Variable diameter joint of a super deep cutoff wall joint pipe joint and construction method

Abstract

The application discloses a reducing type joint of an ultra-deep anti-seepage wall joint pipe joint and a construction method, and the device comprises a large-diameter bottom pipe, one end of the large-diameter bottom pipe is inserted and connected with a large-diameter insertion rod arranged at one end of a large-diameter joint pipe through a large-diameter insertion slot; the other end of the large-diameter joint pipe is also connected with a large-diameter insertion slot and is inserted and connected with an adjacent large-diameter joint pipe, a plurality of large-diameter joint pipes are connected to form a large-diameter pipe section; the end of the large-diameter pipe section is connected with a large-small-diameter connector, the other end of the large-small-diameter connector is connected with a small-diameter pipe section, and the small-diameter pipe section is connected by a plurality of small-diameter joint pipes. The method solves the problem that the pipe of the anti-seepage wall joint pipe is difficult to pull out in the prior art, has the characteristics that the pipe can be pulled out by the way that grouting is actively performed from the hole to the hole bottom, negative pressure is avoided to be generated at the bottom of the pipe pulling-out machine, and the difficulty of pipe pulling-out is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cutoff wall, and particularly relates to a variable-diameter joint of a joint pipe of an ultra-deep cutoff wall and a construction method. BACKGROUND

[0002] With the development of water conservancy and hydropower industry, the development of water conservancy and hydropower projects gradually expands to the western plateau and canyon basin, and the dam building conditions are more and more complex, especially in the key construction projects under the opportunity of western development, the mountains are high and deep, the overburden is deep, and the geological conditions are complex; generally, a cutoff wall is used as a vertical anti-seepage system of a dam, the cutoff wall is an underground continuous wall constructed by using slurry protection wall trenching and then pouring concrete or backfilling other anti-seepage materials under the slurry, and the cutoff wall has the effect of anti-seepage. Generally, the cutoff wall needs to be divided into multiple different unit slots and unit wall segments, and the unit wall segments are connected into an integral cutoff wall through joints or joints. At the connection, the pipe pulling method is usually used for operation, that is, before pouring concrete in a first slot segment, a joint pipe is arranged on both sides of the slot segment, and after the concrete is initially cured, the joint pipe is pulled out through a pipe pulling machine or a crane, so as to form smooth semicylindrical surfaces on both sides of the first slot segment, facilitating the construction of a second slot segment, and forming a joint surface thereon; for an ultra-deep cutoff wall, if the entire joint pipe is of a large diameter, the overall cost and weight will increase, and with the pouring of the concrete, the joint pipe is extruded to the side wall, the contact area with the original soil increases, and the friction force also increases accordingly, which brings greater difficulty to pipe pulling, and easily causes pipe casting accidents. Therefore, it is necessary to design a variable-diameter joint of a joint pipe of an ultra-deep cutoff wall and a construction method to solve the above problems. SUMMARY

[0003] The technical problem to be solved by the application is to provide a variable-diameter joint of a joint pipe of an ultra-deep cutoff wall and a construction method, which solves the problem of great difficulty in pipe pulling of the joint pipe of the cutoff wall in the prior art, and has the characteristics that the difficulty in pipe pulling is reduced by actively grouting from the hole opening to the hole bottom, thereby avoiding negative pressure at the bottom of the pipe pulling machine.

[0004] To solve the above technical problems, the technical solution adopted by the application is as follows:

[0005] A variable-diameter joint of a joint pipe of an ultra-deep cutoff wall, comprising a large-diameter bottom pipe, one end of the large-diameter bottom pipe is inserted and connected with a large-diameter insertion rod arranged at one end of a large-diameter joint pipe through a large-diameter insertion slot; the other end of the large-diameter joint pipe is also connected with a large-diameter insertion slot and is inserted and connected with an adjacent large-diameter joint pipe, a plurality of large-diameter joint pipes form a large-diameter pipe segment; the end of the large-diameter pipe segment is connected with a large-small-diameter connector, the other end of the large-small-diameter connector is connected with a small-diameter pipe segment, and the small-diameter pipe segment is connected by a plurality of small-diameter joint pipes.

[0006] Preferably, the small-diameter connector tube is a hollow float tube with multiple hollow float boxes inside; one end of the small-diameter connector tube is connected to a small-diameter slot, and the other end is connected to a small-diameter insert rod that is inserted into and engaged with the small-diameter slot of the adjacent small-diameter connector tube.

[0007] Preferably, the large-diameter connector pipe includes a hollow floating pipe section and a hollow through pipe section; the floating pipe section is provided with multiple hollow pontoons inside.

[0008] Furthermore, the pontoon is a closed, hollow space that can provide buoyancy for the floating pipe, reducing the overall weight of the joint pipe; while the through pipe section can increase the weight of the joint pipe when it is installed.

[0009] Preferably, the large-diameter bottom pipe is a hollow through pipe, and a bottom valve is hinged to the other end of the large-diameter bottom pipe.

[0010] Preferably, the connector with different diameters is a hollow funnel-shaped tubular structure. The large-diameter end is connected to a large-diameter insert rod that is inserted into a large-diameter slot at the end of the large-diameter pipe section, and the small-diameter end is connected to a small-diameter slot that is inserted into a small-diameter insert rod at the end of the small-diameter pipe section.

[0011] Preferably, the outer surfaces of the small-diameter connector pipe, the large-diameter connector pipe, the large-diameter bottom pipe, and the small-diameter and large-diameter connectors are all provided with multiple support holes.

[0012] Preferably, seamless steel pipes are connected inside the small-diameter joint pipe, the large-diameter joint pipe, and the small-diameter and large-diameter connectors. The seamless steel pipes include grouting pipes, and multiple tilt sensors are connected to the surface of the grouting pipes.

[0013] Preferably, the small-diameter slot and the large-diameter slot have through pin holes on both sides, and the small-diameter rod and the large-diameter rod have through pin holes on their surfaces. After the slot and the rod are inserted, they are fixed by passing a pin through the pin hole.

[0014] Preferably, the pin includes a rotating shaft that passes through a pin hole and rotates in conjunction with the inner wall of the pin hole; through holes are provided at both ends of the rotating shaft, and steel pins are inserted into the through holes, with limit plates threaded to both ends of the steel pins.

[0015] Preferably, a construction method for a reducing joint of an ultra-deep seepage barrier wall joint pipe joint includes the following steps:

[0016] S1, the orifice is arranged with a hydraulic pipe pulling machine, the hydraulic pipe pulling machine comprises a jacking platform, a hydraulic jacking device and a temporary resting base; a steel wire rope is suspended by a car crane and connected with a large-diameter insertion slot of a large-diameter base pipe through a hoisting tool, the large-diameter base pipe is vertically placed, then the large-diameter base pipe is lowered to the orifice by the hydraulic pipe pulling machine, when reaching a predetermined position, a resting pole is used to rest a large-diameter joint pipe segment on the hydraulic pipe pulling machine, and a next large-diameter joint pipe is hoisted and connected with the large-diameter insertion slot of the base pipe, a grouting pipe and an inclination sensor inside the pipe segment are connected, and a pin shaft is used for fixing; the two large-diameter joint pipes are hoisted and connected, the resting pole is removed, the two large-diameter joint pipes are lowered to form a large-diameter joint pipe segment, when reaching a predetermined position, the next large-diameter joint pipe is rested on the hydraulic pipe pulling machine by the resting pole, the subsequent large-diameter joint pipe is hoisted, the above steps are repeated until all the large-diameter joint pipes are lowered to the hole; the resting pole is inserted into the resting hole in a plug-in manner;

[0017] S2, a steel wire rope is suspended by a car crane and connected with a small-diameter insertion slot of a large-small-diameter connector through a hoisting tool, the large-diameter joint pipe is hoisted to the orifice, a large-diameter insertion rod of the large-small-diameter connector is connected with a large-diameter insertion slot of the large-diameter joint pipe, a grouting pipe and an inclination sensor are connected, and a pin shaft is used for fixing; the large-small-diameter connector and the large-diameter joint pipe are hoisted and connected, the resting pole is removed, the connected pipe segment is lowered, when reaching a predetermined position, the next small-diameter joint pipe is rested on the hydraulic pipe pulling machine by the resting pole;

[0018] S3, a steel wire rope is suspended by a car crane and connected with a small-diameter insertion slot of a small-diameter joint pipe through a hoisting tool, the small-diameter joint pipe is vertically placed, then a small-diameter insertion rod of the small-diameter joint pipe is connected with a small-diameter insertion slot of the large-small-diameter connector, a grouting pipe and an inclination sensor are connected, and a pin shaft is used for fixing; the pipe segment is hoisted and connected, the resting pole is removed, the connected pipe segment is lowered, when reaching a predetermined position, the next small-diameter joint pipe is rested on the hydraulic pipe pulling machine by the resting pole, the subsequent small-diameter joint pipe is hoisted until all the small-diameter joint pipes are lowered to the hole;

[0019] S4, when the concrete is poured to a predetermined height, the joint pipe segment is pulled up by the hydraulic pipe pulling machine:

[0020] First, the joint pipe section is placed on the lifting platform of the hydraulic pipe pulling machine by the resting bar, grouting is injected from the grouting pipe in the joint pipe section through the ground to ensure that the pipe bottom has no negative pressure, and the hydraulic lifting device is started to lift the joint pipe 1-2 m. Then, the temporary resting plate is inserted at the temporary resting base to temporarily fix the joint pipe section, and the resting bar is pulled out. After the lifting platform is lowered to the predetermined position, the resting bar is inserted into the second resting hole of the joint pipe, and the temporary resting plate is pulled out. The hydraulic lifting device is started again to lift the joint pipe 1-2 m, and the above process is repeated until each joint pipe is lifted out and the pin shaft connected with the joint pipe is pulled out. Then, each lifted joint pipe is lifted by the automobile crane.

[0021] Further, the lifting tool is composed of two steel wires and an I-shaped steel frame; wherein the automobile crane is used to suspend the steel wires to connect with the joint pipe through the I-shaped steel frame of the lifting tool.

[0022] Further, the resting bar body is composed of a high-strength steel structure and matched with the resting hole reserved in the joint pipe to rest the joint pipe on the pipe pulling machine.

[0023] Further, the temporary resting plate is made of high-strength steel and matched with the resting hole reserved in the joint pipe to temporarily rest the joint pipe on the temporary resting base of the pipe pulling machine.

[0024] The variable-diameter joint of the joint pipe joint of the ultra-deep anti-seepage wall and the construction method have the following beneficial effects:

[0025] The resting holes on each joint pipe can be used as temporary resting holes when the joint pipe is placed, as lifting holes when the joint pipe is lifted, and can effectively reduce the self-weight of the joint pipe; the large-diameter joint pipe is mainly used for pouring the ultra-deep anti-seepage wall, and the small-diameter joint pipe is used as a lifting pipe and connected through the variable-diameter joint, which reduces the diameter of the upper joint pipe, effectively reduces the weight and friction in the lifting process, reduces the risk of pipe casting, and saves the construction cost; the negative pressure at the bottom of the pipe pulling machine can be avoided by actively grouting from the hole to the hole bottom, thereby reducing the difficulty of pipe pulling. BRIEF DESCRIPTION OF DRAWINGS

[0026] The application will be further described below in combination with the drawings and examples:

[0027] Figure 1 FIG. 1 is a schematic diagram of the overall structure of the variable-diameter joint pipe device of the application;

[0028] Figure 2 FIG. 2 is a schematic diagram of the structure of the small-diameter joint pipe device of the application;

[0029] Figure 3 FIG. 3 is a schematic diagram of the structure of the large-diameter joint pipe device of the application;

[0030] Figure 4 Structure diagram of the large-diameter joint pipe bottom pipe device of the present application;

[0031] Figure 5 Structure diagram of the large-diameter joint pipe bottom pipe device of the present application;

[0032] Figure 6 Structure diagram of the large-diameter joint pipe bottom pipe device of the present application;

[0033] Figure 7 Structure diagram of the large-diameter joint pipe bottom pipe device of the present application;

[0034] Figure 8 Structure diagram of the large-diameter joint pipe bottom pipe device of the present application;

[0035] Figure 9 Structure diagram of the large-diameter joint pipe bottom pipe device of the present application;

[0036] Figure 10 Structure diagram of the large-diameter joint pipe bottom pipe device of the present application;

[0037] Figure 11 Structure diagram of the large-diameter joint pipe bottom pipe device of the present application;

[0038] In the figure: small-diameter joint pipe 1, small-diameter insertion slot 11, small-diameter insertion rod 12, resting hole 13, large-diameter joint pipe 2, large-diameter insertion rod 22, large-diameter bottom pipe 3, large-diameter insertion slot 31, bottom valve 32, large-small-diameter joint 4, hydraulic pipe pulling machine 5, jacking platform 51, hydraulic jacking device 52, temporary resting base 53, seamless steel pipe 6, grouting pipe 61, inclination sensor 62, hoisting tooling 7, steel wire rope 71, I-shaped steel frame 72, resting yoke 8, pin shaft 9, rotating shaft 91, steel pin rod 92, limiting plate 93, temporary resting plate 10. DETAILED DESCRIPTION

[0039] Example 1:

[0040] As Figures 1-11 In the figure: small-diameter joint pipe 1, small-diameter insertion slot 11, small-diameter insertion rod 12, resting hole 13, large-diameter joint pipe 2, large-diameter insertion rod 22, large-diameter bottom pipe 3, large-diameter insertion slot 31, bottom valve 32, large-small-diameter joint 4, hydraulic pipe pulling machine 5, jacking platform 51, hydraulic jacking device 52, temporary resting base 53, seamless steel pipe 6, grouting pipe 61, inclination sensor 62, hoisting tooling 7, steel wire rope 71, I-shaped steel frame 72, resting yoke 8, pin shaft 9, rotating shaft 91, steel pin rod 92, limiting plate 93, temporary resting plate 10.

[0041] Preferably, the small-diameter joint pipe 1 is a hollow float pipe, and a plurality of hollow float boxes are arranged inside the float pipe; one end of the small-diameter joint pipe 1 is connected with a small-diameter slot 11, and the other end is connected with a small-diameter insertion rod 12 which is inserted into the small-diameter slot 11 of the adjacent small-diameter joint pipe 1.

[0042] Preferably, the large-diameter joint pipe 2 comprises a hollow float pipe section and a hollow pipe section; and a plurality of hollow float boxes are arranged inside the float pipe section.

[0043] Further, the float box is a closed hollow space, and the float box can provide buoyancy for the float pipe and reduce the self-weight of the joint pipe as a whole; and the pipe section can increase the self-weight of the joint pipe when the joint pipe is arranged below.

[0044] Preferably, the large-diameter bottom pipe 3 is a hollow pipe, and a bottom valve 32 is hingedly connected to the other end of the large-diameter bottom pipe 3.

[0045] Preferably, the large-diameter and small-diameter connecting head 4 is a hollow funnel-shaped pipe structure, a large-diameter insertion rod 22 is connected to one end of the large-diameter and small-diameter connecting head 4 and is inserted into a large-diameter slot 31 at the end of the large-diameter pipe section, and a small-diameter insertion rod 12 is connected to one end of the small-diameter and large-diameter connecting head 4 and is inserted into a small-diameter slot 11 at the end of the small-diameter pipe section.

[0046] Preferably, a plurality of resting holes 13 are arranged on the outer surfaces of the small-diameter joint pipe 1, the large-diameter joint pipe 2, the large-diameter bottom pipe 3 and the large-diameter and small-diameter connecting head 4.

[0047] Preferably, a seamless steel pipe 6 is connected inside the small-diameter joint pipe 1, the large-diameter joint pipe 2 and the large-diameter and small-diameter connecting head 4, and the seamless steel pipe 6 comprises a grouting pipe 61, and a plurality of inclination sensors 62 are connected to the surface of the grouting pipe 61.

[0048] Preferably, pin holes are arranged on both sides of the small-diameter slot 11 and the large-diameter slot 31, and pin holes are arranged on the surface of the small-diameter insertion rod 12 and the large-diameter insertion rod 22; after the slot and the insertion rod are inserted, the pin holes are fixed by a pin shaft 9.

[0049] Preferably, the pin shaft 9 comprises a rotating shaft 91 which is rotatably connected to the inner wall of the pin hole; through holes are arranged on both ends of the rotating shaft 91, a steel pin 92 is inserted into the through hole, and limit plates 93 are threadedly connected to both ends of the steel pin 92.

[0050] Embodiment two:

[0051] Preferably, a construction method of a variable-diameter joint of a joint pipe of an ultra-deep anti-seepage wall is provided, and the method comprises the following steps:

[0052] S1, the orifice is arranged hydraulic pipe pulling machine 5, hydraulic pipe pulling machine 5 includes jacking platform 51, hydraulic jacking device 52 and temporary resting base 53;Using the automobile hoist suspends the steel wire rope 71 through the hoisting tool 7 and is connected with the large-diameter slot 31 of the large-diameter bottom pipe 3, after the large-diameter bottom pipe 3 is vertical, is placed to the orifice through hydraulic pipe pulling machine 5, to the predetermined position, using the resting pole 8 is placed on the hydraulic pipe pulling machine 5 with the large-diameter joint pipe 2 section, and the large-diameter joint pipe 2 is hoisted in the same way, the large-diameter joint pipe of this section is connected with the large-diameter slot 31 of the upper section bottom pipe, the grouting pipe 61 and the inclination sensor 62 inside the pipe section are connected, and the pin shaft 9 is fixed;Hoist the two large-diameter joint pipes 2 that are connected, remove the resting pole 8, lower the large-diameter joint pipe 2 section that the two large-diameter joint pipes 2 are formed, to the predetermined position, using the resting pole 8 is placed on the hydraulic pipe pulling machine 5 with the next large-diameter joint pipe 2, hoist the subsequent large-diameter joint pipe 2, repeat the above steps to install, until all large-diameter joint pipes 2 are lowered to the hole;Resting pole 8 and resting hole 13 are inserted into each other;

[0053] S2, using the automobile hoist suspends the steel wire rope 71 through the hoisting tool 7 and is connected with the small-diameter slot 11 of the large-small-diameter connector 4, is hoisted to the orifice of the large-diameter joint pipe 2, the large-diameter joint pipe 2 of the large-small-diameter connector 4 is connected with the large-diameter slot 31, while connecting the grouting pipe 61 and the inclination sensor 62, and using the pin shaft 9 is fixed;Hoist the large-small-diameter connector 4 and the large-diameter joint pipe 2 that are connected, remove the resting pole 8, lower the connected pipe section, to the predetermined position, using the resting pole 8 is placed on the hydraulic pipe pulling machine 5 with the next small-diameter joint pipe 1;

[0054] S3, using the automobile hoist suspends the steel wire rope 71 through the hoisting tool 7 and is connected with the small-diameter slot 11 of the small-diameter joint pipe 1, after the small-diameter joint pipe 1 is vertical, the small-diameter joint pipe 1 is connected with the small-diameter slot 11 of the large-small-diameter connector 4, while connecting the grouting pipe 61 and the inclination sensor 62, and using the pin shaft 9 is fixed;Hoist the pipe section that is connected, remove the resting pole 8, lower the pipe section that is connected, to the predetermined position, using the resting pole 8 is placed on the hydraulic pipe pulling machine 5 with the next small-diameter joint pipe 1, hoist the subsequent small-diameter joint pipe 1 to all small-diameter joint pipes 1 are lowered to the hole;

[0055] S4, when the concrete is poured to 50m, the joint pipe section is pulled up using the hydraulic pipe pulling machine 5:

[0056] First, the joint pipe section is placed on the lifting platform 51 of the hydraulic pipe pulling machine 5 by the resting bar 8, grouting is injected from the ground through the grouting pipe 61 in the joint pipe section to ensure that the pipe bottom has no negative pressure, and the hydraulic lifting device 52 is started to lift the joint pipe 1-2 m. Then, the temporary resting plate 10 is inserted at the temporary resting base 53 to temporarily fix the joint pipe section, and the resting bar 8 is pulled out. After the lifting platform 51 is lowered to the predetermined position, the resting bar 8 is inserted into the second resting hole 13 of the joint pipe, and the temporary resting plate 10 is pulled out. The hydraulic lifting device 52 is started again to lift the joint pipe 1-2 m, and the above process is repeated until each joint pipe is lifted out and the pin shaft 9 connected to the joint pipe is pulled out. Then, each lifted joint pipe is lifted by the automobile crane to the remaining area.

[0057] Further, the lifting tool 7 is composed of two steel wire ropes 71 and an I-shaped steel frame 72. The automobile crane suspends the steel wire rope 71 to connect the I-shaped steel frame 72 of the lifting tool 7 with the insertion slot end of the joint pipe.

[0058] Further, the main body of the resting bar 8 is composed of a high-strength steel structure, which is matched with the resting hole 13 reserved in the joint pipe to rest the joint pipe on the pipe pulling machine.

[0059] Further, the temporary resting plate 10 is made of high-strength steel, which is matched with the resting hole 13 reserved in the joint pipe to temporarily rest the joint pipe on the temporary resting base 53 of the pipe pulling machine.

Claims

1. A construction method for a reducing joint of an ultra-deep seepage-proof wall joint pipe joint, characterized in that, Includes a large-diameter base pipe (3), one end of which is connected to a large-diameter insert rod (22) at one end of a large-diameter connector pipe (2) via a large-diameter slot (31); the other end of the large-diameter connector pipe (2) is also connected to a large-diameter slot (31), which is connected to an adjacent large-diameter connector pipe (2), and multiple sections of large-diameter connector pipe (2) form a large-diameter pipe section; the end of the large-diameter pipe section is connected to a small-diameter connector (4), and the other end of the small-diameter connector (4) is connected to a small-diameter pipe section, which is composed of multiple sections of small-diameter connector pipe (1); inside the small-diameter connector pipe (1), the large-diameter connector pipe (2) and the small-diameter connector (4) All are connected to seamless steel pipes (6), including grouting pipes (61), and multiple tilt sensors (62) are connected to the surface of grouting pipes (61); one end of the small diameter joint pipe (1) is connected to a small diameter slot (11), and the other end is connected to a small diameter rod (12) which is inserted into the small diameter slot (11) of the adjacent small diameter joint pipe (1); the large and small diameter connectors (4) are hollow funnel-shaped tubular structures, one end of the large diameter is connected to a large diameter rod (22) which is inserted into the large diameter slot (31) at the end of the large diameter pipe section, and one end of the small diameter is connected to a small diameter slot (11) which is inserted into the small diameter rod (12) at the end of the small diameter pipe section; The construction method for the reducing joint of the ultra-deep seepage barrier wall joint pipe joint mentioned above includes the following steps: S1, a hydraulic pipe puller (5) is installed at the orifice. The hydraulic pipe puller (5) includes a lifting platform (51), a hydraulic lifting device (52), and a temporary support base (53). A truck crane is used to suspend a wire rope and connect it to the large-diameter slot (31) of the large-diameter bottom pipe through a lifting fixture (7). After the large-diameter bottom pipe (3) is verticalized, it is lowered to the orifice by the hydraulic pipe puller (5). After reaching the predetermined position, the large-diameter joint pipe section is placed on the hydraulic pipe puller (5) using a support beam (8). Similarly, the next section of the large-diameter joint pipe (2) is lifted, and the large-diameter insertion rod (22) of this section of the joint pipe is connected to the large-diameter slot of the previous section of the bottom pipe. (31) Connect the grouting pipe (61) and tilt sensor (62) inside the pipe section, and fix them with pin (9); lift the two large-diameter joint pipes (2) that have been connected, remove the support beam (8), lower the large-diameter joint pipe section composed of the two large-diameter joint pipes (2) to the predetermined position, and use the support beam (8) to place the next large-diameter joint pipe (2) on the hydraulic pipe pulling machine (5), lift the subsequent large-diameter joint pipe (2), and repeat the above steps to install until all large-diameter joint pipes (2) are lowered into the hole; the support beam (8) and the support hole (13) are inserted and matched. S2, using a truck crane to suspend the wire rope and connect it to the small diameter slot (11) of the large and small diameter connectors through the hoisting tool (7), hoisting it to the large diameter connector pipe (2) at the orifice, connecting the large diameter insertion rod (22) of the large and small diameter connector (4) with the large diameter slot (31) of the large diameter connector pipe (2), and connecting the grouting pipe (61) and the tilt sensor (62) at the same time, and fixing it with the pin (9); hoisting the large and small diameter connectors (4) and the large diameter connector pipe (2) after the connection is completed, removing the support beam (8), lowering the connected pipe section to the predetermined position, and using the support beam (8) to place the next small diameter connector pipe (1) on the hydraulic pipe pulling machine (5); S3, using a truck crane to suspend the wire rope and connect it to the small diameter slot (11) of the small diameter joint pipe through the hoisting tool (7). After the small diameter joint pipe (1) is verticalized, the small diameter insertion rod (12) of the small diameter joint pipe is connected to the small diameter slot (11) of the large and small diameter connector (4). At the same time, the grouting pipe (61) and the tilt sensor (62) are connected and fixed with the pin (9). The pipe section that has been connected is lifted, the support beam (8) is removed, and the pipe section that has been connected is lowered to the predetermined position. The support beam (8) is used to place the next small diameter joint pipe (1) on the hydraulic pipe pulling machine (5). The subsequent small diameter joint pipes (1) are lifted until all small diameter joint pipes (1) are lowered into the hole. S4, When the concrete is poured to the predetermined height, use a hydraulic pipe puller (5) to pull out the joint pipe section: First, the joint pipe section is placed on the lifting platform (51) of the hydraulic pipe pulling machine (5) using a support beam (8). Grout is injected from the ground through the grouting pipe (61) inside the joint pipe section to ensure that there is no negative pressure at the bottom of the pipe. At the same time, the hydraulic lifting device (52) is started to lift the joint pipe 1-2m. Then, a temporary support plate (10) is inserted at the temporary support base (53) to temporarily fix the joint pipe section. Then, the support beam (8) is pulled out, the lifting platform (51) is lowered to the predetermined position, the support beam (8) is inserted into the second support hole (13) of the joint pipe, and the temporary support plate (10) is pulled out. The hydraulic lifting device (52) is started again to lift the joint pipe 1-2m. The above process is repeated until each joint pipe section is lifted out. After the pin (9) connecting the joint pipe is pulled out, each joint pipe section that has been lifted out is lifted to the other area by a truck crane.

2. The construction method of the reducing joint of the ultra-deep seepage barrier wall joint pipe joint according to claim 1, characterized in that, The small-diameter connector pipe (1) is a hollow floating pipe with multiple hollow floating boxes inside.

3. The construction method of the reducing joint of the ultra-deep seepage barrier wall joint pipe joint according to claim 1, characterized in that, The large-diameter connector pipe (2) includes a hollow floating pipe section and a hollow through pipe section; the floating pipe section is equipped with multiple hollow floating boxes.

4. The construction method of the reducing joint of the ultra-deep seepage barrier wall joint pipe joint according to claim 1, characterized in that, The large-diameter bottom pipe (3) is a hollow through pipe; the other end of the large-diameter bottom pipe (3) is hinged to a bottom valve (32).

5. The construction method of a reducing joint for an ultra-deep seepage barrier wall as described in claim 1, characterized in that, Multiple placement holes (13) are provided on the outer surfaces of the small-diameter connector pipe (1), the large-diameter connector pipe (2), the large-diameter bottom pipe (3), and the small-diameter connector (4).

6. The construction method of the reducing joint of the ultra-deep seepage barrier wall joint pipe joint according to claim 1, characterized in that, The small-diameter slot (11) and the large-diameter slot (31) have through pin holes on both sides. The small-diameter rod (12) and the large-diameter rod (22) have through pin holes on their surfaces. After the slot and the rod are inserted, they are fixed by passing through the pin holes with a pin shaft (9).

7. The construction method of a reducing joint for an ultra-deep seepage barrier wall joint pipe joint according to claim 6, characterized in that, The pin includes a rotating shaft (91), which passes through a pin hole and rotates with the inner wall of the pin hole; the rotating shaft (91) has through holes at both ends, and a steel pin (92) is inserted into the through hole, with a limit plate (93) threaded to both ends of the steel pin (92).

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