting blocks (10) on the first heat-insulating layer (3) are installed into the first installation grooves (9) in the first heat-insulating layer (3). When the first connecting blocks (10) move, the air pressure in the first installation grooves (9) will increase; S2: After the air pressure in the first installation grooves (9) increases, the first connecting blocks (10) are automatically docked with the second heat-insulating layer (4) through the docking component (15) and the first installation grooves (9). When it is necessary to cancel the docking state later, the connecting component (19) on the first connecting pipe (1) can be moved to the position of the through hole (12), and by increasing the air pressure in the through hole (12), the first connecting blocks (10) are no longer docked with the second heat-insulating layer (4); S3: When the heat-insulating pipe is being laid, the winding pipe (17) can be supported by the support blocks (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 communicating 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 at the bottom support positions of the first connecting pipe (1) and the second connecting pipe (2), the docking blocks (8) will slide in the docking grooves (7) to make up for the height difference between the first connecting pipe (1) and the second connecting pipe (2).

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