An underground buried pipe U-shaped joint

Abstract

The present invention belongs to the technical field of buried pipe joints, and specifically relates to a buried pipe U-shaped joint, which includes a joint body. Four circumferentially distributed flow guide covers are fixedly arranged on the upper part of the joint body. Three equally spaced water inlets are arranged on the upper part of the flow guide cover. A connection component for connecting with the buried pipe body is arranged on the upper part of the flow guide cover. A plurality of installation parts for connecting with an external bracket to support and position the joint body are arranged on the outer side of the joint body. When connecting the buried pipe body with the joint body in the present invention, by threadedly connecting the connecting pipe to the connectors at different positions of the flow guide cover, the position of the buried pipe body connected to the joint body can be flexibly adjusted. At the same time, the installation parts can be connected at appropriate positions on the outer side of the joint body according to the positions of different laying pits. Then, an external bracket is installed on the installation parts, and the joint body can be stably fixed at the center of the laying pit by using the external bracket, ensuring the connection and installation effect of the buried pipe body.

Description

Technical Field

[0001] The present invention relates to the technical field of buried pipe joints, and in particular, to a buried pipe U-shaped joint. Background Art

[0002] A buried pipe is a buried pipeline system buried underground. A buried pipe U-shaped joint is one of the common components of the buried pipeline system, which plays a key role in connecting the buried pipes and constructing a closed loop for the circulating medium, and its performance directly affects the operation stability of the buried pipeline system.

[0003] Currently, during the use process, the buried pipe U-shaped joint is usually connected to the buried pipe. However, there are still certain deficiencies in the existing buried pipe U-shaped joint during use: 1. The positions of the connectors on the existing U-shaped joint for connecting the buried pipes are mostly in a prefabricated fixed state and cannot be flexibly adjusted according to the actual construction scenario, resulting in the U-shaped joint being unable to be used because it cannot adapt to the spacing between the buried pipes; 2. When the U-shaped joint is placed in the dug laying pit, there is a lack of an effective centering support structure. It is easy to cause the U-shaped joint to deviate from the center position when placed in the laying pit due to the unevenness of the inner wall of the drilling hole, the uneven flow of the backfill material, or the external force during the pipe-laying process. The eccentricity of the U-shaped joint will cause the backfill material to be unevenly distributed around the pipeline, resulting in voids or areas with insufficient density, further ensuring the connection and installation effect of the buried pipe. Summary of the Invention

[0004] In view of the above problems, a buried pipe U-shaped joint provided by an embodiment of the present application can install the buried pipe body at a suitable position according to the requirements of different actual construction scenarios, and at the same time, can make the joint body be in a centered position when placed in the laying pit, ensuring the connection and installation effect of the buried pipe body.

[0005] To achieve the above object, the embodiment of the present application provides the following technical solution: The present invention provides a buried pipe U-shaped joint, including a joint body. Four circumferentially distributed flow guiding covers are fixedly arranged on the upper part of the joint body. Three equally spaced water inlets are arranged on the upper part of the flow guiding cover. A connecting component for connecting with the buried pipe body is arranged on the upper part of the flow guiding cover. A plurality of mounting parts for connecting with an external support to support and position the joint body are arranged on the outer side of the joint body.

[0006] The connecting component includes three connectors fixedly arranged on the upper part of the flow guiding cover and corresponding to the positions of the three water inlets one by one. A connecting pipe is threadedly arranged on the middle connector, and the connecting pipe is heat-melted and connected to the buried pipe body. Sealing caps for sealing are threadedly arranged on both side connectors.

[0007] The upper part of the joint body is provided with a positioning component for positioning the mounting part and the connecting component. The positioning component includes a threaded rod arranged on the upper part of the joint body. A moving part is arranged on the threaded rod. The bottom of the moving part is provided with a first positioning plate for positioning the mounting part. On both sides of the moving part close to the flow guide cover, there are respectively second positioning plates for positioning the connecting pipe and the sealing cover.

[0008] According to an advantageous embodiment, on the upper part of the flow guide cover and outside the water inlet, there is a first annular groove. A first sealing ring is fixedly arranged in the first annular groove. The bottom of the connecting pipe and the bottom of the sealing cover are both fixedly provided with first pressing rings for pressing the first sealing ring. The bottom of the first pressing ring is inserted into the first annular groove and abuts against the upper part of the first sealing ring.

[0009] According to an advantageous embodiment, on the upper part of the connecting pipe, there is a second annular groove. A second sealing ring is fixedly arranged inside the second annular groove. The outer lower end of the buried pipe body is fixedly provided with a second pressing ring. The bottom of the second pressing ring is inserted into the second annular groove and abuts against the upper part of the second sealing ring.

[0010] According to an advantageous embodiment, a rectangular groove is arranged on the outer side of the joint body, and there are two annular openings on the outer side of the joint body that are communicated with the rectangular groove.

[0011] According to an advantageous embodiment, the mounting part includes two sliding rods respectively sliding in the two annular openings. A moving block is fixedly arranged between the two sliding rods. On the side of the moving block away from the rectangular groove, there is a mounting block. An installation opening is arranged on the side of the mounting block away from the moving block.

[0012] According to an advantageous embodiment, the moving part includes a moving ring sliding on the threaded rod. Four circumferentially distributed L-shaped connecting plates are fixedly arranged on the outer side of the moving ring. The vertical section on the inner side of the connecting plate is in contact with the outer side of the joint body.

[0013] According to an advantageous embodiment, the upper part of the first positioning plate is connected to the bottom of the connecting plate. Three equally spaced first positioning rods are fixedly arranged at the bottom of the first positioning plate. A first positioning hole for cooperating with the first positioning rod is arranged on the upper part of the moving block, and the corresponding first positioning rod is inserted into the first positioning hole.

[0014] According to an advantageous embodiment, the side of the second positioning plate away from the sealing cover is connected to the connecting plate. Three equally spaced second positioning rods are fixedly arranged at the bottom of the second positioning plate. A plurality of second positioning holes for cooperating with the second positioning rod are arranged on both the first pressing ring and the flow guide cover, and the positions of the second positioning holes on the first pressing ring and the flow guide cover coincide. The bottom end of the second positioning rod passes through the second positioning hole on the first pressing ring and is inserted into the second positioning hole on the flow guide cover.

[0015] According to an advantageous embodiment, two symmetrically distributed upper and lower gaps are provided around the outer side of the joint body, and the two gaps on the same side are respectively connected to the two annular ports.

[0016] According to an advantageous embodiment, two symmetrically distributed water guiding channels are provided inside the joint body, and a water outlet corresponding to the position of the water guiding channel is provided at the bottom of the flow guiding cover.

[0017] Compared with the prior art, a buried pipe U-shaped joint provided by an embodiment of the present invention has the following beneficial effects: 1. When connecting the buried pipe body to the joint body, by screwing the connecting pipe to the connectors at different positions of the flow guiding cover, the position of connecting the buried pipe body on the joint body can be flexibly adjusted, so as to adapt to different spacing conditions of the buried pipes during construction. At the same time, installation parts can be connected at appropriate positions outside the joint body according to different laying pit positions, and then an external support is installed on the installation part. The external support can stably fix the joint body at the center of the laying pit, ensuring the connection and installation effect of the buried pipe body.

[0018] 2. In the present invention, a flow guiding cover and a connecting component are provided. When connecting the buried pipe body to the flow guiding cover, by installing the connecting pipe on different connectors, the installation position of the buried pipe body can be reasonably adjusted according to the construction conditions during installation, so that the distance between the corresponding two buried pipe bodies is reasonable, and the applicability is strong.

[0019] 3. In the present invention, a positioning component and an installation part are provided. When placing the joint body in the laying pit, by connecting the installation part at an appropriate position of the joint body, then installing an external support on the connecting part, and then locking the installation part through the positioning plate, the joint body can be stably in the central position in different laying pits, ensuring that the backfill material is evenly filled around the buried pipe body, and further ensuring the connection and installation effect of the buried pipe body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a structural diagram of the present invention.

[0021] Figure 2 is a sectional structural diagram of the present invention.

[0022] Figure 3 is a connection structural diagram of the flow guiding cover and the connecting component in the present invention.

[0023] Figure 4 is a separated structural diagram of the flow guiding cover, the connecting pipe and the sealing cover in the present invention.

[0024] Figure 5 is a separated structural diagram of the positioning component in the present invention.

[0025] Figure 6 Separation structure diagram of the first positioning rod and the mounting block in the present invention.

[0026] Figure 7 Cross-sectional structure diagram of the diversion cover in the present invention.

[0027] Figure 8 Cross-sectional connection structure diagram of the sealing cover and the connector in the present invention.

[0028] Figure 9 Cross-sectional connection structure diagram of the buried pipe body and the connecting pipe in the present invention.

[0029] Figure 10 Structure diagram of the joint body in the present invention.

[0030] Figure 11 is Figure 10 Enlarged view of the structure of part A in

[0031] Figure 12 Partial state diagram when the connecting pipe is not connected to the buried pipe body in the present invention.

[0032] Figure 13 State diagram when the joint body is placed in the vertical laying pit in the present invention.

[0033] Figure 14 State diagram when the joint body is placed in the horizontal laying pit in the present invention.

[0034] Reference numerals in the figure: 1. Joint body; 2. Buried pipe body; 3. Diversion cover; 4. Water inlet; 5. Connection component; 51. Connector; 52. Connecting pipe; 53. Sealing cover; 6. Mounting part; 61. Slide bar; 62. Moving block; 63. Mounting block; 7. Positioning component; 71. Threaded rod; 72. Moving part; 721. Moving ring; 722. Connecting plate; 73. First positioning plate; 74. Second positioning plate; 75. First positioning rod; 76. Second positioning rod; 8. First annular groove; 9. First sealing ring; 10. First extrusion ring; 11. Second annular groove; 12. Second sealing ring; 13. Second extrusion ring; 14. Rectangular groove; 15. Annular opening; 16. First positioning hole; 17. Second positioning hole; 18. Notch; 19. Water guide channel; 20. Water outlet. Detailed implementation manners

[0035] The following further elaborates on this application Figure 1 - Figure 14 with reference to the appended drawings.

[0036] Please refer to Figure 1 and Figure 7, a buried pipe U-shaped joint, comprising a joint body 1. Four diversion covers 3 are fixedly arranged on the upper part of the joint body 1 in a circumferential distribution. Three water inlets 4 are arranged at equal intervals on the upper part of the diversion cover 3. A connecting component 5 for connecting with the buried pipe body 2 is arranged on the upper part of the diversion cover 3.

[0037] Refer to Figure 1 , Figure 3 and Figure 4 , the connecting component 5 comprises three connectors 51 fixedly arranged on the upper part of the diversion cover 3 and corresponding to the positions of the three water inlets 4 one by one. A connecting pipe 52 is threadedly arranged on the middle connector 51, and the connecting pipe 52 is connected with the buried pipe body 2 by hot melting. Sealing caps 53 for sealing are threadedly arranged on the two side connectors 51.

[0038] Refer to Figure 2 and Figure 7 , two water guiding channels 19 symmetrically distributed left and right are arranged inside the joint body 1. Water outlets 20 corresponding to the positions of the water guiding channels 19 are arranged at the bottom of the diversion cover 3.

[0039] When connecting the buried pipe body 2 and the joint body 1, by threadedly installing the connecting pipe 52 on the corresponding connector 51 on the diversion cover 3, and then hot melting the connection between the buried pipe body 2 and the connecting pipe 52, sealing caps 53 can be threadedly connected to the other two connectors 51 on the diversion cover 3 to ensure that the liquid inside the buried pipe body 2 will not leak after entering the diversion cover 3 through the connecting pipe 52. By connecting the connecting pipe 52 with different connectors 51, the spacing between multiple installed buried pipe bodies 2 can be reasonably controlled according to different construction scenarios, avoiding the situation that the connection installation spacing between the buried pipe bodies 2 cannot be adapted.

[0040] After all four buried pipe bodies 2 are installed, the liquid inside the corresponding two buried pipe bodies 2 can circulate through the water outlets 20 and the water guiding channels 19, increasing the mutual flow effect between the buried pipe bodies 2.

[0041] Refer to Figure 4 and Figure 8 , an annular groove 8 is arranged on the upper part of the diversion cover 3 and outside the water inlets 4. A sealing ring 9 is fixedly arranged in the annular groove 8. Extrusion rings 10 for extruding the sealing ring 9 are fixedly arranged at the bottoms of the connecting pipe 52 and the sealing caps 53. The bottoms of the extrusion rings 10 are inserted into the annular groove 8 and abut against the upper part of the sealing ring 9.

[0042] Refer to Figure 4 and Figure 9, an annular groove II 11 is formed in the upper part of the connecting pipe 52, and a sealing ring II 12 is fixedly arranged inside the annular groove II 11. An extrusion ring II 13 is fixedly arranged at the outer lower end of the buried pipe body 2, and the bottom of the extrusion ring II 13 is inserted into the annular groove II 11 and abuts against the upper part of the sealing ring II 12.

[0043] When the buried pipe body 2 and the connecting pipe 52 are connected by hot melting, the bottom of the extrusion ring II 13 on the buried pipe body 2 squeezes the sealing ring II 12, so that the sealing ring II 12 can further ensure the sealing performance when the buried pipe body 2 and the connecting pipe 52 are connected. When the sealing cover 53 is screwed onto the corresponding connector 51, the bottom of the extrusion ring I 10 on the sealing cover 53 squeezes the sealing ring I 9, which ensures the connection sealing performance between the sealing cover 53 and the corresponding connector 51, and further ensures that the liquid inside the buried pipe body 2 is not prone to leakage when entering the inside of the diversion cover 3.

[0044] Refer to Figure 1 、 Figure 6 、 Figure 10 and Figure 11 , a plurality of mounting parts 6 for connecting with an external bracket to support and position the joint body 1 are arranged on the outer side of the joint body 1. A rectangular groove 14 is formed in the outer side of the joint body 1, and two annular ports 15 communicating with the rectangular groove 14 are formed in the outer side of the joint body 1. The mounting part 6 includes two slide bars 61 respectively slidably arranged in the two annular ports 15. A moving block 62 is fixedly arranged between the two slide bars 61. An installation block 63 is fixedly arranged on one side of the moving block 62 away from the rectangular groove 14, and an installation port is formed on one side of the installation block 63 away from the moving block 62.

[0045] Refer to Figure 11 , two symmetrically distributed upper and lower gaps 18 are formed around the outer side of the joint body 1, and the two gaps 18 on the same side are respectively communicated with the two annular ports 15.

[0046] Refer to Figure 1 、 Figure 2 and Figure 5 , a positioning component 7 for positioning the mounting part 6 and the connecting component 5 is arranged on the upper part of the joint body 1. The positioning component 7 includes a threaded rod 71 threaded on the upper part of the joint body 1. A moving part 72 is arranged on the threaded rod 71, and a positioning plate I 73 for positioning the mounting part 6 is arranged at the bottom of the moving part 72.

[0047] Refer to Figure 5 and Figure 6, the moving member 72 includes a moving ring 721 slidably disposed on the threaded rod 71. Four circumferentially distributed inverted L-shaped connecting plates 722 are fixedly provided on the outer side of the moving ring 721. The inner vertical sections of the connecting plates 722 are in contact with the outer side of the joint body 1. The upper part of the first positioning plate 73 is connected to the bottom of the connecting plate 722. Three equally spaced first positioning rods 75 are fixedly provided at the bottom of the first positioning plate 73. A first positioning hole 16 for cooperating with the first positioning rod 75 is formed in the upper part of the moving block 62, and the corresponding first positioning rod 75 is inserted into the first positioning hole 16.

[0048] After the buried pipe body 2 is installed, the staff can use the notch 18 to move an appropriate number of installation members 6 into the rectangular groove 14, and then use the cooperation of the sliding rod 61 and the annular opening 15 to move the installation member 6 to a suitable position in the rectangular groove 14. Then, the moving ring 721 can be placed on the upper part of the joint body 1. At this time, the four connecting plates 722 slide down on the outer sides of the four sides of the joint body 1 respectively, so as to drive the corresponding first positioning rods 75 at the bottom of the first positioning plate 73 to move down and insert into the first positioning holes 16 on the moving block 62. Then, the bottom end of the threaded rod 71 is passed through the moving ring 721 and aligned with the thread groove on the joint body 1 for rotation. When the threaded rod 71 rotates, it will move downward. When the lower end surface of the convex edge of the threaded rod 71 abuts against the upper part of the moving ring 721, stop rotating the threaded rod 71. At this time, the connecting plate 722 can be limited and locked by the threaded rod 71, so as to limit and fix the moving block 62. Then, the staff can insert the external support frame into the installation opening on the installation block 63, so as to ensure that the joint body 1 is stably in the center position when it is located in the dug laying pit.

[0049] When the laying pit for the buried pipe body 2 is a horizontal pit (as shown in Figure 14 ), during the process of placing the joint body 1 in the horizontal pit, one installation member 6 can be installed on each of the left and right sides of the joint body 1, and two installation members 6 can be installed at the bottom. Then, the external support is connected to the installation member 6. By using the installation members 6 on the left and right sides and the bottom, not only can the joint body 1 be ensured to be in the center position when it is located in the horizontal pit, but also the joint body 1 can be effectively and stably supported.

[0050] When the laying pit for the buried pipe body 2 is a vertical pit (as shown in Figure 13 ), during the process of placing the joint body 1 in the vertical pit, one installation member 6 can be installed on the outer circumference of the joint body 1. Then, after the external support is directly installed on the installation member 6, the four external supports can also ensure that the joint body 1 is in the center position when it is located in the vertical pit, and has high stability. Through the cooperation of the installation member 6 and the external support, the joint body 1 can be kept at a uniform distance from the inner wall of the laying pit, ensuring that the backfill material in the laying pit can be evenly filled.

[0051] See Figure 4 、 Figure 5 and Figure 7 , both sides of the moving part 72 close to the air deflector 3 are provided with positioning plates 74 for positioning the connecting pipe 52 and the sealing cover 53 respectively, and the side of the positioning plate 74 away from the sealing cover 53 is connected to the connecting plate 722, and three equally distributed positioning rods 76 are fixedly provided at the bottom of the positioning plate 74, and a plurality of positioning holes 17 for use with the positioning rods 76 are opened on the extrusion ring 10 and the air deflector 3, and the positions of the positioning holes 17 on the extrusion ring 10 and the air deflector 3 coincide with each other, and the bottom end of the positioning rod 76 passes through the positioning hole 17 on the extrusion ring 10 and is inserted into the positioning hole 17 on the air deflector 3.

[0052] When the connecting plate 722 moves downward and drives the positioning plate 1 73 to move downward, the positioning plate 2 74 will move downward synchronously. The downward movement of the positioning plate 2 74 drives the positioning rod 2 76 to move downward. The positioning rod 2 76 moves downward and passes through the positioning hole 2 17 on the extrusion ring 10 and moves to contact the inner wall of the positioning hole 2 17 on the air guide cover 3. The positioning rod 2 76 can be used to further position the connecting pipe 52 and the sealing cover 53, thereby further ensuring that the sealing cover 53 and the connecting pipe 52 will not shift or loosen during the use of the buried pipe body 2.

[0053] When the second positioning plate 74 does not move, the upper portion of the second positioning plate 74 contacts the lower surface of the convex edge of the connecting pipe 52 (as shown in FIG. Figure 12 As shown), when the buried pipe body 2 is connected to the connecting pipe 52, the connecting pipe 52 can be stably supported by the positioning plate 2 74.

[0054] During the specific operation, first, the connecting pipe 52 is threadedly installed on the corresponding connecting head 51 on the deflector 3 according to different geological and soil environments, and then the buried pipe body 2 is hot-melt connected to the connecting pipe 52. At this time, the remaining connecting heads 51 on the deflector 3 are sealed by the sealing cover 53. When the sealing cover 53 and the buried pipe body 2 are installed, the sealing ring 1 9 and the sealing ring 2 12 can ensure that the liquid inside the buried pipe body 2 is not easy to leak after entering the deflector 3.

[0055] Then, the mounting member 6 is placed into the rectangular groove 14 through the notch 18. Next, the moving ring 721 can be placed on the upper part of the joint body 1. At this time, the four connecting plates 722 slide downwards on the outer sides of the four sides of the joint body 1 respectively, so that the positioning rod 75 corresponding to the bottom of the first positioning plate 73 moves downwards and inserts into the first positioning hole 16 on the moving block 62. Then, the threaded rod 71 is rotated and screwed onto the upper part of the joint body 1 to limit the connecting plate 722, and thus the mounting member 6 can be limited and locked. Then, an external bracket is installed on the mounting member 6. Through the cooperation of the mounting member 6 and the external bracket, the joint body 1 can be kept at an even distance from the inner wall of the laying pit, ensuring that the backfill material in the laying pit can be evenly filled and guaranteeing the connection and installation effect of the buried pipe body 2.

[0056] Meanwhile, the second positioning plate 74 moves downwards to further lock the connecting pipe 52 and the sealing cover 53, which can further ensure that the sealing cover 53 and the connecting pipe 52 will not shift during the use of the buried pipe body 2, further guaranteeing the use effect of the buried pipe body 2.

[0057] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary explanations, these orientation words do not indicate and imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, so they cannot be understood as limiting the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contours of the respective components.

[0058] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connected", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the connection of the interiors of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0059] The above are only the embodiments of the present invention, and thus do not limit the patent scope of the present invention. All equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are similarly included in the patent protection scope of the present invention.

Claims

1. A U-shaped underground pipe joint, comprising a joint body, characterized in that: The upper part of the joint body is fixedly provided with four circumferentially distributed flow guide covers, the upper part of the flow guide covers is provided with three equally distributed water inlets, the upper part of the flow guide covers is provided with a connection assembly for connecting to the buried pipe body, and the outer side of the joint body is provided with a plurality of mounting parts for connecting to the external bracket to support and position the joint body; The connection assembly includes three connectors fixedly arranged on the upper part of the deflector and corresponding to the positions of the three water inlets. A connecting pipe is threadedly arranged on the middle connector, and the connecting pipe is hot-melt-connected to the buried pipe body. The connectors on both sides are threadedly provided with sealing caps for sealing them. A positioning assembly for positioning the mounting part and the connecting assembly is provided on the upper part of the joint body. The positioning assembly includes a threaded rod threadedly provided on the upper part of the joint body, a moving part is provided on the threaded rod, and a positioning plate 1 for positioning the mounting part is provided at the bottom of the moving part. Positioning plates 2 for positioning the connecting pipe and the sealing cover are provided on both sides of the moving part close to the air guide cover.

2. The underground pipe U-joint according to claim 1, characterized in that: An annular groove is provided on the upper part of the deflector and on the outside of the water inlet. A sealing ring is fixedly provided in the annular groove. An extrusion ring for squeezing the sealing ring is fixedly provided at the bottom of the connecting pipe and the bottom of the sealing cover. The bottom of the extrusion ring is inserted into the annular groove and abuts against the upper part of the sealing ring.

3. The underground pipe U-joint according to claim 1, characterized in that: A second annular groove is provided on the upper part of the connecting pipe, a second sealing ring is fixedly provided inside the second annular groove, a second extrusion ring is fixedly provided on the lower end of the outer side of the buried pipe body, the bottom of the second extrusion ring is inserted into the second annular groove and abuts against the upper part of the second sealing ring.

4. The underground pipe U-joint according to claim 1, characterized in that: A rectangular groove is provided on the outer side of the joint body, and two annular openings communicating with the rectangular groove are provided on the outer side of the joint body.

5. The underground pipe U-joint according to claim 4, characterized in that: The mounting member includes two slide rods respectively slidably arranged in the two annular openings, a moving block is fixedly arranged between the two slide rods, a mounting block is fixedly arranged on the side of the moving block away from the rectangular groove, and a mounting opening is opened on the side of the mounting block away from the moving block.

6. The underground pipe U-joint according to claim 1, characterized in that: The moving part includes a moving ring slidably arranged on the threaded rod, and four circumferentially distributed inverted L-shaped connecting plates are fixedly arranged on the outer side of the moving ring, and the inner vertical sections of the connecting plates are in contact with the outer side of the joint body.

7. The underground pipe U-joint according to claim 6, characterized in that: The upper part of the positioning plate 1 is connected to the bottom of the connecting plate, and three equally spaced positioning rods 1 are fixedly provided on the bottom of the positioning plate 1. The upper part of the moving block is provided with a positioning hole 1 for use with the positioning rod 1, and the corresponding positioning rod 1 is plugged into the positioning hole 1.

8. The underground pipe U-shaped joint according to claim 2, characterized in that: The positioning plate 2 is connected to the connecting plate on the side away from the sealing cover. Three equally spaced positioning rods 2 are fixedly provided on the bottom of the positioning plate 2. The extrusion ring 1 and the air guide cover are both provided with multiple positioning holes 2 used in conjunction with the positioning rods 2, and the positions of the positioning holes 2 on the extrusion ring 1 and the air guide cover coincide. The bottom end of the positioning rod 2 passes through the positioning hole 2 on the extrusion ring 1 and is inserted into the positioning hole 2 on the air guide cover.

9. The underground pipe U-joint according to claim 4, characterized in that: Two notches symmetrically distributed up and down are provided around the outer side of the joint body, and the two notches on the same side are respectively connected to the two annular openings.

10. The underground pipe U-joint according to claim 1, characterized in that: Two water guide channels symmetrically distributed front to back are provided inside the joint body, and a water outlet corresponding to the position of the water guide channel is provided at the bottom of the deflector cover.

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