External water pressure test method for joints of large-diameter reinforced concrete jacking pipes

Abstract

The present invention relates to a method for external water pressure test of the interface of super-large diameter reinforced concrete pipe jacking pipe joints, including the steps of pipe joint docking, pipe joint adjustment, pipe joint fastening, external water pressure test of the pipe joint interface, pipe joint lifting, and external water pressure test of the pipe joint interface corner. The beneficial effects of the present invention are as follows: A bottom support system is adopted, and circular slots are provided on the upper steel plate connecting plate. Cylindrical pins are inserted and limited and fixed according to the size of the concrete pipe joint, and a steel support frame for adjusting the verticality of the concrete pipe joint is formed by hydraulic jacks, solving the problem of difficult adjustment of the verticality of super-large diameter reinforced concrete pipe joints; An operation platform is adopted, solving the problems of difficult high-altitude operation and lack of safety guarantee during pipe joint docking, and the height of the operation platform is adjustable; A hanging type pipe joint fastening device is adopted, and a squeezing force is formed between the upper elbow fixing frame and the lower elbow fixing frame through a hydraulic jack, solving the problem of difficult tensioning and fastening of pipe joints under super-large diameter working conditions.

Description

Technical Field

[0001] The present invention belongs to the field of reinforced concrete pipe jacking construction, and particularly relates to a method for external water pressure test of the interface of a super-large diameter reinforced concrete pipe jacking pipe section. Background Art

[0002] Before the implementation of 4-meter large-diameter pipe jacking construction, in order to ensure the safety, economy and efficiency of the project construction and ensure the safe implementation and operation of the project, it is necessary to conduct tests on the structural stress performance and sealing performance of the concrete prototype pipe for the pipe materials under large-diameter conditions, carry out relevant research work, provide technical support for the design calculation of the pipeline, the production of pipe sections and the formulation of acceptance standards for pipe jacking construction, and at the same time provide technical services for project decision-making. The current pipe section implementation standards, "Concrete and Reinforced Concrete Drain Pipes" (GB / T 11836-2009) and "Reinforced Concrete Drain Pipes for Pipe Jacking Construction" (JC / T 640-2010), have a maximum diameter range of only up to DN3500, and the maximum value of the internal water pressure test is 0.1 MPa. When the pipe section diameter reaches 4 meters, it exceeds the national standard specifications. Moreover, the test device in the national standard "GB / T 16752-2017 Test Methods for Concrete and Reinforced Concrete Drain Pipes" is also not applicable to super-large diameter pipe sections. It is difficult to install the traditional test device under super-large diameter conditions, the device fixation is cumbersome, and it takes a long time.

[0003] In view of this, there is an urgent need to invent a simple and effective test method to solve the problems encountered in the implementation of the external water pressure test of the concrete interface with super-large diameter. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for external water pressure test of the interface of a super-large diameter reinforced concrete pipe jacking pipe section.

[0005] This method for external water pressure test of the interface of a super-large diameter reinforced concrete pipe jacking pipe section includes the following steps:

[0006] S00, Pipe Section Docking: Lift and place the concrete pipe section at the center of the bottom support system, install cylindrical pins for fixation according to the size of the concrete pipe section, and adjust the verticality through a hydraulic jack;

[0007] S10, Pipe Section Adjustment: Splice the upper and lower concrete pipe sections, and adjust them to be vertical for the upper and lower concrete pipe sections through the operation platform. The operation platform includes an annular platform and a lower steel column, and a steel column with bolt holes is spliced below the lower steel column through bolt a;

[0008] S20, Pipe Section Fastening: Adopt a hanging pipe section fastening device, and use a hydraulic jack to make the upper elbow fixing frame and the lower elbow fixing frame respectively squeeze the two concrete pipe sections from the upper and lower ends;

[0009] S30. External water pressure test for the pipe joint: Hang and install the external water pressure inspection ring on the outer wall of the pipe joint through the hanging rod of the pipe joint test device. Inject water into the interior of the external water pressure inspection ring of the pipe joint through the inlet and drain pipes, and observe whether there is water leakage at the pipe joint.

[0010] S40. Pipe jacking: Use the external jacking structure and the internal jacking structure to jack up one side of the upper concrete pipe joint, so that a corner appears at the pipe joint.

[0011] S50. External water pressure test for the pipe joint corner: Use the external water pressure inspection ring to test the external water pressure at the pipe joint corner.

[0012] Preferably, in step S00, the bottom support system includes an upper steel section connecting plate, an upper steel ring frame and a lower steel ring frame. The upper steel ring frame and the lower steel ring frame are connected by a cylindrical support body. A cylindrical support body is arranged at the center between the upper steel ring frame and the lower steel ring frame of the bottom support system. A hydraulic jack is arranged at the outer edge between the upper steel ring frame and the lower steel ring frame. The upper steel ring frame and the cylindrical support body are connected by an upper steel section connecting plate. A circular slot is arranged on the upper steel section connecting plate. The lower steel ring frame and the cylindrical support body are connected by a lower steel section connecting plate. The concrete pipe joint is placed at the center of the bottom support system and concentrically placed with the cylindrical support body. The concrete pipe joint and the bottom support system are fixed by column-shaped pins.

[0013] Preferably, in step S10, the operation platform includes an upper annular fixing frame, steel columns, an annular platform and lower steel columns. The upper annular fixing frame and the annular platform in the operation platform are connected by steel columns. A middle annular fixing frame is arranged in the middle of the steel columns. The annular platform and the lower steel columns are connected by diagonal braces. A lower annular fixing frame is arranged on the inner side of the lower part of the lower steel columns. A steel column with bolt holes is fixedly connected to the lower part of the lower steel column through bolt a. Bolt holes a are arranged on the outer side of the lower steel column with bolt holes. The steel columns with bolt holes are connected by a bottom annular fixing frame.

[0014] Preferably, in step S20, the hanging type pipe joint fastening device includes an upper elbow fixing frame, a screw rod, a lower supporting annular steel plate, an upper supporting annular steel plate and a hydraulic jack. The upper part of the screw rod is provided with an upper elbow fixing frame and is connected to the lower part with a lower supporting annular steel plate. A hydraulic jack is arranged between the lower supporting annular steel plate and the upper supporting annular steel plate of the hanging type pipe joint fastening device. A lower elbow fixing frame is arranged on the upper supporting annular steel plate. During the test, hang the upper elbow fixing frame on the top end of the upper concrete pipe joint, and hang the lower elbow fixing frame on the bottom section of the lower concrete pipe joint. Start the hydraulic jack to make an extrusion force form between the upper elbow fixing frame and the lower elbow fixing frame to fasten the two concrete pipe joints.

[0015] Preferably, in step S30, the external water pressure inspection ring is of a hollow structure. A water inlet and drain pipe is arranged in the middle of the outer side of the inspection ring, and an exhaust pipe is arranged on the opposite side. A pressure test device is arranged on the exhaust pipe. Airbag inflation pipes are arranged at the upper and lower parts of the water inlet and drain pipe. Rubber inflation airbags and rubber sealing rings are arranged at the upper and lower edges of the inner side of the external water pressure inspection ring. The airbag inflation pipes are connected to the rubber inflation airbags. A hanging rod for the pipe joint test device is arranged at the upper part of the external water pressure inspection ring. During the test, the external water pressure inspection ring is hung at the interface of two pipe joints through the hanging rod of the pipe joint test device. The rubber sealing airbag is inflated through the airbag inflation pipe, and the external water pressure inspection ring is fitted to the outer wall of the pipe joint interface in cooperation with the rubber sealing ring. Water is injected into the internal part of the external water pressure inspection ring of the pipe joint through the water inlet and drain pipe. After the water flows out of the exhaust pipe, the water injection is stopped and the water inlet and drain pipe is closed. After maintaining the pressure for a period of time, it is observed whether there is water leakage at the pipe joint interface.

[0016] Preferably, in step S40, an internal lifting structure is adopted to lift the pipe joint to form an angle. The internal lifting structure includes an L-shaped steel plate, bolt b, and a hydraulic jack. During the experiment, L-shaped steel plates are mirror-symmetrically arranged on the inner walls at the interfaces of two pipe joints. Reinforcing structure steel braces are arranged on the right-angled sides of the L-shaped steel plates. Bolt holes b are arranged on the L-shaped steel plates. The L-shaped steel plates are fixed through bolt b. A hydraulic jack is placed with the L-shaped steel plate on the lower concrete pipe joint as the base, so that the upper end of the hydraulic jack abuts against the bottom of the L-shaped steel plate arranged on the upper concrete pipe joint. The hydraulic jack is started to lift one side of the upper concrete pipe joint to form an included angle.

[0017] Preferably, in step S40, an external lifting structure is adopted to lift the pipe joint to form an angle. The external lifting structure includes a hoop fastening ring. During the experiment, the hoop fastening ring is placed on the upper concrete pipe joint at the pipe joint interface. The hoop fastening ring is of a semi-circular ring structure. Square ear blocks are welded at both ends of the hoop fastening ring. Hanging rope holes and bolt holes c are arranged on the square ear blocks. The two hoop fastening rings are fixed through bolt c and nuts. The hanging rope is passed through the hanging rope hole, and a crane is used to lift and raise the upper concrete pipe joint. Wedge blocks are inserted at the pipe joint interface to fix the angle of the two pipe joints.

[0018] Preferably, in step S50, after an angle is formed between the upper concrete pipe joint and the lower concrete pipe joint, in the same manner as in step S30, the external water pressure of the pipe joint interface angle is tested through the external water pressure inspection ring.

[0019] The beneficial effects of the present invention are:

[0020] 1) A bottom support system is adopted. Circular slots are arranged on the upper steel plate connection plate. Column-shaped pins are inserted and limited and fixed according to the size of the concrete pipe joint, and a steel support frame for adjusting the verticality of the concrete pipe joint is formed through a hydraulic jack, solving the problem of difficult adjustment of the verticality of super-large diameter reinforced concrete pipe joints.

[0021] 2) An operating platform is adopted to solve the problems of difficult high-altitude operation and lack of safety guarantee during the butt joint of pipe sections. Moreover, the lower steel columns are spliced with steel columns with bolt holes through bolt a, making the height of the operating platform adjustable.

[0022] 3) A hanging type pipe section fastening device is adopted. Through a hydraulic jack, an extrusion force is formed between the upper elbow fixing frame and the lower elbow fixing frame, so as to fasten the two concrete pipe sections, solving the problem of difficult tension fastening of pipe sections under the condition of extra-large diameter.

[0023] 4) A hanging type pipe section hydrostatic test device is adopted to solve the problem of difficult installation of the pipe section hydrostatic test device under extra-large diameter.

[0024] 5) The cooperation of an internal support type pipe section lifting device and an external hoop type pipe section lifting device is adopted to solve the problem of difficult lifting and turning of extra-large diameter pipe sections. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the bottom support system structure;

[0026] Figure 2 It is a schematic diagram of the operating platform structure;

[0027] Figure 3 It is a front view schematic diagram of the operating platform;

[0028] Figure 4 It is a schematic diagram of the structure of the hanging type pipe section fastening device;

[0029] Figure 5 It is a construction schematic diagram of the structure of the hanging type pipe section fastening device;

[0030] Figure 6 It is a construction schematic diagram of the hydrostatic test device outside the pipe section interface;

[0031] Figure 7 It is a schematic diagram of the structure of the hydrostatic test device outside the pipe section interface;

[0032] Figure 8 It is a schematic diagram of the internal section of the structure of the hydrostatic test device outside the pipe section interface;

[0033] Figure 9 It is a cross-sectional view schematic diagram of the inner side lifting device at the pipe section interface corner;

[0034] Figure 10 It is a cross-sectional view schematic diagram of the outer side lifting device at the pipe section interface corner;

[0035] Figure 11 It is a construction schematic diagram of the outer side lifting device at the pipe section interface corner;

[0036] Figure 12 It is a schematic diagram of the structure of the outer side lifting device at the pipe section interface corner;

[0037] Figure 13 is Figure 12 a schematic structural diagram of area A in

[0038] Figure 14 a front view of the construction of the lifting device for the outer corner of the pipe joint

[0039] Figure 15 is Figure 14 an enlarged view of area B in

[0040] Figure 16 a process flow chart of the external water pressure test method for the interface of the ultra-large diameter reinforced concrete jacking pipe joint

[0041] Among them: 1. Concrete pipe joint, 2. Upper steel connecting plate, 3. Circular grooving, 4. Hydraulic jack, 5. Upper steel ring frame, 6. Lower steel ring frame, 7. Cylindrical support, 8. Lower steel connecting plate, 9. Columnar pin, 10. Upper annular fixing frame, 11. Steel column, 12. Annular platform, 13. Middle annular fixing frame, 14. Diagonal brace, 15. Lower steel column, 16. Bolt a, 17. Bolt hole a, 18. Lower steel column with bolt hole, 19. Lower annular fixing frame, 20. Bottom annular fixing frame, 21. Hanging rod of the pipe joint test device, 22. External water pressure inspection ring, 23. Air bag inflating pipe, 24. Inlet and drain pipe, 25. Exhaust pipe, 26. Pressure test device, 27. Rubber inflatable bag, 28. Rubber sealing ring, 29. Upper elbow fixing frame, 30. Screw rod, 31. Lower supporting annular steel plate, 32. Upper supporting annular steel plate, 33. Lower elbow fixing frame, 34. Upper concrete pipe joint, 35. Lower concrete pipe joint, 36. Bolt b, 37. Steel plate brace, 38. L-shaped steel plate, 39. Bolt hole b, 40. Hoop fastening ring, 41. Square ear block, 42. Hanging rope hole, 43. Bolt c, 44. Nut, 45. Bolt hole c. Specific implementation mode

[0042] The following further describes the present invention in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0043] As an embodiment, as Figure 16 shown, a method for external water pressure test of the interface of an ultra-large diameter reinforced concrete jacking pipe joint includes the following steps:

[0044] S00 Pipe joint docking: Lift and place the pipe joint on the bottom support system, which includes the upper steel section connecting plate 2, the upper steel ring frame 5, the lower steel ring frame 6, etc. The upper steel ring frame 5 and the lower steel ring frame 6 are connected by a cylindrical support 7, and a hydraulic jack 4 is arranged at the outer edge between the upper steel ring frame 5 and the lower steel ring frame 6;

[0045] As Figure 1 shown, in step S00, a cylindrical support 7 is arranged at the center between the upper steel ring frame 5 and the lower steel ring frame 6 of the bottom support system, and a hydraulic jack 4 is arranged at the outer edge. The upper steel ring frame 5 and the cylindrical support 7 are connected by the upper steel section connecting plate 2. A circular slot 3 is arranged on the upper steel section connecting plate 2. The lower steel ring frame 6 and the cylindrical support 7 are connected by the lower steel section connecting plate 8. The concrete pipe joint 1 is placed at the center of the bottom support system and concentric with the cylindrical support 7. The concrete pipe joint 1 and the bottom support system are fixed by a cylindrical pin 9.

[0046] S10 Pipe joint adjustment: Adjust the upper and lower pipe joints on the operation platform so that the upper and lower pipe joints are kept vertical. The operation platform includes the upper annular fixing frame 10, the steel column 11, the annular platform 12, the diagonal brace 14, the lower steel column 15, the lower annular fixing frame 19, etc. The upper annular fixing frame 10 and the annular platform 12 are connected by the steel column 11. The annular platform 12 and the lower steel column 15 are connected by the diagonal brace 14. The lower annular fixing frame 19 is arranged on the inner side of the lower part of the lower steel column 15;

[0047] As Figures 2 to 3 shown, in step S10, the upper annular fixing frame 10 and the annular platform 12 of the operation platform are connected by the steel column 11. A middle annular fixing frame 13 is arranged in the middle of the steel column 11. The annular platform 12 and the lower steel column 15 are connected by the diagonal brace 14. The lower annular fixing frame 19 is arranged on the inner side of the lower part of the lower steel column 15, and a bolt hole a17 is arranged on the outer side. Bolt holes a17 are arranged on the outer sides of the lower steel columns 18 with bolt holes. The lower steel columns 18 with bolt holes are connected by the bottom annular fixing frame 20. The lower steel column 15 and the lower steel column 18 with bolt holes are fixed by bolts a16.

[0048] S20 Pipe joint fastening: Fasten the two pipe joints with a hanging pipe joint fastening device. The hanging pipe joint fastening device includes the upper elbow fixing frame 29, the screw 30, the lower supporting annular steel plate 31, the upper supporting annular steel plate 32, the hydraulic jack 4, etc. The upper part of the screw 30 is provided with the upper elbow fixing frame 29, and the lower part is connected to the lower supporting annular steel plate 31. A hydraulic jack 4 is arranged between the upper supporting annular steel plate 32 and the lower supporting annular steel plate 31;

[0049] As Figures 4 to 5As shown, in step S20, a hydraulic jack 4 is provided between the lower support ring-shaped steel plate 31 and the upper support ring-shaped steel plate 32 of the hanging pipe joint fastening device. The lower support ring-shaped steel plate is connected to a screw rod 30, and the upper part of the screw rod is connected to an upper elbow fixing bracket 29. A lower elbow fixing bracket 33 is provided on the upper support ring-shaped steel plate. During the test, the upper elbow fixing bracket 29 is hung on the inner wall of the upper pipe joint, and the lower elbow fixing bracket is hung on the inner wall of the lower pipe joint. The hydraulic jack 4 is started to form a squeezing force between the upper and lower support ring-shaped steel plates to fasten the two pipe joints.

[0050] S30 External water pressure test for the pipe joint interface. Install the external water pressure inspection ring 22 on the outer wall of the pipe joint interface, hang the hanging rod 21 of the pipe joint test device on the upper end of the outer wall of the pipe joint, and conduct the external water pressure test at the pipe joint interface.

[0051] As Figures 6 to 8 As shown, in step S30, the external water pressure inspection ring 22 is a hollow structure. An inlet and drain pipe 24 is provided in the middle of the outer side of the inspection ring, an exhaust pipe 25 is provided on the opposite side, a pressure test device 26 is provided on the exhaust pipe 25, airbag inflating pipes 23 are provided at the upper and lower parts of the inlet and drain pipe 24, rubber airbags 27 and rubber sealing rings 28 are provided at the upper and lower edges of the inner side of the external water pressure inspection ring. The airbag inflating pipe 23 is connected to the rubber airbag 23. A hanging rod 21 of the pipe joint test device is provided at the upper part of the inspection ring. During the test, the external water pressure inspection ring 22 is hung at the interface of the two pipe joints through the hanging rod 21 of the pipe joint test device. The rubber sealing airbag 27 is inflated through the airbag inflating pipe 23 and cooperates with the rubber sealing ring 28 to make the inspection ring closely adhere to the outer wall of the pipe joint interface. Water is injected into the internal part of the external water pressure inspection ring 22 of the pipe joint through the inlet and drain pipe 23. After the water flows out from the exhaust pipe 25, stop injecting water and seal the inlet and drain pipe 23. After maintaining the pressure for a period of time, observe whether there is water leakage at the pipe joint interface.

[0052] S40 Pipe joint lifting: Lift the pipe joint so that there is an angle at the interface of the two pipe joints.

[0053] As Figure 9 As shown, in step S40, an internal lifting structure is used to lift the pipe joint to form an angle. During the experiment, L-shaped steel plates 38 are respectively arranged mirror-symmetrically on the inner walls at the interfaces of the two pipe joints. A reinforcing structure steel plate brace 37 is provided on the right-angled side of the L-shaped steel plate 38. Bolt holes b39 are provided on the L-shaped steel plate 38, and the L-shaped steel plate is fixed through bolts b36. Use the L-shaped steel plate 38 on the lower concrete pipe joint 35 as a base to place a hydraulic jack 4, so that the upper end of the hydraulic jack 4 abuts against the bottom of the L-shaped steel plate 38 provided on the upper concrete pipe joint 34. Start the hydraulic jack 4 to lift the upper concrete pipe joint 34 to form an included angle.

[0054] As Figures 10 to 15As shown in the figure, in step S40, an external lifting structure is used to lift the pipe section to form a corner. During the experiment, the hoop fastening ring 40 is placed on the upper concrete pipe section at the pipe joint. The hoop fastening ring 40 is a semi-circular ring structure. Square ear blocks 41 are welded at both ends of the hoop fastening ring 40. A lifting rope hole 42 and a bolt hole c45 are provided on the square ear block 41. The two hoop fastening rings 40 are fixed by bolts c43 and nuts 44. The lifting rope is passed through the lifting rope hole 42, and a crane is used to lift the upper concrete pipe section. A wedge block 46 is inserted at the pipe joint to form a corner between the two pipe sections.

[0055] S50 External water pressure test for the corner of the pipe joint: The external water pressure inspection ring 22 in step S30 is used to test the external water pressure at the corner of the pipe joint.

Claims

1. A method for external water pressure test of the interface of a super-large diameter reinforced concrete jacking pipe joint, characterized in that, The steps include the following: S00, Segment docking: Lift and place the concrete segment (1) at the center of the bottom support system, install the cylindrical dowel pin (9) for fixation according to the size of the concrete segment (1), and adjust the verticality by the hydraulic jack (4); S10, Segment adjustment: Assemble the upper and lower concrete segments (1), and adjust them to be vertical for the upper concrete segment (34) and the lower concrete segment (35) through the operation platform. The operation platform includes an annular platform (12) and a lower steel column (15). A steel column with bolt holes (18) is spliced below the lower steel column (15) through bolt a (16); S20, Segment fastening: Adopt a hanging segment fastening device, and use the hydraulic jack (4) to make the upper elbow fixing frame (29) and the lower elbow fixing frame (33) squeeze the two concrete segments (1) from the upper and lower ends respectively; S30, External water pressure test for segment joints: Hang and install the external water pressure inspection ring (22) on the outer wall of the segment joint through the hanging rod (21) of the segment test device, inject water into the interior of the external water pressure inspection ring (22) of the segment through the water inlet and drain pipe (24), and observe whether there is water leakage at the segment joint; S40, Segment lifting: Use the external lifting structure and the internal lifting structure to lift one side of the upper concrete segment (34) to make a corner appear at the segment joint; S50, External water pressure test for segment joint corner: Use the external water pressure inspection ring (22) to test the external water pressure of the segment joint corner; In step S00, the bottom support system includes an upper profiled steel connecting plate (2), an upper steel ring frame (5) and a lower steel ring frame (6). The upper steel ring frame (5) and the lower steel ring frame (6) are connected by a cylindrical support body (7). A cylindrical support body (7) is arranged at the center between the upper steel ring frame (5) and the lower steel ring frame (6) of the bottom support system. A hydraulic jack (4) is arranged at the outer edge between the upper steel ring frame (5) and the lower steel ring frame (6). The upper steel ring frame (5) and the cylindrical support body (7) are connected by the upper profiled steel connecting plate (2). A circular slot (3) is arranged on the upper profiled steel connecting plate (2). The lower steel ring frame (6) and the cylindrical support body (7) are connected by the lower profiled steel connecting plate (8). The concrete segment (1) is placed at the center of the bottom support system and concentrically placed with the cylindrical support body (7). The concrete segment (1) and the bottom support system are fixed by the cylindrical dowel pin (9); In step S20, the hanging pipe joint fastening device includes an upper elbow fixing bracket (29), a screw rod (30), a lower supporting annular steel plate (31), an upper supporting annular steel plate (32), and a hydraulic jack (4). The upper part of the screw rod (30) is provided with the upper elbow fixing bracket (29), and the lower part is connected to the lower supporting annular steel plate (31). A hydraulic jack (4) is arranged between the lower supporting annular steel plate (31) and the upper supporting annular steel plate (32) of the hanging pipe joint fastening device. A lower elbow fixing bracket (33) is arranged on the upper supporting annular steel plate (32). During the test, the upper elbow fixing bracket (29) is hung on the top end of the upper concrete pipe joint (34), and the lower elbow fixing bracket (33) is hung on the bottom section of the lower concrete pipe joint (35). The hydraulic jack (4) is started, so that an extrusion force is formed between the upper elbow fixing bracket (29) and the lower elbow fixing bracket (33) to fasten the two concrete pipe joints (1).

2. The method for external water pressure test of the interface of a super-large diameter reinforced concrete jacking pipe joint according to claim 1, characterized in that: In step S10, the operation platform includes an upper annular fixing bracket (10), steel columns (11), an annular platform (12), and lower steel columns (15). The upper annular fixing bracket (10) in the operation platform is connected to the annular platform (12) through the steel columns (11). A middle annular fixing bracket (13) is arranged in the middle of the steel columns (11). The annular platform (12) and the lower steel columns (15) are connected by diagonal braces (14). A lower annular fixing bracket (19) is arranged on the inner side of the lower part of the lower steel columns (15). The lower part of the lower steel columns (15) is fixedly connected to a steel column with bolt holes (18) through a bolt a (16). Bolt holes a (17) are arranged on the outer side of the lower steel column with bolt holes (18). The steel columns with bolt holes (18) are connected by a bottom annular fixing bracket (20).

3. A method for external water pressure test of the interface of a super-large diameter reinforced concrete jacking pipe joint according to claim 1, characterized in that: In step S30, the external water pressure inspection ring (22) is a hollow structure. A water inlet and drain pipe (24) is arranged in the middle of the outer side of the inspection ring. An exhaust pipe (25) is arranged on the opposite side. A pressure test device (26) is arranged on the exhaust pipe (25). Air bag inflating pipes (23) are arranged at the upper and lower parts of the water inlet and drain pipe (24). Rubber inflatable air bags (27) and rubber sealing rings (28) are arranged on the upper and lower edges of the inner side of the external water pressure inspection ring (22). The air bag inflating pipes (23) are connected to the rubber inflatable air bags (27). A hanging rod (21) of the pipe joint test device is arranged on the upper part of the external water pressure inspection ring (22). During the test, the external water pressure inspection ring (22) is hung at the interface of the two pipe joints through the hanging rod (21) of the pipe joint test device. The rubber inflatable air bags (27) are inflated through the air bag inflating pipes (23). The external water pressure inspection ring (22) is fitted to the outer wall of the pipe joint interface in cooperation with the rubber sealing rings (28). Water is injected into the internal part of the external water pressure inspection ring (22) of the pipe joint through the water inlet and drain pipe (24). After the water flows out of the exhaust pipe (25), the water injection is stopped and the water inlet and drain pipe (24) is closed. After maintaining the pressure for a period of time, it is observed whether there is water leakage at the pipe joint interface.

4. A method for external water pressure test of the interface of a super-large diameter reinforced concrete jacking pipe joint according to claim 1, characterized in that: In step S40, an internal lifting structure is adopted to lift the pipe section to form a corner. The internal lifting structure includes an L-shaped steel plate (38), bolt b (36), and a hydraulic jack (4). During the experiment, the L-shaped steel plate (38) is mirror-symmetrically arranged on the inner wall at the interface of the two pipe sections. A reinforcing structure steel plate brace (37) is provided on the right-angled side of the L-shaped steel plate (38). Bolt holes b (39) are provided on the L-shaped steel plate (38). The L-shaped steel plate is fixed by bolt b (36). A hydraulic jack (4) is placed with the L-shaped steel plate (38) on the lower concrete pipe section (35) as the base, so that the upper end of the hydraulic jack abuts against the bottom of the L-shaped steel plate (38) provided on the upper concrete pipe section (34). The hydraulic jack (4) is started to lift one side of the upper concrete pipe section (34) to form an included angle.

5. A method for external water pressure test of the interface of a super-large diameter reinforced concrete jacking pipe joint according to claim 1, characterized in that: In step S40, an external lifting structure is adopted to lift the pipe section to form a corner. The external lifting structure includes a hoop fastening ring (40). During the experiment, the hoop fastening ring (40) is placed on the upper concrete pipe section (34) at the interface of the pipe section. The hoop fastening ring (40) is a semi-circular ring structure. Square ear blocks (41) are welded at both ends of the hoop fastening ring (40). Hoisting rope holes (42) and bolt holes c (45) are provided on the square ear blocks (41). The two hoop fastening rings (40) are fixed by bolt c (43) and nuts (44). The hoisting rope is passed through the hoisting rope hole (42), and a crane is used to lift the upper concrete pipe section (34). Wedge blocks (46) are inserted at the interface of the pipe sections to fix the corner of the two pipe sections.

6. A method for external water pressure test of the interface of a super-large diameter reinforced concrete jacking pipe joint according to claim 3, characterized in that: In step S50, after a corner is formed between the upper concrete pipe section (34) and the lower concrete pipe section (35), in the same manner as in step S30, the external water pressure test ring (22) is used to test the external water pressure at the corner of the pipe section interface.

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